Chinese Postman Problem is an unsettled graphic problem. It was approached seldom by evolutionary computation. Now we use genetic algorithm to solve Chinese Postman Problem in undirected graph and get good results. It...Chinese Postman Problem is an unsettled graphic problem. It was approached seldom by evolutionary computation. Now we use genetic algorithm to solve Chinese Postman Problem in undirected graph and get good results. It could be extended to solve Chinese postman problem in directed graph. We make these efforts for exploring in optimizing the mixed Chinese postman problem.展开更多
Under over 50 years' development, Chinese rare earth magnetic industry developed into the global AINiCo, ferrite permanent magnets and NdFeB magnets manufacturing center, and average consumption of magnets per per...Under over 50 years' development, Chinese rare earth magnetic industry developed into the global AINiCo, ferrite permanent magnets and NdFeB magnets manufacturing center, and average consumption of magnets per person in China increased to 1.026 tons in 2003 from 0.217 ton in 1990. Although China has been the large producing country of rare earth permanent magnetic materials, to be the strongest one, there are many problems to solve. Main Problems Faced By Chinese Permanent Magnet展开更多
As a trans-disciplinary research subject jointly explored by different academic divisions of the CAS in an R&D program at the turn of two centuries, the origin of the Chinese nation contains some controversial and...As a trans-disciplinary research subject jointly explored by different academic divisions of the CAS in an R&D program at the turn of two centuries, the origin of the Chinese nation contains some controversial and antagonistic problems of theoretical importance in biology. This article gives its author’s viewpoints on the controversy’s significance and related theoretical problems.展开更多
As the first attempt,this paper proposes a model for the Chinese high school timetabling problems(CHSTPs)under the new curriculum innovation which was launched in 2011 by the Chine6e government.Aooording 10 the new ou...As the first attempt,this paper proposes a model for the Chinese high school timetabling problems(CHSTPs)under the new curriculum innovation which was launched in 2011 by the Chine6e government.Aooording 10 the new our riculum innovation,students in high school can choose subjects that they are interested in instead of being forced to select one of the two study directions,namely,Science and Liberal Arts.Meanwhile,they also need to attend compulsory subjects as traditions.CHSTPs are student-oriented and involve more student constraints that make them more complex than the typi-cal"Class-Teacher model",in which the element"Teacher"is the primary constraint.In this paper,we first describe in detail the mathematical model of CHSTPs and then design a new two-part representation for the candidate solution.Based on the new representation,we adopt a two-phase simulated annealing(SA)algorithm to solve CHSTPs.A total number of 45 synthetic instances with different amounts of classes,teachers,and levels of student constraints are generated and used to ilustrate the characteristics of the CHSTP model and the effectiveness of the designed representation and algorithm.Finally,we apply the proposed model,the designed two-part representation and the two-phase SA on10 real high schools.展开更多
The concentration of Industries In cities is a commonphenomenon In the course of urhanlzatlon.The reason isIballhe concenlralbn orsndustrles wsuob重alnlhe‘乞concen-traied conomlc returns.” The concentration ofindust...The concentration of Industries In cities is a commonphenomenon In the course of urhanlzatlon.The reason isIballhe concenlralbn orsndustrles wsuob重alnlhe‘乞concen-traied conomlc returns.” The concentration ofindustriesincities has occupied more land for indutrial use ifthe industri-al land use makes up a very low proportion in the total landuse In cities,the concentrated e门Dciency can not be broughtinto play.Ifthe Proportion is too big,land for other func-nons will be squeezed out,thus affecting the full play of theoverall functions of＊theons urban land.The unreasonable indus-trial land used now exists in Chinese cities.展开更多
In China,more and more people are learning English.In order to learn and teach effectively,bothstudents and teachers need a suitable coursebook to follow,because it is very difficult for most teachersto tcach systemat...In China,more and more people are learning English.In order to learn and teach effectively,bothstudents and teachers need a suitable coursebook to follow,because it is very difficult for most teachersto tcach systematically without a coursebook As Grant suggests:‘Like a map for a traveller inunknown territory,a coursebook is a reassurance for most students.It offers a systematic revision ofwhat they have done,and a guide to what they are going to do.’(Grant,1987:8)However,manycoursebooks have a lot of problems.This article aims to outline some of the main problems mystudents have faced in using College English at their coursebook and the techniques and activities wehave chosen to overcome these problems.展开更多
基金Supported by the National Natural Science Foundation of China(60133010,70071042)
文摘Chinese Postman Problem is an unsettled graphic problem. It was approached seldom by evolutionary computation. Now we use genetic algorithm to solve Chinese Postman Problem in undirected graph and get good results. It could be extended to solve Chinese postman problem in directed graph. We make these efforts for exploring in optimizing the mixed Chinese postman problem.
