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基于盲源分离的损伤识别方法 被引量:4
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作者 林友新 周翠 李宏男 《地震工程与工程振动》 CSCD 北大核心 2013年第6期158-163,共6页
考虑环境因素和结构运行状态的损伤识别方法,在结构健康监测中越来越受到人们的关注。本文利用监测中提取的结构振动特征,提出基于盲源分离的损伤识别算法。该算法通过盲源分离中的AMUSE法可以将信号分为环境源和损伤源,其优点是不需要... 考虑环境因素和结构运行状态的损伤识别方法,在结构健康监测中越来越受到人们的关注。本文利用监测中提取的结构振动特征,提出基于盲源分离的损伤识别算法。该算法通过盲源分离中的AMUSE法可以将信号分为环境源和损伤源,其优点是不需要测量环境因素即可去除环境源影响。当结构处于健康状况时,结构损伤源信号很小;但当损伤发生后,该源会急剧增大。以预应力混凝土梁作为数值算例对该方法进行验证,温度作为影响结构反应的环境条件,且温度与结构特征参数具有非线性关系,算例成功地剔除了环境因素的影响,增大了结构损伤识别预警的准确性。 展开更多
关键词 损伤识别 盲源分离 环境因素 温度效应 AMUSE
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基于盲源分离的P300脑电信号特征提取方法的研究 被引量:3
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作者 张立国 张玉曼 +2 位作者 金梅 金菊 于国辉 《计量学报》 CSCD 北大核心 2015年第6期634-637,共4页
P300脑电信号被广泛应用于脑认知、脑机接口,该信号强度弱,容易受到环境及眼动伪迹、心电、肌电和自发脑电信号的干扰,淹没在采集脑电信号中。为了将P300与各种干扰快速高效地分离开来,通过分析P300在时域、频域和头皮空间域的特征... P300脑电信号被广泛应用于脑认知、脑机接口,该信号强度弱,容易受到环境及眼动伪迹、心电、肌电和自发脑电信号的干扰,淹没在采集脑电信号中。为了将P300与各种干扰快速高效地分离开来,通过分析P300在时域、频域和头皮空间域的特征,提出了以相干平均和小波变换与盲源分离相结合的算法,从时频域和空域对P300进行特征提取,针对多导联脑电信号盲源分离后选取P300成分对应分量的问题,提出了一种新的方法,并且通过实验比较了Informax、FastlCA和AMUSE等3种盲源分离算法在P300特征提取中的性能。实验结果表明,从时频空域对P300特征提取的性能较仅从时频域进行特征提取有明显提高。 展开更多
关键词 计量学 P300 脑电信号 特征提取 盲源分离 Informax FASTICA AMUSE
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基于盲源分离的结构模态参数识别 被引量:7
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作者 张晓丹 姚谦峰 《振动与冲击》 EI CSCD 北大核心 2010年第3期150-153,共4页
提出一种结构模态参数识别的新方法。该方法以盲源分离理论中基于二阶统计量的AMUSE算法为基础,通过对测试数据Hilbert变换构建分析数据矩阵,通过求解不同时滞下数据协方差矩阵的广义特征值问题实现对结构模态参数的识别。数值算例结果... 提出一种结构模态参数识别的新方法。该方法以盲源分离理论中基于二阶统计量的AMUSE算法为基础,通过对测试数据Hilbert变换构建分析数据矩阵,通过求解不同时滞下数据协方差矩阵的广义特征值问题实现对结构模态参数的识别。数值算例结果表明,该方法不仅适用于实模态情况,同时适用于复模态情况,且计算简单,识别精度高,对测量白噪声有很好的鲁棒性。 展开更多
关键词 模态参数识别 盲源分离 AMUSE算法 复模态
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Research on the Security Monitoring of the Amusement Ride of Tourist Sites Based on RFID 被引量:2
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作者 Jian SHANGGUAN Yingchun LV Mu ZHANG 《Wireless Sensor Network》 2010年第1期85-91,共7页
RFID (Radio Frequency Identification) is a new technology making use of radio frequency to do non-touch- ing, two-way data transit between the reader and the electronic tag to identify target and exchange data. Becaus... RFID (Radio Frequency Identification) is a new technology making use of radio frequency to do non-touch- ing, two-way data transit between the reader and the electronic tag to identify target and exchange data. Because it is non-touching;it can work from long distance;it is fit to work in an unfavorable environment;it can identify moving target, it is widely used in industry, commerce, storage, transportation. This paper introduces the application of the RFID technology and its state of development and discusses the general situation of its application in different fields. Moreover, this paper takes the tourist mini-train as an example, designs a security monitoring system based on RFID and discusses its application in tourist industry. 展开更多
关键词 RFID TAG AMUSEMENT RIDE Security Monitoring
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Influence of a Program Combining Amusement and Exercise on Subjective Well-Being: Six-Month Intervention Study with a Complex-Type Program for Community-Dwelling Elderly Subjects
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作者 Nami Kawabata Tadayuki Iida +5 位作者 Hideki Miyaguchi Masafumi Kunishige Chinami Ishizuki Hiroko Hashimoto Yasuhiro Ito Toshihide Harada 《Open Journal of Preventive Medicine》 2018年第8期266-281,共16页
