Search

On behalf of the Organizing Committee, we would like to welcome you to theproccedings of the 23rd International Conference on Conceptual Modeling (ER2004). This conference provided an international forum for technical discussionon conceptual modeling of information systems among researchers, developersand users. This was the third time that this conference was held in Asia; thefirst time was in Singapore in 1998 and the second time was in Yokohama,Japan in 2001. China is the third largest nation with the largest population inthe world. Shanghai, the largest city in China and a great metropolis, famous inAsia and throughout the world, is therefore a most appropriate location to hostthis conference.This volume contains papers selected for presentation and includes the twokeynote talks by Prof. Hector Garcia-Molina and Prof. Gerhard Weikum, andan invited talk by Dr. Xiao Ji.This volume also contains industrial papers and demo/poster papers. Anadditional volume contains papers from 6 workshops.The conference also featured three tutorials: (1) Web Change Managementand Delta Mining: Opportunities and Solutions, by Sanjay Madria, (2) A Surveyof Data Quality Issues in Cooperative Information Systems, by Carlo Batini,and (3) Visual SQL – An ER-Based Introduction to Database Programming, byBernhard Thalheim.The technical program of the conference was selected by a distinguishedprogram committee consisting of three PC Co-chairs, Hongjun Lu, Wesley Chu,and Paolo Atzeni, and more than 70 members. They faced a difficult task inselecting 57 papers from many very good contributions. This year the number ofsubmissions, 293, was a record high for ER conferences. We wish to express ourthanks to the program committee members, external reviewers, and all authorsfor submitting their papers to this conference.

In this paper, we present a visual representation of access control permissions in a standard hierarchical file system. Our visualization of file permissions leverages treemaps, a popular graphical representation of hierarchical data. In particular, we present a visualization of access control for the NTFS file system that can help a non-expert user understand and manipulate file system permissions in a simple and effective way. While our examples are based on NTFS, our approach can be used for many other hierarchical file systems as well.