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3-D 동작 분석 장치를 이용한 한국성인(20대, 30대)의 동작 범위에 관한 연구
임현균,김진호,박수찬,류신아,이영신 한국운동역학회 1998 한국운동역학회지 Vol.8 No.2
Devices, such as a goniometer, have been used to measure a human being's active range of motion, but interferences between subjects and testers have affected the result precision. In this study, 56 dynamic motion ranges were measured using a 3-D motion analysis system which is quite accurate (2mm error for 1m). The 3-D motion analysis system consists of VICON 140, data acquisition system, and data analysis program (KRISSMAS). 80 Korean subjects (40 males, 28±6.1 aged and 40 females, 28.4±6.9 aged) participated. Subjects were divided into 4 groups by Ro¨hrer's index based on National Anthropometric Survey of Korea 1997. Basic statistical analysis were performed using SPSS (ver. 8.0) programs after refining data. Various comparisons were performed for the right and left side, male and female, age groups (20's, 30's. and 40's-60's) using previous studies. The results show that female subjects have more flexible joints in the neck, hip, ankle, and wrist, while male subjects have more flexibility in their waist. But most of the significances were not high (>0.05). The prediction that the right side of Korean bodies would be mort flexible was not a good hypothesis. And the joints flexibilities are not correlated with Ro¨hrer's Index.
Hyun Kyoon Lim,Jooyeon Ko 대한인간공학회 2018 大韓人間工學會誌 Vol.37 No.6
Objective: This study examined the reliability and validity of the Korean version of the Cerebral Palsy Quality of Life (CP QOL) questionnaire. Background: Quality of life (Qol) for the children with cerebral palsy (CP) is also essential aspect of the functioning. However, few Qol assessment tools specific to CP are available in South Korea. Method: The English version of the Cerebral Palsy Quality of Life (CP-QOL) parent proxy form and the CP-child self-report form was translated into Korean. This study was to verify the reliability and validity of the two Korean versions of the CP-QOL documents. A total of 153 primary caregivers and 61 CP children answered the Korean questionnaires in two sessions two weeks apart. The reliability and validity were analyzed using the intra-class correlation coefficient (ICC), Cronbach"s α, and ANOVA. Results: Cronbach"s α ranged from 0.80 to 0.92 for the Korean version of the CPQOL (K-CP-QOL) parent proxy form and from 0.84 to 0.96 for the child self-report form. All ICCs were above 0.75 except for emotional well-being and pain for the parent proxy form. For the K-CP-QOL child self-report form, all ICCs were 0.75 except for pain. There were significant differences in the feeling about function, emotional well-being, pain, and participation by the CP functional severity. Conclusion: The K-CP-QOL parent proxy and child self-report forms appear to be valid to use for Korean CP children and their parents. Application: Korean version of the CP-Qol could be used for both of clinical and research purposes.
Signal Amplitude Ratio of Magnetocardiogram Between Sensor Assembly and Chest Surface
Hyun Kyoon Lim,Kiwoong Kim,Hyukchan Kwon,Yong-Ho Lee IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>Magnetocardiography (MCG) using a superconducting quantum interference device (SQUID) sensor has been known for a noninvasive, noncontact, and safe diagnostic tool to detect ischemic heart disease such as angina and myocardial infarction. The magnetic distribution generated by the electrical activation of the heart reveals the abnormality of the myocardial status. The bust depth of people in 20s and 70s are much different, and the greatest difference is up to 154 mm. The purpose of this study is to identify whether MCG signals and parameter values are changed at the different locations of the SQUID sensor assembly. It would be an important reference for the standard measurement. Four healthy male subjects (33.3 plusmn 6.3 years) participated in this study. The distance between the chest surface and the bottom of the sensor assembly was 20, 40, 60, and 80 mm. Recording was made using 64-channel MCG system (axial type, first-order gradiometer) developed by Korea Research Institute of Standards and Science (KRISS). MCG were recorded for 30 s in a magnetically shielded room. As the sensor location is getting away from the chest surface, the each mean amplitude of R- and T-wave peak decreases to 70% (at 40-mm distance), 51% and 50% (at 60 mm), and 38% and 35% (at 80 mm) of the reference amplitude measured at 20-mm distance (<I>y</I> = -0.000002*<I>x</I> <SUP>3</SUP> + 0.0003*<I>x</I> <SUP>2</SUP> - 0.0308*<I>x</I> + 1.4961, <I>R</I> <SUP>2</SUP>=1.00; where <I>y</I>= average amplitude remained after reduction}, <I>x</I> = distance between the chest surface and sensor location). Interindividual difference was less than 5%. The regression equations may be used as a good reference to calculate how much strength will be decreased by the distance. In MCG parameters, most parameters decreased when the distance increased. As an example, the current moment at T-wave peak reduced to 52% (at 40-mm distance), 33% (at 60 mm), and 19% (at 80 mm). Results showed how MCG signal and parameter values decreased rapidly when the sensor assembly was located far from the signal source. The study results may be used as a useful reference to design MCG system and analysis program.</P>
Can magnetocardiography detect patients with non-ST-segment elevation myocardial infarction?
