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Sample records for application society ieee

  1. Proceedings of the Organization of 1990 Meeting of International Neural Network Society Jointed with IEEE Held in Washington, DC on January 15 - 19, 1990. Volume 2. Applications Track.

    Science.gov (United States)

    1990-11-30

    on probl em, Further work musti be done to adapt the network to handle non-homogeneous background, I1- 317 RA- £ exren c es 11 R. Nitz berg ... Luscher prognosis to in- clude more modem philosophical approaches. Finally, the specific equipment needed would be a Macintosh6 with a color display... LUSCHER APPLICATION The Macintosh software development has resulted in a reasonably small application, under 75K bytes in size. The Macintosh

  2. Delay Analysis of GTS Bridging between IEEE 802.15.4 and IEEE 802.11 Networks for Healthcare Applications.

    Science.gov (United States)

    Misić, Jelena; Sherman Shen, Xuemin

    2009-01-01

    We consider interconnection of IEEE 802.15.4 beacon-enabled network cluster with IEEE 802.11b network. This scenario is important in healthcare applications where IEEE 802.15.4 nodes comprise patient's body area network (BAN) and are involved in sensing some health-related data. BAN nodes have very short communication range in order to avoid harming patient's health and save energy. Sensed data needs to be transmitted to an access point in the ward room using wireless technology with higher transmission range and rate such as IEEE 802.11b. We model the interconnected network where IEEE 802.15.4-based BAN operates in guaranteed time slot (GTS) mode, and IEEE 802.11b part of the bridge conveys GTS superframe to the 802.11b access point. We then analyze the network delays. Performance analysis is performed using EKG traffic from continuous telemetry, and we discuss the delays of communication due the increasing number of patients.

  3. New IEEE standard enables data collection for medical applications.

    Science.gov (United States)

    Kennelly, R J; Wittenber, J

    1994-01-01

    The IEEE has gone to ballot on a "Standard for Medical Device Communications", IEEE P1073. The lower layer, hardware portions of the standard are expected to be approved by the IEEE Standards Board at their December 11-13, 1994 meeting. Other portions of the standard are in the initial stages of the IEEE ballot process. The intent of the standard is to allow hospitals and other users to interface medical electronic devices to host computer systems in a standard, interchangeable manner. The standard is optimized for acute care environments such as ICU's, operating rooms, and emergency rooms. [1] IEEE General Committee and Subcommittee work has been on-going since 1984. Significant amounts of work have been done to discover and meet the needs of the patient care setting. Surveys performed in 1989 identified the following four key user requirements for medical device communications: 1) Frequent reconfiguration of the network. 2) Allow "plug and play" operation by users. 3) Associate devices with a specific bed and patient. 4) Support a wide range of hospital computer system topologies. Additionally, the most critical difference in the acute care setting is patient safety, which has an overall effect on the standard. The standard that went to ballot meets these requirements. The standard is based on existing ISO standards. P1073 is compliant with the OSI seven layer model. P1073 specifies the entire communication stack, from object-oriented software to hospital unique connectors. The standard will be able to be put forward as a true international standard, much in the way that the IEEE 802.x family of standards (like Ethernet) were presented as draft ISO standards.(ABSTRACT TRUNCATED AT 250 WORDS)

  4. Energy Harvesting - Wireless Sensor Networks for Indoors Applications Using IEEE 802.11

    DEFF Research Database (Denmark)

    Fafoutis, Xenofon; Sørensen, Thomas; Madsen, Jan

    2014-01-01

    The paper investigates the feasibility of using IEEE 802.11 in energy harvesting low-power sensing applications. The investigation is based on a prototype carbon dioxide sensor node that is powered by artificial indoors light. The wireless communication module of the sensor node is based on the RTX......4100 module. RTX4100 incorporates a wireless protocol that duty-cycles the radio while being compatible with IEEE 802.11 access points. The presented experiments demonstrate sustainable operation but indicate a trade-off between the benefits of using IEEE 802.11 in energy harvesting applications...

  5. Application of IEEE 1588 in LXI testing system%LXI测试系统中IEEE 1588的应用

    Institute of Scientific and Technical Information of China (English)

    Bob Rennard; Agilent Technologies

    2009-01-01

    LXI联盟是主要测试和测量厂商的一个组织,负责开拓基于LAN通信和融合IEEE 1588的模块化、分布式的仪器体系结构.本文将概要说明与 IEEE 1588相关的LXI规范,以及如何在基于LXI测试和测最系统中用IEEE 1588建立时基.

  6. Test-Driven Development of IEEE 1451 Transducer Services and Application

    Directory of Open Access Journals (Sweden)

    S. Ranđić

    2012-06-01

    Full Text Available IEEE 1451 standard defines the methods of integrating smart transducers into communicating networks. Interface between a user application and a field of transducers, known as Transducer Services API is defined by standrad IEEE 1451.0. This paper presents the use of Test- Driven Design (TDD in developing methods for accessing transducer services using Transducer Services API and developing web applications which access this services over the network. The characteristics of TDD and its benefits are presented and the way of realization for one method is shown using Java and JUnit framework to run tests.

  7. Improving IEEE 802.15.4 for Low-Latency Energy-Efficient Industrial Applications

    Science.gov (United States)

    Chen, Feng

    The IEEE 802.15.4 standard for LR-WPAXs is becoming a de-facto standard for Wireless Sensor Xetworks (WSXs) applications in industrial fields. In this paper, we evaluate the latency performance of the IEEE 802.15.4 protocol based on a typical industrial scenario: a star network with 20 devices that send short messages (1 Byte) to the PAX coordinator. We analyzed the behavior of the GTS mechanism in the standard analytically. The results reveal essential limitations of the standard for low-latency applications in automation environments. According to our findings, we propose an enhanced protocol version that fully supports industry demands on low-latency communication. Our protocol version uses the original physical layer and, thus, can be implemented conveniently using cheap IEEE 802.15.4 hardware. The analytical results prove that we are able to meet the guaranteed low latency of 10 ms as specified by typical automation environments.

  8. The scalable coherent interface, IEEE P1596, status and possible applications to data acquisition and physics

    Energy Technology Data Exchange (ETDEWEB)

    Gustavson, D.B.

    1990-01-01

    IEEE P1596, the Scalable Coherent Interface (formerly known as SuperBus) is based on experience gained while developing Fastbus (ANSI/IEEE 960-1986, IEC 935), Futurebus (IEEE P896.x) and other modern 32-bit buses. SCI goals include a minimum bandwidth of 1 GByte/sec per processor in multiprocessor systems with thousands of processors; efficient support of a coherent distributed-cache image of distributed shared memory; support for repeaters which interface to existing or future buses; and support for inexpensive small rings as well as for general switched interconnections like Banyan, Omega, or crossbar networks. This paper presents a summary of current directions, reports the status of the work in progress, and suggests some applications in data acquisition and physics. 7 refs.

  9. Channel Resource Allocation for VoIP Applications in Collaborative IEEE 802.11/802.16 Networks

    Directory of Open Access Journals (Sweden)

    Foh ChuanHeng

    2010-01-01

    Full Text Available Collaborations between the IEEE 802.11 and the IEEE 802.16 networks operating in a common spectrum offers dynamic allocate bandwidth resources to achieve improved performance for network applications. This paper studies the bandwidth resource allocation of collaborative IEEE 802.11 and IEEE 802.16 networks. Consider delivering data packets between mobile stations and Internet users through an access point (AP of the IEEE 802.11 network and a base station (BS of the IEEE 802.16 network operating on a common frequency band, we analyze their medium access control (MAC protocols, frame structures, and design a cooperation mechanism for the IEEE 802.11 and the IEEE 802.16 networks to share the same medium with adaptive resource allocation. Based on the mechanism, an optimized resource allocation scheme is proposed for VoIP applications. An analytical model is developed for the study to show significant improvements in voice capacity for our optimized resource allocation scheme.

  10. Investigating the efficiency of IEEE 802.15.4 for medical monitoring applications.

    Science.gov (United States)

    Pelegris, P; Banitsas, K

    2011-01-01

    Recent advancements in wireless communications technologies bring us one step closer to provide reliable Telecare services as an alternative to patients staying in a hospital mainly for monitoring purposes. In this research we investigate the efficiency of IEEE 802.15.4 in a simple scenario where a patient is being monitored using an ECG and a blood analysis module. This approach binds well with assisted living solutions, by sharing the network infrastructure for both monitoring and control while taking advantage of the low power features of the protocol. Such applications are becoming more and more realistic to implement as IEEE 802.15.4 compatible hardware becomes increasingly available. Our aim is to examine the impact of Beacon and Superframe Order in the medium access delay, dropped packets, end to end delay, average retransmission attempts and consumed power focusing on this bandwidth demanding situation where the network load does not allow low duty cycles, in order to draw some conclusions on the effect that this will have to telemonitoring applications.

  11. Integration of heterogeneous biomedical sensors into an ISO/IEEE 11073 compliant application.

    Science.gov (United States)

    Fioravanti, A; Fico, G; Arredondo, M T; Salvi, D; Villalar, J L

    2010-01-01

    Current trends in healthcare technology include mobile-based applications. Relevant advances in the integration of vital signs monitoring devices with mobile platforms are widely reported nowadays. In this context, conceiving and designing an interoperable application is essential due to the growing necessity of integrating a huge and heterogeneous amount of biomedical data, coming from a wide range of devices and sensors. In this paper the key research issues associated with such integration are presented as well as a specific proposal to solve these problems. It is based on a middleware architecture for the integration of biomedical sensors with mobile devices, derived from the ISO/IEEE 11073 standards family. The application has been developed in the framework of an EU-funded R&D project called METABO.

  12. IEEE/NASA Workshop on Leveraging Applications of Formal Methods, Verification, and Validation

    Science.gov (United States)

    Margaria, Tiziana (Editor); Steffen, Bernhard (Editor); Hichey, Michael G.

    2005-01-01

    This volume contains the Preliminary Proceedings of the 2005 IEEE ISoLA Workshop on Leveraging Applications of Formal Methods, Verification, and Validation, with a special track on the theme of Formal Methods in Human and Robotic Space Exploration. The workshop was held on 23-24 September 2005 at the Loyola College Graduate Center, Columbia, MD, USA. The idea behind the Workshop arose from the experience and feedback of ISoLA 2004, the 1st International Symposium on Leveraging Applications of Formal Methods held in Paphos (Cyprus) last October-November. ISoLA 2004 served the need of providing a forum for developers, users, and researchers to discuss issues related to the adoption and use of rigorous tools and methods for the specification, analysis, verification, certification, construction, test, and maintenance of systems from the point of view of their different application domains.

  13. Application Delay Modelling for Variable Length Packets in Single Cell IEEE 802.11 WLANs

    CERN Document Server

    Sunny, Albert; Aggarwal, Saurabh

    2010-01-01

    In this paper, we consider the problem of modelling the average delay experienced by an application packets of variable length in a single cell IEEE 802.11 DCF wireless local area network. The packet arrival process at each node i is assumed to be a stationary and independent increment random process with mean ai and second moment a(2) i . The packet lengths at node i are assumed to be i.i.d random variables Pi with finite mean and second moment. A closed form expression has been derived for the same. We assume the input arrival process across queues to be uncorrelated Poison processes. As the nodes share a single channel, they have to contend with one another for a successful transmission. The mean delay for a packet has been approximated by modelling the system as a 1-limited Random Polling system with zero switchover times. Extensive simulations are conducted to verify the analytical results.

  14. Research on IEEE 802.22.1 Beacon Networks Application%IEEE 802.22.1信标网络应用研究

    Institute of Scientific and Technical Information of China (English)

    杨大全

    2012-01-01

    Several IEEE 802.22.1 beacon devices are used to build beacon network by self-organization. IEEE 802.22.1 beacon protocol is introduced, and the decision strategies of beacon networks in the process of establishing and maintenance are discussed. IEEE 802.22.1 beacon networks sensing and information detection in WRAN device are introduced. The maximum latency before scheduling a quiet period that will ensure to capture the full information of the beacon network is given.%多个IEEE 802.22.1信标设备将自组织成信标网络.介绍了IEEE 802.22.1标准中定义的自组织方案;讨论了信标网络建立与维持过程中的判决策略;介绍了无线区域网络(WRAN)设备对IEEE 802.22.1信标网络的识别与信息获取机制;给出了确保实现对信标网络信息解析所需要安排的最大时延.

  15. A Novel Current-Mode Differential Transconductance LNA for IEEE 802.11a Application

    Science.gov (United States)

    Tu, Yuxiang; Wang, Chunhua; Chen, Lei; Wu, Zhangbin; Zhang, Guangxiang

    2012-03-01

    In this paper, a novel current-mode differential transconductance low noise amplifier (LNA) designed in the chartered 0.18 μm CMOS technology is proposed to realize the receiver front-end. The proposed LNA frequency ranges from 4.7 GHz to 6 GHz,mainly targeting at IEEE802.11a application. It utilizes two stage structure, with a PMOS current-mirrorr using inductive series peaking technique to achieve optimized current output. The noise performance is improved through the use of a gm-boosting technique, while the gain performance is improved and power consumption is saved by using current-reused technique. Measured results demonstrate that the circuit provides flat transconductance gain higher than 17.0 dB, noise figure lower than 2.31 dB and low operating voltage of 0.85 V in frequency band. A comparison with other LNAs in similar and nearby frequency bands shows the proposed LNA has advantages of higher gain, lower noise figure and better other performances.

  16. Application and Simulation of OFDM in IEEE 802.16 Networks%正交频分复用技术在IEEE802.16标准中的应用及仿真分析

    Institute of Scientific and Technical Information of China (English)

    马辉; 王兴; 王军

    2012-01-01

    文章介绍了正交频分复用技术在802.16中的应用及802.16的帧结构,并在NS2中对IEEE802.16进行了仿真,接着分析了实验结果,最后提出了下一步研究方向。%This paper introduces the application of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802. 16. The frame structure of IEEE 802. 16 PMP was also discussed in the paper. Then the 802. 16 was evaluated using NS2 and the result was analyzed. Fi- nally, the future work was put forward.

  17. Proceedings of the IEEE Machine Learning for Signal Processing XVII

    DEFF Research Database (Denmark)

    The seventeenth of a series of workshops sponsored by the IEEE Signal Processing Society and organized by the Machine Learning for Signal Processing Technical Committee (MLSP-TC). The field of machine learning has matured considerably in both methodology and real-world application domains and has...

  18. An Adaptive Medium Access Parameter Prediction Scheme for IEEE 802.11 Real-Time Applications

    Directory of Open Access Journals (Sweden)

    Estefanía Coronado

    2017-01-01

    Full Text Available Multimedia communications have experienced an unprecedented growth due mainly to the increase in the content quality and the emergence of smart devices. The demand for these contents is tending towards wireless technologies. However, these transmissions are quite sensitive to network delays. Therefore, ensuring an optimum QoS level becomes of great importance. The IEEE 802.11e amendment was released to address the lack of QoS capabilities in the original IEEE 802.11 standard. Accordingly, the Enhanced Distributed Channel Access (EDCA function was introduced, allowing it to differentiate traffic streams through a group of Medium Access Control (MAC parameters. Although EDCA recommends a default configuration for these parameters, it has been proved that it is not optimum in many scenarios. In this work a dynamic prediction scheme for these parameters is presented. This approach ensures an appropriate traffic differentiation while maintaining compatibility with the stations without QoS support. As the APs are the only devices that use this algorithm, no changes are required to current network cards. The results show improvements in both voice and video transmissions, as well as in the QoS level of the network that the proposal achieves with regard to EDCA.

  19. Cross-Layer Measurement on an IEEE 802.11g Wireless Network Supporting MPEG-2 Video Streaming Applications in the Presence of Interference

    Directory of Open Access Journals (Sweden)

    Alessandro Sona

    2010-01-01

    Full Text Available The performance of wireless local area networks supporting video streaming applications, based on MPEG-2 video codec, in the presence of interference is here dealt with. IEEE 802.11g standard wireless networks, that do not support QoS in according with IEEE 802.11e standard, are, in particular, accounted for and Bluetooth signals, additive white Gaussian noise, and competitive data traffic are considered as sources of interference. The goal is twofold: from one side, experimentally assessing and correlating the values that some performance metrics assume at the same time at different layers of an IEEE 802.11g WLAN delivering video streaming in the presence of in-channel interference; from the other side, deducing helpful and practical hints for designers and technicians, in order to efficiently assess and enhance the performance of an IEEE 802.11g WLAN supporting video streaming in some suitable setup conditions and in the presence of interference. To this purpose, an experimental analysis is planned following a cross-layer measurement approach, and a proper testbed within a semianechoic chamber is used. Valuable results are obtained in terms of signal-to-interference ratio, packet loss ratio, jitter, video quality, and interference data rate; helpful hints for designers and technicians are finally gained.

  20. Implementation of a wireless ECG acquisition SoC for IEEE 802.15.4 (ZigBee) applications.

    Science.gov (United States)

    Wang, Liang-Hung; Chen, Tsung-Yen; Lin, Kuang-Hao; Fang, Qiang; Lee, Shuenn-Yuh

    2015-01-01

    This paper presents a wireless biosignal acquisition system-on-a-chip (WBSA-SoC) specialized for electrocardiogram (ECG) monitoring. The proposed system consists of three subsystems, namely, 1) the ECG acquisition node, 2) the protocol for standard IEEE 802.15.4 ZigBee system, and 3) the RF transmitter circuits. The ZigBee protocol is adopted for wireless communication to achieve high integration, applicability, and portability. A fully integrated CMOS RF front end containing a quadrature voltage-controlled oscillator and a 2.4-GHz low-IF (i.e., zero-IF) transmitter is employed to transmit ECG signals through wireless communication. The low-power WBSA-SoC is implemented by the TSMC 0.18-μm standard CMOS process. An ARM-based displayer with FPGA demodulation and an RF receiver with analog-to-digital mixed-mode circuits are constructed as verification platform to demonstrate the wireless ECG acquisition system. Measurement results on the human body show that the proposed SoC can effectively acquire ECG signals.

  1. Proceedings of the 9th IEEE International Symposium on Applications of Ferroelectrics

    Science.gov (United States)

    Pandey, R. K.; Liu, Michael; Safari, Ahmad

    1994-08-01

    The Ninth International Symposium on the Applications of Ferroelectrics (ISAF '94) was held at the Penn State Scanticon Conference Center, the Pennsylvania State University, University Park, Pennsylvania, during August 7-10, 1994. The Symposium program contained 377 scientific papers on various aspects of ferroelectrics and their applications. There were 116 oral (42 invited) and 261 poster papers presented in three parallel oral sessions and in the poster sessions each day over the three days of the meeting. The meeting covered major advances in the areas of piezoelectrics, dielectrics, thin film ferroelectrics, actuators, smart materials, pyroelectrics, nonlinear optical ferroelectrics, photorefractive materials, and their applications. The conference was attended by international scientists representing 21 countries. The geographical distribution of the papers, international and national, is represented in the accompanying table and graphs.

  2. Practical Applications of Cosmology to Human Society

    CERN Document Server

    Chaisson, Eric J

    2014-01-01

    Complex systems throughout Nature display structures and functions that are built and maintained, at least in part, by optimal energies flowing through them--not specific, ideal values, rather ranges in energy rate density below which systems are starved and above which systems are destroyed. Cosmic evolution, as a physical cosmology that notably includes life, is rich in empirical findings about many varied systems that can potentially help assess global problems facing us here on Earth. Despite its grand and ambitious objective to unify theoretical understanding of all known complex systems from big bang to humankind, cosmic evolution does have useful, practical applications from which humanity could benefit. Cosmic evolution's emphasis on quantitative data analyses might well inform our attitudes toward several serious issues now challenging 21st-century society, including global warming, smart machines, world economics, and cancer research. This paper comprises one physicist's conjectures about each of th...

  3. International Conference on Grey Systems and intelligent Services (IEEE GSIS 2009)

    CERN Document Server

    Liu, Sifeng; Advances in Grey Systems Research

    2010-01-01

    This book contains contributions by some of the leading researchers in the area of grey systems theory and applications. All the papers included in this volume are selected from the contributions physically presented at the 2009 IEEE International Conference on Grey Systems and Intelligent Services, November 11 – 12, 2009, Nanjing, Jiangsu, People’s Republic of China. This event was jointly sponsored by IEEE Systems, Man, and Cybernetics Society, Natural Science Foundation of China, and Grey Systems Society of China. Additionally, Nanjing University of Aeronautics and Astronautics also invested heavily in this event with its direct and indirect financial and administrative supports.

  4. The IEEE-1394 Digital Camera Application in the Taiwan Light Source

    CERN Document Server

    Kuo, Changhor; Wang, Min-Huey

    2005-01-01

    The CCD camera with digital interface has been adopted for the diagnostics purpose recently. The long distance transmission with digital interface eliminates image distortion. Without frame grabber in the computer that is also another benefit. These applications include screen monitor and optical transition radiation monitor image for injection study, synchrotron radiation monitor of the booster synchrotron and storage ring. An intensified gated CCD camera is also applied for transient profile study. Wider dynamic range and the flexibility of the newly camera provide various functional enhancements for the diagnostics purpose. The effort and achievement will be summary in this report.

  5. Risk Management Supplement to IEEE-15288.1

    Science.gov (United States)

    2015-05-15

    AND MISSILE SYSTEMS CENTER TAILORING RISK MANAGEMENT SUPPLEMENT TO IEEE -15288.1 APPROVED FOR PUBLIC RELEASE...IEC- IEEE -15288: 2015, SYSTEMS AND SOFTWARE ENGINEERING — SYSTEM LIFE CYCLE PROCESSES...1 2.2. IEEE -15288.1: 2015, STANDARD FOR APPLICATION OF SYSTEMS ENGINEERING ON DEFENSE PROGRAMS

  6. The IEEE Milestone event at CERN

    CERN Multimedia

    2005-01-01

    On the initiative of its French and Swiss Sections, the IEEE has honoured CERN with an 'IEEE Milestone in the history of electricity and electronics' for the invention of the multi-wire proportional chamber in 1968. The IEEE established the Electrical Engineering Milestones programe in 1983 to honour significant achievements in the history of electrical and electronics engineering. To be designated, an achievement must be at least 25 years old, must have involved a unique solution to an engineering problem, and must have had at least regional impact. Currently there are more than  50 IEEE Milestones around the world. http://www.ieee.org/organizations/history_center/cern.html The installation and unveiling of this IEEE Milestone will provide the opportunity to emphasize the close relationship between science, technology, industry and well-being in society.  A ceremony, organised with the support of a group of IEEE members working at CERN, will be held at the CERN Globe of Science and Inn...

  7. IEEE 1451网络化智能传感器标准的发展及应用探讨%Study of Development and Application of IEEE 1451 Standards for Networked Smart Sensors

    Institute of Scientific and Technical Information of China (English)

    童利标; 徐科军; 梅涛

    2002-01-01

    IEEE 1451标准由IEEE 1451.1、1451.2、P1451.3和P1451.4组成.它定义了一套连接传感器到网络的标准化通用接口,建立了网络化智能传感器的框架,这使得传感器制造商有能力支持多种网络.然而,IEEE1451标准在应用中存在着一些困难.本文简要介绍IEEE 1451标准的内容和发展过程,分析限制该标准应用的一些原因,讨论IEEE1451.x标准之间的关系,给出一个用于机器人手爪的基于IEEE1451.1标准的网络化智能传感器的例子.

  8. IEEE 1588时间同步在ZigBee低功耗中的应用%Application of IEEE 1588 Time Synchronization in ZigBee Low Power Consumption Operation

    Institute of Scientific and Technical Information of China (English)

    邢伟伟; 白瑞林

    2012-01-01

    In order to realize the sleep and wake-up functions of the relay nodes in ZigBee wireless network, and to reduce the system power consumption, a new time synchronization algorithm is proposed. It uses interrupt signals of analog switch and RTC module to control the power supply for main control module, and to make routing equipment get into ultra-low power consumption operation state. Meanwhile, IEEE 1588 precision time protocol (PTP) is used to complete the clock synchronization of MAC layer, reduce the loss between layers of synchronization algorithms protocol, and solve the problem of low accuracy of traditional time synchronization algorithm. Tests show that synchronization accuracy of the improved synchronous algorithm reaches +50 u,s, and the system operation power consumption is extremely low. Relying on Lithium battery, the nodes can continuously work up to six months. The method also can monitor the low frequency data, and make the application of wireless network more flexible and wider.%在ZigBee无线网络中,为实现中继节点的休眠和唤醒功能,并达到降低系统功耗的目的,提出了一种新的时间同步算法.该算法利用模拟开关和RTC模块的中断信号控制主控模块的供电,使路由设备进入超低功耗运行状态;同时采用IEEE 1588的精确时钟同步协议PTP完成MAC层的时钟同步,减少了同步算法协议层间损耗,解决了传统时间同步算法精度不高的问题.试验表明,改进后同步算法的同步精度达到+ 50μs,系统运行功耗极低;节点仅靠锂电池即可持续工作半年以上,能够满足低频率数据监控等应用,使无线网络应用更加灵活、广泛.

  9. Research on standard profile for use of IEEE Std 1588-2008 precision time protocol in power system applications%IEEE Std 1588-2008精确时间同步协议行业规范在电力系统的应用研究

    Institute of Scientific and Technical Information of China (English)

    贺春; 陈光华; 张道农

    2015-01-01

    This paper provides a summary of the IEEE C37.238-2011 standard. Firstly, it introduces the relationship between the IEEE C37.238 standard and the IEEE1588 standard. Then, it introduces the difference on the parameter and mechanism, which are defined by C37.238 standard and the IEEE1588 standard. And it introduces the characteristic parameters of C37.238. At last, it analyzes the problems and corresponding solutions may be faced by PTP precision time protocol in future applying. It specifies a subset of PTP parameters and options to provide global time availability, device interoperability, and failure management. This set of PTP parameters and options allows IEEE 1588-based time synchronization to be used in mission critical power system protection, control, automation, and data communication applications utilizing Ethernet communications architecture.%对电力行业PTP规范文件IEEE C37.238-2011标准进行总结和分析。首先介绍电力行业PTP规范与IEEE1588标准的关系,然后介绍电力行业PTP规范定义的参数、机制等与IEEE1588标准的不同之处以及其特有的一些参数,最后分析PTP精确时间同步协议在以后应用中可能面临的问题及解决办法。电力行业PTP规范为了给外界提供全球可用时间、设备互操作和故障管理,在IEEE Std 1588-2008标准基础上规定了新的PTP参数子集和特权。新的PTP参数子集和特权使基于IEEE1588的时间同步机制可以通过以太网通信结构在电力系统关键领域得到有效应用,这些领域包括保护、控制、自动化和数据通信等。

  10. IEEE prize awarded to CERN PhD student

    CERN Multimedia

    2006-01-01

    Rafael Ballabriga Suñe (right) receives the Student Paper Award. Rafael Ballabriga Suñe is the recipient of the 2006 Institute of Electrical and Electronics Engineers, Inc. (IEEE) Nuclear and Plasma Sciences Society (NPSS)'s Student Paper Award. Ballabriga's winning paper reported on a prototype chip, which belongs to a new generation of single photon counting hybrid pixel detector readout chips - Medipix3. The NPSS established this award in 2005 to encourage outstanding student contributions and greater student participation as principle or sole authors of papers. The prizes were presented at the IEEE Nuclear Science Symposium held in San Diego on 29 October to 4 November. The prototype chip was designed by Ballabriga based on ideas generated within the CERN Medipix team - part of the PH Microelectronics group. It could be used in various fields in the future, including medical imaging, neutron imaging, electron microscopy, radiation monitoring and other applications in high-energy physics. The novel aspe...

  11. Application of IEEE 1588 protocol in protection example value synchronization of distributed generation system%IEEE 1588在分布式发电系统保护采样值同步中的应用

    Institute of Scientific and Technical Information of China (English)

    杨乘胜; 唐立军

    2009-01-01

    The future trend of the distributed automation system is adopting the 1EC 61850 standard to realize seamless communication in the substation and between the substation and every node of the distributed system. The IEC 61850 protocol has very high requirement for sample value synchronization accuracy. The IEEE 1588 protocol was introduced and analyzed. A separate iming index generator was established, and "side-clock" function for exchanger was realized. A new accurate time synchronization scheme was proposed which is in accordance with the IEEE 1588 protocol and can be used in distributed system protection communication, and the software and hardware structure modes were given. The realization of the IEEE 1588 protocol was accomplished by using microcontroller, and the requirement of sample value synchronization of distributed protection communication system based on IEC 61850 protocol should be satisfied.%分布式发电自动化系统未来的趋势是变电站以及变电站到分布式系统的每个节点之间都采用IEC 61850标准实现无缝通信.IEC 61850对采样值同步精确度有着非常高的精确性要求.分析并介绍了IEEE 1588协议.单独设立时标生成器,对交换机实现边界时钟功能.提出了一种符合IEEE 1588协议,可用于分布式系统保护通信中的精确时间同步新方案,并给出了软硬件结构模型.IEEE 1588协议的实现利用微控制器来完成,可以满足基于IEC 61850的分布式保护通信系统的采样值同步要求.

  12. IEEE International Workshop on Machine Learning for Signal Processing: Preface

    DEFF Research Database (Denmark)

    Tao, Jianhua

    The 21st IEEE International Workshop on Machine Learning for Signal Processing will be held in Beijing, China, on September 18–21, 2011. The workshop series is the major annual technical event of the IEEE Signal Processing Society's Technical Committee on Machine Learning for Signal Processing...

  13. IEEE International Workshop on Machine Learning for Signal Processing: Preface

    DEFF Research Database (Denmark)

    Tao, Jianhua

    The 21st IEEE International Workshop on Machine Learning for Signal Processing will be held in Beijing, China, on September 18–21, 2011. The workshop series is the major annual technical event of the IEEE Signal Processing Society's Technical Committee on Machine Learning for Signal Processing...

  14. IEEE International Symposium on Biomedical Imaging.

    Science.gov (United States)

    2017-01-01

    The IEEE International Symposium on Biomedical Imaging (ISBI) is a scientific conference dedicated to mathematical, algorithmic, and computational aspects of biological and biomedical imaging, across all scales of observation. It fosters knowledge transfer among different imaging communities and contributes to an integrative approach to biomedical imaging. ISBI is a joint initiative from the IEEE Signal Processing Society (SPS) and the IEEE Engineering in Medicine and Biology Society (EMBS). The 2018 meeting will include tutorials, and a scientific program composed of plenary talks, invited special sessions, challenges, as well as oral and poster presentations of peer-reviewed papers. High-quality papers are requested containing original contributions to the topics of interest including image formation and reconstruction, computational and statistical image processing and analysis, dynamic imaging, visualization, image quality assessment, and physical, biological, and statistical modeling. Accepted 4-page regular papers will be published in the symposium proceedings published by IEEE and included in IEEE Xplore. To encourage attendance by a broader audience of imaging scientists and offer additional presentation opportunities, ISBI 2018 will continue to have a second track featuring posters selected from 1-page abstract submissions without subsequent archival publication.

  15. Proceedings of IEEE Machine Learning for Signal Processing Workshop XVI

    DEFF Research Database (Denmark)

    Larsen, Jan

    These proceedings contains refereed papers presented at the sixteenth IEEE Workshop on Machine Learning for Signal Processing (MLSP'2006), held in Maynooth, Co. Kildare, Ireland, September 6-8, 2006. This is a continuation of the IEEE Workshops on Neural Networks for Signal Processing (NNSP...... with sponsorship of the IEEE Signal Processing Society. Following the practice started three years ago, the bound volume of the proceedings is going to be published by IEEE following the Workshop, and we are pleased to offer to conference attendees the proceeding in a CDROM electronic format, which maintains...

  16. Proceedings of IEEE Machine Learning for Signal Processing Workshop XVI

    DEFF Research Database (Denmark)

    Larsen, Jan

    These proceedings contains refereed papers presented at the sixteenth IEEE Workshop on Machine Learning for Signal Processing (MLSP'2006), held in Maynooth, Co. Kildare, Ireland, September 6-8, 2006. This is a continuation of the IEEE Workshops on Neural Networks for Signal Processing (NNSP...... with sponsorship of the IEEE Signal Processing Society. Following the practice started three years ago, the bound volume of the proceedings is going to be published by IEEE following the Workshop, and we are pleased to offer to conference attendees the proceeding in a CDROM electronic format, which maintains...

  17. Proceedings of IEEE Machine Learning for Signal Processing Workshop XV

    DEFF Research Database (Denmark)

    Larsen, Jan

    These proceedings contains refereed papers presented at the Fifteenth IEEE Workshop on Machine Learning for Signal Processing (MLSP’2005), held in Mystic, Connecticut, USA, September 28-30, 2005. This is a continuation of the IEEE Workshops on Neural Networks for Signal Processing (NNSP) organized...... by the NNSP Technical Committee of the IEEE Signal Processing Society. The name of the Technical Committee, hence of the Workshop, was changed to Machine Learning for Signal Processing in September 2003 to better reflect the areas represented by the Technical Committee. The conference is organized...... by the Machine Learning for Signal Processing Technical Committee with sponsorship of the IEEE Signal Processing Society. Following the practice started two years ago, the bound volume of the proceedings is going to be published by IEEE following the Workshop, and we are pleased to offer to conference attendees...

  18. Proceedings of IEEE Machine Learning for Signal Processing Workshop XV

    DEFF Research Database (Denmark)

    Larsen, Jan

    These proceedings contains refereed papers presented at the Fifteenth IEEE Workshop on Machine Learning for Signal Processing (MLSP’2005), held in Mystic, Connecticut, USA, September 28-30, 2005. This is a continuation of the IEEE Workshops on Neural Networks for Signal Processing (NNSP) organized...... by the NNSP Technical Committee of the IEEE Signal Processing Society. The name of the Technical Committee, hence of the Workshop, was changed to Machine Learning for Signal Processing in September 2003 to better reflect the areas represented by the Technical Committee. The conference is organized...... by the Machine Learning for Signal Processing Technical Committee with sponsorship of the IEEE Signal Processing Society. Following the practice started two years ago, the bound volume of the proceedings is going to be published by IEEE following the Workshop, and we are pleased to offer to conference attendees...

  19. Introduction to the IEEE International Symposium on Applications of Ferroelectrics and International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials.

    Science.gov (United States)

    Ye, Zuo-Guang; Tan, Xiaoli; Bokov, Alexei A

    2012-09-01

    The 20th IEEE International Symposium on Applications of Ferroelectrics (ISAF) was held on July 24-27, 2011, in Vancouver, British Columbia, Canada, jointly with the International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials (PFM). Over a period of four days, approximately 400 scientists, engineers, and students from around the world presented their work and discussed the latest developments in the field of ferroelectrics, related materials, and their applications. It is particularly encouraging to see that a large number of students (115) were attracted to the joint conference and presented high-quality research works. This trend is not only important to this conference series, but more importantly, it is vital to the future of the ferroelectrics field.

  20. Interoperability of medical device information and the clinical applications: an HL7 RMIM based on the ISO/IEEE 11073 DIM.

    Science.gov (United States)

    Yuksel, Mustafa; Dogac, Asuman

    2011-07-01

    Medical devices are essential to the practice of modern healthcare services. Their benefits will increase if clinical software applications can seamlessly acquire the medical device data. The need to represent medical device observations in a format that can be consumable by clinical applications has already been recognized by the industry. Yet, the solutions proposed involve bilateral mappings from the ISO/IEEE 11073 Domain Information Model (DIM) to specific message or document standards. Considering that there are many different types of clinical applications such as the electronic health record and the personal health record systems, the clinical workflows, and the clinical decision support systems each conforming to different standard interfaces, detailing a mapping mechanism for every one of them introduces significant work and, thus, limits the potential health benefits of medical devices. In this paper, to facilitate the interoperability of clinical applications and the medical device data, we use the ISO/IEEE 11073 DIM to derive an HL7 v3 Refined Message Information Model (RMIM) of the medical device domain from the HL7 v3 Reference Information Mode (RIM). This makes it possible to trace the medical device data back to a standard common denominator, that is, HL7 v3 RIM from which all the other medical domains under HL7 v3 are derived. Hence, once the medical device data are obtained in the RMIM format, it can easily be transformed into HL7-based standard interfaces through XML transformations because these interfaces all have their building blocks from the same RIM. To demonstrate this, we provide the mappings from the developed RMIM to some of the widely used HL7 v3-based standard interfaces.

  1. Adaptive management of energy consumption, reliability and delay of wireless sensor node: Application to IEEE 802.15.4 wireless sensor node.

    Science.gov (United States)

    Kone, Cheick Tidjane; Mathias, Jean-Denis; De Sousa, Gil

    2017-01-01

    Designing a Wireless Sensor Network (WSN) to achieve a high Quality of Service (QoS) (network performance and durability) is a challenging problem. We address it by focusing on the performance of the 802.15.4 communication protocol because the IEEE 802.15.4 Standard is actually considered as one of the reference technologies in WSNs. In this paper, we propose to control the sustainable use of resources (i.e., energy consumption, reliability and timely packet transmission) of a wireless sensor node equipped with photovoltaic cells by an adaptive tuning not only of the MAC (Medium Access Control) parameters but also of the sampling frequency of the node. To do this, we use one of the existing control approaches, namely the viability theory, which aims to preserve the functions and the controls of a dynamic system in a set of desirable states. So, an analytical model, describing the evolution over time of nodal resources, is derived and used by a viability algorithm for the adaptive tuning of the IEEE 802.15.4 MAC protocol. The simulation analysis shows that our solution allows ensuring indefinitely, in the absence of hardware failure, the operations (lifetime duration, reliability and timely packet transmission) of an 802.15.4 WSN and one can temporarily increase the sampling frequency of the node beyond the regular sampling one. This latter brings advantages for agricultural and environmental applications such as precision agriculture, flood or fire prevention. Main results show that our current approach enable to send more information when critical events occur without the node runs out of energy. Finally, we argue that our approach is generic and can be applied to other types of WSN.

  2. Adaptive management of energy consumption, reliability and delay of wireless sensor node: Application to IEEE 802.15.4 wireless sensor node

    Science.gov (United States)

    2017-01-01

    Designing a Wireless Sensor Network (WSN) to achieve a high Quality of Service (QoS) (network performance and durability) is a challenging problem. We address it by focusing on the performance of the 802.15.4 communication protocol because the IEEE 802.15.4 Standard is actually considered as one of the reference technologies in WSNs. In this paper, we propose to control the sustainable use of resources (i.e., energy consumption, reliability and timely packet transmission) of a wireless sensor node equipped with photovoltaic cells by an adaptive tuning not only of the MAC (Medium Access Control) parameters but also of the sampling frequency of the node. To do this, we use one of the existing control approaches, namely the viability theory, which aims to preserve the functions and the controls of a dynamic system in a set of desirable states. So, an analytical model, describing the evolution over time of nodal resources, is derived and used by a viability algorithm for the adaptive tuning of the IEEE 802.15.4 MAC protocol. The simulation analysis shows that our solution allows ensuring indefinitely, in the absence of hardware failure, the operations (lifetime duration, reliability and timely packet transmission) of an 802.15.4 WSN and one can temporarily increase the sampling frequency of the node beyond the regular sampling one. This latter brings advantages for agricultural and environmental applications such as precision agriculture, flood or fire prevention. Main results show that our current approach enable to send more information when critical events occur without the node runs out of energy. Finally, we argue that our approach is generic and can be applied to other types of WSN. PMID:28235097

  3. The First IEEE International Symposium On Industrial Electronics Held in Xi'an

    Institute of Scientific and Technical Information of China (English)

    1992-01-01

    The First IEEE International symposium on Industrial Electronics (ISIE) was held at Holiday Inn,xian, P.R.China on May 25-29,1992. The symposium was jointly sponsored by the IEEE Industrial Electronics Society(IES), the IEEE Beijing Section, the Society of Instrument and Control Engineers((?)pan), and the Shaanxi Provincial science and Technology Commission, in cooperation with Northwestern Polytechnieal University(NPU), Xian Jiaotong University and Xidian University.

  4. Introduction to the special issue on the joint meeting of the 19th IEEE International Symposium on the Applications of Ferroelectrics and the 10th European Conference on the Applications of Polar Dielectrics.

    Science.gov (United States)

    Tsurumi, Takaaki

    2011-09-01

    The joint meeting of the 19th IEEE International Symposium on the Applications of Ferroelectrics and the 10th European Conference on the Applications of Polar Dielectrics took place in Edinburgh from August 9-12, 2010. The conference was attended by 390 delegates from more than 40 different countries. There were 4 plenary speakers, 56 invited speakers, and a further 222 contributed oral presentations in 7 parallel session. In addition there were 215 poster presentations. Key topics addressed at the conference included piezoelectric materials, leadfree piezoelectrics, and multiferroics.

  5. Development of Cell Phone Application for Blood Glucose Self-Monitoring Based on ISO/IEEE 11073 and HL7 CCD

    Science.gov (United States)

    Park, Hyun Sang; Cho, Hune

    2015-01-01

    Objectives The objectives of this research were to develop and evaluate a cell phone application based on the standard protocol for personal health devices and the standard information model for personal health records to support effective blood glucose management and standardized service for patients with diabetes. Methods An application was developed for Android 4.0.3. In addition, an IEEE 11073 Manager, Medical Device Encoding Rule, and Bluetooth Health Device Profile Connector were developed for standardized health communication with a glucometer, and a Continuity of Care Document (CCD) Composer and CCD Parser were developed for CCD document exchange. The developed application was evaluated by five healthcare professionals and 87 users through a questionnaire comprising the following variables: usage intention, effort expectancy, social influence, facilitating condition, perceived risk, and voluntariness. Results As a result of the evaluation of usability, it was confirmed that the developed application is useful for blood glucose self-monitoring by diabetic patients. In particular, the healthcare professionals stated their own views that the application is useful to observe the trends in blood glucose change through the automatic function which records a blood glucose level measured using Bluetooth function, and the function which checks accumulated records of blood glucose levels. Also, a result of the evaluation of usage intention was 3.52 ± 0.42 out of 5 points. Conclusions The application developed by our research team was confirmed by the verification of healthcare professionals that accurate feedback can be provided to healthcare professionals during the management of diabetic patients or education for glucose management. PMID:25995960

  6. Development of Cell Phone Application for Blood Glucose Self-Monitoring Based on ISO/IEEE 11073 and HL7 CCD.

    Science.gov (United States)

    Park, Hyun Sang; Cho, Hune; Kim, Hwa Sun

    2015-04-01

    The objectives of this research were to develop and evaluate a cell phone application based on the standard protocol for personal health devices and the standard information model for personal health records to support effective blood glucose management and standardized service for patients with diabetes. An application was developed for Android 4.0.3. In addition, an IEEE 11073 Manager, Medical Device Encoding Rule, and Bluetooth Health Device Profile Connector were developed for standardized health communication with a glucometer, and a Continuity of Care Document (CCD) Composer and CCD Parser were developed for CCD document exchange. The developed application was evaluated by five healthcare professionals and 87 users through a questionnaire comprising the following variables: usage intention, effort expectancy, social influence, facilitating condition, perceived risk, and voluntariness. As a result of the evaluation of usability, it was confirmed that the developed application is useful for blood glucose self-monitoring by diabetic patients. In particular, the healthcare professionals stated their own views that the application is useful to observe the trends in blood glucose change through the automatic function which records a blood glucose level measured using Bluetooth function, and the function which checks accumulated records of blood glucose levels. Also, a result of the evaluation of usage intention was 3.52 ± 0.42 out of 5 points. The application developed by our research team was confirmed by the verification of healthcare professionals that accurate feedback can be provided to healthcare professionals during the management of diabetic patients or education for glucose management.

  7. IEEE Prize for Lucio Rossi

    CERN Multimedia

    IEEE Council on Superconductivity

    2007-01-01

    Lucio Rossi receives his prize from John Spargo, Chairman of the IEEE Council on Superconductivity (left), and Martin Nisenoff, Chairman of the Council on Superconductivity's Awards Committee (right).

  8. Proceedings of the IEEE Machine Learning for Signal Processing XVII

    DEFF Research Database (Denmark)

    , and two papers from the winners of the Data Analysis Competition. The program included papers in the following areas: genomic signal processing, pattern recognition and classification, image and video processing, blind signal processing, models, learning algorithms, and applications of machine learning......The seventeenth of a series of workshops sponsored by the IEEE Signal Processing Society and organized by the Machine Learning for Signal Processing Technical Committee (MLSP-TC). The field of machine learning has matured considerably in both methodology and real-world application domains and has....... The program featured a Special Session on Genomic Signal Processing, chaired by Prof. Man-Wai Mak from Hong Kong Polytechnic University, Hong Kong. The session included four refereed papers by leading experts in the field. We also continued the tradition of the Data Analysis Competition thanks to the efforts...

  9. IEEE WEA 2012 - Mejores Trabajos

    Directory of Open Access Journals (Sweden)

    Miguel Alberto Melgarejo Rey

    2013-06-01

    Full Text Available El 2012 Workshop on Engineering Applications (WEA 2012 realizado porla Facultad de Ingeniería de la Universidad Distrital Francisco José deCaldas y su rama estudiantil IEEE (Institute for Electrical and ElectronicsEngineers, del 2 al 4 de mayo de 2012, fue un espacio académico dondeconvergieron academia e industria alrededor de áreas tan diversas comoel control, las comunicaciones, la electrónica de potencia, el procesamientode señales entre otras .A pesar de ser la primera edición delWEA, esta se caracterizó por una nutrida participación, se recibieron 69artículos, 49 provenientes de Colombia y 20 de otros países.

  10. IEEE 802.14.5/ZigBee Based WSNs - WPANs and Innovative Application in Medical Health Care Systems.

    Science.gov (United States)

    Zhang, Zhongwei

    2014-01-01

    With recent developments in wireless networks field and in sensing technology, new and innovative medical applications based on the wireless sensor networks (WSN) technology are being developed in the research lab or commercial sectors. The key problem of WSN based application in the medical and health care domain is to get the message with the bounded delays and/or real-time data such as the signal of falls, the alarm of heart attacks traversed to the cluster at where the emergence unit located while delivering the steady flows of data with a certain level of Quality of Service (QoS). In this paper, we address this problem by proposing to use a periodic scheduling-Time Division Cluster Schedule (TDCS), to avoid the flow collision while meeting the end-to-end delay deadlines. The proposed scheduling mechanism has been studied on simulated Wireless sensor networks with a cluster tree topology on which the OPEN-ZB simulation model is adopted. The preliminary results shown that it is feasible to guarantee the real time medical data delivered on time over the low data rate wireless sensor networks when deployed at medical and/or health care domain, under the governance of the TDCS mechanism.

  11. 2015 Applications in Electronics Pervading Industry, Environment and Society Conference

    CERN Document Server

    2017-01-01

    This book provides a thorough overview of cutting-edge research on electronics applications relevant to industry, the environment, and society at large. It covers a broad spectrum of application domains, from automotive to space and from health to security, while devoting special attention to the use of embedded devices and sensors for imaging, communication and control. The book is based on the 2015 ApplePies Conference, held in Rome, which brought together researchers and stakeholders to consider the most significant current trends in the field of applied electronics and to debate visions for the future. Areas addressed by the conference included information communication technology; biotechnology and biomedical imaging; space; secure, clean and efficient energy; the environment; and smart, green and integrated transport. As electronics technology continues to develop apace, constantly meeting previously unthinkable targets, further attention needs to be directed toward the electronics applications and the ...

  12. Applications in Electronics Pervading Industry, Environment and Society

    CERN Document Server

    2016-01-01

    This book provides a thorough overview of cutting-edge research on electronics applications relevant to industry, the environment, and society at large. A wide spectrum of application domains are covered, from automotive to space and from health to security, and special attention is devoted to the use of embedded devices and sensors for imaging, communication, and control. The book is based on the 2014 APPLEPIES Conference, held in Rome, which brought together researchers and stakeholders to consider the most significant current trends in the field of applied electronics and to debate visions for the future. Areas covered by the conference included information communication technology; biotechnology and biomedical imaging; space; secure, clean, and efficient energy; the environment; and smart, green, and integrated transport. As electronics technology continues to develop apace, constantly meeting previously unthinkable targets, further attention needs to be directed toward the electronics applications and th...

  13. Design of Low Phase Noise SIPC based Complementary LC-QVCO for IEEE 802.11a Application

    Directory of Open Access Journals (Sweden)

    Harikrishnan Ramiah

    2008-01-01

    Full Text Available The paper presents the design of a source injection parallel coupled (SIPC quadrature voltage controlled oscillator (QVCO, realized in a complementary architecture, which is usually preferred in low-power applications as it exploits 50% bias current reduction with double efficiency compared to the structure with single coupled, when operating in the current-limited regime. A stacked spiral inductor exhibiting a Q factor of 5.8, with pMOS based depletion mode varactor of 32% in tuning range, corresponding to 3.2-3.6GHz of tuning frequency, is implemented in 0.18m CMOS technology. The phase noise of the SIPC QVCO architecture simulated at 1MHz of offset frequency is indicated to be -114.3dBc/Hz, while dissipating 11.0mW of core circuit power.

  14. Access to IEEE Electronic Library

    CERN Multimedia

    2007-01-01

    From 2007, the CERN Library now offers readers online access to the complete IEEE Electronic Library (Institute of Electrical and Electronics Engineers). This new licence gives unlimited online access to all IEEE and IET (previously IEE) journals and proceedings as well as all current IEEE standards and selected archived ones. Some of the titles offer volumes back to 1913. This service currently represents more than 1,400,000 full-text articles! This leading engineering information resource replaces the previous service, a sub-product of the IEEE database called 'IEEE Enterprise', which offered online access to the complete collection of IEEE journals and proceedings, but with limited features. The service had become so popular that the CERN Working Group for Acquisitions recommended that the Library subscribe to the complete IEEE Electronic Library for 2007. Usage statistics for recent months showed there was a demand for the service from a large community of CERN users and we were aware that many users h...

  15. Configuring Embeddable Adaptive Computing Systems for Multiple Application Domains with Minimal Size, Weight, and Power

    Science.gov (United States)

    2003-09-01

    Lecture Notes in Computer Science 1388: Parallel and Distributed Processing, edited by Jose...Systems and Applications (EHPC ‘98), in Lecture Notes in Computer Science 1388: Parallel and Distributed Processing, edited by Jose Rolim, sponsor: IEEE...Applications (EHPC 2000), in Lecture Notes in Computer Science , IPDPS 2000 Workshops, sponsor: IEEE Computer Society, Cancun, Mexico, May 2000, pp. 776-

  16. 适用于数字化变电站的IEEE1588测试仪的研制%Development of IEEE1588 tester for digital substation

    Institute of Scientific and Technical Information of China (English)

    陈炯聪; 崔全胜; 魏勇; 郑运召

    2012-01-01

    According to IEEE 1588 protocol testing requirements in digital substation, a development scheme of IEEE1588 tester for digital substation is proposed. The scheme analyzes the IEEE1588 tester's system functional requirements, introduces its hardware & software design, and studies the control mode of test cases and test automation implementation. Using the closed loop test system, IEEE1588 conformance testing of intelligent devices in digital substation can be achieved. The practical testing application shows that the tester can correctly perform real-time closed-loop IEEE] 588 conformance testing of intelligent devices, can significantly improve the testing efficiency of IEEE1588 protocol, so it can ensure the accuracy and reliability of IEEE1588 protocol implementation of intelligent devices.%针对数字化变电站中智能设备的IEEE1588协议测试需求,提出了一种适用于数字化变电站的IEEE1588测试仪的研制方案.该方案分析了IEEE1588测试仪的系统功能要求、介绍了其硬件及软件设计,并研究了测试案例控制模式和测试自动化实现.利用该测试仪构成的闭环测试系统,可以实现数字化变电站中智能设备的IEEE1588协议一致性测试.实际应用效果表明该测试仪能正确完成智能设备的IEEE1588协议实时闭环测试,可显著提高智能设备IEEE1588协议测试效率,确保智能设备IEEE1588协议实现的正确性和可靠性.

  17. Proceedings of the IEEE 2003 Neural Networks for Signal Processing Workshop

    DEFF Research Database (Denmark)

    Larsen, Jan

    This proceeding contains refereed papers presented at the thirteenth IEEE Workshop on Neural Networks for Signal Processing (NNSP’2003), held at the Atria-Mercure Conference Center, Toulouse, France, September 17-19, 2003. The Neural Networks for Signal Processing Technical Committee of the IEEE...... Signal Processing Society organized the workshop with sponsorship of the Signal Processing Society and the co-operation of the IEEE Neural Networks Society. The IEEE Press published the previous twelve volumes of the NNSP Workshop proceedings in a hardbound volume. This year, the bound volume...... is to be published by IEEE following the workshop, and we are pleased to inaugurate a new CDROM electronic format, which maintains the same standard as the printed version and facilitates the reading and searching of the papers. In recent years, the field of neural networks has matured considerably in both...

  18. Proceedings of the IEEE 2003 Neural Networks for Signal Processing Workshop

    DEFF Research Database (Denmark)

    Larsen, Jan

    This proceeding contains refereed papers presented at the thirteenth IEEE Workshop on Neural Networks for Signal Processing (NNSP’2003), held at the Atria-Mercure Conference Center, Toulouse, France, September 17-19, 2003. The Neural Networks for Signal Processing Technical Committee of the IEEE...... Signal Processing Society organized the workshop with sponsorship of the Signal Processing Society and the co-operation of the IEEE Neural Networks Society. The IEEE Press published the previous twelve volumes of the NNSP Workshop proceedings in a hardbound volume. This year, the bound volume...... is to be published by IEEE following the workshop, and we are pleased to inaugurate a new CDROM electronic format, which maintains the same standard as the printed version and facilitates the reading and searching of the papers. In recent years, the field of neural networks has matured considerably in both...

  19. IEEE TRANSACTIONS ON CYBERNETICS

    Energy Technology Data Exchange (ETDEWEB)

    Craig R. RIeger; David H. Scheidt; William D. Smart

    2014-11-01

    MODERN societies depend on complex and critical infrastructures for energy, transportation, sustenance, medical care, emergency response, communications security. As computers, automation, and information technology (IT) have advanced, these technologies have been exploited to enhance the efficiency of operating the processes that make up these infrastructures

  20. American Meteor Society Fireball reporting system and mobile application

    Science.gov (United States)

    Hankey, M.

