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The European Free Electron Laser (XFEL) consists of a large and complex plant, with many cost intensive and technological high-end components. It is therefore important that the XFEL can be operated reliably and safely using exception handling and fault detection systems. A crucial part of the system are the superconducting cavities for which especially quenches, i.e. the break down of the superconductivity...
In the last three decades, engineering education research (EER) has made remarkable progress towards a field of interdisciplinary scholarship. This paper defines EER by developing a keyword-based scheme for exploring EER-related scientific publications and collaboration. The keyword-based scheme refers to a conceptual framework we have developed for generating a parsimonious list of keywords which...
In a large variety of industrial scale processes, fixed or mobile sensors are typically deployed in large-scale vessels to monitor parameters such as temperature, pressure and chemical concentration. When these vessels are cluttered with obstacles, e.g. large cooling ponds cluttered with nuclear waste containers, it becomes increasingly difficult for the sensors to estimate their position. The acoustic...
In this paper, we propose a robust multilateration algorithm for localizing sensor nodes in cluttered environments where the estimated distances between an unlocalized node and reference nodes with known coordinates may contain large errors due to non line of sight signal propagation. We show that the traditional least squares multilateration is severely affected even if one of the measured distances...
As the demands of the handheld devices and pervasive services are increasing, the issues of security have alarmingly risen. One can wonder about the pervasive services to be free of every security flaw. The paper suggests a mechanism for a trust based ad-hoc authentication with a distributed trust based mechanism and defined security policies related to access control for pervasive devices. The openness...
Liver diseases are among the leading causes of death worldwide. The most useful approach for controlling the growth of diseases to reach at severe condition is to treat these diseases at the early stages. Early treatment requires early diagnosis, which needs an accurate and reliable diagnostic procedure. The aim of this study is to develop a computer-aided diagnostic system to achieve aforementioned...
In this paper, we propose an anchor free localization mechanism for wireless sensor networks. Our algorithm is based on a graph drawing approach and uses inter-node distances to localize sensor nodes in a local coordinate system up to a global translation, rotation and reflection without any absolute reference positions such as GPS or other anchor nodes. We show that it is possible to avoid folds...
The environmental impact of herbicide utilization has stimulated research into new methods of weed control, such as selective herbicide application on highly infested crop areas. This paper deals with the development of an algorithm which calculates angular cross sectional intensity of an image that is used for the weed classification. This algorithm is specifically developed to classify images into...
The availability of simulators and emulators that are tailored for wireless sensor networks (WSNs) is a necessary step in allowing accurate evaluation, but simply having the right tools is not sufficient to ensure that the results of experiments actually correspond to what might be expected in realistic deployments. The critical issue is what models are available in these tools, and if these are used...
In this paper the concept of stability, in the design of microwave transistor amplifiers is discussed along with various methods of stabilizing the potentially unstable device. The various techniques are then illustrated with the help of a design example utilizing the parameters of a typical small signal microwave BJT
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