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- 저자 : 최석환(Seok Hwan Choi) (검색결과 62 건)
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최석환(Choi, Seok-Hwan),김하영(Kim, Ha-Young) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4
This study analyzes the elementary school violence prevention programs of previous studies to provide base material for the research and development of more effective school violence prevention programs. To achieve the research goals, This study used literary explorations and analysis was conducted on a total of 21 theses that deal with elementary school violence prevention programs among 134 Korean journal theses that appeared in searches made using the keywords of “elementary school violence prevention programs” through RISS (Research Information Sharing Service), and the results were as follows. First, elementary school violence prevention programs were shown to mainly be in the fields of counseling and physical education. Second, effectiveness elements of elementary school violence prevention programs were mainly behavioral elements such as aggression and school violence attitudes and emotional elements such as self-esteem, empathy, and confidence. Third, the subjects of elementary school violence prevention programs were mainly higher-grade students (4th, 5th, 6th grade) and the programs were mainly of small scales with 41 to 60 people and 20 to 40 people. Fourth, elementary school violence prevention programs mostly had a number of 6 to 10 sessions with most sessions being 40 minutes each. Fifth, the treatment cycles of elementary school violence prevention programs were mainly once or twice a week with treatment periods being mainly 4 to 6 weeks.
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선형 판별 분석 및 k-means 알고리즘을 이용한 적대적 공격 유형 분류 방안
최석환(Seok-Hwan Choi),김형건(Hyeong-Geon Kim),최윤호(Yoon-Ho Choi) 한국정보보호학회 2021 정보보호학회논문지 Vol.31 No.6
인공지능 기술은 우수한 성능을 기반으로 다양한 분야에 적용되고 있지만 입력 데이터에 인간이 감지할 수 없는 적대적 섭동을 추가하여 인공지능 모델의 오작동을 유도하는 적대적 예제에 취약하다. 현재까지 적대적 예제에 대응하기 위한 방법은 세 가지 범주로 분류할 수 있다. (1) 모델 재학습 방법; (2) 입력 변환 방법; (3) 적대적 예제 탐지 방법. 이러한 적대적 예제에 대응하기 위한 방법은 끊임없이 등장하고 있지만 각 적대적 공격 유형을 분류하는 연구는 미비한 실정이다. 따라서, 본 논문에서는 차원 축소와 군집화 알고리즘을 활용한 적대적 공격 유형 분류 방법을 제안한다. 구체적으로, 제안하는 방법은 적대적 예시로부터 적대적 섭동을 추출하고 선형 판별 분석(LDA)를 통해 적대적 섭동의 차원을 축소한 후에 k-means 알고리즘으로 적대적 공격 유형 분류를 수행한다. MNIST 데이터셋과 CIFAR-10 데이터셋을 대상으로 한 실험을 통해, 제안하는 기법은 5개의 적대적 공격(FGSM, BIM, PGD, DeepFool, C&W)을 효율적으로 분류할 수 있으며, 적대적 예제에 대한 정상 입력을 알 수 없는 제한적인 상황에서도 우수한 분류 성능을 나타내는 것을 확인하였다. Although Artificial Intelligence (AI) techniques have shown impressive performance in various fields, they are vulnerable to adversarial examples which induce misclassification by adding human-imperceptible perturbations to the input. Previous studies to defend the adversarial examples can be classified into three categories: (1) model retraining methods; (2) input transformation methods; and (3) adversarial examples detection methods. However, even though the defense methods against adversarial examples have constantly been proposed, there is no research to classify the type of adversarial attack. In this paper, we proposed an adversarial attack family classification method based on dimensionality reduction and clustering. Specifically, after extracting adversarial perturbation from adversarial example, we performed Linear Discriminant Analysis (LDA) to reduce the dimensionality of adversarial perturbation and performed K-means algorithm to classify the type of adversarial attack family. From the experimental results using MNIST dataset and CIFAR-10 dataset, we show that the proposed method can efficiently classify five tyeps of adversarial attack(FGSM, BIM, PGD, DeepFool, C&W). We also show that the proposed method provides good classification performance even in a situation where the legitimate input to the adversarial example is unknown.
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미세먼지 전구체(SOx) 생성에 미치는 유동층 연소로의 공정변수 영향
최석환 ( Seok-hwan Choi ),윤형선 ( Hyung-sun Yoon ),서성규 ( Seong-gyu Seo ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.2
In this study, SOx conversion rate of sulfur content in mixed anthracite was investigated, and factors affecting SOx generation due to each process parameters were analyzed. For this, first, the items necessary for process improvement were analyzed. Next, the optimum Ca/S molar ratio and the temperature in the furnace were derived. The effect of high-powder limestone on the desulfurization effect was tested. In addition, changes in the desulfurization efficiency according to the inorganic components in the coal were also tested. As a result of improving the optimum Ca/S molar ratio and the furnace temperature, the desulfurization efficiency increased from 83 % to 87 %. In the experiment using high powder limestone, the desulfurization efficiency increased from 87 % to 95.5 %. It is predicted that the SOx emissions by about 72.7 % will be reduced . It was found that the improvement effect converted to ultrafine dust emission was 64.6 %, which decreased 394 tons/year(2 units).
