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  • Lindelöf, Sofia
    KTH, School of Architecture and the Built Environment (ABE).
    Endurskógrækt: Tourism and Reforetsation in Iceland2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Research and thoughts on how tourism in Iceland can interact with and influence the icelandic nature in a positive way. The project focuses on the reforestation of Iceland and how buildings and architecture can invite tourists to have a positive effect on the island. The project combines the activity of hiking and the function of the tree nursery to result in a new kind of eco tourist. Where Tourists can become a helpful force to the Icelandic nature, planting one tree at a time. 

  • Larsson, Robin
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Småstadens Forum Futurum2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The most important resource is no longer the river, forest or mine - it is information, creativity and knowledge. Larger urban areas has transformed in to bigger cities with global perspectives, cities where we ́ve never before seen as much segregation and class differences. The smaller cities that once transformed Sweden from a poor peripheral nation to a country in the financial and social forefront, has been deprived of the possibility of being part of the knowledge economy. However, in this hierarchical transformation of the society the digitalization is forming a new type of center - an autonomous bomb goes off - and we all become our own center. This project explores the possibilities for a more decentralized society development, when the big cities is unable to deliver the perfect life setting for all.

    Smaller cities of the periphery is often beautifully situated and offers life qualities and spaces that many are longing for. Though, the last decades have been tough and left a lot of the smaller cities with a scattered and rough context – and a common lack of spaces to meet in. Therefore this project ended up becoming, what I imagine to be a new kind of symbolic building for meetings - that with its form, function and programme should express the new future of the periphery. The ambition is to introduce spaces which could act as a generator of a new time where the small towns get to be part of the knowledge economy, a time where people get to choose their own location of center through the tecnology of today. A future concept allowing the whole of Sweden to become more vibrant, connected to essential functions and filled with life - no matter the amount of people or the physical location of the place.

  • Lange, Johan
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Observation and Deduction2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Proposal for a student housing complex at Stockholm University Campus.

  • Kullmar, Andre
    KTH, School of Architecture and the Built Environment (ABE).
    An Alternative Plan for the Re-development of the Kathputli Colony, New Delhi2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This project is an alternative urban design scheme for the re-development of the Kathputli Colony in New Delhi, India. The Colony, approximately half the size of Gamla Stan, is located 30 minutes west of the City Centre and consist of a myriad of improvised dwellings. The residents of the colony are primarily artists, performers, craftsmen and puppeteers and have lived on the land since the 1970s.

    Now the land is set to be re-developed, directed jointly by the Delhi Municipality and a private developer, Rajeva, as part of the political initiative to turn Delhi into a “World-Class City”. The new scheme consists of two gated communities, a block of high-rises and a luxury skyscraper.

    The residents of the colony have been promised accommodation in the high-rise block, but have protested the proposal, and received a lot of media and scholarly attention. They argue that the new buildings with their small and isolated apartments do not cater to their needs. The existing landscape of dwellings which they themselves have constructed contain a number of different spatial qualities on which they depend to be able to continue they’re subsistence - Bazaar streets to sell their wares, courtyards to congregate with their families, squares on which to perform, roofs on which to sleep on during the hot summer months.

    I visited the colony twice on my two months journey around the country last semester. On the second visit, all of the dwellings had been demolished.

    The brief I have set for myself is to design a more exible and faceted alternative plan with new building stock that will able to cater both the needs of the ex-residents and the Indian middle class.

  • Krautzer, Sebastian
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    the endurance of the built form2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • Kinkel Martinoski, Marija
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Studentbostäder i Belgrad2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Belgrade is a growing European university city, today the largest in the Balkans. Up to 140,000 students share a total of 12,000 state-owned student homes. This growing trend will continue as the city and the country generally see economic growth greater than inprevious years.

    In an effort to respond to student housing shortages, I contribute with a proposal how to efficiently build for both students and the city. The site is centrally located at Bulevar kralja Aleksandra, which is Belgrade’s equivalent to Sveavägen. Until the fire in 2014 there was an indoor market on the site of what was previously a garage and turning point for the trams that go along the boulevard.

  • Junaeus, Philip
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    COP 25: An architectural proposal for the upcoming UNFCCC COP 25 climate talks, promoting sustainability and the global export of engineered timber from Sweden.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    An architectural proposal for the upcoming UNFCCC COP 25 climate talks, promoting sustainability and the global export of engineered timber from Sweden.

  • Hellman, Marcus
    et al.
    KTH, School of Engineering Sciences (SCI).
    Rapaport, Alfred
    KTH, School of Engineering Sciences (SCI).
    A new solution for sealing the deck of an autonomous sailboat2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Maribot Vane is an autonomous sailboat project at KTH Royal Institute of Technology. The use of autonomous boats is being recognised all over the world as a cost-efficient alternative to traditional manned ships for oceanographic research. Vane consists of an International 2.4 mR hull propelled by a self-adjusting wing that is controlled by a flap. A self-steering mechanism is currently under development. Field testing of the boat in the summer of 2017 showed that the boat was leaking where the mast enters the deck as well as through a hatch covering the former cockpit.

    This report deals with developing a new sealing solution to prevent water from entering the boat. It should be a durable and waterproof solution. Minimizing friction is of great importance to reduce interference with the self-adjusting wing. The problem is divided into two sub-problems: creating a sealing where the mast enters the boat and designing a new hatch. A housing made of 3D-printed plastic will be placed around the mast. By establishing models depicting “worst-case” scenarios calculations are done to determine how long the housing can stay submerged as well as how much impact it has to endure when being hit by a wave. Experiments are then performed on prototypes of the housing to determine how accurate the theoretical models are.

    A housing that theoretically can stay submerged for approximately three seconds is developed. Analysis suggests that it is durable enough to withstand the impact from being hit by a wave. A hatch consisting of two parts is also developed. One placed in the front where the mast goes through and one in the back that should be easy to open, providing access to the inner parts of the boat even when in water.

  • Missaghian, Pouyan
    KTH, School of Engineering Sciences (SCI).
    Dämpning av seismiska vågor2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this project is to calculate the attenuation of seismic waves passing through the Earth's core by using given elastic constants and methods developed earlier and to see how we can interpret the crystallization of iron in that area by these results as well as a look at how sound waves propagate in solid and liquid substances, how the elastic properties of a material can affect the waves and how we can relate these to the attenuation. The attenuation inside Earth will also be described.

  • Tober, Hampus
    et al.
    KTH, School of Engineering Sciences (SCI).
    Hänninger, Erik
    KTH, School of Engineering Sciences (SCI).
    Evaluation of OpenFOAM performance for RANS simulationsof flow around a NACA 4412 airfoil2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to evaluate how well the RANS models implemented in the open-source software OpenFOAM performs when simulating flow around a NACA 4412 airfoil with a turbulent boundary layer. After assessing the different models and performing several tests, the Spalart Allmaras model was chosen to be the best candidate for this airfoil.

    The model was validated against several different references, including a flying-hot-wire study by Coles and Wadcock [5] for a chord based Reynolds number of 1.500.000, and a Direct Numerical Simulation (DNS) performed by Vinuesa et al. [18] at the Mechanics department at KTH for a Reynolds number of 400.000.

