Ulrike Lechner

“Virtual Communities with a Mission ” in the Health Care Sector (2008)

Media are explored as model to envision, to design, to formalize and to implement platforms for communities. We consider communities of both natural and artificial agents and aim at designing media...

Achim Dannecker, Ulrike Lechner

Abstract: Virtual communities can take over various roles in the health care sector. We develop the concept of a virtual community with a mission, i.e. a community that actively pursues objectives in...

SUCCESS FACTORS OF COMMUNITES OF PATIENTS (2008)

Achim Dannecker, Ulrike Lechner

This paper presents results of an empirical study regarding success factors of virtual communities of patients. These success factors capture what is important to members of virtual communities of...

An Approach to Overcome Basic Barriers in E-Commerce and Collaboration Applications (2008)

Michael Moeslein, Kathrin Schubert, Petra Lechner, Ulrike Identities, Michael Koch, Kathrin Moeslein, ...

The development of the Internet was originally based on the assumption that users remain anonymous. In the real world, however, people always have an identity – often even more than one. The...

Voice over IP – Infrastructure vs. Market Service? (2008)

Achim Dannecker, Sean Eikenberg, Ulrike Lechner, Tino Gieslor, Leonhard Mertz

Abstract: Voice over IP is a new communication technology. Today it is mainly utilized as a new infrastructure for telephony. It can be integrated in services, adapted to support business processes....

Amar Shubar and Ulrike Lechner 1 Business Systems for Public WLAN Network Operators (2008)

Business Models for the Public WLAN Market (2008)

WLAN is a radical technology, enabling new ways to provide mobile access. A number of established and new companies have entered the mobile market with new business models. It is yet not clear how...

Business Models for the Public WLAN Market (2008)

WLAN is a radical technology, enabling new ways to provide mobile access. A number of established and new companies have entered the mobile market with new business models. It is yet not clear how...

Criteria, Concepts and Constructs for Reuse in Concurrent Object-Oriented Languages (2007)

Short-range wireless technologies such as IEEE 802.11, HyperLAN, HomeRF, Bluetooth, etc. are designed to cover areas with a diameter from 10 to a few hundred meters 1. WLAN technologies cover-...

**Fakultt fr Mathematik und Informatik (2007)

. bla Keywords: Concurrent rewriting, -calculus, abstract interpretation, inheritance anomaly, reusability. 1 Introduction Responsible for this is the synchronization code, which implements the...

Martin Wirsing, Friederike Nickl, Ulrike Lechner

In this paper an algebraic approachp formal object-oriented design specification is presented where thee 288 and functional part of a software system is described by classicalssical 2 specification...

Media { Formalization and Architecture (2007)

Specification, Abstraction and Verification in a Concurrent Object-Oriented Language (2007)

Abstract. Media are explored as model to envision, to design and to formalize platforms for communities of collaborating human or articial agents. Seminal to our approach are the media concept and...

Ulrike Lechner, Christian Lengauer

We use Maude as our specification language and the modal-calculus as our logic. We apply to specifications in Maude a framework of abstraction and verification based on property-preserving mappings...

An Empirical Analysis of the Demand for E-Services for Virtual Communities of Patients Abstract (2006)

Achim Dannecker, Ulrike Lechner

Virtual communities of patients provide health-related information and mutual support for members. This paper presents a structured analysis of virtual communities of patients and the demand for...

The Public WLAN Market And Its Business Models - An Empirical Study." 17th Bled eCommerce Conference (2004)

Business Model Peer-to-Peer Is there a future beyond filesharing? (2003)

Wireless local area network (WLAN) is a radical technology, enabling new ways to provide mobile access. A number of established and new companies have entered the mobile market with new business...

Johannes C. Hummel, Claus Eikemeier, Ulrike Lechner

Today, the main application domain of Peer-to-Peer(p2p) networks is filesharing. It is an open question whether there are applications for this technology beyond filesharing and whether the p2p...

