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    <title>OPUS 4 Latest Documents RSS Feed</title>
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    <pubDate>Fri, 21 Sep 2012 09:09:17 +0200</pubDate>
    <lastBuildDate>Fri, 21 Sep 2012 09:09:17 +0200</lastBuildDate>
    <item>
      <title>Proceedings of KogWis 2012. 11th Biannual Conference of the German Cognitive Science Society</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/690</link>
      <description>The German cognitive science conference is an interdisciplinary event where researchers from different disciplines -- mainly from artificial intelligence, cognitive psychology, linguistics, neuroscience, philosophy of mind, and anthropology -- and application areas -- such as eduction, clinical psychology, and human-machine interaction -- bring together different theoretical and methodological perspectives to study the mind. The 11th Biannual Conference of the German Cognitive Science Society took place from September 30 to October 3 2012 at Otto-Friedrich-Universität in Bamberg. The proceedings cover all contributions to this conference, that is, five invited talks, seven invited symposia and two symposia, a satellite symposium, a doctoral symposium, three tutorials, 46 abstracts of talks and 23 poster abstracts.</description>
      <author>Dietrich Dörner; Rainer Goebel; Mike Oaksford; Michael Pauen; Elsbeth Stern</author>
      <category>conferenceobject</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/690</guid>
      <pubDate>Fri, 21 Sep 2012 09:09:17 +0200</pubDate>
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    <item>
      <title>The CHORCH Approach: How to Model B2Bi Choreographies for Orchestration Execution</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/392</link>
      <description>The establishment and implementation of cross-organizational business processes is an implication of today's market pressure for efficiency gains.&#13;
In this context, Business-To-Business integration (B2Bi) focuses on the information integration aspects of business processes.&#13;
A core task of B2Bi is providing adequate models that capture the message exchanges between integration partners.&#13;
Following the terminology used in the SOA domain, such models will be called choreographies in the context of this work.&#13;
Despite the enormous economic importance of B2Bi, existing choreography languages fall short of fulfilling all relevant&#13;
requirements of B2Bi scenarios.&#13;
Dedicated B2Bi choreography standards allow for inconsistent outcomes of basic interactions and&#13;
do not provide unambiguous semantics for advanced interaction models.&#13;
In contrast to this, more formal or technical choreography languages may provide unambiguous modeling semantics,&#13;
but do not offer B2Bi domain concepts or an adequate level of abstraction.&#13;
Defining valid and complete B2Bi choreography models becomes a challenging task in the face of these shortcomings.&#13;
At the same time, invalid or underspecified choreography definitions are particularly costly considering the organizational&#13;
setting of B2Bi scenarios.&#13;
Models are not only needed to bridge the typical gap between business and IT,&#13;
but also as negotiation means among the business users of the integration partners on the one hand&#13;
and among the IT experts of the integration partners on the other.&#13;
Misunderstandings between any two negotiation partners potentially affect the agreements between all other negotiation partners.&#13;
&#13;
The CHORCH approach offers tailored support for B2Bi by combining the strengths of both dedicated B2Bi standards and formal rigor.&#13;
As choreography specification format, the ebXML Business Process Specification Schema (ebBP) standard is used.&#13;
ebBP provides dedicated B2Bi domain concepts such as so-called BusinessTransactions (BTs) that abstractly specify the exchange of a request business document&#13;
and an optional response business document.&#13;
In addition, ebBP provides a format for specifying the sequence of BT executions for capturing complex interaction scenarios.&#13;
&#13;
CHORCH improves the offering of ebBP in several ways.&#13;
Firstly, the execution model of BTs which allows for inconsistent outcomes among the integration partners&#13;
is redefined such that only consistent outcomes are possible.&#13;
Secondly, two binary choreography styles are defined as B2Bi implementation contract format in order to streamline implementation projects.&#13;
Both choreography styles are formalized and provided with a formal execution semantics for ensuring unambiguity.&#13;
