International Journal of Computer Networks and Applications

247-253

Authors: Gurkan Tuna, Resul Das, Ayse Tuna

Even if the elderly and disabled need the assistance of their families, parents, and healthcare providers, they prefer to live in their homes instead of assisted-living centers. Therefore, their health and activities must be remotely monitored so that in case of an urgent unexpected situation, immediate help can be provided. In this respect, this paper proposes a wireless sensor network-based health monitoring system for the elderly and disabled, and focuses on its development steps. The proposed system is composed of low-cost off-the-shelf components and enables the monitoring of important health parameters of the elderly and disabled. Since it is a wireless and portable health monitoring solution, it can be a valuable remote monitoring tool for health care service providers by reducing the cost of their services. It can be combined with data mining solutions and/or machine learning techniques to offer novel features such as pattern extraction and behavior analysis.

261-266

Authors: Wen-Shiung Chen, Lili Hsieh, Ying-Neng Hsieh

Push-to-Talk (PTT) is a service that allows users using mobile phones in a way like walkie-talkie. All big telecommunication vendors and operators consider PTT an emerging application. 3GPP and OMA regulate the PTT specifications on the basis of Session Initiation Protocol (SIP) to assure interoperability. However, current PTT services are dedicated to cellular phones. We would like to realize PTT services with popular 802.11 wireless networks and VoIP services. Thus, in this paper, we implement a PTT system that works in 802.11 networks. Moreover, we interconnect it with GPRS network to compare the performance in-between these two heterogeneous networks. Simulation result shows that the latency to hear the talk calling from GPRS network to 802.11g network is only about 1~2 seconds while that of from 802.11g network to GPRS network is 6 seconds.