  • Lindholm, Ellinor
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Production of gangliosidebiosynthetic membrane enzymes for biochemical and functionalstudies: Expression, purification and crystallizationoptimization of Thermococcus onnurineus Dolicho l-phosphate mannose synthase, Homosapiens and Branchiostoma floridae Glucosylceramide synthase2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Glycolipids play important roles in the biology of prokaryotes and eukaryotes, including humans, and although theyare found on the cell-membrane surface of all eukaryotic cells, not much is known about their biosynthesis. The aim ofthis project was to characterize two enzymes: glucosylceramide synthase (GCS) which is involved in the biosynthesisof glycolipids such as gangliosides that are abundant in the membranes of nerve cells; and dolicholphosphate mannosesynthase (DPMS), involved in the synthesis precursor for protein glycosylation. Both GCS and DPMS have beenshown play a role in cancer as well as in congenital disorders of glycosylation, and are therefore interesting targets tostudy from a therapeutic perspective.With the goal to identify a suitable expression system for GCS, the genes coding for GCS from lancelet(Branchiostoma floridae) and human (Homo sapiens) were cloned and tested for expression in Escherichia coliBL21(DE3)T1 and C41(DE3) using different vectors. Cloning into three different vectors was successful and initialexpression testing was performed. SDS-PAGE analysis confirmed initial expression of proteins. Although the correctsize of the protein could be confirmed by Western blot, no fluorescence of the GFP-fusion protein could be detected.DPMS from Thermococcus onnurineus (ToDP) was expressed in E. coli C41(DE3) and purified by immobilizedmetal ion affinity chromatography and gel filtration. Crystallization optimization was performed for ToDP producedfrom the vector pNIC28-Bsa4 and plate-like crystals were obtained. X-ray intensity data analysis indicated that thesecrystals contained lipid rather than protein. Crystallization screening for ToDP produced from the vector pNIC-CTHOconstruct was successful. Crystallization screening using the commercially available MemGold-HT96 crystallizationkit resulted in initial crystallization that yielded protein crystals that diffracted to 10 °A resolution.

  • Wongmaha, Kusuma
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Feasibility Study of a Technology for Catalytic Low Pressure Depolymerization of Biomass to Diesel in Thailand2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The study has been conducted in collaboration with Swestep AB, a Swedish company that specializes in the conversion of waste to valuable products via the KDV technology. The study explores the possibility of using cassava chips and cassava pulp as a potential feedstock in the production of synthetic diesel and compares the KDV method with fermentation, a conventional method of using cassava chips and cassava pulp in Thailand. To obtain the carbon yield, amount of product and system efficiency, a mass and energy balances were first performed on wood feedstock data provided by the company. The balances were thereafter used as a basis for a simulation analysis of the cassava feedstock. The diesel product yield is produced through a KDV 150 plant using 551kg/h of the different feedstock; wood, cassava chips and cassava pulp resulting in different amounts of diesel product 150 L/h, 116.79 L/h and 121.31 L/h, respectively. For cassava, the C yield in diesel is 0.41 while the C yield of ethanol production is 0.14, since C in the ethanol production is converted into other matters. Besides, the system efficiency of the KDV plant with different types of feedstock is around 0.84 because some parts of the KDV plant is self-supplied whereas the ethanol production plant (55% of system efficiency) is not. Economical evaluations of the KDV 5000 and ethanol production plant were performed. The KDV 5000 with cassava pulp as feedstock produces 31 ML/year and is feasible for investment in Thailand due to the low price of the feedstock which is driving the operation cost (15.167 baht/L or 0.46 USD/L). This is lower than the selling price (21.329 baht/L or 0.65 USD/L) whereas the KDV 5000 plant with cassava chips is not feasible. The KDV plant with cassava pulp as a feedstock will reach the breakeven point after running for 7 years. The ethanol production process with cassava chip as feedstock produces 49 M liter/year and has an operation cost of 19.693 baht/liter (0.6 USD/L) which is higher than the KDV plant due to the feedstock price. The selling price of ethanol is 23.11 baht/l (0.705 USD/L) which resulted in the process reaching the breakeven point after 14 years.

  • Somsri, Surapat
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Upgrading of Waste Tire Pyrolysis Oil2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The annual increase in waste car tires in addition to the enormous amount at present poses a major waste management problem as well as an environmental hazard. However, pyrolysis is emerging as a solution for waste tire management and a viable technology for material recycling and energy recovery that produces high energy liquid and gas products as well as char. The pyrolysis oil that is produced from this technology has the potential to be used as vehicle fuel but contains exceeding levels of sulfur and other impurities. This study investigates the upgrading and desulfurization of waste tire pyrolysis oil by reactive adsorption using a molybdenum modified zeolite and its desilicated form. The experiments were performed at 320 °C and a LHSV of 45-50 h-1 for approximately 45 min, and revealed that both desilication and Mo-modification resulted in the cracking of both gaseous and liquids compounds, reduction of TAN, denitrogenation, and deoxygenation. Desilication increased desulfurization while Mo-modification increased the EHI. The treatment was the most effective in the removal of oxygen, followed by nitrogen and sulfur. In conclusion, the treatment process is promising as a method for direct liquid upgrading but requires further research. 

  • Kessler, Amanda
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Intercoat adhesion: How can intercoat adhesion be studied and what influences intercoat adhesion2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Coatings cover most objects in our daily lives. They can have functional properties such as protecting the coated material or esthetic properties to decorate and provide pleasant appearance. Coatings have historically dried by evaporation of solvents, but now, UV curing coatings are on the uprising. Acrylate functional groups on polymers, oligomers and monomers react through radical chain polymerization initiated by photoinitiators. Photoinitiators are molecules which forms radicals when irradiated with UV light.Coatings are often applied on multiple layers, each layer providing one function for the overall system. To function properly and have desired life time the layers must adhere to each other. The problem of intercoat adhesion has yet to find good techniques for analysis and explanation of what influences it. Many theories have been suggested and most likely many play a part in the overall adhesion.The master thesis project aim to investigate which properties that influences intercoat adhesion and how it can be studied. To relate properties of coatings to the intercoat adhesion one UV curing primer is set to use for all coating systems, and various topcoats have been produced with slight changes in formulation. The study can be divided into two parts; a pre-study and a main study. The pre-study follows up on a previous master thesis conducted at Sherwin-Williams AB. The pre-study has waterbased and waterbased UV-curable topcoats. The main study has UV curable topcoats. Properties which are studied in the main study are chemical backbone of the binder, functionality of monomers, influence of addition of wetting agents, defoamers, fillers and pigment, viscosity, density, pH, curing degree at depth, surface energy, surface tension, surface polarity and monomer to binder ratio.The pull-off method is the best method of analysis of intercoat adhesion today. A dolly is glued to a surface and then lifted, the force of lifting the dolly is measured. The method has one significant drawback; the break must be completely in the interphase of where the adhesion wishes to be analyzed. Throughout this study most interphase failures were between substrate and primer, resulting in no value for intercoat adhesion.No correlation was found between intercoat adhesion and chemical backbone of the binder, functionality of monomers, addition of wetting agents, defoamers, viscosity, pH, surface energy, surface tension or surface polarity. Lower intercoat adhesion was observed for coatings containing talc, calcium carbonate and titanium dioxide. Coating containing titanium dioxide showed insufficient curing above a coating thickness of 40 μm. The insufficient curing could be observed as wrinkles on the surface and liquid coating remaining in the coating interphase. Curing degree in depth of the topcoat is believed to be the main reason to decreased intercoat adhesion for the coating containing titanium dioxide. The insufficient curing could not be confirmed with infrared spectrometry. The reason why talc and calcium carbonate showed decreased intercoat adhesion is not known. Indications suggest that a lower monomer to binder ratio decrease intercoat adhesion, theories to explain this are the high viscosity and the low number of functional groups per volume. A higher number of functional groups per volume could increase the number of crosslinks formed between topcoat and primer.

