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  • 1.
    Abtahi, Farhad
    et al.
    KTH, School of Technology and Health (STH). Karolinska Institute, Sweden.
    Anund, A.
    Fors, C.
    Seoane, Fernando
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. Karolinska Institute, Sweden.
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. Karolinska Institute, Sweden.
    Association of drivers’ sleepiness with heart rate variability: A pilot study with drivers on real roads2017In: EMBEC & NBC 2017, Springer, 2017, Vol. 65, p. 149-152Conference paper (Refereed)
    Abstract [en]

    Vehicle crashes lead to huge economic and social consequences, and one non-negligible cause of accident is driver sleepiness. Driver sleepiness analysis based on the monitoring of vehicle acceleration, steering and deviation from the road or physiological and behavioral monitoring of the driver, e.g., monitoring of yawning, head pose, eye blinks and eye closures, electroencephalogram, electrooculogram, electromyogram and electrocardiogram (ECG), have been used as a part of sleepiness alert systems. Heart rate variability (HRV) is a potential method for monitoring of driver sleepiness. Despite previous positive reports from the use of HRV for sleepiness detection, results are often inconsistent between studies. In this work, we have re-evaluated the feasibility of using HRV for detecting drivers’ sleepiness during real road driving. A database consists of ECG measurements from 10 drivers, driving during morning, afternoon and night sessions on real road were used. Drivers have reported their average sleepiness level by using the Karolinska sleepiness scale once every five minutes. Statistical analysis was performed to evaluate the potential of HRV indexes to distinguish between alert, first signs of sleepiness and severe sleepiness states. The results suggest that individual subjects show different reactions to sleepiness, which produces an individual change in HRV indicators. The results motivate future work for more personalized approaches in sleepiness detection.

  • 2.
    Abtahi, Farhad
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems.
    Lu, Ke
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems.
    Dizon, M
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems.
    Johansson, M
    KTH-School of Technology and Health.
    Seoane, Fernando
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems. Högskolan i Borås.
    Lindecrantz, Kaj
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. Högskolan i Borås, Akademin för vård, arbetsliv och välfärd.
    Evaluating Atrial Fibrillation Detection Algorithm based on Heart Rate Variability analysis2015In: Medicinteknikdagarna, Uppsala: Svensk förening för medicinsk teknik och fysik , 2015Conference paper (Refereed)
  • 3.
    Ahmady, Tobias
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Klein Rosmar, Sander
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Translation of keywords between English and Swedish2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this project, we have investigated how to perform rule-based machine translation of sets of keywords between two languages. The goal was to translate an input set, which contains one or more keywords in a source language, to a corresponding set of keywords, with the same number of elements, in the target language. However, some words in the source language may have several senses and may be translated to several, or no, words in the target language. If ambiguous translations occur, the best translation of the keyword should be chosen with respect to the context. In traditional machine translation, a word's context is determined by a phrase or sentences where the word occurs. In this project, the set of keywords represents the context.

    By investigating traditional approaches to machine translation (MT), we designed and described models for the specific purpose of keyword- translation. We have proposed a solution, based on direct translation for translating keywords between English and Swedish. In the proposed solu- tion, we also introduced a simple graph-based model for solving ambigu- ous translations. 

  • 4.
    Ahmed, Tanvir Saif
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Markovic, Bratislav
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Distribuerade datalagringssystem för tjänsteleverantörer: Undersökning av olika användningsfall för distribuerade datalagringssystem2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a study of three different uses cases has been made within the field of data storage, which are as following: Cold Storage, High Performance Storage and Virtual Machine Storage. The purpose of the survey is to give an overview of commercial distributed file systems and a deeper study of open source codes distributed file systems in order to find the most optimal solution for these use cases. Within the study, previous works concerning performance, data protection and costs were an-alyzed and compared in means to find different functionalities (snapshotting, multi-tenancy, data duplication and data replication) which distinguish modern distributed file systems. Both commercial and open distributed file systems were examined. A cost estimation for commercial and open distrib-uted file systems were made in means to find out the profitability for these two types of distributed file systems.After comparing and analyzing previous works, it was clear that the open source distributed file sys-tem Ceph was proper as a solution in accordance to the objectives that were set for High Performance Storage and Virtual Machine Storage. The cost estimation showed that it was more profitable to im-plement an open distributed file system. This study can be used as guidance to choose between different distributed file systems.

  • 5.
    Alameddine, Raged
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Dashtbozorg, Sajad
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utredning av för- och nackdelar med TN-S respektive TN-C system2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this report analysis the advantages and disadvantages of the TN-C (four conductor system) and TN-S (five conductor system) system. There are different opinion about which system is most appropriate to use in the distribution network and the building main lines. With the help of literature studies and contacts with various power companies and electric companies different opinion have been discussed . TN-C is the most appropriate option in the distribution network and TN-S should be used in the building main lines. This for achieving high and stable electrical environment. This thesis will facilitate the choice of technology and hopefully increase the knowledge about the subject.

  • 6.
    Al-Battat, Ahmed
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Anwer, Noora
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utvärdering utifrån ett mjukvaruutveckling perspektiv av ramverk för SharePoint2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The functionality was tested by two different tests, which showed that the product is suitable for usage in the intranet within a company or an organization, there are great benefits from using intranet as a tool for sharing of information. A good intranet contributes to a better flow of information and effective cooperation. SharePoint is a platform for intranet with interactive features, it makes the job easier for staff and even the company. The framework Omnia is a solution designed for Microsoft SharePoint 2013.This essay evaluates how Omnia acts as a framework and what the product is suitable for. Omnia framework evaluates carefully and is an independent assessment carried during this essay. The evaluation is based on scientific studies which are based on the qualitative and quantitative research methodology. The evaluator's main areas are based on system performance, scalability, architecture and functionality. A test prototype develops during the process in the form of an employee vacation request application by the development framework Omnia.The framework Omnia is considered to be suitable for the development of interactive web-based applications for SharePoint. The architecture for the system meets the requirements for scalable systems because it is based on the tier architecture. The system also has good performance but it needs to be improved if the number of users exceeds one thousand. The functionality of this product is quite suitable for the system's usage.

  • 7.
    Ali, Abdi
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    START AND STOP COSTS FOR SECONDARY REGULATION OF FORTUM HYDROPOWER PLANTS2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Kopiera in engelskt abstract från rapporten.

