As the capabilities of individual nodes in wireless sensor networks increase, so does the opportunity to perform more complicated tasks, such as cooperative distributed beamforming to improve the range of communications and save precious battery power during the transmission. This work presents a review of the current literature focused on implementing distributed beamformers; covering the calc...

A threat model for sensor networks and mobile ad hoc networks (MANETs) is introduced. Components that can be used to form an adversary model are developed. Threat categories, modes of use, and a variety of threats to system assets are identified, including threats to communications, infrastructure services, individual nodes and human users. Example envisaged applications of the threat model are...

Covering a bounded region with minimum number of homogeneous sensor nodes is a NP-complete problem [7]. In this paper we have proposed an id based distributed algorithm for optimal coverage in an unbounded region. The proposed algorithm guarantees maximum spreading in O( √ n) rounds without creating any coverage hole. The algorithm executes in synchronous rounds without exchanging any message. ...

A fuzzy queuing coherent hierarchical location-allocation model is developed for congested systems. The parameters of the model are approximately evaluated and stated as fuzzy-numbers. The coverage of demand nodes is also considered in an approximate manner and is stated by the degree of membership. Using the queuing theory and fuzzy conditions, a coherent hierarchical model is developed for th...

Rough set theory provides a systematic way for rule extraction, attribute reduction and knowledge classification in information systems. Some measurements are important in rough sets. For example, information entropy, knowledge dependency are useful in attribute reduction algorithms. This paper proposes the concepts of the lower and upper covering numbers to establish measurements in covering-b...

telemedicine has changed the way of health care. it is an indispensable tool in the hands of doctors to accelerate and facilitate the process of data interchange. wireless networks consist of small nodes with communications capabilities. development of wireless networks of telemedicine system is highly demanded since these networks promise a wide range of potential applications. in this paper t...

background: axillary nodal spread is an established prognostic factor in breast cancer. axillary nodal dissection and subsequent pathological examination is considered the gold standard technique of assessing the axilla for metastatic disease. a minimum of ten level i axillary nodes are required to be examined before an axillary specimen can be reliably labeled as disease free. this recommendat...

In this paper, asymptotical k-coverage of a planar sensor network with a sensing sector assigned to each node/sensor is considered. Sufficient conditions of the node density for the complete k-covering with probability approaching 1 are proposed when nodes deployment forms a planar Poisson point process and the sensing area of each node only covers a sector of a certain angle. Both fixed and va...

castleman disease (cd) is a rare, lymphoproliferative disorder of uncertain etiology. we are reporting on two cases of castleman disease. both patients were female. this disease can be found wherever lymph nodes are present. we have reported two unusual cases of castleman disease. a 29- year old woman was referred for evaluation because of a cervical lymph node, weight loss and night sweats. th...