Location-aware applications have been used widely with the assistance of the latest positioning features in Smart Phone such as GPS,AGPS,etc.However,all the existing applications gather users' geographical data an...Location-aware applications have been used widely with the assistance of the latest positioning features in Smart Phone such as GPS,AGPS,etc.However,all the existing applications gather users' geographical data and transfer them into the pertinent information to give meaning and value.For this kind of solutions,the user's privacy and security issues might be raised because the geographical location has to be exposed to the service provider.A novel and practical solution is proposed in this article to provide the relative location of two mobile users based on their WiFi scanned results without any additional sensors.There is no privacy concern in this solution because end users will not collect and send any sensitive information to the server.This solution adopts a Client/Server(C/S) architecture,where the mobile user as a client reports the ambient WiFi APs and the server calculates the distances based on the WiFi AP's topological relationships.A series of technologies are explored to improve the accuracy of the estimated distance and the corresponding algorithms are proposed.We also prove the feasibility with the prototype of "Circle Your Friends" System(CYFS) on Android phone which lets the mobile user know the distance between him and his social network friends.展开更多
Most of the time, clients only have one opportunity to evaluate a service received in terms of quality and satisfaction; under this premise organizations have been concerned with developing, in a permanent manner, a q...Most of the time, clients only have one opportunity to evaluate a service received in terms of quality and satisfaction; under this premise organizations have been concerned with developing, in a permanent manner, a quality evaluation culture in the services offered to their clients. To do this, procedures and methods that let them achieve it, have been implemented. That is the case of the model that concedes to measure and evaluate service quality, which is redefined and named Servqual, considering a multidimensional theoretical construct that explains the client＇s perception of quality service considering the differences between what is expected and what is received. Therefore, the goal of this study is to identify the factors that define the quality of emergency services provided by a private hospital in Hermosillo, Sonora, Mtxico, a sample of 384 patients, with a confidence level of 95% and a margin of permissible error of 5%. A questionnaire with 22 items was applied to measure the perceptions and expectations of users in terms of the quality of the service, which was subjected to an extensive evaluation of reliability and construct validity, with an estimate Cronbach＇s alpha of 95.6% and 97.9% respectively. The results showed that Servqual is a valid, reliable, and dependable instrument to monitor and measure the quality of the services offered in private hospitals in Hermosillo, and permit hospital administrators to identify opportunities or improvement areas, from the patients＇ perspective.展开更多
Aiming at discovering target customers,this article establishes the value assessment system for government& corporate customers according to the level,stability and accessibility of customer value.With 137 custome...Aiming at discovering target customers,this article establishes the value assessment system for government& corporate customers according to the level,stability and accessibility of customer value.With 137 customers as samples,it builds the government & corporate customer value assessment system through analytic hierarchy process(AHP) and identifies target government &corpora te customers by indicator optimization,model fitting and cluster analysis.All these achievements help accurate identification of high-value government and corporate customers and optimization of resource allocation for customer service.展开更多
With the sharp increase of hacking attacks over the last couple of years, web application security has become a key concern. SQL injection is one of the most common types of web hacking and has been widely written and...With the sharp increase of hacking attacks over the last couple of years, web application security has become a key concern. SQL injection is one of the most common types of web hacking and has been widely written and used in the wild. This paper analyzes the principle of SQL injection attacks on Web sites, presents methods available to prevent IIS ＋ ASP ＋ MSSQL web applications from these kinds of attacks, including secure coding within the web application, proper database configuration, deployment of IIS. The result is verified by WVS report.展开更多
This paper aims to present the configuration design approach and the energy management strategy （EMS） of a series-parallel hybrid electric transit bus （SPHEB） jointly developed by Shanghai Automotive Industry Co. ...This paper aims to present the configuration design approach and the energy management strategy （EMS） of a series-parallel hybrid electric transit bus （SPHEB） jointly developed by Shanghai Automotive Industry Co. Ltd. （SAIC） and Shanghai Jiao Tong University （SJTU）, China. A major feature of this SPHEB is that a novel manual transmission is designed to switch the powertrain configuration between series and parallel types. To reduce the fuel consumption as well as sustain the battery state of charge, an EMS including seven energy flow modes is designed and applied to this SPHEB. Governed by this EMS, the engine is maintained to operate in high efficiency regions. The experimental test carded on the transit bus city driving cycle is described and analyzed. The experimental results demonstrate the technical feasibility and fuel economy of this approach.展开更多
