구각선간간의 폭경과 상악 전치부폭경과의 관계에 관한 조사연구

오세윤,김웅철,김지환 高麗大學校 倂設 保健大學 保健科學硏究所 1998 保建科學硏究論集 Vol.7 No.2

An investigation and comparison was made on the relationship between the cuspid line width and the width of 6 upper anteriors of 56 college students (35 males and 21 females) having more than 27 natural teeth and all intact upper-lower anteriors and bicuspids. The obtained results were as follows: 1. The width of 6 upper anteriors was average 47.92±2.23㎜ for total, 48.34±2.15㎜ for male, 47.24±2.25㎜ for female. No statistical significance between sexual difference was found. 2. The cuspid line width was average 39.72±4.07㎜ for total, 38.67±4.03㎜ for male, 40.98±3.92㎜ for female and 39.72±4.07㎜ for both. No statistical significance between sexual difference was found. 3. The difference of average horizontal distance between cuspid line width and upper 6 anteror width was 3.40-4.85㎜. 4. The difference of average horizontal distance between cuspid line width and the width from one cupid tip to the other was 0.36∼1.27㎜. 5. Asymmetry of the canine position two the cuspid line was found in 62.9∼71.4%. 6. There was a significant statistical difference between the cuspid line width and the width of 6 upper anteriors (P<0.05), but correlation coefficient was low. 7. There was no significant statistical difference between the cuspid line width and the width from one cuspid tip to the other, but correlation coefficient was low.

공항서비스의 품질제고 전략

오세윤 호남대학교 인문사회과학연구소 2000 인문사회과학연구 Vol.7 No.-

와동형태의 설계에 따라 치아에 발생되는 응력의 변화에 관한 연구 : 인레이의 경우

오세윤,김웅철,김지환,유진호 高麗大學校 倂設 保健大學 保健科學硏究所 1995 保建科學硏究論集 Vol.4 No.1

Because of the anatomical form of posterior teeth, the amount of tooth reduction near the marginal ridge area in the typical, widely used intracoronal cavity will be inevitably maximal, while occlusal forces on the restoration in this area will be relatively minimal In an attempt to dicrease the amount of tooth reduction at the marginal ridge area, a modified cavity for inlay with a uniform depth of 15mm, just as in amalgam filling was designed in this study. To analize the stress development in the teeth in that cavity design, 2㎏/㎟ distributive forces were applied on the inlay restoratives and obtained results were compared with that in the typical cavity design which had a flat pulpal wall with a depth of 1.5m at the central fossa area. Analysis was done with two dimensional finite technique. The obtained results were as follows : 1. The patterns of stress distribution and displacement showed no apparent differences. 2. The stress values and the amount of displacement developed, both in inlay cast gold and in the teeth, in the cavity with a uniform depth were less than that in the cavity with a flat pulpal wall. 3. Greatest maximum principle values were concentrated around the interface between the base of inlay body and the teeth.

