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A Waste Collection Arc Vehicle Routing Problem with turn constraints (WCAVRPTC) model is proposed to minimize the length of municipal solid waste (MSW) collection routes, which presents several characteristics derived from traffic regulations: some streets can be traversed crossed in only one direction, and some turns should be forbidden when the common angle is too narrow. The problem is transformed...
Standardization is the basic requirement of chain operation, it relates the chain's development speed and success. Calculation standardization level don't get enough attention. Referring to 6¦Ò quality management theory, using discrete coefficient method and choosing some key factors from customer perspective which influenced performance of the chain as evaluation indexes, the paper established an...
at present, China's urbanization is in a stage of rapid development, resulting in the existing "single-core" urban spatial structure has been unable to meet the requirements of the dense population and various economic and social activities in the cities. Therefore, to alleviate population pressure in urban centers, many new districts have been gradually risen around some big cities, and...
In the 21st century, domestic economic and macroscopic policy have already undergone great changes. The new situation in the future has a certain impact on economic and social development and ask for new requirement to Hunan Province.The rapid economic development in CHANG-ZHU-TAN megalopolis Spur the economic development of Hunan Province. Equipment manufacturing industry is the leading industrial...
A comprehensive evaluation index system was built on the basis of harmonious developments of economy, population, society and ecological environment. Through weighting the involved indexes with hierarchy analysis method, economy and society development of Tianjin, China in 2007 was evaluated by fuzzy comprehensive evaluation. The results showed that the comprehensive development of Tianjin belonged...
Data integrated from multiple sources may contain inconsistencies. A consistent query answer (CQA) in a possibly inconsistent database is an answer which is true in every minimal repair of the database. It is proved that for most constraints and queries CQA is a NP problem based on repairing by tuple deletions, therefore there are little applications based on CQA. Under closed world assumption, only...
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