The Community Model of Content Management. A case study of the music industry (2003)

The IKnow-Tool: Connecting Software Engineers with Peer-to-Peer Software for AdHoc Collaboration (2003)

Information and communication technology not only provides new kinds of content, but also new designs for the production, packaging, multiplying and distribution of it. As a consequence, novel...

Claus Eikemeier, Ulrike Lechner, Florian Beyerlein, Michael Lodde

Practical software engineering often demands for ad-hoc answers to suddenly arising questions. In small and mostly distributed programming teams it is quite common to use an instant messaging (IM)...

A Reference Model for Online Learning Communities (2002)

Sabine Seufert, Ulrike Lechner, Katarina Stanoevska-Slabeva

Elektronische Märkte (2002)

Beat F. Schmid, Katarina Stanoevska-Slabeva, Ulrike Lechner, Sabine Seufert

Einführung in die Managementlehre: Elektronische Märkte (2002)

Sabine Seufert, Ulrike Lechner, Beat F. Schmid, Katarina Stanoevska-Slabeva

Die Universität St. Gallen hat anlässlich der Neukonzeption des Studiums ein neues Lehrbuch für die einführende Ausbildung auf der zukünftigen BWL-Assessmentstufe (erstes Studienjahr)...

Peer-to-Peer-Architekturen für Kollaborationen (2002)

Social Profiles of Virtual Communities (2002)

File-sharing of MP3s

An Investigation into Mobile Communities (2002)

The phenomenon "virtual community" reflects the social, political and economic impact of information and communications technology changing the architecture of interaction. Pure transactions can be...

Communities - Business Models and System Architectures: From a sociological phenomenon to peer-to-peer architectures (2002)

Mobile communities supposedly are one of the urgently sought after killer applications for mobile commerce. In this paper we review virtual communities and the first examples for mobile communities...

Book Review: Business Information Technology Management Alternative and Adaptive Futures (2002)

Information and communication technology provides design options for the creation of economic value. We analyze the impact of technology on the design of business models. In the business model...

A Reference Model for Online Learning Communities (2002)

"As Bernhard Shaw suggested, prophecy is a dangerous thing." Ray Hachney and Dennis Dunn edited "Business Information Technology Management - Alternative and Adaptive Futures" to be an approach to...

Sabine Seufert, Ulrike Lechner, Katarina Stanoevska

Information and communication technology renews society and, with it, the skills expected to be developed in education. The new platforms for communication provide ubiquity and persistence for...

A Reference Model for Online Learning Communities (2002)

Sabine Seufert, Ulrike Lechner, Katarina Stanoevska

Abstract: Online learning communities are introduced as a comprehensive model for technology-enabled learning. We give an analysis of goals in education and the requirements to community platforms....

Die Schweiz und die Branchenkonvergenz im Medienbereich (2001)

Communities - Business Models and System Architectures: The Blueprint of MP3.com, Napster and Gnutella Revisited (2001)

Die neue Industrialisierung veraendert den Warenkorb der Konsumprodukte: Wie die erste Industrialisierung den Warenkorb der Agrargesellschaft grundlegend veraendert hat, so werden digitale Produkte...

The community model of media management. A case study of the music industry. (2001)

Information and communication technology opens up an unprecedented space of design options for the creation of economic value. The business model "community" and the role "community organizer" are...

The Community Model of Content Management - A case study of the music industry (2001)

Peer-to-peer architectures for sharing music illustrate how quickly consumers adopt novel structures as long as the architectures provide clear incentives for adoption. MP3.com, Napster, and...

Communities - The Role of Technology (2001)

Information and communication technology not only provides new kinds of content, but also new designs for the production, packaging, multiplying and distribution of it. As a consequence, novel...

Johannes Hummel, Ulrike Lechner

Information and communication technology provides design options for the creation of economic value. We consider a particular architecture for the creation of economic value: the communication model...

