Matti Heikkurinen

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The state of computer and networking technology today makes the seamless sharing of computing resources on an international or even global scale conceivable. Scientific computing Grids that integrate large, geographically distributed computer clusters and data storage facilities are being developed in several major projects around the world. This article(More)
Several Grid projects have been established that deploy a “first generation Grid”. In order to categorise existing projects in Europe, we have developed a taxonomy and applied it to 20 European Grid projects funded by the European Commission through the Framework 5 IST programme. We briefly describe the projects and thus provide an overview of current Grid(More)
ICT costs have been traditionally assessed using well-established methods such as full cost accounting or total cost of ownership. Within their specific, optimal application areas they provide very good tools for cost follow-up and strategic decision-making. However, as the scale and complexity of the system being analysed grows, these methods become less(More)
Cross-border trade inherently involves coordination of a highly complex community of actors belonging to groups with different priorities. This management complexity is further increased with the addition of ICT, which brings in obvious benefits but also hidden risks and challenges,. Federated 'CT management is a new discipline that has emerged to tackle(More)
Conceptual modelling is needed to form a description of the domain of application at hand. In order to express the result of conceptual modelling, we need a modelling language. First order predicate logic (FOPL) or its variants (like Horn-clauses and Description Logics) and extensions (second order logics) can form a backbone of such a language, but some(More)