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  • 151.
    Abdul Amir, Saga
    KTH, School of Engineering Sciences (SCI).
    Hur skapas en filmsuccé: En analys av inhemska filmintäkter i USA2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis seeks to examine, through the method of linear regression, if the profits of a movie can be predicted using information known prior to the release of the movie. The predictive variables were obtained from a dataset containing information available on the website IMDB. The films were split up into two groups and two different models were created: one for films with an experienced director and lead actor and one where experince wasn't taken into consideration. The results showed that while budget is consistently the driving factor for a films success, the involvement of an experienced director make predictions of success much easier.

  • 152.
    Abdul Hayee, Muhammad
    KTH, School of Chemical Science and Engineering (CHE).
    Characterization and utilization of agroforestryresidues as energy source in Brazil2012Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Brazil is very much rich in agriculture and forestry. The agro industry occupies an area of 28840726 ha. The more important crops are sugarcane (7080920 ha), rice (289030 ha), wheat (1853220 ha), coconut (283205 ha), cassava (1894460 ha), corn (13767400 ha) and grass (140000 ha). These crops generated 597 million tons of residues. Forest plantations in Brazil supplied 102.9 million m3 of industrial roundwood, of which nearly half is for renewable fuelwood and charcoal. Part of this plantation output is destined for the pulp and paper industry:

    The renewable sources are fulfilling 46.4% of the total Brazilian energy demands.

    Energy forestation in Brazil includes mainly Eucalyptus and Bracatingas.

    In this study three biomasses abundant in the Brazil are studied:  i.e. Eucalyptus, Garapeira/Peroba (wood dust) and Sewage Sludge.

    The wood samples (Eucalyptus and Peroba/Garapeira) have higher heating value than the sewage sludge because the wood samples have higher amounts of carbon and hydrogen than the sewage sludge. The sewage sludge has higher ash content and lower amount of volatiles and fixed carbon than the wood samples resulting in a lower heating value.

    The pyrolysis of eucalyptus, garapeira/peroba and sewage sludge has been studied in a thermobalance over a wide range of degradation temperatures. Between 225 °C - 375 °C (for eucalyptus) and 225 °C - 425 °C (for garapeira), the thermal decomposition of the biomass leads to significant weight loss.

    The weight loss for Eucalyptus between 265°C and 350°C is 0.48 % / °C and taking into account a heating rate of 10°C/min, the weight loss is 4.8 % /min. Garapeira has a similar behaviour than eucalyptus. The weight loss for garapeira between 265°C and 365°C is 0.4 % / °C and taking into account a heating rate of 10°C/min, the weight loss is 4 % /min.

    The behaviour of the sewage sludge to the increase of temperature from 25°C to 700 °C in an inert atmosphere do not show such different zones as the behaviour of the woody biomass. Between 150 °C and 235°C the weight loss of the sewage sludge was 0.07 %/°C (0.7 %/min). The highest weight loss takes place between 300 °C and 390 °C (0.15 %/°C or 1.5 %/min). In the third zone, between 500 °C and 600°C, the weight loss was 0.03 %/°C (0.3 %/min).

    The pyrolysis is assumed to be a first order decomposition. The activation energy (E) and the pre exponential factor (A) are calculated for the studied samples.

    The proximate analysis shows differences between the woody biomass and the sewage sludge. The sewage sludge has higher ash content and lower fixed carbon and volatiles. Eucalyptus has lower carbon fixed and higher volatiles than peroba-garapeira.

  • 153.
    Abdul Hussein, Murtada
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Al-Entabe, Faysal
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Vattenjet som poleringsmetod2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 154.
    Abdul- Rasool, Mustafa
    KTH, School of Electrical Engineering (EES), Automatic Control.
    THE IMPACT OF ECOROLL ON FUEL CONSUMPTION - USING LOOK AHEAD2011Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    EcoRoll reduces fuel consumption with small development costs, since no additional hardware is required. It is a function that enables a more efficient conversion of potential to kinetic energy, when travelling downhill. This is achieved by opening the powertrain, and let the engine run on idle to reduce engine losses. In this Master’s thesis, two control strategies were developed, where one is based on prevailing conditions and one utilizes Look-Ahead data. Compared to a vehicle with a conventional cruise control, the first strategy gave a fuel reduction of approximately 3.4% and the other 3.7%. This was simulated on the highway between Södertälje and Norrköping in Sweden.

  • 155.
    ABDULAZIZ, ALI ABDULBASIT
    et al.
    KTH, School of Chemical Science and Engineering (CHE).
    GHARIB ALI JALAL, IBRAHIM
    KTH, School of Chemical Science and Engineering (CHE).
    GHATTAS, ANGELIKA
    KTH, School of Chemical Science and Engineering (CHE).
    SWENSSON, BEATRICE
    KTH, School of Chemical Science and Engineering (CHE).
    Utformning av bränslecellssystem för fordon2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I detta kandidatexamensarbete var målet att optimera ett bränslecellssystem med avseende på ett antal olika parametrar. Bränslecellssystemet var tänkt att användas i fordonet Sleipner V som är konstruerad i samarbete med andra KTH studenter. En annan bränslecell av företaget Horizon användes för att driva fordonet Sleipner i tävlingen Shell-Eco Marathon eftersom den ursprungliga bränslecellen var i dåligt skick. Sleipner utrustat med bränslecellen från Horizon klarade av att köra två varv i Shell-Eco Marathon.

    I denna rapport tas det upp grundläggande teori om bränsleceller, försökuppställning för experimenten och resultat med tillhörande analys. För att åstadkomma målet med detta arbete så skulle olika parametrar undersökas, men detta kunde inte utföras. På grund av diverse problem med bränslecellen så ändrades fokus till att reparera bränslecellen, vid undersökningen av problemen har vissa resultat uppnåtts.

    Vid körning uppstod spänningsfall och det kan ha berott på masstransportbegränsningar. För att åtgärda dessa problem utfördes en torknings- respektive fuktningsprocess som hade olika påverkan på de individuella cellerna. Efter torkningsprocessen fungerade 18 av 22 celler medan 19 celler fungerade efter fuktningsprocessen.  De icke fungerade cellerna som gav låg spänning kan ha varit för blöta eller för torra.

  • 156.
    Abdulbaki, Mohammad
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Mammar Chaouche, Abdelah
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Användning av flygaska i vattenbyggnadsbetong 2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Engineering Concrete is used as a collective term for concrete structures related to the hydropower plants, dams and heavier plants. With great success, concrete has been used for a very long time for these types of structures. These constructions make high demands on the concrete quality and construction design as they are expected to have a lifetime of a hundred years or more.

     

    In casting such concrete is exposed to a temperature which can lead to cracking of the newly cast structure. Because the temperature rise is the primary cause of cracking, you can use various methods to reduce this. An effective way to reduce the temperature rise is to try to keep the cement content in the concrete as low as possible, because at the adiabatic conditions may say that the total temperature rise is directly proportional to the cement content in the concrete. An effective way to reduce the temperature rise is to use out some fly ash instead of cement. Fly ash is a powder mass obtained in the production of electricity and heat in coal-fired plants and cogeneration plants. Fly ash is a puzzolanic material which means that it reacts with calcium hydroxide and water, and can thus partially replace cement clinker.