The Community Model of Content Management - A case study of the music industry (2001)

Johannes Hummel, Ulrike Lechner

Information and communication tech-nology not only provides new kinds of content, but also new designs for the production, packaging, multiply-

Editorial (2000)

Ulrike Lechner, Katarina Stanoevska-Slabeva, Yao-Hua Tan

Ein Glossar für die NetAcademy - Issue 3/2000 (2000)

Beat F. Schmid, Salome Schmid-isler, Katarina Stanoevska-Slabeva, Hans-dieter Zimmermann, Ulrike Lechner, Martin Eppler, ...

This glossary, version 3.0, is a revised version of the glossary version 2.0 dating of October 30, 1998. It accumulates the term definitions which are displayed in the NetAcademy's online glossary...

Communities and Media - Towards a Reconstruction of Communities on Media (2000)

Ein Glossar für die NetAcademy - Issue 3/2000 (2000)

Media are explored as model to envision, to design, to formalize and to implement platforms for communities. We consider communities of both natural and artificial agents and aim at designing media...

Hans-Dieter Zimmermann, Markus Will, Martin Eppler, Ulrike Lechner, Beat F. Schmid, Salome Schmid-Isler, ...

This glossary, version 3.0, is a revised version of the glossary version 2.0 dating of October 30, 1998. It accumulates the term definitions which are displayed in the NetAcademy's online glossary...

Organization on Intranet - An Agent based approach (2000)

Martina Klose, Christos Kefos, Reinhard Riedl, Lutz Richter, Elisabeth Maier, Urs Hengartner, ...

With Intranets as communication channels inhabited by an ensemble of agents, we present a concept to envision, model and implement comunication channels for organizations. The approach is based on...

EM Editorial - Vol. 10, No. 4 (2000)

Yao-Hua Tan, Ulrike Lechner, Katarina Stanoevska-Slabeva

Dear readers, The special section of this issue (Vol. 10, Issue 4) explores community building and community development, i.e., community management as a key success factor in the digital economy....

Ökologische Konsumentengemeinschaften (2000)

Communities and Media - Towards a Reconstruction of Communities on Media (2000)

The way the use the internet for the ecological movement.

Media - A Formal Model of Communities and Platforms (1999)

Media are explored as model to envision, to design, to formalize and to implement platforms for communities. We consider communities of both natural and artificial agents and aim at designing media...

Beat F. Schmid, Martina Klose, Ulrike Lechner

Ein Glossar für die NetAcademy - Issue 2/1999 (1999)

Beat F. Schmid, Salome Schmid-isler, Katarina Stanoevska-Slabeva, Hans-dieter Zimmermann, Martin Eppler, Ulrike Lechner, ...

This glossary, version 2.0, is a second and revised version of the glossary version 1.0 dating of March 23rd, 1998. It accumulates the term definitions which are displayed in the NetAcademy's online...

Ein Referenzmodell für Gemeinschaften und Medien - Case Study Amazon.com (1999)

Beat F. Schmid, Ulrike Lechner, Martina Klose, Petra Schubert

The new ICT establishes new platforms to transport information, this it establishes new machines to process information. Economic phenomena of e-Business and e-Commerce illustrate the power and the...

Structuring and Systemizing Knowledge - Realizing the Encyclopedia concept as a Knowledge Medium (1999)

Beat F. Schmid, Salome Schmid-isler, Katarina Stanoevska-Slabeva, Ulrike Lechner

We reconsider the encyclopedic concept as a knowledge medium for the scientific community in the Internet. Referring to the ancient concept of encyclopedia, we reconstruct the encyclopedia for the...

Analyse und Modellierung von Geschaeftsmedien (1999)

Beat F. Schmid, Martina Klose, Ulrike Lechner, Christoph P. Hoffmann, Yingzi Xu, Hans-dieter Zimmermann

Mit Medien fuehren wir ein ganzheitliches, technologische und betriebswirtschaftliche Gesichtspunkte beruecksichtigendes Konzept zur Modellierung von Organisationsformen sowie deren Informations- und...

