To deal with the data mining problem of asymmetry misclassification cost, an innovative churn prediction method is proposed based on existing churn prediction research. This method adjusts the misclassification cost b...To deal with the data mining problem of asymmetry misclassification cost, an innovative churn prediction method is proposed based on existing churn prediction research. This method adjusts the misclassification cost based on the C4. 5 decision tree as a baseline classifier, which can obtain the prediction model with a minimum error rate based on the assumption that all misclassifications have the same cost, to realize cost-sensitive learning. Results from customer data of a certain Chinese telecommunication company and the fact that the churners and the non-churners have different misclassification costs demonstrate that by altering the sampling ratio of churners and non-churners, this cost-sensitive learning method can considerably reduce the total misclassification cost produced by traditional classification methods. This method can also play an important role in promoting core competence of Chinese telecommunication industry.展开更多
[Objetive] To make clear the regional agricultural development level.[Method] To accelerate the process of modern agricultural development of Bohai Rim,the assessment index system of modern agriculture was established...[Objetive] To make clear the regional agricultural development level.[Method] To accelerate the process of modern agricultural development of Bohai Rim,the assessment index system of modern agriculture was established preliminarily and the data of provinces and cities in Bohai Rim was evaluated and analyzed,regarding the comprehensive development level of modern agriculture as general target and the input level of modern agriculture,the output level of modern agriculture,the social development level of countryside and the sustainable development level of agriculture as grading index.[Result] The results showed that Bohai Rim just entered the developmental stage of modern agriculture,with the integrated index of 0.585.Viewed from regional perspective,Beijing topped the others with the index of 0.798,which was followed by 0.694 of Tianjin,0.644 of Shandong,0.606 of Liaoning and Hebei province had the lowest value of 0.595.[Conclusion] Among all cities in this region,none of them reached at the developed level of modern agriculture.There were ten cities,which were mainly located in Shandong Province,were at the primary stage while the most of others were at the preliminary or initial stage.展开更多
Aimed at the problem of expensive costs in mutation testing which has hampered its wide use,a technique of introducing a test case selection into the process of mutation testing is proposed.For each mutant,a fixed num...Aimed at the problem of expensive costs in mutation testing which has hampered its wide use,a technique of introducing a test case selection into the process of mutation testing is proposed.For each mutant,a fixed number of test cases are selected to constrain the maximum allowable executions so as to reduce useless work.Test case selection largely depends on the degree of mutation.The mutation distance is an index describing the semantic difference between the original program and the mutated program.It represents the percentage of effective test cases in a test set,so it can be used to guide the selection of test cases.The bigger the mutation distance is,the easier it is that the mutant will be killed,so the corresponding number of effective test cases for this mutant is greater.Experimental results suggest that the technique can remarkably reduce execution costs without a significant loss of test effectiveness.展开更多
Objective:Caregiver burden is used frequently within the nursing literature.It has not yet been clearly defined as there are different opinions regarding this concept.The purpose of this paper is to provide clarity su...Objective:Caregiver burden is used frequently within the nursing literature.It has not yet been clearly defined as there are different opinions regarding this concept.The purpose of this paper is to provide clarity surrounding the concept caregiver burden.Methods:An electronic search of MEDLINE,CINAHL,Health Source Nursing/Academic Edition and Academic Search Complete(ASC)of EBSCO,China National Knowledge Infrastructure(CNKI)and Google Scholar were searched with a limit of 10 years and published in the English or Chinese language.The paper adopted the framework by Walker and Avant.The attributes,antecedents,consequences and uses of the concept were identified.Results:At total of 33 articles were included.The three attributes of caregiver burden were identified as self-perception,multifaceted strain,and over time.The antecedents included insufficient financial resources,multiple responsibility conflict,lack of social activities.The consequences of caregiver burden resulted in negative change which included decreased care provision,decrease in quality of life,physical and psychological health deterioration.Conclusion:A definition of caregiver burden was developed.Tools to measure caregiver burden were identified.The findings from this analysis can be used in nursing practice,nursing education,research and administration.展开更多
In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and r...In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.展开更多
