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장동수(Dong-Soo Jang),손우성(Woo-Sung Son) 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.3
The purpose of this study was to investigate the effects of different types of orthodontic force on the root resorption and repair in rat molar. 77 rats were divided into three groups; The control group was not equiped with orthodontic appliance between ncisor and first molar. The experimental group was subdivided into closed coil spring subgroup and elastic chain subgroup by the application methods of orthodontic force. Initial orthodontic force between incisor and first molar was 100g. Experimental period was 8 weeks; for 4 weeks the appliance was acting and for another 4 weeks, removed. Root resorption and repair in the root of first molar was examined by light microscope for histologic changes and by inductively coupled plasma spectroscopy(ICP) for quantitative changes. The results were as follows: 1. In the closed coil spring subgroup odontoclasts and root resorption were appeared one week earlier. 2. One week after orthodontic force was eliminated the repair response in the resorptive lacuna was seen in both subgroups. Delayed resorption was seen on the periphery of resorptive lacunae whereas reparative response was seen in the center of lacunae. A new resorption was seen one week after orthodontic force was eliminated. Root contour was partially restored by repairing of resorbed root. 3. The weight ratios of calcium and phosphorous to the sample were decreased during resorptive process but increased during repair process in both the orthodontic groups, but not more than the control group. 4. By different types of orthodontic force (closed coil spring or elastic chain) resorption process was affected but repair process was not.
착상조건에서 열교환기 형상 변수에 따른 열전달 성능에 관한 해석적 연구
장동수(Dong Soo Jang),박성기(Seonggi Park),이상헌(Sang Hun Lee),조원희(Wonhee Cho),김용찬(Yongchan Kim) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
This study presents the heat transfer performance according to the heat exchanger type under frosting conditions. The heat transfer performance of the three types of heat exchangers such as plate fin-tube heat exchanger with inline tube alignment, plate fin-tube heat exchanger with staggered tube alignment, and spirally-coiled circular fin-tube heat exchanger was analytically investigated. The heat transfer performance of the heat exchangers according to fin shape, number of tube rows, and tube arrangement was compared and discussed. Initially, the performance of the plate fin-tube heat exchanger was excellent, but the performance of the spirally-coiled circular fin-tube heat exchanger was better after a certain period of time. As the number of tube rows increased, the heat transfer performance increased but the effect of frost growth on the heat transfer decrease increased.
설계 변수에 따른 진동형 히트파이프의 열전달 성능특성에 관한 연구
장동수(Dong Soo Jang),장용희(Yonghee Jang),이은지(Eun-Ji Lee),김용찬(Yongchan Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
In this paper, the thermal performance of a pulsating heat pipe was studied with the variation of design parameters. The experiment was done varying hydraulic diameter, number of turns, filling ratio. Hydraulic diameters of channels are 1.6 and 2.4 mm and the numbers of turns are 32 and 16. Two pulsating heat pipes were made of brass plate, on which channels were grooved. Distilled water was used as a working fluid and the filling ratios of working fluid were 0, 30, 40, 50, 60%. Input powers were varied from 50 to 150 W. When the hydraulic diameter was 2.4 mm and the filling ratio was 40%, the pulsating heat pipe showed the best performance, reducing thermal resistance up to 50%.