Formocresol과 水酸化 Calcium 및 Glutaraldehyde가 切斷施術된 齒髓에 미치는 影響에 關한 實驗的 硏究

吳世潤,韓澤善 고려대학교 의과대학 1984 고려대 의대 잡지 Vol.21 No.1

This experimental study was performed to compare the effects of formocresol, calcium hydroxide and glutaraldehyde on the vitally amputated pulp tissues. 8 premolars of each sample, total of 64 from 8 young sound dogs were pulpotomized with one of the following 8 different methods. i.e., 5 minutes application of formocresol on the amputated pulp surface and capping with zinc oxide eugenol paste mixed with formocresol, 5 minutes application of formocresol and capping with calcium hydroxide mixed with or without formocresol, 4 days application of formocresol and capping with either zinc oxide eugenol paste or calcium hydroxide, direct capping with calcium hydroxide only or calcium hydroxide mixed with formocresol, and 5 minutes application of 2% glutaraldehyde and capping with calcium hydroxide mixed with 2% glutaraldehyde. 3 dogs were sacrificed 3 weeks later and the other 5 were sacrificed 200 day later respectively, and all the pulpotomized teeth were prepared for histological findings. The obtained results were as follows; 1. In the pulp tissues that were treated with formocresol and capped with zinc oxide engenol mixed with or without formocresol, no dentin bridge was observed and inflammatory response seemed to progress deeper leading to necrosis of the pulp sooner or later. 2. In the pulp tissues that were treated with formocresol for 5 minutes and capped with calcium hydroxide mixed with or without formocresol, or directly capped with calcium hydroxide mixed with formocresol, relatively mild inflammatory reaction was observed with complete dentin bridge formation and the vitality of the remaining pulp tissues appeared to be slightly degenerated. 3. In the pulp tissues that were treated with formocresol for 4 days, generally degenerative and destructive change was severer than in the ones that were treated for 5 minutes. 4. In the pulp tissues that were capped with calcium hydroxide, more favorable tissue reaction was observed when used with formocresol than in the ones where formocresol was not used. 5. In the pulp tissues that were treated with 2% glutaraldehyde and capped with calcium hydroxide mixed with 2% glutaraldehyde instead of formocresol, generally compact dentin bridge was formed and the vitality of the remaining pulp tissues was preserved for a long time relatively with less inflammatory response. 6. In the early stage of osseous structure formation, it appeared relatively spongeous structure showing many spaces, forming tunnels between capping material and the remaining pulp. In the favorable cases, the space was more rapidly closed and dentin bridge was densely added along the lower border of osseous structure covering the remaining pulp, on the other hand, as the formation of dense dentin bridge was retarded, it was more spacious and thus the inflammatory stimulus penetrating deeper and destroying the remaining pulp more severely. 7. The vitality of remaining pulp tissue, pulpotomized with most of the usual methods, seemed to be declined so the author suppose that further more improved method would be necessary.

악안면 골격 형태에 따른 교합평면각의 변화에 관한 두부 방사선학적 연구

오세윤,김웅철,김지환,이준석,김진완,유진호,김태석 高麗大學校 倂設 保健大學 保健科學硏究所 1999 保健科學論集 Vol.25 No.1

A correlation analysis was made to understand the interaction between the growth patterns of some craniofacial skeletal components and occlusal plane inclination. 5 angular measurements(S.a. Ar.a, Go.a, UGo.a, LGo.a), 6 linear measurements(ACBL, PCBL, RH. MBL. AFH. PFH) and OP/SN. obtained from 83 cephalometric tracing records, were selected and the relationship between the occlusal plane angle and those measurements were analyzed statistically. Ramus Height(r=-0.55), Posterior Facial Height(r=-0.41), were found to be negatively related with Occlusal Plane angle, while Lower Gonial angle(r= 0.35), Saddle angle(r= 0.24) were found to be positively related with Occlusal Plane angle(p(0.05). The results obtained from the above analysis were further assessed with stepwise regression analysis, using Occlusal Plane angle as a dependant variable, and RH, LGo.a and S.a as explanatory variables. Stepwise regression analysis revealed that all the explanatory variables were found to be significant.(p<0.05) [OP/SN] = -8.74-0.33(RH)+0.23(S.a)+0.20(LGo.a). (R²=0.44). This stepwise regression analysis explains, to some extent, the relationship between the growth patterns of some craniofacial skeletal components and the occlusal plane inclination. 1. The inclination of Occlusal Plane angle is noticeably related with the growth patterns of some craniofacial skeletal components, i.e. RH, PFH, Saddle angle and Lower Gonial angle 2. In high Occlusal Plane angle, the Ram us Height tends to be shorter, and the Saddle angle and Lower Gonial angle tend to be obtuse.

IT R&D 전주기 성과관리 방안에 관한 연구

오세윤,송찬호,김상헌 한국경영정보학회 2008 한국경영정보학회 학술대회논문집 Vol.2008 No.-

한국 자동차사고의 요인분석

吳世胤 湖南大學校 1996 호남대학교 학술논문집 Vol.17 No.1

Korea is notorious for its road traffic accidents, so 10,087 were dead in 1994. But there has been a dispute on what is the major cause of the traffic accidents. Some people say the major cause is human, otheres non-human, physical, or environmental. This paper's research question is what is the major factor for the road traffic accidents in Korea. Analysis technique adopted for this paper is LISREL program. To compare in human and non-human factors which one is bigger, coefficients of gamma matrices were used. The coefficient of KSI 1, which explains human factor's effect, is 0.925. And the coefficient of KSI 2, which explains non-human factor's effect, 1.085. Notwithstanding the problems in data this program used, non-human factor's effect on traffic accidents is more powerful than human factor's effect in Korea.

