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The emergence of Web services has led to more interest into Web service composition, which is an active area of research. The formidable problem of efficient and effective composition of existing Web services is the subject of much current attention. The study of workflow model is one of the most important parts and a key layer of Web service composition.(More)
OBJECTIVE To evaluate the efficacy and long-term outcome of the bilaminar cortical tenting grafting technique for reconstruction of vertical and horizontal alveolar ridge defects. MATERIAL AND METHODS A bone block harvested from the lateral aspect of the mandibular ramus was bisected into two cortical laminae, which were then used to reconstruct the(More)
We present a distributed spatial index called CANQTree based on a content-addressable network (CAN) and QuadTree-alike structures. In our system, both spatial objects and their corresponding nodes in a QuadTree are identified by some points and mapped into CAN zones of peers. For a given spatial range query, CAN-QTree can provide O(n<sup>1/2</sup>) search(More)
With more and more applications of spatial data, agreat demand on business rules related to spatial informationemerges. Active rule integrated into spatial database can beused to implement not only integrity constraint but alsovarious business rules. Condition matching for active rule iscritical to the efficiency of rules execution. However the activerule(More)