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  • 101.
    Gustafsson, Johan
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Kanefur, Johan
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Influens av sensorteknik inom styrketräning2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vi vill börja med att tacka vår handledare Dena Ala-Hussain för all hjälp och guidning vi har fått genom arbetets gång.

    Vi vill även tacka STC Kungälv Rollsbo och alla personer som medverkade i testandet av sensorsystemet.

    Fördelningen av arbetsuppgifter har varit jämn och båda har deltagit i alla moment.

  • 102.
    Habibovic, Sejla
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Svensson, Per Real
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Friköp av bostadsrättsföreningar och överföring av fastighetstillbehör: Vad avgör om anläggningslagen 12 a § tillämpas?2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The interaction of properties exist in several different forms. A joint facility forms such a form of cooperation, which is set up to accommodate purposes of constant importance for several properties. The purposes for which a joint facility is set up are widely different and often consist of facilities that make up a property, including property fixtures. With a joint facility follows the right to space for the participating properties to manage the facility appropriately.   However, ownership of the participating properties will not automatically change when setting up a joint facility. Before 2002, property and its fixtures were seen as an ownership unit, which could only be separated by the physical removal of the fixture from the property. Regulations that allowed the transfer of property fixtures and property rights to the facility were introduced in the Real Property Formation Act (FBL) and the Joint Facilities Act (AL). Even regulation on the possibility of release of property fixtures was introduced simultaneously in the Utility Easements Act (LL). 

     In the government bill Transfer of property fixtures 2000/01: 138, the introduction of the legislative changes was motivated by the fact that a number of uncertainties could be avoided regarding the property fixtures. These consisted of uncertainties about maintenance responsibility, liability to subscribe for insurance, assignment of use rights, the right to rebuild and expand, as well as the use of the mortgaging.  Owning your own property has always been important not only for the individual but also for the development of society. The ownership creates incentives to spend time, energy and money on your property, which in turn generates a higher property value. Nevertheless, tenant-ownership is a common housing form in Sweden. However, it is possible to create new individual properties through liquidation of the tenant-ownership and the subdivision of the property. However, for those spaces and facilities that has previously been common, the need remains for common use. In practice, only the property boundaries and ownership have changed, not the physical conditions. Establishment of a joint facility meets this need. In order to also transfer ownership of the participating properties there is the possibility of applying AL 12 a §.   This study investigates what has been crucial for whether AL 12 a § has been applied and which property fixtures are usually transferred. Responsibility for joint facilities is a key concept. The study examines how responsibility for the insurance issue is affected if transfer under AL 12 a § happens or not. In order to answer the question of liability, it was important to try to understand what separates the right to space from ownership.

    The result shows that transfer of property fixtures under AL 12 a § occurred in 17 of the 45 gathered acts of execution. The property fixtures that were usually transferred were mainly VA-pipelines but also watercourses, outdoor lighting, media installations in the form of cable TV, broadband, fiber and central antenna, as well as driving areas such as road and exit. The decisive factor in applying AL 12 a § is the attitude of the cadastral surveyor, and knowledge of the regulation.  Regarding the liability of the insurance issue, the joint property unit of the facility is considered to be of greater significance than if the transfer has taken place or not. The right to space differs slightly from ownership in this context, as the insurance terms are based on the responsibility for property fixtures and not the property rights themselves. The transfer of the property fixtures therefore lacks practical significance. Associations management is considered more appropriate in this context than part-owner management. The choice of management form is more important, the more expensive the property fixtures are and the more useful it is for the properties participating in the joint venture.

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  • 103.
    Hagstedt, Sandra
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    VA-avtal: Rättsförhållandet mellan huvudman och avtalskunder inom och utom verksamhetsområdet2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The law of public water services is the Swedish law governing the local authority´s duty to provide water services when needed in a larger context. The local authority will define an operating area in which water services are to be arranged. When a shared facility for water and sewer are to be connected to the public facility, a contract will be needed so the shared property association facility should take place as subscriber. This also applies to shared facilities outside the operating area to be allowed to connect to the public water and sewage plant.

    Various legislation is the basis for these contracts, depending on whether the properties are located within or outside the operating area. Because of these circumstances, there is interest in studying the issue further.

    The study aims to describe the current contractual situation between the water and sewer principal and contract customers in three municipalities. The questions to be answered are; which law are appropriate when the principals applies agreements with properties outside the operating area and how do they handle the facility costs? Does the principal make any technical requirements for installations to be connected and if so what do they intend? Do they use contract templates and if then, what they contain?

    The method adopted to meet the purpose of the study is mainly qualitative. Interviews were conducted with people who are responsible for the subscribers in the three municipalities. Subsequently, the municipal contract templates which are used in this type of agreements reviewed to highlight any ambiguities. A legal method has been used to study the legal text, preparatory work and court cases.

    The result shows that all municipalities apply the law of public water services even for properties outside the operating area. There are differences, between municipalities, in how they have chosen to take out the construction costs. None of the principals have technical requirements for the installations they are connecting. All municipalities use contract templates for contracts, but none have procedures in place to review them, which resulted in some ambiguity. In summary, none of the municipalities are experiencing any major problems with the contract situation and they feel safe that their agreements do not contain any inaccuracies

  • 104.
    Hedlund, Andreas
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Abrahamsson, Carl
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Rekonstruktion, utveckling och design av ett befintligt system2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Systemutveckling går framåt i ett väldigt raskt tempo, inte minst webbutveckling. På marknaden idag finns det ett brett utbud av olika system. Många system med väldigt moderna och användarvänliga gränssnitt, men också exempel på mindre bra varianter. Många system är lite äldre och har fungerat okej en längre tid. Men i takt med att det kommer nyare och enklare system som kan utföra samma uppgifter kommer kanske behovet av att byta ut systemen. Ibland byter man ut hela systemet, i vissa lägen räcker det med en uppfräschning. Denna rapport kommer att behandla uppbyggnaden och utvecklingen av ett helt nytt användargränssnitt. Systemet som gränssnittet implementeras i existerar sedan tidigare och ägs av företaget Empir. Detta gränssnitt ersätter det redan befintliga gränssnittet. En grundlig analys gjordes för att få en god förståelse för hur systemet användes och fungerade. Hela designen gjordes om från grunden, hela strukturen byttes ut, nytt menysystem, nya listor och nya vyer togs fram. Stöd för mobila enheter implementerades. Det nya användargränssnittet utvecklades med hjälp av erkännda ramverk samt de senaste inom webbteknik. Examensarbetet behandlar i delen resultat en jämförelse mellan de båda systemen, detta för att få en klar bild om de mål som sattes är uppnådda. Jämförelse är nästan uteslutande visuell. Rapporten kommer att rikta sig mot design delen av arbetet och kommer inte behandla någon avancerad kod. Därför kommer även en läsare utan programmeringsbakgrund att kunna ta del av innehållet.

  • 105.
    Hedlund, Robin
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Öberg, Andreas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Redundansmetoders påverkan på IP-telefoni under länkavbrott i ett datornätverk2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This comparison studies fast redundancy in a network by establishing a link failure at the primary route while a conversation is held over a VoIP call. We are focusing on packet loss and convergence time when comparing the following technologies: Open Shortest Path First (OSPF), Enhanced Interior Gateway Routing Protocol (EIGRP), per VLAN Rapid Spanning Tree (PVRST +) as well as Flex Links, aggregated links and Floating static routes.

    The purpose of the study is to compare how much impact these protocols have in a VoIP call when there is a change in the topology. All the devices in the topology are directly connected to each other so that the results of the comparison are not affected by the time it takes for the protocols to understand that something is wrong.

    To create a VoIP call, we use the communication tool Mumble with the audio codec Opus that is configured to send 50 UDP packets per second. We are also having a conversation over the VoIP call to get a user perspective of the disruption.

    With the exception of OSPF, all technologies converge faster than 150 msec and lose a maximum of three packets. OSPF takes more time to find the redundant path and after approximately five seconds the call will be resumed.

    We do not hear any disruption when having a normal conversation if we lose three or less packets during the link failure. By this conclusion, all techniques, except OSPF, are fast enough to not create any noticeable disruption for the end users when a failure occurs on the primary path.

  • 106.
    Hedman, Christoffer
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Möller, Linus
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    SQL vs NoSQL: En prestanda jämförelse2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this paper we compare the performance of a NoSQL database and a MySQL database. The execution time is measured for a variety of different operations, such as read, write and update. We will also perform tests on a denormalized MongoDB database when the tests uses more than one collection. A small amount of structured data is used to model a fictive taxi company. The tests are written in Python and are performed in a virtual environment. The paper goes through the history behind relational databases and NoSQL types, and also covers both MySQL and MongoDB, which is the database managers used in these tests. They are chosen because they are the most popular on the market. Results show that MongoDB is quicker than MySQL when the operations are performed on a single collection/table.