    2014-07-01

    The American Meteor Society (AMS) founded in 1911 pioneered the visual study of meteors and has collected data relating to meteor observations and bright fireballs for over 100 years. In December 2010, the online fireball reporting system was upgraded to an interactive application that utilizes Google Maps and other programmatic methods to pinpoint the observer's location, azimuth and elevation values with a high degree of precision. The AMS has collected 10s of 1000s of witness reports relating to 100s of events each year since the new application was released. Three dimensional triangulation methods that average the data collected from witnesses have been developed that can determine the start and end points of the meteor with an accuracy of saw the fireball. This process is designed to require no button click or user interaction to start and stop the time recording. A count down initiates the process and once the user's phone crosses the plane of azimuth for the end point of the fireball the velocity timer automatically stops. Users are asked to log the recording three times in an effort to minimize error. The three values are then averaged into a final score. Once enough witnesses have filed reports, elapsed time data collected from the mobile phone can be used to determine the velocity of the fireball. With the velocity, trajectory solution and RA/DEC the AMS can plot orbital estimates for significant fireball events reported to the society. Our hope is that overtime this catalog of events will reveal patterns relating to the origins of bright fireballs at certain times of year. The AMS also hopes to be able to associate fireball events reported to the society with known meteor showers when RA/DEC radiant estimates fall close enough to those of known showers. In addition to the enhanced fireball reporting application, the AMS Mobile App provides a meteor shower calendar with information, radiant maps and moon conditions for all upcoming showers. There is also

  1. Proceedings of IEEE Workshop on Machine Learning for Signal Processing XIV

    DEFF Research Database (Denmark)

    Larsen, Jan

    This proceeding contains refereed papers presented at the fourteenth IEEE Workshop on Machine for Signal Processing (MLSP’2004), held at S\\~ao Luís, Maranh\\~ao, Brazil, September 29-October 1, 2004. This is a continuation of the IEEE workshops on Neural Networks for Signal Processing (NNSP...... by the Machine Learning for Signal Processing Technical Committee with sponsorship of the IEEE Signal Processing Society. Following the practice started last year, the bound volume of the proceedings is going to be published by IEEE following the workshop, and we are pleased to offer to conference attendees...

  2. Proceedings of IEEE Workshop on Machine Learning for Signal Processing XIV

    DEFF Research Database (Denmark)

    Larsen, Jan

    This proceeding contains refereed papers presented at the fourteenth IEEE Workshop on Machine for Signal Processing (MLSP’2004), held at S\\~ao Luís, Maranh\\~ao, Brazil, September 29-October 1, 2004. This is a continuation of the IEEE workshops on Neural Networks for Signal Processing (NNSP...... by the Machine Learning for Signal Processing Technical Committee with sponsorship of the IEEE Signal Processing Society. Following the practice started last year, the bound volume of the proceedings is going to be published by IEEE following the workshop, and we are pleased to offer to conference attendees...

  3. Eleanor McElwee and the Formation of IEEE PCS

    Science.gov (United States)

    Malone, Edward A.

    2015-01-01

    This article examines the historical professional project that created the Institute of Radio Engineers' Professional Group on Engineering Writing an Speech (IRE PGEWS)--now called the Institute of Electrical and Electronics Engineers' Professional Communication Society (IEEE PCS)--and recounts the group's early history in detail. It also traces…

  4. Eleanor McElwee and the Formation of IEEE PCS

    Science.gov (United States)

    Malone, Edward A.

    2015-01-01

    This article examines the historical professional project that created the Institute of Radio Engineers' Professional Group on Engineering Writing an Speech (IRE PGEWS)--now called the Institute of Electrical and Electronics Engineers' Professional Communication Society (IEEE PCS)--and recounts the group's early history in detail. It also traces…

  5. IEEE prize awarded to CERN PhD student

    CERN Multimedia

    2006-01-01

    Rafael Ballabriga Suñe is the recipient of the 2006 Institute of Electrical and Electronics Engineers, Inc. (IEEE) Nuclear and Plasma Sciences Society (NPSS)'s Student Paper Award. Ballabriga's winning paper reported on a prototype chip, which belongs to a new generation of single photon counting hybrid pixel detector readout chips - Medipix3. The award was presented by the deputy programme chair Vince Cianciolo (left) at the IEEE Nuclear Science Symposium held in San Diego on 29 October to 4 November.

  6. ICT for society through society: Application of code-sprints as entrepreneurial enabler

    CSIR Research Space (South Africa)

    Coetzee, L

    2010-08-31

    Full Text Available Information and Communications Technology for Development (ICT4D) is faced with the challenge of creating sustainable and innovative success stories which speak to the creation of an inclusive digital society. Initial attempts at ICT4D had limited...

  7. On IEEE 802.15.6 IR-UWB receivers - simulations for DBPSK modulation.

    Science.gov (United States)

    Niemelä, Ville; Hämäläinen, Matti; Iinatti, Jari

    2013-01-01

    In 2002, Federal Communications Commission (FCC) was the first in defining regulations for ultra wideband (UWB) communications followed by Europe and Japan some years later. Focusing on impulse radio (IR) UWB, in 2007 was the time for the first published standard targeting in personal area networks, released by the IEEE. The second IEEE released standard including UWB definitions is targeted for wireless body area networks (WBAN) and was published in 2012. As the wireless communications has been and will be passing through almost any levels in society, the natural step with WBAN is using it in different medical, healthcare and wellbeing applications. The arguments for these are related to the modern lifestyle, in which people have increasingly more free time and are more interested in taking care of their health and wellbeing. Another challenge is the population composition, i.e., aging in developed countries which call for new solutions and procedures, particularly from cost wise. In this paper, we are evaluating UWB receivers based on the IEEE 802.15.6 physical layer definitions and capable of detecting differentially encoded modulation. The evaluation is performed using two different WBAN channel models.

  8. IEEE Conference Publications in Libraries.

    Science.gov (United States)

    Johnson, Karl E.

    1984-01-01

    Conclusions of surveys (63 libraries, OCLC database, University of Rhode Island users) assessing handling of Institute of Electrical and Electronics Engineers (IEEE) conference publications indicate that most libraries fully catalog these publications using LC cataloging, and library patrons frequently require series access to publications. Eight…

  9. IEEE Conference Publications in Libraries.

    Science.gov (United States)

    Johnson, Karl E.

    1984-01-01

    Conclusions of surveys (63 libraries, OCLC database, University of Rhode Island users) assessing handling of Institute of Electrical and Electronics Engineers (IEEE) conference publications indicate that most libraries fully catalog these publications using LC cataloging, and library patrons frequently require series access to publications. Eight…

  10. IEEE 802.15.4 MAC with GTS transmission for heterogeneous devices with application to wheelchair body-area sensor networks.

    Science.gov (United States)

    Shrestha, Bharat; Hossain, Ekram; Camorlinga, Sergio

    2011-09-01

    In wireless personal area networks, such as wireless body-area sensor networks, stations or devices have different bandwidth requirements and, thus, create heterogeneous traffics. For such networks, the IEEE 802.15.4 medium access control (MAC) can be used in the beacon-enabled mode, which supports guaranteed time slot (GTS) allocation for time-critical data transmissions. This paper presents a general discrete-time Markov chain model for the IEEE 802.15.4-based networks taking into account the slotted carrier sense multiple access with collision avoidance and GTS transmission phenomena together in the heterogeneous traffic scenario and under nonsaturated condition. For this purpose, the standard GTS allocation scheme is modified. For each non-identical device, the Markov model is solved and the average service time and the service utilization factor are analyzed in the non-saturated mode. The analysis is validated by simulations using network simulator version 2.33. Also, the model is enhanced with a wireless propagation model and the performance of the MAC is evaluated in a wheelchair body-area sensor network scenario.

  11. Achievable Rate Estimation of IEEE 802.11ad Visual Big-Data Uplink Access in Cloud-Enabled Surveillance Applications.

    Science.gov (United States)

    Kim, Joongheon; Kim, Jong-Kook

    2016-01-01

    This paper addresses the computation procedures for estimating the impact of interference in 60 GHz IEEE 802.11ad uplink access in order to construct visual big-data database from randomly deployed surveillance camera sensing devices. The acquired large-scale massive visual information from surveillance camera devices will be used for organizing big-data database, i.e., this estimation is essential for constructing centralized cloud-enabled surveillance database. This performance estimation study captures interference impacts on the target cloud access points from multiple interference components generated by the 60 GHz wireless transmissions from nearby surveillance camera devices to their associated cloud access points. With this uplink interference scenario, the interference impacts on the main wireless transmission from a target surveillance camera device to its associated target cloud access point with a number of settings are measured and estimated under the consideration of 60 GHz radiation characteristics and antenna radiation pattern models.

  12. IEEE Prize for Lucio Rossi

    CERN Multimedia

    2007-01-01

    Lucio Rossi receives his prize from John Spargo, Chairman of the IEEE Council on Superconductivity (left), and Martin Nisenoff, Chairman of the Council on Superconductivity’s Awards Committee (right). (Photo: IEEE Council on Superconductivity)With the magnets installed in the tunnel and work on the interconnections almost completed, Lucio Rossi has reaped the rewards of fifteen years of work. And yet, when the physicist from Milan arrived to take charge of the group responsible for the superconducting magnets in 2001, success seemed far from assured. Endowed with surprising levels of energy, Lucio Rossi, together with his team, ensured that production of these highly complex magnets got underway. Today, that achievement earns them the recognition not only of CERN but also of the international superconducting community. It is for this achievement that Lucio Rossi was awarded the prize by the IEEE’s (Institute of Electrical an...

  13. FIRST CALL FOR PAPERS The Second IEEE Pacific-Rim Conference on Multimedia

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Oct. 24~26, 2001, Beijing, China http://research.microsoft.com/~PCM2001. IEEE Signal Processing Society, IEEE Circuits and Systems Society National Science Foundation of China IEEE China, Electronics Society Of China, China Society of Electronics China Society of Computers, China Society of Image and Graphics   The second IEEE Pacific-Rim Conference on Multimedia will be held in Beijing in the next “golden autumn”. Beijing has been the culture capital of Chinese for near one thousand years with many historical palaces, magnificent museums and beautiful parks, as well as rich culture activities. In the last decade, Beijing has also witnessed spectacular growth of hi-tech industry, especially in the Internet and multimedia applications areas. The conference site, Zhongguangchun, known as China's Silicon Valley, is the national center of research, development and education with hundreds of universities and research institutions, and many successful companies providing both multimedia content and systems expertise. The conference complements this wonderful setting by providing a forum to presenting and exploring technological and artistic advancements in multimedia. Technical issues, theory and practice, artistic and consumer innovations will bring together researchers, artists, developers, educators, performers, and practitioners of multimedia from Pacific-Rim and the world. Present your work at PCM2001 and define the future of multimedia in the next millennium!   The technical program will feature keynote addresses, tutorials, special sessions, panels, technical demonstrations, in addition to technical presentations of refereed papers. We cordially invite you to submit your work in one or more of about forms for, but not limited to, the following three areas:   Multimedia processing and coding, including multimedia processing and compression, content analysis, content-based retrieval, watermarking and security;   Multimedia system support and

  14. The Engineering Societies & Continuing Education.

    Science.gov (United States)

    Professional Engineer, 1979

    1979-01-01

    Gives a description of what the major engineering societies (ASCE, ASME, AICHE, and IEEE) are doing in the area of continuing education. The description includes the short courses, their costs, duration, type and scope of the content. (GA)

  15. The Engineering Societies & Continuing Education.

    Science.gov (United States)

    Professional Engineer, 1979

    1979-01-01

    Gives a description of what the major engineering societies (ASCE, ASME, AICHE, and IEEE) are doing in the area of continuing education. The description includes the short courses, their costs, duration, type and scope of the content. (GA)

  16. A formal analysis of ISO/IEEE P11073-20601 standard of medical device communication

    NARCIS (Netherlands)

    Goga, Nicolae; Costache, Stefania; Moldoveanu, Florica

    2009-01-01

    This article presents the formal work done for the ISO/IEEE P11073-20601 Draft Standard for Health informatics - Personal health device communication - Application profile Optimized exchange protocol. ISO/IEEE 11073 family defines standards for device communication between agents (e.g. blood pressur

  17. Design Optimization of Cyber-Physical Distributed Systems using IEEE Time-sensitive Networks (TSN)

    DEFF Research Database (Denmark)

    Pop, Paul; Lander Raagaard, Michael; Craciunas, Silviu S.

    2016-01-01

    In this paper we are interested in safety-critical real-time applications implemented on distributed architectures supporting the Time-SensitiveNetworking (TSN) standard. The ongoing standardization of TSN is an IEEE effort to bring deterministic real-time capabilities into the IEEE 802.1 Ethernet...

  18. Throughput Limits of IEEE 802.11 and IEEE 802.15.3

    OpenAIRE

    Ullah, Sana; Zhong, Yingji; Islam, S. M. Riazul; Nessa, Ahasanun; Kwak, Kyung Sup

    2009-01-01

    IEEE 802.11 and IEEE 802.15.3 are wireless standards originally designed for wireless local area network (WLAN) and wireless personal area network (WPAN). This paper studies MAC throughput analysis of both standards. We present a comparative analysis of both standards in terms of MAC throughput and bandwidth efficiency. Numerical results show that the performance of IEEE 802.15.3 transcends IEEE 802.11 in all cases.

  19. NIH-IEEE 2015 Strategic Conference on Healthcare Innovations and Point-of-Care Technologies for Prec

    Science.gov (United States)

    NIH and the Institute for Electrical and Electronics Engineering, Engineering in Medicine and Biology Society (IEEE/EMBS) hosted the third iteration of the Healthcare Innovations and Point-of-Care Technologies Conference last week.

  20. Method of Testing High Speed Digital Network Based on IEEE 1149. 6 Standard%基于IEEE 1149.6标准的高速数字网络测试方法

    Institute of Scientific and Technical Information of China (English)

    尤路

    2015-01-01

    As requirement of high speed signal testing increases gradually, the application prospect of the IEEE 1149. 6 standard becomes more and more extensively. Starting from generation of IEEE 1149. 6 standard, the difference between the IEEE 1149. 1 and IEEE 1149. 6 standards is introduced. The fault type of the IEEE 1149. 6 standard is introduced in detail by way of test verification example. This method is functioned obviously in testing high speed digital circuit channel.%随着高速信号测试需求的逐渐增加,IEEE 1149.6标准的应用前景越来越广,本文从IEEE 1149.6标准的产生入手,主要介绍了IEEE 1149.6标准与IEEE 1149.1标准的区别,后文中通过测试验证实例,详细介绍了IEEE 1149.6标准中的故障类型,该方法目前已在数字电路高速通道测试中凸显作用。

  1. Chair's Introduction to 2009 IEEE Circuits and Systems International Conference on Testing and Diagnosis

    Institute of Scientific and Technical Information of China (English)

    Rueywen Liu

    2009-01-01

    @@ Based on the recommendation of ICTD'09 TPC members, this Special Issue of the Journal of Electronic Science & Technology of China (JESTC) contained 22 high quality papers selected from the Proceedings of 2009 IEEE Circuits and Systems International Conference on Testing and Diagnosis (ICTD'09) which is fully sponsored by the IEEE Circuits and Systems Society (CASS), and is technically co-sponsored by the University of Electronic Science and Technology of China (UESTC), the Chinese Institute of Electronics (CIE), the China Instrument & Control Society (CIS), and organized by UESTC.

  2. IEEE 802.11ah: A Technology to Face the IoT Challenge

    Directory of Open Access Journals (Sweden)

    Victor Baños-Gonzalez

    2016-11-01

    Full Text Available Since the conception of the Internet of things (IoT, a large number of promising applications and technologies have been developed, which will change different aspects in our daily life. This paper explores the key characteristics of the forthcoming IEEE 802.11ah specification. This future IEEE 802.11 standard aims to amend the IEEE 802.11 legacy specification to support IoT requirements. We present a thorough evaluation of the foregoing amendment in comparison to the most notable IEEE 802.11 standards. In addition, we expose the capabilities of future IEEE 802.11ah in supporting different IoT applications. Also, we provide a brief overview of the technology contenders that are competing to cover the IoT communications framework. Numerical results are presented showing how the future IEEE 802.11ah specification offers the features required by IoT communications, thus putting forward IEEE 802.11ah as a technology to cater the needs of the Internet of Things paradigm.

  3. IEEE 802.11ah: A Technology to Face the IoT Challenge.

    Science.gov (United States)

    Baños-Gonzalez, Victor; Afaqui, M Shahwaiz; Lopez-Aguilera, Elena; Garcia-Villegas, Eduard

    2016-11-22

    Since the conception of the Internet of things (IoT), a large number of promising applications and technologies have been developed, which will change different aspects in our daily life. This paper explores the key characteristics of the forthcoming IEEE 802.11ah specification. This future IEEE 802.11 standard aims to amend the IEEE 802.11 legacy specification to support IoT requirements. We present a thorough evaluation of the foregoing amendment in comparison to the most notable IEEE 802.11 standards. In addition, we expose the capabilities of future IEEE 802.11ah in supporting different IoT applications. Also, we provide a brief overview of the technology contenders that are competing to cover the IoT communications framework. Numerical results are presented showing how the future IEEE 802.11ah specification offers the features required by IoT communications, thus putting forward IEEE 802.11ah as a technology to cater the needs of the Internet of Things paradigm.

  4. TCP over IEEE 802.11

    Directory of Open Access Journals (Sweden)

    P. Chenna Reddy

    2009-01-01

    Full Text Available IEEE 802.11 is a widely used wireless LAN standard for medium access control. TCP is a prominent transport protocol originally designed for wired networks. TCP treats packet loss as congestion and reduces the data rate. In wireless networks packets are lost not only due to congestion but also due to various other reasons. Hence there is need for making TCP adaptable to wireless networks. Various parameters of TCP and IEEE 802.11 can be set to appropriate values to achieve optimum performance results. In this paper optimum values for various parameters of IEEE 802.11 are determined. Network simulator NS2 is used for simulation.

  5. Interoperability in wireless sensor networks based on IEEE 1451 standard

    OpenAIRE

    Higuera Portilla, Jorge Eduardo; Polo Cantero, José

    2012-01-01

    The syntactic and semantic interoperability is a challenge of the Wireless Sensor Networks (WSN) with smart sensors in pervasive computing environments to increase their harmonization in a wide variety of applications. This chapter contains a detailed description of interoperability in heterogeneous WSN using the IEEE 1451 standard. This work focuses on personal area networks (PAN) with smart sensors and actuators. Also, a technical, syntactic and semantic levels of interoperability based on ...

  6. Interoperability in wireless sensor networks based on IEEE 1451 standard

    OpenAIRE

    Higuera Portilla, Jorge Eduardo; Polo Cantero, José

    2012-01-01

    The syntactic and semantic interoperability is a challenge of the Wireless Sensor Networks (WSN) with smart sensors in pervasive computing environments to increase their harmonization in a wide variety of applications. This chapter contains a detailed description of interoperability in heterogeneous WSN using the IEEE 1451 standard. This work focuses on personal area networks (PAN) with smart sensors and actuators. Also, a technical, syntactic and semantic levels of interoperability based on ...

  7. CERN receives prestigious Milestone recognition from IEEE

    CERN Multimedia

    2005-01-01

    At a ceremony at CERN, Mr W. Cleon Anderson, President of the Institute of Electrical and Electronics Engineers (IEEE) formally a Milestone plaque in recognition of the invention of electronic particle detectors at CERN

  8. 2007 IEEE Device Research Conference: Tour de Force Multigate and Nanowire Metal Oxide Semiconductor Field-Effect Transistors and Their Application.

    Science.gov (United States)

    Zhang, Pengpeng; Mayer, Theresa S; Jackson, Thomas N

    2007-08-01

    Scaling of the conventional planar complementary metal oxide semiconductor (CMOS) faces many challenges. Top-down fabricated gate-all-around Si nanowire FinFETs, which are compatible with the CMOS processes, offer an opportunity to circumvent these limitations to boost the device scalability and performance. Beyond applications in CMOS technology, the thus fabricated Si nanowire arrays can be explored as biosensors, providing a possible route to multiplexed label-free electronic chips for molecular diagnostics.

  9. Anticipating our future robot society: The evaluation of future robot applications from a user's perspective

    NARCIS (Netherlands)

    de Graaf, M.M.A.; Ben Allouch, Soumaya

    2016-01-01

    With an expected growth of robots in our future society, we believe that potential implications for robot applications should be addressed. Therefore, we conducted an online questionnaire among the general Dutch population (n= 1162) to map the societal impact of robots by identifying potential

  10. Design of a Dual-Band Bidirectional Antenna Using Superellipse-Monopole-Fed Rectangular Ring for IEEE 802.11 a/b/g/n Applications

    Directory of Open Access Journals (Sweden)

    Ekajit Khoomwong

    2016-01-01

    Full Text Available This paper presents the design of a dual-band bidirectional ring antenna fed by a superellipse surface probe for 2.4/5 GHz WLAN applications. The Method of Moments (MoM with RWG basis function was utilized in the study and design processes. A prototype antenna was fabricated successfully with the advantages of simple and low-cost structure. The measured impedance bandwidth of 810 MHz (2.10–2.91 GHz and 2.39 GHz (3.57–5.96 GHz is achieved for the first and second band, respectively. The peak gains are also feasible, 4.67 dBi at 2.45 GHz and 7.83 dBi at 5.5 GHz, with bidirectional radiation patterns for both bands. From the experimental field tests, the proposed antenna was suitable for most applications in long and narrow communication sites in 2.4/5 GHz bands as desired. Also, the measured and calculated results were in good agreement.

  11. Performance Analysis of the IEEE 802.11s PSM

    Directory of Open Access Journals (Sweden)

    Mirza Nazrul Alam

    2012-01-01

    Full Text Available With the introduction of IEEE 802.11 power save mode (PSM, a lot of work has been done to enhance the energy saving ability of the wireless nodes. The ultimate goal of the research is to make the networking equipment carbon neutral and prolong the lifetime of the energy limited device for various applications; in some cases it is a trade-off between energy efficiency and delay. However, few studies have been made until now in the area of IEEE 802.11s based link specific power mode. The essence of this method is the ability of a node to maintain different power modes with its different peer nodes at the same time. A new peer service period (PSP mechanism is also proposed in IEEE 802.11s amendment for transmitting to a receiver operating in PSM. In this paper the performance of the link specific power mode is studied for a single- and a multilink network in terms of energy, delay throughput, and sleep duration. It is found that at small load the energy saving could be as high as eighty percent when compared with the active mode operation. A stochastic model, based on discrete time discrete state Markov chain, is developed for one peer link operation to study the system behavior closely during PSM operation.

  12. Comparison of QoS guarantee techniques for VoIP over IEEE802.11 wireless LAN

    Science.gov (United States)

    Guo, Fanglu; Chiueh, Tzi-cker

    2008-01-01

    An emerging killer application for enterprise wireless LANs (WLANs) is voice over IP (VoIP) telephony, which promises to greatly improve the reachability and mobility of enterprise telephony service at low cost. None of the commercial IEEE 802.11 WLAN-based VoIP products can support more than ten G.729-quality voice conversations over a single IEEE 802.11b channel on real-world WLANs, even though the physical transmission rate is more than two orders of magnitude higher than an individual VoIP connection's bandwidth requirement. There are two main reasons why these VoIP systems' effective throughput is significantly lower than expected: VoIP's stringent latency requirement and substantial per-WLAN-packet overhead. Time-Division Multiple Access (TDMA) is a well-known technique that provides per-connection QoS guarantee as well as improves the radio channel utilization efficiency. This paper compares the effective throughput of IEEE 802.11, IEEE 802.11e and a software-based TDMA (STDMA) protocol that is specifically designed to support WLAN-based VoIP applications, on the same commodity IEEE 802.11 WLAN hardware. Empirical measurements from a VOIP over WLAN testbed show that the numbers of G.729-quality voice conversations that IEEE 802.11, IEEE 802.11e and STDMA can support over a single IEEE 802.11b channel are 18, 22 and 50, respectively.

  13. CERN receives prestigious Milestone recognition from IEEE

    CERN Multimedia

    2005-01-01

    The Nobel prize winner Georges Charpak and W. Cleon Anderson, IEEE President, unveil the Milestone bronze plaques. At a ceremony on 26 September at the Globe of Science and Innovation, Mr W. Cleon Anderson, President of the Institute of Electrical and Electronics Engineers (IEEE) formally dedicated Milestone plaques recognising the invention of electronic particle detectors at CERN. The plaque were unveiled by Mr Anderson and Georges Charpak, the Nobel-prize winning inventor of wire chamber technology at CERN in 1968. The IEEE is the world's largest professional association dedicated to the advancement of technology with 365,000 individual members in over 150 countries. Established in 1983, there are currently over 60 Milestones around the world. They honour momentous achievements in the history of electrical and electronics engineering, such as the landing of the first transatlantic cable, code breaking at Bletchley Park during World War II, and the development of the Japanese Bullet train, the Tokaido Shin...

  14. Notice of Violation of IEEE Publication Principles

    DEFF Research Database (Denmark)

    Memon, Nasrullah; Qureshi, Abdul Rasool; Wiil, Uffe Kock

    2009-01-01

    Notice of Violation of IEEE Publication Principles "Novel Algorithms for Subgroup Detection in Terrorist Networks" by Nasrullah Memon, Abdul Rasool Qureshi, Uffe Kock Wiil, and David L. Hicks in the Proceedings of the 2009 International Conference on Availability, Reliability and Security, March...... 2009, pp. 572-577 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles. This paper contains significant portions of original text from the papers cited below...... be made to the following articles: "Balancing Systematic and Flexible Exploration of Social Networks" by Adam Perer, Ben Shneiderman in the IEEE Transactions on Visualization and Computer Graphics, Vol. 12, No. 5 Sept/Oct 2006, pp. 693-700 "Mining for Offender Group Detection and Story of a Police...

  15. IEEE 1588 Clock Synchroniz ation in Distributed Systems%IEEE 1588时钟同步技术在分布式系统中的研究*

    Institute of Scientific and Technical Information of China (English)

    徐晓霞; 丁建功

    2014-01-01

    In order to realize high accuracy synchronous data acquisition and control in distributed system ,a distributed system clock synchronization method based on IEEE 1588 protocol is proposed .This paper analyzes the principle of master clock algorithm and the time synchronization process of local clock and master clock ,puts forward a IEEE 1588 realization scheme ,provides a hardware design method ,and elaborates the master‐slave clock software design process .On the basis of the work ,verifies the master‐slave clock synchronization .The experiments show that the method is feasible ,clock synchro‐nization precision can reach microsecond ,and may serve as a reference ,when the further application of IEEE 1588 in distrib‐uted industrial control systems is concerned .%为实现分布式系统高精度同步数据采集及实时控制,提出一种基于 IEEE 1588协议的分布式系统时钟同步方法。论文深入分析了IEEE 1588协议的算法原理和本地时钟同步主时钟的过程,提出了时间戳的IEEE 1588实现方案,提供了硬件设计方法,阐述了主从时钟的软件设计流程,在此基础上对主从时钟的同步进行了验证。实验证明:该方法是切实可行的,同步结果达到了10μs同步,为下一步将IEEE 1588大规模应用到分布式工业控制系统中起到了借鉴的作用。

  16. 23rd Workshop of the Italian Neural Networks Society (SIREN)

    CERN Document Server

    Esposito, Anna; Morabito, Francesco

    2014-01-01

    This volume collects a selection of contributions which has been presented at the 23rd Italian Workshop on Neural Networks, the yearly meeting of the Italian Society for Neural Networks (SIREN). The conference was held in Vietri sul Mare, Salerno, Italy during May 23-24, 2013. The annual meeting of SIREN is sponsored by International Neural Network Society (INNS), European Neural Network Society (ENNS) and IEEE Computational Intelligence Society (CIS). The book – as well as the workshop-  is organized in two main components, a special session and a group of regular sessions featuring different aspects and point of views of artificial neural networks, artificial and natural intelligence, as well as psychological and cognitive theories for modeling human behaviors and human machine interactions, including Information Communication applications of compelling interest.  .

  17. Editorial for IEEE Transactions on Power Electronics

    DEFF Research Database (Denmark)

    Blaabjerg, Frede

    2007-01-01

    Our IEEE transactions on power electronics has had some very positive progress these past years under the leadership of Dr. Daan van Wyk. Papers have been processed efficiently both in review time and publication time. This success has spread throughout the whole power electronics community which...

  18. Editorial for IEEE Transactions on Power Electronics

    DEFF Research Database (Denmark)

    Blaabjerg, Frede

    2007-01-01

    Our IEEE transactions on power electronics has had some very positive progress these past years under the leadership of Dr. Daan van Wyk. Papers have been processed efficiently both in review time and publication time. This success has spread throughout the whole power electronics community which...

  19. New model for selection of applicants at the universities in the conditions Smart-society

    Directory of Open Access Journals (Sweden)

    Alexandr S. Molchanov

    2017-01-01

    Full Text Available Smart-society -– a new quality of society. The greatest value to society will be represented by people trained by the new technologies or who require minimal resources to study up to the required level. Universities will use the smarteducational technology, that will require a new level of training the applicant and the other search engines, selection and motivation of applicants. The paper proposes a new model of selection of applicants to universities, which will improve the selection process of students, focusing on the management of individual educational routes learner, since elementary school.The main beneficiaries are the selection system are applicants, potential employer, educational organization. The main core of the system -– its own route management. System functionality includes:– monitoring of the environment (demography, economics, education;– work with targets;– analysis of the previous route and its correlation with the target;– control and fixing the trajectory of learning;– additional control and validation competencies as the demand for an employer or educational institution, and at the request of the trainees;– forecasting and calculation of several route options, with a choice for the student’s request.Taking into account the changes in society and the division of labor, as well as a set of really existing and planned information systems, we can conclude the feasibility of practical implementation of the proposed model. The development of such system of selection of applicants can contribute to:– earlier determining of the future profession with the involvement of employers and educational institutions;– early professional self-determination of applicants;– improve the quality of education at the expense of formation of additional motivation to learn;– possibility of operative management request to the construction or design of the educational program for the educational institution

  20. 15th IEEE International Conference on Intelligent Engineering Systems

    CERN Document Server

    Živčák, Jozef; Aspects of Computational Intelligence Theory and Applications

    2013-01-01

    This volume covers the state-of-the art of the research and development in various aspects of computational intelligence and gives some perspective directions of development. Except the traditional engineering areas that contain theoretical knowledge, applications, designs and projects, the book includes the area of use of computational intelligence in biomedical engineering. „Aspects of Computational Intelligence: Theory and Applications” is a compilation of carefully selected extended papers written on the basis of original contributions presented at the 15th IEEE International Conference on Intelligent Engineering Systems 2011, INES 2011 held at June 23.-26. 2011 in AquaCity Poprad, Slovakia.    

  1. Visualizing the application of GIS in transformation towards a sustainable development and a low carbon society

    Science.gov (United States)

    Ahmad, M. H.; Ariffin, A.; Malik, T. A.

    2014-02-01

    A strategy for sustainable development is a significant milestone on the road to a more socially, economically and environmentally responsible society. It creates a framework within which the stakeholders can make a strong contribution to a better future. Because of the merits and growing interest in sustainable development, the race is on for researchers and stakeholders in the construction sector to initiate actions to reduce the negative impacts of development and sharpen their competitive edge. The cities should be created with a vision which supports harmonious communities and living conditions through sustainable urban development. The resources must be used efficiently while reducing the development impact on human health and environment during the buildings' life cycle. Environmental auditing and pressure-state response based models to monitor sustainable development in Malaysia should be developed. A data availability and sharing system should be developed and implemented to facilitate for the use in the establishment of sustainable development and low carbon society. Ideas which affect millions of people and guide the policies of nations must be accessible to all. Only thus can they permeate the institutions from the local to the global level. Creating sustainable development and low carbon societies depends on the knowledge and involvement of all stakeholders in the industry. So what is our level of understanding of GIS and its application? The development of geospatial data in Malaysia is important because the successful implementation of sustainable development and low carbon projects depend largely on the availability of geospatial information. It would facilitate the stakeholders and resolve some of the problems regarding the availability, quality, organisation, accessibility and sharing of spatial information. The introduction of GIS may change the way for better sustainable urban development and low carbon society performance. The use of GIS is to

  2. Design of a 2 .4GHz CMOS Radio Transceiver for IEEE 802 .15 .4 (ZigBee) Standard Applications%一种适用于IEEE802.15.4(ZigBee)标准的2.4GHz CMOS射频收发机设计

    Institute of Scientific and Technical Information of China (English)

    李迪; 杨银堂; 石佐辰; 柳扬

    2015-01-01

    本文提出了一种适用于IEEE 802.15.4标准的2.4GHz免认证ISM频段的全集成CMOS射频收发机.接收机采用低中频结构以降低功耗、提高灵敏度,发射机则采用直接上变频结构以降低设计复杂度和功耗.芯片采用0.18μm 1P4M CMOS工艺以及MIM电容制造,供电电压1.8V .测试结果显示,在误包率为1%时,接收机灵敏度达到了-97dBm ,发射机输出至100Ω差分天线端口的最大输出功率为+3dBm .接收模式和发射模式下的电流功耗分别为17mA和19mA ,芯片面积3.3mm ×2.8mm .%A highly integrated CMOS transceiver was presented for 2 .4GHz unlicensed ISM (Industrial ,Scientific and Medi-cal ) band compatible to the IEEE 802 .15 .4 Standard .Low-IF topology was adopted in the receiver for low power consumption and high sensitivity while direct up-conversion in transmitter for low complexity .The transceiver chip has been fabricated in a 0 .18μm 1P4M CMOS (Complementary Metal Oxide Semiconductor ) technology with MIM (Metal-Insulator-Metal ) capacitors and supplied by a single 1 .8V .The experimental results show that the receiver achieves a sensitivity of -97dBm for PER(Packet Error Rate) of 1% and the transmitter provides a max power output of +3dBm into 100Ω differential antenna port .This transceiver dissipates 17mA in receive mode and 19mA in transmit mode and occupies an area of 3 .3mm × 2 .8mm .

  3. Throughput and delay analysis of IEEE 802.15.6-based CSMA/CA protocol.

    Science.gov (United States)

    Ullah, Sana; Chen, Min; Kwak, Kyung Sup

    2012-12-01

    The IEEE 802.15.6 is a new communication standard on Wireless Body Area Network (WBAN) that focuses on a variety of medical, Consumer Electronics (CE) and entertainment applications. In this paper, the throughput and delay performance of the IEEE 802.15.6 is presented. Numerical formulas are derived to determine the maximum throughput and minimum delay limits of the IEEE 802.15.6 for an ideal channel with no transmission errors. These limits are derived for different frequency bands and data rates. Our analysis is validated by extensive simulations using a custom C+ + simulator. Based on analytical and simulation results, useful conclusions are derived for network provisioning and packet size optimization for different applications.

  4. Design and Implementation of IEEE 802.15.4 Mac Protocol on FPGA

    CERN Document Server

    Bhat, Naagesh S

    2012-01-01

    The IEEE 802.15.4 is a wireless standard introduced for low power, low cost wireless communication with moderate data rates. In the next few years, it is expected that Low Rate Wireless Personal Area Networks (LR-WPAN) will be used in a wide variety of embedded applications, including home automation, industrial sensing and control, environmental monitoring and sensing. In these applications, numerous embedded devices running on batteries are distributed in an area communicating via wireless radios. This work presents a method which can be used for comparing current consumption of wireless data transfer embedded systems. This paper implements a small subset of the IEEE 802.15.4 protocol to achieve a point to point communication. The implemented protocol uses 802.15.4 MAC compliant data and acknowledgment packets. Current consumption is measured while doing one data packet transmission. Measurements are compared with existing work. IEEE 802.15.4 protocol implementation is done using Verilog language. Code impl...

  5. Rehabilitation Engineering & Assistive Technology Society (RESNA) position on the application of wheelchair standing devices: 2013 current state of the literature.

    Science.gov (United States)

    Dicianno, Brad E; Morgan, Amy; Lieberman, Jenny; Rosen, Lauren

    2016-01-01

    This article, approved by the Rehabilitation Engineering & Assistive Technology Society of North America Board of Directors on December 23, 2013, shares typical clinical applications and provides evidence from the literature supporting the use of wheelchair standers.

  6. Impact of IEEE 1609.4 channel switching on the IEEE 802.11p beaconing performance

    NARCIS (Netherlands)

    Eenennaam, van Martijn; Venis, van de Anne; Karagiannis, Georgios

    2012-01-01

    The IEEE 802.11p Wireless Access in Vehicular Environment (WAVE) protocol can only transmit packets on one channel. To support multi-channel operations, channel switching procedures have been proposed in IEEE 1609.4. This paper provides an analysis of the beaconing performance of IEEE 802.11p when t

  7. The New Standard IEEE 1599, Introduction and Examples

    Directory of Open Access Journals (Sweden)

    Denis L. Baggi

    2009-02-01

    Full Text Available IEEE 1599 is a new standard to encode music with XML symbols. It offers two important original characteristics compared to existing standards of the worlds of music, musicology and computer applications to this art and science. On one side, the encoding is in the form of symbols that can be read both by machines and humans. On the other, it allows the realization of applications in which all aspects of music, such as audio and sound, graphical representation, historical data, performance indications, represented thanks to the new concept of layers, are fully integrated, synchronized and can be accessed both individually and as parts of a whole. The article will give a brief description of the standard and of applications that have been built to show its power.

  8. Empirical Performance Evaluation of Enhanced Throughput Schemes of IEEE802.11 Technology in Wireless Area Networks

    Directory of Open Access Journals (Sweden)

    Femi-Jemilohun Oladunni.Juliet

    2013-08-01

    Full Text Available The success in the growing wireless standards can be measured by the achievement of quality of service(QoS specifications by the designers. The IEEE802.11 wireless standards are widely accepted as wirelesstechnology for wireless LAN. Efforts have been made over the years by the task group to provide adequatenumber of QoS enhancement schemes for the increasing numbers of multimedia applications. This paperexamines the empirical performances of ad hoc wireless networks deployed on IEEE802.11 standardvariants. A survey to some of the QoS schemes incorporated in IEEE802.11 wireless PHY layers werecarried out. Then the effects of this enhancement schemes in relation to data throughput and systemcapacity and reliability in the newest technology deployed on IEEE802.11ac standards was investigatedusing real time applications and simulation based approaches.

  9. Generalization of the proposed IEEE standard for floating-point arithmetic

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W.J.

    1982-12-10

    Several years ago the Microprocessor Standards Committee of the IEEE Computer Society established a Floating-Point Working Group to draft a standard binary floating-point arithmetic on 32-bit microprocessors. As that task neared completion, a second working group was established to generalize the proposed binary standard for other radices and wordlengths. We discuss the emerging generalization, its influence on final deliberations on the proposed binary standard, and the implications for numerical computation.

  10. Effective Bandwidth Utilization in IEEE802.11 for VOIP

    CERN Document Server

    Bhanu, S Vijay; Balakrishnan, V

    2010-01-01

    Voice over Internet protocol (VoIP) is one of the most important applications for the IEEE 802.11 wireless local area networks (WLANs). For network planners who are deploying VoIP over WLANs, one of the important issues is the VoIP capacity. VoIP bandwidth consumption over a WAN is one of the most important factors to consider when building a VoIP infrastructure. Failure to account for VoIP bandwidth requirements will severely limit the reliability of a VoIP system and place a huge burden on the WAN infrastructure. Less bandwidth utilization is the key reasons for reduced number of channel accesses in VOIP. But in the QoS point of view the free bandwidth of atleast 1-5% will improve the voice quality. This proposal utilizes the maximum bandwidth by leaving 1-5% free bandwidth. A Bandwidth Data rate Moderation (BDM) algorithm has been proposed which correlates the data rate specified in IEEE802.11b with the free bandwidth. At each time BDM will calculate the bandwidth utilization before sending the packet to i...

  11. GE networked mass storage solutions supporting IEEE network mass storage model

    Science.gov (United States)

    Herzog, Donald

    1993-01-01

    The General Electric Government Communications Systems Department (GE/GCSD) has developed a near real time digital data storage and retrieval system that extends the capabilities currently available in today's marketplace. This system called DuraStore uses commercially available rotary tape drive technology with ANSI/IEEE standards for automated magnetic tape based data storage. It uses a nonproprietary approach to satisfy a wide range of data rates and storage capabilities requirements and is compliant with the IEEE Network Storage Model. Rotary tape drives, standard interfaces, application specific hardware/software, networked automated tape libraries, library administrator, write protection, volume/physical media linkages, and maximum resource utilization are addressed.

  12. IEEE 802.15.4 transceiver for the 868/915 MHz band using Software Defined Radio

    OpenAIRE

    Zitouni, Rafik; Ataman, Stefan; Mathian, Marie; George, Laurent

    2013-01-01

    This paper reports an implementation of the PHY specifications of the IEEE 802.15.4 standard for the frequency band 868 915 MHz on a Software Defined Radio (SDR) platform. This standard is defined for low power, low data rate and low cost wireless networks. These specifications are used by the Zigbee technology for various applications such as home automation, industry monitoring or medical surveillance. Several hardware PHY 868/915 MHz band IEEE 802.15.4 transceiver implementations have been...

  13. Empirical Performance Evaluation of Enhanced Throughput Schemes of IEEE802.11 Technology in Wireless Area Networks

    OpenAIRE

    2013-01-01

    The success in the growing wireless standards can be measured by the achievement of quality of service (QoS) specifications by the designers. The IEEE802.11 wireless standards are widely accepted as wireless technology for wireless LAN. Efforts have been made over the years by the task group to provide adequate number of QoS enhancement schemes for the increasing numbers of multimedia applications. This paper examines the empirical performances of ad hoc wireless networks deployed on IEEE802....

  14. Design of handoff procedures for broadband wireless access IEEE 802.16 based networks

    Directory of Open Access Journals (Sweden)

    V. Rangel–Licea

    2008-01-01

    Full Text Available IEEE 802.16 is a protocol for fixed broad band wire less access that is currently trying to add mobility among mobile users in the standard. However, mobility adds some technical barriers that should be solved first, this is the case of HO "handoff" (change of connection between two base stations "BS" by a mobile user. In this paper, the problem of HO in IEEE 802.16 is approached try ing to maintain the quality of service (QoS of mobile users. A mechanism for changing connection during HO is pre sented. A simulation model based on OPNET MODELER1 was developed to evaluate the performance of the proposed HO mechanism. Finally, this paper demonstrates that it is possible to implement a seam less HO mech a nism over IEEE 802.16 even for users with de manding applications such as voice over IP.

  15. IEEE 1451.2 based Smart sensor system using ADuc847

    Science.gov (United States)

    Sreejithlal, A.; Ajith, Jose

    IEEE 1451 standard defines a standard interface for connecting transducers to microprocessor based data acquisition systems, instrumentation systems, control and field networks. Smart transducer interface module (STIM) acts as a unit which provides signal conditioning, digitization and data packet generation functions to the transducers connected to it. This paper describes the implementation of a microcontroller based smart transducer interface module based on IEEE 1451.2 standard. The module, implemented using ADuc847 microcontroller has 2 transducer channels and is programmed using Embedded C language. The Sensor system consists of a Network Controlled Application Processor (NCAP) module which controls the Smart transducer interface module (STIM) over an IEEE1451.2-RS232 bus. The NCAP module is implemented as a software module in C# language. The hardware details, control principles involved and the software implementation for the STIM are described in detail.

  16. A 1-GHz charge pump PLL frequency synthesizer for IEEE 1394b PHY

    DEFF Research Database (Denmark)

    Ji, J.; Liu, H.; Li, Q.

    2012-01-01

    This paper presents an implementation of multi-rate SerDes transceiver for IEEE 1394b applications. Simple and effective pre-emphasis and equalizer circuits are used at transmitter and receiver, respectively. A phase interpolator based clock and data recovery circuit with optimized linearity...... is also described. With an on-chip fully integrated phase locked loop, the transceiver works at data rates of 100Mb/s, 400Mb/s and 800Mb/s, supporting three different operating modes of S100b, S400b and S800b for IEEE 1394b. The chip has been fabricated using 0.13μm technology. The die area of transceiver...... is 2.9*1.6 mm including bonding pads and the total power dissipation is 284 mW with 1.2V and 3.3V supply voltages. © 2012 IEEE....

  17. [The QR code in society, economy and medicine--fields of application, options and chances].

    Science.gov (United States)

    Flaig, Benno; Parzeller, Markus

    2011-01-01

    2D codes like the QR Code ("Quick Response") are becoming more and more common in society and medicine. The application spectrum and benefits in medicine and other fields are described. 2D codes can be created free of charge on any computer with internet access without any previous knowledge. The codes can be easily used in publications, presentations, on business cards and posters. Editors choose between contact details, text or a hyperlink as information behind the code. At expert conferences, linkage by QR Code allows the audience to download presentations and posters quickly. The documents obtained can then be saved, printed, processed etc. Fast access to stored data in the internet makes it possible to integrate additional and explanatory multilingual videos into medical posters. In this context, a combination of different technologies (printed handout, QR Code and screen) may be reasonable.

  18. IEEE802.15.6 -based multi-accelerometer WBAN system for monitoring Parkinson's disease.

    Science.gov (United States)

    Keränen, Niina; Särestöniemi, Mariella; Partala, Juha; Hämäläinen, Matti; Reponen, Jarmo; Seppänen, Tapio; Iinatti, Jari; Jämsä, Timo

    2013-01-01

    In this paper we present a detailed example of a wireless body area network (WBAN) scenario utilizing the recent IEEE802.15.6 standard as applied to a multi-accelerometer system for monitoring Parkinson's disease and fall detection. Ultra wideband physical layer and standard security protocols are applied to meet application requirements for data rate and security.

  19. Research of time synchronization technology based on IEEE 1588v2 in optical communication network%基于IEEE1588v2协议的光网络时间同步技术研究

    Institute of Scientific and Technical Information of China (English)

    李恩; 刘志强; 敬玉乡; 丁明吉

    2011-01-01

    分析了现有光网络中时间同步实现方法的不足,阐述了IEEE 1588v2协议的基本原理,提出了IEEE 1588v2协议在光通信网络中实现时间同步的方法,指出精确时间同步协议在光网络中的应用前景和发展方向.%This paper analyses the disadvantage of time synchronization in the optical communication network, and illustrated the fundamental principle of IEEE 1588v2 protocol, the synchronization method about IEEE 1588v2 protocol in optical communication network time was proposed. Finally,it showed the application and development direction of precision time synchronization protocol in optical communication network.

  20. Analyzing the Engineering Educational Research in Spain: A Global Vision through the Awards of CESEI-IEEE

    Science.gov (United States)

    Plaza, I.; Arcega, F.; Castro, M.; Llamas, M.

    2011-01-01

    CESEI is the acronym of the Spanish Chapter of the Education Society of IEEE (the Institute of Electric and Electronics Engineers). Every year, the CESEI awards a prize for the best doctoral thesis and FDP (final (master) degree projects) about education. The thesis or the project must be developed in the areas of electrical engineering,…

  1. The Applicability of Western Socio-Legal Frameworks to the Study of Negotiation in Chinese Society

    Science.gov (United States)

    Chung, Mona; Ingleby, Richard

    2011-01-01

    Theoretical frameworks for the examination of negotiation generated by Western academics do not easily translate to Chinese society because of fundamental differences between Western and Chinese society. Attempts to study negotiation in Chinese society and to improve negotiation between Chinese and Western business people are themselves…

  2. Specialty Engineering Supplement to IEEE-15288.1

    Science.gov (United States)

    2015-05-15

    MISSILE SYSTEMS CENTER TAILORING SPECIALTY ENGINEERING SUPPLEMENT TO IEEE -15288.1 APPROVED FOR PUBLIC RELEASE; DISTRIBUTION...IS UNLIMITED 1 Tailoring of IEEE 15288.1: Specialty Engineering Supplement. 1. Intent of this Tailoring Document This tailoring document is...historically deemed valuable to mission assurance/success of high-reliability space systems. This tailoring document supplements IEEE 15288.1-2015 Annex E

  3. IEEE 802.16J-Relay Fortified Aeromacs Networks; Benefits and Challenges

    Science.gov (United States)

    Kamali, Behnam; Apaza, Rafael D.

    2014-01-01

    Aeronautical Mobile Airport Communications System (AeroMACS) is an IEEE 802.16 standard-based (WiMAX) broadband aviation transmission technology, developed to provide safety critical communications coverage for airport surface in support of fixed and mobile ground to ground applications and services. We have previously demonstrated that IEEE 802.16j-amendment-based WiMAX is most feasible for AeroMACS applications. The principal argument in favor of application of IEEE 802.16j technology is the flexible and cost effective extension of radio coverage that is afforded by relay fortified WiMAX networks, with virtually no increase in the power requirements. In this article, following introductory remarks on airport surface communications, WiMAX and AeroMACS; the IEEE 802.16j-based WiMAX technology and multihop relay systems are briefly described. The two modes of relay operation supported by IEEE 802.16j amendment; i.e., transparent (TRS) and non-transparent (NTRS) modes, are discussed in some detail. Advantages and disadvantages of using TRS and NTRS in AeroMACS networks are summarized in a table. Practical issues vis--vis the inclusion of relays in AeroMACS networks are addressed. It is argued that the selection of relay type may affect a number of network parameters. A discussion on specific benefits and challenges of inclusion of relays in AeroMACS networks is provided. The article concludes that in case it is desired or necessary to exclusively employ one type of relay mode for all applications throughout an AeroMACS network, the proper selection would be the non-transparent mode.

  4. A versatile trigger and synchronization module with IEEE1588 capabilities and EPICS support

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, J.M., E-mail: juanmanuel.lopez@upm.e [Grupo de Investigacion en Instrumentacion y Acustica Aplicada, Universidad Politecnica de Madrid, Crta. Valencia Km-7, Madrid 28031 (Spain); Ruiz, M.; Borrego, J.; Arcas, G. de; Barrera, E. [Grupo de Investigacion en Instrumentacion y Acustica Aplicada, Universidad Politecnica de Madrid, Crta. Valencia Km-7, Madrid 28031 (Spain); Vega, J. [Asociacion EURATOM/CIEMAT para Fusion, Madrid (Spain)

    2010-07-15

    Event timing and synchronization are two key aspects to improve in the implementation of distributed data acquisition (dDAQ) systems such as the ones used in fusion experiments. It is also of great importance the integration of dDAQ in control and measurement networks. This paper analyzes the applicability of the IEEE1588 and EPICS standards to solve these problems, and presents a hardware module implementation based in both of them that allow adding these functionalities to any DAQ. The IEEE1588 standard facilitates the integration of event timing and synchronization mechanisms in distributed data acquisition systems based on IEEE 803.3 (Ethernet). An optimal implementation of such system requires the use of network interface devices which include specific hardware resources devoted to the IEE1588 functionalities. Unfortunately, this is not the approach followed in most of the large number of applications available nowadays. Therefore, most solutions are based in software and use standard hardware network interfaces. This paper presents the development of a hardware module (GI2E) with IEEE1588 capabilities which includes USB, RS232, RS485 and CAN interfaces. This permits to integrate any DAQ element that uses these interfaces in dDAQ systems in an efficient and simple way. The module has been developed with Motorola's Coldfire MCF5234 processor and National Semiconductors's PHY DP83640T, providing it with the possibility to implement the PTP protocol of IEEE1588 by hardware, and therefore increasing its performance over other implementations based in software. To facilitate the integration of the dDAQ system in control and measurement networks the module includes a basic Input/Output Controller (IOC) functionality of the Experimental Physics and Industrial Control System (EPICS) architecture. The paper discusses the implementation details of this module and presents its applications in advanced dDAQ applications in the fusion community.

  5. Evaluation of H.264/AVC over IEEE 802.11p vehicular networks

    Science.gov (United States)

    Rozas-Ramallal, Ismael; Fernández-Caramés, Tiago M.; Dapena, Adriana; García-Naya, José Antonio

    2013-12-01

    The capacity of vehicular networks to offer non-safety services, like infotainment applications or the exchange of multimedia information between vehicles, have attracted a great deal of attention to the field of Intelligent Transport Systems (ITS). In particular, in this article we focus our attention on IEEE 802.11p which defines enhancements to IEEE 802.11 required to support ITS applications. We present an FPGA-based testbed developed to evaluate H.264/AVC (Advanced Video Coding) video transmission over vehicular networks. The testbed covers some of the most common situations in vehicle-to-vehicle and roadside-to-vehicle communications and it is highly flexible, allowing the performance evaluation of different vehicular standard configurations. We also show several experimental results to illustrate the quality obtained when H.264/AVC encoded video is transmitted over IEEE 802.11p networks. The quality is measured considering two important parameters: the percentage of recovered group of pictures and the frame quality. In order to improve performance, we propose to substitute the convolutional channel encoder used in IEEE 802.11p for a low-density parity-check code encoder. In addition, we suggest a simple strategy to decide the optimum number of iterations needed to decode each packet received.

  6. Performance Evaluations for IEEE 802.15.4-based IoT Smart Home Solution

    Directory of Open Access Journals (Sweden)

    Nga Dinh

    2016-09-01

    Full Text Available The Internet of Things (IoT is going to be a market-changing force for a variety of real-time applications such as e-healthcare, home automation, environmental monitoring, and industrial automation. Low power wireless communication protocols offering long lifetime and high reliability such as the IEEE 802.15.4 standard have been a key enabling technology for IoT deployments and are deployed for home automation recently. The issues of the IEEE 802.15.4 networks have moved from theory to real world deployments. The work presented herein intends to demonstrate the use of the IEEE 802.15.4 standard in recent IoT commercial products for smart home applications: the Smart Home Starter Kit. The contributions of the paper are twofold. First, the paper presents how the IEEE 802.15.4 standard is employed in Smart Home Starter Kit. In particular, network topology, network operations, and data transfer mode are investigated. Second, network performance metrics such as end-to-end (E2E delay and frame reception ratio (FRR are evaluated by experiments. In addition, the paper discusses several directions for future improvements of home automation commercial products.

