A home automation system usually contains a set of tools that users use to control devices in their homes, often remotely. These devices often include but are not limited to light switches, thermostats, thermometers, window blinds, and climate controls. The potential for these kinds of systems is huge because of the sheer number of devices that could be controlled and managed with minimal and inexpensive extra hardware. Many of the appliances in a normal home could benefit from being connected to a system that allows the owner to manage and control the devices in their home. Thus the number of potential devices is orders of magnitude larger than the number of homes connected to the system. There are several systems on the market that provide systems to monitor and control a home environment, however these systems only support specific in system devices. This uncovers a problem where a homeowner only has the opportunity to use specific products that fit into these systems. By introducing an open platform for the public that are not bound to any system we can allow more devices to be integrated in the home and contribute to further development of smarter homes. The goal with this project was to provide a scalable open platform with the possibility of asynchronous updating. This has been done by implementing multiple logical parts to both provide a web interface for the user and to allow us to handle communication and storage of data. All these parts are linked together to form a system of servers that handles all background operations. This thesis discusses and presents implementations of all of these servers, how they are implemented, communicate with each other, provide secure connections and how they can scale with increasing usage. In this process we also discuss and present techniques that were used, how to use them and their benefits, to help us reach our goal. / ”Home automation” syftar till ett system som låter användaren kontrollera och styra olika apparater i hemmet, ofta sker detta utifrån. Dessa apparater inkluderar, men är inte begränsade till ljusbrytare, termostater, termometrar, persienner eller klimatanläggningar. Potentialen för ett sådant system är enormt då antalet apparater som skulle kunna övervakas med endast minimal och billig extra hårdvara är stort. Många av dessa apparater kan dra nytta av att vara ansluten till ett system som gör det möjligt för ägaren att hantera och styra enheter i deras hem. Antalet apparater är därför mångdubbelt fler än antalet hem som är kopplade till systemet. Det finns flera system på marknaden som ger användaren ett sätt att övervaka och styra en hemmiljö, men dessa system är ofta låsta och stödjer bara specifika enheter. Genom att införa en öppen plattform för allmänheten som inte är bunden till något system, kan vi tillåta att fler enheter kan integreras i hemmet och bidra till ytterligare utveckling av smartare hem. Målet med detta projekt var att skapa en skalbar öppen plattform med möjlighet till asynkron uppdatering. Detta har gjorts genom att implementera flera logiska delar för att förse användaren med ett webbgränssnitt och för att tillåta oss hantera kommunikation och lagring av data. Alla dessa delar är sammanlänkade för att bilda ett system av servrar som hanterar alla bakgrundsprocesser. Denna avhandling diskuterar och presenterar implementeringar av alla dessa servrar, hur de genomförs, kommunicera med varandra, ger säkra anslutningar och hur de kan skala med ökad användning. I denna process diskuterar och presenterar vi de tekniker som använts, hur man använder dem och deras fördelar.

