基于Visual Foxpro的用PC机实现前台交易功能的软件设计

以Visual Foxpro为开发环境，研究了在PC机上实现POS机前台交易功能的软件设计技巧，并给出了前台交易流程图和主要数据文件。该软件已成功用于餐饮、娱乐、超市、医药等领域的销售管理，取得了良好的经济效益与社会效益。     

基于POS数据的OMIS影像几何校正

介绍了基于POS数据对OMIS影像做几何校正的原理和方法,不同于传统使用地面控制点对影像的纠正,该方法不需要地面控制点,这显著地提高了航空摄影后处理的工作效率,具有良好的应用前景。该处理流程主要分为两个部分:利用POS数据计算影像外方位元素和建立共线方程对OMIS影像做几何校正。实验证明,该方法对摆扫型成像方式的几何畸变校正是可行的,校正结果满足使用要求。     

基于分类的汉语语料库词性标注一致性检查

制约语料库加工质量的一个重要方面是多标记词语的词性标注一致性问题。该文通过对大规模语料库兼类词的词性标注结果的分析,提出一种语料库词性标注一致性检查的方法,分析词性标记序列的特征并建立兼类词语境向量模型,运用k最近邻法,对兼类词语境进行向量分类,判定兼类词词性标注是否一致,得出每篇文章的词性标注的一致性情况,并测试了北京大学的150万语料。     

维吾尔语词法分析的有向图模型

维吾尔语是典型的黏着性语言,其派生能力很强,具有丰富的形态变化,同时遵循语音和谐规律,生成过程中会出现弱化、增音、脱落等音变现象.这些特性决定了维吾尔语词法分析的难点,包括词干提取、发生音变字母的还原以及标注.将维吾尔语词的层次结构引入到词法分析研究中,提出了维吾尔语词法分析的有向图模型,该模型将维吾尔语词法分析描述为有向图结构,图中节点表示词干、词缀及其相应标注,其边表示节点之间的转移或生成概率并将此概率作为候选择优的依据.针对维吾尔语在形态变化过程中发生的音变现象,又提出基于词内字母对齐算法的自动还原模型,该模型将音变现象泛化到每个字母上的假设之下,将还原问题转变成类似于词性标注问题,再利用统计方法进行还原.在对新疆多语种信息技术重点实验室手工标注的《维吾尔语百万词词法分析语料库》上进行的实验中,取得了词干提取正确率为94.7%,词干与各词缀切分并标注的F值达到92.6%的好成绩.     

宽带IP城域网组网技术及技术进展研究

介绍了宽带IP城域网组网技术，包括ATM技术、POS、千兆比以太网，DPT技术，分析和比较了上述技术的优缺点及实现方法，最后指出IP城域网组网技术的进展。     

物理层与链路层间接口转换逻辑的设计与实现

论述了物理层的IX BUS总线与链路层的POS PHY接口之间的接口转换逻辑的设计，详细介绍了IX BUS总线接口逻辑设计和POS PHY接口逻辑设计，包括时钟设计的实现、虚拟输出队列的实现、POS PHY LEVEL3接口控制的实现和IX BUS总线BURST方式的逻辑实现。使用FPGA实现整个接口转换逻辑，经过功能自环测试、与其他通信设备对接测试、与通信测试设备对接测试和严格的温度实验，包括循环温度实验和极限温度实验，验证了接口转换逻辑的正确性和稳定性。     

持久性操作系统及其相关技术

在正交持久性系统中，所有数据都是持久的，并可用相同的方式访问。程序设计语言层面的持久性支持具有性能低下、功能重复等缺点，操作系统级别的持久性支持才是更好的解决方案。本文首先介绍正交持久性的概念，然后分析持久性操作系统的需求并给出它的定义，接下来讨论持久性地址空间、影式分页和日志式分页等技术，最后研究一个持久性操作系统一GIrasshopper的设计。     

Polymorphism of pos. I. occurrence and polymorphic transformation

Polymorphic behavior of 1,3-rac-palmitoyl-stearoy 1-2-oleoylglycerol, 99.9% purity (POS) was examined by X-ray diffraction (XRD), differential scanning calorimetry (DSC), solubility measurements and optical microscopy in comparison with 1,3-dipalmitoyl-2-oleoylglycerol (POP) and 1,3-distearoyl-2-oleoylglycerol (SOS). Melt crystallization and solvent crystallization were examined for the occurrence of metastable and stable polymorphs. The number of independent polymorphs was four; α,δ, pseudoβ′ andβ. The lowest melting form, α, was identical to that commonly observed in POP and SOS lowest melting forms. As to the highest melting form,β, the XRD shortspacing pattern was identical toβ ₁ of POP and SOS. This is consistent with crystal habit:β single crystals of POS showed the same shape as those of β₁ of POP and SOS. However, the melting point ofβ (POS), 35.9°C, was lower than those ofβ ₁ of POP, 36.7°C, and of SOS, 43.0°C. Correspondingly, solubility ofβ of POS was lower than that of β₁ of POP below about 13°C, but higher above 13°C. POS did not possessβ ₂ , which is the second stable form in POP and SOS. Two forms of6 and pseudoβ′ occurred, the latter being more stable. The structural properties ofδ showed thatδ is not identical toγ previously observed in POP and SOS. Transformation behavior from the metastable to stable polymorphs of POS showed some differences from those of POP and SOS. Presented at the AOCS annual meeting in Cincinnati, Ohio, in May 1989.     

Polymorphism of POS. II. kinetics of melt crystallization

Melt crystallization of four polymorphs of POS, α,δ, pseudo-β′ andβ, was examined with pure samples (>99.9%). Induction time, τ, for newly occurring crystals was measured with a polarizing microscope equipped with a temperature-controlled growth cell. Rate of crystallization, 1/τ, was obtained for each polymorph, whose identification was done with x-ray diffraction (XRD) and differential scanning calorimetry (DSC). Two modes of crystallization, melt cooling and melt mediation, were applied. From these experiments, the following conclusions were obtained: (i) The rate of melt-mediated crystallization was always higher than of simple melt cooling; (ii) the pseudo-β′ form was crystallized in a wider range of temperature than the less stable δ form; (iii) the occurrence behavior of the polymorphs differed between simple melt cooling and melt mediation; (iv) the δ form was crystallized only by simple melt cooling in a narrow range of temperature, 25.5°C∼28.3°C. This means that there is a possibility that δ may result from racemic compounds that are crystallized in a specific manner. The experimental results are discussed in comparison to 1,3-dipalmitoyl2-oleoylglycerol (POP), 1,3-distearoyl-2-oleoylglycerol (SOS) and cocoa butter.     

连锁超市计算机管理系统设计

介绍了连锁超市计算机管理系统的特点 ,前台POS系统的信息收集和后台MIS系统的信息管理设计方法 ,包括系统的硬件和软件设计方案。