In addition, validity criteria are defined that ensure implementability using BPEL-based orchestrations.&#13;
Thirdly, the analysis of the synchronization dependencies of complex B2Bi scenarios is supported&#13;
by means of a multi-party choreography style combined with an analysis framework.&#13;
This choreography style also is formalized and standard state machine semantics are reused in order to ensure unambiguity.&#13;
Moreover, validity criteria are defined that allow for analyzing corresponding models for typical multi-party choreography issues.&#13;
&#13;
Altogether, CHORCH provides choreography styles that are B2Bi adequate, simple, unambiguous, and implementable.&#13;
The choreography styles are B2Bi adequate in providing B2Bi domain concepts, in abstracting from low-level implementation details&#13;
and in covering the majority of real-world B2Bi scenarios.&#13;
Simplicity is fostered by using state machines as underlying specification paradigm.&#13;
This allows for thinking in the states of a B2Bi scenario and for simple control flow structures.&#13;
Unambiguity is provided by formal execution semantics whereas implementability (for the binary choreography styles) is ensured by providing&#13;
mapping rules to BPEL-based implementations.&#13;
&#13;
The validation of CHORCH's choreography styles is performed in a twofold way.&#13;
&#13;
Firstly, the implementation of the binary choreography styles based on Web Services and BPEL technology is demonstrated&#13;
which proves implementability using relatively low-cost technologies.&#13;
Moreover, the analysis algorithms for the multi-party choreography styles are validated using a Java-based prototype.&#13;
&#13;
Secondly, an abstract visualization of the choreography styles based on BPMN is provided that abstracts from&#13;
the technicalities of the ebBP standard.&#13;
This proves the amenability of CHORCH to development methods that start out with visual models.&#13;
CHORCH defines how to use BPMN choreographies for the purpose of B2Bi choreography modeling&#13;
and translates the formal rules for choreography validity into simple composition rules that&#13;
demonstrate valid ways of connecting the respective modeling constructs.&#13;
&#13;
In summary, CHORCH allows integration partners to start out with a high-level visual model of their interactions in BPMN&#13;
that identifies the types and sequences of the BusinessTransactions to be used.&#13;
For multi-party choreographies, a framework for analyzing synchronization dependencies then is available.&#13;
For binary choreographies, an ebBP refinement can be derived that fills in the technical parameters that are needed for deriving the implementation.&#13;
Finally, Web Services and BPEL based implementations can be generated.&#13;
Thus, CHORCH allows for stepwise closing the semantic gap between the information perspective of business process models&#13;
and the corresponding implementations.&#13;
&#13;
It is noteworthy that CHORCH uses international standards throughout all relevant layers, i.e., BPMN, ebBP, Web Services and BPEL,&#13;
which helps in bridging the heterogeneous IT landscapes of B2Bi partners.&#13;
In addition, the adoption of core CHORCH deliverables as international standards of the RosettaNet community&#13;
give testament to the practical relevance and promise dissemination throughout the B2Bi community.</description>
      <author>Andreas Schönberger</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/392</guid>
      <pubDate>Fri, 13 Jul 2012 14:05:53 +0200</pubDate>
    </item>
    <item>
      <title>Facettenbasierte Indexierung multipler Artefakte - Ein Framework für vage Anfragen in der Produktentwicklung</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/361</link>
      <description>Durch  den zunehmenden Einsatz von Informations- und Kommunikationstechnologien sowie den schnellen Technologiefortschritt steht die Entwicklung technischer Produkte vor immer neuen Herausforderungen. Dabei ist die Aufgabe der Produktentwicklung selbst als Problemlösungsprozess zu betrachten, in dem Lösungen mittels intensiver Informationsverarbeitung gefunden werden. Somit werden täglich unterschiedlichste Arten von Informationen erstellt, benötigt und verarbeitet, die primär in digitaler Form vorliegen. Diese werden in heterogenen Anwendungssystemen verwaltet, was eine Wiederverwendung bereits existierender Informationen erschwert. Damit beansprucht die  Suche nach Informationen  noch immer einen erheblichen Anteil der Entwicklungszeit.&#13;
