타악기를 활용한 과제지향운동이 만성 뇌졸중 환자의 상지 기능에 미치는 영향

김주학 ( Ju-hak Kim ),김명권 ( Myoung-kwon Kim ) 대한물리의학회 2021 대한물리의학회지 Vol.16 No.4

PURPOSE: This study examined the effects on the upper extremity function, muscle strength, and hand function of a task-oriented training approach using a percussion instrument for patients with chronic stroke. METHODS: Twenty-four chronic stroke patients accompanied with upper extremity hemiplegia were selected for research and were classified randomly into 12 experimental groups and 12 control groups. The experimental group performed a task-oriented approach, and the control group performed upper extremity occupational therapy. Stroke upper extremity test, Jebsen-Taylor Hand Function test, upper extremity muscle strength test, and hand muscle strength test were measured before and after training in the evaluation process. RESULTS: In the upper extremity test and Jebsen-Taylor test, there were no significant differences between the groups. In the upper extremity muscle strength test, there were significant differences in shoulder flexion, internal rotation, and elbow flexion in the experimental group. In the hand muscle strength test, there were significant differences in the grip, tip Pinch, lateral Pinch, and 3-jaw chuck in the experimental group and significant differences in only grip, tip pinch, and lateral pinch in the control group. In addition, there were significant differences in the lateral pinch compared to the amount of change. CONCLUSION: Task-oriented approach using percussion instruments for upper extremity rehabilitation in stroke patients is effective in the upper extremity function and strength, hand function, and strength.

PDA 및 웹 기반의 공동주택 하자 관리 시스템의 개발

김영석,김주학,오세욱,Kim, Yeong-Seok,Kim, Ju-Hak,O, Se-Uk 한국건설관리학회 2002 한국건설관리학회 논문집 Vol.3 No.4

샤피 V - 노치 충격 하중-변위 곡선의 균열정지하중을 이용한 원자로압력용기강의 파괴인성 예측

박정용,김주학,이윤규,홍준화,Park, Jeong-Yong,Kim, Ju-Hak,Lee, Yun-Gyu,Hong, Jun-Hwa 한국재료학회 2000 한국재료학회지 Vol.10 No.4

샤피 V-노치 충격 하중-변위 곡선으로부터 얻은 균열정지하중을 이용하여 원자로압력용기강의 균열정지파괴인성($K_{Ia}$)을 예측할 수 있는 방법을 모색하고 그 타당성을 고찰하였다. 샤피충격 하중-변위 곡선으로부터 얻은 균열정지하중값의 변화는 특성온도로 보정된 지수함수의 형태로 잘 표현될 수 있었다. 특성온도 $T_{Pa=2kN}$은 실험적인 무연성천이온도($T_{NDT}$) 및 $T_{41\;J}$과 높은 상관성을 나타냈으며, 원자로압력용기강의 균열정지파괴인성을 표현하는 새로운 특성온도로 사용할 수 있을 것으로 판단되었다. 또한 균열정지하중값의 변화는 파면으로부터 측정된 안정균열길이의 변화와 매우 높은 상관성을 나타내었다. 따라서 무딘 노치를 갖는 시편에 대한 계장화샤피충격시험을 통하여 균열정지하중 및 안정균열길이를 측정하믈써 비교적 정확하게 원자로압력용기강에 대한 하한값의 파괴인성치($K_{Ia}$)를 평가하는 것이 가능한 것으로 판단되었다. Applicability of crack arrest load measured from the Charpy V-notch impact test has been investigated to predict the fracture toughness of nuclear reactor pressure vessel (RPV) steels (ASME SA508 Cl.3). The temperature dependence of the crack arrest load was well described by the type of exponential function characterized by an index temperature at which the crack arrest load is 2kN. The specific index temperature, which also well correlated with $T_{NDT}\;and\;T_{41J}$ is expected to be representative index temperature characterizing the crack arrest fracture toughness of RPV steels. Also, the crack arrest load correlated well with the stable crack length measured from the fracture surface. From the measurements of the crack arrest load and the stable crack length, the lower bound fracture toughness, $K_{Ia}$ of RPV steels could be predicted with sufficient accuracy.

