Zhang Xiang-Yu

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This paper introduces the concept and characters of dataspace, and presents a framework for dataspace integration and management system. Based on the framework, this paper further summarizes research works on data model, integration, query, update, storage, index, evolution and systems of dataspace. Challenges and future work on dataspace research are(More)
OBJECTIVE To evaluate the effect of crosslinks on the stability of the spine and pedicle screws. METHODS Compression fracture of the L1 vertebra was produced in 30 fresh thoracic and lumbar vertebrae samples obtained from adult sheep, which were divided into 3 groups (n=10)with lot-drawing method. Four screws were fixed onto the superior and inferior(More)
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