  7. Adaptability of IEEE 802.15.4(Zigbee Protocol for Wireless Sensor network

    Directory of Open Access Journals (Sweden)

    Lalit Saraswat

    2010-05-01

    Full Text Available The IEEE 802.15.4/Zigbee protocol stack has been considered as a promising technology for Wireless Sensor Networks (WSN. IEEE 802.15.4 Low-Rate Wireless Personal Area Network (WPAN standardspecifies the lower protocol layers—the physical layer (PHY, and the media access control (MAC portion of the data link layer (DLL and Network layer(NWK Wireless sensor network provide the low rate, wireless interconnection of ultra low cost sensor/actuator devices to enable the cyber world to sense and affect the real physical environment. The IEEE 802.15.4/Zigbee protocol stack provide selectable levels of security using AES-128 mechanism for privacy, sender authentication, message integrity. It uses fully handshake protocol for transfer reliability. In business applications where WSN are applied, failures in essential parts of the sensor network must beefficiently detected and automatically recovered. ZigBee is targeted at radio-frequency (RF applications that require a low data rate, long battery life, and secure networking.This paper will analyze theadaptability features of IEEE802.15.4[3] at Physical, MAC and Network layer and various mode of operation at MAC layer.

  8. Experimental study of IEEE 802.15.4 anti-interference ability to WLAN%IEEE802.15.4对WLAN抗干扰性能的实验研究

    Institute of Scientific and Technical Information of China (English)

    王赟; 乐燕芬; 施伟斌

    2012-01-01

    针对2.4 GHz频段内的IEEE 802.15.4,研究其与无线局域网共存时的抗干扰性.实验设定了多种场景并测试了实际应用环境中IEEE 802.15.4的通信质量.实验数据表明,WLAN干扰可使IEEE 802.15.4数据丢包率高达94%.通过实验数据分析得到了IEEE 802.15.4通信节点丢包率与WLAN信道、节点发送功率以及RSSI的相关性,为研究WSN的同频抗干扰技术提供了有价值的实验依据.%An experimental study of IEEE 802.15.4 anti-interference ability when it is coexistent with Wireless Local Area Networks in 2.4 GHz band is carried out. Communication quality of IEEE 802.15.4 is tested in a variety of scenarios and in practical application environment. Packet loss rate of IEEE 802.15.4 reaches as high as 94% due to the interference of WLAN as showed by the experimental data. This paper analyses correlation of packet loss rate of IEEE 802.15.4 communication nodes with WLAN channel, output power of nodes and RSSI and it provides a valuable experimental basis for the study of frequency anti-interference of WSN technology.

  9. IEEE北京分会召开IEEE Fellow座谈会并举力IEEE Fellow讲坐

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ 2006年8月29日下午,IEEE北京分会(Beijing Section),在中国科学院自动化研究所召开IEEE Fellow座谈会.座谈会的主要议题是如何发挥我国IEEE Fellow的作用.会议由IEEE北京分会现任主席谭铁牛博士(自动化研究所所长,IEEE Fellow)主持,他向到会的IEEE Fellow,介绍了IEEE北京分会2006-2007年度的工作计划设想.

  10. Application of Innovative Models in Teaching Methods for Introduction to Nature and Society and Students’ Success

    OpenAIRE

    Snezana Stavreva Veselinovska; Snezana Kirova

    2014-01-01

    This paper deals with the issue of shaping and applying innovative models in the teaching of Teaching methods for introduction to nature and society in the conditions existing in our schools. Most teachers need a modern methodical transformation of program contents for teaching nature and society. Therefore the theoretical part of the work is directed towards the consideration of innovative approaches in Teaching methods for introduction to nature and society, which asked for an indication of...

  11. Proteomics application exercise of the Swiss Proteomics Society: report of the SPS'02 session.

    Science.gov (United States)

    Binz, Pierre-Alain; Abdi, Fadi; Affolter, Michael; Allard, Laure; Barblan, Jachen; Bhardwaj, Sanjeev; Bienvenut, Willy V; Bulet, Philippe; Burgess, Jennifer; Carrette, Odile; Corthals, Garry; Delalande, François; Diemer, Hélène; Favreau, Philippe; Giuliano, Elia; Gueguen, Yannick; Guillaume, Elisabeth; Hahner, Stephanie; Man, Petr; Michalet, Sophie; Neri, Dario; Noukakis, Dimitrios; Palagi, Patricia; Paroutaud, Pierre; Pimenta, Daniel Carvalho; Quadroni, Manfredo; Resemann, Anja; Richert, Sophie; Rybak, Jascha; Sanchez, Jean-Charles; Scherl, Alexander; Scheurer, Simone; Schweiger Hufnagel, Ulrike; Siethoff, Christoph; Suckau, Detlev; van Dorsselaer, Alain; Wagner Redeker, Winfried; Walter, Nadia; Stöcklin, Reto

    2003-08-01

    After the success of the mass spectrometry (MS) round table that was held at the first Swiss Proteomics Society congress (SPS'01) in Geneva, the SPS has organized a proteomics application exercise and allocated a full session at the SPS'02 congress. The main objective was to encourage the exchange of expertise in protein identification, with a focus on the use of mass spectrometry, and to create a bridge between the users' questions and the instrument providers' solutions. Two samples were sent to fifteen interested labs, including academic groups and MS hardware providers. Participants were asked to identify and partially characterize the samples. They consisted of a complex mixture of peptide/proteins (sample A) and an almost pure recombinant peptide carrying post-translational modifications (sample B). Sample A was an extract of snake venom from the species Bothrops jararaca. Sample B was a recombinant and modified peptide derived from the shrimp Penaeus vannamei penaeidin 3a. The eight labs that returned results reported the use of a wide range of MS instrumentation and techniques. They mentioned a variety of time and manpower allocations. The origin of sample A was generally identified together with a number of database protein entries. The difficulty of the sample identification lay in the incomplete knowledge of the Bothrops species genome sequence and is discussed. Sample B was generally and correctly identified as penaeidin. However, only one group reported the full primary structure. Interestingly, the approaches were again varied and are discussed in the text.

  12. A nomadic access mechanism for enabling dynamic video surveillance over IEEE 802.15.4 networks

    Science.gov (United States)

    Garcia-Sanchez, Felipe; Garcia-Sanchez, Antonio-Javier; Losilla, Fernando; Garcia-Haro, Joan

    2010-12-01

    IEEE 802.15.4 networking technology is designed to be the common standard for integrating WSN applications in heterogeneous environments. However, applications considering mobile nodes along with strict temporal requirements, such as those required for video transmission, are an unexplored field for this technology. These applications involve different challenges and issues that the direct employment of the IEEE 802.15.4 standard does not resolve. Therefore, in this paper a cross-layer mechanism consisting of application and medium access arbitration is presented, enabling the efficient connection and operation of mobile nodes together with the transmission of video flows. The proposed mechanism is evaluated via simulation and its feasibility checked by means of a first prototype. The study of power consumption is also taken into account and so are the quality of service parameters and the human quality perception of the received video stream. The results obtained are presented and further discussed.

  13. IEEE 802.11 ECG monitoring system.

    Science.gov (United States)

    Tejero-Calado, Juan; Lopez-Casado, Carmen; Bernal-Martin, Antonio; Lopez-Gomez, Miguel; Romero-Romero, Marco; Quesada, Guillermo; Lorca, Julio; Rivas, Ramon

    2005-01-01

    New wireless technologies make possible the implementation of high level integration wireless devices which allow the replacement of traditional large wired monitoring devices. This kind of devices favours at-home hospitalization, reducing the affluence to sanitary assistance centers to make routine controls. This fact causes a really favourable social impact, especially for elder people, rural-zone inhabitant, chronic patients and handicapped people. Furthermore, it offers new functionalities to physicians and will reduce the sanitary cost. Among these functionalities, biomedical signals can be sent to other devices (screen, PDA, PC...) or processing centers, without restricting the patients' mobility. The aim of this project is the development and implementation of a reduced size multi-channel electrocardiograph based on IEEE 802.11, which allows wireless monitoring of patients, and the insertion of the information into the TCP/IP Hospital network.

  14. 7th IEEE International Conference Intelligent Systems

    CERN Document Server

    Atanassov, KT; Doukovska, L; Hadjiski, M; Jotsov, V; Kacprzyk, J; Kasabov, N; Sotirov, S; Szmidt, E; Zadrożny, S; Filev, D; Jabłkowski, J; Kacprzyk, J; Krawczak, M; Popchev, I; Rutkowski, L; Sgurev, V; Sotirova, E; Szynkarczyk, P

    2015-01-01

    This two volume set of books constitutes the proceedings of the 2014  7th IEEE International Conference Intelligent Systems (IS), or IEEE IS’2014 for short, held on September 24‐26, 2014 in Warsaw, Poland. Moreover, it contains some selected papers from the collocated IWIFSGN'2014-Thirteenth International Workshop on Intuitionistic Fuzzy Sets and Generalized Nets.The conference was organized by the Systems Research Institute, Polish Academy of Sciences, Department IV of Engineering Sciences, Polish Academy of Sciences, and Industrial Institute of Automation and Measurements - PIAP.The papers included in the two proceedings volumes have been subject to a thorough review process by three highly qualified peer reviewers.Comments and suggestions from them have considerable helped improve the quality of the papers but also the division of the volumes into parts, and assignment of the papers to the best suited parts.  

  15. 2012 IEEE Vehicular Networking Conference (VNC): Demo Summaries

    NARCIS (Netherlands)

    Altintas, Onur; Chen, Wai; Heijenk, Geert; Oh, Hyun Seo; Chung, Jong-Moon; Dressler, Falko; Kargl, Frank; Pau, Giovanni; Schoch, Elmar

    2012-01-01

    Preface Last year’s edition of IEEE VNC in Amsterdam included a very successful demonstration session in its program. Therefore, demonstrations are again part of the program of IEEE VNC 2012 in Seoul, Republic of Korea. Demonstrations play an important role to expose the research community to practi

  16. IEEE Standard Dictionary of Electrical and Electronics Terms.

    Science.gov (United States)

    Institute of Electrical and Electronics Engineers, Inc., New York, NY.

    This dictionary, prepared by the Institute of Electrical and Electronics Engineers, Inc. (IEEE), defines 13,000 technical words from every area of electrical and electronics engineering. The dictionary contains hundreds of new terms as well as revisions of earlier ones. Each definition is an official standard of IEEE. The definitions are arranged…

  17. IEEE Standard Dictionary of Electrical and Electronics Terms.

    Science.gov (United States)

    Institute of Electrical and Electronics Engineers, Inc., New York, NY.

    This dictionary, prepared by the Institute of Electrical and Electronics Engineers, Inc. (IEEE), defines 13,000 technical words from every area of electrical and electronics engineering. The dictionary contains hundreds of new terms as well as revisions of earlier ones. Each definition is an official standard of IEEE. The definitions are arranged…

  18. Strategies for Optimal MAC Parameters Tuning in IEEE 802.15.6 Wearable Wireless Sensor Networks.

    Science.gov (United States)

    Alam, Muhammad Mahtab; Ben Hamida, Elyes

    2015-09-01

    Wireless body area networks (WBAN) has penetrated immensely in revolutionizing the classical heath-care system. Recently, number of WBAN applications has emerged which introduce potential limits to existing solutions. In particular, IEEE 802.15.6 standard has provided great flexibility, provisions and capabilities to deal emerging applications. In this paper, we investigate the application-specific throughput analysis by fine-tuning the physical (PHY) and medium access control (MAC) parameters of the IEEE 802.15.6 standard. Based on PHY characterizations in narrow band, at the MAC layer, carrier sense multiple access collision avoidance (CSMA/CA) and scheduled access protocols are extensively analyzed. It is concluded that, IEEE 802.15.6 standard can satisfy most of the WBANs applications throughput requirements by maximum achieving 680 Kbps. However, those emerging applications which require high quality audio or video transmissions, standard is not able to meet their constraints. Moreover, delay, energy efficiency and successful packet reception are considered as key performance metrics for comparing the MAC protocols. CSMA/CA protocol provides the best results to meet the delay constraints of medical and non-medical WBAN applications. Whereas, the scheduled access approach, performs very well both in energy efficiency and packet reception ratio.

  19. Performance comparison of IEEE 802.11g and IEEE 802.11n in the presence of interference from 802.15.4 networks

    OpenAIRE

    Masood, Syed Haani

    2013-01-01

    In this paper we compare the packet error rate (PER) and maximum throughput of IEEE 802.11n and IEEE 802.11g under interference from IEEE 802.15.4 by using MATLAB to simulate the IEEE PHY for 802.11n and 802.11g networks.

  20. Performance comparison of IEEE 802.11g and IEEE 802.11n in the presence of interference from 802.15.4 networks

    OpenAIRE

    Masood, Syed Haani

    2013-01-01

    In this paper we compare the packet error rate (PER) and maximum throughput of IEEE 802.11n and IEEE 802.11g under interference from IEEE 802.15.4 by using MATLAB to simulate the IEEE PHY for 802.11n and 802.11g networks.

  1. A versatile trigger and synchronization module with IEEE1588 capabilities and Epics support

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, J.M.; Ruiz, M.; Borrego, J.; Arcas, G. de; Barrera, E. [Universidad Politecnica de Madrid, Grupo de Investigacion en Instrumentacion y Acustica Aplicada, Madrid (Spain); Vega, J. [Asociacion EURATOM/CIEMAT para Fusion. Madrid (Spain)

    2009-07-01

    Event timing and synchronization are two key aspects to improve the implementation of distributed data acquisition (dDAQ) systems such as the ones used in fusion experiments. It is very important to integrate dDAQ in control and measurement networks. This poster analyzes the applicability of the IEEE 1588 and EPICS standards to solve these problems, and presents a hardware module implementation based in both of them that allow adding these functionalities to any DAQ. The IEEE1588 standard facilitates the integration of event timing and synchronization mechanisms in distributed data acquisition systems based on IEEE 803.3 (Ethernet). An optimal implementation of such system requires the use of network interface devices which include specific hardware resources devoted to the IEE1588 functionalities. Unfortunately, this is not the approach followed in most of the large number of applications available nowadays. Therefore, most solutions are based in software and use standard hardware network interfaces. This paper presents the development of a hardware module (GI2E) with IEEE 1588 capabilities which includes USB, RS232, RS485 and CAN interfaces. This permits the integration of any DAQ element that uses these interfaces in dDAQ systems in an efficient and simple way. The module has been developed with Motorola's Coldfire MCF5234 processor and National Semiconductors's PHY DP83640T, providing it with the possibility to implement the PTP protocol of IEEE 1588 by hardware, and therefore increasing its performance over other implementations based in software. To facilitate the integration of the dDAQ system in control and measurement networks the module includes a basic IOC (Input Output Controller) functionality of the EPICS (Experimental Physics and Industrial Control System) architecture. This document is a poster. (authors)

  2. IEEE 802.11 Wireless LANs: Performance Analysis and Protocol Refinement

    Directory of Open Access Journals (Sweden)

    Chatzimisios P.

    2005-01-01

    Full Text Available The IEEE 802.11 protocol is emerging as a widely used standard and has become the most mature technology for wireless local area networks (WLANs. In this paper, we focus on the tuning of the IEEE 802.11 protocol parameters taking into consideration, in addition to throughput efficiency, performance metrics such as the average packet delay, the probability of a packet being discarded when it reaches the maximum retransmission limit, the average time to drop a packet, and the packet interarrival time. We present an analysis, which has been validated by simulation that is based on a Markov chain model commonly used in the literature. We further study the improvement on these performance metrics by employing suitable protocol parameters according to the specific communication needs of the IEEE 802.11 protocol for both basic access and RTS/CTS access schemes. We show that the use of a higher initial contention window size does not considerably degrade performance in small networks and performs significantly better in any other scenario. Moreover, we conclude that the combination of a lower maximum contention window size and a higher retry limit considerably improves performance. Results indicate that the appropriate adjustment of the protocol parameters enhances performance and improves the services that the IEEE 802.11 protocol provides to various communication applications.

  3. Active Channel Reservation for Coexistence Mechanism (ACROS) for IEEE 802.15.4 and IEEE 802.11

    Science.gov (United States)

    Shin, Soo Young; Woo, Dong Hyuk; Lee, Jong Wook; Park, Hong Seong; Kwon, Wook Hyun

    In this paper, a coexistence mechanism between IEEE 802.15.4 and IEEE 802.11b, Active Channel Reservation for cOexiStence (ACROS), is proposed. The key idea underlining ACROS is to reserve the channel for IEEE 802.15.4 transmission, where IEEE 802.11 transmissions are forbidden. The request-to-send (RTS)/clear-to send (CTS) mechanism within IEEE 802.11 is used to reserve a channel. The proposed ACROS mechanism is implemented into a PC based prototype. The embedded version of ACROS is also developed to mitigate the timing drift problem in the PC-based ACROS. The efficiency of ACROS is shown using the throughput and packet error rate achieved in actual experiments.

  4. Application of Innovative Models in Teaching Methods For Nature and Society Studies and Students' Success

    OpenAIRE

    Stavreva Veselinovska, Snezana; Koleva Gudeva, Liljana

    2011-01-01

    This paper deals with the issue of shaping and applying innovative models in the teaching subject Teaching methods for nature and society studies in the conditions existing in our schools. Most teachers show the need for a modern methodical transformation of program contents for teaching nature and society studies and the display of models of educational organization of classes. Therefore the theoretical part of the work is directed toward consideration of innovative approaches in Teaching me...

  5. 基于IEEE1588的变电站过程层采样值同步技术研究%Analysis of sample value synchronization in process level based on IEEE 1588

    Institute of Scientific and Technical Information of China (English)

    陈宏辉; 蔡泽祥; 王海柱

    2012-01-01

    为了提高变电站过程层网络采样值的同步精度,详细分析了基于IEEE 1588精确同步协议的变电站过程层采样值同步技术的原理与实现方式.分析对比了瞬时值差动与矢量差动的采样精度,研究了同步误差对差动保护采样值精度的影响;通过分析IEEE 1588协议同步的实现过程,并与毫秒级别对时协议NTP进行对比,指出了IEEE 1588实现所涉及到的关键技术.通过分析基于IEEE 1588过程层采样值同步在实际工程应用中的实现方式,论证了IEEE 1588协议的采样精度达到亚微秒级别,能够有效减小多端同步采样的精度,对于变电站安全稳定运行具有十分重要的意义.%To improve the synchronous accuracy of network sampling values of process level, this paper analyzes the principle and realization way of sample value synchronization in process level based on IEEE 1588 in detail. First, the instantaneous value sampling precision and vector sampling precision are compared and influence of synchronization errors on sample value precision is analyzed. Then, synchronization of IEEE 1588 is expatiated by comparing with NTP of which synchronization precision is in millisecond level and essential parts of IEEE 1588 are studied. Last, realization of sample value synchronization in process level in engineering application based on IEEE 1588 is introduced, which proves that IEEE 1588 protocol can achieve sub-microsecond level of sampling accuracy and effectively reduce the multiport synchronous sampling accuracy, which is very significant for the security and stability of the substation.

  6. Attacks on IEEE 802.11 wireless networks

    Directory of Open Access Journals (Sweden)

    Dejan Milan Tepšić

    2013-06-01

    networking it has never been easier to penetrate the network. One of the biggest problems of today's wireless networks is the lack of effective systems for intrusion detection. Forgetting to cover gaps in wireless network security may result in intrusion into the network by an attacker. Security in IEEE 802.11 wireless networks Although the IEEE 802.11 protocol defines security standards, wireless networks are one of the weakest links in the chain of computer networks. The basic security requirements of each computer network are reliable user authentication, privacy protection and user authentication. Security attacks on IEEE 802.11 wireless networks Non-technical attacks include a variety of human weaknesses, such as lack of conscience, negligence or over-confidence towards the strangers. Network attacks include a number of techniques that enable attackers to penetrate into  the wireless network, or at least to disable it. Apart from the security problems with the IEEE 802.11 protocol, there are vulnerabilities in operating systems and applications on wireless clients. The methodology of attack Before testing wireless network security vulnerabilities, it is important to define a formal testing methodology. The first step before the actual attack is footprinting. The second step is the creation of a network map that shows how the wireless system looks. For this purpose, hackers are using specific tools, such as Network Stumbler, Nmap and Fping. When basic information about the wireless network is gathered, more information can be found out through the process of system scanning (enumeration. Attacks on IEEE 802.11 wireless networks Social engineering is a technique by which attackers exploit the natural trust of most people. Radio waves do not respect defined boundaries. If radio waves are broadcasted outside of the boundaries of the defined area, then it is necessary to reduce signal strength on wireless access points. In that way, radio waves travel over shorter distances

  7. IEEE 802.11 DCF协议性能分析模型%Performance Analysis Model for IEEE 802.11 Distributed Coordination Function Protocol

    Institute of Scientific and Technical Information of China (English)

    钟萍; 施海彬; 庄玉祥; 石江宏; 陈辉煌

    2013-01-01

    提出了一种改进的二维Markov链模型用于分析IEEE 802.11 DCF协议.该模型不仅考虑实际应用中饱和业务量和非饱和业务量的情况,而且考虑DCF协议的退避计时器的冻结状态和有限的重传次数.通过对该Markov链模型稳定状态的求解并结合M/M/1/K排队模型,导出了DCF系统性能的理论模型.仿真结果表明,该理论模型能够精确地预测广义IEEE 802.11 DCF协议的系统性能.%This paper proposes an improved two-dimensional Markov chain model for the performance analysis of the IEEE 802.11 DCF protocol. The model is applicable to both saturated and unsaturated traffic conditions. Moreover, it extends the existing models to take into account previously-ignored MAC layer factors such as backoff freezing and limited times of retry. In addition, by deriving the stationary state of the Markov model and considering an M/M/1/K queuing model, we further derive a theoretical model for evaluating performance of the general IEEE 802.11 DCF protocols. Accuracy of the proposed theoretical model is validated with simulation results.

  8. A distributed scheme to manage the dynamic coexistence of IEEE 802.15.4-based health-monitoring WBANs.

    Science.gov (United States)

    Deylami, Mohammad N; Jovanov, Emil

    2014-01-01

    The overlap of transmission ranges between wireless networks as a result of mobility is referred to as dynamic coexistence. The interference caused by coexistence may significantly affect the performance of wireless body area networks (WBANs) where reliability is particularly critical for health monitoring applications. In this paper, we analytically study the effects of dynamic coexistence on the operation of IEEE 802.15.4-based health monitoring WBANs. The current IEEE 802.15.4 standard lacks mechanisms for effectively managing the coexistence of mobile WBANs. Considering the specific characteristics and requirements of health monitoring WBANs, we propose the dynamic coexistence management (DCM) mechanism to make IEEE 802.15.4-based WBANs able to detect and mitigate the harmful effects of coexistence. We assess the effectiveness of this scheme using extensive OPNET simulations. Our results indicate that DCM improves the successful transmission rates of dynamically coexisting WBANs by 20%-25% for typical medical monitoring applications.

  9. IEEE 802.15.4: a Federating Communication Protocol for Time-Sensitive Wireless Sensor Networks

    OpenAIRE

    Koubâa, Anis; Alves, Mário; Tovar, Eduardo

    2006-01-01

    Wireless Sensor Networks (WSNs) have been attracting increasing interests for developing a new generation of embedded systems with great potential for many applications such as surveillance, environment monitoring, emergency medical response and home automation. However, the communication paradigms in WSNs differ from the ones attributed to traditional wireless networks, triggering the need for new communication protocols. In this context, the recently standardised IEEE 802.15....

  10. The Impact of Dynamic RTS Threshold Adjustment for IEEE 802.11 MAC Protocol

    OpenAIRE

    Mostafa Mjidi; Debasish Chakraborty; Naoki Nakamura; Norio Shiratori

    2009-01-01

    In recent years, wireless technologies and application received great attention. The Medium Access Control (MAC) protocol is the main element that determines the efficiency in sharing the limited communication bandwidth of the wireless channel in wireless local area networks (WLANs). IEEE 802.11 introduced the optional RTS/CTS handshaking mechanism to address the hidden terminal problem as well as to reduces the chance of collision in case of higher node density and traffic. RTS Threshold (RT...

  11. American Headache Society

    Science.gov (United States)

    ... Applications are now being accepted for the 2017 International headache Society scheduled for January 20 - 22, 2017 at the ... READ MORE Sep 7 18th Congress of the International Headache Society Vancouver, BC Canada , Vancouver Convention Centre READ MORE ...

  12. Proposal of an ISO/IEEE11073 platform for healthcare telemonitoring: plug-and-play solution with new use cases

    OpenAIRE

    M. Galarraga; Martínez, I; Serrano, L.; Toledo,Paula; Escayola, J.; Fernández, Julián; Jiménez-Fernández, S.; Led, S.; Martínez-Espronceda, M.; Viruete, E.; García, José

    2007-01-01

    Proceeding of: 29th Annual International Conference of IEEE Engineering in Medicine and Biology Society, (EMBS 2007), Lyon, France, 23-26th august 2007. Remote patient monitoring in e-Health is everyday closer to be a mature technology / service. However, there is still a lack of development in areas such as standardization of the sensor’s communication interface, integration into Electronic Healthcare Record systems or incorporation in ambient-intelligent scenarios. This work identifies a...

  13. A network architecture for precision formation flying using the IEEE 802.11 MAC Protocol

    Science.gov (United States)

    Clare, Loren P.; Gao, Jay L.; Jennings, Esther H.; Okino, Clayton

    2005-01-01

    Precision Formation Flying missions involve the tracking and maintenance of spacecraft in a desired geometric formation. The strong coupling of spacecraft in formation flying control requires inter-spacecraft communication to exchange information. In this paper, we present a network architecture that supports PFF control, from the initial random deployment phase to the final formation. We show that a suitable MAC layer for the application protocol is IEEE's 802.11 MAC protocol. IEEE 802.11 MAC has two modes of operations: DCF and PCF. We show that DCF is suitable for the initial deployment phase while switching to PCF when the spacecraft are in formation improves jitter and throughput. We also consider the effect of routing on protocol performance and suggest when it is profitable to turn off route discovery to achieve better network performance.

  14. Real-Time Performance Analysis of Infrastructure-based IEEE 802.11 Distributed Coordination Function

    CERN Document Server

    Xia, Feng; Wang, Linqiang; Hao, Ruonan

    2012-01-01

    With the increasing popularity of wireless networks, wireless local area networks (WLANs) have attracted significant research interest, which play a critical role in providing anywhere and anytime connectivity. For WLANs the IEEE 802.11 standard is the most mature technology and has been widely adopted for wireless networks. This paper analyzes real-time performance of the IEEE 802.11 standard that adopts the MAC protocol of Distributed Coordination Function (DCF) operating in infrastructure mode. Extensive simulations have been done to examine how the network performance in terms of realtime metrics including effective data rate, latency and packet loss rate will be impacted by some critical parameters (e.g. CWmin and packet payload). The results are presented and analyzed. The analysis of simulation results can provide support for parameter configuration and optimization of WLANs for realtime applications.

  15. An Improved Markov Model for IEEE 802.15.4 Slotted CSMA/CA Mechanism

    Institute of Scientific and Technical Information of China (English)

    Hao Wen; Chuang Lin; Zhi-Jia Chen; Hao Yin; Tao He; Eryk Dutkiewicz

    2009-01-01

    IEEE 802.15.4 protocol is proposed to meet the low latency and energy consumption needs in low-rate wireless applications, however, few analytical models are tractable enough for comprehensive evaluation of the protocol. To evaluate the IEEE 802.15.4 slotted CSMA/CA channel access mechanism in this paper, we propose a practical and accurate discrete Markov chain model, which can dynamically represent different network loads. By computing the steady-state distribution probability of the Markov chain, we obtain an evaluation formula for throughput, energy consumption, and access latency. Then we further analyze the parameters that influence performance including packet arrival rate, initial backoff exponent and maximum backoff number. Finally, NS2 simulator has been used to evaluate the performance of the 802.15.4 CSMA/CA mechanism under different scenarios and to validate the accuracy of the proposed model.

  16. A Novel IEEE 802.15.4e DSME MAC for Wireless Sensor Networks

    Science.gov (United States)

    Sahoo, Prasan Kumar; Pattanaik, Sudhir Ranjan; Wu, Shih-Lin

    2017-01-01

    IEEE 802.15.4e standard proposes Deterministic and Synchronous Multichannel Extension (DSME) mode for wireless sensor networks (WSNs) to support industrial, commercial and health care applications. In this paper, a new channel access scheme and beacon scheduling schemes are designed for the IEEE 802.15.4e enabled WSNs in star topology to reduce the network discovery time and energy consumption. In addition, a new dynamic guaranteed retransmission slot allocation scheme is designed for devices with the failure Guaranteed Time Slot (GTS) transmission to reduce the retransmission delay. To evaluate our schemes, analytical models are designed to analyze the performance of WSNs in terms of reliability, delay, throughput and energy consumption. Our schemes are validated with simulation and analytical results and are observed that simulation results well match with the analytical one. The evaluated results of our designed schemes can improve the reliability, throughput, delay, and energy consumptions significantly.

  17. Performance evaluation of beacon enabled IEEE 802.15.4 under NS2

    CERN Document Server

    Charfi, Faiza

    2012-01-01

    The increasing demand for real-time applications has made the Quality of Service (Qos) support for wireless sensor networks (WSN) a fairly new research framework. In this paper, we propose an extended model of the Beacon enabled IEEE 802.15.4 including the Guaranteed Time Slot GTS allocation mechanism in the aim to analyze and evaluate network performances. Series of extensive simulations were performed to analyze the impact of the Beacon Order BO and the Superframe Order SO on the network performance based on commonly known metrics. In particular, we examine data packet delivery performance and the throughput for different duty cycle rates. Also, we analyze the impact of the number of nodes on collision probability. Thus, for high number of nodes, collision becomes higher and the reachability begins to decline slightly. We discuss and compare simulation results conducted under various parameter settings to the IEEE 802.11 network.

  18. Performance Evaluation Of BEACON-ENABLED IEEE 802.15.4 Under NS2

    Directory of Open Access Journals (Sweden)

    Faiza Charfi

    2012-04-01

    Full Text Available The increasing demand for real-time applications has made the Quality of Service (Qos support for wireless sensor networks (WSN a fairly new research framework. In this paper, we propose an extended model of the Beacon enabled IEEE 802.15.4 including the Guaranteed Time Slot GTS allocation mechanism in the aim to analyze and evaluate network performances. Series of extensive simulations were performed to analyze the impact of the Beacon Order BO and the Superframe Order SO on the network performance based on commonly known metrics. In particular, we examine data packet delivery performance and the throughput for different duty cycle rates. Also, we analyze the impact of the number of nodes on collision probability. Thus, for high number of nodes, collision becomes higher and the reachability begins to decline slightly. We discuss and compare simulation results conducted under various parameter settings to the IEEE 802.11network.

  19. A Novel IEEE 802.15.4e DSME MAC for Wireless Sensor Networks.

    Science.gov (United States)

    Sahoo, Prasan Kumar; Pattanaik, Sudhir Ranjan; Wu, Shih-Lin

    2017-01-16

    IEEE 802.15.4e standard proposes Deterministic and Synchronous Multichannel Extension (DSME) mode for wireless sensor networks (WSNs) to support industrial, commercial and health care applications. In this paper, a new channel access scheme and beacon scheduling schemes are designed for the IEEE 802.15.4e enabled WSNs in star topology to reduce the network discovery time and energy consumption. In addition, a new dynamic guaranteed retransmission slot allocation scheme is designed for devices with the failure Guaranteed Time Slot (GTS) transmission to reduce the retransmission delay. To evaluate our schemes, analytical models are designed to analyze the performance of WSNs in terms of reliability, delay, throughput and energy consumption. Our schemes are validated with simulation and analytical results and are observed that simulation results well match with the analytical one. The evaluated results of our designed schemes can improve the reliability, throughput, delay, and energy consumptions significantly.

  20. A COMPARISON OF IMPROVED AODV ROUTING PROTOCOL BASED ON IEEE 802.11 AND IEEE 802.15.4

    OpenAIRE

    2009-01-01

    Recently, wireless network industry for the ubiquitous generation is growing quickly. Especially, IEEE 802.15.4 is one of special issues of the networking technology for sensor network. Then, many researchers are studying it for enhanced performance. But many researchers are not focusing on developing routing protocol. So we had proposed improved AODV routing protocol in previous research. But it had studied about performance analysis based on IEEE 802.11. In this paper, we proposed improved ...

  1. Simulasi Kinerja Jaringan Nirkabel IEEE-802.11a dan IEEE-802.11g Menggunakan NS-2

    Directory of Open Access Journals (Sweden)

    Helm Fitriawan

    2014-03-01

    Full Text Available Wireless network uses transmission media based on radio waves. This type of networks is mainly useddue to its efficiency and mobility in data exchanging. This paper reports the modeling and simulation of wirelessnetworks based on Cisco Aironet 1130ag access point devices with IEEE 802.11a and IEEE 802.11g standards. Themodeling and simulation are performed using network simulator version 2 (NS-2 that is installed on operationsystem Linux Ubuntu v.10.10. The NS-2 is commonly used and works well in numerous types of network simulation. From simulation, we obtain quality of service parameters by employing several simulation scenarios in terms ofnumber of nodes, distances, and packet data sizes. It can be concluded from simulation results that the IEEE 802.11gnetworks transfer data with better quality than those of IEEE 802.11a networks.  Furthermore, the IEEE 802.11gnetworks provide a higher throughput, with smaller amount of delay and packet loss percentage compared to thoseof IEEE 802.11a networks.

  2. Architectural and Functional Design and Evaluation of E-Learning VUIS Based on the Proposed IEEE LTSA Reference Model.

    Science.gov (United States)

    O'Droma, Mairtin S.; Ganchev, Ivan; McDonnell, Fergal

    2003-01-01

    Presents a comparative analysis from the Institute of Electrical and Electronics Engineers (IEEE) Learning Technology Standards Committee's (LTSC) of the architectural and functional design of e-learning delivery platforms and applications, e-learning course authoring tools, and learning management systems (LMSs), with a view of assessing how…

  3. Downlink resource management for QoS scheduling in IEEE 802.16 WiMAX networks

    DEFF Research Database (Denmark)

    Wang, Hua; Dittmann, Lars

    2010-01-01

    IEEE 802.16, also known as WiMAX, has received much attention recently for its capability to support multiple types of applications with diverse Quality-of-Service (QoS) requirements. Beyond what the standard has defined, radio resource management (RRM) still remains an open issue, which plays...

  4. Resource management framework for QoS scheduling in IEEE 802.16 WiMAX networks

    DEFF Research Database (Denmark)

    Wang, Hua; Dittmann, Lars

    2009-01-01

    IEEE 802.16, also known as WiMAX, has received much attention recently for its capability to support multiple types of applications with diverse Quality-of-Service (QoS) requirements. Beyond what the standard has defined, radio resource management (RRM) still remains an open issue, which plays...

  5. Resource management framework for QoS scheduling in IEEE 802.16 WiMAX networks

    DEFF Research Database (Denmark)

    Wang, Hua; Dittmann, Lars

    2009-01-01

    IEEE 802.16, also known as WiMAX, has received much attention recently for its capability to support multiple types of applications with diverse Quality-of-Service (QoS) requirements. Beyond what the standard has defined, radio resource management (RRM) still remains an open issue, which plays...

  6. Matrices and society matrix algebra and its applications in the social sciences

    CERN Document Server

    Bradley, Ian

    2014-01-01

    Matrices offer some of the most powerful techniques in modem mathematics. In the social sciences they provide fresh insights into an astonishing variety of topics. Dominance matrices can show how power struggles in offices or committees develop; Markov chains predict how fast news or gossip will spread in a village; permutation matrices illuminate kinship structures in tribal societies. All these invaluable techniques and many more are explained clearly and simply in this wide-ranging book. Originally published in 1986. The Princeton Legacy Library uses the latest print-on-demand technology to

  7. IEEE Conference on Software Engineering Education and Training (CSEE&T 2012) Proceedings (25th, Nanjing, Jiangsu, China, April 17-19, 2012)

    Science.gov (United States)

    IEEE Conference on Software Engineering Education and Training, Proceedings (MS), 2012

    2012-01-01

    The Conference on Software Engineering Education and Training (CSEE&T) is the premier international peer-reviewed conference, sponsored by the Institute of Electrical and Electronics Engineers, Inc. (IEEE) Computer Society, which addresses all major areas related to software engineering education, training, and professionalism. This year, as in…

  8. IEEE Conference on Software Engineering Education and Training (CSEE&T 2012) Proceedings (25th, Nanjing, Jiangsu, China, April 17-19, 2012)

    Science.gov (United States)

    IEEE Conference on Software Engineering Education and Training, Proceedings (MS), 2012

    2012-01-01

    The Conference on Software Engineering Education and Training (CSEE&T) is the premier international peer-reviewed conference, sponsored by the Institute of Electrical and Electronics Engineers, Inc. (IEEE) Computer Society, which addresses all major areas related to software engineering education, training, and professionalism. This year, as…

  9. IEEE Conference on Software Engineering Education and Training (CSEE&T 2012) Proceedings (25th, Nanjing, Jiangsu, China, April 17-19, 2012)

    Science.gov (United States)

    IEEE Conference on Software Engineering Education and Training, Proceedings (MS), 2012

    2012-01-01

    The Conference on Software Engineering Education and Training (CSEE&T) is the premier international peer-reviewed conference, sponsored by the Institute of Electrical and Electronics Engineers, Inc. (IEEE) Computer Society, which addresses all major areas related to software engineering education, training, and professionalism. This year, as…

  10. A Novel Prioritization Scheme to Improve QoS in IEEE 802.11e Networks

    Directory of Open Access Journals (Sweden)

    Navid Tadayon

    2010-01-01

    Full Text Available IEEE 802.11 WLAN utilizes a distributed function at its MAC layer, namely, DCF to access the wireless medium. Due to its distributed nature, DCF is able to guarantee working stability in a wireless medium while maintaining the assembling and maintenance cost in a low level. However, DCF is inefficient in dealing with real-time traffics due to its incapability on providing QoS. IEEE 802.11e was introduced as a supplementary standard to cope with this problem. This standard introduces an Enhanced Distributed Coordination Function (EDCF that works based on diff-Serve model and can serve multiple classes of traffics (by using different prioritizations schemes. With the emergence of new time-sensitive applications, EDCF has proved to be yet inefficient in dealing with these kinds of traffics because it could not provide network with well-differentiated QoS. In this study, we propose a novel prioritization scheme to improve QoS level in IEEE 802.11e network. In this scheme, we replace Uniform PDF with Gamma PDF, which has salient differentiating properties. We investigate the suitability and superiority of this scheme on furnishing network with well-differentiated QoS using probabilistic analysis. We strengthen our claims by extensive simulation runs.

  11. Performance Analysis of Proposed Congestion Avoiding Protocol for IEEE 802.11s

    Directory of Open Access Journals (Sweden)

    Kishwer Abdul Khaliq

    2017-02-01

    Full Text Available The wireless technology is one of the core compo-nents of mobile applications with mobility support at low deploy-ment costs. Among these, Wireless Mesh Network (WMN is one of the technologies that supports mobile users for un-disrupted, reliable data connectivity, provides high bandwidth even in areas, where access of such services is difficult. Additionally, it features capabilities like self-configuring, self-healing, and self-organizing. IEEE proposed a MAC standard for WMN enhancements named IEEE 802.11s for multi-hop networks. Within this standard, the mandatory routing protocol called Hybrid Wireless Mesh Protocol (HWMP is proposed for efficient utilization of resources to achieve high bandwidth at MAC layer. To improve this protocol, a congestion avoiding protocol was proposed, which utilizes alternate paths just before the congestion state is reached. The proposed technique does not add any overhead, it utilizes congestion notification frame, which is already part of standard. This paper discusses simulation results of the proposed routing protocol against the existing HWMP protocol for packet delivery fraction, throughput and delay. The results indicate that the proposed technique significantly improves performance of IEEE 802.11s.

  12. A Kennedy Space Center implementation of IEEE 1451

    Science.gov (United States)

    Oostdyk, Rebecca L.; Mata, Carlos T.; Perotti, José M.; Lucena, Angel R.; Mullenix, Pamela A.

    2006-05-01

    To meet the demand for more reliable sensory data, longer sensor calibration cycles, and more useful information for operators at NASA's Kennedy Space Center (KSC), NASA's Instrumentation Branch and ASRC's Advanced Electronics and Technology Development Laboratory at the KSC are developing custom intelligent sensors based on the IEEE 1451 family of smart-sensor standards. The KSC intelligent sensors are known as Smart Networked Elements (SNEs), and each SNE includes transducers and their associated Transducer Electronic Data Sheets (TEDS), signal conditioning, analog-to-digital conversion, software algorithms for performing health checks on the data, and a network connection for sending data to other SNEs and higher-level systems. The development of the SNE has led to the definition of custom architectures, protocols, IEEE 1451 implementations, and TEDS, which are presented in this paper. The IEEE 1451 standards describe the architecture, message formats, software objects, and communication protocols within the smart sensor. Because of the standard's complexity, KSC has simplified the IEEE 1451 architecture and narrowed the scope of software objects to be included in the SNE to create a "light" IEEE 1451 implementation, and has used the manufacturer-defined TEDS to customize the SNE with health indicators. Furthermore, KSC has developed a protocol that allows the SNEs to communicate over an Ethernet network while reducing bandwidth requirements.

  13. A Heuristic Model of Consciousness with Applications to the Development of Science and Society

    Directory of Open Access Journals (Sweden)

    Peter A. Curreri

    2010-12-01

    Full Text Available A working model of consciousness is fundamental to understanding of the interactions of the observer in science. This paper examines contemporary understanding of consciousness. A heuristic model of consciousness is suggested that is consistent with psycophysics measurements of bandwidth of consciousness relative to unconscious perception. While the self reference nature of consciousness confers a survival benefit by assuring the all points of view regarding a problem are experienced in sufficiently large population, conscious bandwidth is constrained by design to avoid chaotic behavior. The multiple hypotheses provided by conscious reflection enable the rapid progression of science and technology. The questions of free will and the problem of attention are discussed in relation to the model. Finally the combination of rapid technology growth with the assurance of many unpredictable points of view is considered in respect to contemporary constraints to the development of society.

  14. A Heuristic Model of Consciousness with Applications to the Development of Science and Society

    Science.gov (United States)

    Curreri, Peter A.

    2010-01-01

    A working model of consciousness is fundamental to understanding of the interactions of the observer in science. This paper examines contemporary understanding of consciousness. A heuristic model of consciousness is suggested that is consistent with psycophysics measurements of bandwidth of consciousness relative to unconscious perception. While the self reference nature of consciousness confers a survival benefit by assuring the all points of view regarding a problem are experienced in sufficiently large population, conscious bandwidth is constrained by design to avoid chaotic behavior. The multiple hypotheses provided by conscious reflection enable the rapid progression of science and technology. The questions of free will and the problem of attention are discussed in relation to the model. Finally the combination of rapid technology growth with the assurance of many unpredictable points of view is considered in respect to contemporary constraints to the development of society.

  15. Towards a post-cash society: an application to convert fiat money into a cryptocurrency

    OpenAIRE

    Huckle, Steve; White, Martin; Bhattacharya, Rituparna

    2017-01-01

    In this paper, we discuss an application that uses blockchain technology to transfer fiat money into a cryptocurrency — Ether. A typical use of this technology could be to become a component of a larger system, whereby, after traveling, a customer can exchange leftover foreign currency for their local denomination. However, a more interesting application could be to convert fiat money into a cryptocurrency to facilitate a demonetisation scheme, such as that implemented recently in India. In t...

  16. IEEE 1451.0-2007 Compatible Smart Sensor Readout with Error Compensation Using FPGA

    Directory of Open Access Journals (Sweden)

    J. Kamala

    2009-03-01

    Full Text Available This paper deals with effective usage of user TEDS for developing smart sensor readout which is suitable to estimate and compensate the disturbances occurring in the system. The system parameters are incorporated along with other transducer data. Appropriate processing capabilities are built in Transducer Interface Module TIM for disturbance estimation and compensation. A Verilog based single chip module of IEEE 1451.0 smart sensor is proposed incorporating the above mentioned features. The architecture enables reliable and smart readout for sensors at low cost for a given application. The programmable nature of the proposed architecture enables wide usage of the smart sensor for various applications.

  17. Deployment of Directory Service for IEEE N Bus Test System Information

    Science.gov (United States)

    Barman, Amal; Sil, Jaya

    2008-10-01

    Exchanging information over Internet and Intranet becomes a defacto standard in computer applications, among various users and organizations. Distributed system study, e-governance etc require transparent information exchange between applications, constituencies, manufacturers, and vendors. To serve these purposes database system is needed for storing system data and other relevant information. Directory service, which is a specialized database along with access protocol, could be the single solution since it runs over TCP/IP, supported by all POSIX compliance platforms and is based on open standard. This paper describes a way to deploy directory service, to store IEEE n bus test system data and integrating load flow program with it.

  18. Low-frequency electrical dosimetry: research agenda of the IEEE International Committee on Electromagnetic Safety.

    Science.gov (United States)

    Reilly, J Patrick; Hirata, Akimasa

    2016-06-21

    This article treats unsettled issues in the use of numerical models of electrical dosimetry as applied to international limits on human exposure to low-frequency (typically  IEEE-ICES (International Committee on Electromagnetic Safety) Technical Committee 95. The paper discusses 25 issues needing attention, fitting into three general categories: induction models; electrostimulation models; and human exposure limits. Of these, 9 were voted as 'high priority' by members of Subcommittee 6. The list is presented as a research agenda for refinements in numerical modeling with applications to human exposure limits. It is likely that such issues are also important in medical and electrical product safety design applications.

  19. Building smart sensor nodes according to IEEE 1451.3 standard.

    Science.gov (United States)

    da Costa, Murilo N J; Neto, Olegario C S; Ferreira, José O; da Rocha, Adson F; de A Barbosa, Talles M G

    2011-01-01

    A Body Sensor Network (BSN) application requires many software and hardware adaptations to support correctly data exchanges between different sensor node architectures. However, these customizations demand extra time, cost and components. This paper introduces a simple development process in order to customize off-the-shelf BSN sensor nodes according to Transducer Bus Interface Modules (TBIM) standard. IEEE 1451.3 offers technical solutions for interfacing multiple and physically separated transducer allowing self-identification, self-configuration, plug and play and hot swapping capabilities. These are important requirements relating to most BSN applications.

  20. Implicit Block ACK Scheme for IEEE 802.11 WLANs

    Science.gov (United States)

    Sthapit, Pranesh; Pyun, Jae-Young

    2016-01-01

    The throughput of IEEE 802.11 standard is significantly bounded by the associated Medium Access Control (MAC) overhead. Because of the overhead, an upper limit exists for throughput, which is bounded, including situations where data rates are extremely high. Therefore, an overhead reduction is necessary to achieve higher throughput. The IEEE 802.11e amendment introduced the block ACK mechanism, to reduce the number of control messages in MAC. Although the block ACK scheme greatly reduces overhead, further improvements are possible. In this letter, we propose an implicit block ACK method that further reduces the overhead associated with IEEE 802.11e’s block ACK scheme. The mathematical analysis results are presented for both the original protocol and the proposed scheme. A performance improvement of greater than 10% was achieved with the proposed implementation.

  1. Nanostructured powders and their industrial application. Materials Research Society symposium proceedings Volume 520

    Energy Technology Data Exchange (ETDEWEB)

    Beaucage, G.; Mark, J.E.; Burns, G.T.; Hua, D.W. [eds.

    1998-07-01

    This new volume from the MRS brings together industrial and academic researchers involved in the synthesis and use of nanostructured powders such as fumed silica, pyrolytic titania and precipitated silica, as well as less conventional nanostructured powders such as exfoliated clays. Similarities and differences among these various fields of study and application are featured. In some ways, the volume is a continuation of the ``Better Ceramics Through Chemistry'' series. One main difference, however, is that this volume focused on the industrial use of these materials. Topics include: overview of nanopowder technology; physical aspects of nanostructured powders; synthesis of nanostructured powders; and applications of nanostructured powders.

  2. System Behavior Specification Using IEEE Std 1175.4

    Science.gov (United States)

    2010-04-27

    22nd Annual Systems & Software Technology Conference S stem Beha ior Specification1 7 y v Using IEEE Std 1175.4 e v i e w 5 2 8 1 2 R 27 April...DATE 27 APR 2010 2. REPORT TYPE 3. DATES COVERED 00-00-2010 to 00-00-2010 4. TITLE AND SUBTITLE System Behavior Specification Using IEEE Std ...RESPONSIBLE PERSON a. REPORT unclassified b. ABSTRACT unclassified c. THIS PAGE unclassified Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std

  3. IEEE 802.15.4 Modifications and Their Impact

    Directory of Open Access Journals (Sweden)

    M. Goyal

    2011-01-01

    Full Text Available IEEE 802.15.4 is a popular choice for MAC/PHY protocols in low power and low data rate wireless sensor networks. In this paper, we suggest several modifications to beaconless IEEE 802.15.4 MAC operation and evaluate their impact on the performance via stochastic modeling and simulations. We found that the utility of these modifications is strongly dependent on the traffic load on the network. Accordingly, we make recommendations regarding how these modifications should be used in view of the prevalent traffic load on the network.

  4. Research on IEEE 802.11 wireless local area networks standards%IEEE802.11无线局域网标准研究

    Institute of Scientific and Technical Information of China (English)

    李浩; 高泽华; 高峰; 赵荣华

    2009-01-01

    介绍了IEEE 802.11全系列标准,研究了IEEE 802.11系列各标准的发展轨迹和相互关系,建立了该系列标准的层次模型.研究并分析了IEEE 802.11、IEEE 802.11a、IEEE 802.11b、IEEE 802.11g和IEEE 802.11n这几种常见标准,并对相应物理层和媒质访问控制层的关键技术作了重点分析.

  5. 科技期刊中IEEE文献著录的常见问题%Common problems in rererencing IEEE articles in sci-tecj periodicals

    Institute of Scientific and Technical Information of China (English)

    程建霞; 吕雪梅; 杨波; 王小唯

    2011-01-01

    IEEE Computer Society析出文献为例,指出我国科技期刊对美国IEEE协会析出文献的著录中存在的问题和常见错误,分析造成错误的原因,对原始文献进行了正确的著录,并对一些信息缺失文献的著录提出了处理建议.%Common problems and errors in referencing IEEE articles in Chinese sci-tech periodicals are discussed. IEEE Computer Society bibliographic literatures are given as examples.This paper analyzes the reasons causing the errors, and corrects some original bibliographic literatures. Recommendations are made for referencing the literatures with missing items.

  6. Analysis of performance of wireless sensor networks based on IEEE 802.15.4%基于IEEE802.15.4的无线传感器网络性能分析

    Institute of Scientific and Technical Information of China (English)

    向碧群; 李艳体; 王小平; 李云

    2011-01-01

    通过将IEEE 802.15.4标准中的超帧与无线传感器网络的LEACH协议结合,在星型网络拓扑下,网络节点通过申请超帧中的GTS来进行无冲突的数据通信,对使用GTS传输数据的这一过程进行了研究,从理论上分析了无线传感器网络的网络性能.仿真结果说明了网络控制参数对网络性能的影响,为今后无线传感器网络应用中的参数配置提供了一定的理论基础.%Based on IEEE 802. 15. 4 standard, this paper combined the superframe of IEEE 802. 15. 4 with the LEACH of WSN. In the star topology the nodes would communicate without contention. It researched the communication in the guaran-teed time slot of superframe in IEEE 802.15.4. Then analyzed the performance of WSN theoretically.' The analysis and simu-lation results show the influence of control parameters on the performance of networks, the result will provide certain basement for the application of WSN.

  7. 无线个域网mesh网络标准——IEEE 802.15.5%Standard of mesh wireless personal area network——IEEE 802.15.5

    Institute of Scientific and Technical Information of China (English)

    史晓晨; 刘凯明; 高锦春; 刘元安

    2011-01-01

    In order to further understand the IEEE 802.15.5 standard, this paper introduced the reference model, key technologies and applications of 802.15.5.It described the ability of IEEE 802.15.5 for supporting mesh fully, then compared the differences of HR-WPAN and LR-WPAN, at last discussed the unresolved topics of WPAN and development trends in this field.%为了进一步理解IEEE 802.15.5标准,对802.15.5的结构模型、关键技术及应用进行了介绍.讨论了IEEE 802.15.5对mesh网络的完全支持能力,并对高速个域网(HR-WPAN)和低速个域网(LR-WPAN)两种情况进行了比较,最后给出了WPAN存在的问题及展望.

  8. 基于IEEE1149.1及IEEE1149.4标准的测试技术研究%Study of test techniques based on IEEE1149.1 and IEEE1149.4

    Institute of Scientific and Technical Information of China (English)

    苏波

    2012-01-01

    With rapid development of electronic technology, the integrated degree of circuits has greatly increased) more and more problems have to be faced in the field of test. The technology of DFT( design for testability) is one of the key solutions to deal with the problems of test. And the boundary-scan technology is a kind of the DFT methods, which is used widely. With intensive study on IEEE std 1149. 4 and IEEE std 1149.1 .this paper explores the testability structure based on boundary-scan,the result of the paper has important theory value and practical significance.%随着电子技术的飞速发展,电路的集成度越来越高,使其测试面临越来越多的问题.可测性设计成为解决测试问题的主要手段之一,而边界扫描技术是众多可测性设计方法中使用较为广泛的一种.在深入研究IEEE1149.1及IEEE1149.4标准的基础上,对基于边界扫描可测性结构进行了探索,具有重要的理论价值和实际意义.