     

    The purpose of this report is to provide a better understanding of how the fly ash affecting hydraulic concrete. By reading this report you will get at first a basic knowledge of what the concrete, hydraulic concrete and fly ash are. Furthermore, the section that dealt with the cracking of the hydraulic concrete, general knowledge followed out causes and remedies. A comparison has been made between a typical water building structural component, with and without fly ash. What has been compared are how the construction affected with and without fly ash on strength, resistance and the risk of cracking. Furthermore, the temperature dot calculations performed with the program HACON. The purpose of the calculations was to show how the different parameters with and without fly ash affects the risk of cracking of a typical hydraulic structures.

     

    The result of the temperature calculations show that you get a lower temperature development in a monolith cast with the fly ash and the construction cements compared to a monolith molded with construction cement without fly ash. With the reduced temperature development arose lower tensions in the flyashmonolith. In the survey carried out in this report, the results show that there is tension that exceeds the tensile strength of the monolith without fly ash and thereby bursting the structure. The monolith examined with fly ash as crackreducing action occurs tensile stresses which are lower than the tensile strength and thus does not crack structure. The results show that the cracking in a typical hydraulic structures can be reduced with fly ash.

  • 157.
    ABDUL-JALIL, CARLO
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    BEGLARYAN, SARGIS
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Ultralätt hopfällbar reflektor2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Datapath manufactures satellite antenna for telecommunication systems. These antennas have a wide range of application scope and are used in extreme environments, in war zones and hotspots. The antennas are very heavy, difficult to transport so the project group was asked to come up with a new design of light, foldable and easy transportable antenna reflectors. Datapath chose the M-Model for the future development, which was made for the military use. The existing antennas are very heavy and solid which makes it difficult to transport because it takes a large amount of space. The requirement for this project was to decrease the weight of the reflector by 50 percent and the transportation volume by 20 percent. The Bachelor thesis generated lots of different design and concepts with different choices of materials for the reflector, but only two concepts fulfilled all qualifications. The first concept was decided to have a body made completely out of Carbon fiber reinforced silicone (CFRS). This material is strong and robust once it unfolds and can stand external forces generated by strong winds, but it is very easy to fold it back and most important it is ultralight. The second concept was a reflector made of reflective fabric with an external shell construction made of polyethylene. Both of these concepts fulfill Datapath's requirements with aspect on weight, transportation volume and strength.

  • 158.
    ABDUL-JALIL, RICHARD
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    SELMAN, CHRISTOS
    KTH, School of Industrial Engineering and Management (ITM), Applied Mechanical Engineering (KTH Södertälje).
    Effektivisering och optimering av transport och emballage för kretskort2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 159.
    Abdulkadir, Hesho
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Kostov, Andrey Petrov
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Studie om energibesparing på OKQ8 i Häggvik samt andra energieffektiviserade byggnader2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The report begins with a brief description of some of the most common measures for energy savings in buildings with recess in the solar collectors and photovoltaic panels which lays a solid foundation for our study. Next comes the main part of the study consisting of detailed descriptions of three of the top streamlined Swedish buildings.

    The main purpose of this study is to investigate some of the energy efficiency improvements done on the OKQ8’s gasoline station in Häggvik with a calculate part. Part of the task is to calculate how many photovoltaic cell panels should be installed in order to cover the whole buildings energy need. After that have we calculated the payback time and profitability of some of the installations at the petrol station. We have also studied other energy optimized buildings and compared their specific energy need with that of OKQ8.

  • 160.
    Abdulla, Mohammad
    KTH, School of Information and Communication Technology (ICT).
    Modeling of Thermal Stresses and Analysis of Micro-Crack Formations in PCB Laminates2016Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This Master’s thesis has given me an opportunity to study how, where, when and why cracks appear in the Printed Circuit Board (PCB) laminate. Layout choices contribute to the likelihood of crack formation. Simulations were made on three different locations on one board, the results were then analyzed. Thermal simulation showed nearly no thermal gradient in the board, the temperature inside the board was almost the same as at the surface. This concluded that there was no need for linked thermal and structural simulation. Structural simulations showed that most of the stress and compressions in the laminate was around the vias.

  • 161.
    Abdulla, Nardien
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Ali, Mohammed
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Ett modernare sätt att dimensionera: En jämförelse för Huvudstaprojektet, FEM-design eller handberäkning ?2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This theses has been conducted in collaboration with Peab where the students had Tomas Schäfer and Peter Jansson as supervisors.

    This report addresses how a specific secondary build up, located in Huvudsta Centrum, could had been designed differently. The original frame was designed with the old BKR construction rules. But at the construction start a new construction standard was applied, the Eurocode. Therefore, the house got decreased in weight to meet the stricter Eurocode requirements.

    The current frame was designed using manual methods, which were compared with the results from the same frame calculated with a computer programme, FEM-Design 3D Structure. The report is based on the know-how of how a designer should proceed to join the production model and the analytical model. This to be able to designed in a BIM environment.

    The difference in results, between the two methods, was about 50% reeducation in purchased steel and about 40% in design-engineer costs. We have estimated a total saving of 141000 SEK for Peab.

  • 162.
    Abdullah Asif, Farazee M.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Information requirements and management for service based business models2014In: Swedish Production Symposium, 2014Conference paper (Refereed)
    Abstract [en]

    Anticipated scarcity of natural resources and concern for the sustainable development forcing manufacturing industries to emphasise on conservation of resources on one hand. On the other hand high competition in the manufacturing industry is forcing companies to look for innovative value propositions. Service based business models are emerging business solutions that fulfil the functional needs of customers. Such business approach demands extensive and sophisticated information collection, sharing and management systems. However, there are evidences of knowledge gap when it comes to defining information requirements, information management and sharing systems needed to adopt such business models. The objective of this paper is to provide an overview of research done in the area of service based business models in terms of information management and communication systems. The paper also includes result of two case studies done in two different manufacturing companies with the purposes to understand information requirements to adopt service based business models.

  • 163.
    Abdullah Asif, Farazee Mohammad
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Resource Conservative Manufacturing: New Generation of Manufacturing2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The question of resource scarcity and emerging pressure of environmentallegislations have put the manufacturing industry with a new challenge. On theone side, there is a huge population that demands a large quantity ofcommodities, on the other side, these demands have to be met by minimumresources and with permissible pollution that the earth’s ecosystem can handle.In this situation, technologic breakthrough that can offer alternative resourceshas become essential. Unfortunately, breakthroughs do not follow any rule ofthumb and while waiting for a miracle, the manufacturing industry has to findways to conserve resources. Within this research the anatomy of a large body ofknowledge has been performed to find the best available practices for resourceconservation. Critical review of the research revealed that none of the availablesolutions are compatible with the level of resource conservation desired by themanufacturing industry or by society. It has also been discovered that a largegap exists between the solutions perceived by the scientists and theapplicability of those solutions. Through careful evaluation of the state-of-theart,the research presented in this thesis introduced a solution of maximizingresource conservation i.e., material, energy and value added, as used inmanufacturing. The solutions emerged from the novel concept named asResource Conservative Manufacturing, which is built upon the concept ofMultiple Lifecycle of product. Unlike other research work, the researchdocumented in this thesis started with the identification of the problem andfrom which a ‘wish to do’ list was drawn. The seriousness of the problem andpotential of adopting the proposed concept has been justified with concreteinformation. A great number of arguments have been presented to show theexisting gaps in the research and from that, a set of solutions to conserveresources has been proposed. Finally, one of the prime hypotheses concerningclosed loop supply chain has been validated through the system dynamicsmodeling and simulation.