Zur Verbesserung der Informationsversorgung im Bereich der technischen Produktentwicklung wird ein interaktives Information Retrieval-System – das LFRP-Framework – vorgestellt. Dieses kombiniert die vier Basiskonzepte der multiplen Ebenen, der facettierten Suche, des Rankings und der parallelen Koordinaten, um hochkomplexe  Informationsbedürfnisse zu befriedigen. Seine Realisierung erfordert neben einer geeigneten Suchoberfläche die Entwicklung einer Indexierungskomponente, welche die vorhandenen Informationen in eine für das LFRP-Framework rechnerverarbeitbare Form transformiert. Dieser als Indexierung bezeichnete Prozess stellt die Grundvoraussetzung für  die Funktionsfähigkeit eines Suchsystems dar und liegt daher im Fokus der Betrachtung. Es wird ein Lösungsansatz vorgestellt, welcher eine Indexierung in Form facettenbasierter Suchkriterien ermöglicht und dabei nicht nur Informationen aus heterogenen Anwendungssystemen, sondern insbesondere aus entwicklungsspezifischen Dokumenten, wie CAD-Modellen, technischen Zeichnungen oder Stücklisten, berücksichtigt.&#13;
</description>
      <author>Nadine Weber</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/361</guid>
      <pubDate>Fri, 15 Jun 2012 11:04:44 +0200</pubDate>
    </item>
    <item>
      <title>Interactive Search Processes in Complex Work Situations - A Retrieval Framework</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/292</link>
      <description>In recent years a steady increase of information produced in organizations can be noticed. In order to stay competitive, companies have a growing interest in reusing existing knowledge from past projects. Furthermore, a complete picture of the available information is necessary to be able to make informed decisions. The variety and complexity of information in modern organizations often exceeds the capabilities of the currently deployed enterprise search solutions. The reasons for that are manifold and range from non-linked information from multiple software systems to missing functionality to support users during search tasks. Existing search engines often do not support the search paradigms necessary in these environments. On many occasions, users are not aware of the results they will find during the formulation of the search queries. Additionally, the aspect of knowledge building and the identification of new insights into the available data is a priority for the users. Therefore, search paradigms are useful to provide users with tools that support exploratory navigation in a data set and help them to recognize relationships between search results. The goal of this publication is the introduction of a framework that supports exploratory searches in an organizational setting. The described LFRP-framework is built on top of four pillars. 1. The multi-layer functionality allows users to formulate complex search queries referring to more than one result type. Therewith, it enables search queries that - starting from a set of relevant projects - allow selections of documents that are linked to these projects. 2. The search paradigm of faceted searching supports users in formulating search queries incrementally by offering dynamic and valid filter criteria that avoid empty result sets. 3. By combining the concept of faceted search with the capability to influence the search result order based on filter criteria, users can define in a fine-grained way which criteria values shall be weighted stronger or weaker in the search results. The interaction with the ranking is conducted transparently by the so-called user preference functions. 4. The last pillar consists of the visualization type of parallel coordinates covering two tasks in the search user interface of the LFRP-Framework. On the one hand, users formulate their search queries solely graphically in the parallel coordinates and on the other hand they obtain a visual representation of the search results and are able to discover relationships between search results and their facets. The framework is introduced formally from a query model point of view as well as a prototypical implementation. It enables users to access large linked data sets by navigation and constitutes a contribution to a comprehensive information strategy for organizations.</description>
      <author>Raiko Eckstein</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/292</guid>
      <pubDate>Tue, 20 Sep 2011 15:43:21 +0200</pubDate>
    </item>
    <item>
      <title>A Service Description Method for Service Ecosystems - Meta Models, Modeling Notations, and Model Transformations</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/288</link>
