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Energy Efficient Modulation Techniques for Fault Tolerant Two-Tiered Wireless Sensor Networks  [cached]
M.Sheik Dawood,Sajin Salim,S.Sadasivam,G.Athisha
Journal of Asian Scientific Research , 2012,
Abstract: A Wireless Sensor Network is composed of hundreds or thousands of nodes that can be equipped with limited energy resources but can still be used over an extensive set of diverse applications such as environment monitoring, healthcare, homeland security, military surveillance, manufacturing, and industry automation. In a safety critical application such as landslide prediction, fault tolerant approaches have to be followed, to ensure the availability of sensor data, at the analysis station, during a critical situation. In this circumstance, we analyze the preeminent modulation scheme, and transmission approach to improve bandwidth and energy efficiency in fault tolerant wireless sensor networks for land slide area monitoring. The total energy consumption includes both the transmission energy and the circuit energy consumption. The modulation schemes are compared based on their energy consumptions at their transceiver node. This paper analyzes the homogenous and heterogeneous modulation schemes to improve the energy efficiency and bandwidth efficiency in a wireless sensor network.
Wireless Healthcare Monitoring with RFID-Enhanced Video Sensor Networks  [PDF]
Hande Alemdar,Yunus Durmus,Cem Ersoy
International Journal of Distributed Sensor Networks , 2010, DOI: 10.1155/2010/473037
Abstract: In pervasive healthcare systems, WSNs provide rich contextual information and alerting mechanisms against odd conditions with continuous monitoring. Furthermore, they minimize the need for caregivers and help the chronically ill and elderly to survive an independent life. In this paper, we propose an outdoor monitoring environment and evaluate the capabilities of video sensor networks for healthcare monitoring in an outdoor setting. The results exhibit that their capabilities are limited. For this reason, we proposed several enhancements for reducing the traffic load on the network for better performance. RFID is a very mature technology that has already been used in many areas. The RFID-enhanced video sensor networks reduce the network traffic load. Moreover, the proximity of the healthcare professionals who are also moving in the surveillance area is also used for better balancing the network load. Finally, for assuring the reporting of the emergency events with low latencies, we propose an emergency frame based queuing mechanism and evaluated its performance through simulations. 1. Introduction One of the major challenges of the world for the last decades has been the continuous elderly population increase in the developed countries [1]. Hence, the need of delivering quality care to a rapidly growing population of elderly while reducing the healthcare costs is an important issue [2]. Constant monitoring will increase early detection of emergency conditions and diseases for at-risk patients and also provide wide range of healthcare services for people with various degrees of cognitive and physical disabilities [3]. In-home pervasive networks may assist residents and their caregivers by providing continuous medical monitoring, memory enhancement, control of home appliances, medical data access, and emergency communication [4, 5]. While continuous in-house monitoring will pose many benefits on futuristic healthcare monitoring scenarios, there are cases where indoor monitoring is not sufficient. When the elderly who are susceptible to sudden falls or the patients recovering from an operation are considered, the continuous monitoring in indoor places will not be sufficient for surviving an independent life. They should be able to move around freely while being monitored. Wireless sensor networks can be the remedy in that case. With the advances in Complementary Metal Oxide Semiconductor (CMOS) cameras and availability of low-cost hardware have led to the emergence of Video Sensor Networks (VSNs). These camera-equipped sensors are capable of generating and
Wearable and Implantable Wireless Sensor Network Solutions for Healthcare Monitoring  [PDF]
Ashraf Darwish,Aboul Ella Hassanien
Sensors , 2011, DOI: 10.3390/s110605561
Abstract: Wireless sensor network (WSN) technologies are considered one of the key research areas in computer science and the healthcare application industries for improving the quality of life. The purpose of this paper is to provide a snapshot of current developments and future direction of research on wearable and implantable body area network systems for continuous monitoring of patients. This paper explains the important role of body sensor networks in medicine to minimize the need for caregivers and help the chronically ill and elderly people live an independent life, besides providing people with quality care. The paper provides several examples of state of the art technology together with the design considerations like unobtrusiveness, scalability, energy efficiency, security and also provides a comprehensive analysis of the various benefits and drawbacks of these systems. Although offering significant benefits, the field of wearable and implantable body sensor networks still faces major challenges and open research problems which are investigated and covered, along with some proposed solutions, in this paper.