  • 107.
    Hedström, Kevin
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Utvärdering av nätverksdesign2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This thesis intent is to show various design methods used in building a network. Show differences that occur with replacing layer 2 devices to layer 3 devices. The difficulty in designing a network is to provide enough redundancy, number of access ports, enough throughput and good load-balancing. Scalability and troubleshooting should also be considered. Cisco's Network model will therefore be displayed as a well-used standard in network design.

    Reasons why this design model is used is given. Other design models suitable for various sizes of networks is displayed. An evaluation to the improved network of the classic Cisco Network Model is done, where the layer 2 devices is swapped out for layer 3 devices. The benefit of this change is mainly the removal of the spanning-tree usage.

  • 108.
    Heikkinen, Marko
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Salihu, Shpetim
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Projektering och beredning av vädersäkrat nät i Häljebo2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a preparation work to protect a small part of Vattenfall's electricity distribution networks from weather changes in the area Häljebo located in Grästorp municipality.The preparation is performed by the consulting company Nordisk ElkraftTeknik AB, NEKTAB commissioned by Vattenfall Distribution AB that has decided that the existing overhead lines should be placed in the ground to secure electricity network for weather changes. Today's pole stations and overhead lines should be removed and replaced by three new ground stations and 5.7 km of low- and high voltage cables in the ground. 17 customers are affected by this change. Preparation means to manage contacts with authorities and property owners and also explore the field and determine the appropriate trench. Basis for prepared work needs permission to various authorities, for example Administrative Board, the Swedish Transport Administration and the Environmental and Building Committee. The preparer signs agreements with property owners regarding land ownership issues. Finally, all documentation compiled in a cover used by the entrepreneur to perform work on the field. Preparation work was carried out by Marko Heikkinen and Shpetim Salihu at consulting firm Nordisk ElkraftTeknik AB, NEKTAB.

  • 109.
    Hendén, Eva
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Johansson, Anders
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Linbana i tätbebyggt område: Ersättning och värdering för markåtkomst och störningar2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A gondola lift as a means of public transportation system is a new phenomenon in Sweden. In view of the urbanization and society’s ambition to accommodate the urgent need of housing through a concentration of the city, a gondola lift stands out as a suitable compliment for the existing infrastructure. Above all because of the small "footprint" the structure makes on the environment. As a transportation system, gondola lifts are energy efficient, environmentally friendly and provides accessibility where other transportation systems are too difficult or too expensive to build. The study has looked at questions of compensation for the property encroachments and environmental disturbances a gondola lift might cause. The study gives further details about the general principles of compensation and valuation regarding this area, and also how these principles can be applied to gondola lifts in urban areas.

    The study has been done using a legal methodology, which involves a deeper understanding of the law, government bills and doctrine. Guiding- and precedent court cases has been analyzed in order to make an assessment about the influence of the environmental disturbances. Interviews has been done with a cadastral surveyor at the Gothenburg municipality office and with a technical adviser at the environmental court of appeal, in order to broaden the perspectives of the interpretations made in the study.

    The study infers that the compensation rules of encroachment in the law of expropriation should be applied, no matter which law is used to expropriate for the gondola lift. Decisive when determining the compensation is the change in market value caused by the encroachment. It´s harder to estimate the effect on market value caused by encroachment of the cable only, than for encroachment of the station buildings and pillars. The difficulty lies in the estimation of the change in market value when the expropriated property is "hollowed" in favor of the gondola cable. A gondola lift can be built very high, which means that a property in those cases aren´t restricted in any large extent regarding the use of the property directly below the cable. Although, assessments must be done for each individual case. Regarding the different disturbances, problems occur around the way they are perceived and how the overall effect of different disturbances should be assessed. Because gondola lifts as a public transportation is so new, there hasn´t been any legal cases tried about its encroachment or disturbances. In order to make an assessment about disturbances, a court case analysis has been done using cases about activities which disturbances are comparably similar to the once caused by a gondola lift. The result of the study shows that this assessment is hard to do. A necessary proceeding might be to try out the gondola lift in a detailed zoning plan. The gondola lift is then tested as a whole, including the effects of disturbances and encroachment. The framework of a detailed zoning plan also promotes the dialog with the parties concerned as well as with the other citizens.

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  • 110.
    Henriksson, Andreas
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Gustafsson, Andreas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Bygglovsbefriade ekonomibyggnader: Regelns innebörd och kommunernas handläggning2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Building and city planning is regulated through the Planning and Building Act (PBL). Most buildings require a building permit, these permits are handled by the building committees in each municipality. Recent changes in the Planning and Building Act have, however, given municipalities the possibility to have a shared building committee, which is used to a lesser extent. There are exceptions to the general requirement for a building permit. One of these exceptions, found in 9 kap. 3 § planning and building act, is the one for buildings used for agriculture, forestry or other similar enterprises. This paragraph allows property owners to raise buildings without applying for a building permit or reporting the construction to the building committee. The exception to the rule is not defined to any greater extent in Planning and Building Act. The law does, however, specify that the building needs to be directly connected to agriculture, forestry or other similar enterprises to be exempt from the general need of a building permit. The lack of a closer definition in today's law has forced courts to study older reports and propositions rendered by the Swedish government. The report SOU 1945:15 and the proposition (prop.) 1947:131 have been widely referred to by courts in their attempts to determine whether a building requires a building permit or not according to this exception.These early writings specify that the building has to be needed for the enterprise in question. Buildings such as dairy buildings, slaughterhouses, canning factories, sawmills or greenhouses should not fall under this category according to these writings, because they are to be seen as independent companies with respect to the size of the activity and other circumstances. Because of the lack of a closer definition, determining whether a building falls under this category or not has been an issue. A plethora of court cases exist on the subject with more coming relatively often. The purpose of this study is to form a picture of the exception from current and historical law. It further attempts to form a frame in which the judgement takes place by analyzing precedent set by courts of higher authority as well as by looking at court cases of lesser authority. Four important judgement factors have appeared during the study’s analysis of court cases. The standard of the building is of importance. If the standard is too high or too luxurious, the construction might not be categorized within the exception. Another important judgement factor is the kind of activity that is taking place in the building. This activity needs to be directly connected to agriculture, forestry or other similar enterprises to warrant an exception from a building permit. The extent of the activity is also of importance, both in the building and on the property. If the agriculture on the property, for instance, is being performed to a smaller extent, the judgement might be that there is no enterprise on  iv Bygglovsbefriade ekonomibyggnader – Regelns innebörd och kommunernas handläggning  the property to connect the building to, leading to the requirement of a building permit. If the activity in the actual building is being performed to an extent that is considered as being too large, it might be considered an independent activity, which is the fourth judgement factor. If the activity is independent it is not connected to the enterprise on the property, the building does therefore require a building permit. Important to note, however, is that an extensive evaluation where all factors are considered needs to take place in each separate case. With this frame set and in mind, the study looks at municipal cases throughout Sweden in an attempt to compare these to the frame. All 290 of the Swedish municipalities were contacted through mail in an attempt to gather municipal cases related to the exception. The primary focus has been cases where the municipality ordered the property owner to apply for a building permit after the building was constructed, a permit injunction, and cases where the property owner was ordered to correct what they had done wrong, a correction injunction. Some additional cases other than the aforementioned are presented in the study, however, because they relate to the subject. With a response time of one month, twelve of these municipalities have provided the study with cases where orders related to the exception have been issued. 120 responded that they had not issued any orders related to these buildings. 158 municipalities did not answer during this one month response time. In total, however, twenty cases from 15 different municipalities are investigated, orders or no orders.  One conclusion is that municipal orders related to the exception are relatively rare. Reasons for this might be that there are many unrecorded buildings of this type on the countryside, since several of the municipalities contacted through this study have reported that they do not actively search for these kinds of buildings. Instead they rely on a potential neighbour to report the construction to the building committee. Another conclusion is that the way municipalities handle and report these cases vary quite a bit. Some lean heavily on precedent set by courts, while others attempt to judge the building by their own standards.   

  • 111.
    Hermansson, Andreas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Simulation of line fault locator on HVDC Light electrode line2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this bachelor thesis, cable fault locators are studied for use on the overhead electrode lines in the HVDC (High Voltage Direct Current) Light project Caprivi Link. The cable fault locators studied operates with the principle of travelling waves, where a pulse is sent in the tested conductor. The time difference is measured from the injection moment to the reflection is received. If the propagation speed of the pulse is known the distance to the fault can be calculated. This type of unit is typically referred to as a TDR (Time Domain Reflectometer). The study is performed as a computer simulation where a simplified model of a TDR unit is created and applied to an electrode line model by using PSCAD/EMTDC. Staged faults of open circuit and ground fault types are placed at three distances on the electrode line model, different parameters of the TDR units such as pulse width and pulse amplitude along with its connection to the electrode line are then studied and evaluated. The results of the simulations show that it is possible to detect faults of both open circuit and ground fault types with a suitable TDR unit. Ground faults with high resistance occurring at long distances can be hard to detect due to low reflection amplitudes from the injections. This problem can somewhat be resolved with a function that lets the user compare an old trace of a “healthy” line with the new trace. The study shows that most of the faults can be detected and a distance to the fault can be calculated within an accuracy of ± 250 m. The pulse width of the TDR needs to be at least 10 μs, preferable 20 μs to deliver high enough energy to the fault to create a detectable reflection. The pulse amplitude seams to be of less significance in this simulation, although higher pulse amplitude is likely to be more suitable in a real measurement due to the higher energy delivered to the fault. The Hipotronics TDR 1150 is a unit that fulfil these requirements and should therefore be able to work as a line fault locator on the electrode line.

