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저온 박막 공정으로 제작된 Au 적층형 다층 투명전극의 결정성장 거동과 광-전기적 특성
지영석(Young-Seok Ji),최용(Yong Choi),이상헌(Sang-Heon Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
Transparent conducting oxide films like ITO/Au/ITO and AZO/Au/AZO were fabricated with a sputter at a low-temperature of less then 70℃ and their crystallization and opto-electrical properties were studied. X-ray diffractiometry showed that single-ITO layer was amorphous, whereas, ITO of ITO/Au/ITO multi-layer was crystal. The ITO crystallization and its orientation depended on Au crystallization. Surface roughness of the ITO-multi-layers were in the range of 29-88% of that of ITO-single layer. ITO on amorphous gold layer had more rough surface than ITO on crystal gold. The gold layer between ITO improved electrical conductivity. Carrier density, mobility, resistivity and sheet resistance of ITO-single layer were 2.3×10¹?/㎤, 85×㎠/Vs, 31×10?⁴Ω㎝, and 310×Ω/㎠, respectively. Those of ITO/Au/ITO-multi-layers depended on Au-interlayer-thickness, which were in the range of 3.6×10<SUP>19~</SUP>4.2×10₂₁/㎤, 43~85㎠/Vs, 0.17×10?⁴~25×10?⁴Ω㎝, and 1.7~20×Ω/㎠, respectively. The sheet resistances of the single-layer ITO and the multi-layer ITO were 310 and 2.7~21Ω/㎠, respectively. That of AZO/Au/AZO was 8.6Ω/㎠, which was better than the single-layer ITO.
척추 수술에서 C자형 이동형 투시장비의 조사야 조절기능을 이용한 선량감소효과 : 인체모형팬텀 연구
김현영(Hyeon-Young Kim),정용환(Yong-Hwan Jeong),조성봉(Seong-Bong Jo),권순안(Sun-Ahn Kwon),대창민(Chang-Min Dae),지영석(Young-Seok Ji) 대한영상의학기술학회 2021 대한영상의학기술학회 논문지 Vol.2021 No.-
C자형 이동형 투시 장비 (C-arm; C-arm Fluoroscopy equipment)는 일반적 수술 (General Surgery)에서 필수적으로 사용되며, 기술 발전에 따른 수술 사례와 수술 복잡성의 증가로 총 방사선 조사 시간이 증가하여 의료진 피폭선량의 위험성은 지속적으로 제기 되어왔다. 조사야 조절이 방사선량 감소에 큰 이점이 있다는 것은 이미 많은 선행 연구들을 통해 널리 알려져 있으므로, 본 연구에서는 조사야를 10%부터 40%까지 축소 조절하면서 환자에게 노출되는 방사선량과 의료진에게 노출되는 방사선량의 감소효과를 평가하고, 최적의 조사야 크기를 제시하고자 한다. 임상 사례와 가장 유사한 환경을 조성하고자 인체모형팬텀 (Whole-body phantom PBU60; Kyoto Kagaku Co., Ltd, Kyoto, Japan)을 사용하였으며, 전신 피폭을 가정하기 위하여 갑상선과 생식선 위치에서의 방사선량을 전자 피폭선량계 (Personal Electronic Dosimeters-Intrinsically Safe [PED-IS]; Tracerco Ltd., Billingham, UK)로 측정하였다. 완전히 개방된 조사야 대비 20% 축소 조절된 조사야의 선량감소율은 영상증배관 방식과 평판형 검출기 방식에서 각각 평균 41.18%, 27.97%였으며, 40% 축소 조절 된 조사야의 선량감소율은 각각 75.61%, 47.64%였다. 결과적으로 척추의 해부학적 위치와 수술부위 확인을 위한 수술 초기의 최소한의 조사야 조절은 20%이며, 조사야의 중심과 수술부위가 정확하게 일치했을 때 40%의 최적의 조사야로 조절하여 검사하는 것을 권장한다. C-arm is essential in general surgery, and the risk of radiation dose to the medical staff has been consistently considered significant due to increased surgical cases and increased complexity of surgery. It has already been widely recognized through many prior studies that reducing collimation size has significant benefits in reducing radiation dose. In this study, we would like to evaluate the effectiveness of reducing exposure dose for patients and medical staff while reducing the collimation of c-arm by 10%, 20%, 30%, and 40%, and propose an optimal collimation size. To create the most similar environment to the clinical case, the dummy phantom (Whole-body Phantom PBU60; Kyoto Kagaku Co., Ltd, Kyoto, Japan) was used. To assume exposure dose to