基于改进的Hopfield离散神经网络的模式识别

本文介绍基于改进的Ｈｏｐｆｉｅｌｄ离散神经网络（ＩＨＤＮ）的模式识别。当一个要求存贮在网络中的模式输入时，我们计算它与其它模式的类似测试，并把类似测试在网络综合中加以考虑。当输入任一矢量时，由于网络的联想能力，该矢量将进化到与它距离最近的一个存贮模式中。理论分析和实验仿真结果表明，ＩＨＤＮ比原Ｈｏｐｆｉｅｌｄ离散神经网络（ＨＤＮ）有更大的存贮容量和更强的联想能力。     

BP神经网络在地下水环境质量评价中的应用

基于模糊综合评判和灰色聚类法的不足,应用神经网络理论与方法建立地下水环境质量评价B—P网络模型,对磐石市的地下水进行评价,并与综合评价法的评价结果进行了比较。结果表明：用B—P神经网络模型评价地下水是可行的,该模型具有很强的学习、联想和容错功能,其分析结果和过程都接近人脑的思维过程和分析方法．使得地下水评价结果的精度大大提高。     

基于时滞网络的ANN系统辨识方法研究

人工神经网络（ANN）简称神经网络，属于模仿人类思考过程的一类普通的人工智能。人类大脑皮层包含的上亿个神经元互相连接构成了生物神经网络．而ANN就是通过电子电路或者计算机程序等有限的方法去模拟人脑的生物神经系统。它可以象人脑一样记忆和学习，通过对输入和输出样本数据的学习训练从而具备联想记忆能力．特别适用于解决传统的数字计算机难以处理的模式识别问题。其输入、输出映射关系是神经计算的核心。     

模式识别技术在贷款风险分类中的适用性分析

贷款风险分类是一个对借款人现金流量、财务指标及其非财务指标进行综合评价的过程。本文把贷款风险分类看作是一个模式识别问题,在此框架下,就统计模式识别领域中最新使用的神经网络方法、分类树法、以及支持向量机三种方法的建模思想、适用性进行分析,从而对我国贷款风险分类提供一些启示。     

模式识别技术在货款风险分类中的适用性分析

贷款风险分类是一个对借款人现金流量、财务指标及其非财务指标进行综合评价的过程.本文把贷款风险分类看作是一个模式识别问题,在此框架下,就统计模式识别领域中最新使用的神经网络方法、分类树法、以及支持向量机三种方法的建模思想、适用性进行分析,从而对我国贷款风险分类提供一些启示.     

神经网络在函数模拟中的应用

bp算法现在已成为目前应用最广泛的神经网络学习算法,它在函数模拟、模式识别和数据压缩等领域有着更加广泛的应用.神经网络已被广泛的应用到模式识别、信号处理、专家系统、组合优化和自动控制等领域.     

基于BP网络学习算法的英文字符识别

介绍了BP神经网络的基本原理,指出了BP算法收敛速度慢、易陷入局部及小值等缺陷,在标准BP算法的基础上引入了几种优化BP算法的方法。针对模式识别应用领域,通过实例,运用Matlab编程对各种较好的网络学习算法的性能进行比较,给出了一个三层BP网络识别含噪声的字母的实例。实验结果表明,改进的BP算法有效地提高了BP算法的收敛速度。     

基于最速下降算法BP神经网络及应用探讨

BP神经网络广泛的应用函数逼近、模式识别、分类、数据压缩等领域。给出了BP神经网络的经典学习算法——最速下降算法,并证明了该算法具有收敛到极小值的特性。最后将基于最速下降算法的BP神经网络应用于入侵检测,取得了良好的效果。     

系统集成厂商巡礼

本刊观察: 行业地位:领导厂商 综合评价:神州数码成立于2000年,由原联想科技发展有限公司、联想集成系统有限公司和联想网络有限公司整合而成,提供全方位电子商务基础建设产品、解决方案及服务。     

神经网络无序集合样本的构造

样本构造是神经网络应用的关键。经典的样本是元素与元素的对应关系。文章研究集合间的对应关系时,对如何构造样本,提出了一种集合构造样本的模式:将集合作为整体代入网络训练的模式,并应用实例"基于海明网的噪点数字图像识别"加以说明。提出"将无序集合按特定规律转化成有序集合,转化后的有序集合作为一个整体进行训练"。文章只解决了"有规律集合"这类集合——集合的神经网络集合样本构造,更一般化的样本构造问题仍有待解决。     

Channel Network Structure and the Product Assortment Function

Abstract

Although business networks provide value for many of their participants, the ability of network systems to perform product assortment functions is unclear. After raising several related research questions about network structure and product matching, this paper reviews some conceptual foundations of the network approach. In particular, the paper reviews and develops the distinction between network positions and distribution functions. It then assesses the functions performed within channel network structures in several published case studies. Some of these network structures exhibit low densities and closely resemble rather conventional vertical supply systems. It appears, though, that such more vertical networks perform a speculative matching function for product assortments when supply and demand are heterogeneous and volatile. Under more rigid and stable conditions, vertical networks may engage in product customisation to postpone product form. Horizontal networks (when they exist), may facilitate product standardisation and thus may contribute to beneficial diversities in supply.     

The impact of early imprinting on the evolution of new venture networks

Given the argued importance of networks to new ventures, this paper is intended to fill a noted gap in the literature pertaining to the factors that influence the evolution of new ventures' alliance networks. Drawing on the imprinting literature, we propose that one has to look beyond the first partner per se, and instead focus on the extant relationships the initial partner has with other firms. More specifically, we argue and find that the network size and centrality of a new venture's initial alliance partner influence the subsequent size of the new venture's network.     

