论加强经营性公路建设资金监管的基本思路

加强对经营性公路建设资金的监管,对提高有限资金的使用效益具有重要的作用.以16家公路上市公司的股本结构为例说明了国家投入公路经营企业的交通基本建设资金是公路经营企业资本金的主要组成部分;并在此基础上提出了加强对经营性公路建设资金监管的基本思路.     

企业财务状况与投资者关系管理--来自 IR 百强上市公司的经验证据

依据“2007年度中国最佳投资者关系管理百强”榜的评选结果,研究了企业财务状况对上市公司投资者关系管理的影响.结果表明,投资者关系管理与企业盈利能力负相关,与股东获利能力、发展能力以及企业现金流量能力正相关.研究还发现,公司规模和流通股比例有利于提升投资者关系管理水平.     

Comments on the Paper: Attacking the Market Split Problem with Lattice Point Enumeration

We present a few comments on the paper Attacking the market split problem with lattice point enumeration by A. Wasserman, published in Journal of Combinatorial Optimization, vol. 6, pp. 5–16, 2002.     

On Combinatorial Approximation of Covering 0-1 Integer Programs and Partial Set Cover

The problems dealt with in this paper are generalizations of the set cover problem, min{cx | Ax b, x {0,1}ⁿ}, where c Q₊ⁿ, A {0,1}^{m × n}, b 1. The covering 0-1 integer program is the one, in this formulation, with arbitrary nonnegative entries of A and b, while the partial set cover problem requires only m–K constrains (or more) in Ax b to be satisfied when integer K is additionall specified. While many approximation algorithms have been recently developed for these problems and their special cases, using computationally rather expensive (albeit polynomial) LP-rounding (or SDP-rounding), we present a more efficient purely combinatorial algorithm and investigate its approximation capability for them. It will be shown that, when compared with the best performance known today and obtained by rounding methods, although its performance comes short in some special cases, it is at least equally good in general, extends for partial vertex cover, and improves for weighted multicover, partial set cover, and further generalizations.     

股权分置改革与中国上市公司价值的提升

随着我国市场经济的发展,股权分置所带来的不利因素越来越成为政府、上市公司、投资者等社会各界不能回避的现实问题.自2005年起股权分置改革试点工作正式启动.上市公司是我国经济运行中最具发展优势的群体,股权分置改革对于提升上市公司核心竞争力和价值有着重要的意义.     

论改进我国上市公司股权结构的必要性和途径

建立有效的公司治理结构是现代企业制度的核心内容 ,本文分析了我国上市公司股权结构和治理结构存在的问题 ,提出从降低国有股权比例 ,培育寡头垄断型持股主体 ,发展证券投资基金等几个方面入手 ,改善上市公司的股权结构 ,促进有效的公司治理的建立     

Sequence Independent Lifting in Mixed Integer Programming

We investigate lifting, i.e., the process of taking a valid inequality for a polyhedron and extending it to a valid inequality in a higher dimensional space. Lifting is usually applied sequentially, that is, variables in a set are lifted one after the other. This may be computationally unattractive since it involves the solution of an optimization problem to compute a lifting coefficient for each variable. To relieve this computational burden, we study sequence independent lifting, which only involves the solution of one optimization problem. We show that if a certain lifting function is superadditive, then the lifting coefficients are independent of the lifting sequence. We introduce the idea of valid superadditive lifting functions to obtain good aproximations to maximum lifting. We apply these results to strengthen Balas' lifting theorem for cover inequalities and to produce lifted flow cover inequalities for a single node flow problem.     

国有企业(上市公司)改革的症结与对策

国有企业 (上市公司 )存在的问题如上市公司不规范、法人财产权难以落实、资本功能残缺、内部人控制等是由各种原因促成的。作者认为政府的不适当干预是其症结所在 ,进而提出建立健全证券法规体系 ,推进国家股和法人股的流通 ,规范政府在经济中的行为等治理对策     

房地产上市公司财务预警实证研究

房地产业已成为我国重要的支柱产业,因此,建立房地产上市公司财务预警方法对政府、投资商、中介公司和广大消费者都具有重要意义。以主成分分析和逻辑回归分析为基础建立分析模型,并用该模型对2002~2005年沪、深两市45家房地产业上市公司进行实证分析,发现模型对房地产上市公司前两年和前四年的财务预警有较高的可信度。     

On Integer Programming Approaches for Morphological Template Decomposition Problems in Computer Vision

In morphological image processing and analysis, a template or structuringelement is applied to an image. Often savings in computation time and abetter fit to the given computer architecture can be achieved by using thetechnique of template decomposition. Researchers have written a multitude ofpapers on finding such decompositions for special classes of templates.Justifying recent integer programming approaches to the morphologicaltemplate decomposition problem in its general form, this paper proves theNP-completeness of this problem.