国有企业计算机网络管理

本论文在简单了解了计算机网络的相关内容后,对国有企业的计算机网络进行了简单的介绍,并举例说明了某国有企业的网络管理结构及功能。     

Book reviews

Electronic Finance Law Chris Reed, 1993 Hemel Hempstead: Woodhead‐Faulkner. 450 pp. £50.00

Introduction to Computer Law, 2nd Edn David I. Bainbridge, 1993 London: Pitman £18.99

Deontic Logic in Computer Science: normative system specification John‐Jules CH. Meyer & Roel J. Wieringa, 1993 London: John Wiley £34.95, xiv + 317pp.     

Solid-state 2H NMR study of methyl-d3-cobalamin

A solid-state 2H NMR study of methyl-d3-cobalamin has been performed as a function of temperature to provide information concerning the character and energetics of the motion performed by this unique bioorganometallic methyl group. Analysis of the 2H NMR line shape indicates that the methyl group undergoes rapid three-fold rotation, and that the Co-C-2H angle lies between 105.9 and 109.5 degrees. Determination of the spin-lattice relaxation times T1 shows that the relaxation is anisotropic, consistent with a "jumping" motion of the methyl group rather than rotational diffusion. This also provides the activation energy to methyl jumps as 8.3 +/- 1.3 kJ/mol. It is proposed that this energetic barrier may be a useful probe of changes in the electronic character of the Co-C bond that accompany the biological role of this molecule in such enzymes as methionine synthase.     

Optimizing Power Plant Thermal System Design Using "Process Energy Integration" Method

The paper presents a renovation of thermal system design of a power and heat cogeneration device by utilizing the "Process Energy Integration Method". The new alternative obtains prominent energy saving result.     

Rapid assessment of the drug-injecting situation at Hanoi and Ho Chi Minh City, Viet Nam

This paper describes a rapid assessment of the drug-injecting situation in Viet Nam. The study, which was carried out over a five-week period during October and November 1993, focused on the cities of Hanoi and Ho Chi Minh City. A multi-indicator inductive methodology was adopted that mixed qualitative and quantitative measures. As only limited background epidemiologic and official statistics were available, the study involved the generation of original data, through, for example, the construction of "cognitive maps" describing broad patterns of drug use, semi-structured interviews (for the collection of baseline data), focus groups, in-depth interviews and ethnographic observations. The study revealed that the injection of "blackwater" opium proliferated, often in combination with a range of pharmaceutical preparations. High-risk injecting practices were common at both Hanoi and Ho Chi Minh City, drug scenes and congregation sites being more public and visible at Ho Chi Minh City. The implications for policy and practice are discussed, emphasis being placed on the need for outreach and peer intervention.     

Anisotropy of radiance in tissue phantoms and Dunning R3327 rat tumors: radiance measurements with flat cleaved fiber probes

OBJECTIVE: To compare the prevalence of conduct problems (CP) according to level of urbanization and to determine which factors account for the potential difference in prevalence rates. METHOD: Study 1 used a questionnaire survey of a nationally representative sample of 10,462 Norwegian adolescents. Study 2 used a questionnaire survey of a representative sample of 1,346 adolescents living in Oslo. Self-reported CP included most DSM-III-R criteria for conduct disorder. RESULTS: CP rates were similar in all levels of urbanization, except for the only semimetropolitan city in the country, the capital Oslo, which had CP rates twice those of the rest of the country. This increase rate could not be explained by a series of commonly advocated explanations: family structure and parental practices, social network, socioeconomic status, integration in community activities, religious involvement, and race. However, involvement in "soft" drugs and associating with antisocial peers could explain the statistically differential rates. Furthermore, in the Oslo study, adolescents' CP did not vary according to density of population or region within the city. CONCLUSIONS: The results support previous studies showing increased rates of CP in urban areas. However, urbanization must pass a certain threshold before it has this effect. Moreover, the lack of support for commonly advocated explanations for the difference between urban and nonurban areas suggests that investigations specifically addressing potential explanations for this difference should be conducted. The results indicate that the increased rates of substance use in highly urbanized areas may account for the difference in CP rates by prolonging and aggravating CP.     

基于递阶综合评价模型的电力用户能效评估系统

针对电力用户能效评估,建立了基于递阶综合评价方法的能效评估系统,该系统将能效评估过程分解为三个层次,分别为基于G1群组判断的一级指标评估、基于熵权法的二级指标评估以及最终的综合评估,充分结合主客观评价信息,克服传统单一赋权法局限性,因而能有效地运用到电力用户能效评估的日常工作中。     

基于WebGIS的开封市电子地图系统设计与实现

WebGIS技术是WWW技术和Internet应用于GIS开发的产物,是实现GIS互操作的一条最佳解决途径。基于MapGIS的WebGIS系统实现的主要功能是电子地图的网上发布,在对地图"数字化"的基础上,实现放大、缩小、漫游、更新、全图显示、鹰眼等基本操作,以及查询、分层显示、计算距离和面积等功能。本系统以MapGIS为二次开发平台,MapGIS-IMS工具包提供了一系列ASP函数和Java文件,开发者可以在这些函数的基础上进行IMS的扩展编程,实现WebGIS的研究与开发。     

高校校园网故障分析与网络维护

本文基于我校的校园网整体构架和认证计费策略,提出了在各类网络故障维护过程中,本着先软件后硬件、先本机后网络的原则,从软件类故障和硬件类故障两个大的方面进行分析和排查,确定各类故障的定位和解决办法。