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In wireless sensor networks (WSNs), the sink mobility along a constrained path can improve the energy efficiency. The mobile sink collects data from randomly deployed sensor nodes with constant speed has limited communication time. This causes difficulties in improving the network lifetime and efficient energy consumption. The recent advances in WSNs which leads to many new protocols specifically...
The cost of health care in first-world countries is increasing dramatically as a result of advances in medicine, a population that is becoming older and an increasingly unhealthy lifestyle. Personal health care concepts where sensors within and around the body monitor and measure all kind of physiological signals can be an addition to medicare with high benefits. This concept allows patients to stay...
When we try to use a sensor network outdoors, for purposes such as collecting information related to large-scale natural disasters and agricultural applications, it often happens that the communication distance is insufficient. Many sensor network users in Japan utilize sensor nodes that use 2.4 GHz frequency. The communication distance of these sensor nodes is short (a few hundred meters). Therefore,...
This paper presents a comprehensive approach for reliability analysis of a clusterbased sensor network. A three-level hierarchical model is used for sensor networks using fault trees and use Markov chains at the bottom level to model the reliability of individual sensor nodes. The model can capture the hardware/software failures of a sensor node, failures of clusters and base station as well as channel...
Deploying the sensor nodes at the best locations for random field reconstruction via sensor network is a fundamental task. One-dimensional random field is a stochastic process. In this paper, we first propose an optimal sensor deployment strategy for Wiener process estimation. The optimal locations for the deployed sensors are uniformly distributed in the field. In addition, we propose a suboptimal...
A wireless sensor network (WSN) is formed of low powered, battery driven electromechanical devices called sensor nodes which communicate with each other through the wireless medium. Secure data communication is a major concern for many sensor network applications. To ensure the confidentiality, it is necessary to establish a secure communication link among sensor nodes by means of cryptographic keys...
This paper describes a new tree-based routing method which can be used to connect heterogeneous networks. In the proposed method, a source node located in one network sends packets to a group of nodes in another network. In our scenario, a source node normally belongs to a mobile ad hoc network, while a group of nodes consists of sensor nodes in the specified geographical region. The source node sends...
One of the main problems in designing wireless sensor networks is to present a strategy which leads to increasing network lifetime by paying attention to energy resources. One of the most important issues in WSN is covering the region. So, the presented strategy should be able to cover all over the region by using lowest amount of sensor nodes. It is not always necessary that all the network nodes...
Program codes running on the sensor nodes need to be updated from time to time to fix bugs, tune the parameters, insert new functions, or delete useless codes. In this paper, we propose a policy-based reprogramming framework that can optimize the reprogramming process based on the execution characteristics of modules that constitute the WSN applications. To accomplish this we model the characteristics...
We study the problem of maintaining group communication between m mobile agents, tracked and helped by n static networked sensors. We develop algorithms to maintain a O(lg n)-approximation to the minimum Sterner tree of the mobile agents such that the maintenance message cost is on average O(lg n) per each hop an agent moves. The key idea is to extract a 'hierarchical well-separated tree (HST)' on...
In sensor network there are no nodes or servers that are exclusively responsible for packet forwarding and routing. Instead, sensor nodes participating in network communications perform these activities. Thus, they are vulnerable to the alteration and forgery of message in the process of packet forwarding and routing. To solve this problem, a security to ensure authentication and integrity of routing...
Sensor nodes are prone to produce faulty sample data because of poor quality and harsh environment. In this paper we put forward STCOD algorithm which uses spatial and temporal correlations between sensor nodes to distinguish faulty sample data from outlier data. STCOD algorithm includes three child algorithms which are outlier self-detection algorithm, neighbor-voting algorithm and outlier confirming...
This paper introduces an approach of media access control for reducing collisions in a heterogeneous wireless sensor network, which contains different types of sensor nodes so a sensor fusion technique can be barely applied. Data packets sent to a designated node can cause serious collision due to a funneling effect of network traffic. At lightly loaded networks, our approach uses traditional random...
Underwater Acoustic Sensor Network (UASN) is the enabling technology for real-time underwater monitoring and data collection. The costly underwater trials and unknown underwater acoustic modem infrastructures increase the need and importance of a reliable network simulator for UASNs. The underwater acoustic propagation method used in the channel modeling is the one of the determining factors influences...
Sensor nodes located on the boundary of the covered area often cause difficulties in maintaining a wireless sensor network's lifespan. This study proposes a simple method to approximate boundaries in wireless sensor networks. The approach uses only connectivity information of a network while not requiring nodes localize themselves. The proposed method divides a network into clusters and forms partial...
Sensors in sensor networks have limited energy and in large-scale sensor networks, communication between sensor nodes is necessary to cover a large monitoring region, thus energy preserving techniques are important. In this paper, we propose a hybrid protocol, which we will call collectively Chain-based LEACH (CBL) that improves the Low-Energy Adaptive Clustering Hierarchy (LEACH) to significantly...
Two main problems prevent the deployment of peer-to-peer application in a wireless sensor network: the index table, which should be distributed stored rather than uses a central server as the director; the unique node identifier, which cannot use the global addresses. This paper presents a multi-level virtual ring (MVR) structure to solve these two problems. The index table in MVR is distributed stored...
Presently available schemes for data centric storage in sensor networks usually use geographical routing protocols to communicate data between sensor nodes. However, sensor nodes are required to know their locations for them to use geographical routing protocols. In this paper, we propose a new routing protocol that does not rely on location information, and thus can be used for data centric storage...
This paper introduces a sensor network testbed, X-sensor, that integrates multiple sensor networks deployed at different sites. X-sensor provides three functionalities: (a) a sensor network search which enables users to find a sensor networks appropriate for experiment and data acquisition, (b) a sensor data archive which provides users with various sensor data acquired by sensor nodes, and (c) an...
For a connected network of sensors we consider deriving the linear update weights required by a 1-hop distributed linear averaging algorithm (denoted 1-DLA) such that average-consensus is reached when the sensor nodes simultaneously track, by linear stochastic approximation, a set of distinct Markov chains with time-varying regime. It is found the desired consensus is infeasible for any 1-hop 1-DLA...
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