  • 164.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Nicolescu, Cornel Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Minimizing Uncertainty Involved in Designing the Closed-loop Supply Network for Multiple-lifecycle of Products2010In: Annals Of DAAAM for 2010 & Proceedings of 21st DAAAM Symposium: Intelligent Manufacturing and Automation / [ed] Branko Katalinic, Zadar: DAAAM International , 2010, 1055-1056 p.Conference paper (Refereed)
    Abstract [en]

    To ensure multiple-lifecycle of products through remanufacturing intervention requires a well-functioning closed-loop supply network. Generally, the unpredictability of quantity, timing and quality (physical/functional) of the returned products and demand fluctuation of the remanufactured products are the main sources of uncertainty of closed-loop supply network. To some extent, efficient recollection strategies and separate distribution channels for remanufactured products can minimize the uncertainty. Nevertheless, efficient recollection does not necessarily close the loop if the recovered products do not enter into the main stream of the supply network. Beside, products that are distributed through separate channels create an open loop. Thus, the problem of uncertainty remains unsolved. The aim of this paper is to propose solutions to minimize the uncertainty involved in designing a well-functioning closed-loop supply network using the system dynamics principle and tool.

  • 165.
    Abdullah Asif, Farazee Mohammad
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology.
    Semere, Daniel Tesfamariam
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Nicolescu, Cornel Mihai
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    Haumann, M.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    METHODS ANALYSIS OF REMANUFACTURING OPTIONS FOR REPEATED LIFECYCLE OF STARTERS AND ALTERNATORS2010In: 7th International DAAAM Baltic Conference"INDUSTRIAL ENGINEERING"22-24 April 2010, Tallinn, Estonia / [ed] R. Kyttner, Estonia: Tallinn University of Technology , 2010, 340-345 p.Conference paper (Refereed)
    Abstract [en]

    The Design for Repeatedly Utilization (DFRU) is a proposed conceptto be used in the product realizationprocess to ensure optimum useable life (forinstance in terms of economy, resourceusage, environmental impact etc.) ofproducts or parts of products enablingmultiple lifecycle. In the DFRU approachproducts are restored as new like productsthrough remanufacturing processes. Theterm remanufacturing has been interpreteddifferently by different researchers and theindustries that are involved inremanufacturing business use differentapproaches to remanufacture theirproducts. In this paper the starter motorand alternator of automotives has beenused to demonstrate the novel concepts.The purpose of this paper is to expresswhat remanufacturing means in ourconcept, model their major lifecycleaspects and create a simulation modelfrom it. This is a preliminary work towardsdefining and specifying the processes,methods and design properties in DFRU.The work will be further extended to aholistic business model which can facilitateDFRU approach in an efficient way. Infuture the model will be developed andadopted to create new models for otherproducts appropriate for remanufacturingand eventually DFRU.

  • 166.
    Abdullah, Maizura Ailin
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Öhrwall Rönnbäck, A
    Ölundh Sandström, Gunilla
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Building Networks for Delivering Integrated Product-Service Offerings (IPSOs)2010Conference paper (Refereed)
  • 167.
    Abdullah, Nazri
    et al.
    Universiti Tun Hussien Onn Malaysia, Malaysia .
    Kounelis, Ioannis
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Muftic, Sead
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.
    Security Extensions for Mobile Commerce Objects2014In: SECURWARE 2014, The Eighth International Conference on Emerging Security Information, Systems and Technologies, 2014Conference paper (Refereed)
    Abstract [en]

    Electronic commerce and its variance mobile commerce have tremendously increased their popularity in the last several years. As mobile devices have become the most popular mean to access and use the Internet, mobile commerce and its security are timely and very hot topics. Yet, today there is still no consistent model of various m–commerce applications and transactions, even less clear specification of their security. In order to address and solve those issues, in this paper, we first establish the concept of mobile commerce objects, an equivalent of virtual currencies, used for m–commerce transactions. We describe functionalities and unique characteristics of these objects; we follow with security requirements, and then offer some solutions – security extensions of these objects. All solutions are treated within the complete lifecycle of creation and use of the m–commerce objects.

  • 168.
    Abdullah, Rondek
    KTH, School of Chemical Science and Engineering (CHE).
    Study of the Eutrophication of Lake Vallentuna2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Lake Vallentuna is situated 20 km north of Stockholm, in Täby and Vallentuna municipalities. It is a shallow eutrophicated lake, with a maximum depth of 6, 0 meter and the turnover time of the lake is 1, 6 years. Lake Vallentuna has two inlets, which are Ormstaån in the North and Karbyån in the South. The outlet from Lake Vallentuna is Hagbyån in the South-West. Lake Vallentuna is, due to human activities, influenced by many contaminants, for example phosphorus and nitrogen, which contribute to the eutrophication.

    The natural state of Lake Vallentuna involves a high phosphorus concentration, since it is a lake among fields dominated by clay. The increased phosphorus levels depend on various sources, such as sewage, agriculture, and storm water.

    The aim of this project is to describe the present state of the lake and to predict the future changes. This report will also give phosphorus and calcium levels determined for Lake Vallentunna. By the examination of the chemical and physical parameters we could estimate the contribution of pollutants. To assess the lake condition, an excursion was made to collect samples and perform measurements in the field. The samples were collected from twelve different sites.

    The eight parameters measured in this study are conductivity, temperature, pH, COD, chlorinity, alkalinity, calcium and total phosphorus. The assessment of the lake was based on the guidelines from the Swedish Environmental Protection Agency ”Bedömningsgrunder för miljökvalitet”. We compared the measured values with those in the guidelines. One conclusion is that the Lake is heavily eutrophicated.

    Our measurements indicate that the incoming amount of phosphorus is bigger than the outgoing amount of phosphorus, which means that the amount of phosphorus in the lake increases at the time for the measurements. However, the main source of phosphorus in the lake water is the internal contribution from the sediments, which have been accumulated during many years. The measured values of phosphorus show that the lake is eutrophicated.

    Lake Vallentuna contains big amounts of phosphorus and metal ions (see also Adam Kazi’s diploma work on metal ions in Lake Vallentuna[19] ). The reason is that the lake is situated in a very contaminated area.

  • 169.
    Abdulrahman, Keiwan
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Potrus, Fadi
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Numerical analysis and model updating of a steel-concrete composite bridge: Parametric study & Statistical evaluation2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the year 2006, only 10 years after the steel- concrete composite bridge, Vårby bridge was built, fatigue cracks were found during an inspection. To further investigate the reasons and the potential danger of the cracks, an investigation under the commission of the Swedish Transport Administration was issued in 2009. After the detection of fatigue cracks, several measurements were carried out in order to monitor the static behavior by the use of strain gauges at selected positions along the bridge. The measurements from the strain gauges monitoring the global behavior were then used to calibrate an finite element model.

     

    The present report is part of the research of understanding the behavior of steel-concrete composite bridges. Numerical analysis and model updating have been used in order to understand and determine how different parameters affects the strain range and the global behavior. The numerical analysis and parameter study were performed in the Finite Element software Abaqus and programming language Python. The outcome of the parameter study was then used to perform the model updating by the method of falsification in MATLAB.

     

    The results from the parameter study and the model updating showed that the measured strains could be reached with a wide range of parameter combinations. Even with unreasonable parameter values, the measured strains were obtained. To investigate the reason for this, a multiple linear regression analysis was performed which showed that the strain range is strongly correlated to the Young’s modulus of steel and concrete and also to the connector elasticity, which resembles the studs in the real bridge.

