수동형 전개힌지를 이용한 전개형 우주 구조물의 전개 동특성 해석

최영준,오현웅,최용훈,이경주,Choi, Young-Jun,Oh, Hyun-Ung,Choi, Yong-Hoon,Lee, Kyung-Joo 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.3

The deployable space structure is necessary to minimize the satellite volume and launch cost. For the deployment, passive deployment mechanism has widely been used to attenuate a latch shock induced when the structure is just fully deployed. To reduce the latch shock, viscous damper is applied to the passive deployment mechanism and it can control the deployment speed of the structure. In this paper, dynamic analysis of the deployable space structure using the passive deployment mechanism with the viscous damper has been performed. The viscous damping values have been optimized through numerical simulation. The satellite's attitude influenced by pyro activation for the release of the structure has also been investigated.

초등학교 태권도 수련생의 학습유형 척도 개발 및 타당화

최영준(Choi, Young-Jun),최관용(Choi, Kwan-Yong) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3

The purpose of this study was to develop Taekwondo trainee’s learning style scale and verify validity. In order to reach this goal, component factors of learning style were explored through open-ended questionnaire, and scale development and validity were verified through exploratory factor analysis, confirmatory factor analysis and t-test verification using data collected via preliminary survey and this survey. As a result, the followings were deducted. First, component factors of Taekwando trainee’s learning style were concentrating style, disturbing style, surrendering style, competing style and confused style. Second, component factors on scale of Taekwondo trainee’s learning style were composed of 5 factors and 22 questions (8 questions of concentrating style, 3 questions of disturbing style, 6 questions of surrendering style, 2 questions of competing style and 3 questions of confused style), and all the goodness-of-fit (SRMR, RMSEA, CFI and TLI) were verified as appropriate because they satisfied the optimum criteria. Third, Taekwondo trainee’s learning style scale showed a significant difference according to demographic characteristics to be verified as appropriate.

시설하우스 외피복재 종류에 따른 참외과실의 성분 함량

최영준(Young-Jun Choi),전희(Hee Chun),김학주(Hark-Joo Kim),이시영(Si-Young Lee),염성현(Sung-Hyun Yum),최영하(Young-Ha Choi),신용습(Yong-Seop Shin),정두석(Doo-Seok Chung) (사)한국생물환경조절학회 2007 생물환경조절학회지 Vol.16 No.1

참외의 저온기 무가온 시설재배에서 원적외선 흡수율이나 무적성 등의 물리적 특성을 향상시킨 필름 피복이 참외 과실품질에 미치는 영향을 조사하기 위하여 과실 성분을 조사하였다. 일반 PE필름과 기능성이 추가 된 5가지의 필름을 6동의 하우스에 피복하여 성주지역 2곳에 각각 설치한 후 재배하였다. 하우스 내부 온도는 높은 적외선 흡수를 보였던 필름인 J-l과 J-2에서 K-3에 비해 약 2~5℃정도 높았다. 과실의 β-carotene 함량과 당함량은 기능성 필름과 일반필름에서 유의성 있는 차이를 보여 J-l, J-2, J-3 및 K-l에서 높게 나타났는데 이것은 필름의 특성에 따른 보온효과 때문인 것으로 생각된다. 성숙후 단맛을 좌우하는 sucrose 함량도 기능성 필름에서 높았는데 이로 인해 당도도 향상되는 결과를 보였다. Ascorbic acid 함량은 투광량과 보온성이 낮은 K-2에서 더 높은 경향을 보였고 무기원소 함량은 처리 간에 차이가 없었다. 이상의 결과는 참외의 저온기 단동 하우스재배에서 보온성과 투광성을 향상시킨 필름을 피복함으로써 참외 과실의 품질을 일부 개선할 수 있음을 시사하였다. This study was conducted to investigate the effect of functional cover film on oriental melon fruit quality under unheated plastic greenhouse cultivation in cold period. The 6 kind of films having different characteristics were covered at plastic greenhouses and oriental melon seedlings were cultivated at 2 regions of Seongju, respectively. The air-temperatures in plastic greenhouses of J-1 and J-2, having high infrared absorption rate, were about 2~5℃ higher than K-3. The contents of β-carotene and sugar of fruit showed significant difference between functional and normal films. The sucrose, determining a sweetness during maturation, and soluble solids content of fruits cultivated in J-1, J-2, J-3, and K-1 were higher than those of K-2 and K-3. Ascorbic acid of fruits was highest in K-2 having low light transmission rate and thermo-keeping capacity. There was no significant difference in mineral content among all of cover films. These results indicated that the use of functional greenhouse covering films could improve fruit quality such as β-carotene and sugar content of oriental melon.

