Xem 1-20 trên 28 kết quả Sensor deployment
  • Wireless Sensor Networks hold the promise of delivering a smart communication paradigm which enables setting up an intelligent network capable of handling applications that evolve from user requirements. With the recent technological advances of wireless sensor network, it is becoming an integral part of our lives. However, due to the nature of wireless sensor networks, researchers face new challenges related to the design of algorithms and protocols.

    pdf320p greengrass304 18-09-2012 57 18   Download

  • IPS-1 is an intrusion prevention system (IPS) that delivers protection from a wide-range of network threats using an IPS-1 Sensor that can be placed either on the perimeter of your network or at any location in your internal network. Some of the benefits of IPS-1 include: Unified security management Mission-critical protection against known and unknown attacks Granular forensic analysis Flexible deployment Confidence Indexing

    pdf15p hoangtumayman 20-08-2012 26 1   Download

  • This is a timely, readable and comprehensive survey of recent work in the area of mobile networks, providing a good background reader for students and practitioners alike. It highlights some of the opportunities and challenges that accompany the deployment of both current wireless LANs as well as next-generation mesh and multihop networks.

    pdf40p thachsaudoi 22-12-2009 84 31   Download

  • Insider attacks pose an often neglected threat scenario when devising security mechanisms for emerging wireless technologies. For example, traffic safety applications in vehicular networks aim to prevent fatal collisions and preemptively warn drivers of hazards along their path, thus preserving numerous lives. Unmitigated attacks upon these networks stand to severely jeopardize their adoption and limit the scope of their deployment.

    pdf158p ptng13 16-05-2012 96 31   Download

  • Wireless Sensor Networks came into prominence around the start of this millennium motivated by the omnipresent scenario of small-sized sensors with limited power deployed in large numbers over an area to monitor different phenomenon. The sole motivation of a large portion of research efforts has been to maximize the lifetime of the network, where network lifetime is typically measured from the instant of deployment to the point when one of the nodes has expended its limited power source and becomes in-operational – commonly referred as first node failure....

    pdf0p 123859674 04-07-2012 75 8   Download

  • For the past decade, there has been rapid development and advancement in the communication and sensor technologies that results in the growth of a new, attractive and challenging research area – the wireless sensor network (WSN). A WSN, which typically consists of a large number of wireless sensor nodes formed in a network fashion, is deployed in environmental fields to serve various sensing and actuating applications.

    pdf0p 123859674 04-07-2012 33 6   Download

  • A WSN is composed of a large number of sensor nodes that are communicating using a wireless medium. The sensor nodes are deployed in the environment to be monitored in ad hoc structure. In WSN, there is sink node that collects data from all sensors, and usually not all nodes hear all other nodes. WSN is considered a multi-hop network.

    pdf0p 123859674 04-07-2012 48 6   Download

  • Wireless sensor networks promise an unprecedented fine-grained interface between the virtual and physical worlds. They are one of the most rapidly developing new information technologies, with applications in a wide range of fields including industrial process control, security and surveillance, environmental sensing, and structural health monitoring. This book is motivated by the urgent need to provide a comprehensive and organized survey of the field.

    pdf215p taurus23 02-08-2012 36 6   Download

  • Manufacturing companies deploy sensors in their products to return a stream of telemetry. Sometimes this is used to deliver services like OnStar, that delivers communications, security and navigation services. Perhaps more importantly, this telemetry also reveals usage patterns, failure rates and other opportunities for product improvement that can reduce development and assembly costs. The proliferation of smart phones and other GPS devices offers advertisers an opportunity to target consumers when they are in close proximity to a store, a coffee shop or a restaurant.

    pdf6p yasuyidol 02-04-2013 23 6   Download

  • Making the Nation Safer: The Role of Science and Technology in Countering Terrorism, a report released by the National Academies in June 2002,1 articulated the role of science and technology in countering terrorism. That report included material on the specific role of information technology (IT). Building on that report as a point of departure, the panel of experts responsible for the IT material in Making the Nation Safer was reconvened as the Committee on the Role of Information Technology in Responding to Terrorism in order to develop the present report....