소형시험편의 Master Curve 방법을 이용한 원자로 압력용기강의 파괴인성 천이특성평가

양원존,허무영,김주학,이봉상,홍준화,Yang, Won-Jon,Heo, Mu-Yeong,Kim, Ju-Hak,Lee, Bong-Sang,Hong, Jun-Hwa 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2

Fracture toughness of five different reactor pressure vessel steels was characterized in the transition temperature region by the ASTM E1921-97 standard method using Charpy-sized small specimens. T he predominant fracture mode of the tested steels was transgranular cleavage in the test conditions. A statistical analysis based on the Weibull distribution was applied to the interpretation of the scattered fracture toughness data. The size-dependence of the measured fracture toughness values was also well predicted by means of the Weibull probabilistic analysis. The measured fracture toughness transition curves followed the temperature-dependence of the ASTM master curve within the expected scatter bands. Therefore, the fracture toughness characteristics in the transition region could be described by a single parameter, so-called the reference temperature (T。), for a given steel. The determined reference temperatures of the tested materials could not be correlated with the conventional index temperatures from Charpy impact tests.

동시에 발생된 일측성 고관절, 슬관절 및 족부 관절의 외상성 골절 및 탈구 -증례 보고-

김형수 ( Hyoung Soo Kim ),김주학 ( Ju Hak Kim ),박상준 ( Sang Joon Park ),형재원 ( Jae Won Hyung ) 대한골절학회 2012 대한골절학회지 Vol.25 No.1

Although clinical cases of ipsilateral knee and hip joint dislocation have been reported, there are no reports of simultaneous ipsilateral hip, knee, and foot dislocations. We report here a case of a patient who had ipsilateral hip, knee, and foot joint dislocations, and review the relevant literature.

엘리트 구기종목 선수들의 체력 프로파일

고병구 ( Byoung Goo Ko ),김주학 ( Ju Hak Kim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2004 체육과학연구 Vol.15 No.2

