http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Choi, Yeontaek,Kim, Byung-Gu,Lee, Changhoon Published by the American Physical Society through 2009 Physical review. E, Statistical, nonlinear, and so Vol.80 No.1
<P>We provide an observation suggesting a strong correlation between helicity and enstrophy in fluid turbulence. Helicity statistics were obtained in a direct numerical simulation of forced isotropic turbulence. An investigation of coherent structures revealed that intermittently large local helicity was found in the core region of the coherent rotational structures, thus showing a strong correlation with local enstrophy, not dissipation. Statistics regarding the relative helicity and the correlation between velocity and vorticity conditioned on different levels of enstrophy clearly suggest that velocity and vorticity tend to be aligned in the core of the coherent structures.</P>
델파이 기법을 이용한 스킨스쿠버 활성화 요인 도출 연구
권연택 ( Yeontaek Kwon ),여경아 ( Kyoungah Yeo ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 체육과학연구 Vol.28 No.3
[목적] 본 연구는 효과적인 스킨스쿠버 활성화 요인을 도출하는데 협의의 목적이 있으며, 스킨스쿠버 관련 연구범위를 확장시키는 기초자료 제공에 광의의 목적이 있다. [방법] 델파이 방법을 활용하였으며, 조사결과를 분석하기 위해 전문가 회의를 거쳐 요인을 범주화하였다. 2차와 3차 델파이조사를 통해 수집된 설문자료는 SPSS win ver. 22.0과 Microsoft Office Excel 2013을 활용하여 평균, 표준편차, 중앙값, 변이계수를 산출하였다. [결론] 구체적인 결론은 아래와 같다. 첫째, 조직 하위요인은 동호인, 대학동아리 클럽 육성이 매우 중요하게 나왔으며, 국민안전처, 해양수산부 등과의 협조체제, 타 교육단체 간 협조 및 교류 강화, 스킨스쿠버 교육단체 관리·감독 기관 신설, 스킨스쿠버 교육단체 설립 순으로 나타났다. 둘째, 시설/장비 하위요인은 해양다이빙 시설 확충(다이빙 전용선박 배치, 장비대여시설 확충, 여성전용공간 설치, 다이빙리조트 주변 환경미화, 다이빙 포인트 조성), 의료기관과의 연계 시스템 마련(감압챔버 구비된 병원과의 협력 시스템 구축, 전용선박과 리조트 내의 응급비상연락망 및 구조장비 확보 등), 실내다이빙 교육 시설 확충(수심 5m 이상 다이빙 풀 조성), 스쿠버 장비 개선(노후 렌탈 장비개선, 장비 기술개발 및 경량화 추진 등)순으로 나타났다. 셋째, 지도자 하위요인은 지도자 인성교육 및 검증을 통한 강사 배출, 전문교육기관 지도자 배출 시스템 투명화, 지도자 처우개선(지적재산권 보장, 복지, 사고 시 강사보호 등)순으로 나타났다. 넷째, 프로그램 하위요인은 안전교육 프로그램, 환경교육/전문인력 양성 프로그램, 다양한 프로그램 개발(주변 관광 상품 및 타 해양스포츠와 연계), 보험상품 개발 순으로 나타났다. 다섯째, 홍보 하위요인은 다이빙 인식 변화 유도(가격, 안전, 그린스포츠 등), 다이빙 관련 행사 확대(다이빙 관련 시합 및 행사 확대 등), 홍보시스템 구축(홍보매체의 다양화, 국내·외 다이빙 전용 사이트 구축-다양한 언어 제공 등)순으로 나타났다. 여섯째, 정책 하위요인은 행정부처 간 협조체제 구축(정부-리조트-지역어촌계), 법·제도 개선(스킨스쿠버 관련법 개선-수상레저안전법, 체육시설설치이용에 관한 법률, 어항법, 수상법 등, 다이빙 전용 활동 수역 마련, 다이빙 장비 가격 정찰제 구축 및 주기적 안전점검 실시제도 구축, 다이빙 교육비 정찰제 도입 등) 순으로 나타났다. [Purpose] The purpose of this study is to find effective skin scuba activation factors and to provide basic data that extend the scope of research related to skin scuba. [Methods] Delphi method was used and the experts were categorized by experts to analyze the results. The questionnaires collected through the 2nd and 3rd delphi surveys were SPSS win ver. 22.0 and Microsoft Office Excel 2013 to calculate mean, standard deviation, median, and coefficient of variation. The concrete conclusions are as follows. [Conclusions] First, in terms of organization sub-factor, fostering sports-for-all participants and college club came out to be very effective and followed by cooperation system with Ministry of Public Safety and Security and Ministry of Oceans and Fisheries, strengthening cooperation and exchange with other education organizations, initializing new scuba diving education organization management and inspection institution and establishing scuba diving education organization. Second, in terms of facility/equipment sub-factor, factors that cause most effectiveness came out as expanding scuba-diving installation, developing connection system with medical department, enlarging indoor-diving education facilities, improving scuba diving equipment, consecutively. Third, in terms of leader sub-factor, training instructor through leader personality education and verification came out to be the most effective, followed by objectifying professional education institution leader training system, improving leader treatment. Fourth, in terms of program sub-factor, it is found that safety education program as the most effective factor, coming next with environment education/ professional manpower training program, developing various programs, lastly, inventing insurance product. Fifth, in terms of advertisement sub-factor, as in order of guiding publics to change their view towards scuba-diving, expanding scuba-diving related events and establishing advertisement system had its effectiveness. Sixth, in terms of policy sub-factor, establishing cooperation system among administration departments came out to be most effective and then improving related law-system.
최연택(Yeontaek Choi),이창훈(Changhoon Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Helicity in isotropic turbulence was well known to have intermittent fashion in their statistics. But its exact explanation about the onset of intermittency of helicity in turbulence did not give clearly yet. Most probable causes comes from the vortical motion of the fluids. Distribution of the angle between fluid velocity and vorticity have alignment tendency. This may be a clue to investigate intermittency of helicity. In this study, we aim to review and establish approaches to reveal the mechanism and the origin of intermittency of helicity in the isotropic turbulence. To do those work, we look for some quantities like helicity, enstrophy, acceleration and its flatness. And also correlations among them are sought.