    pdf146p camnhung_1 14-12-2012 22 4   Download

  • Regioregular polythiophene-based conductive copolymers with highly crystalline nanostructures are shown to hold considerable promise as the active layer in volatile organic compound (VOC) chemresistor sensors. While the regioregular polythiophene polymer chain provides a charge conduction path, its chemical sensing selectivity and sensitivity can be altered either by incorporating a second polymer to form a block copolymer or by making a random copolymer of polythiophene with different alkyl side chains.

    pdf14p cao_can 02-01-2013 24 3   Download

  • VSP techniques provide information in the vicinity of the borehole. VSP is a class of seismic measurements that can obtain high resolution images near the wellbore (Hardage, 2000). VSP acquisition utilizes sensors deployed within a borehole and sources located at the surface, whereas crosswell tomography uses sources and receivers both deployed in boreholes. The advantage of VSP, crosswell seismic, and other high resolution methods is to obtain more precise estimations of the CO2 induced effects on seismic properties.

    pdf63p bin_pham 06-02-2013 12 3   Download

  • Another use of mobility comes about if the specific area of interest (within a larger area) is unknown during deployment. For example, if a network is deployed to monitor the migration of a herd of animals, the herd’s exact path through an area will be unknown beforehand. But as the herd moves, the sensors could converge on it to get the maximum amount of data. In addition, the sensors could move such that they also maintain complete coverage of their environment while reacting to the events in that environment.

    pdf9p giamdocamnhac 06-04-2013 16 3   Download

  • In addition to this exhaustive analysis, an estimation tool it has been built, since in most of the cases the performance of a network can only be known after deployment in a particular environment. If some problems are detected they will need to be solved in a second iteration. Therefore, an estimation tool was considered relevant for these situations in order to guide the network designer, and also for the selection of the furniture materials. In this work, we try to solve this problem by proposing a Computer-Aided Design (CAD) software tool for non-expert users.

    pdf34p can_thai 10-12-2012 27 2   Download

  • An organization must tell individuals why information about them is collected, how to contact the organization with inquiries or complaints, what types of third parties the information will be disclosed to, and the options and means the organization provides individuals to limit the use and disclosure of the information. Notice must be provided to individuals in clear language at the point when individuals are first asked to provide personal information or as soon thereafter as is practicable.

    pdf18p khongmuonnghe 04-01-2013 16 1   Download

  • The development and deployment of NEMS and MEMS are critical to the U.S. economy and society because nano- and microtechnologies will lead to major breakthroughs in information technology and computers, medicine and health, manufacturing and transportation, power and energy systems, and avionics and national security.

    pdf22p longmontran 14-01-2010 90 35   Download

  • Electrochemistry has been used extensively in the past three decades to determine the chemical composition of environmental samples from the water column, sediments, soils, biofilms, and microbial mats.

    pdf0p taurus23 26-09-2012 36 15   Download

  • Coverage: In WSN, each sensor node is given a glimpse of the environment. This follows are limited in range and accuracy (Figure 1), it can only include a limited physical area of environment. Therefore, coverage is also an important design parameter in WSNs. Each node receives a local view of its environment, limited by the scope and accuracy of it. the coverage of a large area composed by the union of a number of smaller insurance. Connectivity: Most of the high density of WSNs sensor, thus preventing the isolation of the nodes.

    pdf312p samsungwifi 03-04-2012 38 8   Download

  • The proliferation of low-power and ultralow-power electronics has enabled a rapid growth of autonomous devices that ranges from consumer electronics and nomad devices to autonomous sensors and sensor networks used in industrial and military environments. Hence, a wide range of application domains has been impacted by such technologies (aeronautic, civil engineering,biomedical engineering, home automation, etc.).

    pdf356p namde01 11-04-2013 22 5   Download

  • In a variety of scenarios, often the only way to fully observe or monitor a situation is through the use of sensors. Sensors have been used in both civil and military applications, in order to extend the field of view of the end-user. However, most current sensing systems consist of a few large macrosensors, which while being highly accurate are expensive. Macrosensor systems are highly sensitive; the entire system can break down even with one faulty sensor.

    pdf28p tienvovan 16-09-2010 55 4   Download

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