Study on Service Level Management in Integrated Satellite Information Network

Integrated Satellite Information Network (ISIN) includes those nodes in space and those on ground. It is the way to realize the fusion of satellite communication and traditional network technology. A satellite network management system based on Multiplex Network Management Protocol (MNMP) has accomplished traditional management, such as configuration, performance and fault management. An architecture of Service Level Management (SLM) in ISIN is proposed, and a service topology management and Service Level Agreement (SLA) are deeply researched. At last, service security and fault management are briefly discussed, and a simulation system is accomplished.     

User selection scheme with limited feedback processing and outdated CSI in multiuser relay networks

A new user selection strategy is investigated and analyzed in a multiuser relaying environment in the presence of co‐channel interference. The proposed selection scheme aims at avoiding unnecessary feedback load processing, in cases where a target threshold, in the received instantaneous signal‐to‐noise ratio, is exceeded. Assuming that perfect channel state information is available, closed‐form lower bound expressions are derived for the cumulative distribution function of the output signal to interference plus noise ratio. Moreover, the impact of outdated channel state information on the system's performance is also investigated. In addition, under the assumption of high signal‐to‐noise ratio conditions, simplified approximated expressions are also provided for the cumulative distribution functions of the output signal to interference plus noise ratio, which are employed to study the outage probability and bit error probability performance of the system. It is shown that with the proposed approach, a significant reduction in feedback load processing is achieved, with only a slight loss in performance. Copyright © 2016 John Wiley & Sons, Ltd.     

Integrated Train Ground Radio Communication System Based TD-LTE

In existing metro systems, the train ground radio communication system for different applications are deployed independently. Investing and constructing the communication infrastructures repeatedly wastes substan-tial social resources, and it brings di?culties to maintain all these infrastructures. We present the communication Quality of service (QoS) requirement for different train ground radio applications. An integrated TD-LTE based train ground radio communication system for the metro system (LTE-M) is designed next. In order to test the LTE-M system performance, an indoor testing environment is set up. The channel simulator and programmable attenua-tors are used to simulate the real metro environment. Ex-tensive test results show that the designed LTE-M system performance satisfies metro communication requirements.     

浅谈变电设备在线监测技术与状态检修

在电力系统自动化建设过程中,我国对电能的稳定性提出了更多、更高的要求.在电力系统中,变压器是非常重要机制设备,我国电力系统提出了越来越高的要求.电力系统要想保持可持续发展,必须采用智能化故障诊断方法和在线监测技术.通过运用变电设备在线监测技术与状态检修,能够使变电设备运行状态变得更为稳定和安全,有助于变电设备应用时间的延长,提高变电设备的工作效率.因此,本文对变电设备在线监测技术与状态检修进行研究,具有重要意义.     

Enhancement of Thermopower of TAGS‐85 High‐Performance Thermoelectric Material by Doping with the Rare Earth Dy

Enhancement of thermopower is achieved by doping the narrow‐band semiconductor Ag_6.52Sb_6.52Ge_36.96Te₅₀ (acronym TAGS‐85), one of the best p‐type thermoelectric materials, with 1 or 2% of the rare earth dysprosium (Dy). Evidence for the incorporation of Dy into the lattice is provided by X‐ray diffraction and increased orientation‐dependent local fields detected by ¹²⁵Te NMR spectroscopy. Since Dy has a stable electronic configuration, the enhancement cannot be attributed to 4f‐electron states formed near the Fermi level. It is likely that the enhancement is due to a small reduction in the carrier concentration, detected by ¹²⁵Te NMR spectroscopy, but mostly due to energy filtering of the carriers by potential barriers formed in the lattice by Dy, which has large both atomic size and localized magnetic moment. The interplay between the thermopower, the electrical resistivity, and the thermal conductivity of TAGS‐85 doped with Dy results in an enhancement of the power factor (PF) and the thermoelectric figure of merit (ZT) at 730 K, from PF = 28 μW cm^?1 K^?2 and ZT ≤ 1.3 in TAGS‐85 to PF = 35 μW cm^?1 K^?2 and ZT ≥ 1.5 in TAGS‐85 doped with 1 or 2% Dy for Ge. This makes TAGS‐85 doped with Dy a promising material for thermoelectric power generation.     

Feature Detection and Simplification of 3D Face Data with Facial Expressions

We propose an efficient framework to realistically render 3D faces with a reduced set of points. First, a robust active appearance model is presented to detect facial features in the projected faces under different illumination conditions. Then, an adaptive simplification of 3D faces is proposed to reduce the number of points, yet preserve the detected facial features. Finally, the point model is rendered directly, without such additional processing as parameterization of skin texture. This fully automatic framework is very effective in rendering massive facial data on mobile devices.     

一种基于C/S结构的跨平台通信处理机制

基于C/S结构的应用系统客户端和服务端之间的通信处理机制是C/S结构应用系统的重要组成部分.一直以来对于兼顾高速的服务端、友好的用户界面和跨平台的通信没有一个完美的解决方案.为了平衡这一矛盾,本文提出了一种新的通信处理机制.该机制使用不同的编程语言(C 和Java)制作客户端和服务端,采用自定义标注语言和XML相结合的纯字符流进行通信.较好地解决了基于C/S结构的应用系统跨平台跨编程语言快速通信处理的问题.实验结果表明该机制能有效地解决C/S结构应用系统跨平台的通信处理问题.     

CoFe涂层对非晶薄带GMI效应的影响

上制备不同厚度的CoFe薄膜层,观察其巨磁阻抗(GMI)效应在120 kHz~3 MHz频率范围内随外加磁场的变化。实验结果显示,在Co基非晶薄带上涂覆CoFe薄膜,可提高薄带的GMI效应。研究发现,当趋肤效应显著时材料表面粗糙度对GMI效应有较大影响。通过在Co基非晶薄带表面镀膜的方式降低样品表面粗糙度,减小表面退磁场的影响,并闭合样品磁通回路,从而提高样品GMI效应。     

带浅沟槽隔离的双光电二极管电路模型研究

通过器件模拟并结合实验结果,在已有PIN(Positive intrinsic negative)和DPD(Double photo-diodes)探测器电路模型基础之上,对带浅沟槽隔离(STI)准PIN结构的DPD探测器电路模型进行了探讨。模拟了由深N阱和浅沟槽给DPD带来的性能上的改变,同时结合实验结果,从响应电流和探测器的等效串联电阻两方面对电路模型进行了修正,得到了符合该器件的较准确电路模型。     

基于民用机会发射无源雷达目标定位技术

介绍一种基于民用机会发射无源雷达定位跟踪算法,用一批时间差(距离和)、多普勒频移和目标回波到达方向(DOA)数据,通过非线性参数估计法对目标进行定位跟踪,经过仿真验证,此方法能够提高定位精度。