LKJ2000型屏显故障原因分析及其启示

文章通过对2000屏显主要故障原因的分析,提出了处理各种问题的解决方案,以作为现场LKJ2000型监控装置维护人员的参考和提高屏显可靠性的一些建议。     

关于W_m·K_n的边色数和全色数

设有一点u和m个Kn的联图为Wm·Kn,则有V(W m·K n)={u}∪{v i 1,vi 2,,vi n|i=1,2,,m}E(W m·K n)={u vi 1|i=1,2,,m}∪{v 1 1v 2 1,v2 1v 3 1,,v(m1)1v m 1,vm 1v 11}∪{v i j vi k|i=1,2,,m;j=1,2,,n-1;k=j+1,j+2,,n}.本文主要研究了Wm·Kn的正常边染色、邻点可区别边染色和全染色系列染色问题,并分别得到了相应的色数。     

在CIQ2000系统中完善"企业监管信息"模块的探讨

研究在CIQ2000系统中完善"企业监管信息"模块的功能,强化企业进出口信息的统计和查询功能;对登记监管记录、企业信息等内容提供丰富的空间;对涉及检验检疫法律法规的违规行为进行初步分级,建立违规库.     

Accessing healthy food: availability and price of a healthy food basket in Scotland

Access to healthy food and its marketing have been asserted as limitations on changing behaviour to improve diet. A retailer survey in Scotland is reported that considered availability and affordability of a basket of indicator healthy food items, termed the Healthy Eating Indicator Shopping Basket (HEISB). It comprised 35 items drawn from 5 major food groups. A census of HEISB availability in 466 stores was undertaken in a sample of locations that varied on dimensions of urban-rural and affluent-deprived. Around half of the supermarkets surveyed stocked all the items. Availability of healthy food items was generally seen to be adequate but there were notable variations in availability for specific items. There were large variations in price for the HEISB items across the stores and the survey areas. The total HEISB median price varied by store type. Basket price tended to rise with deprivation with a caveat of the lowest prices in the most deprived areas. Accessibility to a range of healthy food depends more on the presence of medium and large stores than being in a deprived or affluent area.     

关于Windows 2000的漏洞解决浅析

Windows 2000操作系统本身以及作为网络操作系统存在一定的安全隐患,如微软Windows 2000登录验证机制漏洞和Windows 2000操作系统远程服务中都存在漏洞和安全隐患.只要经过适当的技术防范、设置和调整,Windows 2000使用的相对安全可以得到保证。     

Recreation vs conservation in Natura 2000 sites: a spatial multicriteria approach analysis

Because of its high naturalness and biodiversity, Natura 2000 network (N2K) is becoming increasingly important for recreational opportunity, providing benefits in terms of physical and mental health through outdoor experiences. Nature-based tourism (NBT) is tourism based on the natural attractions of an area: the greater the recreation opportunities, the greater the attractiveness to people. N2K sites are suitable places to favour the development of the NBT, as N2K is not a system of strict nature reserves from which all human activities would be excluded. The approach to conservation and sustainable use of N2K areas is much wider, largely centred on people working with nature rather than against it. To do this, a balance between nature-based tourism development and ecological protection should be reached. In this work, we propose the application of spatial multicriteria analysis, in order to analyse multiple conflicting dimensions interacting over time, considering in particular both criteria related to NBT development and ecological protection. The aim of the work was to analyse the opportunities of Nature-based tourism development in N2K in Umbria, one of the Regions of central Italy, which consists of 102 sites. In particular, the work considered the conditions of biodiversity conservation, flora and fauna, as well as the leisure opportunities provided by the sites and the pressure produced by human activities on them. A spatial multicriteria analysis has been carried out to understand the potentiality of the N2K at territorial level. In particular, the proposed methodology would like to support decision makers in the identification of N2K sites in which NBT activities could be improved and developed, in a balanced way according to biodiversity conservation. Results show, according to preferences set by three different kinds of experts, that only a small bunch of N2K sites could be suitable for an increase of the NBT.     

用Excel高级功能在储量计算明细表中的应用

中文版Excel是Microsoft公司推出的电子表格制作软件,储量计算明细表则是矿山储量管理中最重要的基础资料.本文以Exce12000为例,通过自定义储量明细表中的函数、宏,建立工具按钮,打造个性化的工具栏,挖掘其潜力,扩展了Excel的应用.     

Discrete choice model analysis of mobile telephone service demand in Japan

This paper analyzes the demand for mobile telephones including second generation (2G) and third generation (3G) by using a discrete choice model called a mixed logit model. First, we examine the substitution patterns of the demand for mobile telephones and show that demand substitutability among alternatives is stronger within the provider nest category than within the standard nest category in mobile telephone services. The closest substitute for NTT’s 3G service is NTT’s 2G service, rather than KDDI’s 3G service, for example. Second, we investigate the elasticities of demand for various functions including e-mail, Web browsing, and moving picture delivery. Consequently, we cannot observe marked differences between 2G and 3G services based on these calculated elasticities, indicating that it takes time for 3G subscribers to gain proficiency with such new services.      

Windows 2000的安全机制剖析

操作系统的安全性是操作系统的核心问题之一。文章主要从访问控制的角度,结合WindowsNT到Windows2000的发展过程,通过分析Windows2000安全机制中不同层次的组件,如安全描述符、访问控制列表、访问令牌、访问掩码等,逐步深入地探讨了Windows2000是如何强化其安全机制的。     

Optimal impulse control for cash management¶with quadratic holding-penalty costs

This paper studies optimal control for an infinite horizon cash management problem where the cash fund fluctuates as a Brownian motion. Holding-penalty costs are assumed to be a quadratic function of the cash level and there are fixed and proportional transaction costs. Using the “impulse technique”, we prove that optimal control exists and takes the form of a control band policy. Received: 4 January 2001 / Accepted: 5 June 2001