The numerical prediction of ultimate collision force in ship-bridge collision accident has a great influence on the safety of pier and bridge superstructure. However, ship-bridge collision problem is a complex nonlinear dynamic problem, and the linear empirical formula in the existing domestic and foreign standards cannot reflect the numerical value of collision force. In this paper, based on the data of established finite element model, the influence factors of maximum collision force are analyzed, four factors such as the time at which the maximum collision force occurs in the collision force curve, ship speed, hull quality and a coefficient which is related to the elastic deformation coefficient of the specimen of collision block (hull) and bridge pier are selected as the input of networks. BP and RBF neural network prediction models are established to predict the ultimate collision force of ship bridge collision. Combined with the prediction results, poor prediction accuracy of BP neural network is believed to be due to the over-fitting problem. Therefore GA-BP and PSO-BP algorithms are introduced to optimize the original BP neural network, of which the relative errors are 2.38% and 2.24% respectively and prediction accuracy is higher. The results show that it is feasible to predict the ultimate collision force of ship-bridge collision by using neural networks. Especially for the over-fitting problem of BP prediction model, the prediction accuracy of PSO-BP network after solving the over-fitting problem is convincing. The research in this paper successfully proves that the prediction of ultimate collision force by neural network in ship-bridge collision field is feasible with high precision accuracy, which provides scientific guidance and reference for the engineering safety of piers and other substructures in bridge design and construction.
{"title":"Neural network prediction model for ultimate collision force in ship-bridge collision","authors":"Tianqi Wang","doi":"10.1117/12.2652792","DOIUrl":"https://doi.org/10.1117/12.2652792","url":null,"abstract":"The numerical prediction of ultimate collision force in ship-bridge collision accident has a great influence on the safety of pier and bridge superstructure. However, ship-bridge collision problem is a complex nonlinear dynamic problem, and the linear empirical formula in the existing domestic and foreign standards cannot reflect the numerical value of collision force. In this paper, based on the data of established finite element model, the influence factors of maximum collision force are analyzed, four factors such as the time at which the maximum collision force occurs in the collision force curve, ship speed, hull quality and a coefficient which is related to the elastic deformation coefficient of the specimen of collision block (hull) and bridge pier are selected as the input of networks. BP and RBF neural network prediction models are established to predict the ultimate collision force of ship bridge collision. Combined with the prediction results, poor prediction accuracy of BP neural network is believed to be due to the over-fitting problem. Therefore GA-BP and PSO-BP algorithms are introduced to optimize the original BP neural network, of which the relative errors are 2.38% and 2.24% respectively and prediction accuracy is higher. The results show that it is feasible to predict the ultimate collision force of ship-bridge collision by using neural networks. Especially for the over-fitting problem of BP prediction model, the prediction accuracy of PSO-BP network after solving the over-fitting problem is convincing. The research in this paper successfully proves that the prediction of ultimate collision force by neural network in ship-bridge collision field is feasible with high precision accuracy, which provides scientific guidance and reference for the engineering safety of piers and other substructures in bridge design and construction.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132424391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Changhua Wang, Xiliang Zhang, Xihao Zhu, Hancheng Yu, Shuangjing Ni
With the development of highway information, according to the actual demand of highway electromechanical equipment management, this paper designs a multi-protocol internet of things data acquisition system to realize instant messaging and data sharing of electromechanical equipment. The Kohonen neural network is used to train the adaptive module of the existing input protocol. According to the eigenvalues of the header, the shaping number of the end bytes and the length of a single packet of the protocol, the function of automatically selecting the appropriate protocol is realized. In the later stage, the ability to learn more protocol adaptation independently can be realized by updating the protocol knowledge base on the internet of things platform. The results show that the average processing time of Kohonen network for each protocol data is about 109ms, and the average recognition rate reaches 95.45%. Kohonen network can be applied in traffic engineering field and realize the conversion of various information data of electromechanical equipment with different protocols into unified information data through protocol conversion rules.
