IntroductionEvery.year many Chinese scientists,scholars,university teachers,doctors,and other professional go toBritain to do research or continue their education sponsored by various bodies such as the SBFSS(Sino-Bri...IntroductionEvery.year many Chinese scientists,scholars,university teachers,doctors,and other professional go toBritain to do research or continue their education sponsored by various bodies such as the SBFSS(Sino-British Friendship Scholarship Scheme)of the TC(Technical Cooperation)scholarship holders:Most of these people are aged between 30 and 50.They have all passed a screening test called the EPT(theEnglish Proficiency Test)before being nominated as candidates.Most attend one or two sessions of apredeparture training course in one of the three pre-departure training centres in China-Beijing,Shanghai and Chengdu.The purpose of these courses includes improving the candidates’languageskills,preparing them with some study skills for their research/study in Britain,giving them knowledgeand advice about living an studying in Britain,and practice for the IELTS test.Each session of thetraining is 4-5 months long.At the end of the training the candidates are given the IELTS test.Thosewho fail to reach Band 6 have to attend one more session and take the test again.展开更多
Delegated proof-of-stake(DPOS) consensus mechanism is widely adopted in blockchain platforms, but problems exist in its current applications. In order to explore the security risks in the voting attack of the DPOS con...Delegated proof-of-stake(DPOS) consensus mechanism is widely adopted in blockchain platforms, but problems exist in its current applications. In order to explore the security risks in the voting attack of the DPOS consensus mechanism, an extensive game model between nodes was constructed, and it was concluded that the DPOS consensus mechanism relies too much on tokens, and the possibility of node attacks is very high. In order to solve the problems of frequent changes of DPOS consensus mechanism nodes, inactive node voting, excessive reliance on tokens, and malicious nodes, a dynamic, credible, and attack-evading DPOS consensus mechanism was proposed. In addition, the Python simulation results show that the improved Bayesian voting algorithm is effective in calculating node scores.展开更多
文摘IntroductionEvery.year many Chinese scientists,scholars,university teachers,doctors,and other professional go toBritain to do research or continue their education sponsored by various bodies such as the SBFSS(Sino-British Friendship Scholarship Scheme)of the TC(Technical Cooperation)scholarship holders:Most of these people are aged between 30 and 50.They have all passed a screening test called the EPT(theEnglish Proficiency Test)before being nominated as candidates.Most attend one or two sessions of apredeparture training course in one of the three pre-departure training centres in China-Beijing,Shanghai and Chengdu.The purpose of these courses includes improving the candidates’languageskills,preparing them with some study skills for their research/study in Britain,giving them knowledgeand advice about living an studying in Britain,and practice for the IELTS test.Each session of thetraining is 4-5 months long.At the end of the training the candidates are given the IELTS test.Thosewho fail to reach Band 6 have to attend one more session and take the test again.
基金supported by the National Natural Science Foundation of China(71673122,72074117)the Fund of Social Sciences in Jiangsu Province(20WTB007)the Scientific Research Fund of Education Ministry-China Mobile(D203209000115)。
文摘Delegated proof-of-stake(DPOS) consensus mechanism is widely adopted in blockchain platforms, but problems exist in its current applications. In order to explore the security risks in the voting attack of the DPOS consensus mechanism, an extensive game model between nodes was constructed, and it was concluded that the DPOS consensus mechanism relies too much on tokens, and the possibility of node attacks is very high. In order to solve the problems of frequent changes of DPOS consensus mechanism nodes, inactive node voting, excessive reliance on tokens, and malicious nodes, a dynamic, credible, and attack-evading DPOS consensus mechanism was proposed. In addition, the Python simulation results show that the improved Bayesian voting algorithm is effective in calculating node scores.