  • 8.
    Al-Qaysi, Bashar
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Björk, Sara
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Evaluation of tools for automatedacceptance testing of webapplications2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Auddly provides a music management tool that gathers all information about a musical piece in oneplace. The acceptance testing on their web application is done manually, which has become bothtime and money consuming. To solve this problem, an evaluation on automated acceptance testingwas done to find a testing tool suitable for their web application. The evaluation was performed byfinding the current existing testing strategies to later compare the tools implementing these strategies.When analyzing the results it was found that two testing strategies were best suited for automatedacceptance testing. The Visual Recognition strategy that identifies components using screenshotsand the Record and Replay strategy that identifies them by their underlying ID. The choice betweenthem depends on which of these properties are modified more often.It was also found that automating acceptance testing is best applied for regression testing, otherwiseit should be performed with a manual approach.It was made clear that the Selenium tool, which uses the Record and Replay strategy, was best suitedfor Auddly’s acceptance testing. Selenium is able to test AJAX-calls with a manual modificationand is a free and open source tool with a large community.

  • 9.
    Alsén, Caroline
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Kostnadsfördelar med IoT för hissystem2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of things is today a development that is strongly moving forward to make society more con-trolled by technology, modern and it will be easier for many people. This technology can be used in many diffrent industries and work areas, such as elevator monitoring. This report evaluates the benefits with Internet of things within elevator monitoring. The company Safeline Sweden AB has developed a product that will make it easier to monitor elevators from a distance. An investigation of this product has been done and what their advantages were. After that, a buisness model was formed for Safelines new product IMS. By interviewing potential customers, the information about the sitaution today and the approach for new technology was discovered. The information from the interviews was then used to create a good and sustainable business model for Safeline.A buisness model was created for Safeline Sweden AB and the produkt IMS. The business model describes how the company should launch the new product, how the customer relations should be created, developed and retained. The information from the interviews made it clear that the IMS should be sold as a system solution because it is considered to be more attractive and be more valu-able for the customers.

  • 10.
    Amri, Abdurrahman
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Hashosh, Wameedh
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Visualisering av storadatamängder i en webbläsare2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Scania AB owns the complex test systems that generate complex and large amounts of data. To take advantage of this data, it must be stored in a suitable database, de-pending on the data type. One of these test systems is Hardware-In-the-Loop which tests electrical system and produces large amounts of electrical signals. The data of these electrical signals will be saved in the form of JSON files.In the current system, these data are stored and visualized in an inefficient manner. The purpose of this study was to investigate 4 relevant databases that can handle JSON files. The second part of this work was to visualize signals in the web brow-ser.Results of investigations show that two databases were more qualified to replace the current database. CouchDB and PostgreSQL was a test-item to measure their performance in terms of response time in relation to file size and the number of signals.Results of the tests show that CouchDB has higher performance for retrieving data than PostgreSQL. Then, a prototype was developed in order to visualize the signals in the web browser.

  • 11.
    Andersson, Andreas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Spirometri med en smarttelefon: Utveckling av en app för att mäta rotationshastigheten till en spirometerprototyp för smarttelefoner2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal with this bachelor thesis was to develop an application with an algorithm to measure the rotation speed of a prototype, as a low-cost solution for measuring spirometry with a smartphone. In a pilot study it was investigated how a smartphone can be used to measure health and what algorithms there are to detect motion in videos. After the pilot study an app with the function to record a video by using the camera of a smartphone and then use an algorithm to detect the rotation speed in the spirometry-prototype’s turbine was developed. To make it work it is important that the rotation speed is low enough so it does not exceed half of the cameras fps. Therefore, to capture the rotation speed of the spirometry-prototype’s turbine the rotation needs to be limited and a smartphone with a camera with at least 120 fps is required.The result of this work is an algorithm that can measure the rotation speed in the spirometry prototype turbine. The algorithm is detecting the peaks in a PPG. To minimize the computation time and to increase the accuracy the algorithm analyses the colour intensity over a ROI in every frame. There is great potential to use this algorithm to further develop this alternative method of measuring spirometry.

  • 12.
    Andersson, Marcus
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Implementation av en metod för prestandamätning av sensorkommunikation med Bluetooth low energy2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things develops and grows constantly. It becomes increasingly common that applications and units are connected through a network. One of the technologies used for wirelessly linking together units is Bluetooth Low Energy. Preferences for the quality of a connection can vary. It is therefore important to conduct measurements of performance in order to know advantages and disadvantages that a networking technology has. 

    This thesis is about measurements of performance during data transfers between mobile devices and wireless sensors, as well as monitoring parameters that are given during the measurements. One method using monitoring packets inspired from previously made research, were designed and implemented in a system for Bluetooth Low Energy, which was then evaluated.

    The result was that two systems were created that presented data loss, delay variation and throughput, continuously on a mobile device. One system used the method with monitoring packets. The other system used a self-made method which made measurements with high precision, but that places higher demands on functions and performance of the sensor node, and on the mobile device. Experiments were conducted by using the systems and resulting values were analyzed.

  • 13.
    Araya, Cristian
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Singh, Manjinder
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Web API protocol and security analysis2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is problem that every company has its own customer portal. This problem can be solved by creating a platform that gathers all customers’ portals in one place. For such platform, it is required a web API protocol that is fast, secure and has capacity for many users. Consequently, a survey of various web API protocols has been made by testing their performance and security.

    The task was to find out which web API protocol offered high security as well as high performance in terms of response time both at low and high load. This included an investigation of previous work to find out if certain protocols could be ruled out. During the work, the platform’s backend was also developed, which needed to implement chosen web API protocols that would later be tested. The performed tests measured the APIs’ connection time and their response time with and without load. The results were analyzed and showed that the protocols had both pros and cons. Finally, a protocol was chosen that was suitable for the platform because it offered high security and fast connection. In addition, the server was not affected negatively by the number of connections. Reactive REST was the web API protocol chosen for this platform.

  • 14.
    Arrospide Echegaray, Daniel
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utvärdering av Självstyrandes-utvecklarramverket2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Within software engineering there is a diversity of process methods where each one has its specific purpose. A process method can be described as being a repeatable set of step with the purpose to achieve a task and reach a specific result. The majority of process methods found in this study are focused on the software product being developed. There seems to be a lack of process methods that can be used by software developers for there individual soft- ware process improvement. Individual software process improvement, refers to how the in- dividual software developer chooses to structure their own work with the purpose to obtain a specific result

    The Self-Governance Developer Framework (also called SGD-framework) whilst writing this is a newly developed process framework with the purpose of aiding the individual soft- ware developer to improve his own individual software process. Briefly explained the framework is intended to contain all the activities that can come up in a software project. The problem is that this tool has not yet been evaluated and therefore it is unknown if it is relevant for its purpose. To frame and guide the study three problem questions has been for- mulated (1) Is the framework complete for a smaller company in regards to it activities? (2) How high is the cost for the SGD-framework in regard of time?