Analyse und Modellierung von Geschaeftsmedien (1999)

Hans-Dieter Zimmermann, Martina Klose, Christoph P Hoffmann, Ulrike Lechner, Beat F. Schmid

Mit Medien fuehren wir ein ganzheitliches, technologische und betriebswirtschaftliche Gesichtspunkte beruecksichtigendes Konzept zur Modellierung von Organisationsformen sowie deren Informations- und...

Structuring and Systemizing Knowledge - Realizing the Encyclopedia concept as a Knowledge Medium (1999)

Ulrike Lechner, Beat F. Schmid, Salome Schmid-Isler, Katarina Stanoevska-Slabeva

We reconsider the encyclopedic concept as a knowledge medium for the scientific community in the Internet. Referring to the ancient concept of encyclopedia, we reconstruct the encyclopedia for the...

Ein Glossar für die NetAcademy - Issue 2/1999 (1999)

Hans-Dieter Zimmermann, Markus Will, Martin Eppler, Ulrike Lechner, Beat F. Schmid, Salome Schmid-Isler, ...

This glossary, version 2.0, is a second and revised version of the glossary version 1.0 dating of March 23rd, 1998. It accumulates the term definitions which are displayed in the NetAcademy's online...

Media - A Formal Model of Communities and Platforms (1999)

Martina Klose, Ulrike Lechner, Beat F. Schmid

Internet provides the means to transport information over space and time, and world wide web has established itself as a universal service for representing and communicating information. While there...

Ein Referenzmodell für Gemeinschaften und Medien - Case Study Amazon.com (1999)

Martina Klose, Petra Schubert, Ulrike Lechner, Beat F. Schmid

The new ICT establishes new platforms to transport information, this it establishes new machines to process information. Economic phenomena of e-Business and e-Commerce illustrate the power and the...

Softmedia - An Architecture for Robust Media (1999)

Martina Klose, Ulrike Lechner

Media are metaphors and models for communities of agents and their platforms. They are modelled as multi-agent systems. Techniques and concepts to deal with incomplete and inconsistent information...

Architecture and Informal Specification of Matching (1999)

Martina Klose, Ulrike Lechner

Matching is analyzed to be a central service for new media, i.e. information systems of all kinds. An architecture for a matching service together with an informal specification of the matching...

Logic for Media - The Computational Media Metaphor (1999)

New Business Media for Logistics Services (1999)

New media as they are established by information and communications technology demand for reconsidering the notion of a medium as a carrier of information and with it the concepts for representation,...

Martina Klose, Daniel Corsten, Christoph P Hoffmann, Julian Pötzl, Ulrike Lechner

Information and communication technology (ICT) is changing communication and interaction in private and business behavior. Innovative technologies and organizations gain importance within business...

Logic for Media. The Computational Media Metaphor (1999)

Logic for Media. The Computational Media Metaphor (1999)

Abstract: New media as they are established by information and communications technology demand for reconsidering the notion of a medium as a carrier of information and with it the concepts for...

Logic for Media - The Computational Media Metaphor (1999)

Abstract: New media as they are established by information and communications technology demand for reconsidering the notion of a medium as a carrier of information and with it the concepts for...

Ulrike Lechner, Beat F. Schmid, Muller Friedberg Str, Muller Friedberg Str

: New media as they are established by information and communications technology demand for reconsidering the notion of a medium as a carrier of information and with it the concepts for...

A Computational Media Metaphor (1998)

Beat F. Schmid, Ulrike Lechner

The NetAcademy - A New Concept for Online Publishing and Knowledge Management (1998)

Beat F. Schmid, Katarina Stanoevska-Slabeva, Siegfried Handschuh, Ulrike Lechner, David-Michael Lincke, Petra Schubert, ...

Traditional media have concepts to ensure quality of information they carry, while new media make information ubiquitious. The NetAcademy project constitutes a new medium for knowledge accumulation...

