http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 高水林 (검색결과 648 건)
- 무료
- 기관 내 무료
- 유료
-
-
-
-
하이브리드 로켓용 파라핀 연료의 후연소실 L/D비 변화에 따른 연소 특성 연구
고수한(Suhan Ko),이동희(Donghee Lee),문희장(Heejang Moon) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.5
파라핀 연료는 미연소 액적들이 노즐로 배출되어 연소 효율이 낮아 연소 효율과 직결된 후연소실의 최적화는 중요한 성능인자로 대두되고 있다. 따라서 본 연구는 하이브리드 로켓용 파라핀 연료의 후연소실 길이 및 직경 변화에 따른 연소 특성을 파악하기 위한 연소 시험을 수행하였다. 연소 시험결과, 후연소실 길이가 증가할수록 연소 효율이 상승함을 확인하였으며 이는 후연소실 길이가 증가할수록 연소가스의 잔류시간이 증가하기 때문으로 사료된다. 반면, 후연소실 직경의 변화에 의한 연소 효율의 차이는 크지 않음을 확인하였다. 따라서 파라핀 연료에 대하여 연소 효율은 후연소실의 직경보다는 길이의 영향이 큰 것으로 판단된다. Paraffin fuel has low combustion efficiency due to unburned droplets discharged from the nozzle, hence, optimization of the post-chamber is becoming an important performance factor. In this study, combustion tests were conducted by changing the length or diameter of the post-chamber to determine the combustion characteristics of paraffin fuel for hybrid rocket. As a result, the combustion efficiency increased due to the rise of the residence time as the post-chamber length increased. On the other hand, it is considered that the influence of the change in the diameter was not significant.
-
高秀晩 단국대학교 일본연구소 2010 일본학연구 Vol.30 No.-
The phonetic reading of Sino-Japanese characters being used nowadays in Japan mostly originates in Kan-on or Go-on. It is said that Kan-on takes its root in Changan-on of Tang era. A prevailing theory regarding how Go-on was first created is that it had been derived from the phonetic reading system of China’s Southern areas. The standard phonetic reading of Tang was based on the phonetic system of China’s Northern areas, which was changed a lot from the standard phonetic system of the preceding era. But in Southern areas of China, the standard phonetic system of the preceding era still remained in use at that time, which people of Tang called Go-on. Japanese diplomats or monks dispatched to Tang familiarized themselves with the standard phonetic system of the times in Changan, capital of Tang, and took the phonetic reading system with them when coming back to Japan, which they started to call ‘Kan-on,’ meaning something representative of China. On the other hand, the Japanese called the phonetic system of the previous era ‘Go-on,’ just like people of Tang called it that way. In other words, Kan-on and Go-on at that time meant a ‘New phonetic system’ and ‘one from an old time’ respectively. At first, they simply meant new and old phonetic reading systems from China. But, since Kamakura when the phonetic reading of Sino-Japanese characters was totally Japanized, a distinction started to be made between these two; ‘Kan-on’ has come to represent those that strictly followed the phonetic system of Tang, while others long in use from much before were called ‘Go-on’.
-
국립자연휴양림의 이용객 수요에 따른 적정 조성개소수 예측 연구
고수선(Ko, Su-Seon),한상열(Han, Sang-Yoel) 한국산림휴양복지학회 2017 한국산림휴양학회지 Vol.21 No.2
주 5일 근무제의 정착에 따른 여가시간의 증대, 기술혁신에 따른 교통의 발달로 느끼는 거리감의 감소, 건강에 대한 관심증가, 세대교체 등으로 자연을 찾는 인구는 점차적으로 증가하는 추세에 있다. 산림청에서는 수림이 빼어난 국유지에 국민들이 편안하게 쉬며 몸과 마음을 편안하게 위한 휴식공간으로서 자연휴양림을 1988년부터 조성하기 시작하여, 2015년을 기준으로 39개소를 운영 중에 있다. 앞으로 2050년까지 전개될 우리나라의 사회 전반적 양상의 다양한 변화로 인해 산림복지에 대한 국민적 수요가 발생할 것으로 예상되어 산림복지서비스와 관련된 시설조성이 증가하고 있는 추세이다. 이로 인하여 현재 산림복지시설의 핵심시설인 자연휴양림 이용객 수요의 변화가 있을 것으로 예상된다. 본 연구에서는 공·사립자연휴양림의 조성개소수와 시간의 흐름을 고려하여 국립자연휴양림 이용객의 수요를 예측하였고, 조성개소수에 따른 국립자연휴양림 이용객수요를 예측하여 둘의 합의점을 찾아 적정 조성개소수를 산정하였다. 2020년 국립자연휴양림 이용자수는 3,639,645명, 2025년 4,050,165명으로 나타나 2020년까지 45개소, 2025년까지 49개소를 조성한다면 이용객의 수요를 충당할 수 있을 것을 판단된다. With an increase in leisure time as a result of the five-day work week, reduction of temporal distance due to the development of transport and baby boomers replacement, the population finding the natural has gradually increased. The Forest Service began to establish a national recreation forest since 1989 to rest comfortably in the superb forests. Currently, National Recreation Forest Management Office has operating 39 national recreation forest. However, there will be change in social trends such as a gradual decreasing population, an increase in the elderly population by 2050. And Forest healing circle and Soopchewon, appeared similar to the national recreation forest, will be formed. As a result, it is expected that there is a change in the demand of the national recreation forest passengers. In this study, the demand of the national recreation forest is estimated considering the demographic change, the number of public and private recreation forest and the time trend. The demand of the national recreation forest is estimated depending on the number of national recreation forest. Through the comparison of the both, the optimum number of the national recreation forest is estimated. The demand of national recreation forest is expected to 3,639,645 people in 2020 and to 4,050,165 people in 2025. Considering the national authorities contained the same concept and current management resins, it is considered necessary the direction of the new policy, the restructuring and a variety of programs rather than the composition of the new construction.