    The goal of the study is to contribute for future studies for the framework by performing an action study where the Self-Governance Developer Framework is evaluated against a set of chosen evaluation criteria.

    An inductive qualitative research method was used when conducting the study. An induc- tive method means that conclusions are derived from empirically gathered data and from that data form general theories. Specifically, the action study method was used. Data was gathered by keeping a logbook and also time logging during the action study. To evaluate the framework, some evaluation criteria was used which were (1) Completeness, (2) Se- mantic correctness, (3) Cost. A narrative analysis was conducted over the data that was gathered for the criteria. The analysis took the problem formulations in regard.

    The results from the evaluation showed that the framework was not complete with the re- gards of the activities. Although next to complete as only a few activities were further needed during the action study. A total of 3 extra activities were added over the regular 40 activities. Around 10% of the time spent in activities were in activities outside of the Self- Governance Developer Framework. The activities were considered to finely comminute for the context of a smaller company. The framework was considered highly relevant for im- proving the individual software developers own process. The introduction cost in this study reflect on the time it took until the usage of the framework was considered consistent. In this study it was approximately 24 working days with a usage about 3.54% of an eight-hour work day. The total application cost of usage of the framework in the performed action study was on average 4.143 SEK/hour or 662,88 SEK/month. The template cost used was on 172.625 SEK/hour. 

  • 15.
    Aslamy, Benjamin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utveckling av ett multisensorsystem för falldetekteringsanordningar2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Accidental falls among the elderly is a major public health problem. As a result, a variety of systems have been developed for remote monitoring of the elderly to permit early detection of falls. The majority of the research that has been done so far in fall accidents has focused on developing new more successful algorithms spe- cifically to identify fall from non-fall. Although the statistics show that mortality and injuries caused by falls are increasing every year in conjunction with the in- creasing proportion of older people in the population.

    This thesis is about improving the current fall detection devices by covering the gaps and meet the needs of the current fall detection techniques. The improve- ments that have been identified is to provide a secure assessment of the patient's health and be able to call for aid more quickly when a fall occurs. Another im- provement is the mobility for the elderly to be outdoors and have the ability to per- form daily activities without being limited by the location position.

    In summary it can be said that a multisensor system in form of a prototype has been designed to cover the deficiencies and improvements that have been identi- fied. Apart from detection of falls and body movements through an accelerometer sensor the prototype does also include a sensor for detecting vital signs in form of ECG. It also supports cellular and wireless network communication in form of GPRS and Wi-Fi to enable freedom of movement for the elderly. Furthermore, the prototype includes a sensor for GPS that provides information about location position. 

  • 16.
    Axtelius, Mathias
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Alsawadi, Rami
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    An improved selection algorithm for access points in wireless local area networks: An improved selection algorithm for wireless iopsys devices2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Wireless devices search for access points when they want to connect to a network. A devicechooses an access point based on the received signal strength between the device and theaccess point. That method is good for staying connected in a local area network but it doesnot always offer the best performance, which can result in a slower connection. This is thestandard method of connection for wireless clients, which will be referred to as the standardprotocol. Larger networks commonly have a lot of access points in an area, which increasesthe coverage area and makes loss of signal a rare occurrence. Overlapping coverage zonesare also common, offering multiple choices for a client. The company Inteno wanted an alternativeconnection method for their gateways. The new method that was developed wouldforce the client to connect to an access point depending on the bitrate to the master, as wellas the received signal strength. These factors are affected by many different parameters.These parameters were noise, signal strength, link-rate, bandwidth usage and connectiontype. A new metric had to be introduced to make the decision process easier by unifying theavailable parameters. The new metric that was introduced is called score. A score system wascreated based on these metrics. The best suited access point would be the one with the highestscore. The developed protocol chose the gateway with the highest bitrate available, while thestandard protocol would invariably pick the closest gateway regardless. The developed protocolcould have been integrated to the standard protocol to gain the benefits of both. Thiscould not be accomplished since the information was not easily accessible on Inteno’s gatewaysand had to be neglected in this thesis.

  • 17.
    Baitar, Rami
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Riskanalys av elsystem med funktions-FMEA2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The risk analysis tool failure mode and effects analysis (FMEA) that analyzes the com-ponents and signals of a electrical system is design dependent and are therefore per-formed late in the development process of electrical systems. This could lead to that some errors are not analyzed in time and may need to be designed away which can lead to increased system complexity as well as longer and more expensive development proc-esses.The objective of this study is that through a literature review identify if there are any methods or approaches that enables Scania to implement a functional hazard analyzes early in the development process of electrical systems and to analyze these.The results of this thesis shows that it is possible to start the FMEA process early in the development process of the electrical system if the engineers have a functional perspec-tive in mind when performing the risk analysis where they list and rank the functions that is provided by the electrical system and their failure modes, failure effects, failure de-tection, severity, probability and occurrence.By using a function based FMEA, the engineer(s) can identify and promptly handle the safety critical functions early in the development process of a electrical system.A existing functionality at Scania has been broken down into functions and a functional hazard analysis has been performed on these as a demonstration of how a function based FMEA can be carried out and look like.

  • 18.
    Bandali, Benjamin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Availability and perceived availability with interaction design: Cost-effective availability model for a multinational company2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Techniques of measuring web-service uptime have always been a key metric to improve interaction and system integration. Availability is a usual metric in the field of statistics where the goal is to attract customers, but perhaps more importantly the users and providers which can improve the services through this metric. Since availability differs a lot depending on type of service, company and usage, a common problem is to define what availability really is.

    The thesis will give the readers an introduction to availability, and also explain the reasons why it may vary, which is the theory of interaction design behind a service. Though availability is a metric that can be calculated through many different ways, the result is very complex to understand for the public that is interested in it.

    The goal of this thesis is to give the readers an understanding and guidelines of how to define perceived availability based on the system availability, but also present a method of defining, calculating and present the metric in a user-friendly procedure. The result will in turn consist of a cost-effective model for perceived availability and be tested at a multinational company.

