• 한국산학기술학회논문지
• /
• 제20권12호
• /
• pp.224-229
• /
• 2019

본 연구는 고등학교 야구선수를 대상으로 신체정렬과 족저압 분포 분석하여 올바른 자세지도와 스포츠 손상 및 부상 예방 프로그램에 참고 자료를 제공하는데 그 목적이 있다. 연구 대상자 32명을 대상으로 실시하였다. 신체정렬은 척추에서 몸통의 좌우기울기, 등뼈의 뒤굽음각, 허리뼈의 앞굽음각, 골반에서는 골반의 기울기, 골반의 뒤틀림을 측정하였고 족저압은 각 발의 좌우 체중분포, 각 발의 최대압력을 측정하였다. 측정항목에 대한 평균과 표준편차를 산출하여 도표화하였고, 신체정렬과 족저압 분포의 상관관계를 알아보기 위해 pearson's cerrelation analysis를 사용하여 분석하였다. 모든 통계학적 유의 수준은 0.05로 설정하였다. 신체정렬과 족저압 분포 간의 상관관계를 분석한 결과 척추에서 허리뼈의 앞굽음각과 좌우 최대압력에서 양의 상관관계가 나타났다. 몸통의 좌우기울기, 등뼈의 뒤굽음각, 골반의 기울기, 골반의 뒤틀림과 각 발의 좌우 체중분포, 각 발의 최대압력에서는 상관관계가 나타나지 않았다. 본 연구를 통해 허리뼈의 앞굽음각이 증가될수록 발의 한쪽에 힘이 더 실리게 되어 최대압력이 증가하는 양의 상관관계를 나타내는 것을 알 수 있었다. 향후 운동선수들의 신체정렬과 족저압 분포에 대한 운동프로그램의 참고 자료가 될 것으로 사료된다.

• 한국운동역학회지
• /
• 제17권4호
• /
• pp.201-208
• /
• 2007

The purpose of this study is to compare 4 different body punch types(type 1: a punch using a shoulder, type 2: a punch using a waist, type 3: a punch using lower extremities, and type 4: a punch with elbows by your side at chest level) in horseback-riding stance and establish suitable teaching theory and method, which would be a useful reference to Taekwondo instructors on the spot(in Taekwondo dojangs all around Korea). Five exhibition players from Korean national Taekwondo exhibition team participated in this study. Each participant was asked to perform the four different types of punches and their kinematic and kinetic data were recorded with 7 vicon cameras(125Hz) and two force plates(AMTI, 1200Hz). We analyzed displacement, time, resultant center of body mass trajectory, velocity, trunk angular velocity, and ground reaction force(GRF) from each body segment in body punch and the result. I performed 1-way ANOVA(RM) for average values of each player after standardization and statistical significance was set as p<.05. was as the following ; First, they showed a tendency to take the body punch posture with the biggest motion at a shoulder and on descending order a waist and a knee. Second, a mean time for each body punch on ascending order 0.46sec. for type 2, 0.49sec for type 3, 0.50sec. for type 4, and 0.56sec. for type 1. Third, a mean resultant center of body mass trajectory for each body punch the longest 4.07cm for type 3 and the shortest 2.458cm for type 1. Fourth, a mean of maximal velocity of a fist strike was the fastest 5.99m/s for type 3, 5.93m/s for type 4, 5.67m/s for type 2, and 5.01m/s for type 1 on the descending order. Fifth, a mean of maximal trunk angular velocity of the fastest 495.6deg./sec. for type 4 and 337.7deg./sec. for type 1 on the descending order. Sixth, strongest value was type 3, 2 for anterior-posterior ground reaction force(left -54.89N, right 60.58N), type 4 for medial-lateral GRF(left 83.59N, right -80.12N), and type 3 for vertical GRF(left 341.79N, right 426.11N).

• Journal of Preventive Medicine and Public Health
• /
• 제26권1호
• /
• pp.20-36
• /
• 1993