  • Garemark, Jonas
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Studies of the Impregnation Stagein Kraft Pulping of Hardwood2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In kraft pulping, one of the main issues is the extensive wood losses. With increasing prices ofwoody biomass an incentive towards minimizing the wood losses exists. Amongst the variousprocess steps, the impregnation of wood chips has shown to enhance the cooking by providinga homogeneous distribution of chemicals inside the chips. It is proven that a more proficientimpregnation phase can improve the overall yield in kraft pulping. However, there is a lack ofscientific research comparing different impregnation techniques for hardwood. Hence, thisthesis will attempt to clarify the impregnation of hardwood.The impregnation efficiency was studied by comparing three different impregnation methods:High Alkali Impregnation (HAI), Extended Impregnation (EI) using a low alkali level and aReference Impregnation (REF) to enable a comparison to the industrially establishedconditions. The cases were compared by analysing the yield, selectivity and homogeneity. Thecomparison was also made under cooking conditions with the objective to understand theimpact of impregnation on the subsequent cooking phase. The cooking procedure was assessedby analysing the degree of delignification, yield and reject content.In impregnation, most chemical consuming reactions occurred within the first 10-30 minutes,mainly contributed by deacetylation. HAI obtained the fastest homogeneous distribution of OH-(~60 min), but the fastest dissolution of wood. The effect was contributed by the high [OH-],providing fast diffusion of ions and rapid dissolution of xylan. In the contrary, EI attained thehighest impregnation yield after a given impregnation time but required a prolonged durationto obtain a chemical equilibrium between the free and bound liquor (~120 min). REF showeda higher yield than HAI and similar chemical equilibrium as EI. The hydrosulphide sorption inimpregnation was highest for EI due to the high initial sulphidity charge and similar for REFand HAI. For impregnations at 115°C, the HS- sorption was significantly increased for all cases,resulting from delignification. In the subsequent cooking phase, it was prevalent that impregnation of chips under EIconditions were easier delignified, leading to a reduced cooking time to reach the defibrationpoint. Birch was more prone to delignification than eucalyptus. In turn, eucalyptus also obtaineda higher defibration point. Highest total cooking yield at similar kappa numbers was achievedwith REF conditions, followed by HAI and lastly the EI conditions. The high yield of REF incontrast to HAI could be explained by an improved xylan yield due to an alleviated hydroxidelevel. The low yield of EI can be assigned to continues peeling due to the prolongedimpregnation and loss of xylan when removing black liquor after impregnation. In terms ofproduction rate, yield, energy and chemical consumption the REF is the most efficientimpregnation condition for birch kraft cooking in this batchwise laboratory kraft cookingprocedure.

  • Hansson Brusewitz, Anna
    KTH, School of Architecture and the Built Environment (ABE).
    Genom betraktande och interaktion2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Från att ha förklarat världen genom religion och mystik lever vi i ett samhälle som värderar vetenskap och ekonomisk tillväxt högre än andlighet, på gott och ont. Ändå kan vetenskapen inte förklara allt och välstånd inte vara det ända målet. Människor söker därför efter nya sätt att se på tillvaron - och det borde få ta fysisk plats och form i staden.

    I och med samhällets sekularisering har många av de funktioner som religion tidigare fyllt bytts ut av andra som vetenskap, rationalitet och konsumtion av kultur. Samtidigt har vi genom teknologisering och urbanisering gått miste om tystnaden. Vi behöver tystnad från konstanta intryck och göromål för kunna lyssna till och själva och ge plats åt de viktiga frågorna och känslorna om sådant som vi inte längre har en tydlig bild kring som exempelvis mening. Arbetet leder fram till att det fysisk rummet inte behöver vara helt tyst som ett vakuum eller fysiskt tomt utan ska istället möjliggöra för tystnad i det mentala rummet genom att eliminera brus och skapa närvaro så att man där med odelad uppmärksamhet kan låta det inre livet med reflektion och känslor ta plats och leva.

    I förslaget på en andlig plats i Stockholm har objekt för koncentration tolkats som både något man meditativt kan betrakta som exempelvis himlen, folkmyller, ljus eller objekt och även att man kan interagera med den fysiska miljön som att dra med händerna längs en struktur, förflytta sig själv eller objekt eller lämna avtryck och få en sensation. I projektet är valda delar av Observatorielunden samt de tillägg objekt för koncentration. Förutom närvaro fungerar dessa objekt för koncentration som fokusskiftare som hjälper besökaren att lämna stadsbruset och måsten för att träda in i det mentala rummet. En rörelse är lagd mellan dem där förflyttning och skiftning av intryck i en egen vald takt kan stödja den inre resan.

  • Úlfarsdóttir, Björk
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Interaction between Icelandic basalt and Swedish granite with Swedish bitumen emulsion: Is it possible to use Swedish bitumen emulsion in Iceland?2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Like in any modern civilization, roads in Iceland have an important role in thedaily lives of inhabitants. Consequently, road quality is of equal importance, butIcelandic roads have shown problems when surface dressing is used where itlooks decent after being paved during summer but then deforming pretty rapidlyafter being hit by elements of winter. Roads in Sweden however, do not seem tohave the same problem.The aim of this study is to minimize this road deformation by examining surfacedressing and aggregates. The Icelandic climate is also a factor to this problemsince the humidity is comparatively high, summers are cool, winters are mild andthe climate is overall challenging. Furthermore, winter thaws are distinctivecharacteristic of the Icelandic weather, which increases strain on the asphalt.An experiment was conducted where the adhesion of surface dressing that iscommon in Sweden was tested with two different aggregates by Vialit plateshock test method. First it was tested with Swedish granite and then withIcelandic basalt. The results from the aggregates were compared where theadhesion with the granite was stronger than with the basalt.Previous study have found that by choosing binder and aggregate that have highadhesivity at low temperature reduces the risk of surface dressing defects,especially when paving takes place in the early and late summer season. Whenchoosing aggregates for road construction the main criteria is cost, thereforeaggregates that are used usually reflect the local geology because transportingaggregates for significant distances is expensive. Concluding from theexperiment, it is not recommended to use the basalt with the Swedish surfacedressing in practice now due to the lesser adhesion compared to the granite.However further research on the asphalt mix with the Swedish surface dressingand the basalt should be conducted.

