回弹模拟精度的主要影响因素

板料成形过程中普遍存在着回弹问题,特别在弯曲和浅拉深过程中回弹现象更严重,在板料成形领域,回弹已成为模具设计中要考虑的关键问题。本文从成形过程模拟和回弹过程模拟两方面对影响回弹模拟精度的主要因素进行了研究,指出限制回弹模拟精度提高的重要因素和提高回弹模拟精度的主要措施。     

Lattice path combinatorics for multiple product identities

Lattice paths are enumerated as walks on a lattice under the Delannoy criterion of vertical, horizontal and upward diagonal steps. Delannoy recursions are generalized for arbitrary weights in each of these directions, where the row elements of the Delannoy triangles correspond to lattice paths for all walks at a given length.     

推进公共服务均等化途径研究

党的十七大明确提出,"围绕推进基本公共服务均等化,完善公共财政体系。""建设服务型政府,完善公共服务体系,强化社会管理和公共服务。"从而为全面落实科学发展观,加强改善民生,推进公共服务均等化,建设公共服务网络体系指明了方向。从全面落实科学发展观战略视角,对加强改善民生、推进公共服务均等化实现途径的现状、挑战、机遇和路径进行初步的研究,以进一步提高贯彻落实科学发展观和党的路线方针政策的自觉性和坚定性,增强实现党的根本宗旨的责任感和使命感。     

Open Review of Science Publications

Publication of scientific research in print is traditionally peer reviewed anonymously prior to publication, which is a time-tested process but has serious limitations. The advent of the Internet permits postpublication open review online after minimal review by the editors or the author-selected reviewers, which can be quick, that permits the authors to revise the content. Most meritorious articles published online may be selected for publication in print as annual or biennial collections.     

1969年前后美国改变对华遏制政策的理论基础与路径选择

1969年前后,国际冷战格局出现了美守苏攻态势,美国政府和领导人从国家利益出发迅速改变对华遏制政策,意图利用中国因素抗衡苏联。美国联合中国抗衡苏联的外交政策改变了国际冷战格局,影响十分深远。     

基于人文的现代营销行为

随着商品经济的发展和市场竞争的加剧，发达的商品经济以其高雅文化的面貌征服了人们的情感，表现为一种双赢的商品交易与极具亲和力的现代营销——“人文营销”。它使企业以人文要素为中心展开营销活动，通过营销整合，营造强烈的人文氛围，重视企业与企业之间、企业与消费者之间的良性沟通及人文关怀，强化竞争及交易双方的亲和力，从而实现有效营销。     

高校学生工作要代表学生的根本利益

揭示高校学生工作代表学生根本利益的内涵 ,提出了高校学生工作代表学生根本利益的有效途径 :建立健全一套有效的规章制度 ;用“三个代表”重要思想教育学生 ;着重培养学生的实践能力和创新能力 ;致力于校园文化的软件建设 ;树立新型的“服务观”。     

从"中体西用"到改革开放--中国现代化历程的回顾与思考

自十九世纪中叶起,探索救国与强国之路,是摆在中国人面前的一个重大课题。本文从思想认识演化的角度,纵线条观察分析了从现代洋务运动到今天改革开放,中国人对现代化的认识过程,以期得到一些有益的历史借鉴和思想启迪。     

A Genetic Algorithm for the Weight Setting Problem in OSPF Routing

With the growth of the Internet, Internet Service Providers (ISPs) try to meet the increasing traffic demand with new technology and improved utilization of existing resources. Routing of data packets can affect network utilization. Packets are sent along network paths from source to destination following a protocol. Open Shortest Path First (OSPF) is the most commonly used intra-domain Internet routing protocol (IRP). Traffic flow is routed along shortest paths, splitting flow at nodes with several outgoing links on a shortest path to the destination IP address. Link weights are assigned by the network operator. A path length is the sum of the weights of the links in the path. The OSPF weight setting (OSPFWS) problem seeks a set of weights that optimizes network performance. We study the problem of optimizing OSPF weights, given a set of projected demands, with the objective of minimizing network congestion. The weight assignment problem is NP-hard. We present a genetic algorithm (GA) to solve the OSPFWS problem. We compare our results with the best known and commonly used heuristics for OSPF weight setting, as well as with a lower bound of the optimal multi-commodity flow routing, which is a linear programming relaxation of the OSPFWS problem. Computational experiments are made on the AT&T Worldnet backbone with projected demands, and on twelve instances of synthetic networks.