This paper addresses the target coverage problem inWireless Sensor Networks (WSNs). Communication and sensing consume energy, therefore, efficient power management can extend network lifetime. In this paper, we consider a large number of sensors randomly deployed to monitor a number

One fundamental problem in wireless sensor networks is the coverage problem, which reflects the quality of service that can be provided by a particular sensor network. The coverage problem is defined from several points of view due to a variety

Suppose we need to watch a set of targets continuously for a required period of time, and suppose we choose any number of sensors from a fixed set of sensor types and place them at selected sites. We want to

Over-deploying sensors into a coverage region allows for coverage guarantees in the face of random deployments. Extending the lifetime of these deployments by only turning on a handful of sensors that cover the entire region is a viable means of

In Wireless Sensor and Actor Networks (WSANs), responsiveness to serious events is of utmost importance and thus, minimal latency should be experienced. In addition, since these actions can be taken at any spot within the monitored area, the actors should

Coverage is an important optimization objective in pre and post-deployment stage of a Wireless Sensor Network (WSN). In this paper, we address the issue of placing a finite set of sensors to cover an area of arbitrary geometry. Unlike many

In this paper, we propose a tele-immersion environment for the traditional Japanese crafting system, which uses a highly immersive system based on a Virtual Reality (VR) environment, such as multiple Cave Automatic Virtual Environment (CAVE) distributed at various places in

In this research, we propose and develop a remote medical care system to support nurses, care managers and care helpers during their work. The proposed system has three functions: a multipoint communication function using video images and voice, vital signs

In this paper, we present parallel algorithms for lossless data compression based on the Burrows-Wheeler Transform (BWT) block-sorting technique. We investigate the performance of using data parallelism and task parallelism for both multi-threaded and message-passing programming. The output produced by

One of the most irrelevant side effects of e-commerce technology is the development of spamming as an e-marketing technique. Spam e-mails (or unsolicited commercial e-mails) induce a burden for everybody having an electronic mailbox: detecting and filtering spam is then

In the situation of information overload we are experiencing today, conventional web search systems taking a one-size-fits-all approach are often not capable of effectively satisfy individual information needs. To improve the quality of web information retrieval, we propose a collaborative