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하악 중심위 유도방법에 따른 하악위의 재현성 및 변위량에 관한 비교연구(LEAF GAUGES의 사용을 중심으로)
최진웅,최대균,박남수,최부병,Choi, Jin-Woong,Choi, Dae-Gyun,Park, Nam-Soo,Choi, Boo-Byung 대한치과보철학회 1988 대한치과보철학회지 Vol.26 No.1
The objectives of this study were to compare the position of centric relation guided by means of leaf gauges, bilateral manipulation, chin-point guidance with Lucia jig and self-guided method and the reproducibility, respectively. A Veri-check (Denar Co., Anaheim, California) was employed for examining, and the displacement of position and reproducibility were verified. The following results were obtained. 1. On the sagittal plane, the centric relation guided by means of leaf gauges showed greater posterior displacement than that by means of bilateral manipulation and less than that by means of chin-point guidance with Lucia jig, and self-guided centric relation showed least posterior displacement. The centric relation guided by means of bilateral manipulation showed greater superior displacement than that by means of chin-point guidance with Lucia jig and less than that by means of leaf gauges and self-guided centric relation showed least superior displacement. 2. On the horizontal plane, the centric relation guided by means of chin-point guidance with Lucia jig showed greater posterior displacement than that of bilateral manipulation and less than that leaf gauges, however the self-guided centric relation showed slightly anterior displacement. 3. The anteroposterior displacement measured on sagittal plane and horizontal plane were highly correlated. (p<0.05). 4. The reproducibility of centric relation guided by means of leaf gauges, bilateral manipulation and chin-point guidance with Lucia jig were similar and more reproducible than self-guided centric relation.
콘크리트 교량의 합리적인 보수·보강 필요성 판단 기준에 관한 사례 연구
최진웅,이상승,한정헌,박선규 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
This research is to make a decision making code of repair and strengthening for a reasonable decision through the case studies of overseas. First, to make decision making code, the guidelines and code for a decision making of repair and strengthening and facilities state assessment in United States and Japan were investigated and analyzed. According to the investigation and analysis, the guidelines and code to help on the decision of repair and strengthening were existed, and repair and strengthening are done reasonably. Therefore in Korea, decision making code or guidelines on repair and strengthening is needed.
멤리스터 기반 미분 및 적분제어 회로에서의 커패시턴스 변화에 따른 히스테리시스 곡선 특성 분석
최진웅,모영세,송한정,Choi, Jin-Woong,Mo, Young-Sea,Song, Han-Jung 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.10
This paper presents an electrical feature analysis of hysteresis curves in memristor differential and intergral control circuit. After making macro model of the memristor device, electric characteristics of the model such as time analysis, frequency dependent DC I-V curves were performed by PSPICE simulation. Also, we made a circuit of memristor-capacitor based on nano-wired memristor device and analyzed the simulated PSPICE results. Finally, we proposed a memristor based differential or integral control circuit, analyzed hysteresis curve characteristic in the control circuit.
Holographic Interferometry를 이용한 하악 구치부 도재소부 전장관용 금속 구조물의 굴곡성향에 대한 연구
최진웅,우이형,최부병,Choi, Jin-Woong,Woo, Yi-Hyung,Choi, Boo-Byung 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.4
Flexion of a metal/ceramic fixed partial denture(EPD) frameworks under function can cause fracture of porcelain or deterioration of the cement seal. This study evaluated the flexion characteristics of three-unit mandibular FPD frameworks, repacing the second pre-molar under compressive load(200g, 400g). Testing was accompished with real-time holographic interferometry, using 6 porcelain fused-to metal frameworks. Tested alloys were non-precious alloy(Heracles, Holland), semi-precious alloy(Degudent U, Germany) and precious alloy(Degudent H, Germany). Changes of the fringe patterns according to the heat treatment(porcelain firing cycle), various loads(200g, 400g), occlusal forms(occlusal porcelain veneering, facial porcelain veneering), various alloys and post-soldering units were compared. Dental study model(Nissan dental products, Inc. D51DP-500A, Japan) and six 3-unit metal/ceramic fixed partial denture frameworks were used as experimental materials. 36 holograms were taken on fixed dental study model by using the 10mW He-Ne laser and real-time holographic interferometry. On the basis of this study, the following conclusions can be drawn : 1. In the frameworks for facial porcelain veneering, the semi-precious alloy framework was least deformed and precious alloy framework, non-precious alloy framework orderly before heat treatment, and the deformation was not shown great difference among three alloys after heat treatment and post-soldering. 2. In the frameworks for occlusal porcelain veneering, the precious alloy framework was greatest deformed and the deformation was not difference between semi-precious alloy framework and non-precious alloy framework before, after heat treatment, and the deformation was not shown great difference among three alloys after post soldering. 3. In the non-precious alloy frameworks for facial porcelain veneering and occlusal porcelain veneering, the deformation was greatly decreased after heat treatment and conversely increased after post-soldering. 4. In the semi-precious alloy framework for facial porcelain veneering, the deformation was not detectable after heat treatment and increased after post-solder. And in the frame-work for occlusal porcelain veneering, the deformation was slightly decreased after heat treatment and increased after post-soldering. 5. In the precious alloy framework for facial porcelain veneering, the deformation was greatly decreased after heat treatment and increased after post-soldering, And in the framework for occlusal porcelain veneering, the deformation was greatly decreased after heat treatment and decreased after post-soldering.
