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L-N-Benzylaspartic acid의 선택적 에스테르화 반응
이채호,김일광,박승화,이영행,정봉영 圓光大學校 基礎自然科學硏究所 1987 基礎科學硏究誌 Vol.6 No.1
Selective esterification and synthesis of L-N-benzylaspartic acid from L-aspartic acid are described. L-Aspartic acid was transformed into dibenzyl L-asparate p-toluenesulfonate, which was treated with sodium bicarbonate to afford dibenazyl L-asparate. Formation of Schiff base of dibenayl ester with benzaldehyde and subsequent hydrogenation-dehydrogenation of the Schiff base produced L-N-benaylaspartic acid. L-N-Benaylaspartic adcid was transformed into L-N-benzylaspartic anhydride hydrogen bromide, which was treated with methyl alcohol and benzyl alcohol to afford a-methyl and a-benzyl L-N-benzylaspartate and L-N-benaylaspartic acid was transformed into L-N-benaylaspartic acid copper(Ⅱ) salt, which was treated with N,N,N,N-tetramethylguanidine and benzyl bromide to afford β-benzylaspartate
성공적인 eCRM, CRM을 위한 유전자알고리즘의 혼합 초기화법을 이용한 데이터마이닝
강래구,김승언,정채영 朝鮮大學校 統計硏究所 2006 統計硏究所論文誌 Vol.8 No.1
고객관리가 기업의 성패를 좌우하는 중요한 화두로 떠오르면서 보다 쉽고 편리하게 고객의 다양한 Pattern을 발견하고 예측하기 위해 많은 기업들이 CRM과 eCRM을 빠르게 도입하고 있다. 과거엔 고객관리가 통계학자들이나 전문적인 통계패키지에 의해 관리되어 왔으나 IT 분야의 급격한 발달을 기반으로 통계적 과정을 자동화시킨 Data Mining 기법으로 점점 대체되고 있는 추세이다. 이러한 Data Mining이 대표적으로 이용되고 있는 분야가 CRM, eCRM이다. Genetic Algorithm을 이용하여 Data Mining을 적용함에 있어서 본 논문에서는 무작위 초기화법과 유도된 초기화법을 동시에 사용하는 새로운 집단 초기화 방법을 적용하여 A할인점의 2004년과 2005년도 우수고객을 예측하였고 실제 고객 데이터와의 비교를 통해 본 논문에서 제안한 새로운 집단 초기화 방법의 성능을 입증하였다.
Jung, Seung Chai,Yoon, Bye-Ri,Oh, Jin Sun,Choi, Seung Hong,Han, Moon Hee,Lee, Jang Yeol,Cho, Hye Rim,Rhee, Kyehan,Jho, Jae Young Ovid Technologies (Wolters Kluwer) - Lippincott Wi 2012 ASAIO journal Vol.58 No.5
<P>In this study, we propose a new method for the enhancement of intraarterial thrombolysis by use of an endovascular vibrating polymer actuator probe (VPAP), which is fabricated from an ionic polymer metal composite (IPMC) actuator. The endovascular VPAP was fabricated by combining 0.8 0.8 10 mm3 IPMC samples, 0.22 mm 50 cm copper wires, and 40 cm of Teflon tube. The purpose of this study was to evaluate the thrombolysis efficiency of an endovascular VPAP in a dog model. Both renal arteries of the enrolled dogs (n = 5) were used in the current study. A distal portion of the renal artery in a mongrel dog was occluded by a blood clot from autologous venous whole blood. Intraarterial thrombolysis was performed by use of a VPAP without the actuation force (control group), by a VPAP-only (VPAP-only group), or with a combination of recombinant tissue plasminogen activator (rtPA) and a VPAP (VPAP + rtPA group). The thrombolysis efficiency was evaluated by the modified Thrombolysis in Myocardial Infarction (TIMI) grading system based on the consensus between two radiologists. The grading scales were compared according to each intraarterial thrombolysis method. The VPAP + rtPA and VPAP-only groups showed a significantly higher thrombolysis efficiency than did the control group (p < 0.05). The VPAP-only group also showed a significantly higher thrombolysis efficiency than did the control group (p < 0.05). The VPAP+ rtPA group showed a significantly higher thrombolysis efficiency than did the VPAP-only group (p < 0.05). The use of an endovascular VPAP was a feasible and useful method for intraarterial thrombolysis, and it enhanced the thrombolysis efficiency when combined with the thrombolytic agent rtPA.</P>
채승희(Seung-Hee Chai),이병화(Byeong-Hwa Lee),도상화(Sang-Hwa Do),홍정표(Jung-Pyo Hong),설승기(Seung-Ki Sul),김상민(Sang-Min Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper design a motors well adapted to position sensorless control method based on the high frequency signal injection and proposes a direction to design for sensorless control in interior permanent magnet synchronous motor(IPMSM) as a type of winding. In sensorless control, controller calculates the position of rotor at smallest d-axis inductance from high frequency injection. In order to satisfy this characteristic, this paper designs a motor as a type of winding. Distributed winding is good for sensorless control, because it has low saturation in iron core and better flux distribution than concentrated winding’s. Inductance is calculated by the FEM using frozen permeability method and voltage equations of d-q axis are used to analyze characteristics of IPMSM such as torque, output power, current angle and efficiency.