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  • 112.
    Hikmat Al-Saeedi, Ahmed
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Optimering av överkopplingsmotstånd i lindningskopplare2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The development and improvement of technical parts saves not only money but also material consumption. In this thesis laboratory experiments have been carried out to find optimizations for tap changers, which is one of the important components of the transformers. The tap changer's task is to ensure that a stable voltage is maintained in a network with varying load, and make sure the heat generated does not result in an overheating of the system.

    The purpose of the work is to control theresistor's ability to achieve the standard requirements that the temperature in the overload resistance must not exceed a certain value. The tests included an evaluation as to which of the three different resistance positions, horizontal, vertical or standing, that provide the most efficient cooling. Each position is tested with three different electrical currents.

    ABB has previously performed laboratory tests on two of these positions, horizontal and vertical, with a wire diameter of 2.2 millimeters. In this work, the tests were conducted with a thicker wire diameter of 3.2 millimeters to compare with ABB previous tests. In order to make comparisons between the different wire thicknesses, the same energy is used.

    The results of the laboratory work show that the position and the wire diameter is relevant to how effective cooling is achieved. The conclusion is that vertical position gives the most cooling and that a wire diameter of 2.2 millimeters is more suitable than 3.2 millimeters.

  • 113.
    Hilmersson, Mikael
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Ivarsson, Olof
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Prestandamätning av en 10 Gbps-länk med olika paketstorlekar2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    Today’s society requires faster connections which adds greater demands on our networks and it is important to utilize the maximum capacity of our links. This thesis examines how close the theoretical maximum speed it is possible to reach on a 10 Gbps link, depending on the packet size used. To determine this a series of tests was performed on a 10 Gbps link between two Cisco 6504. Packet sizes between 64B and 4 092B were used and compared against a calculated theoretical maximum speed according to the Ethernet standard IEEE 802.3-2015. The results show that it is difficult to achieve the theoretical maximum speed with small packets. When the packet size increases the difference between the test result and the theoretical maximum speed grows smaller and smaller. With a packet size of 4 092B a speed equivalent to 99.96% of the theoretical maximum was achieved.

  • 114.
    Hjalmarsson Nielsen, Theres
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Eriksson, Viktor
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Fastighetsreglering: Köp eller överenskommelse som grundhandling vid överföring av hel fastighet2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I Sverige ombildas fastigheter genom fastighetsreglering. Ett område av eller en hel fastighet kan föras över till en annan fastighet. Bestämmelserna om fastighetsreglering finns i fastighetsbildningslagen och framförallt i kapitel 5. För att överlåta en hel fastighet med hjälp av fastighetsreglering krävs att den frivilligt överlåts, det kan göras med ett köp enligt JB 4 kap eller ett medgivande enligt FBL 5:18. Medgivande lämnas nästintill uteslutande genom att parterna ingår en överenskommelse. Köp och överenskommelse är två grundhandlingar som kan användas för att uppnå samma ändamål, överföring av hel fastighet. Det finns skillnader som medför att valet av grundhandling ger konsekvenser fastighetsrättsligt. I detta examensarbete beskrivs och jämförs skillnaderna och en kvantitativ undersökning har genomförts för att se i vilken utsträckning köp respektive överenskommelse vid frivillig marköverföring av hel fastighet används. Undersökningen syftar också till att se om det finns några mönster och särdrag vad gäller ändamål och erlagd köpeskilling/ersättning beroende på vilken grundhandling som använts i förrättningen. Förrättningsakter i Lantmäteriets databas Arken söktes fram och granskades. Sökkriterierna som användes var att det i förrättningarna skulle ha skett fastighetsreglering där en fastighet överförts i sin helhet och därmed avregistrerats. Undersökningen genomfördes på de förrättningar som registrerats under år 2014 i de 19 kommuner som bildade före detta Älvsborgs län som idag ingår i Västra Götalands län. Inom tidsintervallet och området hade 631 förrättningar med åtgärd fastighetsreglering gjorts varav 86 matchade sökkriterierna. Av de 86 förrättningarna var det 69 som genomfördes med köp och 17 med överenskommelse som grund. Köp var överlägset den vanligaste grundhandlingen och förekom i fyra fall av fem. Flertalet fastighetsregleringar handlade om jord- och skogsbruksfastigheter som överfördes till andra fastigheter med samma ändamål, de fastighetsregleringarna grundades nästintill uteslutande på köp. Vid förrättningar där kommuner och Trafikverket var sakägare sågs en ökad användning av överenskommelser.

  • 115.
    Hjärn, Beatrice
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Lilliehöök, Eva
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Landsbygdsutveckling i strandnära lägen: Tillämpningen av lagstiftningen i Västra Götalandslän2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study is about the new legislation that deals with countryside development in areas that are close to shores (LIS) that introduced in 2009 /2010. The legislation was introduced to stimulate the local and regional development by creating jobs or attractive living environments in areas with good access to beach purview with low development rate. According to earlier reports on the mapping of the shoreline protection laws applicable in Sweden, where there are differences in the application of shore protection legislation both regionally and locally.

    The purpose of the study is to examine how the law is applied in the county of Västra Götaland. Based on a comparison of the county administrative board and municipalities 's arguments and decisions examined, what was found compatible with shoreline protection provisions of the Environmental Code and what is considered to be against them. The purpose of this study is to investigate if the purpose of the legislation is met and if it detected any discrepancies in the application.

    The study was done mainly using a qualitative method, but also a quantitative method was used to make a compilation of various categories of all LIS areas in Västra Götaland.

    The conclusion shows that both the County Board and the municipalities flaws in their reasoning regarding LIS both in plan and decision at a later stage. The conclusion also shows that the purpose of LIS in full compliance in today's application in the county of Västra Götaland. A better base of knowledge for the municipalities and the County Board needs to be developed to provide better guidance on how to apply the LIS.

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  • 116.
    Holm, Erik
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Andersson, Joakim
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Encrypted media streaming over 4G (LTE) with Raspberry Pi2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to explore the possibility of building a more secure and better streaming solution than publically available. The available solutions today are in our opinion mediocre in quality and are often missing older and unknown artists. A prototype will be built and tested in a variety of different scenarios where the prototypes capability will be tested to the fullest. The result is a working streaming solution where good quality and security is a fact. The finished prototype has a few limitations, but overall it's a good working solution.

  • 117.
    Holmberg, Karina
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Sjödahl, Jeanette
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Rättigheter för avloppstunnlar: En studie av möjliga alternativ med fördjupning i ledningsrätt, fokus Trollhättan2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A traditional property ownership extends from the surface both upwards and downwards, as far as it is possible to take advantage of it. Therefore, the consent of property owners is required when a pipe or other device is to be laid. The legal right has to be secured. The aim of the study is to describe the ways in which legal rights to space for sewage tunnels can be secured, as well as to analyze the applicability of the Utility Easement Act. Trollhättan's four mile long system of sewage tunnels is used as an example for the essay. It runs through 400 properties, where the rights to the space are not secured.

    The rights used for sewage tunnels in Sweden are agreement easement and official easement, 3D property and utility easement, according to an inquiry and interviews. Possible options to access land for laying pipes are also the rights of use, but not suitable for tunnels as it is limited in time. For the agreement easement time is unlimited, but as rights of use, it has a weaker legal protection than official rights. Official easements are unlimited in time and they also have a strong protection, but this form of rights cannot be used if the Utility Easements Act is applicable. To form a 3D property, the property formation has to be the most appropriate measure to cater for the purpose, in comparison with other real estate legal solutions.General pipes are included in the utility easement, which should be seen as the natural alternative for sewage tunnels. It is unclear, however, if a sewage tunnel can be regarded as a pipe. If there is a tunnel containing pipes, the tunnel could be indirectly protected by the utility easement. But concerning tunnels containing open sewer, the law is unclear. The disposal of waste water is a vital function, and rights should be able to be formed effectively.However, the study shows that there is uncertainty about what kind of rights should be formed for tunnels. The undefined limit between pipe and tunnel contributes to the uncertainties. To conclude, there is a need for clarification in the law.

