نتایج جستجو برای: dynamic wireless sensor networks

تعداد نتایج: 979621  

Journal: :journal of communication engineering 0
mohammad ehdaie parsa sharif research center nikolaos alexiou kth panos papadimitratos kth

sybil attacks pose a serious threat for wireless sensor networks (wsn) security. they can create problems in routing, voting schemes, decision making, distributed storage and sensor re-programming. in a sybil attack,the attacker masquerades as multiple sensor identities, that are actually controlled by one or a few existing attacker nodes. sybil identities are fabricated out of stolen keys, obt...

Journal: :journal of advances in computer research 2015
majid hatamian hamid barati ali movaghar

wireless sensor network includes a large number of nodes which are distributed in a geographical location. the essential fact about wsn is that energy of nodes is limited. therefore, presenting proper solutions as an optimized routing is crucial to equally use energy of all nodes. in this paper we propose a method which performs routing in wsns using greedy approach. it is able to choose optimu...

Journal: :journal of advances in computer research 2014
maryam javaherian abolfazl t.haghighat

nowadays, wireless sensor network has been of interest to investigators and the greatest challenge in this part is the limited energy of sensors. sensors usually are in the harsh environments and transit in these environments is hard and impossible and moreover the nodes use non- replaceable batteries. because of this, saving energy is very important. in this paper we tried to decrease hard and...

Journal: :journal of computer and robotics 0
fereydoon abdi faculty of computer and information technology engineering qazvin branch islamic azad university qazvin, iran abolfazl toroghi haghighat faculty of computer and information technology engineering qazvin branch islamic azad university qazvin, iran

wireless sensor networks attracting a great deal of research interest. accurate localization of sensor nodes is a strong requirement in a wide area of applications. in recent years, several techniques have been proposed for localization in wireless sensor networks. in this paper we present a localization scheme with using only one mobile anchor station and received signal strength indicator tec...

Journal: :international journal of smart electrical engineering 2013
elham yazdankhah fardad farokhi reza sabbaghi-nadooshan

wireless sensor networks, due to the characteristics of sensors such as wireless communication channels, the lack of infrastructure and targeted threats, are very vulnerable to the various attacks. routing attacks on the networks, where a malicious node from sending data to the base station is perceived. in this article, a method that can be used to transfer the data securely to prevent attacks...

Journal: :international journal of smart electrical engineering 0
iman khandani electrical engineering department, islamic azad university, central tehran branch reza sabbaghi-nadooshan electrical engineering department, islamic azad university, central tehran branch fardad farokhi electrical engineering department, islamic azad university, central tehran branch

wireless sensor networks(wsn) have unique properties that distinguished them from other wireless networks and have special challenges. not-chargeable, not-changeable and limited power supplies of sensor nodes is the most important challenge of this networks, and if the power supply of node expired, a part of data maybe lost. because of the importance of covers in wireless sensors, in this work ...

Journal: :journal of advances in computer research 2015
mohammad karim sohrabi elahe khorramian

sensor networks generally consist of a very great number of sensor nodes which will be spread into a vast environment and aggregate data out of it. the sensor nodes are afflicted with some limitations as follows memory, reception, communication as well as calculation capability, and battery power. the transmission of a great amount of extra data increases data transmission and proportionally in...

ژورنال: محاسبات نرم 2013
رحیمی نسب, مجید, رضایی نژاد, مهدی, موسوی, سید عبدالمجید,

At the present, energy aware routing is one of the most important research topics in wireless sensor networks. Increasing network lifetime is the most challenging need in these networks. In this study, in order to increase network lifetime, we aim to introduce a harmony search algorithm as a successful meta-heuristic algorithm for routing in the wireless sensor networks. In customizing the algo...

Journal: :journal of advances in computer research 0

adequate coverage is one of the main problems for distributed wireless sensor networks and the effectiveness of that highly depends on the sensor deployment scheme. given a finite number of sensors, optimizing the sensor deployment will provide sufficient sensor coverage and save power of sensors for movement to target location to adequate coverage. in this paper, we apply fuzzy logic system to...

Donald Adjeroh Mohammad Hossein Yaghmaee Nazbanoo Farzaneh Bahalgardi

Wireless Body Sensor Networks (WBSNs) involve a convergence of biosensors, wireless communication and networks technologies. WBSN enables real-time healthcare services to users. Wireless sensors can be used to monitor patients’ physical conditions and transfer real time vital signs to the emergency center or individual doctors. Wireless networks are subject to more packet loss and congestion. T...

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