{"title":"Data acquisition system of Internet of Things based on Kohonen multi-protocol adaptation","authors":"Changhua Wang, Xiliang Zhang, Xihao Zhu, Hancheng Yu, Shuangjing Ni","doi":"10.1117/12.2652742","DOIUrl":"https://doi.org/10.1117/12.2652742","url":null,"abstract":"With the development of highway information, according to the actual demand of highway electromechanical equipment management, this paper designs a multi-protocol internet of things data acquisition system to realize instant messaging and data sharing of electromechanical equipment. The Kohonen neural network is used to train the adaptive module of the existing input protocol. According to the eigenvalues of the header, the shaping number of the end bytes and the length of a single packet of the protocol, the function of automatically selecting the appropriate protocol is realized. In the later stage, the ability to learn more protocol adaptation independently can be realized by updating the protocol knowledge base on the internet of things platform. The results show that the average processing time of Kohonen network for each protocol data is about 109ms, and the average recognition rate reaches 95.45%. Kohonen network can be applied in traffic engineering field and realize the conversion of various information data of electromechanical equipment with different protocols into unified information data through protocol conversion rules.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117222490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current paper selected 12 indicators from four aspects to establish evaluation indicators of the level of development of green logistics in Guangdong Province. The active weights of those indicators were obtained using the Analytic Hierarchy Process (AHP), which were then objectively empowered by the relevant economic statistics of Guangdong Province from 2010 to 2019 through the Entropy Weight Method (EWM) and combined with the results of the Analytic Hierarchy Process (AHP) to obtain the comprehensive empowerment of the indicators. The primary factors influencing the developments of green logistics in Guangdong Province in the medium- and long-term were explored.
{"title":"The level of developments of green logistics in Guangdong Province","authors":"Fan Zhang, Leili Liu","doi":"10.1117/12.2652737","DOIUrl":"https://doi.org/10.1117/12.2652737","url":null,"abstract":"The current paper selected 12 indicators from four aspects to establish evaluation indicators of the level of development of green logistics in Guangdong Province. The active weights of those indicators were obtained using the Analytic Hierarchy Process (AHP), which were then objectively empowered by the relevant economic statistics of Guangdong Province from 2010 to 2019 through the Entropy Weight Method (EWM) and combined with the results of the Analytic Hierarchy Process (AHP) to obtain the comprehensive empowerment of the indicators. The primary factors influencing the developments of green logistics in Guangdong Province in the medium- and long-term were explored.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131823438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In view of the problem of "high cost and difficulty to enter villages" of rural e-commerce express delivery, considering the characteristics of scattered village distribution and insufficient distribution demand, the paper creatively proposes to take the existing bus operation route of the county as the transportation medium to realize the integration of passengers and goods in the downward transportation of e-commerce express from the county to the towns and villages. Then, the existing bus routes were optimized to achieve the dual objectives of minimizing the total cost of bus downlink transportation and visiting the collection point with the minimum distance, and the basic mathematical model was established. On this basis, the improved ant colony algorithm is used to solve the problem of optimizing the rural e-commerce express downlink bus route, and it can be found that the formation of multiple new routes can reduce the downlink transportation cost of e-commerce express and achieve the goal of accessing all the collection points with the minimum delivery distance.
{"title":"Study on optimization of rural passenger and cargo bus based on ant colony algorithm","authors":"Jiamin Dai, Fengli Zheng, Huaqiong Liu","doi":"10.1117/12.2652724","DOIUrl":"https://doi.org/10.1117/12.2652724","url":null,"abstract":"In view of the problem of \"high cost and difficulty to enter villages\" of rural e-commerce express delivery, considering the characteristics of scattered village distribution and insufficient distribution demand, the paper creatively proposes to take the existing bus operation route of the county as the transportation medium to realize the integration of passengers and goods in the downward transportation of e-commerce express from the county to the towns and villages. Then, the existing bus routes were optimized to achieve the dual objectives of minimizing the total cost of bus downlink transportation and visiting the collection point with the minimum distance, and the basic mathematical model was established. On this basis, the improved ant colony algorithm is used to solve the problem of optimizing the rural e-commerce express downlink bus route, and it can be found that the formation of multiple new routes can reduce the downlink transportation cost of e-commerce express and achieve the goal of accessing all the collection points with the minimum delivery distance.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"12340 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130295867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to meet the needs of railway operations in western China, the development of Chinese New Train Control System (CTCS-N) has been launched. To obtain complete and correct system requirements for CTCS-N early in system development, this paper applies the scenario-based requirements analysis method in software engineering to the requirements analysis of CTCS-N. This method takes the system operation scenario as input, analyzes the behaviors of the scenario based on ontology theory, and extracts the system requirements contained in the scenario based on SWRL (Semantic Web Rule Language) reasoning rules. Furthermore, the timed automata (TA) network model is constructed for requirement verification. Based on the design of the CTCS-N architecture, the above method is used to analyze the requirements based on the train integrity monitoring scenario as an example. The result shows that the method can effectively obtain the system requirements and provides a reference for the requirements development of CTCS-N.
