Evacuated tube transportation （ETT） will be one of the ultra-large-scale vacuum application areas. This paper lists some key vacuum technology issues in ETT： （1） how to construct ultra-large-scale vacuum chamber ...Evacuated tube transportation （ETT） will be one of the ultra-large-scale vacuum application areas. This paper lists some key vacuum technology issues in ETT： （1） how to construct ultra-large-scale vacuum chamber with lower cost and high reliability, （2） how to evacuate gas out of the ETT tube in short time, （3） how to release heat or reduce temperature in the vacuum tube, （4） how to avoid vacuum discharge, （5） how to make vehicles with airproof shells and life support system, and （6） how to detect leaks and find leak positions efficiently. At the same time, some solutions are proposed.展开更多
Data storage security has become the core of many network security issues.In order to achieve trusted storage and trusted measurement of network community data,this paper proposes a secure storage model based on trust...Data storage security has become the core of many network security issues.In order to achieve trusted storage and trusted measurement of network community data,this paper proposes a secure storage model based on trust extension for existing trusted storage technologies.In the process of document encryption,the key information is encrypted as well as decentralized stored by optimizing the ciphertext inverted index structure and update policy to ensure the security of index information.In the process of user access control mechanism,SAML and XACML are used in combination with role-based access control in order to achieve flexible and efficient authorization and access control.In the process of result query,ontology technology is introduced to better express the user’s query intention and improve the query accuracy.A large number of experiments demonstrate the effectiveness and feasibility of the scheme.展开更多
1 Introduction and main contribution Social e-commerce is a new form of modern e-commerce.It relies on information to exchange goods or services.Con-sumers create,disseminate and receive information to search for prod...1 Introduction and main contribution Social e-commerce is a new form of modern e-commerce.It relies on information to exchange goods or services.Con-sumers create,disseminate and receive information to search for products,get recommendations,and interact with other consumers[1].The key challenge in analyzing purchasing behavior on social e-commerce is to understand the law of information dissemination among consumers.Nevertheless,there are few studies on social e-commerce.展开更多
基金provided by National Natural Science Foundation of China (No.50678152)Scientific Plan Fund of Shaanxi Province (No.2009K09-24)
文摘Evacuated tube transportation （ETT） will be one of the ultra-large-scale vacuum application areas. This paper lists some key vacuum technology issues in ETT： （1） how to construct ultra-large-scale vacuum chamber with lower cost and high reliability, （2） how to evacuate gas out of the ETT tube in short time, （3） how to release heat or reduce temperature in the vacuum tube, （4） how to avoid vacuum discharge, （5） how to make vehicles with airproof shells and life support system, and （6） how to detect leaks and find leak positions efficiently. At the same time, some solutions are proposed.
基金supported by the Science and Technology Project of State Grid Corporation of China(No.5700-202258188A-1-1-ZN).
文摘Data storage security has become the core of many network security issues.In order to achieve trusted storage and trusted measurement of network community data,this paper proposes a secure storage model based on trust extension for existing trusted storage technologies.In the process of document encryption,the key information is encrypted as well as decentralized stored by optimizing the ciphertext inverted index structure and update policy to ensure the security of index information.In the process of user access control mechanism,SAML and XACML are used in combination with role-based access control in order to achieve flexible and efficient authorization and access control.In the process of result query,ontology technology is introduced to better express the user’s query intention and improve the query accuracy.A large number of experiments demonstrate the effectiveness and feasibility of the scheme.
基金National Natural Science Foundation of China(Grant No.81373973,81573872,81873228)Science and Technology Planning Project of Guangdong Province(Grant No.2017KZDXM018).
基金supported by the National Natu-ral Science Foundation of China(Grant Nos.U1836206,91646120,and 61572469)supported by Beiing Social Science Foundation(17GLC066).
文摘1 Introduction and main contribution Social e-commerce is a new form of modern e-commerce.It relies on information to exchange goods or services.Con-sumers create,disseminate and receive information to search for products,get recommendations,and interact with other consumers[1].The key challenge in analyzing purchasing behavior on social e-commerce is to understand the law of information dissemination among consumers.Nevertheless,there are few studies on social e-commerce.
