Ulrike Steffens

Ulrike Steffens
Hochschule für Angewandte Wissenschaften Hamburg | HAW · Department of Computer Science

About

39
Publications
4,593
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273
Citations

Publications

Publications (39)
Conference Paper
Full-text available
Analyzing and understanding large-scale, distributed business applications and enterprise architectures is particularly important to align an enterprise's overall business with the supporting IT infrastructure. It is necessary to model and simulate the dynamic complexity properly as well as capture possible emergent effects in real-world enterprise...
Article
In present Enterprise Architecture Management there is a conceptual gap between very complex methodologies on the one hand and usually methodology-agnostic query-based tool support on the other hand. As a result, Enterprise Architecture Management is often unable to tap its full potential. Issues for possible improvement are described in this paper...
Conference Paper
The paradigm of service orientation is heavily used to design complex IT systems able to satisfy the need for an agile business support. Many enterprises have established service-oriented architectures (SOAs) of different size and complexity. However, such SOAs need efficient management and the discipline of enterprise architecture management has o...
Conference Paper
Full-text available
The transfer from the current power grid to the power grid of the future implicates major changes for all stakeholders participating in the smart grid. Hence, utilities have to face several novel problems in terms of service provision. In this contribution, we examine two complementary views in the overall context of smart grids. We argue for a com...
Conference Paper
Full-text available
For many enterprises, introduction and maintenance of service orientation is still a daunting task and there is often no distinct idea of how to approach respective projects. Especially the migration of legacy systems functionality into a new service-oriented environment - the SOA enabling - is key to the success of SOA projects. Another challenge...
Conference Paper
For many enterprises the introduction of service orientation is still a daunting task and there is often no distinct idea of how to approach respective projects. Only recently, SOA research addresses this open and essential question and systematic methodologies for SOA introduction and evolution have been conceived. IBM's SOMA and sd&m's Quasar Ent...
Conference Paper
Full-text available
Rigorous modelling techniques and specialised analysis methods support enterprise architects when embarking on enterprise architecture management (EAM). Yet, while customised modelling solutions provide scalability, adaptability and flexibility they are often in conflict with generic or reusable visualisations. We present an approach to augment cus...
Conference Paper
Full-text available
The complexity of today's enterprise application landscapes makes the selection of new applications which still fit into the existing landscape a complex and daunting task. In this paper, we present an approach to support this task by a two-phase landscape-dependent evaluation process. In the initial phase single characteristics of the landscape's...
Chapter
Full-text available
Digital Libraries (DLs) in eHealth are composed of electronic artefacts that are generated and owned by different healthcare providers. A major characteristic of eHealth DLs is that information is under the control of the organisation where data has been produced. The electronic health record (EHR) of patients therefore consists of a set of distrib...
Conference Paper
Full-text available
Digital Libraries (DLs) in eHealth are composed of electronic artefacts that are generated and owned by different healthcare providers. A major characteristic of eHealth DLs is that information is under the control of the organisation where data has been produced. The electronic health record (EHR) of patients therefore consists of a set of distrib...
Conference Paper
With continuously growing numbers of applications, enterprises face the problem of efficiently managing the assignment of access permissions to their users. On the one hand, security demands a tight regime on permissions; on the other hand, users need permissions to perform their tasks. Role-based access control (RBAC) has proven to be a solution t...
Article
Full-text available
Knowledge is a very key in nearly every business process. The flow of knowl- edge in process is supported by various so called knowledge assets which embody either implicit knowledge which is bound to persons or explicit knowledge which is incorpo- rated in organizational documents, handbooks or code artifacts. A large store of knowl- edge assets,...
Conference Paper
Full-text available
The transition from traditional paper libraries to digital li- braries enables new strategies for the use and maintenance of artifact col- lections. Distributed software development can be regarded as a special case of digital library utilization, where developers or groups of develop- ers are working on the same software geographically dispersed i...
Conference Paper
The transition from traditional paper libraries to digital li- braries enables new strategies for the use and maintenance of artifact col- lections. We present an organization-oriented super-peer network which represents the organizational structures of distributed digital libraries in a natural way and is able to integrate distributed resources as...
Article
Full-text available
Web services and related technologies are a ubiqui- tous topic within the IT community. Due to their flexible system composition characteristics these technologies can be considered a promising building block for the dy- namic networking of people and organizations in our in- creasingly globalized and quickly changing economies. With the growing nu...
Article
define, describe, design, induce, map, mirror, model, recall, represent, visualize Audit, configure, control, coordinate, distribute, economize, improve, maintain, manage, manipulate, optimize, organize, plan, regulate, set, set up, structure Accelerate, rename, shape, format, filter, synchronize Authenticate, authorize, check, compare, indicate, m...
Conference Paper
In this paper we present an interactive tool for policy-based merging of resource-classifying networks (RCNs). We motivate our approach by identifying several merge scenarios within organizations and discuss their individual requirements on RCN merge support. The quality-controlled merging of RCNs integrates the contributions from different authors...
Conference Paper
This text motivates and defines a generic model for interactive (online or offline) product catalogs. Based on a detailed requirements analysis, the data model is defined using an object-oriented design notation and the query language for expressing customer interests on the catalog is defined using techniques from fuzzy set theory. The model provi...
Conference Paper
Rooted in the principle of hypertext, linked information is almost ubiquitous due to the WWW and related services. Links between information objects are established for various reasons, aspects of which are encoded by a link type or expressed through link context, e.g., by the surrounding content. Such reasons may lose their validity through conten...
Article
Full-text available
In databases and traditional paper documents, an index is often tightly coupled with the information resources being indexed. Digital libraries require a generalized notion of indexing that is suitable for distributed and heterogeneous collections. The main contribution of the generalization described in this paper is to introduce an additional int...
Conference Paper
This text motivates and defines a generic model for interactive (online or offine) product catalogs. Based on a detailed requirements analysis, the data model is defined using an object-oriented design notation and the query language for expressing customer interests on the catalog is defined using techniques from fuzzy set theory. The model provid...
Article
D'abord l'article traite de la solution de problemes de recherche a l'aide de l'information Retrieval. Les considerations necessaires pour l'emploi de l'Information Retrieval sont esquissees ainsi que les concepts de solution et des modeles. Les systemes WAIS et INQUERY sont presentes brievement. Enfin, les avantages de l'integration des systemes d...
Article
Full-text available
Kurzfassung Modellgetriebene Entwicklungsverfahren zur Integration bestehender heterogener betriebli-cher Informationssysteme können insbesondere für KMU eine wesentliche Unterstützung dar-stellen, da sie den flexiblen Umgang mit sich rasch ändernden Anforderungen vor dem Hin-tergrund gewachsener Systemlandschaften erlauben. Im vorliegenden Beitrag...

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