低사이클 反引張을 받는 鋼棒의 圓孔노치底 크랙發生에 관한 硏究

孔基勳,吳世旭 東亞大學校 大學院 1981 大學院論文集 Vol.5 No.-

Many studies on fatigue crack propagation have been presented but the behavior of fatigue and its mechanism is not clarified enough yet, especially low cycle fatigue. Some experiments in this study were carried out by the method of changing stress amplitude under constant mazimum stress and low cycle pulsating tension fatigue testing on fatigue crack propagation at room temperature. Propagating cracks were observed with potical microscope on crack initiation and growth. The obtained results are summarized as follows: ⑴ Fatigue strength was higher in S-N curve as stress amplitude was decreasing, mean stress inereasing, too. ⑵ The initiation of fatigue crack was occured at 28~32% through the total fatigue life. ⑶ The summarized relationship between crack propagation rate and stress intensity factor of structural steel (SM45C) is as follows. The value of exponent m was 1.41-1.85. ⑷ Propagating crack in fatigue generally passed along grain boundaries and ferrite matrix, it passed around and branched cause of hard inclusion. ⑸ In the case of higher stress amplitude the shpae of crack propagation and fracture surface was intricate.

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.

접착제와 와동형성의 차이에 따른 5급 복합레진 수복의 전향적 임상연구

이경욱,정세준,한영철,손호현,엄정문,오명환,조병훈 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.4

본 연구의 목적은 복합레진을 이용한 비우식성 치경부 5급 병소 수복에 있어서, 3가지 다른 접착제를, 유지구를 부여한 치아와 부여하지 않은 치아에 적용하였을 때의 임상적인 효능의 차이를 비교하기 위함이다. 총 150개의 치아를 각각 25개씩 6개의 군으로 나누었다. A군 Scotchbond Multi-Purpose (SBMP, 3M ESPE, St, Paul, MN, USA, 4세대 접착제)를 사용하고 유지구를 부여하지 않음. B군: SBMP를 사용하고 유지구를 부여. C군: BC Plus (Vericom Co., Anyang, Gyeonggido, Korea, 5세대 접착제)를 사용하고 유지구를 부여하지 않음. D군: BC Plus를 사용하고 유지구를 부여. E군: Adper Prompt (3M ESPE, Seefeld, Germany, 6세대 접착제)를 사용하고 유지구를 부여하지 않음. F군: Adper Prompt를 사용하고 유지구를 부여. 모든 치아는 복합레진인 Denfil(Vericom Co., Anyang. Gyonggido. Korea)을 이용하여 충전하였다. 수복 직후와, 수복 6개월 후에 modified USPHS (United States Public Health Service) criteria에 따라 수복물을 임상적으로 평가하였다. 추가적으로 임상사진을 촬영하였으며, 에폭시 레진을 이용하여 복제한 후 주사전자현미경을 이용하여 이를 관찰하였다. 6개월 후 관찰 결과. alpha rating의 수가 각 실험군마다 동일하지는 않았지만, 통계적으로는 3가지의 접착제간에 유의할만한 차이는 없었고, 기계적인 유지구를 부여한 군과 부여하지 않은 군 간에도 유의할만한 차이는 없었다 (p > 0.05). 그러나 6개월의 관찰 기간은 일반적으로 기대되는 레진의 수명보다 짧기 때문에, 각 실험군 간의 차이를 알아보기 위해서는 추후 더 오랜 기간의 관찰이 요구된다. The purpose of this study is to evaluate prospectively the effect of different bonding systems and retention grooves on the clinical performance of resin restorations in non-carious cervical lesions (NCCLs). Thirty nine healthy adults who had at least 2 NCCLs in their promolar areas were included in this study. One hundred and fifty teeth were equally assigned to six groups; (A) Scotchbond Multi-Purpose (SBMP, 3M ESPE, St, Paul, MN, USA, 4th generation bonding system) without retention grooves; (B) SBMP with retention grooves: (C) BC Plus (Vericom Co., Anyang, Gyeonggido, Korea, 5th generation bonding system) without retention grooves; (D) BC Plus with retention grooves; (E) Adper Prompt (3M ESPE, Seefeld, Germany, 6th generation bonding system) without retention grooves: (F) Adper Prompt with retention grooves. All cavities were filled with a hybrid composite resin, Denfil (Vericom Co., Anyang, Gyeonggido, korea) by one operator. Restorations were evaluated at baseline and at 6-month recall, according to the modified USPHS (United states Public Health Service) criteria, Additionally, clinical photographs were taken and epoxy resin replicas were made for SEM evaluation. At 6-month recall, there were some differences in the number of alpha ratings among the experimental groups. But, despite the differences in the number of alpah ratings, there was no significant difference among the 3 adhesive systems (p > 0.05). There was also no significant difference between the groups with or without mechanical retention (p > 0.05). Follow-ups for longer periods than 6 months are needed to verify the clinical performance of different bonding systems and retention grooves. 〔J Kor Acad Cons Dent 31(4):300-311, 2006〕

韓國人의 各 臟器組織中 靑酸鹽의 微量分布에 關한 硏究(Ⅱ)

張成吉,金恩浩,金英雲,李鎭勳,柳在薰,權五星,金明德,吳世珍,金由那 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

