云南少数民族地区计算机高等教育的现状与思考

本文从云南少数民族计算机高等教育的概念出发,分析了当前云南省民族地区计算机高等教育的现状以及存在的问题,并在此基础上提出了民族地区少数民族高等教育的对策。     

Hierarchical Reliable Multicast: Performance Analysis and Optimal Placement of Proxies

This paper studies the use of multicast together with proxy nodes for reliably disseminating data from a single source to a large number of receivers. In order to achieve reliability, data must be retransmitted in case of loss either by the source or by special network nodes, called proxies. Each proxy is responsible for reliably delivering the data to a subgroup it is assigned. The multicast tree is partitioned into subgroups that form a hierarchy rooted at the source, hence the term hierarchical reliable multicast. The performance of this approach strongly depends on the topology and the loss characteristics of the underlying tree and the location of proxies. In the first part of the paper, we study the processing and bandwidth performance of such a reliable multicast dissemination given the tree and the placement of proxies. In the second part of the paper, we develop dynamic programming algorithms that give a placement of a fixed number of proxies on an arbitrary tree that minimizes the bandwidth used for reliable transfer. The first algorithm provides an optimal solution to the multicast proxies location problem in polynomial time, in the number of nodes and proxies. The second is an approximation algorithm that gives a solution with cost within a chosen precision from the optimal, in an improved running time. An optimal and an approximate solution are also provided for the proxies location problem if unicast is used for transmissions. Applications of this dynamic programming approach to related problems are discussed.     

新时期品牌形象推广面临的问题及对策

随着国家经济文化的快速发展,新形势下品牌形象在设计推广中面临前所未有的竞争和挑战。通过对新时期品牌设计与经济民生的作用,品牌推广对智能科技与文化价值输出的影响,以及品牌设计对人才培养及企业发展与社会责任等多方面问题分析,从品牌视觉传达设计管理角度,根据多年实践经验总结、梳理出影响品牌推广的宏观和微观的关键内容。通过对新时期下社会发展人才需求的分析,找到专业的学科新架构和学科人才培养方向,为解决国家、城市、企业品牌建设和社会经济发展服务找到更好的方式和方法。     

栾川钼矿田的开发和利用

介绍了栾川钼矿资源概况及开发现状,分析了栾川钼资源在开发利用过程中存在的问题,提出了今后对栾川钼矿资源综合开发利用的建议与对策。     

Asserting the utility of using the Cowichan Problem Set

Parallel programming environments provide a way for programmers to reap the benefits of parallelism, while reducing the effort required to create parallel applications. The CO₂P₃S parallel programming system is one such tool that uses a pattern-based approach to express concurrency. Using the Cowichan Problems, we demonstrate that CO₂P₃S contains a rich set of parallel patterns for implementing a wide variety of applications running on shared-memory or distributed-memory hardware. An example of these parallel patterns, the Search-Tree pattern, is described and it is shown how the pattern was used to solve the Fifteen Puzzle problem. Code metrics and performance results are presented for the Cowichan applications to show the usability of the CO₂P₃S system and its ability to reduce programming effort, while producing programs with reasonable performance.     

低压欠平衡钻井--勘探钻井中技术发展新动向(续)

介绍了国外欠平衡钻井的发展与应用,以及目前存在的主要问题。在此基础上提出了低压欠平衡钻井技术系列,它是一套特殊工作液（气体、充气液、特殊泡沫、低密度液体）、特殊压力控制（平衡、欠平衡、过平衡）、低液柱压力与特殊屏蔽暂堵相结合的技术。     

基于工科院校背景的财务管理专业建设思路与措施

财务管理本科专业始建于1998年的财经类高校,随着社会经济发展和企业管理的需要,综合性大学和工科院校也先后设置了财务管理本科专业。针对财务管理本科专业的人才培养,不同类型高校都进行了有益的探索,由于办学背景的不同,各个高校制订的财务管理本科专业人才培养方案应具有明显差异。如何体现工科院校办学背景,彰显财务管理本科专业建设的特色,是值得工科院校财务教育专家深入研究的。本文在分析工科院校办学特色的基础上,提出了工科院校财务管理本科专业建设思路与相关措施。     

浅析我国煤炭资源发展现状

煤炭是我国的主要能源,是国民经济和社会发展不可缺少的物资基础。随着日本核事故的发生,核电发展＂被＂放缓,而全球煤炭需求将增长。本文主要介绍了煤炭资源在我国国民经济中的需求状况,分析了煤炭产业在我国发展中所面临的一些问题,并提出了煤炭产业发展的一些建议。     

生产一线创建学习型党组织应解决的几个问题

在油田进一步推进学习型党组织建设的进程中,要通过明确学习目标,采取正确的学习方式方法,并与实践工作紧密结合,从而解决生产一线单位学习动力不足、工学矛盾突出、学以致用不够等问题。     

A New Algorithm To Solve Vehicle Routing Problems (VRPs)

Efficient Resource management has a direct influence on business performance and profitability. Vehicle Routing Problems (VRPs) considered in this paper are resource management problems where the aim is to use the limited number of resources to a large number of jobs so that the maximum number of jobs can be completed with minimum cost. A VRP consists of a workforce of maintenance engineers and a set of geographically distributed customers requiring certain services. The problem is complicated by incorporating certain technological and temporal constraints. The objective is to maximize the amount of work done measured in terms of total number of jobs completed and to minimize the total distance travelled by all the engineers. The solution to a VRP is a list of engineers and for each engineer a tour consisting of an ordered list of services to be completed by him under the given constraints. These Problems belong to the class of NP-Complete problems. The stochastic techniques such as Hill-Climbing (HC), Tabu Search (TS), Genetic Algorithms (GA) and Simulated Annealing (SA) are found to be suitable for solving these problems efficiently. It is found empirically that out of these SA gives good results for VRPs. But in some cases it also gives poor quality results. This happens due to not allocating intelligently the unallocated jobs in SA in subsequent iterations. A new algorithm is proposed to solve VRPs in this paper. This is achieved by allocating unallocated jobs intelligently in SA. The proposed algorithm is tested empirically on a number of randomly generated VRPs. Three types of VRPs considered are over resourced, under resourced and critically resourced VRPs. In almost all cases, the proposed algorithm completes a large number of jobs with minimum cost in comparison with SA.