In consultative committee for space data systems（CCSDS） file delivery protocol（CFDP） recommendation of reliable transmission,there are no detail transmission procedure and delay calculation of prompted negative ac...In consultative committee for space data systems（CCSDS） file delivery protocol（CFDP） recommendation of reliable transmission,there are no detail transmission procedure and delay calculation of prompted negative acknowledge and asynchronous negative acknowledge models.CFDP is designed to provide data and storage management,story and forward,custody transfer and reliable end-to-end delivery over deep space characterized by huge latency,intermittent link,asymmetric bandwidth and big bit error rate（BER）.Four reliable transmission models are analyzed and an expected file-delivery time is calculated with different trans-mission rates,numbers and sizes of packet data units,BERs and frequencies of external events,etc.By comparison of four CFDP models,the requirement of BER for typical missions in deep space is obtained and rules of choosing CFDP models under different uplink state informations are given,which provides references for protocol models selection,utilization and modification.展开更多
Rehabilitation engineering aims in the upmost degree to restore the lost functions for those persons with physical disability. Biomechanical modeling has been widely used for different purposes in rehabilitation engin...Rehabilitation engineering aims in the upmost degree to restore the lost functions for those persons with physical disability. Biomechanical modeling has been widely used for different purposes in rehabilitation engineering to understand the bio-展开更多
(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential method...(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential methods including depth and shape determination. He has been awarded 5 prizes between 1992 and 2003, including the state prize in Earth sciences, the state prize in advanced technological sciences and the others. (2)Dr. Norman Bleistein Emeritus Professor of Geophysics, Colorado School of Mines, USA. His primary research interests: asymptotic methods for forward modeling and inversion in seismic exploration.He is a Fellow of the Institute of Physics, UK, and Guest Professor, China University of Geosciences, Wuhan, China.展开更多
(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential methods i...(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential methods including depth and shape determination. He has been awarded 5 prizes between 1992 and 2003, including the state prize in Earth sciences, the state prize in advanced technological sciences and the others.展开更多
国际原子能机构(IAEA)目前已经按2008年制定的长期结构(Long Term Structure)自上而下建立了由145项标准组成的安全标准体系,同时计划在2026年制定一个着眼于未来10~15年的新长期结构,以适应人工智能、气候变化、新型反应堆等带来的新...国际原子能机构(IAEA)目前已经按2008年制定的长期结构(Long Term Structure)自上而下建立了由145项标准组成的安全标准体系,同时计划在2026年制定一个着眼于未来10~15年的新长期结构,以适应人工智能、气候变化、新型反应堆等带来的新需求。本文介绍了IAEA辐射安全标准委员会(RASSC)的主要工作,并讨论了RASSC近期关注的辐射安全问题:针对现存照射辨识和管理方面的挑战,RASSC正在新制定一项关于现存照射的综合性安全导则;虽然国际放射防护委员会(ICRP)已经更新了职业人员内照射剂量系数,RASSC不会立即修订与之相关的安全标准,同时会持续关注成员国经验反馈;随着新型放疗技术的应用,RASSC近期还关注放射性核素治疗中的辐射防护、放疗患者的第二原发癌的风险。展开更多
基金supported by the National Natural Science Fandation of China (6067208960772075)
文摘In consultative committee for space data systems（CCSDS） file delivery protocol（CFDP） recommendation of reliable transmission,there are no detail transmission procedure and delay calculation of prompted negative acknowledge and asynchronous negative acknowledge models.CFDP is designed to provide data and storage management,story and forward,custody transfer and reliable end-to-end delivery over deep space characterized by huge latency,intermittent link,asymmetric bandwidth and big bit error rate（BER）.Four reliable transmission models are analyzed and an expected file-delivery time is calculated with different trans-mission rates,numbers and sizes of packet data units,BERs and frequencies of external events,etc.By comparison of four CFDP models,the requirement of BER for typical missions in deep space is obtained and rules of choosing CFDP models under different uplink state informations are given,which provides references for protocol models selection,utilization and modification.
基金Research Grant Council of Hong Kong (GRF Project nos PolyU5331 /07E,PolyU5352 /08E)a grant from Ministry of Sciences and Technology,China (No 2006BAI22B00)
文摘Rehabilitation engineering aims in the upmost degree to restore the lost functions for those persons with physical disability. Biomechanical modeling has been widely used for different purposes in rehabilitation engineering to understand the bio-
文摘(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential methods including depth and shape determination. He has been awarded 5 prizes between 1992 and 2003, including the state prize in Earth sciences, the state prize in advanced technological sciences and the others. (2)Dr. Norman Bleistein Emeritus Professor of Geophysics, Colorado School of Mines, USA. His primary research interests: asymptotic methods for forward modeling and inversion in seismic exploration.He is a Fellow of the Institute of Physics, UK, and Guest Professor, China University of Geosciences, Wuhan, China.
文摘(1)Dr. El-Sayed Mohamed Abdelrahman Professor of Geophysics, Cairo University, Egypt. His primary research interests are potential field methods. His research has focused on gravity, magnetic, self-potential methods including depth and shape determination. He has been awarded 5 prizes between 1992 and 2003, including the state prize in Earth sciences, the state prize in advanced technological sciences and the others.
文摘国际原子能机构(IAEA)目前已经按2008年制定的长期结构(Long Term Structure)自上而下建立了由145项标准组成的安全标准体系,同时计划在2026年制定一个着眼于未来10~15年的新长期结构,以适应人工智能、气候变化、新型反应堆等带来的新需求。本文介绍了IAEA辐射安全标准委员会(RASSC)的主要工作,并讨论了RASSC近期关注的辐射安全问题:针对现存照射辨识和管理方面的挑战,RASSC正在新制定一项关于现存照射的综合性安全导则;虽然国际放射防护委员会(ICRP)已经更新了职业人员内照射剂量系数,RASSC不会立即修订与之相关的安全标准,同时会持续关注成员国经验反馈;随着新型放疗技术的应用,RASSC近期还关注放射性核素治疗中的辐射防护、放疗患者的第二原发癌的风险。