치과기공사의 직업만족도에 대한 조사연구 I (근무처에 대한 만족도)

오세윤,김지환,김웅철,유진호,김태석,이태정 대한치과기공학회 2006 대한치과기공학회지 Vol.28 No.1

Objectives;The purpose of the present study is to investigate workplace satisfactionlevel of dental technicians and the differences between that of dental lab owner’s and thatof employed dental technicians, who are working in dental laboratories. Methods;Samples were comprised of 137 dental technicians working in dentallaboratories. Data were collected through self-administered questionnaires and analyzedto frequency distribution, correlation, t-test and multiple regression analysis. Results; 1) Dental technicians generally are ‘somewhat or a bit satisfied’with their workplacesituations, regardless of position, sex, and individual career. 2) Mean values of 4 items out of 11 work situation factors of employed dentaltechnicians were significantly lower than those of lab owner’s. The 4 items are theopenness of management, working environment, pay, and policy in promotion and raise.They would be sources of dissatisfaction and conflict. 3) Level of satisfaction was significantly correlated with 2 subordinate variables, i.e.working conditions and administration policy. There is a tendency that administrationpolicy is a bit more important for lab owners, while working conditions are a bit moreimportant for employed dental technicians. Conclusion;The employer-employee relationship of dental technicians seems to besound, as no signs of troublesome problem is detected. But the discrepancy revealed in theabove results is telling that there certainly exist some disagreement in the viewpoints ofthe two groups. It is necessary for the dental technicians to find ways to deal with thepossible triggers of discord and discontent.

실험설계법 기반 공기흡입구 관성분리장치 최적 바이패스 면적 선정 실험연구

오세윤,이종건,김성철,김상호 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11

공기흡입구 관성분리장치의 최적 바이패스덕트 면적을 선정하기 위한 실험연구를 수행하였다. 바이패스 면적 변화에 따른 관성분리장치의 바이패스 특성과 흡입구 시스템의 성능특성의 변화를 고찰하였다. 바이패스덕트 면적과 엔진흡입공기량의 두 가지 설계요소를 이용하여 실험설계법 기반 실험설계 최적화를 수행하였으며 이를 통해 엔진제작사의 바이패스 요구조건을 만족하면서도 최고의 성능을 발휘할 수 있는 바이패스덕트 면적을 구할 수 있었다. Wind-tunnel tests were conducted to determine the optimum bypass duct area of the inertial particle separator for the aircraft inlet duct. The effects of the bypass area variation on the bypass ratio of the inertial separator system and the performance of the inlet system were investigated. Experimental design optimization based on the design of experiments technique is then performed on the basis of two design factors: the bypass area and the engine air flow condition. The experimental results show that the bypass duct area to meet the bypass ratio requirement provided by the aircraft manufacturer can be determined to yield maximum performance.

실험설계법 기반 무미익 형상 비행체 풍동실험 연구

오세윤,이종건,김성철 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11

본 연구에서는 무미익 항공기 형상의 풍동실험에 적용한 실험설계법 접근법에 대한 연구를 수행하였다. 풍동실험은 실험설계법 기반 풍동실험연구의 일환으로 국방과학연구소 저속 풍동실험실에서 수행되었으며, 이러한 풍동실험연구에 적용한 실험설계법 기반 접근법은 실험효율성을 크게 증가 킬 수 있는 것으로 확인되었다.. This paper investigates the use of design of experiments (DOE) approach to wind tunnel testing of a tailless flight vehicle. The wind tunnel testing was conducted at the Agency for Defense Development’s Low Speed Wind Tunnel (ADD-LSWT) as part of series of tests using the DOE. The application of the DOE to the design of wind tunnel tests can result in a significant increase in test efficiency.