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유리섬유 보강 EP 소재의 피로거동에 미치는 Hole Notch의 영향
이정무(Jeong-Moo Lee),서기정(Ki-Jeong Seo),이은동(Eun-Dong Lee),김태진(Tae-Jin Kim),이언석(Eon-Seok Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper reports on an investigation into the effect of hole notches on the injection molded specimens. In order to evaluate the effects of stress concentration and interaction on fatigue behavior, holes were introduced as notch to simple specimen. The material was used in mPPO. Fatigue tests were conducted at 1-hole notch and 2-hole notch specimens. Also, the FEMFAT was used to predict the fatigue life of different hole notch type conditions. The increase of diameter and quantity of hole notch reduced the fatigue strength and fatigue life. As the distance and angle between two holes increase, the fatigue life of the specimen increases. The prediction of FEMFAT gives valid results by considering the various factors of fatigue effect.
낙상 위험 선별검사 Timed Up and Go test의 예측 타당도 메타분석
박성희,이언석,Park, Seong-Hi,Lee, On-Seok 한국의료질향상학회 2016 한국의료질향상학회지 Vol.22 No.2
Purpose: Globally, falls are a major public health problem. The study aimed to evaluate the predictive validity of the Timed Up and Go test (TUGT) as a screening tool for fall risk. Methods: An electronic search was performed Medline, EMBASE, CINAHL, Cochran Library, KoreaMed and the National Digital Science Library and other databases, using the following keywords: 'fall', 'fall risk assessment', 'fall screening', 'mobility scale', and 'risk assessment tool'. The QUADAS-II was applied to assess the internal validity of the diagnostic studies. Thirteen studies were analyzed using meta-analysis with MetaDisc 1.4. Results: The selected 13 studies reporting predictive validity of TUGT of fall risks were meta-analyzed with a sample size of 1004 with high methodological quality. Overall predictive validity of TGUT was as follows. The pooled sensitivity 0.72 (95% confidence interval [CI]: 0.67-0.77), pooled specificity 0.58 (95% CI: 0.54-0.63) and sROC AUC was 0.75 respectively. Heterogeneity among studies was a moderate level in sensitivity. Conclusion: The TGUT's predictive validity for fall risk is at a moderate level. Although there is a limit to interpret the results for heterogeneity between the literature, TGUT is an appropriate tool to apply to all patients at a potential risk of accidental fall in a hospital or long-term care facility.
건강한 성인에서 시각적 되먹임 훈련이 감각운동겉질의 뮤-리듬에 미치는 즉각적인 효과
김수복 ( Su-bok Kim ),이언석 ( On-seok Lee ) 대한물리의학회 2023 대한물리의학회지 Vol.18 No.3
PURPOSE: A visual feedback method was proposed to induce brain stimulation in a stroke patient, and among them, there was a treatment using a mirror. On the other hand, mirror therapy focuses only on the functional changes in body movements, and analysis of neurophysiological mechanisms of brain activity is lacking. In addition, studies on evaluating the activity and response generated in specific brain regions during visual feedback training using mirrors are insufficient. METHODS: Fifteen healthy adults (male: 10, female: 5, Years: 23.33 ± 1.23), who were right-handed were recruited. By attaching the C3, Cz, and C4 channels in the sensorimotor cortex using an electroencephalogram, training was performed under the conditions without mirror-based visual feedback (No-condition) and with visual feedback (Tasks-condition). At this time, the immediate activity of the mu-rhythm in response to training was separated and evaluated. RESULTS: The tasks-condition of C3, Cz, and C4 channels activated the relative mu-rhythm rather than the no-condition, and all showed significant differences (p < .05). In addition, in all channels at the start time, the tasks-condition was more active than the no-condition (p < .05). The activity of the cortical response was higher in the tasks-condition than in the no-condition (p < .05). CONCLUSION: The mu-rhythm activity can be evaluated objectively when visual feedback using a mirror is applied to healthy subjects, and a basic analysis protocol is proposed.
방사광 경 엑스선 마이크로 단층촬영을 이용한 거머리의 해부학적 3차원 구조분석
이지원(Ji Won Lee),이언석(On Seok Lee) 한국콘텐츠학회 2016 한국콘텐츠학회논문지 Vol.16 No.12
본 연구에서는 거머리의 미세한 해부구조를 3차원적으로 분석 가능한 방사광의 경 엑스선 이미징을 통하여 객관적 분석법 및 생체모사기술 구축을 위한 기초자료를 구축하고자 하였다. 우리는 방사광을 이용하여 거머리의 미세 구조영상을 얻을 수 있었고, 3차원적인 해부학적 분석이 가능함을 확인하였다. 또한 방사광을 통해 얻은 데이터는 내부구조의 미세조직까지 관찰 가능하기 때문에 성분 분석 및 생리적, 기능적 측면으로도 연구의 토대가 될 것으로 사료된다. 더 나아가 추후 거머리로부터 생체모사기술 연구 분야 등에 기여할 수 있을 것이라 기대된다. In this study, we aim to obtain the fundamental data needed for the objective analysis and bio-mimetics of leeches, using x-ray imaging with radiation that allows 3D analysis of the detailed anatomic structures of leeches. It was confirmed that through using radiation, detailed images of leeches can be obtained, allowing 3D analysis of leeches’ anatomical structures. Also, since the data obtained through the radiation allows you to observe the micro-structure, it can serve as a good resource for component analysis, as well as physiological and functional research. More, it is hoped to contribute to further research in the areas of bio-mimetics using leeches.
강동우(Dongwoo Kang),이언석(Eon-Seok Lee),이승현(Seung-hyun Lee),이택민(Taik-min Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Interest in the production of printed electronics using a roll-to-roll system has gradually increased due to its low massproduction costs and compatibility with flexible substrate. To improve the accuracy of roll-to-roll manufacturing systems, the movement of the web needs to be measured precisely in advance. In this paper, a novel measurement method is developed to measure the displacement and velocity of the web precisely and directly. The proposed algorithm is based on the traditional single field encoder principle, and the scale grating has been replaced with a printed grating on the web. Because a printed grating cannot be as accurate as a scale grating in a traditional encoder, there will inevitably be variations in pitch and line-width, and the motion of the web should be measured even though there are variations in pitch and line-width in the printed grating patterns. For this reason, the developed algorithm includes a precise method of estimating the variations in pitch. In addtion, a method of correcting the Lissajous curve is presented for precision phase interpolation to improve measurement accuracy by correcting Lissajous circle to unit circle. The performance of the developed method is evaluated by simulation and the measurement accuracy is less than 6.5um while the web is traveling 100mm.