운동선수의 성격이 코치와 선수의 관계 유지에 미치는 영향
장동수 ( Dong-soo Jang ),성창훈 ( Chang-hoon Seong ) 한국스포츠정책과학원(구 한국스포츠개발원) 2017 체육과학연구 Vol.28 No.1
[목적] 본 연구는 운동선수들의 성격이 코치와 선수의 관계유지에 미치는 영향을 알아보기 위한 목적으로 수행하였다. [방법] 이를 위해 284명의 개인종목 선수들을 대상으로 성격 5요인과 코치-선수 관계 유지 척도 (CARM-Q)를 활용하여 자료를 수집하고 분석하였다. [결과] 먼저 성격은 코치-선수 관계 유지에 상당한 영향을 미치는 것으로 나타났다. 또한 코치와의 긍정적 관계를 결정하는 성격 요인의 영향력을 알아보기 위해 인공신경망 분석을 한 결과, [결론] 호감성이 코치-선수 관계를 유지하는 주요 판별요인임을 확인했으며, 아울러 개방성과 성실성도 코치와의 관계를 긍정적으로 유지 및 발달시키는 것으로 나타났다. [Purpose] This study was to examine the effect of athletes` personality on coach-athlete maintenance of relationship. [Methods] For this purpose, the data was collected by 284 athletes using personality five factor questionnaire and Coach-Athlete Relationship Maintenance Questionnaire(CARM-Q). correlation and multiple regression analysis were conducted to verify the relationship between five personality factors and maintaining coach-athlete relationship. [Results] The results were as follows: Personality had a significant effect on the maintenance of coach-athlete`s relationship. Firstly, the artificial neural network was analyzed to find the influence of personality that determine positive relationships with coaches. [Conclusion] As a result, it was confirmed that the favor was the main discriminant factor in maintaining the relationship of coach-athlete. Finally, openness and sincerity were found to maintain and develop the positive relationship with coaches.
코치의 강인성 및 사회적 지지와 스트레스-탈진 관계 모형 검증
장동수(Jang, Dong-Soo),성창훈(Seong, Chang-Hoon),이기세(Lee, Ki-Se),송규근(Song, Gyu-Geun) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.70
The purpose of this study is to examine whether the coaching stress-burnout model by Kelley (1994) developed in the West for individuals and team coaches such as shooting, Taekwondo, gymnastics and boxing has universal validity in domestic culture. In other words, do the coach’s personal problem, the stiffness of the stress and the social support of the environmental issue act as reaction variables for stress? We hypothesized that psychological - social variables affect stress and affect burnout of coaches. First, the structural equation was tested to verify the coach stress-exhaustion model. As a rseult, ‘exercise practice’, ‘attitude of life’ and ‘interpersonal competence’ of ‘robustness’ showed a decrease in stress of coaches. ‘Informal, emotional and instrumental support’ of ‘social support’ showed a decrease in coaches’ stress such as economic difficulties, interpersonal relationships and training conditions. In the relationship between ‘coaching stress’ and ‘coaching burnout’, ‘burden of performance’ was the most influential factor in both ‘lack of achievement’ and ‘physical & mental exhaustion’. Second, ‘robustness’ in response to stress decreased ‘stress’, but it increased ‘burnout’ rather. Also, ‘social support’ showed a decrease in ‘stress’, whereas ‘social support’ did not affect ‘burnout’. In the study, the coaches’robustness for stress decreases the stress, but they also increases the burnout, which is contrary to the previous research results. This means thath te athlete’s stress can change spontaneously as a result of performance, but the stresses of the coaches can come from constant and evolving stresses that worry about the present and upcoming future and environment. I guess this will strengthen coach’s exhaustion. Therefore, it is necessary to confirm the detailed factors of the evolved stress in the follow - up study.
Exposure Index를 이용한 이동형 디지털 X선 장치의 흉부촬영 적정노출조건에 관한 연구
김재인,이양섭,장동수,정민철,배승호,이관섭,하동윤,Kim, Jae-In,Lee, Yang-Sub,Jang, Dong-Soo,Jung, Min-Cheol,Bae, Seung-Ho,Lee, Kwan-Sub,Ha, Dong-Yoon 대한디지털의료영상학회 2011 대한디지털의료영상학회논문지 Vol.13 No.3
The purpose of this report is recommending a standard indicator which reflects the radiation exposure that is incident on a detector after every exposure event and that reflects the noise levels present in the image data. The experiment was performed with mobile digital X-ray unit and used a acrylic phantom for exposure index measurement. Exposure modality was kVp, mAs, SID. After every exposure, make a data sheet for characteristic curve of detector response. The equipment performed Mobile digital X-ray unit provide the user with values ralated to the incident exposure(air kerma)to the digital detector. They are showed as a logarithmic function shaped. As a result, DEI means a relative measure of exposure to the detector, as compared to the expected exposure for a particular anatomical view. Radiographic technique is the combination of factors used to exposure an anatomical part to produce a high quality radiography and technique charts used most commonly by radiographers to produce consistently exposure level which patient dose can be kept acceptably low.