Work-related low back pain is one of the major factors that cause the loss of working power especially in actively working age, therefore controlling the work-related low back pain is one of the major issues in the field of industrial safety and health. This study was performed for detecting the risk factors and proposing the efficient control program of the work-related low back pain. The subjects were male workers employed at the manufacturing industry in Pusan with longer than 6 months' working duration. The data was collected by self-reported questionnaire and interview from May 1 to October 31,1992. The contents of questionnaire were as follows:. the experience of low back pain within the recent one month, general characteristics(age, marital status, education level, religion, regular exercise), physical characteristics(height, weight), employment status(working duration, daily working hours, rest during work, satis(action fur the job), type of work and working environments(posture, forward bending, lifting and movement, satisfaction for table and chair). The result was analyzed for 608 entire respondents by case-control comparative method. The number of cases was 152 with a history of work-related low back pain, so the relative frequency of self-reported work-related low back pain was 25.0%, and the number of controls was 344 without any history of low back pain. As a result, two characteristics of the employment status(working duration, satisfaction fur the job) and all characteristics of type of work and working environments showed a statistical significance between the case and control groups(p<0.01). The Oddb ratios of these variables for Work-related low back pain were calculated. They were 7.88 for the satisfaction fur chair, 7.86 for lifting and movement,3.31 for satisfaction for table, and 2.22 fur bending forward(p<0.01). And for the multivariate logistic regression analysis confirmed that unsatisfaction for table was independent risk factor for Work-related low back pain. In summary, though this study was based upon the self-reported questionnaire and the subjective complaints, the satisfaction for chair, lifting and movement, satisfaction for table, and bending forward concerned with the type of work and working environments were considered as the main factors causing the work-related low back pain, and the work-related low back pain may be preventable by the ergonomic control of these factors.

• 대한통합의학회지
• /
• 제8권3호
• /
• pp.33-41
• /
• 2020

Purpose : Conventional Balance Measurement can only measure the center of gravity and the shaking movement of the body. As a result, it has the disadvantages of not responding to visual changes and blocking functions of variables. This study was carried out to evaluate the performance of new equipment that measures the balance of the body using changes in body segment and pressure using the acceleration sensor to compensate for the disadvantages of the existing equipment. Methods : To this end, balance ability was measured in 43 healthy male/female adults without orthopedic injuries and nervous system damage in the last 6 months. in a situation where the visual information was restricted by Virtual Reality (VR) gear, all subjects measured and evaluated the balance ability utilizing the new equipment. Balance measurement (Prime Medilab, Korea) and Wii fit (Nintendo, Japan) were used to measure the balance ability of the subjects, and the balance ability test was performed in 4 postures using each device for data acquisition. The test duration for each posture was 30 seconds. For data acquisition, the average value of three experiments measured using each equipment was analyzed, and the statistical test was performed using the independent sample and the corresponding sample t-test, and the significance level was set to α=.05. Results : As a result of measuring the balance ability using individual equipment, blocking visual information using VR gear, the average speed, maximum speed, and moving area of the COP increased equally. It was found that the obtained absolute size of the result in Wii was somewhat larger than that of BM. Conclusion : It is considered that in the future research, it is necessary to measure changes in the body's center of gravity through image analysis, etc., to make clear comparison and evaluation of the usability.

• 한국콘텐츠학회논문지
• /
• 제16권12호
• /
• pp.132-142
• /
• 2016

미취학아동의 시력검진실태와 시력저하 관련요인을 확인하기 위해 2015년 8월부터 2016년 1월까지 어린이집 및 유치원에 다니는 5세~7세의 아동 172명과 그 부모 중 1인 172명을 대상으로, 보호자에게는 설문조사를, 아동에게는 시력측정을 실시하였다. 시력검진 실태는 평균, 표준편차, 백분율 등 서술적 방법으로 분석하였고, 시력저하 관련요인은 로지스틱 회귀분석으로 확인하였다. 전체 아동 172명 중 128명 (74.4%)이 시력검진 경험이 있었으며, 77명(44.8%)이 시력저하로 나타났다. 7세 이후에 시력검진을 처음 수행한 경우(OR=7.43, CI=2.84-19.39), 눈 이상 증상이 있는 경우(OR=3.08, CI=1.20-7.91), 아동연령이 어릴수록(OR=10.34, CI=3.25-32.85) 시력저하 경향이 높았고, 단말기를 주로 아래에서 위로 올려다보는 아동인 경우(OR=.08, CI=.02-.26), 시력저하 경향이 낮았다. 미취학아동의 시력저하에는 유전적인 요소도 중요하지만, 눈 이상 증상, 눈검사 시기, 단말기 사용방법, 아동의 연령과 관련성이 있었다. 그러므로 아동 양육기관과 보호자, 검진기관을 대상으로 아동의 눈 이상증상과 단말기 사용방법, 눈검사 시기에 대한 교육이 필요하며, 아동을 대상으로 한 시력저하예방을 위한 중재프로그램의 개발과 효과검증이 필요하다.