  • 19.
    Bergqvist, Timmy
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Solenergi med energieffektiva byggnader och kostnadseffektiv lagring2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    När en investering ska göras är priset en prioriterad faktor att ta hänsyn till. Att investera i ett solcellssystem kostar mycket pengar som på längre sikt kommer resultera i en större intäkt än kostnad. När detta inträffar skiljer sig markant i många fall och med regeringens krångliga regler blir det inte lättare. Examensarbetet innefattar flera analyserande lösnings-metoder för plusenergikontoret i Väla Gård, Helsingborg. Anledningen är att kostnadseffektivisera solcellssystemet så att intresset för solproduk-tionen ökar i Sverige.Tre olika kostnadsmässiga scenarier med timdebitering, egenlagring och nettodebitering jämförs och presenteras grundat på beräkningsmetod inom aktuell forskning. Det bäst lämpade scenarierna ges i form av ett önskat införande för optimal vinst för kund och miljö.Energimarknaden kan snabbt äventyras vilket gör att valet av lämplig lösning minskar solcellsägarens riskfaktor och förhoppningsvis ökar sol-energiproduktionen.

  • 20.
    Bhuddi, Amita
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Somos, Oliver
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Återställningsverktyg för fordon baserat på applikationsintegration2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The software testing team at Scania use a manual and time consuming process to restore a test vehicle after working with it. Several different applications are used in this process to ensure the vehicle is in the same state as it was before their testing. To improve the workflow with a reduced workload and a more robust process, the test team was interested in the development of a restoration application. It was desired to develop the restoration application by reusing the components to the greatest possible extend. Since there were many components that fulfilled the needs of most functions, a pre-study of all the applications was done to decide which components can be re-used. This was study was based on the integration model, Enterprise Application Integration, which aims to create a single product combining the applications used in an organization to simplify processes such as maintenance, data management and employee training. A prototype was developed which implements three existing modules on different levels and, in line with the goals of EAI, is itself a simple application that enables the components to work in unision

  • 21.
    Björklund, Johan
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Prestandautvärdering av permanentmagnetmotor2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project was to evaluate a synchronous three-phase permanent magnet motor with brushless outrunner. It is supposed to be a part of an electric drive system for equipment onboard sailing boats. The goal was to investigate the performance of the motor and find the construction weaknesses and to come up with suggestions how to optimize the performance of the motor.

     

    Tests and measurements were made with a test setup that consisted of inverter, motor and a generator connected to the shaft. The generator stator winding had a short circuit when the load current reached 106,1 A and the tests therefore had to end. The copper wire used in the windings temperature became to high and the isolation of the wire melted.  The tests showed that the motor could handle up to 92,1 A with an efficiency of 70%. It was how much current the winding could withstand together with the power losses that was the limiting factor of the motor construction.

     

    Forced cooling with water cooled stator or improving the winding wires ability to handle higher currents by increasing the cable area are both alternatives to get a better efficiency and motor performance.

  • 22.
    Björkvall, Dennis
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Ploug, Martin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Metod för automatiserad sammanfattning och nyckelordsgenerering2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The company Widespace handles hundreds of tasks (tickets) per week, which requires great overview by each employee. Because of this quantity, creating a clear view becomes a major problem. To solve this problem, a more consistent use of metadata is required, therefore, a study of metadata, automated summary and key words generation has been performed.

    The task was to develop a prototype that can automatically generate a summary, a list of keywords and give an indication of what language the text is written in. It was also included in the work to make a survey of earlier works to see which systems and methods that can be used for this task. Two prototypes were developed, compared with each other and evaluated. The methods used were based on both statistical and linguistic processes. Analysis of the results was done and showed that the prototype MkOne delivered the best results for the summary. The keyword list contained many precise keywords with high precision and a wide coverage.

  • 23.
    Björnström, Tommie
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Cederqvist, Reidar
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Comparison and Implementation of Software Frameworks for Internet of Things2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is no established standard for how Internet of Things devices are communicating with each other, every manufacturer uses their own proprietary software and protocols. This makes it difficult to ensure the best possible user experience. There are several projects that can become a standard for how devices discovering, communicating, networking etc. The goal for this thesis work was to compare such software frameworks in some areas and investigate how Inteno’s operating system Iopsys OS can be complemented by implement one of these frameworks. A literature study gave two candidates for the comparison, AllJoyn and Bonjour. The result of the comparison showed that AllJoyn was the most appropriate choice for Inteno to implement into their OS. AllJoyn was chosen because it has a potential to become an established standard and includes tools for easy implementation. To make a proof of concept, an AllJoyn application was created. The application together with a JavaScript web page, can show and control options for an AllJoyn Wi-Fi manager application and AllJoyn enabled lamps.

  • 24.
    Borgström, Fredrik
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Acceleration of FreeRTOS withSierra RTOS accelerator: Implementation of a FreeRTOS software layer onSierra RTOS accelerator2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today, the effect of the most common ways to improve the performance of embedded systems and real-time operating systems is stagnating. Therefore it is interesting to examine new ways to push the performance boundaries of embedded systems and real-time operating systems even further. It has previously been demonstrated that the hardware-based real-time operating system, Sierra, has better performance than the software-based real-time operating system, FreeRTOS. These real-time operating systems have also been shown to be similar in many aspects, which mean that it is possible for Sierra to accelerate FreeRTOS. In this thesis an implementation of such acceleration has been carried out. Because existing real-time operating systems are constantly in development combined with that it was several years since an earlier comparison between the two real-time operating systems was per-formed, FreeRTOS and Sierra were compared in terms of functionality and architecture also in this thesis. This comparison showed that FreeRTOS and Sierra share the most fundamental functions of a real-time operating system, and thus can be accelerated by Sierra, but that FreeRTOS also has a number of exclusive functions to facilitate the use of that real-time operating system. The infor-mation obtained by this comparison was the very essence of how the acceleration would be imple-mented. After a number of performance tests it could be concluded that all of the implemented functions, with the exception of a few, had shorter execution time than the corresponding functions in the original version of FreeRTOS.