     

    Two different finite element models, with two completely different input parameter values, obtain the same strain range for the global behavior. It is therefore not certain to assume that a model is accurate and valid based on the fact that the predicted strain range from the finite element model is close to the measured strain range since the global behavior of a steel- concrete composite bridge can be modeled by many different sets of parameters.

  • 170.
    Abebe, Zelalem Teffera
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Process Control over Wireless Sensor Networks2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A signicant growth was witnessed in the led of Wireless Sensor Networks (WSNs), the previous decade. Advances in hardware miniaturization coupled with increased processing capabilities and memory capacity have extended the application domains of WSNs. In light of this, standardization organizations led by academia and industries initiated activities for the design of protocols such as IEEE 802.15.4 and IETF RPL (Routing Protocol for Low power and Lossy Networks). IEEE 802.15.4 denes physical and media access layers for WSNs while IETF RPL denes the functionality of the routing layer.

    This thesis investigates research issues in wireless sensor networks and network controlled systems that control micro-biological processes for water treatment plants. By choosing a process model that can relate to an industrial process, feasibility of control over IEEE 802.15.4 and RPL protocols is evaluated for stability with regards to network delay and packet loss. Settling time and overshoot are measured to indicate control performance. Control messages related to routing and routing table lengths are measured to indicate network stability and scalability. The system model used is a centralized discrete controller controlling a thermal processes running on the sensors. This model is chosen for representing wide industrial networked control systems while adding a WSN dimension based on IEEE 802.15.4 and RPL. The main contribution of this thesis is an experimental study where both the network and controller performance is validated while utilizing commercial o-theshelf sensor platforms. The results from this experimental work include rst the use of established theorems for analyzing control using WSNs. Moreover, the ability of IEEE 802.15.4 and RPL to provide stable communication that is reliable enough for actual industrial control implementation is validated.

  • 171.
    Abed, Kason
    KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
    FEM-analys av torkapparat2011Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 172.
    Abed, Mohamad Samir
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Hosseinzade, Azita
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
    Parameterstyrd projektering av broar: Koppling mellan Rhinoceros-Grasshopper och Tekla Structures2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    New methods for project designing in the building construction industry have been developed by introducing modern and powerful BIM tools. Several of today’s constructions are designed according to three-dimensional principles.Tekla Structures is a powerful BIM tool that is capable of managing both house and infrastructure constructions. Despite this, the program cannot handle bridges with a horizontal and vertical curvature efficiently. The designers must instead rely on several other applications to manage complex bridge constructions.In order to use the advantages of Tekla Structures, the software needs to be evolved or complimented by other third party softwares. This project aims to integrate new working technics and introduce a method based on parametric design in Tekla Structures. Such form of modeling enables the modification of parameters to a desired model for the user.A script is created through a visual programming extension that generates a parametric based bridge models. The bridge type in this project was designed, is an integral bridge.The project has proved that parametric based design is more effectively and a solution to manage bridges with horizontal and vertical curvature.

  • 173. Abedan Kondori, Farid
    et al.
    Yousefi, Shahrouz
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID. Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
    Smart Baggage in Aviation2011In: Proceedings - 2011 IEEE International Conferences on Internet of Things and Cyber, Physical and Social Computing, 2011Conference paper (Refereed)
    Abstract [en]

    Nowadays, the Internet has dramatically changed the way people take the normal course of actions. By the recent growth of the Internet, connecting different objects to users through mobile phones and computers is no longer a dream. Aviation industry is one of the areas which have a strong potential to benefit from the Internet of Things. Among many problems related to air travel, delayed and lost luggage are the most common and irritating. Therefore, this paper suggests anew baggage control system, where users can simply track their baggage at the airport to avoid losing them. Attaching a particular pattern on the bag, which can be detected and localized from long distance by an ordinary camera, users are able to track their baggage. The proposed system is much cheaper than previous implementations and does not require sophisticated equipment.

  • 174. Abedan Kondori, Farid
    et al.
    Yousefi, Shahrouz
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID.
    Li, Haibo
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID.
    Direct Head Pose Estimation Using Kinect-type Sensors2014In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911XArticle in journal (Refereed)
  • 175. Abedan Kondori, Farid
    et al.
    Yousefi, Shahrouz
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID.
    Liu, Li
    Li, Haibo
    KTH, School of Computer Science and Communication (CSC), Media Technology and Interaction Design, MID. Nanjing University of Posts and Telecommunications, Nanjing, China .
    Head Operated Electric Wheelchair2014In: Proceedings of the IEEE Southwest Symposium on Image Analysis and Interpretation, 2014, 53-56 p.Conference paper (Refereed)
    Abstract [en]

    Currently, the most common way to control an electric wheelchair is to use joystick. However, there are some individuals unable to operate joystick-driven electric wheelchairs due to sever physical disabilities, like quadriplegia patients. This paper proposes a novel head pose estimation method to assist such patients. Head motion parameters are employed to control and drive an electric wheelchair. We introduce a direct method for estimating user head motion, based on a sequence of range images captured by Kinect. In this work, we derive new version of the optical flow constraint equation for range images. We show how the new equation can be used to estimate head motion directly. Experimental results reveal that the proposed system works with high accuracy in real-time. We also show simulation results for navigating the electric wheelchair by recovering user head motion.

  • 176.
    Abedi, Ali
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Falk, Sebastian
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Motivation på byggarbetsplatsen2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Working as a craftsman on a construction site is a demanding job, both physically and psychologically. Tight schedules, hard conditions or challenging task awaits the craftsman each new working day. In order to complete a successful project the craftsmen are required to perform high results and show great commitment to their work. Motivation is thereby a key factor and a necessity for every successful project. The following study will investigate how the site management motivates their craftsmen and also how motivation can contribute to more successful construction projects.

    The study is based upon literature covering motivation, leadership and groups. Also, quantitative and qualitative studies have been performed in the form of personal interviews and surveys. The study has been performed on three similarly construction projects, all belong to Peab bostad. Each site manager has been interviewed and the craftsmen have participated in a survey. The craftsmen experienced that their salary was the biggest source of motivation. Other softer factors such as fellowship and appreciation were also important, though not in the same extent as the monetary rewards. The site management shared the craftsmen’s opinions; however one common thought was that the softer factor would have bigger influence on the motivation.

    The result of the study clearly shows that the salary is and remains a big factor of motivation for the craftsmen. However the key to high and long ‐standing motivation lies within the development of the softer factors. The study shows that a high motivation leads to a higher well‐being and commitment to the project. This contributes in making the projects more profitable and thereby successful.

    To obtain this high motivation effort and planning from the site management is required. The implementation of daily rounds on the site has shown to be an effective way to enhance the motivation. During these rounds the site manger discusses problems and plans upcoming tasks in an informal manner. When the craftsmen feel noticed, appreciated and that their ideas can influence the project their motivation will enhance. The site manager also needs to create opportunities for the craftsmen so they can continue to perform on a high level and give them the liberty to control their own work. The study can be summed up in that freedom under responsibility, appreciation, participation, thoughtful planning and a high salary are the main factors that will create a high long lasting motivation amongst the crafts men

  • 177.
    Abedi, Aref
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Wallsten, Jakob
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Beslutsfattande inom Produktutveckling: Kartläggning, analysering & vidareutveckling av PPM process på ett medtech företag2009Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The number of ideas at innovative companies usually exceeds the amount of available human or

    material recourses, this include ideas for development of new products. Since they are not able to do

    everything they want to do they have to choose between ideas to develop new products. This includes

    the decision on when to start, stop or kill a project as well as the thought process of prioritizing between

    ongoing and potential projects.

