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범용 로직 드라이버를 이용한 880Mbps ATE 핀 드라이버 구현
최병선,김준성,김종원,장영조,Choi Byung-Sun,Kim Jun-Sung,Kim Jong-Won,Jang Young-Jo 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.1
The ATE driver to test a high speed semiconductor chip is designed by using general logic drivers instead of dedicated pin drivers. We have proposed a structure of general logic drivers using FPCA and assured its correct operation by EDA tool simulation. PCB circuit was implemented and Altera FPGA chip was programmed using DDR I/O library. On the PCB, it is necessary to place two resistors connected output drivers near to the output pin to adjust an impedance matching. We confirmed that the measured results agree with the simulated values within 5% errors at room temperature for the input signals with 800Mbps data transfer rate and 1.8V operating voltage.
학동기 농촌 아동의 폐기능 정상 예측치와 호흡기 증상에 민감한 폐기능 지표
최병선,박정덕,홍연표,장임원,Choi, Byung-Sun,Park, Jung-Duck,Hong, Yeon-Pyo,Chang, Im-Won 대한예방의학회 1995 Journal of Preventive Medicine and Public Health Vol.28 No.3
Pulmonary function tests were conducted on 815 healthy primary school children (390 males and 425 female) in rural area using Collins Survey Spirometer (Warren E. Collins, Inc., U.S.A.) with X-Y Recorder. Respiratory symptoms(cough, sputum, sore throat, chest pain, chest tightness, dyspnea, coryza) were surveyed by the interviews. Multiple regression analysis and regression diagnostics were done for prediction equations of FVC, $FEV_1,\;PEFR\;and\;FEF_{25-75%}$. FVC, $FEV_1,\;PEFR\;and\;FEF_{25-75%}$ values in 3 groups of children classified by the number of symptom were compared each other through standard variable value. FVC, $FEV_1,\;PEFR\;and\;FEF_{25-75%}$ showed highly significant correlation with age, height and weight. Prediction equations for FVC, $FEV_1,\;PEER,\;FEF_{25-75%}$ are functions of height only in both male and female children aged between 6 and 12 years old. PEFR showed a significant difference related with the number of symptom in female. These results suggest that the PEFR is sensitive PFT parameter in this study.
최병선,박승수,김영환 ( Byung Sun Choi,Seung Soo Park,Yung whan Kim ) 한국공업화학회 1994 공업화학 Vol.5 No.5
가스분사반응기(Jet bubbling reactor)에서의 가스분사관의 최적 설계조건과 SO₂ 제거효율에 미치는 운전변수들의 영향을 검토하였다. 효과적인 기-액 접촉을 위한 가스분사관의 설계에 있어서 가장 중요한 인자는 Reynolds number로서 Reynolds number를 12,000 이상으로 하고 가스분사관과 가스분사구멍에서의 Reynolds number가 동일하게 되도록 가스분사관을 설계하는 것이 가스분사관 설계의 최적조건인 것으로 판단된다. △P, pH, 유입 SO₂농도, 석회석 입자크기등 공정의 운전변수 중에서 SO₂ 제거효율에 가장 큰 영향을 미치는 변수는 △P였으며 pH 4.0하에서 90% 이상의 SO₂ 제거효율을 얻기 위해서는 △P를 230mmAq 이상으로 유지시켜야 하였다. 실험결과 3.0 정도의 낮은 pH 하에서도 높은 SO₂ 제거효율이 얻어졌으며 이러한 이유는 강제산화에 의해 흡수액내의 HSO₃^- 이온이 SO₄^(2-) 이온으로 거의 완전한 산화가 일어나 흡수액 내의 SO₂ 평형분압이 매우 낮은 상태로 유지되었기 때문으로 생각된다. 또한 흡수액의 pH 5.0 이하의 조건에서는 SO₂ 흡수에 사용된 석회석의 입자크기에 관계없이 모두 99.5% 이상의 높은 석회석 이용률을 나타내었다. The optimum design conditions of gas sparger pipe and the effects of operating variables on SO₂ removal efficiency have been examined in Jet Bubbling Reactor. Geometry of gas sparger pipe of Jet Bubbling Reactor is a very important factor to obtain a effective gas-liquid contact. Test results revealed that Reynolds numbers at sparger and slot have to be kept greater than 12,000 identically at a given gas velocity. SO₂ removal efficiency was a function of △P, pH, inlet SO₂ concentration and particle size of limestone and was more sensitive to the change of △P than to the changes of others. The △P of at least 230mmAq must be maintained to acheive the above 90% SO₂ removal at pH of 4.0 which is considered as adequate operating pH. Higher SO₂ removal efficiency was obtained even at lower pH ranges, which resulted from the complete oxidation of the absorbed SO₂ to sulfates by adding air and consequently from the reduction of SO₂ equillibrium partial pressure in the gas-liquid interface. The 99.5% of the limestone utilization was attained in pH range from 3.0 to 5.0 with regardless to the particle size of limestone employed.
공동주택단지내 주동배치유형에 따른 외부공간 환경특성에 관한 연구-수지지구 공동주택단지를 중심으로-
최병선(Choi.byung-sun),정무용(Jung.Moo-Woong) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
The following of this study is to secure the out-door space of multiple-family housing, applying influential characteristic factors to compare by type, scale, out-door space spaciality, and setting the purpose of this research by analyzing the environmental character through a basis considering theoretical consideration. The process of the research is for idealizing and valuating a way to limit theoretical consideration and use the outdoor space to elevate the users life and quality. The method of this study is to utilize the outdoor space of multiple-family housing to secure an appropriate area for presenting an environmental character. Analyzing and adjusting the outdoor space spacial characteristics coming from the building's arrangement are last of all.