유한요소법을 이용한 AGV 구조물의 강도해석

양영수,이세환,이천수 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3

The important parts of the developing AGV model are the fabrication of each part and the design technology of body frame. In the present day, design of the body frame depends on the experience of the industrial place. The systematic data need for the optimal design of the frame for the case of model change. In this study, the strength of the early stage AGV(Automatic guided vehicle) is examined with the 3-dimensional finite element method. In order to verify the finite element results, the computed results are compared with the experimental data from the strain-gage output. A New model was designed by removing some parts of the early staged(roughly designed) model and choosing the thickness change of the rectangular-pipes.

고저항 지대에서의 코어링 접지공사에 관한 연구

김세호,김일환,양문길 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

The resistivity of the soil depends on many parameters. It depends on the type of soil and therefore varies with distance as well as with depth. Especially soil resistivity of volcanic area is very high and it is difficult to acquire necessary grounding resistivity. This paper introduces the efficient grounding construction using coring technique for proper grounding resistance in high resistivity area. Because it is difficult to measure the accurate resistivity of soils, their resistivities are estimated using measured value of ground resistance and equivalent radius calculation method. Estimated resistivities are used for grounding resistance in scheduled grounding region.

대학생들의 운동참여제약 척도 개발

김철원,김성찬,이세형,양명환 濟州大學敎 體育科學硏究所 1995 체육과학연구 Vol.1 No.-

The purpose of this study was to develop the Exercise Involvement Constraints Scale for college students in Korea. The subjects of this study were 232 college students who were involved in physical activity classes(tennis and table tennis)at the Cheju National University. The Questionnaire consisted of a list of 44 reasons for not participating in exercise. Items were selected by reviewing related literature and on the bases of two pilot studies. First, 12-factors were extracted by the principle-components factor analysis from the correlation matrix of the subscales. Eliminations were made to those items that failed to load at least 40 on their intended factor, or emerged with a strong cross-loading(.30 or above)on a nonintended factor. From this modification, 31 items were appiled to further analysis. Second, using 31-items, exploratory factor analysis with normal varimax rotation were repeated in order to provide a more complete picture of factor structure. The results of the factor analysis reveals 8 factors that in total explain 63.7% of the variance among the subscale items. These factors were motivation, sport facilities, exercise skill, time, activity barriers, fatigue from exercise, involvment change, and lack of will power. In order to a more valid instrument, using the statistical methods of stepwise multiple regression analysis, elimination were made to three items from motivation subscale. Thus, final scale consisted of 8 subscale with 28 items. Finally, subscale and scale reliability was examied using Cronbach's coefficients alpha. Alpha reliabilites ranged from .67 to .88. As a result of these analysis, it was conclude that the Exercise Involvement Constraints Scale(EICS) was a valid and reliable instrument to measure reasons for did not participating to exercise and physical activity.

사춘기전 Ⅰ,Ⅱ급 부정교합 아동의 기도 면적, 혀의 위치와 안면 형태에 관한 연구

황용인,이규홍,이기준,김상철,조형준,천세환,박양호 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.2

본 연구는 사춘기 성장 이전의 I, II급 부정교합을 갖는 아동 환자들의 측모 두부 규격 방사선사진을 이용하여 두개 안면 형태를 조사하고 이들과 혀의 위치 및 면적, 기도의 면적과의 관계를 조사하여 비인두 기도 및 혀의 형태가 악골 및 부정 교합의 형태에 미치는 영향을 알아보았다. 9 - 11세의 교정환자 76명을 대상으로 측모 두부 규격 방사선사진상 ANB difference를 기준으로 대조군(I급 부정교합군: 0 ≤ ANB difference < 4.0)과 실험군(II급 부정교합군: ANB difference ≥ 4.0)으로 분류하였다. 혀 면적, 혀와 구개 사이의 면적, 비인두 기도 면적과 두개안면형태 항목을 측정하고 비교하여 다음과 같은 결과를 얻었다. 혀 면적, 혀와 구개 사이의 면적, 비인두 기도 면적은 II급 부정교합군과 I급 부정교합군 간에 유의한 차이를 보이지 않았다. Hyperdivergent안면 형태일수록 비인두 기도 면적이 좁았다. 안모의 전후방 수직 길이가 길수록 혀의 면적이 넓었고, 전안면 고경이 길수록 혀는 하방위치 하였다. 비인두기도 면적이 좁을수록 혀의 면적도 좁아졌다. 이상의 연구 결과 혀의 면적과 위치, 비인두 기도의 면적은 I급, II급 부정교합 간에 차이를 보이지 않으며 hyperdivergent 안면 형태 및 안모의 전후방 수직 길이와 관련이 있는 것으로 사료된다. Objective: This study examined the craniofacial morphology of young patients in their prepubertal stage showing class I, II malocclusion, by analyzing lateral cephalograms, and analyzed its relationship with tongue position, tongue space, and airway space in order to ascertain the effects of nasopharyngeal airway and tongue morphology on the form of the malocclusion. Methods: Seventy-six patients aging from 9 to 11 were divided into two groups depending on the ANB difference on the lateral cephalogram: Experimental grouP (CI II malocclusion group) showing 0 ≤ ANB difference < 4.0; Control group (CI I malocclusion group) showing 0 ≤ ANB difference < 4.0. The tongue space, space between palate and tongue, nasopharyngeal airway space and craniofacial morphology were compared between the two groups. Results: Tongue space, Palate-tongue space, nasopharyngeal airway space showed no significant differences between class I and class II malocclusion groups. Hyperdivergent faces were associated with smaller nasopharyngeal airway space. Longer anterior facial height and posterior facial height were associated with larger tongue space, and greater anterior facial height were associated with lower tongue position, Smaller nasopharyngeal airway space showed smaller tongue space. Conclusions: Tongue space and nasopharyngeal airway space showed no significant differences between class I malocclusion group and class II malocclusion group. Only anterior facial height and posterior facial height had an influence on tongue space and nasopharyngeal airway space.