This paper considers a variant of the classical facility location game called the uncapacitared facility location game with penalties （UFLGWP）. Unlike the standard UFLG, each client in the UFLGWP is either assigned ...This paper considers a variant of the classical facility location game called the uncapacitared facility location game with penalties （UFLGWP）. Unlike the standard UFLG, each client in the UFLGWP is either assigned to an open facility or rejected by paying a penalty. The authors propose a 3-approximate cross-monotonic cost-sharing method for the UFLGWP.展开更多
This paper studies the batch sizing scheduling problem with earliness and tardiness penalties which is closely related to a two-level supply chain problem.In the problem,there are K customer orders,where each customer...This paper studies the batch sizing scheduling problem with earliness and tardiness penalties which is closely related to a two-level supply chain problem.In the problem,there are K customer orders,where each customer order consisting of some unit length jobs has a due date.The jobs are processed in a common machine and then delivered to their customers in batches,where the size of each batch has upper and lower bounds and each batch may incur a fixed setup cost which can also be considered a fixed delivery cost.The goal is to find a schedule which minimizes the sum of the earliness and tardiness costs and the setup costs incurred by creating a new batch.The authors first present some structural properties of the optimal schedules for single-order problem with an additional assumption(a):The jobs are consecutively processed from time zero.Based on these properties,the authors give a polynomial-time algorithm for single-order problem with Assumption(a).Then the authors give dynamic programming algorithms for some special cases of multiple-order problem with Assumption(a).At last,the authors present some structural properties of the optimal schedules for single-order problem without Assumption(a) and give a polynomial-time algorithm for it.展开更多
In this paper,a two-stage model is developed to investigate the location strategy andthe commodity pricing strategy for a retail firm that wants to enter a spatial market with multiplecompetitive facilities,where a co...In this paper,a two-stage model is developed to investigate the location strategy andthe commodity pricing strategy for a retail firm that wants to enter a spatial market with multiplecompetitive facilities,where a competitor firm is already operating as a monopoly with several outlets.Expected market shares are calculated based on the stochastic customer behavior on networks.Theauthors provide a sufficient condition for the existence of equilibrium prices in the price game for thefirst time.The existence and uniqueness of the pure strategy Nash equilibrium price with a specifiedutility function are proved in the subgame.A metaheuristic based on tabu search is proposed tosearch the optimal location-price solution of the model.In addition,the authors provide two numericalexamples to illustrate how to obtain the optimal solution and conduct sensitivity analysis.The analysisshows that the best location decision is robust for the follower firm,price game is more intense whenincomes of consumers are lower or there are more substitution products,and neither chain retail gainsfrom the price competition.展开更多
基金supported by HONG KONG RGC and HONG KONG PolyU under the Grant G-U752/PolyU5103/09Ethe National Natural Science Foundation of Chinaunder Grant No.61003040,No.61202354
文摘Location-aware applications have been used widely with the assistance of the latest positioning features in Smart Phone such as GPS,AGPS,etc.However,all the existing applications gather users' geographical data and transfer them into the pertinent information to give meaning and value.For this kind of solutions,the user's privacy and security issues might be raised because the geographical location has to be exposed to the service provider.A novel and practical solution is proposed in this article to provide the relative location of two mobile users based on their WiFi scanned results without any additional sensors.There is no privacy concern in this solution because end users will not collect and send any sensitive information to the server.This solution adopts a Client/Server(C/S) architecture,where the mobile user as a client reports the ambient WiFi APs and the server calculates the distances based on the WiFi AP's topological relationships.A series of technologies are explored to improve the accuracy of the estimated distance and the corresponding algorithms are proposed.We also prove the feasibility with the prototype of "Circle Your Friends" System(CYFS) on Android phone which lets the mobile user know the distance between him and his social network friends.
文摘Most of the time, clients only have one opportunity to evaluate a service received in terms of quality and satisfaction; under this premise organizations have been concerned with developing, in a permanent manner, a quality evaluation culture in the services offered to their clients. To do this, procedures and methods that let them achieve it, have been implemented. That is the case of the model that concedes to measure and evaluate service quality, which is redefined and named Servqual, considering a multidimensional theoretical construct that explains the client＇s perception of quality service considering the differences between what is expected and what is received. Therefore, the goal of this study is to identify the factors that define the quality of emergency services provided by a private hospital in Hermosillo, Sonora, Mtxico, a sample of 384 patients, with a confidence level of 95% and a margin of permissible error of 5%. A questionnaire with 22 items was applied to measure the perceptions and expectations of users in terms of the quality of the service, which was subjected to an extensive evaluation of reliability and construct validity, with an estimate Cronbach＇s alpha of 95.6% and 97.9% respectively. The results showed that Servqual is a valid, reliable, and dependable instrument to monitor and measure the quality of the services offered in private hospitals in Hermosillo, and permit hospital administrators to identify opportunities or improvement areas, from the patients＇ perspective.
