• 한국운동역학회지
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• 제18권2호
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• pp.105-114
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• 2008

본 연구는 고교여자역도 선수들의 용상동작에서 무게증가에 따른 근전도의 변화를 분석하여 체급별(69kg급, 58kg급)로 나타나는 근 발현양상을 비교하였다. 주동근은 대퇴이두근, 승모근, 척추기립근, 광배근, 비복근, 외측광근 등 6개의 근육을 선정하였으며, 용상동작을 6구간으로 나누어 근전도를 측정하여 다음과 같은 결과를 보였다. 체급별 차이에서 58kg급에서는 모근 근육군과 동작구간에서 무게가 올라갈수록 근육의 발현이 단계적으로 올라가는 양상을 보였다. 체급에 따른 EMG 신호크기에서는 각 근육군마다 그 크기가 서로 다르게 나타나, EMG 신호크기가 체급과 무게에 따라 증가되는 것은 아닌 것으로 나타났다. 본 연구결과로 볼 때 69kg급에서 무게에 따른 근발현이 일관성 없이 나타나는 것으로 미루어 높은 체급일수록 근력과 함께 기술적인 요인도 고려되어야 경기력 향상에 긍정적인 영향을 미칠 것으로 사료된다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집(한일합동학술편); 한국과학기술대학, 충남; 16-17 Oct. 1987
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• pp.812-816
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• 1987

A quadratic regulator problem for a class of nonlinear system, in which a small parameter multiplies the control cost, is considered. In the analysis of the problem, we utilize the method of multiple time-scale decomposition which has been devised for analyzing complex linear cheap control problems. In so doing, we extend the class of nonlinear systems, considerably, for which the minimum cost becomes zero as the small parameter goes to zero.

• 한국해양생명과학회지
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• 제9권1호
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• pp.41-46
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• 2024

This study aimed to reconfirm the sex change scale and pattern of Tegillarca granosa. Although the sex ratio (female : male, female proportion) of T. granosa was 1:2.32 (30.2%) at the initial stage (2011) of the study, it was 1:0.94 (51.5%) after one year (2012) in the same population. The increase of the female proportion was greater in the 2+ year class (23.0%) when compared to the 1+ year class (19.2%). Overall, sex change ratio of 37.6% was observed in this population of T. granosa. The sex change ratio of the 2+ year class (39.3%) was higher than that of the 1+ year class (35.3%). And sex change ratio in the males (42.2%) was higher than that in the females (26.9%). The female proportion was the opposite of the result from 2006~2007, and one of the causes was presumed to be the difference in cumulative water temperature during the gonadal inactive stage (winter).

• 대한장애인치과학회지
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• 제10권1호
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• pp.1-8
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• 2014

Patients with disabilities are a significant segment of Korea population. However, they encounter more challenges when seeking dental care. So, dentists and students who are future dental providers should have a responsibility to provide oral care services for them. In this study, we hypothesize that the education of special care dentistry may influence positive attitudes of the disabled. The attitudes are influenced by demographic variables such as gender, religion, experience of volunteer activities and marital status. Therefore, the objective of this study was to explore the change of attitudes of students towards people with disabilities between before and after class of special care dentistry. 72 students enrolled at the Kyung Hee University were surveyed. All participants attended class of Special Care dentistry in the third grade. The survey was conducted two times, just before class and after class. The attitudes of students were assessed using the well-documented ATDP (Attitude Toward Disabled Person)-O(Original) scale and MAS (Multidimensional Attitudes Scales Toward Persons with Disabilities) scale through the methodology of questionnaires. The results indicated that gender, experience of volunteer activities and marital status did not affect their ATDP and MAS score. In religious affiliation, only, there were statistically significant difference in student attitudes between before and after class of Special care dentistry. It means that habitual religious activity may offer stronger effects on student's attitude than short-term education. Therefore, long-term and specific educational experiences are needed to promote positive attitudes for people with disability.

• 초등상담연구
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• 제9권1호
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• pp.133-142
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• 2010

본 연구의 목적은 격려중심 학급운영이 초등학생의 학교생활적응과 자기격려에 미치는 효과를 탐색하는 것이다. 이를 위해 다양한 격려중심학급운영방안이 아들러의 개인심리학 이론에 기초하여 개발되었다. 연구대상은 광주광역시 A 초등학교 5학년 2개반이며, 한 반은 실험집단(n=28), 다른 한 반은 통제집단(n=31)이었다. 자료는 학교적응검사(강해련, 2008)와 자기격려척도(기채영, 홍경자, 2008)를 통해 수집하였다. 수집된 자료는 공분산분석을 하였다. 연구결과는 다음과 같다. 첫째, 통제집단보다 실험집단에서 학교적응점수가 유의미하게 증진하였다. 둘째, 통제집단보다 실험집단에서 지기격려점수가 유의미하게 증가하였다.

