电子信息系统中信息传输控制技术

信息传输控制技术是决定信息正确传输的关键,该文针对目前电子信息系统中信息传输的现状和特点,提出构件化网络传输控制服务软件的设计方法,采用相关信息传输控制技术,建立信息传输组件架构和传输控制机制应用于工程实践。结果证明,该技术设计解决了目前困扰信息传输的相关实际问题,在提高信息传输的灵活性、实时高效性和可靠性等方面取得了明显的效果。     

基于VCG机制的无线网络呼叫接入控制算法

提出一种基于VCG机制的无线网络呼叫接入控制（CAC）算法。该算法采用VCG机制调节用户需求,控制资源分配,以实现资源合理使用。CAC算法适合于无线接入网络中多业务服务、多优先级服务的情况。仿真结果表明,将VCG机制与CAC算法结合,能较好地改善无线网络性能,提高系统连接级的QoS。     

MANET环境下的TCP Veno性能研究

采用NS2对运行在MANET环境下的TCP Veno的性能进行仿真测试,仿真结果表明,在有背景流、随机丢包且存在拥塞的 MANET网络中,TCP Veno的性能优于TCP Reno,且背景流越大、达到拥塞的时间越短、随机丢包越大,TCP Veno的优越性就越明显。但2种协议的兼容性较差,导致数据包的重传率增大。     

无线传感器网络MAC协议的研究与分析

针对不同的传感器网络应用,研究人员从不同方面提出多个无线传感器网络介质访问控制（MAC）协议,其中包括S-MAC,PMAC,DEANA,EMACs,Z—MAC以及AIMRP等协议。通过分析各类MAC典型协议特点,归纳其设计原则和分类方法,比较各协议间的性能差异,结果证明无线传感器网络MAC协议呈现多样性的特点,设计MAC协议需要兼顾能量效能和网络性能2个方面。给出MAC协议的设计策略。     

基于XML与数据库技术的权限管理

在基于角色的访问控制（RBAC）模型的基础上,结合XML应用特性,对权限管理中的系统和用户权限信息分别应用XML和数据库技术,设计并实现了将XML与数据库技术相结合的Web应用系统的权限管理方法,提高了Web系统权限管理的灵活性和复用性,并在实际系统中验证成功。     

Learning about psychological professions with the world-wide web

Abstract Teaching with the world-wide web is becoming a common practice in modern education. The web serves two main interrelated functions, namely, retrieval and publication of information. To enhance learning and motivation, the student-as-teacher (SAT) principle was adopted in the study reported in this paper. Students were given the role of teacher of high school students and the general public about the subject matter they learned on a course. To achieve this goal, the students created educational web sites featuring two selected psychological professions. Being the major assignment for the course, the web sites created by students received higher scores than the assignments of their peers who learned the same materials through traditional pedagogical approaches. Course evaluation confirmed that the web implementation of the SAT principle enhanced learning, increased motivation and provided a transfer-able skill, without compromising accomplishment of major course goals.     

亭子口缆机运行效率提高的工作研究

根据缆机浇筑混凝土的工艺特性,将缆机浇筑混凝土过程中的车辆运输及缆机吊运程序进行作业流程分解,将缆机吊运作业周期划分为9个操作单元,采集缆机吊运混凝土过程中卸料和浇筑全周期各单元的50个工作样本数据进行统计分析,找出需改进的关键点,针对性地提出了6项改进措施.改进作业方案后缆机吊运混凝土的效率提高了约20％.     

Automatic parallelisation for LTI MIMO state space systems using FPGAs. An optimisation for cost & performance

The parallelism attained by the use of Field Programmable Gate Arrays (FPGAs) has shown remarkable potential for accelerating control systems applications. This comes at a time when well established methods based on inherited serial Central Processor Units (CPUs) cannot guarantee solutions for the increasing execution speed demands. However, the transition from serial to parallel architectures represents a tremendous challenge due to overwhelming numbers of unexplored options and conflicting factors. The work presented achieves a parallelisation characterisation for generic MIMO systems using stand-alone FPGA implementations. The main contribution is that a very fine subset of possible serial/parallel implementations is obtained. This is used to achieve a flexible trade-off between cost and performance. Automatic optimisation of latency, occupied FPGA area and execution speed is attained and justified in respect to most of the feasible scenarios.     

Recognition of words presented during general anaesthesia

Occasionally, patients report memories (‘awareness’) for events occurring during anaesthesia. The experience can be disturbing for both patient and anaesthetist. The present study confirms that anaesthetized patients can retain a weak memory for auditory information presented during the period when they were apparently unconscious. Patients who were played a ten-word stimulus list performed significantly better in subsequently correctly detecting those stimuli in a 40-word test list than did a control group who heard a tape of radio static. Retention was apparent only by the recognition test, indicating that reliance upon patients' spontaneous recall underestimates the potential for retention, and hence the frequency of awareness itself. The results support those who advocate the use of ear plugs or other devices to prevent patients from hearing, and perhaps remembering, disquieting information during surgery.