  • Wataru, Katagiri
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH). Graduate School of Science and Keio University.
    Evaluation of skin cell heat damage for the safe usage of laser medical devices2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A lot of laser medical devices have been developed over the past half-century. Particularly these days, low-level near-infrared laser devices that illuminate epidermal tissue have been rapidly innovated. Especially. it has been reported that less than 5 W/cm2 infrared light stimulates our immune system and is expected to be applied in clinical usage. In terms of the safety and efficacy of the therapies or the treatments, an accurate heat damage criterion is required. We showed the damage threshold of heat generated by infrared laser irradiation with cultivated human epidermal keratinocytes. These results define the safe combinations of temperature and laser duration.

  • Loftén, Carl
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Hammerbo, Gustaf
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Mwakikonge community space2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • Abdirahman Ahmed, Fatima
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.
    Reologistudie av vattenbaserade industrifärger2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The rheological properties of water-based paint have been studied and the parameters that were investigated were mobility, viscoelasticity, sagging and levelling. The methods that are presented in this study can predict sagging before the paint is applied on a vertical surface. The purpose of this study is to understand how different paints behave when sprayed on a vertical surface. The main goal in this study is to develop a method that can predict sagging when the wet condition is 300 μm.

    The rheometer gave measurement data that could be graded on a scale. Every paint had a value on this graded scale. A "Shear Rate Loop Test" was used to grade the paints after a graphical analysis. The development on the graded scale gives the right information whether the paint sags or not.

    Different types of oscillation tests were performed and these tests were 3ITT, amplitude sweep and frequency sweep. Elastic and viscous behaviour were measured and they illustrated what behaviour was dominating in the paints. 28 water-based paints were analysed and the methods for these paints can predict how they flow on a vertical surface.

  • Kluczny, Maksymilian
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
    Synthesis and Electrochemical Evaluation of Perovskite related oxide for Active Cathode for Solid Oxide Fuel Cells (SOFCs)2017Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Solid oxide fuel cells are used as stationary power plants for electricity production. Despite having a very high efficiency of 90% they haven’t gained a world-wide commercial usage, due to their very high operating temperatures, and high production cost. However, there is a lot of ongoing research with the aim of developing intermediate-temperature solid oxide fuel cells (IT-SOFCs) that could operate at temperatures below 800°C.

    Cathodes are the most studied components of IT-SOFCs, since decreasing operating temperature results in slow oxygen reduction reaction(ORR) kinetics and large polarization losses. Perovskite related metal oxides have become very popular materials that could make suitable cathodes for IT-SOFCs. In this work an evaluation of several materials belonging to three different material groups have been studied: single layer perovskites, with a general formula of ABO3, double layer perovskites, with a general formula of AA’B2O6 and Ruddlesden-Popper phase, with a general formula of An+1BnO3n+1. Power generating capabilities of those materials have been studied on an electrolyte supported cell, cathode/LSGM9182/Ni-Fe. IR drop and overpotential of the cathode was measured and activation energy of the ORR for each material has been calculated.

    The double layer perovskite cobaltites offer a significant drop in overpotential, increase in conductivity compared to their single layer counterpart, while being able to generate significant amount of power. Ruddlesden-Popper phase materials offer the lowest activation energy values amongst the researched materials, but offer limited power generation values in the setup they were tested. Both of double layer perovskites and Ruddlesden-Popper based materials have opportunities for their performance to be improved.

  • Joacim, Levander
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Biomedical Engineering and Health Systems, Ergonomics.
    Säkerhet, risker och stress: en deskriptiv fallstudie av ramppersonalens arbetsmiljö2017Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    This study had the standpoint in the terms that refers to ground handlers on a Swedish airport. The risks involved in loading and unloading the goods. The issue grew as the knowledge increased about the Human, Technology and Organisation (HTO). The part of the background content elements and concepts touching stress, concept of safety, safety at the airports. The aim of this study was to describe if the safety, risks eventually influences ground handlers by stress linked to loading and unloading of aircrafts. To picture the association between them, HTO and demand-control-support perspective where used. The study didn´t cover goals of interventions. The study design in use where the descriptive case study. Methods in use where individual interviewing, focus group interviewing, participant observation with so called full involvement on the ramp. Selection of participant where based on staff on duty. Member of the leadership did de selection guided by the scheduled interviews. The study comprehended the importance of working schedule, organisation issues, deliberately assumption of risk and a high risk of accident. Support from nearest and highest leadership was high. There were indications about the importance of social support and sense of security in the team. Most concerned newly employed. The importance of the type of aircraft, problems connected with narrow bodied aircrafts. Keep on the work to change this type of aircraft, above all else on nightly goods aircrafts will radically improve the ergonomics and safety. Next scientific work suggested to look at the connection between the equipment used by load, unloading and stress. When the type of aircrafts has been changed look at the impact on stress, risks and safety. Also suggested scientific work to look at the organisation of work in and between the team. How the organisation works out practically on the ramp, between ground handlers and custom service and between ground handlers and the leadership. Next scientific work could also look closer to the hypothetical causal model described in this work. Aimed to enhance and develop the systematic work environment management (SAM).

  • Mavajian, Zahra
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
    Investigation of DNA Base Excision Repair in MTH1 Depleted T-cell Acute Lymphoblastic Leukemia cells2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Genomic alterations may initiate cancer development as the consequence of endogenous or exogenous DNA damaging factors. Defects in DNA repair mechanisms may also facilitate cancer progression as well as accumulation of mutations which favor cancer cell survival. However, DNA repair pathways in cancer cells can be considered as their Achilles heel which are possible targets in order to compromise their survival. For instance, it has been demonstrated recently that inhibition of a protein called MTH1 via RNA interference (RNAi) or chemical inhibitors can stop tumor growth and triggers cell death by increasing the load of oxidative DNA damage. MTH1 is a hydrolase which converts 8-oxo-dGTP into 8-oxo-dGMP in order to prevent incorporation of oxidatively damaged nucleotides into DNA. In addition, DNA glycosylases which recognize and remove mismatched or damaged nucleotide pairs in DNA can also participate in repair of 8-oxo-dG, such as MUTYH repairing A:8-oxo-dG pair. The goal of the current study was to investigate the importance of MUTYH activity upon MTH1 depletion. The current study tried to answer whether simultaneous knock-down of MTH1 and MUTYH sensitizes cancer cells to oxidative stress and increases cell death. Both enzymes were simultaneously depleted in T cell acute lymphoblastic leukemia cells using RNAi. Then, we analyzed the efficiency of gene and protein knock-down by quantitative real-time-PCR and western blotting, respectively. Induction of cell death was also assessed by flow cytometric analysis of cell cycle. Afterwards, the effect of the treatments on DNA repair pathways was studied by analysis of gene expression of several DNA glycosylases and DNA polymerases using qRT-PCR. The results showed that concurrent depletion of both enzymes led to synergistic induction of cell death. Down-regulation of NEIL1 DNA glycosylase as well as POLQ and POLH DNA polymerases mRNAs adapted their DNA repair pathways to cope with induced damages under these conditions. Finally, the results of this study suggest that dual suppression of MTH1 and MUTYH may provide a new approach to reduce survival of T cell ALL.

