移动环境下一种缓存管理策略

移动计算环境中带宽具有非对称性,并且移动设备资源有限,传统的缓存管理策略需要占用大量的设备计算资源和网络带宽,有效的缓存管理技术能够极大提高移动计算的性能。对此提出一系列的针对移动计算的缓存管理策略。首先根据用户访问频率建立对应的具有生命周期的数据项缓存,然后使用自适应一致性维护策略维护缓存的一致性。通过实验分析,提出的管理策略能够很好地降低带宽占用,并且有效地减少对移动客户端的资源需求。     

Separation of stearox-6 from aqueous media by the use of hollow-fiber ultrafilters

Conclusions -- The fundamental possibility of effective separation of Stearox-6 from waste water in the manufacture of viscose fiber by the use of hollow-fiber ultrafilters has been demonstrated.Translated from Khimicheskie Volokna, No. 2, pp. 41–43, March–April, 1993.     

一种道路车辆监控视频中的关键帧提取方法

针对道路监控视频中特定车辆图像序列的关键帧提取问题,在运动对象检测的基础上,提出一种关键帧提取方法。将积分通道特征和面积特征作为图像特征描述子,结合Ada Boost训练分类器,实现道路监控视频车辆序列图像中关键帧的提取。通过运动对象前景检测技术获得出现在监控区域的运动车辆最小外接矩形图像序列,选择满足监控分析需求(车牌清晰度高,能判断车型)的若干帧作为正样本,其他不满足监控分析需求的作为负样本,提取样本图像的面积特征和积分通道特征,利用Ada Boost方法训练得到一个分类器,使用Ada Boost分类器对测试样本进行分类,根据打分规则提取关键帧。实验结果表明,该方法能提取运动车辆从进入到离开监控区域的序列图像帧中最清晰的图像,实现道路车辆监控视频分析数据的有效压缩。     

Integrated clinical pathway management for medical quality improvement – based on a semiotically inspired systems architecture

Clinical pathway is an approach to standardise care processes to support the implementations of clinical guidelines and protocols. It is designed to support the management of treatment processes including clinical and non-clinical activities, resources and also financial aspects. It provides detailed guidance for each stage in the management of a patient with the aim of improving the continuity and coordination of care across different disciplines and sectors. However, in the practical treatment process, the lack of knowledge sharing and information accuracy of paper-based clinical pathways burden health-care staff with a large amount of paper work. This will often result in medical errors, inefficient treatment process and thus poor quality medical services. This paper first presents a theoretical underpinning and a co-design research methodology for integrated pathway management by drawing input from organisational semiotics. An approach to integrated clinical pathway management is then proposed, which aims to embed pathway knowledge into treatment processes and existing hospital information systems. The capability of this approach has been demonstrated through the case study in one of the largest hospitals in China. The outcome reveals that medical quality can be improved significantly by the classified clinical pathway knowledge and seamless integration with hospital information systems.     

BitTorrent网络节点间流量的数据采集和分析

BitTorrent网络流量占据了互联网总流量的很大比例,吸引了大量专家学者的专注,然而现有实测工具无法实时记录BT网络中节点间的流量交互情况,有关真实BT网络中节点间流量的研究很少。建立了一个BT网络节点间流量的数据采集系统,将其部署在全球性实验平台Planetlab之后得到了真实数据,并验证了数据的正确性。通过对实测数据的分析和研究发现:(1)Tracker服务器在为各下载节点随机返回邻居节点列表时会受到各节点入网时间的影响;(2)50%以上的下载节点从种子处下载的数据为零,大部分下载节点的数据下载对种子的依赖性不大,从而深刻地体现出P2P应用模式的优越性。     

SSI:一种IPv6/IPv4多址同源识别模型

IPv6/IPv4共存环境下多址同源识别是共存网络管理与拓扑发现的一个关键问题。现有研究主要集中于子网内部的双栈发现及单一IP协议栈中的别名解析,难以识别远程IPv6/IPv4共存网络中的多址同源。通过分析同源地址间的本质联系,提出一种IPv6/IPv4多址同源识别模型(SSI),该模型综合利用特殊地址格式匹配、TCP时钟指纹比对和上层协议短时致瘫等多种方式来提高同源地址的识别能力。实验结果表明,上述方法均可有效识别IPv6/IPv4多址同源;SSI模型具有较理想的识别率和正确率。     

Self-Propagating High-Temperature Synthesis of Cerium Chromite Substituted with Alkaline-Earth Metals

Cerium chromites, non-substituted and substituted with alkali-earth metals, are synthesized in the self-propagating high-temperature synthesis mode using solid interaction oxidizes. The characteristic temperatures and specifics of interaction between the components are determined for all systems considered. The structural and physicochemical parameters, including the spectroscopic characteristics of the synthesis products depending on the alkaline-earth metal substituent and the degree of substitution, are investigated.     

Development of waste-free technology for freeing exhaust air from man-made fibre plants from hydrogen sulfide

Conclusions Devising waste-free technology for the process of cleaning up exhaust air from man-made fibre plants from hydrogen sulfide is tied in with the development of methods for utilization of the main oxidation products of the absorbed hydrogen sulfide — finely dispersed sulfur and sodium thiosulfate.A process for the preparation of an acarofungicide based on finely divided sulfur has been developed and realized in industry; this is a valuable product which is needed to fulfill the the goals of the Food Program. A process has been developed for the preparation of sodium thiosulfate from absorber solutions in the alkaline-catalytic method of freeing exhaust gases from hydrogen sulfide.Translated from Khimicheskie Volokna, No. 6, pp. 12–14, November–December, 1984.