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Dive into the research topics where Wilfried Lemahieu is active.

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Featured researches published by Wilfried Lemahieu.


conference on advanced information systems engineering | 2008

On the Definition of Service Granularity and Its Architectural Impact

Raf Haesen; Monique Snoeck; Wilfried Lemahieu; Stephan Poelmans

Service granularity generally refers to the size of a service. The fact that services should be large-sized or coarse-grained is often postulated as a fundamental design principle of service oriented architecture (SOA). However, multiple meanings are put on the term granularity and the impact of granularity on architectural qualities is not always clear. In order to structure the discussion, we propose a classification of service granularity types that reflects three different interpretations. Firstly, functionality granularityrefers to how much functionality is offered by a service. Secondly, data granularityreflects the amount of data that is exchanged with a service. Finally, the business value granularityof a service indicates to which extent the service provides added business value. For each of these types, we discuss the impact of granularity on a set of architectural concerns, such as performance, reusability and flexibility. We illustrate each granularity type with small examples and we present some preliminary ideas of how controlling granularity may assist in alleviating some architectural issues as we encounter them in a large-sized bank-insurance company that is currently migrating to SOA.


Information Systems Frontiers | 2006

Management and enterprise architecture click: The FAD(E)E framework

Frank Goethals; Monique Snoeck; Wilfried Lemahieu; Jacques Vandenbulcke

Enterprises are living things. They constantly need to be (re-)architected in order to achieve the necessary agility, alignment and integration. This paper gives a high-level overview of how companies can go about doing ‘enterprise architecture’ in the context of both the classic (isolated) enterprise and the Extended Enterprise. By discussing the goals that are pursued in an enterprise architecture effort we reveal some basic requirements that can be put on the process of architecting the enterprise. The relationship between managing and architecting the enterprise is discussed and clarified in the FAD(E)E, the Framework for the Architectural Development of the (Extended) Enterprise.


Post-Print | 2005

An Overview of Enterprise Architecture Framework Deliverables

Frank Goethals; Wilfried Lemahieu; Monique Snoeck; Jacques Vandenbulcke

A number of enterprise architecture frameworks do exist. In this paper, we differentiate between two classes of frameworks: classic enterprise architecture frameworks, and federated enterprise architecture frameworks. From each class, a number of reputable frameworks are presented. Conclusions are made concerning what these frameworks learn us for setting up an Extended Enterprise architecture framework.


International Journal of E-business Research | 2005

Two basic types of business-to business integration

Frank Goethals; Jacques Vandenbulcke; Wilfried Lemahieu; Monique Snoech; Bjorn Cumps

In this paper we argue that there exist two basic forms of business-to-business integration (B2Bi), namely, extended enterprise integration and market B2Bi. The paper at hand clarifies the meaning of both concepts, shows that the difference between both is fundamental, and discusses the consequences of the difference in the realm of Web services development. The importance of coordination and the role of standards are studied for both types of e-business. The authors hope this paper clearly shows the foundations of B2Bi, and that the paper as such brings clarity into B2Bi practices. (This abstract was borrowed from another version of this item.)


Information & Management | 2013

A multidimensional analysis of data quality for credit risk management: New insights and challenges

Helen Tadesse Moges; Karel Dejaeger; Wilfried Lemahieu; Bart Baesens

Recent studies have indicated that companies are increasingly experiencing Data Quality (DQ) related problems as more complex data are being collected. To address such problems, the literature suggests the implementation of a Total Data Quality Management Program (TDQM) that should consist of the following phases: DQ definition, measurement, analysis and improvement. As such, this paper performs an empirical study using a questionnaire that was distributed to financial institutions worldwide to identify the most important DQ dimensions, to assess the DQ level of credit risk databases using the identified DQ dimensions, to analyze DQ issues and to suggest improvement actions in a credit risk assessment context. This questionnaire is structured according to the framework of Wang and Strong and incorporates three additional DQ dimensions that were found to be important to the current context (i.e., actionable, alignment and traceable). Additionally, this paper contributes to the literature by developing a scorecard index to assess the DQ level of credit risk databases using the DQ dimensions that were identified as most important. Finally, this study explores the key DQ challenges and causes of DQ problems and suggests improvement actions. The findings from the statistical analysis of the empirical study delineate the nine most important DQ dimensions, which include accuracy and security for assessing the DQ level.


