Wireless Sensor Networks

Abstract

Wireless sensor networks constitute the platform of a broad range of applications related to national security, surveillance, military, health care, and environmental monitoring. The coverage problem for Wireless Sensor Network (WSN) has been studied extensively in recent years, especially when combined with connectivity and energy efficiency. This paper focuses on the sensor replacement problem in wireless sensor networks consists of mobile sensors. Mobility equipped sensors are utilized to recover and maintain the overall coverage using the dynamic cluster concept. The proposed fault repair solution does not assume the localization information is available. Mobile sensor nodes make use of simple geometric operation to locate and replace dying nodes to recover or increase the existing coverage and connectivity.

Modelling the Influence of Electromagnetic Field on the User of a Wearable IoT Device Used in a WSN for Monitoring and Reducing Hazards in the Work Environment

“…The considered WSNs (using sample devices developed at CIOP-PIB) consist of a specific type of wearable device that is able to perform Wi-Fi and/or Bluetooth connections [ 15 , 16 , 17 ]. Wearable devices are worn by workers and used to alert them to any hazards, or to inform them of the necessary safety measures in the monitored area, for example to alert workers using hearing protectors against approaching vehicles.…”

“…The WSN and IoT can also be used to monitor the level of harmful agents in the work environment (such as noise), or to reduce hazards to workers’ health and safety related to environmental agents [ 15 ]. In such applications, the protected person often has to be equipped with a wearable device, either a sensor or an actuator, which is necessary to assess the monitored parameters of exposure or evaluate the hazards, or is aimed at reducing them.…”

“…WSNs and the IoT can be used for various purposes in the work environment. WSNs used for monitoring the work environment and alerting workers to hazards consist of measuring devices, wearable devices and Bluetooth beacons ( Figure 1 ) [ 15 , 16 ]. Measuring (sensor) devices are deployed in the workplace area and used to monitor harmful agents in specific areas of the workplace.…”