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임그린,탁진국,김기년,김태은,임광모,김거도,방준석,임슬기 한국심리학회 2015 한국심리학회지 일반 Vol.34 No.1
본 연구의 목적은 김기년과 탁진국(2013)의 청소년용 강점척도를 재 타당화 하기 위해 전국 규모의 표집을 통해 강점검사의 타당도, 특히 구성타당도를 재분석하여 동일한 20개 요인구조가 도출되는지를 검증하고, 이러한 요인구조가 전체 청소년, 성별(남/여), 학년(중학교/고등학교), 남자(중/고등학생), 여자(중/고등학생) 등 하위집단으로 구분하였을 때도 동일하게 나타나는지를 살펴보는 데 있다. 이를 위해 전국의 중학교 및 고등학교 학생 33,379명을 대상으로 설문을 실시하여 불성실 응답자를 제외한 총 32,640명의 자료를 주성분 요인분석을 실시하여 얻어진 20개 요인과 94개 문항을 각 집단에 적용하여 동일한 요인이 도출되는지를 확인한 결과, 남자 고등학생 집단을 제외한 모든 집단, 즉 전체 응답 집단, 여학생 전체 집단, 남학생 전체 집단, 고등학생 전체 집단, 여자 고등학생 집단, 중학생 전체 집단, 남자 중학생 집단, 여자 중학생 집단에서 동일한 20개 요인이 도출되어, 20개 요인구조모형이 일관성 있게 적용되는 것으로 나타났다. 또 이 탐색적 요인분석 결과인 20개 요인구조의 타당성을 재검증하고자 구조방정식 모형을 통한 확인적 요인분석을 실시한 결과, 20개 요인구조 모형의 적합도가 양호하여 구성타당도를 입증할 수 있었다. 한편 남자 고등학생 집단을 대상으로 한 요인분석에서는 예의와 배려 요인이 동일한 요인으로 묶여 19개 요인구조모형이 적합한 것으로 나타났다. 이 과정에서 4개 요인의 요인명이 변경되었다. 결론적으로 본 척도의 신뢰도와 타당성을 확인할 수 있었다. 이 연구결과를 토대로 본 연구의 의의 및 실무적 시사점에 대해 논의 하였다. The purpose of this study was to analyze construct validity of the Adolescents Strengths Assessment Inventory(Kim & Tak, 2013). Data were obtained from 33,379 junior and high school students across the country. The whole data were divided into various subgroups to see if the same factor structure is consistently found for each subgroup. These subgroups are as follows: male and female students, junior and high school students, male junior and male high school students, female junior and female high school students. Results showed that the same 20 factors emerged for the whole data as well as for each of the subgroups, except for the male high school students. 19 factors were found for the male high school group. Also, the names of four factors were changed. The interpretations and implications and of the results were discussed.
5kW 용융탄산염 연료전지(MCFC) 이젝터 설계 및 시험
김범주,김도형,이정현,이성윤,김진열,강승원,임희천 한국수소및신에너지학회 2009 한국수소 및 신에너지학회논문집 Vol.20 No.1
An ejector is a machine utilized for mixing fluid, maintaining a vacuum, and transporting fluid. The Ejector enhances system efficiency, are easily operated, have a mechnically simple structure, and do not require a power supply. Because of these advantages, the ejector has been applied to a variety of industrial fields such as refrigerators, power plants and oil plants. In this work, an ejector was used to safely recycle anode tail gas in a 5 kW Molten Carbonate Fuel Cell system at KEPRI(Korea Electric Power Research Institute). In this system, the ejector is placed at mixing point between the anode tail gas and the cathode tail gas or the fresh air. Commercial ejectors are not designed for the actual operating conditions for our fuel cell system. A new ejector was therefore designed for use beyond conventional operating limits. In this study, the entrainment ratio is measured according to the diametrical ratio of nozzle to throat in the designed ejector. This helps to define important criteria of ejectors for MCFC recycling.
배 유기재배에서 녹비작물 재배에 의한 식물양분 환원효과
임경호,최현석,김월수,김선국,송장훈,조영식,최장전,정석규 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.1
This study was conducted to evaluate the effects of ground cover treatments on the nutrient contribution in a ‘"Niitaka’" pear (Pyrus pyriforia) orchard. Treatments included; 1) sod culture, 2) winter cover crop [ryegrass+hairy vetch], and 3) winter [ryegrass+hairy vetch]+summer [greensolgo (sudan grass (Sorghum bicolor L.))+nemajanghwang (crotalaria (Crotalaria juncea L.)] cover crops. Ryegrass and hairyvetch were seeded with 6.4 kg/10a and 3.0 kg/10a, respectively, on October 17 of 2008, and greensolgo and nemajanghwang were seeded with 2.0 kg/10a and 3.0 kg/10a, respectively, on June 4 of 2009 at a diligent farmer in Boseong in Chonnam. Winter+summer cover crops provided greater amounts of dry weight, followed by winter cover crop and sod culture. The difference of amounts of dry weight from the ground covers affected to the levels of total N, P, and K contents, which were greater nutrient levels than those of recommended nutrient requirement for satisfying 10- to 12-year-old pear tree growth. Greater amounts of dry weight from the ground covers increased organic matter and concentrations of K and Mg in soil. Foliar nutrient concentrations, as an indicator of nutrient status of a tree, were not affected by application of ground cover treatments.