Verbindung einer Netzplantechnik mit der Vektortransformation

Ohne Zusammenfassung     

Kontextualisierung der Medienwahl mit Hilfe von Kommunikationsgenres

Value creation is increasingly organised in virtualised settings requiring effective computer-mediated communication. While media choice has been a topic of interest in Information Systems for some time, corresponding media choice theories exhibit a range of shortcomings with regard to applicability in context. Since the theories try to generalise across social contexts, their key constructs are rather abstract and underspecified with regard to application. Against this backdrop we present an approach for contextualising media choice using genre analysis. Genre analysis aims at identifying communication patterns (genres) in social communities (e. g. teams) as a structured overview of existing team communication. By juxtaposing requirements of the identified genres and media characteristics, we are able to propose a new set of media for improving team communication. We illustrate the application of our approach with a case example.     

Untersuchungen zur qualitativen Behandlung von linearen Differentialgleichungssystemen mit unstetiger rechter Seite mit Hilfe der Theorie der Distributionen

By means of the theory of distributions the possibilities to obtain qualitative statements concerning solutions of systems of linear differential equations with discontinuous right hand sides are investigated. A number of existence and uniqueness theorems is proved for a suitable defined initial value problem. Moreover the structure of solutions (continuity, periodicity etc.) is investigated more closely. It is shown that a number of theorems known from the classical theory of periodical solutions is applicable to differential equations in the space of distributions with only slight modifications.     

Numerische Erfahrungen mit der Filtermethode von Balas in der linearen binären Optimierung

It is not possible to support by numerical tests the common opinion that the filter method is better than the additive algorithm. The reasons for the limited efficiency of the filter method are stated together with results of numerical tests.     

Eine Methode zur Nullstellenbestimmung von Funktionen

In the present paper we give a method for determining all the zeros of a function in an arbitrary given interval of the domain of definition of the function. Here the domain of definition and the rang values of the function are subsets of arbitrary ordered linear spaces. The method was tested on many numerical examples, some of which are given below.     

Bausteinbasierte Modellierung von Prozesslandschaften mit der PICTURE-Methode am Beispiel der Universitätsverwaltung Münster

Public administrations face a strong pressure to reorganise caused by decreasing financial resources, a changing political environment, and increased customer demand. A process oriented visualisation, analysis and improvement of administrational processes is a key prerequisite for the successful organisational and technical change of public administrations within the current reorganisation activities. In order to successfully conduct reorganisation projects a coherent view on all administrational processes (the process landscape) and their interdependencies is of great value as a starting point. Common approaches to collect and visualise processes lead to such complex models that only a small percentage of the overall process landscape can be examined. The PICTURE-method as the core of this paper surpasses weaknesses of classical approaches and allows for a very efficient means of modelling the process landscape by using 24 domain specific reusable process building blocks. Hence by applying the PICTURE-method one can create a high degree of transparency as a base for reorganisation projects. In this paper we conceptually introduce the PICTURE-method and describe its practical application in a large modelling project within the administration of the University of Münster. We describe the experiences made by applying PICTURE and evaluate the method in terms of the requirements made by the project contractor.     

Algorithmus 4 Entwurf sequentieller Schaltkreise nach der Methode Huffman-Mealy

Ohne Zusammenfassung     

SOAM – Eine Methode zur Konzeption betrieblicher Software mit einer Serviceorientierten Architektur

A big challenge when introducing service-oriented architecture for software is not only the technical implementation, but also the software design. In particular the enforcement of service design principles demands a methodical approach. Existing methods either support only partial aspects of SOA or are incomplete in respect to the method’s characteristics. A tool-supported method that realises clearly defined architecture realms has been developed. It builds on top of known approaches and has been in evaluated and refined using action research at Vattenfall Europe. The usefulness of artefacts generated by the method has been confirmed for the first time by a successful implementation.     

Über Struktur und Abschätzungen der Lösungsmenge von linearen Gleichungssystemen mit Intervallkoeffizienten

In this paper an intervalanalytic generalization of the theorem ofPrager-Oettli is used to characterize the solution-set of an, n-system of linear equations with interval coefficients as union of convex polyhedra with special properties. Then it is shown how to deduce from the theorem ofPrager-Oettli a nearly optimaln-interval contained in the solution-set. On the other hand the problem of finding with reasonable expense sharpn-intervals containing the solution-set is solved only for special cases. Some results on this problem are discussed; a numerical example shows the importance of criteria, under which sharpn-intervals can be computed with reasonable effort.     

Bewertung von IT-Investitionen mit dem Realoptionsansatz

Real Options Theory is often applied when evaluating IT investments. The application of Real Options Theory is generally accompanied by a monetary valuation of real options through option pricing models which in turn are based on restrictive assumptions and thus subject to criticism. Therefore, this paper analyzes the application of option pricing models to the valuation of IT investments. A structured literature review reveals the types of IT investments which are valued with Real Options Theory in scientific literature. These types of IT investments are further investigated and their main characteristics are compared to the restrictive assumptions of traditional option pricing models. This analysis serves as a basis for further discussion on how the identified papers address these assumptions. The results show that a great deal of papers do not account for critical assumptions, although it is known that the assumptions are not fulfilled. Moreover, the type of IT investment determines the criticality of the assumptions. Additionally, several extensions or adaptions of traditional option pricing models can be found which provide the possibility to relax critical assumptions. Researchers can profit from the results derived in this paper in two ways: First, is is demonstrated which assumptions can be critical for which type of IT investments. Second, extensions of option pricing models that relax critical assumptions are introduced.     

Skalierbare Verarbeitung von XML mit Infonyte-DB

The emerging penetration of IT architectures with XML results in increasing XML data volumes. Available tools often fail in realizing scalable XML processing for large XML data volumes. Infonyte-DB, a product of Infonyte GmbH, is a high performance XML kernel that economizes on system resources and allows the processing of large XML data volumes.