Characterizations of two power indices for voting games with r alternatives

In the first three sections of this paper we present a set of axioms which provide a characterization of an extension of the Banzhaf index to voting games with r alternatives, such as the United Nations Security Council where a nation can vote “yes”, “no”, or “abstain”. The fourth section presents a set of axioms which characterizes a power index based on winning sets instead of pivot sets. Received: 4 April 2000/Accepted: 30 April 2001     

Jury theorems with multiple alternatives

I consider a game in which imperfectly informed jurors vote to select one of several possible choices when there is a natural ordering of the possibilities. Each juror votes for the largest alternative the juror would like to implement, and the alternative that is selected is the largest alternative supported by a given number of jurors. For non-unanimous voting rules, the probability of a mistaken judgment goes to zero as the number of jurors goes to infinity. I also give necessary and sufficient conditions to obtain asymptotic efficiency under unanimous voting rules, and show that unanimous rules may lead to a bias in which moderate outcomes are never chosen.     

DHM simulation in virtual environments: a case-study on control room design

This paper will present the workflow developed for the application of serious games in the design of complex cooperative work settings. The project was based on ergonomic studies and development of a control room among participative design process. Our main concerns were the 3D human virtual representation acquired from 3D scanning, human interaction, workspace layout and equipment designed considering ergonomics standards. Using Unity3D platform to design the virtual environment, the virtual human model can be controlled by users on dynamic scenario in order to evaluate the new work settings and simulate work activities. The results obtained showed that this virtual technology can drastically change the design process by improving the level of interaction between final users and, managers and human factors team.     

Computer environments for children: a review of design issues

Ergonomic design considerations for computer use in schools are reviewed. Evidence for the postural effects of ergonomic furniture from worldwide studies is evaluated. Issues of furniture sizing and allocation methods are discussed. The limited evidence for effects of input device design on schoolchildren is summarized. Future directions for ergonomic research studies are presented.     

Working with women in secure environments

1. Women's adverse experiences as patients in secure and other mental health services appear to reflect sexism in wider social and historical contexts. 2. A Women's Service Development Group in a medium secure unit in the United Kingdom has made improvements in services for female patients, including an independent advocacy and befriending service, a Well-Woman Clinic, and other gender-sensitive activities. 3. In general, services were evaluated positively by women. Some dissatisfaction primarily was related to activities, issues concerning seclusion, and the lack of a day area for women only. 4. Women had mixed views about their contact with male staff and patients. Because of this, policies and services in this and related areas should account for individual needs.     

Inefficient committees: small elections with three alternatives

We consider small committees which have to elect one of three alternatives using the simple plurality rule. Committee members have common, state-dependent preferences and receive imprecise private signals about the state of nature prior to the election. We are interested in whether the committee decision is efficient, that is whether the probability with which the committee elects the correct alternative is higher than the probability with which one single individual alone—on behalf of the others—would. It has been shown that there exists a unique efficient equilibrium in elections with two alternatives. We show that this result does not extend to elections with more alternatives. Multiple equilibria may exist for the same committee, and there may be both efficient and inefficient ones. Informative voting may or may not be an equilibrium. Also contrary to two-alternative elections, there exist responsive equilibria in which voters vote ‘against’ their signal. As a consequence, only two alternatives receive positive expected vote shares and the outcome is inefficient.     

Aggregation of preferences with a variable set of alternatives

A social choice correspondence called the Essential set is studied with the help of an axiom called Cloning Consistency. Cloning consistency is the requirement that the formal choice rule be insensitive to the replication of alternatives. The Essential set is the support of the optimal mixed strategies in a symmetric two-party electoral competition game. Received: 24 March 1998/Accepted: 3 March 1999     

Social choice in economic environments with dimensional variation

An argument for welfarist social evaluation is presented that replaces the independence axiom with a consistency axiom for social-evaluation functionals in economic environments. This axiom (consistency across dimension or COAD) requires that, if two allocations contain suballocations in common, and if individual utility functions are projected down to the smaller economy where allocations change, then these small allocations must be ranked in the same way that their ancestral allocations were.The basic result is applied to different information environments and a variety of ethical axioms appropriate to economic environments is investigated.We are indebted to Charles Blackorby, Erwin Diewert, Ed Morey, Bill Schworm and John Weymark for helpful discussions, and to the Social Sciences and Humanities Research Council, the Killiam Foundation and the National Science Foundation, for research support.     

Working with a multidisciplinary team in secure psychiatric environments

1. Research on working with a multidisciplinary team in inpatient mental health care is underdeveloped. 2. Knowledge of how to work as part of a team is taken for granted within the realm of professional training. 3. In effective teams, members value the support, knowledge, and professional development that membership offers. 4. Training teams to be more effective requires diverse educational strategies.     

Implementation in generic environments

In this paper, we study implementation in “economic environments”. It is shown that there is a dense subset of the set of preference profiles such that given an arbitrary social choice function, f, and ε>0, there exists another social choice function, f _ε, within ε of f uniformly and implementable in Nash equilibrium on the dense subset.     

