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Research Interests:
Research Interests:
Research Interests:
Research Interests:
(Türkçe) Orman yangınları doğal yaşamı ve insan yaşamını tehdit eden önemli bir felakettir. Doğaya, ekonomiye ve tarihsel kültüre verdikleri tahribat, orman yangınlarının erken tespit edilip büyümelerinin önlenmesini önemli kılmaktadır.... more
(Türkçe) Orman yangınları doğal yaşamı ve insan yaşamını tehdit eden önemli bir felakettir. Doğaya, ekonomiye ve tarihsel kültüre verdikleri tahribat, orman yangınlarının erken tespit edilip büyümelerinin önlenmesini önemli kılmaktadır. Bir yangın tespit sisteminin başarısını, yangını en kısa zamanda ve hatasız tespit etme özelliklerine göre değerlendirebiliriz. Özellikle erken yangın tesbiti ve yüksek çözünürlüklü yangın takibi konularında, var olan yangın önleme sistemlerine oranla kablosuz algılayıcı ağların (KAA) daha başarılı olduğu görülmüştür. Belirli bir orman bölgesine sıklıkla yerleştirilen çok sayıda algılayıcı sayesinde, çeşitli noktaların sıcaklık ve nem gibi bilgileri gerçek zamanlı ölçülüp yangınla mücadele merkezlerine hızlıca iletilebilmektedir. Bu çalışmada, FP7 FIRESENSE projesi kapsamında önerilen, KAA’ların yeteneklerini ve başarımını arttırmak amacıyla farklı tip cihazlardan oluşan KAA temelli heterojen bir yapının başarımını, gerçekçi yangın yayılım ve ağ benz...
Research Interests:
Mobile sinks are proposed for load-balancing and achieving uniform energy-consumption in wireless sensor networks. However, advertising the location of the mobile sink to the network introduces an overhead in terms of energy consumption... more
Mobile sinks are proposed for load-balancing and achieving uniform energy-consumption in wireless sensor networks. However, advertising the location of the mobile sink to the network introduces an overhead in terms of energy consumption and packet delays. In this paper, we propose a new routing protocol, Ring Routing, which aims to minimize this overhead while preserving the advantages of mobile sinks. Simulation results show that the performance of Ring Routing is not very far from the lower bound in terms of delay and energy consumption.
The concentration of data traffic towards the sink in a wireless sensor network causes the nearby nodes to deplete their batteries quicker than other nodes, which leaves the sink stranded and disrupts the sensor data reporting. To... more
The concentration of data traffic towards the sink in a wireless sensor network causes the nearby nodes to deplete their batteries quicker than other nodes, which leaves the sink stranded and disrupts the sensor data reporting. To mitigate this problem the usage of mobile sinks is proposed. Mobile sinks implicitly provide load-balancing and help achieving uniform energy-consumption across the network. However, the mechanisms to support the sink mobility (e.g., advertising the location of the mobile sink to the network) introduce an overhead in terms of energy consumption and packet delays. With these properties mobile sink routing constitutes an interesting research field with unique requirements. In this paper, we present a survey of the existing distributed mobile sink routing protocols. In order to provide an insight to the rationale and the concerns of a mobile sink routing protocol, design requirements and challenges associated with the problem of mobile sink routing are determined and explained. A definitive and detailed categorization is made and the protocols' advantages and drawbacks are determined with respect to their target applications.
In a typical wireless sensor network, the batteries of the nodes near the sink deplete quicker than other nodes due to the data traffic concentrating towards the sink, leaving it stranded and disrupting the sensor data reporting. To... more
In a typical wireless sensor network, the batteries of the nodes near the sink deplete quicker than other nodes due to the data traffic concentrating towards the sink, leaving it stranded and disrupting the sensor data reporting. To mitigate this problem, mobile sinks are proposed. They implicitly provide load-balanced data delivery and achieve uniform-energy consumption across the network. On the other hand, advertising the position of the mobile sink to the network introduces an overhead in terms of energy consumption and packet delays. In this paper, we propose Ring Routing, a novel, distributed, energy-efficient mobile sink routing protocol, suitable for time-sensitive applications, which aims to minimize this overhead while preserving the advantages of mobile sinks. Furthermore, we evaluate the performance of Ring Routing via extensive simulations.