With the rapid growth of the number and flight time of unmanned aerial vehicles(UAVs),safety accidents caused by UAVs flight risk is increasing gradually.Safe air route planning is an effective means to reduce the ope...With the rapid growth of the number and flight time of unmanned aerial vehicles(UAVs),safety accidents caused by UAVs flight risk is increasing gradually.Safe air route planning is an effective means to reduce the operational risk of UAVs at the strategic level.The optimal air route planning model based on ground risk assessment is presented by considering the safety cost of UAV air route.Through the rasterization of the ground surface under the air route,the safety factor of each grid is defined with the probability of fatality on the ground per flight hour as the quantitative index.The air route safety cost function is constructed based on the safety factor of each grid.Then,the total cost function considering both air route safety and flight distance is established.The expected function of the ant colony algorithm is rebuilt and used as the algorithm to plan the air routes.The effectiveness of the new air route planning model is verified through the logistical distribution scenario on urban airspace.The results indicate that the new air route planning model considering safety factor can greatly improve the overall safety of air route under small increase of the total flight time.展开更多
Culture is the soul of a nation, and also the basis of landscape design, the basis of historical inheritance and innovation. Japanese garden was born out of Chinese garden, but because of the difference of geographica...Culture is the soul of a nation, and also the basis of landscape design, the basis of historical inheritance and innovation. Japanese garden was born out of Chinese garden, but because of the difference of geographical environment and national culture, Japanese gardens combine Chinese culture with local national characteristics, forming a unique garden culture in Japan. Based on the research on Japanese gardens like pond garden, rock garden and tea garden, this study analyzed the cultural connotation in Japanese garden landscape design, made in-depth understanding of Japanese landscape development, explored the value existing in the contemporary garden design of Japanese gardens, with the aim to make use of the excellent experience to the garden landscape design in the future.展开更多
How to teach creative writing at school？ If the procedures inherited from writing workshops have undoubtedly proved efficient as regards text production, it is also clear that in Switzerland, as elsewhere in Europe a...How to teach creative writing at school？ If the procedures inherited from writing workshops have undoubtedly proved efficient as regards text production, it is also clear that in Switzerland, as elsewhere in Europe and in the Anglo-Saxon world, the present use of evaluation grids with their numerous items prevents secondary school pupils from adopting the stance of an author. Why？ Simply because the most innovative and ＂literary＂ texts are always surprising： They are ＂different＂, and could not possibly result from writing guidelines devised only to facilitate a mechanical evaluation itself conceived for the sake of some illusory objectivity... Now, in our postmodern age with its rejection of models, what is more difficult than assessing the quality of creative writing？ In our approach, we suggest restoring confidence in the teacher, an expert reader if any, who, acting as a publisher, dramaturge, or mere aesthete, knows how to take his pupils＇ texts seriously, acknowledge their aesthetic value, and look at apparent clumsiness as a possible promise of innovation. The teaching of creative writing lies both in this specific reception of budding works and in the teacher＇s performative utterances that, then and there, make the pupil a writer.展开更多
文摘To deal with the data mining problem of asymmetry misclassification cost, an innovative churn prediction method is proposed based on existing churn prediction research. This method adjusts the misclassification cost based on the C4. 5 decision tree as a baseline classifier, which can obtain the prediction model with a minimum error rate based on the assumption that all misclassifications have the same cost, to realize cost-sensitive learning. Results from customer data of a certain Chinese telecommunication company and the fact that the churners and the non-churners have different misclassification costs demonstrate that by altering the sampling ratio of churners and non-churners, this cost-sensitive learning method can considerably reduce the total misclassification cost produced by traditional classification methods. This method can also play an important role in promoting core competence of Chinese telecommunication industry.
基金Supported by Non-profit project of "Quantitative Evaluation and Adjusting Technology Research on Agricultural Carbon and Nitrogen Balance of Bohai Rim"(200803036)the non-profit project of the twelfth Five-year Plan--"Monitor and Control Research on Agricultural Resource Greenhouse Gas"(201103039)~~
文摘[Objetive] To make clear the regional agricultural development level.[Method] To accelerate the process of modern agricultural development of Bohai Rim,the assessment index system of modern agriculture was established preliminarily and the data of provinces and cities in Bohai Rim was evaluated and analyzed,regarding the comprehensive development level of modern agriculture as general target and the input level of modern agriculture,the output level of modern agriculture,the social development level of countryside and the sustainable development level of agriculture as grading index.[Result] The results showed that Bohai Rim just entered the developmental stage of modern agriculture,with the integrated index of 0.585.Viewed from regional perspective,Beijing topped the others with the index of 0.798,which was followed by 0.694 of Tianjin,0.644 of Shandong,0.606 of Liaoning and Hebei province had the lowest value of 0.595.[Conclusion] Among all cities in this region,none of them reached at the developed level of modern agriculture.There were ten cities,which were mainly located in Shandong Province,were at the primary stage while the most of others were at the preliminary or initial stage.
