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이동환,Lee, Dong-Hwan 한국건강관리협회 1988 건강소식 Vol.12 No.12
환경공해, 약물 남용 등으로 인해 선천적으로 신체적 이상을 갖고 태어나는 어린이들이 늘고 있어, 어린이 건강, 더 나아가 국민 건강 향상에 악영향을 미치고 있다. 그러나 이 선천성 기형도 조기에 발견만하면 충분히 치료가 가능하다고 이동환 순천향의대 소아과교수는 지난 11월 11일 건강관리협회에서 있었던 건강관리 Work-shop을 통해 발표했다. 본문은 그의 발표문을 게재한 것이다.
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임의의 영상 임피던스와 결합기를 갖는 hairpin형태의 대역통과 여파기 설계
이동환,이용우,김철수,김근영,박준석,안달,Lee, Dong-Hwan,Lee, Yong-Woo,Kim, Chul-Soo,Kim, Geun-Young,Park, Jun-Seok,Ahn, Dal 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.12
기존에 제시되었던 hairpin 형태의 대역통과 여파기 설계방법은 공진기 및 인버터를 구성하는 전송선로의 특성 임피던스와 결합길이가 제한되어 있으며, 설계 파라미터의 추출 방법이 난해하다는 단점을 갖고 있다. 따라서 본 논문에서는 각 전송선로가 서로 다른 특성 임피던스와 결합길이로 구성된 병렬 결합선로 형태의 대역통과 여파기 설계식을 유도하고, 이를 이용하여 hairpin 형태의 대역통과 여파기를 제작하기 위한 새로운 설계방법을 제시하였다. 또한 논문에서 제안한 설계 방법을 이용하여 IMT-2000 시스템용 RX 대역 및 TX 대역 대역통과 여파기의 듀플렉서를 제작하고 특성을 측정하였다. Several kinds of design method for the hairpin type band-pass filter have been reported. The conventional design methods have some restrictions in characteristic impedance of coupled line section, which provide complexities to designer. In this paper, the novel design formulas for the hairpin type band pass filter have been derived and proposed to resolve the problems of the reported design methods. By employing the equivalent circuit of the coupled line section and band pass filter design theory, the design procedures and formulas are derived. The hairpin type RX/TX band pass filters for the IMT-2000 service have been designed, fabricated with duplexer configuration, and then measured to show the validity of the proposed design method.
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Primary Burkitt’s Lymphoma in the Nasal Cavity and Paranasal Sinuses
이동환,유명상,이봉재 대한이비인후과학회 2013 Clinical and Experimental Otorhinolaryngology Vol.6 No.3
Burkitt’s lymphoma is a highly aggressive small B-cell lymphoma. The treatment of choice is complex chemotherapy. As a rare tumor in the head and neck area, Burkitt’s lymphoma usually involves cervical lymph nodes, and only fewer than 25%of cases involves extranodal regions. Involvement of the paranasal sinuses has been reported in only 14 cases in the past century. We describe here two patients with rare, sporadic, American type Burkitt’s lymphoma involving the nasal cavity and paranasal sinuses manifesting nasal obstruction. We also review clinical and histological features of Burkitt’s lymphoma.
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1.2GPa급 초고강도강판의 단면 형태에 따른 스프링백에 관한 해석적 평가 및 연구
이동환,한성렬,이춘규 한국금형공학회 2019 한국금형공학회지 Vol.13 No.4
Currently, studies on weight reduction and fuel efficiency increase are the most important topics in the automotive industry and many studies are under way. Among them, weight reduction is the best way to raise fuel efficiency and solve environmental pollution and resource depletion. Materials such as aluminum, magnesium and carbon curing materials can be found in lightweight materials. Among these, research on improvement of bonding technology and manufacturing method of materials and improvement of material properties through study of ultrahigh strength steel sheet is expected to be the biggest part of material weight reduction. As the strength of the ultra hight strength steel sheet increases during forming, it is difficult to obtain the dimensional accuracy as the elastic restoring force increases compared to the hardness or high strength steel sheet. It is known that the spring back phenomenon is affected by various factors depending on the raw material and processing process. We have conducted analytical evaluations and studies to analyze the springback that occurs according to the cross-sectional shape of the ultra high tensile steel sheet.
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음이온교환수지의 관능기 구조에 따른 제거 이온의 선택성 변화
이동환,김광락,이민규,전진희,김승일 한국공업화학회 1999 응용화학 Vol.3 No.1
A series of anion exchange resines which have various tertiary amino as functional group has been synthesized by the reaction of chloromethylated polystyrene-divinylbenzene copolymer and the corresoonding tertiary amines [NMe₃, NEt₃, N(EtOH)₃, NMe₂Ph, NPh₃, N^Pr₃)] in solvent. The fundamental properties such as bulk density, water content appearance index, exchange capacity, effective size, and uniformity coefficient of synthesized anion exchange resines have been measured. Properties of the ion exchange resin upon substitutents have been discussed, in which more steric bulky amines than NMe₃ have exhibited a better selectity for nitrate than for sulfate.
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