组态软件实时数据库系统研究及设计

利用Windows的DLL(动态连接库)和全局共享内存技术来建立系统实时数据库的设计思想,采取传统数据库系统、文件系统和内存数据库系统兼用,利用多种存储介质来构造系统的实时数据库系统,并通过给用户提供一套接口标准——实时数据库系统接口,来实现I/O驱动程序与用户程序和实时数据库系统间的高速数据传递。     

中国高技术产业技术创新动态能力演化研究

高技术产业的蓬勃发展过程中技术创新的作用至关重要,因此高技术产业技术创新成为全世界各国竞争的核心与学术研究的热门。为了探究高技术产业技术创新动态能力的演化过程,本文根据经典物理力学理论,构建中国高技术产业技术创新动态能力演化三维动态模型,从技术创新动态能力的主导逻辑思维出发,以能力广度、能力深度、能力的生命周期三个角度,对高技术产业技术创新动态能力演化模型进行维度分析。研究表明高技术产业技术创新动态能力演化过程在空间内形成类似于S型的曲面。     

Off line simulation system of machining processes

The primary objective for modeling of machining processes is to develop a predictive capability of machining performance in order to facilitate effective planning of machining operations. This capability leads to faster implementation, higher performance, quality at a lower cost. This comes about due to improved selection of machining parameters, optimal fixture design and the avoidance of tool failure. The simulation system presented simultaneously considers the effect of cutter geometry, the cutter's initial position errors, workpiece geometry, machine tool dynamics, and workpiece/fixture system dynamics on the machining process.The integration of all of the above in one model provides an off-line tool to simulate and optimize the machining parameters and the fixture configuration cutting both lead and production time. The modular nature of the simulation system presented allows for the study of many different machining processes. The cutting forces in this system are modeled using a mechanistic approach. NURBS curves and surfaces are utilized for the geometric modeling and simulation of the machining process. While a finite element method is used to model and analyze the workpiece/fixture dynamics. Two case studies are presented to demonstrate the practical application of the presented simulation. The first case presents the optimization of the fixture configuration of a generic automotive component. While the second case presents the results of simulations performed on a novel mill/grind machining process. This process is a combination of face milling and grinding in one operation. Some simulated results are presented along with experimental validation.     

SGML、HTML与XML的比较

本文分别介绍3种标记语言：标准通用标记语言(SGML)、超文本标记语言和可扩展标记语言(XML)，并对其作简单的比较。     

银川平原浅层地下水资源和水盐调控研究

在阐述银川平原浅层地下水形成分布规律性的基础,首次在该地区采用三维地下水有限差分模型计算了地下水资源量、补排组构和可利用量。论证和提出用有害盐量取代以往惯用全盐量评价盐害和计算排引比的传统做法,通过水盐均衡计算指出30多年来灌区——直处在脱盐状态。论证和提出了银北灌区各类水量的宏观调控意见,动态模拟计算了不同规划水平年引、排水9套方案,提出了不同地区和采用不同方案引用黄河水量和开发利用地下水量的意见。     

浅谈XML与HTML和关系数据库的比较

XML技术作为一门新兴技术,在许多领域得到广泛的支持并有着广阔的应用前景,其与HTML以及关系数据库之间的关系是值得探讨的。本文得出结论:XML并不是要替代HTML和关系数据库。HTML、关系数据库及XML将凭借各自的特点继续适用于其合适的领域。     

Exploring the forward citation patterns of patents based on the evolution of technology fields

Forward citations of patents have been used extensively to capture the impact of technological knowledge. However, our understanding of the factors shaping patent citation patterns remains limited. One of the main limitations is the lack of scholarly attention paid to the dynamic influences arising from the evolution of technology fields. From an evolutionary perspective, technological impact is not simply determined by the static attributes of a technology itself; it is also dynamically affected by changes in the external conditions. Drawing on this viewpoint, this study suggests a model for understanding patent citation patterns by reflecting the evolution of the technology fields to which each patent belongs. Four such factors are explored: technology cycle time, potential of technological convergence, popularity of the technology field, and technological novelty. Based on the proposed model, we show how expected citation patterns can change as a result of different scenarios for technology field evolution. We conduct a case study of patents in the information technology and healthcare industries to show citation patterns of patents across heterogeneous industries as well as those within an industry. Contributions to the innovation literature and research investment decisions are discussed.     

文化、观念与制度——国家体育软实力理论模型构建与动力机制分析

以文献资料和理论分析为基本方法,在国家体育综合实力的层面提出并深入分析了体育软实力概念。明确了体育观念、体育文化和体育制度等无形的非物质要素是体育软实力的资源基础和载体。以此为基础,构建了包括表层、中层和核心层三个层面的国家体育软实力三维结构模型,并重点对该模型中耦合软实力所包含的文化——观念动力系统、文化——制度动力系统、观念——制度动力系统的动力机制进行了分析,提出了体育软实力建设的对策建议。     

基于DSP受电弓动态调整及其受流状况检测方法研究

本文提出一种用于电力机车运行实验检测系统,它是以DSP为核心的在检测弓网动态接触力的同时会对其进行实时调整,并会全程记录下受电弓的受流质量,这可以为以后确定接触网需要检修的位置提供依据。在本文中将介绍这一实验检测系统的设计方法过程。     

SaaS中的离线应用研究

随着SaaS（Software as a Service）和云计算技术的成熟和不断实践,越来越多的软件将从桌面平台移植到互联网这个广大的平台。离线应用作为SaaS应用中的核心技术之一也得到越来越多的关注。对当前SaaS中离线应用开发技术（Cookies、ADO.NET、Google Gears与Dojo Offline、HTML5）作了研究。