基金The work presented in this study is supported by the National Natural Science Foundation of China （Grant No.71372046）. As the authors of this paper, we＇d like to express our sincere gratitude to China enterprise research center, Tsinghua University. Since without the inspiring academic atmosphere, we could hardly come up with the creativity of this study. Besides, we also appreciate the cooperation of our subjects who were all students of our university.
文摘Aiming at discovering target customers,this article establishes the value assessment system for government& corporate customers according to the level,stability and accessibility of customer value.With 137 customers as samples,it builds the government & corporate customer value assessment system through analytic hierarchy process(AHP) and identifies target government &corpora te customers by indicator optimization,model fitting and cluster analysis.All these achievements help accurate identification of high-value government and corporate customers and optimization of resource allocation for customer service.
文摘With the sharp increase of hacking attacks over the last couple of years, web application security has become a key concern. SQL injection is one of the most common types of web hacking and has been widely written and used in the wild. This paper analyzes the principle of SQL injection attacks on Web sites, presents methods available to prevent IIS ＋ ASP ＋ MSSQL web applications from these kinds of attacks, including secure coding within the web application, proper database configuration, deployment of IIS. The result is verified by WVS report.
基金Project (No. 2006AA11A127) supported by the Hi-Tech (863) Research and Development Program of China
文摘This paper aims to present the configuration design approach and the energy management strategy （EMS） of a series-parallel hybrid electric transit bus （SPHEB） jointly developed by Shanghai Automotive Industry Co. Ltd. （SAIC） and Shanghai Jiao Tong University （SJTU）, China. A major feature of this SPHEB is that a novel manual transmission is designed to switch the powertrain configuration between series and parallel types. To reduce the fuel consumption as well as sustain the battery state of charge, an EMS including seven energy flow modes is designed and applied to this SPHEB. Governed by this EMS, the engine is maintained to operate in high efficiency regions. The experimental test carded on the transit bus city driving cycle is described and analyzed. The experimental results demonstrate the technical feasibility and fuel economy of this approach.
基金supported by the National Natural Science Foundation of China under Grant Nos.60773185 and 11071268Program for Beijing Excellent Talents
文摘This paper considers a variant of the classical facility location game called the uncapacitared facility location game with penalties （UFLGWP）. Unlike the standard UFLG, each client in the UFLGWP is either assigned to an open facility or rejected by paying a penalty. The authors propose a 3-approximate cross-monotonic cost-sharing method for the UFLGWP.
基金National Nature Science Foundation of China under Grant Nos.11471210and 11171207the Natural Science Foundation of Ningbo City under Grant No.2015A610168the Natural Science Foundation of Zhejiang Province of China under Grant No.LQl3A010010
文摘This paper studies the batch sizing scheduling problem with earliness and tardiness penalties which is closely related to a two-level supply chain problem.In the problem,there are K customer orders,where each customer order consisting of some unit length jobs has a due date.The jobs are processed in a common machine and then delivered to their customers in batches,where the size of each batch has upper and lower bounds and each batch may incur a fixed setup cost which can also be considered a fixed delivery cost.The goal is to find a schedule which minimizes the sum of the earliness and tardiness costs and the setup costs incurred by creating a new batch.The authors first present some structural properties of the optimal schedules for single-order problem with an additional assumption(a):The jobs are consecutively processed from time zero.Based on these properties,the authors give a polynomial-time algorithm for single-order problem with Assumption(a).Then the authors give dynamic programming algorithms for some special cases of multiple-order problem with Assumption(a).At last,the authors present some structural properties of the optimal schedules for single-order problem without Assumption(a) and give a polynomial-time algorithm for it.
基金supported by the National Natural Science Foundation of China under Grant No. 70801003the Chinese Universities Scientific Fund (ZZ0915)
文摘In this paper,a two-stage model is developed to investigate the location strategy andthe commodity pricing strategy for a retail firm that wants to enter a spatial market with multiplecompetitive facilities,where a competitor firm is already operating as a monopoly with several outlets.Expected market shares are calculated based on the stochastic customer behavior on networks.Theauthors provide a sufficient condition for the existence of equilibrium prices in the price game for thefirst time.The existence and uniqueness of the pure strategy Nash equilibrium price with a specifiedutility function are proved in the subgame.A metaheuristic based on tabu search is proposed tosearch the optimal location-price solution of the model.In addition,the authors provide two numericalexamples to illustrate how to obtain the optimal solution and conduct sensitivity analysis.The analysisshows that the best location decision is robust for the follower firm,price game is more intense whenincomes of consumers are lower or there are more substitution products,and neither chain retail gainsfrom the price competition.