      <description>Globalization and rapid technological change elevates the role of the Internet in terms of business service offering and procurement. At the same time, companies specialize on core competencies on the one hand, and on the other hand, integrate with other firms into “service ecosystems” in order to serve market needs in a flexible manner. One challenge in this setting is how to develop and describe novel business services within service ecosystems for efficient trade in services over the Internet. This work proposes a method for describing business services that integrates into business service development processes. The development of such a method leads to three major challenges: Firstly, it is necessary to determine which properties are appropriate for describing business services. This work analyzes existing approaches in the marketing, information systems, and computer science domain and develops a model for a formal description that facilitates offering and discovering of business services. Secondly, business service description elicitation, documentation, and communication must be provided for the whole business service development process. This work’s approach includes the development of an appropriate modeling notation as an extension of the Unified Modeling Notation (UML). Thirdly, there is a need for transforming business service descriptions into software realization languages that are suitable for the Internet. This contribution offers an automatic transformation of business service descriptions into Web Services Description Language (WSDL) documents using model-to-model transformation scripts. The method for describing business services was evaluated by implementing an integrated modeling environment along with related transformation scripts as well as by two case studies in the insurance and IT outsourcing industry.</description>
      <author>Gregor Scheithauer</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/288</guid>
      <pubDate>Fri, 15 Jul 2011 07:56:25 +0200</pubDate>
    </item>
    <item>
      <title>Gemeinschaftliche Qualitätsgesicherte Erhebung und Semantische Integration von Raumbezogenen Daten</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/285</link>
      <description>In den vergangenen Jahren ist die Verbreitung von mobilen Geräten mit integrierter Lokalisierungstechnologie (z.B. GPS) stark gestiegen. Jeder, der ein solches Gerät besitzt, kann zum Datenlieferanten werden und in einem Netzwerk von Freiwilligen, die Rolle eines Datensensors übernehmen. In der vorliegenden Dissertation werde ich zwei Problemstellungen näher betrachten, die im Kontext von raumbezogenen Daten, erhoben von Gemeinschaften aus fachlich (hier: geowissenschaftlich) nicht geschulten Nutzern, noch ungelöst sind: Wie können geowissenschaftliche Laien motiviert werden, freiwillig qualitätsgesicherte raumbezogene Daten zu erheben? Der erste Beitrag meiner Dissertation liefert eine Antwort auf diese Frage. Er beinhaltet ein Framework zum Design von ortsbezogenen Spielen, die geowissenschaftliche Laien motivieren, raumbezogene Daten qualitätsgesichert in spielerischer Art und Weise zu sammeln. Um es mit den Worten von Peltola et al. (2006) auszudrücken: ”game play is a natural motivator to participate in something that is not necessary or beneficial. [...] By controlling game events and perhaps game logics and rules, the agencies that ultimately use the gathered data, can steer players to do tasks supporting their needs“. Wie kann die Qualität von Sammlungen semantisch angereicherter raumbezogener Daten verbessert werden? Eine wichtige Eigenschaft von ortsbezogenen Spielen zur Datenerhebung ist die wiederholte Spielbarkeit. Im Gegensatz zu anderen Domänen ist nämlich die Erstellung redundanter Daten im raumbezogenen Kontext sogar erwünscht. Das Zusammenführen von Daten mehrerer Nutzer kann man als Mehrfachmessung auffassen, die sich dazu nutzen lässt, die Qualität von Lokalisierung (Wo?) und Kategorisierung (Was?) zu verbessern. Der zweite Beitrag meiner Dissertation gibt eine Antwort auf die Fragestellung und besteht in einem Ansatz zur semantischen Integration der gesammelten raumbezogenen Daten.</description>
      <author>Sebastian Matyas</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/285</guid>
      <pubDate>Tue, 05 Jul 2011 13:56:18 +0200</pubDate>
    </item>
    <item>
      <title>Dienstorientierte IT-Systeme für hochflexible Geschäftsprozesse</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/282</link>