Background: Health promotion for the elderly mainly targets improvements in physical function, and a lack of strengthening of subjective well-being as well as the creation of interaction-providing opportunities for ac... Background: Health promotion for the elderly mainly targets improvements in physical function, and a lack of strengthening of subjective well-being as well as the creation of interaction-providing opportunities for activity and participation has been reported. Evaluations of positive and negative aspects for subjective well-being are needed. Elderly subjects were intervened through a 6-month complex-type program combining amusement and exercise and its influences on subjective well-being and physical and physiological functions were investigated. Methods: Subjects in this survey were 37 healthy elderly females living in M city, Hiroshima Prefecture (age: 69.7 ± 5.9 years old), and the survey was performed between September 2016 and March 2017. The complex-type program comprised amusement and exercise programs. The survey was performed at 4 time points during the intervention period: before the intervention and 1, 3, and 6 months during the intervention. Subjective well-being (Japanese version of the Subjective Well-being Inventory (SUBI): Mental health scores, Mental fatigue scores), salivary amylase levels, and the locomotive syndrome risk test (two-step test, stand-up test, and 25-question risk assessment) were surveyed at each time point. Regarding the duration of the intervention as a factor, changes in salivary amylase levels were analyzed using repeated measures one-way ANOVA and SUBI was tested using the Friedman test (EZR Ver 1.32). In addition, the relationship between the locomotive syndrome risk level and duration of the intervention was examined using Fisher’s test. Results: SUBI and the locomotive syndrome risk level significantly differed with time during the intervention. Slight changes were observed in salivary amylase levels during the intervention. Conclusion: The present results suggest that the complex-type program promoted interactions among community-dwelling elderly subjects and positively influenced the maintenance of and improvements in physical and physiological functions. These changes may be associated with favorable influences on the positive and negative aspects of subjective well-being. 展开更多
关键词 Subjective WELL-BEING SUBI The Elderly AMUSEMENT EXERCISE
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JClic Crosswords in Chemistry Class
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作者 Maria de los Angeles Montiel Montoya 《Journal of Chemistry and Chemical Engineering》 2015年第4期303-308,共6页
Eight crosswords made in JClic were applied to twenty nine students from group 654, in area 2, at ENP (national preparatory school) No. 4 (a national public high school) in order to review Unit 2 and introduce the... Eight crosswords made in JClic were applied to twenty nine students from group 654, in area 2, at ENP (national preparatory school) No. 4 (a national public high school) in order to review Unit 2 and introduce the following Unit of Chemistry IV. Two surveys were applied in scholars in order to evaluate: the application of crosswords and of ICT (information and communications technology). The results show that students like ICT because it is a relaxing mechanism to learn, JClic games were also liked by the majority due to the team work, so it induces to considerable learning. 展开更多
关键词 ICT JClic amusing teaching-learning activities crosswords organic chemistry.
