共查询到20条相似文献,搜索用时 15 毫秒
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Becoming mature enough to be used for improving the quality of life, wireless sensor network technologies are considered as one of the key research areas in computer science and healthcare application industries. The pervasive healthcare systems provide rich contextual information and alerting mechanisms against odd conditions with continuous monitoring. This minimizes the need for caregivers and helps the chronically ill and elderly to survive an independent life, besides provides quality care for the babies and little children whose both parents have to work. Although having significant benefits, the area has still major challenges which are investigated in this paper. We provide several state of the art examples together with the design considerations like unobtrusiveness, scalability, energy efficiency, security and also provide a comprehensive analysis of the benefits and challenges of these systems. 相似文献
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《Computer Networks》2002,38(4):393-422
This paper describes the concept of sensor networks which has been made viable by the convergence of micro-electro-mechanical systems technology, wireless communications and digital electronics. First, the sensing tasks and the potential sensor networks applications are explored, and a review of factors influencing the design of sensor networks is provided. Then, the communication architecture for sensor networks is outlined, and the algorithms and protocols developed for each layer in the literature are explored. Open research issues for the realization of sensor networks are also discussed. 相似文献
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Wireless sensor networks for emergency navigation 总被引:2,自引:0,他引:2
Yu-Chee Tseng Meng-Shiuan Pan Yuen-Yung Tsai 《Computer》2006,39(7):55-62
In an emergency, wireless network sensors combined with a navigation algorithm could help safely guide people to a building exit while helping them avoid hazardous areas. We propose a distributed navigation algorithm for emergency situations. At normal time, sensors monitor the environment. When the sensors detect emergency events, our protocol quickly separates hazardous areas from safe areas, and the sensors establish escape paths. Simulation and implementation results show that our scheme achieves navigation safety and quick convergence of the navigation directions. We based our protocol on the temporally ordered routing algorithm for mobile ad hoc networks. TORA assigns mobile nodes temporally ordered sequence numbers to support multipath routing from a source to a specific destination node. 相似文献
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Nowadays, the major cities of the world have to solve problems that were unthinkable in past decades. Due to the population growing rate, new issues are still arising, but technology can be used to address such issues and improve life quality in big cities. In that scenario, surveillance is a highly desired service and most governments are already using different types of devices to provide high levels of security. Wireless Visual Sensor Networks (WVSN) can be used to monitor every part of a city without the cost of running cables all over it. However, there must be an efficient way to gather all information collected by the sensors and cameras, with reduced energy consumption and average latency. This work proposes a new algorithm to position multiple mobile sinks in WVSN deployed along roads and streets. A relevance-based approach was designed to position sinks closer to source nodes with higher sensing relevance, since they are expected to transmit more data packets. The proposed algorithm can detect forbidden and disconnected zones, making sure sinks will be positioned in permitted areas, which makes this approach very suitable for realistic smart city applications. 相似文献
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Fonseca M.A. English J.M. von Arx M. Allen M.G. 《Journal of microelectromechanical systems》2002,11(4):337-343
In high-temperature applications, such as pressure sensing in turbine engines and compressors, high-temperature materials and data retrieval methods are required. The microelectronics packaging infrastructure provides high-temperature ceramic materials, fabrication tools, and well-developed processing techniques that have the potential for applicability in high-temperature sensing. Based on this infrastructure, a completely passive ceramic pressure sensor that uses a wireless telemetry scheme has been developed. The passive nature of the telemetry removes the need for electronics, power supplies, or contacts to withstand the high-temperature environment. The sensor contains a passive LC resonator comprised of a movable diaphragm capacitor and a fixed inductor, thereby causing the sensor resonant frequency to be pressure-dependent. Data is retrieved with an external loop antenna. The sensor has been fabricated and characterized and was compared with an electromechanical model. It was operated up to 400/spl deg/C in a pressure range from 0 to 7 Bar. The average sensitivity and accuracy of three typical sensors are: -141 kHz Bar/sup -1/ and 24 mbar, respectively. 相似文献
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Conventional wireless home automation networks (WHANs) incorporate embedded wireless sensors and actuators that monitors and control home living environment. WHAN's primary goal is to maintain user comfort and efficient home management. Conventional WHAN lacks “intelligence” in terms of managing compound human comfort, and it deals with multitude of human comfort factors individually instead of collectively. This paper presents wireless sensor networks-based Human Comfort Ambient Intelligence system. A fuzzy-rule-based system for the measurement of human comfort index in a living space is presented. The system is evaluated and tested with simulated and empirical data. It explores the complex relationship between multiple comfort factors. The comfort factors considered here include thermal comfort, visual comfort, indoor air comfort and acoustical comfort. 相似文献
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随着机动车保有量的高速增长,停车混乱问题日益严重,各大中城市对停车实时监控及管理有迫切的建设需求。为了构建基于无线传感器网络的大规模、低成本、低功耗的停车管理系统,本文基于磁场干扰车辆检测原理,提出了一种停车检测算法,实际应用表明该算法车辆检测精度高,达到了设计要求。 相似文献
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E. Egea-López J. Vales-Alonso A. S. Martínez-Sala J. García-Haro P. Pavón-Mariño M. V. Bueno Delgado 《Personal and Ubiquitous Computing》2008,12(2):111-122
Wireless sensor networks (WSN) are designed for data gathering and processing, with particular requirements: low hardware
complexity, low energy consumption, special traffic pattern support, scalability, and in some cases, real-time operation.