      <description>Der vorliegende Band „Dienstorientierte IT-Systeme für hochflexible Geschäftsprozesse“ enthält ausgewählte Ergebnisse des Forschungsverbundes forFLEX aus den Jahren 2008 - 2011. Ausgehend von einer Charakterisierung des Forschungsfeldes und zwei fallstudienbasierten Anwendungsszenarien werden Fragen der Analyse, der Modellierung und Gestaltung sowie der Infrastruktur, Sicherheit und Werkzeugunterstützung von hochflexiblen Geschäftsprozessen und ihrer Unterstützung durch dienstorientierte IT-Systeme untersucht. Das Buch wendet sich an IT-Fach- und Führungskräfte in Wirtschaft und Verwaltung sowie an Wissenschaftler, die an der Analyse und Gestaltung von Flexibilitätspotenzialen (teil-) automatisierter Geschäftsprozesse interessiert sind.</description>
      <author>Dieter Bartmann; Freimut Bodendorf; Domenik Bork; Sebastian Duschinger; Otto K. Ferstl; Jochen Frank; Christian Herrmann; Andree Krücke; Matthias Kurz; Benjamin Leunig; Karl Mühlbauer; Corinna Pütz; Christian Senk; Elmar J. Sinz; Christian Suchan; Daniel Wagner; Stephan Weber</author>
      <category>book</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/282</guid>
      <pubDate>Thu, 16 Jun 2011 10:51:31 +0200</pubDate>
    </item>
    <item>
      <title>Entwicklung und Überprüfung von Kausalhypothesen: Gestaltungsoptionen für einen Analyseprozess zur Fundierung betrieblicher Ziel- und Kennzahlensysteme durch Kausalhypothesen am Beispiel des Performance-Managements</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/263</link>
      <description>Viele Unternehmen setzen moderne Performance-Management-Konzepte, wie zum Beispiel die Balanced Scorecard, ein. Hierbei werden Ursache-Wirkungs-Vermutungen aufgestellt, um nicht-finanzielle Kennzahlen zu identifizieren und deren Einfluss auf nachgelagerte Finanzkennzahlen abzubilden. Darüber hinaus werden kausale Abhängigkeiten zwischen Maßnahmen und Zielen in Form von Zweck-Mittel-Beziehungen unterstellt. Die hierfür benötigten Kausalhypothesen werden aber nicht systematisch, sondern meist assoziativ und allein auf Basis von Intuition entwickelt. Man verlässt sich auf vage Vermutungen und hypothetische Zusammenhänge, ohne diese zu überprüfen. Dies birgt die Gefahr einer Fehlsteuerung, indem nutzlose, konfliktäre oder sogar schädliche Maßnahmen aus den nur unzureichend begründeten Ziel- und Kennzahlbeziehungen abgeleitet werden. Es stellt sich daher die Frage, wie Unternehmen im Performance-Management ein anderer, systematischerer Umgang mit Ursache-Wirkungs-Beziehungen gelingen kann. Auf welchen Wegen können die benötigten Kausalhypothesen entwickelt und überprüft werden? Um diese Fragen zu beantworten, entwirft diese Arbeit einen generischen Performance-Management-Prozess, der Kausalhypothesen als zentrales Mittel zur ganzheitlichen Gestaltung und Lenkung der betrieblichen Performance nutzt. Daran anknüpfend werden Gestaltungsoptionen für einen Analyseprozess ausgearbeitet, der Kausalhypothesen evidenzbasiert entwickelt und überprüft. Der wesentliche Beitrag dieser Arbeit besteht darin, dass neben der Datenanalyse ein zweiter - und bis dato noch unbeschrittener - Weg zur Kausalanalyse vorgestellt wird: die modellzentrierte Kausalanalyse. Welche Synergien sich aus der Kombination modell- und datenzentrierter Analyseverfahren ergeben, insbesondere mit den Verfahren des On-Line-Analytical-Processing (OLAP) und Data-Minings, wird empirisch am Beispiel eines Sportartikelherstellers gezeigt.</description>
      <author>Thomas Voit</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/263</guid>
      <pubDate>Wed, 12 Jan 2011 10:58:24 +0100</pubDate>
    </item>
    <item>
      <title>Refactoring of Security Antipatterns in Distributed Java Components</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/216</link>
      <description>The importance of JAVA as a programming and execution environment has grown steadily over the past decade. Furthermore, the IT industry has adapted JAVA as a major building block for the creation of new middleware as well as a technology facilitating the migration of existing applications towards web-driven environments. Parallel in time, the role of security in distributed environments has gained attention, as a large amount of middleware applications has replaced enterprise-level mainframe systems. The protection of confidentiality, integrity and availability are therefore critical for the market success of a product. The vulnerability level of every product is determined by the weakest embedded component, and selling vulnerable products can cause enormous economic damage to software vendors. An important goal of this work is to create the awareness that the usage of a programming language, which is designed as being secure, is not sufficient to create secure and trustworthy