the whole body, radiation doses at the thyroid and genital locations were measured using the Personal Electronic Dosimeters-Intrinsically Safe [PED-IS]; Tracerco Ltd., Billingham, UK. The average dose reduction rate for collimation, which is 20% reduced compared to non-collimation, was 41.18% in the Image intensifier type and 27.97% in the Flat panel detector type. The average dose reduction rate for the 40% reduced irradiation field was 75.61% for the Image intensifier type and 47.64% for the flat panel detector type. As a result, the minimal initial collimation to determine the anatomical location of the spine and the location of the surgical site is 20% reduced compared to non-collimation, It is recommended to examine with 40% reduced collimation compared to non-collimation, which is the optimal collimation, when the center of the field and the surgical site match exactly.
천식 환자에서 집먼지진드기 감작 유무에 따른 임상적 차이: 순천향 코호트 분석
김정현 ( Jung Hyun Kim ),장안수 ( An Soo Jang ),정신옥 ( Shin Ok Jeong ),지영석 ( Young Seok Ji ),서현정 ( Hyun Jung Seo ),남재형 ( Jae Hyung Nam ),문종주 ( Jong Joo Moon ),백애린 ( Ae Rin Baek ),박종숙 ( Jong Sook Park ),이준혁 ( 대한소아알레르기호흡기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.1
Purpose: The majority of patients with allergic disease are highly sensitized to house dust mites (HDM). There is few data to observe sensitization rate to HDM in asthmatics in Korea. The aim of this study was to observe the differences of clinical profiles by HDM sensitization in patients with asthmatics in Soonchunhyang University Hospital (SCH) cohort. Methods: We recruited 2,345 asthmatic patients in SCH cohort. Lung function, body mass index and sputum and blood eosinophils, and PC20, and clinical profiles were compared by HDM sensitization. Results: Dermatophagoides farinae (Derf) and/or Dermatophagoides pteronyssinus (Derp) (+) sensitization rate was higher prevalence in male than in female. Compared with nonatopy asthmatics, Derf and/or Derp (+) asthmatics had early onset of age [Derf and/or Derp (+) vs. Derf and Derp (-) vs. atopy (-); 32.5±0.51 vs. 36.1±0.88 vs. 43.1±0.54, P<0.05]. Derf and/or Derp (+) asthmatics had shorter duration of asthma symptom than that of nonatopy asthmatics. Derf and/or Derp (+) asthmatics had lower forced expiratory volume in one second and forced vital capacity than those of Derf and Derp (-) asthmatics. PC20 in Derf and/or Derp (+) asthmatics had lower than those of Derf and Derp (-) and nonatopy asthmatics [Derf and/or Derp (+) vs. Derf and Derp (-) vs. atopy (-); 5.4±0.24 mg/ mL vs. 6.59±0.52 mg/mL vs. 7.19±0.33 mg/mL, P<0.05]. Blood eosinophils number in Derf and/or Derp (+) asthmatics had higher than that of nonatopy asthmatics (414.7±131.1 vs. 350.6±14.0, P<0.05). Total immunoglobulin E (IgE) in Derf and/or Derp positive asthmatics had higher than that of Derf and Derp negative and nonatopy asthmatics. There was no difference of body mass index among three groups. Conclusions: Our data indicate that atopy asthmatics sensitized to Derf and/or Derp had early onset of age, high total IgE and airway responsiveness, and eosinophilic inflammation. (Allergy Asthma Respir Dis 1(1):50-54, 2013)