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Pham, Thanh-Dong,Lee, Byeong-Kyu,Nguyen, Van Noi,Dao, Van-Duong Elsevier 2017 Journal of catalysis Vol.352 No.-
<P>This article has been retracted: please see Elsevier Policy on Article Withdrawal (<U>https://www.elsevier.com/about/our-business/policies/article-withdrawal</U>).</P><P>This article has been retracted at the request of the Editor, after consultation with the corresponding author Professor Byeong-Kyu Lee due to the methods described in the paper for the preparation of the catalysts being incomplete and the results not being reproduced. This was brought to the editors’ attention via a letter to the editor. Professor Lee agreed that the methods description was not complete and agreed with this course of action. <Journal of catalysis, 352 (2017) 13 – 21>, http://dx.doi.org/10.1016/j.jcat.2017.04.024.</P>
수종의 내부연결형 임플란트에서 연결부의 형태에 따른 응력분포의 유한요소 분석
정병현,이경제,강동완 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.2
Purpose: This study was performed to compare the stress distribution pattern of abutment-fixture connection area using 3-dimensional finite element model analysis when 5 different implant systems which have internal connection. Materials and methods: For the analysis, a finite element model of implant was designed to locate at first molar area. Stress distribution was observed when vertical load of 200 N was applied at several points on the occlusal surfaces of the implants, including center, points 1.5 mm, 3.0 mm away from center and oblique load of 200 N was applied 30º inclined to the implant axis. The finite element model was analyzed by using of 3G. Author (PlassoTech, California, USA). Results: The DAS tech implant (internal step with no taper) showed more favorable stress distribution than other internally connected implants. AS compare to the situations when the loading was applied within the boundary of implants and an oblique loading was applied, it showed higher equivalent stress and equivalent elastic strain when the loading was applied beyond the boundary of implants. Regardless of loading condition, the abutments showed higher equivalent stress and equivalent elastic strain than the fixtures. Conclusion: When the occlusal contact is afforded, the distribution of stress varies depending on the design of connection area and the location of loading. More favorable stress distribution is expected when the contact load was applied within the diameter of fixtures and the DAS tech implant (internal step with no tapering) has more benefits than the other design of internally connected implants. 연구 목적: 본 연구는 3차원 유한요소분석을 통해 특징적인 내부연결구조를 갖는 5종의 임플란트의 고정체와 지대주의 연결방식에 따른 응력분산을 알아보고자 하였다. 연구 재료 및 방법: 본 실험을 위한 유한요소모델은 하악 제1대구치부에 임플란트가 식립되고 상부구조물로 3형 금합금을 사용하는 것으로 가정하였다. 응력분산은 200 N의 하중이 교합면의 중심, 중심에 1.5 mm 외측, 중심에서 3.0 mm 외측에 수직으로 가해지고 임플란트의 장축과 30º의 각도로 경사하중이 가해지도록 하여 분석하였다. 유한요소모델에 대한 해석작업은 3G.Author (PlassoTech, California, USA)를 사용하여 이뤄졌다. 결과: 경사가 없는 내부계단 구조를 가지는 DAS tech의 임플란트의 경우, 내부연결구조를 갖는 다른 임플란트에 더 유리한 응력분산을 보였다. 하중이 임플란트 고정체의 외형선 이내에 가해지는 경우와 비교하여 외형선 바깥이나 경사력으로 전해지는 경우 더 높은 응력을 보였으며 하중조건과 관계없이 임플란트 고정체보다는 지대주에 더 큰 응력이 집중되었다. 결론: 교합력이 가해졌을 때 응력분산은 임플란트의 연결부의 형태와 하중이 가해지는 위치에 따라 달라졌으며 내부계단 구조를 가지는 DAS tech의 임플란트를 사용한 경우와 고정체의 외형선 이내에 하중이 가해졌을 경우에 더 유리한 응력분산을 보였다.
