图像可压缩性的随机场模型

将图像及其位平面分别用Potts模型和Ising模型刻画，通过估计相应的参数及计算Ising模型的熵率，得到了图像可压缩性的一种度量，对一些典型灰度图像的数值实验显示，这一度量能够较好地刻画图像可压缩性，并发现了自然图像的一些共同特点，将有失真压缩和无失真压缩情形进行了对比，得到了一些有意义的结果，该方法同样可以用来研究彩色图像，活动图像的可压缩性。     

SER analysis and power allocation for hybrid cooperative transmission system

The symbol-error-rate(SER) and power allocation for hybrid cooperative(HC) transmission system are investigated.Closed-form SER expression is derived by using the moment generating function(MGF)-based approach.However,the resultant SER contains an MGF of the harmonic mean of two independent random variables(RVs),which is not tractable in SER analysis.We present a simple MGF expression of the harmonic mean of two independent RVs which avoids the hypergeometric functions used commonly in previous studies.Using the simple MGF,closed-form SER for HC system with M-ary phase shift keying(M-PSK) signals is provided.Further,an approximation as well as an upper bound of the SER is presented.It is shown that the SER approximation is asymptotically tight.Based on the tight SER approximation,the power allocation of the HC system is investigated.It is shown that the optimal power allocation does not depend on the fading parameters of the source-destination(SD) channel and it only depends on the source-relay(SR) and relay-destination(RD) channels.Moreover,the performance gain of the power allocation depends on the ratio of the channel quality between RD and SR.With the increase of this ratio,more performance gain can be acquired.     

A 65-nm 1-Gb NOR floating-gate flash memory with less than 50-ns access time

This paper presents a 65-nm 1-Gb NOR-type floating-gate flash memory, in which the cell device and chip circuit are developed and optimized. In order to solve the speed problem of giga-level NOR flash in the deep submicron process, the models of long bit-line and word-line are first given, by which the capacitive and resistive loads could be estimated. Based on that, the read path and key modules are optimized to enhance the chip access property and reliability. With the measurement results, the flash memory cell presents good endurance and retention properties, and the macro is operated with 1-las/byte program speed and less than 50-ns read time under 3.3 V supply.     

以苏南为例谈发达地区农业的空间经济转换机制与调控

以苏南为分析单元，探讨在工业化、城市化的大背景下，发达地区在多元化的农村剧变中，由于城乡相互作用及区际分工格局的变动导致的农业空间经济转换的过程及其动力机制，并提出调控的方向．     

硬盘数据存储格式与系统区域的备份

该文详细描述了计算机硬盘数据存储格式，并提供了实用的系统区域的备份及恢复的程序。     

Protandric simultaneous hermaphroditism and sex ratio in Lysmata nayaritensis Wicksten, 2000 (Decapoda: Caridea)

Caridean shrimps display a wide variety of sexual systems, including the newly discovered protandric simultaneous hermaphroditism. Protandric simultaneous hermaphroditism is known only from seven species of Lysmata, and it is not clear if this condition is fixed within the genus or if Lysmata includes species that are simply protandric or gonochoric (with separate sexes). This study uses anatomical data, aquarium experiments, and field observations to demonstrate that Lysmata nayaritensis is another protandric simultaneous hermaphrodite. It is shown that, despite occurring in the tropics, this species fits into the “crowd” species category, with high densities in the field and that the field sex ratio is highly male‐biased. Information on the sex allocation and sexual system of more species needs to be examined before these observations can be put into a comparative context within the genus.     

新型电脑横机主要控制机构设计分析

根据在开发设计电脑横机中所积累的经验,分析新一代电脑提花针织横机几个主要控制机构,对其中的针床横移机构以及齿口片结构设计做了重点的介绍     

言语输出中的话语修正与外语教学

任务型教学研究认为不同的言语输出任务能为学习者提供不同的机会,帮助他们训练不同的语言层面,从而促进习得。这类研究的一个备受关注的方面就是注意力与任务要求之间的关系。本研究对中国学生学英语最常见的三种输出任务即复述、即席讲话和会话进行研究,根据话语修正类型的分布情况来了解三种任务中学习者的注意力分配,尤其是对语言准确性的注意力分配。     

基于UWB技术的Ad Hoc网络的资源分配

研究了基于超宽带（Ultra Wide Band,UWB）无线Ad Hoc网络的资源分配问题,以速率的成比公平性原则和效用函数最大化为依据,讨论了功率及速率的分配对网络性能的影响.通过求解效用最大化的问题,得到了一组数值解,并对其进行了仿真.试验结果表明,该模型能够在节点的公平性和网络的吞吐量之间获得良好的折中.     

分布式关系型数据库管理系统C-POREL的代码生成机制设计

分布式数据库管理系统(DDBMS)中,代码生成模块是实现系统的分布透明性(分割透明性和分配透明性)的重要模块,其设计得好坏对整个系统有极大的影响。本文以分布式关系型数据库管理系统C-POREL的代码生成机制为例,讨论DDBMS中的代码生成层的设计方法。文中给出C-POREL系统的代码生成模块的设计方案,并提出了其中所必须的一些算法,最后给出了具体的例子。