PLATINUM SQL-Station完善PowerBuilder的应用开发

ＰＬＡＴＩＮＵＭＳＱＬ－Ｓｔａｔｉｏｎ完善ＰｏｗｅｒＢｕｉｌｄｅｒ的应用开发●廖钢城一、概述许多ＰｏｗｅｒＢｕｉｌｄｅｒ用户都以为ＰｏｗｅｒＢｕｉｌｄｅｒ能够满足数据库应用开发的所有需要。其实不然，ＰｏｗｅｒＢｕｉｌｄｅｒ的着眼点显然是在应用开发的...     

在PowerBuilder中实现动态查询

ＰｏｗｅｒＢｕｉｌｄｅｒ是现今最为流行的数据库前端开发工具。如何在ＰｏｗｅｒＢｕｉｌｄｅｒ中实现动态查询呢？本文以楼宇信息管理系统（ＢＩＭＳ）为实例,探讨动态查询在ＰｏｗｅｒＢｕｉｌｄｅｒ中的制作与实现。１ＢＩＭＳ系统分析楼宇信息管理系统（ＢＩＭＳ）...     

电脑书屋

《ＰｏｗｅｒＢｕｉｌｄｅｒ５．０／６．０编程指南》人民邮电出版社出版１９９８年９月第１版定价：３３．００元ＰｏｗｅｒＢｕｉｌｄｅｒ是目前非常优秀、十分流行的数据库前端应用程序开发工具。本书所介绍的ＰｏｗｅｒＢｕｉｌｄｅｒ６．０是其最新版本，而Ｐｏｗｅ...     

PowerBuilder与Windows的消息连接

ＰｏｗｅｒＢｕｉｌｄｅｒ是一个基于Ｗｉｎｄｏｗｓ的前端应用开发平台，用它开发出来的应用就是一个普通的Ｗｉｎｄｏｗｓ应用。文中首先对ＰｏｗｅｒＢｕｉｌｄｅｒ中对象、事件的行为实质以及对象之间、应用之间的通信方式作了分析，然后给出了ＰｏｗｅｒＢｕｉｌｄｅｒ如何与Ｗｉｎｄｏｗｓ进行消息通信的方法。     

用 PowerBuilder实现“宏代换”

本文介绍了用 ＰｏｗｅｒＢｕｉｌｄｅｒ实现“宏代换”的几种方法,并给出了详细的 ＰｏｗｅｒＢｕｉｌｄｅｒ脚本（程序）清单。     

PowerBuilder库结构分析与文档生成的研究

本文首先分析ＰＢＬ库的结构，然后定义了一套ＰｏｗｅｒＢｕｉｌｄｅｒ对象的注释规范，最后实现了一个“ＰｏｗｅｒＢｕｉｌｄｅｒ对象功能规格说明文档系统”。     

利用PowerBuilder开发客户机／服务器应用

本文介绍了客户机／服务器模式下的开发工具ＰｏｗｅｒＢｕｉｌｄｅｒ４．０，对利用ＰｏｗｅｒＢｕｉｌｄｅｒ开发前端数据库应用的整个过程进行了详细的描述，并对数据窗口中基本的数据库维护操作给出了完整的Ｓｃｒｉｐｔ编码。对想利用ＰｏｗｅｒＢｕｉｌｄｅｒ开发客户机／服务器应用的各位同行，具有一定的参考价值。     

用PB实现火发电厂的设备缺陷管理

本文主要讨论了客户／服务器结构中，用ＰｏｗｅｒＢｕｉｌｄｅｒ实现火力发电厂的设备缺陷管理，并结合自己的开发经验，总结了ＰｏｗｅｒＢｕｉｌｄｅｒ开发工具的一些特点。     

虚拟仪器测试系统中实现数据共享的方法

介绍了ＬａｂＷｉｎｄｏｗｓ／ＣＴＩ和ＰｏｗｅｒＢｕｉｌｄｅｒ的特点,提出了一种通过ＯＤＢＣ实现ＬａｂＷｉｎｄｏｗｓ／ＣＴＩ和ＰｏｗｅｒＢｕｉｌｄｅｒ之间数据共享的方法。     

