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Lost wax technique과 CAD를 이용한 pattern의 프린팅 방식으로 제작된 가철성 국소의치 금속구조물의 적합도 비교
최원준,우이형,김형섭,백장현,Choi, Wonjun,Woo, Yi-Hyung,Kim, Hyeong-Seob,Paek, Janghyun 대한치과보철학회 2018 대한치과보철학회지 Vol.56 No.1
가철성 국소의치의 금속구조물을 제작하는 방법은 왁스 패턴을 제작하여 주조하는 lost wax technique이 주로 사용되어 왔으나, 디지털 기술의 발달로 서베잉과 금속구조물을 CAD (Computer aided design)로 디자인하여 제작할 수 있게 되었다. 여러 증례에서 CAD를 이용한 pattern의 프린팅 방식으로 얻은 레진 패턴이 구강 내에 정확하게 적합 되었고 최종 금속구조물 또한 좋은 적합도를 보였다고 보고되었다. 본 원저는 치조골 소실이 심한 상, 하악부분 무치악 환자에서 가철성 국소의치의 금속구조물을 두 가지 방식으로 각각 제작하였다. 첫 번째는 일반적인 lost wax technique과 두 번째는 CAD를 통해 pattern을 프린팅하여 금속구조물을 주조하는 방식으로 제작하여, CAD data와 fit checker를 이용해 금속구조물과 서베이드 크라운과의 유격을 측정함으로써 금속구조물의 적합도를 비교하였다. 두 가지 방식 모두 임상적으로 사용 가능한 금속구조물의 적합도를 얻었기에 이를 보고하고자 한다. Lost wax technique of casting wax patterns has been used principally to make metal frameworks of removable partial dentures. Since the development of digital technology and CAD, metal frameworks can be built through digital surveying and framework designing. Many cases proved that resin patterns made by CAD printing method were well adapted to internal oral structure and final metal frameworks also showed good internal adaptation as well. The metal frameworks of a removable partial denture were made by both lost wax technique and CAD technique and were applied to a patient with severe alveolar bone loss. Using CAD data and fit checker, internal adaptation of both metal frameworks were evaluated by comparing the gap between surveyed crown and its structure. This study is to prove that metal frameworks by both techniques showed adaptation that can be applied in clinical field.
제주 남서부지역 스코리아의 철 화합물에 대한 미시적 연구
최원준,고정대,Choi, Won-Jun,Ko, Jeong-Dae 한국재료학회 2008 한국재료학회지 Vol.18 No.3
Fe compounds in scoria as distributed in the south-western area of Jeju Island were investigated using X-ray fluorescence spectroscopy, X-ray diffractometry, and $^{57}Fe$ $M{\ddot{o}}ssbauer$ spectroscopy. The samples were prepared from four parasite volcanoes. It was found that these samples are typical basalt comprised of $SiO_2$, $Al_2O_3$, Fe, and silicate minerals. The $M{\ddot{o}}ssbauer$ spectra showed doublets for olivine, pyroxene, and ilmenite as well as sextets for hematite and magnetite. The valence state of Fe is chiefly a 3+ charge state with a slight 2+ charge state. It is expected that these results will add to the body of information related to the formation mechanisms of Jeju Island.
An optimal design of 4${\times}$4 optical matrix switch
최원준,홍성철,이석,김회종,이정일,강광남,조규만,Choi, Won-Jun,Hong, Song-Cheol,Lee, Seok,Kim, Hwe-Jong,Lee, Jung-Il,Kang, Kwang-Nham,Cho, Kyu-Man The Institute of Electronics and Information Engin 1995 전자공학회논문지-A Vol.32 No.8
The design procedure of a GaAs/AlGaAs semiconductor matrix optical switch is presented for a simplified tree architecture in the viewpoint of optical loss. A low loss, 0.537 dB/cm, pin type substrate is designed by considering the loss due to imputity doping at 1.3 $\mu$m wavelength. The operating voltage and the device length of a reversed ${\Delta}{\beta}$ electro-optic directional coupler(EODC) swith which is a cross-point device of the 4${\times}$4 matrix optical switch and the bending loss of rib waveguide are caculated as functions of waveguide parameters and bending parameters. There is an optimum bending radius for some waveguide parameters. It is recommened that higher optical confinement conditions such as wide waveguide width and higher rib-height should be chosen for structural parameters of a low loss and a process insensitive 4${\times}$4 matris optical switch. A 4${\times}$4 optical matrix switch which has a 3 dB loss and a 12 volt operating voltage is designed.
최원준,박혜규,신현오,Choi, Won-Joon,Park, Hye-Kyou,Shin, Hyun-Oh 대한산업공학회 1996 산업공학 Vol.9 No.2
자동차 조립공장의 생산은 혼류생산 (Mixed-Model Production)의 대표적인 형태로서 동일한 조립라인에서 다양한 사양의 차량들을 Batch생산이 아니라 각 사양의 생산량이 평준화되도록 생산을 하는 것이 특징이다. 그런데 도장라인에서 생산완료 된 순서는 혼류조립라에서의 평준화 생산에 적합하지 않은 상태이므로 조립라인에의 투입순서를 재작성하여 제어하여야 한다. 본 논문에서는 조립라인의 실시간 투입순서 작성 및 운영시스템을 자동화하여 성공적으로 운영한 사례를 소개하고자 한다.