    Project Portfolio Management (PPM) is an organizational process, with the purpose of systematically

    organizing and running the activities that aim to evaluate, select and prioritize ideas and projects for

    developing new products. PPM include four major goals to be fulfilled; Maximizing Value of the

    Portfolio, Achieving a Balanced Portfolio, Achieving a Strategic Alignment and Running the Right

    Number of Projects.

    The purpose of the thesis was to develop a more visual and formal PPM process for the early stages in

    product development in one department at St Jude Medical AB, Sweden.

    The thesis was conducted by following a methodology known as Process Modules. The methodology is

    an approach for developing a PPM process that fits a specific company. The methodology is not a

    defined work procedure for decision making but rather a systematic method for developing one.

    The thesis was conducted by working closely with a defined Work Group consisting of six decision

    makers at St Jude Medical AB, Sweden. Initially, the authors managed to map the current PPM process

    at the department in focus which showed to be rather informal and not using formal criteria. Together

    with the Work Group, the process was formalized and visualized. During a workshop, a set of selection

    criteria were identified and defined, and so was a set of balance criteria. Finally, the new PPM process

    was defined and visualized by the authors.

    A number of overall important reflections were concluded by the authors after conducting this master

    thesis. The main reflection is the fact that every PPM process is, and needs to be, company specific.

    Further on, when developing a PPM process it is of great importance to involve management and

    involved staff in the actual procedure, in order to increase the understanding of the final process.

  • 178.
    Abedin, Ahmad
    et al.
    KTH, School of Information and Communication Technology (ICT), Elektronics, Integrated devices and circuits.
    Asadollahi, Ali
    KTH, School of Information and Communication Technology (ICT), Elektronics, Integrated devices and circuits.
    Garidis, Konstantinos
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Hellström, Per-Erik
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Östling, Mikael
    KTH, School of Information and Communication Technology (ICT), Elektronics.
    Epitaxial growth of Ge strain relaxed buffer on Si with low threading dislocation density2016In: ECS Transactions, Electrochemical Society, 2016, no 8, 615-621 p.Conference paper (Refereed)
    Abstract [en]

    Epitaxial Ge with low dislocation density is grown on a low temperature grown Ge seed layer on Si substrate by reduced pressure chemical vapor deposition. The surface topography measured by AFM shows that the strain relaxation occurred through pit formation which resulted in freezing the defects at Ge/Si interface. Moreover a lower threading dislocation density compared to conventional strain relaxed Ge buffers on Si was observed. We show that by growing the first layer at temperatures below 300 °C a surface roughness below 1 nm can be achieved together with carrier mobility enhancement. The different defects densities revealed from SECCO and Iodine etching shows that the defects types have been changed and SECCO is not always trustable.

  • 179.
    Abedin, Ahmad
    et al.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Moeen, Mahdi
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Cappetta, Carmine
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Östling, Mikael
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Radamson, Henry H.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Sensitivity of the crystal quality of SiGe layers grown at low temperatures by trisilane and germane2016In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 613, 38-42 p.Article in journal (Refereed)
    Abstract [en]

    This work investigates the crystal quality of SiGe layers grown at low temperatures using trisilane, and germane precursors. The crystal quality sensitivity was monitored for hydrogen chloride and/or minor oxygen amount during SiGe epitaxy or at the interface of SiGe/Si layers. The quality of the epi-layerswas examined by quantifying noise parameter, K-1/f obtained from the power spectral density vs. 1/f curves. The results indicate that while it is difficult to detect small defect densities in SiGe layers by physical material characterization, the noise measurement could reveal the effects of oxygen contamination as low as 0.16mPa inside and in the interface of the layers.

  • 180.
    Abedin, Ahmad
    et al.
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Noroozi, Mohammad
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
    Primetzhofer, Daniel
    Östling, Mikael
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    Radamson, Henry.H
    KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
    GeSnSi CVD Epitaxy using Silane, Germane, Digermane, and Tin tetrachlorideArticle in journal (Refereed)
    Abstract [en]

    In this study, strain relaxed and compressive strained Ge1-x-ySnxSiy (0.015≤x≤0.15 and 0≤y≤0.15) layers were epitaxially grown on Si substrate in a chemical vapor deposition reactor at atmospheric pressure. Digermane (Ge2H6) and germane (GeH4) were used as Ge precursors and tin tetrachloride (SnCl4) was used as Sn precursor. The growth temperature was kept below 400ᵒC to suppress Sn out diffusion. The layers crystal quality and strain were characterized using XRD, high resolution reciprocal lattice mapping and transmission electron microscopy and the surface morphology was investigated by atomic force microscopy (AFM). Furthermore, the low temperature epitaxial growth up to 15% Si atoms incorporation in Ge0.94Sn0.06 was demonstrated by adding silane (SiH4) as Si precursor. Sn contents calculated from high resolution XRD patterns were confirmed by Rutherford backscattering spectroscopy which shows that Sn atoms are mostly positioned in substitutional sites. AFM analysis showed below 1nm surface roughness for both strained and strain relaxed GeSn layers which make the promising materials for photonics and electronics applications.

  • 181.
    Abedini, Pegah
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Lag 2010:879 om allmännyttiga kommunala bostadsaktiebolag: Hur den implementerats av aktörerna2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Bakgrund:

    Den första januari 2011 trädde lagen om allmännyttiga kommunala bostadsaktiebolag i kraft. Dess ändamål var att jämställa konkurrensen sinsemellan de privata fastighetsägarna och de allmännyttiga kommunala bostadaktiebolagen. Lagen yrkade främst på att de allmännyttiga kommunala bostadsaktiebolagen skulle agera mer affärsmässigt för att konkurrensen inte skulle snedvridas. Kommunen som ägare var bland annat tvungen att ställa tydligare krav på bolagen genom att ta ut marknadsmässiga borgensavgifter och låneräntor samt ställa marknadsmässiga avkastningskrav.

    Frågan är nu hur de allmännyttiga kommunala bostadsaktiebolagen agerat utifrån dessa nya förutsättningar sedan lagen trädde i kraft den 1 januari 2011. Uppsatsen syftar till att undersöka hur den nya lagen om allmännyttiga kommunala bostadsaktiebolag har implementerats av aktörerna på bostadshyresmarknaden. Målet med uppsatsen är att klarlägga konsekvenserna av lagen för aktörerna på bostadshyresmarknaden, tydliggöra dess implikationer för beslutsfattare i de kommunala bostadsaktiebolagen samt kunna ge kommunerna bättre underlag i besluten rörande sina bolag.

    Metod:

    Enkätstudie där vd:ar från allmännyttiga kommunala bostadsaktiebolag har tillfrågats angående bolagets och kommunens agerande och inställning sedan lagen ikraftträdde.

    Avgränsning:

    Enkätstudien har avgränsats till att omfatta vd:ar på kommunala bostadsaktiebolag i Sverige, rörande händelser som inträffat sedan den 1 januari 2011. Vd:ar på bolag belägna i Stockholms Län, Uppsala län, Södermanlands Län, Östergötlands Län, Jönköpings Län samt Västra Götalands Län har medverkat i enkäten.

    Resultat och slutsats:

    De kommunala allmännyttiga bostadsaktiebolagen instämmer allmänt i att de agerar mer affärsmässigt sedan den nya lagen introducerades. Avkastningskraven i ägardirektiven har setts över, och de kommunala borgens– och ränteavgifterna har generellt sett ökat sedan lagen trädde i kraft.

