新疆春大麦幼穗分化进程与形态指标的诊断

本文根据多年对二棱、四棱、六棱春大麦七个品种的大田观察和小区试验,论述了有关新疆春大麦幼穗分化进程与形态指标的诊断,指出不同类型品种,其幼穗分化进程与叶龄和节间伸长等一些共同规律.     

A－NET机router间通信过程的模拟

在介绍了Ａ－ＮＥＴ计算机的ｒｏｕｔｅｒ部分的功能之后，主要叙述了利用ＵＮＩＸ进程管理和进程通信的功能对ｒｏｕｔｅｒ间通信过程的模拟。     

基于Dexter的协同超媒体系统设计

论述了基于Ｄｅｘｔｅｒ超文本标准模型的协同超媒体系统的通用体系结构设计中的问题。该结构包括开发与Ｄｅｘｔｅｒ兼容的超媒体系统的通用框架。其中的编辑进程、客户进程和ＯＯＤＢ服务器进程分别对应于Ｄｅｘｔｅｒ模型的各个层。ＯＯＤＢ提供了灵活的锁定和通告机制，这些机制使得ＯＯＤＢ更为通用且可独立于基于Ｄｅｘｔｅｒ的进程和数据模型而有所变化和扩展。文章最后给出了一些协同系统使用的典型例子。     

Simultaneous Multithreading Fau Tolerance Processor

Transient fault detection mechanism is added to simultaneous muhithreading architecture. By exploiting both ILP (Instruction l~evel Parallelism) and TLP (Thread Level Parallelism), Simultaneous Multithreading(SMT) Fault Tolerance Processor can be expected to achieve better tradeoff between performance and hardware cost than traditional Fault Tolerance Processors. Detailed simulations of 3 of SPEC95 benchmarks show that executing two redundant programs on the fault-tolerant microarchitecture takes only 40%-61% longer than running a single version of the program. The new instruction fetch algorithm enhances the performance by 0. 4%～1% to most of the benchmarks we choose randomly.     

Research on Fault Tolerant Scheduling Algorithms of Web Cluster Based on Probability

Aiming at the soft real time fault tolerant demand of critical web applications at present, such as E-commerce, a new fault tolerant scheduling algorithm based on probability is proposed. ““““““““Ib achieve fault tolerant scheduling, the primary/slave backup technology is applied on the basis of task‘s self similar accessing characteristics, when the primary task completed successfully, the resources allocated for the slave task are reclaimed, thus advancing system‘s efficiency. Experimental results demonstrate on the premise of satisfying system‘s certain fault tolerant probability, task‘s schedulabilistic probability is improved, especially, the higher task‘s self similar degree is, the more obviously the utilization of system resources is enhanced.     

Reliability Analysis of Sensor Networks

To Integrate the capacity of sensing, communication, computing, and actuating, one of the compelling technological advances of these years has been the appearance of distributed wireless sensor network （DSN） for information gathering tasks. In order to save the energy, multi-hop routing between the sensor nodes and the sink node is necessary because of limited resource. In addition, the unpredictable conditional factors make the sensor nodes unreliable. In this paper, the reliability of routing designed for sensor network and some dependability issues of DSN, such as MTTF （mean time to failure） and the probability of connectivity between the sensor nodes and the sink node are analyzed. Unfortunately, we could not obtain the accurate result for the arbitrary network topology, which is # P-hard problem. And the reliability analysis of restricted topologies clustering-based is given. The method proposed in this paper will show us a constructive idea about how to place energyconstrained sensor nodes in the network efficiently from the prospective of reliability.     

基于多线程技术下的数据库查询

详细介绍了多线程编程的关键技术,并运用该技术对数据库进行查询的实现方法和解决多线程并发同 步问题,并且通过实例对比了用户交互过程中单线程与多线程下的数据库操作性能,给出了Delphi环境下对 SQLServer数据库的多线程操作实例．     

基于实时分布式计算机系统的容错技术研究

目的为研制适应第四代飞机高度综合化、模块化、高可靠性的航空电子系统的计算平台。方法提出了分层容错管理策略。结果由系统、分系统和模块构成三级容错管理策略;由故障监控程序负责故障的监控和确认,并将确认的故障交由故障管理程序处理;由故障管理程序根据蓝图定义完成重构;重构通过逻辑功能到物理资源的不同映射方式实现;给出了这些过程的实例。结论容错功能的实现必须以保证强实时系统的确定性为前提。     

基于UNIX的消息缓冲通信机制设计与实现

介绍了UNIX进程通信的基本概念和原理,在此基础上,针对消息缓冲通信机制进行详细的阐述,并给出了具体的实现方法和实例分析.     

论文化传统对美国高等教育大众化进程的影响

文化系统因素对美国高等教育大众化进程具有重要影响.建立在基督教文化、共和文化和个人主义文化基础上,崇尚自由、民主、平等和个性生成的实用主义是美国文化传统的主要特点.实用主义文化传统影响着美国高等教育大众化进程中的高等教育观、课程改革以及高等教育多样化特点的形成.