为了适应西部铁路运营的需要，中国新型列控系统(CTCS-N)的开发工作已经启动。为了在系统开发早期获得完整、正确的CTCS-N系统需求，本文将软件工程中基于场景的需求分析方法应用到CTCS-N的需求分析中。该方法以系统运行场景为输入，基于本体理论对场景的行为进行分析，并基于SWRL (Semantic Web Rule Language，语义Web规则语言)推理规则提取场景中包含的系统需求。在此基础上，建立了时间自动机(TA)网络模型进行需求验证。基于CTCS-N体系结构的设计，以列车完整性监控场景为例，采用上述方法进行需求分析。结果表明，该方法可以有效地获取系统需求，为CTCS-N的需求开发提供参考。
{"title":"Scenario-based requirements analysis for Chinese new train control system","authors":"Haotong Xu, Kaicheng Li, Lei Yuan, Qiang Fu","doi":"10.1117/12.2652804","DOIUrl":"https://doi.org/10.1117/12.2652804","url":null,"abstract":"In order to meet the needs of railway operations in western China, the development of Chinese New Train Control System (CTCS-N) has been launched. To obtain complete and correct system requirements for CTCS-N early in system development, this paper applies the scenario-based requirements analysis method in software engineering to the requirements analysis of CTCS-N. This method takes the system operation scenario as input, analyzes the behaviors of the scenario based on ontology theory, and extracts the system requirements contained in the scenario based on SWRL (Semantic Web Rule Language) reasoning rules. Furthermore, the timed automata (TA) network model is constructed for requirement verification. Based on the design of the CTCS-N architecture, the above method is used to analyze the requirements based on the train integrity monitoring scenario as an example. The result shows that the method can effectively obtain the system requirements and provides a reference for the requirements development of CTCS-N.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129351582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As automated container terminals are gradually favored by domestic and foreign ports, some ports blindly invest in the construction of automated container terminals in order to improve their visibility, regardless of their own port conditions and the high cost of constructing automated container terminals, which will place a heavy burden on port operations and is not conducive to the push for terminal automation. Therefore, this paper analyzes the construction experience of Xiamen port, Qingdao port, Shanghai port and Tianjin port. In view of the factors affecting the application of container terminal automation in China, dimension reduction is obtained by principal component analysis. The key factors affecting the application of automated container terminals are analyzed, and the evaluation indexes of investment decision-making stage of automated container terminals are clarified, which can provide reference for domestic ports in the investment decision-making stage of constructing automated container terminals.
{"title":"Construction of evaluation index system for investment decision-making stage of automated container terminal","authors":"Wen Jian, Ming Jin, Peng Cai","doi":"10.1117/12.2652715","DOIUrl":"https://doi.org/10.1117/12.2652715","url":null,"abstract":"As automated container terminals are gradually favored by domestic and foreign ports, some ports blindly invest in the construction of automated container terminals in order to improve their visibility, regardless of their own port conditions and the high cost of constructing automated container terminals, which will place a heavy burden on port operations and is not conducive to the push for terminal automation. Therefore, this paper analyzes the construction experience of Xiamen port, Qingdao port, Shanghai port and Tianjin port. In view of the factors affecting the application of container terminal automation in China, dimension reduction is obtained by principal component analysis. The key factors affecting the application of automated container terminals are analyzed, and the evaluation indexes of investment decision-making stage of automated container terminals are clarified, which can provide reference for domestic ports in the investment decision-making stage of constructing automated container terminals.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128408729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper mainly introduces the platform design process, namely "how to do" process. Platform design should follow the characteristics of the SaaS model software, give full consideration to platform scalable, scalability, performance and so on can be configured, multi-tenant way of implementation, introduces the function of platform architecture, design goal and thought, secondly on overall technical architecture, support technology and function of this platform. Finally, several construction and operation modes and profit modes are considered to meet the sustainable development of the platform. The design of the platform can provide high-quality information software services for small and medium-sized enterprises, and contribute to improving the efficiency and increasing economic income of the logistics industry.
