Large scale communication networks—Design and analysis

The paper discusses the problem of design and analysis of large scale communication systems. An iterative process, composed of a minimum cost network design algorithm and a network performance algorithm, is presented for the solution of these problems. Computational considerations, using these algorithms, are discussed.     

Credibility, Information Preferences, and Information Interests

The Seveso Directive of the European Union demands that information be provided to the public by companies and authorities about facts, risks, and behaviors related to hazardous facilities, in particular chemical facilities. On behalf of the Commission of the European Communities, a survey was run in five European countries on the credibility of various information sources. This article describes the results of the German study. 430 persons were interviewed with a questionnaire of 50 items, in particular about their perceptions and evaluations of technical risks, the credibility of sources of information about chemical risks, their preferences for receiving risk information from these sources, and their interests in receiving information. Major findings are great differences in credibility, differentiated information preferences, and strong information interests. Surprisingly, credibility played only a minor role with regard to the respondents'information preferences and interests.     

Robust scale estimation in the error-components model using the empirical characteristic function

Robust estimators of the scale parameters in the error-components model are described. The new estimators are based on the empirical characteristic functions of appropriate sets of residuals and are affine equivariant, consistent and asymptotically normal. The robustness of the new estimators is investigated via influence-function calculations. The results of Monte Carlo experiments and an example based on real data illustrate the usefulness of the estimators.     

Reevaluation of task-centered social work practice

In a brief period of time, the “task-centered” approach to social work practice has become a major treatment modality, offering the clinician a degree of specificity and clarity that is often missing in more traditional practice. This paper reassesses the indications and contraindications for this model, contrasting it with other treatment approaches which also utilize the technical variables of brevity, time limits, and task assignment. The diagnostic criteria for the utilization of this approach are discussed in detail, with special emphasis on its applicability to the severely disturbed client.     

The meshing of youth development and community building

Practitioners, policymakers, residents, workers, researchers, and even funders have an opportunity to merge their many practices into a more comprehensive and focused approach to change communities substantially. People are affiliated with a number of communities, and not just those with geographical definitions. There are communities based on gender, sexual orientation, physical ability, race, ethnicity, and institutions such as family and school. Building the bridges between youth development and community building and merging their principles and practices will create a force of change. This chapter lays the foundation for meshing the worlds of youth development and community building to make powerful connections that will be important to the community of youth and bring them into wider circles and forces that ultimately will be important to the adult community as well.