整数规划数学模型在人员委派问题上的应用

利用整数规划数学模型并结合快速算法,对某中介公司在人员委派问题上进行了研究和分析,在满足用人单位要求的情况下,合理安排现有工作人员,以期公司获得最大利润。     

Local Economic Structure and Growth

Abstract

This paper tests how the local economic structure—measured by local sector specialization, competition and diversity—affects growth of manufacturing sectors. Most of the empirical literature assumes that in the long run more productive regions will attract more workers and use employment growth as a measure of local productivity growth. However, this approach is based on strong assumptions, such as those of national labour markets and homogeneous labour. This paper shows that if we relax these assumptions, regional adjusted wage growth is a better measure of productivity growth than employment growth. This measure is used in order to study regional growth in Portuguese regions between 1985 and 1994. Evidence is found of MAR externalities in some sectors and no evidence of Jacobs or Porter externalities in most of the sectors. These results are at odds with the findings for employment-based regressions, which show that regional concentration and the region's size have a negative effect in most of the sectors. It is also shown that simply using regional wage growth would overstate the effect of regional concentration and competition on long-run growth.     

An Empirical Examination of the Role of Trust in Consumer and Supplier Relationship of Little Direct Contact: A Structural Equation Modeling Approach

In view of the growing interest in consumer trust, this article examines the determinants and consequence of trust in the relationship between business and consumers with little direct contact. By using structural equation modelling, a framework of consumer trust was developed, and the effect of trust and its determinants was assessed. The findings suggest that provision of trust information, integrity, and benevolence are crucial in building up trust, whereas competence affects trust building indirectly through the provision of trust information. Consumer trust was confirmed to have a positive effect on the consumer's intention for future purchase. Within the limitations of the study, the implications of these results are discussed and further research is suggested.     

Feeling good,feeling bad,and feeling at‐risk: a review of incidental affect's influence on likelihood estimates of health hazards and life events

The recent increased interest among researchers in the ways in which emotion, mood, and affect influence risk perceptions is an important step in better understanding how people understand and perceive health risk information. However, the literature involving incidental affect (ambient mood) is not as well known. The 23 years of research examining incidental affect's influence on likelihood estimates of health hazards and life events has not previously been integrated and examined critically. This comprehensive review found that incidental affect influenced likelihood estimates in a predictable way. Individuals experiencing positive affect made more optimistic likelihood estimates than did individuals experiencing negative affect. Individuals experiencing negative affect made more pessimistic likelihood estimates than did individuals experiencing positive affect. Anger was unique among negatively valenced emotions by influencing judgments in the same way as positive affect (i.e., relatively optimistic likelihood estimates). Three theoretical explanations are offered, including one that addresses the role of anger specifically.     

An Empirical Investigation of Audit Pricing in the Public Sector: The Case of Greek LGOs

This paper investigates the associations between audit pricing and multidimensional characteristics of local governments by using a sample of Greek municipalities. The Greek institutional setting is interesting because it is politically pluralistic. Moreover, independent auditors appointed through a bid process exclusively perform the audits. Our results suggest a considerable variation on audit fees which is mainly driven by politically related factors indicating the importance of relevant theoretical anticipations in audit pricing in the public sector. Agency costs appear strong enough to explain audit pricing. We also confirm prior findings on the significance of audit complexity and size. Results also suggest that audit fees are reduced when an internal team dedicated to accrual accounting is appointed. Therefore, our conclusions offer practical implications for policy setters and regulators in the public sector in relation to audit quality.     

Nonlinear dynamical structural equation models

Structural equation models (SEMs) have been widely used in behavioural, educational, medical and socio-psychological research for exploring and confirming relations among observed and latent variables. In the existing SEMs, the unknown coefficients in the measurement and structural equations are assumed to be constant with respect to time. This assumption does not always hold, as the relation among the observed and latent variables varies with time for some situations. In this paper, we propose nonlinear dynamical structural equation models to cope with these situations, and explore the nonlinear dynamic of the relation between the variables involved. A local maximum likelihood-based estimation procedure is proposed. We investigate a bootstrap resampling-based test for the hypothesis that the coefficient is constant with respect to time, as well as confidence bands for the unknown coefficients. Intensive simulation studies are conducted to show the empirical performance of the proposed estimation procedure, hypothesis test statistic and confidence band. Finally, a real example in relation to the stock market of Hong Kong is presented to demonstrate the proposed methodologies.     

A mixture of Gaussians approach to mathematical portfolio oversight: the EF3M algorithm

An analogue can be made between: (a) the slow pace at which species adapt to an environment, which often results in the emergence of a new distinct species out of a once homogeneous genetic pool and (b) the slow changes that take place over time within a fund, mutating its investment style. A fund’s track record provides a sort of genetic marker, which we can use to identify mutations. This has motivated our use of a biometric procedure to detect the emergence of a new investment style within a fund’s track record. In doing so, we answer the question: What is the probability that a particular PM’s performance is departing from the reference distribution used to allocate her capital? The EF3M algorithm, inspired by evolutionary biology, may help detect early stages of an evolutionary divergence in an investment style and trigger a decision to review a fund’s capital allocation.     

会计准则改革、实际控制人性质与盈余管理

以2003～2005、2008～2010年间沪、深A股制造业上市公司为样本,考察会计准则改革对实际控制人性质不同公司盈余管理程度的影响。结果表明,会计准则改革后,中央控股公司的盈余管理程度没有发生显著变化,地方控股公司和民营公司的盈余管理程度均显著提高,且二者盈余管理程度提高的幅度不存在显著差异。     

我国地方政府债务可持续性的综合分析框架

本文首先从地方政府的或有负债、债务安全性指标、资产负债表视角对当前我国地方政府的债务可持续性现状进行了静态分析,其次从跨期预算约束角度对政府债务可持续性进行了动态评估,最后根据地方政府债务性风险产生的原因,提出防范、化解和处置我国地方政府债务风险的建议.