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임상수(Sang Su Lim),김정철(Jeong Cheol Kim),정은성(Eun Sung Chung),박성호(Seong Ho Park) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
유도전동기는 특유의 간단한 구조로 인해 다른 타입에 비해 경쟁력있는 비용과 취급의 용이성이 뛰어나지만 타 전동기에 비해 제어가 쉽지 않다. 하지만 최근 인버터 제어기술의 발달에 힘입어 유도전동기가 철도차량을 비롯한 산업 전반에 걸쳐 널리 쓰이고 있다. 특히 철도차량용 전동기는 속도 변화가 빈번하여 인버터의 정밀한 제어가 요구되는데 이를 위해 견인전동기의 정확한 파라미터 확인은 필수적이다. 전동기 파라미터를 확인하는 방법으로는 시뮬레이션법과 시험을 통한 확인법이 있는데 시뮬레이션법은 계산 오차로 인해 실제 파라미터와 차이가 있고 시험을 통한 확인법은 비교적 정확하나 계산방법이 다양하여 적절한 시험법을 찾는 것이 중요하다. 본 논문에서는 철도차량용 견인전동기에 적합한 파라미터 확인 방법을 제시하고 인버터 제어에 활용하여 검증하고자 한다. Induction motor is known as competitive price, easy to maintenance and hard to its control. But the induction motor is normally used now in whole industry including rolling stock due to its control technology advancement. It is very important to know exact parameters of the induction motor to accurately control it. There are two methods to know the parameters of the induction motor, simulation method and test method. Simulation method is easy to check the parameters, but not accurate. On the other hand, test method is accurate, but there are several methods according to the calculation. So it is important to know that which calculation method is best for induction motor of rolling stock. This paper shows that which method is suitable to check the parameters of induction motor.
말초혈액단핵구에서 아토피에 따른 GATA-3, c-maf, T-bet의 발현차이
신재민 ( Jae Min Shin ),임상수 ( Sang Su Lim ),홍구현 ( Gu Hyun Hong ),이호연 ( Ho Yeon Lee ),김남의 ( Nam Eui Kim ),지영구 ( Young Koo Jee ) 대한천식알레르기학회 2007 천식 및 알레르기 Vol.27 No.2
Background & Objective: GATA-3 and T-bet are now considered as master transcriptional factors involving Th cell differentiation, but the roles of these factors are still uncertain in vivo. The study was to investigate the expression of these transcription factors in the peripheral blood mononuclear cells (PBMC) according to atopic status. Method: PBMCs were obtained from non-atopic controls, atopic controls, allergic rhinitis patients, atopic asthmatics, and non-atopic asthmatics. PBMCs were cultured for 48 hours, and then 12-o-tetracanoylphorbol-13-acetate (PMA) and calcium ionophore (ionomycin) were added. Expressions of mRNA of cytokines, GATA-3, c-maf and T-bet were measured by RT-PCR. Result: T-bet was expressed higher in the non-atopic controls that in the other groups. GATA-3 was expressed higher in the atopic controls, allergic rhinitis patients and atopic asthmatics, but lower in the non-atopic controls. Non-atopic asthmatics showed similar levels of expression of T-bet with atopic asthmatics, but significantly lower level of expression of GATA-3 than atopic groups. Conclusion: This study suggest that transcription factors, especially GATA-3, reflect or may be related to atopic status. (Korean J Asthma Allergy Clin Immunol 2007;27:90-97)
자동차 천정 성형 공장에서 발생한 Methylenediphenyl Isocyanate에 의한 직업성 천식 2예
양주연 ( Ju Yeon Yang ),정인국 ( In Kook Jeong ),임상수 ( Sang Su Lim ),홍구현 ( Gu Hyun Hong ),신재민 ( Jae Min Shin ),노상철 ( Sang Chul Rho ),김윤섭 ( Youn Seup Kim ),박재석 ( Jae Seuk Park ),지영구 ( Young Koo Jee ) 대한천식알레르기학회 2006 천식 및 알레르기 Vol.26 No.4
Since isocyanate-induced occupational asthma (OA) was first reported about 50 years ago, the first case of methylenediphenyl isocyanate (MDI)-induced OA was reported in 1973. Although toluene diisocyanate (TDI)-induced OA is the most common OA, MDI-induced asthma has been very rarely reported in Korea. Here we report two cases of MDI-induced OA developed in the molding lining of automobile industry. Two patients who had worked at the molding lining using MDI for several years presented with cough and dyspnea. The metacholine bronchial provocation tests of two patients were positive (PC20 : 1.51 mg/mL and PC20 : 1.28 mg/mL, respectively). The bronchial provocation tests with MDI showed early response. MDI aerosol was generated by heating MDI to 100℃ with heat block. Skin prick tests were all negative to common inhalent allergens and MDI. The level of serum total IgE was within the normal range. They are now well-controlled state with persistent medication and changes of working place in the same company. (Korean J Asthma Allergy Clin Immunol 2006;26:314-317)