이병익,김진표,김종필,노동연 龍仁大學校 體育科學硏究所 2001 體育科學硏究論叢 Vol.11 No.1
The purpose of this research is to analyze the relations between on high-school teacher's participation in leisure activities and job attitude, and its conclusion is like as follows. First, high-school teachers' job satisfaction difference based on environment variables showed statistically no significant difference on the level of 5% in terms of sex and age. And as for devotion to the organization, it showed statistically significant difference on the level of 5% in terms of age, but no significant difference in terms of sex. Secondly, with the regard to high-school teachers' types of leisure activities, it showed statistically no important difference on the level of 5% in terms of both job satisfaction and devotion to the organization. Thirdly, for high-school teachers' job satisfaction depending on their participation time for leisure activities, it saw statistically significant difference on the level of 5%, and as for devotion to the organization, it saw no significant difference. Fourthly, for high-school teachers' job satisfaction depending on the frequency of leisure activities, it showed statistically significant difference on the level of 5%, but as for devotion to the organization, it showed no significant difference. Fifthly, the correlation(γ) among the variables ranged from -.128 to .542. And with 1.7% of explainable, βof job satisfaction is like these: participation time for leisure activities(.108); types of leisure activities(.057); and frequency of leisure activities(.055). As for βof devotion to the organization, with 2.2% of explainable, is like these: participation time for leisure activities(.118); frequency of leisure activities(.091); and types of leisure activities(-.062).
Ti-3Al-2.5V 합금의 피로특성 : 온도, 미세조직의 영향을 중심으로 The Effects of Temperature and Microstructure
박동준,김현철,임병수 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
Ti alloys, with the advantageous tensile strength/density ratio and the chemical stability, have been used widely in the aerospace and chemical engineering industries and their usages are still expanding in various industrial areas. In the automotive industry, because of their superior merits of weight reduction and fuel saving, Ti alloys are expected to be used as various part materials including connecting rods, engine valves, springs and retainers, which are all subjected to the fatigue loads. In this study, using Ti-3A1-2.5V alloy, the effects of temperature and microstructure change on fatigue crack propagation have been investigated.
김동헌,장병춘,신규철,이재성 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-
The arthroscopic surgery is an increasingly accepted procedure for the treatment of symptomatic arthritic knee. Authors reviewed the operative results of arthroscopic surgery in 35 knee joints of 27 patients from 1993 to 1997. 1. The average age of patients was 64 years old and the primary diagnosis was degenerative osteoarthritis in all patients. 2. Preoperative symptomes and signs were pain(98%), tenderness(85%), swelling(85%), decreased range of motion(71%) and effusion(55%). 3. The operative procedures were irrigation and synovectomy(20%), abrasion arthroplasty(57%), partial menisectomy and abrasion arthroplasty(23%). 4. The symptoms and signs were improved postoperatively: according to Nine point scale, the good results were recorded at postoperative 6 months and follow-up 2 years in nearly all patients. 5. The complications were minimal. Authors concluded that arthroscopic surgery is considered as a reliable method in the treatment of degenerative osteoarthritis of the knee but not as a curable method, needing a long term observation.
임상가를 위한 외상후 스트레스 장애 척도의 신뢰도, 타당도 연구
이병용,김임,이선미,은헌정,김동인,김지연 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.3
연구목적 : 본 연구의 목적은 임상가를 위한 외상후 스트레스 장애 척도의 신뢰도와 타당도를 알아보고자 하는 것이다. 방 법 : 28명의 PTSD 군, 30명의 Non-PTSD군, 36명의 정상군에 대하여 임상가를 위한 외상후 스트레스 장애 척도를 실시하였다. 면담자간 신뢰도를 평가하기 위하여 10명의 외상후 스트레스 장애 환자를 2명의 검사자가 동시에 평가하였다. 타당도를 평가하기 위하여 모든 피검자들을 대상으로 사건 충격 척도, Beck의 우울 검사, Spielberger의 상태 특성 불안 검사 Ⅰ, Ⅱ를 시행하였다. 결 과 : Cronbach's α와 면담자간 일치도는 각각 .95와 .89였다. 임상가를 위한 외상후 스트레스 장애 척도는 각각 사건 충격 척도(r=.80), Beck의 우울 검사(r=.70), Spielberger의 상태 특성 불안 검사 Ⅱ(r=.56)와 높은 상관을 가지고 있었다. 그러나 Spielberger의 상태 특성 불안 검사 Ⅰ(r=.20)과는 상관을 보이지 않았다. 임상가를 위한 외상후 스트레스 장애 척도는 임상 진단과 82.1%의 일치도를 보였다. 결 론 : 임상가를 위한 외상후 스트레스 장애 척도는 충분한 신뢰도와 타당도를 가지고 있었다. 임상가를 위한 외상후 스트레스 장애 척도는 외상후 스트레스 장애를 진단하기에 유용한 도구라 할 수 있다. Objectives : The purpose of this study was to examine the reliability and validity of A Clinician-Administered PTSD Scale (CAPS). Methods : CAPS was administered to 28 PTSD subjects, 30 non-PTSD subjects, and 36 normal subjects, Interrater reliability for the CAPS was established by interviewing 10 PTSD subjects. The interviews were conducted by 2 interviewers simultaneously. The authors administered to all the subjects Impact of Event Scale(IES), Beck Depression Inventory(BDI), State Trait Anxiety InventoryⅠ, Ⅱ(STAI-I, Ⅱ) for measuring concurrent validity. Results : The value of Cronbach's α and interrater agreement were .95 and .89, respectively. The CAPS was highly correlated with IES(r=.80), BDI(r=.70), STAI-Ⅱ(r=.56). But the CAPS was not correlated with STAI-I(r=.20). The CAPS showed an overall agreement with clinical diagnosis of 82.1%. Conclusions : The CAPS shows a reasonable degree of reliability and validity. The CAPS could be a valuable tool to diagnose PTSD.
