Chartering strategies for shipping companies

This paper describes a model which may be used in the evaluation of the relative effectiveness of policies used in the areas of ship chartering and the switching of combined carriers between the dry cargo market and the tanker market. The policies for chartering and market switching are expressed in the form of ‘desired proportions’ of the fleet operating in a particular charter-mode or a particular market. Graphical illustration of this form of expression of policies can be easily understood, so that alternative policies can be designed with relative ease. The effectiveness of a particular form of policy under various freight market conditions can be determined from the model, the use of which is illustrated by its application to the deployment of the fleet of an hypothetical shipping company. It is assumed that the feedback connection between the company's actions and the marketplace is negligible.     

Validation of a Measure of Intimate Partner Abuse With Couples Participating in Divorce Mediation

Critics of court mandated divorce mediation have raised awareness of the need for screening measures to assess intimate partner abuse. This study validates a new instrument that is a revised version of the Partner Abuse Scales developed by Walter Hudson in the 1990s. The Relationship Behavior Rating Scale (RBRS) correlates highly with the original scales and subscales developed from the original and RBRS items have equally high reliability. The new scale is a reliable measure for intimate partner abuse in divorce mediation.     

Evaluating theory-based evaluation: information, norms, and adherence

Programmatic social interventions attempt to produce appropriate social-norm-guided behavior in an open environment. A marriage of applicable psychological theory, appropriate program evaluation theory, and outcome of evaluations of specific social interventions assures the acquisition of cumulative theory and the production of successful social interventions - the marriage permits us to advance knowledge by making use of both success and failures. We briefly review well-established principles within the field of program evaluation, well-established processes involved in changing social norms and social-norm adherence, the outcome of several program evaluations focusing on smoking prevention, pro-environmental behavior, and rape prevention and, using the principle of learning from our failures, examine why these programs often do not perform as expected. Finally, we discuss the promise of learning from our collective experiences to develop a cumulative science of program evaluation and to improve the performance of extant and future interventions.     

Exchange curves for fixing batch quantities

The problem considered is that of choosing batch quantities to minimize costs, subject to the constraints that neither overall set-up costs nor overall set-up time can be increased beyond certain limits. Theoretical and graphical solutions are obtained for two possible formulations of the problem, and a simple practical procedure is suggested.     

Validation of a Measure of Intimate Partner Abuse (Relationship Behavior Rating Scale–Revised) Using Item Response Theory Analysis

There is a need for a screening instrument to provide insight into intimate partner abuse (IPA) to inform legal decisions in child custody, divorce, child welfare, and criminal cases. This study is the third validation of the Relationship Behavior Rating Scale–Revised (RBRS–R) for concurrent validity with the widely used Conflict Tactics Scales 2 (CTS2). Item response theory results show that the RBRS–R compares favorably to the CTS, but also provides a higher degree of resolution than the CTS2 with respect to additional elements of IPA that can be manifested in different situations or individuals. This additional information might be very important in determining the safest legal process (mediation versus traditional litigation) and appropriate case outcomes to protect victims of violence.