In present days, wireless sensor networks (WSN) have involved considerable attention of both academy and industry because of the varied range of contexts in which they could be used. The has wireless body area network (WBAN) become the most important standard for WSN, and several software and hardware platforms are built on it. The implementation and performance analysis of this standard is essential to understand the important limits of it. The simulation is one of the greatest valuable tools for protocol evaluation and prototyping design. Furthermore, network simulators play an important part to test new algorithms and other protocols built on this specification. In this paper, the performance of the WBAN MAC standard protocols has been tested. The performance of the protocols regarding power consumption, delay and packets congestion are compared using OMNet++ simulator.

We solve a machine redundancy problem in ATM centers via service policy design. Generally, redundancy has the tendency to increase the cost of service. Using the supplementary variable technique, we derive models for the customer process. A comparative analysis with certain existing models shows that machines operating under our design are better utilized. Thus, the design is a good alternative for reasons do to with managing investment resources.

The Wireless Body Sensor Network (WBSNs) is useful in providing the medical services for people who need continuous monitoring and caring and specially aged people, which are small devices implant or placed inside the human body. It works by batteries but these batteries must have high efficiency and should work through the whole age and not be replaced unless after a long period. This paper will mention energy efficient MAC protocols SensorMAC, Timeout-MAC, WiseMAC, DSMAC and Zebra-MAC which are used in WBSN's networks that work on increasing the efficiency of energy and reduce its loss.