分布事务管理器的性能优化

作为应用服务器重要组成部分的分布管理器主要用于提供分布环境下的事务处理能力,它的性能是制约应用服务器上分布事务吞吐能力的重要因素.讨论了在J2EE应用服务器框架下如何进行分布事务管理器的性能优化,同时给出了分布事务管理器ISTX的性能优化实现.实验数据表明,对ISTX的性能优化能在保证分布事务可靠性的前提下,较大幅度地提高了分布事务处理的性能.

地球科学研究数据的分类与组织研究

科学数据是重要的科技资源,科学数据的共享管理日益成为学术界和政府关注的前沿领域。地球科学门类众多,研究对象复杂且往往时空尺度大,在此过程中产生了大量数据结构形式各异的数据,诸如图型数据、表格数据、文本数据、影像数据等等。在数据库系统环境下如何对这些异构的数据进行存储、发布、显示是科学数据管理必须首先面对的问题。在分析研究地球科学数据特征的基础上,结合黄土高原数据中心的建设实践,以科学数据共享管理为目标,对地球科学研究数据的分类和组织进行了研究。阐述了地球科学研究数据的异构性、密集性、复合性等基本属性和特征,提出了关系类型、空间类型、文件类型等3种基本类型的数据集分类和组织方式,并提出了整编数据集的基本原则和方法以及科学数据分级、保护、共享的方式。实践表明:该数据分类与组织技术方案符合地球科学研究数据的特点,并将科学数据管理与计算机网络技术、信息技术有机结合,具有思路与技术的先进性和广泛的应用场合。

A systems view of integrated coastal management

Natural hazards and human activities in the coastal zone are threatening the integrity of the coastal resource system. Conflicts of interest between short term economic benefits and long term ecologic assets should be identified and solved by means of a balanced CZM approach. Systems analysis, supported by mathematical modelling tools are the appropriate instruments to assist the coastal zone manager. The paper presents a general system description of the coastal zone, and focuses on the modelling of the natural subsystem components of this system as a first step towards a model for Integrated Coastal Management (ICM).

无线HART网络管理器的研究与实现

工业无线网络技术是继现场总线之后，工业控制领域的又一个热点技术，是降低工业测控系统成本、提高工业测控系统应用范围的革命性技术。无线HART规范作为第一个开放的工业无线网络国际标准，在满足工业应用苛刻的可靠性、实时性和安全性等关键需求的同时，还提供良好的向后兼容性，具有广阔的应用前景。网络管理器是无线HART网络的核心设备，是无线HART规范研究与开发的重点和难点。 本文在对工业无线网络技术、无线HART协议及其关键技术、无线HART网络管理器进行详细总结的基础上，从核心算法、软件的设计与实现等方面对无线HART网络管理器进行了研究，取得以下成果： (1)提出了一种基于有向图的独立多路径路由算法。算法包括路由发现和路由计算两个过程。路由发现中提出了基于负载均衡和信号强度的邻居过滤，以及邻居冗余等机制，保证了网络可靠性，降低了算法开销。路由计算中提出了基于双向链路筛选的拓扑构建，基于改进Dijkstra算法的最短路径生成，以及基于启发式搜索的独立多路径筛选等机制，满足了工业应用可靠、实时、低开销和低能耗等性能要求。 (2)提出了基于均衡搜索的通信资源分配算法。采用动态的信道黑名单技术，提高了网络的可靠性；保证所分资源均匀分布在搜索空间中，提高了算法应对网络动态性的能力；与主通信资源反序的冗余通信资源搜索过程，使得不同节点的资源均衡，保证了通信资源分配的公平性。此外，该算法还具有轻型、实时等优点。 (3)设计和实现了无线HART网络管理器软件。针对网络管理器功能复杂，性能要求高等问题，本文采用模块化软件设计方法设计和实现了无线HART网络管理器软件，并将其应用于辽宁省一大型纸业有限公司75吨流化床温度与压力监测系统中。网络管理器长期稳定运行、性能良好的事实表明了设计与实现的合理性。

汽车变速器装配生产线监控系统的设计

生产监控系统在企业生产管理中具有重要的不可替代的地位。网络化生产监控系统适应了企业管控一体化发展的要求,它可以直接与企业上层管理信息系统相融合,使得管理人员可以直观的了解到生产现场细致的生产数据,从而可以在宏观和微观两个方面来把握企业生产、计划、调度、管理。本文以现场总线技术和OPC技术为理论基础,提出了一种网络化监控系统架构,并讲述了其功能,着重阐述了系统功能的设计和实现。

动漫行业创业者胜任特征研究

Venture has become an important force for the sustainable economic growth of China, However, research on entrepreneurs is far failed to meet the actual needs, Animation and Comic Industry is an important component of the state-led Cultural and Creative Industries. Entrepreneurship is the rapid growth of population, but the empirical research on the Animation and Comic Industry entrepreneurs’ Competent Characteristic Model is rarely heard. As a manager of a national incubator which major in Cultural and Creative Industry, study these entrepreneurs competent characteristics is my responsibility. As an exploration, the study uses Competent Characteristic Model of classical design methods and behavior events interview method, and selects entrepreneurs which of animation and comic industry business start-up period as the objects. Through coding analysis of 31 entrepreneurs’ interview information, completed the amendment to the dictionary coding, and ultimately construct the animation and comic industry entrepreneurs need to have the threshold competence model and differentiating competence model. Differentiating competence model includes six competencies: tolerance and optimism, cooperation, creative innovation, pool talents, vision, decision-making and tempo control. Threshold competence model includes twenty features, divided into three dimensions: personal characteristics, knowledge quality, capacity of the quality. Knowledge and capacity of the quality are closely related to the core work of entrepreneurs, Personal characteristics concern the deep-seated motivation of the entrepreneurs. The study also analyses and discusses the characteristics of the entrepreneurs on the demographic variables.

管理干部胜任特征评价方法的初步研究

Competency Assessment Method (CAM) is an important technique of Human Resource Management and Development in theory and practice, especially in personnel selection and training. Based on literatures of related fields, the thesis explored the feasibility of CAM in China. The main results found in this study are as follows: 1. Competencies scored in Behavioral Event Interviews (BEI) are not influenced by length of protocol, by performance in the preceding year. Average level and maximal level of complexity correlate significantly with length of protocol. Total competency frequency of outstanding executives is not significantly different from that of typical executives. These results support McCleland's view. But there is significant correlation between length of protocol and competency frequencies, which which is not agreed by McCleland. We found that competency scores using coding standard of average level and maximal level of complexity show more reliability than that using coding standard of competency frequencies. But this isn't confirmed by McCleland. 2. Inter-rater reliability was studied. The results indicated: total Category Agreement (CA) is 55.45%, over 70 percent of 20 competencies of the inter-rater reliability coefficients based on the classical test theory are significantly correlated. G coefficient based on the generalization theory is 0.85697. 3. Study of criterion sample shows that manager's competencies of China's communication enterprise are as follows: Impact and Influence, Organization Commitment, Information Seeking, Achievement Orientation, Team Leadership, Interpersonal Understanding, Initiative, Market Awareness, Self-confidence, Developing Others. This result in similar to the generic competency model of managers presented in Spencer's book. 4. CAM showed more advantages than the method of experts panel judgement.