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  • 118.
    Hult, Amanda
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Schönberg, Cassandra
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Kommunala friskrivningar: En studie om hur kommunerna hanterar jordabalken 4 kap. 19 d §2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Buying a property is one of the biggest and most important investments in a person´s life. When this kind of purchase is being performed it´s important that the Swedish legislation is being considered and followed correctly by both parties when writing the contract.

    After a property is sold it's not unusual that some disputes and uncertainties rises about who´s responsible for the so called "hidden defects" on the property, which can be found after the purchase has become final. According to Swedish law the seller is responsible for these defects for the following 10 years after the purchase is completed. However there is one way for the seller to avoid this kind of responsibility - by using a disclaimer from these hidden defects. When a trader is selling a property to a consumer, this kind of disclaimers, according to jordabalken (JB) 4 cap. 19 d §, is invalid. According to what the writers can interpret by reading the text of law and the legislative history, JB 4 cap. 19 d § also should be applied in those cases where a municipality is selling a property to a private individual.

    The purpose of this study is to map the municipalities awareness of the existence of the law and how they consider that the law should be handled when selling a property to a private individual. To seek the answers to these questions a combination of a juridical and a qualitative method have been used. During the study a total of 46 contracts from 10 different municipalities have been examined.

    The study came across a total of 46 disclaimers, which a percantage of 52 % according to JB 4 cap 19 d § considers as invalid. The majority of these disclaimers was proved to be designed as one of three alternative ways, where every one of them contained some kind of disclaimer from hidden defects and flaws in the property. The study proves that there is big ignorance and lack of knowledge at the municipalities about how the law in JB 4 cap. 19 d § should be interpreted and how this kind of disclaimer therefore should be treated in the contracts. Also, the study shows that the municipalities doesn't seem to be aware that the same purpose that they want to achieve by using the disclaimer, can be accomplished by a detailed description of the property.

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  • 119.
    Hussain, Dena
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    ICTs and sustainable management in cases of special need children: An early research case study2016In: 2016 IEEE Global Engineering Education Conference (EDUCON), IEEE, 2016, p. 997-1002Conference paper (Refereed)
    Abstract [en]

    As modern information and communication technologies (ICT) offer new possibilities for improving different aspect of healthcare, their implementation is a very relevant and is a fast accelerating process. The objective of this research is to identify the relationship between the use of Information and Communication Technologies for sustainable communication in the healthcare sector and examining the impact of using ICTs tool in a sustainable healthcare environment. This research is motivated by the need to develop better approaches in regards to healthcare services, creating optimized action plans for the development of sustainable processes in the healthcare sector in relation to process involving caretakers of disabled children in Sweden.

  • 120.
    Hussain, Dena
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Gustavsson Christiernin, Linn
    University West, Department of Engineering Science, Division of Manufacturing Processes.
    Inter-communication management in cases with disabled children2015In: International Conference on Information Society, Technical Co-Sponsored by IEEE UK/RI Computer Chapter, November 9-11, 2015, London, UK: Proceedings / [ed] Charles A. Shoniregun & Galyna A. Akmayeva, Infonomics Society, 2015, p. 30-31Conference paper (Refereed)
    Abstract [en]

    Since the use of Information and communication tools has offered new possibilities for improving different aspect of the healthcare sector, the objective of this research is to design an Information and Communication Technology (ICT) tool to assist the learning process of caretakers of special need children inSweden. The research is based on long-term observations and indepth interviews with key experts, with the aim of developing a tool which should assist the intercommunication between caretakers, creating optimized action plans in a work integrated environment. Enhancing the learning processes of the caretakers’methods and knowledge of each other’s work processes through knowledge bridging between all caretakers involved and hence have a direct influence on the child’s development.

  • 121.
    Hussain, Dena
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Gustavsson Christiernin, Linn
    University West, Department of Engineering Science, Division of Production Systems.
    Utilizing ICT Tools when Developing Healthcare Processes and Action Plans for Special Needs Children2016In: Proceedings 2016 IEEE First International Conference on Connected Health: Applications, Systems and Engineering Technologies (CHASE), IEEE, 2016, p. 334-335, article id 7545853Conference paper (Refereed)
    Abstract [en]

    Technological advances lead to the development of an increasing number of computer-based devices and software applications, used in the healthcare sector. Recently, rehabilitation programs involving special need children in Sweden have been the focused for these applications. The aim of this project is to create an evidence-based online platform that can be used on a computer or media pads directly together with the child. The platform should help different caretakers to structure their work, hence forward and enhance action plans for individuals with special needs. A secondary aim is to identify gaps in the existing approach to stimulate future research efforts to develop new Information and Communication Technologies (ICT) in this context. By utilizing ICT tools to create a more integrated communication platform between different regions in the healthcare sector and rehabilitation programs, we hope to verify, via this study, the growths and understanding of how improved communication affects can change the process in regards to creating action plans and support organizations in creating efficient connections.

  • 122.
    Hussain, Matloob
    et al.
    Earth Sciences department, Quaid-i-Azam University, Islamabad, Pakistan.
    Eshagh, Mehdi
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Zulfiqar, Ahmed
    Quaid-i-Azam University, Department of Earth Sciences, Islamabad, Pakistan.
    Sadiq, Mohammed
    Quaid-i-Azam University, Department of Earth Sciences, Islamabad, Pakistan.
    Fatolazadeh, Farzam
    K. N. Toosi University of Technology, Department of Geodesy, Iran.
    Changes in gravitational parameters inferred from time-variable GRACE data- A case study for October 2005 Kashmir Earthquake2016In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 132, p. 174-183Article in journal (Refereed)
    Abstract [en]

    The earth's gravity changes are attributed to the redistribution of masses within and/or on the surface of the earth, which are due to the frictional sliding, tensile cracking and/or cataclastic flow of rocks along the faults and detectable by earthquake events. Inversely, the gravity changes are useful to describe the earthquake seismicity over the active orogenic belts. The time variable gravimetric data are hardly available to the public domain. However, Gravity Recovery and Climatic Experiment (GRACE) is the only satellite mission dedicated to model the variation of the gravity field and an available source to the science community. Here, we have tried to envisage gravity changes in terms of gravity anomaly (Δg), geoid (N) and the gravity gradients over the Indo-Pak plate with emphasis upon Kashmir earthquake of October 2005. For this purpose, we engaged the spherical harmonic coefficients of monthly gravity solutions from the GRACE satellite mission, which have good coverage over the entire globe with unprecedented accuracy. We have analysed numerically the solutions after removing the hydrological signals, during August to November 2005, in terms of corresponding monthly differentials of gravity anomaly, geoid and the gradients. The regional structures like Main Mantle Thrust (MMT), Main Karakoram Thrust (MKT), Herat and Chaman faults are in closed association with topography and with gravity parameters from the GRACE gravimetry and EGM2008 model. The monthly differentials of these quantities indicate the stress accumulation in the northeast direction in the study area. Our numerical results show that the horizontal gravity gradients seem to be in good agreement with tectonic boundaries and differentials of the gravitational elements are subtle to the redistribution of rock masses and topography caused by 2005 Kashmir earthquake. Moreover, the gradients are rather more helpful for extracting the coseismic gravity signatures caused by seismicity over the area. Higher positive values of gravity components having higher terrain elevations are more vulnerable to the seismicity and lower risk of diastrophism otherwise.

  • 123.
    Hällsten, Christoffer
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Jordfelssimulering och modell-validering med PSCAD av ett impedansjordat distributionsnät2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis has been carried out at Vattenfall Eldistribution at the department Control and Protection with the objective to design and evaluate a network model for ground fault simulations in PSCAD. The reconversion from overhead lines to underground cables has led to increased capacitances in the distribution network and this places greater demands on the feeder protection unit and network analyzes in order to assure that faulted feeders are disconnected according to regulatory requirements. The aim of this work has been to determine how a network model could be designed for analysis of stationary signal characteristics and evaluate how great accuracy the power system model have compared to real earth fault test results.

    Earth fault simulations are performed with fault resistances of 3 kΩ and 5 kΩ. The power system model have been created to emulate a real impedance grounded network according to the π-model in PSCAD based on system information from Vattenfalls network management program Netbas. Results from the simulations have been compared against results obtained from real earth faults from the physical network with different settings on the central compensation equipment placed between the transformers neutral and ground. Simulations show, despite assumptions and some uncertainty about the actual zero sequence components similar results when fault resistance was 3 kΩ, both when compensation coil are fully tuned and out of tune ± 30 A corresponding to the feeder capacitance. The overall signal sequence conform quite well to the real network but at the same time simulations with 5 kΩ obtains greater deviations when results are represented in percentage. Particularly prominent abnormalities could be identified in the phase angle between zero sequence voltage and zero sequence current.

    An analysis of deviations from the simulations in the digital network model against the real system indicates that the model probably could be further optimized if zero sequence impedances, dc components, and tolerances that occur in the real systems reactive compensation equipment and measuring circuits are taken into account.

