단안 안검봉합에 의한 병아리 안구크기의 변화

최시환,김세윤,서병로,민병무 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.2

In an attempt to elucidate the eyeball enlargement by eyelid suture, two-day old white Leghorn chickens (n=20) were lightly anesthetized with ether and monocular upper and lower eyelids were sutured together with 6-0 black silk. The other eye was used as control group. Refractive error, corneal curvature, or axial length by ultrasonography were assessed before the study, and 3 weeks and 6 weeks after lid suture. Dimensional changes, intraocular pressure, and weight of enucleated eyeball were measured at 6 weeks. The results of the study were as follows: 1. The eyelid sutured group developed significant axial elongation (11.00±0.36mm vs 10.69±0.24mm, mean±SD, by ultrasonography; 12.57±0.66mm vs 12.02±0.41mm by micrometer), equatorial length (15.48±0.45mm vs 15.32±0.48mm), and weight (1.51± 0.12g vs 1.39±0.09g) in comparison with control group. 2. Corneal sag and diameter, intraocular pressure, and refractive error were not significantly different between both groups. Our results support the hypothesis that form-vision deprivation induces the enlargement of eyeball, especially the posterior segment of the eyeball.

치과기공사의 스트레스 증상과 직무요인과의 관련성 연구

김지환,오세윤,김웅철,유진호,김태석,이준석,이원철 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.2

This study was carried out to investigate psychiatric stress symptoms and stress- inducing factors, such as role overload, work demand, work procedure and so forth in korean dental laboratory technicians. Questionnaires were mailed to randomly selected 1000 dental technicians who were systematically selected. Among them, 786 dental technicians completed the questionnaires and returned them. Validity test and reliability test on the questionnaires were done prior to the main survey, using the SCL-90-R as a standard. Stress-inducing factors were identified with a multiple regression analysis on the continuous variables. To investigate stress-inducing factors on stress symptoms, analysis on distribution of characteristics was performed, and then correlation analysis and multiple regression analysis was carried out. The results of the study were as follows: According to multiple regression analysis, there was a statistical correlation between stress symptoms and role overload, work procedure, occupation conflict, interpersonal relationship, social support, personality traits in stress symptom(GSID). The stress symptoms in korean dental laboratory technicians seemed to be mostly job related ones, and considering the results obtained from the study, it is suggested that reducing work load and proper health promotion programs for dental technicians be necessary.

우리나라 치과 기공사의 건강 습관에 영향을 미치는 요인

오세윤,김웅철,김지환 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

This investigation was carried out to evaluate the relations between the levels of health practices and their attributable factors in Korean dental laboratory technicians A questionnaire listing six groups of health practices and their related factors was mailed to randomly selected 1,900 dental laboratory technicians. Among them, 1,344 dental laboratory technicians filled out the questionnaires and returned them. Before the start of main survey, a pilot survey was carried out for validity test of the questionnaire. All the data obtained were corded and analyzed with PC/SAS 6.12 program. The level of inappropriate health practices was the highest in irregular exercise(85.3%), and followed by smoking(61.0%), drinking of alcohol(59.1%), irregular eating habits(45.6%), inappropriate sleep duration(32.2%), and obesity(9.4%). Statistically significant factors by multiple logistic regression analyses were sex. work part in obesity: age. work area. number of employees in hours of sleeping: sex, self assessed health status, health examination, work area, work hours in eating habits: sex, marital status, education in smoking : sex in drinking of alcohol : self assessed health status : health examination, work hours in exercise '. and sex, work hours in health practice index. With the above considerations in mind, the levels of health practices in Korean dental laboratory technicians was relatively low and that was attributable to most of the sociodemographic characteristics, health examination and health status and work history. It is suggested that health promotion programs for promoting self-assessed health status, carrying out health examination, reducing work hours, and measures for elevating the level of health practice of male techinicians be necessary.

