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IPCO
2004
15 years 11 days ago
2004
We study the convex hull of the feasible set of the semi-continuous knapsack problem, in which the variables belong to the union of two intervals. Besides being important in its o...
DGO
2003
15 years 11 days ago
2003
The paper introduces a query tool which allows users (either database experts or non-specialist users) to visually formulate and execute spatial queries directed to large federal ...
IPCO
2004
15 years 11 days ago
2004
In this paper we use facets of simple mixed-integer sets with three variables to derive a parametric family of valid inequalities for general mixed-integer sets. We call these ine...
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DGO
2003
15 years 11 days ago
2003
: We overview three major types of GIS-oriented spatiotemporal databases: (1) point-based, (2) region-based, and (3) constraint-based. We analyze the relationship among these spati...
HCI
2001
15 years 11 days ago
2001
This paper discusses possibilities and problems arising in the design of usable interactive systems when both visual and haptic interaction modes are available. Communicational an...