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  • 124.
    Håkansson, Kent
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Icke-proprietärt implementationsförslag på en kunds nätverkskrav2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Companies and users both sets requirements on how the connection to the Internet is per-ceived; be it for transactions, 'collaboration', or just plain surfing. These requirements make the network design needs to be redundant and modular. This in turn has led to, among other things Cisco has made recommendations and suggestions for the design called for the Cisco Validated Design. Among Cisco's recommendations include several proprietary technologies and protocols to meet network requirements.

    For credibility's sake, specification with requirements from a fictitious customer has been provided whose requirements shall be met with the help of Cisco Validated Design and non-proprietary protocols and techniques. To give the fictional specification measurable data as-sumptions has been made and clearer definitions created based on what the customer's situ-ation analysis shows.

    The solution provided is based on Cisco hardware but implements non-proprietary standards as widely as possible. Techniques and protocols can be replaced with non-proprietary ones, but the specifications cannot be fully met.

  • 125.
    Håkansson, Linn
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Herrström, Elenore
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Transformerade koordinater i referenssystemet SWEREF 992015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden is made up of properties and a property is bounded by means of markings, such as stud in rock or pipes in the ground. The physical location of a property's bounds does not always correspond with the coordinates in the reference system, resulting in discrepancies. Through the years, several reference systems has been used, and with each change implemented, a transformation between the old and the new system is done. Today SWEREF 99 is the most applied reference system in Sweden when measuring in the plane.The purpose of this study was to investigate the boundary markers and reference points in part of the area of Ammenäs in Uddevalla municipality. Questions to be answered is: How well does the physical boundary markers and the reference points correspond with the transformed coordinates in the reference system SWEREF 99? What can be the cause ofdifferences? How do deviations affect the practical work with ordinances in the area and how can these be overcome? Through the study, both qualitative and quantitative methodology were applied. The qualitative method has been used for fact collection, both through literature and through interviews and e-mail contact with staff at Uddevalla municipality. The quantitative method was used for the measurement of property boundaries and reference points. Collected data were compared with the coordinates in the reference system SWEREF 99. The results have shown discrepancies between the physical boundary markers and the transformed coordinates in the reference system SWEREF 99. Reference points in the area are consistent with the reference system. The gist of the result is that reference points in part of the area has not given rise to the boundary deviations. The study has revealed that discrepancies existed already in the 1940s, the deviations have since followed in the different reference system changes made over the years. Discrepancies can occur at the interconnection of different core networks and can cause differences in the measurement. The reference network was established in the area after the first properties were formed. Before the SWEREF transition only support measurement on the reference points was performed. To deal with the discrepancies, a new transformation which also supports measurements at boundary markings are needed. Since the deviations do not affect the practical work in Ammenäs, such a process will not take place.

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  • 126.
    Iskander, Fady
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Abdallah, Mahdi
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Analys av övertoner i Akzo Nobels anläggning i Bohus2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study deals with the general description about power quality harmonics. It also describes the problems and the overload that emerge during the occurrence of harmonics and their origin in the powerline. EMC, Electromagnetic Compatibility indicates how devices can co-operate without affecting or causing disruption to each other. Power quality is a phenomenon that describes different criteria about how to determine the electricity supply based on its technical quality. When talking about harmonics one talk about non-linear loads that occur in Swedish power network and has gained more attention through the years because of the increase in the levels. Harmonics origins from non-linear electrical equipment such as loads (equipment that consumers use), generation of electricity (production of power at e.g. windmill) and powerline (in transformers). During the non-linear loads the current load becomes non-sinusoidal which result in harmonics distortion that leads to a drop in the voltage. The consequence of this phenomena is that it occurs harmonics in the voltage. This means that the curve of the current load is distinguished from the normal sinusoidal curve based on the frequency and the amplitude. THD (Total Harmonic Distortion) is an indication of the harmonics distortion and can be calculated to determine the distortion in both the current and the voltage.

    Akzo Nobel’s power line was studied to analyze the harmonics distortion for both the current and the voltage through different procedures on different frequency converters. The measurements were done on the low voltage line. The conclusion was that though the current showed high levels of the harmonics distortion which could be excluded because of the low levels of the harmonics distortion in the voltage which were stable and normal, which indicates that there is probably no damage done to the equipment and machines. Suggestions on certain solutions is that an installation of a special filter could be done to be able to reduce the levels of harmonics. Recommendations on further studies is to make more measurements but with equipment that can handle measurements on higher currents - and voltage levels where you can study the high voltage line instead.

  • 127.
    Jansson, Edvin
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Jenssen, Johan
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Social engineering and publik säkerhet2017Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This thesis examines how Social Engineering works. An experiment was performed where persons were misled to unwittingly give away their user data used on the Internet. This report explains the common techniques of Social Engineering, such as Phishing, Man-in-theMiddle, Pretexting and Shoulder-surfing. In today's society, Social Engineering is a growing problem. Social Engineering is difficult to defend against because these attacks are difficult to detect. Therefore, it is important to know how the attack works, and what consequences it creates. Using Social Engineering, a person can use various means to mislead, deceive and pretend to be a person they are not. With the right strategic planning, Social Engineering is a strong tool to access sensitive information. It means big losses for both individuals and companies. To find out how Social Engineering works, an experiment with a selected method was chosen. The method was based on the Phising technique. The goal of the experiment was to try to get people to log into Facebook via a computer. Theoretically, a keylogger could have been installed on the computers that were used, and user data could have been recorded. A fictitious experiment was created to mislead people. The fictitious experiment concealed the true experiment so that people would not become suspicious. To find out how the public sees on the Internet Security and Social Engineering they were asked to fill in a questionnaire about the experiment. The results generated by the experiment showed that it's easy to fool people to unknowingly give away their sensitive information. Date

  • 128.
    Jaris, Khalil
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Abdallah, Abbas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Analys, utredning och effektivisering av nättariffer i Vallentuna2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This Bachelor´s thesis has been carried out at Elverket Vallentuna department of powerlines with the intention to analyze the cost correctness of the tariffs, provide a basis for an eventual transition into power tariffs as well as describe how such a transition shall be done. The current tariff system is divided into two different categories which are fuse tariffs and power tariffs. With the help of a theory study as well as additional calculations it will be determined if a complete transition into power tariffs is both economical and valid. This study also reports a survey and an analysis of the Swedish powerline companies power tariffs and what limit they have chosen to put on the transition as well as why.

    As the charge of the tariff electricity network becomes more justified with the use of power tariffs the switch from fuse tariffs to power tariffs becomes appropriate for all customers. This is not something which changes the short time consumption but instead should be viewed as a long term plan which hopefully leads to a lower amount of power peaks through a changed customer behavior.

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  • 129.
    Jarl, Markus
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Bengtsson, Fredrik
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Reservmatningsmöjligheter vid transformatorhaveri2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Kungälv Energi owns and is responsible of Kungälv municipality's electricity grid. With an increasing population and increasing demands on the grid and especially security of supply. With cold winters and large energy gives rise to a more difficult situation regarding security of supply. Currently, Kungälv Energi two receiving stations, a 130 / 10kV station and 130 / 20kV station. 130 / 10kV station is approaching a point where power demand is approaching the maximum distribution capacity. Therefore sets out a plan to cope with the power demand at the failure of one of two 130 / 10kV transformers of the receiving station M1.

    The results of the report shows that sufficient capacity is available in nearby distribution stations to cope with the emergency operation under high loads without any other components damaged.

    The report deals primarily with power flows to check that they do not exceed transformers, lines and cables rated power. In the majority of cases have also factors for distress load been counted with, which gives the result that all lines of Kungälv Energi can handle the increased load. Detected bottlenecks in the network have been highlighted, communicated and proposed changes to Kungälv Energi to prevent future problems.

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  • 130.
    Johansson, Anders
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Sundström, Alexander
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Beredning av lågspänningsnät på Åstol2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project concerns the different processes involved in the preparatory work for a local low voltage power grid. TROLK El & Tele AB will, at the request of Ellevio AB, conduct preparations to demolish the overhead power lines that make up the existing power grid on the island Åstol off the coast of Tjörn and replace it with an underground cable grid. Today, many grid owners opt to replace their overhead power lines with underground cables as it provides higher reliability and makes the grid less vulnerable to weather conditions. Multiple field visits have been carried out during the course of the project to provide a clearer perception of the circumstances and conditions surrounding the project as well as to establish customer contact. Some changes have been made to the preparation as a result of these visits, for example, the location of a number of cables that would be placed down steep slopes was changed. This would have potentially resulted in increased risk for workers, as well as unnecessary costs and would be time-consuming. Alternative solutions concerning, for example, the location of cable distribution cabinets have been chosen as a result of requests from residents on the island or the local road association. The reconstruction of the grid is encompassed by the demolition of 1180 meters of overhead power lines and 25 utility poles, as well as the replacement of 11 cable distribution cabinets and the rebuilding of one of the two substations located within the area. The entire project affects a total of 59 customers. A preliminary P2 cost calculation has been carried out, which currently shows a cost of approximately 1.2 million SEK, but this may be subject to change in the future as negotiations with various stakeholders is still ongoing.

