Yazar "Kiokes, George" seçeneğine göre listele

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    Performance Evaluation of a Communication Protocol for Vital Signs Sensors Used for the Monitoring of Athletes
    (Hindawi Publishing Corporation, 2014) Kiokes, George; Vossou, Clio; Chatzistamatis, Panagiotis; Potirakis, Stelios M.; Vassiliadis, Savvas; Prekas, Kleanthis; Tuna, Gurkan
    Monitoring vital signs in athletes, mainly during training, is of crucial importance for both the athlete and the coach, in order to avoid overtraining. Overtraining is an extreme state of fatigue that forces athletes to rest for several weeks having a negative impact on athlete's performance, health, and daily life. A wireless sensor network (WSN) combines embedded computing technology with communication technology in order to collect information of the network coverage area and send it to the observer. In this paper, we present results of system's performance evaluation for the IEEE 802.15.4 standard, including the physical (PHY) layer and media access control (MAC) sublayer, in order to collect and store large sets of athletes' data as well as providing results about network values such as end-to-end delay, load, and throughput captured from global and objects statistics.
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    Performance Evaluations of Next Generation Networks for Smart Grid Applications
    (IEEE, 2015) Tuna, Gurkan; Kaya, Esra; Gulez, Kayhan; Kiokes, George; Gungor, V. Cagri
    Smart Grid (SG) can be described as the concept of modernizing the traditional electrical grid. Through the addition of SG technologies traditional electrical grids become more flexible, robust and interactive, and are able to provide real time feedback by employing innovative services and products together with communication, control, intelligent monitoring, and self-healing technologies. For being fully functional, utility operators deploy various SG applications to handle the key requirements including delivery optimization, demand optimization and asset optimization needs. The SG applications can be categorized into two main classes: grid-focused applications and customer-focused applications. Although these applications differ in terms of security, Quality of Service (QoS) and reliability, their common requirement is a communication infrastructure. In this paper, we focus on the use of Next Generation Networks (NGNs) for SG applications. We also present a detailed analysis of a NGN-based communication infrastructure for SG applications in terms of global network statistics and node-level statistics.