This issue of JPP is dedicated to Professor Tomás Torres on the occasion of his 65th birthday. The cover picture represents his colorful life. It shows a selection of palette colors obtained in the group of Professor Torres, which illustrate just a small part of the assorted colored structures designed and prepared in Madrid. The background picture is The Plaza de Cibeles square, an emblematic ...

a r t i c l e i n f o JEL classification: I13 D82 H51 Keywords: Universal basic health insurance Voluntary supplementary insurance Public vs. private insurance Adverse selection Moral hazard Cost effectiveness This paper introduces a tractable model of health insurance with both moral hazard and adverse selection. We show that government sponsored universal basic insurance should cover treatmen...

In cooperative games, a key question is to find a division of payoffs to coalition members in a fair manner. Nucleolus is one of such solution concepts that provides a stable solution for the grand coalition. We study the computation of the nucleolus of a number of cooperative games, including fractional matching games and fractional edge cover games on general weighted graphs, as well as verte...

Motivated by the need for succinct representations of all “small” transversals (or hitting sets) of a hypergraph of fixed rank, we study the complexity of computing such a representation. Next, the existence of a minimal hitting set of at least a given size arises as a subproblem. We give one algorithm for hypergraphs of any fixed rank, and we largely improve an earlier algorithm (by H. Fernau,...

Article history: Received 21 October 2013 Received in revised form 30 September 2014 Accepted 21 October 2014 Available online 28 October 2014 Communicated by G. Ausiello

environmental factors are one of the most sensitive issues that should be considered in many decisions. site selection is one of the most widely used spatial decision making problems and is influenced by many environmental factors. the purpose of site selection is to find a set of appropriate spatial alternatives for a particular application. site selection is a multi-criteria decision making p...

Greater sage-grouse (Centrocercus urophasianus) are dependent on sagebrush (Artemisia spp.) for food and shelter during winter, yet few studies have assessed winter habitat selection, particularly at scales applicable to conservation planning. Small changes to availability of winter habitats have caused drastic reductions in some sage-grouse populations. We modeled winter habitat selection by s...

PO Box 6395, Lawrenceville, NJ 08648-0395, USA, and School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia Our cover illustration for the February 2006 issue was a departure from the custom of our first year. An artful assembly of the best in crystal photomicrographs submitted by authors of crystallization communications in 2005 replaced the ‘molecule of the mo...

Set covering problem is the model for many important industrial applications. In this paper, we solve some benchmarks of this problem with ant colony optimization algorithms using a new transition rule. A look-ahead mechanism was incorporated to check constraint consistency in ant computing. Computational results are presented showing the advantages to use this additional mechanism to ant syste...

We documented cover characteristics at white-tailed deer (Odocoileus virginianus dakotensis) bedding and feeding sites on winter and summer ranges in the central Black Hills, South Dakota and Wyoming. Radiolocations of female (2,592; n 5 73) and male (573; n 5 12) deer were compared with 1,087 random locations. Characteristics of cover recorded at deer and random locations included basal area, ...