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With the advent of digital communication technologies, an enormous quantity of 代写留学生论文information can be stored and transferred. But with increasing possibility comes increasing complexity. As indicated byte dissatisfaction often experienced by users of information technology, current systems of accessing, organizing and navigating information are proving insufficient. Visualization, the representation of information on an interactive map, is a strategy to make more efficient use of cognitive resources when processing complex information. The design of map-ping systems which can not only present information but communicate knowledge, however, is lacking a comprehensive theoretical foundation. This would account for the following issues: the nature and structure of information and knowledge, the strengths and limitations of the cognitive and perceptual systems, the social context of knowledge work and visual discourse, the sociology of representation, and the implementation and assessment of interface metaphors. This thesis explores aspects of these key areas and presents a state-of-the-art in visualization strategies which are classified according to three informational meta-structures: complexity (paths), context (relationships), and dynamics (change). Analysis of these systems facilitates the distillation of the following principles for knowledge visualization design: map, optimize, stabilize, adapt, and digitalize.

Acknowledgements
For showing me the importance of having a great vision, Hubertus von Amelunxen.For guiding me to ask the right questions, Pierre Levy. For inspiring me to dig deeper and look higher,Richard Scotti.For sharing in the never-ending adventure of building a new school, my fellow students, faculty and administration at ISNM, 2002-2004.For exposing me to the universe of design and visualization,Gui Bonsiepe.For illustrating how terrific a teacher can be,Frieder NakeFor structural support and sound advice for this thesis, Joachim Hasebrook.For endless discussion and design tutelage,Uli Schmidts.For sharing in the sounds of the thesis room,Gerd Stodiek.For keeping me sane and strong through the thesis process,Birte Gro kopf.For unconditional support and love, Alan, Lin, Andrew and Vanessa Judelman.

Introduction
The proliferation of digital communications technologies has created amassive space for the storage and transfer of information. Connectedthrough global networks, millions of computer users are sharing and dis-tributing information contained in documents and stored in archives. Theaccess and availability of information has exploded in the last decades andwill continue to do so in coming years. The technology is rapidly evolvingin sophistication; becoming faster, smaller, more mobile, https://www.51lunwen.org/liuxuelunwendx/and less expensiveevery year.But with increasing possibility comes increasing complexity; the supportby digital and other material technologies of this complex and dynamicinformation space has not necessarily made more efficient the communi-cation of knowledge. Today’s media technology provides a framework inwhich knowledge can be archived and transmitted, but current systems ofaccessing, organizing and navigating information are proving insufficient.Across personal and professional cultures, people are devoting increasing
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