  • 25.
    Brander, Thomas
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Dakermandji, Christian
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    En jämförelse mellan databashanterare med prestandatester och stora datamängder2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The company Nordicstation handles large amounts of data for Swedbank, where data is stored using the relational database Microsoft SQL Server 2012 (SQL Server). The existence of other databases designed for handling large amounts of data, makes it unclear if SQL Server is the best solution for this situation.  This degree project describes a comparison between databases using performance testing, with regard to the execution time of database queries.  The chosen databases were SQL Server, Cassandra and NuoDB. Cassandra is a column-oriented database designed for handling large amounts of data, NuoDB is a database that uses the main memory for data storage and is designed for scalability. The performance tests were executed in a virtual server environment with Windows Server 2012 R2 using an application written in Java. SQL Server was the database most suited for grouping, sorting and arithmetic operations. Cassandra had the shortest execution time for write operations while NuoDB performed best in read operations. This degree project concludes that minimizing disk operations leads to shorter execution times but the scalable solution, NuoDB, suffer severe performance losses when configured as a single-node. Nordicstation is recommended to upgrade to Microsoft SQL Server 2014, or later, because of the possibility to save tables in main memory.

  • 26.
    Brandt, Theodor
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    System för automatiska rekommendationer av nyheter och evenemang2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Technology is the key for Bonnier Business Media (BBM) to reach their goals and deliver future growth. Therefore they want to be in the very forefront when it comes to exploring new technologies that can improve their platforms and make them more up to date. BBM has among other things aimed to develop a recommendation system that is supposed to make the content of their web sites personalized and in an efficient way present this so that the different target groups will get the information that they expect. For example the visitor should be able to get suggestions on articles and events that might be of interest.

    The aim of this thesis has been to develop a prototype of a recommendation system with associated algorithms. The prototype could be used as to examine the possibility to create personalized recommendations for the readers on BBM:s website va.se (Veckans Affärer). The implementation of the recommendation system that was developed for BBM consisted of an object-based collaborative filtering algorithm using visitor behavior, publication date and popularity of articles and events to create personalized recommendations. After com- pleting tests and analyzes the results show that it is possible to create recommendations with a higher precision than a basic recommendation system, like a popularity list, can of- fer. 

  • 27.
    Brejcha, Kevin
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Prestandaanalys av HTTP/22015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Swedbank is one of Sweden’s biggest banks with estimated four million private customers and they are constantly trying to improve their services so they become more user-friendly and faster. To satisfy their customer’s need of fast and easy services Swedbank wants to lower the loading times on the web services to the user experience is faster and smoother, especially for the users doing their banking on a smartphone. The mission is to do a per-formance analysis of the new HTTP protocol HTTP/2 and take out the most essential parts so Swedbank knows what to take advantage of when installing the new versions on their servers to achieve optimal services.The results showed that after implementing HTTP/2’s new features, Swedbank’s website performance increased with 44% in total loading time. The tests were performed in a local experimental environment where the earlier HTTP versions was installed and the perfor-mance metrics was documented.

  • 28.
    Brenning, Magnus
    et al.
    KTH, School of Technology and Health (STH).
    Olander, Björn
    KTH, School of Technology and Health (STH).
    Orhan, Ibrahim
    KTH, School of Technology and Health (STH), Medical Engineering.
    Vennberg, Johan
    KTH, School of Technology and Health (STH).
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. 2Laboratory for communication networks, School of Electrical Engineering, KTH.
    NeTraWeb - A Web-Based Traffic Flow Performance Meter2006In: 4th Swedish National Computer Networking Workshop SNCNW 2006, 2006Conference paper (Refereed)
    Abstract [en]

    This paper presents a web-based traffic flow performance meter. The NeTraWeb tool configures and automates the measurement activities, including storage and presentation of the main performance parameters.

  • 29. Brown, Shannon
    et al.
    Ortiz-Catalan, Max
    Petersson, Joel
    Rodby, Kristian
    Seoane, Fernando
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering. University of Borås, Sweden.
    Intarsia-Sensorized Band and Textrodes for Real-Time Myoelectric Pattern Recognition2016In: Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS / [ed] Patton, J Barbieri, R Ji, J Jabbari, E Dokos, S Mukkamala, R Guiraud, D Jovanov, E Dhaher, Y Panescu, D Vangils, M Wheeler, B Dhawan, AP, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 6074-6077, article id 7592114Conference paper (Refereed)
    Abstract [en]

    Surface Electromyography (sEMG) has applications in prosthetics, diagnostics and neuromuscular rehabilitation. Self-adhesive Ag/AgCl are the electrodes preferentially used to capture sEMG in short-term studies, however their long-term application is limited. In this study we designed and evaluated a fully integrated smart textile band with electrical connecting tracks knitted with intarsia techniques and knitted textile electrodes. Real-time myoelectric pattern recognition for motor volition and signal-to-noise ratio (SNR) were used to compare its sensing performance versus the conventional Ag-AgCl electrodes. After a comprehending measurement and performance comparison of the sEMG recordings, no significant differences were found between the textile and the Ag-AgCl electrodes in SNR and prediction accuracy obtained from pattern recognition classifiers.

  • 30.
    Carlquist, Olle
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Boström Leijon, Santos
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Implikat: A System for Categorizing Products using Implicit Feedback on a Website2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Implicit feedback is a form a relevance feedback that is inferred from how users interact with an information retrieval system such as an online search engine. This degree project report describes a method of using implicit feedback to establish relevance judgments and rank products based on their relevance to a specified attribute. The report contains an overview of the benefits and limitations of implicit feedback, as well as a description on how those limitations can be mitigated.

    A prototype that interpreted user actions as relevance votes and calculat-ed a fair relevance score based on these votes with the help of an algo-rithm was developed. This system was then tested on a website with real users during a limited period of time. The results from the test period were evaluated and the system was concluded to be far from perfect, but that improvements could be made by making adjustments to the algo-rithm. The system performed better when looking at the algorithm’s pre-cision rather than its sensitivity.

  • 31.
    Chavez Alcarraz, Erick
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Moraga, Manuel
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Linked data performance in different databases: Comparison between SQL and NoSQL databases2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Meepo AB was investigating the possibility of developing a social rating and recommendation service. In a recommendation service, the user ratings are collected in a database, this data is then used in recommendation algorithms to create individual user recommendations.

    The purpose of this study was to find out which  demands are put on a DBMS, database management system, powering a recommendation service, what impact the NoSQL databases have on the performance of recommendation services compared to traditional relational databases, and which DBMS is most suited for storing the data needed to host a recommendation service.

    Five distinct NoSQL and Relational DBMS were examined, from these three candidates were chosen for a closer comparison.

    Following a study of recommendation algorithms and services, a test suite was created to compare DBMS performance in different areas using a data set of 100 million ratings.

    The results show that MongoDB had the best performance in most use cases, while Neo4j and MySQL struggled with queries spanning the whole data set.