DOC-DPF-SCR 시스템에 의한 디젤 배기 내 NO<SUB>x</SUB>, 입자상 물질 저감 과정의 일관 모델링 및 성능 예측
정승채(Seung-chai Jung),윤웅섭(Woong-sup Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Computer methods employing simplified mathematical models with empirically tuned model parameters can be efficiently practiced into an optimization of a diesel aftertreatment system. Components of prime interests are diesel particulate filter, diesel oxidation catalyst and de-NOx catalytic converter. de-NOx, de-PM, and de-HC processes in each member unit are separately modeled, formulated and then combined into an integrated analysis procedure for a unified prediction of the diesel emission aftertreatment. The unified model is empirically tuned and validated with comprehensive engine and laboratory data. Parametric studies to investigate the effects of emission species and space velocity on the NOx and soot reductions are conducted. A lowered NO₂/NO, ratio after PM oxidation in DPF contributes to promote the NOx reduction by SCR at intermediate gas temperatures. In contrast, NOx reduction is inert to the PM oxidation at high temperatures. Rate of PM accumulation appears to be a strong function of temperature and NOx concentration.
열, 첨가제, 촉매에 의한 DPF내 포집된 입자상 물질 재생 모델링
정승채(Seung-chai Jung),윤웅섭(Woong-sup Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
DPF reduce particulate emission by physically trapping the particles and the collected PM has to be periodically or continuously removed from the filter by a regeneration process. One of the major issue for DPF system is developing a safe and effective regeneration strategy. In the present study, PM oxidation by heat, fuel additive and catalyzed filter was studied. One-dimensional mathematical models describing regeneration and filtration process were developed. These models can produce spatio-temporal evolution of filter temperature, pressure drop and mass of PM remained in the filter during regeneration. Models are calibrated by measured data and simulation results showed good agreement.
정승채(Seung-chai Jung),윤웅섭(Woong-sup Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Particulate filter system has been developed to cope with tight diesel PM emission regulations. One of the major issue for DPF system is developing safe and effective thermal regeneration strategy because any PM oxidation methods without additional heat source do not ensure lasting permissible back-pressure level under all engine operation condition. In the present study, thermal regeneration process of wall-flow DPF has been studied using one-dimensional model. Regeneration model consists of mass, momentum and energy conservation equation. Heat generation by particulate matter oxidation was modeled through heterogeneous global carbon reaction. This model can produce spatio-temporal evolution of filter temperature, distribution of particulate layer thickness and mass of PM remained in the filter during regeneration. Simulation results were compared to three different experimental data and showed good agreement, therefore this model can be used to develop thermal regeneration strategy.
고주파 신호주입을 이용한 센서리스 구동용 고출력밀도 매입형 영구자석 동기전동기의 설계
채승희(Seung-Hee Chai),이병화(Byeong-Hwa Lee),홍정표(Jung-Pyo Hong),설승기(Seung-Ki Sul),이근호(Geun-Ho Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper estimates inductance profile well adapted to position sensorless control method based on the high frequency signal injection and proposes a direction to design for sensorless control in interior permanent magnet synchronous motor(IPMSM) having a high density output power. In sensorless control, controller calculates the position of rotor at smallest d-axis inductance from high frequency injection. In order to satisfy this characteristic, this paper designs a motor having a large magnetic loading and a small electric loading. Inductance is calculated by the FEM using frozen permeability method and voltage equations of d-q axis are used to analyze characteristics of IPMSM such as torque, output power, current angle and efficiency.
정승채(Seung-chai Jung),윤웅섭(Woong-sup Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel oxidation catalyst (DOC) is a widely used device to reduce harmful species of exhaust gas with less engine back pressure. A one-dimensional model simulating the oxidation of CO, HC and NO was developed to predict the state of gaseous emission exiting a DOC. The model formulation is based on the constraint of conservation of mass, species and energy inside DOC. Kinetics of CO, HC and NO were modeled assuming global reaction using inhibition factor. Steady-state experimental data covering a wide range of operating conditions calibrates the model parameters. The results showed good agreement with the experimental data in a test window of 200℃~500℃ for temperature and 0.1㎥/s~0.7㎥/s for volumetric flowrate.