基金The National High Technology Research and Development Program of China (863 Program) (No. 2008AA01Z113)the National Natural Science Foundation of China (No. 60773105,60973149)
文摘Aimed at the problem of expensive costs in mutation testing which has hampered its wide use,a technique of introducing a test case selection into the process of mutation testing is proposed.For each mutant,a fixed number of test cases are selected to constrain the maximum allowable executions so as to reduce useless work.Test case selection largely depends on the degree of mutation.The mutation distance is an index describing the semantic difference between the original program and the mutated program.It represents the percentage of effective test cases in a test set,so it can be used to guide the selection of test cases.The bigger the mutation distance is,the easier it is that the mutant will be killed,so the corresponding number of effective test cases for this mutant is greater.Experimental results suggest that the technique can remarkably reduce execution costs without a significant loss of test effectiveness.
基金The authors acknowledge the support of the librarians at the Institute of Technology Tralee,Co.Kerry,Ireland.
文摘Objective:Caregiver burden is used frequently within the nursing literature.It has not yet been clearly defined as there are different opinions regarding this concept.The purpose of this paper is to provide clarity surrounding the concept caregiver burden.Methods:An electronic search of MEDLINE,CINAHL,Health Source Nursing/Academic Edition and Academic Search Complete(ASC)of EBSCO,China National Knowledge Infrastructure(CNKI)and Google Scholar were searched with a limit of 10 years and published in the English or Chinese language.The paper adopted the framework by Walker and Avant.The attributes,antecedents,consequences and uses of the concept were identified.Results:At total of 33 articles were included.The three attributes of caregiver burden were identified as self-perception,multifaceted strain,and over time.The antecedents included insufficient financial resources,multiple responsibility conflict,lack of social activities.The consequences of caregiver burden resulted in negative change which included decreased care provision,decrease in quality of life,physical and psychological health deterioration.Conclusion:A definition of caregiver burden was developed.Tools to measure caregiver burden were identified.The findings from this analysis can be used in nursing practice,nursing education,research and administration.
基金Project(51074051)supported by the National Natural Science Foundation of ChinaProject(N110307001)supported by the Fundamental Research Funds for the Central Universities,China
文摘In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.
基金This work is supported by the Scientific Research Project of Tianjin Education Commission(No.2019KJ128).
文摘With the rapid growth of the number and flight time of unmanned aerial vehicles(UAVs),safety accidents caused by UAVs flight risk is increasing gradually.Safe air route planning is an effective means to reduce the operational risk of UAVs at the strategic level.The optimal air route planning model based on ground risk assessment is presented by considering the safety cost of UAV air route.Through the rasterization of the ground surface under the air route,the safety factor of each grid is defined with the probability of fatality on the ground per flight hour as the quantitative index.The air route safety cost function is constructed based on the safety factor of each grid.Then,the total cost function considering both air route safety and flight distance is established.The expected function of the ant colony algorithm is rebuilt and used as the algorithm to plan the air routes.The effectiveness of the new air route planning model is verified through the logistical distribution scenario on urban airspace.The results indicate that the new air route planning model considering safety factor can greatly improve the overall safety of air route under small increase of the total flight time.
文摘Culture is the soul of a nation, and also the basis of landscape design, the basis of historical inheritance and innovation. Japanese garden was born out of Chinese garden, but because of the difference of geographical environment and national culture, Japanese gardens combine Chinese culture with local national characteristics, forming a unique garden culture in Japan. Based on the research on Japanese gardens like pond garden, rock garden and tea garden, this study analyzed the cultural connotation in Japanese garden landscape design, made in-depth understanding of Japanese landscape development, explored the value existing in the contemporary garden design of Japanese gardens, with the aim to make use of the excellent experience to the garden landscape design in the future.
文摘How to teach creative writing at school？ If the procedures inherited from writing workshops have undoubtedly proved efficient as regards text production, it is also clear that in Switzerland, as elsewhere in Europe and in the Anglo-Saxon world, the present use of evaluation grids with their numerous items prevents secondary school pupils from adopting the stance of an author. Why？ Simply because the most innovative and ＂literary＂ texts are always surprising： They are ＂different＂, and could not possibly result from writing guidelines devised only to facilitate a mechanical evaluation itself conceived for the sake of some illusory objectivity... Now, in our postmodern age with its rejection of models, what is more difficult than assessing the quality of creative writing？ In our approach, we suggest restoring confidence in the teacher, an expert reader if any, who, acting as a publisher, dramaturge, or mere aesthete, knows how to take his pupils＇ texts seriously, acknowledge their aesthetic value, and look at apparent clumsiness as a possible promise of innovation. The teaching of creative writing lies both in this specific reception of budding works and in the teacher＇s performative utterances that, then and there, make the pupil a writer.