    This paper however never compared performance for real production code. To get a better comparison, more research is needed. We recommend new performance tests for MongoDB and Neo4j using implementations of recommendation algorithms, a larger data set, and more powerful hardware.

  • 32. Cippitelli, E.
    et al.
    Gasparrini, S.
    Gambi, E.
    Spinsante, S.
    Wåhslén, Jonas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Orhan, Ibrahim
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Time synchronization and data fusion for RGB-Depth cameras and inertial sensors in AAL applications2015In: 2015 IEEE International Conference on Communication Workshop, ICCW 2015, IEEE conference proceedings, 2015, p. 265-270Conference paper (Refereed)
    Abstract [en]

    Ambient Assisted Living applications often need to integrate data from multiple sensors, to provide consistent information on the observed phenomena. Data fusion based on samples from several sensors requires accurate time synchronization with sufficient resolution, depending on the sensor sampling frequency. This work presents a technical platform for the efficient and accurate synchronization of the data captured from RGB-Depth cameras and wearable inertial sensors, that can be integrated in AAL solutions. A case study of sensor data fusion for Timed Up and Go test is also presented and discussed.

  • 33.
    Coskun, Volkan
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Automatisering av underhåll av produkter med inbyggda trådlösa sensorsystem: Fallstudie om tvättmaskin2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This project involves controlling a washing machine and examining it as efficient as possible, with a wireless in-built sensorsystem. The idea with this project is to oversee and connect it to a cloud, where it can be further analyzed. Two cloud services are presented, whereof one of which of them are used. Several usable sensors for the washing machine have been ex-amined and presented in order to find the most appropriate sensors. A smart sensor design is presented which describes the smart sensorsystem on a hardware-and software level. Five different input-/output models are presented.As shown in the results, the most accurate input-/output model is practi-cally tested on the washing machine where the sensorvalues are sent to the cloud, through the wireless embedded sensorsystem. The sensorvalues are thereafter presented on graphs and further analyzed. Simulated graphs with different methods are presented in order to show, that these models can benefit the economy and the environment.The evaluation of the results showed that an automation of the mainte-nance is possible based upon the measurements of the chosen parameters, from the presented input-/output model for a washing machine.

  • 34.
    Ding, Christofer
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Evaluation of Recommender System2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recommender System (RS) has become one of the most important component for many companies, such as YouTube and Amazon. A recommender system consists of a series of algorithms which predict and recommend products to users. This report covers the selection of many open source recommender system projects, and movie predictions are made using the selected recommender system. Based on the predictions, a comparison was made between precision and an improved precision algorithm.

    The selected RS uses singular value decomposition in the field of collaborative filtering. Based on the recommendation results produced by the RS, the comparison between precision and the improved precision algorithms showed that the result of improved precision is slightly higher than precision in different cutoff values and different dimensions of eigenvalues.

  • 35.
    Duvheim Bruce, Adam
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Indreeide, Ole Martn
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Beräkning av återmatad bromsenergi på Malmbanan2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Energy is a limited recourse and the use of energy has to be as effective as possible to avoid harmful effects on the environment and to cut spending. Reusing the energy the ore train uses to climb the mountains of northern Sweden through regenerative breaking leads to a more effective use of energy. Calculation of energy uses the trains’ stored energy and the losses during its journey along Malmbanan. This results in a total power save of 20 % for single track and between 20 % and 21 % for double track. Traffic on double track can increase but the relationship between regenerated and consumed energy will be the same. Regenerating energy on the railway reduces today’s negative impact on the environment and leads to savings in energy cost for the company.

  • 36.
    Edlund, Fredrik
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Sarker, Saqib
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Smart Kitchen: Automatisk inventering av föremål2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Internet of Things is growing fast and is predicted to become a part of everyday life. This can be used to create products which will make everyday life easier. Automated object detection combined with an automated inventory check can make it easier to manage what is in stock, this is something that can be used in smart refrigerators as an example, to make life more convenient through Internet of Things. This Bachelor thesis studies methods regarding object detection with the purpose to build a system which automatically identifies objects and manages the inventory status. A prototype was built and tested to see what the possibilities there is with such a system. The Prototype uses a Raspberry Pi as core unit, which uses Dlib libraries to identify predefined objects. The user will identify unknown objects via the mobile phone application, which makes it possible for the system to learn how to identify new objects. The same application is used to check the inventory status for the different objects that has been identified by the system. The prototype can identify objects and learn to identify new ones, according to the goals of the project.

  • 37.
    Ekman, Jonas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Evaluation of HCI models to control a network system through a graphical user interface2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    SAAB has a project under development for a network system with connected nodes, where the nodes are both information consumer and producer of different communication types. A node is an equipment or an object that are used by the army e.g. it can be a soldier, military hospital or an UAV. The nodes function as a part of a mission e.g. a mission can be Defend Gotland. The aim of this project is that the user will rank different missions from the one with the highest priority to the lowest. This will affect the network in a way that the communication between the nodes at the mission with the highest rank will be prioritised over the communication between the underlying missions. A user can via the GUI rank the missions, and then set the associated settings for them. Via the GUI the user should be able to work at three different levels. The first is to plan upcoming missions. The second one is in real time see if the system delivers the desired conditions. The last one is to simulate if the system can deliver the desired conditions.

    This thesis investigated various HCI models that could be used to create a GUI, to reduce the risk of a user configuring the system incorrectly. The study showed that there are no HCI models that take account for misconfigurations, and therefore a new model was created. The new model was used and evaluated by creating a prototype of a GUI for SAAB’s project and was tested on a potential user. The test showed that the new model reduced the risk of misconfigurations.

  • 38.
    Engström, Magnus
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Soheily, Nadia
    EKG-analys och presentation2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The interpretation of the ECG is an important method in the diagnosis of abnormal heart conditions and can be used proactively to discover previ-ously unknown heart problems. Being able to easily measure the ECG and get it analyzed and presented in a clear manner without having to consult a doctor is improtant to satisfy consumer needs.

    This report describes how an ECG signal is treated with different algo-rithms and methods to detect the heartbeat and its various parameters. This information is used to classify each heartbeat separately and thus determine whether the user has a normal or abnormal cardiac function. To achieve this a software prototype was developed in which the algorithms were implemented. A questionnaire survey was done in order to examine how the output of the software prototype should be presented for a user with no medical training.

