最小差距最大化组合赋权的软件服务外包产业核心竞争力评价模型及实证

正确评价我国软件服务外包产业核心竞争力并提取关键影响因素,有利于找出产业发展中存在的问题,也为制定产业发展政策提供可靠依据。根据产业核心竞争力内涵,基于钻石模型,构建了软件服务外包产业核心竞争力评价指标体系,通过评价值最小差距最大化组合赋权方法计算多种权重的组合权重,并对我国典型的18个城市软件服务外包产业核心竞争力进行实证分析。最小差距最大化组合赋权模型消除了在不同赋权方法下评价排序不一致的缺陷,并最大程度地区分了评价结果之间的差距,提高了评价结果的科学性和可靠性     

一种用于立体供热管网的水力计算方法

为了充分利用新能源的节能潜力,需要提高供热管网模型在非对称、非规则拓扑结构的管网上进行水力计算的能力.本文提出一种立体管网建模方法.该方法无需基于图论搜索基本回路,能够在三维非对称、非规则拓扑结构上直接对热网进行水力工况分析.将该方法与传统方法的建模过程进行详细的比较,并通过具体案例计算验证方法的有效性.     

基于多叉树的梯形图向指令表转换算法

针对目前可编程逻辑控制器（PLC）编辑软件中梯形图向指令表转化算法的缺陷,通过对梯形图语言的分析与研究,并考虑到梯形图和指令表在实际应用时的优劣点,提出了一种借助多叉树来实现PLC梯形图向指令表转换的算法。该算法采取从左至右,从上至下的扫描原则将梯形图构建成多叉树,借助多叉树来反应图符间的逻辑关系,然后通过后序遍历多叉树来得到指令表程序。此算法在处理多重串并联结构梯形图时具有更高的效率,同时适用于堆栈指令,使得该算法具有更好的通用性。     

Investigation of Cyber-Security and Cyber-Crimes in Oil and Gas Sectors Using the Innovative Structures of Complex Intuitionistic Fuzzy Relations

Recently, there has been enormous development due to advancements in technology. Industries and enterprises are moving towards a digital system, and the oil and gas industries are no exception. There are several threats and risks in digital systems, which are controlled through cyber-security. For the first time in the theory of fuzzy sets, this research analyzes the relationships between cyber-security and cyber-crimes in the oil and gas sectors. The novel concepts of complex intuitionistic fuzzy relations (CIFRs) are introduced. Moreover, the types of CIFRs are defined and their properties are discussed. In addition, an application is presented that uses the Hasse diagram to make a decision regarding the most suitable cyber-security techniques to implement in an industry. Furthermore, the omnipotence of the proposed methods is explained by a comparative study.     

Development of high bio‐content polypropylene composites with different industrial lignins

Sustainability, eco‐efficiency, pollution prevention, industrial ecology, and green chemistry are considering platform‐based approaches to the development of the next generation of products and processes. Recently, renewable alternatives to traditional petroleum‐derived plastics have motivated recent interest in bio‐based composite materials which can contribute to the reduction of the environmental footprint. Lignin is a complex and amorphous biopolymer with a high density of functional groups and high modulus, which makes it potentially promising for material applications. In this sense, lignin can potentially be employed to improve the performance of materials and an economical alternative to convert lignin into high value‐added materials. Two different types of Kraft lignin were incorporated into polypropylene to fabricate composites with high bio‐content. In this study, polypropylene, Kraft lignin, and coupling agent were subjected to reactive extrusion. The composites prepared by melt processing were compared in terms of morphological, mechanical, and thermal characterizations. The results revealed that the incorporation of lignin into polypropylene matrix resulted in composites with properties suitable for various industrial sectors, especially those in which mechanical and thermal properties are crucial, such as the replacement of engineering plastics and polypropylene mineral filled. As a result, this work provides an effective way of using lignin as a low‐cost bio‐renewable resource in the plastics industry.     

电信行业结构的演化分析

应用产业组织理论和Pakes-McGuire模型,仿真计算并比较了我国电信改革前的自然垄断的行业结构和引入竞争机制后的市场结构的演化,从产业结构演化的角度证实了电信行业中引入竞争机制的必要性.     

房地产开发活动均衡分析与过度开发行为控制

在把房地产投资开发项目看作为一种具有弱再生性经济资源的基点上,对房地产投资开发活动进行了均衡分析,讨论了房地产开发活动中的最优平衡解及其相互之间的制约关系,分析了税收和配额价格等经济参数对最优平衡解的影响,给出了抑制房地产过度投资开发行为的控制模型与方法,并得出了相应的政策启示.这些研究结果,可以推广应用于其他各种可再生资源的投资开发与管理当中去,有着广泛的应用前景.     

Investigating purchasing-sequence patterns for financial services using Markov, MTD and MTDg models

In the past, several authors have found evidence for the existence of a priority pattern of acquisition for durable goods, as well as for financial services. Its usefulness lies in the fact that if the position of a particular customer in this acquisition sequence is known, one can predict what service will be acquired next by that customer. In this paper, we analyse purchase sequences of financial services to identify cross-buying patterns, which might be used to discover cross-selling opportunities as part of customer relationship management (CRM). Hereby, special attention is paid to transitions, which might encourage bank-only or insurance-only customers to become financial-services customers. We introduce the mixture transition distribution (MTD) model as a parsimonious alternative to the Markov model for use in the analysis of marketing problems. An interesting extension on the MTD model is the MTDg model, which is able to represent situations where the relationship between each lag and the current state differs. We illustrate the MTD and MTDg model on acquisition sequences of customers of a major financial-services company and compare the fit of these models with that of the corresponding Markov model. Our results are in favor of the MTD and MTDg models. Therefore, the MTD as well as the MTDg transition matrices are investigated to reveal cross-buying patterns. The results are valuable to product managers as they clarify the customer flows among product groups. In some cases, the lag-specific transition matrices of the MTDg model give better insight into the acquisition patterns than the general transition matrix of the MTD model.     

Acyclic list 7‐coloring of planar graphs

The acyclic list chromatic number of every planar graph is proved to be at most 7. © 2002 Wiley Periodicals, Inc. J Graph Theory 40: 83–90, 2002     

Coloring graphs from lists with bounded size of their union

A graph G is k‐choosable if its vertices can be colored from any lists L(ν) of colors with |L(ν)| ≥ k for all ν ∈ V(G). A graph G is said to be (k,?)‐choosable if its vertices can be colored from any lists L(ν) with |L(ν)| ≥k, for all ν∈ V(G), and with . For each 3 ≤ k ≤ ?, we construct a graph G that is (k,?)‐choosable but not (k,? + 1)‐choosable. On the other hand, it is proven that each (k,2k ? 1)‐choosable graph G is O(k · ln k · 2^4k)‐choosable. © 2005 Wiley Periodicals, Inc. J Graph Theory