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A Virtual Sensor estimates product objective or process conditions using mathematical models rather than and sometimes in conjunction with physical sensors. These mathematical models use other physical sensor readings to calculate the estimated property or condition. Virtual sensor may provide flexibility, cost effective solutions, promote diversity, ensure security and increase manageability.
Wireless ad-hoc sensor networks and routing data in them is a significant research area. The objective of this paper is to examine resource depletion attacks at the routing protocol layer, which attempts to permanently disable network nodes by quickly draining their battery power. This type of attack is called as vampire attack. Vampire attacks are very difficult to detect because they attack the node only by sending protocol-compliant messages.
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Wireless sensor networks consist of sensor nodes with radio, processor, memory, battery and sensor hardware. With widespread deployment of these devices one can precisely monitor the environment. Sensor nodes are resource constrained in terms of radio range, processor speed, memory and power. WSNs are mostly unguarded and the wireless medium is broadcast. This makes them more vulnerable to attacks. Without proper security measures, an enemy can launch various kinds of attacks in hostile environments. These attacks can disrupt the normal working of WSNs and can defeat the purpose of their deployment. Therefore security is an important aspect of these networks. WSNs are often deployed to monitor important emergency events, such as forest fire and battlefield monitoring. System Monitoring Modules (SMM) should be integrated with Intrusion Detection Modules (IDM).
Sign language: a natural, linguistically complete and a primary medium for the humans to interact. Nowadays, this language is prevalent amongst the deaf, dumb or blind individuals. However, with the conventional sign language not known to the signers, it adversely affects their interpersonal relationships in the society. There is a need of much more sophisticated method than communication through interpreters or writing. Our aim is to design a system in which sensor glove is used to capture the signs of the American Sign Language (ASL) and translate them to English displayed on a LCD.
Due to the wide range of application of Wireless Sensor Networks (WSN) the past few years have witnessed the potential use of it and also become a hot research area now a days. One the main degradation of WSN is that sensor nodes are battery powered and deployed in harsh environment so it is not possible to recharge or replace the batteries all the time the node fails or dead. WSN are used in various applications like environment monitoring, health care, military, industrial control units and in various other environments. Routing protocols developed for various other adhoc networks such as MANET, VANET etc can’t apply directly in WSN due to energy constrains of nodes. It is proved that sensor nodes require much energy to transmit data rather than sensing thus routing protocol developed for WSN should be efficient so that the network lifetime can be prolonged. In this paper, a survey on various Clustering routing protocols has been done indicating their merits
Different themes emerged from the lived experiences of the 36 co – researchers, here referred to individually with their fictitious names. The following are the themes and their respective meaning: A) Desensitizing information - Initial reactions of the condition: counting the days left, full of disbelief, unbearable, unacceptable, Why me!, What have I done?, and difficult to explain; (B) Holistic disease experience – individual symptomatic experience: Fluid restrictions, Easy fatigability, Vomiting, fever and abdominal pain, Edema /heaviness, Gasping for breath, Increased / decreased blood pressure, fragile, easily fatigued and weak, lost my appetite, think more often, afraid to die and difficulty urinating, weak and body pains; (C) racing against the waves - coping with the illness and support systems