文摘Under over 50 years' development, Chinese rare earth magnetic industry developed into the global AINiCo, ferrite permanent magnets and NdFeB magnets manufacturing center, and average consumption of magnets per person in China increased to 1.026 tons in 2003 from 0.217 ton in 1990. Although China has been the large producing country of rare earth permanent magnetic materials, to be the strongest one, there are many problems to solve. Main Problems Faced By Chinese Permanent Magnet
文摘As a trans-disciplinary research subject jointly explored by different academic divisions of the CAS in an R&D program at the turn of two centuries, the origin of the Chinese nation contains some controversial and antagonistic problems of theoretical importance in biology. This article gives its author’s viewpoints on the controversy’s significance and related theoretical problems.
基金This work was supported in part by the Outstanding Young Scholar Program of National Natural Science Foundation of China(NSFC)(Grant No.61522311)in part by the General Program of NSFC(Grant No.61773300)+1 种基金in part by the Key Program of Fundamental Research Project of Natural Science of Shaanxi Province,China(2017JZ017)in part by the Doctoral Students'Short-Term Study Abroad Scholarship Fund of Xidian University.
文摘As the first attempt,this paper proposes a model for the Chinese high school timetabling problems(CHSTPs)under the new curriculum innovation which was launched in 2011 by the Chine6e government.Aooording 10 the new our riculum innovation,students in high school can choose subjects that they are interested in instead of being forced to select one of the two study directions,namely,Science and Liberal Arts.Meanwhile,they also need to attend compulsory subjects as traditions.CHSTPs are student-oriented and involve more student constraints that make them more complex than the typi-cal"Class-Teacher model",in which the element"Teacher"is the primary constraint.In this paper,we first describe in detail the mathematical model of CHSTPs and then design a new two-part representation for the candidate solution.Based on the new representation,we adopt a two-phase simulated annealing(SA)algorithm to solve CHSTPs.A total number of 45 synthetic instances with different amounts of classes,teachers,and levels of student constraints are generated and used to ilustrate the characteristics of the CHSTP model and the effectiveness of the designed representation and algorithm.Finally,we apply the proposed model,the designed two-part representation and the two-phase SA on10 real high schools.
文摘The concentration of Industries In cities is a commonphenomenon In the course of urhanlzatlon.The reason isIballhe concenlralbn orsndustrles wsuob重alnlhe‘乞concen-traied conomlc returns.” The concentration ofindustriesincities has occupied more land for indutrial use ifthe industri-al land use makes up a very low proportion in the total landuse In cities,the concentrated e门Dciency can not be broughtinto play.Ifthe Proportion is too big,land for other func-nons will be squeezed out,thus affecting the full play of theoverall functions of＊theons urban land.The unreasonable indus-trial land used now exists in Chinese cities.
文摘In China,more and more people are learning English.In order to learn and teach effectively,bothstudents and teachers need a suitable coursebook to follow,because it is very difficult for most teachersto tcach systematically without a coursebook As Grant suggests:‘Like a map for a traveller inunknown territory,a coursebook is a reassurance for most students.It offers a systematic revision ofwhat they have done,and a guide to what they are going to do.’(Grant,1987:8)However,manycoursebooks have a lot of problems.This article aims to outline some of the main problems mystudents have faced in using College English at their coursebook and the techniques and activities wehave chosen to overcome these problems.
