http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전희종,조대명 한국벤처창업학회 2024 벤처창업연구 Vol.19 No.1
The paper investigates the influence of government-led projects on investors' decision-making reference points, using Prospect Theory and Human Capital Theory. It empirically explores whether government initiatives shift investors' reference points, offering insights for private investments in government-backed ventures. The study, spanning from May 2017 to May 2022, compares 51 companies involved in Korea's 'New Deal' policy to 49 non-participating companies. It considers founders' human capital elements such as past startup experience, technical and managerial industry experience, education level, and graduate school reputation. The analysis reveals that only the reputation of the founder's graduate school has a significant negative effect, implying a conservative approach by investors towards government-led projects. This highlights the need for investors to consider the founder's social capital and the impact of government support on venture growth and public offering pace.
電力用 MOSFET을 利用한 三相 正弦波 PWM인버터의 變調信號에 관한 硏究
전희종,엄상오,문학룡,강범구 한국조명·전기설비학회 1991 한국조명·전기설비학회 학술대회논문집 Vol.1991 No.-
In this study, a new sinusoidal PWM inverter suitable for use with power MOSFETs is described. The output waveforms in the proposed PWM inverter are investigated both theoretically and experimentally. A modulating signal for the three-phase PWM inverter is obtained by adding 3nth harmonics to the conventional three-phase sine wave. By using the new modulating signal, the amplitude of the fundamental component is increased about 15 percent more than that of a conventional sine wave inverter and the commutation number of the inverter is decreased to two-thirds of a conventional one.
퍼지-신경회로망을 적용한 강인한 AC드라이브 시스템에 관한 연구
전희종,김재철,김병진,문학영,손진근,노남영,Jeon, Hee-Jong,Kim, Jae-Chul,Kim, Beung-Jin,Mun, Hark-Yong,Son, Jin-Geun,No, Nam-Young 한국조명전기설비학회 1997 조명.전기설비 Vol.11 No.1
본 논문에서는 퍼지제어기와 신경회로망 적응 관측기를 적용하여 강인성을 AC드라이브 시스템을 제안하였다. 퍼지제어기는 유도전동기의 속도 제어시 빠른 속도 응답 특성을 얻기 위하여 사용하였다. 신경회로망 적응관측기는 전동기 파라메터 변화에 대하여 강인한 제어 시스템이 되도옥 자속 관측기오 토오크 적응관측기로 구성하였다. 사용된 신경회로망은 자속과 토오크의 동특성을 학습시키기 위하여 역전파 알고리즘을 사용하였따. 컴퓨터 시뮬레이션의 결과를 통해 제안된 시스템이 전동기 파라메터 변동과 부화이론에 강인하고 속도응답 특성이 우수함을 입증하였다.
경요도전립선절제술 후 잔존 결석이 하부요로증상에 미치는 영향
전희종,정현철,송재만 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.6
Purpose: We investigated whether the removal of prostatic calculi, through a transurethral resection of the prostate(TURP), in benign prostatic hyperplasia(BPH), can improve the lower urinary tract symptoms(LUTS). Materials and Methods: Between March 2000 and February 2003, four hundred and thirty-two patients underwent TURP. Of these, one hundred and eighty-three were postoperatively evaluated with transrectal ultrasound(TRUS), International Prostate Symptom Score(IPSS) and uroflowmetry. The one hundred and eighty-three patients were divided into two groups, those with and without prostatic calculi. The group with prostatic calculi was further divided into three groups according to the location of the prostatic calculi(periurethral, periadenoma and diffuse types). The surgical outcomes were evaluated and compared between the two groups and according to the location of the prostatic calculi. Results: Prostatic calculi were detected in 108 of the 183 cases(59%). The mean patient age, prostate volume and serum prostate-specific antigen (PSA) level were no different between the two groups. Both groups, those with and without prostatic calculi, showed improvements of their LUTS after the TURP. The prostatic calculi group showed more significant improvements in the peak uroflow (Qmax), quality of life(QoL) and IPSS compared to those of the non- prostatic calculi group(p<0.05). In the prostatic calculi group, statistically significant differences were seen between the periurethral and periadenoma location types(p<0.05). Conclusions: These results suggest that the removal of prostatic calculi through TURP can improve the LUTS, and their locations are related to the operational results. Patients with symptomatic BPH, combined with prostatic calculi, seem to be strong candidates for surgical intervention, compared to those without prostatic calculi, for improvements of their LUTS
PWM 인버터의 DC 링크 맥동전압 제어에 의한 특정 고조파 제어기법
전희종,박재원,오종민,정을기,정인성 한국조명전기설비학회 1993 조명.전기설비 Vol.7 No.6
본 연구에서는 PWM 인버터의 DC 링크측 맥동전압 및 불평형 부하에 의한 부 고조파를 줄임과 동시에 특성 고조파 제거를 위한 기법을 제안한다.제안된 방법으로 DC 링크측 맥동전압에 의한 고조파를 제거하기 위해 피드포워드 제어방식(feedforward control method)을 채택하여 적절한 변조지수가 선택되도록 하였다. 또한 특정 고조파(selected harmonics)를 제거하기 위하여 출력전압에 따라 필요한 최적의 해를 결정한 후, 이를 ROM에 저장하여 인출하는 방식을 도입하였다.본 연구의 타당성을 입증하기 위하여 필요한 값들을 이론적으로 구하고 컴퓨터 시뮬레이션을 행하여, 파이롯트 시스템을 구현하여 DC 링크측 맥동전압이 존재할 때 제안된 기법으로 맥동전압에 의한 고조파와 특정 고조파들이 제거됨을 증명하였다. In this paper, we study the effects that the variations of machine parameters and frequency of which affect the instability occured in induction motors when operated at low speed or light load, by obtaining the locus of dominant root for the characteristic equation.