  • Danielsson, Simon
    et al.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Flygare, Jakob
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    A Multi-Target Graph-Constrained HMM Localisation Approach using Sparse Wi-Fi Sensor Data2018Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    This thesis explored the possibilities of using a Hidden Markov Model approach for multi-target localisation in an urban environment, with observations generated from Wi-Fi sensors. The area is modelled as a network of nodes and arcs, where the arcs represent sidewalks in the area and constitutes the hidden states in the model. The output of the model is the expected amount of people at each road segment throughout the day. In addition to this, two methods for analyzing the impact of events in the area are proposed. The first method is based on a time series analysis, and the second one is based on the updated transition matrix using the Baum-Welch algorithm. Both methods reveal which road segments are most heavily affected by a surge of traffic in the area, as well as potential bottleneck areas where congestion is likely to have occurred.

  • Eskandari, Aram
    et al.
    KTH, School of Engineering Sciences (SCI).
    Tellström, Benjamin
    KTH, School of Engineering Sciences (SCI).
    Analysis of the Performance Impact of Black-box Randomization for 7 Sorting Algorithms2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Can black-box randomization change the performance of algorithms? The problem of worst-case behaviour in algorithms is difficult to handle, black-box randomization is one method that has not been rigorously tested. If it could be used to mitigate worst-case behaviour for our chosen algorithms, black-box randomization should be seriously considered for active usage in more algorithms.

    We have found variables that can be put through a black-box randomizer while our algorithm still gives correct output. These variables have been disturbed and a qualitative manual analysis has been done to observe the performance impact during black-box randomization. This analysis was done for 7 different sorting algorithms using Java openJDK 8.

    Our results show signs of improvement after black-box randomization, however our experiments showed a clear uncertainty when con- ducting time measurements for sorting algorithms.

  • Kindström, Sofia
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Tillståndsklassificering avdet svenska stamnätet och riktlinjer vid fysisk elhandel2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The Swedish transmission grid needs to be in balance which means that the frequency should be 50 Hz. Depending on which condition, above or below 50 Hz the grid is located in and depending on the retailors forcasts they can earn or loose money due to the extra costs of balancing the grid. In this report two classification models takes form in order to predict in which condition the Swedish transmission grid is going to be located in. This in order to provide retailors to adjust their forecasts so they can earn money. The models are based on quadratic discriminant analysis and from it guidelines for the forecast changes is estimated with linear programming. Both models are rather crude. The first model due to the errors coming from the difficulty of finding the extreme values of the cost and the second model for the fact that one class contains both large negative and large positive values of the cost which makes the class unusable. Although, still with great caution the results show positive effects for the balance responsible party if the model should be implemented. Especially over long term a large amount of money can be earned by using the method provided in this report.

  • Ytterberg, Kim
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Procedurers inverkan på kodförståelse i Java: En studie med eye-tracking2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the software life cycle, a great amount of time is spent on the final stage, the maintenance phase. At this stage, the software is fully developed and needs continuous maintenance to ensure constant functionality and efficiency of the software [25]. It is therefore important for the software to be as readable as possible since other programmers might start working on the software. It is also important to keep the code readable to quickly troubleshoot the code. Procedures are taught as a way to keep the code structured and easy to read among other abstractions. In recent years, the study of code readability has gained an increasing popularity and with the help of eye-tracking it has allowed for the study of readability in a more concrete way.

    In this report, the impact of procedures on code readability has been investigated by conducting a controlled experiment, which has been done by examining the eye movements of ten test subjects who had been tasked with interpreting a number of problems in Java, where the problems ranged from the use of procedures or not (being plain monolithic code blocks). The assigned problems involve the interpretation of code while their eye movements are recorded and presented as images and as data in a spreadsheet.

    The results show that beginners generally take longer to read methods compared to sequential code, while experienced programmers did not differ as much- or were even faster to resolve the procedural code segments. It can also be said that experienced programmers have a different way of reading code compared to beginners which may be interesting to study further. The conclusion is that control flow abstractions in the form of procedures make it easier for programmers to read code, but it takes time and experience to take advantage of their beneficial effects.

  • Jagelid, Nicole
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Kindberg, Ludvig
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Examination of the effects of student-teacher interactions on student commit patterns - In the GitHub environment2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In 2015 the Computer Science program at the Royal Institute of Technology (KTH) first included GitHub in the curriculum of the introductory courses to programming. The idea was for GitHub to work as a tool for submitting assignments as well as a platform for student-teacher interactions and feedback. Ultimately to introduce the students to a version controller and the iterative process of software development.The aim of this paper was to examine the influence of teaching assistants in the Introductory courses to Computer Science at KTH, by evaluating the student-teacher interactions and student commit behaviour on GitHub. The material was collected from three successive course iterations 2015, 2016 and 2017 through KTH´s GitHub Enterprise where the enrolled students submitted their assignments.The teaching assistants are not given explicit instructions on how to make use of GitHub other than for it to be a hand-in tool and a platform for presenting grades and possibly feedback.The retrieved data was compiled into graphs and evaluated from different angles. The results found that no direct correlation could be made between student teacher interactions and number of commits by the students. However the data could tell of a varying commit behaviour and interaction behaviour dependent on the assignments. Differences between groups from beginning to end were also found, however they could not be linked to the number of interactions on KTH-GitHub.

  • Persson, Ludvig
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Larsson, Jesper
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Sarcasm Detection with TensorFlow2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sentiment analysis is the process of letting a computer guess the senti- ment of someone towards something based on a text. This can among other things be useful in marketing, for example in the case of the computer figuring out that a certain person likes a certain product it can present ads for similar products to the person. Sentiment analy- sis in social media is when the texts analyzed are from a social media context like comments or posts on Twitter, Facebook, etc. One prob- lematic aspect of these texts is sarcasm. People tend to be sarcastic very often in social media, with sarcasm being something that can be hard to detect even for a human this does cause problems for the com- puter. This study was conducted with the intention of investigating how sarcasm detection can be performed in social media texts with the help of machine learning. For this purpose Google’s machine learning framework for Python, TensorFlow, was utilized. The machine learn- ing model created was a deep neural network with two hidden layers containing ten nodes each. As for the input a dataset of 4692 texts were used with a 80/20 training/testing split. For preprocessing the texts into a more suitable form for TensorFlow the methods Bag of Words, Bigrams and a naive method here refered to as Char for Char were con- sidered. However due to time constraints proper results from the more advanced approaches (Bigrams and Bag of Words) were not achieved. It was at least found that the rather simple approach was better than expected, with results notably better than 50% that would be highly unlikely to achieve through sheer luck.