  • 182. Abel, S
    et al.
    Bäbler, Matthäus
    ETH, Inst Chem & Bioengn, Dept Chem & Appl Biosci.
    Arpagaus, C
    Mazzotti, M
    Stadler, J
    Two-fraction and three-fraction continuous simulated moving bed separation of nucleosides2004In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1043, no 2, 201-210 p.Article in journal (Refereed)
    Abstract [en]

     A new experimental set-up and a new simulated moving bed (SMB) operation are presented in this work. A desktop SMB unit developed as a modification of the commercial AKTA(TM) explorer working platform has been utilized for the separation of different mixtures of nucleosides. Both two fraction and three fraction SMB separations have been carried out, the latter made possible by the adoption of a new SMB configuration and operating mode (three fraction SMB, 3F-SMB, operation). Experiments demonstrate the feasibility of the 3F-SMB operation, and confirm the trends predicted based on considerations about retention of the components to be separated along the unit. 

  • 183.
    Abela,, Eric
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Davidsson, Rasmus
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Flexibility in the Office Market – A casestudy of the serviced office space ofGarnisonen2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The market for serviced office space has gone from previously solely consisting of premises in poor

    locations and of poor standards to presently consisting of a wide spectrum of properties ranging in

    location, standard and level of service. As the demand for flexibility increases in society, the serviced

    office space has become an increasingly greater part of the total office market and an important

    complement to the ordinary office market, in order to stimulate growth for smaller companies.

    The aim of this thesis is to investigate how the demand for serviced office space in B-locations in

    Stockholm is shaped and how important different factors are for businesses when choosing serviced

    office space. With this in mind we will then form a recommendation for how the serviced office space

    “Garnisonen” should be positioned on the market.

    To answer these questions a case study of Garnisonen serviced office space was conducted. Data has

    been collected through interviews, surveys and a literature review.

    Through our work we found that tenants that chose serviced office spaces in B-locations in Stockholm

    put the highest value in flexibility, simplicity, and the possibility to lease a fully functional office with

    only a few places.

    The physical environment isn’t the primary factor for success of serviced office space in B-locations in

    Stockholm. One of the most important factors for success, and to achieve tenant satisfaction, of serviced

    office space is to create a platform for networking between different companies and to create a social

    place where the companies can meet, which furthers their collective growth.

  • 184.
    Abela, Eric
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Qattan, Nessrin
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management.
    Transaktioner på den kommersiella fastighetsmarknaden 2011: Trender och fallstudier2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta examensarbete är att kartlägga några av de största transaktionerna på den svenska fastighetsmarknaden under 2011. Detta år har kännetecknats av lägre transaktionsvolym än föregående år, bland annat på grund av ett osäkrare ekonomiskt läge.

    Teorin har sin utgångspunkt i vilka aktörer som finns på marknaden och vilken roll konsulten, utländska investerare och banker spelar samt hur utvecklingen av fastighetstransaktions marknaden i Sverige sett ut fram tills idag. Kartläggningen har gjorts på sätt att försöka få med de flesta typer av aktörer och utreda varje transaktion för sig samt ge en närmare analys av dessa.

    Kartläggningen visar att de största transaktionerna i Sverige under 2011 gjordes av både noterade och onoterade fastighetsbolag på köpsidan, samt onoterade fastighetsbolag på säljsidan.

    Att döma av fjolårets utveckling marknadsmässigt pekar en hel del på att den kraftiga tillväxten i Sverige kommer att leda till mer arbetstillfällen, med fallande vakanser och stigande hyror som konsekvens på den svenska fastighetsmarknaden.

  • 185.
    Abele, Andreas
    et al.
    Continental Gmbd, Germany.
    Johansson, Rolf
    SP.
    Lönn, Henrik
    Volvo Technology AB.
    Papadopoulos, Yiannis
    Hull University, UK.
    Reiser, Mark-Oliver
    Technical Univ of Berlin.
    Servat, David
    CEA, France.
    Törngren, Martin
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Embedded Systems.
    Weber, Matthias
    Technische Universit¨at Berlin, DE.
    The CVM framework: A prototype tool for compositional variability management2010In: Proceeding of: Fourth International Workshop on Variability Modelling of Software-Intensive Systems, 2010, 101-105 p.Conference paper (Refereed)
    Abstract [en]

    This article announces the first public release ofan experimental research tool for variability management,called “CVM framework” and provides an overview of thetool’s capabilities and architecture.

  • 186.
    Abelin, Sarah
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Investigation of integrated waterlevel sensor solution forsubmersible pumps: A study of how sensors can be combined towithstand build-up materials and improvereliability in harsh environment2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Monitoring water level in harsh environment in order to handle the start and stop function of drainage pumps has been a major issue. Several environmental factors are present, which affect and disturb sensor measurements. Current solutions with mechanical float switches, mounted outside of pumps, wear out, get entangled and account for more than half of all the emergency call outs to pumping stations. Since pumps are frequently moved around, a new sensor solution is needed which can be integrated within the pump house and is able to continuously monitor water level to optimize the operation of the pump and to decrease wear, cost and energy consumption.

    This thesis presents an investigation how different sensor techniques can be combined to improve reliability for monitoring water level and handle the start and stop function of drainage pumps in harsh environment. The main focus has been to identify suitable water level sensing techniques and to investigate how sensors are affected by build-up materials building up on the pump surface and covering the sensor probes. A support vector machine algorithm is implemented to fuse sensor data in order to increase reliability of the sensor solution in contaminated condition.

    Results show that a combination of a pressure sensor and a capacitive sensor is the most suitable combination for withstanding build-up materials. For operating conditions when sensors are covered with soft or viscous build-ups, sensors were able to monitor water level through the build-up materials. No solution was found that could satisfactorily monitor water level through solidified build-up materials.

  • 187.
    Abella, Tricia Jennifer
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    The Creative Approach to Vanguard Projects2011Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A vanguard project is the firm’s entrepreneurial vehicle for exploring opportunities, creating new products, services or markets. This type of projects requires flexibility and innovation to thrive. In this regard, a creative approach to project management is proposed for the successful execution of such projects. This creative approach is summarized in a framework that consists of two main components – flexible planning and creative climate.

    The Central Services project, a vanguard in telecommunications, was used to benchmark the creative project management framework to the current project management methodology of the IT department of TIWS. Results show that there is a gap between the framework and the status quo. Moreover, the Central Services project is not efficiently and effectively managed, therefore, resulting to project delays which consequentially lead to negative company revenues. This reality strengthens the proposition that vanguard projects should be managed differently; hence, the birth of creative project management.

  • 188. Aberer, Karl
    et al.
    Alima, Luc Onana
    Ghodsi, Ali
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Girdzijauskas, Sarunas
    Ecole Polytechnique Fédérale de Lausanne.
    Haridi, Seif
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Hauswirth, Manfred
    The Essence of P2P: A Reference Architecture for Overlay Networks2005In: Fifth IEEE International Conference on Peer-to-Peer Computing, Proceedings / [ed] Caronni, G; Weiler, N; Waldvogel, M; Shahmehri, N, 2005, 11-20 p.Conference paper (Refereed)
    Abstract [en]

    The success of the P2P idea has created a huge diversity of approaches, among which overlay networks, for example, Gnutella, Kazaa, Chord, Pastry, Tapestry, P-Grid, or DKS, have received specific attention from both developers and researchers. A wide variety of algorithms, data structures, and architectures have been proposed. The terminologies and abstractions used, however have become quite inconsistent since the P2P paradigm has attracted people from many different communities, e.g., networking, databases, distributed systems, graph theory, complexity theory, biology, etc. In this paper we propose a reference model for overlay networks which is capable of modeling different approaches in this domain in a generic manner It is intended to allow researchers and users to assess the properties of concrete systems, to establish a common vocabulary for scientific discussion, to facilitate the qualitative comparison of the systems, and to serve as the basis for defining a standardized API to make overlay networks interoperable.

