• 대한공업교육학회지
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• 제37권2호
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• pp.127-146
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• 2012

이 연구의 목적은 기술교육에서 강조되고 있는 체험활동 과제의 개발 절차를 탐색하고 기술 교과의 특성에 맞는 일반화된 개발 절차를 제시하는데 그 목적이 있다. 이 연구를 위한 연구 방법은 주로 문헌 연구에 기초하였으며 체험, 경험, 체험활동에 대한 개념 탐색, 선행 연구자들에 의해 제시된 체험활동의 개발절차를 살펴보고 공통적인 요소를 추출하였다. 연구결과 첫째, 체험과 체험활동의 개념을 살펴보고 기술교육에서 체험활동 과제개발 절차를 고찰하였다. 둘째, 기술교육에서의 체험활동 과제 개발 절차는 준비, 개발, 개선의 3단계 및 세부 단계로 제시하였다. 셋째, 체험활동 과제에 포함되어야 할 내용 구성으로 교사용 자료로 체험활동 제목명, 수업 전 읽어볼 내용, 개요, 과정별 수업 목표, 수업 과정별 주요 활동, 재료, 공구 및 시설, 설계 개요, 참고 자료, 평가표, 세부 수업과정안 등이며, 학생용 자료는 수업목표, 유의사항, 포트폴리오 등을 제시하였다.

• 대한공업교육학회지
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• 제40권2호
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• pp.175-195
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• 2015

본 연구는 중학교 기술교육에서 기술적 문제해결 체험활동을 통해 나타나는 학생들의 변화를 탐색하는 것에 목적을 두었다. 이를 위해 연구 참여자는 경기 G시의 중학교 1학년 학생 12명을 유목적적 표집법으로 선정하였고, 자료 수집을 위해 자극 회상 질문법에 의한 심층면담, 집단토론을 실시하였다. 자료 분석 방법으로는 영역 분석, 분류분석, 성분분석 방법을 활용하였고, 연구 참여자들 간 검토 및 삼각검증을 통해 연구의 진실성을 확보하였다. 연구 결과 기술 교육에서 기술적 문제해결 체험 활동 수업은 학생들에게 '기술적 제작에 대한 부담과 흥분사이', '기술적 문제해결의 실마리와 발화점', '기술적 능력을 통한 자아의 발견'의 의미를 갖는 것으로 나타났다. 구체적으로 '기술적 제작에 대한 부담과 흥분사이'는 평소 성적이 우수한 학생들은 수행평가에 대한 심리적 부담감을 많이 느꼈지만, 일반적인 '만들기'에 대한 선(先)경험과 흥미는 체험활동에 대한 흥분감을 느끼도록 하였음을 의미한다. '기술적 문제해결의 실마리와 발화점'은 생소한 체험활동 과제를 해결하는 과정에서 모둠원들과의 관계 이해 및 형성을 중요시 하게 되고, 지속적 문제 해결력을 갖도록 함을 의미한다. '기술적 능력을 통한 자아의 발견'은 체험활동 학습을 통해 스스로 '만들어가는' 학습 경험의 중요성을 깨닫게 되고, 내면의 조작적 욕구 충족의 기회가 될 수 있음을 의미한다. 이러한 결과는 향후 기술 교육에서의 기술적 문제해결 체험활동 교육을 보다 의미 있고 체계적으로 설계하는데 필요한 기초 자료로 활용될 수 있을 것으로 기대한다.

• 대한인간공학회지
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• 제32권5호
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• pp.413-420
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• 2013

Objective: The objective of this study was to compare one-hand and two-hands lowering activity in terms of biomechanical stress for the range of lowering heights from knuckle height to 10cm above floor level. Background: Even though two-hands lifting/lowering activity of manual materials handling tasks are prevalent at the industrial site, many manual materials handling tasks which require the worker to perform one-hand lifting/lowering are also very common at the industrial site and forestry and farming. Method: Eight male subjects were asked to perform lowering tasks using both a one-handed as well as a two-handed lowering technique. Trunk muscle electromyographic activity was recorded while the subjects performed the lowering tasks. This information was used as input to an EMG-assisted free-dynamic biomechanical model that predicted spinal loading in three dimensions. Results: It was shown that for the left-hand lowering tasks, the values of moment, lateral shear force, A-P shear force, and compressive force were increased by the average 6%, as the workload was increased twice from 7.5kg to 15kg. For the right-hand lowering task, these were increased by the average 17%. For the two-hands lowering tasks, these were increased by the average 14%. Conclusion: Even though the effect of workload on the biomechanical stress for both one-hand and two-hands lowering tasks is not so significant for the workload less than 15kg, it can be claimed that the biomechanical stress for one-hand lowering is greater than for two-hands lowering tasks. Therefore, it can be concluded that asymmetrical lowering posture would give greater influence on the biomechanical stress than the workload effect for one-hand lowering activity. Application: The result of this study may be used to provide guidelines of recommended safe weights for tasks involved in one-hand lowering activity.

