An uncertainty-aware AGV assignment algorithm for automated container terminals

This paper studies job assignments for automated guided in container terminal settings under various conditions of uncertainty. An introduction to their operation is provided, along with a flexible dispatching algorithm, suitable for real-time control of AGVs. Using these concepts a new AGV dispatching approach is developed, capable of operating under uncertain conditions within a detailed container terminal model. Several performance indicators are presented, focused on generic features of vehicle operations as well the assessment of uncertainty levels inside the terminal. From the results of the simulation experiments, it is found that the proposed technique outperforms well known heuristics and alternative algorithms.     

The effect of the GARCH(1, 1) on autocorrelation tests in dynamic systems of equations

Using Monte Carlo methods, the properties of systemwise generalizations of the Breusch–Godfrey test for autocorrelated errors are studied when there are some kinds of GARCH effects among the errors. The analysis, regarding the size of the test, reveals that the GARCH have considerable effects of the properties of the test regarding the size, especially in large systems of equations. The corrected LR tests, however, have been shown to perform satisfactorily in small systems when the errors are white noise or they have low GARCH effects, whilst the commonly used TR2 test behaves badly even in single equations. All tests perform badly, however, when the number of equations increases and the GARCH effect is strong. As regards the power of the test, the GARCH was not found to have any significant effects on the power properties of the test.     

Seasoned equity offerings,operating performance and overconfidence: Evidence from the UK

Prior research on seasoned equity offerings in UK shows that equity issuers report a significant long-term underperformance in the period following the event. However, the factors contributing to such underperformance are not yet fully explored. Using a sample of rights issues for the period 1988–1998, this study suggest that the long-term underperformance is significantly related to a deterioration of companies’ operating fundamentals in the post-offering period. Further comparison between “Best” and “Worst” post-issue performers reveals that long-term underperformance is predominantly robust in the case of fastgrowing firms with over-optimistic management. This evidence is consistent with the managerial overconfidence and “empire-building” hypotheses.     

Modeling quality demand with data from Household Budget Surveys: An application to meat and fish products in Greece

In this paper, we employ a method to examine the factors affecting quality choice by Greek households, using cross-sectional survey data. We illustrate the method using the raw data of the 2004/05 Household Budget Survey for meat and fish products. Quality elasticities of total food expenditure and household's age structure are derived. To cope with the zero expenditure problem, Heckman's two-step method is employed. Results generally suggest that several socio-economic factors affect quality demand for meat and fish.     

On the determination of maximum accuracy for regression processes with endogenous variable constraints

Optimal regression design is studied for a sequential problem in which the experimenter wishes to constrain the probable value of a dependent variable to the vicinity of a given target. In the context suggesting the problem, the dependent variable is an effluent, and the target arises from anti-pollution regulation.     

Food away from home expenditures and obesity among older Europeans: are there gender differences?

Older people (i.e., at least 50?years of age) are becoming one of the most important demographic groups in the world. We explore the effect of food away from home expenditures on obesity among the older population in Europe using instrumental variable methods. Several statistical tests were conducted to assess endogeneity of selected variables, the exogeneity, relevance, and validity of instruments used. Our results generally suggest that food-away-from-home expenditure has no statistically significant effect on body mass index (BMI) of older males but is negatively related to BMI of older females.     

The White Paper on Growth,Competitiveness and Employment and Greek Small and Medium Sized Enterprises

This paper makes an assessment of the homo-genous approach and policy measures towards SMEs, adopted by the White Paper on Growth, Competitiveness and Employment and by national policies in Greece. It is demonstrated that there is a key distinction between the structure of competitive, high-tech, highly-specialized SMEs in advanced countries, whose size is determined by the size of the international niche market where they compete, on the one hand and on the other, SMEs in Greece or in other less developed member-states, whose (micro) size is determined by the local markets they serve, while in most cases they do not have the marketing skills/approach to address export markets. Copying successful instruments for SMEs in advanced countries can thus be most dangerous for the less developed countries, since the industrial organization of the typical SME is very different from those SMEs in Northern Europe. Therefore, the effects of policy measures, without further modifications, will be different from those envisioned by the EU policy-makers. Increasing the utilization of assistance by SMEs in less developed member-states is likely to be more effective if the assistance focuses on incentives and services, which support cooperative action in local and foreign markets, rather than on direct SME financing.     

Measuring the Magnitude of Significant Market Power in the Manufacturing and Services Industries: A Cross Country Approach

This paper provides estimates of price-marginal cost ratios for manufacturing and services sectors in the Eurozone, the US and Japan over the period 1970–2007. The estimates are obtained applying τhe methodology developed by Hall (J Pol Econ 96:921-947 1988) and extended by Roeger (J Pol Econ 103:316-331 1995) on the EU KLEMS March 2011 database. The empirical findings show that sectors that are more open to internationalisation such as textiles, experience relatively the lowest mark up ratios, while policy makers should enhance their policy in fragmented industries in which profitability indicators of market players indicate evidence of imperfect competition. The major stylized facts that are emerged from the empirical results based on the Ordinary Least Squares, Two Step Least Squares and Bootstrap methods of estimation are a) there is no evidence of imperfect competition across the majority of industries in Eurozone, US and Japan, b) sectors that are more open to internationalisation, experience relatively lower mark up ratios than the ratios experienced in less open sectors to internationalisation and c) deregulated industries generally have lower mark – up ratios than regulated industries, while fragmented industries generally exhibit higher mark – up ratios than segmented ones.