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  • 131.
    Johansson, Filippa
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Karlsson, Lenita
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Displacement Analysis of a Geodetic Network: A case study of the Vasa warship2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    By measuring coordinates repeatedly in time we can detect movements of an area or an object by establishing and monitoring a geodetic network. Since it is known that the Vasa warship is suffering from decomposition, a geodetic network has been established around the ship to monitor its deformation. This is an important task for preserving and supporting the ship in its place. In this thesis, time series of coordinates are considered over 22 epochs of the ship measurements, a quadratic line is fitted to them and acceleration and velocity for each point on the ship’s hull are obtained. The x-axis is across the ship, the y-axis is along and the zaxis is the vertical one in the local coordinate system of the ship. A method is developed for monitoring displacement and its error at different parts on the ship in two successive epochs, considering the covariances between the point coordinates. The covariances influence the result of the displacement. Significant displacements, calculated with a variance-covariance matrix were compared with the displacements calculated without variance-covariance matrix. Considering the covariances gave 108 more insignificant three dimensional displacements, which means that they are in the order of random errors. The largest acceleration and velocity are found in the upper part of the ship stern in the Zcoordinates, where all points have significant acceleration and velocity. The ship bow has the second highest acceleration and velocity, while the midsection of the ship seems to be more stabile. In the X- and Y-coordinates the acceleration and velocity are smaller, in Ycoordinates almost all points have significant acceleration and velocity. In the Xcoordinates there are several points of data with insignificant acceleration and velocity, most of them located at the midsection of the vessel. The results show that the ship is moving and accelerating at various speeds on different sides of the ship, which indicates that there are parts that suffer from more crucial decomposing. The stern is the part of the vessel that has the highest velocity, acceleration and displacement. The ship is moving downwards with respect to the museum building at the same time as it tilting towards the port. The down pulling force can explain the movements downwards, the strength of the oak can also be one reason. The tilting could depend on the support structure since points in various part of the ship seems to have the same amount of movement in the direction towards the port.

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  • 132.
    Johansson, Gus
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Rovala, Thomas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Resource analysis of PXE based deployment solutions from Microsoft, Acronis and the FOG project2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a PXE based deployment an operating system is sent or installed over an IP based net-work, creating a centralised point of control for the management of multiple clients to effectively minimise the workload of the administrator and the total time needed to install operating systems. This project examines the processor, memory and network utilisation of four selected PXE based operating system deployment solutions - Acronis Snap Deploy 5, FOG and two variants of Windows Deployment Services (WDS) - in a part virtualised and part physical environment to determine their differences, scalability and appropriate role.

    The experimental setup consisted of five client computers, a traffic log server, and a server hosting virtual machines onto which the solutions were installed. Measurements were done using Windows Performance Monitor on the main server to poll data from its virtual machines. The time frame of each deployment was determined by the time stamp of the first DHCPDiscover packet sent from a client to the point of time where the network communication between the server and client(s) was complete.

    Acronis and FOG were determined to be much faster than WDS in regards of time, where Acronis adds less time per added client in multicast environments than FOG. The processor utilisation is increased for all systems in multicast scenarios compared to unicast deployments, and Acronis had the highest average and peak processor utilisation throughout the processor measurements. Memory utilisation is a non-issue, and no significant increase was detected between unicast and multicast deployments, or when adding clients to a multicast scenario. The FOG machine running CentOS 6.7 and Linux Integration Services displayed excessive amounts of memory utilisation, a symptom not displayed with LIS inactive. This is determined to be the fault of LIS, and not FOG. Acronis and FOG forward multicast data about four times faster than WDS, which leaves little reason to choose WDS over the other two. Acronis includes some useful proprietary features not found in FOG, and utilises more processor time. The main reason to choose FOG over Acronis is the fact that it is open source and free to download.

  • 133.
    Johansson, Gus
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Shegai, Kirill
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Maxad Stream: Analys av CPU-användning med OBS, Open Broadcaster Software2015Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The art of sending audio and video in real time is highly regarded and used daily by both individuals and organizations. The transfer of the data necessary is demanding for both parties. This thesis analyses the CPU usage on both sides for possible optimization. Data collection is performed during a live session between a transmitter and a receiver with recommended compared to optimal settings for the screen capture software OBS. The results show that the more CPU usage dedicated to the transmitting process increases the outputs quality without affecting the viewers resources. OBS CPU usage increase is about the same percentage for each encoding preset, which facilitates and provides more understanding for optimization.

  • 134.
    Johansson, Maria
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Karlsson, Chatrine
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Genomförandeavtal: Innehåll och reglering av avtal2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Implementation Agreement is a civil contract with public legal basis. No law deals with establishing the implementing agreement, however, the municipality and the developer support from, among other things, the Planning and Building Act (PBA) and the Public Procurement Act (LOU) on the formation of contracts. In previous studies, the problem regarding the lack of legislation regulating the establishment of implementation agreements has been discussed.

    The primary purpose is to analyze six executive agreements in California. The review is based on a text analysis, i.e. a qualitative method to gain a deeper understanding of how contracts are written. A compilation is done to get a good overview of the various provisions of the agreements.

    The three questions answered in this study refers to what the municipality and the developer regulate in the agreements, what possibly has no legal basis and also if the plan is implemented.

    The results of the study show that two of the six contracts that have been included in the study are less detailed, while the other four are more detailed. After reviewing the agreement in the study, a conclusion is drawn that basic information such as parties, exploitation area and the purchase price is included in all contracts.

    In common for the agreements are also that some formulations are imprecise and therefore difficult to interpret. The agreements also contain conditions that may lack legal support. It was also found that the area were basically designed according to detailed plans.

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  • 135.
    Johansson, Sarah
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Ångcentralen – säker kran2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor´s thesis was performed at SCA Hygiene Products, Edet Mill in Lilla Edet. This project was conducted between November in 2016 to January in 2017. The purpose with this project was to give the company a basis that first of all can be used to program a safety PLC and improve the crane automation. This is because the incidents have occurred where the crane tipped material over areas where trucks and people can stay. The goal was to give the company a basis of what they should think about when the PLC is about to be programed and drawings over how the new equipment is supposed to be installed. The project started with a literature study over which laws, directives and standards that is applying to cranes. This was followed by a study on how a risk analysis is structured. With the help of the literature study and risk analysis, a to-do list and a functional description was established. When they were finished, the work began on the development plans of the new equipment. With the help of the studies performed, this work has resulted in a functional description that was based on the results of the risk analysis. When the functional description was finished, the work with the to-do list could start as it was something to build on. When the to-do list was complete, work could begin with the drawings.

  • 136.
    Johansson, Therese
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Borneskär, Sara
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Från plan till verklighet: En helhetsbild av genomförandeprocessen för allmän plats, med enskilt huvudmannaskap2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The study comprises four case studies, in the form of detailed plans from the three municipalities in Västra Götaland. The detailed individual has principal responsibility in a public place, and each case study includes a survey and analysis of the implementation process of a public place. Documents that have been reviewed are flat map, planning and implementation description, contract (development agreements / land use agreements) and ordinances. Finally a visit was performed in each planning area, by a visual inspection. Preliminary work, SOU 's, lagkommentarer, Propositions and previous studies focusing on individual principal on public places, has been read to get a knowledge base for the study. Older laws have been studied, such as the elderly Planning and Building Act 1987, in order to know the legislation of the detailed plans that are subject of the study. The study has its origins from two theses from the year 2012, which covered a similar subject. The difference in this study is that the agreements been added as an additional document, to create an overall picture of the implementation process of a public place with a single principal responsibility. Qualitative method with a hermeneutic approach has been used, where text interpretation has been the central approach, to understand the municipality's underlying intentions for public places. Analyses of the text documents have been conducted to investigate whether they contain the same issues. The aim was to see how the implementation process is complex, and how clearly municipality ensures its intentions for the general location of the plane map into reality. In completed case studies we have seen that municipalities use the agreement to partially regulate the design of public space, and only partial use of the possibility to enter the planning regulations on the design of plan map. We have also seen that the intentions in the general location plan map, doesn´t always agree with the planning and implementation descriptions. Despite this, the site visits revealed that the facilities for the public space is implemented in accordance with the plan map. The experience we had with us is that site visits are an important part in contact with the plans. Site visits gave us a better understanding of the municipality's intentions when text documents interpreted, and assess accessibility in public places. It's something we think should be used more, even when new detailed plans drawn up. The implementation process from plan to reality is a complex process. The process includes several different parts, where communication between officials is important to intentions of zoning should not to change or fall away. The municipality should therefore monitor each document established in the implementation process, to ensure the intentions and reduce the chance that reality will not be that the municipality has planned.

