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발사체 공력해석 프로그램 RocketAeroMaster2005 개발
김재수,김종록,우철훈,김태훈,임오택,박정주,오범석,옥호남 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
예비설계 단계에서 외형설계, 구조설계를 위한 하중분포 계산, 발사체의 안정성 및 성능분석을 위하여 데이터베이스형 발사체 공력코드를 개발하였다. 분석방법으로는 동체, 스트랩온 부스터의 공력계수와 동체와 스트랩온 부스터의 간섭 동의 분석을 거쳐 전체 발사체에 대한 분석이 이루어졌다. 발사체 공력코드의 데이터베이스구성은 기존의 DATCOM의 데이터베이스를 기반으로 발사체 형상에 대한 실험데이터(MD)를 추가 구성함으로서 발사체 공력코드의 신뢰성을 증대시켰다. 또한, 기존의 발사체 공력설계코드와 비교 분석을 수행하여 발사체 공력코드를 검증하였다. For the development of launch vehicle, the aerodynamic characteristics have to be performed for the configuration design in the preliminary design, the load distribution in the detail design, and the performance analysis. The static and dynamic coefficients are analyzed for strap on booster, body and strap on booster-body interface characteristics. A detail analysis is required during the detail design phase, but a rapid analysis is better in the preliminary design. Therefore, the database code, based on the theory and experimental datum, is useful to analyze the variety of models during the preliminary design phase, and the computational aerodynamic code is required to calculate the detail load distribution during the detail design phase. In this computational aerodynamic code, based on the database of theoretical and experimental datum, have been developed.
14.6 A GeV ^28Si 중이온이 원자핵건판내에서 발생시킨 핵반응에서 생성된 2차입자의 발생각 분포
김종오,김태연,남신우,신택수,우종관,이세병,임계엽,장세덕,조재희,천병구,임인택,김기영 慶尙大學校 기초과학연구소 1990 基礎科學硏究所報 Vol.6 No.-
14.6A GeV^28Si 중이온이 원자핵 건판내에서 발생시킨 N_h=1인 핵반응에서 생성된 47개의 파쇄 α 입자와 537개의 단일하전 2차입자의 발생각들을 측정하여 변수 exp(γ-η_b)의 포괄적 분포를 회귀함수 dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}로 적합시켰다. 여기서 의사신속도 γ=arctanh(cosθ)=-ln tan(θ/2)이고, 입사 중이온의 신속도 η_b=3.445이다. 그 적합결과 파쇄 α입자의 경우 χ=-0.052±0.011이고, 파쇄 p입자의 경우 χ=-0.141±0.015이었다. For LS emission angles of 47 α fragments and 537 single-charged shower particles, produced by the N_h (the number of heavyprongs)=1 interactions of 14.6 A GeV^28Si nuclei in the nuclear emulsion, the distribution of the parameter exp(γ-η_b) is well expressed by dN=exp[a+χ{exp(γ-η_b)d{exp(γ-η_b)}with χ=-0.052±0.011 for αfragments and χ=-0.141±0.015 for p 'fragments', where the pseudorapidity of secondaries γ=arctanh(cosθ)=-ln tan(θ/2) and the rapidity of incident heavy ions, η_b=3.445.