Wireless Health Data Exchange for Home Healthcare Monitoring Systems  [PDF]
Malrey Lee,Thomas M. Gatton
Sensors , 2010, DOI: 10.3390/s100403243
Abstract: Ubiquitous home healthcare systems have been playing an increasingly significant role in the treatment and management of chronic diseases, such as diabetes and hypertension, but progress has been hampered by the lack of standardization in the exchange of medical health care information. In an effort to establish standardization, this paper proposes a home healthcare monitoring system data exchange scheme between the HL7 standard and the IEEE1451 standard. IEEE1451 is a standard for special sensor networks, such as industrial control and smart homes, and defines a suite of interfaces that communicate among heterogeneous networks. HL7 is the standard for medical information exchange among medical organizations and medical personnel. While it provides a flexible data exchange in health care domains, it does not provide for data exchange with sensors. Thus, it is necessary to develop a data exchange schema to convert data between the HL7 and the IEEE1451 standard. This paper proposes a schema that can exchange data between HL7 devices and the monitoring device, and conforms to the IEEE 1451 standard. The experimental results and conclusions of this approach are presented and show the feasibility of the proposed exchange schema.
Performance Analysis of IEEE 802.15.4 Compliant Wireless Devices for Heterogeneous Indoor Home Automation Environments  [PDF]
Juan Antonio Nazabal,Peio López Iturri,Leire Azpilicueta,Francisco Falcone,Carlos Fernández-Valdivielso
International Journal of Antennas and Propagation , 2012, DOI: 10.1155/2012/176383
Abstract: The influence of topology as well as morphology of complex indoor scenarios in the deployment of wireless sensor networks and wireless systems applied to home and building automation systems is analyzed. The existence of loss mechanisms such as material absorption (walls, furniture, etc.) and strong multipath components as well as the increase in the number of wireless sensors within indoor scenarios increases the relevance in the configuration of the heterogeneous wireless systems. Simulation results by means of empirical-based models are compared with an in-house 3D ray launching code as well as measurement results from wireless sensor networks illustrate the strong influence of the indoor scenario in the overall performance. The use of adequate radioplanning strategies lead to optimal wireless network deployments in terms of capacity, quality of service, and reduced power consumption. 1. Introduction The use of wireless sensor networks (WSNs) is growing rapidly into a large number of fields of application [1–3], such as building automation systems (BAS), industrial monitoring [4, 5], farming and agriculture [6–9], structural monitoring [10], civil infrastructure state monitoring [11–13], healthcare monitoring [14, 15], location and guiding [16], or security and defense, among others. The future trend is to increase the number of nodes, in order to increase the interaction with users as well as capturing more information from the surrounding environment. On the other hand, the use of building automation systems, especially oriented to home automation, is growing all over the world [17–22]. As time goes by more homes integrate an automation system for intelligently controlling elements such light, heating, and energy management. The connection between the components of these systems has been made typically via electric conducting cables but nowadays the use of wireless technologies for communication with each other is taking a predominant role. In the case of home and building automation systems, the foreseen scenario is indoor, with high complexity related to the topology as well as the morphology. This leads to increased losses, in terms of material absorption as well as to strong multipath propagation. Future systems will tend to use a large number of sensors, in which energy consumption as well as capacity are key issues to be considered. The application of Building Automation systems to residential environments is also called Smart Home systems. In this way, a Smart Home can be defined as the application of automation and integration systems of
Enabling Roaming in Heterogeneous Multi-Operator Wireless Networks  [cached]
Oscar Salazar Gaitán,Philippe Martins,Jacques Demerjian,Samir Tohmé
Journal of Communications , 2007, DOI: 10.4304/jcm.2.4.18-28
Abstract: Next generation wireless networks will take advantage of the popularity and the data rates offered byunlicensed wireless networks to enhance cellular services. Nowadays, it is not surprising to see heterogeneous wireless networks coexisting on a daily basis i.e. UMTS, WiFi, and WiMAX. Unfortunately, technical issues and the lack of roaming agreements between network operators prevent interoperability. One of the goals of next generation wireless networks is to enable service mobility between heterogeneous wireless networks, thus we present in this article a SIP-based roaming architecture to enable service mobility in heterogeneous multi-operator wireless networks. Our objective is to establish mutual trust between cellular network operators and unlicensed wireless networks through a efficient SLA monitoring and enforcement and brokerbased access control. All this, with minimal changes in current wireless network architectures.