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  • 137.
    Jonassen, Victoria
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Brycke, Sara
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Villkor för att säkerställa byggnation och bevarande av hyresrätter: En studie om hur kommunerna går tillväga i praktiken2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sweden's municipalities are legally responsible for creating good housing opportunities for the inhabitants. In the current situation there is a great demand for housing, mainly in Sweden's big-city regions. Municipalities with rather expensive prices on land and growing population create high pressure on the rental apartments. Therefore, it is of interest to local authorities to ensure the construction of rental apartments and that the apartments remain as rental apartments and are not converted to other forms of tenure, in order to prevent conversion of contemplate and profit.

    The purpose of the study is to examine how local authorities can ensure building strategies and keep tenancy rights to the sale of municipal land, with a focus on how regulation is done in practice. To give the study a broader perspective also the building companies were contacted in order to find out their attitude to the municipalities requirements.

    The study is conducted through a qualitative contract review procedure with additional interviews to examine how municipality authorities will ensure the construction of rental apartments in practice. A request for an agreement was sent to Sweden's 20 largest municipalities, counted in population size. 16 of the 20 municipalities contributed with agreements. Selection of interviewees was based on the in-originated agreements to represent all methods to ensure the construction and preservation of rental apartments.

    The result shows that the municipalities apply leasehold, additional consideration, payment and prohibition against conversion to direct tenure. Some municipalities choose not to control tenure in the contract, instead they rely on trust between the municipality and the developer. In the current situation there is no tool in the PBL for controlling tenure and there is neither no obvious solution to contractually guarantee the rental building and its preservation. Con-examination shows that in practice there are differences regarding how local authorities applied different methods.

    In conclusion, there is a great interest of local authorities to design a sustainable and operational approach. To build and maintain rental apartments is a difficult question in the cur-rent situation. It is manifested by the municipality, that there is some lack of knowledge regarding the legality of contracts. In this perspective it would clearly be preferable for both municipal and builder if the procedure was more explicit.

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  • 138.
    Jonasson, Johanna
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Kravspecifikation för central hantering utav kundspecifika Active Directory2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report focus on what should be identified in a requirement specification to implement a central overlaying system at an IT-supplier with multiple customer specific Active Direc-tory. The identification has been done by using an iterative approach by observations and triangulation. The supplier I have been working with is Zetup AB. A requirement specifica-tion is produced together with the customer to collect the need of a system and what it is supposed to perform. The purpose of the requirement specification is to facilitate the iden-tification of a system to Zetup. The system will help and improve ordinary existing job as-signments in Active Directory. The development of the requirement specification has been done with an iterative approach where the gathering of requirements has been made re-peatedly times. An investigation of the ordinary job assignments in Active Directory and technologies how to facilitate them are discussed in the report. The judgement of the speci-fication have been done by a quantitative approach by Zetup. When working with iterative methods the requirements have been discussed several times with the customer which have generated an approved judgement. The conclusions shows that a requirement specification helps the customer to collect information about the need and what needs to be required and why, for an implementation to take place. For an IT-supplier it is important to find so-lutions that promote both the employees and the customers by reducing time on problems that are solvable to add focus on more important tasks.

  • 139.
    Jonsson, Andreas
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Andersson, Andreas
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Förslag på 36kV uppsamlingsnät för landbaserad vindkraftpark2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report contains a suggestion for a projected wind farm in northern Sweden.The farm contains 101 wind turbines that shall be connected together with a collection grid and connected to a substation.The report contains two different suggestions of dimension and location of the cables for the grid. The turbines are divided into clusters and shown in maps and single line diagramsChosen suggestions and dimensions are reasoned with calculations and basic theory regarding cable sizing. The chosen cable types and lengths for both suggestions are shown in table form, together with a simplified cost comparison.After simulations have been run in power world simulator programme, the values was checked for authenticity with the π-circuit formula.The calculations shows that the selection of cables have accomplished low losses, and the increase of voltage is well within limits for both suggestions.The contribution of reactive power in the collection grid is also within the limits of what the wind turbines can compensate.A suggestion for future work on this project could be the design and dimension of the substation and the safety equipment.

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  • 140.
    Josefsson, Erik
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Mattson, Mattues
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    An investigation of the current situation regarding SSH related attacks by the use of Kippo honeypots2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report investigated the current situation regarding attacks targeting the SSH protocol. The study included Kippo SSH honeypots that were deployed in a residential- and campus environment for a duration of 31 days. As part of the study a comparison between these environments was done to identify differences and similarities. A similar comparison was made with related studies in order to view tendencies and trends. Important data that was extracted and examined were the scale of the attacks, username/password combinations, attack activity over time and the sources of the attacks.

    The results from our study showed that attacks targeting SSH has increased compared to similar studies. Minor changes were identified in regards to used username/password and the geo-location of attacking IPs. The results from the comparison between the two environments showed that the residential honeypot was much more targeted than the campus honeypot.

  • 141.
    Josefsson, Tommy
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Inventering av befintliga lågspänningsskyddsinställningar på Borealis AB2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    The documentation of all low-voltage protections at Borealis AB is located in an old EDSA program and Borealis is replacing this program with Vision. The purpose of this diploma work is to check all protections and to ensure that the settings are correct, before Borealis put data on the protections at the factory in Vision. The diploma work also includes making current-time curves to make sure that short-circuit protection meet the necessary requirements and then make suggestions to the company about improvement.

    Because many low-voltage protections are very old, the inventory of the protections and thecreation of the current-time curves have been a great challenge. The reason is that the manuals for the old protections have unclear description of how the current-time curves are created. This has resulted in that approximately half of all low-voltage current-time curves has no documentations.

    Borealis has developed two suggested for conditions on what changed settings must include. These are:

    "Low-voltage protections must not trip slower than 0.2-0.3s at short-circuit currents"

    "Low-voltage short-circuit protections must be set lower than the minimum shortcircuit current."

    Many protections needs lower current and time settings, as they are higher than the requirements. A suggestion for future work is to make deeper investigation of all low-voltage protectors, especially for the protectors which are old and lack current-time curves. Another suggestion is to contact the supplier to obtain new manuals which has unclear manuals or lack of manuals. At worst, Borealis has to buy new protection to obtain new manuals and safer protection.

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  • 142.
    Jussila, Daniel
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Sjöman, Hampus
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Comparing IS-IS convergence time with four networks running IPv4, IPV6 or IPV4/IPV6 Dual-Stack protocol.2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This article shows the convergence time of IS-IS (Intermediate System to Intermediate System) in a default settings network and in an optimized network. We test to see if the convergence time changes depending on if you have a network with only IPv4 addresses, only IPv6 addresses or a network with both mixed in dual-stack. No noticeable difference was found, the thing that affected our outcome the most was the time it took for IS-IS to notice that the link had gone down. In our tests we only had 4 networks to populate our database, this caused our SPF (Shortest Path First) algorithm to be done almost immediately, databases with more entries might have more of an impact.

  • 143.
    Jägerholt, Daniel
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Rundin, Henrik
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Båtnadsbedömningar: En studie av bildade gemensamhetsanläggningar2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There are many situations where facilities cannot be accommodated within the confines of the property itself and where several properties have the need to use the facility. A joint facility can be a solution to the situation. There are often several facility purposes within the same joint facility, in zoning planed areas not the least. There has to be advantage when forming a joint facility, which means that the economic advantage or advantage of"alternate nature" must weigh more than the costs and inconveniences. Advantage can be considered as apparent for some facilities, for example road-access for properties from a public road. It can be considered to be less clear that advantage can be attained for children's playgrounds for example, which is the reason why this particular purpose is a prerequisite for the implementation of this study.

    The aim of this study is to examine the trial of the advantage when forming a joint facility. The core questions are: Can the cadastral surveyors trial of the advantage be deduced in the document records? If the cadastral surveyors trial of the advantage is further justified, is advantage of "alternate nature" or social advantages then mentioned? Do the documentcontain a calculation regarding the advantage? Can it be deduced that the cadastral procedure is affected by an operative zoning plan.

    The study is based upon a quantitative examination of cadastral procedure documents. Hermeneutical method and interviews have been used to acquire a deeper understanding ofthe collected materials. The study concludes that the cadastral surveyors trial of the advantage is not further justified. "Alternate nature" is not mentioned at all in the studied documents and only one document has declared a partial calculation. It is clear that the judgement of the advantage has been implemented with some kind of "copy-paste" template, regardless of whether advantage is apparent or not. The seemingly simple aim to examine how cadastral surveyors, in their decision regarding the facility,formulate their judgement of the advantage can be answered in different ways. The short answer is: No obstacles exist, according to the 6 § of the Swedish equivalence to the jointfacilities act (1973:1149). The story of the long answer is that the short answer includes many influencing factors. One of them is that the cadastral surveyor should work quickly,cost effectively and provide good service to citizens, as a government official.