打擊速度 및 溫度變化가 豫크랙을 가진 衝擊試驗片의 動的破壞靭性에 미치는 影響

兪在煥,李敬奉,金重吉,李致雨,吳世旭 慶南大學校 附設 工業技術硏究所 1989 硏究論文集 Vol.7 No.-

計裝化衝擊試驗에서 打擊速度와 溫度의 變化가 豫크랙을 揷入한 衝擊試驗片의 動的破壞靭性에 미치는 影響을 考察한 結果 다음을 알 수 있었다. 豫크랙을 揷入한 試驗片이 V-노치 試驗片에 比하여 實驗値의 分散度가 적으며 0℃以下의 溫度領域에서 動的破壞靭性의 有效性이 있었다. 또한 打擊速度와 實驗溫度의 影響은 溫度가 速度보다 훨씬 上廻하는 傾向이었다. The effect of various impact velocity and temperature on dynamic fracture toughness is tested with precracked Charpy specimen, and conclude following results. Precracked specimen has less dispersion of test results than V-notched specimen, unstable crack initiation load didn't agreed to maximum load at room temperature but at 0℃ below, thus, the availability of dynamic fracture toughness is relatively high. Comparing V-notched specimen, the precracked Charpy specimen represented lower shelf of temperature different. But, at this time, the absorbed energy is estimated equivalently. With the decrease of temperature, the reduction of fracture toughness was obvious, but the effect of impact velocity didn't appear.

실험적 만성 전립선염의 발병기전에 대한 초미형태학적 연구

안명환,장세국,곽정식,손태중 慶北大學校 醫科大學 1994 慶北醫大誌 Vol.35 No.4

목적 : 전립선염에 관한 지금까지의 연구는 항생제의 침투와 항생제를 이용한 치료법의 개선에는 많으나 발병기전에 대한 연구는 매우 적다. 이에 만성세균성 전립선염의 발병기전을 형태학적으로 규명하고자 한다. 대상 및 방법 : Spraque-Dawley계 흰쥐(약 200g)의 전립선에 Escherichia Coli희석액(10^8㎖) 0.2㎖를 투여한 후 1주, 2주, 3주, 및 5주에 광학 및 현미경으로 관찰하였으며 전립선조직내 IgG, IgA 및 IgM의 분포를 확인하기 위해 avidin-biotin-peroxidase complex방법으로 면역 염색을 하여 광학 현미경으로 관찰하였다. 결과 : 광학현미경 소견은 E coli투여 후 1주에는 전립선의 선강 및 간질조직에 호중구와 대식세포가 심하게 침윤되었으며 이러한 소견은 2주후에도 지속되었다. E coli 투여 후 3주 이후에는 염증은 약간 완화되었으나 간질의 섬유화가 일어나 만성전립선염의 소견이 나타났다. IgG, IgA 및 IgM 은 E coli 투여 후 1주에 전립선의 분비선 주위와 간질조직 및 염증세포내에 강양성으로 나타났으며 5주까지도 지속되었다. 전자현미경 소견은 E coli 투여 후 1주에는 전립선의 선강 및 선상피세포 사이에 호중구와 대식세포의 침윤이 심하였고 이들 세포내에는 탐식된 E coli와 라이소좀이 풍부하였다. 간질에도 호중구와 대식세포 및 소수의 림프구가 침윤되었으며 염증세포의 세질내에 탐식된 E coli가 많았다. 이러한 소견은 E coil 투여 후 2주에도 지속되었다. 그러나 3주 이후에는 호중구는 감소되었으며 대식세포, 림프구 및 형질세포가 증가되었고 간질에는 섬유아세포의 증식이 일어났다. 그리고 E coli는 거의 소실되었으나 단위막에 둘러싸인 간상소체가 선강 및 선방세포내에 있었다. 결론 : 이와 같이 전립선에서 E coli가 대부분 제거된 후에도 면역단백이 강하게 나타나는 것으로 보아 항원이 잔류해있음을 암시하며 항원의 지속적인 잔류가 만성 세균성 전럽선염을 유발하는 한 인자로 추정된다. This study was carried out to morphologically investigate the patogenesis of chronic bacterial pros-tatitis. Male Sprague-Dawley rats were inoculated 0.2㎖ of Escherichia coli(10^8cells/㎖) into the prostate and sacrificed 1, 2, 3, and 5 weeks after inoculation. Ten animals in each group were observed by light and electron micrscopy. In addition, immunocytochemistry for IgG, IgA, and IgM in the prostate was performed. On light microscopy, acute purulent inflammation occurred in the prostate with necrosis and sloughing of epithelial cells and severe infiltration of neutrophils and macrophages in the interstitium. Acute inflammation was persisted until 2 weeks after inoculation. In 3 weeks after inoculation atrophy and loss of prostatic acini and fibrosis of interstitium, which were signs of chronic prostatitis, appeared. Immunoglobulin IgG, IgA, and IgM were strongly positive in inflammatory cells and interstitium during the period of experiments. On electron microscopy, there were marked exudation of neutrophils and necrotic cells in the acini with focal necrosis of lining epithelium. Infiltration of neutrophils, and macrophages, deposition of fi brins, and marked congestion appeared in the interstitium at 1 week after inoculation of E. coli. These findings persisted for many weeks. There were membrane bound rod bodies in the lysosomes and cytoplasm of the epithelium. According to above results it is suggested that chronic bacterial prostatitis in this model was associated with persistent immunological reaction on the prostate resulting in chronic inflammation of the prostate.