SyfteSyftet med denna studie var att undersöka passningsprecisionen hos ungdoms- och juniorishockeyspelare (15 – 18 år) som under den gångna säsongen var aktiva inom serierna ”Elit” eller ”Division 1” i antingen U16, J18 eller J20.MetodFör att undersöka passningsprecision i ishockey så designades två tester. Testerna gick ut på att försöka träffa en tre centimeter bred målpinne med en puck från ett avstånd på 15 meter. Fem spelare genomförde två test med olika komplexitetsnivåer, en i rörelse samt en stillastående. Varannan passning slogs med forehand och varannan med backhand. Passningarna genomfördes i serier om tio passningar (5 forehand och 5 backhand). På båda stationerna genomförde varje spelare fem serier, det vill säga totalt 50 passningar (25 forehand, 25 backhand).ResultatResultatet i denna studie visade att det fanns en signifikant skillnad i passningsprecisionen mellan forehand och backhand i såväl stillastående (p < 0,001) som i rörelse (p = 0,009). Däremot var det ingen signifikant skillnad beroende av komplexitetsnivå för vare sig forehand (p = 0,29) eller backhand (p = 0,22).SlutsatserUtifrån det resultat som framkom så kan man se att passningshållet (forehand/backhand) påverkar passningsprecisionen. Samtliga spelare hade en högre precision på sin forehandsida jämfört med backhand oberoende av komplexitetsnivå. / PurposeThe purpose of the study was to measure passing precision among youth- and junior ice hockey players between 15 and 18 years of age, who in the past season played at either “elite” or “Division 1” level in U16, J18 or J20.MethodsTo measure passing precision in ice hockey, two tests were designed. The tests consisted of a player trying to hit a three-centimeter-wide pin by passing a puck from 15 meters away. Five players did the test that were divided into two different levels of complexity, one in forward motion and one standing still. The players hit a total of ten passes divided into five forehand passes and five backhand passes, they took turns in hitting forehand and backhand one by one. In total, the players did five series of ten passes on each station, a total of 50 passes divided into 25 forehand passes and 25 backhand passes.ResultsThe result of this study showed that there was a significant difference in passing precision between forehand passes and backhand passes, regardless off whether the pass was played in motion (p = 0,009) or standing still (p < 0,001). However, the test did not show any significant difference between the different levels of complexity on either forehand (p = 0,29) or backhand (p = 0,22).ConclusionsBased on the results from this study, you can see that the way you hit the pass (forehand/backhand) effects the passing precision. All players had a higher precision on their forehand than their backhand, regardless of level of complexity.

As manufacturers introduce new machines with more cores, more NUMA-like architectures, and more tightly integrated heterogeneous processors, the traditional abstraction of a monolithic OS running on a SMP system is encountering new challenges.  One proposed path forward is the multikernel operating system.  Previous efforts have shown promising results both in scalability and in support for heterogeneity.  However, one effort\'s source code is not freely available (FOS), and the other effort is not self-hosting and does not support a majority of existing applications (Barrelfish). In this thesis, we present Popcorn, a Linux-based multikernel operating system.  While Popcorn was a group effort, the boot layer code and the memory partitioning code are the author\'s work, and we present them in detail here.  To our knowledge, we are the first to support multiple instances of the Linux kernel on a 64-bit x86 machine and to support more than 4 kernels running simultaneously. We demonstrate that existing subsystems within Linux can be leveraged to meet the design goals of a multikernel OS.  Taking this approach, we developed a fast inter-kernel network driver and messaging layer.  We demonstrate that the network driver can share a 1 Gbit/s link without degraded performance and that in combination with guest kernels, it meets or exceeds the performance of SMP Linux with an event-based web server.  We evaluate the messaging layer with microbenchmarks and conclude that it performs well given the limitations of current x86-64 hardware.  Finally, we use the messaging layer to provide live process migration between cores. / Master of Science

Ray tracing is widely used technique for realistic rendering of computer scenes. Its major drawback is time needed to compute the image, therefore it's usually parallelized. This thesis describes parallelization and ray tracing in general. It explains the possibility of how can be ray tracing parallelized as well as it defines the problems which may occur during the process. The result is parallel rendering application which uses selected ray tracing software and measurement of how successful this application is.

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This study investigates how teachers in the Swedish school subject textile sloyd uses andpasses theoretical knowledge in a subject where the practical aspects usually have the upperhand. In addition, the study also investigates how teachers interpret how their studentsexperiences the theoretical parts of the subject. The study was conducted using a survey postedin a Facebook group for sloyd teachers and was answered by 44 respondents. Lev Vygotskijs sociocultural theory was used to examine the results and the result was divided into the themescontent, communication, and response. The study shows that all responding teachers findstheory important and that it’s a part of the sloyd curriculum that can’t be neglected, eventhough several respondents conclude that the practical work must get majority of attention inthe subject. Further the study shows that communication of theoretical knowledge in theclassroom is mostly done through showing film. Regarding how the students find the use oftheory in sloyd, the study only examined how the teachers evaluate students’ attitude, and notthe students themselves. Teachers find that students commonly have a good attitude towardsthe theoretical parts of the education, even though its common that students rather would dopractical work.