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  • 144.
    Järpestam, David
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Brattlöf, Magnus
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Prestandaskillnad på ett platt och hierarkiskt internetleverantörsnätverk2016Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Den här rapporten är en jämförande studie som mäter svarstid på två olika nätverksdesigner, en platt- och en hierarkisk-design. Den platta designen är en nuvarande lösning hos en viss internetleverantör i Göteborg. Internetleverantören tjänstgör flera hundra kunder med uppkoppling, samt upprätthåller kunders servrar som står placerade hos internetleverantören. Det innebär att kunder ställer höga krav på låg latens genom internetleverantörens nätverk och ut mot internet för att klara dagens krav på uppkopplad realtidstrafik. För närvarande är leverantörens nätverk suboptimalt utformat och de är i behov av förbättring för att uppfylla kraven i tillgänglighet, prestanda och stabilitet.Mätningar har utförts på två nerskalade modeller av internetleverantörens nätverk i två olika scenarier. Resultatet visade att den hierarkiska nätverksdesignen gav en förbättrad svarstid gentemot den platta i två olika scenarier

  • 145.
    Jönsson, Mathias
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Tank, Joakim
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Measuring behavior of μTP across a physical network2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Peer to Peer traffic currently stands for a portion of the global traffic on the internet, and uses TCP as its transport protocol. TCP requires packet loss to detect congestion, which means a degradation in services needs to occur before TCP can act. This is why BitTorrent Inc created μTP, to try and mitigate the impact P2P applications have on other traffic. μTP detects congestion with the help of one way latency and can use this to avoid interfering with other flows. This means that it only uses the left over bandwidth.

    In this report, we use a physical network to analyze how μTP manages to avoid having an impact on other traffic by only utilizing left over bandwidth. Using μTorrent with μTP we can see the impact on FTP traffic in comparison with μTorrent using TCP. The measure-ments were made at 2 Mbps, 5 Mbps, 8 Mbps and 10 Mbps, all with FTP taking 25 %, 50 % or 75 % of the bandwidth, leaving the remainder as left over bandwidth. By also measur-ing the one way latency we found that when it's consistently below 100 ms, μTP stops yielding to other traffic. This happens at 8 Mbps when FTP takes up 75 % of the band-width and all of the 10 Mbps measurements. We conclude that μTP functions well at lower speeds, having a small impact on the FTP traffic, but stops functioning at higher speeds and instead have a worse impact on the FTP traffic than μTorrent with TCP.

  • 146.
    Jönsson, Mathias
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Tank, Joakim
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Undersökning av hur en stor routingtabell påverkar en router.2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studiens syfte var att undersöka hur storleken av en routingtabell påverkar en routers kapacitet att ta emot och skicka paket till olika destinationer. Det som undersökningen ville komma fram till var vid vilken punkt som en routingtabell blir så stor att routern inte kan utföra sin uppgift. Detta utfördes med en dator som skickade paket till routern som fick leta genom sin routeringtabell för att sedan skicka paketen till en multilayer switch som i sin tur skickade paketen tillbaka till en annan port på datorn. Det enda som då ändrades i systemet mellan mätningarna var mängden routes i routingtabellen. Resultatet av studien var att vid 100 000 routes så gick funktionen av routern ner till den nivå då den hade varit störande i ett nätverk. Vid 115 000 routes så stängdes Cisco Express Forwarding (CEF) av på routern, denna punkt vad också där testen avslutades då routern kunde räknas som obrukbar.

  • 147.
    Kagerin, Maria
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Nätanalys hos delar av Ale Els lågspänningsnät som underlag för framtida reinvesteringar2017Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes a grid analysis of parts of Ale El’s grid to facilitate future re-investments in the grid. The thesis aims to make a compilation of reinvestment requirements for two 10 kV line associated low voltage grid and their substations. A grid analysis can be performed in various ways and include several different parts. The grid analysis includes a description of the area and grid calculations performed in dpPower to investigate which parts of the grid that are not optimally designed. This, together with field visits and study of power outage statistics resulted in various proposals for action.

    Substations of type "Combi Lomma" have been ranked according to their need to be re-placed. Thereafter measures have been proposed in 9 different substations with the aim to reduce voltage drop, break-times, overloads and increase reliability. As an example of these measures is improving the quality of electricity for a customer with 17% voltage drop, 8.9 s break-time and parts of the line supplying the costumer has a load rate of 130 %. The overhead line that is supplying the costumer at present could be replaced with cables in the ground and a distribution board could be installed. This would result in a calculated voltage drop reduced to 3.9%, break-time to 0,047s and the load rate to 49%.

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  • 148.
    Kangas, David
    et al.
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Sanderöd Roxell, Joel
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Improvement of a big data statistic system: using multi-level mid-tier caching2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This work presents the improvement and optimization of a statistic system containing big data. Both the performance and the visual presentation of the system are addressed but the main focus is against the performance part of the problem.

    Baseline benchmarks of the performance and analysis regarding the visual presentation of the system are conducted. Multiple solutions are discussed, evaluated and critically analyzed to find the right key for this problem.

    The technique of implementing a Multi-Level Mid-Tier cache with an "Update on Event" trigger is proposed as a solution to the performance issues in the system. By implementing a hierarchical structure to a mid-tier cache, the idea is to provide a highly dynamic, configu-rable and responsive system without compromises. The Multi-Level Mid-Tier cache is in this implementation consisting of two levels; one static and one dynamic.

    The creation of a multi-platform compatible user interface is proposed as a solution to the visual presentation. This is done by revising the front end of the system by implementing API; s such as JQMobile and DataTables.

    Benchmarks of the improved system are performed. Both the loading time of the system and the derivative of the increase of loading time are tested in the same way as for the base-line results. Comparing these results with the baseline results lead towards the conclusion which confirms the sterling functionality of the Multi-Level Mid-Tier Cache.

    The Multi-Level Mid-Tier cache eliminated the performance problems of the MyMo statis-tic system. The loading time at 10 000 reports is decreased by 96,45% and the derivative at the same point is decreased by 98,40% without the any compromises to the accessible data.

  • 149.
    Karlfeldt, Johan
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Kostnadseffektiv nätverksövervakning med Raspberry Pi 2 och Cacti2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Prestandan i våra nätverk spelar en allt större roll i takt med att vi hittar nya sätt att kommunicera och verka genom dem. Nätverk har idag också en viktig roll hos många företag och organisationer. Prestandaförluster och oplanerade driftstopp kan få stora konsekvenser vilket medför att implementeringen av nätverksövervakning i våra nätverk blir viktigt. Det här examensarbetet syftar till att undersöka hur en Raspberry Pi 2, med mjukvaran Cacti, klarar av att hantera de uppgifter som ett nätverksövervakningssystem ställs inför. Datainsamling sker genom att utläsa hur systemets genomsnittliga processorbelastning sett ut under de senaste fem och femton minuterna vid olika typer av scenarion. Systemet har belastats genom att öka antalet övervakade nätverksenheter samt genom att generera grafer av insamlad data. Resultatet visar att en Raspberry Pi 2 med Cacti fungerar utmärkt att använda för övervakning av nätverksmiljöer men får problem med långa laddningstider när flera grafer ska genereras samtidigt, vilket försämrar användarupplevelsen.

  • 150.
    Karlsson, Anders
    University West, Department of Engineering Science, Division of Computer, Electrical and Surveying Engineering.
    Utvärdering av elektriska fördelningssystem i medicinska utrymmen2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis has been carried out at AF Industry. The purpose of the thesis is to compare two electric distribution systems for medical areas. In medical areas the availability of electric power always has to be maintained. Power failure of life supporting equipment will generate major risks to the patient in question. Swedish standard promotes TN-S-systems compared to the European standard that promotes IT-systems for medical areas. By comparing the advantage and disadvantage of these two systems there can be a complete report compiled, which purpose is to be used to support decision making for future customers. This bachelor thesis will be exemplified in Östra sjukhuset where existing IT-systems will be upgraded.The basic difference between these two electric power systems is their connection to earth. TN-S-systems has direct connection to earth compared to IT-systems that has none or partially connection with earth. Earth fault in TN-systems can generate major current compared to IT-systems where isolations fault generates minimal current. However IT-systems and their isolation monitoring systems might appear as a more complex system compared to TN-S which is a more accepted system in Sweden.The report states that IT-systems has major advantage against TN-systems. The reason is that potential earth fault currents in TN-S-systems might end up disconnecting the fuse or residual current breaker of affected distribution system. This issue doesn't exist in IT-systems where minor fault current is generated from isolation fault. Therefore the recommendation is to equip these medical areas with IT-systems and the associated insulation monitoring systems. This technical solution provides adequate safety for both personal and patients regarding to electrical safety.

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