{"title":"Intelligent logistics SaaS platform design","authors":"Xinyi Lu, Xinhong Lv, Huaqiong Liu","doi":"10.1117/12.2652329","DOIUrl":"https://doi.org/10.1117/12.2652329","url":null,"abstract":"This paper mainly introduces the platform design process, namely \"how to do\" process. Platform design should follow the characteristics of the SaaS model software, give full consideration to platform scalable, scalability, performance and so on can be configured, multi-tenant way of implementation, introduces the function of platform architecture, design goal and thought, secondly on overall technical architecture, support technology and function of this platform. Finally, several construction and operation modes and profit modes are considered to meet the sustainable development of the platform. The design of the platform can provide high-quality information software services for small and medium-sized enterprises, and contribute to improving the efficiency and increasing economic income of the logistics industry.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133959957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
With the rapid development of logistics industry, express delivery industry and takeaway industry ushered in new opportunities, and urban end distribution as an important part of logistics distribution will directly affect the efficiency of the whole distribution. In view of the current situation of multi-agent urban distribution service, fragmented distribution resources and low distribution efficiency, this paper applies the joint distribution mode to the urban “express delivery + takeaway” distribution and constructs the urban common distribution information platform. Combined with the characteristics of express delivery business and takeout business, the platform is divided into four modules: user layer, platform logic layer, access layer and database layer. Then, detailed planning and development of each module are carried out. Big data, RFID, GIS geographic services, cloud computing and other technologies are used to build a common urban distribution information platform. Through the construction of urban common distribution information platform, it provides reference for future intelligent logistics management.
{"title":"The construction of urban common distribution information platform under the mode of express delivery + takeaway","authors":"Haoming Ma, Yuyao Zhao, Huaqiong Liu","doi":"10.1117/12.2652699","DOIUrl":"https://doi.org/10.1117/12.2652699","url":null,"abstract":"With the rapid development of logistics industry, express delivery industry and takeaway industry ushered in new opportunities, and urban end distribution as an important part of logistics distribution will directly affect the efficiency of the whole distribution. In view of the current situation of multi-agent urban distribution service, fragmented distribution resources and low distribution efficiency, this paper applies the joint distribution mode to the urban “express delivery + takeaway” distribution and constructs the urban common distribution information platform. Combined with the characteristics of express delivery business and takeout business, the platform is divided into four modules: user layer, platform logic layer, access layer and database layer. Then, detailed planning and development of each module are carried out. Big data, RFID, GIS geographic services, cloud computing and other technologies are used to build a common urban distribution information platform. Through the construction of urban common distribution information platform, it provides reference for future intelligent logistics management.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133175203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In recent years, the four- way shuttle storage system has attracted more and more attention. The study on the efficiency of inbound and outbound storage has become the key to solve the efficiency bottleneck of dense storage. In this paper, by modeling the four- way shuttle storage system, anylogic is used to simulate the inbound and outbound forms of standard elevator with chain machine and new elevator with two- way vehicles, and the efficiency is compared. It is concluded that when the dense storage reaches five floors and above, the efficiency of using the new elevator with two- way vehicles is higher, which provides a solution to solve the problem of storage congestion.
{"title":"Optimization analysis of inbound and outbound efficiency of four-way shuttle storage system","authors":"Zhao Fu, Yuan-yi Xia, Huaqiong Liu","doi":"10.1117/12.2652515","DOIUrl":"https://doi.org/10.1117/12.2652515","url":null,"abstract":"In recent years, the four- way shuttle storage system has attracted more and more attention. The study on the efficiency of inbound and outbound storage has become the key to solve the efficiency bottleneck of dense storage. In this paper, by modeling the four- way shuttle storage system, anylogic is used to simulate the inbound and outbound forms of standard elevator with chain machine and new elevator with two- way vehicles, and the efficiency is compared. It is concluded that when the dense storage reaches five floors and above, the efficiency of using the new elevator with two- way vehicles is higher, which provides a solution to solve the problem of storage congestion.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115031890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Taking the Chongqing via Chishui to Xuyong (Sichuan border) expressway project as an example, this paper focus on predicting trip generation, trip distribution, and trip assignment through a four-step model based on motor vehicle Origin-Destination surveys. The location of the project is rich in tourism resources. The construction of this project will promote the development of surrounding tourism resources and generate a large amount of tourism traffic. So, special consideration is given to the characteristics of tourism traffic in the project. The paper obtains the traffic volumes of the Chongqing via Chishui to Xuyong (Sichuan border) expressway.
{"title":"Practice of the travel forecasting model of CCX-expressway accommodating tourism travel","authors":"Zhou Liang","doi":"10.1117/12.2652609","DOIUrl":"https://doi.org/10.1117/12.2652609","url":null,"abstract":"Taking the Chongqing via Chishui to Xuyong (Sichuan border) expressway project as an example, this paper focus on predicting trip generation, trip distribution, and trip assignment through a four-step model based on motor vehicle Origin-Destination surveys. The location of the project is rich in tourism resources. The construction of this project will promote the development of surrounding tourism resources and generate a large amount of tourism traffic. So, special consideration is given to the characteristics of tourism traffic in the project. The paper obtains the traffic volumes of the Chongqing via Chishui to Xuyong (Sichuan border) expressway.","PeriodicalId":116712,"journal":{"name":"Frontiers of Traffic and Transportation Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133548137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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