유공형 강판으로 전단보강된 넓은 보에서의 횡방향 보강 간격에 따른 전단성능 평가
최진웅,김민숙,최봉섭,이영학,김희철,Choi, Jin Woong,Kim, Min Sook,Choi, Bong-Seob,Lee, Young Hak,Kim, Heecheul 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.3
본 논문에서는 유공형 강판의 횡방향 보강간격에 따른 넓은 보의 전단성능을 실험적으로 평가하기 위하여 횡방향 전단보강 간격과 넓은 보의 유효깊이를 변수로 고려하였다. 시험체는 총 8개로 유공형 강판으로 전단보강한 시험체가 5개, 무보강 시험체가 3개이다. 균열 및 파괴유형, 변형률과 하중-변위 곡선을 분석하였다. 유공형 전단보강재의 전단강도 기여분을 분석하고, 횡방향 전단보강의 최대간격을 제안하였다. 횡방향 전단보강 개수가 2개인 시험체에 비해 3개인 시험체에서 전단강도가 크게 나타났으며 유효깊이가 증가할수록 전단강도가 크게 나타났다. In this paper, transverse shear spacing and effective depth of wide beams were considered as parameters to evaluate the shear capacity of wide beam according to transverse spacing of steel plates with openings in experimental way. The eight specimens were composed of: five specimens of shear reinforced by steel plates with openings and three non-reinforced specimens. Crack, failure mode, strain and load-displacement curve of specimens were analysed. Shear contribution of shear reinforcement is evaluated and maximum transverse spacing of shear reinforcement was proposed. Shear strength of the specimen that reinforced with three stirrup legs was higher than shear strength of the specimen that reinforced with two stirrup legs. And as the effective depth increased, shear strength was increased.
최진웅 ( Jinwoong Choi ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
PSC Box 거더교(이하, PSCB 거더교)는 장경간·고교각 교량이 대부분이며 접근의 한계로 거더 외부 육안조사 및 박스내부 조사에 어려움이 있다. PSCB 거더교는 상·하부 플랜지와 복부판이 일체화된 폐합된 BOX 단면으로 일반적인 교량과는 구조적 특성과 유지관리 특성이 상이함으로 이를 고려한 유지관리 방안이 수립되어야 한다. 본 연구에서는 고속도로에서 공용되는 PSCB 거더교의 상부플랜지 열화·손상 사례를 조사·분석 하였으며, 열화·손상 발생 원인을 규명하였다. 이를 바탕으로 PSCB 거더교의 특성을 고려한 유지관리 개선사항을 설계·시공·유지관리 단계별로 도출하였다.
최진웅 ( Jinwoong Choi ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
PSC Box 거더교(이하, PSCB 거더교)는 장경간·고교각 교량이 대부분이며 접근의 한계로 거더 외부 육안조사 및 박스내부 조사에 어려움이 있다. PSCB 거더교는 상·하부 플랜지와 복부판이 일체화된 폐합된 BOX 단면으로 일반적인 교량과는 구조적 특성과 유지관리 특성이 상이함으로 이를 고려한 유지관리 방안이 수립되어야 한다. 본 연구에서는 고속도로에서 공용되는 PSCB 거더교의 상부플랜지 열화·손상 사례를 조사·분석 하였으며, 열화·손상 발생 원인을 규명하였다. 이를 바탕으로 PSCB 거더교의 특성을 고려한 유지관리 개선사항을 설계·시공·유지관리 단계별로 도출하였다.
최진웅 ( Jinwoong Choi ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
PSC Box 거더교(이하, PSCB 거더교)는 장경간·고교각 교량이 대부분이며 접근의 한계로 거더 외부 육안조사 및 박스내부 조사에 어려움이 있다. PSCB 거더교는 상·하부 플랜지와 복부판이 일체화된 폐합된 BOX 단면으로 일반적인 교량과는 구조적 특성과 유지관리 특성이 상이함으로 이를 고려한 유지관리 방안이 수립되어야 한다. 본 연구에서는 고속도로에서 공용되는 PSCB 거더교의 상부플랜지 열화·손상 사례를 조사·분석 하였으며, 열화·손상 발생 원인을 규명하였다. 이를 바탕으로 PSCB 거더교의 특성을 고려한 유지관리 개선사항을 설계·시공·유지관리 단계별로 도출하였다.