Lim, Hyun Kyoon,Chung, Namsik,Kim, Kiwoong,Ko, Young-Guk,Kwon, Hyukchan,Lee, Yong-Ho,Kim, Jin-Mok,Joung, Boyoung,Kim, Jin-Bae,Yu, Kwon Kyu,Cho, Jung-Rae,Kim, In-Seon,Park, Yong Ki Informa Healthcare 2007 Annals of medicine Vol.39 No.8
<P> Background and aim. Magnetocardiography (MCG) has been proposed as a noninvasive diagnostic tool to risk-stratify patients with myocardial infarction (MI) and ischemia. The purpose of this study is to find the MCG parameters that are sensitive enough to detect the non-ST-segment elevation myocardial infarction (NSTEMI) patients. Methods. MCG data were recorded and analyzed from 165 young controls (mean age = 27.2±9.0 years), 57 age-matched controls (mean age = 55.9±10.5 years) and 83 NSTEMI patients (mean age = 59.7±11.1 years). The MCG recordings were obtained using a 64-channel MCG system in a magnetically shielded room. Statistical analyses were performed for 24 parameters derived from QRS-, R-, T-wave, and ST-T period. Binary boundaries to detect NSTEMI patients out of control subjects were found using the receiver operating characteristic (ROC) curve for each parameter. Results. Fifteen parameters showed a significant difference (P<0.05 and P<0.01) between NSTEMI and both of the control groups. For detection of NSTEMI, the angle of the maximum current and the filed map angle on T-wave peak showed the highest diagnostic performance from 75% to 92% including accuracy, sensitivity, specificity, positive predictive value, and negative predictive value (area under ROC curve = 0.87∼0.93). Conclusions. Our study showed that MCG has potential clinical application for detection of NSTEMI and should be further investigated.</P>
임현균(Hyun Kyoon Lim),박세진(Se-Jin Park),황지수(Jisoo Hwang),박승남(Seung-Nam Park),김시경(Sikyung Kim),이근우(Geun Woo Lee),김승관(Seung Kwan Kim),박성종(Seongchong Park),오승빈(Seung Bin Oh),노기용(Ki Yong Noh),김원식(Wuon-Shik K 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
Lighting for home and road in modern society is one of the most important design factors. To date, standards for colors to human sensation are well made under the bright (=photopic vision) and dark (=scotopic vision) environment. However, the measurement method is not objective and therefore, new method is in need. In this study, we recorded electroencephalogram while a subject was watching light-emitting diode (LED) panel. Red, green, and blue color appeared sequentially from dark (=0) and to the most bright color level (=256) step by step. A subject was asked to press a button when he/she see any colors on the screen. EEG data from five subjects (34 ? 5.9 years) was analyzed. As results, subjects pressed button 37.1 seconds for red, 36.5 s for green, and 36.5 s for blue. Subjects showed also EEG changes by optical stimulation post onset of lighting stimulation. As a conclusion, EEG analysis may be a new objective measurement method to detect brain response by the optical stimulation. To get firm evidence for the response, additional subjects should be recruited more in the same test. Test-retest reliability should be also made for the evidence based standards of visual sensitivity.