본 연구의 목적은 엘리트 구기 종목 선수와 일반 대학생의 체력 및 신체적 특성을 비교하고 일반 모집단을 기준으로 한 엘리트 구기종목 선수들의 체력 및 신체적 프로파일을 작성하는 것이다. 이러한 연구목적에 도달하기 위하여 4개 구기종목 선수 113명과 49명의 일반 대학생을 대상으로 14 항목의 기초적인 체격과 체력검사를 실시하였다. 여기서 얻은 자료에 대해 일원변량분석을 이용하여 대학생과 각 종목 간 신체 및 체력 특성의 차이를 확인하였으며, 또한 표준거리분석을 이용하여 모든 연령대에서 선수 선발 및 훈련에 이용 가능한 T 프로파일을 작성하였다. 구체적인 연구결과는 다음과 같다. 첫째, 엘리트 축구 선수는 동연령대의 일반대학생에 비하여 좌고가 크며, 체지방률이 낮고 상지근력 및 지구력, 상지순발력, 복근지구력, 하지근력 및 지구력, 하지순발력, 심폐지구력, 스피드, 민첩성, 그리고 유연성이 우수한 것으로 나타났다. 특히, 좌고, 상지근력 및 지구력, 상지순발력, 복근지구력, 심폐지구력, 스피드, 민첩성, 그리고 유연성이 1표준편차 이상 높은 것으로 나타났다. 둘째, 엘리트 농구 선수는 동연령대의 일반 대학생에 비하여 신장, 좌고, 체중, 흉위가 크며, 상지순발력, 복근지구력, 하지순발력, 심폐지구력, 스피드, 민첩성이 우수한 것으로 나타났다. 특히, 신장, 좌고, 체중, 흉위, 상지순발력, 복근지구력, 심폐지구력, 스피드, 그리고 민첩성이 1표준편차 이상 높은 것으로 나타났다. 셋째, 엘리트 배구 선수는 일반 대학생에 비하여 신장, 좌고, 체중, 흉위가 크고, 상지순발력, 복근지구력, 하지순발력, 심폐지구력, 민첩성, 유연성이 우수한 것으로 나타났다. 특히, 신장, 좌고, 흉위, 상지순발력, 복근지구력, 하지순발력, 심폐지구력, 스피드, 그리고 민첩성은 1표준편차 이상 높은 것으로 나타났다. 넷째, 엘리트 야구 선수는 일반대학생에 비하여 신장, 좌고, 체중, 흉위가 크고, 상지근력 및 지구력, 상지순발력, 복근지구력, 하지순발력, 심폐지구력, 스피드, 민첩성, 유연성이 우수한 것으로 나타났다. 특히, 신장, 좌고, 체중, 상지순발력, 하지순발력, 심폐지구력, 스피드, 민첩성은 1표준편차 이상 높은 것으로 나타났다. 결론적으로 일반 대학생을 기준으로 작성된 엘리트 구기종목 선수들의 프로파일은 각 구기종목의 꿈나무 선수 발굴이나 선발에 유용한 준거로 활용될 수 있을 것이다. The purpose of this study was to compare physical characteristics between elite ball game athletes and a university students, and then make out physical profiles of elite ball game athletes. For this purpose, four physique and ten physical fitness data that obtained from 113 elite men athletes of four ball games and 49 university men students were analyzed by using One-Way ANOVA and T-Interval Profiling. T-Interval means the distance of the elite`s T-score and the university students` T-score as a general population that were calculated on the basis of the average and the standard deviation of the university students` raw scores. The results were as follows. 1. The physical characteristics of elite soccer athletes were identified by the superiority of sitting height, percent body fat, arm muscle strength & endurance, arm power, abdominal muscle endurance, leg muscle strength & endurance, leg power, aerobic capacity, speed, agility, and flexibility that distinguish them clearly. 2. The physical characteristics of elite basketball athletes were identified by the superiority of height, sitting height, weight, chest circumference, arm power, abdominal muscle endurance, leg power, aerobic capacity, speed, and agility. 3. The physical characteristics of elite volleyball athletes were identified by the superiority of height, sitting height, weight, chest circumference, arm power, abdominal muscle endurance, leg power, aerobic capacity, speed, agility, and flexibility. 4. The physical characteristics of elite baseball athletes were identified by the superiority of height, sitting height, weight, chest circumference, arm muscle strength & endurance, arm power, abdominal muscle endurance, leg power, aerobic capacity, speed, agility, and flexibility. Consequently, elite ball game athletes present physical characteristics that distinguish them from the general population. On a practical point of view, these profiles can serve as useful criteria for talent identification and selection of each ball game player.

SA 508 강 용접 열영향부의 미세조직과 충격인성의 상관관계

김상호,홍준화,김주학,권순주,이성학,강석영,오세진 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.4

In this study, microstructures of the heat affected zone (HAZ) of SA 508 steel were identified by Mo¨ssbauer spectroscopy in conjunction with microscopic observations, and were correlated with impact toughness. Specimens with the peak temperature risen up to 1350℃ showed mostly martensite, but the microstructures were not changed, much from the base metal because of the minor tempering effect when it was risen to 650℃ or 700℃. With the peak temperature risen to 900℃ over the A₃ temperature, the martensite fraction was reduced, while bainite or martensite island were formed because of the slow cooling from the lower austenite region. As the martensite fraction present inside the HAZ increased, hardness and strengths tended to increase, whereas impact toughness decreased. However, impact toughness of the subcritical HAZ with the peak temperature risen to 650℃-700℃ was seriously reduced after post-weld heat-treatment (PWHT) since carbide particles were of primary importance in initiating voids. Thus, the most important microstructural factors affecting impact toughness were the martensite fraction before PWHT and the carbide fraction after PWHT.