2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1985 1984 1982 1980 1979 1978 1977 1976 1975
Journals Conferences Reports
Gerven, M.A.J. van and Lucas, P.J.F. and Weide, Th.P. van der, A Generic Qualitative Characterization of Independence of Causal Influence. International Journal of Approximate Reasoning, Vol 48, Nr. 1, 214-136, 2008
Independence of causal influence (ICI) offer a high level starting point for the design of Bayesian networks. However, these models are not as widely applied as they could, as their behavior is often not well-understood. One approach is to employ qualitative probabilistic network theory in order to derive a qualitative characterization of ICI models. In this paper we analyze the qualitative properties of ICI models with binary random variables. Qualitative properties are shown to follow from the characteristics of the Boolean function underlying the model. In addition, it is demonstrated that the theory also allows finding constraints on the model parameters given knowledge of the qualitative properties. This high- level qualitative characterization offers a new way of identifying suitable ICI models and may facilitate their exploitation in developing real-world Bayesian networks.
[ cite ]
Journals Conferences Reports
Kanagwa, B. and Mugisa, E.K. and Weide, Th.P. van der, On Systematic Design of Service-Oriented Architectures. International Conference on Software Engineering Research and Practice (SERP'08), Las Vegas, Nevada, USA, pages 374-381, 2008
We present a systematic means of designing service-oriented systems. Because services are developed independently, with no prior knowledge about each other, there is only a limited possibility that such services use similar message templates, initiate calls to any other service, or generate messages to support desired architecture configurations. As a result, construction of service-oriented systems rely on intermediary services to preprocess, transform and route messages to appropriate locations. The paper suggests a systematic design for the intermediary services and construction of services-oriented systems using a reuse drive approach. The approach is founded on category theory- a formal foundation for capturing and preserving structures. The approach supports parallel and incremental inter-connection of services in a planned and reusable manner.
[ cite ]
Heijden, M. van der and Sprinkhuizen-Kuyper, I.G. and Weide, Th.P. van der, Towards a better understanding of language model information retrieval. In Proceedings of the 2nd BCS IRSG Symposium on Future Directions in Information Access 2008, pages 30-37, 2008
Language models form a class of successful probabilistic models in information retrieval. However, knowledge of why some methods perform better than others in a particular situation remains limited. In this study we analyze what language model factors influence information retrieval performance. Starting from popular smoothing methods we review what data features have been used. Document length and a measure of document word distribution turned out to be the important factors, in addition to a distinction in estimating the probability of seen and unseen words. We propose a class of parameter-free smoothing methods, of which multiple specific instances are possible. Instead of parameter tuning however, an analysis of data features should be used to decide upon a specific method. Finally, we discuss some initial experiments.
[ cite ]
Journals Conferences Reports
Kanagwa, B. and Weide, Th.P. van der, A Predicate Logic Approach for Service Request Satisfaction, Similarity, Reasoning and Construction.
With service owned and managed by entities possibly different from the users, it is important to reason about service invocation, computation, request satisfaction and construction of service-oriented systems. A key problem in service computing is the lack of systematic means to reason about the construction of service-oriented systems. In addition, the effect of the construction on the participnat services is not well defined. In this paper, we present a predicate transformer approach whose aim is the precise characterization of the problem to automatic service composition and construction.
We introduce two views on services, the intensional view and the extensional view that provvide a formal approach for building networks of services called goal services that satisfy a specific request. We study the problem of request decomposition where a request is decomposed into manageable sub-requests that are then mapped onto suitable concrete services. Predicate transformers (functions from ppredicates to predicates) provide a handle to reason about goal service construction. Similarity calculus is also introduced to manage the complecity and computability of predicate conjunctions and disjunctions. Through our derived theorems and transition relations, we are able to construct and reason about networks of services that satisfy a given goal.
Bakker, J. and Rutten, D. and Weide, Th.P. van der, The Search Process as a Path between Information Need Awareness and System Awareness.
In 1968, Taylor studied interaction between patrons and librarians, which led him to introduce .Information Need Awareness. as a measure of a searcher's understanding of his Information Need. In this paper, this concept is used to more explicitly decompose searcher's general behavior, capabilities and expectations during their search process.
In revisiting the 1968 paper, we redefine Information Need Awareness by more formally expressing Taylor's original Information Need Levels through the introduction of a second dimension entitled System Awareness. This allows for a broader application of Information Need Awareness, going beyond Library Science, to the field of Information Retrieval.
By differentiating between the aforementioned Information Need Awareness and System Awareness, this paper gives some insight in the development of a searcher's awareness level throughout the search process. This is made explicit by expressing the searcher.s state in terms of a path between both Information Need Awareness and System Awareness, which is referred to as an Awareness Development Path.
Kanagwa, B. and Mugisa, E.K. and Weide, Th.P. van der, Foundation Theory for Systematic Design of service Oriented Architectures. Under Review