生體血의 保存環境과 腐敗産物에 依한 血中알콜濃度變化에 關한 硏究

張成吉,金英雲,柳在薰,吳世珍,權五星,朴世延 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

요와 농 검체에서의 Vancomycin 내성 장구균 분리 2예

김성규,김문정,권오헌,김준명,정석훈,정윤섭,이경원,전세일 대한감염학회 1996 감염 Vol.28 No.4

65세 여자 환자의 요 검체에서 vancomycin 내성 E. faecalis를, 욕창의 농에서 vancomycin 내성 E. faecium을 분리하였는데, 환자의 병력으로 미루어 미국에서 정착된 세균에 의하여 감염되었을 것으로 생각되었다. 분리 균주에 대한 vancomycin의 MIC는 각각 258과 32㎍/mL, teicopoanin은 0.25, 0.5㎍/mL이어서 VanB 표현형으로 추측되었다. 우리 나라에서의 VRE 확산을 예방하기 위한 조치의 일환으로서 의사를 포함한 병원 직원에게 VRE 감염증의 심각성을 홍보하여야 하며, 미생물검사실에서는 임상검체에서 분리된 장구균의 vancomycin 내성을 시험하고 장내 VRE 보균자의 주기적 검색이 필요하다고 사료되었다. Vancomycin-resistant Enterococcus faecalis and E. faecium were isolated from urine and decubitus ulcer discharge, respectively, from a 65-year-old woman. Proir to the transfer to this hospital in December, 1995, she had been admitted to the Chicago Rehabilitation Center in the U.S. for the treatment of olivopontocerebellar atrophy, quadriplegia, and neurogenic bladder. She was also treated with multiple antimicrobials including vancomycin for pneumonia at intensive care unit, which suggested that she acquired the organisms in the U.S. The minimal inhibitory concentrations of vancomycin and teicoplanin against the isolates were: E. faecalis 256 ㎍/mLand 0.5㎍/mL; E. faecium 32 ㎍/mL and 0.5 ㎍/mL, respectively. The susceptibility patterns suggest the isolates are vanB type. Although other species of vancomycin-resistant Enterococcus spp. were reported previously in Korea, these isolates may be the first vancomycin-resistant E. faecalis and E. faecium from clinical specimens.

Effects of Long-acting Injectable 3-Monthly Paliperidone Palmitate on the Clinical and Social Performance of Patients with Schizophrenia

Jihoon Oh(Jihoon Oh),Jihye Oh(Jihye Oh),Dong Wook Kim(Dong Wook Kim),HyunChul Youn(HyunChul Youn),Sae-Hoon Kim(Sae-Hoon Kim),Soo In Kim(Soo In Kim),In Won Chung(In Won Chung),Kuan Shu Wang(Kuan Shu Wa 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1

Objective: To investigate the effects of long-acting injectable 3-monthly paliperidone palmitate on the clinical and social functioning of patients with schizophrenia. Methods: This study enrolled patients with schizophrenia receiving long-acting injectable 1-monthly paliperidone palmitate for at least 4 months and who subsequently received 3-monthly paliperidone palmitate. Accordingly, 418 patients were followed up for 24 weeks. Their clinical symptoms and social functioning were measured using the Clinical Global Impression-Severity of Illness and Personal and Social Performance scales. Results: The Personal and Social Performance total score was significantly higher after 3-monthly paliperidone palmitate treatment than at baseline (baseline vs. week 24: 54.3 ± 18.0 vs. 61.0 ± 14.5 [mean ± standard deviation]; p < 0.001; Wilcoxon signed-rank test); the proportion of patients in the mildly ill group (scores 71−100) also increased significantly (baseline vs. week 24: 16.5% vs. 20.6%; p < 0.001; McNemar-Bowker test). The mean Clinical Global Impression-Severity of Illness score decreased significantly (baseline vs. week 24: 3.7 ± 1.0 vs. 3.4 ± 0.9; p < 0.001; Wilcoxon signed-rank test), as did the proportion of patients in the severely ill group (baseline vs. week 24: 4.1% vs. 2.1%; p < 0.001; McNemar-Bowker test). Conclusion: Continuous 3-monthly paliperidone palmitate treatment significantly enhances the personal and social performance of patients with schizophrenia and reduces the proportion of those with severe illness. These findings suggest that long-acting injectable antipsychotic administration at intervals longer than 1 month might improve the social functioning of and promote return to activities of daily living in patients with schizophrenia.

배수성 Single-Piece Acryl 인공수정체의 백내장 수술 후 임상 결과

오세훈 ( Sae Hoon Oh ) , 김정권 ( Jung Kweon Kim ) , 이도형 ( Do Hyung Lee ) 대한안과학회 2004 대한안과학회지 Vol.45 No.12

특허와 히트 상품

오세훈(Oh Sae Hoon) 인하대학교 법학연구소 2007 法學硏究 Vol.10 No.4

각막 윤부에 발생한 연소성 황색 육아종 1예

오세훈 ( Sae Hoon Oh ) , 오재룡 ( Jae Ryong Oh ) , 나태윤 ( Tae Yoon La ) , 이도형 ( Do Hyung Lee ) 대한안과학회 2003 대한안과학회지 Vol.44 No.4