  • 189. Abermann, S.
    et al.
    Efavi, J. K.
    Sjoblom, G.
    Lemme, Max C.
    AMO GmbH, AMICA, Aachen, Germany.
    Olsson, J.
    Bertagnolli, E.
    Processing and evaluation of metal gate/high-kappa/Si capacitors incorporating Al, Ni, TiN, and Mo as metal gate, and ZrO2 and HfO2 as high-kappa dielectric2007In: Microelectronic Engineering, ISSN 0167-9317, E-ISSN 1873-5568, Vol. 84, no 5-8, 1635-1638 p.Article in journal (Refereed)
    Abstract [en]

    We evaluate various metal gate/high-K/Si capacitors by their resulting electrical characteristics. Therefore, we process MOS gate stacks incorporating aluminium (Al), nickel (Ni), titanium-nitride (TiN), and molybdenum (Mo) as the gate material, and metal organic chemical vapour deposited (MOCVD) ZrO2 and HfO2 as the gate dielectric, respectively. The influence of the processing sequence - especially of the thermal annealing treatment - on the electrical characteristics of the various gate stacks is being investigated. Whereas post metallization annealing in forming gas atmosphere improves capacitance-voltage behaviour (due to reduced interface-, and oxide charge density), current-voltage characteristics degrade due to a higher leakage current after thermal treatment at higher temperatures. The Flatband-voltage values for the TiN-, Mo-, and Ni-capacitors indicate mid-gap pinning of the metal gates, however, Ni seems to be thermally unstable on ZrO2, at least within the process scheme we applied.

  • 190. Abermann, S.
    et al.
    Efavi, J.
    Sjoblom, G.
    Lemme, Max C.
    AMO GmbH, AMICA, Aachen, Germany.
    Olsson, J.
    Bertagnolli, E.
    Impact of Al-, Ni-, TiN-, and Mo-metal gates on MOCVD-grown HfO2 and ZrO2 high-k dielectrics2007In: Microelectronics and reliability, ISSN 0026-2714, E-ISSN 1872-941X, Vol. 47, no 4-5, 536-539 p.Article in journal (Refereed)
    Abstract [en]

    In this work we compare the impacts of nickel (Ni), titanium-nitride (TiN), molybdenum (Mo), and aluminium (Al), gates on MOS capacitors incorporating HfO2- or ZrO2-dielectrics. The primary focus lies on interface trapping, oxide charging, and thermodynamical stability during different annealing steps of these gate stacks. Whereas Ni, Mo, and especially TIN are investigated as most promising candidates for future CMOS devices, Al acted as reference gate material to benchmark the parameters. Post-metallization annealing of both, TiN- and Mo-stacks, resulted in very promising electrical characteristics. However, gate stacks annealed at temperatures of 800 degrees C or 950 degrees C show thermodynamic instability and related undesirable high leakage currents.

  • 191. Abermann, S.
    et al.
    Sjoblom, G.
    Efavi, J.
    Lemme, Max C.
    AMO GmbH, AMICA, Aachen, Germany.
    Olsson, J.
    Bertagnolli, E.
    Comparative study on the impact of TiN and Mo metal gates on MOCVD-grown HfO2 and ZrO2 high-kappa dielectrics for CMOS technology2007In: Physics of Semiconductors, Pts A and B, 2007, 293-294 p.Conference paper (Refereed)
    Abstract [en]

    We compare metal oxide semiconductor capacitors, investigating Titanium-Nitride and Molybdenum as gate materials, as well as metal organic chemical vapor deposited ZrO2 and HfO2 as high-kappa dielectrics, respectively. The impact of different annealing steps on the electrical characteristics of the various gate stacks is a further issue. The positive effect of post metallization annealing in forming gas atmosphere as well as observed mid-gap pinning of TiN and Mo metal gates is presented.

  • 192.
    Abeywardana, Asela M.A.J.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Solar-Biomass hybrid system for process heat supply in medium scale hotels in Sri Lanka2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study aimed at evaluating and demonstrating the feasibility of using Concentrated Solar Thermal technology combined with biomass energy technology as a hybrid renewable energy system to supply the process heat requirements in small scale industries in Sri Lanka. Particularly, the focus was to apply the concept to the expanding hotel industry, for covering the thermal energy demand of a medium scale hotel.

    Solar modules utilize the rooftop area of the building to a valuable application. Linear Fresnel type of solar concentrator is selected considering the requirement of the application and the simplicity of fabrication and installation compared to other technologies. Subsequently, a wood-fired boiler is deployed as the steam generator as well as the balancing power source to recover the effects due to the seasonal variations in solar energy. Bioenergy, so far being the largest primary energy supply in the country, has a good potential for further growth in industrial applications like small hotels. 

    When a hotel with about 200-guests capacity and annual average occupancy of 65% is considered, the total annual CO2 saving is accounted as 207 tons compared with an entirely fossil fuel (diesel) fired boiler system. The annual operational cost saving is around $ 40,000 and the simple payback period is within 3-4 years. The proposed hybrid system can generate additional 26 employment opportunities in the proximity of the site location area.  

    This solar-biomass hybrid concept mitigates the weaknesses associated with these renewable technologies when employed separately. The system has been designed in such a way that the total heat demand of hot water and process steam supply is managed by renewable energy alone. It is thus a self-sustainable, non-conventional, renewable energy system. This concept can be stretched to other critical medium temperature applications like for example absorption refrigeration. The system is applicable to many other industries in the country where space requirement is available, solar irradiance is rich and a solid biomass supply is assured.

  • 193. Abeyweera, Ruchira
    et al.
    Senanayake, Nihal S.
    Senaratne, Chamindie
    Jayasuriya, Jeevan
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. EIT InnoEnergy, Sweden.
    Fransson, Torsten H.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. EIT InnoEnergy, Sweden.
    Capacity Building Through a Web Based Master Degree Programme in Sustainable Energy Engineering2017In: PROCEEDINGS OF 2017 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON2017), IEEE, 2017, 800-805 p.Conference paper (Refereed)
    Abstract [en]

    Open Distance Learning is gaining popularity as a successful alternative for on-campus higher education especially with the emergence of web based platforms which enable the online delivery of courses worldwide. This emerging educational pedagogy can successfully be employed as means of capacity building of the people living in the less fortunate parts of the world where higher education especially at master level are scarce. This paper presents a two-year collaborative master study programme in sustainable energy engineering offered in synchronous with an on-campus study programme conducted by the KTH Royal Institute of Technology of Sweden, to students of Sri Lanka, which was facilitated by the Open University of Sri Lanka. The paper describes the need of such a programme, the format of course delivery and assessment thereof, plus the benefits gained. This programme has produced 72 post graduates in Sri Lanka alone and more than 200 distant postgraduates worldwide in the field of sustainable energy engineering during last 10 years period. In terms of capacity building in the energy sector in Sri Lanka this is considered a great achievement. The experience gained by the local staff in the role of local facilitators who engaged in some of the academic related activities such as evaluation of students' presentation and co-supervision of thesis projects have been greatly appreciated as being additional benefits to the staff in terms of their own academic development and capacity building. Finally, conclusions are made on how remote programmes of study could successfully be delivered to places where such know-how is scarce by adapting appropriate technologies in training personnel at postgraduate level to meet the needs of the industry.

