CRIME AND POVERTY: A SEARCH‐THEORETIC APPROACH*

Numerous studies document that criminal activity is positively related to unemployment and negatively related to educational attainment levels within given communities. We study this phenomenon in the context of a search‐equilibrium model, in which agents choose between formal employment and pursuing crime‐related activities (theft). Prior to their “occupational choices,” agents undertake costly schooling, raising their productivity. Crime acts, in essence, as a tax on human capital by affecting the probability that a worker's earnings (possessions) are subsequently appropriated. There are multiple equilibria. High crime, low levels of educational attainment, long spells of unemployment, and poverty are correlated across them.     

The Contingent Value of Responsive and Proactive Market Orientations for New Product Program Performance*

While the benefits of being market oriented are largely accepted, a group of scholars and managers remain skeptical. Marketing scholars have sought to counter the criticisms leveled against market orientation (MO) by arguing that it has both responsive and proactive dimensions. However, few studies have empirically examined the complexity of the effects of these dimensions on firm performance. Drawing on theories of resource‐based advantage and organizational search behavior, this article advances understanding by arguing that responsive and proactive market orientations have curvilinear effects on product development performance, that their interaction may be positively related to product development performance, and that their effects on new product program performance are moderated differentially by the organizational implementation conditions and marketing function power. Survey results of 175 U.S. firms indicate support for most of the hypotheses. Specifically, whereas responsive MO has a U‐shaped relationship with new product program performance, proactive MO has an inverted U‐shaped relationship with new product program performance. Contrary to the arguments presented here, the interaction of both orientations is negatively related to new product program performance. This study finds that both orientations are needed; however, new product program performance is enhanced when one is at higher level and the other is at lower level. Finally, responsive MO is only positively related to new product program performance under specific conditions such as when strategic consensus among managers is high. On the other hand, the positive effect of proactive MO on new product program performance is further strengthened when learning orientation and marketing power are high. Overall, this study suggests that the effects of responsive and proactive MO on new product program performance are more complex than previously theoretically argued and empirically examined.     

Feature selection methods involving support vector machines for prediction of insolvency in non‐life insurance companies

We propose two novel approaches for feature selection and ranking tasks based on simulated annealing (SA) and Walsh analysis, which use a support vector machine as an underlying classifier. These approaches are inspired by one of the key problems in the insurance sector: predicting the insolvency of a non‐life insurance company. This prediction is based on accounting ratios, which measure the health of the companies. The approaches proposed provide a set of ratios (the SA approach) and a ranking of the ratios (the Walsh analysis ranking) that would allow a decision about the financial state of each company studied. The proposed feature selection methods are applied to the prediction the insolvency of several Spanish non‐life insurance companies, yielding state‐of‐the‐art results in the tests performed. Copyright © 2005 John Wiley & Sons, Ltd.     

国家助学贷款的饮坷之路

全国高校2005年度录取工作已经结束了，寒窗苦读十几载的学子们有的名落孙山，有的鲤鱼跳过了龙门。然而，就在这些挤过独木桥的幸运儿中，有敲锣打鼓、兴高采烈者，亦有因交不起学费而偷偷落泪者。几家欢喜几家忧，穷人家的孩子只能眼巴巴地盼着国家的助学贷款。而备受瞩目的国家助学贷款一路走来，前景又如何？     

全低变工艺开发应用中的问题与对策

讨论了全低变工艺开发过程中遇到的一些问题和对策,对中、小氮肥企业进行技术改造具有一定的参考意义。     

Artificial neural networks with feature transformation based on domain knowledge for the prediction of stock index futures

A feature transformation method based on domain knowledge for arti?cial neural networks (ANNs) is proposed. The method of feature transformation based on domain knowledge converts continuous values into discrete values in accordance with the knowledge of experts in speci?c application domains. This approach effectively ?lters data, trains the classi?er, and extracts the rules from the classi?er. In addition, it reduces the dimensionality of the feature space, which not only decreases the cost and time in the operation but also enhances the generalizability of the classi?er. The experimental results of the proposed approach will be compared and tested statistically with the results of the linear transformation method. The results show that the method of feature transformation based on domain knowledge outperforms the linear transformation in modelling of ANNs. Copyright © 2004 John Wiley & Sons, Ltd.     

活性污泥法降解苯酚模拟废水的动力学研究

研究了活性污泥法降解苯酚模拟废水的动力学规律。实验结果表明，活性污泥法对苯酚废水具有良好的降解性能，正常状态下，3h内COD去除率迭90％以上。降解过程符合一级反应动力学方程。不同污泥浓度时反应速率常数K1相差不大，提高苯酚初始浓度K1亦增大。pH值在4．8-9．1范围内，活性污泥保持良好的降解性能，pH值过大或过小时，微生物均受到抑制。在15-35℃，K-随温度的升高而增大，求得温度系数θ为1．054。     

The service sector of Cuba: An analysis and critique

The Cuban economy has experienced a significant increase in foreign direct investment over the past decade due to the end of the Soviet Union and the establishment of more liberal trade policies. Although the U.S. embargo of trade with Cuba still exists, there has been movement lately that suggests the end of the four‐decades‐old policy. The purpose of this article is to analyze the current Cuban business environment and to identify potential entrepreneurial opportunities in the service sector. Major trade partners are also reviewed and managerial implications discussed. © 2006 Wiley Periodicals, Inc.     

信息不对称条件下的中国零售业营销研究

一、信息不对称条件下中国零售业的营销困难 信息不对称给中国零售业营销带来了困难。那么，这些困难是什么？其具体表现形式又是怎样的呢？让我们逐一考察。     

悬浮床加氢裂化工艺技术经济分析

介绍了重油悬浮床加氢裂化工艺的最新发展，对国内新开发的悬浮床加氢裂化工艺特点作了介绍。并将悬浮床加氢和三种重油轻质化工艺——固定床加氢、延迟焦化、重油催化裂化在技术经济上作了分析对比。在原油品质越来越差的今天，针对劣质重油而开发的的悬浮床加氢裂化工艺具有非常广阔的应用前景。