  9. Local Positioning Services on IEEE 802.11 Networks

    Directory of Open Access Journals (Sweden)

    A. M. Vegni

    2008-06-01

    Full Text Available This paper deals with localization services in IEEE 802.11 networks, for indoor environment. The proposed solution processes the Time Of Arrival of location packets sent by a Mobile Terminal, that makes access in a IEEE 802.11 network. A set of Location Supporting Nodes and a Location Support Server composes an indoor location services architecture. A fully compatible IEEE 802.11 Localization Services protocol supporting data exchange related to both TOA measurement and processing is reported. Simulation results show the method efficiency in both IEEE 802.11 PCF and DCF modes. Assessment of the maximum number of users for which location services can be provided is also reported. Since high localization accuracy requires large bandwidth, a broadband antenna for LSN and LSS was designed. The related results are reported in the second part of the paper. The antenna works at 5.0 GHz (centre frequency in broadband mode and is matched on the wireless operating frequencies with a percentage more than 8% (1:1.5 VSWR.

  10. Specialty and Systems Engineering Supplement to IEEE 15288.1

    Science.gov (United States)

    2017-08-28

    15288.1 Tailoring Language ............................................................................ 2 3.2.1 Specialty Engineering Analysis and...believed necessary to maintain the level or rigor required by national security space acquisitions . 2. Context IEEE-15288.1: 2014, Standard for...be: 1. Normative (requirements rather than informative guidance), 2. Tailored appropriately for specific acquisition /contract considerations, and 3

  11. Editorial for IEEE Transactions on Power Electronics, January 2013

    DEFF Research Database (Denmark)

    Blaabjerg, Frede; Lehman, Brad

    2013-01-01

    should increase the impact factor of the IEEE TRANSACTIONS ON POWER ELECTRONICS (TPEL). In 2007, TPEL published 2600 pages, and it has gradually been increased to 4000 pages in 2011, 5000 pages in 2012, and 5500 pages are projected for 2013. We have decided to publish 12 printed issues so every month...

  12. Editorial for the IEEE Transactions on Power Electronics, January 2009

    DEFF Research Database (Denmark)

    Blaabjerg, Frede

    2009-01-01

    I am entering the fourth year as the Editor in Chief of the IEEE TRANSACTIONS ON POWER ELECTRONICS. A position like this becomes more and more important for the technical field as publishing in a peer-reviewed highly ranked journal has influence on the industrial and academic career. It is a way...

  13. A timed verification of the IEEE 1394 leader election protocol

    NARCIS (Netherlands)

    Romijn, J.M.T.

    1999-01-01

    The IEEE 1394 architecture standard defines a high performance serial multimedia bus that allows several components in a network to communicate with each other at high speed. In the physical layer of the architecture, a leader election protocol is used to find a spanning tree with a unique root in t

  14. Next generation WLAN technology--IEEE 802.11ac%下一代WLAN技术IEEE 802.11ac

    Institute of Scientific and Technical Information of China (English)

    郭正跃

    2013-01-01

    IEEE 802.11ac是继802.11n的下一代无线局域网新技术标准,本文主要介绍了802.11ac在新技术方面的特性,重点介绍了MU-MIMO系统在802.11ac中的应用,包括MU-MIMO中多用户调度公平性问题的解决及目前最新的SLNR波束成形技术对多用户间干扰问题的解决方案。%IEEE 802.11ac is the second generation of 802.11n wireless LAN technical standard. The paper mainly introduces the features in new technical aspect and highlights the MU-MIMO system in the application of 802.11ac including the solution of multi-user scheduling fairness problem in MU-MIMO and the latest SLNR beam-forming techniques for multi-user interference.

  15. Service design projects sponsored by the Kansas State University Student Chapter of the IEEE EMBS.

    Science.gov (United States)

    Griffith, Connor; Gruber, Lucinda; Young, Ethan; Humphrey, Jason; Warren, Steve

    2008-01-01

    Service projects offer volunteer student organizations a means to generate interest and focus activity outside of the context of the classroom. This paper addresses efforts by the Kansas State University (KSU) Student Chapter of the IEEE Engineering in Medicine and Biology Society (EMBS) to initiate and guide service projects in two primary areas: (1) research to aid persons with disabilities (RAPD) and (2) hands-on efforts to interest young women in the quantitative fields of science and engineering. Three RAPD projects are presented: a computer mouse design that helps to alleviate productivity problems associated with Parkinson's tremors, a battery removal tool for arthritic individuals with limited dexterity, and a wireless door control and communication system to assist mobility-limited individuals. Service projects to garner science and engineering interest in young women are co-sponsored by the KSU Women in Engineering and Science Program (WESP). The most recent activity, entitled 'Vital Signs Shirts,' is presented in this paper, along with a summary of pending interactive laboratories designed to interest participants in engineering as applied to the human body. These service projects encourage IEEE EMBS student chapter members to explore their biomedical engineering interests and make a positive impact in the community.

  16. Autism Society

    Science.gov (United States)

    ... En Español Register today for the 49th Annual Autism Society National Conference Please plan on joining us ... Today Improving the lives of all affected by autism. The Autism Society is the nation's leading grassroots ...

  17. Enhancement of the IEEE 802.11 Power Saving Mode by Prioritized Reservations

    OpenAIRE

    Xiaoying Lei; Seung Hyong Rhee

    2015-01-01

    The increasing demand for real-time applications in WSN has raised the requirement of protocols considering both energy efficiency and end-to-end delay. A PSM is proposed in the IEEE 802.11 protocol to reduce the power consumptions of wireless nodes. Wireless nodes can stay in doze mode and periodically wake up to retrieve the frames buffered in the APs. However, the 802.11 PSM is not such energy efficiency for WSN. First, in the process of the node’s transmitting polling frames to AP, channe...

  18. 4th IEEE/ACIS International Conference on Computer and Information Science

    CERN Document Server

    2016-01-01

    This edited book presents scientific results of the 14th IEEE/ACIS International Conference on Computer and Information Science (ICIS 2015) which was held on June 28 – July 1, 2015 in Las Vegas, USA. The aim of this conference was to bring together researchers and scientists, businessmen and entrepreneurs, teachers, engineers, computer users, and students to discuss the numerous fields of computer science and to share their experiences and exchange new ideas and information in a meaningful way. Research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them.

  19. The G8-global healthcare applications project (GHAP) - recommendations for the way into the information society

    Science.gov (United States)

    Dietzel

    1999-12-16

    The Global Healthcare Applications Project has sought to demonstrate the potential of telematics in the field of medicine and healthcare and to promote joint approaches to issues such as the setting of standards. This has been done through 10 sub-projects covering a range of applications and issues: 1. Towards a global public health information network - Coordinator: Germany (Ulrich Laaser, ulaaser@mail.uni-bielefeld.de; URL: http://health.ibs.uni-bielefeld. de/i-jphe/database/documents/abstract/laaser-g7.htm(C45-60_laaser-g7. pdf) 2. Improving prevention, early detection, diagnosis and treatment of cancer. - Coordinator: France (Gerard Brugal, gerard. brugal@imag.fr; URL: http://pathconsult.imag.fr/G7/G7_index.html) 3. Improving prevention, diagnosis and treatment of major cardiovascular diseases. - Coordinator: Italy (Attilio Maseri, amaseri@rm.unicatt.it; URL: http://www.g7cardio.org) 4. International concerted action for collaboration in telemedicine. - Coordinator: Canada (Andre Lacroix, lacroixa@ere.umontreal.ca; URL: http:// www.g7sp4.org) 5. Enabling mechanisms for a global healthcare network, including Internet connectivity. - Coordinator: UK (Ray Rogers, r.rogers@mcmail.com; URL: http://www.ehto.be/sp5) 6. International harmonisation of the use of data cards in healthcare: Internet Connectivity Coordinator: USA (Elliot R. Siegel, siegel@nlm.nih.gov; URL: http://www.nlm.nih.gov/) - Smart Cards and information exchange security in health care Joint Coordinators: France, European Commission, Italy and Germany (Jacques Sauret, jacques.sauret@sante.gouv.fr and G8-HC@sesam-vitale.fr; URL: http:/www.sesam-vitale.fr/Projects/Netlink-G7-En/) 7. Evidence and effectiveness. - Coordinator: Canada (Andrew Penn, andrew. penn@ualberta.ca; URL: http://www.medlib.com/spi/web.htm) 8. Multilingual anatomical digital database. - Coordinator: USA (Michael J. Ackermann; URL: http://www.nlm.nih.gov) 9. Medical image reference centre. - Coordinator: Japan (Eturo Kashiwagi

  20. Enhancing MAC performance of DCF protocol for IEEE 802.11 wireless LANs

    National Research Council Canada - National Science Library

    Woo-Yong Choi

    2017-01-01

    ...) protocol of IEEE 802.11 wireless LANs and compatible with various IEEE 802.11 PHY extensions. The performance of the DCF degrades exponentially as the number of nodes participating in the DCF transmission procedure increases...

  1. Evaluating IEEE 802.15.4 for Cyber-Physical Systems

    Directory of Open Access Journals (Sweden)

    Vinel Alexey

    2011-01-01

    Full Text Available With rapid advancements in sensing, networking, and computing technologies, recent years have witnessed the emergence of cyber-physical systems (CPS in a broad range of application domains. CPS is a new class of engineered systems that features the integration of computation, communications, and control. In contrast to general-purpose computing systems, many cyber-physical applications are safety critical. These applications impose considerable requirements on quality of service (QoS of the employed networking infrastruture. Since IEEE 802.15.4 has been widely considered as a suitable protocol for CPS over wireless sensor and actuator networks, it is of vital importance to evaluate its performance extensively. Serving for this purpose, this paper will analyze the performance of IEEE 802.15.4 standard operating in different modes respectively. Extensive simulations have been conducted to examine how network QoS will be impacted by some critical parameters. The results are presented and analyzed, which provide some useful insights for network parameter configuration and optimization for CPS design.

  2. IEEE Computer Society/Software Engineering Institute Software Process Achievement (SPA) Award 2009

    Science.gov (United States)

    2011-03-01

    Accenture, it has a strong Microsoft relationship” [ McNeill 2009]. 2009 Forrester “Infosys has developed a Customer Value Management suite to help...www.businessweek.com/magazine/content/09_16/b4127046252968.htm?chan=magazine+c hannel_in%3A+inside+innovation (2009). [Juniper 2009] Juniper, Charles ...search, Gartner, 2008. www-935.ibm.com/services/in/gbs/app/pdf/article4.pdf CMU/SEI-2011-TR-008 | 38 [ McNeill 2009] McNeill , Robert and McNee

  3. Approximation of the IEEE 802.11p standard using commercial off-the-shelf IEEE 802.11a hardware

    OpenAIRE

    2011-01-01

    IEEE 802.11p hardware is hard to find. Previous research efforts often relied on project-specific prototype implementations which are characterized by a high cost and are not always available to the entire research community. Commercially available turnkey implementations are rare and quite expensive compared to commercial of-the-shelf (COTS) IEEE 802.11a/b/g hardware. However, the difference between the IEEE 802.11p amendment and the other IEEE 802.11 standards is quite small. It can be seen...

  4. Planetary Society

    Science.gov (United States)

    Murdin, P.

    2000-11-01

    Carl Sagan, Bruce Murray and Louis Friedman founded the non-profit Planetary Society in 1979 to advance the exploration of the solar system and to continue the search for extraterrestrial life. The Society has its headquarters in Pasadena, California, but is international in scope, with 100 000 members worldwide, making it the largest space interest group in the world. The Society funds a var...

  5. RATE ADAPTIVE PROTOCOL FOR MULTIRATE IEEE 802.11 NETWORKS

    Institute of Scientific and Technical Information of China (English)

    Xi Yong; Huang Qingyan; Wei Jibo; Zhao Haitao

    2007-01-01

    In this paper,a rate adaptive protocol AMARF(Adaptive Multirate Auto Rate Fallback)for multirate IEEE 802.11 networks is proposed.In AMARF,each data rate is assigned a unique success threshold,which is a criterion to judge when to switch a rate to the next higher one,and the success thresholds call be adjusted dynamically in an adaptive manner according to the running conditions,such as packet length and channel parameters.Moreover,the proposed protocol can be implemented by software without any change to the current IEEE 802.11 standards.Simulation result shows that AMARF yields significantly higher throughput than other existing schemes including ARF and its variants,in various running conditions.

  6. Performance analysis of IEEE 802.11 DCF networks

    Institute of Scientific and Technical Information of China (English)

    Krzysztof SZCZYPIORSKI; Jázef LUBZCZ

    2008-01-01

    This paper presents an analytical saturation throughput model of IEEE 802.11DCF (distributed coordination function)with basic access in ad hoc mode. The model takes into account freezing of the backoff timer when a station senses busy channel.It is shown that taking into account this feature of DCF is important in modeling saturation throughput by yielding more accurate and realistic results than models known from literature. The proposed analytical model also takes into account the effect of transmission errors. All essential features of the proposed analytical approach are illustrated with numerical results. The presen-tation of the model is proceeded by an overview of approaches to IEEE 802.11 network performance evaluation presented in the literature.

  7. Avago首席科学家荣获IEEE Fellow奖

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Avago Technologies(安华高科技)宣布John Larson Ⅲ博士在英国哥伦比亚范库弗峰州举办的2006年国际超声波研讨会上荣获知名的IEEE Fellow奖。IEEE Fellow奖由专业人员提名产生,旨在表彰在各个工程设计领域中取得杰出成绩的人才。Avago Technologies(安华高科技)是为先进的通信、工业和商业等应用领域提供创新的半导体解决方案的领导厂商。

  8. Throughput analysis of the IEEE 802.4 token bus standard under heavy load

    Science.gov (United States)

    Pang, Joseph; Tobagi, Fouad

    1987-03-01

    It has become clear in the last few years that there is a trend towards integrated digital services. Parallel to the development of public Integrated Services Digital Network (ISDN) is service integration in the local area (e.g., a campus, a building, an aircraft). The types of services to be integrated depend very much on the specific local environment. However, applications tend to generate data traffic belonging to one of two classes. According to IEEE 802.4 terminology, the first major class of traffic is termed synchronous, such as packetized voice and data generated from other applications with real-time constraints, and the second class is called asynchronous which includes most computer data traffic such as file transfer or facsimile. The IEEE 802.4 token bus protocol which was designed to support both synchronous and asynchronous traffic is examined. The protocol is basically a timer-controlled token bus access scheme. By a suitable choice of the design parameters, it can be shown that access delay is bounded for synchronous traffic. As well, the bandwidth allocated to asynchronous traffic can be controlled. A throughput analysis of the protocol under heavy load with constant channel occupation of synchronous traffic and constant token-passing times is presented.

  9. Predictable and reliable ECG monitoring over IEEE 802.11 WLANs within a hospital.

    Science.gov (United States)

    Park, Juyoung; Kang, Kyungtae

    2014-09-01

    Telecardiology provides mobility for patients who require constant electrocardiogram (ECG) monitoring. However, its safety is dependent on the predictability and robustness of data delivery, which must overcome errors in the wireless channel through which the ECG data are transmitted. We report here a framework that can be used to gauge the applicability of IEEE 802.11 wireless local area network (WLAN) technology to ECG monitoring systems in terms of delay constraints and transmission reliability. For this purpose, a medical-grade WLAN architecture achieved predictable delay through the combination of a medium access control mechanism based on the point coordination function provided by IEEE 802.11 and an error control scheme based on Reed-Solomon coding and block interleaving. The size of the jitter buffer needed was determined by this architecture to avoid service dropout caused by buffer underrun, through analysis of variations in transmission delay. Finally, we assessed this architecture in terms of service latency and reliability by modeling the transmission of uncompressed two-lead electrocardiogram data from the MIT-BIH Arrhythmia Database and highlight the applicability of this wireless technology to telecardiology.

  10. 认识IEEE1394端口

    Institute of Scientific and Technical Information of China (English)

    王玉岭

    2005-01-01

    Apple称之为FireWire(火线)Sony称之为i.Link Texas Instruments称之为Lynx。尽管各厂商注册的商标名称不同,但实质都是一项技术,那就是IEEE1394。为什么PC业界对其会如此着迷呢?

  11. 17th IEEE NPSS Real Time Conference – RT-2010

    CERN Multimedia

    Carlos Varandas

    2010-01-01

    Congress Centre of “Instituto Superior Técnico”, Lisboa, Portugal, 24-28 May, 2010 ABSTRACT SUBMISSION OPEN Abstract Submission Deadline: March 1st, 2010 Dear Sir/Madam, We are pleased to announce that abstract submission for the 17th IEEE NPSS Real Time Conference is now open on our web site. The deadline for submitting an abstract is 1st March 2010. Full conference details General Chairman

  12. Dynamic subframe allocation for mobile broadband m-health using IEEE 802.16j mobile multihop relay networks.

    Science.gov (United States)

    Alinejad, Ali; Istepanian, R S H; Philip, N

    2012-01-01

    The concept of 4G health will be one of the key focus areas of future m-health research and enterprise activities in the coming years. WiMAX technology is one of the constituent 4G wireless technologies that provides broadband wireless access (BWA). Despite the fact that WiMAX is able to provide a high data rate in a relatively large coverage; this technology has specific limitations such as: coverage, signal attenuation problems due to shadowing or path loss, and limited available spectrum. The IEEE 802.16j mobile multihop relay (MMR) technology is a pragmatic solution designed to overcome these limitations. The aim of IEEE 802.16j MMR is to expand the IEEE 802.16e's capabilities with multihop features. In particular, the uplink (UL) and downlink (DL) subframe allocation in WiMAX network is usually fixed. However, dynamic frame allocation is a useful mechanism to optimize uplink and downlink subframe size dynamically based on the traffic conditions through real-time traffic monitoring. This particular mechanism is important for future WiMAX based m-health applications as it allows the tradeoff in both UL and DL channels. In this paper, we address the dynamic frame allocation issue in IEEE 802.16j MMR network for m-health applications. A comparative performance analysis of the proposed approach is validated using the OPNET Modeler(®). The simulation results have shown an improved performance of resource allocation and end-to-end delay performance for typical medical video streaming application.

  13. IEEE 802.11p协议数据收发控制器的状态仿真%Simulation of States for Protocol Data Transceiver Controller Based on IEEE 802.11p

    Institute of Scientific and Technical Information of China (English)

    阮峥

    2015-01-01

    无线接入技术应用的广泛拓展,IEEE 802.11p作为针对快速移动环境的无线接入而产生.该文研究了该协议物理层数据帧的组帧原理、收发控制协议,最后使用Verilog硬件描述语言(HDL)在Altera QuartusⅡ环境下仿真实现了该协议下的数据帧收发控制器.%With the expansion of application range of wireless access, IEEE 802.11p emerges as protocol adapted to the environ-ment of fast moving. This paper studies principle of data frame and control protocol of physical layer, and finally simulations for transceiver controller are conducted with Verilog hardware design language under Altera QaurtusⅡ.

  14. Coexistence of IEEE 802.11b/g WLANs and IEEE 802.15.4 WSNs: Modeling and Protocol Enhancements

    NARCIS (Netherlands)

    Yuan, W.

    2011-01-01

    As an emerging short-range wireless technology, IEEE 802.15.4/ZigBee Wireless Sensor Networks (WSNs) are increasingly used in the fields of home control, industrial control, consumer electronics, energy management, building automation, telecom services, personal healthcare, etc. IEEE

  15. Coexistence of IEEE 802.11b/g WLANs and IEEE 802.15.4 WSNs: Modeling and Protocol Enhancements

    NARCIS (Netherlands)

    Yuan, W.

    2011-01-01

    As an emerging short-range wireless technology, IEEE 802.15.4/ZigBee Wireless Sensor Networks (WSNs) are increasingly used in the fields of home control, industrial control, consumer electronics, energy management, building automation, telecom services, personal healthcare, etc. IEEE 802.15.4/Zig-Be

  16. Implementing ISO/IEEE 11073: proposal of two different strategic approaches.

    Science.gov (United States)

    Martínez-Espronceda, M; Serrano, L; Martínez, I; Escayola, J; Led, S; Trigo, J; García, J

    2008-01-01

    This paper explains the challenges encountered during the ISO/IEEE 11073 standard implementation process. The complexity of the standard and the consequent heavy requirements, which have not encouraged software engineers to adopt the standard. The developing complexity evaluation drives us to propose two possible implementation strategies that cover almost all possible use cases and eases handling the standard by non-expert users. The first one is focused on medical devices (MD) and proposes a low-memory and low-processor usage technique. It is based on message patterns that allow simple functions to generate ISO/IEEE 11073 messages and to process them easily. In this way a framework for MDs can be obtained. Second one is focused on more powerful machines such as data loggers or gateways (aka. computer engines (CE)), which do not have the MDs' memory and processor usage constraints. For CEs a more intelligent and adaptative Plug&Play (P&P) solution is provided. It consists on a general platform that can access to any device supported by the standard. Combining both strategies will cut developing time for applications based on ISO/EEE 11073.

  17. Performance of IEEE 802.15.4 Clusters with Power Management and Key Exchange

    Institute of Scientific and Technical Information of China (English)

    Fereshteh Amini; Moazzam Khan; Jelena Mi(s)i(c); Hossein Pourreza

    2008-01-01

    The IEEE 802.15.4 specification is a recent low data rate wireless personal area network standard. While basic security services are provided for, there is a lack of more advanced techniques which are indispensable in modern personal area network applications. In addition, performance implications of those services are not known. In this paper, we describe a secure data exchange protocol based on the Zig Bee specification and built on top of IEEE 802.15.4 link layer. This protocol includes a key exchange mechanism. We assume that all nodes are applying power management technique based on thecons tant event sensing reliability required by the coordinator. Power management generates random sleep times by every node which in average fairly distributes the sensing load among the nodes. Key exchange is initiated by a cluster coordinator after some given number of sensing packets have been received by the coordinator. We develop and integrate simulation model of the key exchange and power management technique into the cluster's reliable sensing function. We evaluate the impact of security function and its periodicity on cluster performance.

  18. A Source-Based Multicast Scheme in IEEE 802.16 Mesh Mode

    Directory of Open Access Journals (Sweden)

    Ali Azarpeyvand

    2012-12-01

    Full Text Available WiMAX based on IEEE 802.16 is known as one of effective technologies for transmission of multimedia to groups of receivers. There are two operational modes in WiMAX: point to multi point (PMP for single hop transmission and a mesh node for multi-hop transmission. The current standard only defines unicast transmission under mesh mode thus the performance is deteriorated for multimedia applications with multicast nature. In this paper, we first propose a mechanism for source-based tree topology construction aiming at facilitating multicast transmission in WiMAX mesh network. In the proposed approach, the multicast tree is constructed considering available link’s bandwidth and multicast group members. After constructing the multicast tree we propose a novel scheduling algorithm to improve the transmission throughout. In the proposed scheduling algorithm a parent node uses broadcasting when the number of its children belonging to a multicast group excesses a threshold. Extensive simulation results show that the proposed multicast mechanism improves multicast transmission efficiency and reduces scheduling time slots noticeably in comparison to the approach mandated by the IEEE 802.16 standard.

  19. MAC Security and Security Overhead Analysis in the IEEE 802.15.4 Wireless Sensor Networks

    Directory of Open Access Journals (Sweden)

    Sethi Sakshi

    2006-01-01

    Full Text Available Sensor networks have many applications. However, with limited resources such as computation capability and memory, they are vulnerable to many kinds of attacks. The IEEE 802.15.4 specification defines medium access control (MAC layer and physical layer for wireless sensor networks. In this paper, we propose a security overhead analysis for the MAC layer in the IEEE 802.15.4 wireless sensor networks. Furthermore, we survey security mechanisms defined in the specification including security objectives, security suites, security modes, encryption, authentication, and so forth. Then, security vulnerabilities and attacks are identified. Some security enhancements are proposed to improve security and to prevent these attacks such as same-nonce attack, denial-of-service attack, reply-protection attack, ACK attack, and so forth. Our results show that, for example, with 128-bit key length and 100 MIPS, encryption overhead is 10.28 s per block, and with 100 MIPS and 1500-byte payload, the encryption overhead is as high as 5782.5 s.

  20. A Green Media Access Method for IEEE 802.15.6 Wireless Body Area Network.

    Science.gov (United States)

    Jacob, Anil K; Jacob, Lillykutty

    2017-09-30

    It is of utmost importance to conserve battery energy to the maximum possible extent in WBAN nodes while collecting and transferring medical data. The IEEE 802.15.6 WBAN standard does not specify any method to conserve energy. This paper focuses on a method to conserve energy in IEEE 802.15.6 WBAN nodes when using CSMA/CA, while simultaneously restricting data delivery delay to the required value as specified in medical applications. The technique is to allow the nodes to sleep all the times except for receiving beacons and for transmitting data frames whenever a data frame enters an empty buffer. The energy consumed by the nodes and the average latency of data frame for periodical arrival of data are found out analytically. The analytical results are validated and also the proposed method is compared with other energy conserving schemes, using Castalia simulation studies. The proposed method shows superior performance in both device lifetime and latency of emergency medical data.

  1. Experimental Performance Evaluation of Multihop IEEE 802.15.4/4g/4e Smart Utility Networks in Outdoor Environment

    Directory of Open Access Journals (Sweden)

    Chin-Sean Sum

    2017-01-01

    Full Text Available This paper presents the experimental performance evaluation results of the IEEE 802.15.4/4g/4e Smart Utility Networks (SUN in applications suited for outdoor environment. SUN is an advanced wireless communications network designed for reliable, low data rate, and low energy consumption networks for command-and-control applications like utility service, sensor network, and so on. IEEE 802.15.4g/4e is the international standard for SUN supported by multiple utility providers and product vendors. In this paper, a comprehensive field test was conducted by employing the implementation we have developed to evaluate the performance of the SUN devices based on IEEE 802.15.4/4g/4e standard. The output power of the implementation is 250 mW for extended range, reducible to 20 mW for short-range scalability and battery preservation. Results showed that in an outdoor line-of-sight environment, the achievable one-hop range of a 50 kbps SUN device was 450 m. Next, in a non-line-of-sight environment involving typical residential concrete building, the communications could be established penetrating obstructions to reach above the 11th storey, reaching the performance degradation limits at the 20th storey. Next, the network of the SUN system was proven to be capable of supporting a typical multihop tree network in a dense populated building, meeting the required performance by the standard.

  2. Service differentiated and adaptive CSMA/CA over IEEE 802.15.4 for Cyber-Physical Systems.

    Science.gov (United States)

    Xia, Feng; Li, Jie; Hao, Ruonan; Kong, Xiangjie; Gao, Ruixia

    2013-01-01

    Cyber-Physical Systems (CPS) that collect, exchange, manage information, and coordinate actions are an integral part of the Smart Grid. In addition, Quality of Service (QoS) provisioning in CPS, especially in the wireless sensor/actuator networks, plays an essential role in Smart Grid applications. IEEE 802.15.4, which is one of the most widely used communication protocols in this area, still needs to be improved to meet multiple QoS requirements. This is because IEEE 802.15.4 slotted Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) employs static parameter configuration without supporting differentiated services and network self-adaptivity. To address this issue, this paper proposes a priority-based Service Differentiated and Adaptive CSMA/CA (SDA-CSMA/CA) algorithm to provide differentiated QoS for various Smart Grid applications as well as dynamically initialize backoff exponent according to traffic conditions. Simulation results demonstrate that the proposed SDA-CSMA/CA scheme significantly outperforms the IEEE 802.15.4 slotted CSMA/CA in terms of effective data rate, packet loss rate, and average delay.

  3. Service Differentiated and Adaptive CSMA/CA over IEEE 802.15.4 for Cyber-Physical Systems

    Directory of Open Access Journals (Sweden)

    Feng Xia

    2013-01-01

    Full Text Available Cyber-Physical Systems (CPS that collect, exchange, manage information, and coordinate actions are an integral part of the Smart Grid. In addition, Quality of Service (QoS provisioning in CPS, especially in the wireless sensor/actuator networks, plays an essential role in Smart Grid applications. IEEE 802.15.4, which is one of the most widely used communication protocols in this area, still needs to be improved to meet multiple QoS requirements. This is because IEEE 802.15.4 slotted Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA employs static parameter configuration without supporting differentiated services and network self-adaptivity. To address this issue, this paper proposes a priority-based Service Differentiated and Adaptive CSMA/CA (SDA-CSMA/CA algorithm to provide differentiated QoS for various Smart Grid applications as well as dynamically initialize backoff exponent according to traffic conditions. Simulation results demonstrate that the proposed SDA-CSMA/CA scheme significantly outperforms the IEEE 802.15.4 slotted CSMA/CA in terms of effective data rate, packet loss rate, and average delay.

  4. Performance Comparison of IEEE 802.11e EDCA and 802.11b DCF Under Non-Saturation Condition using Network Simulator

    Directory of Open Access Journals (Sweden)

    G. Prakash

    2012-11-01

    Full Text Available In this study, throughput and delay performance of IEEE 802.11b and 802.11e is presented under non-saturation conditions. In order to improve the performance of IEEE 802.11b, the IEEE 802.11e has been proposed to improve the Quality of Services (QoS for multimedia application. The standard 802.11b CSMA/CA contention mechanism does not support QoS but the standard 802.11e provides QoS by adjustment of MAC parameters. The comparison of 802.11b DCF and 802.11e EDCA mechanism by using Network Simulator (NS-2 with different parameters such as throughput, delay, CWmin and AIFS differentiation are simulated. The EDCA stations have more competitive advantages than 802.11b under all the above parameters. The simulation results show that the proposed algorithm improves the performance of the EDCA stations.

  5. Low-frequency electrical dosimetry: research agenda of the IEEE International Committee on Electromagnetic Safety

    Science.gov (United States)

    Reilly, J. Patrick; Hirata, Akimasa

    2016-06-01

    This article treats unsettled issues in the use of numerical models of electrical dosimetry as applied to international limits on human exposure to low-frequency (typically  electromagnetic fields and contact current. The perspective in this publication is that of Subcommittee 6 of IEEE-ICES (International Committee on Electromagnetic Safety) Technical Committee 95. The paper discusses 25 issues needing attention, fitting into three general categories: induction models; electrostimulation models; and human exposure limits. Of these, 9 were voted as ‘high priority’ by members of Subcommittee 6. The list is presented as a research agenda for refinements in numerical modeling with applications to human exposure limits. It is likely that such issues are also important in medical and electrical product safety design applications.

  6. A Study of IEEE 802.15.4 Security Framework for Wireless Body Area Network

    CERN Document Server

    Saleem, Shahnaz; Kwak, Kyung Sup; 10.3390/s110201383

    2011-01-01

    A Wireless Body Area Network (WBAN) is a collection of low-power and lightweight wireless sensor nodes that are used to monitor the human body functions and the surrounding environment. It supports a number of innovative and interesting applications, including ubiquitous healthcare and Consumer Electronics (CE) applications. Since WBAN nodes are used to collect sensitive (life-critical) information and may operate in hostile environments, they require strict security mechanisms to prevent malicious interaction with the system. In this paper, we first highlight major security requirements and Denial of Service (DoS) attacks in WBAN at Physical, Medium Access Control (MAC), Network, and Transport layers. Then we discuss the IEEE 802.15.4 security framework and identify the security vulnerabilities and major attacks in the context of WBAN. Different types of attacks on the Contention Access Period (CAP) and Contention Free Period (CFP) parts of the superframe are analyzed and discussed. It is observed that a sma...

  7. Indian Vacuum Society: The Indian Vacuum Society

    Science.gov (United States)

    Saha, T. K.

    2008-03-01

    The Indian Vacuum Society (IVS) was established in 1970. It has over 800 members including many from Industry and R & D Institutions spread throughout India. The society has an active chapter at Kolkata. The society was formed with the main aim to promote, encourage and develop the growth of Vacuum Science, Techniques and Applications in India. In order to achieve this aim it has conducted a number of short term courses at graduate and technician levels on vacuum science and technology on topics ranging from low vacuum to ultrahigh vacuum So far it has conducted 39 such courses at different parts of the country and imparted training to more than 1200 persons in the field. Some of these courses were in-plant training courses conducted on the premises of the establishment and designed to take care of the special needs of the establishment. IVS also regularly conducts national and international seminars and symposia on vacuum science and technology with special emphasis on some theme related to applications of vacuum. A large number of delegates from all over India take part in the deliberations of such seminars and symposia and present their work. IVS also arranges technical visits to different industries and research institutes. The society also helped in the UNESCO sponsored post-graduate level courses in vacuum science, technology and applications conducted by Mumbai University. The society has also designed a certificate and diploma course for graduate level students studying vacuum science and technology and has submitted a syllabus to the academic council of the University of Mumbai for their approval, we hope that some colleges affiliated to the university will start this course from the coming academic year. IVS extended its support in standardizing many of the vacuum instruments and played a vital role in helping to set up a Regional Testing Centre along with BARC. As part of the development of vacuum education, the society arranges the participation of

  8. An Improved Cross-Layering Design for IPv6 Fast Handover with IEEE 802.16m Entry Before Break Handover

    Science.gov (United States)

    Kim, Ronny Yongho; Jung, Inuk; Kim, Young Yong

    IEEE 802.16m is an advanced air interface standard which is under development for IMT-Advanced systems, known as 4G systems. IEEE 802.16m is designed to provide a high data rate and a Quality of Service (QoS) level in order to meet user service requirements, and is especially suitable for mobilized environments. There are several factors that have great impact on such requirements. As one of the major factors, we mainly focus on latency issues. In IEEE 802.16m, an enhanced layer 2 handover scheme, described as Entry Before Break (EBB) was proposed and adopted to reduce handover latency. EBB provides significant handover interruption time reduction with respect to the legacy IEEE 802.16 handover scheme. Fast handovers for mobile IPv6 (FMIPv6) was standardized by Internet Engineering Task Force (IETF) in order to provide reduced handover interruption time from IP layer perspective. Since FMIPv6 utilizes link layer triggers to reduce handover latency, it is very critical to jointly design FMIPv6 with its underlying link layer protocol. However, FMIPv6 based on new handover scheme, EBB has not been proposed. In this paper, we propose an improved cross-layering design for FMIPv6 based on the IEEE 802.16m EBB handover. In comparison with the conventional FMIPv6 based on the legacy IEEE 802.16 network, the overall handover interruption time can be significantly reduced by employing the proposed design. Benefits of this improvement on latency reduction for mobile user applications are thoroughly investigated with both numerical analysis and simulation on various IP applications.

  9. PRIORITY BASED UPLINK SCHEDULER FOR IEEE 802.16 NETWORKS

    Directory of Open Access Journals (Sweden)

    Gurpreet Singh,

    2011-06-01

    Full Text Available IEEE 802.16, the standard for fixed, portable and mobile Broadband Wireless Access (BWA systems, is promising to support different classes of traffic with Quality of Service (QoS. The Medium Access Control (MAC protocol defines a wide variety of mechanisms for bandwidth allocation and QoS provision. However, the details of how to schedule traffic are left unspecified. In this paper, we propose ascheduling strategy for uplink traffic. Simulation results show that our scheme is capable to provide required QoS.

  10. 基于IEEE 802.11p车联网安全应用消息传输性能分析%Internet of Vehicles Security Messages Transmission Based on IEEE 802.11p

    Institute of Scientific and Technical Information of China (English)

    段林侠

    2016-01-01

    从车联网安全消息传输性能的角度出发,针对车联网仿真需求,搭建了基于交通仿真软件SUMO和网络仿真软件OMNeT++的车联网仿真平台。在此基础上,对基于IEEE 802.11p协议的车联网中安全应用消息的传输性能进行了仿真与分析。仿真结果表明,IEEE 802.11p协议不能满足车联网中低时延高可靠的服务质量需求。%From the perspective of car security application message transmission performance,this paper aimes at the u-nique requirements of the Internet of Vehicles (IoV) simulation,set the IoV simulation platform based on traffic simulation soft-ware SUMO and network simulation software OMNeT++.Based on that,and analyzes the IoV network system performance based on the IEEE 802.11p protocol.

  11. 基于IEEE1149.7的TAP控制器命令研究%Commands of TAP controller based on IEEE1149.7

    Institute of Scientific and Technical Information of China (English)

    江坤; 高俊强

    2013-01-01

    随着待测芯片的集成度越来越高,IEEE 1149.1标准已很难满足芯片设计对测试与调试的要求.IEEE1149.7标准在保持与IEEE1149.1兼容的基础上增加了新功能,提供了一种全新的双引脚测试与调试方法.目前对IEEE1149.7的研究处于起步阶段,所以研究支持其的控制器命令对今后的发展具有重要的意义.本文在深入研究IEEE 1149.7标准的基础上,利用Quartus Ⅱ开发平台设计了基于TAP控制器命令的测试控制器,并进行了仿真验证.结果表明产生的命令测试信号符合IEEE 1149.7标准对TAP控制器命令的规定.%With the increasing integration of test chip,IEEE 1149.1 has been difficult to meet the requirements of the chip testing and designing.Being compatible with IEEE 1149.1,IEEE 1149.7 provides a new two-pin test and debug methods.Because IEEE 1149.7 is still in the initial stage,to study its commands of controller is of great significance on the future development of IEEE 1149.7.This paper is based on the deep study of IEEE 1149.7 standard,to design a test controller based on the commands of TAP controller by using QuartusⅡ platform and perform simulation verification.The result shows that the test signal generated by the controller can meet the requirements of IEEE 1149.7.

  12. Extending Service Area of IEEE 802.11 Ad Hoc Networks

    Science.gov (United States)

    Choi, Woo-Yong

    2012-06-01

    According to the current IEEE 802.11 wireless LAN standards, IEEE 802.11 ad hoc networks have the limitation that all STAs (Stations) are in the one-hop transmission range of each other. In this paper, to alleviate the limitation of IEEE 802.11 ad hoc networks we propose the efficient method for selecting the most appropriate pseudo AP (Access Point) from among the set of ad hoc STAs and extending the service area of IEEE 802.11 ad hoc networks by the pseudo AP's relaying the internal traffic of IEEE 802.11 ad hoc networks. Numerical examples show that the proposed method significantly extends the service area of IEEE 802.11 ad hoc networks.

  13. A Study of IEEE 802.15.4 Security Framework for Wireless Body Area Networks

    Directory of Open Access Journals (Sweden)

    Kyung Sup Kwak

    2011-01-01

    Full Text Available A Wireless Body Area Network (WBAN is a collection of low-power and lightweight wireless sensor nodes that are used to monitor the human body functions and the surrounding environment. It supports a number of innovative and interesting applications, including ubiquitous healthcare and Consumer Electronics (CE applications. Since WBAN nodes are used to collect sensitive (life-critical information and may operate in hostile environments, they require strict security mechanisms to prevent malicious interaction with the system. In this paper, we first highlight major security requirements and Denial of Service (DoS attacks in WBAN at Physical, Medium Access Control (MAC, Network, and Transport layers. Then we discuss the IEEE 802.15.4 security framework and identify the security vulnerabilities and major attacks in the context of WBAN. Different types of attacks on the Contention Access Period (CAP and Contention Free Period (CFP parts of the superframe are analyzed and discussed. It is observed that a smart attacker can successfully corrupt an increasing number of GTS slots in the CFP period and can considerably affect the Quality of Service (QoS in WBAN (since most of the data is carried in CFP period. As we increase the number of smart attackers the corrupted GTS slots are eventually increased, which prevents the legitimate nodes to utilize the bandwidth efficiently. This means that the direct adaptation of IEEE 802.15.4 security framework for WBAN is not totally secure for certain WBAN applications. New solutions are required to integrate high level security in WBAN.

  14. A study of IEEE 802.15.4 security framework for wireless body area networks.

    Science.gov (United States)

    Saleem, Shahnaz; Ullah, Sana; Kwak, Kyung Sup

    2011-01-01

    A Wireless Body Area Network (WBAN) is a collection of low-power and lightweight wireless sensor nodes that are used to monitor the human body functions and the surrounding environment. It supports a number of innovative and interesting applications, including ubiquitous healthcare and Consumer Electronics (CE) applications. Since WBAN nodes are used to collect sensitive (life-critical) information and may operate in hostile environments, they require strict security mechanisms to prevent malicious interaction with the system. In this paper, we first highlight major security requirements and Denial of Service (DoS) attacks in WBAN at Physical, Medium Access Control (MAC), Network, and Transport layers. Then we discuss the IEEE 802.15.4 security framework and identify the security vulnerabilities and major attacks in the context of WBAN. Different types of attacks on the Contention Access Period (CAP) and Contention Free Period (CFP) parts of the superframe are analyzed and discussed. It is observed that a smart attacker can successfully corrupt an increasing number of GTS slots in the CFP period and can considerably affect the Quality of Service (QoS) in WBAN (since most of the data is carried in CFP period). As we increase the number of smart attackers the corrupted GTS slots are eventually increased, which prevents the legitimate nodes to utilize the bandwidth efficiently. This means that the direct adaptation of IEEE 802.15.4 security framework for WBAN is not totally secure for certain WBAN applications. New solutions are required to integrate high level security in WBAN.

  15. White Paper of the Society of Computed Body Tomography and Magnetic Resonance on Dual-Energy CT, Part 3: Vascular, Cardiac, Pulmonary, and Musculoskeletal Applications.

    Science.gov (United States)

    De Cecco, Carlo N; Schoepf, U Joseph; Steinbach, Lynne; Boll, Daniel T; Foley, W Dennis; Kaza, Ravi K; Bolus, David N; Morgan, Desiree E; Sahani, Dushyant V; Shuman, William P; Siegel, Marilyn J; Vrtiska, Terri J; Yeh, Benjamin M; Berland, Lincoln L

    2017-01-01

    This is the third of a series of 4 white papers that represent Expert Consensus Documents developed by the Society of Computed Body Tomography and Magnetic Resonance through its Task Force on dual-energy computed tomography. This paper, part 3, describes computed tomography angiography and thoracic, cardiac, vascular, and musculoskeletal clinical applications. At the end of the discussion of each application category (vascular, cardiac, pulmonary, and musculoskeletal), we present our consensus opinions on the current clinical utility of the application and opportunities for further research.

  16. Performance Analysis of IEEE 802.15.6 CSMA/CA Protocol for WBAN Medical Scenario through DTMC Model.

    Science.gov (United States)

    Kumar, Vivek; Gupta, Bharat

    2016-12-01

    The newly drafted IEEE 802.15.6 standard for Wireless Body Area Networks (WBAN) has been concentrating on a numerous medical and non-medical applications. Such short range wireless communication standard offers ultra-low power consumption with variable data rates from few Kbps to Mbps in, on or around the proximity of the human body. In this paper, the performance analysis of carrier sense multiple access with collision avoidance (CSMA/CA) scheme based on IEEE 802.15.6 standard in terms of throughput, reliability, clear channel assessment (CCA) failure probability, packet drop probability, and end-to-end delay has been presented. We have developed a discrete-time Markov chain (DTMC) to significantly evaluate the performances of IEEE 802.15.6 CSMA/CA under non-ideal channel condition having saturated traffic condition including node wait time and service time. We also visualize that, as soon as the payload length increases the CCA failure probability increases, which results in lower node's reliability. Also, we have calculated the end-to-end delay in order to prioritize the node wait time cause by backoff and retransmission. The user priority (UP) wise DTMC analysis has been performed to show the importance of the standard especially for medical scenario.

  17. Wireless Coexistence between IEEE 802.11- and IEEE 802.15.4-Based Networks: A Survey

    OpenAIRE

    2011-01-01

    As more and more wireless devices use the 2.4 GHz radio spectrum, the coexistence of 2.4 GHz wireless devices operating in one place has become a hot topic. With low transmit power, the widely deployed IEEE 802.15.4-based networks are easily interfered with by other 2.4 GHz wireless networks, such as IEEE 802.11. IEEE 802.15.4-based wireless networks have paid great attention to the coexistence between themselves and with other non-IEEE 802.15.4 wireless networks. This problem has been furthe...

  18. Vulnerability and Attack of Routing Protocol in IEEE 802.11s%IEEE802.11s路由协议漏洞与攻击

    Institute of Scientific and Technical Information of China (English)

    杜尚鑫; 易平; 罗庆华

    2012-01-01

    IEEE802.11s是IEEE关于无线Mesh网络的规范。802.1ls虽然沿用了IEEE802.11i的安全规范,但是对于路由协议的安全并没有做过多的定义,由此产生了一定的安全隐患。文章分析了IEEE802.11s标准f草案)中的路由协议的漏洞,并针对IEEE802.1ls中使用的混合无线网状网协议(Hybrid WirelessMesh Protocol,HWMP)设计了两种攻击方式,从而破坏无线网状网络的可用性。通过在自行设计的路由器平台上实现无线攻击,并分析攻击对网络造成的影响来验证安全漏洞的存在性和可利用性。%IEEE802.1 l s is the IEEE specification of wireless Mesh network. Although 802.11s follows the IEEE 802.11i security specification, there is no much specification for routing protocol security. The routing protocol vulnerabilities in IEEE802.1 Is standard(draft) are analyzed, and two kinds of attacks aiming at HWMP(Hybrid Wireless Mesh Protocol) routing protocol used in the IEEE 802.11s are designed, thus to undermine the availability of wireless Mesh network. This paper analyzes the impact of attacks on wireless network and tells of the existence and utilizability of security vulnerability.

  19. Capacity and performance study of IEEE 802.11e in WLANs and ad hoc networks

    OpenAIRE

    Mjøberg, Frank Roar

    2007-01-01

    This master thesis focuses on the IEEE 802.11e Enhanced Distribution Channel Access (EDCA). The IEEE 802.11e protocol became an IEEE standard in November 2005 and is a very popular research topic. Even though the protocol has been tested for faults and errors a long time there are still research topics to explore. This thesis will try to answer some of those topics. The main topic in this thesis is how the IEEE 802.11e MAC operates in a multihop ad hoc network. We discuss and evaluated th...

  20. Capacity and performance study of IEEE 802.11e in WLANs and ad hoc networks

    OpenAIRE

    Mjøberg, Frank Roar

    2007-01-01

    This master thesis focuses on the IEEE 802.11e Enhanced Distribution Channel Access (EDCA). The IEEE 802.11e protocol became an IEEE standard in November 2005 and is a very popular research topic. Even though the protocol has been tested for faults and errors a long time there are still research topics to explore. This thesis will try to answer some of those topics. The main topic in this thesis is how the IEEE 802.11e MAC operates in a multihop ad hoc network. We discuss and evaluated th...

  1. IEEE 802.11 5GHz标准物理层研究

    Institute of Scientific and Technical Information of China (English)

    潘翔; 欧阳红升; 高泽华; 高峰

    2013-01-01

    IEEE 802.115GHz技术标准及相关设备的逐步成熟,使得5GHz WLAN网络建设成为可能.文章研究并分析了IEEE 802.11a、IEEE 802.11n、IEEE 802.11ac等5GHz WLAN标准的技术发展路径,并对其物理层关键技术及各标准所支持的最高数据速率作了重点分析.

  2. Coexistence of IEEE 802.11b/g WLANs and IEEE 802.15.4 WSNs: Modeling and Protocol Enhancements

    OpenAIRE

    Yuan, W.

    2011-01-01

    As an emerging short-range wireless technology, IEEE 802.15.4/ZigBee Wireless Sensor Networks (WSNs) are increasingly used in the fields of home control, industrial control, consumer electronics, energy management, building automation, telecom services, personal healthcare, etc. IEEE 802.15.4/Zig-Bee WSNs share the same 2.4 GHz license-free Industrial, Scientific, and Medical (ISM) band with many other wireless systems such as IEEE 802.11b/g WLANs, Bluetooth, cordless phones, etc. Due to the ...

  3. Coexistence of IEEE 802.11b/g WLANs and IEEE 802.15.4 WSNs: Modeling and Protocol Enhancements

    OpenAIRE

    Yuan, W.

    2011-01-01

    As an emerging short-range wireless technology, IEEE 802.15.4/ZigBee Wireless Sensor Networks (WSNs) are increasingly used in the fields of home control, industrial control, consumer electronics, energy management, building automation, telecom services, personal healthcare, etc. IEEE 802.15.4/Zig-Bee WSNs share the same 2.4 GHz license-free Industrial, Scientific, and Medical (ISM) band with many other wireless systems such as IEEE 802.11b/g WLANs, Bluetooth, cordless phones, etc. Due to the ...

  4. Implementation of CRC in IEEE1394 Based on Verilog HDL%基于Verilog HDL的IEEE1394协议中CRC校验的实现

    Institute of Scientific and Technical Information of China (English)

    张艳; 李现国

    2009-01-01

    CRC是IEEE1394协议中重要的错误检测和恢复机制.介绍循环冗余校验的基本原理,根据IEEE1394协议中CRC码的产生原理,分析CRC校验的具体计算过程,讨论IEEE1394协议中CRC的FPGA实现.借助EDA工具和Verilog HDL语言实现了对这种算法的仿真和验证.

  5. IEEE-PSES中国首届研讨会在京举行%IEEE PSES first seminar was held in Beijing

    Institute of Scientific and Technical Information of China (English)

    郝丽娟

    2010-01-01

    @@ 近日,IEEE-PSES(电气电子工程师学会,产品安全工程师分会)中国首届研讨会在京举行.本次会议由IEEE-PSES主办,中国质量认证中心(CQC)承办.来自IEEE-PSES、IECTC108及检测、认证等相关行业的有关领导和专家共计百余人出席了本次会议.

  6. Network Society

    DEFF Research Database (Denmark)

    Clausen, Lars; Tække, Jesper

    2017-01-01

    the five strands of theory on the network society. Each theoretical position has its specific implications for acting toward strategic goals. In its entirety, the five perspectives give a thorough understanding of the conditions for successful strategic communication in the 21st century....

  7. IEEE 802.11p Empirical Performance Model from Evaluations on Test Tracks

    Directory of Open Access Journals (Sweden)

    Sébastien Demmel

    2014-06-01

    Full Text Available IEEE 802.11p is the new standard for intervehicular communications (IVC using the 5.9 GHz frequency band; it is planned to be widely deployed to enable cooperative systems. 802.11p uses and performance have been studied theoretically and in simulations over the past years. Unfortunately, many of these results have not been confirmed by on-tracks experimentation. In this paper, we describe field trials of 802.11p technology with our test vehicles; metrics such as maximum range, latency and frame loss are examined. Then, we propose a detailed modelisation of 802.11p that can be used to accurately simulate its performance within Cooperative Systems (CS applications.

  8. Design and Implementation of a Testbed for IEEE 802.15.4 (Zigbee Performance Measurements

    Directory of Open Access Journals (Sweden)

    Patrick R. Casey

    2010-01-01

    Full Text Available IEEE 802.15.4, commonly known as ZigBee, is a Media Access Control (MAC and physical layer standard specifically designed for short range wireless communication where low rate, low power, and low bandwidth are required. This makes ZigBee an ideal choice when it comes to sensor networks for monitoring data collection and/or triggering process responses. However, these very characteristics bring into question ZigBee's ability to perform reliably in harsh environments. This paper thoroughly explains the experimental testbed setup and execution to demonstrate ZigBee's performance in several practical applications. This testbed is capable of measuring the minimum, maximum, and average received signal strength indicator (RSSI, bit error rate (BER, packet error rate (PER, packet loss rate (PLR, and the bit error locations. Results show that ZigBee has the potential capabilities to be used in all four tested environments.

  9. A Fair and Efficient Packet Scheduling Scheme for IEEE 802.16 Broadband Wireless Access Systems

    CERN Document Server

    Chowdhury, Prasun; 10.5121/ijasuc.2010.1308

    2010-01-01

    This paper proposes a fair and efficient QoS scheduling scheme for IEEE 802.16 BWA systems that satisfies both throughput and delay guarantee to various real and non-real time applications. The proposed QoS scheduling scheme is compared with an existing QoS scheduling scheme proposed in literature in recent past. Simulation results show that the proposed scheduling scheme can provide a tight QoS guarantee in terms of delay, delay violation rate and throughput for all types of traffic as defined in the WiMAX standard, thereby maintaining the fairness and helps to eliminate starvation of lower priority class services. Bandwidth utilization of the system and fairness index of the resources are also encountered to validate the QoS provided by our proposed scheduling scheme.

  10. 3th IEEE/ACIS International Conference on Computer and Information Science

    CERN Document Server

    2015-01-01

    This edited book presents scientific results of the 13th IEEE/ACIS International Conference on Computer and Information Science (ICIS 2014) which was held on June 4-6, 2014 in Taiyuan, China. The aim of this conference was to bring together researchers and scientists, businessmen and entrepreneurs, teachers, engineers, computer users, and students to discuss the numerous fields of computer science and to share their experiences and exchange new ideas and information in a meaningful way. Research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them. The conference organizers selected the best papers from those papers accepted for presentation at the conference.  The papers were chosen based on review scores submitted by members of the program committee, and underwent further rigorous rounds of review. This publication captures 14 of the conference’s most promis...

  11. 12th ACIS/IEEE International Conference on Computer Science and Information Science

    CERN Document Server

    2013-01-01

    This edited book presents scientific results of the 12th IEEE/ACIS International Conference on Computer and Information Science (ICIS 2013) which was held on June 16-20, 2013 in Toki Messe, Niigata, Japan. The aim of this conference was to bring together scientists, engineers, computer users, and students to share their experiences and exchange new ideas, research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them The conference organizers selected the best 20 papers from those papers accepted for presentation at the conference. The papers were chosen based on review scores submitted by members of the program committee, and underwent further rigorous rounds of review.    

  12. Development of a low mobility IEEE 802.15.4 compliant VANET system for urban environments.

    Science.gov (United States)

    Nazabal, Juan Antonio; Falcone, Francisco; Fernández-Valdivielso, Carlos; Matías, Ignacio Raúl

    2013-05-29

    The use of Vehicular Ad-Hoc Networks (VANETs) is growing nowadays and it includes both roadside-to-vehicle communication (RVC) and inter-vehicle communication (IVC). The purpose of VANETs is to exchange useful information between vehicles and the roadside infrastructures for making an intelligent use of them. There are several possible applications for this technology like: emergency warning system for vehicles, cooperative adaptive cruise control or collision avoidance, among others. The objective of this work is to develop a VANET prototype system for urban environments using IEEE 802.15.4 compliant devices. Simulation-based values of the estimated signal strength and radio link quality values are obtained and compared with measurements in outdoor conditions to validate an implemented VANET system. The results confirm the possibility of implementing low cost vehicular communication networks operating at moderate vehicular speeds.