  • 194. Abeywickrama, Sandu
    et al.
    Furdek, Marija
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Wong, Elaine
    Protecting core networks with dual-homing: A study on enhanced network availability, resource efficiency, and energy-savings2016In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 381, 327-335 p.Article in journal (Refereed)
    Abstract [en]

    Core network survivability affects the reliability performance of telecommunication networks and remains one of the most important network design considerations. This paper critically examines the benefits arising from utilizing dual-homing in the optical access networks to provide resource-efficient protection against link and node failures in the optical core segment. Four novel, heuristic-based RWA algorithms that provide dedicated path protection in networks with dual-homing are proposed and studied. These algorithms protect against different failure scenarios (i.e. single link or node failures) and are implemented with different optimization objectives (i.e., minimization of wavelength usage and path length). Results obtained through simulations and comparison with baseline architectures indicate that exploiting dual-homed architecture in the access segment can bring significant improvements in terms of core network resource usage, connection availability, and power consumption.

  • 195.
    Abhijeet, Kumar
    KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630).
    Governing water pollution effectively: A comparative study of legal frameworks & their implementation in India & Sweden.2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Case studies from India have shown that the legal regime governing water pollution control in India has miserably failed. Sectoral approach to water management is quite evident. On the other hand Sweden has shown a remarkable change with regard to environment management. The poor management of a resource makes the resource further poor. Thus effective management of the resources becomes crucial. Good governance has been vital in conservation of a resource. But the issue is what constitutes good governance with respect to water? Law has always played a steering role in governance aspect. But despite having pollution control laws the effective governance of water pollution has not been attainable in India. Are the pollution control laws fundamentally wrong or some other factors prevail which is beyond the reach of law to control the pollution problem. The thesis which is a comparative study of legal framework and their implementation in India and Sweden attempts to explore how control of water pollution has been effectively governed in Sweden and what needs to been done in India.

  • 196.
    Abid, Fahim
    et al.
    KTH.
    Ghorbani, Hossein
    Pourrahimi, Amir Masoud
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Edin, Hans Ezz
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Differences in morphology and polarization properties of heat-treated XLPE and LDPE insulation2016In: 2016 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (IEEE CEIDP), IEEE conference proceedings, 2016, 113-116 p.Conference paper (Refereed)
    Abstract [en]

    Cross-linked polyethylene (XLPE) is the most commonly used insulating material for extruded high voltage cable applications. Degassing is a heat-treatment process that is performed to remove methane from XLPE insulation which is formed during the crosslinking reactions as a by-product. Apart from removing methane, heat-treatment influences the electrical properties through changing the morphology due to annealing and also removal of polar crosslinking by-products. Scanning electron microscopy (SEM) is generally used to observe the changes in crystalline structure of the polymer. Frequency domain spectroscopy (FDS) is widely used to study polarization properties of dielectric materials. In this study these two methods are used for a comparative analysis of XLPE and LDPE subjected to different heat-treatment time, with or without a diffusion barrier. Electrical measurements are performed at room temperature. From the SEM imaging conducted after permanganate acid etching, formation of spherulites due to heat-treatment is not obvious in neither LDPE nor in XLPE. However, distinctions between LDPE and XLPE in SEM micrographs are evident. From studies with dielectric polarization spectroscopy, it is found that the LDPE samples are less sensitive to heat-treatment in comparison to the XLPE samples while dissipation factor of XLPE samples are influenced by the choice of pressing film used during sample preparation.

  • 197.
    Abid, Muhammad
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Global Supply Chain Design: Exploring configurational and coordination factors2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis addresses the topic of global supply chain design. One major challenge concerns how to manage the tension between separation and integration pertaining to the localization of business activities. In this regard Ferdows (2008) worked to create two new production network models (rooted production network and footloose production network). Earlier studies have highlighted the choices that are involved in the network of facilities but lack in providing a comprehensive picture in terms of both configurational and coordination factors that govern the design of global supply chain. There is a need for a conceptual model where factors affecting the design process of a global supply chain can be applied. Two main research questions have been addressed in this study. First, exploring and identifying the factors affecting global supply chain design. Second, investigating the factors that influence the position on the spectrum of rooted and footloose supply chain design.      

    A literature review analysis and multi-case studies have been performed for this study in order to explore the factors. The companies were selected in order to reflect upon the two types of network, i.e., rooted and footloose. The primary data were selected through interviews with the managers.

    This study highlighted that there are many factors that affect configurational and coordination decision areas within a global supply chain. This study categorized the factors and the configurational/coordination decision areas with two main competitive priorities, i.e., cost and differentiation in the form of a “conceptual model.” The study also highlighted the factors in a matrix, which showed their position on the spectrum of rooted and footloose network configurations. For instance, the coordination factors that drive towards a footloose network include: high orchestration capabilities, need access to new technology and knowledge, proximity to suppliers, etc. The configurational factors that drive towards a rooted network include: economic stability, proximity to market, concerns for sustainability issues, high transportation cost, need for high proximity between key functions, need for intellectual property rights protection, etc.

  • 198.
    Abid, Muhammad
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.). Högskolan i Gävle, Sweden.
    Relationship between competitive priorities and global supply chain design: A conceptual frameworkManuscript (preprint) (Other academic)
  • 199.
    Abid, Muhammad
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.). Högskolan i Gävle, Sweden.
    Bengtsson, Lars
    Dabhilkar, Mandar
    Factors affecting shifts in global supply chain networks: A configurational approach2013In: Proceedings of the 20th International Annual EurOMA conference, Dublin, Ireland, 9-12 June 2013, 2013, 2013Conference paper (Refereed)
    Abstract [en]

    In certain situations, global companies strive to take advantage of short-term changes in economic and exchange rates on the never-ending journey of competitiveness. This paper seeks to extend Ferdows’s (2008) production network models by adding the factors affecting shifts between rooted and footloose network configurations. Two companies were selected in order to illustrate the models and reveal other possible factors. The identified factors are differentiated in terms of configuration and coordination and merged in a matrix. The trends and implications on global supply chains are also discussed.

  • 200.
    Abid, Muhammad
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.). Högskolan i Gävle, Sweden.
    Bengtsson, Lars
    Hellberg, Roland
    Dabhilkar, Mandar
    KTH, School of Industrial Engineering and Management (ITM), Industrial Economics and Management (Dept.).
    Factors affecting global supply chain design2012Conference paper (Refereed)
    Abstract [en]

    Due to the limited existing knowledge pertaining to the factors which govern localization of operations and capabilities in a global supply chain, the purpose of the paper is to find out which factors and how they jointly affect the design of global supply chains. The relevant literature is reviewed and a concept matrix is developed. Five companies were selected in order to illustrate the issues of global supply chain design. Among them, three companies are considered to have efficient supply chain and less complex products, while the two others are considered to have responsive supply chain and more complex products. The issues discussed with the selected companies cover global sourcing, challenges, technological advancement and issues related to management control. The study identifies about fifty factors that affect global supply chain design, and specifically how theses relate to design decisions on location of factories and production, supplier selection and development, distribution of products and organisation of interfaces along the supply chain. The discrepancies between theory and practice as well as the implications for further research are discussed.

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