wireless sensor networks (wsns) have many applications in the areas of commercial, military and environmental requirements. regarding the deployment of low cost sensor nodes with restricted energy resources, these networks face a lot of security challenges. a basic approach for preparing a secure wireless communication in wsns, is to propose an efficient cryptographic key management protocol be...

This thesis presents the difficulties and solutions to local processing, secure transmission, and central processing, which are the three stages of sensor network protocols. The thesis is organized into three chapters, each focusing on a particular real-life application that highlights the challenges of a particular stage. The first chapter uses body sensor network as an example to show the imp...

Wireless sensor networks have opened opportunities for new applications and attracted users from domains beyond computer system design. Sensor network design is challenging. It is generally an ad hoc process carried out by embedded system experts. In this dissertation, we argue that human efforts necessary to the design of sensor networks can be reduced with the help of high-level specification...

Hitherto, instrumentation network design methodologies have been based solely upon sensor capital costs. Within this framework the cost of new instrumentation is minimized subject to constraints indicating the desired level of performance. While, these formulations account for the cost of a network, they do not reflect the potential benefit of adding sensors. To capture this potential profit, w...

The paper addresses combinatorial approach to design of modular wireless sensor as composition of the sensor element from its component alternatives and aggregation of the obtained solutions into a resultant aggregated solution. A hierarchical model is used for the wireless sensor element. The solving process consists of three stages: (i) multicriteria ranking of design alternatives for system ...

Carpal tunnel syndrome (CTS) refers to a class of injuries characterized by compression of the median nerve in the carpal tunnel. CTS injuries cause pain, weakness, and numbness in the hands and are common among video gamers and workers that maintain their wrists in ergonomically unfavorable positions. Current CTS qualification methods are well documented, whereas the condition of the hand musc...

Image data holds a large amount of different context information. However, as of today, these resources remain largely untouched. It is thus the aim of this paper to present a basic technical framework which allows for a quick and easy exploitation of context information from image data especially by non-expert users. Furthermore, the proposed framework is discussed in detail concerning importa...

In this paper, a development of sensor node for environment monitoring is described. The Reconfigurable System-On-chip (RSOC) technology is used to integrate the node’s main components on FieldProgrammable Gate Array (FPGA) chip. The main components required to support the environmental applications such as pixels sensor, reconfigurable processing core, and a tiny solar unit for recharging node...

We present a compact optical design for a multireference Shack-Hartmann-based wavefront sensor (WFS) for multiconjugate adaptive optical systems. The key component of this WFS design is a field lenslet array that separates the exit pupil images in the sensing plane for all reference sources. An analytical method for WFS optical design is presented, and the optimal strategy for selecting optical...

Due to the nature of many applications, it is difficult with present technology to use a single type of sensor to automatically, accurately, reliably, and completely measure or map, in three-dimensions, objects, sites, or scenes. Therefore, a combination of various sensor technologies is usually the obvious solution. There are several 3-D technologies, two of which; digital photogrammetry and t...