The NetAcademy - A New Concept for Online Publishing and Knowledge Management (1998)

David Lincke, Siegfried Handschuh, Dorian Selz, Petra Schubert, Ulrike Lechner, Beat F. Schmid, ...

Traditional media have concepts to ensure quality of information they carry, while new media make information ubiquitious. The NetAcademy project constitutes a new medium for knowledge accumulation...

A Computational Media Metaphor (1998)

Constructs, Concepts and Criteria for Reuse in Concurrent Object Oriented Languages (1998)

The notion of a medium and with it the concepts of representation, accumulation and dissemination of knowledge have been hanging, fostered by the medium computer as a new carrier of information. The...

The NetAcademy { a new concept for online publishing and knowledge management (1998)

For reuse in concurrent object-oriented languages we present a set of reuse constructs. We give criteria for relations between classes that can be implemented by those reuse constructs, characterize...

Siegfried H, Ulrike Lechner, David-michael Lincke, Beat Schmid, Petra Schubert, Dorian Selz, ...

downloaded from www.netacademy.org This document has been downloaded from the NetAcademy at

The NetAcademy { a new concept for online publishing and knowledge management (1998)

Siegfried H, Ulrike Lechner, David-michael Lincke, Beat Schmid, Petra Schubert, Dorian Selz, ...

Abstract. Traditional media have concepts to ensure quality of information they carry, while new media make information ubiquitious. The NetAcademy project constitutes a new medium for knowledge...

Object-Oriented Specification of Distributed Systems (Extended Abstract) (1998)

Constructs, Concepts and Criteria for Reuse in Concurrent Object-Oriented Languages (1998)

The object-oriented concurrent paradigm demands for a new object model and for reconsidering object-oriented techniques. We present an abstract, object-oriented style of modeling distributed systems...

Object-oriented specification of distributed systems /--U. Lechner. (1997)

For reuse in concurrent object-oriented languages we present a set of reuse constructs. We give criteria for relations between classes that can be implemented by those reuse constructs, characterize...

Lechner, Ulrike.

Cover title.

Object-oriented specification of distributed systems (1997)

Lechner, Ulrike

Specification, Abstraction and Verification in a Concurrent Object Oriented Language (1997)

Christian Lengauer, Ulrike Lechner

We use Maude as our specification language and the modal mu-calculus as our logic. We apply to specifications in Maude a framework of abstraction and verification based on property-preserving...

Object Oriented Specification of Distributed Systems (1997)

Object-Oriented Speci cation of Distributed Systems (1997)

Since object-oriented languages model worlds of interacting, independent objects, admitting concurrency in such languages seems to be straightforward. But the integration of concurrency and...

Object Oriented Specificatons of Distributed Systems in the mu-Calculus and Maude (1996)

We re ne an abstract property-oriented speci cation in the-calculus to a speci cation in Maude. As an intermediate step, we use a structured speci cation in the-calculus blended with propositions on...

Modal-mu-Maude, Properties and Specification of Concurrent Objects (1996)

We refine an abstract property-oriented specification in the mu-calculus to a specification in Maude. As an intermediate step, we use a structured specification in the mu-calculus blended with...

Christian Lengauer, Ulrike Lechner

Since object-oriented languages model worlds of interacting, independent objects, admitting concurrency in such languages seems to be straightforward. But, in practice, the integration of concurrency...

Objects & Concurrency & Reusability -- A Proposal to Circumvent the Inheritance Anomaly (1996)

Martin Wirsing, Christian Lengauer, Friederike Nickl, Ulrike Lechner

We enrich the object-oriented concurrent specification language Maude with language constructs for reuse and gain a high degree of code reusability. We consider three reuse constructs: (1) Maude's...

Specification, Abstraction an Verification in a Concurrent Object Oriented Language (1996)

Christian Lengauer, Ulrike Lechner

We use Maude as our specification language and the modal mu-calculus as our logic. We apply to specifications in Maude a framework of abstraction and verification based on property-preserving...

Object-Oriented Specifications of Distributed Systems in the µ-Calculus and Maude (1996)