Eine generische Komponente zur rechnergestützten Nutzung von Aufbauorganisationen

Zusammenfassung.   Die klassische Unterscheidung zwischen Aufbau- und Ablauforganisation eines Unternehmens deutet auf eine getrennte rechnergestützte Realisierung dieser beiden fundamentalen Komponenten einer Organisation hin. Dieser Beitrag unterstützt diese These, verweist aber gleichzeitig auf die integrierende Bedeutung einer rechnergestützten Aufbauorganisationsverwaltung, welche unterschiedliche Realisierungsformen der Ablauforganisation (unter anderem workflow-management und eCommerce) bedient. Die generelle Konzeption und Umsetzung einer solchen Aufbauorganisationsverwaltung wird in diesem Beitrag vorgestellt. Eingegangen am 14. Februar 2000 / Angenommen am 31. Mai 2000     

The formation experiment in the age of hypermedia and distance learning

Searching for an adequate method to investigate human development (especially the development of theoretical thinking) Vygotsky and his collaborators developed the causal genetic method. The basic idea of this method consists in the investigation of psychic functions and structures by their formation under controlled conditions (for instance via a formation experiment in classroom). But is this method also applicable in instructional settings using modern communications media?This paper is an attempt to find an answer to the question: By what means is the investigation of the formation of theoretical thinking realizable through the application of the causal-genetic method in instructional settings using hypermedia and distance learning? However, a closer examination of the question itself shows that there are three interrelated aspects, namely: the investigation and formation of theoretical thinking; distance learning using modern communications media; the causal-genetic method.It will be shown that in a formation experiment learning with a hyper-media-educational program, which is based on the theory of learning- activity, students reach a new level of cognitive development which is characterized by the growing ability of complex and dialectical thinking.     

Testing Criterion Correlations With Scale Component Measurement Errors Using Latent Variable Modeling

A latent variable modeling method for testing criterion correlations with measurement error terms in multicomponent measuring instruments is outlined. The approach is based on an application of the Benjamini–Hochberg multiple testing procedure and can be used when assumptions of validity estimation related procedures need to be examined. The method also allows studying the extent to which criterion validity coefficients might be due to the relationship between a presumed underlying latent construct evaluated by a psychometric scale and a criterion variable, or could be a consequence of the relation between measurement error in the overall scale score and the criterion. The discussed procedure is widely applicable with popular latent variable modeling software, and is illustrated using a numerical example.     

Der Übergang von der Grundschule in die Sekundarstufe I

Zusammenfassung Zu der Frage, auf welche Weise sich Merkmale der sozialen Herkunft auf den Schulübertritt nach der Primarstufe auswirken, wird in einer L?ngsschnittstichprobe 27 bayrischer Grundschulklassen der Verlauf des übertrittsprozesses untersucht, und zwar von den Bildungsaspirationen der Eltern am Ende der dritten Jahrgangsstufe über die Schullaufbahnempfehlungen der Lehrkr?fte bis hin zu den tats?chlichen Schulanmeldungen. Neben der Frage der Leistungsangemessenheit der Abschlussnoten und der erteilten Schulempfehlungen werden die Herkunftseffekte im Entscheidungsverlauf vertieft analysiert. Die letztendlich resultierende Schülerzuteilung zu den verschiedenen Bildungsg?ngen kovariiert deutlich mit der sozialen Herkunft der Schüler. Die vorgestellten Analysen der einzelnen vorgelagerten Entscheidungsschritte verweisen dabei auf eine st?rkere Bedeutung prim?rer gegenüber sekund?rer Einflusseffekte der sozialen Herkunft auf die Schulformzuteilung.      

Maximal Criterion Validity and Scale Criterion Validity: A Latent Variable Modeling Approach for Examining Their Difference

This article studies the difference between the criterion validity coefficient of the widely used overall scale score for a unidimensional multicomponent measuring instrument and the maximal criterion validity coefficient that is achievable with a linear combination of its components. A necessary and sufficient condition of their identity is presented in the case of measurement errors being uncorrelated among themselves and with a used criterion. An upper bound of the difference in these validity coefficients is provided, indicating that it cannot exceed the discrepancy between the maximal reliability and composite reliability indexes. A readily applicable latent variable modeling procedure is discussed that can be used for point and interval estimation of the difference between the maximal and scale criterion validity coefficients. The outlined method is illustrated with a numerical example.     

A pilot scale trickling filter with pebble gravel as media and its performance to remove chemical oxygen demand from synthetic brewery wastewater

Evaluating the performance of a biotrickling filter for the treatment of wastewaters produced by a company manufacturing beer was the aim of this study. A pilot scale trickling filter filled with gravel was used as the experimental biofilter. Pilot scale plant experiments were made to evaluate the performance of the trickling filter aerobic and anaerobic biofilm systems for removal of chemical oxygen demand (COD) and nutrients from synthetic brewery wastewater. Performance evaluation data of the trickling filter were generated under different experimental conditions. The trickling filter had an average efficiency of (86.81±6.95)% as the hydraulic loading rate increased from 4.0 to 6.4 m³/(m²·d). Various COD concentrations were used to adjust organic loading rates from 1.5 to 4.5 kg COD/(m³·d). An average COD removal efficiency of (85.10±6.40)% was achieved in all wastewater concentrations at a hydraulic loading of 6.4 m³/(m²·d). The results lead to a design organic load of 1.5 kg COD/(m³·d) to reach an effluent COD in the range of 50–120 mg/L. As can be concluded from the results of this study, organic substances in brewery wastewater can be handled in a cost-effective and environmentally friendly manner using the gravel-filled trickling filter.