  • Lewerentz, Eric
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Westerberg, Ellinor
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Sentiment analysis of tweets in comparison to a company’s financial performance2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study analyzes peoples reactions in social media to the release of a company’s quarterly report. Sentiment analysis was performed on tweets about a company both from a short-and long-term perspective. On the long-term perspective, a two year period of sentiment was studied in relation to its quarter’s percental change of net income and revenues. Three companies was investigated in this process. On the short-term perspective, a linear regression was conducted based the quarter’s percental change of net income and revenues and on sentiment score, ranging from release day to 2 days after the release of a company’s quarterly report, in total five companies were studied. The result inferred that there was no correlation between the company’s net income and the reaction on Twitter on both long and short-term. Our conclusion is that the attitude towards a company is influenced by other factors than net income and revenues. The study also indicates that sentiments found in Twitter messages regarding a company name are related to a positive or negative expectation of the company. Findings suggest future studies to focus on companies greatly dependent on one product and analyze sentiment regarding that product instead, as the product is likely to impact financial results.

  • Janiuk, Ludvig
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Sjölén, Johan
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Probabilistic Least-violating Control Strategy Synthesis with Safety Rules2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    We consider the problem of automatic control strategy synthesis for discrete models of robotic systems, where the goal is to travel from some region to another while obeying a given set of safety rules in an environment with uncertain properties. This is a probabilistic extension of the work by Jana Tumová et al.  that is able to handle uncertainty by modifying the least-violating strategy synthesis algorithm. The first novel contribution is a way of modelling uncertain events in a map as a Markov decision process with a specific structure, using what we call "Ghost States". We then introduce a way of constructing a Product Automaton analogous to the original work, on which a modified probabilistic version of Dijkstra's algorithm can be run to synthesize the least-violating plan. The result is a synthesis algorithm that works similarly to the original, but can handle probabilistic uncertainty. It could be used in cases where e.g. uncertain weather conditions or the behaviour of external actors can be modelled as stochastic variables.

  • Gunning, Robin
    KTH, School of Electrical Engineering and Computer Science (EECS).
    A performance comparison of coverage algorithms for simple robotic vacuum cleaners2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cheap automatic robotic vacuum cleaners keep their cost down by having less sensors and many of them focus on using a single frontal bumper sensor, this makes it important to be able to get good coverage of a room with no knowledge of said room. This paper investigates whether the algorithm boustrophedon is enough to get a good coverage of a simple room with a maximum of two furnitures and only 90 degree corners.

    A graphical simulation were made to test the algorithms that are commonly used in cheap automatic robotic vacuum cleaners to compare them with the result of only using boustrophedon. The results show that the best algorithms are the non-deterministic random walk and all combined. Boustrophedon tends to get stuck when the room is not empty and it only cleans half the room when starting in the middle of the room, while being the fastest and gets most coverage in an empty room when starting in a corner.

  • Gylling, Andreas
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Elmarsson, Emil
    KTH, School of Electrical Engineering and Computer Science (EECS).
    Improving robotic vacuum cleaners: Minimising the time needed for complete dust removal2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to examine the cleaning efficiency of an autonomous vacuum cleaner robot; namely, reducing the cleaning time needed in an empty room. To do this we explored how the path planning could be improved upon given access to a dust map that would allow for more sophisticated algorithms depending on the state of the room. The approach we employed in order to compare different preprogrammed path patterns and our own greedy heuristic was to create a simulation environment in Unity3d. In this environment we could create a two dimensional plane to represent the length and width of a room with the size of our choosing. This plane was then subdivided into squared cells that would discretise the environment, which represented the dust map of the room. The tests were conducted in rooms with different dimensions in order to examine how different strategies' efficiency developed in relation to each other. Employing an algorithm like our greedy heuristic after an initial zigzag sweep resulted in a significant improvement in comparison to a robot that is restricted to template patterns only. Future work could involve finding the optimised solution for our heuristic in order to make full use of the dust map and thereby achieve minimal cleaning time for the robot. 

  • Johansson, Fredrik
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Spross, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Damasceno, Davi
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Johansson, Jan
    Naturgasteknik AB.
    Stille, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Investigation of research needs regarding the storage of hydrogen gas in lined rock caverns: Prestudy for Work Package 2.3 in HYBRIT Research Program 12018Report (Other academic)
    Abstract [en]

    The objective of HYBRIT RP1 is to explore and assess pathways to fossil-free energy-mining-iron-steel value chains and thereby provide a basis for industrial development activities and the necessary future transformative change in this field. A large-scale storage capacity for hydrogen gas is an important component of the proposed HYBRIT concept. Underground storage in lined rock caverns provides a reasonable option: a large-scale demonstration plant for storage of natural gas was constructed in Sweden in 2002 and has operated safely since then. Considering that this lined rock cavern facility was constructed for natural gas, the present report investigates the current research needs to allow for underground storage of hydrogen gas in such a facility. This will serve as a basis for the research in Work Package 2.3 of HYBRIT RP1.

    Studying the experiences from decades of Swedish and international research and practice on the construction of underground gas storage facilities, the conclusion is that the lined rock cavern concept seems a reasonable way forward. In terms of rock engineering research, there are currently no critical research issues; however, a development of a previously proposed risk-based design framework for lined rock caverns may further strengthen the ability to manage risks related to underground gas storage facilities. The report identifies several potential research questions on this topic to be further studied: development of a risk-based design approach using subset simulation, the optimization potential of the concrete thickness in the lining, and the effect of spatial variation of rock mass properties on a location’s suitability for the storage facility.

    Additionally, the report identifies the potential effect of hydrogen embrittlement on the steel lining as a critical research issue to ensure safe storage of hydrogen gas in lined rock caverns. However, as this issue is not related to rock engineering, but a material issue, it will not be covered further in Work Package 2.3.

  • Emilsson, Arvid
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Johansson, Hugo
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Solcellsladdare i Stockholm2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Stockholm has set a goal to be fossil free by 2040 as well as producing 10 % of the energy used in Stockholm within Stockholm. As the transport sector in Stockholm is highly dependent on fossil fuels this need massive changes. An alternative that is commonly discussed is the possibility to use electric vehicles as a replacement for fossil driven vehicles. Even though Sweden has, relatively to many other countries, a carbon neutral electricity production alternative power sources such as solar power are frequently discussed for reasons such as the ongoing debate on the future of Swedish nuclear power. In this report economical and technical aspects of a simplified case, where a company is assumed to invest in charging points for electric vehicles and the choice is between choosing an integrated system containing, in addition to the charging points, solar panels and a battery. Different commercial photovoltaic modules, sizes of the battery and number of charging points are examined with a constant reference solar panel area with simulations in the software PolySun. One module of thin film, poly-and monocrystalline are used.This makes it hard to guarantee a high share of solar electricity when many charging points are in use. Economically it is, with the used chargin pattern, always profitable to invest in solar modules with and without batteries in the charging station even if, with the prices of today, it is always better to not invest in batteries. The payback time of the system varies between 10 and 14 years without a 10 kWh battery and between 15 and 18 with a battery of the same size. Monocrystalline panels had the longest payback time in both cases. The panel with best results economically was the polycrystalline module and that is the recommendation made.A recommendation on future work is, amongst other, to do a study with more advanced charging patterns as well as a more advanced economic analysis.