Evaluating high-tech alternatives by using analytic network process with BOCR and multiactors

The main purpose of this study is to solve a real-world, multicriteria, high-tech selection problem by using analytic network process (ANP). The proposed ANP model consists of a control hierarchy, and a network of connections among the clusters of alternatives, actors and criteria. The strategic criteria were included into the model to rate benefits (B), opportunities (O), costs (C), and risks (R). Then, final synthesis of alternatives was obtained by using rated BOCR. Three actor groups at each step of ANP were cooperated to gain their contributions into the decision as well as to promote the implementation. The results and their interpretations are presented. The management has currently implemented the new high-tech transaction processing system proposed by this study as the best alternative.     

The elderly in rural environments

This paper provides a critical examination of the research available on the rural elderly in America. A detailed review of the many studies and topical areas investigated by rural gerontologists is not attempted. Rather, several ‘salient aspects’ of rurality (occupational, ecological and sociocultural) are identified as a basis for describing and explaining the status and experiences of older people in rural areas. The meaning of these dimensions as they relate to rural environments and the elderly is explored through both a general discussion and an application to two substantive issues — health status and life satisfaction. This examination illustrates the sizeable gaps that exist in what we currently know about the rural elderly and the problems/drawbacks of approaches traditionally used to study this topic. The paper concludes with a call for a more unified and conceptually based approach to future rural elderly research, that focuses on how and why the ‘salient aspects’ of rurality produce different circumstances and experiences for the elderly, and that emphasizes rural variation, not just ‘rural vs urban’ comparisons.     

Equitable opportunities in economic environments

 In this paper, we extend the axiomatic analysis of equitable opportunities developed in Kranich [6] from finite to continuous opportunity sets. This extended framework is amenable to economic applications. The main results establish conditions under which an ordinal ranking of profiles of opportunity sets can be represented by a cardinal advantage function which describes both the extent of inequality and the distribution of advantage among the agents. Received: 3 November 1993/Accepted: 18 December 1995     

A fundamental structure of strategy-proof social choice correspondences with restricted preferences over alternatives

I prove that under each strategy-proof and unanimous social choice correspondence, there is at least one agent who is decisive. Because the result is established on a weak requirement on preferences over sets, the existence of a decisive agent is an underlying feature of most strategy-proof and unanimous social choice correspondences. Moreover, I consider a restriction on the space of preferences over alternatives. I prove that circular sets of preferences over alternatives are sufficient for the existence of a decisive agent.     

Integration and alternatives: Some current issues in psychoanalytic theory

The first great bridge between psychoanalysis and social work came with the concepts of ego psychology which provided a synthesis between the worlds of the social order and the psychological depths. Current psychoanalytic theorists now question whether any one psychological theory is sufficient to describe the complexity of human experience, and suggest that each theory has a piece of the truth because it states something that is correct about the patient at a particular time in the treatment. Adherence to multiple theories makes a complex problem for the clinical practitioner, who must decide from which perspective to respond to the clinical material of the moment. Psychoanalytic theorists are also questioning the degree to which it is actually the content of the therapist's interpretations which brings about change in the patient. This article suggests that these developments in psychoanalysis, with their emphasis on therapeutic flexibility and the importance of the relationship will renew and reinvigorate the bridge between psychoanalysis and clinical social work.An earlier version of this paper was presented at the First Clinical Conference of the National Federation of Societies for Clinical Social work.     

Skill training in multimodal virtual environments

Multimodal, immersive, virtual reality (VR) techniques open new perspectives for perceptual-motor skill trainers. They also introduce new risks and dangers. This paper describes the benefits and pitfalls of multimodal training and the cognitive building blocks of a multimodal, VR training simulators.     

The conservation challenge in sustaining rural environments

The focus of this paper is on obstacles to conservation and specific conservation initiatives. While policy makers are influenced by the social constructions of rural and while there is unlikely to be common agreement on what is rural, convergences can occur on the most efficacious approaches towards conservation through widening communities of knowledge achieved by greater efforts to evaluate strategies and to share experiences from different localities. The paper begins with a brief conceptualization of the trade-offs involved between commodity and non-commodity uses of rural lands. A more elaborate discussion follows of the dominant factors which undermine conservation of rural environments. In the face of these obstacles the paper examines a wide variety of strategies and actions from OECD countries to provide a better balance between commodity and non-commodity functions. Although governments are expected to continue to play an important leadership, policy setting and regulatory role, it is clear from the examples presented in this paper that many important initiatives are coming from non-governmental organizations and that partnerships between public and private sectors and between private and non-governmental sectors have significant potential to clarify issues, to establish common ground and galvanize constructive action.     

Social environments with competitive pressure: Gender effects in the decisions of German schoolchildren

Systematic differences in decision making between genders have been discovered in both competitive and pro-social environments. These contexts, however, have been previously studied in isolation while in naturally occurring settings pro-social and competitive pressures often overlap in economically meaningful ways. Here we report data from an experiment involving German schoolchildren where dictators are in one town and receivers in another. Our experiment informs decision making in social environments that include differing levels of competitive pressure. We find that competitive pressure significantly mitigates pro-sociality in boys, while it does not affect girls’ propensities to make fair decisions. This finding is robust to controlling for social and cognitive factors, and it may shed additional light on the evolutionary roots of human social preferences.