FPGA／CPLD可编程逻辑器件的在系统配置方法

讨论了基于SRAM技术的CPLD／FPCA可编程逻辑器件的编程方法，并以ALTERA公司FLEX10系列器件为例，提出了一种利用微处理器对可编程逻辑器件进行在系统多方案配置的实用方法。该方法成本低廉、简单易行，能在系统复位或上电时自动对器件编程，不仅有效的解决了基于SRAM的CPLD／FPGA器件掉电易失性的问题，而且使单一芯片可以具有多种逻辑功能，实现了该类器件逻辑功能的在系统多方案的灵活配置。     

髋臼骨折的CT诊断价值(附89例分析)

目的：评价CT在髋臼骨折中的诊断价值。方法：回顾分析89例髋臼骨折的CT检查并与X线平片相比较。结果：CT检查在髋臼骨折分型诊断、关节腔内游离碎骨片等方面优于X线平片。结论：CT是全面评价髋臼骨折的必要手段，其总体效能优于X线平片。     

Classification of Medical Brain Images

Since brain tumors endanger people‘s living quality and even their lives, the accuracy of classification becomes more important. Conventional classifying techniques are used to deal with thosedatasets with characters and numbers. It is difficult, however, to apply them to datasets that include brain images and medical history (alphanumeric data), especially to guarantee the accuracy.For these datasets, this paper combines the knowledge of medical field and improves the traditional decision tree. The new classification algorithm with the direction of the medical knowledge not only adds the interaction with the doctors, but also enhances the quality of classification. The algorithm has been used on real brain CT images and a precious rule has been gained from the experiments. This oaoer shows that the ahzorithm works well for real CT data.     

Matched field noise suppression： Principle with application to towed hydrophone line array

Discrete noise source suppression in underwater acoustic channel has attracted great attention in recent years. The paper proposes a new principle for dealing with the problem. This new principle is called matched field noise suppression (MFNS). Based on a previous work of the authors group, a full understanding about how a discrete noise source shows effects on the performance of a towed hydrophone line array has been obtained. In light of that finding,MFNS is proposed, which explores and utilizes the characteristics of the noise transmission channel to achieve much greater suppression of the noise in comparison with existing approaches. MFNS combines the concept of matched field processing (MFP) and optimal sensor array processing (OSAP) together to suppress the discrete noise source and to maintain an optimal beam for receiving far-field wanted plane wave signals. A MFNS beam-former is deduced in constraint with signal plane-wave response being unit and noise matched field response being zero. A dosed-form solution of the weight vector for the beam-former is given. Computer simulation results agree well to the theoretical analysis.     

南海海底特征、资源区位与疆界断续线

根据南海海底的成因与地形特征 ,并通过建立和分析南海海底数字地形模型 ,将南海的海底分为中央的深海盆地、两侧的阶梯状大陆坡、以及周边亚洲大陆延伸的大陆架 3个地貌单元 .再据 194 7年“南海诸岛位置图”精确计算出二战后依据波茨坦公告为国际认可的断续线疆界的经纬度坐标 ,阐述了中国对南海主权的历史延续性 .最后 ,论述了南海区位与资源的优势 ,论证了其海域具体位置与巨大的经济政治战略意义 .     

基于小波分析的X线医学图像噪声综合抑制方法

提出了一种基于小波分析理论的医学X线图像噪声的综合抑制方法．将X线图像的试验处理结果与邻域平均、中值滤波去噪处理方法进行对比分析，结果表明该方法不仅能消除噪声提高图像质量，而且有效地保留了影像中丰富的细微影纹和边缘信息．     

X线头影测量分析自动化系统研究

在Windows98的基础上，采用面向对象的方法进行分析，以Visual Basic6.0编制全部程序，建成了定点测量分程全程自动化的头影测量分析系统．利用本系统实现了对头颅定位侧位片上标志点的自动定位．系统具有人机界面友好，操作简单，功能实用，易于升级等特点．     

校园网多链路接入Internet的设计与实现

校园网的出口是网络规划和建设中需要重点考虑的问题,它关系到校园网用户对Internet访问的速度,本文就校园网的多链路接入方法进行了分析,并针对CISCO6509路由器给出了解决数据分流,地址转换,访问控制的具体实现.     

用保角变换-边界配点求应力强度因子的计算方法研究

介绍了用保角变换-边界配点法求解有限平面域内部孔口问题的基本方程．以中心裂纹矩形板为例，研究了计算方法中各种因素对应力强度因子形状尺寸系数YI计算结果的影响规律，得到了保角变换-边界配点法的合理计算方案，给出了有关因素对应力强度因子计算结果影响规律的数值图表和曲线．     

一种新型循环冗余码校验算法的研究

为了满足串行通信中差错控制的实时性与低存储量要求，在字节查表的循环冗余码校验算法基础上，提出一种新的分段查表的循环冗余码校验算法。新算法的核心是将数据帧的每个字节分为高、低两段分别查表，再通过递推运算，求得数据帧的循环冗余码。测试结果表明，在满足实时性要求的同时，该算法所需要的存储量可以减少90％，能适应分布式控制系统中小型控制设备的串行通信的需要。