Effects of insulin glulisine as mono- or add-on therapy in patients with type 2 diabetes mellitus
Kawamori, R.,Iwamoto, Y.,Kadowaki, T.,Iwasaki, M.,Kim, S.-W.,Woo, J.-T.,Baik, S.-H.,Yoon, K.-H. Blackwell Publishing Ltd 2009 DIABETES OBESITY AND METABOLISM Vol.11 No.9
<P>Aim</P><P>To evaluate the safety and efficacy of insulin glulisine (glulisine) with and without oral antidiabetic drugs (OAD; sulphonylurea or sulphonylurea + biguanide) relative to that of OAD alone in Japanese and Korean patients with inadequately controlled type 2 diabetes mellitus (T2DM).</P><P>Methods</P><P>In an open, randomized, parallel-group, comparative, controlled trial, 387 patients were randomized and treated with glulisine + OAD (n = 130), glulisine monotherapy (n = 127) or OAD only (n = 130) for 16 weeks. Glulisine was self-injected subcutaneously three times daily (0–15 minutes before meals) at a starting dose of ≥0.2 U/kg/day. Patients titrated the glulisine dose to achieve a 2-h postprandial plasma glucose (2h-PPG) level of 7.1–9.5 mmol/l (128–172 mg/dl) by administering at least one additional unit at each appropriate meal time if the 2h-PPG level was > 9.5 and < 11.1 mmol/l (> 172 and < 200 mg/dl) and by administering at least two additional units if the 2h-PPG level was ≥ 11.1 mmol/l (≥ 200 mg/dl). Therapy with OAD was continued at the stable baseline regimen. The primary efficacy endpoint was change in haemoglobin A<SUB>1c</SUB> (HbA<SUB>1c</SUB>) from baseline to endpoint in the intention-to-treat population.</P><P>Results</P><P>At baseline, therapy with OAD was a sulphonylurea only and a sulphonylurea + a biguanide in approximately 24 and 76% of patients respectively. Both glulisine groups had larger reductions in adjusted mean HbA<SUB>1c</SUB> than the OAD-only group (glulisine + OAD, −2.07%; glulisine monotherapy, −1.25%; OAD only, −0.61%). Superiority of glulisine + OAD and glulisine monotherapy vs. OAD only was shown by differences in adjusted mean HbA<SUB>1c</SUB> change from baseline values of −1.46% (p < 0.0001) and −0.64% (p < 0.0001) respectively. Both glulisine groups had better 2h-PPG control than the OAD-only group. Mean daily glulisine doses increased from baseline to endpoint (glulisine + OAD, 13.3–22.5 U; glulisine monotherapy, 14.2–38.0 U). The rate of all symptomatic hypoglycaemia events per patient-year in the entire treatment phase was 11.9 in the glulisine + OAD group, 8.8 in the glulisine monotherapy group and 1.7 in the OAD-only group. There was only one event of severe hypoglycaemia, which occurred in the glulisine + OAD group. Efficacy and safety were similar in Japanese and Korean subpopulations.</P><P>Conclusions</P><P>Both glulisine + OAD and glulisine monotherapy were well tolerated and effective for Japanese and Korean patients with T2DM mellitus inadequately controlled by OAD therapy alone.</P>
공진형 FB DC-DC 컨버터의 정출력 제어에 관한 연구
우정인,노인배,노태균,김구형,황영민 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
Due to the development of information communication field not only the industrial electric machinrye but also the electronic·communication machinry including the computer and satelite, the interests for SMPS are increasing. Thus the low loss converter which can be operated in high speed switching is require. In this paper, a control strategy for the constant output power of resonant FB DC-DC converter in variable input voltage is proposed. The proposed control of system is I-PD type control applying type 1 digital system. The output voltage tracks the reference without any steady state error even in variable input voltage. The validity of proposed control strategy is verified by simulations using PSIM.
우정인,김춘삼,노태균,신동률 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.1
In this paper, we proposed the thrust decoupling control of PWM Inverter-fed Single-sided Linear Induction Motor(hereinafter referred to as "SLIM") with the Space Vector controller and PI controller in the conveyance systems. The voltage equations of SLIM are expressed on the suitable α-β axis equivalent circuit, which can be analyze characteristics of the thrust and the normal force and so on. These control methods of the slip angular frequency control and the thrust decoupling control by analyzing these parameters can be successfully driven without interfering of each axis. These results exemplified the linear drive of SLIM with the reference value, and the thrust were verified by the experiments.
김진영,김영성,원재광,윤순창,우정헌,조규탁 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
Lake Paldang is a main resource of drinking water for 20 million people in the greater Seoul area. Dry deposition amounts of nitrogen and sulfur were estimated for three typical days in each season over the watershed of Lake Paldang. Models-3/CMAQ (Community Multiscale Air Quality) and MM5 (Mesoscale Model) were used to predict air quality and meteorology, respectively. Aerosols as well as gaseous pollutants were considered. Nitrogen was mainly deposited in the form of HNO₃ while most of sulfur was deposited in the form of SO₂. Contribution of secondary pollutants was the largest in fall since they were transported from the greater Seoul area. However, contribution of secondarily-formed particulate pollutants to the nitrogen deposition was the largest in winter because semi-volatile ammonium nitrate favors lower temperature. Annual deposition amounts of nitrogen and sulfur were 37% and 26% of their emission amounts, respectively, over the watershed of Lake Paldang. Higher value of the nitrogen deposition showed a more influence of pollutants emitted in the greater Seoul area.