distributed applications. Moreover, the incorporation of the threat model of the programming language improves the risk analysis by allowing a better definition of the attack surface of the application. The evolution of a programming language leads towards common patterns for solutions for recurring quality aspects. Suboptimal solutions, also known as ´antipatterns´, are typical causes for quality weaknesses such as security vulnerabilities. Moreover, the exposure to a specific environment is an important parameter for threat analysis, as code considered secure in a specific scenario can cause unexpected risks when switching the environment. Antipatterns are a well-established means on the abstractional level of system modeling to inform about the effects of incomplete solutions, which are also important in the later stages of the software development process. Especially on the implementation level, we see a deficit of helpful examples, that would give programmers a better and holistic understanding. In our basic assumption, we link the missing experience of programmers regarding the security properties of patterns within their code to the creation of software vulnerabilities. Traditional software development models focus on security properties only on the meta layer. To transfer these efficiently to the practical level, we provide a three-stage approach: First, we focus on typical security problems within JAVA applications, and develop a standardized catalogue of ´antipatterns´ with examples from standard software products. Detecting and avoiding these antipatterns positively influences software quality. We therefore focus, as second element of our methodology, on possible enhancements to common models for the software development process. These help to control and identify the occurrence of antipatterns during development activities, i. e. during the coding phase and during the phase of component assembly, integrating one´s own and third party code. Within the third part, and emphasizing the practical focus of this research, we implement prototypical tools for support of the software development phase. The practical findings of this research helped to enhance the security of the standard JAVA platforms and JEE frameworks. We verified the relevance of our methods and tools by applying these to standard software products leading to a measurable reduction of vulnerabilities and an information exchange with middleware vendors (Sun Microsystems, JBoss) targeting runtime security. Our goal is to enable software architects and software developers developing end-user applications to apply our findings with embedded standard components on their environments. From a high-level perspective, software architects profit from this work through the projection of the quality-of-service goals to protection details. This supports their task of deriving security requirements when selecting standard components. In order to give implementation-near practitioners a helpful starting point to benefit from our research we provide tools and case-studies to achieve security improvements within their own code base.</description>
      <author>Marc Schönefeld</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/216</guid>
      <pubDate>Wed, 19 May 2010 15:48:36 +0200</pubDate>
    </item>
    <item>
      <title>Modellbasierte Analyse von Führungsinformationssystemen: Ein Ansatz zur Bewertung auf der Grundlage betrieblicher Planungs- und Lenkungsprozesse</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/214</link>
      <description>Die Komplexität von Managementaufgaben steigt infolge zunehmender Einflüsse aus der Unternehmensumwelt und hieraus resultierenden innerbetrieblichen Zustandsänderungen. Um über eine zur Komplexitätsbeherrschung ausreichende Lenkungsvarietät verfügen zu können, wächst dementsprechend der qualitäts- und mengenbezogene Informationsbedarf des Managements. Führungsinformationssysteme unterstützen die Bereitstellung managementrelevanter Informationen, setzen allerdings voraus, dass für die Gestaltung dieser Systeme durchgängig betriebliche Geschäftsprozesse zugrunde gelegt werden. In der vorliegenden Arbeit wird die zuvor beschriebene Anforderung aufgegriffen und zunächst ein Vorgehen zur Transformation der Methodik der modellbasierten Geschäftsprozessuntersuchung von der Ebene der betrieblichen Leistungserstellung auf die Ebene der Planungs- und Lenkungsprozesse entwickelt. Durch dieses Vorgehen wird ermöglicht, Aufgaben der strategischen Lenkungsebene strukturieren und analysieren zu können. Weiterer Gegenstand der Untersuchung in der Arbeit ist die Bewertung des Führungsinformationssystems SAP SEM BPS/CPM anhand von Branchen-Referenzmodellen und Geschäftsprozessmodellen. Auf der Grundlage von Beobachtungsergebnissen aus der Branche ´Öffentliche Versorgung &amp; Infrastruktur´werden anhand von Referenzmodellen Gestaltungspotenziale der Software SAP SEM BPS/CPM abgeleitet. Im Rahmen der praxisorientierten Untersuchung eines Fallstudienunternehmens wird zudem der Anwendungsumfang von SAP SEM hinsichtlich der Faktoren Kosten, Zeit und Qualität evaluiert. Zur Analyse des Anwendungsumfangs werden Geschäftsprozessmodelle genutzt, deren Konstruktion auf der Methodik des Semantischen Objektmodells (SOM) basiert.</description>