  13. Comparison of application of 2013 ACC/AHA guideline and 2011 European Society of Cardiology guideline for the management of dyslipidemias for primary prevention in a Turkish cohort

    OpenAIRE

    Y?lmaz, Mustafa; Atar, ?lyas; Has?rc?, Senem; Akyol, Kadirhan; Tekin, Abdullah; Kara?a?lar, Emir; ?ift?i, Or?un; M?derriso?lu, Haldun

    2016-01-01

    Objective: Atherosclerotic cardiovascular disease is a major global cause of death. The common approach in primary prevention of cardiovascular disease is to identify patients at high risk for cardiovascular disease. This article analyzes and compares the application of 2013 American College of Cardiology/American Heart Association (ACC/AHA) guideline and the 2011 European Society of Cardiology (ESC) guideline for the management of dyslipidemias for primary prevention in Turkish population. M...

  14. Benefits of IEEE-754 features in modern symmetric tridiagonaleigensolvers

    Energy Technology Data Exchange (ETDEWEB)

    Marques, Osni; Riedy, Jason E.; Vomel, Christof

    2006-03-12

    Bisection is one of the most common methods used to compute the eigenvalues of symmetric tridiagonal matrices. Bisection relies on the Sturm count: For a given shift a, the number of negative pivots in the factorization T - {sigma}I = LDL{sup T} equals the number of eigenvalues of T that are smaller than a. In IEEE-754 arithmetic, the value oo permits the computation to continue past a zero pivot, producing a correct Sturm count when T is unreduced. Demmel and Li showed that using oo rather than testing for zero pivots within the loop could significantly improve performance on certain architectures. When eigenvalues are to be computed to high relative accuracy, it is often preferable to work with LDL{sup T} factorizations instead of the original tridiagonal T. One important example is the MRRR algorithm. When bisection is applied to the factored matrix, the Sturm count is computed from LDL{sup T} which makes differential stationary and progressive qds algorithms the methods of choice. While it seems trivial to replace T by LDL{sup T}, in reality these algorithms are more complicated: In IEEE-754 arithmetic, a zero pivot produces an overflow followed by an invalid exception (NaN, or 'Not a Number') that renders the Sturm count incorrect. We present alternative, safe formulations that are guaranteed to produce the correct result. Benchmarking these algorithms on a variety of platforms shows that the original formulation without tests is always faster provided that no exception occurs. The transforms see speed-ups of up to 2.6x over the careful formulations. Tests on industrial matrices show that encountering exceptions in practice is rare. This leads to the following design: First, compute the Sturm count by the fast but unsafe algorithm. Then, if an exception occurs, recompute the count by a safe, slower alternative. The new Sturm count algorithms improve the speed of bisection by up to 2x on our test matrices. Furthermore, unlike the traditional tiny

  15. 20 kV, 2 cm2, 4H-SIC Gate Turn-Off Thyristors for Advanced Pulsed Power Applications

    Science.gov (United States)

    2013-06-01

    diode, the SiC GTO and SiC PiN diode based converter can improve the efficiency by 1% at room-temperature and more than 6% at 200C for an HVDC interface...Models for HVDC Converter”, IEEE Industry Applications Society Annual Meeting (IAS 2004), Oct 3-7, 2004, Seattle, Washington. [5] S. Ryu, C. Capell, C

  16. International Epidemiology of Child and Adolescent Psychopathology II: Integration and Applications of Dimensional Findings from 44 Societies

    Science.gov (United States)

    Rescorla, Leslie; Ivanova, Masha Y.; Achenbach, Thomas M.; Begovac, Ivan; Chahed, Myriam; Drugli, May Britt; Emerich, Deisy Ribas; Fung, Daniel S. S.; Haider, Mariam; Hansson, Kjell; Hewitt, Nohelia; Jaimes, Stefanny; Larsson, Bo; Maggiolini, Alfio; Markovic, Jasminka; Mitrovic, Dragan; Moreira, Paulo; Oliveira, Joao Tiago; Olsson, Martin; Ooi, Yoon Phaik; Petot, Djaouida; Pisa, Cecilia; Pomalima, Rolando; da Rocha; Marina Monzani; Rudan, Vlasta; Sekulic, Slobodan; Shahini, Mimoza; de Mattos Silvares, Edwiges Ferreira; Szirovicza, Lajos; Valverde, Jose; Vera, Luis Anderssen; Villa, Maria Clara; Viola, Laura; Woo, Bernadine S. C.; Zhang, Eugene Yuqing

    2012-01-01

    Objective: To build on Achenbach, Rescorla, and Ivanova (2012) by (a) reporting new international findings for parent, teacher, and self-ratings on the Child Behavior Checklist, Youth Self-Report, and Teacher's Report Form; (b) testing the fit of syndrome models to new data from 17 societies, including previously underrepresented regions; (c)…

  17. 基于IEEE P1687的可变扫描链设计%Design of Flexible Scan-chain Based on IEEE P1687

    Institute of Scientific and Technical Information of China (English)

    刘洋; 颜学龙

    2012-01-01

    在系统芯片SoC中,嵌入式仪器的应用越来越广泛;如何利用已经获得广泛应用的IEEE 1149.1测试访问端口(TAP)实现对嵌入式仪器的访问成为一个新的问题;IEEE P1687 (IJTAG)建议标准提供了一个连接TAP与片上嵌入式仪器的界面标准;其特点是在扫描链中插入SIB使得在嵌入式仪器网络设计和嵌入式仪器的访问中扫描链具有灵活可变的特性;介绍了IEEE P1687标准,分析了IEEE 1149.1在嵌入式仪器访问应用中的缺点及IEEE P1687的优势,并设计实现了SIB的功能,给出了P1687的单层与多层网络结构,并对所需功能进行了仿真验证证明方案可行.%In the testing of .system on chips (SoC) , Embedded instrument are becoming more widely used in test, debug and monitoring. How to use the widespread IEEE 1149. 1 Standard Test Access Port as the interface for accessing embedded instrument becomes a new issue. The IEEE P1687 (IJTAG) standard proposal aims at providing a standardized interface between the IEEE Standard 1149. 1 test access port (TAP) and on -chip embedded instrument. A key feature in P1687 is to include Segment Insertion Bits (SIBs) in the scan-path to allow flexibility both in designing the instrument access network and in scheduling the access to instruments. This paper presents the IEEE P1687 standard, analyses the background of IEEE 1149. 1 and prior work of IEEE P1687, designed the SIB, the flat and hierarchical architecture.

  18. 利用CSP方法对IEEE802.11w形式化分析%Using CSP for formal analysis of IEEE 802.11w protocol

    Institute of Scientific and Technical Information of China (English)

    吴名欢; 程小辉; 李雄伟

    2015-01-01

    IEEE 802.11w authentication protocol based on the IEEE 802.11i enhances the IEEE 802.11i security for man-agement frames.In order to study the safety of the protocol, this paper modeled the protocol by formal analysis using communi-cating sequential processes (CSP ).This paper chosed the role of protocol and the attacker for modelling and verification.It used CSP for modelling and performed the verification using FDR.In the experiments, it found an attack in this protocol.It checked authentication and security attributes and discovered the middleman attack case.It can provide a reference to improve the safety of IEEE 802.11w help.%运行在 IEEE 802.11i 基础上的 IEEE 802.11w 增加了对无线网络管理帧的保护,针对 IEEE 802.11w 协议的安全性问题,利用了通信顺序进程(CSP)对其进行形式化分析。对协议运行在恶意环境中,存在攻击者的情况下,利用 CSP 方法建立了攻击者和协议主体的 CSP 进程模型。使用模型检测工具故障发散改进器(FDR)进行仿真实验,对协议的认证和安全属性进行了校验,发现该协议存在中间人攻击情况,为提高 IEEE 802.11w的安全性提供了帮助。

  19. WIH-based IEEE 802.11 ECG monitoring implementation.

    Science.gov (United States)

    Moein, A; Pouladian, M

    2007-01-01

    New wireless technologies make possible the implementation of high level integration wireless devices which allow the replacement of traditional large wired monitoring devices. It offers new functionalities to physicians and will reduce the costs. Among these functionalities, biomedical signals can be sent to other devices (PDA, PC . . . ) or processing centers, without restricting the patients' mobility. This article discusses the WIH (Ward-In-Hand) structure and the software required for its implementation before an operational example is presented with its results. The aim of this project is the development and implementation of a reduced size electrocardiograph based on IEEE 802.11 with high speed and more accuracy, which allows wireless monitoring of patients, and the insertion of the information into the Wi-Fi hospital networks.

  20. IEEE 802.11 Wireless LAN Security White Paper

    Energy Technology Data Exchange (ETDEWEB)

    King, J

    2001-10-22

    Given the increased productivity and growing popularity of wireless communications in general, and wireless data communications in particular, this paper outlines the protocols, security implications, and architectures of IEEE Std. 802.11-1999 wireless LANs (WLANs) and makes recommendations regarding a phased implementation of WLANs at LLNL. This project is driven by the need for convenient and secure access to the Internet for Laboratory visitors and to the internal network for Laboratory employees. A solid architecture designed with a priority on security will allow LLNL to offer network access in areas where it is traditionally hard to deploy wired networks. It will also enable such services as wireless access for inventory control and convenient network access for conference rooms around LLNL. Wireless network access has the potential to increase productivity by enabling instant access to information.

  1. Basic security measures for IEEE 802.11 wireless networks

    Directory of Open Access Journals (Sweden)

    Oscar P. Sarmiento

    2010-05-01

    Full Text Available This article presents a tutorial/discussion of three commonly-used IEEE 802.11 wireless network security standards: WEP, WPA and WPA2. A detailed analysis of the RC4 algorithm supporting WEP is presented, including its vulnera-bilities. The WPA and WPA2 encryption protocols’ most relevant aspects and technical characteristics are reviewed for a comparative analysis of the three standards in terms of the security they provide. Special attention has been paid to WEP encryption by using an educational simulation tool written in C++ Builder for facilitating the unders-tanding of this protocol at academic level. Two practical cases of wireless security configurations using Cisco net-working equipment are also presented: configuring and enabling WPA-Personal and WPA2-Personal (these being security options used by TKIP and AES, respectively.

  2. Review of the IEEE Standard for Computerized Operating Procedure Systems

    Energy Technology Data Exchange (ETDEWEB)

    O' Hara, J.; Higgins, J.

    2010-02-26

    Increasingly nuclear power plant procedures, such as emergency operating procedures, are being presented in computer form with functionality to support operator use and management of the procedures. The U.S. Nuclear Regulatory Commission (NRC) currently has guidance for the review of computer-based procedures (CBPs); however, there remain CBP functions and human performance issues for which up-to-date guidance is lacking. The Institute of Electrical and Electronics Engineers (IEEE) has initiated a standard development effort to address the human factors engineering (HFE) aspects of CBP systems. When completed, it may provide guidance to supplement the NRC staff's review criteria. The purpose of our study was to evaluate the suitability of the IEEE Standard for use in the NRC's HFE safety reviews of CBP systems and to ensure that the guidance meets the NRC's standard for scientific and engineering rigor used in its own guidance development efforts. We established the following criteria with which to evaluate the Standard: (1) it should meet an existing need of NRC reviewers, (2) it should be based in sound HFE principles, (3) it should be thoroughly peer-reviewed, and (4) it should address CBP-related human performance issues identified in the literature. This report describes the methodology we used to evaluate each criterion. Our evaluation concluded that the Standard generally does meet these criteria, however several areas were identified for which additional clarifications are needed. Thus consideration of the Standard's use by the NRC is supported. The standard evaluation methodology developed in this study can be generally applied to the review of other HFE standards being considered for possible use or endorsement by the NRC.

  3. 基于IEEE 1588时间同步系统的硬件实现%Hardware Implementation of Time Synchronization System Based on IEEE 1588

    Institute of Scientific and Technical Information of China (English)

    曹禹; 邹磊; 时维铎; 周国平

    2013-01-01

      IEEE 1588是关于网络测量和控制系统的高精度时间协议标准,其时间同步精度能够达到次微秒级。首先分析了IEEE 1588时间同步原理,然后以LPC1768+DP83640的硬件结构实现了IEEE 1588时间同步系统,最后利用示波器测试了主从时钟的时间同步精度。设计结果表明可以满足当今电力系统对高精度时间同步的要求。%IEEE 1588 is a high precision time protocol standards about network measurement and control system, its time synchronization precision can reach sub-microsecond level. This paper first analyzes the principle of IEEE 1588 time synchronization, then realizes the IEEE 1588 time synchronization system with LPC1768 +DP83640. Finally, uses the oscilloscope to test the master -slave clock time synchronization precision. Its results show that it can meet the need of the current electric power system to realize high accuracy time synchronization.

  4. DEVELOPMENT OF A METHOD TO DESIGN A LOW-CARBON SOCIETY IN SMALL COMMUNITY AND ITS APPLICATION TO PUTRAJAYA, MALAYSIA

    Science.gov (United States)

    Hayashi, Yuri; Simson, Janice. J.; Gomi, Kei; Matsuoka, Yuzuru

    In this study, we developed the method to design Low-carbon society for small communities almost without industry, with regarding of costs for countermeasures. Then we applied it to Putrajaya, Malaysia, and estimate Socio-economic indicators, energy demand, CO2 emission in year 2007 and 2025. For countermeasure case in 2025, we set three cases according to their priority; Transport, Renewable energy, Building, and calculated costs for countermeasures also. As a result, it was shown that it is possible to reduce 45% of CO2 emission by 2025 compared to 2007 level. Renewable energy priority case needs the highest cost, and Building and Transport was estimated to be the second and third highest. C-ExSS will help more realistic discussion on the policy and countermeasures for developing low-carbon society based on their costs.

  5. Cryptozoology Society

    Science.gov (United States)

    Richman, Barbara T.

    Reports of Loch Ness monsters, Bigfoot, and the Yeti spring u p from time to time, sparking scientific controversy about the veracity of these observations. Now an organization has been established to help cull, analyze, and disseminate information on the alleged creatures. The International Society of Cryptozoology, formed at a January meeting at the U.S. National Museum of Natural History of the Smithsonian Institution, will serve as the focal point for the investigation, analysis, publication, and discussion of animals of unexpected form or size or of unexpected occurrences in time or space.

  6. Standard-compliant real-time transmission of ECGs: harmonization of ISO/IEEE 11073-PHD and SCP-ECG.

    Science.gov (United States)

    Trigo, Jesús D; Chiarugi, Franco; Alesanco, Alvaro; Martínez-Espronceda, Miguel; Chronaki, Catherine E; Escayola, Javier; Martínez, Ignacio; García, José

    2009-01-01

    Ambient assisted living and integrated care in an aging society is based on the vision of the lifelong Electronic Health Record calling for HealthCare Information Systems and medical device interoperability. For medical devices this aim can be achieved by the consistent implementation of harmonized international interoperability standards. The ISO/IEEE 11073 (x73) family of standards is a reference standard for medical device interoperability. In its Personal Health Device (PHD) version several devices have been included, but an ECG device specialization is not yet available. On the other hand, the SCP-ECG standard for short-term diagnostic ECGs (EN1064) has been recently approved as an international standard ISO/IEEE 11073-91064:2009. In this paper, the relationships between a proposed x73-PHD model for an ECG device and the fields of the SCP-ECG standard are investigated. A proof-of-concept implementation of the proposed x73-PHD ECG model is also presented, identifying open issues to be addressed by standards development for the wider interoperability adoption of x73-PHD standards.

  7. Performance Analysis of IEEE 802.11 DCF and IEEE 802.11e EDCA in Non-saturation Condition

    Science.gov (United States)

    Kim, Tae Ok; Kim, Kyung Jae; Choi, Bong Dae

    We analyze the MAC performance of the IEEE 802.11 DCF and 802.11e EDCA in non-saturation condition where device does not have packets to transmit sometimes. We assume that a flow is not generated while the previous flow is in service and the number of packets in a flow is geometrically distributed. In this paper, we take into account the feature of non-saturation condition in standards: possibility of transmission performed without preceding backoff procedure for the first packet arriving at the idle station. Our approach is to model a stochastic behavior of one station as a discrete time Markov chain. We obtain four performance measures: normalized channel throughput, average packet HoL (head of line) delay, expected time to complete transmission of a flow and packet loss probability. Our results can be used for admission control to find the optimal number of stations with some constraints on these measures.

  8. Impact of LQI-Based Routing Metrics on the Performance of a One-to-One Routing Protocol for IEEE 802.15.4 Multihop Networks

    Directory of Open Access Journals (Sweden)

    Boix Antoni

    2010-01-01

    Full Text Available The quality of an IEEE 802.15.4 link can be estimated on the basis of the Link Quality Indication (LQI, which is a parameter offered by the IEEE 802.15.4 physical layer. The LQI has been recommended by organizations such as the ZigBee Alliance and the IETF as an input to routing metrics for IEEE 802.15.4 multihop networks. As these networks evolve, one-to-one communications gain relevance in many application areas. In this paper, we present an in-depth, experimental study on the impact of LQI-based routing metrics on the performance of a one-to-one routing protocol for IEEE 802.15.4 multihop networks. We conducted our experiments in a 60-node testbed. Experiments show the spectrum of performance results that using (or not the LQI may yield. Results also highlight the importance of the additive or multiplicative nature of the routing metrics and its influence on performance.

  9. 15th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing

    CERN Document Server

    2015-01-01

    This edited book presents scientific results of 15th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2014) held on June 30 – July 2, 2014 in Las Vegas Nevada, USA. The aim of this conference was to bring together scientists, engineers, computer users, and students to share their experiences and exchange new ideas, research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them. The conference organizers selected the 13 outstanding papers from those papers accepted for presentation at the conference.

  10. 14th ACIS/IEEE International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing

    CERN Document Server

    Studies in Computational Intelligence : Volume 492

    2013-01-01

    This edited book presents scientific results of the 14th ACIS/IEEE International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2013), held in Honolulu, Hawaii, USA on July 1-3, 2013. The aim of this conference was to bring together scientists, engineers, computer users, and students to share their experiences and exchange new ideas, research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them. The conference organizers selected the 17 outstanding papers from those papers accepted for presentation at the conference.  

  11. Improving the communication reliability of body sensor networks based on the IEEE 802.15.4 protocol.

    Science.gov (United States)

    Gomes, Diogo; Afonso, José A

    2014-03-01

    Body sensor networks (BSNs) enable continuous monitoring of patients anywhere, with minimum constraints to daily life activities. Although the IEEE 802.15.4 and ZigBee(®) (ZigBee Alliance, San Ramon, CA) standards were mainly developed for use in wireless sensors network (WSN) applications, they are also widely used in BSN applications because of device characteristics such as low power, low cost, and small form factor. However, compared with WSNs, BSNs present some very distinctive characteristics in terms of traffic and mobility patterns, heterogeneity of the nodes, and quality of service requirements. This article evaluates the suitability of the carrier sense multiple access-collision avoidance protocol, used by the IEEE 802.15.4 and ZigBee standards, for data-intensive BSN applications, through the execution of experimental tests in different evaluation scenarios, in order to take into account the effects of contention, clock drift, and hidden nodes on the communication reliability. Results show that the delivery ratio may decrease substantially during transitory periods, which can last for several minutes, to a minimum of 90% with retransmissions and 13% without retransmissions. This article also proposes and evaluates the performance of the BSN contention avoidance mechanism, which was designed to solve the identified reliability problems. This mechanism was able to restore the delivery ratio to 100% even in the scenario without retransmissions.

  12. 48 CFR 52.223-16 - IEEE 1680 Standard for the Environmental Assessment of Personal Computer Products.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 2 2010-10-01 2010-10-01 false IEEE 1680 Standard for the... CONTRACT CLAUSES Text of Provisions and Clauses 52.223-16 IEEE 1680 Standard for the Environmental Assessment of Personal Computer Products. As prescribed in 23.706(b)(1), insert the following clause: IEEE...

  13. Women in biomedical engineering and health informatics and its impact on gender representation for accepted publications at IEEE EMBC 2007.

    Science.gov (United States)

    McGregor, Carolyn; Smith, Kathleen P; Percival, Jennifer

    2008-01-01

    The study of women within the professions of Engineering and Computer Science has consistently been found to demonstrate women as a minority within these professions. However none of that previous work has assessed publication behaviours based on gender. This paper presents research findings on gender distribution of authors of accepted papers for the IEEE Engineering and Medicine Society annual conference for 2007 (EMBC '07) held in Lyon, France. This information is used to present a position statement of the current state of gender representation for conference publication within the domain of biomedical engineering and health informatics. Issues in data preparation resulting from the lack of inclusion of gender in information gathered from accepted authors are presented and discussed.

  14. Agricultural Applications for Antimicrobials. A Danger to Human Health: An Official Position Statement of the Society of Infectious Diseases Pharmacists.

    Science.gov (United States)

    Aitken, Samuel L; Dilworth, Thomas J; Heil, Emily L; Nailor, Michael D

    2016-04-01

    The use of antibiotics in agriculture, particularly in food-producing animals, is pervasive and represents the overwhelming majority of antibiotic use worldwide. The link between antibiotic use in animals and antibiotic resistance in humans is unequivocal. Transmission can occur by ingesting undercooked meats harboring resistant bacteria, by direct contact of animals by animal handlers, and by various other means. Antibiotics used in aquaculture and antifungals used in horticulture are also an evolving threat to human health. Regulations aimed at decreasing the amount of antibiotics used in food production to limit the development of antibiotic resistance have recently been implemented. However, further action is needed to minimize antibiotic use in agriculture. This article describes the extent of this current problem and serves as the official position of the Society of Infectious Diseases Pharmacists on this urgent threat to human health.

  15. An Asynchronous IEEE Floating-Point Arithmetic Unit

    Directory of Open Access Journals (Sweden)

    Joel R. Noche

    2007-12-01

    Full Text Available An asynchronous floating-point arithmetic unit is designed and tested at the transistor level usingCadence software. It uses CMOS (complementary metal oxide semiconductor and DCVS (differentialcascode voltage switch logic in a 0.35 µm process using a 3.3 V supply voltage, with dual-rail data andsingle-rail control signals using four-phase handshaking.Using 17,085 transistors, the unit handles single-precision (32-bit addition/subtraction, multiplication,division, and remainder using the IEEE 754-1985 Standard for Binary Floating-Point Arithmetic, withrounding and other operations to be handled by separate hardware or software. Division and remainderare done using a restoring subtractive algorithm; multiplication uses an additive algorithm. Exceptionsare noted by flags (and not trap handlers and the output is in single-precision.Previous work on asynchronous floating-point arithmetic units have mostly focused on single operationssuch as division. This is the first work to the authors' knowledge that can perform floating-point addition,multiplication, division, and remainder using a common datapath.

  16. Throughput Analysis of IEEE 802.11 Multirate WLANs with Collision Aware Rate Adaptation Algorithm

    Institute of Scientific and Technical Information of China (English)

    Dhanasekaran Senthilkumar; A. Krishnan

    2010-01-01

    This paper presents a mathematical model that analyzes the throughput of the IEEE 802.11b distributed coordination function (DCF) with the collision aware rate adaptation (CARA) algorithm. IEEE 802.11 WLANs provide multiple transmission rates to improve system throughput by adapting the transmission rate to the current channel conditions. The system throughput is determined by some stations using low transmission rates due to bad channel conditions. CARA algorithm does not disturb the existing IEEE 802.1 lb formats and it can be easily incorporated into the commercial wireless local area networks (WLAN) devices. Finally, we verify our findings with simulation.

  17. Fuzzy logic congestion control in IEEE 802.11 wireless local area networks: A performance evaluation

    CSIR Research Space (South Africa)

    Nyirenda, CN

    2007-09-01

    Full Text Available networks because they are Clement .N. Nyirenda is with the Meraka Institute, Centre for Scientific and Industrial Research, Pretoria, South Africa (+27 72 1404564; e-mail: nyirendac@ ieee.org). Dawoud S. Dawoud is with the Radio Access Technologies... heavily depends on the frame payload size. When only frames are sent, the maximum throughput on the wireless channel on the wireless channel can drop below 1Mbps even at a data rate of 11 Mbps. At present, an IEEE working group (IEEE802.11n...

  18. Performance evaluation of complete data transfer of physical layer according to IEEE 802.15.4 standard

    Science.gov (United States)

    Raju, Kota Solomon; Merugu, Naresh Babu; Neetu, Babu, E. Ram

    2016-03-01

    ZigBee is well-accepted industrial standard for wireless sensor networks based on IEEE 802.15.4 standard. Wireless Sensor Networks is the major concern of communication these days. These Wireless Sensor Networks investigate the properties of networks of small battery-powered sensors with wireless communication. The communication between any two wireless nodes of wireless sensor networks is carried out through a protocol stack. This protocol stack has been designed by different vendors in various ways. Every custom vendor possesses his own protocol stack and algorithms especially at the MAC layer. But, many applications require modifications in their algorithms at various layers as per their requirements, especially energy efficient protocols at MAC layer that are simulated in Wireless sensor Network Simulators which are not being tested in real time systems because vendors do not allow the programmability of each layer in their protocol stack. This problem can be quoted as Vendor-Interoperability. The solution is to develop the programmable protocol stack where we can design our own application as required. As a part of the task first we tried implementing physical layer and transmission of data using physical layer. This paper describes about the transmission of the total number of bytes of Frame according to the IEEE 802.15.4 standard using Physical Layer.

  19. Performance Analysis of IEEE 802.11e (EDCF) and IEEE 802.11(DCF) WLAN Incorporating Different Physical Layer Standards

    Science.gov (United States)

    Sharma, V.; Singh, H.; Malhotra, J.

    2012-12-01

    Medium access coordination function basically implements the distributed coordination function (DCF) which provides support to best effort services but limited to QoS services. Subsequently, a new standard, namely enhanced distributed channel access (EDCA) is reported. The IEEE 802.11e (EDCA) defines MAC procedures to support QoS requirements which specifies distributed contention based access scheme to access the shared wireless media. This paper evaluates the performance of EDCA based IEEE 802.11 WLAN for various access categories (ACs) using OPNET™ Modeller 14.5. Further, the computed results are compared with DCF protocols in terms of QoS parameters. Furthermore, the simulative observation is reported at data rate of 54 Mbps using different physical layer protocols such as IEEE 802.11a/b/g to stumble on the best one to be implemented with EDCF to achieve improved QoS.

  20. 基于OFDM的IEEE802.16a物理层简介%Introduction of IEEE802.16a Physical Layer Based on OFDM

    Institute of Scientific and Technical Information of China (English)

    许云东; 潘志文

    2006-01-01

    简要介绍了IEEE802.16的基本概况,描述了IEEE802.16a标准采用的几种物理层方案.IEEE802.16a协议物理层支持的主流技术就是OFDM技术,重点介绍了OFDM的基本原理,采用OFDM调制技术的WirelessMAN-OFDM系统,以及其物理层的一些参数及性能.最后介绍了2种双工方式的帧结构及其工作原理.

  1. IPv6 and IEEE 1888: Fundamental Infrastructure and Protocol for Smart Grid%IPv6和IEEE1888:国际智能电网的基础架构和协议

    Institute of Scientific and Technical Information of China (English)

    谷展

    2012-01-01

    With rapid development of Intemet, information technologies have deployed widely into many application fields. For example, IP,Internet of Things and cloud computing have been widely used in green industry and smart energy. Recently IP for Smart Object Alliance (IPSO Alliance ) published lPv6 and IEEE 1888 based white paper for Smart Grid infrastructure and protocol, joint with many leading enterprises in international industry chain, including Cisco, Itron, Duke Energy, as well as domestic China Telecom and BII Group. As a core protocol for next generation Internet, IPv6 provides broad develop space for smart grid. IEEE 1888 protocol constructs a uniform control and management platform for smart terminals to access Internet. This paper mainly introduced this white paper, beginning from network requirements, analysed necessity for smart grid to adopting IPv6 and IEEE 1888 as fimdamental infrastructure and protocol. Finally this paper discussed key technologies and related technical standards in detail. This paper provided a comprehensive overview for the last kilometer to smart grid.%随着互联网的发展,信息技术深入到各行各业,如IP,物联网,云计算等技术被广泛地应用于绿色节能、智慧能源中。最近国际物联网联盟IPSO集合国内外产业领头公司.国外的如Cisco,Itron,Duke Energy,国内的如中国电信,天地互连公司,联合发布了以IPv6和IEEE1888为国际智能电网基础架构和协议的白皮书。其中,IPv6协议作为下一代互联网的基础协议为智能电网信息化提供了更广阔的空间。而IEEE1888开放标准为末端智能终端接入互联网提供了统一的管控平台。本文主要介绍该白皮书的内容,从智能电网最后一公里的网络需求入手,讲述智能电网为什么需要IPv6和IEEE1888作为基础通信架构和协议.详细解析白皮书中关于IPv6通信基础架构的关键技术模块和相关技术标准。为国际智

  2. IEEE 802.11-Based Wireless Sensor System for Vibration Measurement

    Directory of Open Access Journals (Sweden)

    Yutaka Uchimura

    2010-01-01

    Full Text Available Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires vibration measurement. For the vibration measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a vibration measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.

  3. Approximate calculational techniques for radiation protection applications (collection of papers presented at the November 1985 American Nuclear Society meeting)

    Energy Technology Data Exchange (ETDEWEB)

    Rice, A.F.; Roussin, R.W. (comps.)

    1986-09-01

    Although radiation protection principles are, on the whole, well understood and a whole series of computer codes exist for their solution, it is felt that there is a need for practical, approximate techniques to be used by the practicing nuclear engineer for a variety of applications. Within the context of approximate techniques, the papers presented cover a broad overview of specific problems, for example, skyshine and penetration analysis, with applications extending from general nuclear reactor design to spent fuel storage and fusion. Separate abstracts have been prepared for individual papers.

  4. Analysis of Adaptive Control Scheme in IEEE 802.11 and IEEE 802.11e Wireless LANs

    Science.gov (United States)

    Lee, Bih-Hwang; Lai, Hui-Cheng

    In order to achieve the prioritized quality of service (QoS) guarantee, the IEEE 802.11e EDCAF (the enhanced distributed channel access function) provides the distinguished services by configuring the different QoS parameters to different access categories (ACs). An admission control scheme is needed to maximize the utilization of wireless channel. Most of papers study throughput improvement by solving the complicated multidimensional Markov-chain model. In this paper, we introduce a back-off model to study the transmission probability of the different arbitration interframe space number (AIFSN) and the minimum contention window size (CWmin). We propose an adaptive control scheme (ACS) to dynamically update AIFSN and CWmin based on the periodical monitoring of current channel status and QoS requirements to achieve the specific service differentiation at access points (AP). This paper provides an effective tuning mechanism for improving QoS in WLAN. Analytical and simulation results show that the proposed scheme outperforms the basic EDCAF in terms of throughput and service differentiation especially at high collision rate.

  5. Application of stable isotopic techniques in the prevention of degenerative diseases like obesity and NIDDM in developing societies.

    Science.gov (United States)

    Shetty, Prakash; Iyengar, Venkatesh; Sawaya, Ana; Diaz, Erik; Ma, Guansheng; Hernandez-Triana, Manuel; Yajnik, Chittaranjan; Forrester, Terrence; Valencia, Mauro; Rush, Elaine; Adeyemo, Adebowale; Jahoor, Farook; Roberts, Susan

    2002-09-01

    Economic development in developing societies characterized by industrialization, urbanization, and globalization has seen the emergence of an epidemic of diet- and life-style-related chronic degenerative diseases. A research project was initiated under the aegis of the International Atomic Energy Agency (IAEA), Vienna, Austria under its Coordinated Research Programme (CRP) to promote the use of stable isotopic techniques to document the extent of the problem and to understand the determinants of this epidemic. The principal objectives of this CRP involving countries both in the North and the South are to define the magnitude of the problem of obesity and non-insulin dependent diabetes mellitus (NIDDM) in developing countries, to identify the vulnerable groups at increased risk, and to attempt to describe the metabolic and physiological mechanisms underlying this phenomenon. These comparative international studies of obesity and NIDDM are looking at the effects of childhood malnutrition (Brazil) and socioeconomic differentials (Mexico) on adult risk factors; the composition of the daily diet on obesity (Chile); levels of patterns of physical activity of older adults (China) as well as their influence on weight gain and obesity (Cuba, Nigeria); the impact of body composition and energy expenditure on the evolution frank diabetes from impaired glucose tolerance (Jamaica), and of body compositional changes and the role of inflammatory cytokines on impaired glucose tolerance (India). The last study conducted in New Zealand was aimed at comparing the energy expenditures of Maori (Pacific Island) with New Zealanders of European descent.

  6. Langattoman lähiverkon päivitys IEEE 802.11g -laitteista IEEE 802.11n -laitteisiin

    OpenAIRE

    Kokkonen, Janne

    2009-01-01

    Insinöörityössä tutkittiin langattoman lähiverkon vaiheittaista päivittämistä IEEE 802.11g -standardin laitteista IEEE 802.11n -standardin laitteisiin. Tavoitteena oli tutkia teorian ja käytännön mittauksien pohjalta paras mahdollinen vaihtoehto verkon päivityksen toteuttamiseksi. Työhön liittyvät mittaukset suoritettiin Metropolia Ammattikorkeakoulun tiloissa ja laitteilla. Työn alussa selvitettiin langattomiin lähiverkkoihin liittyviä teoreettisia yksityiskohtia, joiden perusteella rake...

  7. Langattoman lähiverkon päivitys IEEE 802.11g -laitteista IEEE 802.11n -laitteisiin

    OpenAIRE

    Kokkonen, Janne

    2009-01-01

    Insinöörityössä tutkittiin langattoman lähiverkon vaiheittaista päivittämistä IEEE 802.11g -standardin laitteista IEEE 802.11n -standardin laitteisiin. Tavoitteena oli tutkia teorian ja käytännön mittauksien pohjalta paras mahdollinen vaihtoehto verkon päivityksen toteuttamiseksi. Työhön liittyvät mittaukset suoritettiin Metropolia Ammattikorkeakoulun tiloissa ja laitteilla. Työn alussa selvitettiin langattomiin lähiverkkoihin liittyviä teoreettisia yksityiskohtia, joiden perusteella rake...

  8. 高速接口USB与IEEE1394的性能分析%Performance Analysis of High-Speed Digital Interface USB and IEEE 1394

    Institute of Scientific and Technical Information of China (English)

    李洋; 邹建华

    2001-01-01

    The basic features of Universal Serial BusUSB and IEEE 1394 are analyzed and compared in this paper and the foreground of the two interfaces are described.%对计算机外设高速接口USB和IEEE 1394的技术特点和数据传输机制进行了较详细的分析,比较了两种接口的性能,并对其应用前景进行了展望。

  9. Corrections to "Connectivity-Based Reliable Multicast MAC Protocol for IEEE 802.11 Wireless LANs"

    Directory of Open Access Journals (Sweden)

    Choi Woo-Yong

    2010-01-01

    Full Text Available We have found the errors in the throughput formulae presented in our paper "Connectivity-based reliable multicast MAC protocol for IEEE 802.11 wireless LANs". We provide the corrected formulae and numerical results.

  10. Throughput Analysis Model for IEEE 802.11e EDCA with Multiple Access Categories

    Directory of Open Access Journals (Sweden)

    Y. Lee

    2013-08-01

    Full Text Available IEEE 802.11e standard has been specified to support differentiated quality of service (QoS, one of the critical issues on the conventional IEEE 802.11 wireless local area networks (WLANs. Enhanced Distributed Channel Access (EDCA is the fundamental and mandatory contention-based channel access method of IEEE 802.11e, and delivers traffic based on differentiated Access Categories (ACs. A general three dimensional Markov chain model of IEEE 802.11e EDCA for performance analysis is proposed in this paper. The analytical model considers multiple stations with an arbitrary number of different ACs. It also differentiates the contention window (CW sizes and the arbitration interframe spaces (AIFSs, and considers virtual collision mechanism. Based on the model, the saturation throughput of EDCA is derived, and the accuracy of the proposed model is validated via simulations.

  11. Developing IEEE medical device standards: a case study, wearable cuffless blood pressure measuring devices.

    Science.gov (United States)

    Carey, Carole C; Zhang, Yuang-Ting

    2010-01-01

    The Institute of Electrical and Electronics Engineers Standards Association (IEEE-SA) is a leading standards developing organization of global industry standards in a wide-range of industries, including biomedical and healthcare.

  12. Access Point Selection for Multi-Rate IEEE 802.11 Wireless LANs

    Science.gov (United States)

    2014-05-16

    Feb 2010. [ 11 ] Y. Bejerano, S. jae Han, and L. Li, “Fairness and Load Balancing in Wireless LANs Using Association Control,” Networking, IEEE /ACM...Steenkiste, “Fixing 802 . 11 access point selection,” ACM SIGCOMM Computer Communication Review, 2002. [15] J. C. Chen, T. C. Chen, T. Zhang, and E. van...Access Point Selection for Multi-Rate IEEE 802.11 Wireless LANs Shicong Yang Avideh Zakhor Electrical Engineering and Computer Sciences University of

  13. Algorithm XXX : functions to support the IEEE standard for binary floating-point arithmetic.

    Energy Technology Data Exchange (ETDEWEB)

    Cody, W. J.; Mathematics and Computer Science

    1993-12-01

    This paper describes C programs for the support functions copysign(x,y), logb(x), scalb(x,n), nextafter(x,y), finite(x), and isnan(x) recommended in the Appendix to the IEEE Standard for Binary Floating-Point Arithmetic. In the case of logb, the modified definition given in the later IEEE Standard for Radix-Independent Floating-Point Arithmetic is followed. These programs should run without modification on most systems conforming to the binary standard.

  14. The Unum Number Format: Mathematical Foundations, Implementation and Comparison to IEEE 754 Floating-Point Numbers

    OpenAIRE

    Hunhold, Laslo

    2017-01-01

    This thesis examines a modern concept for machine numbers based on interval arithmetic called 'Unums' and compares it to IEEE 754 floating-point arithmetic, evaluating possible uses of this format where floating-point numbers are inadequate. In the course of this examination, this thesis builds theoretical foundations for IEEE 754 floating-point numbers, interval arithmetic based on the projectively extended real numbers and Unums.

  15. Improving Security Levels Of IEEE802.16e Authentication By Diffie-Hellman Method

    Directory of Open Access Journals (Sweden)

    Mohammad Zabihi

    2011-11-01

    Full Text Available In this paper, we proposed an authentication method according to Diffie-Hellman. First, we introduce different methods for authentication in IEEE.802.16 then we proposed an authentication method according to Diffie-Hellman and in the last we compare different methods for authentication to improve security in IEEE802.16e. CPN is a useful for simulation and compare protocol together so we use CPN tools in this paper.

  16. A Unified Computational Framework for Real-Time Optimal Control , IEEE (42nd; 2003; Maui, Hawaii)

    OpenAIRE

    Ross, I. Michael; Fahroo, Fariba

    2003-01-01

    The article of record as published may be located at http://ieeexplore.ieee.org Approved for public display, distribution unlimited Proceedings of the 42nd IEEE ; Conference on Decision and Control ; Maui, Hawaii USA, December 2003 The dynamics of each agent of a multi-agent controlled dynamical system can be formulated in several possible ways: differential inclusion, flatness parameterization, higher-order inclusions and so on. A plethora of techniques have been proposed for each o...

  17. IEEE 802.16协议及其应用

    Institute of Scientific and Technical Information of China (English)

    张云飞

    2009-01-01

    IEEE 802.16协议由于具有广阔的应用前景,目前受到了国内外学术界和产业界的广泛关注.本文首先介绍了IEEE 802.16协议系列的现状及其进展,然后叙述了其应用情况.

  18. Enhancing MAC performance of DCF protocol for IEEE 802.11 wireless LANs

    Science.gov (United States)

    Choi, Woo-Yong

    2017-01-01

    The DCF (Distributed Coordination Function) is the basic MAC (Medium Access Control) protocol of IEEE 802.11 wireless LANs and compatible with various IEEE 802.11 PHY extensions. The performance of the DCF degrades exponentially as the number of nodes participating in the DCF transmission procedure increases. To deal with this problem, we propose a simple, however efficient modification of the DCF by which the performance of the DCF is greatly enhanced.

  19. 基于IEEE 802.1 x/EAP-TLS认证协议安全性的改进%The Improvement of Security based on IEEE 802 . 1 x/EAP-TLS Protocol

    Institute of Scientific and Technical Information of China (English)

    孟迪

    2014-01-01

    Nowadays, the Internet Technology develops rapidly, the application of WLAN has become more and more widespread. Because the wireless network has the nature of opening,at the same time of applying rap-idly,the security problem is constraining the wireless network. By studying the security of IEEE 802. 1x/EAP-TLS protocol,this thesis provides an improvement scheme to make the information which are transmitted be-tween client and AP more secure,promote the security of wireless network in some degree.%在网络技术飞速发展的今天,无线网的应用范围越来越广泛.由于无线网具有开放性,在广泛应用的同时,其安全问题也成为了制约网络发展的关键问题.本文详细研究了IEEE 802.1x/EAP-TLS认证协议的安全问题,针对安全漏洞提出了改进方案,通过对客户端与认证系统之间传递信息的改进,在一定程度上提升了无线网的安全性.

  20. Final report: SIAM [Society for Industrial and Applied Mathematics] Conference on Linear Algebra and its Applications, October 23-26, 2000

    Energy Technology Data Exchange (ETDEWEB)

    None

    2001-04-06

    The Society for Industrial and Applied Mathematics (SIAM) and the SIAM Activity Group in Linear Algebra in conjunction with the International Linear Algebra Society (ILAS) held the SIAM Conference on Linear Algebra and its applications on October 23-26, 2000 at the McKimmon Conference Center on the campus of North Carolina State University in Raleigh, North Carolina. The goals of this conference were to highlight the central role of linear algebra in many problems of mathematics and the applied sciences, including engineering problems in systems and control, signal processing and coding, economic and business problems, and problems from biology and geophysics. Particular consideration in this conference was given to applications in image processing, information retrieval and management (such as the performance of search engines on the Internet), aircraft manufacturing and design, industrial optimization problems, and assessing the economic cost of linear algebra in industry. With the development of high performance computers and new parallel architectures, computational linear algebra is in a state of rapid development. There are grand challenges requiring the development of efficient methods that solve truly large-scale problems by exploiting the ever-increasing computational power. One of the primary goals of this conference was to bring researchers and practitioners in these various areas together for exchange of information and ideas. In particular, the collaboration with ILAS was an important factor in bringing about fruitful interaction among researchers in theory, computation, and applications. There were 250 total attendees with 17% coming from industry and government. In addition, there were 27 students who attended.

  1. Efficient Distributed Authentication Key Scheme for Multi-hop Relay In IEEE 802.16j Network

    Directory of Open Access Journals (Sweden)

    ADNAN SHAHID KHAN,

    2010-06-01

    Full Text Available Relaying and cooperation have re-emerged as important research topic in the wireless communication over the past decade. IEEE 802.16j Multihop relay network is assiduously developing to accomplish high capacity services with large cell coverage. Considerable interest currently exists in the exploitation of Relay based Wimax. This is mainly the result of lower infrastructure cost and high data transfer rates compared to existing 3G. However due to lack of physical boundaries and injection of distributed relays, it is known to be morevulnerable to security holes as a trade off. In this paper we propose a new distributed authentication key scheme for Multihop Relays IEEE 802.16j network service. The propose scheme uses decode and forward relays with localized authentication. The scheme works in distributed authentication to authenticate Subscriber station (SS and Relay stations (RS at initial network entry. Our new efficient distributed scheme utilizes healthy security issues and the Multihop Relay network application features. Both analysis and performance evaluation shows that our scheme can significantly reduce the security holes as well as communication overheads.

  2. Path loss variation of on-body UWB channel in the frequency bands of IEEE 802.15.6 standard.

    Science.gov (United States)

    Goswami, Dayananda; Sarma, Kanak C; Mahanta, Anil

    2016-06-01

    The wireless body area network (WBAN) has gaining tremendous attention among researchers and academicians for its envisioned applications in healthcare service. Ultra wideband (UWB) radio technology is considered as excellent air interface for communication among body area network devices. Characterisation and modelling of channel parameters are utmost prerequisite for the development of reliable communication system. The path loss of on-body UWB channel for each frequency band defined in IEEE 802.15.6 standard is experimentally determined. The parameters of path loss model are statistically determined by analysing measurement data. Both the line-of-sight and non-line-of-sight channel conditions are considered in the measurement. Variations of parameter values with the size of human body are analysed along with the variation of parameter values with the surrounding environments. It is observed that the parameters of the path loss model vary with the frequency band as well as with the body size and surrounding environment. The derived parameter values are specific to the particular frequency bands of IEEE 802.15.6 standard, which will be useful for the development of efficient UWB WBAN system.

  3. Validation testing of ANSI/IEEE n42.49 standard requirements for personal emergency radiation detectors.

    Science.gov (United States)

    Pibida, L; Minniti, R; O'Brien, M

    2010-04-01

    Various radiation detectors including electronic personal emergency radiation detectors (PERDs), radiochromic film cards and thermoluminescent dosimeters (TLDs) were used to validate a subset of the radiological test requirements listed in the American National Standards Institute/The Institute of Electrical and Electronic Engineers (ANSI/IEEE) N42.49 standard. The subset of tests included the following: comparing the readout of the detectors with the value given at the National Institute of Standards and Technology (NIST); testing of the alarm settings (when applicable) in air-kerma (or exposure) and air-kerma rate (or exposure rate) mode; and investigating the effect of testing the detectors mounted on a phantom and free in air. The purpose of this work was not to test the performance of the sample of detectors used. Instead, the detectors were used to validate the requirements of the written standard being developed. For this purpose, the performance and response of these instruments were recorded when placed in (137)Cs, and x-ray beams at different air-kerma rates and test conditions. The measurements described in this report were performed at the NIST x-ray and gamma-ray radiation calibration facilities. The data in this report provide a benchmark in support of the development of the ANSI/IEEE N42.49 standard.

  4. Optimal modulation and coding scheme allocation of scalable video multicast over IEEE 802.16e networks

    Directory of Open Access Journals (Sweden)

    Tsai Chia-Tai

    2011-01-01

    Full Text Available Abstract With the rapid development of wireless communication technology and the rapid increase in demand for network bandwidth, IEEE 802.16e is an emerging network technique that has been deployed in many metropolises. In addition to the features of high data rate and large coverage, it also enables scalable video multicasting, which is a potentially promising application, over an IEEE 802.16e network. How to optimally assign the modulation and coding scheme (MCS of the scalable video stream for the mobile subscriber stations to improve spectral efficiency and maximize utility is a crucial task. We formulate this MCS assignment problem as an optimization problem, called the total utility maximization problem (TUMP. This article transforms the TUMP into a precedence constraint knapsack problem, which is a NP-complete problem. Then, a branch and bound method, which is based on two dominance rules and a lower bound, is presented to solve the TUMP. The simulation results show that the proposed branch and bound method can find the optimal solution efficiently.

  5. IEEE 802154 and ZigBee as enabling technologies for low-power wireless systems with quality-of-service constraints

    CERN Document Server

    Tennina, Stefano; Daidone, Roberta; Alves, Mário; Jurčík, Petr; Severino, Ricardo; Tiloca, Marco; Hauer, Jan-Hinrich; Pereira, Nuno; Dini, Gianluca; Bouroche, Mélanie; Tovar, Eduardo

    2013-01-01

    This book outlines the most important characteristics of IEEE 802.15.4 and ZigBee and how they can be used to engineer Wireless Sensor Network (WSN) systems and applications, with a particular focus on Quality-of-Service (QoS) aspects. It starts by providing a snapshot of the most relevant features of these two protocols, identifying some gaps in the standard specifications. Then it describes several state-of-the-art open-source implementations, models and tools that have been designed by the authors and have been widely used by the international community. The book also outlines the fundamental performance limits of IEEE 802.15.4/ZigBee networks, based on well-sustained analytical, simulation and experimental models, including how to dimension such networks to optimize delay/energy trade-offs.

  6. Enhancing professionalism among engineering students through involvements in technical societies.

    Science.gov (United States)

    Ghosh, Sreejita; Samineni, Anvesh; Mandal, Subhamoy; Murari, Bhaskar Mohan

    2015-08-01

    A student chapter can be considered to be a miniature enterprise; however without the latter's major financial risks. Involvement in the student chapter of a professional society like IEEE at undergraduate level plays a pivotal role in the overall professional development of the student by keeping the students informed about the various career possibilities. A student chapter shapes the hitherto naive students into industry ready professionals and to suitable candidates for some of the best grad schools worldwide. This assertion has been discussed in-depth taking the example of IEEE EMBS Student Branch chapter of VIT University. It has been described how the entire process, - starting from inception of an idea to its materialization in to an activity, has shaped the volunteers and participants into better professionals.

  7. Adaptive Sleep Scheduling for Health Monitoring System Based on the IEEE 802.15.4 Standard

    Directory of Open Access Journals (Sweden)

    Nurul Fahmi

    2016-08-01

    Full Text Available In the recent years, Wireless Sensor Networks (WSNs have become a very popular technology for research in various fields. One of the technologies which is developed using WSN is environmental health monitoring. However, there is a problem when we want to optimize the performance of the environmental health monitoring such as the limitation of the energy. In this paper, we proposed a method for the environmental health monitoring using the fuzzy logic approach according to the environmental health conditions. We use that condition to determine the sleep time in the system based on IEEE 802.15.4 standard protocol. The main purpose of this method is to extend the life and minimize the energy consumption of the battery. We implemented this system in the real hardware test-bed using temperature, humidity, CO and CO2 sensors. We compared the performance without sleep scheduling, with sleep scheduling and adaptive sleep scheduling. The power consumption spent during the process of testing without sleep scheduling is 52%, for the sleep scheduling is 13%, while using the adaptive sleep scheduling is around 7%. The users also can monitor the health condition via mobile phone or web-based application, in real-time anywhere and anytime.

  8. The Impact of Dynamic RTS Threshold Adjustment for IEEE 802.11 MAC Protocol

    Directory of Open Access Journals (Sweden)

    Mostafa Mjidi

    2009-01-01

    Full Text Available In recent years, wireless technologies and application received great attention. The Medium Access Control (MAC protocol is the main element that determines the efficiency in sharing the limited communication bandwidth of the wireless channel in wireless local area networks (WLANs. IEEE 802.11 introduced the optional RTS/CTS handshaking mechanism to address the hidden terminal problem as well as to reduces the chance of collision in case of higher node density and traffic. RTS Threshold (RT determines when RTS/CTS mechanism should be used and proved to be an important parameter for performance characteristics in data transmission. We first investigate to find a meaningful threshold value according to the network situation and determine the impact of using or disengaging the RTS/CTS optional mechanism and dynamically adjust the RTS Threshold to maximize data transmission. The results show a significant improvement over existing CSMA/CA and RTS/CTS schemes. Our adaptive scheme performed even better when data rate increases. We verify our proposed scheme both analytically and with extensive network simulation using ns-2.

  9. Achievable Throughput-Based MAC Layer Handoff in IEEE 802.11 Wireless Local Area Networks

    Directory of Open Access Journals (Sweden)

    Wu Haitao

    2009-01-01

    Full Text Available We propose a MAC layer handoff mechanism for IEEE 802.11 Wireless Local Area Networks (WLAN to give benefit to bandwidth-greedy applications at STAs. The proposed mechanism determines an optimal AP with the maximum achievable throughput rather than the best signal condition by estimating the AP's bandwidth with a new on-the-fly measurement method, Transient Frame Capture (TFC, and predicting the actual throughput could be achieved at STAs. Since the TFC is employed based on the promiscuous mode of WLAN NIC, STAs can avoid the service degradation through the current associated AP. In addition, the proposed mechanism is a client-only solution which does not require any modification of network protocol on APs. To evaluate the performance of the proposed mechanism, we develop an analytic model to estimate reliable and accurate bandwidth of the AP and demonstrate through testbed measurement with various experimental study methods. We also validate the fairness of the proposed mechanism through simulation studies.

  10. Green Frame Aggregation Scheme for IEEE 802.11n Networks

    KAUST Repository

    Alaslani, Maha S.

    2015-04-01

    Frame aggregation is one of the major MAC layer enhancements in the IEEE 802.11 family that boosts the network throughput performance. It aims to achieve higher throughput by transmitting huge amount of data in a single transmit oppor- tunity. With the increasing awareness of energy e ciency, it has become vital to rethink about the design of such frame aggregation protocol. Aggregation techniques help to reduce energy consumption over ideal channel conditions. However, in a noisy channel environment, a new energy-aware frame aggregation scheme is required. In this thesis, a novel Green Frame Aggregation (GFA) scheduling scheme has been proposed and evaluated. GFA optimizes the aggregate size based on channel quality in order to minimize the consumed energy. GFA selects the optimal sub-frame size that satisfies the loss constraint for real-time applications as well as the energy budget of the ideal channel situations. The design, the implementation, and evaluation of GFA using testbed deployment is done. The experimental analysis shows that GFA outperforms the conventional frame aggregation methodology in terms of energy e ciency by about 6⇥ in the presence of severe interference conditions. Moreover, GFA also outperforms the static frame sizing method in terms of network goodput and maintains almost the same end- to-end latency.

  11. Delay Analysis of an Enhancing IEEE 802.11 Point Coordination Function MAC Protocol

    Directory of Open Access Journals (Sweden)

    Zheng Guan

    2014-05-01

    Full Text Available The widespread use of multimedia networking applications has brought more requirements to the network, creating a need for end-to-end Quality of Service (QoS. The contention-free Point Coordination Function (PCF with Round Robin scheme, where the Access Point controls all transmissions based on a polling mechanism, is defined in IEEE 802.11 standard to provide QoS service. This network suffers from inefficiency in the delay sensitive traffic and makes. It is difficult to provide priority-differentiated service. In this paper, a useful enhance mechanism is derived from a two-level-polling model with a parallel scheme between the polling and switch over processes. We consider two different polling schemes according to station classify: key station and normal station. This mechanism allows for a delay guarantee as well as priority service. An analytical is developed for evaluating the queuing length for the station and waiting time for the packets at nodes. Based on this model, we achieve several closed-form expressions for mean cycle time, mean queue length and mean waiting time. To verify the correctness of our analytical model, we also develop a simulator for the 802.11 PCF MAC. The simulation results well match the analytical results.

