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In wireless sensor networks, each wireless sensor node records events occurred in its observation area with their observation time. Each wireless sensor node possesses its own local clock whose drift and offset are generally different from the others. In addition, it is difficult for the wireless sensor nodes to adjust drifts and offsets of their local clocks since transmission delay of messages between...
The Raspberry Pi has become one of the most popular devices used in the internet of things studies because of its flexibility and affordability for prototyping purposes. It has found its niche in wireless sensor networks as it can function both as sensor node and router node just by adding wireless adapter. Studies have employed the Raspberry Pi as WSN mesh node and sensor node. These studies looked...
In consequence of advances in wireless communication, digital systems and micro-electronic-mechanical system technologies wireless sensor networks (WSNs) have been developed and applied in lots of different real-world applications such as military, industrial, environmental, health, etc. Due to their limited resources and constraints, WSNs face with several problems such as energy consumption, node...
Wireless sensor networks are expected to be critical platforms for IoT systems consisting of various wireless sensor nodes without continuous battery power supply. Due to limited transmission power, wireless multihop transmissions of sensor data messages to the sink node are mandatory. Thus, low-power forwarding based on intermittent communication in each intermediate wireless sensor node is required...
Maintaining constant communication between mobile entities distributed across a large geographical area is a crucial task for many commercial and military applications. For example when troops are deployed in hostile or sensor deprived environments, maintaining radio contact with a base station would increase the efficiency of coordinating the deployment, yet maintaining communications should not...
A group of wireless devices with the ability to sense physical events (sensors) or to perform relatively complicated actions (actors), is referred to as Wireless Sensor and Actor Network (WSAN). In WSANs, sensors gather information about the physical events, while actors perform appropriate actions upon the environment, based on the sensed data shared by sensors. In order to provide effective sensing...
In Wireless Sensor-Actor Networks (WSANs), sensors probe the surroundings and forward their data to actors. Actors collaboratively respond to achieve predefined application mission. However, since the environment where WSANs are used is usually complex and harsh, actors cannot communicate with its neighbor actors occasionally due to the failure of an actor. Although the recent work provides a connection...
Lifetime is a relevant issue of a successful Wireless Sensor Network deployment, due to the fact that nodes in WSN have limited resources such as energy, computation capacity, memory size, and antenna coverage. But energy is the most important among them, because all these resources depend on energy. To reduce energy consumption some approaches propose solutions based on link layer and/or network...
IRDT (Intermittent Receiver-driven Data Transmission) realizes low-power communication between neighbor sensor nodes. This paper proposes combination IRDT-GEDIR of IRDT and GEDIR which is an on-demand location-based ad-hoc routing protocol. Here, for shorter end-to-end transmission delay, pseudo speed of data message transmission is applied for next-hop selection in an intermediate node and on-line...
Node mobility has been exploited in many context of Mobile Sensor Networks (MSNs) and Wireless Sensor and Actor Networks (WSANs) to improve network performance. In particular, network partitioning due to node failures has been addressed via repositioning of some of the mobile nodes. In all of these studies, the application terrain is assumed to be obstacle free and the movements are performed by following...
IRDT (Intermittent Receiver-driven Data Transmission) realizes low-power communication between neighbor sensor nodes. This paper proposes combination IRDT-GEDIR of IRDT and GEDIR which is an on-demand location-based ad-hoc routing protocol. Here, pseudo speed of data message transmission is applied for next-hop selection in an intermediate node and on-line determination of its next-hop node is realized...
Advances in the semiconductor technologies and the development of the wireless sensor network technology it became possible to build miniature and reliable biomedical sensors. The rapid growth in wireless communication, low power circuits and biomedical sensors has enabled new generation of wireless sensor network. These networks are often termed as Body Area Network. A mesh of such biosensors can...
Wireless sensor and actor networks (WSANs) consist of fixed sensor nodes and mobile actor nodes. Data is generated at the sensor nodes, and collected at the more powerful actor nodes. We consider the problem of finding the location for K actor nodes such that every sensor node is within d-hop from an actor node, where K and d are parameters of the problem. Our approach distinguishes itself in obtaining...
Wireless sensor networks are often only used to transmit monitored data to a central processing unit. However, they also offer the possibility to establish local intelligence and allow localized problem solutions. Existing monitoring systems have the following main drawbacks: centralized architecture that requires expensive infrastructure to run it, centralized decision making that makes reactions...
Wireless sensor and actor networks (WSANs) can be considered as a combination of sensor network and actor network in which powerful and mobile actor nodes can perform application specific actions based on the received data from the sensors. As most of these actions are performed collaboratively among the actors, so the connected inter-actor network is important to the effectiveness of WSANs. However,...
Ad hoc networks are expected to have some critical connectivity properties before partitioning. Timely partition prediction signals action for improving fault tolerance and performing some data or service replication so that the network can continue functioning after partition does occur. This article surveys existing prediction concepts and discusses their scalability, simplicity, correctness, speed,...
The sensor deployment is a critical step in the implementation of wireless sensor networks. During the deployment, sensors are hoped to be deployed as evenly as possible, so that the network can monitor a bigger area. The evenness is an important metric of the deployment of a network. We formulate and investigate an Evenness Measurement problem in a two-dimensional continuous space. We propose a measurement...
Traditional wireless sensor networks (WSNs) act mostly as data collection and aggregation networks and do not possess the capability of interaction with ambient environment. But lots of application scenarios need WSNs interacting with ambient environment, such as fire prevention and control, etc.. According to most application scenarios, the response speed of actor nodes determines the effectiveness...
Node localization plays a key role in the validity of WSN applications. To improve the precision of WSN node localization, A localization algorithm is studied which is based on Maximum Likelihood Estimation (MLE). A new RSSI ranging model is proposed that is depicted by two empirical models. The optimal number of reference WSN nodes for localization are studied. The test results show that the error...
Wireless sensor networks are designed based on cluster robots in this paper, the wireless network location technology are researched, the methods of wireless network localization that based on trilateral localization method, ultrasonic ranging technology and RSSI ranging technology; The experiments show that accuracy of RSSI ranging localization is not very high, It can be used estimilate roughly...
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