  • Passburg, Carl Victor
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Joelsson, Magnus
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Solenergi i stadsmiljö: En fallstudie för implementering av solenergi på Lindes Backe, Årstastråket2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report addresses the possible integration of solar technology in urban environments. The focus is primarily on the municipality of Stockholm and their set of goals regarding climate. Is solar power an energy source sufficiently mature to be a profitable alternative for a relatively cold and dark country like Sweden, or could perhaps the favorable political incentives make it so? Solar energy currently accounts for only 0,1% of the national electricity production, which means that the goal of solar power to account for 10% of Stockholms total energy mix by 2040 is a tough challenge. The purpose of the report is to investigate the profitability of the application of solar power on the roof of a residential area in Stockholm. This was done through a case study on JM’s newly build residential area, Lindes Backe , whose results gave the potential value from a practical, financial and socio-economic perspective. The case study was then related from a larger perspective to evaluate Stockholm’s set climate goals to assess whether the goals may be reasonable. This report has no customer or client, but is intended for the city of Stockholm and housing developer JM .The result of the case study showed that is was not economically profitable in any case or scenario where the residential area did not consume 100% of the self-produced electricity. Only one case showed to be profitable which was when the solar cells on the roof that leans in the southwest direction, which amounted the greatest solar radiation. The repayment period for this system was roughly 23 years, yielding a rate of return of 5.5%. Depending on the investor, this can be considered not profitable, for a privately owned construction company for example, or it might be acceptable for a developer which attaches a greater importance on the overall socio-economic profit. These investments gave a positive environmental impact, but the lack of economic profitability means that a widespread use of solar energy currently does not seem likely in the region of Stockholm - other than for smaller systems built for individual use. Further cost reduction and advances in the technology can change this is a longer perspective, but this report concludes that the climate goals will be difficult to achieve.

  • Söderlind, Viktor
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Hallström, Gustav
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Arkitekturens tillstånd2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    We wanted to, with a physical structure, investigate and reflect on the difficulties and opportunities that built architecture meets. In an attempt to initially free ourselves from an overly formalistic work process, we saw the art of play as a catalyst for creativity. The play, and especially the playful human, influenced the project in several ways. For example, there has always been a strong sense of serendipity during the project development. We have been driven by a situationist mindset, in which action, especially during the early stages of the project, has prevailed over planning. In agreement with Debord’s reasoning in “The Society of the Spectacle” and Lefebvres “Right to the City”, we saw an opportunity to go against the passivizing influence induced by school and society.

  • Gynther, Caroline
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Seeing, Building: Looking at the Existing, Making Tectonic Translations2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    To build is to add to the existing. Three existing wooden buildings in Visby, made in three different local techniques (a post and plank, a timber frame and a log construction) have been the starting point for what to build upon. After studying these techniques, new buildings have been added in line with the principals of the existing. The existing buildings are situated on two sites, both courtyards, and have generated three additions: a kiosk, an apartment building and a visitor centre.

  • Grzesiak, Filip
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Capturing the Gothic Line: Parametric Exploration of the Gothic Ornament2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The project explores the ‘Gothic Line’ as observed in ornament. Escaping strictly geometrical means of defining, the study focuses on capturing the Line’s elusive properties in connection to chosen architectural elements.

    With selected properties, the two-dimensional principles are extracted into the 3D environment. Using parametric design tools each feature is transformed into multiple prototypes of three-dimensional interpretation.

    The project aims to capture subtlety of the Gothic Line while providing a system enabling creation of architecturally relevant ornamental structures.

  • Eriksson, André
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Views: Cinema, redefined2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Transforming the first floor of a 1950s building at Sveavägen, Stockholm, this project aims to redefine the traditional cinema. This is not a perfect quiet black box, but a place for sharing, experiencing and discussing film. A cinema for independent films, short films, documentaries and film festivals, but perhaps also presentations and lectures. A flexible building that can open up, or close down, depending on the event. A cinema where one can sit down for a brief movement with a coffee, or spend an evening at the big screen.

  • Nylén, Helmer
    et al.
    KTH, School of Engineering Sciences (SCI).
    Jacobsson, August
    KTH, School of Engineering Sciences (SCI).
    Investigation of a Knowledge-Based Subset Construction for Multi-Player Games of Imperfect Information2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Games can be used to model different autonomous decision problems to find strategies ac- cording to which the involved agents should act. When the agents in these problems cannot differentiate between certain states, for example due to a damaged sensor, the modeled game is said to be of imperfect information. The strategies in these types of games are much harder to find compared to games of perfect information, and it becomes even harder to find strategies when several agents are cooperating to solve a specific task in a so-called multi-player game of imperfect information.

    We study a multi-player variant of a well known knowledge-based subset construction for games of imperfect information, which now considers a coalition of players working towards a common goal. This generalized construction reduces uncertainty in a multi-player game of imperfect information by creating a new, knowledge-based game. This reduction is useful since winning strategies found in the knowledge-based game can be translated back into winning strategies in the original game. The properties of this multi-player knowledge-based subset construction (MKBSC) are still not fully known. Unlike the single-player knowledge-based subset construction, the MKBSC is not guaranteed to give knowledge-based games of perfect information, which complicates the strategy synthesis. It is possible to apply the construction to the new game, creating another knowledge-based game of increased epistemic depth. It- erating the construction on the knowledge-based games may cause an unbounded increase in the number of states, causing the game to diverge.

    We investigate the MKBSC by applying the construction to different multi-player games of imperfect information and classify the properties in the original game that may cause the constructed game to behave in certain ways. We observe that games which do not contain any observation overlaps or cycles within the game graph always stabilize when the construction is iterated on the game. These types of games are preferred when using the construction to create games which simplify strategy synthesis, since the number and size of created knowledge-based games is limited.

  • Enge, Leo
    et al.
    KTH, School of Engineering Sciences (SCI).
    Liu, Felix
    KTH, School of Engineering Sciences (SCI).
    Crowd Simulation Using Flow Tiles2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Crowd simulations are being used in an increasing number of different applications, like evacuation scenarios, video games and movie special effects This creates a demand for crowd simulators that are simple to use and accessible to users of varying backgrounds. We will study the flow tile method proposed by Chenney [1], which provides an intuitive way of interactively designing divergence free velocity fields for various applications. A reimplementation of Chenney's method will be given and the implementation will be evaluated in terms of user-friendliness and how well the use of static spatially defined velocity fields suits crowd simulation. Furthermore the possibility of using the velocity fields for other related applications such as mobile robotics will be touched on as well.