      <author>Alexander Bach</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/214</guid>
      <pubDate>Mon, 10 May 2010 11:14:28 +0200</pubDate>
    </item>
    <item>
      <title>A Realistic Approach for the Autonomic Management of Component-Based Enterprise Systems</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/186</link>
      <description>During the last decades, information technology has been characterized by constantly increasing performance of available hardware resources. This development allows the assignment of more and more complex tasks to software systems while at the same time leading to a massive increase of inherent complexity of applied systems. The expected further increase of complexity in the future demands for an explicit addressing of complexity. The concept of Component Orientation represents an approach for complexity reduction during the development and configuration of software through functional decomposition. With the vision of Autonomic Computing there does exist an approach for addressing complexity during the operation and maintenance of software systems. In this context, the approach is based on the idea of assigning low level-management tasks to the managed system itself. The concept of Component Orientation leads to the establishment of system architectures out of clearly distinguishable building blocks. Therefore, Component Orientation seems to provide a promising foundation for realizing the vision of Autonomic Computing. This thesis presents a realistic infrastructure for the autonomic management of component-based enterprise systems. The application area of such systems leads to special requirements for managed systems and is highly affected by the complexity problem. As a foundation for the proposed approach, a well established component standard was chosen to guarantee the practical relevance of applied concepts and techniques. The applied standard is Enterprise JavaBeans, version 3.0. The proposed infrastructure is designed and realized in a generic fashion. It provides a platform upon which solutions for different application areas of Autonomic Computing can be realized. Autonomic entities are supported through a programming interface which represents a system on three interrelated levels and allows its management: On the top-level, the underlying software of a managed system is considered. The middle layer addresses the system architecture. Runtime interactions within the system are represented on the lowest layer. On this foundation, a system can be managed in a holistic, model-based way. The runtime management of a system is enabled through a specially developed component which must be integrated into the affected environment. This component is compliant with the applied component standard and does not require any adjustment of the underlying component platform. Finally, a tool is provided which supports the establishment of manageability through the automated execution of required adjustments of components. The management of a system is realized transparently for its constituent elements during runtime. On the whole, the development of enterprise software is not affected by a potential application of the presented infrastructure.</description>
      <author>Jens Bruhn</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/186</guid>
      <pubDate>Thu, 08 Oct 2009 10:35:07 +0200</pubDate>
    </item>
    <item>
      <title>Privacy-enhancing Technologies for Private Services</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/170</link>
