Michael Christoffel

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One main idea when developing user interfaces for digital and hybrid libraries is to make use of real-world metaphors. This gives library customers the advantage to access digital collections the same way as they would traditional collections. However, while existing “real world” library interfaces still miss the attraction of the wider public, game(More)
In the modern society, information has become an important resource. While the overall amount of offered information is steadily growing as more and more sources are available through the Internet world-wide, accessing, valuing, and processing information continue to be a hard work. Integration architectures offer a solution for this problem and provide a(More)
This contribution argues that electronic markets can serve as a powerful mechanism to entice providers to identify their customer base and to offer customer-oriented, high-quality and economical services and to induce customers to a more focused and price-conscious behavior. The paper claims that this should be particularly true for the provision and access(More)
The success of the Internet as a medium for the supply and commerce of various kinds of goods and services leads to a fast growing number of autonomous and heterogeneous providers that offer and sell goods and services electronically. The new market structures have already entered all kinds of markets. Approaches for market infrastructures usually try to(More)
The success of the Internet has brought a large quantity of providers offering search and delivery services for scientific literature. We observe the development of an information market, where the value of a piece of information is determined by the law of supply and demand. This situation raises questions as to the future of university libraries. The(More)
The WWW offers an increasing number of services for searching and acquiring scientific literature. New kinds of information providers are available online, traditional libraries follow and offer their services via the WWW. However, this development will not come without a price: Literature supply is changing into an open and competitive information market(More)
Providing and accessing scientific information will increasingly follow a strict market regimen. Needed is a system architecture that supports an information market that is open, heterogeneous and dynamic. The objective of the paper is to find answers to the design of novel intermediaries that serve two purposes: to make the market truly open by easing the(More)
The success of the Internet has caused a significant change in the way of literature supply. Not only traditional libraries, booksellers and publishing houses have begun to enter the new digital world and offer their services world-wide, completely new information providers have been developed such as digital libraries, delivery services, citation services,(More)