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고한웅,리준문,유재덕,김세연,안병철,박동희,Ko Han-Woong,Lee Junwen,Yu Jae-Deok,Kim Se-Yon,Ahn Bierng-Chearl,Park Dong-Hee 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.1
본 논문에서는 인공위성의 원격 측정, 명령 및 제어(TT&C)용에 적합한 원뿔 나선 안테나의 설계 및 제작에 관해 검토하였다. $2.0{\sim}2.3\;GHz$ 대역에서 동작하며 반구면상에서 양호한 이득 특성과 축비 특성을 가지도록 나선의 형상을 상용 전자장 소프트웨어를 이용하여 최적 설계하였다. 원뿐 나선의 급전을 위한 동축선 무한 벌룬은 실험적인 방법으로 구현하였다. 설계된 나선의 형상을 정밀하게 제작하는 방법을 제시하였다. 설계한 안테나를 제작하여 측정한 결과 $2.0{\sim}2.3\;GHz$ 대역에서 -18 dB 이하의 반사 계수, 4 dB 이상의 이득, 이득이 0 dB 이상인 각도가 안테나 축으로부터 ${\pm}75^{\circ}$, 축비가 5 dB 이하인 각도가 안테나 축으로부터 ${\pm}90^{\circ}$, 15 dB 이상의 전후 방비 등 양호한 특성을 얻었다. In this paper, we investigate the design and fabrication of a conical spiral antenna suitable for satellite TT&C applications. The shape of the spiral is optimized using a commercial electromagnetic software for good gain and axial ratio performances over $2.0{\sim}2.3\;GHz$ frequencies. A coaxial infinite balun feeding the spiral is designed using experimental methods. A method for precision fabrication of the spiral is presented. Measurements of the fabricated antenna show satisfactory performances over $2.0{\sim}2.3\;GHz$ such as a reflection coefficient less than -18 dB, a maximum gain greater than 4 dB, a gain greater than 0 dB over angles ${\pm}75^{\circ}$ from the antenna boresight, an axial ratio less than 5 dB over angles ${\pm}90^{\circ}$ from the antenna boresight, a front-back ratio greater than 15 dB.
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고한웅,계민석,동은상,윤을식,구상환,박승하 대한성형외과학회 2002 Archives of Plastic Surgery Vol.29 No.4
Paget-Schroetter syndrome is synonymous with spontaneous or effort-induced thrombosis of the axillosubclavian vein that is characterized by swelling and pain on upper extremity. Though axillosubclavian thrombosis represents only 1-2%, its frequency of diagnosis has increased over the past years due to improvement of ultrasonography. Although the cause of catheter and drug-related cases is clear, several studies have invested the etiology of Paget- Schroetter syndrome, a condition more commonly seen in the young and otherwise healthy individual. Factors often cited include compression of the vein by the anatomic structure, stress, or excessive effort to the extremity, and repetitive shoulder-arm motion. In the view of treatment, thrombolysis by direct infusion of urokinase has proven to be superior to surgical thrombectomy and is now treatment of choice.We successfully treated a 30-year-old man who suffered from swelling and pain on the right upper extremity by using direct urokinase infusion on thrombosis of subclavian vein.This is very rare disease in plastic and reconstructive surgery, thus diagnosis will seldom be made on clinical evaluation. It should be included in the differential diagnosis of upper extremity swelling compared with lymphedema.
