A Unified Approach to the Characterization of Equivalence Classes of DAGs, Chain Graphs with no Flags and Chain Graphs

Abstract.  A Markov property associates a set of conditional independencies to a graph. Two alternative Markov properties are available for chain graphs (CGs), the Lauritzen–Wermuth–Frydenberg (LWF) and the Andersson–Madigan– Perlman (AMP) Markov properties, which are different in general but coincide for the subclass of CGs with no flags . Markov equivalence induces a partition of the class of CGs into equivalence classes and every equivalence class contains a, possibly empty, subclass of CGs with no flags itself containing a, possibly empty, subclass of directed acyclic graphs (DAGs). LWF-Markov equivalence classes of CGs can be naturally characterized by means of the so-called largest CGs , whereas a graphical characterization of equivalence classes of DAGs is provided by the essential graphs . In this paper, we show the existence of largest CGs with no flags that provide a natural characterization of equivalence classes of CGs of this kind, with respect to both the LWF- and the AMP-Markov properties. We propose a procedure for the construction of the largest CGs, the largest CGs with no flags and the essential graphs, thereby providing a unified approach to the problem. As by-products we obtain a characterization of graphs that are largest CGs with no flags and an alternative characterization of graphs which are largest CGs. Furthermore, a known characterization of the essential graphs is shown to be a special case of our more general framework. The three graphical characterizations have a common structure: they use two versions of a locally verifiable graphical rule. Moreover, in case of DAGs, an immediate comparison of three characterizing graphs is possible.     

WTO《TRIPS协议》下中国知识产权法制完善问题研究

中国入世 ,国内法律必须与 WTO规则一致 ,有关知识产权方面的法律也不例外。为此 ,在阐述我国现行有关知识产权立法与实践及其与 TRIPS协议的差距的基础上 ,全面系统地论述了我国完善知识产权法制的对策。     

知识产权制度中的利益平衡原则

利益平衡是知识产权制度追求的价值目标。利益平衡原则的提出根源于知识产与有形财产的自然属性以及知识产权与有形财产权在性质上的差异,知识产权制度中更多地体现出法律的控制。庞德将法律视为协调利益冲突手段的社会利益学说为利益平衡原则提供了法哲学上的基础。而在把知识产权界定为私权的同时对产权交易进行规制,这两方面共同作用所带来的经济学上的效益最大化则为利益平衡原则提供了经济学上的基础。     

论企业的联合产权制度性质

企业是一个以资源、能力与知识为基础的由要素所有者联合与劳动所有者联合相结合以创造、控制、分配 合作剩余的专业化生产性组织。联合产权制度是现代企业制度的普遍形式,也是现代企业制度的根本性质。     

"债务随企业资产转移"原则之管窥

“债务随企业资产转移”原则是国企改制后判断和识别债务承担的重要司法原则。然而该原则并不科学。从规范分析和实证分析的角度，对该原则进行了适法性和妥当性剖析，以求有助于国企改制的司法实践。     

我国农地所有权制度的变迁与创新

历史上,我国农地经历了从原始公有制向国有制再到私有制的变迁,而建国后则经历了从耕者有其田到集体所有的变迁。文章运用新制度经济学理论对我国农地所有权制度的变迁作了分析,并为《物权法》的制定、当前集体农地所有权制度创新提出了建议。     

非退化扩散过程极性的充分条件

讨论了多维非退化扩散过程样本轨道的性质,得到了其极性的充分条件     

A Macro-Economic Framework for Evaluation of Cyber Security Risks Related to Protection of Intellectual Property

The article is based on the premise that, from a macro-economic viewpoint, cyber attacks with long-lasting effects are the most economically significant, and as a result require more attention than attacks with short-lasting effects that have historically been more represented in literature. In particular, the article deals with evaluation of cyber security risks related to one type of attack with long-lasting effects, namely, theft of intellectual property (IP) by foreign perpetrators. An International Consequence Analysis Framework is presented to determine (1) the potential macro-economic consequences of cyber attacks that result in stolen IP from companies in the United States, and (2) the likely sources of such attacks. The framework presented focuses on IP theft that enables foreign companies to make economic gains that would have otherwise benefited the U.S. economy. Initial results are presented.     

不同主体股权转让问题探讨

在法律实践中,隐名投资作为一种非常规的投资方式,其所引起的纠纷除了涉及隐名股东与名义持股人内部协议履行的问题,亦有隐名股东、名义持股人因公司经营或股权利益分配导致的与公司或第三人之间的纠纷。本文基于最新的《公司法》司法解释三,对隐名股权的转让问题进行分析;同时,股权基于其财产权的属性可作为夫妻之间的共同财产,但法律和司法解释均未对夫妻之间在离婚阶段难以协商一致时如何认定股权归属和收益归属问题进行规定,本文将对若干可能情况下的该问题进行法理上的阐释。     

论免费软件经营者的法定和契约义务及其法律规制

随着互联网开放共享精神的发展、计算机软件开发技术的改进,以及软件经营商业模式的改变,免费软件越来越多地呈献给广大互联网用户,随之也带来了更多的知识产权纠纷,侵犯个人隐私以及不正当竞争行为时有发生.软件免费经营如何实现盈利,根据权利义务对等原则,软件免费是否意味着软件经营者就无需承担义务？文章主要阐述了免费软件概念、内涵、盈利途径及法律性质,并通过对免费软件经营者的法定义务、契约义务的分析论证,提出有效的法律规制建议.