Customer requirements analysis is the key step for product variety design of mass customiza-tion(MC). Quality function deployment (QFD) is a widely used management technique for understanding the voice of the customer...Customer requirements analysis is the key step for product variety design of mass customiza-tion(MC). Quality function deployment (QFD) is a widely used management technique for understanding the voice of the customer (VOC), however, QFD depends heavily on human subject judgment during extracting customer requirements and determination of the importance weights of customer requirements. QFD pro-cess and related problems are so complicated that it is not easily used. In this paper, based on a general data structure of product family, generic bill of material (GBOM), association rules analysis was introduced to construct the classification mechanism between customer requirements and product architecture. The new method can map customer requirements to the items of product family architecture respectively, accomplish the mapping process from customer domain to physical domain directly, and decrease mutual process between customer and designer, improve the product design quality, and thus furthest satisfy customer needs. Finally, an example of customer requirements mapping of the elevator cabin was used to illustrate the proposed method.展开更多
Urban smog issue has become more and more heated topic in China in recent years.Vehicle pollution is one of the main reasons for smog and haze in most large and medium-sized cities in the country.Maybe it is not surpr...Urban smog issue has become more and more heated topic in China in recent years.Vehicle pollution is one of the main reasons for smog and haze in most large and medium-sized cities in the country.Maybe it is not surprising now that the nation drives 95 million cars,second only to the United States with 240 million.Therefore,China has released a series of policies to alleviate the increasingly severe urban smog issues and accelerate upgrading of oil products quality.展开更多
Laboratory investigations were carried out to establish conservative estimates of the contaminant removals obtained by the recharge of local secondary effluents through a sand dune. In the preliminary study, suitabili...Laboratory investigations were carried out to establish conservative estimates of the contaminant removals obtained by the recharge of local secondary effluents through a sand dune. In the preliminary study, suitability of unchlorinated wastewater as opposed to the chlorinated wastewater and the development of headlosses were investigated with respect to the development of anaerobic conditions. In the main laboratory study, a 5 m high Plexiglass sand box column was investigated for conservative predictions. The average removals of BOD, COD, and TOC were over 65%, 65%, and 55%, respectively. The COD was primarily removed in the first 200 cm of the column. The effluent had a residual TOC of 1.66 mg/L and consisted of humic substances. The average removal of microbial indicator organisms： Total Coliform （TC） and Coliphage were over 85% and 66%, respectively. The product water contained only nominal amounts of TC （Average - 21.5 MPN/100 ml） and Coliphage （Average - 6 PFU/100 ml）. The porous media largely remained unaffected by the recharge operation. The changes were mainly seen in the upper 26 cm of the column.展开更多
We prove a result on the distribution of the general divisor functions in arithmetic progressions to smooth moduli which exceed the square root of the length.
基金the National Natural Science Founda-tion of China (No. 70471022)the NSFC / Hong KongResearch Grant Council (No. 70418013)
文摘Customer requirements analysis is the key step for product variety design of mass customiza-tion(MC). Quality function deployment (QFD) is a widely used management technique for understanding the voice of the customer (VOC), however, QFD depends heavily on human subject judgment during extracting customer requirements and determination of the importance weights of customer requirements. QFD pro-cess and related problems are so complicated that it is not easily used. In this paper, based on a general data structure of product family, generic bill of material (GBOM), association rules analysis was introduced to construct the classification mechanism between customer requirements and product architecture. The new method can map customer requirements to the items of product family architecture respectively, accomplish the mapping process from customer domain to physical domain directly, and decrease mutual process between customer and designer, improve the product design quality, and thus furthest satisfy customer needs. Finally, an example of customer requirements mapping of the elevator cabin was used to illustrate the proposed method.
文摘Urban smog issue has become more and more heated topic in China in recent years.Vehicle pollution is one of the main reasons for smog and haze in most large and medium-sized cities in the country.Maybe it is not surprising now that the nation drives 95 million cars,second only to the United States with 240 million.Therefore,China has released a series of policies to alleviate the increasingly severe urban smog issues and accelerate upgrading of oil products quality.
文摘Laboratory investigations were carried out to establish conservative estimates of the contaminant removals obtained by the recharge of local secondary effluents through a sand dune. In the preliminary study, suitability of unchlorinated wastewater as opposed to the chlorinated wastewater and the development of headlosses were investigated with respect to the development of anaerobic conditions. In the main laboratory study, a 5 m high Plexiglass sand box column was investigated for conservative predictions. The average removals of BOD, COD, and TOC were over 65%, 65%, and 55%, respectively. The COD was primarily removed in the first 200 cm of the column. The effluent had a residual TOC of 1.66 mg/L and consisted of humic substances. The average removal of microbial indicator organisms： Total Coliform （TC） and Coliphage were over 85% and 66%, respectively. The product water contained only nominal amounts of TC （Average - 21.5 MPN/100 ml） and Coliphage （Average - 6 PFU/100 ml）. The porous media largely remained unaffected by the recharge operation. The changes were mainly seen in the upper 26 cm of the column.
文摘We prove a result on the distribution of the general divisor functions in arithmetic progressions to smooth moduli which exceed the square root of the length.