최원준,박천웅,박정효,김영도,변종민,Choi, Won June,Park, Chun Woong,Park, Jung Hyo,Kim, Young Do,Byun, Jong Min 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.2
Over the last decade, the next generation's ultra-high-temperature materials as an alternative to Nickel-based superalloys have been highlighted. Ultra-high-temperature materials based on refractory metals are one of several potential candidates. In particular, molybdenum alloys with small amounts of silicon and boron (Mo-Si-B alloys) have superior properties at high temperature. However, research related to Mo-Si-B alloys were mainly conducted by several developed countries but garnered little interest in Korea. Therefore, in this review paper, we introduce the development history of Mo-Si-B alloys briefly and discuss the properties, particularly the mechanical and oxidation properties of Mo-Si-B alloys. We also introduce the latest research trends of Mo-Si-B alloys based on the research paper. Finally, for domestic research related to this field, we explain why Mo-Si-B alloys should be developed and suggest the potential directions for Mo-Si-B alloys research.
Spectral Response Change in a Quantum Well Infrared Photodetector by Using Quantum Well Intermixing
최원준,김은규,H. J. Kim,한일기,J. C. Shin,J. I. Lee,J. W. Choi,Y. J. Park 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We have studied the change of spectral response in a Quantum Well Infrared Photodetector (QWIP) by using the Impurity Free Vacancy Disordering (IFVD) technique to change the bandgap of GaAs/AlGaAs Multi Quantum-Well (MQW) absorption layer. The fabricated QWIP whose MQW absorption region was intermixed by an IFVD technique showed the maximum change in spectral response peak from 8 to 10mm at 10K when compared to a QWIP without intermixing.
최원준,Choi, Won-Joon 대한산업공학회 1996 산업공학 Vol.9 No.2
자동차 조립공장의 주요 공정은 차체라인, 도장라인, 조립라인의 순으로 구성되어 있다. 작업의 효율성을 높이기 위하여 차체라인과 조립라인은 주요 부품소모의 평준화를, 도장라인은 동일 색상차체의 연속 생산을 선호하므로, 생산순서의 결정시 상호 상층되는 점이 많다. 본 연구에서는 조립공장전체의 생산성을 극대화하기 위하여 차체라인, 도장라인, 조립라인의 특성을 고려한 일일생산순서결정 방법을 제시한다.
포토폴리머 위상 격자를 이용한 파장 역다중화 구조 및 특성 분석
최원준,안준원,김남,이권연,Choi, Won-Jun,An, Jun-Won,Kim, Nam,Lee, Kwon-Yeon 한국광학회 2002 한국광학회지 Vol.13 No.1
포토폴리머에 형성된 홀로그래픽 부피 위상 격자를 이용한 새로운 구조의 파장 역다중화기를 제안하고, 입증하였다. WDM 용 역다중화 소자로의 적용을 위해 격자의 파장선택성, 공간적 채널 거리, 채널 대역폭에 대한 이론적, 실험적 분석을 통해응용 가능성을 증명하였다. 실험결과 각 채널의 대역폭은 0.21 m이고, 채널간격이 0.8 nm일때 채널누화특성은 26 dB였다. A new wavelength demultiplexing scheme using holographic volume phase grating formed in photopolymer is proposed and demonstrated. Through the analysis and experiments of the design parameters such as wavelength selectivity, operating spectral range, spatial channel distance and spatial intensity distribution of each channel, we proved that the proposed demultiplexing scheme is promising for wavelength division multiplexing (WDM). From the experimental results, the 3 dB bandwidth of 0.21nm and the crosstalk level of 26 dB for a 0.8 nm channel spacing are observed.
A Turbine-Blade-Balancing Problem with Some Locking Blades
최원준,Choi, Won-Joon 대한산업공학회 2001 산업공학 Vol.14 No.2
In the turbine-blade manufacturing industry, turbine-blades are machined and then are assembled to form a circular roll of blades. The roll of blades should be balanced as much as possible, since otherwise the efficiency of the turbine generator might be damaged. A locking blade is a blade whose location is fixed and a non-locking blade is a blade whose location can be freely changed. In this paper, we study methods for balancing the weights of the rotating blades for a turbine where some blades are locking blades. The turbine-blade balancing problem is formulated into a mixed-integer programming problem, which turns out to be NP-hard. A heuristic method based on the number partitioning algorithm is developed and the computational experiments show very promising results.
탄화 규소가 균일 분산된 규화 몰리브데넘계 복합재의 제조
최원준,박천웅,김영도,변종민,Choi, Won June,Park, Chun Woong,Kim, Young Do,Byun, Jong Min 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.5
Molybdenum silicide has gained interest for high temperature structural applications. However, poor fracture toughness at room temperatures and low creep resistance at elevated temperatures have hindered its practical applications. This study uses a novel powder metallurgical approach applied to uniformly mixed molybdenum silicide-based composites with silicon carbide. The degree of powder mixing with different ball milling time is also demonstrated by Voronoi diagrams. Core-shell composite powder with Mo nanoparticles as the shell and ${\beta}-SiC$ as the core is prepared via chemical vapor transport. Using this prepared core-shell composite powder, the molybdenum silicide-based composites with uniformly dispersed ${\beta}-SiC$ are fabricated using pressureless sintering. The relative density of the specimens sintered at $1500^{\circ}C$ for 10 h is 97.1%, which is similar to pressure sintering owing to improved sinterability using Mo nanoparticles.