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Amusing Stories on Beijing's Specialties
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《China's Foreign Trade》 2001年第3期27-28,共2页
关键词 Amusing Stories on Beijing’s Specialties EMPEROR WANG
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盲源分离中AMUSE算法的分离效果试验研究
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作者 张启明 《河南科技》 2021年第13期19-21,共3页
目前,盲源分离技术广泛应用于电子信号处理领域,但盲源分离中各算法的分离效果具有较大差异。对此,本文以盲源分离理论中的AMUSE算法为研究对象,通过MATLAB生成的周期性函数信号和随机收集的4种语音信号进行仿真试验,并选取相似系数作为... 目前,盲源分离技术广泛应用于电子信号处理领域,但盲源分离中各算法的分离效果具有较大差异。对此,本文以盲源分离理论中的AMUSE算法为研究对象,通过MATLAB生成的周期性函数信号和随机收集的4种语音信号进行仿真试验,并选取相似系数作为AMUSE算法的评价准则。试验结果以及评价准则表明,AMUSE算法对信号的分离效果出色,且对噪声具有较好的鲁棒性。 展开更多
关键词 盲源分离 AMUSE算法 信号处理 仿真试验
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Structure and anti structure --"the custom of amusing the parents-in-law" under the perspective of the liminality theory
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作者 Abdou Harder 《International English Education Research》 2014年第5期54-56,共3页
The custom of amusing the parents-in-law is one of the most important amusement contents of the civil marriage ceremony in the Chinese North Han, Hui, Dongxiang, Salar, Baoan and other several nationalities, and curre... The custom of amusing the parents-in-law is one of the most important amusement contents of the civil marriage ceremony in the Chinese North Han, Hui, Dongxiang, Salar, Baoan and other several nationalities, and currently it has fully been entertained in the minds of the people. Behind this "entertaining ceremony" of the festive colors hide the serious social expectations of our ancestors -- scrupulously abide by the filial piety and the sense of propriety, justice, honesty and honor. Through the dramatic performance methods in the wedding that "there is no degree of seniority for three days", "humiliate the parents-in-law" and "the father-in-law shoulders on back the danghter-in-law" and so on, they stress that these acts are the "sacrilege" that cannot be violated in the normal state of the society. The ways and means of "metaphor" in the ceremony of the ancestors are the means that many of the human groups adopt in the life etiquette and other "transition" etiquettes. In this regard, the anthropologist Victor Turner summarizes it as "liminality", and based on this theory, the author conducts an interpretive study of the metaphor behind the custom of amusing the parents-in-law. 展开更多
关键词 The custom of amusing the parents-in-law liminality theory social structure
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Confuse and Amuse
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作者 Francisco Little 《ChinAfrica》 2013年第10期60-60,共1页
CHINESE are well known for their desire to learn English and practice on unsuspecting foreigners, with levels of spoken and written English improving remark- ably across the country in recent years. One stand out, how... CHINESE are well known for their desire to learn English and practice on unsuspecting foreigners, with levels of spoken and written English improving remark- ably across the country in recent years. One stand out, however, has not kept pace with the levels of people's English. Every foreigner who has traveled or lived in China will have a story to tell about an English- language sign that has been lost in translation. 展开更多
关键词 Confuse and Amuse
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二阶统计量盲辨识在模态参数识别中的应用 被引量:5
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作者 姚谦峰 张晓丹 《工程力学》 EI CSCD 北大核心 2011年第10期72-77,共6页
快速、准确地识别出结构的模态参数,是结构损伤精确识别与健康监测的重要前提。该文提出一种结构模态参数识别的新方法。该方法以盲源分离理论中基于二阶统计量的AMUSE算法为基础,以振动系统的自由响应或脉冲响应为分析对象,通过对数据... 快速、准确地识别出结构的模态参数,是结构损伤精确识别与健康监测的重要前提。该文提出一种结构模态参数识别的新方法。该方法以盲源分离理论中基于二阶统计量的AMUSE算法为基础,以振动系统的自由响应或脉冲响应为分析对象,通过对数据进行Hilbert变换增加虚拟测点,以不同时滞下数据协方差矩阵构建联合矩阵,通过求解时滞联合矩阵的特征值问题实现对结构模态参数的识别。联合矩阵的引入克服了AMUSE算法仅采用两个时滞协方差矩阵所带来的不稳定性。数值算例结果表明,该文提出的方法计算简单,识别精度高,不受时滞选择的限制,对测量白噪声不敏感,具有很好的鲁棒性。 展开更多
关键词 模态参数识别 盲辨识 二阶统计量 AMUSE算法 鲁棒性
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An Amusing Car Accident
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作者 倪俊 《当代外语研究》 2001年第3期36-36,共1页
It was about midnight. My son was riding in the back seat with a friend of his in acar driven by a Chinese schoolmate, when a police car suddenly approached frombehind with its siren sounding ominously. The driver imm... It was about midnight. My son was riding in the back seat with a friend of his in acar driven by a Chinese schoolmate, when a police car suddenly approached frombehind with its siren sounding ominously. The driver immediately stopped his car bythe roadside and stepped out to see what was happening. Just at that moment, heseemed to hear a policeman shouting to him: "Back your car!" (Actually, his 展开更多
关键词 An Amusing Car Accident
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