• 대한인간공학회지
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• 제30권5호
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• pp.597-603
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• 2011

Objective: The objective of this study was to compare one-hand and two-hands lifting activity in terms of biomechanical stress for the range of lifting heights from 10cm above floor level to knuckle height. Background: Even though two-hands lifting activity of manual materials handling tasks are prevalent at the industrial site, many manual materials handling tasks which require the worker to perform one-hand lifting are also very common at the industrial site and forestry and farming. Method: Eight male subjects were asked to perform lifting tasks using both a one-handed as well as a two-handed lifting technique. Trunk muscle electromyographic activity was recorded while the subjects performed the lifting tasks. This information was used as input to an EMG-assisted free-dynamic biomechanical model that predicted spinal loading in three dimensions. Results: It was shown that for the left-hand lifting tasks, the values of moment, lateral shear force, A-P shear force, and compressive force were increased by the average 43%, as the workload was increased twice from 7.5kg to 15.0kg. For the right-hand lifting task, these were increased by the average 34%. For the two-hands lifting tasks, these were increased by the average 25%. The lateral shear forces at L5/S1 of one-hand lifting tasks, notwithstanding the half of the workload of two-hands lifting tasks, were very high in the 300~317% of the one of two-hands lifting tasks. The moments at L5/S1 of one-hand lifting tasks were 126~166% of the one of two-hands lifting tasks. Conclusion: It is concluded that the effect of workload for one-hand lifting is greater than two-hands lifting. It can also be concluded that asymmetrical effect of one-hand lifting is much greater than workload effect. Application: The results of this study can be used to provide guidelines of recommended safe weights for tasks involved in one-hand lifting activity.

• 산업경영시스템학회지
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• 제37권4호
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• pp.72-81
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• 2014

Even though two-hands lifting/lowering activity of manual materials handling tasks are prevalent at the industrial site, many manual materials handling tasks which require the worker to perform one-hand lifting/lowering are also very common at the industrial site, forestry, farming, and daily life. The objective of this study was to compare one-hand lowering activity to lifting activity in terms of biomechanical stress for the range of lowering heights from knuckle height to 10cm above floor level with two workload 7.5kg and 15.0kg. Eight male subjects with LMM were asked to perform lifting/lowering tasks using both a one-handed (left-hand and right-hand) as well as a two-handed technique. Spinal loading was estimated through an EMG-assisted free-dynamic biomechanical model. The biomechanical stress of one-hand lowering activity was shown to be 43% lower than that of one-hand lifting activity. It was claimed that the biomechanical stress for one-hand lifting/lowering activity is almost twice (194%) of the one for two-hands lifting/lowering activity. It was also found that biomechanical stress by one-hand lowering/lifting activity with the half workload of two-hands lowering/lifting activity was greater than that of the two-hands lowering/lifting activity. Therefore, it might be a risk to consider the RWL of one-hand lowering/lifting activity to simply be a half of the RWL of two-hands lowering/lifting activity recommended by NIOSH.

• 대한물리의학회지
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• 제13권1호
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• pp.1-9
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• 2018

PURPOSE: This study investigated the neurophysiological and behavioral adaptation during one or both hands movement in chronic stroke patients. METHODS: The study included sixteen hemiplegic stroke patients. Neurophysiological data (brain activation and muscle activation) were examined by electroencephalography (EEG) and electromyography (EMG), and behavioral adaptation was examined by wrist extension angle during wrist extension with one hand or both hands. Outcome variables of one hand or both hands were; mu rhythm of the EEG, EMG amplitude of wrist extensor and flexor muscles, and wrist angle of Myomotion 3D motion analysis. RESULTS: Our results revealed that wrist extension angle was significant increased during both hands movement compared to one hand movement (p<.05). Furthermore, in affected sensorimotor area, there was significant increase in the brain activation during both hands movement compared to one hand movement (p<.05). However, there was no significant different between one hand and both hands movement in muscle activation (p>.05). CONCLUSION: According to the findings of this experiment, bilateral arm movement improved brain activity on affected sensorimotor area and wrist extension angle. Therefore, we suggest that bilateral arm movement would positive effect on stroke rehabilitation in terms of increase in brain activation on affected motor area and wrist extension during bilateral arm movement.