    Seven ECG files from MIT-BIH Arrhythmia database were used for validation of the algorithms. The developed algorithms could detect of if any abnormality of heart function occurred and informed the users to consult a physician. The presentation of the heart function was based on the result from the questioner.

  • 39.
    Eriksson, John
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Comparing message-oriented middleware for financial assets trading2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many different message-oriented middlewares (MOM) exist today on the market. With different underlying designs, purposes and features, it is not easy to make the right choice of MOM for your system. The IT company Nordicstation is in such a situation where they need to make a choice of MOM. They currently own a system called Sharelock which generates reports about violations of financial assets trad- ing. They wish to make the process of generating a report more asynchronous by using a MOM and they have a couple of requirements.

    This thesis was carried out with the purpose of finding the most suitable products for the system in mind, compare their features, performance, licenses and ease-of- use. This was accomplished by analysing their installation process, monitoring in- terfaces, documentation on their websites and performance in a simple throughput test.

    The results showed that RabbitMQ was the strongest candidate. It had good per- formance, an attractive web interface for monitoring, an easy installation and it also offered commercial support. Apache Artemis was also found to be an attractive choice but it did not have a web interface which made it hard to manage the system. 

  • 40.
    Eriksson, Niklas
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Lifvendahl, Patrik
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utbildningssimulator av funktioner i spårfordon: Hårdvarusimulator med felsökning på dörrsystem2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is a description of a developed educational simulator over rail vehicles and its components. The simulator is a hardware-based prototype over a door system on rail vehi- cles. System specialists and technicians will use the prototype. The Simulator should give the user a technical demonstration on how components work in a door system. The proto- type consists of motor, switch, relay and sensor. The components are used for illustration of the functions in a door system on a rail vehicle. The educational simulator is controlled with a control unit and with pushbuttons for manual control. For demonstration of the boarding security an optical sensor is used as symbolize for the obstacle detection.

    The educational simulation has two embedded common faults: cable fault and ground fault. The instruction manual consists of a circuit diagram and is used for troubleshooting. The circuit diagram over the door system is used to find the faults and to correct them. The fault analysis includes the factors, which is the reason for the most common faults to occur in a rail vehicle. Door system receives diagnostic code from a door computer that control priori- tizing for arrangements that will be made. 

  • 41.
    Ernmark, Niklas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Utveckling av en CAN-adapter i ett sensorsystem för övervakning av däcktryck.: Development of a CAN-adapter in a sensor system for tire pressure monitoring.2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report describes a degree project at the Royal Institute of Technology. The purpose was to create a unique system solution in which a CAN adapter card (Controller Area Network) was to be integrated with an air pressure monitoring system for heavy duty vehicles. The goal was to present measurement values ​​from valve sensors on a personal computer. The air pressure monitoring system is called J1939 - TPMS and is a finished product. J1939 - TPMS sends CAN-frames to a CAN-bus in J1939 format. These frames are to be read by the adapter card and presented on a terminal program on a personal computer. The job has been to investigate how the J1939 - TPMS system works in detail. The role of the J1939 protocol and its relationship with CAN has been clarified. Also, a detailed description of how J1939 frames are interpreted and how the measuring data TPMS is decoded is done. Principles for how a CAN node works has been clarified. Based on this, a CAN adapter card has been designed. The design has included component selection, design of electronics schema, design of computer cards and development of embedded software. The result was a ready-to-use CAN adapter card tested with J1939-TPMS. Requirements for the project were met. However, more work with the card will be needed to make it a finished product. The work was carried out at Motion Control in Västerås AB in cooperation with Transeco Däckservice (Transeco Tire Service).

  • 42.
    Ezzeddine, Kassem
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Oskarsson, Robert
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Analys av kondensatorbatteriers tillkopplingsfenomen: Undersökning av de kopplingsfenomen som uppstår vid tillkoppling av kondensatorbatterier och deras påverkan på närliggande komponenter2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many electrical devices need reactive power to operate. Transmission of reactive power occupies a proportion of the available capacity in the power system and therefore capacitor banks are used near to the end user to generate reactive power. Thus, the reactive effect is generated and consumed in a separate part of the power system. Capacitor banks switching causes transients which may damage the surrounding components.

    Based on the real substation Stallbacka in Trollhättan, this study has analysed capacitor banks switching transients within the medium voltage level. The analysis has covered the size of these transients according to different conditions and scenarios. The result showed that the transients in this case never reached serious levels, thus there was no impact on the components. It is not clear whether the transients affect the power quality because there are no defined limits. 

    A calculation tool to the predicted transients was supposed to be created in the process. This calculation tool was never completed due to the unmanageable solution that was obtained.

  • 43.
    Farneland, Christian
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Harrysson, Magnus
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Developing a Human-Machine-Interface with high usability2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When developing a Human-Machine-Interface (HMI) it is important to make sure that it is easy to learn and use, to have high usability. If it does not, the operator of the machine suffers unnecessarily and it also becomes harder to sell for the producer of the machine. The effectiveness and efficiency of the machine drops down when it is hard to operate. To make it easier for future developers to reach a high usability factor when developing a HMI, this thesis aimed to find a carefully prepared process to follow when doing so. The result was a process that was tested out with a HMI prototype for waterjet cutting machines. This prototype was then tested in different use cases by both experienced operators as well as beginners. The testing produced positive feedback on the prototype, proving that the process that had been followed was being successful.

  • 44.
    Foitzik, John
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Comparison between two methods for 3D imaging of machine parts2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today the production time is shortened when components are made with additive manufac- turing and the finished products typically have very few defects. If the components quality is to be validated, it’s done with a Non-destructive testing method. In this thesis a test piece made of Inconel 939, that is used in high temperature application was examined with a non- destructive testing technique (NDT), computed tomography (CT) and with destructive test- ing (DT) by grinding the test piece down to a given position and taking images of the ex- posed surface. The purpose was to validate computed tomography images by doing a two- dimensional correlation between images from CT and DT using MATLAB. Due to tech- nical problems the resulting images were however not showing the same par of the test piece. Therefore the correlation method was instead validated. Modifying a 2D image from CT and running it in the code written in MATLAB could quantify the distortions in the images. Results are presented in figures and in tables. The table shows more detailed in- formation with exact coordinates and what correlation each area has. The figure shows the movements and direction of the changes. The result shows that the method can detect changes and does what was intended. 

