탑 드라이브 머신 기어박스 신뢰성 평가 방법

유찬욱,김정환,정한영 해양환경안전학회 2018 해양환경안전학회 학술발표대회 논문집 Vol.2018 No.06

등가물성 적용한 해수 strainer filter부 구조 강도 평가

유찬욱,최주형,김정환,김정렬 한국유체기계학회 2015 한국유체기계학회 학술대회 논문집 Vol.2015 No.12

유분 분리용 cyclone 형상 최적화 연구

유찬욱,최주형,김정환,장호길,김정렬 한국유체기계학회 2016 한국유체기계학회 학술대회 논문집 Vol.2016 No.06

Body Composition Var iations for Cerebral Infar ction Patients Classified as Male and Female in Long-term Car e Hospitals

유찬욱,황영준,김건호,한은주,전계록,김재형 한국멀티미디어학회 2018 멀티미디어학회논문지 Vol.21 No.6

Indicators to quantitatively assess the physical conditions can help optimize the effectiveness of rehabilitation therapy for stroke patients. The body composition variations in the paretic and non-paretic regions of stroke patients with cerebral infarction (7 males, 31 females) were analyzed using multi-frequency bioelectrical impedance. Specifically, resistance (R), lean mass (LM), fat mass (FM), extracellular water (ECW), intracellular water (ICW), R/LM relation, basal metabolic rate (BMR)/LM relation were utilized to evaluate the paretic and non-paretic regions of subjects with cerebral infarction. These values showed significant differences in gender and paretic/non-paretic regions. R and FM were high but LM and ICW were lower in female and paralysis. ECW was lower in females than males, but there was no considerable difference between paralysis and non-paralysis in both males and females. In addition, there was an inverse distribution between R and LM in paretic and non-paretic regions, with males on the upper left and females on the lower right. Furthermore, the relationship between BMR and LM showed excellent linearity (slope: 22.17 kcal/day/kg) irrespective of gender, paralysis, and non-paralysis. An easy, non-invasive and quantitative assessment using bioelectrical impedance would provide an useful tool for evaluating patients with cerebral infarction receiving rehabilitation therapy.

Comparison of Impedance Parameters and Occupational Therapy Evaluation in the Paretic and Non-paretic Upper Extremity of Hemiplegic Stroke Patients

유찬욱,김재형,황영준,김건호,신용일,전계록 한국멀티미디어학회 2017 멀티미디어학회논문지 Vol.20 No.12

Many stroke patients undergoing rehabilitation therapy require a quantitative indicator for the evaluation of body function in paretic and non-paretic regions. In this study, the impedance parameters were acquired to assess the physical status in the upper extremity of thirty six stroke patients with hemiplegia caused by cerebral hemorrhage (10 patients) and cerebral infarction (26 patients), using bioelectrical impedance. Prediction marker (PM), phase angle (PA), PM/PA, and resistance (R) versus reactance (Xc) were utilized to evaluate the functional status of the paretic and non-paretic regions. In addition, the hand grip strength (HGS) and the pinch strength (lateral, palmer, tip) were measured on the upper extremity of hemiplegic stroke patients. PM was distributed in inversely proportional to HGS, but PA was distributed in proportional to HGS. However, there were a number of patients with HGS of 0, regardless of the impedance parameters (PM, PA, R vs. Xc). Paretic and non-paretic status in upper extremity of these patients could not be analyzed using impedance parameters. At the rehabilitation therapist's instructions, they were unable to move the hand and fingers of the paretic upper extremity by cranial nerve damage, motor nerve damage, and severe cognitive decline.