Controlled synthesis of (hk1) preferentially oriented Sb2Se3 rod arrays by co-evaporation for photovoltaic applications

Park, Si-Nae,Kim, Se-Yun,Lee, Sang-Ju,Sung, Shi-Joon,Yang, Kee-Jeong,Kang, Jin-Kyu,Kim, Dae-Hwan Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.45

<P>In this paper, we propose that the microstructural control of (<I>hk</I>1) preferentially oriented Sb2Se3 films from flat films to rod arrays can improve their photovoltaic efficiency by maximizing the carrier transport characteristics. We found that, during co-evaporation, there is a narrow substrate temperature window where the Sb2Se3 rod array can be formed with an (<I>hk</I>1) preferred orientation, thus maximizing the carrier transport characteristics. The substrate-temperature-dependent morphology of the Sb2Se3 films can be explained by nucleation and growth theory and the terrace-ledge-kink model. Dramatic changes in the (<I>hk</I>0) and (<I>hk</I>1) texture coefficients occur at 315 °C, and the critical temperature for obtaining the (<I>hk</I>1) preferentially oriented Sb2Se3 film is a substrate temperature of 315 °C. On the basis of the observed variation in the film microstructure and texture coefficient, the optimum Sb2Se3 rod array having an (<I>hk</I>1) preferred orientation is formed in a narrow range of substrate temperatures. As a result, we obtained an optimized Sb2Se3 thin-film rod array that shows effective carrier transportation. Further, the optimum fill factor, short circuit current, open circuit voltage, and efficiency of the Sb2Se3 device were observed in the Sb2Se3 rod array having an (<I>hk</I>1) preferred orientation, and the enhanced carrier transport characteristics are the main reason for the improved device properties. These results show that controlling the microstructure of Sb2Se3 allows improvements in the efficiency of (<I>hk</I>1) preferentially oriented Sb2Se3 films.</P>

Small biopsy from area of Hutchinson’s sign : useful for the diagnosis of subungual melanoma in situ

( Se Jin Oh ),( Young Hwan Choi ),( Hyun Jeong Byun ),( Seung Hwan Oh ),( Se-won Park ),( Ji-hye Park ),( Jong Hee Lee ),( Joo-heung Lee ),( Jun-mo Yang ),( Dong-youn Lee ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2

Background: Although nail matrix biopsy is recommended to diagnose subungual melanoma (SUM), it is technically demanding and has potential for complication including permanent nail dystrophy. Small biopsy from area of Hutchinson’s sign (HS), an important clinical clue for the diagnosis of SUM, is thought to provide adequate samples and less invasive than nail matrix biopsy. Objectives: We investigated the diagnostic value of small biopsy of HS in SUM in situ patients. Methods: We retrospectively evaluated 9 patients who were diagnosed as SUM in situ and underwent punch biopsy at HS area. Clinical features as well as histopathological findings at HS area were analyzed. Results: All patients had finger lesions and the most common area was the thumb (40%). HS was mostly seen in the hyponychium (90%), and only one case was seen in the proximal nail fold (10%). Histopathologically, all cases showed irregularly scattered atypical melanocytes. The size of the nucleus varied from small to large, and Focal pagetoid spread was observed in 6 cases. A confluent pattern of atypical melanocytes was observed in 4 cases. Three dermatologists reviewed the slides, and 8 out of 10 cases had no difficulty in diagnosing melanoma. The remaining two cases showed subtle changes which were not sufficient for the diagnosis for SUM in situ. Conclusion: When approaching longitudinal melanonychia, we suggest that small biopsy at HS area is less invasive and useful procedure that can be selectively performed first.

A Study on the Characteristics of the Heavy Rainfall Events in Honam District along the Border of mT Airmass

Yang, Se-Hwan,Ryu, Chan-Su The Basic Science Institute Chosun University 2012 조선자연과학논문집 Vol.5 No.4

District of Korea affected by westerly wind and heavy rainfall is predominantly distributed in the west and south of Honam district. So, this study is becoming a necessity. In this study, it is investigated that the characteristics of heavy rainfall occurred frequently in Honam district along the border of mT airmass after the end of rainy season due to atmospheric instability, lower (850 hPa) convergence and topographic effect. Our results show that heavy rainfall occurred in Honam district along the border of mT airmass results from the appropriate mechanism of the unstable vertical structure and moisture flux in the expansion and contraction of the border of mT airmass. All things considered, the improvement of the predictability of heavy rainfall occurred in Honam district along the border of mT airmass could be possible by the generalization of the results of this study.

Contribution of El Niño and ocean warmth to typhoon intensity in 2015

Se-Hwan Yang,Nam-Young Kang,Dong-Jin Kim,Seol-Ki Lee,Dong-Hyun Shin 한국기상학회 2016 한국기상학회 학술대회 논문집 Vol.2016 No.4

Statistical typhoon climate model based on GloSea5 ensemble outputs

Se-Hwan Yang,Nam-Young Kang,Woojeong Lee,Jin-Chul Kim 한국기상학회 2018 한국기상학회 학술대회 논문집 Vol.2018 No.10

Statistical typhoon climate model based on GloSea 5 ensemble outputs

Se-Hwan Yang,Nam-Young Kang,Yoo Sun Hyoun,Ji-Yun Ko 한국기상학회 2016 한국기상학회 학술대회 논문집 Vol.2016 No.10