基于最优乘子潮流估计的故障筛选与排序

提出了一种用于电压稳定安全评估的快速故障筛选和排序方法。该方法从故障前的临界点出发,通过最优乘子潮流法计算得到的故障后边界点来估计故障后临界点,当初始点接近临界点,通过一次迭代即可满足所需的计算精度,从而快速地识别出非严重故障。对于严重故障和某些特殊情况的故障进行了分析并提出了解决办法,保证了对严重故障的估计精度。通过某一实际703节点系统算例验证了该方法的有效性。     

在线电压稳定监测中的一种事故扫描新方法

根据事故后稳态潮流与它们各自的电压稳定裕度指标的对应关系,提出了一种新的事故筛选指标,并从所有预想事故中筛选出一定数量的事故进入严重事故集,然后用改进连续潮流法求解对应的有功裕度指标并进行排序,极大地提高了事故扫描的速度,可应用于在线电压稳定监测。同时将该方法用于某省网系统的在线电压稳定监测计算,取得了显著的效果。     

2008电网控制中心新技术综述

综述了2008年IEEE PES General Meeting 和2008年CIGRE大电网会议主要内容。内容包括：CIGRE关于新一代能量管理系统/市场管理系统(energy management system/market management system,EMS/MMS)结构设计;EMS的公用数据接口标准化规范的信息结构;高性能计算(并行计算)在控制中心的应用。这些内容可能代表了当代电力系统控制中心新技术的发展方向,可为我国从事EMS/MMS研究和实际工作的人员提供参考。     

应用电力仿真软件PSS/E计算网络可用传输能力

可用输电能力(ATC)是指导电力市场交易的重要指标,对系统规划与运行具有重要影响;PSS/E是一种有效的机电暂态分析软件,利用其快速的潮流计算功能及扩展接口可进行ATC指标的计算分析,为电网规划与系统分析人员提供便利。引入ATC指标的定义及主要解算方法,详细分析了PSS/E软件基于直流潮流和交流潮流的ATC计算模型和流程,以及用于N-1故障严重性排序的两种行为性指标。针对IEEE30节点系统算例进行比较分析,计算结果表明了软件ATC指标计算和应用的可行性。     

Exploring the impact of organisational,technological and relational contingencies on innovation speed in the light of open innovation

ABSTRACT

Striving for competitive advantage pushes firms to innovate at a high speed along innovation contingencies and resource limitations they face. Yet, little is known about how management of contingencies such as absorptive capacity or technology radicalness can impact the innovation speed of firms. In this explorative study, we provide new empirical evidence to the innovation speed literature. We examine to what extent innovation speed is affected by organisational, technological, and relational contingencies that preoccupy firms with open innovation practices. Taking the firm perspective, we track innovation timeline and emphasise the complex trade-offs that firms encounter while innovating. Our results show that many of the contingencies, emphasised by the literature promoting innovation, could slow down its speed. Thus, strengthening competitiveness by accommodating contingencies can hinder time-critical adaptations. Furthermore, we find that innovation assets and capabilities can become liabilities for technologically innovative firms.     

The rise and fall of an executive information system: a case study

The progress of an executive information system project within a manufacturing organization over a period of 9 years is described. The case study illustrates the importance of the interaction between the business environment, the organizational environment and the perceptions and interpretations of events and facts by stakeholders on the success or failure of an information system. It shows the importance of context in the development and implementation of an executive information system and the dynamic nature of the influence of social, economic and technical factors. The reasons for the initial success and the subsequent failure of the EIS within the company are explored from a contingency perspective.     

Freudian theory and new information in modern psychology.

Freud's work is reviewed in light of five new areas of information that were not available to him. The five areas are: (a) anthropology's finding of the cultural nature of humanity; (b) empirical studies of the mother-infant affectional interaction and of the competence of infants; (c) the discovery of rapid eye movements (REM); (d) the role of emotions in social communication as well as individual arousal; and (e) the burgeoning of the psychology of sex differences, especially in cognitive style. The tension between Freud's clinical observations and his metapsychology is interpreted as a function, in part, of gaps in then existing knowledge. The review suggests that the concept of the cultural nature of humanity, with the attachment emotions of shame and guilt as part of human equipment, was implied in Freud's clinical observations and could have eased Freud's theoretical difficulties. As an example of the usefulness of this concept, the views of psychoanalysis and behavior theory about phobias are examined, showing that both approaches can profit from attention to the attachment emotions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

What can be controlled: actionable ICT4D in the case of Palestine

ABSTRACT

A thriving information and communication technology (ICT) economy is an aspiration for developing countries. This research identifies the factors that can motivate or inhibit ICT opportunities in a developing country to grow a sustainable economy. We build an ICT4D decision framework that provides a three-dimensional view based on (1) key factors (e.g. infrastructure, policies), (2) the ICT supply chain, and (3) stakeholders (e.g. industry, government, academia). The framework is applied to the case of Palestine. We use secondary and primary data to understand how both controllable and non-controllable country characteristics have contributed to or inhibited the growth and development of an ICT sector. Results from extensive secondary data sources demonstrate the usability of the framework to analyze the current setting of the ICT sector, in addition to help investigate a range of possible opportunities for action. Then, via a targeted set of interviews with academic, industrial, and governmental sources who are experts in the Palestinian ICT arena, we perform an exploratory study that focuses on key controls and impacts for future development of the ICT economy. The outcomes of this research have the ability to frame and inform economic development decisions that could define the future of the Palestinian state.     

大学生自尊权变性:双重权变形式模型的构建

目的构建大学生自尊双重权变形式模型,并检验量表信度和效度。方法采用开放式问卷分析以形成理论建构并编制量表。使用量表对1030名大学生先后进行两次施测,并对结果进行探索性因子分析和验证性因子分析以建立和验证模型的结构。最后,对量表进行内部一致性、内容效度、关联效度和区分效度的检验。结果构建了大学生自尊双重权变形式模型。自尊权变性存在两种不同而并立的结构——"结果导向"权变形式和"过程导向"权变形式。"结果导向"包含他人认可、个人成就、人际接纳、外表吸引力四个一阶维度,"过程导向"包括自主评判、人际支持、个人提升、真实表达四个一阶维度。结论研究提出的自尊双重权变形式模型具有良好的信度和效度。     

城市内涝灾害应急救援兵棋推演研究

针对近年来城市内涝灾害给居民、交通及城市基础设施带来的巨大影响,以低成本发现高风险事件和应急预案漏洞为目标,通过兵棋推演模拟城市内涝灾害应急救援过程。依据兵棋推演与灾害理论,结合GIS技术、决策树等方法,综合建立了动态兵棋棋子模型、暴雨规则、可视化地图及兵棋推演模型,实现了城市内涝灾害应急救援兵棋推演。结果表明:在设定的5年一遇暴雨情景及18个推演回合下,两个应急救援行动方案中,我方行动1虽能完成内涝灾害应急救援,但造成损失的概率非常高;我方行动2能够完成内涝灾害应急救援,且造成损失的概率较小。将兵棋推演方法引入到城市内涝灾害应急救援中,可准确的推演应急预案的可行性,研究成果对提高有关应急部门灵活处理应急事件的指挥能力、管理能力与决策能力具有重要意义。