数据库开发工具POWERBUILDER与ODBC接口

ＯＤＢＣ是个通用数据库接口，ＰｏｗｅｒＢｕｉｌｄｅｒ是数据库开发工具，本文分析ＯＤＢＣ的结构，并描述了用ＰｏｗｅｒＢｕｉｌｄｅｒ通过ＯＤＢＣ接口进行数据库开发的接口设置。     

形式语言中的几个算法问题

引导学生关注学科前沿,培养学生理论研究兴趣是高校教学的重要任务之一。笔者尝试在编译原理的教学中,引导学生思考关于计算的基本问题:如何描述问题,是否有问题没有算法,等等。文章从编译原理课程中形式语言与自动机部分内容中,引出字符串匹配、自动机等价测试、上下文无关文法等价测试等问题,证明有不可计算的问题,介绍和分析相关算法,引导学生理论研究兴趣,拓展课程学习深度和广度。     

Remote sensing of soil salinity: potentials and constraints

Soil salinity caused by natural or human-induced processes is a major environmental hazard. The global extent of primary salt-affected soils is about 955 M ha, while secondary salinization affects some 77 M ha, with 58% of these in irrigated areas. Nearly 20% of all irrigated land is salt-affected, and this proportion tends to increase in spite of considerable efforts dedicated to land reclamation. This requires careful monitoring of the soil salinity status and variation to curb degradation trends, and secure sustainable land use and management. Multitemporal optical and microwave remote sensing can significantly contribute to detecting temporal changes of salt-related surface features. Airborne geophysics and ground-based electromagnetic induction meters, combined with ground data, have shown potential for mapping depth of salinity occurrence. This paper reviews various sensors (e.g. aerial photographs, satellite- and airborne multispectral sensors, microwave sensors, video imagery, airborne geophysics, hyperspectral sensors, and electromagnetic induction meters) and approaches used for remote identification and mapping of salt-affected areas. Constraints on the use of remote sensing data for mapping salt-affected areas are shown related to the spectral behaviour of salt types, spatial distribution of salts on the terrain surface, temporal changes on salinity, interference of vegetation, and spectral confusions with other terrain surfaces.As raw remote sensing data need substantial transformation for proper feature recognition and mapping, techniques such as spectral unmixing, maximum likelihood classification, fuzzy classification, band ratioing, principal components analysis, and correlation equations are discussed. Lastly, the paper presents modelling of temporal and spatial changes of salinity using combined approaches that incorporate different data fusion and data integration techniques.     

Survival analysis of a neotropical rainforest using multitemporal satellite imagery

We present results of an analysis of deforestation at a UNESCO Biosphere Reserve, the Parque National Yasuní, located in the rainforests of eastern Ecuador using multitemporal Landsat TM and ETM+ satellite imagery. Using survival analysis, we assessed both current and future trends in deforestation rates, and investigated the impact of spatial, cultural, and economic factors on deforestation. These factors included the distance from roads, rivers, research facilities, oil facilities, markets and towns, and land ownership by colonists, native inhabitants, and an oil company. We found the annual rate of deforestation is currently only 0.11%, but that this rate is increasing with time and, assuming that the trend of increasing rate of forest loss continues, we would predict that by 2063, 50% of the forest within 2 km of an oil access road will be lost to unhindered colonization and anthropogenic conversion. The Quechua colonists are associated with areas of the highest rate of deforestation, followed by the native Huaorani and the lowest region of deforestation was in areas occupied by a local oil company. By far, the strongest predictor of where deforestation is predicted to occur was proximity to the road. Proximity to research sites, oil facilities, market, and rivers significantly decreases deforestation rates, and proximity to towns significantly increases deforestation rates.     

构建安全的局域网策略

网络安全是一门涉及计算机科学、网络技术、密码技术、信息安全技术、应用数学、教论、信论等多种学科的综合性学科,它涉及的因素主要包括物理安全、系统安全、信息安全和文化安全等范围。局域网络中人为的、非人为的,有意的、无意的;非法用户入侵、计算机病毒、黑客的不断侵袭等随时威胁局域网的安全。随着计算机网络技术迅速发展,网络安全问题也日渐突出。该文分析了威胁局域网安全的主要因素,探讨了从物理环境、网络层、应用层以及管理制度方面,运用VPN、NAT、VLAN、IDS、身份验证等技术构建安全局域网的策略。     