WEB 기반 변전설비 원격 감시/진단 시스템 개발

최영준(Choi Young Jun),양항준(Yang Hang Jun),최용범(Chi Yong Bum),김성식(Kim Sung Sik),김정배(Kim Jung Bae) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.11

피복재 종류와 수확 후 일수에 따른 참외 과실의 당 함량 및 당도 변화

최영준(Young-Jun Choi),전희(Hee Chun),김학주(Hark-Joo Kim),이시영(Si-Young Lee),최영하(Young-Ha Choi),신용습(Yong-Seop Shin) 한국생물환경조절학회 2007 한국생물환경조절학회 학술발표논문집 Vol.16 No.1

육상 트랙 주로 형태에 따른 근대5종 선수와 육상 선수의 하지 근전도 분석 사례 연구

최영준(Choi, Young-Jun),송용관(Song, Yong-Gwan),양수연(Yang, Su-Yeon),최상협(Choi, Sang-Hyup) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.1

The purpose of present study was to compare the specific lower limb muscle activity of modern pentathlon and track and field running athlete’s during running on a straight track and a curved track on the running track. For this way, we measured kinematic patterns the muscle activity of modern pentathlon and track and field running athletes to find out more efficient lower limb use patterns and to incorporate them into running training. Therefore, we investigated the leg muscle activity and foot pressure on in advanced 3 modern pentathlon players, 5 modern pentathlon players, and age- and sex-matched 3 track players. The results showed that the use of the vastus lateralis muscle is the most important to obtain the driving force of running on a straight track, and the core to move the trunk to the center point while reducing the use rate of the left vastus medialis and right rectus femoris on a curved track. The running curves of athletes exhibited a the highest muscle activity in all lower limb muscles except the quadriceps muscle, and the muscle activity of the quadriceps muscles was more stable than that of the modern pentathlon athletes (advanced) group. Future studies in the activity of the lower limb muscles by dividing the curve running phase in detail, be able to find out the basic data for efficient curve running. Also, it is thought that more effective basic data can be obtained by examining the muscle activity of the core muscles and examining the coordination between the use of the feet and the lower limb muscles through the foot pressure analysis.

시간관리에 대한 팀의 행위적 특성이 팀성과에 미치는 영향

최영준 ( Young Jun Choi ),김성용 ( Seong Yong Kim ) 한국생산성학회 2010 生産性論集 Vol.24 No.4

Building on previous literature of time management, this article identifies structural and material characteristics as two critical components of time management in the team activities. Data from a multi-informant survey conducted in 149 teams show that a team`s behavioral characteristics of time management have significant effects on team performance. The results indicate that formalized, coordinated, and future-oriented styles of time management have a positive relationship with team performance. This study emphasizes the multidimensional nature of time management, and it helps to explain interteam discrepancies in profiting from managing time.

배기밸브 타이밍의 변화가 스파크점화 기관의 냉시동 운전에 미치는 영향

최영준(Young-Jun Choi),신인수(In-Soo Shin),김득상(Duk-Sang Kim),조용석(Yong-Seok Cho) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In an SI engine. last warmup of catalytic converter is the main key to the reduction of emission, for the conversion efficiency of catalyst is very high after it finishes warmup period. In some previous study. it is understood that the retarded ignition at the cold start helps the increase of exhaust gas. Furthermore it is very important to maintain the stable stratup and idling. If valve overlap decreases, residual gas in the cylinder would be decreased, resulting in the stable combustion at idling. In the study, as a preliminary research. the effects of exhaust valve timing on cold start<br/> are evaluated. A variable timing camshaft is used to change the exhaust valve timing. From experiments, as exhaust valve open advances, tile maximum pressure becomes higher, meaning that the combustion becomes more strong and stable. Compared with that, only the change of exhaust valve timing seems no particular effects of the exhaust gas temperature. It is considered that simultaneous control of both spark timing and exhaust valve timing should be needed to lead exhaust gas temperature high and idle operation stable.