Transformative service networks: cocreated value as well-being

Fundamental to emerging theories of value cocreation is a developing awareness that value emerges in networks. Service networks form to address issues for those in need, and value is conceived differently by the various constituents in the network. To represent this reality, a core service interaction, the reason for the construction of the network, is evaluated based upon a typology of value-creating interaction styles. Next, the potential impact on transformative value cocreation of various relationships in a service network is explored. To illustrate value cocreation from a network perspective, this paper develops research propositions assessing cocreated value in a health service network. Network factors regarding the structural and relationship properties of networks that advance the theory of value cocreation are proposed. Finally, suggestions for managers include ways to engage service network entities to enhance communication to foster a balanced, mutualistic relationship that optimizes cocreated value. Organizations need to better identify and activate customers' support networks in order to facilitate enhanced collaboration and communication.     

网络环境:面向未来的企业外部环境

网络环境是伴随着计算机技术和信息网络技术的迅速发展和广泛应用而逐步形成的。而企业的发展总是和外部环境的变化相互交织、相互作用的。在传统的工业经济环境向网络环境转变的过程中,企业和外部环境也是互动关系,企业要在正确认识外部环境的基础上制定发展战略、创造企业的内部环境。另外,企业作为整个开放系统的一个元素,又构成其他企业外部环境的一部分,从而对其他企业产生影响。     

Regional Trade Agreements and the Pattern of Trade: A Networks Approach

This paper uses a complex network approach for the analysis trade effects from regional trade agreements on world trade flows. We use bilateral trade data to compute the network community structure for every year between 1970 and 2000. We compare this to null community structures that emerge from various models based on regional and geographical classifications, the implementation of RTA's and gravity models of trade. Our results show that RTA formation appears to have a cyclical pattern on the world trade network community structure. We document periods where bilateral trade flows and the structure of the world trade network are consistent with those predicted by formation of RTAs. These cycles occur in 1980–86 and 1990–96. At the same time, we document periods in which the pattern in the world trade network is not explained by RTA formation. Two periods, 1986–90 and 1997–2000, show a pattern of bilateral trade flows that moves away from the prediction that results from assuming RTA formation as the driving force in the determination of the world trade network structure. Factors contributing to the latter parts of the cycle during our sample period include formation of regional trade networks in East Asia that account for a significant portion of world trade but are not formalised by RTAs in force.     

The perceived usefulness of knowledge supplied by foreign client networks

The network surrounding a firm's foreign clients has large influence on its ability to act in the market. How firms can utilize the knowledge supplied by client networks is therefore of great importance to their business with clients. Many studies show the usefulness of foreign clients and suppliers, whereas less attention has been given to the usefulness of knowledge supplied by clients’ network, such as clients’ clients, clients’ supplementary suppliers and competitors to the firm. This study contributes to international business research on networks by investigating the knowledge supplied by client networks for a firm doing business with a specific foreign client on a sample of 494 firms. A LISREL analysis demonstrates that knowledge supplied by client networks is more useful the more experienced the firm. Client networks are also more useful the more knowledge the firm has of its client, the more the firm needs knowledge of its clients and suppliers, the higher the cost of the client relationship, and the more standardized the product. A major conclusion is that the client network knowledge is more useful the further a firm's collaboration with the client, presumably as a result of the new, and more embedded business that the firm develops with the client. Implications are that client networks are resources that can be important competitive advantages for the internationalizing firm.     

The Effects of Learning on Relationship Value in a Business Network Context

ABSTRACT

In today's intense global competition, a firm's ability to learn from its networks of business relationships is an important source of sustainable competitive advantage. Learning in a network of relationships involves a constellation of resource linkages among business partners tied together by interconnected resources. This has the potential of increasing the relationship value of a firm in terms of knowledge created through interactions among firms in the business network. Prior research has not yet examined the effects of learning in and through relationships in a business network context. Interdependence of firms in business networks gives rise to learning effects of adaptation and coordination that can have implications for relationship value. An empirical study of 215 business relationships from a network of nine high-technology companies in the United Kingdom shows that learning in and through relationships as a result of interactions and resource interdependencies in networks of relationships has a positive effect on a firm's relationship value. Furthermore, an understanding of the network context through interactions among firms facilitates learning and development of the firm's learning capabilities that enhance relationship value.     

Embeddedness of innovation receivers in the multinational corporation: Effects on business performance

This paper investigates how relationship embeddedness in MNC subsidiaries’ corporate and external networks influences the contribution of innovation transfer to the recipient subsidiary's business performance. OLS regressions using data on the intra-MNC transfer of 224 innovations indicate that the embeddedness of a subsidiary's relationships in the corporate and external network positively affects the received innovation's contribution to business performance. More detailed analysis demonstrates that the positive link between a subsidiary's embeddedness in the external network and the contribution to business performance of receiving an innovation is negatively affected when the innovation is unique compared with other innovations on the market.     

浅析LEO卫星网络中的QoS路由问题

LEO卫星网络能够提供全球覆盖,为任何地点的用户提供适时应用服务。然而由于LEO的高速运动,LEO卫星网络的网络拓扑一直处于动态变化的过程中。文中首先分析了在这种动态变化的网络环境中QoS路由面临的新问题,接着提出了解决这些问题的几点考虑。     

Creating Shared Vision in the Marketing Channel Network

The marketing channel information network-composed of actors within the channel, activity links, and resource ties-is proposed to be a key element in creating an efficient marketing channel working environment. The shared vision for such channel networks is created by activity links between the actors, the learning mood of the channel, and by the channel's cultural foundation. Contingency-based intrachannel constraints are suggested to moderate the relationships between the channel's organizational arrangement and shared vision within the channel, and between shared vision and channel performance. To enhance theory and practice, this paper integrates the previous constructs into a marketing channel information network model and presents practical and actionable propositions.