一种求解装箱问题的混合算法

针对一维装箱问题,在考虑遗传算法早熟收敛问题和禁忌搜索算法自适应优点的基础上,将遗传算法和禁忌搜索法结合起来,提出了基于遗传和禁忌搜索的装箱优化算法,与简单遗传算法相比,该算法具有更好的收敛性能。最后通过实例验证了算法的有效性。     

两机器越库调度问题的模拟退火算法

研究两机器越库流水作业调度问题,其目标函数是最小化加权完工时间。首先,对算法参数进行分析,并针对所研究问题的特点对参数选取进行试验分析;其次,基于参数选取的数值分析结果,给出求解该问题的模拟退火算法;最后,通过数值实验进一步表明该算法的有效性。     

Structural Changes in the Labor Market and the Rise of Early Retirement in France and Germany

The rise of early retirement in Europe is typically attributed to the European system of taxes and transfers. A model with an imperfectly competitive labor market allows us to consider also the effects of bargaining power and of matching efficiency on pre‐retirement. We find that lower bargaining power of workers and declining matching efficiency have been important determinants of early retirement in France and Germany. These structural changes, combined with early retirement transfers and population aging, are also consistent with the employment and unemployment rates, labor share and seniority premia.     

The welfare costs of expected and unexpected inflation

The monetary search model by Lagos and Wright (2005) is extended with imperfect information about nominal shocks as in Lucas (1972). An analytical solution exists with logarithmic preferences. In general, individuals hold precautionary balances. Calibrated to United States postwar data, the welfare cost of the monetary cycle is calculated to be small (below 0.0003% of GDP) compared to the welfare cost of the inflation tax (around 0.25% of GDP). The main reason for the minute welfare cost of the monetary cycle is its low amplitude in 1947-2007. But, monetary crashes, such as those experienced during the Great Depression, can generate important welfare costs.     

Innovation objectives,knowledge sources,and the benefits of breadth

Given the inherent risk of innovative activity, firms can improve the odds of success by pursuing multiple parallel objectives. Because innovation draws on many sources of ideas, firms also may improve their odds of successful innovation by accessing a large number of knowledge sources. In this study, we conduct one of the first firm‐level statistical analyses of the impact on innovation of breadth in both innovation objectives and knowledge sources. The empirical results suggest that broader horizons with respect to innovation objectives and knowledge sources are associated with successful innovation. We do not find diminishing returns to breadth in innovation objectives, which suggests that firms may tend to search too narrowly. We interpret these results in light of well‐known cognitive biases toward searching in relatively familiar domains. Copyright © 2009 John Wiley & Sons, Ltd.     

External knowledge search,innovative performance and productivity in the Korean ICT sector

In recent years, Korea’s Information and Communication Technology (ICT) industry has grown rapidly. The prosperity of the ICT industry has brought growing recognition that rising productivity and innovative performance have made major contributions to ensuring competitive advantage in international markets. In this context, recent studies stress the importance of external knowledge for improving both innovative performance and productivity. This paper empirically investigates the effects of firms’ external knowledge search behavior on their productivity as well as their innovative performance in the Korean ICT manufacturing sector. Based on firm-level data from the Science and Technology Policy Institute (STEPI), this study indicates that incremental innovation and productivity are both related to external knowledge search.     

外部知识搜索策略对企业创新绩效的影响机制研究

快速创新使得企业外部知识搜索显得尤为重要,而不同的搜索策略会对企业产生不同的创新绩效。本文基于企业层面,从正式和非正式知识搜索视角出发,考察深度优先与宽度优先的知识搜索策略对企业创新绩效的影响机制,探讨关系嵌入性和知识缄默性在外部知识搜索策略影响企业创新绩效时的调节作用。以长三角地区161家企业为样本运用回归分析进行实证研究,结果表明：当关系嵌入性强时,深度优先的正式及非正式知识搜索策略对企业创新绩效的促进作用更大;当知识缄默性高时,宽度优先的正式知识搜索策略对企业创新绩效的促进作用更大。     

Simulated Attention-Tracking Methodologies: An Examination of Measurement Efficacy

This study introduces and examines a simulated attention-tracking methodology as an emerging technique to improve the study of in-store shopper behavior and decision making. To assess the viability of this new methodology, we examine its efficacy in producing consumer behavior data consistent with results predicted by the marketing literature. Empirical data across five grocery categories are used to examine the influence of personal, product, and situational differences on external information search. Findings show that the attention-tracking methodology is able to demonstrate expected results in almost all cases. The methodology is also able to provide a more complete view of external information search through tracing the observed search behavior preceding decision making. This proof of methodology responds directly to calls in the marketing and retailing literature to test new and emerging methodologies in support of research on in-store marketing and shopper behavior. Findings also provide managers with a methodology to examine the actual impact of marketing actions intended to capture shoppers’ attention at the retail shelf and to influence behavior.     

Why do not you read the label? – an integrated framework of consumer label information search

This article facilitates deeper insight into label‐related consumer information acquisition behaviour. An integrated framework of label information search (LIS) has been developed based on a synthesis of related literature and explorative research conducted by analysing online discussions among customers (netnography). The framework focuses on three main groups of personal factors that serve as antecedents of LIS: general personal factors (e.g. health consciousness and socio‐demographics), label‐related personal factors (e.g. label‐related self‐efficacy, trust in labels and the perceived usefulness of labels) and product category‐related personal factors (trust in food products, enduring involvement, experience and perceived quality differences). Important characteristics of the framework are its process‐oriented nature and the dynamically changing relationships among its concepts. LIS is an antecedent to and a consequence of influencing factors. This article offers managerial implications and serves to incite future inquiry in this field.