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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.
YTG VCO를 이용한 밀리미터파 대역 수신기의 PLL 시스템 연구
이창훈,정문희,김광동,김효령,Lee Changhoon,Chung M. H.,Kim K. D.,Kim H. R. 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.11
In this paper, we propose the PLL system of the local oscillator system for the millimeter wave band's radio astronomy receiving system. The development of the proposed local oscillator system based on the YIG oscillator VCO with $26.5\~40GHz$ specification. This system consists of the oscillator part including the YIG VCO, the harmonic mixer, and the isolator, the RF processing part including the triplexer, limiter, and RF discrimination processor, and the PLL system including YIG modulator and controller. Based on this configuration, we verify the frequency and power stability of the developed local oscillator system according to some temperature variation. From this test results we confirm the stable output frequency and power characteristic peformance of the developed LO system at constant temperature. 본 논문에서는 밀리미터파 대역의 전파천문 관측용 수신시스템의 안정된 동작을 확보하기 위한 국부발진시스템을 제안하였다. 제안된 국부발진시스템은 $26.5\~40GHz$를 발진하는 YIG 발진기를 VCO로 하여 개발하였다. 이러한 국부발진 시스템은 YIG VCO, 고조파 믹서, 및 아이솔레이터 등을 포함한 발진부, triplexer, limiter, 및 RF 판별 기능 등을 포함하는 RF 프로세싱 부분과 YIG PLL을 위한 모듈과 제어기를 포함한 PLL 시스템으로 구성하여 설계, 개발하였다. 본 연구에서는 개발된 국부 발진시스템의 안정성을 확인하기위해서 온도변화에 따른 출력 주파수와 전력 안정도를 측정하였다. 이러한 실험결과로부터 개발된 국부발진시스템은 일정한 온도에서는 매우 안정된 출력 주파수와 전력특성이 확보됨을 확인하였다.
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,이명종,Lee, Chang-Hun,Lee, Myeong-Jong 척추신경추나의학회 2006 척추신경추나의학회지 Vol.1 No.1
Objective : The Fibromyaigia Syndrome(FMS) is frequently used to call at clinic. There are not case reports on the treatment of FMS by oriental medicine. We got a effect on three patient with FMS by oriental medicine and this case is observed the clinical symptoms and scaled by VAS with chuna and acupuncture. Methods : We used to take chuna and acupunture, though classifcated by pathologic symptom and classification criteria of American College of Rheumatology. Result : Usually, most patients with FMS on the chronic stage have chronic prognosis. But symptoms of the patient on this report were improved after above treatments. Conclusion : This case showed oriental medicine enough could be applied on diseases like this syndrome as one of conservative therapies. Of course, more accurate diagnosis and research would be needed afterwards.
이창훈,조정훈,장준복,이경섭,위효선,Lee, Chang-Hoon,Cho, Jung-Hoon,Jang, Jun-Bock,Lee, Kyung-Sub,Wee, Hyo-Sun 대한한방체열의학회 2005 대한한방체열의학회지 Vol.4 No.1
Purpose : To examine the relation between male infertility and cold hypersensitivity on lower abdomen. Methods : From 2004, 4 to 2005, 10, a total 60(infertile male 30, normal male on semen analysis 30) patients who visited the Oriental gynecological department of Conmaul Oriental Medicine hospital was selected, and their medical records were reviewed retrospectively. We compared the temperature of 3 points(CV17, CV12, CV4) of both group by DITI(Dorex, DITI-16UTI and DITI-Spectrum 9000 MB). Results and Conclusion : The general characteristics such as age, weight, height, BMI, amount and frequency of drinking and smoking of both group were not different statistically. The mean ${\Delta}T1$ between upper and lower abdomen in infertile group was higer than in normal group but they were not different statistically. The mean ${\Delta}T2$ between chest and lower abdomen was $0.46{\pm}0.41$ in infertile group, and $0.18{\pm}0.56$ in normal group, and it shows significant difference statistically. There was no significant relationship between sperm motility and ${\Delta}T1$, ${\Delta}T2$ in infertile group. In this study, we suggest that an inclination of cold hypersensitivity of lower abdomen of infertile male, but it is expressed when it is contrasted to chest of the body rather than upper abdomen.
LED 및 반도체 소자 리드프레임 패키징용 Cu/STS/Cu 클래드메탈의 기계적/열전도/전기적 특성연구
이창훈,김기출,김용성,Lee, Chang-Hun,Kim, Ki-Chul,Kim, Young-Sung 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.3
Lead frame which has a high thermal conductivity and high mechanical strength is one of core technology for ultra-thin electronics such as LED lead frames, memory devices of semiconductors, smart phone, PDA, tablet PC, notebook PC etc. In this paper, we fabricated a Cu/STS/Cu 3-layered clad metal for lead frame packaging materials and characterized the mechanical properties and thermal conductive properties of the clad metal lead frame material. The clad metal lead frame material has a comparable thermal conductivity to typical copper alloy lead frame materials and has a reinforced mechanical tensile strength by 1.6 times to typical pure copper lead frame materials. The thermal conductivity and mechanical tensile strength of the Cu/STS/Cu clad metal are 284.35 W/m K and $52.78kg/mm^2$, respectively.