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报告分类:外文技术报告 检索词:1

  • 341.EPS/LTE和WLAN/802.11的安全性比较研究

    [信息传输、软件和信息技术服务业] [2013-12-13]

    Security in the wireless access network gained increasing interest over the last years. Its implementation varies from one access network to another. The current trend in wireless access network is towards implementing mechanisms for mobility management namely handoff process and quality of service control. Consequently, security should be taken into consideration at each handoff process which may occur between different technologies (inter-technology) or within the same (intra-technology). At the same time, security provisioning impact on network performances (e.g. end-to-end delay, throughput) should be controlled. This chapter aims to give a better understanding of security measures and protocols available in two distinct wireless network families, namely the Wireless Wide Area Network (WWAN) and the Wireless Local Area Network (WLAN). WWAN family includes the wide coverage area technologies such as the Long-term Evolution (LTE), also named as Evolved Packet System (EPS). On the other hand, WLAN are characterized by having a small coverage area. It includes the WiFi (802.11) technology. Each time, the chapter highlights the mechanisms employed by access network to ensure the trade-off between secured mobility and application requirements in terms of delay and throughput.
    关键词:电子信息;信息安全;网络安全;EPS / LTE;WLAN / 802.11
  • 342.城市和交通数据系统,2012年

    [信息传输、软件和信息技术服务业,交通运输、仓储和邮政业] [2013-12-13]

    The report consists of 20 papers that explore patterns of use of transport modes; regional traffic congestion; the detection layout problem; multisensor data integration and fusion; commuters' demographic characteristics; average travel time estimates; short-term travel time prediction; vehicle reidentification and travel time estimation; travel time reliability; route-specific origin-destination tables; travel time data quality; fixed-point and probe-based detection systems; aggregate loop detector data; traffic ground truth estimation; video detection data; annual average daily traffic volume; estimating traffic speeds; travel times; lidar-based vehicle classification; and thermal image video sensors.
    关键词:电子信息;系统;交通数据
  • 343.交通事故管理系统——2012年3月

    [交通运输、仓储和邮政业,信息传输、软件和信息技术服务业] [2013-12-13]

    In 2003, the U.S. Fire Administration (USFA) announced a goal to reduce firefighter fatalities by 25 perent within 5 years and 50 percent within 10 years. It also committed to doing research that would support that goal. The consistently high annual percentage of fatalities related to fire department response and roadway scene operations prompted the USFA to look at several aspects related to these collisions in an effort to improve responder safety.
    关键词:电子信息;系统;交通事故管理
  • 344.准备IBM的纯应用系统,第4部分:使用高级中间件配置工具V1.1入职培训应用到云计算

    [信息传输、软件和信息技术服务业] [2013-12-10]

    Using IBM PureApplication System, you can create and deploy virtual servers in the cloud thatrepresent middleware topologies and application configurations. However, you still face thechallenge of moving existing applications onto the cloud and automating them.This article describes how to capture and automate the deployment of a middleware topologyand application by using Advanced Middleware Configuration. This process is known as"onboarding." Before you begin, read through the instructions and make sure you have thenecessary permissions for all the steps you need to complete.
    关键词:纯应用系统;可视化应用;高级中间件;架构服务
  • 345.氮化镓(GaN)高功率电子产品(FY11)

    [计算机、通信和其他电子设备制造业] [2013-12-08]

    This report covers work done for the Director's Research Initiative (DSI) on Gallium Nitride (GaN) High Power Electronics (HPE) in which GaN devices are assessed in comparison to those fabricated from silicon carbide (SiC). We show that for low power applications (less than 1500 V) GaN diodes should have a lower on-resistance, and therefore less loss, than their SiC counterparts because the critical breakdown field and electron mobility are larger. We expect this will also be true for HPE GaN high electron mobility transistors (HEMTs) compared to SiC metal-oxide-semiconductor field effect transistors (MOSFETs). Although a few GaN devices have been made that have properties that exceed those made from SiC, these devices cannot yet be manufactured. Our work suggests the dominant problem is contamination of the metal-organic chemical vapor deposition (MOCVD) films by the carbon in the trimethyl gallium (TMGa). We suggest a better alternative is to grow the films by hydride vapor phase epitaxy (HVPE), which requires that conducting GaN substrates be grown to reduce the on-resistance (RON-SP) for the back side diodes. We also show that dislocations appear to strongly affect diode properties such as the ideality factor, but their effect on the breakdown voltage appears to be a less significant problem than was previously thought.
    关键词:电子信息;电子;氮化镓;高功率
  • 346.探索先进的分析平台,第1部分:使用大数据和先进的分析支持您的业务需求