This essay explores early twentieth century African American literature to investigate issues related to identity formation. It uses W.E.B. Du Bois’s The Souls of Black Folk and Frantz Fanon’s Black Skin, White Masks to introduce and define the socio-psychological concept of the moment of knowing, an original component of this work. The concept is composed of two occurrences: alienation and self-alienation, which can be observed and examined in nonictional and fictional texts. Within the framework of multicultural theory, the moment of knowing along with double-consciousness are explored in a close reading of Nella Larsen’s 1929 novel Passing. In conclusion, the moment of knowing is shown to be a significant part of African American identity formation, and the central characters in Larsen’s work are revealed as psychologically and socially scarred as a result of their inability to cope with their African American identity.

Passing, both standard and reverse, is the process of changing ethnicity. The methodology of reverse passing varies, but claiming "no color" is ineffective in fact and fiction as can be seen in James McBride's The Color of Water, Shirlee Taylor Haizlip's The Sweeter the Juice, Danzy Senna's Caucasia, and Rosellen Brown's Half a Heart. The characters in these texts attempt indefinite ethnicity by denying color and are prone to restlessness and failure until they accept racial duality.

Many studies have examined the level of risk perceived by cyclists when they are being passed by motor vehicles (e.g., Beck et al., 2021; Rasch et al., 2022) and others have reported that drivers with negative attitudes towards cyclists self-report higher levels of driver aggression towards cyclists (e.g., Delbosc et al., 2019; Fruhen & Flin, 2015; Haworth et al., 2018). However, self-reported behaviours may not reflect a driver's observable behaviour (Fruhen et al., 2019). Lamondia and Duthie (2012) proposed that LPD is an indicator of the driver's degree of respect for a cyclist but other driver factors may also be important. Little is known about how accurately drivers canjudge lateral passing distance (Haworth et al., 2018) or whether some unsafe passes could simply reflect poor driver understanding of cyclist needs when sharing roadways. The general finding that LPDs are lower when there are parked cars or oncoming vehicles (Rubie et al., 2020), suggests that drivers may leave inadequate LPDs if they perceive that moving into the opposite side of the road poses a risk to themselves or their vehicle. Rasch et al. (2022) is one of the few studies to measure drivers' perceptions of the risk to themselves in overtaking cyclists. Some studies have examined how different motor vehicle speeds influence perceived risk of the passing motor vehicle for cyclists (Apasnore et al., 2017; Garcia et al., 2020; Llorca et al., 2017; Rasch et al., 2022) or drivers (Rasch et al., 2022), generally finding that cyclists perceive higher motor vehicle speeds are more hazardous. This paper examines (1) whether negative attitudes towards cyclists influence perceptions ofrisk: to the cyclist in passing events, (2) the factors associated with driver perceptions of the risk to themselves, and (3) if increases in motor vehicle speed are associated with higher levels of perceived risk to the cyclist and driver in the passing event. [From: Introduction]

A new safety application, as part of ITS Advanced Rural Transportation System (ARTS), has been developed to be deployed on a two-lane rural road (Route 114), in Southwest Virginia. The route segment under study is subject to significant head-on accidents, as a result of two main conditions: 1- Illegal passing maneuvers crossing solid yellow line, and 2- A short passing sight distance due to the road vertical profile. The main objective of this research is to design a video detection-based warning system by installing an affordable and efficient system on the vertical crest curve on Route 114, capable of performing the following two main functions: 1.Detect vehicles that attempt to violate the no-passing zone restriction (i.e. when crossing into the opposing direction). 2.Warn the drivers violating the restriction in order to discourage them from continuing their maneuvers. System architecture as well as detailed system design was developed. A system simulation was conducted with the use of a special software program written with MATLAB. The simulation was applied for both "with" and "without" the system cases. The simulation runs showed that the system could virtually eliminate all head-on collisions, should violators obey the early warning messages displayed. Several sensitivity tests were made for different scenarios. Finally, the viability of the system was evaluated from economic point of view. The financial analysis revealed high economic indicators. / Ph. D.