Wireless Body Area Networks for Healthcare: A Survey
Garth V. Crosby,Tirthankar Ghosh,Renita Murimi,Craig A. Chin
International Journal of Ad Hoc, Sensor & Ubiquitous Computing , 2012,
Abstract: Wireless body area networks (WBANs) are emerging as important networks, applicable in various fields. This paper surveys the WBANs that are designed for applications in healthcare. We present a comprehensive survey consisting of stand-alone sections focusing on important aspects of WBANs. We examine the following: monitoring and sensing, power efficient protocols, system architectures, routing and security. We conclude by discussing some open research issues, their potential solutions and future trends.
Ubiquitous HealthCare in Wireless Body Area Networks  [PDF]
N. A. Khan,N. Javaid,Z. A. Khan,M. Jaffar,U. Rafiq,A. Bibi
Computer Science , 2012,
Abstract: Recent advances in wireless communications, system on chip and low power sensor nodes allow realization of Wireless Body Area Networks (WBANs).WBANs comprise of tiny sensors, which collect information of a patient's vital signs and provide a real time feedback. In addition,WBANs also support many applications including ubiquitous healthcare, entertainment, gaming, military, etc. Ubiquitous healthcare is required by elderly people to facilitate them with instant monitoring anywhere they move around. In this paper, we provide a survey on different architectures used in WBANs for ubiquitous healthcare monitoring. Different standards and devices used in these architectures are also discussed in this paper. Finally, path loss in WBANs and its impact on communication is presented with the help of simulations performed for different models of In-Body communication and different factors (such as, attenuation, frequency, distance etc) influencing path loss in On-Body communications.
Metadata Challenge for Query Processing Over Heterogeneous Wireless Sensor Network  [PDF]
C. Komalavalli,Chetna Laroiya
Computer Science , 2011,
Abstract: Wireless sensor networks become integral part of our life. These networks can be used for monitoring the data in various domain due to their flexibility and functionality. Query processing and optimization in the WSN is a very challenging task because of their energy and memory constraint. In this paper, first our focus is to review the different approaches that have significant impacts on the development of query processing techniques for WSN. Finally, we aim to illustrate the existing approach in popular query processing engines with future research challenges in query optimization.
A Grid-Based Framework for Pervasive Healthcare Using Wireless Sensor Networks: A Case for Developing Nations
J.O. Daramola,V.C. Osamor,O.O. Oluwagbemi
Asian Journal of Information Technology , 2012,
Abstract: The advent of new emerging technologies such as ubiquitous mobile computing, telemedicine, Internet, grid computing, embedded systems and wireless sensor networks (WSN) offers great potentials to radically alter the existing modes of healthcare administration and delivery in developing nation. The phenomenon of standalone hospitals and a healthcare service delivery paradigm that always require a physical one-on-one contact between the patient and the medical expert even for cases of simple diagnosis, needs to be radically altered. In this study, we present the design of a national healthcare grid infrastructure, based on a novel integration of wireless sensor networks and wireless grid computing, for the purpose of inter-hospital collaboration and pervasive real-time monitoring of healthcare patients. This holds the promise of improving the nature of healthcare delivery services in developing nations.
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