    [信息传输、软件和信息技术服务业] [2013-12-05]

    Analytics platforms are increasingly important with the growth of big data. Learn about the keycharacteristics of the platforms and the underlying components. This article is the first of aseries that will help you design and implement such a platform.
    关键词:特征;先进的分析平台;业务需求
  • 347.国家癌症研究所2010年的补充和替代医学的年度报告

    [医药制造业] [2013-12-03]

    The research the National Cancer Institute (NCI) supports, both in our own laboratories and at institutions worldwide, is focused on the ultimate goal of helping cancer patients. That mission achieved through rigorous science extends to NCIs program on complementary and alternative medicine, also known as CAM. Among the highlights of NCIs CAM-related activities in fiscal year (FY) 2010, was the collaboration between NCI, the National Institutes of Healths Office of Dietary Supplements (ODS), and the National Center for Complementary and Alternative Medicine (NCCAM) to co-fund two Botanical Research Centers. The Botanical Research Centers Program aims to promote collaborative, integrated, interdisciplinary study of botanicals, particularly those found as ingredients in dietary supplements, and to conduct research with high potential for being translated into practical benefits for human health.
    关键词:医药;医学研究;癌症;治疗;疾病防治
  • 348.为国家水质评估项目采集可变性的农药检测和浓度的现场复制水样,1992-97。

    [水利、环境和公共设施管理业,化学原料和化学制品制造业] [2013-11-28]

    Field replicate water samples ('field Replicates') collected for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program during 1992 to 1997 were used to assess the variability of pesticide detections and concentrations in environmental water samples collected from the surface and ground-water-quality networks of the NAWQA Program. Field replicates are two or more identically collected, processed, and analyzed environmental water samples that are used to assess the overall variability of field and laboratory procedures. Variability is the degree of random error in independent measurements of the same quantity and is the opposite of precision-the degree of mutual agreement. Information on variability can be used to estimate the reproducibility of individual measurements, the concentration needed to be assured of exceeding a water-quality standard, and the likelihood that two measurements of water quality are different.
    关键词:农药;水质
  • 349.加州粮食和农业部门合同协议号98-0241的最终报告。加州杀虫剂的使用报告的数据质量。

    [农、林、牧、渔业,化学原料和化学制品制造业] [2013-11-28]

    The California Department of Pesticide Regulation's (DPR's) Pesticide Use Report (PUR) is probably the largest and most complete database on pesticide use in the world. A system to collect information on pesticide use in California has been in operation in some form for over 50 years, with the current use reporting system started in 1990. The PUR contains information on nearly all production agricultural pesticide use and some nonagricultural use in California. The data collected include the pesticide product used, the date it was applied, the particular field treated, and application location to a square-mile section. Production agricultural use includes applications to growing crops, agricultural fields, and most applications to forest trees and ornamental turf. Other pesticide uses reported to DPR include post-harvest commodity treatments, right of way, landscapes, structural use, and other nonagricultural uses by commercial applicators. Because of the importance of the PUR for many groups and individuals, it is critical that the database be an accurate and complete as possible.
    关键词:农药;杀虫剂;使用
  • 350.智能交通系统和公路车辆自动化,2012

    [交通运输、仓储和邮政业,计算机、通信和其他电子设备制造业,信息传输、软件和信息技术服务业] [2013-11-25]

    This report consists of 15 papers that explore intervehicle safety warning information systems; travel time prediction; intersection decision support in adverse weather conditions; creation of CityMobil; real-time freeway end-of-queue alerting systems; traffic incident detection; vehicle class-specific route guidance; cooperative adaptive cruise control; dynamic parking guidance; vehicle platoon control; advanced traffic management systems; open road tolling; onboard sensing system for intersection safety; coordination of automated guided vehicles at intersections; and vehicle-to-infrastructure and vehicle-to-vehicle information systems in work zones.
    关键词:电子信息;智能交通;公路车辆;自动化
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