In this paper we propose two quantum secure direct communication (QSDC) protocols with authentication.The authentication key expansion method is introduced to improve the life of the keys with security.In the first sc...In this paper we propose two quantum secure direct communication (QSDC) protocols with authentication.The authentication key expansion method is introduced to improve the life of the keys with security.In the first scheme,the third party, called Trent is introduced to authenticate the users that participate in the communication.He sends thepolarized photons in blocks to authenticate communication parties Alice and Bob using the authentication keys.In thecommunication process, polarized single photons are used to serve as the carriers, which transmit the secret messagesdirectly.The second QSDC process with authentication between two parties is also discussed.展开更多
objective： to study the problem oriented （PBL） teaching method application in surgery theory teaching effect. Methods： according to the student id number of single and double the surgical theory study stage of the...objective： to study the problem oriented （PBL） teaching method application in surgery theory teaching effect. Methods： according to the student id number of single and double the surgical theory study stage of the 160 cases of medical students divided into two groups, the number into the control group （80 cases）, double number into the experimental group （80 cases）, traditional teaching method and PBL teaching method, respectively with the method of questionnaire survey to evaluate the two teaching methods. Results： after the introduction of PBL method in the experimental teaching, the students＇ classroom situation, knowledge situation, learning efficiency index score significantly higher than the control group, and the ability training all indicators were significantly higher than that of control group （P 〈 0.05）. Conclusion： the introduction of PBL in surgery theory teaching method, the feasibility of high, can provide a good decision for surgical theory teaching.展开更多
基金Supported by the National Fundamental Research Program under Grant No.2010CB923202Specialized Research Fund for the Doctoral Program of Education Ministry of China under Grant No.20090005120008+1 种基金 the Fundamental Research Funds for the Central Universities under Grant No.BUPT2009RC0710 China National Natural Science Foundation under Grant Nos.60871082,60937003 and 10947151
文摘In this paper we propose two quantum secure direct communication (QSDC) protocols with authentication.The authentication key expansion method is introduced to improve the life of the keys with security.In the first scheme,the third party, called Trent is introduced to authenticate the users that participate in the communication.He sends thepolarized photons in blocks to authenticate communication parties Alice and Bob using the authentication keys.In thecommunication process, polarized single photons are used to serve as the carriers, which transmit the secret messagesdirectly.The second QSDC process with authentication between two parties is also discussed.
文摘objective： to study the problem oriented （PBL） teaching method application in surgery theory teaching effect. Methods： according to the student id number of single and double the surgical theory study stage of the 160 cases of medical students divided into two groups, the number into the control group （80 cases）, double number into the experimental group （80 cases）, traditional teaching method and PBL teaching method, respectively with the method of questionnaire survey to evaluate the two teaching methods. Results： after the introduction of PBL method in the experimental teaching, the students＇ classroom situation, knowledge situation, learning efficiency index score significantly higher than the control group, and the ability training all indicators were significantly higher than that of control group （P 〈 0.05）. Conclusion： the introduction of PBL in surgery theory teaching method, the feasibility of high, can provide a good decision for surgical theory teaching.