-
산업연관모델을 이용한 산림휴양형 계류낚시시설의 경제적 파급효과
고수선(Ko, Su-Seon),이동호(Lee, Dong-Ho),한상열(Han, Sang-Yoel),주성현(Joo, Sung-Hyun) 한국산림휴양복지학회 2016 한국산림휴양학회지 Vol.20 No.4
본 연구는 낙후된 산촌마을에 새로운 수입원으로써 산림휴양형 계류낚시 시설의 경제적 효과를 분석하기 위해 수행되었다. 현재 국내에서 운영된 사례가 없어 운문산자연휴양림에 산림휴양형 계류낚시시설을 조성하여 시범운영을 실시하였다. 시범운영 진행시 참가한 100명의 방문객들의 결과를 바탕으로 항목별 여행지출비용을 조사하고, 한국은행에서 발간한 산업연관표(2011년 연장표)에서 산림휴양형 계류낚시 시설 부분을 분류하여 승수를 도출한 후, 생산, 소득, 부가가치, 고용파급 효과를 평가하였다. 산림휴양형 산림계류낚시시설 방문객들이 지출한 연간 총 비용의 직·간접 및 유발 효과를 산출한 결과로 국가전체 경제에 발생시킨 연간 생산파급액은 829백만 원, 소득파급액 105백만 원, 부가가치파급액 314백만 원, 고용파급자수 9명으로 나타났다. This Study is to estimate the economic impacts of Mountain Stream Fishing facilities for recreation by using Input-Output model. Currently there is no Mountain Stream Fishing facilities for recreation in Korea. First Mountain Stream Fishing facilities for recreation was constructed in Unmunsan Natural Recreation Forest and test operation was conducted. This survey investigated to estimate per capita travel expenditures of Unmunsan Recreational Forest visitors. Furthermore, economic sectors of expenditures associated with Mountain Stream Fishing facilities were classified from national transactions table. In terms of output, income, value added, and employment, the Input-Output model were derived from multipliers of these sectors. The result shows that mountain stream fishing facilities’ economic impacts were estimated as 829 million won of output impact, 105 million won of income impact, 314 million won of value-added and 9 employee effect, respectively.
-
-
Mammographic Density Estimation with Automated Volumetric Breast Density Measurement
고수연,김은경,김민정,문희정 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.3
Objective: To compare automated volumetric breast density measurement (VBDM) with radiologists’ evaluations based on the Breast Imaging Reporting and Data System (BI-RADS), and to identify the factors associated with technical failure of VBDM. Materials and Methods: In this study, 1129 women aged 19–82 years who underwent mammography from December 2011 to January 2012 were included. Breast density evaluations by radiologists based on BI-RADS and by VBDM (Volpara Version 1.5.1) were compared. The agreement in interpreting breast density between radiologists and VBDM was determined basedon four density grades (D1, D2, D3, and D4) and a binary classification of fatty (D1–2) vs. dense (D3–4) breast using kappa statistics. The association between technical failure of VBDM and patient age, total breast volume, fibroglandular tissue volume, history of partial mastectomy, the frequency of mass > 3 cm, and breast density was analyzed. Results: The agreement between breast density evaluations by radiologists and VBDM was fair (k value = 0.26) when the four density grades (D1/D2/D3/D4) were used and moderate (k value = 0.47) for the binary classification (D1–2/D3–4). Twenty-seven women (2.4%) showed failure of VBDM. Small total breast volume, history of partial mastectomy, and high breast density were significantly associated with technical failure of VBDM (p = 0.001 to 0.015). Conclusion: There is fair or moderate agreement in breast density evaluation between radiologists and VBDM. Technical failure of VBDM may be related to small total breast volume, a history of partial mastectomy, and high breast density.
-
KCI연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