바이오 임피던스 분석을 이용한 노인 뇌졸중 편마비 환자의 하지 분석

유찬욱 고령자･치매작업치료학회 2017 고령자.치매작업치료학회지 Vol.11 No.2

Objective : This study is to compare and analyze the bioelectrical impedance values on the lower extremity (affected and non-affected side) in hemiplegic stroke older patients. Methods : Experimental subjects were 24 stroke patients with hemiplegia undergoing stroke rehabilitation between October to November, 2015. Prediction marker, resistance, reactance, and phase angle were measured in the lower extremity (affected and non-affected side) of hemiplegic stroke patients, using MultiScan 5000, and then they were expressed as quantified values. Results : The affected and non-affected side of lower extremity in stroke older patients with hemiplegia exhibited significant differences in prediction marker, reactance, and phase angle (p<0.05). Conclusion : There were significant differences in the impedance values at the affected and non-affected side of hemiplegic stroke older patients. Thus, the possibility of evaluating stroke patients undergoing clinical rehabilitation therapy was suggested. 목적: 본 연구는 노인 뇌졸중 편마비 환자 22명을 대상으로 하지부위에 마비측과 비마비측의 바이오 임피던스 값을 비교 분석하고자 하는 것이다. 연구방법: 본 연구에서는 2015년 10월부터 11월 까지 뇌졸중으로 진단 받은 편마비환자 22명을 대상으로 하였다. MultiScan5000을 이용하여 바이오임피던스를 측정하였고 프래딕션마커(prediction mark), 저항성분(resistance), 리액턴스(reactance), 위상각(phase angle)을 비교분석하였다. 연구결과:뇌졸중 편마비 환자의 마비측과 비마비측 부위에서 임피던스 값을 측정하여 정량화된 수치로 나타낸 결과 뇌졸중 편마비 환자의 마비측과 비마비측의 프래딕션마커(prediction mark), 리액턴스(reactance), 위상각(phase angle)의 값의 유의한 차이를 보였다(p<0.05). 고찰:본 연구 결과를 통해 뇌졸중 편마비 환자의 하지에 마비측과 비마비측의 임피던스값의 유의한 차이가 있다는 것을 알 수 있었고 또한, 이를 통해 임상의 재활치료를 받는 뇌졸중 환자의 치료에 정량화된 수치로 측정할 수 있는 유용한 평가도구로서의 가능성을 제시하였다

컴퓨터 인지재활 프로그램이 노인 뇌졸중 환자의 인지향상에 미치는 효과

유찬욱 대한고령친화산업학회 2009 대한고령친화산업학회지 Vol.1 No.2

연구목적 본 연구에서는 인지기능의 장애를 보이는 노인 뇌졸중 환자에서 컴퓨터를 이용한 인지치료가 인지 기능에 미치는 효과에 대해 알아보기 위함이다. 연구방법 뇌졸중 노인 환자 40명(남자22명, 여자18명)을 두 집단(실험군, 대조군)으로 무작위할당하고, 대조군 은 작업치료를 포함한 고식적인 치료를 실험군은 고식적인 치료와 함께 컴퓨터 인지재활치료를 매 일 30분 주당5회 총6주간 훈련을 하였고, 모든 대상자들은 실험 전후로 인지평가인 LOTCA와 독 립적인 일상생활활동의 평가인 FIM을 측정하여 비교분석 하였다. 연구결과 실험 전 평가에서는 두 집단 간 인지기능과 독립적인 일상생활활동 점수에서 통계적으로 유의한 차 이는 없었다. 4주간 치료 후 실험군에서는 대조군에 비해 시운동과 분류력 등 인지능력평가에서 통 계적으로 유의한 점수상승을 보였으며(P<.05), 독립적 일상생활 활동 점수에서는 대조군에 비해 통 계적으로 유의한 점수상승을 보이지 않았다(P>.05). 결론 본 연구를 통하여 컴퓨터 인지재활 프로그램인 Rehacom은 인지기능의 향상을 보였고, 인지장애를 보이는 노인 뇌졸중 환자에게 유용한 치료도구가 될 수 있을 것으로 생각된다.