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최석환(Choi Seok-hwan) 국방정신전력원 2018 정신전력연구 Vol.0 No.52
오늘날 군내 집단 따돌림, 폭행, 총기강력사고, 자살 등의 병영갈등의 문제는 군의 비전투손실을 야기할 뿐만 아니라 장차 우리 사회를 책임져 나아가야 할 청년들의 사고방식이나 문화를 퇴행시키는 심각한 사회문제의 한 영역이라고 할 수 있다. 그럼에도 불구하고 병영갈등 문제는 적절한 대응이 이루어지지 못한 채 지속적 · 주기적으로 발생하고 있으며, 뉴스의 일면에 등장해 화제가 되곤 한다. 군 인성교육제도는 군에서 일어나고 있는 각종 병영갈등의 문제해결에 가장 효과적인 대안이 될 수 있다. 이에 본 연구자는 육군 훈련부사관의 인성교육 수행과정에 관한 이론적 · 실질적 연구를 수행하고자 하였다. 우선 기존 문헌분석을 통해 인성교육의 개념, 내용, 효과분석을 시도하였고, 이를 기초로 일반 인성교육과 구분되는 군인성교육의 개념과 특수성을 기술하였다. 또 인성교육에 대한 교육 제도론적 접근의 일환으로 독일, 이스라엘, 미국 등 해외 군 인성교육 사례를 분석하여 군 인성교육 방법 및 제도의 개선을 위한 시사점을 제시하였다. 나아가 본 연구는 이론적 · 학문적 분석에 그치지 아니하고 군 인성교육에 참여한 육군 훈련부사관들을 대상으로 심층면담을 실시하였고, 그 결과에 따라 몇 가지 생생한 인성교육 수행 과정 간 문제점을 발견해 볼 수 있었다. 이론적 · 실증적 연구를 종합해 본 결과 군 인성교육은 과거의 그것과는 달리 개인의 정서적 · 신체적 · 사회적 문제에 대한 심층적 변용 내지 치료를 목적으로 하는 내용이 포함되어야 함을 알 수 있었다. 또 인성의 변용 · 치료 등 전문화된 인성교육이 이루어질 수 있도록 육군 훈련부사관들의 인성교육 수행과정에 관한 역량 강화를 주장하였다. 결론적으로 육군 훈련부사관들의 인성교육 수행과정에 관한 역량 강화를 위해 다음의 몇 가지 개선방향을 제언하였다. 첫째, 군 인성교육의 개념, 목표 등 군 인성교육의 가치를 명확히 확립하여 체계적인 교육제도를 마련하여야 한다. 둘째, 육군 훈련부사관에 의한 인성교육 프로그램의 전문성 향상을 위해 노력해야 한다. 셋째, 종국적으로는 군 인성교육 교관의 전문성 강화를 위해 군 교육기관 간 협력 및 민간 전문 교육기관과의 연계를 적극적으로 활용해야 한다. Today, conflicts in the Army such as group bullying, assault, firearm accident, suicide, and etc. not only bring about non-combat loss but also marks one area of serious social problem regressing the mentality or culture of young people who have the responsibility to lead our future society. Despite its seriousness, conflict issues have not been dealt or responded appropriately, occurring continuously on a regular basis, being introduced as a topic on a newspaper from time. Military character education system can be the most effective alternative in resolving conflicts of all sorts occurring in the Army. Hence, an attempt was made to conduct a theoretical and practical study on the process of character education of the Army drill sergeant. First, the notion, contents, effect analysis of character education was made by analyzing the existing literatures. With these as the foundation, the notion of military character education and its distinctiveness, which is classified differently from general character education, was written. Also, as a part of the education systematic approach to character education, an analysis of the examples of overseas military character education such as Germany, Israel, US, and etc. was made to present suggestions for military personality education methods and systemic improvement. Furthermore, in this study, not only were the theoretical and academic analysis made but also in-depth interviews with the drill sergeants who participated in military character education, and through the results a number of problems were found during the process of the lively military character education. As a result of putting together the theoretical and practical studies, military character education need inclusion of contents with the purpose of providing in-depth transformation or therapy to cover emotional, physical, social issues of individuals. Also, it was found that an enhanced character education process is needed to strengthen the capability of drill sergeants, thus the need for the specialized character education to incorporate personality transformation, therapy, and etc. As a conclusion, the following improvement directions are suggested for strengthening the character education process of the drill sergeants. First, a clear establishment of military character education value such as its notion, concept, objective, and etc. needs to be established for a structured education system. Second, the character education program needs to be led by certain drill sergeants for specialty improvement. Third, in the end, a cooperation among military education institutes and coordination with civilian specialized education institutes are to be actively utilized.
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최석환(Choi, Seok-Hwan),김하영(Kim, Ha-Young),김석산(Kim, Suk-San) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6
This study analyzed Taekwondo Poomsae researches conducted in Korea from December, 1992 to June, 2021 in order to find trends of Taekwondo Poomsae studies. The purpose of this study will provide directions for which studies are needed more in the future. For the purpose of this study, a total of 230 research papers were selected out of 436 papers appeared by entering “Poomsae” as a keyword using the search system of RISS. The results were as follows. First, dividing by period, 4 researches (2%) were conducted in 1992-2001, 40 researches (17%) in 2002-2011, and 186 researches (81%) in 2012-2021. Second, by research field, physiology/prescription (49 researches, 21%), psychology (43 researches, 19%), sociology (37 researches, 16%), philosophy (32 researches, 14%), mechanics (14 researches, 8%), measurement evaluations (13 researches, 6%), and education and management (3 researches, 1%) respectively. Third, by study subjects, athletes accounted for nearly half of the total with 99 (43%), followed by 40 (17%) literature researches, 38 (17%) mixed method studies, 18 (8%) college students/adults, 16 (7%) under elementary school students, 8 (3%) leaders, 6 (3%) middle and high school students, and 1 (0.4%) referee. Fourth, as for the type of research, 143 (62%) quantitative researches accounted for more than half, 83 (36%) qualitative researches, and 4 (2%) mixed method studies.
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