Time completion for various dispatching rules in job shops

This study investigates the relative priority of various job shop dispatching rules for various shop utilization levels under both deterministic and stochastic assumptions with regard to processing times. The primary criterion for evaluation is that of percentage on time completion. The results indicate that an assumption of accurately predetermining actual operation times in most cases is not likely to weaken the analysis and impact of research studies which are performed using such an assumption. Also conclusions indicate that the ranking of dispatching rules according to their effectiveness varies significantly with shop utilization levels.     

Regression analysis and ratio analysis for domains: A randomization-theory approach

In most surveys, inference for domains poses a difficult problem because of data shortage. This paper presents a probability sampling theory approach to some common types of statistical analysis for domains of a surveyed population. Simple and multiple regression analysis, and analysis of ratios are considered. Two new methods are constructed and explored which can improve substantially over the common method based on sample-weighted sums of squares and products. These new methods use auxiliary variables whose importance depends on the extent to which they succeed in explaining certain patterns in the regression residuals. The theoretical conclusions are supported by empirical results from Monte Carlo experiments.     

Umweltgerechtigkeit als Forschungsparadigma der Soziologie

This paper discusses Environmental Justice to be a probably new area of research for environmental sociology. In order to reveal the complex structure of Environmental Justice related discourses and to promote more research on that topic, an analytical framework is elaborated, based on a distinction between the US-American experiences and recent European debates. Environmental Justice is understood here as a mutual process of negotiating conflicts of interests rather than a fixed state. Several “decision spots” will be carved out, which have to be considered in environmental-political regulations which are challenged by perceptions of social justice. The analytical framework will finally be illustrated by the empirical example of the new airport for Berlin, “Berlin-Brandenburg International”.     

JOB-SHOP VS. HYBRID FLOW-SHOP ROUTING IN A DUAL RESOURCE CONSTRAINED SYSTEM

This paper studies the impact of job routing pattern on the performance of dual resource constrained (DRC) systems. Three markedly different job routing patterns are simulated using a DRC system model that incorporates labor transfer times. The problem is viewed from two perspectives: one portion of the analysis focuses on the relative performances of five different dispatching rules as the routing pattern varies; the other examines the effect of the routing pattern on each rule's individual performance. One generalized conclusion of this study is that routing pattern has no significant impact on the relative effectiveness of various dispatching rules. Consequently, findings from pure job-shop research studies may be applied to situations where a mixture of job-shop and flow-shop routings is present.     

Führungskulturen an der Universität: Feedbackinstrumente als Schlüssel zur Personalentwicklung

Management culture at German universities. Guided feedback as an instrument to develop leadership skills In future, universities will be fundamentally more exposed to national and international competition than they are today. The challenges for Germany’s universities arising from this are increased by the reform pressure towards a modernization of the governmental administration. On grounds of these new tasks and challenges, inner-organizational changes as well as the development of a leadership responsibility and further training of the employees’ social skills are necessary. Therefore up-to-date personnel development belongs to a university’s modernization program. At the Berlin University of Technology appraisals by subordinates are practiced in order to design a fair leadership culture. The crucial factor for this is the professor’s and administration manager’s identification with their leadership role. For a further process consultation the adoption of coaching is recommended.