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.

싸이클론 건식공정으로 생산된 재생 잔골재가 콘크리트의 기초특성에 미치는 영향

이문환,이세현 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2

This study is intended for how to utilize the recycled fine aggregate which is produced by concrete wastes. It analyses the quality of the fine aggregate which is reproduced through a dry production process with cyclone, and comprehends the characteristics of mortar using the recycled fine aggregate to review whether it can be put to practical use for concrete. In: the experiment, recycled fine aggregate is substitute for natural fine aggregate the rate of 0, 25, 50, 75 and 100% each. The results of the study are as follows. 1) The air content is increased irregularly according to the substitutive ratio of recycled fine aggregate. 2) The slump and loss of slump with time since mixing are decreased irregularly according to the substitutive ratio of recycled fine aggregate. 3) The compressive strength of concrete using the wet recycled fine aggregate tends to be reduced with the increase of the mixing ratio of recycled fine aggregate, but the compressive strength of 25% substitution ratio is increased. Based on the above results, it is concluded that the recycled fine aggregate through the wet production process can be used as fine aggregate on condition that the substitution ration is under 25%.

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.

와동형태의 설계에 따라 치아에 발생되는 응력의 변화에 관한 연구 : 1. 온레이의 경우

오세윤,김웅철,김지환 高麗大學校 倂設 保健大學 保健科學硏究所 1994 保健科學論集 Vol.20 No.1

Because of the anatomical form of posterior teeth, the amount of tooth reduction at the cuspal area in the typical intracoronal cavity will be inevitably maximal, while stress development on the restoration in this area will be relatively minimal. In an attempt to decrease the amount of tooth reduction at the cuspal area, two modified cavities were newly designed in this study. They had a decreased pupal depth of 1mm at the cuspal area and offsets with the depth of 0.5 ~ 1.0mm were formed at the central fossa area. The Von Mises stresses developed in the gold restoratives and in the teeth were compared with that in the typical intracoronal cavity, which had a simple flat pulpal floor with 1.5mm pulpal depth at the central fossa area. Stress analysis was done with two dimensional finite technique. The obtained results were as follows: 1. The newly modified cavity designs were found to be more advantageous in stress distribution. 2. The effect of offset depth was not significant, but some relationship between the offset depth and stress distribution was found.

치과 기공사들에게서 나타나는 호흡기 증상과 이의 관련 요인

김웅철,오세윤,김지환,김진완,이준석,이가영,이세훈,유진호,김태석 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

This study was carried out to investigate subjective respiratory symptoms and their attributable factors in Korean dental laboratory technicians. A questionnaire was mailed to randomly selected 1,900 dental laboratory technicians. Among them, 1,344 dental technicians completed the questionnaires and returmned them. Validity and reliability tests on the questionnaires were carried out before the main survey. To investigate risk factors on respiratory subjective symptoms, we performed analysis on distribution of characteristics, and then investigated univariate analysis and multiple logistic regression analysis. The prevalence rate of wheezing, cough and phlegm, and dyspnea was 4.8%, 33.9%, 54.9%, respectively. Statistically significant factors inducing subjective respiratory symptoms by multiple logistic regression analysis were sex, smoking, exercise, health examination, work hours a day, investment gas, investment dust, metal fume, resin vapor, and asbestos dust. Considering the results above, it seems that most subjective respiratory symptoms are related with health habits and occupational environmental-related factors. The result, consideration in mind, suggest that health promotion programs for smoking cessation, regular health examination, and physical exercise in health habit, and improvement on casting and resin work in dental technological environment be necessary.