  • Dalla Torre, Kevin
    et al.
    KTH, School of Engineering Sciences (SCI).
    Abdul Jalil, Walid
    KTH, School of Engineering Sciences (SCI).
    The impact of missing data imputation on HCC survival prediction: Exploring the combination of missing data imputation with data-level methods such as clustering and oversampling2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The area of data imputation, which is the process of replacing missing data with substituted values, has been covered quite extensively in recent years. The literature on the practical impact of data imputation however, remains scarce. This thesis explores the impact of some of the state of the art data imputation methods on HCC survival prediction and classification in combination with data-level methods such as oversampling. More specifically, it explores imputation methods for mixed-type datasets and their impact on a particular HCC dataset. Previous research has shown that, the newer, more sophisticated imputation methods outperform simpler ones when evaluated with normalized root mean square error (NRMSE). Contrary to intuition however, the results of this study show that when combined with other data-level methods such as clustering and oversampling, the differences in imputation performance does not always impact classification in any meaningful way. This might be explained by the noise that is introduced when generating synthetic data points in the oversampling process. The results also show that one of the more sophisticated imputation methods, namely MICE, is highly dependent on prior assumptions about the underlying distributions of the dataset. When those assumptions are incorrect, the imputation method performs poorly and has a considerable negative impact on classification.

  • Nordström, Martin
    et al.
    KTH, School of Engineering Sciences (SCI).
    Bonnevie, Rodrigue
    KTH, School of Engineering Sciences (SCI).
    Undersökning av akustiskaegenskaper hos ett insugningssystem2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    An important part in designing quiet vehicles is the knowledge of the acoustic properties of components in the system. In this project, an intake system for a truck from Scania has been investigated, and radiated sound intensity and sound effect for different surface areas of the system are measured. The purpose was to determine the radiated sound effect and sound intensity of the system for these different cases:

    1. Quiet ow at different speeds

    2. Flow + noise

    3. Only noise

    The measurements were made in accordance with ISO 9614-2 [1], where the system was scanned with a sound intensity probe. The intake system was placed in MWL's eco-free room at KTH and the air exhausted into a reverberation room. A loudspeaker was also placed in the reverberation room to generate the sound into the system.

     

    The results showed that the largest parts of the system were also the parts that radiated the most sound power. The inlet on the system was characterized by radiating the most sound intensity. It was also noticeable that the sound from the speaker did not signiffcantly affect the result in the cases with ow and noise, but appeared to be masked almost entirely by the airow inside the system.

  • Eriksson, Anna
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Senja: Communal housing for tourists and seasonal workers in the fishing industry in the north of Norway2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This project takes place in the north of Norway, on an Island called Senja. With its beautiful nature and reliable resource of fish it attracts tourists in the summer time and seasonal workers in the fishing industry during the winter. 

    How can communal housing for tourists and workers act as a hub in the local community?

    Around this question a cluster of different functions has been developed that serves the whole community as well as the communal housing with private living units.

  • Ekman, Emma Ulfsdotter
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Merging pieces, searching the common: Interpreting appearance2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Copenhagen in the turn of the last century; light from the outside world seeks its way along the floor into the interior painted by Vilhelm Hammershoi. Why do I want to stay here? The surrounding space of the room in focus affects our perception of it; in what way are they connected and which sources of light might exist behind? My method has been to phenomenologically explore a set of artworks representing rooms that, to me, convey a sense of desirable place to stay and live in. My intention with these investigations was to build a dwelling space with shared functions; a collective living. I tried to recreate my interpretations from the artworks by building rooms with similar qualities, hoping this project would make more people choose a collective way of living rather than an individual one.

  • Ekblad, Marie
    KTH, School of Architecture and the Built Environment (ABE), Architecture.
    Urbana nomader: Likheter och ojämlikheter på en rörlig bostadsmarknad2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In the marketing of certain types of newly-built urban homes there is an intended target group: the “urban nomad”. A luxury hotel style dominates these pictures of future dwellings and a new aesthetic has evolved in rendered images. These types of images have become so common in architectural magazines and housing ads that they often go unnoticed. Behind the pictures is an underlying idea of ​​a flexible housing market that can create positive outcomes for the whole community. This project examines how the idea of ​​mobility in the Stockholm housing market affects the design and marketing of architecture and the possible downsides to the commercialization of urban homes.

  • Elf, Patric
    KTH, School of Engineering Sciences (SCI).
    Photophysics of blood on a crime scene2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to analyze the possibility to age-determine blood spots with the help of enzymes which blood contains, in order to see if with these results it's possible to give an estimate of how long it has been since blood left the body. The main domain of this would be that of a crime-scene in order to give a time-frame of when a crime has been commited. The analysis consists of a serum that has been spiked with these enzymes gets to dry over time, and how the activity of these enzymes, which are dependent on the enzymes denaturation change. Problems which arose, such as drying of the blood, what blood contains, as well as a brief review of the possibility to conjugate quantum dots to the enzymes are also reviewed.

  • Besharat Pour, Shiva
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Li, Qi
    KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
    Connecting Silos: Automation system for thesis processing in Canvas and DiVA2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As the era of digitalization dawns, the need to integrate separate silos into a synchronized connected system is becoming of ever greater significance. This thesis focuses on the Canvas Learning Management System (LMS) and the Digitala vetenskapliga arkive (DiVA) as examples of separate silos.

    The thesis presents several methods of automating document handling associated with a degree project. It exploits the fact that students will submit their thesis to their examiner via Canvas. Canvas is the LMS platform used by students to submit all their coursework. When the examiner approves the thesis, it will be archived in DiVA and optionally published on DiVA. DiVA is an institutional repository used for research publications and student theses.

    When manually archiving and publishing student theses on DiVA several fields need to be filled in. These fields provide meta data for the thesis itself. The content of these fields (author, title, keywords, abstract, …) can be used when searching via the DiVA portal. It might not seem like a massive task to enter this meta data for an individual thesis; however, given the number of theses that are submitted every year, this process takes a large amount of time and effort. Moreover, it is important to enter this data correctly, which is difficult when manually doing this task. Therefore, this thesis project seeks to automate this process for future theses.

    The proposed solution parses PDF documents and uses information from the LMS in order to automatically generate a cover for the thesis and fill in the required DiVA meta data. Additionally, information for inserting an announcement of the student's oral thesis presentation into a calendar system will be provided. Moreover, the data in each case will be checked for correctness and consistency.

    Manually filling in DiVA fields in order to publish theses has been a quite demanding and time-consuming process. Thus, there is often a delay before a thesis is published on DiVA. Therefore, this thesis project’s goal is to provide KTH with an automated means to handle thesis archiving and publication on DiVA, while doing so more efficiently, and with fewer errors. The correctness of the extracted meta data will be evaluated by comparing the results to the previously entered meta data for theses that have previously been achieved in DiVA. The automated process has been calculated to take roughly 50 seconds to prepare the information needed to publish a thesis to DiVA with ~71% accuracy, compared with 1 hour and 34% accuracy in the previous manual method.

  • Belkotain, Mehdi
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematical Statistics.
    X-Value Adjustments for Interest Rate Derivatives2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this report, we present the X-Value Adjustments and we introduce a simulation approach to compute these adjustments. We present the steps for the calculation of the Credit Value Adjustment (CVA) on interest rate derivatives as a practical example.

    An important part of the report will focus on the different methods to compute the expected future exposure. In this context, we consider two methods based on Monte Carlo simulations in order to compute the expected exposure. We study also the G2++ interest rate model used for the simulations and we detail the calibration process and apply it on market data.