• 교육시설 논문지
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• 제20권6호
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• pp.21-30
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• 2013

This study aimed to identify elementary school teachers' perceptions of various aspects of physical environments of a classroom. For the purpose, a survey questionnaire was administered to 982 classroom teachers(female 82.2%) working at 67 elementary schools(Seoul 55%) located in Seoul and Busan. According to the analyses of the survey data, 50.8% of the respondent teachers suggested 20-25 as an optimum class size. Also, 57% of the teachers were positive about the current size of a classroom($67.5m^2$), but evaluations of a classroom size were divided between the teachers who had more and less than 30 students in class. Furthermore, three factors, labelled as 'uniqueness', 'residential stability' and 'visually pleasing', were extracted from a factor analysis of the Semantic Differential Scale consisting of 24 adjectives evaluating a classroom environment. Teachers from Busan tended to rate higher in the uniqueness domain while female teachers scored higher in the domain of residential stability, respectively, compared to their counterparts. Overall, the teachers perceived their classrooms having no particular characteristics, but rated highly in terms of stability. In addition, it was found out that the teachers' requests for the improvement of a classroom environment were not so much as the increased size of a classroom as a reduced class size as well as educational facilities that are corresponding to a variety of instructional methods. In summary, this study confirmed that elementary school teachers' perceptions of a classroom environment varied according to such factors as sex, teaching career, grade of their concerned class, and class size.

• 한국체육학회지인문사회과학편
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• 제51권5호
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• pp.229-241
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• 2012

본 연구는 체육수업에 참여하는 학생들을 대상으로 학습자들이 지각하는 체육수업의 상황적 구조를 분석하기 위해 개발된 행동활성화와 행동억제척도(최헌혁, 허진영, 2010)를 재검증하고, 이것이 자기결정성동기에 어떠한 영향을 미치는지 알아보는 것이다. 서울과 경기도소재 고등학생 658명을 연구대상자로 선정하였으며, SPSS 18.0과 AMOS 16.0 프로그램을 이용하여 기술통계, 상관관계분석, 탐색적 요인분석, 다중회귀분석과 확인적 요인분석을 실시하였다. 구조방정식모형 분석결과 첫째, 행동활성화의 하위요인인 친구관계, 교사행동, 정서전환, 긍정적수업태도가 높을 수록 자기결정적인 것으로 나타났다. 둘째, 행동억제의 하위요인인 획일적수업구조, 부정적교사태도, 처벌, 유능감부족은 낮을수록 자기결정적인 것으로 나타났다. 아울러 행동활성화와 억제요인이 앞으로 체육수업 수업상황과 관련된 연구를 진행하는데 있어 유용하게 적용될 수 있는 실제적인 적용연구의 가능성에 관해 논의하였다.

• Journal of Information Processing Systems
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• 제16권5호
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• pp.1083-1094
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• 2020

Recognizing plant species based on leaf images is challenging because of the large inter-class variation and inter-class similarities among different plant species. The effective extraction of leaf descriptors constitutes the most important problem in plant leaf recognition. In this paper, a multi-scale angular description method is proposed for fast and accurate leaf recognition and retrieval tasks. The proposed method uses a novel scale-generation rule to develop an angular description of leaf contours. It is parameter-free and can capture leaf features from coarse to fine at multiple scales. A fast Fourier transform is used to make the descriptor compact and is effective in matching samples. Both support vector machine and k-nearest neighbors are used to classify leaves. Leaf recognition and retrieval experiments were conducted on three challenging datasets, namely Swedish leaf, Flavia leaf, and ImageCLEF2012 leaf. The results are evaluated with the widely used standard metrics and compared with several state-of-the-art methods. The results and comparisons show that the proposed method not only requires a low computational time, but also achieves good recognition and retrieval accuracies on challenging datasets.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.5-9
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• 2010

본 논문에서는 75톤급 액체로켓엔진 1/2.5-scale 연소기의 연소시험에서 얻어진 동적특성 결과에 대해 기술하였다. 엔진 시동 구간 및 연소실 압력에 따른 동적특성 변화를 살펴보기 위해 연소실 압력 30 bar와 60 bar 상태에서 연소시험이 수행되었으며 이에 따른 연소기의 연소안정성을 검토하였다.

• 대한조선학회논문집
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• 제46권2호
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• pp.127-135
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• 2009

The performance of the waterjet system of 180 ton class fishing guard ship has been experimentally studied. A waterjet propulsion system has many advantages in comparison with a conventional screw propeller especially for high speed craft because of its good cavitation performance. Recently waterjet system has been applied to fishing boats and fishing guard ship because of avoiding a net problem although their speeds are not so high. This paper describes experimental procedure and analysis method of resistance and self-propulsion tests with a 1/14.46-scale model. Experimental results were analyzed according to ITTC 96 standard method. The full-scale effective power and delivered power of the ship were also analyzed and the full-scale speed predicted from the model test results shows a good agreement with the full-scale result from the sea trial tests.