안전관리 사례 : 발파 공사를 중심으로

최천일,Choi, Chun-Il 한국건축시공학회 2004 한국건축시공학회지 Vol.4 No.2

이온크로마토그래피를 이용한 토양 중 퍼클로레이트 정량에 관한 국제표준(안) 연구

최천일,이군택,박민기,정문주,김지양,강지영,류지영,Choi, Cheon-il,Lee, Goon-taek,Park, Min-ki,Jeong, Moon-ju,Kim, Ji-yang,Kang, Ji-young,Ryu, Ji-young 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.6

Based on the literature study for the determination of perchlorate in soil we chose the ion chromatography as a measurement method and decided to use 70 mM KOH as an eluent to avoid the interference derived from the co-elution of pyrophosphate (P₂O₇⁴⁻), tripolyphosphate (P₃O₁₀⁵⁻). Also we proposed to use air dried soil through 0.15 mm sieve and distilled water as an extractant. Under the these basic concepts, we carried out the experiments to set up the detail procedure like solid to liquid ratio (S/L ratio), extraction time, device for extraction and indicating factors for quality control (e.g. precision, accuracy, MDL, LOQ). In case of time and device for extraction, 5 hours of mechanical shaking or 1 hour of centrifugation showed better precision and accuracy than that of sonication for 1 hour According to these results, we proposed the extraction method combining 5 hours of mechanical shaking with 1 hour of centrifugation. From the aspect of S/L ratio, the ratio of 1/2 or 1/3 showed resonable precision and accuracy. In case of the ratio of 1/2, there would be some problems in the separation process when the proportion of fine particle is high. Therefore, we proposed the extraction ratio of solid to liquid as 1/3 instead of 1/2. With the consideration of cost effectiveness and soil salinity, we proposed the use of cartridge for removing the interfering anions like chloride, sulfate and carbonate in specific sample such as saline soil.

FAA Level 7급 경비행기 모의비행훈련장치의 개발

윤석준(Sugjoon Yoon),김주일(Juil Kim),최천일(Chunil Choi) 한국항공우주학회 1999 韓國航空宇宙學會誌 Vol.27 No.2

비콘을 활용한 비접촉식 버스 결제시스템 설계

김병철(BYOUNG CHUL KIM),박현정(HYEON JEONG PARK),최천일(CHEON IL CHOI),변용민(YOUNG MIN BYUN),황인정(IN JEONG HWANG),주홍택(HONG TAEK JOO) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12

태권도선수들이 지각한 지도자의 리더십과 자기관리 및 운동지속의사의 관계

최천(Choi-Chun),송은일(Song, Eun-Il) 한국무예학회 2022 무예연구 Vol.16 No.1

태권도의 사회적 공유가치

최천(Chun Choi) 한국무예학회 2013 무예연구 Vol.7 No.2

본 연구는 태권도의 사회적 가치를 탐색하여 사회 공유를 모색하는데 본 연구의 목적이 있으며 이를 노인, 여성, 장애인, 청소년으로 사회의 배려 계층의 4가지 부 분으로 나누어 볼 수 있다. 첫째, 노인 태권도 수련을 통해 노인들은 기억력을 유지 할 수 있으며, 우울증 예방과 콜레스테롤 저하, 각 관절의 적절한 사용을 통해 관절염 예방 등의 효과를 가져 올 수 있다. 무엇보다도 태권도수련이 여러 가지의 긴장을 해소시키고 기분전환을 할 수 있으며 결단력, 경쟁심, 공정심, 극기심, 단결력, 도전의식, 사명감, 성취감, 소속감, 스트레스 해소, 심리적 안정, 양보심, 의지력, 인내심, 자기 존중감, 자제력, 정신수련, 정의감, 정직함, 친화력, 등에 도움을 준다. 둘째, 여성태권도는 현대 사회의 여성 대상으로 한 범죄에서 자기 자신을 지키는 호신으로써 태권도를 수련할 수 있으며, 미용 즉 다이어트의 목적으로 수련이 용이 하다. 뿐만 아니라 체력단련 및 건강을 증진시켜 줄 수 있다. 셋째, 장애인 태권도는 일반적인 장애인 체육에서의 재활목적보다는 사회통합과 정서적 안정감에 더 건전한 여가활동의 기회를 제공함으로써 미래사회에 대한 삶의 긍정적 사고의식을 배양하며, 장애인들의 사회복지에 대한 만족감을 유도할 수 있다는 중요한 역할을 하게 된다. 넷째, 청소년 태권도는 수련과정을 통해서 사회생활을 원만히 할 수 있는 사회성을 키우고, 인간 교육을 형성하는데 있다. 따라서 범죄의 예방은 물론 건강문제도 함께 해결해 주고, 아울러 여가선용에도 이바지하게 된다. The purpose of this study was to explore consideration of the four parts can be divided into the social sharing, and as the elderly, women, the disabled, youth social hierarchy. First, the elderly taekwondo training can maintain memory, and elderly people can bring depression prevention and cholesterol-lowering, through the proper use of each joint, including the effects of preventive arthritis. Above all, determination, and Taekwondo training and diversion to relieve the tension of several competitive, fair-core patience, cohesion, challenging, commitment, a sense of accomplishment, a sense of belonging, stress relief, and psychological stability, yield willpower, patience, mental discipline, self-control, self-esteem, a sense of justice, honesty, affinity, etc. helps. Second, the target of women in modern society, the Women's Taekwondo practicing self-defense by guarding yourself from crime and Beauty ie for the purpose of dieting, the water lilies are easy. And can help to promote health as well as fitness. Third, people with disabilities in Taekwondo is a positive way of thinking in the life of a future society, culture, and the general purpose of the rehabilitation of people with disabilities in physical education by providing opportunities for social integration and emotional stability of healthy leisure activities, rather than for the satisfaction of people with disabilities in social welfare induced that it can play an important role. Youth Taekwondo human education through the training process, raising, sociability and social life that can be amicably shaping. Therefore, the prevention of crime as well as contribute together to tackle health problems, as well as for leisure.