SMOTE过采样及其改进算法研究综述

近年来不平衡分类问题受到广泛关注。SMOTE过采样通过添加生成的少数类样本改变不平衡数据集的数据分布,是改善不平衡数据分类模型性能的流行方法之一。本文首先阐述了SMOTE的原理、算法以及存在的问题,针对SMOTE存在的问题,分别介绍了其4种扩展方法和3种应用的相关研究,最后分析了SMOTE应用于大数据、流数据、少量标签数据以及其他类型数据的现有研究和面临的问题,旨在为SMOTE的研究和应用提供有价值的借鉴和参考。     

群智能新研究:角色?匹配的狼群劳动分工

启发于生物狼群群体的劳动分工行为,本文提出一种新颖的角色?匹配狼群劳动分工方法。通过剖析自然狼群的生物学行为,概括提炼出狼群劳动分工行为的个体任务的专职化、个体角色可塑性和任务分配均衡性3个典型特征,并建立了生物狼群劳动分工行为与普适性任务分配问题之间的仿生映射关系;从狼群“个体?个体”+“个体?环境”的交互方式角度出发,分析了角色?匹配的狼群劳动分工的个体角色转换和任务调整机制,研究了狼群角色?匹配的柔性劳动分工机制,提出了一种新的群智能方法,即角色?匹配的狼群劳动分工方法;将狼群的角色?匹配劳动分工与蚁群的刺激?响应劳动分工和蜂群的激发?抑制劳动分工进行了比较分析,并展示出角色?匹配狼群劳动分工方法的应用前景。     

基于Lucene的文本搜索引擎的设计和实现

随着局域网信息的海量增长,个性化的轻量级搜索引擎已经被中、小型企业和校园关注和青睐。本文在研究搜索引擎基本原理的基础上,通过Lucene、JSP和Struts2等技术实现多种类型文件的文本内容的检索功能。测试结果表明,该系统实现了局域网内部对HTML、PDF、Word、txt等格式文件的内容提取和解析,具有开放性、可扩展、实时性和安全的特点,成功达到了预期目标。     

On Belief and the Making of All Things Beautiful and Sublime: Creation by Ordinance and Destruction by Chaos

This is a study of beauty as a construct and a property of structural composition. I examine alternate possibilities of structural compositions, linguistics, or material arguments that beauty, impossible in utter chaos, might not be definitely found in order, but the latter is essential thereto. A distinction is also made between complex systems of order found in nature, often qualified as organic—the seemingly free and flowing forms found in formal sophistication beyond simple geometrical reduction—and the absence of order as pure chaos. Beauty is examined through order from historical linguistic, perceptual, and systemic constructivist perspectives, along with the sublime and the harmonious. Linguistically, order is a term of convergence of the seemingly disparate streams of significance of rank—in society, religion, and the belief in collective constants—and ornament is a term of bearing beauty and enhancement of taste that emanates from within the structure and should not be reduced to superficial application. I cite costume, including accessories of weaponry, as moments of proximity between style, purpose, utility, and the collective as semiotic bearer of meaning in culture and social order.     

EPISTEMIC PERSPECTIVE—ACT—PARADIGM

The paper is conceived as an introductory part of a larger unit. An ontology is proposed, based on three fundamental concepts: epistemic perspective, act, and paradigm (in T. Kuhn's sense of this term). Therefore, the point of departure is Kuhn's philosophy of science and some kind of ontology involved. The common denominator of considerations presented in this paper may be called a systems approach or systems spirit. In the author's view, the “doctrinal choice,” which appears in general systems theory, arguing either that general systems, as they are, really exist (Bertalanffy, Boulding, Rapoport, Mesarovic), or that only isomorphic systemic objects exist really (Laszlo, Bunge, Sadovsky), may be avoided. This doctrinal choice is a counterpart of the ancient problem of universals in philosophy (i.e. nominalism vs. essentialism). The problem of existence, one of the fundamental questions in philosophy, was reduced (or rather replaced) by the problem of point of view (epistemic perspective), or—strictly speaking—question, if epistemic perspective may be considered as an entity having autonomic ontological status, i.e. independent of the knowing subject. The concept of “act” was borrowed from phenomenology, as it appears in writings of E. Husserl (“Ideas I”) and some of his philosophical descendants (e.g. M. Merleau-Ponty, and R. Ingarden).