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황순미,고한웅,박동희,윤소현,엄만석,안병철,Hwang Soon-Mi,Ko Han-Woong,Park Dong-Hee,Yun So-Hyeun,Uhm Man-Seok,Ahn Bierng-Chearl 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.2
본 논문에서는 두 개의 주파수 대역에서 동작하는 주름형 정사각형 도파관 편파기의 설계 방법을 제시하였다. 두 개의 주파수 대역에서 축비 대역폭이 최적이 되며 낮은 입력 반사계수를 가지도록 아이리스의 개수, 두께, 높이 등의 설계 변수 결정법을 제시하였다. 설계기법의 적용 예로서 21 GHz와 31 GHz 대역에서 동작하는 편파기를 설계, 제작, 측정하였다. 제작된 편파기는 $20.8\~21.2\;GHz$ 대역과 $30.6\~31.0\;GHz$ 대역에서 -35 dB 이하의 반사계수와 0.3 dB 이하의 축비를 가짐을 확인하였다. In this paper, we present methods for designing a square-waveguide iris polarizer operating at dual frequency bands. Methods are presented fur determining the number of ires, iris thickness, iris height and spacing between ires so that the input reflection is low and the axial-ratio bandwidth is optimized at two frequency bands. As an example of the application of the proposed method, a polarizer operating at 21 GHz and 31 GHz bands is designed, fabricated and tested. The fabricated polarizer shows a reflection coefficient less than -35 dB and an axial ratio less than 0.3 dB at $20.8\~21.2\;GHz$ and $30.6\~31.0\;GHz$.
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리준문,김진영,고한웅,박동희,안병철,Li Jun-Wen,Kim Jin-Young,Ko Han-Woong,Park Dong-Hee,Ahn Bierng-Chearl 한국전자파학회 2004 한국전자파학회논문지 Vol.15 No.12
본 논문에서는 12/14 GHz대역에서 동작하는 단순한 구조의 협대역 직교모드 변환기의 설계기법을 제시하였다. 본 논문에서 제안된 직교모드 변환기는 공용포트인 원형 도파관에 입사된 수평편파 신호는 직선포트 사각형 도파관으로 전달되게 하고 수직편파는 원형 도파관 벽상의 결합슬롯을 통하여 측면포트 사각형 도파관으로 전달되게 하는 구조를 가진다. 우선 도파관 이론과 임피던스 변환이론에 기초하여 직교모드 변환기 각 부분의 설계기법을 도출하였다 다음에 이를 토대로 상용 전자장 해석 소프트웨어를 이용하여 전체 직교모드 변환기 구조를 설계하였다. 설계된 직교모드 변환기를 제작 측정하여 설계기법의 타당성을 확인하였다. In this paper, a technique is presented f3r the design of a structurally simple narrow-band orthomode transducer (OMT) operating at 12/14 GHz frequency bands. The proposed OMT has such a structure that a horizontally polarized wave incident on the circular waveguide of the common port is directed to the rectangular waveguide of the straight port, while the vertically polarized wave is directed to the rectangular waveguide of the side port. Firstly methods are developed f3r designing individual parts of the OMT based on the waveguide theory and the theory of impedance matching. Secondly based on developed methods the whole OMT structure is designed using a commercial electromagnetic field analysis software. The validity of the proposed design technique is confirmed by fabricating and testing the designed OMT.
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여러 가지 폴리우레탄 거품 상처치료제가 흰쥐의 상피화에 미치는 영향에 대한 비교
유상철,한승규,신용원,고한웅,최윤지,정동석,이병일,김우경 대한성형외과학회 2003 Archives of Plastic Surgery Vol.30 No.2
Polyurethane foam dressings are becoming widely used in partial and full thickness skin wounds since they are safe and convenient for both patients and physicians. However, the influence of polyurethane foam dressings on epithelialization has not been fully determined yet. This study was designed to compare 2 internationally available polyurethane foams and 3 locally made polyurethane foams as to their effects on the epithelialization in vivo. Twenty white rats were used. A 5mm punch was employed to excise skin and subcutaneous tissue in a round fashion at six sites in the back area of 10 rats. After creating 6 open wounds, above mentioned 5 polyurethane foams and gauze dressings were applied. On the 5th day the lengths of the nonepithelialized area were measured under light microscope. In addition, partial thickness wounds were created using carbon dioxide laser at six sites on the back of the another 10 rats. Six dressings were applied on the wounds as same as above. On the 4th day the degree of the epithelialization was measured and compared. In full thickness wound study the best wound closing was also seen in chitin mixed Medifoam-N group. In partial thickness wound study the best epithelialization was seen in chitin mixed Medifoam-N and chitosan mixed Medifoam-N groups. These results demonstrated that polyurethane foam dressings influenced the epithelialization, and chitin mixed Medifoam-N showed the best result.
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