노년의 대퇴골 원위부 골절 시 동시에 시행한 전슬관절 성형술 및 금속판 내고정술 : 8예 보고 Report of Eight Cases
김동헌,장병춘,신규철,양준호 건국대학교 의과학연구소 1999 건국의과학학술지 Vol.9 No.-
Supracondylar fracture of the femur can be treated by a wide variety of methods. Although satisfactory results have been achieved with either open and closed treatment, less certain results are obtained for the elderly who have pre-existing osteoarthritis and osteoporosis. Particularly, elderly patients who have preexisting osteoarthritis are at increased risk of posttraumatic arthritis, stiff knee, persistent pain. Primary total knee arthroplasty(TKA) might obviate many of these potential problems and help to return the high-risk patient to an ambulatory functional status immediately. There are few reports about this study. The purpose of this study is to evaluate the results treated by simultaneous internal fixation and TKA for the supracondylar fracture in the elderly who have osteoarthritis of the knee joint. From 1994 to 1998, eight primary TKAs using posterior cruciate sparing PFC knee(Press Fit Condylar, Johnson & Johnson, Raynham, U.S.A) were performed after internal fixation for the supracondylar fracture of the femur with Judet plate or condylar buttress plate by conventional means. Patella was not resurfaced in all knees. According to the M ller classification of the supracondylar fracture of the femur 5 fractures were type A, 2 in type B, 1 in type C. Five patients were female, 3 patients were male. The ages ranged from 66 to 81, with an average of 74 years. Patients were followed for at least 1 year(average 3 years). The mean interval between the injury and operation was 2 weeks(range, 1 week to 4 weeks). Active knee joint exercise was encouraged in a hinge brace under the postoperative pain control. Partial weight bearing was permitted at the postoperative 4 to 6 weeks using crutches. Full weight bearing was allowed after union of the fracture. Fractures were united in all patients and the average duration of bony union was 16 weeks. The average amount of flexion and average flexion contracture for the all patients at the most recent follow-up were 96 degrees (range, 45 to 120 degrees) and 7 degrees (range, zero to 20 degrees), respectively. Using the knee rating score advocated by the American Knee Society, the average postoperative score was 87 for pain and 80 for function. We concluded that simultaneous internal fixation and TKA for supracondylar fracture of the femur in elderly patients who have advanced knee osteoarthritis may provide satisfactory pain relief and function with acceptable morbidity.
이온교환체로서 Polyphenylene Sulfide Sulfonic Acid에 관한 연구
전병광,손원근,서구원,맹학영,김동철,송해영 충남대학교 공업교육연구소 1994 論文集 Vol.17 No.1
Sulfonated poly(phenylene sulfide)(S-PPS) was prepared by the reaction of poly(phenylene sulfide)(PPS) with fuming sulfuric acid. The sulfonation was confirmed by the high intensity band of the SO_3H group at 1190 cm^-1. Thermally crosslinked S-PPS was used for a cation exchange polymer with high thermal stability. The ion exchange capacity of soluble S-PPS(H-form) and insoluble S-PPS(H-form) was 5.16meq/g and 3.50meq/g, respectively. The ion exchange capacity and IR absorbance at 1190cm^-1 of S-PPS were decreased as the curing temperature was increased.
