In this paper,we explore a cooperative decode-and-forward(DF)relay network comprised of a source,a relay,and a destination in the presence of an eavesdropper.To improve physical-layer security of the relay system,we p...In this paper,we explore a cooperative decode-and-forward(DF)relay network comprised of a source,a relay,and a destination in the presence of an eavesdropper.To improve physical-layer security of the relay system,we propose a jamming aided decodeand-forward relay(JDFR)scheme combining the use of artificial noise and DF relaying which requires two stages to transmit a packet.Specifically,in stage one,the source sends confidential message to the relay while the destination acts as a friendly jammer and transmits artificial noise to confound the eavesdropper.In stage two,the relay forwards its re-encoded message to the destination while the source emits artificial noise to confuse the eavesdropper.In addition,we analyze the security-reliability tradeoff(SRT)performance of the proposed JDFR scheme,where security and reliability are evaluated by deriving intercept probability(IP)and outage probability(OP),respectively.For the purpose of comparison,SRT of the traditional decode-and-forward relay(TDFR)scheme is also analyzed.Numerical results show that the SRT performance of the proposed JDFR scheme is better than that of the TDFR scheme.Also,it is shown that for the JDFR scheme,a better SRT performance can be obtained by the optimal power allocation(OPA)between the friendly jammer and user.展开更多
目的:观察留置头皮针下作业治疗对脑卒中后认知障碍的疗效。方法:研究对象为2017年4月—2019年12月入组的60例脑卒中后认知障碍患者,随机分入研究组和对照组,每组各30例。研究组接受留置头皮针下作业治疗,对照组仅接受作业治疗,均连续治...目的:观察留置头皮针下作业治疗对脑卒中后认知障碍的疗效。方法:研究对象为2017年4月—2019年12月入组的60例脑卒中后认知障碍患者,随机分入研究组和对照组,每组各30例。研究组接受留置头皮针下作业治疗,对照组仅接受作业治疗,均连续治疗4周。使用蒙特利尔认知评估量表(Montreal Cognitive Assessment,MoCA)福州版、简易精神状态检查表(Mini-mental State Examination,MMSE)和改良Barthel指数评价康复治疗前后的认知功能和日常生活活动能力。结果:除对照组康复治疗前后的记忆及延迟回忆能力评分无显著变化以外,2组康复治疗后的MoCA福州版总评分以及其他单项评分均较康复治疗前显著提高(P<0.05)。康复治疗后,研究组的MoCA福州版总评分、视空间与执行功能、定向力、注意、记忆及延迟回忆能力和计算评分均显著高于对照组(P<0.05)。2组康复治疗后的改良Barthel指数和MMSE评分均较康复治疗前显著提高(P<0.05),并且研究组的改良Barthel指数和MMSE评分的改善程度均优于对照组(P<0.05)。结论:留置头皮针下作业治疗能够提高脑卒中后认知障碍患者的认知功能,改善其日常生活活动能力。展开更多
基金supported in part by the National Natural Science Foundation of China under Grant 62271268,Grant 62071253,and Grant 62371252in part by the Jiangsu Provincial Key Research and Development Program under Grant BE2022800in part by the Jiangsu Provincial 333 Talent Project。
文摘In this paper,we explore a cooperative decode-and-forward(DF)relay network comprised of a source,a relay,and a destination in the presence of an eavesdropper.To improve physical-layer security of the relay system,we propose a jamming aided decodeand-forward relay(JDFR)scheme combining the use of artificial noise and DF relaying which requires two stages to transmit a packet.Specifically,in stage one,the source sends confidential message to the relay while the destination acts as a friendly jammer and transmits artificial noise to confound the eavesdropper.In stage two,the relay forwards its re-encoded message to the destination while the source emits artificial noise to confuse the eavesdropper.In addition,we analyze the security-reliability tradeoff(SRT)performance of the proposed JDFR scheme,where security and reliability are evaluated by deriving intercept probability(IP)and outage probability(OP),respectively.For the purpose of comparison,SRT of the traditional decode-and-forward relay(TDFR)scheme is also analyzed.Numerical results show that the SRT performance of the proposed JDFR scheme is better than that of the TDFR scheme.Also,it is shown that for the JDFR scheme,a better SRT performance can be obtained by the optimal power allocation(OPA)between the friendly jammer and user.
文摘目的:观察留置头皮针下作业治疗对脑卒中后认知障碍的疗效。方法:研究对象为2017年4月—2019年12月入组的60例脑卒中后认知障碍患者,随机分入研究组和对照组,每组各30例。研究组接受留置头皮针下作业治疗,对照组仅接受作业治疗,均连续治疗4周。使用蒙特利尔认知评估量表(Montreal Cognitive Assessment,MoCA)福州版、简易精神状态检查表(Mini-mental State Examination,MMSE)和改良Barthel指数评价康复治疗前后的认知功能和日常生活活动能力。结果:除对照组康复治疗前后的记忆及延迟回忆能力评分无显著变化以外,2组康复治疗后的MoCA福州版总评分以及其他单项评分均较康复治疗前显著提高(P<0.05)。康复治疗后,研究组的MoCA福州版总评分、视空间与执行功能、定向力、注意、记忆及延迟回忆能力和计算评分均显著高于对照组(P<0.05)。2组康复治疗后的改良Barthel指数和MMSE评分均较康复治疗前显著提高(P<0.05),并且研究组的改良Barthel指数和MMSE评分的改善程度均优于对照组(P<0.05)。结论:留置头皮针下作业治疗能够提高脑卒中后认知障碍患者的认知功能,改善其日常生活活动能力。