• 한국교육논총
• /
• 제40권3호
• /
• pp.67-84
• /
• 2019

본 연구는 건강한 20대 남자 대학생 30명을 대상으로 플랭크운동과 탄력밴드에 의한 엉덩관절모음운동이 보행에 어떤 영향을 미치는지를 알아보고자 하는 것이다. 연구방법은 플랭크운동집단 10명, 양쪽 엉덩관절모음-플랭크운동군 10명, 한쪽 엉덩관절모음-플랭크운동군 10명을 30분씩, 주 3회, 총 6주로 진행하였다. 그 결과 분속수의 변화와 왼쪽다리의 한걸음길이, 오른쪽다리의 한걸음길이, 오른쪽 다리의 한걸음시간이 시기와 집단 간 상호작용에서 유의한 차이가 있었다(p<0.05). 본 연구의 결론은 양쪽 엉덩관절의 모음에 대한 저항 운동이 일반적 플랭크운동과 한쪽 엉덩관절 모음보다 몸통의 자세불안정성을 더욱 증가시켜 보행 능력을 향상시키는 것으로 차후의 자세불안정성을 증대하는 다양한 운동프로그램 개발이 보행능력의 향상에 도움이 될 것으로 기대해본다.

• 대한인간공학회지
• /
• 제26권3호
• /
• pp.91-100
• /
• 2007

The purposes of this research are to survey work-related risk factors of musculoskeletal disorders(MSDs) in various departments and tasks at general hospitals in non-manufacturing sectors, and to use basic data derived from the survey results in preventing work-related MSDs in hospital workers. Investigation started in March of 2006 and continued for 6 months in 220 general hospitals at Seoul, Incheon, Kyeongi, and Kangwon area. Investigators visited and interviewed workers in hospitals to identify the presence of tasks of musculoskeletal burden, the investigation results of ergonomic risk factors required by the Occupational Safety and Health Law, statistical analysis from questionnaire for musculoskeletal symptoms, and major departments and tasks that have such risk factors. Twenty-seven percents of hospitals finished the investigation of ergonomic risk factors, and 69% did not do the investigation while remained 4% did not have such factors in their hospitals. The rank order of major departments that had such musculoskeletal burdens was kitchen rooms of 143, managing departments/computer rooms/dispensaries of 137, physical treatment rooms of 109, nursing departments of 96, radiological and clinical laboratories of 63. Eighteen hospitals that did not hold legal duties by the section 148 of labor minister decree practiced prevention programs of MSDs according to the labor-management cooperation. Nursing departments ranked in the first place for the numbers of musculoskeletal symptoms of 438. Managing departments/computer rooms/dispensaries, kitchen rooms, and medical treatment departments held 127, 52 and 45 symptoms, respectively. The magnitude order of physical symptom areas followed shoulder of 185, backs and waist of 166, hand wrists of 120, necks of 110, and legs/feet of 106. The departments and jobs that had major work-related ergonomic risks were patient transporting, central supplying, patient nursing (moving patients into wheel-chairs, changing of patient posture and sheet alteration), manual transporting, operation, and managing/computer departments.

• 대한가정학회지
• /
• 제20권4호
• /
• pp.155-168
• /
• 1982

What is attempted here is to find out an optimum method for the design of physical environments that could save human energy expenditures and safely perform household duties. There are, if any, very little amount of research done in this area. This is particulary so when the work relates to the designing of household storage facilities in the light of the energy metabolism of human body. The first step to this study, therefore, is to find out the ways by which we can determine the energy metabolism of human body accurately. To measure the volume and the concentration of human respiration continuously and automatically, a new apparatus is selected here. This includes the recording system with the Wright Respirometer and the Expired Gas Analyzer as well as the computer system to multiply volume by concentration of human respiration and to integrate them for a given time. Then, the author experimented on the reliability of this apparatus and came to the conclusion that this apparatus satisfied our need to research the energy metabolism of human body. Next, the general plan and procedures to experiment with this apparatus have been determined as follows: 1) subjects are three young and sound females. Their physical characteristics are shown in Table 1 and most approximates the standard characteristics of Japanese females, 2) height of open shelves is selected in such away as to correspond to the respective height of each subject(see Table 2), 3) utensils to be stored are box shaped object, which weight is 0.5kg, 1.0kg, 2.0kg or 3.0kg, 4) working motions are given while one or two hands as to place utensil on each shelf from the standard working board, 85 cm in height and then to place back it on the board from the shelf and repeated in constant velocity as 10 times per a minute, 5) each posture of motion is chosen by each subject in free, 6) procedures of measurement of human energy metabolism ard shown at(6), 1, Section 3 as specific methods for using this apparatus. Findings of this study are as follows: 1. Human energy expenditures for storing utensils on shelves by each subject are shown in quantity more accurately than in any other studies, under varying conditions about height of shelves, load of utensils and working motion with one hand and two hands (see Fig. 8~13 and Table 3). 2. Experimental formulae of human energy expenditure for that work are shown as formula (8), (9) and (10), to generalize results of 1. and to apply those for working motion under given conditions. 3. As results of analysis on gained data, we are able to show the standard model of human energy expenditures for storing untensils on shelves by the standard Japanese female (see Table 7 and Fig. 14).

