基于BACnet/XML的BACnet/WS集成模型的设计与实现

本文基于BACnet/XML协议和BACnet/WS接口标准,提出了一种全新的智能楼宇集成模型,设计和实现了集成模型中的核心BACnet/WS服务组件,通过理论分析和仿真测试验证了集成模型具有良好的系统性能,从而较好地解决了智能楼宇领域中的这一难题.     

微型金属复合杜瓦瓶漏热测试系统的设计

杜瓦瓶是红外探测器的核心组件,其质量会直接影响整个热成像系统的可靠性。为了能更好地检测杜瓦瓶的真空特性,本文设计了一套用来测试杜瓦瓶液氮保持时间的设备,通过测试器件开路电压、液氮挥发等参数确定杜瓦器件真空的性能变化。本文对杜瓦瓶漏热进行了理论计算,并且进行了大量实验。根据实验数据与理论计算的比较可以看到,该设备具有较好的测量精度,达到了预期的设计目标。     

极化干涉合成孔径雷达图像信息提取技术的进展及未来

作为雷达成像遥感一个崭新的研究领域,上世纪90年代末出现的极化干涉合成孔径雷达信息提取技术已日益引起广泛的关注,在未来若干年内必将成为遥感领域的一个趋势和研究热点。该文对目前国内外该技术的进展现状及其应用领域进行了全面的阐述和分析,并在此基础上对该技术的未来发展进行了预测。     

图像DVI输出的FPGA实现

提出了一种专用图像处理卡中的图像输出子系统的设计方法，详细描述了设计流程和思考方式。他采用双握手机制、精度计数器，多频率锁相环等技术在FPGA(EP1S10)中实现了通用DVI控制模块，并通过DVI转换芯片SII164实现多格式DVI图像输出，其输出符合DVI协议和VESA通用时间公式。通过对参数的调整该子系统能很好地完成非标准图像处理领域中对特殊格式输出的需要。同时从VESA通用时间公式出发，讨论了参数的计算公式，给出了标准的计算方法。     

Efficient Online Algorithms for Dynamic Shared Path Protection in WDM Optical Networks

In this work, we have proposed and studied efficient online algorithms for shared path protection under dynamic traffic conditions in survivable WDM optical mesh networks. Given a connection request, routing and wavelength assignment of a working path and a protection path for the request is formulated as two integer linear programs based on shared and dedicated path protection, respectively. The objective is to minimize the total cost of additional resources used by the working path as well as the protection path to accommodate a new connection request. We then devise two resource efficient online algorithms using pre-computed candidate routes. The first algorithm uses one candidate working path and one candidate protection path for each newly arrived connection request while the second algorithm may use multiple candidate working paths and/or multiple candidate protection paths. The selection of a pair of paths from candidate routes as well as the assignment of appropriate wavelengths to accommodate a connection request is then jointly considered to minimize the total cost of additional resources. The solutions to the ILP formulations serve as the baseline for evaluating the performance of the proposed algorithms. We have evaluated the effectiveness of the proposed online algorithms via extensive simulations in terms of the connection blocking probability and the revenue earnings improved over the dedicated path protection approach. Our simulations indicate that our proposed computationally efficient online algorithms are able to provide 100% restorability against single failures with a resource efficiency comparable to that of the optimal shared path protection. The results also show that a small increase in the number of candidate working paths or protection paths (from 1 to 3) provides better performance, but a further increase does not improve the performance significantly. Therefore, a proper balance can be struck to achieve both satisfactory performance and efficient computation.The work reported in this paper was supported in part by AFRL, the U.S. Department of Energy Early Career Award DE-FG02-03ER25580, and a DAGSI graduate scholarship. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the funding agencies.     

An inverse methodology for high-frequency RF coil design for MRI with de-emphasized B1 fields.

An inverse methodology for the design of biologically loaded radio-frequency (RF) coils for magnetic resonance imaging applications is described. Free space time-harmonic electromagnetic Green's functions and de-emphasized B1 target fields are used to calculate the current density on the coil cylinder. In theory, with the B1 field de-emphasized in the middle of the RF transverse plane, the calculated current distribution can generate an internal magnetic field that can reduce the central overemphasis effect caused by field/tissue interactions at high frequencies. The current distribution of a head coil operating at 4 T (170 MHz) is calculated using an inverse methodology with de-emphasized B1 target fields. An in-house finite-difference time-domain routine is employed to evaluate B1 field and signal intensity inside a homogenous cylindrical phantom and then a complete human head model. A comparison with a conventional RF birdcage coil is carried out and demonstrates that this method can help in decreasing the normal bright region caused by field/tissue interactions in head images at 170 MHz and higher field strengths.     

合同能源管理公司引入PMP项目管理模式的探讨

随着节能减排在全国各行业的进一步推进,合同能源管理作为一种全新的节能模式引起重点关注,合同能源管理项目也迅速增多.针对合同能源管理项目的运作模式和特点,合同能源管理公司需要建立一套适应的项目管理模式来进行系统全面高效的项目管理,以提高项目成功的机率.文中针对上述需求,探讨引入PMP项目管理模式.     

LTE-Advanced异构网络中负载均衡研究进展及展望

新一代移动通信网络不断演进为高密集、无定型的异构网络,业务需求与资源供给的匹配问题,即负载均衡问题是异构网络(heterogeneous network,HetNet)资源管理的挑战问题之一.阐述了负载均衡的一般性问题,根据负载均衡算法的主要特征给出了综合分类,按照分类对近年来提出的主要负载均衡策略进行了细致和深入的对比分析;同时也对比分析了几种减少负载均衡过程中信令开销的方案.在总结现有研究成果的基础上,进一步分析负载均衡技术的最新发展趋势,为下一步的研究提出了新的问题和思路.     

Java平台测试策略

本文基于Java卡测试库平台TCK工具,对Java卡测试的关键技术进行了深入分析和研究,提供了拓展Java卡测试案例的一种具体实现.本文详细描述了Java卡测试平台运行的系统架构及工作流程,进行了深入的分析,并讨论了为提高Java卡测试案例的全面性和灵活性所采取的策略.实践结果表明,该测试案例拓展方法可高效灵活地提高Java卡平台测试的质量.     

QoS技术在IP网络中的部署策略简介

本文以某运营商的IP网络为例详细介绍了QoS设计方案.