• 대한물리의학회지
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• 제4권4호
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• pp.269-274
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• 2009

Purpose：The purpose of this study is an interval palmar width according to change of muscle activation under push-up movement. Methods：Three, this study participation normal young adult (male 3, mean age ; 24yaers). The subject performed maximum contraction under push-up movement. EMG activaty patterns is measured with three different width. The EMG activity of pectoralis major and latissimus dorsi were measured using surface electromyography. Results：EMG activation of pectoralis major and latissimus dorsi following of push-up was shown significant difference(p<.05). Also, experiment value was agree with calculation value and width of shoulder position was minimum of pectoralis major and latissimus dorsi muscle activity. Conslusion：RMS values in case of fretum and wide width of the hands on Latissimus Dorsi are shown muscle activity $132{\mu}V$ and $173.5{\mu}V$, respectively. Especialy, RMS value in terms of wide width of the hands on muscles is shown very enhanced muscle activity. It is suggest that interval palmar width of the hands on pectoralis major and latissimus dorsi in push-up movement was effective to intensify of the muscle activity.

• 한국환경보건학회지
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• 제35권4호
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• pp.278-286
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• 2009

The total of 181 students in Seoul were made up questions to analysis hand washing awareness from 2007 to 2008. And their hands were sampled to isolate Staphylococcus aureus for testing antibiotic resistance. The average of hand washing frequency was $2.8{\pm}2.6$ per day in their schools. The rates of the students washing hands before eating food, after outdoor activity and after using bathroom were 22.2%, 24.4% and 49.4%, respectively. The rate of students washing hand less than 20 seconds was 64.4%. The students of 43.3% answered that they thought they were washing hands well. The middle school students were worse than elementary and high school students were aware of the frequency, duration and activity of hand washing. The isolation rate of S. aureus on the hands was 29.4%. The isolates were resitant to ampicillin (28.6%), chloramphenicol (6.1%), erythromycin (31.0%), gentamycin (2.0%), penicillin (79.6%) and tetracycline (6.1%) of 17 antibiotics tested. They were all sensitive to oxacillin and vancomycin.

• 대한공업교육학회지
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• 제39권1호
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• pp.66-84
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• 2014

이 연구는 중학교 제조기술과 자동화 단원을 위한 STEAM 체험활동 과제를 개발 하는데 있다. 이 연구는 준비, 개발, 개선 단계에 따라 진행되었다. 준비단계에서는 STEAM 체험 활동의 필요성에 대한 요구분석과 준비 단계로서 체험활동 목표를 설정하였다. 개발단계에서는 체험활동 과제를 선정하고 적절한 수업 모형을 이용하여 최종 과 제를 개발하였다. 개선단계에서는 개발된 체험 활동 과제에 대하여 전문가 집단의 타당도 검사와 중 학생을 대상으로 예비시험과 현장시험을 통해 수정 보완하였다. 개발된 STEAM 체험 활동은 스마트폰용 접사&망원경 KIT, 목제품을 이용한 판화 만들기이며, 각 체험 활동의 구성은 설계 개요, 재료, 평가 기준, 수업과정안, 포트폴리오 등으로 구성하였다. 이상의 연구 결과를 바탕으로 개발된 STEAM 체험활동 과제가 중학교 제조기술 단원의 실습은 물론 방과후학교, 발명반, 과학교실, 창의적 체험활동, 동아리 활동 등 에서 널리 활용하기를 바란다.

• 치위생과학회지
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• 제23권2호
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• pp.132-141
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• 2023

Background: The purpose of this study was to identify the connection between handwashing and toothbrushing, focusing on eating habits, and to verify whether eating habits can be used as an action cue for forming health habits. Methods: This was a cross-sectional study using secondary data from the 2019 community health survey. The participants included 229,099 adults aged 19 years or older, representative of the South Korean people. We employed two dependent variables: one was washing hands, and the other was brushing teeth. Eating habits was a major independent variable. Socioeconomic variables, such as age, gender, income, occupation, economic activity, education, and residence were adjusted as confounders. Multivariate logistic regression was performed to calculate adjusted odds ratio and 95% confidence intervals. Results: Most of the participants had good health behaviors: those who wash their hands and brush their teeth were each approximately 80%. Our finding indicated that brushing teeth and washing hands can be connected with eating habits. After adjusting for confounders, it was found that people who wash their hands before meals (compared to those who did not wash their hands before meals) had a higher toothbrushing rate after meals (i.e., socioeconomic status) (Adjusted Odds Ratio: 2.0, Confidence Intervals: 1.9 to 2.1). Conclusion: Those who practice either washing hands before meals or brushing teeth after meals were found to have a connection between washing hands and brushing teeth based on the results of practicing other health behaviors. This implies that eating habits can be connected as a behavior cue to promote health habits, such as washing hands before meals and brushing teeth after meals.