On the NEH heuristic for minimizing the makespan in permutation flow shops

Over the last 20 years the NEH heuristic of Nawaz, Enscore, and Ham published in this journal has been commonly regarded as the best heuristic for minimizing the makespan in permutation flow shops. In recent years some authors claimed to develop new heuristics that are competitive or outperform NEH. Our study reveals that these claims are not justified. We also address the issue of a fair comparison of the NEH results with those obtained by metaheuristics. Finally we conduct a thorough analysis of NEH leading to its modification which secures the optimality in the two-machine case and improves the general performance.     

Child Survival and Fertility of Refugees in Rwanda

In the 1960s and 1990s, internal strife in Rwanda has caused a mass flow of refugees into neighbouring countries. This article explores the cumulated fertility of Rwandan refugee women and the survival of their children. To this end, we use a national survey conducted between 1999 and 2001 and covering 6,420 former refugee and non-refugee households. The findings support old-age security theories of reproductive behaviour: refugee women had higher fertility but their children had lower survival chances. Newborn girls suffered more than boys, suggesting that the usual sex differential in child survival observed in most populations changes under extreme living conditions.     

Power of the Neyman Smooth Test for Evaluating Multivariate Forecast Densities

We compare and investigate Neyman's smooth test, its components, and the Kolmogorov-Smirnov (KS) goodness-of-fit test for testing the uniformity of multivariate forecast densities. Simulations indicate that the KS test lacks power when the forecast distributions are misspecified, especially for correlated sequences of random variables. Neyman's smooth test and its components work well in samples of size typically available, although there sometimes are size distortions. The components provide directed diagnosis regarding the kind of departure from the null. For illustration, the tests are applied to forecast densities obtained from a bivariate threshold model fitted to high-frequency financial data.     

ENTREPRENEURIAL SOCIAL INFRASTRUCTURE AND LOCALLY INITIATED ECONOMIC DEVELOPMENT IN THE NONMETROPOLITAN UNITED STATES

A community embeddedness perspective hypothesizes that nonmetropolitan localities high on entrepreneurial social infrastructure (ESI) are more successful at implementing economic development projects than those lacking ESI. ESI is a format for converting social capital into organizational forms that facilitate collective action. Logistic regression revealed that localities with projects were more likely to have an unbiased newspaper, multiple contributions by financial institutions to community projects, and more external linkages, Project communities place more emphasis on citizen involvement through civic organizations than through local government. Community-based patterns of interactions and organization are associated with successful collective economic development action.     

斯柯达转型之谜

在很长的一段时间里，总部位于捷克的斯柯达都是一家名不见经传的公司，可就在不到15年的时间里，这家公司便实现了转型，从一个行业笑料发展成了一家颇受尊重的汽车巨头。秘诀何在？答案是：质量，知识转移，资本价值，时机把握，上市速度。     

An exploratory study of the relation between concrete and abstract product attributes

It is argued that the abstract product attributes that consumers mention in a research setting should not be interpreted as combinations of the more concrete attributes consumers mention. Results from a laddering study show that a majority of elicited abstract product attributes are unrelated to concrete attributes. Furthermore, these unrelated abstract attributes are about different product aspects than the related abstract attributes. These findings are discussed in the light of the problem of ‘actionability', and of models for new product development.     

How Integrated are Finns in the Swedish Labour Market? Outcomes of Free Labour Mobility

DANS QUELLE MESURE LES FINLANDAIS SONT-ILS INTÉGRÉS AU MARCHÉ DU TRAVAIL SUÉDOIS ? RÉSULTATS DE LA LIBRE MOBILITÉ DE LA MAIN-D'OEUVRE
En raison d'un accord instituant un marché commun nordique du travail, les Finlandais constituent, depuis des décennies, le plus grand groupe d'immigrés en Suède. Pourtant, rares sont les études qui ont spécifiquement tenté de déterminer dans quelle mesure ils sont intégrés au marché du travail. Cet article vise à combler en partie cette lacune en examinant comment les Finlandais ont réussi avant et après la crise économique des années 90. Les niveaux d'emploi et les salaires des immigrés finlandais dans la force de l'âge sont comparés à ceux des Suédois de souche à l'aide d'échantillons représentatifs de la population totale de 1990 et 2001. Nous cherchons à déterminer dans quelle mesure tout écart peut être attribuéà de simples facteurs de base tels que l'âge, le sexe, le niveau d'éducation et la région de résidence. D'après nos constatations, les salaires et niveaux d'emploi des Finlandais de sexe masculin sont environ 10% moins élevés que ceux des Suédois de souche et cet écart tend à devenir plus marqué au fil du temps. Il existe toutefois des variations considérables entre les cohortes d'immigrés, et les différences de niveaux d'éducation ne jouent un rôle significatif qu'en ce qui concerne les écarts de salaire. Les Finlandaises semblent en revanche mieux intégrées, leurs résultats sur le marché du travail étant très semblables à ceux des Suédoises de souche.     

Social Capital and Communities of Place1

Abstract This paper develops a framework for examining the questions: Does social capital make a difference for well being in communities of place? How might rural sociologists utilize social capital to further well being in communities? The author reviews social capital literature, contrasting rational choice and embeddedness perspectives. Opting for a marriage between embeddedness and conflict theory, he introduces entrepreneurial social infrastructure (ESI) as an alternative to social capital. ESI adds to social capital the notions of equality, inclusion, and agency. Research results are presented which support the embeddedness approach: community-level action (the community field) is not simply an aggregation of individual or organizational actions within the community; social capital and ESI contribute jointly and independently to community action. Examining economic development as a form of collective action, the author concludes?the following: a) ESI contributes to economic development, and b) inclusiveness (internal solidarity) is more closely related to community self-development while industrial recruitment is better predicted by strong external ties.     

A longitudinal analysis of household and nonhousehold living arrangements in later life

Most explanatory models of living arrangements in later life link the decision process surrounding choice of living arrangement to personal resources such as income and health. Applications of these models, however, are based for the most part on cross-sectional rather than longitudinal data. In this paper we examine living arrangements in later life among the nonmarried population aged 55 and over, using data from the Survey of Income and Program Participation. We observe individuals as they change living arrangements, die, or become institutionalized. Our results suggest that economic resources dominate the decision-making process in transitions across different household arrangements, whereas health is most important in explaining institutionalization.