Keung-Chi Ng

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A criticism of diagnostic systems, which are based on the formal foundations of probability and utility, is that their reasoning strategies and recommendations are inflexible and unnatural. We have developed a facility that increases the flexibility of normative reasoning systems by providing multiple human-oriented perspectives on diagnostic problem(More)
Although traffic between Web servers and Web browsers is readily apparent to many knowledgeable end users, fewer are aware of the extent of server-to-server Web traffic carried over the public Internet. We refer to the former class of traffic as front-office Internet Web traffic and the latter as back-office Internet Web traffic (or just front-office and(More)
Certain class es of problems, including per­ ceptual data understanding, robotics, discov­ ery, and learning, can be represented as incre­ mental, dynamically constructed belief net­ works. These automatically constructed net­ works can be dynamically extended and mod­ ified as evidence of new individuals becomes available. The main result of this paper is(More)
While the performance characteristics of access networks and end-user-to-server paths are well-studied, measuring the performance of the Internet's <i>core</i> remains, largely, an uncharted territory. With more content being moved closer to the end-user, server-to-server paths have increased in length and have a significant role in dictating the quality of(More)
Most existing expert systems contain a single rule base. Any extension of this model to group decision-making must account for the possibility of conflicting rules encoded by different group members. The inability to reconcile conflicts, however, is one of the most clearly established shortcomings of rule-based knowledge representations [4] [11]. Thus,(More)