main_problems_of_the_research

1.Query optimization is the main problem of query processing research, thus in particular discusses cost estimated, query plan, search Spaces and so on related problems.
查询优化是查询处理研究的一个主要问题，为此着重分析研究了查询优化所涉及的代价估计、查询规划和搜索空间等相关问题。
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2.This paper makes a brief summary of the main models and research framework of supply chain game theory and discusses the concerned problems deserving further studies.
文章对供应链博弈的主要模型及研究进展作了简要综述，并提出一些值得继续探讨的问题。
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3.The main character of this paper is the combination between theory and practice to solve the practice problems by using transport theory, operation research.
本论文以理论联系实际为主要特点，运用运输理论、运筹学、计量经济学的原理和方法来解决实际问题。
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