三要素法在求任意信号作用下的系统响应中的应用

对于任意信号作用下的系统响应，本文提出利用三要素法求其阶跃响应和零输入响应，再利用卷积，即可求出。此法同以往的各种方法相比，更简便、易行。     

球形触点阵列与四边扁平封装的比较

球形触点阵列（ＢＧＡ）封装技术作为一种新的封装技术越来越受到人们的重视。从安装率和成本、表面安装印制板设计以及焊点可靠性三个方面对球形触点阵列与四边扁平封装（ＱＦＰ）进行了比较。分析认为，ＢＧＡ和ＱＦＰ各有其优势和劣势，各有其应用重点。     

ON MARKOV RANDOM FIELD MODELS FOR SEGMENTATION OF NOISY IMAGES

Markov random field(MRF) models for segmentation of noisy images are discussed. According to the maximum a posteriori criterion, a configuration of an image field is regarded as an optimal estimate of the original scene when its energy is minimized. However, the minimum energy configuration does not correspond to the scene on edges of a given image, which results in errors of segmentation. Improvements of the model are made and a relaxation algorithm based on the improved model is presented using the edge information obtained by a coarse-to-fine procedure. Some examples are presented to illustrate the applicability of the algorithm to segmentation of noisy images.     

RAPID CODEBOOK SEARCH ALGORITHM FOR SAR RAW DATA COMPRESSION

This paper presents a simple but eifective algorithm to speed up the codebook search in a vector quantization scheme of SAR raw data when a minimum square error(MSE) criterion is used. A considerable reduction in the number of operations is achieved.     

平坦响应空域滤波器和在DOA估计中的应用

本文依据半无穷维二次优化技术提出了一个设计平坦响应空域滤波器（ＳＦ）的新方法，基本思想是使用线性泛函不等式约束夺感兴趣的空域范围内保证ＳＦ响应的平坦性，同时使输出噪声功率最小化，由于使用了硬的线性泛函约束，ＳＦ响应总可以控制在充许的误差范围之内，最后研究了基于平坦响应的信号到达方向（ＤＯＡ）估计问题，计算机模拟结果和分析表明本文提出的基于平坦响应ＳＦ的ＤＯＡ估计性能优于其它有关方法的估计性能。     

基于IFS分形理论的信源编码技术的研究

本文首次系统地研究了基于ＩＦＳ分形理论的信源压缩编码与传统方法的关系。     

Object boundary location by region and contour deformation

Many applications in image analysis need to distinguish an object from its surroundings. The `snake' method (Kass, 1987) is a well known method to solve such problems by locating the object boundary from an initial plan, but it has the limitation that the distance between the initial plan and the object boundary should be `very small'. The authors present a two-step method, which combines region and contour deformation, to locate the boundary of an object from a designated initial boundary plan. First, they propose a new deformable region model to represent an object, and use the model to locate the boundary of the object by region deformation. This step fills the gap between a fairly rough initial plan and the `snake' method. The resulting boundary is then used as the initial plan of a `snake' method to further refine the boundary. The results of the method are shown in simulated images and MRI images of brain tumour patients     

分形方法用于有噪图像边缘检测的研究

本文研究了加性高斯白噪声对于基于离散分数布朗随机场模型图像分形维数估计的影响，并将分形方法用于图像边缘检测，指出在加性高斯白噪声的情况下，分形方法用于图像边缘检测较之经典的基于梯度运算的边缘检测方法有好的抗噪性能，同时又能检测比较丰富的图像边缘细节。     

基于巴特沃斯逼近的二维IIR数字滤波器的设计

本文给出了一种基于巴特沃斯逼近的二维ＩＩＲ数字滤波器的设计方法，得到了由基本的全通节级联，并联实现的各种二维滤波器函数，包括，镜象对称互补滤波器，扇形滤波器和具有任意矩形通、阻带的滤波器，结果表明，这种实现结构具有通有灵敏度低、滤波器系数少的优点，并且由于巴特沃斯逼近的最大平坦性，得到的滤波器具有良好的相位特性。     

添加碳对BaTiO_3 PTC陶瓷之影响

在ＢａＴｉＯ_３ＰＴＣ粉体中添加碳粉，可制成多孔性的陶瓷材料，同时对材料的ＰＴＣ特性及批量生产的重现性有明显改进。