  12. Link Investigation of IEEE 802.15.4 Wireless Sensor Networks in Forests

    Directory of Open Access Journals (Sweden)

    Xingjian Ding

    2016-06-01

    Full Text Available Wireless sensor networks are expected to automatically monitor the ecological evolution and wildlife habits in forests. Low-power links (transceivers are often adopted in wireless sensor network applications, in order to save the precious sensor energy and then achieve long-term, unattended monitoring. Recent research has presented some performance characteristics of such low-power wireless links under laboratory or outdoor scenarios with less obstacles, and they have found that low-power wireless links are unreliable and prone to be affected by the target environment. However, there is still less understanding about how well the low-power wireless link performs in real-world forests and to what extent the complex in-forest surrounding environments affect the link performances. In this paper, we empirically evaluate the low-power links of wireless sensors in three typical different forest environments. Our experiment investigates the performance of the link layer compatible with the IEEE 802.15.4 standard and analyzes the variation patterns of the packet reception ratio (PRR, the received signal strength indicator (RSSI and the link quality indicator (LQI under diverse experimental settings. Some observations of this study are inconsistent with or even contradict prior results that are achieved in open fields or relatively clean environments and thus, provide new insights both into effectively evaluating the low-power wireless links and into efficiently deploying wireless sensor network systems in forest environments.

  13. An Enhanced Reservation-Based MAC Protocol for IEEE 802.15.4 Networks

    Science.gov (United States)

    Afonso, José A.; Silva, Helder D.; Macedo, Pedro; Rocha, Luis A.

    2011-01-01

    The IEEE 802.15.4 Medium Access Control (MAC) protocol is an enabling standard for wireless sensor networks. In order to support applications requiring dedicated bandwidth or bounded delay, it provides a reservation-based scheme named Guaranteed Time Slot (GTS). However, the GTS scheme presents some drawbacks, such as inefficient bandwidth utilization and support to a maximum of only seven devices. This paper presents eLPRT (enhanced Low Power Real Time), a new reservation-based MAC protocol that introduces several performance enhancing features in comparison to the GTS scheme. This MAC protocol builds on top of LPRT (Low Power Real Time) and includes various mechanisms designed to increase data transmission reliability against channel errors, improve bandwidth utilization and increase the number of supported devices. A motion capture system based on inertial and magnetic sensors has been used to validate the protocol. The effectiveness of the performance enhancements introduced by each of the new features is demonstrated through the provision of both simulation and experimental results. PMID:22163826

  14. Link Investigation of IEEE 802.15.4 Wireless Sensor Networks in Forests.

    Science.gov (United States)

    Ding, Xingjian; Sun, Guodong; Yang, Gaoxiang; Shang, Xinna

    2016-06-27

    Wireless sensor networks are expected to automatically monitor the ecological evolution and wildlife habits in forests. Low-power links (transceivers) are often adopted in wireless sensor network applications, in order to save the precious sensor energy and then achieve long-term, unattended monitoring. Recent research has presented some performance characteristics of such low-power wireless links under laboratory or outdoor scenarios with less obstacles, and they have found that low-power wireless links are unreliable and prone to be affected by the target environment. However, there is still less understanding about how well the low-power wireless link performs in real-world forests and to what extent the complex in-forest surrounding environments affect the link performances. In this paper, we empirically evaluate the low-power links of wireless sensors in three typical different forest environments. Our experiment investigates the performance of the link layer compatible with the IEEE 802.15.4 standard and analyzes the variation patterns of the packet reception ratio (PRR), the received signal strength indicator (RSSI) and the link quality indicator (LQI) under diverse experimental settings. Some observations of this study are inconsistent with or even contradict prior results that are achieved in open fields or relatively clean environments and thus, provide new insights both into effectively evaluating the low-power wireless links and into efficiently deploying wireless sensor network systems in forest environments.

  15. A Bi-Scheduler Algorithm for Frame Aggregation In IEEE 802.11N

    Directory of Open Access Journals (Sweden)

    Vanaja Ramaswamy

    2013-12-01

    Full Text Available IEEE 802.11n mainly aims to provide high throughput , reliability and good security over its other prev ious standards. The performance of 802.11n is very effec tive on the saturated traffic through the use of fr ame aggregation. But this frame aggregation will not ef fectively function in all scenarios. The main objec tive of this paper is to improve the throughput of the wire less LAN through effective frame aggregation using scheduler mechanism. The Bi-Scheduler algorithm pro posed in this article aims to segregate frames base d on their access categories. The outer scheduler sep arates delay sensitive applications from the incomi ng burst of multi-part data and also decides whether t o apply Aggregated - MAC Service Data Unit (A- MSDU aggregation technique or to send the data wit hout any aggregation. The inner scheduler schedules the remaining (delay-insensitive, background and be st-effort packets using Aggregated-MAC Protocol Data unit (A-MPDU aggregation technique.

  16. Adaptive Transmission Opportunity Scheme Based on Delay Bound and Network Load in IEEE 802.11e Wireless LANs

    Directory of Open Access Journals (Sweden)

    S. Kim

    2013-08-01

    Full Text Available The IEEE 802.11e EDCA (Enhanced Distributed Channel Access is able to provide QoS (Quality of Service by adjusting the transmission opportunities (TXOPs, which control the period to access the medium. The EDCA has a fairness problem among competing stations, which support multimedia applications with different delay bounds. In this paper, we propose a simple and effective scheme for alleviating the fairness problem. The proposed scheme dynamically allocates the TXOP value based on the delay bounds of the data packets in a queue and the traffic load of network. Performance of the proposed scheme is investigated by simulation. Our results show that compared to conventional scheme, the proposed scheme significantly improves network performance, and achieves a high degree of fairness among stations with different multimedia applications.

  17. IEEE Xplore® Digital Library. Quick user guides

    OpenAIRE

    2014-01-01

    Представлены руководства по работе с платформой IEEE Xplore® Digital Library, содержащей ресурсы в области электроники, радиосвязи, вычислительной техники, информационных технологий, энергетики, машиностроения, физики, химии, геологии, нанотехнологий на английском языке. Руководства: 1) Started with Your Search - Поиск, уточнение результатов, доступ к полнотекстовым документам, сохранение поисковых резкльтатов, расширенные функции; 2) Search and Save with Your File Cabinet - Поиск, уточнен...

  18. American Meteorological Society (AMS) - The Modern Era Retrospective-Analysis for Research and Applications (MERRA) Data and Accessibility

    Science.gov (United States)

    daSilva, Arlindo

    2009-01-01

    The AM Short Course on The Modern Era Retrospective-analysis for Research and Applications (MERRA) data and accessibility will be held on January 11, 2009 preceding the 89th Annual Meeting in Phoenix, Arizona. Preliminary programs, registration, hotel, and general information will be posted on the AMS Web site in mid-September 2008. Retrospective-analyses (or reanalyses) have been established as an important tool in weather and climate research over the last decade. As computer power increases, the data assimilation and modeling systems improve and become more advanced, the input data quality increases and so reanalyses become more reliable. In 2008, NASA Global Modeling and Assimilation Office began producing a new reanalysis called the Modem Era Retrospective-analysis for Research and Applications (MERRA). The initial data from the reanalysis has been made available to the community and should be complete through 30 years (1979-present) by Fall of 2009. MERRA has taken advantage of the advancement of computing resources to provide users more data than previously available. The native spatial resolution is nominally 1/2 degrees and the surface two dimensional data are one hourly frequency. In addition to the meteorological analysis data, complete mass, energy and momentum budget data and also stratospheric data are provided. The eventual data holdings will exceed 150Tb. In order to facilitate user accessibility to the data, it will be stored in online hard drives (not tape storage) and available through several portals. Subsetting tools will also be available to allow users to tailor their data requests. The goals of this short course are to provide hands on users of reanalyses instruction on MERRA systems and also interactive experience with the online data and access tools. The course is intended for students and research scientists who will be actively interested in accessing and applying MERRA data in their weather, climate or applications work. The course has

  19. The application of the theory of planned behavior to help-seeking intention in a Chinese society.

    Science.gov (United States)

    Mak, Hio Wa; Davis, J Mark

    2014-09-01

    This study tested the efficacy of Ajzen's theory of planned behavior (TPB) in explaining intention to seek mental health services and compared the traditional TPB model with a TPB partial mediation model. It also aimed to understand factors related to intention to seek mental health services in Macao to inform local policies. The present study consisted of two phases: (a) a pilot study to develop belief-based measures used in the main study, and (b) a cross-sectional study to investigate the application of TPB in understanding help-seeking intention. In the main study, 337 Macao residents (age range 18-65) participated in a survey conducted in the community. The TPB partial mediation model was better than the traditional TPB model in explaining help-seeking intention in Macao. The model also suggested that attitude, subjective norm, and perceived behavioral control were all significant predictors of help-seeking intention. However, symptom severity, prior help-seeking, and gender did not significantly directly predict help-seeking intention. Preference for the TPB partial mediation model may be culturally relevant. The implications of the findings are discussed in relation to the salient beliefs about help-seeking. Limitations and recommendations for future research are provided.

  20. IEEE 1547 and 2030 Standards for Distributed Energy Resources Interconnection and Interoperability with the Electricity Grid

    Energy Technology Data Exchange (ETDEWEB)

    Basso, T.

    2014-12-01

    Public-private partnerships have been a mainstay of the U.S. Department of Energy and the National Renewable Energy Laboratory (DOE/NREL) approach to research and development. These partnerships also include technology development that enables grid modernization and distributed energy resources (DER) advancement, especially renewable energy systems integration with the grid. Through DOE/NREL and industry support of Institute of Electrical and Electronics Engineers (IEEE) standards development, the IEEE 1547 series of standards has helped shape the way utilities and other businesses have worked together to realize increasing amounts of DER interconnected with the distribution grid. And more recently, the IEEE 2030 series of standards is helping to further realize greater implementation of communications and information technologies that provide interoperability solutions for enhanced integration of DER and loads with the grid. For these standards development partnerships, for approximately $1 of federal funding, industry partnering has contributed $5. In this report, the status update is presented for the American National Standards IEEE 1547 and IEEE 2030 series of standards. A short synopsis of the history of the 1547 standards is first presented, then the current status and future direction of the ongoing standards development activities are discussed.

  1. 2001年IEEE MTT-S介绍

    Institute of Scientific and Technical Information of China (English)

    洪伟

    2001-01-01

    @@ 2001年IEEE微波理论与技术国际会议(IEEE MTT-S)于5月20~25日在美国的凤凰城(Phoenix) 召开.其中,20、21和25日安排的是专题讨论会(Workshops)等,22~24日为分组学术报告. 本次会议共收到学术论文930篇,其中学生投稿论文242篇,这两项都刷新了MTT-S的记录. 经过250位专家的评审,从中录用了511篇论文,录用率为55%.这些学术论文安排在22~24三天的65个分组内进行学术交流,其中除了论文宣读(presentation)之外还在每天的下午安排了论文张贴交流(interactive forum).根据当前的热门研究领域,会议安排了20个专题讨论会(Workshop)和5个短课程(Short courses).此外,针对一些浮现出来的技术领域还设了 5个焦点分组(Focused sessions)、4个专题讨论会(Panel sessions)和1个辩论会(Rump s ession).与MTT-S联合召开的还有射频集成电路(RFIC)和自动射频技术组(ARFTG: Automat ic RF Technology Group)两个专门会议.在会议期间还举办了规模巨大的微波工业展览, 有800多家公司参展,展出的产品涉及微波毫米波元器件、模块、系统、芯片、测量设备、加工设备、设计软件等等.下面就这次会议的主要内容作简要介绍.一、分组学术交流 (Technique Sessions) 学术论文分65个组(Sessions)进行交流,内容涉及电磁场边值问题的分析方法、微波传输线与无源元件、封装与互连技术、非线性分析、微波有源器件、天线、智能天线、通信系统、卫星互连网、微波生物效应与医学应用、微波超导等.

  2. PREFACE: European Microbeam Analysis Society's 14th European Workshop on Modern Developments and Applications in Microbeam Analysis (EMAS 2015), Portorož, Slovenia, 3-7 May 2015

    Science.gov (United States)

    Llovet, Xavier; Matthews, Michael B.; Čeh, Miran; Langer, Enrico; Žagar, Kristina

    2016-02-01

    This volume of the IOP Conference Series: Materials Science and Engineering contains papers from the 14th Workshop of the European Microbeam Analysis Society (EMAS) on Modern Developments and Applications in Microbeam Analysis which took place from the 3rd to the 7th of May 2015 in the Grand Hotel Bernardin, Portorož, Slovenia. The primary aim of this series of workshops is to assess the state-of-the-art and reliability of microbeam analysis techniques. The workshops also provide a forum where students and young scientists starting out on a career in microbeam analysis can meet and discuss with the established experts. The workshops have a unique format comprising invited plenary lectures by internationally recognized experts, poster presentations by the participants and round table discussions on the key topics led by specialists in the field.This workshop was organized in collaboration with the Jožef Stefan Institute and SDM - Slovene Society for Microscopy. The technical programme included the following topics: electron probe microanalysis, STEM and EELS, materials applications, cathodoluminescence and electron backscatter diffraction (EBSD), and their applications. As at previous workshops there was also a special oral session for young scientists. The best presentation by a young scientist was awarded with an invitation to attend the 2016 Microscopy and Microanalysis meeting at Columbus, Ohio. The prize went to Shirin Kaboli, of the Department of Metals and Materials Engineering of McGill University (Montréal, Canada), for her talk entitled "Electron channelling contrast reconstruction with electron backscattered diffraction". The continuing relevance of the EMAS workshops and the high regard in which they are held internationally can be seen from the fact that 71 posters from 16 countries were on display at the meeting and that the participants came from as far away as Japan, Canada, USA, and Australia. A selection of participants with posters was invited

  3. Citizenship in civil society?

    NARCIS (Netherlands)

    Ossewaarde, Marinus R.R.

    2007-01-01

    This article seeks to provide a conceptual framework to complement and guide the empirical analysis of civil society. The core argument is that civil society must be understood, not as a category of (post)industrialized society, but as one of individualized society. Civil society is characterized by

  4. Implementation experiences of ISO/IEEE11073 standard applied to new use cases for e-health environments.

    Science.gov (United States)

    Martinez, I; Escayola, J; Martinez-Espronceda, M; Serrano, L; Trigo, J D; Led, S; Garcia, J

    2009-01-01

    Recent advances in biomedical engineering and continuous technological innovations in last decade are promoting new challenges, especially in e-Health environments. In this context, the medical devices interoperability is one of the interest fields wherein these improvements require a standard-based design in order to achieve homogeneous solutions. Furthermore, the spreading of wearable devices, oriented to the paradigm of patient environment and supported by wireless technologies as Bluetooth or ZigBee, is bringing new medical use cases based on Ambient Assisted Living, home monitoring of elderly, heart failure, chronic, under palliative care or patients who have undergone surgery, urgencies and emergencies, or even fitness auto-control and health follow-up. In this paper, several implementation experiences based on ISO/IEEE11073 standard are detailed. These evolved e-Health services can improve the quality of the patient's care, increase the user's interaction, and assure these e-Health applications to be fully compatible with global telemedicine systems.

  5. 17th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing

    CERN Document Server

    SNPD 2016

    2016-01-01

    This edited book presents scientific results of the 17th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2016) which was held on May 30 - June 1, 2016 in Shanghai, China. The aim of this conference was to bring together researchers and scientists, businessmen and entrepreneurs, teachers, engineers, computer users, and students to discuss the numerous fields of computer science and to share their experiences and exchange new ideas and information in a meaningful way. Research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them.

  6. 6th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing

    CERN Document Server

    2016-01-01

    This edited book presents scientific results of the 16th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD 2015) which was held on June 1 – 3, 2015 in Takamatsu, Japan. The aim of this conference was to bring together researchers and scientists, businessmen and entrepreneurs, teachers, engineers, computer users, and students to discuss the numerous fields of computer science and to share their experiences and exchange new ideas and information in a meaningful way. Research results about all aspects (theory, applications and tools) of computer and information science, and to discuss the practical challenges encountered along the way and the solutions adopted to solve them.

  7. Performance Analysis of Sleep Mode Operation in IEEE 802.16m Mobile WiMAX

    Science.gov (United States)

    Baek, Sangkyu; Son, Jung Je; Choi, Bong Dae

    We mathematically analyze the sleep mode operation of IEEE 802.16m. The sleep mode operation for downlink traffic is modeled as a 3-dimensional discrete time Markov chain. We obtain the average power consumption of a mobile station and the average delay of a message. Numerical results match simulations very well. Numerical results show that there is a tradeoff between power consumption and message delay. We find the optimal lengths of sleep cycle and close-down time that minimize the power consumption while satisfying the quality of service (QoS) constraint on message delay. The power consumption of the sleep mode in IEEE 802.16m is better than that of sleep modes in legacy IEEE 802.16e standard under the same delay bound.

  8. An Analytical Model for the Performance Analysis of Concurrent Transmission in IEEE 802.15.4

    Directory of Open Access Journals (Sweden)

    Cengiz Gezer

    2014-03-01

    Full Text Available Interference is a serious cause of performance degradation for IEEE802.15.4 devices. The effect of concurrent transmissions in IEEE 802.15.4 has been generally investigated by means of simulation or experimental activities. In this paper, a mathematical framework for the derivation of chip, symbol and packet error probability of a typical IEEE 802.15.4 receiver in the presence of interference is proposed. Both non-coherent and coherent demodulation schemes are considered by our model under the assumption of the absence of thermal noise. Simulation results are also added to assess the validity of the mathematical framework when the effect of thermal noise cannot be neglected. Numerical results show that the proposed analysis is in agreement with the measurement results on the literature under realistic working conditions.

  9. An Analytical Model for the Performance Analysis of Concurrent Transmission in IEEE 802.15.4

    Science.gov (United States)

    Gezer, Cengiz; Zanella, Alberto; Verdone, Roberto

    2014-01-01

    Interference is a serious cause of performance degradation for IEEE802.15.4 devices. The effect of concurrent transmissions in IEEE 802.15.4 has been generally investigated by means of simulation or experimental activities. In this paper, a mathematical framework for the derivation of chip, symbol and packet error probability of a typical IEEE 802.15.4 receiver in the presence of interference is proposed. Both non-coherent and coherent demodulation schemes are considered by our model under the assumption of the absence of thermal noise. Simulation results are also added to assess the validity of the mathematical framework when the effect of thermal noise cannot be neglected. Numerical results show that the proposed analysis is in agreement with the measurement results on the literature under realistic working conditions. PMID:24658624

  10. An analytical model for the performance analysis of concurrent transmission in IEEE 802.15.4.

    Science.gov (United States)

    Gezer, Cengiz; Zanella, Alberto; Verdone, Roberto

    2014-03-20

    Interference is a serious cause of performance degradation for IEEE802.15.4 devices. The effect of concurrent transmissions in IEEE 802.15.4 has been generally investigated by means of simulation or experimental activities. In this paper, a mathematical framework for the derivation of chip, symbol and packet error probability of a typical IEEE 802.15.4 receiver in the presence of interference is proposed. Both non-coherent and coherent demodulation schemes are considered by our model under the assumption of the absence of thermal noise. Simulation results are also added to assess the validity of the mathematical framework when the effect of thermal noise cannot be neglected. Numerical results show that the proposed analysis is in agreement with the measurement results on the literature under realistic working conditions.

  11. PERFORMANCE STUDY OF DISTRIBUTED COORDINATION FUNCTION OVER IEEE 802.11A PHYSICAL LAYER

    Directory of Open Access Journals (Sweden)

    S. SELVAKENEDDY

    2006-06-01

    Full Text Available IEEE 802.11a is one of the latest standards to be released by the IEEE Project 802 for wireless LANs. It has specified an additional physical layer (PHY to support higher data rates, and is termed as the orthogonal frequency division multiplexing (OFDM. In order to exploit its benefits, one of the medium access control (MAC protocols specified in the IEEE 802.11 specification is called distributed coordination function (DCF. DCF is a carrier sense multiple access with collision avoidance (CSMA/CA scheme with slotted binary exponential backoff. The frames can be transmitted using the basic access scheme or the RTS/CTS scheme in DCF. It was demonstrated previously that the RTS/CTS mechanism works well in most scenarios for the previously specified PHYs. In this work, a simple simulator is developed to verify the scalability of the RTS/CTS mechanism over OFDM PHY, which supports much higher data rates.

  12. 基于IEEE 1149.X标准的测试技术研究%Research of the Test Techniques Based on IEEE 1149.X

    Institute of Scientific and Technical Information of China (English)

    姜鹏; 沈绪榜

    2004-01-01

    IEEE1149标准及其子标准是基于边界扫描的测试技术,它们针对不同的应用环境采用相应的技术标准.它们所提供的解决方案极大地方便了芯片级、板级、系统级及数字网络的测试.本文讨论了IEEE1149.X中各标准的原理、结构,分析了各项技术的发展及应用,并举例说明了在实际中的测试应用.

  13. 结合案例探讨IEEE 802.X协议检索策略%Analysis of Search of IEEE 802.X Protocol Associated with Actual Cases

    Institute of Scientific and Technical Information of China (English)

    李玉萍

    2015-01-01

    在涉及IEEE 802.X的发明专利申请的检索过程中,仅在专利数据库中很难检索到与专利申请最接近的现有技术,常常需要转到非专利数据库进行检索,通过两个实际案例,探讨了如何对涉及IEEE 802.X协议的发明专利申请进行有效检索,从而提出一种准确、快速、高效地检索现有技术的方法,为审查工作提供参考,也为该领域的发明人、申请人提供更多的现有技术检索思路和方式.

  14. Society of Reproductive Surgeons

    Science.gov (United States)

    ... affiliated society to the American Society for Reproductive Medicine . Below are links to publications authored by ASRM and its affiliated societies. Latest Additions: Diagnostic Testing for Male Factor Infertility Robotic surgery The Intrauterine Device (IUD): A Long-acting ...

  15. IEEE 802.15.4 Frame Aggregation Enhancement to Provide High Performance in Life-Critical Patient Monitoring Systems.

    Science.gov (United States)

    Akbar, Muhammad Sajjad; Yu, Hongnian; Cang, Shuang

    2017-01-28

    In wireless body area sensor networks (WBASNs), Quality of Service (QoS) provision for patient monitoring systems in terms of time-critical deadlines, high throughput and energy efficiency is a challenging task. The periodic data from these systems generates a large number of small packets in a short time period which needs an efficient channel access mechanism. The IEEE 802.15.4 standard is recommended for low power devices and widely used for many wireless sensor networks applications. It provides a hybrid channel access mechanism at the Media Access Control (MAC) layer which plays a key role in overall successful transmission in WBASNs. There are many WBASN's MAC protocols that use this hybrid channel access mechanism in variety of sensor applications. However, these protocols are less efficient for patient monitoring systems where life critical data requires limited delay, high throughput and energy efficient communication simultaneously. To address these issues, this paper proposes a frame aggregation scheme by using the aggregated-MAC protocol data unit (A-MPDU) which works with the IEEE 802.15.4 MAC layer. To implement the scheme accurately, we develop a traffic patterns analysis mechanism to understand the requirements of the sensor nodes in patient monitoring systems, then model the channel access to find the performance gap on the basis of obtained requirements, finally propose the design based on the needs of patient monitoring systems. The mechanism is initially verified using numerical modelling and then simulation is conducted using NS2.29, Castalia 3.2 and OMNeT++. The proposed scheme provides the optimal performance considering the required QoS.

  16. 基于IEEE802.16e睡眠模式的研究%Performance analysis of sleep mode operation in IEEE802.16e

    Institute of Scientific and Technical Information of China (English)

    顾俊杰; 杨宇航

    2009-01-01

    The IEEE802.16e is a standard of emerging broadband wireless access system which supports the mobility. The mobile subscribers (MSS) are mainly powered by the batteries, so the sleep mode mechanism becomes an important component for the MSS which can effectively manage the limited energy, and prolong the using time of the once-charged batteries.This paper introduced the standardized sleep mode in IEEE802.16e,then it analyzed the average energy consumption and the average packet delay under sleep mode by building a semi-Markov chain,and gave the simulation results by NS2 at last.%IEEE802.16e标准是支持终端移动性的无线城域网接人标准.由于移动终端是由电池供电的,而休眠模式作为其必备功能,能有效管理其有限的电池容量,延长其单次充电使用时间.首先介绍了IEEE802.16e标准建议的睡眠模式,然后通过建立马尔可夫链模型对睡眠模式下的平均能量消耗及平均包延迟进行分析,最后NS2工具对分析结果进行NS2仿真和讨论.

  17. Research of Bus Signals Extension in IEEE Std 1641-2010%IEEE Std 1641中总线类信号扩展方法研究

    Institute of Scientific and Technical Information of China (English)

    陈育良; 牛双诚; 曲晓燕

    2012-01-01

    With a 4 layers model, IEEE Std 1641 - 2010 provides the capability to describe and control signals, but not include one of the most important signal, bus signals. After researching way of bus signals extension in C/ATLAS, this paper gives an model of bus instruments using the reference of its designing idea, and accomplish bus signals extension by extending new signals. It also gives TPL statement of new signals. Using this method, it fulfill test well in an ATS.%IEEE Std 1641-2010中提出STD四层结构模型,完成信号的描述和控制功能,但没有提供总线信号定义和描述,而总线信号则是自动测试中最重要信号之一;针对此问题,文中通过深入研究C/ATLAS中总线类信号的扩展方法,借鉴其设计思想,提出了满足IEEE Std 1641设计思想和原则的总线信号仪器模型,通过扩展新信号的方法完成多种总线信号扩展,并给出其TPL语言支持,经实际系统中使用,很好地完成了测试测量功能.

  18. 面向IEEE 802.16e的高效LDPC编码器设计%Design of High Efficient LDPC Encoder in IEEE 802.16e

    Institute of Scientific and Technical Information of China (English)

    李书洋; 胡剑浩; 陈杰男

    2012-01-01

    基于矩阵乘法的高斯消元法提出了一种通用的LDPC编码器结构,该结构使用移位寄存器和简单的选线实现了复杂的矩阵向量相乘运算并且不需要存储庞大的校验矩阵.然后根据IEEE 802.16e标准中对校验矩阵的定义,利用FPGA实现了编码器的硬件结构,并且由仿真结果可知这种LDPC编码器结构降低了逻辑资源开销,提高了编码速度.%In this paper, a high efficient LDPC encoder structure is proposed for IEEE 802. 16e with Gaussian elimination algorithm based on matrix multiplication. The matrix-vector multiplication is implemented with a shift register and a simple line selection in the proposed encoder, which is memory free structure for check matrix. According to IEEE 802.16e, the proposed encoder is implemented with FPGA. Compared with existing LDPC encoder, the proposed scheme can provide higher speed of encoding with less logic resources.

  19. IEEE 802.11e (EDCA analysis in the presence of hidden stations

    Directory of Open Access Journals (Sweden)

    Xijie Liu

    2011-07-01

    Full Text Available The key contribution of this paper is the combined analytical analysis of both saturated and non-saturated throughput of IEEE 802.11e networks in the presence of hidden stations. This approach is an extension to earlier works by other authors which provided Markov chain analysis to the IEEE 802.11 family under various assumptions. Our approach also modifies earlier expressions for the probability that a station transmits a packet in a vulnerable period. The numerical results provide the impact of the access categories on the channel throughput. Various throughput results under different mechanisms are presented.

  20. A New Analytic Method for IEEE 802.11 Distributed Coordination Function

    Science.gov (United States)

    Hwang, Gang Uk; Chung, Min Young; Lee, Yutae

    In this paper, we consider a network of N identical IEEE 802.11 DCF (Distributed Coordination Function) terminals with RTS/CTS mechanism, each of which is assumed to be saturated. For performance analysis, we propose a simple and efficient mathematical model to derive the statistical characteristics of the network such as the inter-transmission time of packets in the network and the service time (the inter-transmission time of successful packet transmissions) of the network. Numerical results and simulations are provided to validate the accuracy of our model and to study the performance of the IEEE 802.11 DCF network.

  1. BER Analysis Of IEEE802.11n MIMO System Using MMSE And ZF Detectors

    Directory of Open Access Journals (Sweden)

    Ye Lwin Oo

    2015-06-01

    Full Text Available Abstract With the increasing demand of higher data rate for telecommunication the IEEE802.11n standard was constituted in 2009. The most important character of the standard is MIMO-OFDM which not only improves the throughput but also the spectrum efficiency and channel capacity. And in wireless communication the role of MIMO detectors plays an important part to remove inter-symbol interference ISI caused by multipath fading channel. In this paper the BER performance of IEEE 802.11n for 3x2 4x2 and 4x3 antennas are compared using MMSE and ZF detectors in Matlab Simulink.

  2. Direct Sequence Spread Spectrum Steganographic Scheme for IEEE 802.15.4

    CERN Document Server

    Zielinska, Elzbieta

    2011-01-01

    This work addresses the issues related to network steganography in IEEE 802.15.4 Wireless Personal Area Networks (WPAN). The proposed communication scheme employs illicit Direct Sequence Spread Spectrum code sequences for the transmission of steganographic data. The presented approach is a compromise between minimising the probability of covert channel disclosure and providing robustness against random errors and a high steganographic data rate. The conducted analyses show that it is possible to create a covert channel with a data rate comparable to the raw data rate of IEEE 802.15.4 without much impact on the perceived receiver sensitivity, the Chip Error Rate and the Bit Error Rate.

  3. IEEE 802.17与弹性分组环

    Institute of Scientific and Technical Information of China (English)

    马上; 马立香

    2004-01-01

    2004年6月发布的IEEE802.1 7标准规范了弹性分组环(RPR)技术.RPR针对承载IP业务进行优化,是构建IP城域网极具潜力的技术.本文概述IEEE 802.17/RPR技术,重点概述RPR的带宽分配、空间重用、自动拓扑发现及保护等关键技术,比较分析RPR相对其它城域网技术的优势.

  4. Queuing Analysis for IEEE 802.11e Networks in Non-Saturation Environments

    Directory of Open Access Journals (Sweden)

    Eui-Jik Kim

    2012-04-01

    Full Text Available This paper presents an analytical model for the performance evaluation of an IEEE 802.11e network in non‐saturation environments. We first characterize the probability distribution of the MAC layer packet service time. Based on the probability distribution model of the MAC layer packet service time, we then study the queuing performance of the wireless local area networks (WLANs at different traffic loads based on the IEEE 802.11e MAC protocol. The numerical results show that we can choose a feasible number and bandwidth of the node which determines the system performance that a user demands.

  5. Analysis Of Impact Of Various Parameters On BER Performance For IEEE 802.11b

    Directory of Open Access Journals (Sweden)

    Nilesh B. Kalani

    2015-08-01

    Full Text Available Abstract This paper discusses about IEEE 802.11b simulation model implemented using LabVIEW software and its analyses for impact on bit error rate BER for different parameters as channel type channel number data transmission rate and packet size. Audio file is being transmitted processed and analyzed using the model for various parameters. This paper gives analysis of BER verses ESN0 for various parameter like data rate packet size and communication channel for the IEEE 802.11b simulation model generated using LabVIEW. It is proved that BER can be optimized by tweaking different parameters of wireless communication system.

  6. Reactive GTS Allocation Protocol for Sporadic Events Using the IEEE 802.15.4

    Directory of Open Access Journals (Sweden)

    Mukhtar Azeem

    2014-01-01

    by the IEEE 802.15.4 standard. The proposed control protocol ensures that a given offline sporadic schedule can be adapted online in a timely manner such that the static periodic schedule has not been disturbed and the IEEE 802.15.4 standard compliance remains intact. The proposed protocol is simulated in OPNET. The simulation results are analyzed and presented in this paper to prove the correctness of the proposed protocol regarding the efficient real-time sporadic event delivery along with the periodic event propagation.

  7. NREL preprints for the 23rd IEEE Photovoltaic Specialists Conference

    Energy Technology Data Exchange (ETDEWEB)

    Fitzgerald, M. [ed.

    1993-05-01

    Topics covered include various aspects of solar cell fabrication and performance. Aluminium-gallium arsenides, cadmium telluride, amorphous silicon, and copper-indium-gallium selenides are all characterized in their applicability in solar cells.

  8. First Euro-China Conference on Intelligent Data Analysis and Applications

    CERN Document Server

    Snasel, Vaclav; Corchado, Emilio; Abraham, Ajith; Wang, Shyue-Liang

    2014-01-01

    The First Euro-China Conference on Intelligent Data Analysis and Applications (ECC 2014), which was hosted by Shenzhen Graduate School of Harbin Institute of Technology and was held in Shenzhen City on June 13-15, 2014. ECC 2014 was technically co-sponsored by Shenzhen Municipal People’s Government, IEEE Signal Processing Society, Machine Intelligence Research Labs, VSB-Technical University of Ostrava (Czech Republic), National Kaohsiung University of Applied Sciences (Taiwan), and Secure E-commerce Transactions (Shenzhen) Engineering Laboratory of Shenzhen Institute of Standards and Technology.

  9. Mobile Bearer network Security Synchronization Method Based on IEEE 1588v2%基于IEEE 1588v2的移动承载网安全同步方法

    Institute of Scientific and Technical Information of China (English)

    许磊; 刘敏; 戚湧; 吕艳

    2013-01-01

    随着智能手机的出现和迅速普及,移动宽带市场进入了一个高速发展的阶段。网络IP化是近年来电信运营商网络发展的必然趋势,移动网络的IP化只是一个接口的改变,而移动承载网络的IP化则涉及端到端的网络演进涉及网络管理、保护、故障定位等诸多因素。本文针对当前移动承载网络对安全同步的要求,结合IEEE 1588v2标准和原理,设计了安全同步算法,满足移动承载网的需求。%Along with the emergence of smart phones, the rapid spread of mobile broadband market has entered a stage of rapid development. IP networks in recent years the trend has been the development of telecommunications network operators inevitable trend of mobile IP-based network is just an interface change, and mobile bearer network end to end IP-based network evolution involves the related network management, protection, fault location, etc. many other factors. This paper proposed a security method to meet the IEEE 1588v2 needs. Analysis of the current mobile bearer network synchronization requirements, combined with the practical application of the network model, this method may elaborate on how to meet the requirements of mobile bearer network.

  10. Microarray application in prenatal diagnosis: a position statement from the cytogenetics working group of the Italian Society of Human Genetics (SIGU), November 2011.

    Science.gov (United States)

    Novelli, A; Grati, F R; Ballarati, L; Bernardini, L; Bizzoco, D; Camurri, L; Casalone, R; Cardarelli, L; Cavalli, P; Ciccone, R; Clementi, M; Dalprà, L; Gentile, M; Gelli, G; Grammatico, P; Malacarne, M; Nardone, A M; Pecile, V; Simoni, G; Zuffardi, O; Giardino, D

    2012-04-01

    A precise guideline establishing chromosomal microarray analysis (CMA) applications and platforms in the prenatal setting does not exist. The controversial question is whether CMA technologies can or should soon replace standard karyotyping in prenatal diagnostic practice. A review of the recent literature and survey of the knowledge and experience of all members of the Italian Society of Human Genetics (SIGU) Committee were carried out in order to propose recommendations for the use of CMA in prenatal testing. The analysis of datasets reported in the medical literature showed a considerable 6.4% incidence of pathogenic copy number variations (CNVs) in the group of pregnancies with sonographically detected fetal abnormalities and normal karyotype. The reported CNVs are likely to have a relevant role in terms of nosology for the fetus and in the assessment of reproductive risk for the couple. Estimation of the frequency of copy number variations of uncertain significance (VOUS) varied depending on the different CMA platforms used, ranging from 0-4%, obtained using targeted arrays, to 9-12%, obtained using high-resolution whole genome single nucleotide polymorphism (SNP) arrays. CMA analysis can be considered a second-tier diagnostic test to be used after standard karyotyping in selected groups of pregnancies, namely those with single (apparently isolated) or multiple ultrasound fetal abnormalities, those with chromosomal rearrangements, even if apparently balanced, and those with supernumerary marker chromosomes.

  11. Guidelines for the intravenous application of recombinant tissue-type plasminogen activator (alteplase), the second edition, October 2012: a guideline from the Japan Stroke Society.

    Science.gov (United States)

    Minematsu, Kazuo; Toyoda, Kazunori; Hirano, Teruyuki; Kimura, Kazumi; Kondo, Rei; Mori, Etsuro; Nakagawara, Jyoji; Sakai, Nobuyuki; Shiokawa, Yoshiaki; Tanahashi, Norio; Yasaka, Masahiro; Katayama, Yasuo; Miyamoto, Susumu; Ogawa, Akira; Sasaki, Makoto; Suga, Sadao; Yamaguchi, Takenori

    2013-07-01

    In Japan, intravenous alteplase, a recombinant tissue-type plasminogen activator (rt-PA), was approved for an indication of ischemic stroke in 2005 on the basis of the results of a clinical trial with a unique dose of the drug (0.6 mg/kg). The Japan Stroke Society published the guidelines for intravenous application of rt-PA and organized training sessions for proper use all over Japan in an effort to promote the safe, widespread use of intravenous alteplase. Seven years following its approval, clinical experience with intravenous alteplase has accumulated, additional evidence of intravenous alteplase has been found in Japan and overseas, and the medical environment has substantially changed, including approvals for new drugs and medical devices. Notably, the use of alteplase in the extended therapeutic time window (within 4.5 hours of symptom onset) became covered by insurance in Japan in August 2012. To address these changing situations, we have decided to prepare the revised guidelines. In preparing the second edition, we took care to make its contents more practical by emphasizing information needed in clinical practice. While the first edition was developed with emphasis on safety in light of limited clinical experience with intravenous alteplase in Japan in 2005, this second edition is a substantial revision of the first edition mainly in terms of eligibility criteria, on the basis of accumulated evidence and the clinical experience.

  12. IEEE802.15.4协议性能分析实验设计与实现%Experimental Design and Implementation of IEEE 802.15.4 Protocol Performance Analysis

    Institute of Scientific and Technical Information of China (English)

    欧阳国军; 赵艳玲

    2016-01-01

    为了探索IEEE802.15.4协议实验教学,首先对实验内容进行了归纳,然后应用IEEE802.15.4/ZigBee仿真模型设计了IEEE802.15.4协议性能分析实验方案,详细给出IEEE802.15.4/ZigBee仿真模型的参数配置,最后分析了参数SO、BO、NB、BE和负载对网络性能的影响.该实验方案应用到教学中,加强了学生对抽象、复杂知识的理解,填补了IEEE802.15.4协议教学中的一项空白.

  13. An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

    Directory of Open Access Journals (Sweden)

    Marco Passafiume

    2017-03-01

    Full Text Available Assuming a reliable and responsive spatial contextualization service is a must-have in IEEE 802.11 and 802.15.4 wireless networks, a suitable approach consists of the implementation of localization capabilities, as an additional application layer to the communication protocol stack. Considering the applicative scenario where satellite-based positioning applications are denied, such as indoor environments, and excluding data packet arrivals time measurements due to lack of time resolution, received signal strength indicator (RSSI measurements, obtained according to IEEE 802.11 and 802.15.4 data access technologies, are the unique data sources suitable for indoor geo-referencing using COTS devices. In the existing literature, many RSSI based localization systems are introduced and experimentally validated, nevertheless they require periodic calibrations and significant information fusion from different sensors that dramatically decrease overall systems reliability and their effective availability. This motivates the work presented in this paper, which introduces an approach for an RSSI-based calibration-free and real-time indoor localization. While switched-beam array-based hardware (compliant with IEEE 802.15.4 router functionality has already been presented by the author, the focus of this paper is the creation of an algorithmic layer for use with the pre-existing hardware capable to enable full localization and data contextualization over a standard 802.15.4 wireless sensor network using only RSSI information without the need of lengthy offline calibration phase. System validation reports the localization results in a typical indoor site, where the system has shown high accuracy, leading to a sub-metrical overall mean error and an almost 100% site coverage within 1 m localization error.

  14. An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks.

    Science.gov (United States)

    Passafiume, Marco; Maddio, Stefano; Cidronali, Alessandro

    2017-03-29

    Assuming a reliable and responsive spatial contextualization service is a must-have in IEEE 802.11 and 802.15.4 wireless networks, a suitable approach consists of the implementation of localization capabilities, as an additional application layer to the communication protocol stack. Considering the applicative scenario where satellite-based positioning applications are denied, such as indoor environments, and excluding data packet arrivals time measurements due to lack of time resolution, received signal strength indicator (RSSI) measurements, obtained according to IEEE 802.11 and 802.15.4 data access technologies, are the unique data sources suitable for indoor geo-referencing using COTS devices. In the existing literature, many RSSI based localization systems are introduced and experimentally validated, nevertheless they require periodic calibrations and significant information fusion from different sensors that dramatically decrease overall systems reliability and their effective availability. This motivates the work presented in this paper, which introduces an approach for an RSSI-based calibration-free and real-time indoor localization. While switched-beam array-based hardware (compliant with IEEE 802.15.4 router functionality) has already been presented by the author, the focus of this paper is the creation of an algorithmic layer for use with the pre-existing hardware capable to enable full localization and data contextualization over a standard 802.15.4 wireless sensor network using only RSSI information without the need of lengthy offline calibration phase. System validation reports the localization results in a typical indoor site, where the system has shown high accuracy, leading to a sub-metrical overall mean error and an almost 100% site coverage within 1 m localization error.

  15. Evaluation of the Effects of Hidden Node Problems in IEEE 802.15.7 Uplink Performance

    Directory of Open Access Journals (Sweden)

    Carlos Ley-Bosch

    2016-02-01

    Full Text Available In the last few years, the increasing use of LEDs in illumination systems has been conducted due to the emergence of Visible Light Communication (VLC technologies, in which data communication is performed by transmitting through the visible band of the electromagnetic spectrum. In 2011, the Institute of Electrical and Electronics Engineers (IEEE published the IEEE 802.15.7 standard for Wireless Personal Area Networks based on VLC. Due to limitations in the coverage of the transmitted signal, wireless networks can suffer from the hidden node problems, when there are nodes in the network whose transmissions are not detected by other nodes. This problem can cause an important degradation in communications when they are made by means of the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA access control method, which is used in IEEE 802.15.7 This research work evaluates the effects of the hidden node problem in the performance of the IEEE 802.15.7 standard We implement a simulator and analyze VLC performance in terms of parameters like end-to-end goodput and message loss rate. As part of this research work, a solution to the hidden node problem is proposed, based on the use of idle patterns defined in the standard. Idle patterns are sent by the network coordinator node to communicate to the other nodes that there is an ongoing transmission. The validity of the proposed solution is demonstrated with simulation results.

  16. Performance Analysis of Non-saturated IEEE 802.11 DCF Networks

    Science.gov (United States)

    Zhai, Linbo; Zhang, Xiaomin; Xie, Gang

    This letter presents a model with queueing theory to analyze the performance of non-saturated IEEE 802.11 DCF networks. We use the closed queueing network model and derive an approximate representation of throughput which can reveal the relationship between the throughput and the total offered load under finite traffic load conditions. The accuracy of the model is verified by extensive simulations.

  17. Performance characterization of the IEEE 802.11 signal transmission over a multimode fiber PON

    Science.gov (United States)

    Maksymiuk, L.; Siuzdak, J.

    2014-11-01

    In this paper there are presented measurements concerning performance analysis of the IEEE 802.11 signal distribution over multimode fiber based passive optical network. In the paper there are addressed three main sources of impairments: modal noise, frequency response fluctuation of the multimode fiber and non-linear distortion of the signal in the receiver.

  18. Some problems of implementation: ANSI/IEEE Std 1149.1 in microcontroller design

    Science.gov (United States)

    Adamkiewicz, Hubert; Glinski, Krzysztof; Lewandowski, Artur

    1992-08-01

    The paper presents some problems of implementation ANSI/IEEE Std 1149.1 worked out in the Industrial Institute of Electronics (PIE) microcontroller board. Diagnostic properties of some special hardware solutions and examples of testing procedures are described. Testing was performed with the help of the PIE diagnostic bus analyzer.

  19. Interference Measurements in IEEE 802.11 Communication Links Due to Different Types of Interference Sources

    NARCIS (Netherlands)

    Bloem, van Jan-Willem; Schiphorst, Roel; Kluwer, Taco; Slump, Cornelis H.

    2012-01-01

    The number of wireless devices (smartphones, laptops, sensors) that use the 2.4 GHz ISM band is rapidly increasing. The most common communication system in this band is Wi-Fi (IEEE 802.11b/g/n). For that reason coexistence between Wi-Fi and other systems becomes more and more important. In this pape

  20. Analysis of the IEEE 802.20 norm as the standard for developing new wireless technologies

    Directory of Open Access Journals (Sweden)

    Danilo A López Sarmiento

    2015-10-01

    Full Text Available This paper aims to compile existing information on the IEEE 802.20 standard and unify it in a document that will serve as support for parties interested in conducting research and / or projects related to wireless technologies.

  1. Interference Mitigation in IEEE 802.15.4-A Cluster Based Scheduling Approach

    Directory of Open Access Journals (Sweden)

    G. M. Tamilselvan

    2011-01-01

    Full Text Available Problem statement: In universal networking environments; two or more heterogeneous communication systems coexisting in a single place. Especially, Wireless Local Area Networks (WLANs based on IEEE 802.11b specifications and Wireless Personal Area Networks (WPANs based on IEEE 802.15.4 specifications need to coexist in the same Industrial, Science and Medial (ISM band. If the WPAN communication coverage is expanded using a cluster-tree network topology, then the 802.15.4 network is more susceptible to interference from neighboring WLANs. Approach: In this study, we propose an adaptive transmission power aware cluster scheduling algorithm using multiple channels in a WPAN in the presence of WLAN interference. Results: The algorithm includes node identification, channel allocation, clustering and time scheduling. To evaluate the performance of the proposed algorithm, the performance metrics such as Bit error, Packet Error Rate (PER, Throughput, Average End-End Delay and Average Jitter is measured through Qualnet simulation. PER is calculated from bit error rate. The simulation results are compared with the conventional TDMA scheme. Conclusion/Recommendations: The measurement result shows that the proposed algorithm is effective in an IEEE 802.15.4 cluster-tree network in the presence of multiple IEEE 802.11 interferers.

  2. Analyzing Performance for Mutual Authentication Mechanism for Wimax: IEEE 802.16e

    Directory of Open Access Journals (Sweden)

    Mrs. R. C. Roychaudhary

    2014-02-01

    Full Text Available The IEEE 802.16 designed to operate in the 10-66 GHz spectrum and it specifies the physical layer (PHY and medium access control layer (MAC of the air interface BWA systems. At 10-66 GHz range, transmission requires Line-of-Sight (LOS. IEEE 802.16 is working group number 16 of IEEE 802, specializing in point-tomultipoint broadband wireless access. The IEEE 802.16 Working Group created a new standard, commonly known as WiMAX, for broadband wireless access at high speed and low cost, which is easy to deploy, and which provides a scalable solution for extension of a fiber-optic backbone. WiMAX base stations can offer greater wireless coverage of about 5 miles, with LOS (line of sight transmission within bandwidth of up to 70 Mbps. WiMAX operates on the same general principles as WiFi -- it sends data from one computer to another via radio signals. A computer (either a desktop or a laptop equipped with WiMAX would receive data from the WiMAX transmitting station, probably using encrypted data keys to prevent unauthorized users from stealing access. The fastest WiFi connection can transmit up to 54 megabits per second under optimal conditions. WiMAX should be able to handle up to 70 megabits per second.

  3. Implementation of IEEE 802.15.4a Based UWB Systems for Coexistence with Primary Users

    Directory of Open Access Journals (Sweden)

    Caglar Findikli

    2016-03-01

    Full Text Available Peaceful coexistence is a major implementation issuefor both cognitive radios and ultra wideband (UWB systems.Accordingly, the UWB impulse radio (UWB-IR based WirelessPersonal Area Network (WPAN standard IEEE 802.15.4a hassuggested using linear combination of pulse to limit interfer-ence to coexisting primary systems. In this paper, motivatedby implementing the IEEE 802.15.4a based UWB-IR systemsfor peaceful coexistence, we consider the implementation oflinear combination of pulses as suggested by the standard.Accordingly, we (i design possible linearly combined pulses thatconform to the standard requirements, (ii consider coherentand noncoherent receiver structures that can be adapted for thephysical layer of the IEEE 802.15.4a standard, (iii investigatethe effect of channel models on the system performance, and(iv study the UWB-IR system performance in the presenceof narrowband and orthogonal frequency division multiplexing(OFDM based wideband primary systems with various band-widths and subcarriers. The study shows that the UWB-IR systemperformance can be significantly improved by selecting suitablepulses for transmission and employing appropriate filteringtechniques at the receiver when the primary system is active.For the implementation of IEEE 802.15.4a based UWB systemscomplying with coexistence requirements, the results of this studyshould be carefully considered.

  4. IEEE Radio and Wireless Symposium Student Awards Support Request: 2010-2012

    Science.gov (United States)

    2012-01-01

    Trasser, Sebastien Chartier , Hermann Schumacher. Analog Synchronous Receiver for Multi-Gigabit Wireless Communications, IEEE Radio and Wireless...Receiver for Multi-Gigabit Wireless Communications Cagri Ulusoy*, Gang Liu*, Andreas Trasser*, S´ebastien Chartier # and Hermann Schumacher* Ulm University

  5. Analysis and design of an on-chip retargeting engine for IEEE 1687 networks

    NARCIS (Netherlands)

    Ibrahim, Ahmed; Kerkhoff, Hans G.

    2016-01-01

    IEEE 1687 (iJTAG) standard introduces a methodology for accessing the increasing number of embedded instruments found in modern System-on-Chips. Retargeting is defined by iJTAG as the procedure of translating instrument-level patterns to system-level scan vectors for a certain network organization.

  6. Analysis of Throughput GTS and SDS in IEEE 802.15.4

    Directory of Open Access Journals (Sweden)

    Abhinav Singh

    2012-03-01

    Full Text Available the current IEEE 802.15.4 standard restricts the beacon enabled approach to star networks, while they support multi-hop networking in mesh but with no synchronization. In this paper there is proposal of a GTS with superframe scheduling for the chain network and throughput is observed.

  7. Performance Modeling of a Bottleneck Node in an IEEE 802.11 Ad-hoc Network

    NARCIS (Netherlands)

    Berg, van den Hans; Roijers, Frank; Mandjes, Michel R.H.; Kunz, T.; Ravi, S.S.

    2006-01-01

    The IEEE 802.11 MAC protocol, often used in ad-hoc networks, has the tendency to share the capacity equally amongst the active nodes, irrespective of their loads. An inherent drawback of this fair-sharing policy is that a node that serves as a relay-node for multiple flows is likely to become a bott

  8. Performance modelieg of a bottleneck node in an IEEE 802.11 ad-hoc network

    NARCIS (Netherlands)

    Berg, J.L. van den; Mandjes, M.; Roijers, F.

    2006-01-01

    The IEEE 802.11 MAC-protocol, often used in ad-hoc networks, has the tendency to share the capacity equally amongst the active nodes, irrespective of their loads. An inherent drawback of this fair-sharing policy is that a node that serves as a relay-node for multiple flows is likely to become a bott

  9. A Carrier Synchronization Algorithm for IEEE 802.11a System

    Institute of Scientific and Technical Information of China (English)

    WANG Chun-guang; ZHOU Zheng

    2004-01-01

    A new Carrier Frequency Offset (CFO) estimation algorithm for IEEE 80211a system is proposed. The extended Kalman filter (EKF) is applied to estimate the frequency offset in the acquisition stage and the cyclic prefix (CP) is used to correct the residual CFO in the tracking stage. Simulation results demonstrate the super performance of the proposed algorithm compared to Maximum-Likelihood (ML) approach.

  10. A Secure Simplification of the PKMv2 Protocol in IEEE 802.16e-2005

    DEFF Research Database (Denmark)

    Yuksel, Ender; Nielson, Hanne Riis; Nielsen, Christoffer Rosenkilde

    2007-01-01

    for IEEE 802.16e, PKMv2. This protocol seems to have an exaggerated mixture of security features. Thus, we iteratively investigate which components are necessary for upholding the security properties and which can be omitted safely. This approach is based on the LySa process calculus and employs...

  11. Adaptive Radio Resource Allocation in Hierarchical QoS Scheduling for IEEE 802.16 Systems

    DEFF Research Database (Denmark)

    Wang, Hua; Dittmann, Lars

    2007-01-01

    Future mobile communication systems such as IEEE 802.16 are expected to deliver a variety of multimedia services with diverse QoS requirements. To guarantee the QoS provision, appropriate scheduler architecture and scheduling algorithms have to be carefully designed. In this paper, we propose...

  12. Computer Controlled Test Systems. Introduction. A Course Based on the IEEE 488 Bus.

    Science.gov (United States)

    Herrmann, Eric J.

    An introductory course in computer automated tests and measurement systems based on the International Test Instrument-Computer Interface Standard, the IEEE (Institute of Electrical and Electronics Engineers)-488, is presented in this study guide. This course is designed to: (1) introduce the electronics engineering technician to the functional…

  13. Energy optimization based path selection algorithm for IEEE 802.11s wireless mesh networks

    CSIR Research Space (South Africa)

    Mhlanga, MM

    2011-09-01

    Full Text Available when the network is deployed in rural areas where electricity is a scarce resource. This research therefore presents an energy optimization based path selection algorithm for IEEE 802.11s WMNs which is aimed at addressing the above mentioned constrains...