      <description>Privacy on the Internet is becoming more and more important, as an increasing part of everyday life takes place over the Internet. Internet users lose the ability to control which information they give away about themselves or are even not aware that they do so. Privacy-enhancing technologies help control private information on the Internet, for example, by anonymizing Internet communication. Up to now, work on privacy-enhancing technologies has mainly focused on privacy of users requesting public services. This thesis introduces a new privacy risk that occurs when private persons run their own services. One example are instant messaging systems which allow users to exchange presence information and text messages in real time. These systems usually do not provide protection of presence information which is stored on central servers. As an alternative, decentralized instant messaging system designs mitigate this problem by having private persons provide instant messaging services to each other. However, providing a service as a private person causes new security problems as compared to providing a service as an organization or enterprise: First, the presence of such a service reveals information about the availability of the service provider. Second, the server location needs to be concealed in order to hide the whereabouts of a person. Third, the server needs to be specifically protected from unauthorized access attempts. This thesis proposes to use pseudonymous services as a building block for private services. Pseudonymous services conceal the location of a server that provides a specific service. The contribution made here is to analyze what parts of pseudonymous services, in particular Tor hidden services, are missing in order to apply them for private services. This analysis leads to three main problems for which solutions are proposed: First, known pseudonymous service designs do not scale to the expected number of private services which might be provided in the future. This thesis proposes a new approach to store hidden service descriptors in a distributed data structure rather than on central servers. A particular focus lies on the support of private entries which are required for private services. Second, pseudonymous services leak too much information about service identity during advertisement in the network and connection establishment by clients. The approach taken in this thesis is to reduce the information that a service publishes in the network to a minimum and prevent unauthorized clients from accessing a service already during connection establishment. These changes protect service activity and usage patterns from non-authorized entities. Third, pseudonymous services exhibit worse performance than direct service access. The contribution of this thesis is to measure performance, identify possible problems, and propose improvements.</description>
      <author>Karsten Loesing</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/170</guid>
      <pubDate>Wed, 27 May 2009 15:06:07 +0200</pubDate>
    </item>
    <item>
      <title>Überwindung semantischer Heterogenität bei multiplen Data-Warehouse-Systemen</title>
      <link>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/153</link>
      <description>Der bedarfsorientierte Zugriff auf ein konsolidiertes Berichtswesen stellt für betriebliche Organisationen einen entscheidenden Erfolgsfaktor dar, um einen Informationsvorsprung gegenüber ihren Wettbewerbern erzielen zu können. Data-Warehouse-Systeme (DWH-Systeme) dienen dazu, Entscheidungsträgern die für ihre aktuelle Aufgabe relevanten Informationen rechtzeitig und in geeigneter Form zur Verfügung zu stellen. In der Praxis existieren jedoch multiple DWH-Systeme, die vor allem auf Ebene der Datenschemata sowie der zugrunde liegenden Terminologien eine starke Heterogenität aufweisen. Inkonsistenzen zwischen den generierten Berichten sowie eine divergente Interpretation der Berichtsergebnisse sind die Folge. Der Aufbau eines konsolidierten Berichtswesens ist daher nur mit nachträglichem, manuellem Abstimmungsaufwand möglich. Die vorliegende Arbeit widmet sich insbesondere dem durch multiple DWH-Systeme offerierten Informationsangebot. Mithilfe der im Semantic Web etablierten Technologie Resource Description Framework (RDF) und der Web Ontology Language (OWL) wird ein Rahmen zur semantisch reichhaltigen Beschreibung von DWH-Metadaten geschaffen. Derartig ausgezeichnete Metadaten unterschiedlicher DWH-Systeme werden anschließend in einer semantischen Homogenisierungsschicht (sHGS) zusammengeführt. Mit diesem Hilfsmittel können Beziehungen zwischen multiplen DWH-Systemen identifiziert und deren semantische Heterogenität überwunden werden.</description>
      <author>Stefan Hartmann</author>
      <category>doctoralthesis</category>
      <guid>http://opus4.kobv.de/opus4-bamberg/frontdoor/index/index/docId/153</guid>
      <pubDate>Mon, 12 Jan 2009 16:30:46 +0100</pubDate>
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