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류마티스 관절염 환자에서 발생한 연합건의 석회성 건염 - 증례보고 -
이창훈,김성재,이승훈,구민회,이봉근,Lee, Chang-Hun,Kim, Sung-Jae,Lee, Seung-Hun,Koo, Min-Hoi,Lee, Bong-Gun 대한정형외과초음파학회 2012 대한정형외과 초음파학회지 Vol.5 No.1
석회성 건염은 건의 부착부 주변에 발생하는 병변으로 견관절에서는 주로 극상근의 대결절 부착 부위의 근위부에 발생하는 경우가 대부분이다. 저자들은 류마티스 관절염을 가진 환자에서 발생한 상완 이두근 단두건과 오구상완근의 연합건의 석회성 건염을 초음파 검사를 통해 진단한 증례를 경험하여 보고하는 바이다. Calcific tendinitis usually occurs within the area where tendon inserts to bone. In the shoulder joints, most cases occur within the supraspinatus tendon just proximal to the greater tuberosity. We report a rare case of calcific tendinitis occurred within the conjoined tendon of coracobrachialis and short head of biceps brachii in a patient with rheumatoid arthritis, diagnosed by means of ultrasonographic evaluation.
이창훈,이만섭,권영혁,박준봉,허익,Lee, Chang-Hoon,Lee, Man-Sup,Kwon, Young-Hyuk,Park, Joon-Bong,Herr, Yeek 대한치주과학회 2003 Journal of Periodontal & Implant Science Vol.33 No.2
The purpose of this study is to evaluate the phenomenon of attachment and spreading of the cultured rat calvarial cell inoculated on their surface of different kinds of biodegradable membrane which had been used on tissue regeneration on periodontal defects by using scanning electron microscope. In this experiment 30 Sprague-Dawley male rats (mean BW 150gm) were used to harvest abundant number of cell in the short period. The rats were sacrificed by decapitatioan to obtain the calvaria for bone cell culture. Calvarial cells were cultured with Dulbecco's Modified Essential Medium contained with 10% Fetal Bovine Serum under the conventional conditions. Biodegradable barrier membrane were collected with collagen type, and were divided into 3 different kind of surface such as scattered, polarized and fine-net type as their surface texture. Microcover plate which usually used for cell culture was used as control for smooth surface. All the membrane were seeded with cultured calvarial cell on their surface. The number of cell inoculated on the membrane were $1{\times}10^6$ Cells/ml. After the culture as designed time, all the membrane were washed with 0.1 M Phosphate Buffered saline and fuxed with 2.5% Glutaraldehyde. And all specimen were treated with $OsO_4$, and Tannic acid before drying the cell for coating the cell with gold. Scanning Electron Microscope was used to observation. The following results were obtained. I. During the whole period of experiment, the phenomenon of cell attachment and spreading were revealed similar pattern to compare with smooth surface culture plate and ordinary culture dish. 2. The shape of cell attachment and spreading on the surface of barrier membrane were observed no remarked difference pattern between smooth surface culture plate and ordinary culture dish. 3. The cytoplasmic process of cultured calvaria cell extent to the deep portion of barrier membrane like as their own proper shape. 4. There were no remarkable relationships between the degree of cultured cell spreading and surface structure of barrier membrane. 5. Slight starified layer of cultured calvaria cell were observed on the scattered type of resorbable membrane, Conclusively, this study thus suggest that cultured bone cell inoculated onto the biodegradable barrier membrane may have an important role of carrier for many cell which could be used as new tissue regeneration, and those tissue engeering technique may become an new method in the approach to the repair of bone defects.
Effect of Nickel Content on the Neutron Irradiation Embrittlement of Ni-Mo-Cr Steels
이창훈,R. Kasada,A. KIMURA,Bong-Sang Lee,서동우,Hu-Chul Lee 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
The influence of nickel on the neutron irradiation embrittlement of Ni-Mo-Cr reactor pressure vessel (RPV) steels was investigated using alloys containing nickel in the range of 0.9-3.5 wt%. In all investigated alloys, the neutron irradiation with two dose conditions of 4.5 × 10 19 neutron/cm 2 at 290 °C and 9.0 × 10 19 neutron/cm 2 at 290 °C, respectively, increased the hardness and ductile-to-brittle transition temperature (DBTT). However, the increases of the hardness and DBTT resulting from the neutron irradiation were primarily affected by the irradiation dose that is closely related to the generation of irradiation defects, but not by the nickel content. In addition, a linear relationship between the changes in the hardness and DBTT subjected to the irradiation was confirmed. These results demonstrate that increasing the nickel content up to 3.5 wt% does not have a harmful effect on the irradiation embrittlement of Ni-Mo-Cr reactor pressure vessel (RPV) steels.