Bioelectrical Impedance Analysis on the Paretic and Non-paretic Regions of Severe and Mild Hemiplegic Stroke Patients

유찬욱,양영애,백승완,김재형,전계록 한국멀티미디어학회 2017 멀티미디어학회논문지 Vol.20 No.2

For many stroke patients undergoing rehabilitation therapy, there is a need for indicator for evaluating the body function in paretic and non-paretic regions of stroke patients quantitatively. In this paper, the function of muscles and cells in paretic and non-paretic regions of severe and mild hemiplegic stroke patients was evaluated using multi-channel bioelectrical impedance spectroscopy. The paretic and non-paretic regions of severe and mild stroke patients were quantitatively assessed by using bioelectrical impedance parameters such as prediction marker (PM), phase angle (θ), characteristic frequency (fc), and bioelectrical impedance vector analysis (BIVA). The mean values of impedance vector were significantly discriminated in all comparisons (severe-paretic, severe-non-paretic, mild-paretic, and mild-non-paretic). The bioelectrical impedance parameters were proved to be a very valuable tool for quantitatively evaluating the paretic and non-paretic regions of hemiplegic stroke patients.

선박용 질소발생장치 효율 증대를 위한 mixing chamber 설계 변경 방안 연구

유찬욱,최주형,김정환,신원협,류영춘,이경우,김정렬 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

Petroleums or chemical cargo transported Tankers are have to be installed inert gas system to prevent explosion. Inert gas system is to ensure that less than 5% the oxygen content in the cargo tanks condition to avoid the explosion range. In the nitrogen generation type inert gas system, the flow control within the Mixing Chamber has more effect of the overall N2 ratio. In this paper, study for N2 ratio rise method by mixing chamber`s inner design change use computational analysis methods.

영상표시단말기 사용 시 머리굽힘자세가 어깨근육의 근 활성도에 미치는 영향

유찬욱 ( Chan Uk Yoo ),조남정 ( Nam Jung Jo ) 한국고령친화건강정책학회 2011 대한고령친화산업학회지 Vol.3 No.2

연구목적: 본 연구는 영상표시단말기 사용 시 머리굽힘자세(flexed neck posture)와 중립머리자세(neutral neck posture)에 따른 어깨근육의 근 활성도 변화를 알아 보기위해 수행하였다. 연구방법: 본 연구는 근골격계질환이 없는 성인 남녀 대학생 16명을 대상으로 실시하였으며, 영상표시단말기 사용 시 표면 근전도 시스템을 이용하여 머리굽힘자세(자세1),중립머리자세(자세2)에서 위등세모근의 근 활성도를 측정하였다. 근전도 신호는 %RVC(reference voluntary contraction)로 표준화하였고 두 자세간의 근 활성도를 SPSS 14.0을 이용한 짝비교 t-검정(paired t-test)을 하여 비교분석하였다. 연구결과: 자세 1에서 위등세모근의 근 활성도 %RVC의 평균은 왼쪽이 4.6%, 오른쪽이 4.4%이었고, 자세 2에서는 왼쪽이 3.9%, 오른쪽이 3.5% 으로 나타났다. 위등세모근은 자세 1에서 근 활성도가 유의하게 증가하였다(p<0.05). 결론: 중립머리자세는 머리굽힘자세 보다 위등세모근의 근 활성도를 감소시킬 수 있으므로 영상표시단말기 사용 시 중립머리자세를 유지하는 것이 어깨근육의 부담을 줄일 수 있을 것이다. Objective : The aim of this study was to determine the electromyographic(EMG) activity of shoulder muscles while watching Video Display Terminal(VDT) with flexed neck and neutral neck posture. Methods : Sixteen students performed works with flexed neck posture(posture 1) and neutral neck posture( posture 2). Electromyographic activity of the upper trapezius was measured in each posture. The EMG amplitude was normalized using the reference voluntary contraction(RVC). A paired t-test was used to compare the difference in the activity of each muscle in posture 1 and posture 2. Collected data were analyzed by SPSS 14.0. Results : The mean %RVC of the upper trapezius was 4.6%(left), 4.4%(right) in posture 1 and 3.9% (left), 3.5%(right) in posture 2. There was significant difference in the EMG amplitudes of both upper trapezius in posture 1(p<0.05). Conclusion : Muscle activity of both upper trapezius is increased in flexed neck posture. To reduce loading in the shoulder muscles during VDT working, the head must be maintained in neutral head posture.