  14. Evaluation of the Effects of Hidden Node Problems in IEEE 802.15.7 Uplink Performance.

    Science.gov (United States)

    Ley-Bosch, Carlos; Alonso-González, Itziar; Sánchez-Rodríguez, David; Ramírez-Casañas, Carlos

    2016-02-06

    In the last few years, the increasing use of LEDs in illumination systems has been conducted due to the emergence of Visible Light Communication (VLC) technologies, in which data communication is performed by transmitting through the visible band of the electromagnetic spectrum. In 2011, the Institute of Electrical and Electronics Engineers (IEEE) published the IEEE 802.15.7 standard for Wireless Personal Area Networks based on VLC. Due to limitations in the coverage of the transmitted signal, wireless networks can suffer from the hidden node problems, when there are nodes in the network whose transmissions are not detected by other nodes. This problem can cause an important degradation in communications when they are made by means of the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access control method, which is used in IEEE 802.15.7 This research work evaluates the effects of the hidden node problem in the performance of the IEEE 802.15.7 standard We implement a simulator and analyze VLC performance in terms of parameters like end-to-end goodput and message loss rate. As part of this research work, a solution to the hidden node problem is proposed, based on the use of idle patterns defined in the standard. Idle patterns are sent by the network coordinator node to communicate to the other nodes that there is an ongoing transmission. The validity of the proposed solution is demonstrated with simulation results.

  15. Energy-aware path selection metric for IEEE 802.11s wireless mesh networking

    CSIR Research Space (South Africa)

    Mhlanga, MM

    2009-01-01

    Full Text Available The IEEE 802.11s working group has commenced activities, which would lead to the development of a standard for wireless mesh networks (WMNs). The draft of 802.11s introduces a new path selection metric called airtime link metric. However...

  16. The IEEE-SA patent policy update under the lens of EU competition law

    NARCIS (Netherlands)

    Kanevskaia, Olia; Zingales, Nicolo

    2016-01-01

    In 2015, the Institute of Electrical and Electronics Engineers (IEEE) Standardization Association made some controversial changes to its patent policy. The changes include a recommended method of calculation of FRAND royalty rates, and a request to members holding a standard-essential patent to fore

  17. The IEEE-SA patent policy update under the lens of EU competition law

    NARCIS (Netherlands)

    Kanevskaia, Olia; Zingales, Nicolo

    2016-01-01

    In 2015, the Institute of Electrical and Electronics Engineers (IEEE) Standardization Association made some controversial changes to its patent policy. The changes include a recommended method of calculation of FRAND royalty rates, and a request to members holding a standard essential patent (SEP) t

  18. A Secure Simplification of the PKMv2 Protocol in IEEE 802.16e-2005

    DEFF Research Database (Denmark)

    Yuksel, Ender; Nielson, Hanne Riis; Nielsen, Christoffer Rosenkilde

    2007-01-01

    for IEEE 802.16e, PKMv2. This protocol seems to have an exaggerated mixture of security features. Thus, we iteratively investigate which components are necessary for upholding the security properties and which can be omitted safely. This approach is based on the LySa process calculus and employs...

  19. Computer Controlled Test Systems. Introduction. A Course Based on the IEEE 488 Bus.

    Science.gov (United States)

    Herrmann, Eric J.

    An introductory course in computer automated tests and measurement systems based on the International Test Instrument-Computer Interface Standard, the IEEE (Institute of Electrical and Electronics Engineers)-488, is presented in this study guide. This course is designed to: (1) introduce the electronics engineering technician to the functional…

  20. SELF-POWERED WIRELESS SENSOR NODE POWER MODELING BASED ON IEEE 802.11 COMMUNICATION PROTOCOL

    Energy Technology Data Exchange (ETDEWEB)

    Vivek Agarwal; Raymond A. DeCarlo; Lefteri H. Tsoukalas

    2016-04-01

    Design and technical advancements in sensing, processing, and wireless communication capabilities of small, portable devices known as wireless sensor nodes (WSNs) have drawn extensive research attention and are vastly applied in science and engineering applications. The WSNs are typically powered by a chemical battery source that has a load dependent finite lifetime. Most applications, including the nuclear industry applications, require WSNs to operate for an extended period of time beginning with their deployment. To ensure longevity, it is important to develop self-powered WSNs. The benefit of self-powered WSNs goes far beyond the cost savings of removing the need for cable installation and maintenance. Self-powered WSNs will potentially offer significant expansion in remote monitoring of nuclear facilities, and provide important data on plant equipment and component status during normal operation, as well as in case of abnormal operation, station blackouts or post-accident evaluation. Advancements in power harvesting technologies enable electric energy generation from many sources, including kinetic, thermal, and radiated energy. For the ongoing research at Idaho National Laboratory, a solid-state thermoelectric-based technology, the thermoelectric generator (TEG), is used to convert thermal energy to power a WSN. The design and development of TEGs to power WSNs that would remain active for a long period of time requires comprehensive understanding of WSN operational. This motivates the research in modeling the lifetime, i.e., power consumption, of a WSN by taking into consideration various node and network level activities. A WSN must perform three essential tasks: sense events, perform quick local information processing of sensed events, and wirelessly exchange locally processed data with the base station or with other WSNs in the network. Each task has a power cost per unit tine and an additional cost when switching between tasks. There are number of other

  1. Biomedical learning experiences for middle school girls sponsored by the Kansas State University Student Chapter of the IEEE EMBS.

    Science.gov (United States)

    Gruber, Lucinda; Griffith, Connor; Young, Ethan; Sullivan, Adriann; Schuler, Jeff; Arnold-Christian, Susan; Warren, Steve

    2009-01-01

    Learning experiences for middle school girls are an effective means to steer young women toward secondary engineering curricula that they might not have otherwise considered. Sponsorship of such experiences by a collegiate student group is worthwhile, as it gives the group common purpose and places college students in a position to mentor these young women. This paper addresses learning experiences in different areas of bio-medical engineering offered to middle school girls in November 2008 via a day-long workshop entitled "Engineering The Body." The Kansas State University (KSU) Student Chapter of the IEEE Engineering in Medicine and Biology Society (EMBS) worked with the KSU Women in Engineering and Science Program (WESP) to design and sponsor these experiences, which addressed the areas of joint mechanics, electrocardiograms, membrane transport, computer mouse design, and audio filters for cochlear implants. Fifty five middle-school girls participated in this event, affirming the notion that biomedical engineering appeals to young women and that early education and recruitment efforts have the potential to expand the biomedical engineering talent pool.

  2. IEEE 802.11ac sebagai Standar Pertama untuk Gigabit Wireless LAN

    Directory of Open Access Journals (Sweden)

    Afdhal Afdhal

    2014-04-01

    Full Text Available WLAN is a technology that currently has been used widely. This technology is considered as a data transferring media technology within the LAN/MAN. To ensure that WLAN technology can be used widely in the whole world, the IEEE has set a standard known as 802.11 to be an international standard for the WLAN technology. This standard was appeared in 1997, and has been revised and improved for several times. This improvement is done to anticipate the rapidly grown WLAN market as well as to keep this technology remains effective, efficient, and reliable at any time. At the beginning of 2014, the IEEE has set 802.11ac-2013 as a new standard for WLANs that operate below 6 GHz to achieve a data rate for up to 7 Gbps. The purpose of this article is to describe comprehensively the IEEE 802.11ac standard as a result of recent changes to the regulatory for WLAN technology which is known as the first standard issued by the IEEE for the gigabit WLANs. This article discusses the goals and objectives to be achieved by 802.11ac standard as well as the parts that have been enhanced significantly both in its PHY and MAC layers. This article will also contrast the differences between the 802.11ac standard and previous WLAN standards. Finally it will also explain the level of compatibility and interoperability of 802.11ac standards with some of previous WLAN standard.Keywords: IEEE, 802.11, 802.11ac, Gigabit WLAN

  3. 1999 IEEE international conference on robotics and automation

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-07-01

    Topics covered in this conference include: biped robots; underwater vehicles; robot planning and programming for assembly; discrete event control of mobile robot maneuvering; navigation in unknown environment; biped robots; underwater vehicles; robot planning and programming for assembly; discrete event control of manufacturing systems; motion planning; robot control; actuator; teleoperation; force and position control; contact and grasping control; visual servo control; tactile sensing; mobile robots and applications; sensor-based navigation; underwater robotics; sensing, navigation and control; flexible manipulators; task scheduling; actuators and joint actuation; teleoperation; sensor-based teleoperation; contact geometry; sonar-based sensing; mobile robot-environment interaction; mobile robot motion planning; biology-inspired methods; service and underwater robots; manufacturing planning and scheduling; constraint and nonholonomic system; fault-tolerant robots; parallel manipulators; dexterous manipulation; computer vision in manufacturing; contact sensing; mobile robot field applications; flexible robots; fuzzy control; and more.

  4. DNA Commission of the International Society for Forensic Genetics: Recommendations on the validation of software programs performing biostatistical calculations for forensic genetics applications.

    Science.gov (United States)

    Coble, M D; Buckleton, J; Butler, J M; Egeland, T; Fimmers, R; Gill, P; Gusmão, L; Guttman, B; Krawczak, M; Morling, N; Parson, W; Pinto, N; Schneider, P M; Sherry, S T; Willuweit, S; Prinz, M

    2016-11-01

    The use of biostatistical software programs to assist in data interpretation and calculate likelihood ratios is essential to forensic geneticists and part of the daily case work flow for both kinship and DNA identification laboratories. Previous recommendations issued by the DNA Commission of the International Society for Forensic Genetics (ISFG) covered the application of bio-statistical evaluations for STR typing results in identification and kinship cases, and this is now being expanded to provide best practices regarding validation and verification of the software required for these calculations. With larger multiplexes, more complex mixtures, and increasing requests for extended family testing, laboratories are relying more than ever on specific software solutions and sufficient validation, training and extensive documentation are of upmost importance. Here, we present recommendations for the minimum requirements to validate bio-statistical software to be used in forensic genetics. We distinguish between developmental validation and the responsibilities of the software developer or provider, and the internal validation studies to be performed by the end user. Recommendations for the software provider address, for example, the documentation of the underlying models used by the software, validation data expectations, version control, implementation and training support, as well as continuity and user notifications. For the internal validations the recommendations include: creating a validation plan, requirements for the range of samples to be tested, Standard Operating Procedure development, and internal laboratory training and education. To ensure that all laboratories have access to a wide range of samples for validation and training purposes the ISFG DNA commission encourages collaborative studies and public repositories of STR typing results. Published by Elsevier Ireland Ltd.

  5. IEEE1588协议在工业以太网中的实现%Implementation of IEEE 1588 Protocol over Industrial Ethernet

    Institute of Scientific and Technical Information of China (English)

    关松青; 肖昌炎; 夏晓荣

    2011-01-01

    An IEEE 1588 server, which is based on the foreground/background system with the priorities of interrupts, is designed and implemented to meet the high precision requirement of time synchronization in distributed power systems by using an ARM(@)CortexTM-M3 based microcontroller, which supports IEEE 1588 protocol. The burden of microcontroller is reduced and the real-time performance is further improved as a result of adopting the lightweight TCP/IP stack and simplifying the protocol's complexity to program the bottom communication software. It is shown in test experiments that this server characterizes high clock-synchronizatiun accuracy, excellent stability and low cost, and it has a bright prosperity to be applied into practice.%为满足电力等分布式测控系统对时钟同步的高精度要求,采用TI公司支持IEEE 1588协议的Cortex-M3核ARM芯片作为微处理器,设计并实现一种基于中断优先级的前/后台框架的精密时钟网络服务器.由于选用轻量级TCP/IP协议栈(LwIP)和简化同步协议设计底层通信软件,能减轻处理器负担,实时性能得到改善.测试实验结果表明,该设备同步精度高、稳定性好、成本低,具有较好的应用前景.

  6. Finnish Society of Soil Sciences

    Science.gov (United States)

    Rankinen, Katri; Hänninen, Pekka; Soinne, Helena; Leppälammi-Kujansuu, Jaana; Salo, Tapio; Pennanen, Taina

    2017-04-01

    In 1998 the organization of the International Union of Soil Sciences (IUSS) was renewed to better support national activities. That was also the new start in the operation of the Finnish Society of Soil Sciences, which became affiliated to the IUSS. The society was originally established in 1971 but it remained relatively inactive. Currently, there are around 200 members in the Finnish Society of Soil Sciences. The members of the executive board cover different fields of soil science from geology to microbiology. Mission statement of the society is to promote the soil sciences and their application in Finland, to act as a forum for creation of better links between soil scientists, interested end users and the public, and to promote distribution and appreciation of general and Finnish research findings in soil science. Every second year the society organizes a national two-day long conference. In 2017 the theme 'circular economy' collected all together 57 presentations. The members of the incoming student division carried responsibility in practical co-ordination committee, acting also as session chairs. In the intervening years the society organizes a weekend excursion to neighboring areas. Lately we have explored the use of biochar in landscaping of Stockholm.

  7. 9th IEEE International Symposium on Intelligent Systems and Informatics

    CERN Document Server

    2013-01-01

    The theory and applications of  intelligent systems is today an important field of research. This  book is an up-to-date collection of seventeen chapters, written by recognized experts in the field. In an introductory mathematical foundations part an overview of generalizations of the integral inequalities for nonadditive integrals  and a construction of the General Prioritized Fuzzy Satisfaction Problem is given. Then different aspects of robotics are presented, such as the differences between human beings and robots, the  motion of bipedal humanoid robots, and an evaluation of  different autonomous quadrotor flight controllers. Also Fuzzy Systems are presented by a model of basic planar imprecise geometric objects  allowing  various applications in image analysis , GIS, and robotics, as well as a  type-2 fuzzy logic in  a software library for developing perceptual computers, and a two--degree--of--freedom  speed control solutions for a brushless Direct Current motor.  The book also presents recen...

  8. Society for Vascular Medicine

    Science.gov (United States)

    ... Certification with this new online course from the Society for Vascular Medicine. Learn more. Looking for a ... jobs are listed right now. Copyright © 2016 The Society for Vascular Medicine. All Rights Reserved.

  9. American Society of Nephrology

    Science.gov (United States)

    ... stay safe! – @ASNKidney on Twitter ASN News Feed Society Events Interact With ASN rss Facebook Twitter YouTube ... Podcast ASN Communities Share ASN User Login © American Society of Nephrology top Text Size + - Translate Sitemap Terms ...

  10. Society for Ambulatory Anesthesia

    Science.gov (United States)

    ... We Represent Ambulatory and Office-Based Anesthesia The Society for Ambulatory Anesthesia provides educational opportunities, encourages research ... 6620 | E-mail: info@sambahq.org Copyright | 2016 Society for Ambulatory Anesthesia Home | Search | Terms | Privacy Policy | ...

  11. Ehlers-Danlos Society

    Science.gov (United States)

    ... Scientific Board Staff Volunteer Leaders The Ehlers-Danlos Society Center for EDS Research & Clinical Care Our History ... Message Boards Patient Resource Library The Ehlers-Danlos Society Center for EDS Research & Clinical Care Loose Connections ...

  12. American Society of Echocardiography

    Science.gov (United States)

    American Society of Echocardiography Join Ase Member Portal Log In Membership Member Portal Log In Join ASE Renew Benefits Rates FASE – Fellow of the American Society of Echocardiography Member Referral Program FAQs Initiatives Advocacy ...

  13. International Transplant Nurses Society

    Science.gov (United States)

    ... The Mission of ITNS The International Transplant Nurses Society is committed to the promotion of excellence in ... 20-1589538 Copyright © 2006 - 2014 International Transplant Nurses Society (ITNS). No materials, including graphics, may be reused, ...

  14. American Urogynecologic Society

    Science.gov (United States)

    ... Patient Site » PFD Registry » Contact Us American Urogynecologic Society 1100 Wayne Avenue, Suite 670 Silver Spring, MD ... Us | Privacy Policy | HONcode Accredited © 2016 American Urogynecologic Society. All rights reserved.

  15. Scoliosis Research Society

    Science.gov (United States)

    Scoliosis Research Society Close Menu Member Login Become a Member Home Find a Specialist | Calendar Contact | Donate ... a Member Find a Specialist Calendar Contact Donate Scoliosis Research Society Dedicated to the optimal care of ...

  16. PREFACE: Proceedings of the 11th European Workshop of the European Microbeam Analysis Society (EMAS) on Modern Developments and Applications in Microbeam Analysis

    Science.gov (United States)

    2010-07-01

    This volume of IOP Conference Series: Materials Science and Engineering contains papers from the 11th Workshop of the European Microbeam Analysis Society (EMAS) on Modern Developments and Applications in Microbeam Analysis which took place from 10-14 May 2009 in the Hotel Faltom, Gdynia, Poland. The primary aim of this series of workshops is to assess the state-of-the-art and reliability of microbeam analysis techniques. The workshops also provide a forum where students and young scientists starting out on careers in microbeam analysis can meet and discuss with the established experts. The workshops have a very distinct format comprising invited plenary lectures by internationally recognized experts, poster presentations by the participants and round table discussions on the key topics led by specialists in the field. For this workshop EMAS invited speakers on the following topics: EPMA, EBSD, fast energy-dispersive X-ray spectroscopy, three-dimensional microanalysis, and micro-and nanoanalysis in the natural resources industry. The continuing relevance of the EMAS workshops and the high regard in which they are held internationally can be seen from the fact that 69 posters from 16 countries were on display at the meeting and that the participants came from as far away as Japan and the USA. A number of participants with posters were invited to give short oral presentations of their work in two dedicated sessions. As at previous workshops there was also a special oral session for young scientists. Small cash prizes were awarded for the three best posters and for the best oral presentation by a young scientist. The prize for the best poster went to the contribution by G Tylko, S Dubchak, Z Banach and K Turnau, entitled Monte Carlo simulation for an assessment of standard validity and quantitative X-ray microanalysis in plant. Joanna Wojewoda-Budka of the Institute of Metallurgy and Materials Science, Krakow, received the prize for the best oral presentation by a

  17. Reclaiming Society Publishing

    Directory of Open Access Journals (Sweden)

    Philip E. Steinberg

    2015-07-01

    Full Text Available Learned societies have become aligned with commercial publishers, who have increasingly taken over the latter’s function as independent providers of scholarly information. Using the example of geographical societies, the advantages and disadvantages of this trend are examined. It is argued that in an era of digital publication, learned societies can offer leadership with a new model of open access that can guarantee high quality scholarly material whose publication costs are supported by society membership dues.

  18. Design of High Precision Network Clock Synchronization Software Based on IEEE1588 Protocol%基于IEEE1588协议的高精度网络时钟同步软件设计

    Institute of Scientific and Technical Information of China (English)

    吕青松; 吴宁

    2013-01-01

    Based on the analysis of principle IEEE 1588 protocol and the factors affecting the synchronization accuracy,a time synchronization approach on Windows platform is proposed in this paper,and the approach provides a feasible and effective solution for distributed network system clock accuracy synchronization. At present,the timestamp accuracy is at about 10 ms level obtained directly from the application layer on windows platform,while the system synchronization is at millisecond level. For the difficulties to obtain higher precision 1588 timestamp on windows platform, a timestamp processing module based on SharpPcap is designed. The proposed approach reaches a higher accuracy in the data link layer timestamp,thus improves the timestamp precision of the application layer. The experimental results show that the synchronization accuracy of the system master-slave clock achieves sub-millisecond level in this approach, which can meet the requirements of clock synchronization accuracy within millisecond in the power system.%在分析IEEE 1588原理以及影响同步精度因素的基础上,设计了基于Windows平台的时间同步方法,为分布式网络系统的时钟精确同步提供了一种有效可行的解决办法。目前,Windows平台下直接在应用层获取的时间戳精度在10 ms级左右,系统的同步精度为ms级。针对Windows平台下获取更高精度1588时间戳的困难,设计了基于SharpPcap的时间戳处理模块,得到高精度的数据链路层时间戳,从而提高了应用层的时间戳精度。实验结果表明,采用该方法系统主从时钟的同步精度达到亚ms级,满足电力系统中同步精度在ms级以内的时钟同步需求。

  19. Polarization diverse antenna for dual-band WLAN applications

    CSIR Research Space (South Africa)

    Steyn, JM

    2009-10-01

    Full Text Available A dual-band dual-polarized (DBDP) configuration is proposed for wireless local area network (WLAN) applications. A four-element array is used to facilitate operation in both the standard WLAN frequency bands (IEEE 802.11b and IEEE 802.11a...

  20. Capacity Evaluation for IEEE 802.16e Mobile WiMAX

    Directory of Open Access Journals (Sweden)

    Chakchai So-In

    2010-01-01

    Full Text Available We present a simple analytical method for capacity evaluation of IEEE 802.16e Mobile WiMAX networks. Various overheads that impact the capacity are explained and methods to reduce these overheads are also presented. The advantage of a simple model is that the effect of each decision and sensitivity to various parameters can be seen easily. We illustrate the model by estimating the capacity for three sample applications—Mobile TV, VoIP, and data. The analysis process helps explain various features of IEEE 802.16e Mobile WiMAX. It is shown that proper use of overhead reducing mechanisms and proper scheduling can make an order of magnitude difference in performance. This capacity evaluation method can also be used for validation of simulation models.

  1. RSAD: A Robust Distributed Contention-Based Adaptive Mechanism for IEEE 802.11 Wireless LANs

    Institute of Scientific and Technical Information of China (English)

    Yong Peng; Shi-Duan Cheng; Jun-Liang Chen

    2005-01-01

    Previous researches have shown that Distributed Coordination Function (DCF) access mode of IEEE 802.11 has lower performance in heavy contention environment. Based on the in-depth analysis of IEEE 802.11 DCF, NSAD (New Self-adapt DCF-based protocol) has been proposed to improve system saturation throughput in heavy contention condition.The initial contention window tuning algorithm of NSAD is proved effective in error-free environment. However, problems concerning the exchanging of initial contention window occur in error-prone environment. Based on the analysis of NSAD's performance in error-prone environment, RSAD is proposed to further enhance the performance. Simulation in a more real shadowing error-prone environment is done to compare the performance of NSAD and RSAD and results have shown that RSAD can achieve further performance improvement as expected in the error-prone environment than NSAD (i.e., better goodput and fairness index).

  2. Performance evaluation on IEEE 802.11e considering emergency calls in congested situation

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    To enhance the quality of service (QoS) support in IEE 802.11, IEEE 802.11e has been studied, which introduces the so-called hybrid coordination function (HCF). HCF includes two medium access mechanisms: contention-based channel access (EDCA), and contention-free channel access (HCCA). Although IEEE 802.11e has provided differentiated channel access mechanism, when call demand rises for important festivals such as New Year's Day or large scale natural disasters such as earthquakes, the delay of voice will increase and the QoS of voice nodes will drop down rapidly. Through our simulation study, in order to guarantee the QoS of emergency voice calls in congested situation, a higher priority for these calls will be required.

  3. Performance Analysis of IEEE 802.16e Wimax Physical Layer

    Directory of Open Access Journals (Sweden)

    Dr. Vineeta Saxena Nigam *,

    2014-05-01

    Full Text Available WiMAX (worldwide inter-operability for microwave access is an emerging technology for global broadband wireless system offering high speed access to mobile and broadband services. It is based on IEEE 802.16e standard. This standard only deals with MAC and PHY layer specification of network architecture. Considerable research has been done on performance analysis of PHY layer model of WiMAX system over AWGN channel model. This paper attempts performance analysis of IEEE 802.16e PHY layer model over AWGN as well as SUI channel models as SUI channel models are more realistic models based on empirical results. Different modulation schemes, coding rates, and different values of cyclic prefix are considered for comparison using BER (Bit error rate ratio and SNR (Signal to Noise ratio as performance parameters.

  4. Integration of IEEE 1451 and HL7 Exchanging Information for Patients’ Sensor Data

    Science.gov (United States)

    Lim, Suyoung; Ahn, Jinsoo; Nah, Jiyoung; Kim, Namhyun

    2009-01-01

    HL7 (Health Level 7) is a standard developed for exchanging incompatible healthcare information generated from programs or devices among heterogenous medical information systems. At present, HL7 is growing as a global standard. However, the HL7 standard does not support effective methods for treating data from various medical sensors, especially from mobile sensors. As ubiquitous systems are growing, HL7 must communicate with various medical transducers. In the area of sensor fields, IEEE 1451 is a group of standards for controlling transducers and for communicating data from/to various transducers. In this paper, we present the possibility of interoperability between the two standards, i.e., HL7 and IEEE 1451. After we present a method to integrate them and show the preliminary results of this approach. PMID:20703604

  5. Performance Analytical Model of IEEE 802.11 Distributed Coordination Function

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    IEEE 802.11 distributed coordination function (DCF) is a distributed medium access scheme based on carrier sense multiple access with collision avoidance (CSMA/CA) protocol. Many literatures have analyzed the performance of IEEE 802.11 DCF. However, such literatures either used simulation methods or built the analytical models under the assumption that the saturation condition was satisfied. To overcome such a problem, in this paper, a bi-dimensional Markovian model has been introduced to depict the DCF mechanism. The proposed model introduced an idle stage and a discrete time M/G/1 queue to deduce the channel throughput under finite load traffic. Simulation results proved the accuracy of the proposed model.

  6. The Research of ST-OFDM in Physical Layer of IEEE 802.16a

    Institute of Scientific and Technical Information of China (English)

    JU Mei-yan; ZHU Qi; FENG Guang-zeng

    2004-01-01

    This paper briefly introduces one of the three physical layer implementations of IEEE 802.16a[1], Wireless MAN-OFDM PHY. Based on the implementation, the combination of Orthogonal Frequency Division Multiplexing (OFDM) and Space-Time Coding ( STC ) which is briefly called ST-OFDM in IEEE 802.16a, is investigated under the channel provided in Ref . [ 2 ]. Especially, this paper is focused on the influence of the optimal decision threshold on the system Bit-Error-Rate ( BER ) performance based on unequal probabilities of sources. The simulations show that when SignalNoise-Ratio ( SNR ) is low the optimal decision threshold is obviously superior to the usual one; when SNR is high to some extent, such as 10 dB for 4QAM and 16 dB for 16QAM, we can use the usual decision threshold instead of the optimal one .

  7. Pilot Based Channel Estimation in IEEE 802.16a OFDM System

    Institute of Scientific and Technical Information of China (English)

    ZHU Qi; LU Hao

    2005-01-01

    Orthogonal Frequency Division Multiplexing(OFDM)is a kind of transmission techniques with high frequency efficiency,which will be widely used in next-generation wireless communication systems.In this paper,pilot-based channel estimation for IEEE 802.16a OFDM system is studied.By comparing the performance of LS(least squares)estimator and Linear Minimum Mean-Square Error(LMMSE)estimator using Preamble 1 and Preamble 2 suggested by IEEE 802.16a standard in slow fading channel,we propose that Preamble 1 can be used in small multipath delay spread channel and Preamble 2 can be used in large multipath delay spread channel.Considering the tradeoff between performance and complexity,the LS estimator is suggested.

  8. A Priority and SDB based Admission Control in IEEE 802.16 Systems

    Directory of Open Access Journals (Sweden)

    Xiu-ying Sun

    2010-09-01

    Full Text Available In IEEE 802.16 systems, the algorithm of admission control (AC is very important in guaranteeing the Quality of Service (QoS and managing service flows. However, the IEEE 802.16 standards do not specify any related strategies or algorithms on AC. In order to improve the system performance and satisfy the QoS of stations to the max, we propose a new AC strategy, which includes a weighted blocking rate based priority strategy and a satisfaction-degree based bandwidth-borrowing strategy named SDB in this paper. The simulation results show that the proposed strategy improves the overall performance of system in terms of weighted blocking rate. Furthermore, our strategy enhances the QoS in comparison with the strategy adopting conventional bandwidth-borrowing algorithm.

  9. Securing IEEE 802.11g WLAN Using Open VPN and its Impact Analysis

    Directory of Open Access Journals (Sweden)

    Praveen Likhar

    2011-12-01

    Full Text Available Like most advances, wireless LAN poses both opportunities and risks. The evolution of wireless networking in recent years has raised many serious security issues. These security issues are of greatconcern for this technology as it is being subjected to numerous attacks. Because of the free-space radio transmission in wireless networks, eavesdropping becomes easy and consequently a security breach may result in unauthorized access, information theft, interference and service degradation. Virtual Private Networks (VPNs have emerged as an important solution to security threats surrounding the use of public networks for private communications. While VPNs for wired line networks have matured in both research and commercial environments, the design and deployment of VPNs for WLAN is still an evolving field. This paper presents an approach to secure IEEE 802.11g WLAN using OpenVPN, a transport layer VPN solution and its impact on performance of IEEE 802.11g WLAN.

  10. Transient Stability Improvement of IEEE 9 Bus System Using Power World Simulator

    Directory of Open Access Journals (Sweden)

    Kaur Ramandeep

    2016-01-01

    Full Text Available The improvement of transient stability of power system was one of the most challenging research areas in power engineer.The main aim of this paper was transient stability analysis and improvement of IEEE 9 bus system. These studies were computed using POWER WORLD SIMULATOR. The IEEE 9 bus system was modelled in power world simulator and load flow studies were performed to determine pre-fault conditions in the system using Newton-Raphson method. The transient stability analysis was carried out using Runga method during three-phase balanced fault. For the improvement transient stability, the general methods adopted were fast acting exciters, FACT devices and addition of parallel transmission line. These techniques play an important role in improving the transient stability, increasing transmission capacity and damping low frequency oscillations.

  11. Securing IEEE 802.11G WLAN Using OpenVPN and Its Impact Analysis

    CERN Document Server

    Likhar, Praveen; M, Keshava Rao; 10.5121/ijnsa.2011.3607

    2012-01-01

    Like most advances, wireless LAN poses both opportunities and risks. The evolution of wireless networking in recent years has raised many serious security issues. These security issues are of great concern for this technology as it is being subjected to numerous attacks. Because of the free-space radio transmission in wireless networks, eavesdropping becomes easy and consequently a security breach may result in unauthorized access, information theft, interference and service degradation. Virtual Private Networks (VPNs) have emerged as an important solution to security threats surrounding the use of public networks for private communications. While VPNs for wired line networks have matured in both research and commercial environments, the design and deployment of VPNs for WLAN is still an evolving field. This paper presents an approach to secure IEEE 802.11g WLAN using OpenVPN, a transport layer VPN solution and its impact on performance of IEEE 802.11g WLAN.

  12. A Fast MAC-Layer Handover for an IEEE 802.16e-Based WMAN

    Science.gov (United States)

    Ray, Sayan K.; Pawlikowski, Krzysztof; Sirisena, Harsha

    We propose a modification of the IEEE 802.16e hard handover (HHO) procedure, which significantly reduces the handover latency constraint of the original HHO procedure in IEEE 802.16e networks. It allows a better handling of the delay-sensitive traffic by avoiding unnecessary time-consuming scanning and synchronization activity as well as simplifies the network re-entry procedure. With the help of the backhaul network, it reduces the number of control messages in the original handover policy, making the handover latency acceptable also for real-time streaming traffic. Preliminary performance evaluation studies show that the modified handover procedure is able to reduce the total handover latency by about 50%.

  13. Uplink Scheduling for Supporting Real Time Voice Traffic in IEEE 802.16 Backhaul Networks

    Institute of Scientific and Technical Information of China (English)

    Lizhong Dai; Dongmei Zhao

    2008-01-01

    In this paper we propose simple enhancements to the bandwidth (BW) request messages in IEEE 802.16 for supporting real-time packet voice traffic. Three different BW request formats are proposed, each requiring a different amount of latency information about the buffered packets at the SS. On this basis, packet scheduling schemes are proposed for the BS to make resource allocations for real-time traffic. Our results show that the proposed BW request and scheduling schemes achieve significantly lower packet loss probability than the standard IEEE 802.16 BW request with round robin scheduling.The results further show that there is an optimum point about how much delay information the SS should report to the BS in order to best utilize the uplink resources while the SS provides satisfactory real-time performance for the voice traffic.

  14. A Survey of Mobile WiMAX IEEE 802.16m Standard

    CERN Document Server

    Rakesh, Jha; Dalal, Upena

    2010-01-01

    IEEE 802.16m amends the IEEE 802.16 Wireless MAN-OFDMA specification to provide an advanced air interface for operation in licenced bands. It will meet the cellular layer requirements of IMT-Advanced next generation mobile networks. It will be designed to provide significantly improved performance compared to other high rate broadband cellular network systems. For the next generation mobile networks, it is important to consider increasing peak, sustained data reates, corresponding spectral efficiencies, system capacity and cell coverage as well as decreasing latency and providing QoS while carefully considering overall system complexity. In this paper we provide an overview of the state-of-the-art mobile WiMAX technology and its development. We focus our discussion on Physical Layer, MAC Layer, Schedular,QoS provisioning and mobile WiMAX specification.

  15. Hybrid Polling Method for Direct Link Communication for IEEE 802.11 Wireless LANs

    Directory of Open Access Journals (Sweden)

    Woo-Yong Choi

    2008-10-01

    Full Text Available The direct link communication between STAtions (STAs is one of the techniques to improve the MAC performance of IEEE 802.11 infrastructure networks. For the efficient direct link communication, in the literature, the simultaneous polling method was proposed to allow the multiple direct data communication to be performed simultaneously. However, the efficiency of the simultaneous polling method is affected by the interference condition. To alleviate the problem of the lower polling efficiency with the larger interference range, the hybrid polling method is proposed for the direct link communication between STAs in IEEE 802.11 infrastructure networks. By the proposed polling method, we can integrate the sequential and simultaneous polling methods properly according to the interference condition. Numerical examples are also presented to show the medium access control (MAC performance improvement by the proposed polling method.

  16. A note on bound constraints handling for the IEEE CEC'05 benchmark function suite.

    Science.gov (United States)

    Liao, Tianjun; Molina, Daniel; de Oca, Marco A Montes; Stützle, Thomas

    2014-01-01

    The benchmark functions and some of the algorithms proposed for the special session on real parameter optimization of the 2005 IEEE Congress on Evolutionary Computation (CEC'05) have played and still play an important role in the assessment of the state of the art in continuous optimization. In this article, we show that if bound constraints are not enforced for the final reported solutions, state-of-the-art algorithms produce infeasible best candidate solutions for the majority of functions of the IEEE CEC'05 benchmark function suite. This occurs even though the optima of the CEC'05 functions are within the specified bounds. This phenomenon has important implications on algorithm comparisons, and therefore on algorithm designs. This article's goal is to draw the attention of the community to the fact that some authors might have drawn wrong conclusions from experiments using the CEC'05 problems.

  17. 2011 IEEE Visualization Contest Winner: Visualizing Unsteady Vortical Behavior of a Centrifugal Pump

    KAUST Repository

    Otto, Mathias

    2012-09-01

    In the 2011 IEEE Visualization Contest, the dataset represented a high-resolution simulation of a centrifugal pump operating below optimal speed. The goal was to find suitable visualization techniques to identify regions of rotating stall that impede the pump\\'s effectiveness. The winning entry split analysis of the pump into three parts based on the pump\\'s functional behavior. It then applied local and integration-based methods to communicate the unsteady flow behavior in different regions of the dataset. This research formed the basis for a comparison of common vortex extractors and more recent methods. In particular, integration-based methods (separation measures, accumulated scalar fields, particle path lines, and advection textures) are well suited to capture the complex time-dependent flow behavior. This video (http://youtu.be/ oD7QuabY0oU) shows simulations of unsteady flow in a centrifugal pump. © 2012 IEEE.

  18. Performance analysis of IEEE 802.11n network under unsaturated conditions

    Science.gov (United States)

    Lang, Gaiping; Ma, Lin; Xu, Yubin

    2017-07-01

    Frame aggregation is the most important medium access control (MAC) enhancement of IEEE 802.11n. In frame aggregation, multiple frames are encapsulated into a single frame. In the analysis of 802.11n performance, the existing researches assumed that each station always had a packet for transmission. But actually, sometimes stations may have no packet to transmit. In this paper, we develop an analytical model for IEEE 802.11n in unsaturated conditions. Therefore, the transmission of the station is assumed to be a bulk service queue system. Bulk size is aggregation size. According to the 802.11n standard, when the number of packets in the buffer is smaller than the aggregation size, we can also transmit all the packets in the buffer using A-MPDU. Therefore, bulk size is variable. The throughput and mean access delay are achieved. Numerical results show that the proposed algorithm can effectively increase the throughput and lower the access delay.

  19. Integration of IEEE 1451 and HL7 exchanging information for patients' sensor data.

    Science.gov (United States)

    Kim, Wooshik; Lim, Suyoung; Ahn, Jinsoo; Nah, Jiyoung; Kim, Namhyun

    2010-12-01

    HL7 (Health Level 7) is a standard developed for exchanging incompatible healthcare information generated from programs or devices among heterogenous medical information systems. At present, HL7 is growing as a global standard. However, the HL7 standard does not support effective methods for treating data from various medical sensors, especially from mobile sensors. As ubiquitous systems are growing, HL7 must communicate with various medical transducers. In the area of sensor fields, IEEE 1451 is a group of standards for controlling transducers and for communicating data from/to various transducers. In this paper, we present the possibility of interoperability between the two standards, i.e., HL7 and IEEE 1451. After we present a method to integrate them and show the preliminary results of this approach.

  20. AN IMPROVED CHANNEL DETECTION METHOD FOR IEEE 802.11N MIMO SYSTEM

    Institute of Scientific and Technical Information of China (English)

    Yao Xiaocheng; Jian Haifang; Fang Zhi; Shi Yin

    2011-01-01

    Coexistence and interoperability between 20 MHz and 40 MHz device and modes of operations are stressed in standard IEEE 802.11n system.It is mandate to report the both sub-channels states to Medium Access Control (MAC) at receiver,since for 40 MHz device,it should serve not only 20 MHz but also 40 MHz signals receiving.Both energy detection and carrier sense are employed to detect channel state.In the case of 20/40 M mode,the power difference between the two sub-channels is also detected in order to report the channel state accurately.The simulation results demonstrate that the performance of the proposed methods are much better than the methods which just employ energy detection.Besides,the simulation results show that the proposed methods ensure that the channel sensing is not a roadblock of IEEE 802.11n system design.

  1. The Exploration of Network Coding in IEEE 802.15.4 Networks

    Directory of Open Access Journals (Sweden)

    Deze Zeng

    2011-01-01

    communication protocol should be energy efficient. The IEEE 802.15.4 is designed as a standard protocol for low power, low data rate, low complexity, and short range connections in WPANs. The standard supports allocating several numbers of collision-free guarantee time slots (GTSs within a superframe for some time-critical transmissions. Recently, COPE was proposed as a promising network coding architecture to essentially improve the throughput of wireless networks. In this paper, we exploit the network coding technique at coordinators to improve energy efficiency of the WPAN. Some related practical issues, such as GTS allocation and multicast, are also discussed in order to exploit the network coding opportunities efficiently. Since the coding opportunities are mostly exploited, our proposal achieves both higher energy efficiency and throughput performance than the original IEEE 802.15.4.

  2. An NTP Stratum-One Server Farm Fed By IEEE-1588

    Science.gov (United States)

    2010-01-01

    synchronized to its Master Clocks via IRIG -B time code on a low- frequency RF distribution system. The availability of Precise Time Protocol (PTP, IEEE...forwarding back to the requestor. The farm NTP servers are synchronized to the USNO Master Clocks using IRIG -B time code. The current standard NTP... IRIG -B and provide memory-mappable BCD time clocks. The standard NTP distribution is augmented with a USNO- developed NTP reference clock driver for

  3. Performance Evaluation of IEEE 802.15.4 under Jamming DoS Attack

    OpenAIRE

    2013-01-01

    Wireless Sensor Network (WSN) is a wireless network consisting of small nodes with sensing, computation, and wireless communications capabilities. The design of wireless sensor networks depends of many factors, such as transmission errors, network topology and power consumption. Many routing protocols, protocols for data transmission, are specifically designed for wireless sensor networks where energy consumption is essential. This paper provides a brief description of the IEEE 802.15.4/ZigBe...

  4. Interpretation of IEEE-854 floating-point standard and definition in the HOL system

    Science.gov (United States)

    Carreno, Victor A.

    1995-01-01

    The ANSI/IEEE Standard 854-1987 for floating-point arithmetic is interpreted by converting the lexical descriptions in the standard into mathematical conditional descriptions organized in tables. The standard is represented in higher-order logic within the framework of the HOL (Higher Order Logic) system. The paper is divided in two parts with the first part the interpretation and the second part the description in HOL.

  5. Study of asymmetric traffic influence on IEEE 802.11 WLAN family, enhancement proposals

    OpenAIRE

    López Aguilera, M. Elena; Casademont Serra, Jordi; Cotrina Navau, Josep

    2004-01-01

    This paper is focused on the study of WLAN performance in IEEE 802.11 networks that are in a situation of asymmetric traffic, where the access point (AP) transmits much more than the user stations (US). This situation is very different from the symmetric one, wherein all the stations have the same traffic load. The paper also presents a discussion of the different mechanisms in order to increase AP priority under the asymmetric traffic situation. Peer Reviewed

  6. [Mobile Health: IEEE Standard for Wearable Cuffless Blood Pressure Measuring Devices].

    Science.gov (United States)

    Zhou, Xia; Wu, Wenli; Bao, Shudi

    2015-07-01

    IEEE Std 1708-2014 breaks through the traditional standards of cuff based blood pressure measuring devices and establishes a normative definition of wearable cuffless blood pressure measuring devices and the objective performance evaluation of this kind of devices. This study firstly introduces the background of the new standard. Then, the standard details will be described, and the impact of cuffless blood pressure measuring devices with the new standard on manufacturers and end users will be addressed.

  7. 基于IEEE802.16的OFDM同步问题分析

    Institute of Scientific and Technical Information of China (English)

    赵莹琦

    2011-01-01

    在OFDM(正交频分复用)系统中,收发双方的同步是决定通信系统性能的重要指标.该文阐述了IEEE802.16中的OFDM同步问题,并对存在的偏差进行分析.对学习OFDM起到了一定的指导作用.

  8. Practical support for Lean Six Sigma software process definition using IEEE software engineering standards

    CERN Document Server

    Land, Susan K; Walz, John W

    2012-01-01

    Practical Support for Lean Six Sigma Software Process Definition: Using IEEE Software Engineering Standards addresses the task of meeting the specific documentation requirements in support of Lean Six Sigma. This book provides a set of templates supporting the documentation required for basic software project control and management and covers the integration of these templates for their entire product development life cycle. Find detailed documentation guidance in the form of organizational policy descriptions, integrated set of deployable document templates, artifacts required in suppo

  9. BER Performance of IEEE 802.11ad for Single Carrier and Multi Carrier

    Directory of Open Access Journals (Sweden)

    Abhishek Kumar Gupta

    2012-05-01

    Full Text Available In present scenario 802.11n is one of the fastest standards which is widely popular. It provides a theoretical maximum of 450 megabits per second (Mbps, with a typical throughput of 100Mbps. As we know, there is high demand for higher speed due to an increasing of high definition (HD video on smart phone usage and home entertainment. As 802.11n is not able to provide the required speed needed for these uses, thus there is need for technologies which can meet therequirement. IEEE 802.11ad is one of such standards which meet the requirement needed for the above. IEEE 802.11ad standard operates at 60 GHz frequency, promise to deliver from 1 to 7 Gbps. 60 GHz band is one of the largest unlicensed bandwidth with availability of at least 5 GHz of continuous bandwidth worldwide. In this paper we have tested the IEEE 802.11ad system model Bits Error Rate (BER for different modulation technique under several coding scheme for both Single Carrier and Multi Carriers. In this model the modulation technique mainly used are Binary Phase Shift Keying (BPSK, Quaternary Phase Shift Keying (QPSK, 16-Quadrature Amplitude Modulation (QAM, 64-Quadrature Amplitude Modulation (QAM and the coding scheme used is Low Density Parity Check (LDPC code with different code rate.

  10. An improved IEEE 802.11 protocol for reliable data transmission in power distribution fault diagnosis

    Energy Technology Data Exchange (ETDEWEB)

    Campoccia, F.; Di Silvestre, M.L.; Sanseverino, E.R.; Zizzo, G. [Palermo Univ., Palermo (Italy)

    2010-10-15

    In power systems, on-line transmission between local units and the central unit can be done by means of power line communications or wireless technology. During an electrical fault, the reliability of the distribution system depends on the security of the timely protective and restorative actions on the network. This paper focused on the WiFi system because of its economy and ease of installation. However, WiFi systems are typically managed by the IEEE 802.11 protocol, which is not reliable in terms of security in data communication. In WiFi networks, data is divided into packets and sent in succession to reduce errors within the radio channel. The IEEE 802.11 protocol has high probability for loss of packets or delay in their transmission. In order to ensure the reliability of data transmission times between two terminal units connected by WiFi stations, a new protocol was derived by modifying the IEEE 802.11. The improvements of the new protocol were highlighted and its capability for the diagnostic service was verified. The modified protocol eliminates the danger of collisions between packets and optimizes the transmission time for sending information. 6 refs., 7 tabs., 8 figs.

  11. Fairness resource allocation and scheduling for IEEE 802.16 Mesh networks

    Directory of Open Access Journals (Sweden)

    Limin Peng

    2010-06-01

    Full Text Available The IEEE 802.16 standard provides a scheme for creating multi-hop relay networks, which can be deployed as a high speed wide area wireless network at low cost. Although the standard defines signaling mechanisms in mesh mode, however, it doesn’t specify wireless resource management in the protocol. In this paper, we address the problem of resource allocation with the goal of providing fairness access to wireless channel for all the nodes as well as high network throughput in IEEE 802.16 mesh networks. We first define node’s unsatisfactory index and throughput function. Then, a multi-objective programming formulation is proposed for optimizing network performance. Accordingly, a dynamic programming based resource allocation and scheduling algorithm is presented to provide an optimal resource allocation to achieve fairness among different nodes as well as high network throughput in IEEE 802.16 mesh networks. Simulation results show that our proposed algorithm significantly provides both fairness of channel access and optimal network throughput.

  12. Survey of Down Link Data Allocation Algorithms in IEEE 802.16 WiMAX

    Directory of Open Access Journals (Sweden)

    Ahmed M Husein Shabani

    2012-08-01

    Full Text Available IEEE 802.16 standard and its marketing technology Worldwide Interoperability for Microwave Access (WiMAX is one of the leading technology that gain benefit of adopting orthogonal frequency division multiple access (OFDMA as its multiple access technique. OFDMA gives flexibility in resources allocation to accommodate a large number of users supporting several services classes with quality of service (QoS. This loads big challenges on its resource allocation. One of the key performance factors of OFDMA resource allocation is its downlink data packing mechanism. In IEEE802.16 standard based OFDMA the downlink data is packed into down link frames in the form of rectangular slots called burst.The standard leaves details of packing mechanism as an open issue for researchers and manufacturer to implement. Therefore recently several algorithms have been proposed in literature. This paper endeavours to identify key factors and tradeoffs issues associated with designing of downlink data packing algorithm for WiMAX based IEEE802.16 through a competitive survey of recent proposed algorithms.

  13. Segmentized Clear Channel Assessment for IEEE 802.15.4 Networks

    Directory of Open Access Journals (Sweden)

    Kyou Jung Son

    2016-06-01

    Full Text Available This paper proposed segmentized clear channel assessment (CCA which increases the performance of IEEE 802.15.4 networks by improving carrier sense multiple access with collision avoidance (CSMA/CA. Improving CSMA/CA is important because the low-power consumption feature and throughput performance of IEEE 802.15.4 are greatly affected by CSMA/CA behavior. To improve the performance of CSMA/CA, this paper focused on increasing the chance to transmit a packet by assessing precise channel status. The previous method used in CCA, which is employed by CSMA/CA, assesses the channel by measuring the energy level of the channel. However, this method shows limited channel assessing behavior, which comes from simple threshold dependent channel busy evaluation. The proposed method solves this limited channel decision problem by dividing CCA into two groups. Two groups of CCA compare their energy levels to get precise channel status. To evaluate the performance of the segmentized CCA method, a Markov chain model has been developed. The validation of analytic results is confirmed by comparing them with simulation results. Additionally, simulation results show the proposed method is improving a maximum 8.76% of throughput and decreasing a maximum 3.9% of the average number of CCAs per packet transmission than the IEEE 802.15.4 CCA method.

  14. Multi-model Music Content Description and Retrieval Using IEEE 1599 XML Standard

    Directory of Open Access Journals (Sweden)

    Alberto Pinto

    2009-02-01

    Full Text Available The new format IEEE 1599 for music and audio content description defines a standard for the representation of retrieval models within music and music/audio formats that makes use of XML documents as content descriptors. In this article, it is described how music/audio semantics can be actually represented within the Structural Layer of IEEE 1599, thanks to the introduction of novel Music Information Retrieval (MIR objects that can be exploited by music search engines. A complete description of MIR objects is provided and it is shown how they can be used to embed metadata relative to specific music retrieval models, thus allowing for the description of music content in different retrieval contexts. To this aim, a new concept for MIR Model is introduced together with its formalization and tools provided by category theory. The role of MIR objects and morphisms in music content description and retrieval is explained. Furthermore, a concrete example is given with the implementation of a graph-based model within the IEEE 1599 framework.

  15. Performance Evaluation of Beacon-Enabled Mode for IEEE 802.15.4 Wireless Sensor Network

    Directory of Open Access Journals (Sweden)

    M. Udin Harun Al Rasyid

    2013-12-01

    Full Text Available IEEE 802.15.5 standard support structure of star and peer-to-peer network formation. Strating from these, the cluster tree network can be built as a special case of peer-to-peer network to increse coverage area. In this paper, we provide an performance evaluation of beacon- enabled mode for IEEE 802.15.4 wireless sensor network on star and cluster topology in order to get the maximum result to apply the appropriate topology model as needed. We conduct analysis on each topology model by using the numbers of nodes from 10 nodes to 100 nodes to analyze throughput, delay, energy consumption, and probability success packet by using NS2 simulator. The simulation results show that the throughput and the probability of success packet of cluster topology are higher than that of star topology, and the energy consumption of cluster topology is lesser than that of star topology. However, cluster topology increases the delay more than star topology. Keywords: IEEE 802.15.4, wireless sensor network, beacon-enabled mode, topology, csma/ca

  16. Analysis and Enhancement of IEEE 802.15.4e DSME Beacon Scheduling Model

    Directory of Open Access Journals (Sweden)

    Kwang-il Hwang

    2014-01-01

    Full Text Available In order to construct a successful Internet of things (IoT, reliable network construction and maintenance in a sensor domain should be supported. However, IEEE 802.15.4, which is the most representative wireless standard for IoT, still has problems in constructing a large-scale sensor network, such as beacon collision. To overcome some problems in IEEE 802.15.4, the 15.4e task group proposed various different modes of operation. Particularly, the IEEE 802.15.4e deterministic and synchronous multichannel extension (DSME mode presents a novel scheduling model to solve beacon collision problems. However, the DSME model specified in the 15.4e draft does not present a concrete design model but a conceptual abstract model. Therefore, in this paper we introduce a DSME beacon scheduling model and present a concrete design model. Furthermore, validity and performance of DSME are evaluated through experiments. Based on experiment results, we analyze the problems and limitations of DSME, present solutions step by step, and finally propose an enhanced DSME beacon scheduling model. Through additional experiments, we prove the performance superiority of enhanced DSME.

  17. A versatile electrical penetration design qualified to IEEE Std. 317-1983

    Energy Technology Data Exchange (ETDEWEB)

    Lankenau, W.; Wetherill, T.M. [Imaging & Sensing Technology Corp., Horseheads, NY (United States)

    1994-12-31

    Although worldwide demand for new construction of nuclear power stations has been on a decline, the available opportunities for the design and construction of qualified electrical penetrations continues to offer challenges, requiring a highly versatile design. Versatility is necessary in order to meet unique customer requirements within the constraints of a design basis qualified to IEEE Std. 317-1983. This paper summarizes such a versatile electrical penetration designed, built and tested to IEEE Std. 317-1983. The principal features are described including major materials of construction. Some of the design constraints such as sealing requirements, and conductor density (including numerical example) are discussed. The requirements for qualification testing of the penetration assembly to IEEE Std. 317-1983 are delineated in a general sense, and some typical test ranges for preconditioning, radiation exposure, and LOCA are provided. The paper concludes by describing ways in which this versatile design has been adapted to meet unique customer requirements in a variety of nuclear power plants.

  18. Interoperability in digital electrocardiography: harmonization of ISO/IEEE x73-PHD and SCP-ECG.

    Science.gov (United States)

    Trigo, Jesús D; Chiarugi, Franco; Alesanco, Alvaro; Martínez-Espronceda, Miguel; Serrano, Luis; Chronaki, Catherine E; Escayola, Javier; Martínez, Ignacio; García, José

    2010-11-01

    The ISO/IEEE 11073 (x73) family of standards is a reference frame for medical device interoperability. A draft for an ECG device specialization (ISO/IEEE 11073-10406-d02) has already been presented to the Personal Health Device (PHD) Working Group, and the Standard Communications Protocol for Computer-Assisted ElectroCardioGraphy (SCP-ECG) Standard for short-term diagnostic ECGs (EN1064:2005+A1:2007) has recently been approved as part of the x73 family (ISO 11073-91064:2009). These factors suggest the coordinated use of these two standards in foreseeable telecardiology environments, and hence the need to harmonize them. Such harmonization is the subject of this paper. Thus, a mapping of the mandatory attributes defined in the second draft of the ISO/IEEE 11073-10406-d02 and the minimum SCP-ECG fields is presented, and various other capabilities of the SCP-ECG Standard (such as the messaging part) are also analyzed from an x73-PHD point of view. As a result, this paper addresses and analyzes the implications of some inconsistencies in the coordinated use of these two standards. Finally, a proof-of-concept implementation of the draft x73-PHD ECG device specialization is presented, along with the conversion from x73-PHD to SCP-ECG. This paper, therefore, provides recommendations for future implementations of telecardiology systems that are compliant with both x73-PHD and SCP-ECG.