• 한국항해항만학회지
• /
• 제37권6호
• /
• pp.575-580
• /
• 2013

IMU(Inertial Measurement Unit)는 선박, 잠수함, 항공기 및 군용장비 응용분야에서 적용되어 자세 측정 영역에 주로 사용되고 있지만, 이런 IMU는 고가의 장비이기 때문에 특수 분야에서만 한정적으로 이용되어 왔다. 그러나 MEMS AHRS(MEMS : Micro Electro Mechanical System, AHRS : Attitude and Heading Reference System)의 현 기술 상황은 지능형 MEMS AHRS가 채택된 응용분야에서 가격이 높은 IMU를 대체 할 수 있는 수준에 이르고 있다. 본 논문에서는 자이로 센서, 가속도 센서, 지자기 센서를 사용한 AHRS를 이용하여 선박의 주요 운동 요소인 횡동요, 종동요, 선수동요 값을 측정할 수 있는 무선 선체 운동 측정 시스템을 개발하였다. 또한 AHRS 센서가 발생시키는 오차인 순간 가속도, 지자기의 영향 및 진동에 대응하기 위하여 칼만 필터링 기능이 탑재된 센서를 적용함으로서 최적의 성능을 실현하고자 하였다. 본 연구에서 구현한 AHRS 센서를 이용한 무선 선체 운동 측정 시스템을 이용하여 실선 실험을 실행하였으며, 선박의 제한적인 설치 상황에서도 편리하게 적용할 수 있을 것으로 보여진다. 향후 이 시스템이 선박에서 INS(Integrated Navigation System) 및 VDR(Voyage Data Recorder)과 같은 선박 장비와 호환되어 활용될 경우 항해 안전과 해양사고 분석에 유용하게 사용될 수 있을 것으로 판단된다.

• 한국운동역학회지
• /
• 제15권3호
• /
• pp.21-30
• /
• 2005

The purpose of this study is helps to make full use for perfect performance by grasping the defects of Tichonkich motion performed by athlete CSM For this, the study analyzed kinematical variables through Tichonkich motions performed at the first selection competition(1st trial) and final selection competition(2nd trial) for the dispatch to the 28th Athens Olympic Games using the three-dimensional cinematographical method with a high-speed video camera, and obtained the following results. 1. During Tichonkich motion, the execution time of up swing and the right hand moving to the left bar was shorter in the 2nd trial than the 1st one, while the execution time of down swing, the support of the left bar and the right hand moving to the right bar was longer in the 2nd trial than the 1st trial. 2. The horizontal position of COG in the 2nd trial was -35cm in the 1st stage, 42cm in the 3rd stage and 29cm in the 4th stage, that is, it showed a great swing focused on the circular movement compared to the 1st trial, while the vertical position of COG was -59cm in the 2nd stage, that is, it showed a small swing focused on a up and down movement. Also the 5th stage vertical position was 98cm, and the 6th stage vertical position was 95cm in the 2nd trial which were higher than those of the 1st trial, so it has provided magnificence required in the modern gymnastics. 3. And it was indicated that the horizontal velocity at the down swing phase proceeded forward more rapidly in the 2nd trial than that in the 1st trial, and the reverse ascent made a rapid vertical rise lessening left and right velocity change. And in the 5th stage, the 2nd trial was kept very slower in horizontal, vertical and left and right velocity that in the 1st trial, so it reached a handstand with leisurely movement. 4. In the 2nd trial, shoulder joint of the 1st, 2nd, 3rd stages kept a larger angle than that in the 1st trial, that is, it made a great swing while in the 1st trial, it showed a swing movement dependent on kick movement by the flexion and extension of hip joint. Also in the 2nd trial, the body formed a vertical posture with both hands supporting the left bar and hip joint was kept larger as $198^{\circ}$ and $190^{\circ}$ in the 5th and 6th stage than that in the 1st trial, so it made a handstand with the body uprightly stretched out, and magnificent and stable movement.