2017年6月8-11日，由中国物理学会静电专业委员会和中国电工学会等离子体及应用专业委员会主办、大连理工大学电气工程学院静电与特种电源研究所承办的第5届东亚等离子体及静电环境应用联合研讨会（The 5th East Asia Joint Symposium o...2017年6月8-11日，由中国物理学会静电专业委员会和中国电工学会等离子体及应用专业委员会主办、大连理工大学电气工程学院静电与特种电源研究所承办的第5届东亚等离子体及静电环境应用联合研讨会（The 5th East Asia Joint Symposium on Plasina and Electrostaties Technologies for Envirorrment Application）在大连理工大学召开。东亚等离子体及静电环境应用联合研讨会是日韩等离子体及静电环境应用联合研讨会的延续会议，即首届以“东亚等离子体及静电环境应用联合研讨会”命名的一届会议。展开更多
In static or quasi-static wireless channel environments, secret key generation(SKG) based on wireless channels is vulnerable to active attacks due to the openness and invariance of public pilot, especially man-inthe-m...In static or quasi-static wireless channel environments, secret key generation(SKG) based on wireless channels is vulnerable to active attacks due to the openness and invariance of public pilot, especially man-inthe-middle(MITM) attacks, where attacker acts as a transparent relay to manipulate channel measurements and derive the generated keys. In order to fight against this attack, a dynamic private pilot is designed, where both private pilot and secret key are derived from the characteristics of wireless channels and private to third party. In static or quasi-static environments, we use singular value decomposition techniques to reconstitute the wireless channels to improve the randomness of the wireless channels. Private pilot can encrypt and authenticate the wireless channels, which can make channel state information intercepted by MITM attacker reduced to zero and the SKG rate close to that without attacks. Results of analysis and simulation show the proposed SKG scheme can withdraw the MITM attacks.展开更多
MD simulation study of several peptides including a polyalanine,a helix(pdb:2I9M),and a leucine zipper were carried out to investigate hydrogen bond energetics using dynamic polarized protein-specific charge(DPPC)to a...MD simulation study of several peptides including a polyalanine,a helix(pdb:2I9M),and a leucine zipper were carried out to investigate hydrogen bond energetics using dynamic polarized protein-specific charge(DPPC)to account for the polarization effect in protein dynamics.Results show that the backbone hydrogen-bond strength is generally correlated with its specific local electrostatic environment,measured by the number of water molecules near the hydrogen bond in the first solvation shell.The correlation coefficient is found to be 0.89,0.78,and 0.80,respectively,for polyalanine,2I9M protein,and leucine zipper.In the polyalanine,the energies of the backbone hydrogen bonds are very similar to each other due to their similar local electrostatic environment.The current study helps demonstrate and support the understanding that hydrogen bonds are stronger in a hydrophobic surrounding than in a hydrophilic one.For comparison,the result from simulation using standard force field shows a much weaker correlation between hydrogen bond energy and local electrostatic environment due to the lack of polarization effect in the force field.展开更多
文摘2017年6月8-11日，由中国物理学会静电专业委员会和中国电工学会等离子体及应用专业委员会主办、大连理工大学电气工程学院静电与特种电源研究所承办的第5届东亚等离子体及静电环境应用联合研讨会（The 5th East Asia Joint Symposium on Plasina and Electrostaties Technologies for Envirorrment Application）在大连理工大学召开。东亚等离子体及静电环境应用联合研讨会是日韩等离子体及静电环境应用联合研讨会的延续会议，即首届以“东亚等离子体及静电环境应用联合研讨会”命名的一届会议。
基金supported in part by National Natural Science Foundation of China under Grants No.61601514, 61401510, 61379006Project funded by China Postdoctoral Science Foundation: 2016M592990
文摘In static or quasi-static wireless channel environments, secret key generation(SKG) based on wireless channels is vulnerable to active attacks due to the openness and invariance of public pilot, especially man-inthe-middle(MITM) attacks, where attacker acts as a transparent relay to manipulate channel measurements and derive the generated keys. In order to fight against this attack, a dynamic private pilot is designed, where both private pilot and secret key are derived from the characteristics of wireless channels and private to third party. In static or quasi-static environments, we use singular value decomposition techniques to reconstitute the wireless channels to improve the randomness of the wireless channels. Private pilot can encrypt and authenticate the wireless channels, which can make channel state information intercepted by MITM attacker reduced to zero and the SKG rate close to that without attacks. Results of analysis and simulation show the proposed SKG scheme can withdraw the MITM attacks.
基金supported by the National Natural Science Foundation of China(11147026,31200545,21003048,21173082,11274206,21390411,21433004)the National Basic Research Program of China(2013CB933800)the Supercomputer Center of East China Normal University for CPU time support
文摘MD simulation study of several peptides including a polyalanine,a helix(pdb:2I9M),and a leucine zipper were carried out to investigate hydrogen bond energetics using dynamic polarized protein-specific charge(DPPC)to account for the polarization effect in protein dynamics.Results show that the backbone hydrogen-bond strength is generally correlated with its specific local electrostatic environment,measured by the number of water molecules near the hydrogen bond in the first solvation shell.The correlation coefficient is found to be 0.89,0.78,and 0.80,respectively,for polyalanine,2I9M protein,and leucine zipper.In the polyalanine,the energies of the backbone hydrogen bonds are very similar to each other due to their similar local electrostatic environment.The current study helps demonstrate and support the understanding that hydrogen bonds are stronger in a hydrophobic surrounding than in a hydrophilic one.For comparison,the result from simulation using standard force field shows a much weaker correlation between hydrogen bond energy and local electrostatic environment due to the lack of polarization effect in the force field.