In this paper we present the virtual TDMA for sensors (VTS) MAC protocol, which intends to support the previous features,
focusing particularly on real-time operation. VTS adaptively creates a TDMA arrangement with a number of timeslots equal to
the actual number of nodes in range. Thus, VTS achieves an optimal throughput performance compared to TDMA protocols with
fixed size of frame. The frame is set up and maintained by a distributed procedure, which allows sensors to asynchronously
join and leave the frame. In addition, duty cycle is increased or decreased in order to keep latency constant below a given
deadline. Therefore, a major advantage of VTS is that it guarantees a bounded latency, which allows soft real-time applications.
相似文献
M. V. Bueno DelgadoEmail: |
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主要研究了无线传感器网络路由路径的链路质量及节点剩余能量对网络整体可靠性及能效的影响,提出了无线传感器网络数据融合可靠路由的博弈论模型。该模型的求解属于NP问题,论文还提出了一种基于节点效用进行路由选择的分布式实现算法。仿真结果表明该算法能提高网络路由路径的可靠度和能效性。 相似文献
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在栅栏覆盖研究中,针对节点部署区域存在无法被监测到的穿越路径的问题,将[Voronoi]图引入栅栏覆盖,划分整个部署区域,提出了基于[Voronoi]图的无线传感器网络栅栏覆盖策略,并监测部署区域是否存在栅栏覆盖空洞,以决定节点是否通过有限移动重新部署空洞区域,实现了对栅栏部署区域的有效覆盖。仿真实验结果表明,该算法提高了对监测区域的覆盖质量,以较低能耗和较少节点构建栅栏,达到预期覆盖要求。 相似文献
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Priyanka Rawat Kamal Deep Singh Hakima Chaouchi Jean Marie Bonnin 《The Journal of supercomputing》2014,68(1):1-48
Wireless sensor network (WSN) has emerged as one of the most promising technologies for the future. This has been enabled by advances in technology and availability of small, inexpensive, and smart sensors resulting in cost effective and easily deployable WSNs. However, researchers must address a variety of challenges to facilitate the widespread deployment of WSN technology in real-world domains. In this survey, we give an overview of wireless sensor networks and their application domains including the challenges that should be addressed in order to push the technology further. Then we review the recent technologies and testbeds for WSNs. Finally, we identify several open research issues that need to be investigated in future. Our survey is different from existing surveys in that we focus on recent developments in wireless sensor network technologies. We review the leading research projects, standards and technologies, and platforms. Moreover, we highlight a recent phenomenon in WSN research that is to explore synergy between sensor networks and other technologies and explain how this can help sensor networks achieve their full potential. This paper intends to help new researchers entering the domain of WSNs by providing a comprehensive survey on recent developments. 相似文献
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Richard M. Voyles Jaewook Bae Amy C. Larson Mustafa A. Ayad 《Intelligent Service Robotics》2009,2(4):235-246
Small-size robots provide access and maneuverability in the tight confines of highly rubbled and uncertain environments such
as those encountered in Urban Search and Rescue (USAR). Small size also provides easy portability and deployability and the
potential for redundancy through multi-robot teaming. Unfortunately, small size does not diminish the data demands of these
applications, such as high-resolution imagery and other forms of high bandwidth data. Furthermore, achieving redundancy in
tight environments requires wireless operation to avoid the entanglement of tethers, but wireless communication links have
proven unreliable in such environments. The net effect of this is a set of robust networking requirements that include high
bandwidth, low latency, and low power with multi-hop routing in a sparse and highly volatile network configuration, which
has been collectively difficult to achieve. Our metric for benchmarking these requirements is a stream of uncompressed 320
× 240, 24-bit color images updated at 1 frame per second (roughly 1.8 Mbps - image compression is not the focus of this research
as it only serves to increase the possible resolution or frame rate). No existing ad hoc wireless sensor network approaches
have been able to achieve these requirements. Wi-Fi requires high power and size and does not have the latency, while Zig-bee
does not have the bandwidth. Instead, this work focuses on augmenting the Bluetooth protocol, which is master/slave based,
with a hybrid, multi-hop routing protocol. Bluetooth has the desired low power and high bandwidth characteristics, but lacks
multi-hop routing and rapid recovery. In this paper, a hybrid routing protocol for ad hoc multi-robot networking is described
that features: (1) high-bandwidth, (2) low power, and (3) low latency of data traffic for sparse, highly volatile networks—exactly
what is required for large teams of highly distributed, small-scale robots. Furthermore, this paper compares simulations and
robot implementations of different routing protocols over Bluetooth sensor networks and demonstrates the viability of our
protocol as a wireless network solution for multi-robot teams characterized by high mobility in difficult RF environments.
To the best of our knowledge, the work presented in this paper is the first attempt at comparison of different routing protocols
for real robots with physical experiments over Bluetooth sensor networks. 相似文献
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杨惠 《自动化与仪器仪表》2010,(3):89-91
主要介绍了无线传感器网络研究中所涉及到的关键性问题,特别针对当前公交信息采集及传递过程中的问题进行了详细的探讨,介绍了一种基于测距无线传感器网络的相应解决方案,具有较好的应用参考价值。 相似文献