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위연,임재중 제어로봇시스템학회 2008 제어로봇시스템학회 합동학술대회 논문집 Vol.2008 No.12
This study includes the development of an application for a pressure sensor to obtain pressure pulse oscillation. Forty-five measurements from fifteen subjects (8 males and 7 females) were used for analysis. Correlation coefficients between the traditional auscultatory method and oscillometric method using newly developed algorithm were 0.9651 and 0.9136 for the systolic and diastolic blood pressure values, with the standard deviations of 1.42 and 1.73 mmHg, respectively. The results showed that the newly developed algorithm for oscillometirc method provide accurate blood pressure values. Future study will include the development of a device and the evaluation based on the international standsard, AAMI (association for the advancement of medical instrumentation) and BHS (british hypertension society).
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Will COVID-19 affect consumer irrational behavior? A survey of China's consumer market based on FAHP
위연,황비 글로벌경영학회 2023 글로벌경영학회지 Vol.20 No.3
Under the influence of COVID-19, people's psychology and consumer behavior have changed somewhat from the pandemic, and these changes have not only affected the stability of society but also created obstacles for the government to maintain the balanced and healthy development of the national economy. Our study uses a two-step approach to investigate the factors influencing the irrational shift in residents' consumption behavior under COVID-19. In the first step, FAHP was executed to determine the relative importance of the factors in the proposed research model. In the second step, the study hypotheses were tested using SEM with data from 150 respondents in 66 cities across 20 provinces in China. The FAHP results show that perceived scarcity has the highest weight of influence on irrational shifts in consumer behavior under COVID-19. The empirical findings suggest that perceived scarcity, bad mood, and changes in consumer preferences partially mediate the irrational changes in residential consumption behavior during a pandemic. Meanwhile, residents' positive perceptions of government pandemic prevention measures partially negatively moderated the generation of irrational consumer behavior during the pandemic. Thus, our study not only achieves interdisciplinary theoretical and methodological integration but also provides the government with a quantitative measure of the utility of COVID-19 management measures in mitigating irrational changes in residents' consumption behavior during a pandemic. Not only can we enrich the literature on irrational consumption behavior in related consumption behavior studies, but also provide theoretical, empirical, and practical case support for the Chinese government's response to control the irrational consumption behavior of the population under public health emergencies.
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이성,위연,임재중 제어로봇시스템학회 2008 제어로봇시스템학회 합동학술대회 논문집 Vol.2008 No.12
This study was performed for evaluating clinical validity of PWV system, PP-1000, used for early diagnosis of arterial disease based on Bland-Altman analysis. Seventeen subjects were participated for the repeatability and reproducibility study. Another nineteen subjects were participated for the comparison of the PWV values among commercially available devices, PP-1000, VP-2000, and VP-1000. Results showed that the Frank method revealed the most accurate results, and the PP-1000 provided the most accurate reproducibility.
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지덕근 ( Duk Keun Jee ),위연 ( Ran Wei ),임재중 ( Jae Joong Im ),김희선 ( Hee Sun Kim ),김현정 ( Hyun Jeong Kim ) 한국감성과학회 2011 감성과학 Vol.14 No.4
In this study, the parameters of Polysomnography (PSG) test, such as total sleep time, snoring time, had been analyzed to evaluate the effectiveness of a developed anti-snore pillow. The developed anti-snore pillow is made up of two polyvinylidene fluoride (PVDF) vibration sensors, pumps, valves, and air bladders. The two PVDF sensors inside the pillow can acquire the sound signals and the algorithm was perfectly designed to extract snoring by removing unwanted noise accurately and automatically. Once the pillow recognizes snore, a pump inside the hardware activates, and a bladder under the neck area inside the pillow will be inflated. The PSG test was used and two volunteers were participated for the study. The parameters of the PSG results were analyzed to evaluate the effectiveness of the anti-snore pillow. The total sleep time of each volunteer was similar on each phase of test, but the snoring time and the longest snoring episode were significantly decreased with the use of anti-snore pillow. The overall results showed excellent possibilities for reducing snoring for the person who snores during sleep by using the anti-snore pillow. The effectiveness of the anti-snore pillow can be evaluated by the PSG test. Moreover, the relationship between each parameter of PSG test and the quality of sleep will be used for further researches.
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Polyvinylidene Fluoride 진동센서를 이용한 코골이 검출
지덕근 ( Duk Keun Jee ),위연 ( Ran Wei ),김희선 ( Hee Sun Kim ),임재중 ( Jae Joong Im ) 한국감성과학회 2011 감성과학 Vol.14 No.3
Sleep diseases such as snoring and sleep apnea are physically, mentally harmful and results serious health problems. Snoring, known as breathing noise, is caused by coupled oscillation of the airway when the air passes through the trachea, and sleep apnea is caused by upper airway blockage. In order to solve these problems, many attempts have been made to detect the snoring during sleep and alleviate it. In this study, a new sensing system and analysis algorithm were developed in order to detect snoring sounds correctly under various sleep environments. Two polyvinylidene fluoride (PVDF) vibration sensors were used inside the pillow. The first PVDF sensor detects vibration transmitted through skull caused by snoring. And the second PVDF sensor detects both snoring sounds and ambient noises. The signals of two sensors were acquired through the designed analog circuits, and analyzed for snoring detection. Ten volunteers were participated for the experiment under five different conditions. Data from two PVDF sensors were processed by the established analysis algorithm, and snoring sounds were compared to noises. The results indicated that the energy of snoring is 70% bigger than that of ambient noise, which proves effectiveness of sensing system and analysis algorithm. Further study would be continued for more wide clinical studies with various environment noises. Based on this study, development of anti-snore pillow and sleep monitoring system for comfort sleep could be developed.
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