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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.
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.
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.
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.
커패시터 멀티플라이어를 갖는 CCM/DCM 이중모드 DC-DC 벅 컨버터의 설계
최진웅(Jin-Woong Choi),송한정(Han-Jung Song) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.9
본 논문에서는 휴대 전자기기의 내부 전원단을 위한, CCM/DCM 기능의 이중모드 감압형 DC-DC 벅 컨버터를 제안한다. 제안하는 변환기는 1 MHz의 주파수에서 동작하며, 파워단과 제어블럭으로 이루어진다. 파워단은 Power MOS 트랜지스터, 인덕터, 커패시터, 제어 루프용 피드백 저항으로 구성된다. 제어부는 펄스폭 변조기 (PWM), 오차증폭기, 램프 파 발생기, 오실레이터 등으로 이루진다. 또한 본 논문에서 보상단의 큰 외부 커패시터는, 집적회로의 면적축소를 위하여 CMOS 회로로 구성되는 멀티플라이어 등가 커패시터로 대체하였다. 또한,. 본 논문에서, 보상단의 외부 커패시터는 집적회로의 면적을 줄이기 위하여 곱셈기 기반 CMOS 등가회로로 대체하였다. 또한 제안하는 회로는 칩을 보호하기 위하여 출력 과전압, 입력부족 차단 보호회로 및 과열 차단 보호회로를 내장하였다. 제안하는 회로는 0.18 ㎛ CMOS 공정을 사용하여, 케이던스의 스펙트라 회로설계 프로그램을 이용하여 설계 및 검증을 하였다. SPICE 모의 실험 결과, 설계된 이중모드 DC-DC 벅 변환기는 94.8 %의 피크효율, 3.29 mV의 리플전압, 2.7 ~ 3.3 V의 전압 조건에서 1.8 V의 출력전압을 보였다. This paper presents a step-down DC-DC buck converter with a CCM/DCM dual-mode function for the internal power stage of portable electronic device. The proposed converter that is operated with a high frequency of 1 ㎒ consists of a power stage and a control block. The power stage has a power MOS transistor, inductor, capacitor, and feedback resistors for the control loop. The control part has a pulse width modulation (PWM) block, error amplifier, ramp generator, and oscillator. In this paper, an external capacitor for compensation has been replaced with a multiplier equivalent CMOS circuit for area reduction of integrated circuits. In addition, the circuit includes protection block, such as over voltage protection (OVP), under voltage lock out (UVLO), and thermal shutdown (TSD) block. The proposed circuit was designed and verified using a 0.18 ㎛ CMOS process parameter by Cadence Spectra circuit design program. The SPICE simulation results showed a peak efficiency of 94.8 %, a ripple voltage of 3.29 mV ripple, and a 1.8 V output voltage with supply voltages ranging from 2.7 to 3.3 V.
최진웅 ( Choi Jin-woong ),심재중 ( Shim Jae-jung ),박준명 ( Park Jun-myung ),홍성남 ( Hong Sung-nam ),박선규 ( Park Sun-kyu ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
The object of this study is to estimate shear strength of Perfobond Rib shear connectors were used by direct shear stress. To estimate shear strength, Perfobond Rib shear connector experiments were fabricated with four variables which are existence or nonexistence hole, number of holes, distance of hole and number of reinforcing bars and Push-out Tests were carried out on them. After experiments, mechanism of Perfobond Rib shear connector was examined. The result of experiments, primary factors which influence direct shear strength are point bearing capacity of Perfobond Rib shear connector, effect of concrete dowels and effect of reinforcing bars. Lastly, based on primary facors, direct shear strength formula was proposed.
Perfobond Rib 전단연결재를 사용한 강합성바닥판의 전단강도 평가
최진웅(Choi, Jin-Woong),김정환(Kim, Jung-Hwan),홍성남(Hong, Sung-Nam),김태완(Kim, Tae-Wan),박선규(Park, Sun-Kyu) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
The object of this study is to verify the formula that was proposed through direct shear experiments before. To verify the formula, proposed formula was compared to other formula that was proposed by Oguejiofor was Hosain in 1997 and then, steel-concrete composite deck experiments were fabricated. First experiment was used Perfobond Rib shear connector and Head Stud shear connector and other was used Perfobond Rib shear connector only. And static flexural tests where carried out on steel-concrete composite decks in order to analyze flexural shear stress. The result of experiments, by comparing direct shear stress and flexural shear stress which is calculated by EN 1994-1-1