线性联合检测算法在TD-SCDMA系统中的性能分析与比较

时分、同步码分多址（TD－SCDMA）系统是基于时分双工（TDD）的块传输系统，它使用了联合检测这项关键技术来抵抗符号间干扰（ISI）和多址干扰（MAI）。以上行链路为例，本文分析了三种线性联合检测算法－－匹配滤波块均衡器（MF－BLE）、迫零块均衡器（ZF－BLE）和最小均方误差块均衡器（MMSE－BLE）。从理论上，我们描述了这三种线性联合检测算法的基本原理，并对它们进行了比较（包括抗干扰性能和计算量）。随后，我们模拟了不同参数条件下（信道模型、码道数目、天线数目）这几种算法的性能，并与理论分析进行对照，得出一定结论。     

On the design of multiple key hashing files for concurrent orthogonal range retrieval between two disks

This paper concerns the following problem: given a set of multi-attribute records, a fixed number of buckets and a two-disk system, arrange the records into the buckets and then store the buckets between the disks in such a way that, over all possible orthogonal range queries (ORQs), the disk access concurrency is maximized. We shall adopt the multiple key hashing (MKH) method for arranging records into buckets and use the disk modulo (DM) allocation method for storing buckets onto disks. Since the DM allocation method has been shown to be superior to any other allocation methods for allocating an MKH file onto a two-disk system for answering ORQs, the real issue is knowing how to determine an optimal way for organizing the records into buckets based upon the MKH concept.

A performance formula that can be used to evaluate the average response time, over all possible ORQs, of an MKH file in a two-disk system using the DM allocation method is first presented. Based upon this formula, it is shown that our design problem is related to a notoriously difficult problem, namely the Prime Number Problem. Then a performance lower bound and an efficient algorithm for designing optimal MKH files in certain cases are presented. It is pointed out that in some cases the optimal MKH file for ORQs in a two-disk system using the DM allocation method is identical to the optimal MKH file for ORQs in a single-disk system and the optimal average response time in a two-disk system is slightly greater than one half of that in a single-disk system.     

2300mm三辊中板轧机的加宽改造及维修性设计

本文就三辊轧机的改造要点及“维修性设计”在三辊轧机改造中的应用做了技术分析和论述。     

PCF的信息系统模型

带类型的λ－演算是一个逻辑系统，它可以作为程序语言的基础．Ｐｌｏｔｋｉｎ所引进的ＰＣＦ就是这样一类程序语言．Ｐｌｏｔｋｉｎ构造了ＰＣＦ的一个模型，然后讨论与这个模型相关的指称语义和操作语义之间的配合问题──简单配合和完全配合．本文利用Ｓｃｏｔｔ引进的信息系统概念构造ＰＣＦ的另一种模型，并证明与这个模型对应的指称语义与操作语义是完全配合的．     

基于模糊匹配的平面连杆机构反求设计研究

对平面连杆机构曲线进行了分析,提出了用一组特征参数来描述连杆曲线,建立了连杆曲线图谱库,并将模糊论应用于连杆机构的曲线匹配,从而获取所求的机构参数.最后给出了应用实例,证实了该方法的可行性与有效性.     

开滦集团公司煤层间配采模型的建立

运用线性规划建立了数学模型，解决了开栾集团公司煤层间的配采问题，提高了煤炭企业的经济效益，有利于企业实现可持续发展。     

Interfacial energy and match of cold pressure welded Ag/Ni and Al/Cu

The technology of cold pressure welding was adopted to achieve the bonding of Al/Cu(limited soluble and forming compounds),Ag/Ni(hardly mutual soluble),and the relative state of interface was tested by HREM.The results indicate that stable interface is always corresponding to the low interfacial energy value;the stable interface is not coherent but partly-coherent because of the twisting of grain boundary caused by pressure,meanwhile existing dislocation.Namely,the interfacial match and other states under the condition of cold pressure welding are different from the situation that under the condition of thermal action.Moreover,theoretical analyses and calculation on the base of thermodynamics,crystallogeny ,solid physics etc,were discussed.     

牙科陶瓷配色方法和应用的初步研究

探讨牙科陶瓷配色的方法和机理，通过将钒锆黄、锆镨黄、锆铁红、铬铝锌红对牙科陶瓷进行配色。采用分光光度计测量了样品的L＊、a＊、b＊值和色差，并与VitaA2和ceramcoA2瓷粉对比，研究了样品色差与配方之间的关系。     

融合查询扩展和动态匹配的集外词检测

目前关键词检测面临的一个主要挑战是集外词问题。由于集外词发音的不确定性导致其检测性能与集内词相差很多。对此,本文提出了一种融合查询扩展和动态匹配的方法来改善集外词检测的性能。首先比较了基于联合多元模型的查询扩展和基于最小编辑距离的动态匹配。考虑到二者潜在的互补性,采用两种融合方法：一种方法是结果融合,分别应用查询扩展和动态匹配并行的检测集外词,然后合并检测结果;另一种是置信度融合,融合最小编辑距离和发音得分构成混合置信度进行集外词的检出与确认。实验结果表明,第二种融合方法的效果更好,系统的品质因数相对提升了19.8%。     

基于匹配策略融合的低误差快速图像拼接算法

针对目前多数拼接算法正确匹配率低、耗时及误差大的问题,提出了基于匹配策略融合的改进图像拼接算法。该算法首先仅在图像的重合区域提取SIFT特征点,并计算SURF特征描述符;其次,融合改进的最近邻比次近邻、双向交叉检查及匹配差值的阈值化3种匹配策略,结合坐标约束及RANSAC算法完成特征匹配;最后,提出利用配准参数计算任意图像到参考图像坐标空间的投影变换模型的方法,并利用多线程技术将所有图像投影至参考坐标系,经过亮度校正、加权融合后合成全景图。实验结果表明,提出的拼接算法正确匹配率提高了10~20%,拼接总耗时约为传统逐帧扩大式拼接算法的1/3,且累计误差大大降低,拼接图像畸变小。