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원주 법천사지 지광국사탑 복원부 모르타르 재료학적 특징 및 표면손상 기초 해석
채승아,조하진,이태종,Chae, Seung A,Cho, Ha Jin,Lee, Tae Jong 한국문화재보존과학회 2021 보존과학회지 Vol.37 No.5
원주 법천사지 지광국사탑은 조성시기와 대상이 명확하며, 뛰어난 장엄조각과 화려한 문양이 새겨진 고려시대를 대표하는 승탑이다. 그러나 한국전쟁 당시 폭격으로 파손되어 1957년 시멘트와 철근 등으로 수리·복원하였으며, 오랫동안 복원부 모르타르의 영향으로 원형부재 표면에 손상이 진행되고 있었다. 이러한 손상원인을 확인하기 위해 복원부 모르타르와 원형부재의 풍화산물인 표면오염물을 분석하였다. 복원부 모르타르에서는 수산화칼슘, 방해석, 에트링자이트, 이수석고를 확인하였으며, pH측정과 중성화 반응검사를 통해 모르타르는 열화가 진행 중임을 알 수 있었다. 표면오염물 분석에서도 난용성 물질인 방해석, 이수석고가 확인되었고, 현미경 관찰을 통해 조암광물 사이에서 부피 성장 중인 모습도 관찰되었다. 이러한 분석 결과를 바탕으로 표면손상 기초 해석을 위해 염 결정 형성에 큰 영향을 미치는 칼슘과 황의 함량을 P-XRF를 이용하여 반정량 분석하였으며, 모르타르의 영향을 받은 탑신석과 영향을 받지 않은 상층기 단석을 비교하여 교차 검증하였다. 그 결과 해당 원소들이 탑신석의 표면손상에 직접적으로 관여한 것으로 판단된다. The Stupa of State Preceptor Jigwang from Beopcheonsa Temple Site in Wonju (National Treasure) is a representative stupa of the Goryeo Dynasty, with outstanding Buddhist carvings and splendid patterns, clearly indicating its honoree and year of construction. However, it was destroyed by bombing during the Korean War (1950-1953) and repaired and restored with cement and reinforcing bars in 1957. The surface condition of the original stone shows long-term deterioration due to the m ortar used in past restorations. In order to identify the exact causes of deterioration, the m ortar and surface contaminants on the original stone were analyzed. Portlandite, calcite, ettringite, and gypsum from the mortar were identified, and its ongoing deterioration was observed through pH measurements and the neutralization reaction test. Analysis of surface contaminants identified calcite and gypsum, both poorly water-soluble substances, and their growth in volume among rock-forming minerals was observed by microscopy. Based on those results, semi-quantitative analysis of Ca and S contents significantly influencing the formation of salt crystals was conducted using P-XRF to analyze the basis of surface deterioration, and cross-validation was performed by comparing the body stone affected by the mortar and the upper stylobate stone unaffected by the mortar. Results indicate that the elements are directly involved in the surface deterioration of the body stone.
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채승일(Seung Il Chae),김진훈(Jin Hun Kim),이호근(Ho Kun Yi) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.53
This study reveals Unethical behavior of the sports players outside the stadium. The unethical behavior of the sports players outside the stadium can`t be stopped. Because the sports ethics education is limited to the situations in the game. In addition, sports players don`t recognize their actions outside the stadium have a great impact on the public. In this study, the necessity of social ethic education is suggested to prevent the unethical behavior of the sports players outside the stadium. Mass media and people should refrain from excessive criticizing and witch-hunt as sports players did unethical behavior. Therefore, in this study, sports players who did unethical behavior, do self-reflection to prevent them from making a bad choice and unethical conduct through proper ethics education. The goal of this study are leading sports players to ethical behavior outside of stadium through social ethics education as well as ethics education based on the sportsmanship.
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채승일(Seung Il Chae),김진훈(Jin Hun Kim),이호근(Ho Kun Lee) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.51
In modern sports, result is emphasized than process which is vi ctory-oriented, result-oriented and performance-oriented. Therefore, most sportsman are only going for the victory in the field. There are no rules or laws, and they only boost their strength to the triumph for their team. It seems that sportsmanship disappeared long time ago they are willing to infringe rules to win without a moment`s hesitation. In this study Good Foul is defined as a irregularity such as a violation of regulation and a foul play for their team. In addition, some spectators urge to do Good Foul and even to cheer players without realizing Good Foul matters. So in modern sports, those have been issues that Good Foul has been used as strategies and tactics. That is, some athletes consider Good Foul as a scapegoat for the team and this is the current status of modern sports which is trying to take advantages from fouls. As a resulting solution, th is study suggests pursue process-oriented and the need of an attitude on facing the Good Foul. Triumph is one element, not everything. Matches should be focused on process like athletes` best efforts and deep impress ion of the audiences. Good Foul is not supposed to damage essential meaning of sports and also unacceptab le act. Consequently, a severe punishment and consolidating regulations are presented as a solution to prevent making unfair profit from Good Foul.
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채승일,이동주 강원대학교 경영경제연구소 2022 Asia-Pacific Journal of Business Vol.13 No.2
Purpose - This study aims to develop machine learning models to predict administrative issue designation in KOSDAQ Market using financial data. Design/methodology/approach - Employing four classification techniques including logistic regression, support vector machine, random forest, and gradient boosting to a matched sample of five hundred and thirty-six firms over an eight-year period, the authors develop prediction models and explore the practicality of the models. Findings - The resulting four binary selection models reveal overall satisfactory classification performance in terms of various measures including AUC (area under the receiver operating characteristic curve), accuracy, F1-score, and top quartile lift, while the ensemble models (random forest and gradienct boosting) outperform the others in terms of most measures. Research implications or Originality - Although the assessment of administrative issue potential of firms is critical information to investors and financial institutions, detailed empirical investigation has lagged behind. The current research fills this gap in the literature by proposing parsimonious prediction models based on a few financial variables and validating the applicability of the models.
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채승일(Chae. Seung-Il) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.58
In sport, deliberate defeat is occurred often. It’s an unethical behavior that violates sportsmanship. Deliberate defeat is occurred by so many various reasons. Espeically, most athletes and Coaches are not aware of the problems associated with deliberate defeat as there are no precise rules and grounds. That is the reason why this study is necessary. The study try to find out the causes and reason of it through examples related with deliberate defeat. And it shows that enhance the level of punishment and education of sport ethics are the ways to reduce deliberate defeat. Moreover, if those various means could be applied to actual situation, deliberate defeat would disappear.
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