사진측량법을 이용한 대덕전파천문대 13.7미터 안테나의 경면 조정
이창훈,정재훈,강현우,김현구,이영웅,정진오,손영득,배민수,Lee, Changhoon,Jung, J.H.,Kang, H.W.,Kim, H.G.,Lee, Youngung,Jung, J.O.,Sohn, Y.D.,Bae, M.S. 한국천문학회 2014 天文學論叢 Vol.29 No.3
We improved the antenna efficiency of the Taeduk Radio Astronomy Observatory (TRAO) 13.7-m radio telescope by adjusting the antenna panels based on digital photogrammetric measurements. First of all, we measured the surface accuracy of the main reflector of this antenna at three elevation angles of $35^{\circ}$, $45^{\circ}$, and $60^{\circ}$. We performed a total of four sets of the photogrammetric measurements and panel adjustments. When adjusting the panels, we positioned the antenna to the zenith and applied the measured data sets at the elevation of $45^{\circ}$. We found that the antenna surface accuracy has been improved by a factor of ~ 3 times after the final adjustment in comparison with the value before the adjustments. And we also found that the antenna surface accuracy tended to be slightly better at the elevation angles of $35^{\circ}$ and $60^{\circ}$ than that at the elevation angle of $45^{\circ}$. After the final panel adjustment, the aperture and beam efficiencies of the telescope have has been improved from 35% to 44%, and from 41% to 51%, respectively.
이창훈,Lee, Changhoon 대한심미치과학회 2018 Journal of the Korean Academy of Esthetic Dentistr Vol.27 No.2
2급와동의 복합레진수복은 강한 컨택과 적절한 외형 형성이 쉽지 않은 치료술식이다. 이를 극복하기 위해 고안된 매트릭스 시스템들이 있으나, 이에 대해 익숙하지 않은 술자들은 여전히 어려움을 겪곤한다. 이에 쉽고 효율적으로 성공적인 결과를 얻을 수 있는 테크닉을 필요하다. 본 케이스 리포트에서는 2급 와동의 복합레진수복술식을 과정별로 설명하고, 쉽고 간단히 만족할 만한 결과를 얻을 수 있는 원칙들과 임상팁들을 설명하였다. Composite resin restoration on class II cavities is a challenging procedure since it is tough to replicate proper contact, the natural shape of the tooth, etc. Moreover, it is not familiar with the procedure and tools for this specific situation, neither. Nowadays the patients, however, request more and more composite restorations which are relatively quick and more esthetic. In this case report, the class II composite resin restoration procedure is illustrated step by step. Every step must be considered its final consequence thoroughly. In this approach, we can minimize the finishing procedure and save our effort and time.
이창훈,Lee, Chang-Hoon 배재대학교 공학연구소 2006 공학논문집 Vol.8 No.1
본 논문에서는 마이크로폰 어레이 시스템을 이용하여 여러 화자의 음성 정보로부터 각 화자가 위치한 방향을 추정하는 기술 개발 내용을 다룬다. 성능 향상을 위한 전처리 과정으로 비선형 증폭기를 사용하여 거리에 따른 영향을 최소화하는 과정과 잡음에 대한 강인성을 얻기 위해 음성활성 영역을 검출하는 과정을 포함한다. 등간격으로 배치된 마이크로폰 어레이 시스템의 기하학적 특성에 따른 음원의 위치와 신호의 지연시간차이와의 상관관계로부터 화자의 위치를 역으로 추정하는 알고리즘을 기본으로 하여 가능성 척도를 계산하고 이를 활용하여 가능성이 높은 것들을 클러스터링하여 가능성이 있는 후보를 선정하여 화자의 방향을 검지한다. 이 과정에서 오인식을 최소화하기 위하여 가능성이 희박한 영역에 대한 추정 억제 방법으로 부정식 추론법을 적용하였다. 2 화자의 음성 신호를 입력으로 한 실험을 통하여 제안한 방법에 의한 다화자 방향검지의 가능성을 알아보았다.