  • 45.
    Fredrik, Nilsson
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Bodin, Arvid
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Ombyggnad av en statisk webbsida till en responsiv2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In today ́s society people are working more and more while travelling, which makes them use smartphones and tablets instead of laptops. These screens are usually smaller than a laptop screen. That is why a more dynamic web design has been re- quested in order to fit the screen on the device being used. The static webpage’s width was 1000 pixels and the goal was to fit all the tables and information in the respon- sive version with a width of 320 pixels. Important information also had to be moved to a different page in order to make it more visible. A new CSS-template was imple- mented and several new Java Scripts followed by finer adjustments to the HTML code. Since some information had to be more visible to the user, a new tab was cre- ated in order to fulfill this demand. The new tab contained information about “Net- work Status” only related to the signed in user. After simulating the webpage in Chrome the responsiveness of the page was confirmed on all screen sizes. Sending the webpage asynchronously made the slow pages respond instantly but the total loading time was still slow. To fix this, back-end programming would have been re- quired. The project’s webpage fulfilled all the requirements. 

  • 46.
    Freij, Urban
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Modelldriven arkitektur förbättrar hanteringen av problemet med import av data till ER-modeller2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In many situations it is desirable to import data from text files, excel files and similar to a database. To do so the data needs to be translated at some stage to an ER model (Entity Relationship), i.e. a model describing relevant parts of a database schema. The approach for this translation varies from case to case.

    During this thesis an application has been developed to import data to an ER model from a modeling perspective, in line with the Model Driven Architecture (MDA) ™. The gain lies in using a metamodel that describes how different models for transformation from grid tables to an ER mode may look like. The models in turn describe how the transformation will look, thus allowing the usage of several different models without any need of changes to the source code.

    The metamodel describing the transformation of data can be visualized in a class diagram. The class diagram schematically describes the relationships between tables of data to be imported from and the ER model the data will be transferred to. Preferable is to write a model in an XML that conforms to the metamodel. Therefore the class diagram should be transformed into an XML schema that enables validation of the model in the XML file.

  • 47.
    Gabrail, Philip
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Samuelsson, Sam
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Analys av fältfördelning i kabelavslut av linjära och icke linjära material: Analysis of the field distribution in cable termination by linear and nonlinear material2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays XLPE high voltage cables are used in transmission and distribution of electrical power and has an important role in the electrical system. Power transmission that occurs over long distances is diverted from one point to another and is done with the help of cable terminations. These cable terminations have some vulnerabilities that affect the entire power system.

    The theoretical part of the report was carried out with the help of FEM software Comsol Multiphysics. Results showed that the highest field concentration occurs at the insulation of the cable and caused malfunction and vulnerabilities. In the linear case for the electrical part resulted a high permittivity that the potential and the electric field was reduced, which showed the same result for low conductivity. For the nonlinear material the conductivity changes with the electric field and time.

    The temperature of the linear case showed that at high temperatures the material became more conductive. In the nonlinear case the conductive material was reduced. This could be controlled with different threshold value (Eb) which cannot in the linear case.

    The practical part was done in E.ON:s laboratory for different type of cable terminations that were tested with 33kV. Some of the tested cable terminations were used for testing purposes and was picked out of operation because of a malfunction in the cable. An attempt to control field concentration was carried out in the laboratory and resulted to a reduced field  istribution in the cable termination. The result of the practical part showed how the field concentration was distributed in the cable termination and that the field distribution led to the collapse of the cable.

  • 48. Gasparrini, S.
    et al.
    Cippitelli, E.
    Gambi, E.
    Spinsante, S.
    Wåhslén, Jonas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Orhan, Ibrahim
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Proposal and experimental evaluation of fall detection solution based on wearable and depth data fusion2016In: ICT Innovations 2015: Emerging Technologies For Better Living, Springer, 2016, Vol. 399, p. 99-108Conference paper (Refereed)
    Abstract [en]

    Fall injury issues represent a serious problem for elderly in our society. These people want to live in their home as long as possible and technology can improve their security and independence. In this work we study the joint use of a camera based system and wearable devices, in the so called data fusion approach, to design a fall detection solution. The synchronization issues between the heterogeneous data provided by the devices are properly treated, and three different fall detection algorithms are implemented. Experimental results are also provided, to compare the proposed solutions.

  • 49.
    Gatu, Andreas
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Svensson, Alexander
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Justerbar modell av transmissionsledning för elkraftsöverföring2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma work has been carried out on behalf of Terco. TercosPST 2220 Transmission Line and Distribution Module works as a physicalmodel of a real transmission and distribution grid where five different typesof networks based on length, voltage and apparent effect are available. Thereis today a need of a model where the user self can adjust these parameters sothat the model more precisely can reflect the characteristics that the specificgrid has. Here it’s investigated how the length and its impact on a line canbe varied in a model.A presentation of how the transmission and distribution grid works andare described theoretically provides the basics for the different models thatcan describe a whole network and its properties.Since the R, L and C components needs to be able to be varied to be ableto physically realize this theoretical model, the different methods that thiscan be realized through are investigated. Two approaches are investigated,the cascaded pi-model and variable active-passive reactance (VAPAR).A number of aspects like space, cost and variability makes the variableactive-passive reactance the most suited solution. Its function as a variablevoltage source, made out of an four switches, operated with control techno-logy and pulse width modulation, makes it possible to imitate R, L and Csproperties and effect on a transmission line. The result is that the necessaryR,L,C components are made adjustable in order to be incorporated in aadjustable transmission lin model.The result and the goal are verified with simulations where variableactive-passive reactance is proved able for further development and practicaltests to model transmission and distribution lines with different length.

    Keywords. Variability, Inverter, Impedance, DC-AC, Pulse width modula-tion, Harmonics, H-bridge, Transmission line, Voltage drop, Reactive effect.

  • 50.
    Gidlöf Örnerfors, Linus
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Testautomatisering av linjärmotorer2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This diploma work has been carried out on behalf of Stegia AB. Stegia manufacturesand sells linear motors that are tested in a test bench before shipped to thecustomer. Today there is a need for a test bench that collects test results from theperformed tests. The company would like to lower the risk of falsely made tests,and to make the test bench easier for the production staff to use. At this moment,the test of the linear motors is made up of several manual tasks before the test iscompleted. This increases the risk of wrong results because of incorrectly madetests, with no traceability of the results. The goal with this diploma work is to lowerthe risk of incorrect test result by automating the testing process for the productionstaff. The result is presented as a prototype, that should increase the reliability ofthe test result of the motors. The result is then validated and analyzed in this report.

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