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CVD 반응기 내에서의 유동장에 대한 샤워헤드 지름의 영향에 대한 수치적 연구
김유재(You-Jae Kim),김윤제(Youn J. Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Plasma Enhanced Chemical Vapor Deposition (PECVD) process uses unique property of plasma to modify surfaces and to achieve the high deposition rates. In this study, a vertical thermal RF-PECVD (Radio Frequency-PECVD) reactor is modeled to investigate thermal flow and the deposition rates with various shapes of the showerhead. The showerhead in the CVD reactor has the shape of a ring and gases are injected in parallel with the susceptor, which is a rotating disk. In order to achieve the high deposition rates, we have simulated the thermal flow fields in the reactor with several showerhead models. Especially the effects of the number of injection holes and the rotating speed of the susceptor are studied. Using a commercial code, CFDACE, which uses FVM (Finite Volume Method) and SIMPLE algorithm, governing equations have been solved for the pressure, mass-flow rates and temperature distributions in the CVD reactor. With the help of the Nusselt number and Sherwood number, the heat and mass transfers on the susceptor are investigated. In order to characteristics of measure the flatness of the layer, furthermore, the relative growth rate (RGR) is considered.
크론병을 동반한 강직척추염에서 발생한 성인형 스틸병 1예
김유재 ( You Jae Kim ),박환성 ( Hwan Sung Park ),김수정 ( Su Jeong Kim ),김성수 ( Sung Soo Kim ),김용길 ( Yong Gil Kim ),이창근 ( Chang Keun Lee ),유빈 ( Bin Yoo ) 대한류마티스학회 2011 대한류마티스학회지 Vol.18 No.2
Adult-onset Still`s disease (AOSD) is an inflammatory disorder of unknown aetiology characterized by a variety of clinical symptoms. AOSD can precede or occur concomitantly with AS and only a few cases of AOSD with AS have been reported. A 21-year-old man presented with spiking fever, sore throat, arthralgia, maculopapular rash, lymphadenopathy, and chronic inflammatory back pain. His laboratory findings showed marked elevations of liver enzyme, C-reactive protein, erythrocyte sedimentatioin rate, ferritin, and sacroiliitis (grade 2), which were the main characteristics of AOSD and AS. Most symptoms except chronic low back pain were improved after treatment with corticosteroid and disease modifying anti-rheumatic drugs. He was then treated with anti- tumor necrosis factor-alpha (anti-TNF-α) agents to control the disease activity of AS and subsequently showed clinical and serological improvement. This is a first case report of AOSD combined with AS in Korea.
혈연간 동종 조혈모세포 이식 후 이식편대숙주질환과 함께 발생한 급성 호산구성 폐렴
박환성 ( Hwan Sung Park ),옥태진 ( Tae Jin Ok ),김유재 ( You Jae Kim ),김광운 ( Guang Un Kim ),박소은 ( So Eun Park ),안지현 ( Ji Hyun An ),김윤구 ( Yun Ku Kim ),정재호 ( Jae Ho Jeong ),김수정 ( Su Jeong Kim ),이유미 ( Yu Mi Lee ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.71 No.6
Pulmonary complications occur in 40~60% of patients who receive hematopoietic stem cell transplantation (HSCT) and are a source of substantial morbidity and mortality. Acute eosinophilic pneumonia (AEP) is an uncommon, non-infectious pulmonary complication occurring in HSCT recipients. We now report the case of a 52-year-old man with AEP who was treated with allogenic HSCT due to acute myeloid leukemia. He complained of fever, cough and dyspnea 390 days after allogenic HSCT. He also had skin and hepatic graft versus host disease (GVHD). Hypoxemia, diffuse pulmonary infiltrates on a chest x-ray and eosinophilia in bronchoalveolar lavage fluid were also noted in several tests. His symptoms, pulmonary infiltrates, hepatic dysfunction and skin lesions rapidly improved after treatment with corticosteroid therapy. Our case supports the idea that AEP is a late phase non-infectious pulmonary complication and one of the manifestations of chronic GVHD.
천장형 에어컨 토출각 변화가 실내 열쾌적성에 미치는 영향
이진형(Jin-Hyung Lee),김유재(You-Jae Kim),박성관(Sung-Kwan Park),이종철(Jong-Chul Lee),김윤제(Youn-Jea Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper considered the effect of discharge angles of 4-way cassette A/C on the indoor thermal comfort in high ceiling environment. The heat transfer from outdoor is considered through the window, the entrance door, ceiling, floor, and walls. The numerical study is performed with the height of the room in which is 3.6 m higher than the height of common building (2.7m). Using a commercial code, FLUENT, the numerical study is performed with incompressible, unsteady, three-dimensional and turbulence conditions. The indoor thermal comfort is analyzed with various discharge angles, β=45°, 50°, 55° and 60°. The thermal comfort is evaluated by EDT (effective draft temperature) and ADPI (air diffusion performance index) at ASHRAE Standard.
천장형 시스템 에어컨의 토출방향 변화에 따른 실내 열쾌적성 평가
이진형(Jin-Hyung Lee),김유재(You-Jae Kim),최원석(Weon-Seok Choi),박성관(Sung-Kwan Park),윤백(Baek Youn),김윤제(Youn-Jea Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
Modern people spend most of time at indoor space, such as office or classroom. Especially, occupants are exposed to the airtight indoor air quality (IAQ) for a long time. At present, many studies on the air-conditioning systems are more focused on the individual thermal comfort than the thermal efficiency due to increase of the concern of health. There are several factors which are influenced thermal comfort, such as temperature, humidity, convection and air movement, etc. Also, the individual factor, such as age, gender, physical constitution and habit, should be considered. The 4-way cassette type air conditioner is known to bring out better performance about thermal comfort than the traditional one. This study is performed on the higher ceiling environment than the common buildings or classrooms. Also, this study analyzed on the indoor thermal comfort by diffusing direction of 4-way cassette air conditioner with various discharge angles, 45°, 50°, 55° and 60°. Using a commercial code, FLUENT, three-dimensional transient air thermal flow fields are calculated with appropriate wall boundary conditions and standard k-ε turbulence model. Results of velocity and temperature distributions are graphically depicted with various discharge angles.
증례 : 감염 ; 결핵에 의한 시신경교차 거미막염 1예
박소은 ( So Eun Park ),김지범 ( Ji Beom Kim ),강보형 ( Bo Hyoung Kang ),안지현 ( Ji Hyun An ),김유재 ( You Jae Kim ),임현택 ( Hyun Taek Lim ),김성한 ( Sung Han Kim ) 대한내과학회 2012 대한내과학회지 Vol.82 No.5
Tuberculous optochiasmatic arachnoiditis (OCA) is a rare complication of tuberculous meningitis. We describe a 47-year-old female with tuberculous OCA confused with ethambutol-associated optic neuropathy. She was on anti-tuberculous treatment (i.e., isoniazid, rifampin, ethambutol, and pyrazinamide) for two months due to tuberculous meningitis. Visual impairment occurred during treatment, and ethambutol was changed to levofloxacin because of concern for ethambutol-associated optic neuropathy. Her visual impairment did not improve three months after anti-tuberculous treatment that excluded ethambutol, and she was referred to our hospital. Brain MRI showed enhancement of the optic chiasm and bilateral optic tract, and fundoscopy revealed bilateral optic nerve atrophy, suggesting tuberculous OCA. Her visual acuity was partially improved after anti-tuberculous treatment. Tuberculous OCA should be considered in addition to ethambutol-associated optic neuropathy for a patient with tuberculous meningitis who presents with visual impairment. (Korean J Med 2012;82:642-646)