2급 와동 수복 시 한국 치과 의사들의 복합레진 사용 실태 연구
신동호,박세은,양인석,장주혜,이인복,조병훈,손호현 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2
본 연구는 2008년 1월 현재 한국 치과의사들의 복합레진 사용 실태에 관한 설문 조사로서, 2급 와동을 수복하는 증례에서 치과의사의 면허 년도, 교육 배경 및 진료환경 등에 따라 수복재료의 선택, 복합레진의 사용여부 및 사용방법, 문제점 등을 비교하였다. 한국 치과의사들을 대상으로 2급 와동 수복에 관한 17 문항의 설문지를 제작하였다. 이 설문지는 시술자 정보 2급 와동의 수복으로 크게 2부분으로 나누어진다. 이 설문지는 대한치과의사협회를 통해 12.193 명의 치과의사들에게 E-메일로 발송되었다. 이 중 2.612개의 메일이 수신 확인되었고 840 개의 설문지가 작성되어 회신되었다. 수신 확인된 메일 수에 대한 회신된 메일 수의 비율 (회신율)은 32.2%이었고, 이 자료는 SPSS프로그램에서 카이제곱 분석을 이용하여 교차 분석하였다. 답변자의 비율은 면허년도를 기준으로 1998 ~ 2007년에 면허를 취득한 그룹 (한국 전체 치과의사의 33 3%, 추정 년령 26-35세)이 60.3%로 1997년 이전에 면허 취득한 그룹 (한국 전체 치과의사의 66.7%.추정 년령 36세 이상)의 39.7%보다 높은 것으로 나타났다. 또한 이들이 근무하는 병원은 개인의원 (77%)이 가장 많았고 남자 치과의사(79%)가 많았다. 복합레진 수복에 대한 지식은 학생 때 수업이나 학회, 세미나를 통하여 (83.4%) 얻은 것으로 나타났다. 2급 와동 수복 시 재료 선호도를 살펴보면 금인레이가 65.7%를 차지하고 있고 복합레진 직접 수복은 12.1%로 낮게 나타났다. 2급 와동의 복합레진 직접 수복 시 시술 방법에 있어서는 러버댐을 사용하지 않거나 잘 사용하지 않는 그룹의 비율(74.4%)이 더 많았고. 격벽법으로는 mylar strip (53.4%)이나 metal matrix (33.8%), Palodent svstem (6.5%)를 사용하였다. 충전은 적층법 (99.6%)을 사용하는 것으로 나타났으며, 시술 시 인접면 형성을 가장 어려워하였다.(57.2%). 2-step 접착시스템 (76%)이 3-step 접착시스템 (16%)보다 많이 사용되고 있었다. 사용하는 레진 제품으로는 Z250(20%)이 가장 많이 사용되고 있었다. The purpose of this study was to assess the current materials, methods and difficulties according to the year of licence and educational background of Korean dentists in Class Ⅱ direct composite resin restorations. Total 17 questions were included in the questionnaire. Questions were broadly divided into two parts first, operator's information and second the materials and methods used in Class Ⅱ posterior composite restoration. The questionnaire was sent to dentists enrolled in Korean Dental Association via e-mail. Total 12,193 e-mails were distributed to dentists. 2,612 e-mails were opened and 840 mails (32.2%) were received from respondents. The data was statically analyzed by chi-square test using SPSS(v 120.1 SPSS Inc. Chicago. IL USA). Male dentists among respondents was 79% 60.3% of the respondents acquired their licences recently (1998-2007) and 77% practiced in private offices 83.4% have acquired their knowledge through school lectures conferences and seminars. For the Class Ⅱ restorations gold inlays were preferred by 65.7% of respondents while direct composite resin restorations were used by 12.1% amalgam users were only 4.4% of respondents. For the restorative technique 74.4% of respondents didn't use rubber dam as needed. For the matrix. mylar strip (53.4%), metal matrix (33.8%) and Palodent system (6.5%) were used 99.6% of respondents restored the Class Ⅱ cavity by incremental layering. Obtaining of the tight interproximal contact was considered as the most difficult procedure (57.2%) followed by field isolation (21%). Among various bonding systems, 22. 6% of respondents preferred SE Bond and 20.2% used Single Bond. Z-250 was used most frequently among a variety of composite resins.