한국 기후변동 패턴과 제조업 총요소생산성의 관계 분석

최영준 ( Young Jun Choi ),박현용 ( Hyun Yong Park ) 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2016 자원·환경경제연구 Vol.25 No.2

본 연구는 기후변수들의 변동 특성이 한국 제조업의 총요소생산성에 미치는 영향을 분석하였다. 대표적인 기후변수인 기온, 강수량, 습도는 노동효율성에 부정적인 영향을 미칠 것으로 예상되므로 기온, 강수량, 습도의 변동특성이 한국 광역자치단체 제조업 총생산성에 미치는 영향을 분석하였다. 본 연구는 최근 기후변화로 기후 변동성이 높아지는 현상을 고려하기 위해 기후변수들의 평균값뿐만 아니라 최고값을 고려하여 분석하였다. 선형회귀분석 결과 선행연구결과와 달리 기온과 습도가 제조업 생산성에 유의미한 영향을 미치지 않았다. 강수량의 평균적증가는 부정적 영향을 미치는 것으로 분석되었다. 패널자료를 분석한 결과에서는 기온, 강수량 모두 제조업 총생산에 유의미한 영향을 주지 않는 것으로 나타났다. 반면 평균 습도의 상승은 제조업 총생산을 증가시키는 것으로 나타났다. 실내 작업이 많은 제조업의 경우 기후자체의 변화보다도 기업체들의 적응능력이 생산성 변화와 직접적인 관련이 있다. 한국 제조업의 경우 기온이나 습도의 변화가 급격하게 이루어지지 않고 있고, 냉난방 시스템 구축 등을 통해 기후변화에 잘 적응하고 있는 것으로 분석된다. This study is to analyze the effects of changing pattern of climate vaariables on total factor productivity of Korea manufacture industry. Changes in temperature, rainfalls and humidity which are the representative climate variables are used as main factors. Not only average values of the variables but those highest values are used as independent variables in the model, in order to consider the characteristic pattern of recent climate change, the high volatilities. The OLS results are unlike to previous literature that temperature and humidity had no significant impact on manufacturing productivity. An increase in the amount of precipitation was analyzed that impact negatively impacted. The analysis of panel data showed that temperatures and precipitation all that does not significantly affect the manufacturing. While the increase of the average humidity is shown to increase the total productivity of manufacture industry. In Korea, adaptation capability is important in determining the effects of climate change on productivity of manufacture industry.

기후변화와 국가별 총요소생산성의 관계

최영준 ( Young Jun Choi ),박현용 ( Hyun Yong Park ) 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2015 자원·환경경제연구 Vol.24 No.2

본 연구는 기후변화가 국가의 총요소생산성에 미치는 영향을 분석하였다. 구체적으로 대표적 기후변수인 기온와 강수량이 국가의 총요소생산성에 미치는 영향을 분석하였다. 기존 연구와는 달리 본 연구는 최근 기후변화의 패턴인 기후 변동성이 높아지는 현상을 고려하기 위해 기후변수들의 평균값뿐만 아니라 최고값을 고려하여 분석하였다. 선형회귀분석 결과 평균기온의 상승은 생산성에 부정적 영향을 미치는 것으로 나타났으나 강수량의 평균적 증가는 긍정적 영향을 미치는 것으로 분석되었다. 하지만 최대 강수량은 평균 강수량과는 달리 총요소생산성을 증가시키는 것으로 분석되었다. 이러한 결과는 기존의 연구와 부합하는 것으로 나타났다. 하지만 패널자료를 분석한 결과 평균기온 이외에 다른 기후변수들(평균 강수량, 최대기온, 최대 강수량)은 유의미하게 영향을 주지 않는 것으로 나타났다. 또한 평균기온의 상승은 총요소생산 성을 증가시키는 것으로 분석되었다. 이는 본 연구가 장기시계열 자료를 이용하여 국가들의 기 후변화 적응능력에 의해 영향을 받은 것으로 분석된다. This study is to analyze the effects of climate change on national total factor productivity. Changes in temperature and rainfalls which are the representative climate variables are used as main factors to measure climate change. Not only average values of the variables but those highest values are used as independent variables in the model, in order to consider the characteristic pattern of recent climate change, the high volatilities. The OLS results are corresponding to previous literature that average temperature has a negative relationship with productivities while average rainfalls have a positive relationship. However, the results of panel analysis contradict the argument of the negative relationship between average temperature and productivities since human beings can adapt the climate change. Therefore adaptation capacity is important to forecast the effects of climate changes on economies.