자동변속기 장착 차량의 아이들 셰이크 진동 성능 개선 대책에 대한 고찰

최천(Cheon Choi),서명원(Myungwon Suh),김영진(Youngjin Kim) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.4

태권도 체육관 종사자의 직무환경과 직무만족도에 관한 연구

최천(Choi Chun) 한국체육과학회 2006 한국체육과학회지 Vol.15 No.3

This study were analyzed contract infantile Taekwondo Instructors' job environment and job satisfaction at Taekwondo Gym. The purpose of the study lies in providing the basic helpful materials that may be needed to enhance productivity of contract infantile Taekwondo Instructors. 5 infantile physical education instructors were selected. The method used here to select subjects purposeful sampling, a kind of non-probablity sampling . The data in this study were gathered by using qualitative interviewing. The inductive content analysis method was used to analyze the perception of the subject This study was conducted from March to June, 2005. The findings of this study and my interpretation are as following; To enhance job satisfaction of infantile Taekwondo Instructors. First, Korean society should change and improve the perception of infantile Taekwondo Instructor. Secondly, Taekwondo Instructor should make and improve policies to guarantee job security. Lastly, for improving workplace attachment, development of various programs and specialization are needed to meet the demand of society.

댄스스포츠 참가자 유형별 결혼 만족도의 차이

최천(Choi Chun) 한국체육과학회 2006 한국체육과학회지 Vol.15 No.4

The method of this research, to study about the relation of participation in dance sport's between the level of contentment in marital life, are followings. first, the difference of the level of contentment in marital life according to the degree/period, frequency, intensity} of participation in dance sport. second, the difference of the level of contentment in marital life according to the perceived skill-competence of participants in dance sport. The subject of this study is extracted by Stratified Cluster Random Sampling among the married in Seoul(n=300). They married persons who participate in Dance sport Programme. The material of the research is analyzed according to the statistical process of descriptive statistical analysis, ANOVA and Post-Hoc for the purpose of this study. According to the statistical analysis the following results are come out. first, the difference of the level of contentment in marital life according to the degree (period, frequency, intensity) of participation in Dance sport exist partially. There is no difference in the level of contentment in marital life according to the period to take part in Dance sport. The level of contentment in marital life according to the frequency of the participation in Dance sport is found out partially different. The level of contentment of sex life appears higher in the group that participate in Dance sport once a week, and the concept of self turns up higher in the group that take part in Dance sport twice or three times a week. The level of contentment of marital life according to the intensity to participate in Dance sport affects the adaptation of character among the six subordinate variables. The group that participate in Dance sport from hours and thirty minutes to two hours appears higher in this category. second, the difference of the level of contentment in marital life according to the perceived skill - competence of participants in Dance sport exist partially. Perceived skill competence has an effect on the colleagueship and the concept of self. Those two variables appears higher in the group of primary grade.

태권도 품새 지도자의 변혁적 리더십과 운동 몰입 및 운동만족의 관계

최천(Choi, Chun),송은일(Song, Eun-Il) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5

This study is to analyze the Relationship between the Transformational Readership of Taekwondo Poomsae instructors and Sport Flow, Sport Satisfaction. Analyzed 135 Questionnaire Responses and draw a Conclusion using statistic test (Correlation Analysis & Multiple Regression) by SPSS 18.0 Statistical program. In sum, the Study Reached a Conclusion that the Readership style of a Poomsae Instructor is Related to Sport Flow and Satisfaction among Poomsae athletes trained in Colleges. First, Transformational Readership affects Sport Satisfaction. Second, Transformational Readership affects Sport Flow. Third, Sport Flow affects Sport Satisfaction.