acm symposium on applied computing | 2004

Developing the extended enterprise with the FADEE

Frank Goethals; Jacques Vandenbulcke; Wilfried Lemahieu

In realizing Business-to-Business integration, much communication among persons with different backgrounds is needed. We affirm that Enterprise Architecture Descriptions are an important part of the necessary communication in information systems development and maintenance. This article is about categorizing the models that describe Business-to-Business integration (B2Bi) practices, and identifying the numerous ways B2Bi issues could and should be described. The framework we propose is based on lessons learnt from proven architecture description frameworks. The Zachman framework forms the basis of the Framework for the Architectural Description of the Extended Enterprise (the FADEE) presented in this paper. It changes the communication between CIO and CEO, what results in more involvement of the CIO in the strategy making process.


international conference on web services | 2007

Coordinated Web Services Orchestration

Geert Monsieur; Monique Snoeck; Wilfried Lemahieu

In a business process execution language (BPEL) process definition the sequence of exchanged messages typically originates from the sequence of business process activities and from the need of coordination of those activities across the participants of the process. As such business concerns (e.g. the sequence of business process steps) are of en mixed with technical aspects (e.g. the sequence of coordination messages). In this article we present an architecture to separate business and technical concerns, which results in a clearer overview of the high-level business process and improves the flexibility and maintainability of the orchestration architecture. The described architecture depends on existing Web service standards. Different eventing and coordination specifications are discussed. The ultimate architecture is mainly based on the WS-Brokered Notification and WS-Coordination framework specifications.


asia pacific web conference | 2003

An event based approach to web service design and interaction

Wilfried Lemahieu; Monique Snoeck; Cindy Michiels; Frank Goethals

This paper advocates an approach to web service design and interaction that is based on web services simultaneously participating in shared business events. In contrast to one-to-one method invocations, such events are broadcast in parallel to all web services that participate in it. Moreover, the transactional business events are distinguished from non-transactional attribute inspections. The paper first discusses the role of the business event concept as the cornerstone for a methodical analysis and design phase. Then, it is shown how the event broadcasting paradigm can be implemented by means of SOAP messaging.


Computer Networks | 2002

Context-based navigation in the Web by means of dynamically generated guided tours

Wilfried Lemahieu

Abstract A key advantage of hypermedia systems such as the Web is that the user is able to navigate through the information space in a non-linear fashion. He can explore the interlinked documents according to his own interests and insights, instead of being confined to the rigid, linear structure of, e.g., pages in a book. A downside, however, is that this navigational freedom entails the risk of disorientation, especially in a gigantic hypertext such as the Web. This paper presents a context-based navigation paradigm for the Web and reconciles navigational freedom with a measure of linear guidance to prevent the user from becoming disoriented. For that purpose, “conventional” navigation along static links is complemented by run-time generated guided tours, which are derived dynamically from the context of a users information requirements.


Lecture Notes in Computer Science | 2003

Event Based Web Service Description and Coordination

Wilfried Lemahieu; Monique Snoeck; Cindy Michiels; Frank Goethals; Guido Dedene; Jacques Vandenbulcke

This paper proposes the concept of business events as the cornerstone to web service description and coordination. First, a web service architecture is introduced as the result of an event based analysis & design phase. Then, it is advocated how the event concept can be used for semantically rich web service description. A distinction is made between two web service interfaces: a non-transactional query interface and a transactional event notification interface. Furthermore, a web service composition model is proposed, based on event broadcasting and event preconditions, instead of traditional one-to-one method invocations. The composition model is presented in a static variant and in a version with dynamic subscription. Throughout the paper, it is shown how the event based approach fits entirely within the current standard SOAP/WSDL/UDDI web services stack.

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Dive into the Wilfried Lemahieu's collaboration.

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Monique Snoeck

Katholieke Universiteit Leuven

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Bart Baesens

Katholieke Universiteit Leuven

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Frank Goethals

Katholieke Universiteit Leuven

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Jacques Vandenbulcke

Katholieke Universiteit Leuven

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Raf Haesen

Katholieke Universiteit Leuven

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Jasmien Lismont

Katholieke Universiteit Leuven

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Cindy Michiels

Katholieke Universiteit Leuven

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Guido Dedene

Katholieke Universiteit Leuven

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Tine Van Calster

Katholieke Universiteit Leuven

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Geert Monsieur

Katholieke Universiteit Leuven

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