  19. Segmentized Clear Channel Assessment for IEEE 802.15.4 Networks.

    Science.gov (United States)

    Son, Kyou Jung; Hong, Sung Hyeuck; Moon, Seong-Pil; Chang, Tae Gyu; Cho, Hanjin

    2016-06-03

    This paper proposed segmentized clear channel assessment (CCA) which increases the performance of IEEE 802.15.4 networks by improving carrier sense multiple access with collision avoidance (CSMA/CA). Improving CSMA/CA is important because the low-power consumption feature and throughput performance of IEEE 802.15.4 are greatly affected by CSMA/CA behavior. To improve the performance of CSMA/CA, this paper focused on increasing the chance to transmit a packet by assessing precise channel status. The previous method used in CCA, which is employed by CSMA/CA, assesses the channel by measuring the energy level of the channel. However, this method shows limited channel assessing behavior, which comes from simple threshold dependent channel busy evaluation. The proposed method solves this limited channel decision problem by dividing CCA into two groups. Two groups of CCA compare their energy levels to get precise channel status. To evaluate the performance of the segmentized CCA method, a Markov chain model has been developed. The validation of analytic results is confirmed by comparing them with simulation results. Additionally, simulation results show the proposed method is improving a maximum 8.76% of throughput and decreasing a maximum 3.9% of the average number of CCAs per packet transmission than the IEEE 802.15.4 CCA method.

  20. Study on additional carrier sensing for IEEE 802.15.4 wireless sensor networks.

    Science.gov (United States)

    Lee, Bih-Hwang; Lai, Ruei-Lung; Wu, Huai-Kuei; Wong, Chi-Ming

    2010-01-01

    Wireless sensor networks based on the IEEE 802.15.4 standard are able to achieve low-power transmissions in the guise of low-rate and short-distance wireless personal area networks (WPANs). The slotted carrier sense multiple access with collision avoidance (CSMA/CA) is used for contention mechanism. Sensor nodes perform a backoff process as soon as the clear channel assessment (CCA) detects a busy channel. In doing so they may neglect the implicit information of the failed CCA detection and further cause the redundant sensing. The blind backoff process in the slotted CSMA/CA will cause lower channel utilization. This paper proposes an additional carrier sensing (ACS) algorithm based on IEEE 802.15.4 to enhance the carrier sensing mechanism for the original slotted CSMA/CA. An analytical Markov chain model is developed to evaluate the performance of the ACS algorithm. Both analytical and simulation results show that the proposed algorithm performs better than IEEE 802.15.4, which in turn significantly improves throughput, average medium access control (MAC) delay and power consumption of CCA detection.

  1. Spectrum Hole Identification in IEEE 802.22 WRAN using Unsupervised Learning

    Directory of Open Access Journals (Sweden)

    V. Balaji

    2016-01-01

    Full Text Available In this paper we present a Cooperative Spectrum Sensing (CSS algorithm for Cognitive Radios (CR based on IEEE 802.22Wireless Regional Area Network (WRAN standard. The core objective is to improve cooperative sensing efficiency which specifies how fast a decision can be reached in each round of cooperation (iteration to sense an appropriate number of channels/bands (i.e. 86 channels of 7MHz bandwidth as per IEEE 802.22 within a time constraint (channel sensing time. To meet this objective, we have developed CSS algorithm using unsupervised K-means clustering classification approach. The received energy level of each Secondary User (SU is considered as the parameter for determining channel availability. The performance of proposed algorithm is quantified in terms of detection accuracy, training and classification delay time. Further, the detection accuracy of our proposed scheme meets the requirement of IEEE 802.22 WRAN with the target probability of falsealrm as 0.1. All the simulations are carried out using Matlab tool.

  2. Study on Additional Carrier Sensing for IEEE 802.15.4 Wireless Sensor Networks

    Directory of Open Access Journals (Sweden)

    Bih-Hwang Lee

    2010-06-01

    Full Text Available Wireless sensor networks based on the IEEE 802.15.4 standard are able to achieve low-power transmissions in the guise of low-rate and short-distance wireless personal area networks (WPANs. The slotted carrier sense multiple access with collision avoidance (CSMA/CA is used for contention mechanism. Sensor nodes perform a backoff process as soon as the clear channel assessment (CCA detects a busy channel. In doing so they may neglect the implicit information of the failed CCA detection and further cause the redundant sensing. The blind backoff process in the slotted CSMA/CA will cause lower channel utilization. This paper proposes an additional carrier sensing (ACS algorithm based on IEEE 802.15.4 to enhance the carrier sensing mechanism for the original slotted CSMA/CA. An analytical Markov chain model is developed to evaluate the performance of the ACS algorithm. Both analytical and simulation results show that the proposed algorithm performs better than IEEE 802.15.4, which in turn significantly improves throughput, average medium access control (MAC delay and power consumption of CCA detection.

  3. Application of Optimization Techniques to a Nonlinear Problem of Communication Network Design With Nonlinear Constraints

    Science.gov (United States)

    2002-06-01

    IEEE TRANSACTIONS ON AUTOMATIC CONTROL , VOL. 47, NO. 6, JUNE 2002 1033 Application of Optimization Techniques to a Nonlinear Problem of Communication... IEEE TRANSACTIONS ON AUTOMATIC CONTROL , VOL. 47, NO. 6, JUNE 2002 We consider J source-destination pairs, each of which is assigned a fixed multihop...blocking probabilities are at the maximum permitted value. IEEE TRANSACTIONS ON AUTOMATIC CONTROL , VOL. 47, NO. 6, JUNE

  4. Network performance study for mobile node in IEEE 802.15.4%移动节点在IEEE 802.15.4中网络性能的研究

    Institute of Scientific and Technical Information of China (English)

    张宇; 黄刘生

    2007-01-01

    研究并分析了IEEE 802.15.4协议在移动环境下的性能,仿真并分析了IEEE 802.15.4的Beacon和非Beacon两种不同的网络拓扑对移动节点的支持程度,针对存在的问题,提出了进一步改进的意见.

  5. 基于IEEE802.11n的无线局域网关键技术研究%Research on Key Technologies of Wireless Local Area Network IEEE802.11n

    Institute of Scientific and Technical Information of China (English)

    伍转华

    2012-01-01

      This paper first introduces several high speed physical layer specifications in the IEEE 802.11 series standards, and makes a brief analysis. Furthermore focuses on the research of the main standard IEEE802.11n from the two aspects of physical layer and media access control layer. It has elaborately analyzed the channel access method of IEEE802.11n and key technologies of physical layer and media access control layer in system throughput.%  文中首先介绍了IEEE 802.11系列标准中的几种高速物理层标准,并进行了简要的分析.接着分别从无线局域网PHY层和MAC层两个层面,重点研究了目前无线局域网领域的主流标准IEEE 802.11n.细致的分析了IEEE 802.11n的信道接入方式以及与系统吞吐量相关的MAC层和PHY层关键技术.

  6. Implementation of DoS attack and mitigation strategies in IEEE 802.11b/g WLAN

    Science.gov (United States)

    Deng, Julia; Meng, Ke; Xiao, Yang; Xu, Roger

    2010-04-01

    IEEE 802.11 wireless Local Area Network (WLAN) becomes very prevalent nowadays. Either as a simple range extender for a home wired Ethernet interface, or as a wireless deployment throughout an enterprise, WLAN provides mobility, convenience, and low cost. However, an IEEE 802.11b/g wireless network uses the frequency of unlicensed 2.4GHz, which makes the network unsafe and more vulnerable than traditional Ethernet networks. As a result, anyone who is familiar with wireless network may initiate a Denial of Service (DoS) attack to influence the common communication of the network or even make it crash. In this paper, we present our studies on the DoS attacks and mitigation strategies for IEEE 802.11b/g WLANs and describe some initial implementations using IEEE 802.11b/g wireless devices.

  7. IEEE 1394事务层接口的设计与实现%Design and implementation of IEEE 1394 transaction layer interface

    Institute of Scientific and Technical Information of China (English)

    王佩; 徐进; 张爱林

    2014-01-01

    本文设计的IEEE 1394事物层接口连接了PLB (Processor Local Bus )总线和1394链路层模块,主要实现1394事物层模块数据的发送和接收。首先对事物层接口进行系统结构设计,然后对PLB从接口、FIFO接口和主机访问寄存器接口这3个子模块分别进行逻辑设计,最后采用硬件描述语言对设计进行可综合描述,并使用软件 QuestaSim进行仿真验证。该设计使事务层能够跨时钟域同链路层进行数据包的传输,并进行有效的数据位宽转换,提高传输效率。经过仿真验证,结果满足设计要求,表明IEEE 1394事物层接口能够正常发送和接收等时及异步数据包。%T he design of the IEEE 1394 transaction layer interface connecting the PLB (Processor Local Bus) with the 1394 link layer module ,mainly aims to send and receive 1394 transaction layer module′s data .Firstly ,the system structure of transaction layer interface is designed ,and then the three sub -modules ,including PLB slave interface ,FIFO interface and host interface to access the registers are de‐signed .Finally the hardware description language is used to describe this design ,and the software QuestaSim is used to simulate and verify the result .This design of the transaction layer can transmit da‐ta packet with the link layer across the clock domain ,switch data width effectively and improve the transmission efficiency .The simulation results meet the design requirements and show that the transac‐tion layer can be capable of sending and receiving isochronous and asynchronous data correctly .

  8. Implementation of IEEE-1588 timing and synchronization for ATCA control and data acquisition systems

    Energy Technology Data Exchange (ETDEWEB)

    Correia, Miguel, E-mail: miguelfc@lei.fis.uc.pt [Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear-Laboratorio Associado, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Lisboa (Portugal); Sousa, Jorge; Combo, Alvaro; Rodrigues, Antonio P.; Carvalho, Bernardo B.; Batista, Antonio J.N.; Goncalves, Bruno [Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear-Laboratorio Associado, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Lisboa (Portugal); Correia, Carlos M.B.A. [Grupo de Electronica e Instrumentacao do Centro de Instrumentacao, Dept. de Fisica, Universidade de Coimbra, Coimbra (Portugal); Varandas, Carlos A.F. [Associacao EURATOM/IST, Instituto de Plasmas e Fusao Nuclear-Laboratorio Associado, Instituto Superior Tecnico, Universidade Tecnica de Lisboa, Lisboa (Portugal)

    2012-12-15

    Highlights: Black-Right-Pointing-Pointer IEEE-1588 over Ethernet protocol is implemented for the synchronization of all clock signals of an ATCA AMC carrier module. Black-Right-Pointing-Pointer The ATCA hardware consists of an AMC quad-carrier main-board with PCI Express switching. Black-Right-Pointing-Pointer IEEE-1588 is to be implemented on a Virtex-6 FPGA. Black-Right-Pointing-Pointer Timing signals on the ATX-AMC4-PTP are managed and routed by a crosspoint-switch implemented on a Virtex-6 FPGA. Black-Right-Pointing-Pointer Each clock signal source may be independently located (on each of the AMC cards, RTM or ATCA backplane). - Abstract: Control and data acquisition (C and DA) systems for Fusion experiments are required to provide accurate timing and synchronization (T and S) signals to all of its components. IPFN adopted PICMG's Advanced Telecommunications Computing Architecture (ATCA) industry standard to develop C and DA instrumentation. ATCA was chosen not only for its high throughput characteristics but also for its high availability (HA) features which become of greater importance in steady-state operation scenarios. However, the specified ATCA clock and synchronization interface may be too limited for the timing and synchronization needs in advanced Physics experiments. Upcoming specification extensions, developed by the 'xTCA for Physics' workgroups, will contemplate, among others, a complementary timing specification, developed by the PICMG xTCA for Physics IO, Timing and Synchronization Technical Committee. The IEEE-1588 Precision Time Protocol (PTP) over Ethernet is one of the protocols, proposed by the Committee, aiming for precise synchronization of clocks in measurement and control systems, based on low jitter and slave-to-slave skew criteria. The paper presents an implementation of IEEE-1588 over Ethernet, in an ATCA hardware platform. The ATCA hardware consists of an Advanced Mezzanine Card (AMC) quad-carrier front board with PCI

  9. Are Educational Governance Reforms in a Post-Conflict Society Conforming to Global Standards? Examining the Application of Education Convergence Theory in an Internationally Supervised and Politicized Context

    Science.gov (United States)

    Komatsu, Taro

    2016-01-01

    This article examines whether and to what extent educational reforms in a post-conflict society conform to "global (regional) standards," and explores the meaning of inconsistencies observed in the process of global reform transfer. Among the nations of the world, nowhere is the influence of external forces on educational reforms more…

  10. Civil Society and Governance

    DEFF Research Database (Denmark)

    Hulgård, Lars

    An illustration of how important the relationship is between civil society anbd governance. A short historic journey with four snapshots of times and situations that have provided interesting evidence about the connection between civil society and governance. My goal for the short historic journey...... is to make clear and hopefully even verify that providing knowledge about the impact of civil society and citizens’ participation on governance is one of the most urgent research tasks in the current period of time....

  11. Civil Society and Governance

    DEFF Research Database (Denmark)

    Hulgård, Lars

    An illustration of how important the relationship is between civil society anbd governance. A short historic journey with four snapshots of times and situations that have provided interesting evidence about the connection between civil society and governance. My goal for the short historic journey...... is to make clear and hopefully even verify that providing knowledge about the impact of civil society and citizens’ participation on governance is one of the most urgent research tasks in the current period of time....

  12. IEEE 802.16e标准中LDPC编码的实现与仿真%The implementation and simulation of IEEE 802.16e LDPC coding

    Institute of Scientific and Technical Information of China (English)

    宁平

    2014-01-01

    根据IEEE802.16e标准中LDPC编码的定义,提出了一种利用高速状态机来实现编码的快速算法.在Quartus Ⅱ下使用Verilog HDL实现了该算法并进行了时序仿真.仿真结果表明,设计具有良好的实时性,克服了以往设计中预处理复杂、消耗逻辑资源多的缺点.最后利用MATLAB对该设计与DVB-S2缩短码的BER性能进行了比较,分析了制约DVB-S2缩短码性能的因素.

  13. NASA/IEEE MSST 2004 Twelfth NASA Goddard Conference on Mass Storage Systems and Technologies in cooperation with the Twenty-First IEEE Conference on Mass Storage Systems and Technologies

    Science.gov (United States)

    Kobler, Ben (Editor); Hariharan, P. C. (Editor)

    2004-01-01

    MSST2004, the Twelfth NASA Goddard / Twenty-first IEEE Conference on Mass Storage Systems and Technologies has as its focus long-term stewardship of globally-distributed storage. The increasing prevalence of e-anything brought about by widespread use of applications based, among others, on the World Wide Web, has contributed to rapid growth of online data holdings. A study released by the School of Information Management and Systems at the University of California, Berkeley, estimates that over 5 exabytes of data was created in 2002. Almost 99 percent of this information originally appeared on magnetic media. The theme for MSST2004 is therefore both timely and appropriate. There have been many discussions about rapid technological obsolescence, incompatible formats and inadequate attention to the permanent preservation of knowledge committed to digital storage. Tutorial sessions at MSST2004 detail some of these concerns, and steps being taken to alleviate them. Over 30 papers deal with topics as diverse as performance, file systems, and stewardship and preservation. A number of short papers, extemporaneous presentations, and works in progress will detail current and relevant research on the MSST2004 theme.

  14. The Geochemical Society(GS)

    Institute of Scientific and Technical Information of China (English)

    Seth M.Davis

    2007-01-01

    @@ Mission The Geochemical Society is an international nonprofit organization for scientists involved in the practice,study and teaching of geochemistry.0ur principal roles are to understand and meet the needs of our members so as to provide them with programs and services that will help them be better geochemists;to empower geochemists through information,education,relationships and resources that will enrich their professional development and careers;and to advance the thought and application of geochemistry.

  15. IEEE Transactions on Engineering Management的发展历程及研究热点%Development History and Research Focus of IEEE Transactions on Engineering Management

    Institute of Scientific and Technical Information of China (English)

    陈悦; 李瑛

    2011-01-01

    利用知识计量学与知识图谱的方法技术,以SSCI数据库的论文为基础,对美国创新管理期刊IEEE Transactions on Engineering Management发展历程及其研究热点进行计量研究。通过对该期刊三个时间段知识群文献的分析,可看出该刊从侧重于技术管理的定量工具方法,到侧重于产品开发、项目管理与技术转移,再到侧重于组织、战略及政策管理的大致发展脉络。其当前创新管理研究热点,主要围绕“绩效”、“创新”、“管理”、“产品开发”、“系统”和“战略”展开。%Based on registed articles in SSCI, the paper took a metric research on the development history and research focus of ' IEEE Transactions on Engineering Management' by the means of scientometrics and knowledge mapping. The major aspects were the articles analysis in knowledge group of three different periods. The research focus change can be concluded : first, focus on the quantitative tools and methods of technical management; and then turn to product development, project management and technology transfer; at last focus on organization, strategy and policy management. Current innovation management research mainly focuses on the following aspects : performance, innovation, management, product development, system, strategy etc.

  16. 基于IEEE Std 1500标准的SOC可测性设计研究%Research of DFT of SOC based on IEEE Std 1500

    Institute of Scientific and Technical Information of China (English)

    周银; 周浔; 陈圣俭; 王月芳

    2012-01-01

    he technology of IP core based on SOC design is widely used, which is attribute to the rapid development of deep submicron meter manufacture technology and design technology of integrated circuit. Because of the fact that IP cores usually come from different providers and the incompatibility of interface between IP core providers and core users and aims at improving ease of test reuse and test integration with respect to the core based SOC. 1500 standard for embedded core test is presented to solve this problem. The detail includes the test architecture, usage of this standard and core test description language.%集成电路深亚微米制造技术和设计技术的迅速发展,使得基于IP核复用的SOC设计技术得到越来越广泛的应用,但由于IP核的来源不同,设计标准的不兼容等因素,使得SOC的测试变得越来越困难;IEEE为解决SOC的测试问题提出了嵌入式芯核测试标准IEEE Std 1500,致力于建立标准化的IP核供应商和用户之间的测试接口,简化核测试信息的复用;文章详细介绍了IEEE Std 1500标准的测试架构,使用方法和核测试描述语言CTL,同时给出标准中提出的SOC可测性设计方法.

  17. Optimal Throughput and Self-adaptability of Robust Real-Time IEEE 802.15.4 MAC for AMI Mesh Network

    Science.gov (United States)

    Shabani, Hikma; Mohamud Ahmed, Musse; Khan, Sheroz; Hameed, Shahab Ahmed; Hadi Habaebi, Mohamed

    2013-12-01

    A smart grid refers to a modernization of the electricity system that brings intelligence, reliability, efficiency and optimality to the power grid. To provide an automated and widely distributed energy delivery, the smart grid will be branded by a two-way flow of electricity and information system between energy suppliers and their customers. Thus, the smart grid is a power grid that integrates data communication networks which provide the collected and analysed data at all levels in real time. Therefore, the performance of communication systems is so vital for the success of smart grid. Merit to the ZigBee/IEEE802.15.4std low cost, low power, low data rate, short range, simplicity and free licensed spectrum that makes wireless sensor networks (WSNs) the most suitable wireless technology for smart grid applications. Unfortunately, almost all ZigBee channels overlap with wireless local area network (WLAN) channels, resulting in severe performance degradation due to interference. In order to improve the performance of communication systems, this paper proposes an optimal throughput and self-adaptability of ZigBee/IEEE802.15.4std for smart grid.

  18. Quality of Service Model on Data Link Layer for Mission Critical Traffic on IEEE 802.11g Networks in Infrastructure Mode

    Directory of Open Access Journals (Sweden)

    Gerald B. Fuenmayor-Rivadeneira

    2013-11-01

    Full Text Available This article presents a synthesized review as state of the art of the study of QoS for mission-critical traffic in wireless local area networks that use the IEEE 802.11g protocol. This is to highlight previous research for their contribution will constitute a reference to guide a proposed new approach to ensuring the quality of service for this type of traffic using the above protocol. The review is based on academic and business items made during the current five years. As a result of this review it is evident that there have been many efforts to address the issue but there are still gaps in the characterization of mission-critical traffic and ensuring quality of service for the same, due the new applications and the large host of WiFi networks in business and government, which has led to increased demand for access channels and, therefore, a challenge to the progress already known, such as IEEE 802.1q.

  19. THE INFLUENCE OF MAC BUFFER ON THE CONTENTION-BASED ACCESS SCHEME WITH BURSTING OPTION FOR IEEE 802.11E WIRELESS NETWORKS

    Directory of Open Access Journals (Sweden)

    S. SELVAKENNEDY

    2006-12-01

    Full Text Available Wireless LANs are increasingly being used for inelastic applications. Currently, there is little support for quality of service in the IEEE 802.11 MAC protocol, and IEEE task group E has defined the 802.11e MAC extension. Enhanced distributed channel access (EDCA is a contention-based scheme of the 802.11e standard. To allow a station to transmit more than one frame from a single contention, an optional feature known as controlled frame-bursting (CFB is introduced in the standard. In this paper, we initially performed an average analysis to determine a suitable burst duration limit. Then, a detailed evaluation and comparison of the EDCA protocol with the CFB option is carried out through simulation to quantify its performance gain. The impact of the MAC transmit buffer size is also incorporated. Accordingly, we have proposed a suitable approach to guide the configuration of the burst duration limit. It is demonstrated that an optimized CFB configuration allows the MAC protocol to achieve 30% more capacity than the basic EDCA scheme.

  20. WiGig and IEEE 802.11ad for Multi-Gigabyte- Per-Second WPAN and WLAN

    Institute of Scientific and Technical Information of China (English)

    Sai Shankar N; Debashis Dash; Hassan EI Madi; Guru Gopalakrishnan

    2012-01-01

    The Wireless Gigabit Alliance (WiGig) and I EEE 802.11 ad are developing a multigigabit wireless personal and local area network (WPAN/ WLAN) specification in the 60 GHz millimeter wave band. Chipset manufacturers, original equipment manufacturers (OEMs), and telecom companies are also assisting in this development. 60 GHz millimeter wave transmission will scale the speed of WLANs and WPANs to 6.75 Gbit/s over distances less than 10 meters. This technology is the first of its kind and will eliminate the need for cable around personal computers, docking stations, and other consumer electronic devices. High-definition multimedia interface (HDMI), display port, USB 3.0, and peripheral component interconnect express (PCle) 3.0 cables will all be eliminated. Fast downloads and uploads, wireless sync, and multi-gigabit-per-second WLANs will be possible over shorter distances. 60 GHz millimeter wave supports fast session transfer (FST) protocol, which makes it backward compatible with 5 GHz or 2.4 GHz WLAN so that end users experience the same range as in today' s WLANs. IEEE 802.1 lad specifies the physical (PHY) sublayer and medium access control (MAC) sublayer of the protocol stack. The MAC protocol is based on time-division multiple access (TDMA), and the PHY layer uses single carrier (SC) and orthogonal frequency division multiplexing (OFDM) to simultaneously enable low-power, high-performance applications.

  1. Practical experience with IEEE 1588 high precision time synchronization in electrical substation based on IEC 61850 process bus

    Energy Technology Data Exchange (ETDEWEB)

    Moore, R.; Goraj, M.J.; McGhee, J. [RuggedCom Inc., Concord, ON (Canada)

    2010-07-01

    This paper discussed a time synchronization and dynamic multicast filtering procedure conducted on an IEC 61850 process bus. The Institute of Electrical and Electronic (IEEE) 1588 time synchronization and dynamic multicast filtering procedure was conducted at a substation equipped with non-conventional instrument transformers (NCIT) and intelligent circuit breakers. The process bus interconnected IEDs within a bay that included a real time sampled value (SV) measurement system. The system was designed to reduce the use of copper wiring and to eliminate high energy signal processes. Digitized sampled measured values were sent from the electronic instrument transformers to protect and control relays. A merging unit was used to enable the transmission of the digitized current and voltage measurements across an ethernet network. Two sampling rates were supplied for power system monitoring and protection applications. The merging units continuously sent sampling values of current and voltages acquired from primary equipment. Precision time protocol systems were discussed, and issues related to time synchronization were reviewed. A network topology was provided. 4 refs., 4 figs.

  2. Energy Efficiency of the IEEE 802.15.4 Standard in Dense Wireless Microsensor Networks: Modeling and Improvement Perspectives

    CERN Document Server

    Bougard, Bruno; Daly, Denis C; Chandrakasan, Anantha; Dehaene, Wim

    2011-01-01

    Wireless microsensor networks, which have been the topic of intensive research in recent years, are now emerging in industrial applications. An important milestone in this transition has been the release of the IEEE 802.15.4 standard that specifies interoperable wireless physical and medium access control layers targeted to sensor node radios. In this paper, we evaluate the potential of an 802.15.4 radio for use in an ultra low power sensor node operating in a dense network. Starting from measurements carried out on the off-the-shelf radio, effective radio activation and link adaptation policies are derived. It is shown that, in a typical sensor network scenario, the average power per node can be reduced down to 211m mm mW. Next, the energy consumption breakdown between the different phases of a packet transmission is presented, indicating which part of the transceiver architecture can most effectively be optimized in order to further reduce the radio power, enabling self-powered wireless microsensor networks...

  3. Analysis, Modification, and Implementation (AMI) of Scheduling Algorithm for the IEEE 802.116e (Mobile WiMAX)

    CERN Document Server

    Ravichandiran, C; Vaidhyanathan, V

    2010-01-01

    Mobile WiMAX (Worldwide Interoperability for Microwave Access) is being touted as the most promising and potential broadband wireless technology. And the popularity rate has been surging to newer heights as the knowledge-backed service era unfolds steadily. Especially Mobile WiMAX is being projected as a real and strategic boon for developing counties such as India due to its wireless coverage acreage is phenomenally high. Mobile WiMAX has spurred tremendous interest from operators seeking to deploy high-performance yet cost-effective broadband wireless networks. The IEEE 802.16e standard based Mobile WiMAX system will be investigated for the purpose of Quality of Service provisioning. As a technical challenge, radio resource management will be primarily considered and main is the costly spectrum and the increasingly more demanding applications with ever growing number of subscribers. It is necessary to provide Quality of Service (QoS) guaranteed with different characteristics. As a possible solution the sche...

  4. IEEE 802.15.4 ZigBee-Based Time-of-Arrival Estimation for Wireless Sensor Networks.

    Science.gov (United States)

    Cheon, Jeonghyeon; Hwang, Hyunsu; Kim, Dongsun; Jung, Yunho

    2016-02-05

    Precise time-of-arrival (TOA) estimation is one of the most important techniques in RF-based positioning systems that use wireless sensor networks (WSNs). Because the accuracy of TOA estimation is proportional to the RF signal bandwidth, using broad bandwidth is the most fundamental approach for achieving higher accuracy. Hence, ultra-wide-band (UWB) systems with a bandwidth of 500 MHz are commonly used. However, wireless systems with broad bandwidth suffer from the disadvantages of high complexity and high power consumption. Therefore, it is difficult to employ such systems in various WSN applications. In this paper, we present a precise time-of-arrival (TOA) estimation algorithm using an IEEE 802.15.4 ZigBee system with a narrow bandwidth of 2 MHz. In order to overcome the lack of bandwidth, the proposed algorithm estimates the fractional TOA within the sampling interval. Simulation results show that the proposed TOA estimation algorithm provides an accuracy of 0.5 m at a signal-to-noise ratio (SNR) of 8 dB and achieves an SNR gain of 5 dB as compared with the existing algorithm. In addition, experimental results indicate that the proposed algorithm provides accurate TOA estimation in a real indoor environment.

  5. Fieldwork in Transforming Societies

    DEFF Research Database (Denmark)

    Clark, Ed; Michailova, Snejina

    The contributors to this text discuss the personal and professional challenges of conducting fieldwork in the difficult, sometimes threatening contexts of the transforming societies of post-socialist Europe and China.......The contributors to this text discuss the personal and professional challenges of conducting fieldwork in the difficult, sometimes threatening contexts of the transforming societies of post-socialist Europe and China....

  6. The Tranquebarian Society

    DEFF Research Database (Denmark)

    Jensen, Niklas Thode

    2015-01-01

    of this development was the establishment of the Tranquebarian Society, the third learned society east of the Cape of Good Hope. The article examines the unique assemblage of scientific networks, people, instruments, institutions, and ideas of local and global origin that converged in Tranquebar, and it investigates...

  7. The Tranquebarian Society

    DEFF Research Database (Denmark)

    Jensen, Niklas Thode

    2015-01-01

    of this development was the establishment of the Tranquebarian Society, the third learned society east of the Cape of Good Hope. The article examines the unique assemblage of scientific networks, people, instruments, institutions, and ideas of local and global origin that converged in Tranquebar, and it investigates...

  8. American Society of Neuroradiology

    Science.gov (United States)

    ASNR American Society of Neuroradiology Forgot username or password ? .: International Day Of Radiology :. Tues, Nov 8 is International Day of Radiology. ... you celebrate, #neurorad? #IDoR2016 Once again, the European Society of Radiology has created a wonderful ... Tues, Nov ...

  9. Transformation of Neolithic Societies

    DEFF Research Database (Denmark)

    Iversen, Rune

    and prepared the way for the appearance of Bronze Age societies. The great era of megalithic architecture came to an end as the production and exchange of gold, copper and bronze objects became the driving force in the development of Copper and Bronze Age societies. This development also had a great influence...

  10. Refractions of Civil Society

    DEFF Research Database (Denmark)

    Kuzmanovic, Daniella

    The thesis investigates various perceptions of civil society among civic activists in Turkey, and how these perceptions are produced and shaped. The thesis is an anthropological contribution to studies of civil society in general, as well as to studies on political culture in Turkey....

  11. The Society for Scandinavian Art

    DEFF Research Database (Denmark)

    Grand, Karina Lykke

    2016-01-01

    The Society for Nordic Art & the Scandinavian Society [Selskabet for Nordisk Kunst & Skandinavisk Selskab]......The Society for Nordic Art & the Scandinavian Society [Selskabet for Nordisk Kunst & Skandinavisk Selskab]...

  12. Analysis of ISO/IEEE 11073 built-in security and its potential IHE-based extensibility.

    Science.gov (United States)

    Rubio, Óscar J; Trigo, Jesús D; Alesanco, Álvaro; Serrano, Luis; García, José

    2016-04-01

    The ISO/IEEE 11073 standard for Personal Health Devices (X73PHD) aims to ensure interoperability between Personal Health Devices and aggregators-e.g. health appliances, routers-in ambulatory setups. The Integrating the Healthcare Enterprise (IHE) initiative promotes the coordinated use of different standards in healthcare systems (e.g. Personal/Electronic Health Records, alert managers, Clinical Decision Support Systems) by defining profiles intended for medical use cases. X73PHD provides a robust syntactic model and a comprehensive terminology, but it places limited emphasis on security and on interoperability with IHE-compliant systems and frameworks. However, the implementation of eHealth/mHealth applications in environments such as health and fitness monitoring, independent living and disease management (i.e. the X73PHD domains) increasingly requires features such as secure connections to mobile aggregators-e.g. smartphones, tablets-, the sharing of devices among different users with privacy, and interoperability with certain IHE-compliant healthcare systems. This work proposes a comprehensive IHE-based X73PHD extension consisting of additive layers adapted to different eHealth/mHealth applications, after having analyzed the features of X73PHD (especially its built-in security), IHE profiles related with these applications and other research works. Both the new features proposed for each layer and the procedures to support them have been carefully chosen to minimize the impact on X73PHD, on its architecture (in terms of delays and overhead) and on its framework. Such implications are thoroughly analyzed in this paper. As a result, an extended model of X73PHD is proposed, preserving its essential features while extending them with added value. Copyright © 2016 Elsevier Inc. All rights reserved.

  13. DoS detection in IEEE 802.11 with the presence of hidden nodes

    Directory of Open Access Journals (Sweden)

    Joseph Soryal

    2014-07-01

    Full Text Available The paper presents a novel technique to detect Denial of Service (DoS attacks applied by misbehaving nodes in wireless networks with the presence of hidden nodes employing the widely used IEEE 802.11 Distributed Coordination Function (DCF protocols described in the IEEE standard [1]. Attacker nodes alter the IEEE 802.11 DCF firmware to illicitly capture the channel via elevating the probability of the average number of packets transmitted successfully using up the bandwidth share of the innocent nodes that follow the protocol standards. We obtained the theoretical network throughput by solving two-dimensional Markov Chain model as described by Bianchi [2], and Liu and Saadawi [3] to determine the channel capacity. We validated the results obtained via the theoretical computations with the results obtained by OPNET simulator [4] to define the baseline for the average attainable throughput in the channel under standard conditions where all nodes follow the standards. The main goal of the DoS attacker is to prevent the innocent nodes from accessing the channel and by capturing the channel’s bandwidth. In addition, the attacker strives to appear as an innocent node that follows the standards. The protocol resides in every node to enable each node to police other nodes in its immediate wireless coverage area. All innocent nodes are able to detect and identify the DoS attacker in its wireless coverage area. We applied the protocol to two Physical Layer technologies: Direct Sequence Spread Spectrum (DSSS and Frequency Hopping Spread Spectrum (FHSS and the results are presented to validate the algorithm.

  14. DoS detection in IEEE 802.11 with the presence of hidden nodes.

    Science.gov (United States)

    Soryal, Joseph; Liu, Xijie; Saadawi, Tarek

    2014-07-01

    The paper presents a novel technique to detect Denial of Service (DoS) attacks applied by misbehaving nodes in wireless networks with the presence of hidden nodes employing the widely used IEEE 802.11 Distributed Coordination Function (DCF) protocols described in the IEEE standard [1]. Attacker nodes alter the IEEE 802.11 DCF firmware to illicitly capture the channel via elevating the probability of the average number of packets transmitted successfully using up the bandwidth share of the innocent nodes that follow the protocol standards. We obtained the theoretical network throughput by solving two-dimensional Markov Chain model as described by Bianchi [2], and Liu and Saadawi [3] to determine the channel capacity. We validated the results obtained via the theoretical computations with the results obtained by OPNET simulator [4] to define the baseline for the average attainable throughput in the channel under standard conditions where all nodes follow the standards. The main goal of the DoS attacker is to prevent the innocent nodes from accessing the channel and by capturing the channel's bandwidth. In addition, the attacker strives to appear as an innocent node that follows the standards. The protocol resides in every node to enable each node to police other nodes in its immediate wireless coverage area. All innocent nodes are able to detect and identify the DoS attacker in its wireless coverage area. We applied the protocol to two Physical Layer technologies: Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS) and the results are presented to validate the algorithm.

  15. Planning of Efficient Wireless Access with IEEE 802.16 for Connecting Home Network to the Internet

    Directory of Open Access Journals (Sweden)

    Krairit Donyaprueth

    2010-01-01

    Full Text Available The emergence of IEEE802.16 wireless standard technology (WiMAX has significantly increased the choice to operators for the provisioning of wireless broadband access network. WiMAX is being deployed to compliment with xDSL in underserved or lack of the broadband network area, in both developed and developing countries. Many incumbent operators in developing countries are considering the deployment of WiMAX as part of their broadband access strategy. This paper presents an efficient and simple method for planning of broadband fixed wireless access (BFWA with IEEE802.16 standard to support home connection to Internet. The study formulates the framework for planning both coverage and capacity designs. The relationship between coverage area and access rate from subscriber in each environment area is presented. The study also presents the throughput and channel capacity of IEEE802.16 in different access rates. An extensive analysis is performed and the results are applied to the real case study to demonstrate the practicality of using IEEE 802.16 for connecting home to Internet. Using empirical data and original subscriber traffic from measurement, it is shown that the BFWA with IEEE802.16 standard is a capacity limited system. The capacity of IEEE802.16 is related to different factors including frequency bandwidth, spectrum allocation, estimation of traffic per subscriber, and choice of adaptive modulation from subscriber terminal. The wireless access methods and procedures evolved in this research work and set out in this paper are shown to be well suited for planning BFWA system based on IEEE802.16 which supports broadband home to Internet connections.

  16. Impact of cell load on 5GHz IEEE 802.11 WLAN

    OpenAIRE

    Abu-Tair, Mamoun; Bhatti, Saleem Noel

    2017-01-01

    We have conducted an empirical study of the latest 5GHz IEEE 802.11 wireless LAN (WLAN) variants of 802.11n (5GHz) and 802.11ac (Wave 1), under different cell load conditions. We have considered typical configurations of both protocols on a Linux testbed. Under light load,there is no clear difference between 802.11n and 802.11ac in terms of performance and energy consumption. However, in some cases of high cell load, we have found that there may be a small advantage with 802.11ac. Overall, we...

  17. Connectivity-Based Reliable Multicast MAC Protocol for IEEE 802.11 Wireless LANs

    Directory of Open Access Journals (Sweden)

    Woo-Yong Choi

    2009-01-01

    Full Text Available We propose the efficient reliable multicast MAC protocol based on the connectivity information among the recipients. Enhancing the BMMM (Batch Mode Multicast MAC protocol, the reliable multicast MAC protocol significantly reduces the RAK (Request for ACK frame transmissions in a reasonable computational time and enhances the MAC performance. By the analytical performance analysis, the throughputs of the BMMM protocol and our proposed MAC protocol are derived. Numerical examples show that our proposed MAC protocol increases the reliable multicast MAC performance for IEEE 802.11 wireless LANs.

  18. Rate Adaptation Based on Collision Probability for IEEE 802.11 WLANs

    Science.gov (United States)

    Kim, Taejoon; Lim, Jong-Tae

    Nowadays IEEE 802.11 wireless local area networks (WLANs) support multiple transmission rates. To achieve the best performance, transmitting stations adopt the various forms of automatic rate fallback (ARF). However, ARF suffers from severe performance degradation as the number of transmitting stations increases. In this paper, we propose a new rate adaptation scheme which adjusts the ARF's up/down threshold according to the channel contention level. Simulation result shows that the proposed scheme achieves fairly good performance compared with the existing schemes.

  19. Adaptive rate selection scheme for video transmission to resolve IEEE 802.11 performance anomaly

    Science.gov (United States)

    Tang, Guijin; Zhu, Xiuchang

    2011-10-01

    Multi-rate transmission may lead to performance anomaly in an IEEE 802.11 network. It will decrease the throughputs of all the higher rate stations. This paper proposes an adaptive rate selection scheme for video service when performance anomaly occurs. Considering that video has the characteristic of tolerance to packet loss, we actively drop several packets so as to select the rates as high as possible for transmitting packets. Experiment shows our algorithm can decrease the delay and jitter of video, and improve the system throughput as well.

  20. Distributed Fair Access Point Selection for Multi-Rate IEEE 802.11 WLANs

    Science.gov (United States)

    Gong, Huazhi; Nahm, Kitae; Kim, Jongwon

    In IEEE 802.11 networks, the access point (AP) selection based on the strongest signal strength often results in the extremely unfair bandwidth allocation among mobile users (MUs). In this paper, we propose a distributed AP selection algorithm to achieve a fair bandwidth allocation for MUs. The proposed algorithm gradually balances the AP loads based on max-min fairness for the available multiple bit rate choices in a distributed manner. We analyze the stability and overhead of the proposed algorithm, and show the improvement of the fairness via computer simulation.

  1. A Novel Energy Saving Algorithm with Frame Response Delay Constraint in IEEE 802.16e

    Science.gov (United States)

    Nga, Dinh Thi Thuy; Kim, Mingon; Kang, Minho

    Sleep-mode operation of a Mobile Subscriber Station (MSS) in IEEE 802.16e effectively saves energy consumption; however, it induces frame response delay. In this letter, we propose an algorithm to quickly find the optimal value of the final sleep interval in sleep-mode in order to minimize energy consumption with respect to a given frame response delay constraint. The validations of our proposed algorithm through analytical results and simulation results suggest that our algorithm provide a potential guidance to energy saving.

  2. Saturation Throughput - Delay Analysis of IEEE 802.11 DCF in Fading Channel

    CERN Document Server

    Hadzi-Velkov, Zoran

    2010-01-01

    In this paper, we analytically analyzed the impact of an error-prone channel over all performance measures in a trafficsaturated IEEE 802.11 WLAN. We calculated station's transmission probability by using the modified Markov chain model of the backoff window size that considers the frame-error rates and maximal allowable number of retransmission attempts. The frame error rate has a significant impact over theoretical throughput, mean frame delay, and discard probability. The peak throughput of a WLAN is insensitive of the maximal number of retransmissions. Discard probabilities are insensitive to the station access method, Basic or RTS/CTS.

  3. Design and Implementation of DSP——Based IEEE802.16a OFDM System

    Institute of Scientific and Technical Information of China (English)

    QIU Run-he; XIE Ying-hua; SHEN Xiong-wei; HAN Han-guang; LIU Chao

    2009-01-01

    A set of integrated Orthogonal Frequency Division Multiplexing (OFDM) modulation and demodulation system is proposed and its performance is verified in reference to the standard of IEEE802.16a for WMAN. The design, combined with analogy front-end, adopts Texas Instrument ( TI ) Company's 6701 evaluation module (EVM) to construct digital Intermediate Frequency (IF) platform. A DSP-based baseband processing software module is embedded into the system. The proposed scheme makes it possible for users to select various software modules to set up corrections with different throughput performance. Taking into account the given hardware configuration, the design aims to optimize the algorithm modules to accomplish better system performance.

  4. Experimental Performances Analysis of Load Balancing Algorithms in IEEE 802.11

    CERN Document Server

    Salah, Hamdi; Rached, Tourki

    2009-01-01

    In IEEE 802.11, load balancing algorithms (LBA) consider only the associated stations to balance the load of the available access points (APs). However, although the APs are balanced, it causes a bad situation if the AP has a lower signal length (SNR) less than the neighbor APs. So, balance the load and associate one mobile station to an access point without care about the signal to noise ratio (SNR) of the AP cause possibly an unforeseen QoS, such as the bit rate, the end to end delay, the packet loss. In this way, we study an improvement load balancing algorithm with SNR integration at the selection policy.

  5. Design and implementation of IEEE 802.11ac MAC controller in 65 nm CMOS process

    Science.gov (United States)

    Peng, Cheng; Bin, Wu; Yong, Hei

    2016-02-01

    An IEEE-802.11ac-1*1 wireless LAN system-on-a-chip (SoC) that integrates an analog front end, a digital base-band processor and a media access controller has been implemented in 65 nm CMOS technology. It can provide significantly increased throughput, high efficiency rate selection, and fully backward compatibility with the existing 802.11a/n WLAN protocols. Especially the measured maximum throughput of UDP traffic can be up to 267 Mbps. Project supported by the National Great Specific Project of China (No. 2012ZX03004004_001).

  6. IEEE 802.11 Distributed Coordination Function:Enhancement and Analysis

    Institute of Scientific and Technical Information of China (English)

    WU HaiTao(邬海涛); LIN Yu(林宇); CHENG ShiDuan(程时端); PENG Yong(彭泳); LONG KePing(隆克平)

    2003-01-01

    IEEE 802.11 Medium Access Control (MAC) is proposed to support asynchronousand time bounded delivery of radio packets. Distributed Coordination Function (DCF), which uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and binary slotted exponent ial backoff, is the basis of the 802.11 MAC. This paper proposes a throughput enhancement forDCF by adjusting the Contention Window (CW) setting scheme. Moreover, an analytical modelbased on Markov chain is introduced to compute the enhanced throughput. The accuracy of themodel and the enhancement of the proposed scheme are verified by elaborate simulations.

  7. Achieving Efficient Channel Utilization for Data Communications in IEEE 802.11 WLAN

    Institute of Scientific and Technical Information of China (English)

    ZHANG Liang; SHU Yantai

    2005-01-01

    In the IEEE 802. 11 protocol, the adoption of the exponential backoff technique leads to throughput performance strongly dependent on the initial contention window size and, most importantly, on the number of contending stations considered in the network. This paper proposes a simpie but accurate method to dynamically estimate the number of contending stations in a wireless local area network (WLAN). Based on estimation, all the mobile stations dynamically adjust the initial contention window in medium access control (MAC) layer to avoid collisions. The simulation results show that the proposed algorithm can achieve efficient channel utilization, higher system throughput, and better fairness performance.

  8. Estimation Algorithm of Contending Stations Based on Improved DCF Model in IEEE 802.11

    Institute of Scientific and Technical Information of China (English)

    HU He-fei; LIU Yuan-an; LI Shu-lan

    2004-01-01

    The fundamental access method of IEEE 802.11 is a DCF known as carrier sense multiple access with collision avoidance (CSMA/CA) scheme with exponential back-off. RTS_threshold is used to determine whether to deploy RTS/CTS access method. This threshold should vary with the number of contending stations which contend wireless media to get better throughput. The paper proposes an algorithm which estimates the number of contending stations in BSS. The algorithm is shown to be accurate which is verified by elaborate simulations.

  9. Latency and Jitter Analysis for IEEE 802.11e Wireless LANs

    Directory of Open Access Journals (Sweden)

    Sungkwan Youm

    2013-01-01

    Full Text Available This paper presents a numerical analysis of latency and jitter for IEEE 802.11e wireless local area networks (WLANs in a saturation condition, by using a Markov model. We use this model to explicate how the enhanced distributed coordination function (EDCF differentiates classes of service and to characterize the probability distribution of the medium access control (MAC layer packet latency and jitter, on which the quality of the voice over Internet protocol (VoIP calls is dependent. From the proposed analytic model, we can estimate the available number of nodes determining the system performance, in order to satisfy user demands on the latency and jitter.

  10. Conception and FPGA implementation of IEEE 802.11s mesh network MAC layer transmitter

    CERN Document Server

    Chaari, Lamia; Kamoun, Lotfi

    2010-01-01

    This paper proposes, a hardware implementation of Wireless Mesh Networks (WMN) medium Access Controller (MAC) layer transmitter. In the literature a lot of works are focused on WMN routing protocol as well as performance analysis and software integration of WMN units, however few works deals with WMN hardware implementation. In this field our contribution is to conceive and to implements on FPGA a WMN MAC transmitter module. Our implementation, written in hardware description language (HDL) is based on the IEEE 802.11 s standard. The hardware implementation retains a good performance in speed.

  11. An Effective Capacity Estimation Scheme in IEEE802.11-based Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    H. Zafar

    2012-11-01

    Full Text Available Capacity estimation is a key component of any admission control scheme required to support quality of serviceprovision in mobile ad hoc networks. A range of schemes have been previously proposed to estimate residualcapacity that is derived from window-based measurements of channel estimation. In this paper a simple and improvedmechanism to estimate residual capacity in IEEE802.11-based ad hoc networks is presented. The scheme proposesthe use of a ‘forgiveness’ factor to weight these previous measurements and is shown through simulation-basedevaluation to provide accurate utilizations estimation and improved residual capacity based admission control.

  12. Acupuncture in modern society.

    Science.gov (United States)

    Vanderploeg, Kristin; Yi, Xiaobin

    2009-03-01

    For at least 2,500 years, acupuncture has been an integral part of traditional Chinese medicine. However, recently as more people in western countries are diagnosed with chronic disease poorly treated with modern medical therapies, many are turning to acupuncture and other forms of alternative medical treatments. Based on the theory of harmonious flowing qi being the basis of good health, acupuncture focuses on restoring qi by manipulation of the complementary and opposing elements of yin and yang. However, in the modern medical community we struggle to with the concept of qi, given a lack of anatomic and histological evidence supporting its existence. However, with the surge in public interest in acupuncture, the scientific community begun heavy investigation of acupuncture's efficacy, as well as the physiologic basis behind it. Thus far, evidence supports the use of acupuncture in post-operative nausea and vomiting, postoperative dental pain, chronic pain conditions such as lower back pain, and possibly also such psychologic conditions as addiction. It is possible that by affecting afferent nerve signaling, acupuncture may influence the release of endogenous opioids to promote pain relief. This effect may be augmented by release of ACTH and cortisol, as well as through down-regulation of signaling through pain fibers. When treating patients who may utilize alternative forms of medicine, it is important that medical practitioners be educated in regards to the basic fundamental beliefs behind acupuncture, as well as the scientific evidence supporting its use and revealing its efficacy. The purpose of this review is to give western trained physicians exposure to history, basic knowledge and its clinical applications of acupuncture to accommodate accelerating interests in acupuncture in modern society.

  13. Information society studies

    CERN Document Server

    Duff, Alistair S

    2013-01-01

    We are often told that we are ""living in an information society"" or that we are ""information workers."" But what exactly do these claims mean, and how might they be verified? In this important methodological study, Alistair S. Duff cuts through the rhetoric to get to the bottom of the ""information society thesis."" Wide-ranging in coverage, this study will be of interest to scholars in information science, communication and media studies and social theory. It is a key text for the newly-unified specialism of information society studies, and an indispensable guide to the future of this disc

  14. Fairness in society

    CERN Document Server

    Flomenbom, Ophir

    2011-01-01

    Models that explain the economical and political realities of nowadays societies should help all the world's citizens. Yet, the last four years showed that the current models are missing. Here we develop a dynamical society-deciders model showing that the long lasting economical stress can be solved when increasing fairness in nations. fairness is computed for each nation using indicators from economy and politics. Rather than austerity versus spending, the dynamical model suggests that solving crises in western societies is possible with regulations that reduce the stability of the deciders, while shifting wealth in the direction of the people. This shall increase the dynamics among socio-economic classes, further increasing fairness.

  15. Climate and Ancient Societies

    DEFF Research Database (Denmark)

    Climate, and human responses to it, have a strongly interconnected relationship. This when climate change occurs, the result of either natural or human causes, societies should react and adapt to these. But do they? If so, what is the nature of that change, and are the responses positive...... or negative for the long-term survival of social groups? In this volume, scholars from diverse disciplines including archaeology, geology and climate sciences explore scientific and material evidence for climate changes in the past, their causes, their effects on ancient societies and how those societies...

  16. [Recommendations of the Austrian Society of Rheumatology/Austrian Radiology-Rheumatology Initiative for Musculoskeletal Ultrasound for the application of ultrasound in rheumatology].

    Science.gov (United States)

    Duftner, Christina; Dejaco, Christian; Kainberger, Franz; Machold, Klaus; Mandl, Peter; Nothnagl, Thomas; DeZordo, Tobias; Husic, Rusmir; Schüller-Weidekamm, Claudia; Schirmer, Michael

    2014-12-01

    It is the current goal in rheumatology to diagnose and treat inflammatory rheumatic diseases early in order to avoid structural damage. Functional imaging methods such as musculoskeletal sonography are increasingly used to support the clinical diagnosis. To ascertain the quality of ultrasound assessments performed by rheumatologists in Austria, the Austrian Radiology-Rheumatology Initiative for Musculoskeletal Ultrasound (ARRIMUS) proposed recommendations for a training curriculum, technical standards for ultrasound equipment, minimum requirements for documentation, indications for sonography and the use of ultrasound for interventions. These recommendations have been endorsed by the Austrian Society of Rheumatology and should aid rheumatologists to perform high quality ultrasound assessment in clinical practice.

  17. Long-Distance IEEE 802.11 Wireless Mesh Networks: A Survey%基于IEEE 802.11的长距离无线Mesh网络

    Institute of Scientific and Technical Information of China (English)

    赵增华; 王楠; 窦志斌; 张连芳; 舒炎泰

    2012-01-01

    基于IEEE 802.11的长距离无线Mesh网络(LDmesh)的单跳链路长度在几十到上百公里,具有带宽高、成本低、覆盖广等优点,可广泛应用于偏远乡村或人口分布稀疏地区的无线宽带接入等.LDmesh网络是点到点的链路,链路的干扰特性和传输特性与传统无线Mesh网络有显著不同,原有的基于CSMA的MAC协议不再适用,进而影响到上层协议的设计.分析了LDmesh网络的研究进展,从链路性能、MAC协议、路由协议及网络管理等方面深入论述了LDmesh网络面临的挑战和进一步研究方向.%Long-distance IEEE 802. 11 wireless Mesh networks (LDmesh) have been emerged in recent years for its high bandwidth, low cost and large coverage. It can be applied in rural regions or sparse-populated areas to provide high-bandwidth Internet access. In LDmesh networks, links are point-to-point and as long as tens to hundreds of kilometers. To achieve the long range, the wireless nodes are usually equipped with high-power (e. g. 400 mW) 802. 11 wireless cards and high-gain (e. g. 32dBi) directional antennas. The links in one node cannot transmit or receive da-ta simultaneously because of the inter-link interference. The traditional CSMA/CA MAC proto-col suffers poor performance in such a network for its long propagation delay, ACK timeout and inter-link interference. Therefore new TDMA-type MAC protocols have been proposed to solve the above issues, such as 2P MAC, WiLDNet and JazzyMac. The upper layer protocols such as routing and network management thus face great challenges and appeal new design diagram. In this paper, we introduce the fundamental concepts of LDmesh networks, survey the research ac-tivities in recent years, and discuss in depth the challenges in terms of link performance, MAC protocols, routing protocols and network management. The future work is also discussed.

  18. Application Value of College Student Honesty in Contemporary Society%大学生诚信在当代社会中的运用价值

    Institute of Scientific and Technical Information of China (English)

    张文俊

    2013-01-01

    诚信作为道德品质的重要组成部分,对于个人的成长成才、社会的进步发展具有不言而喻的重要作用.由于多方面的原因,大学生这个群体中逐步凸显出了一些亟待解决的诚信问题,这些问题不利于社会的发展.诚信的社会价值体现在多方面,倡导诚信教育,是适应社会发展,培养优秀人才的基本要求.%Honest as an important part of moral quality has the important role in personal growth, the progress of the society development. Due to various reasons, college students gradually highlight some of the problem to be solved. These problems are not conducive to the development of the society. Social value reflects in many aspects. Advocating honesty education is the basic requirement to adapt to social development and cultivate talents.

  19. Changing anthropology, changing society.

    Science.gov (United States)

    Varughese, Heather

    2009-12-01

    Fifty years after the founding of the field of medical anthropology, the Society for Medical Anthropology of the American Anthropological Association held its first independent meeting on September 24-27, 2009, at Yale University.

  20. Valie EXPORT Society Rooseumis

    Index Scriptorium Estoniae

    2002-01-01

    Malmös Rooseumi Kaasaegse Kunsti Keskuses näitus "Baltic Babel". Projekt koosneb Läänemeremaade linnades tegutsevate innovatiivsete gruppide aktsioonidest. Kuraator Charles Esche. Esinejatest (Eestist Valie Export Society: Kadi Estland, Killu Sukmit)