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서영수,손효석,전형식,정희택,Seo, Young-Soo,Son, Hyo-Sok,Chun, Hyong-Sik,Chung, Hee-Taeg 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.2
The pump safety related to the functions in nuclear power plants must be designed to meet load conditions considering seismic requirements. In order to satisfy both structural integrity and operability of these pumps, the initial step in the seismic qualification is to establish the resonant frequencies of the structure. Applications we made to the design of the vertical and horizontal type pump. Computational results are analyzed with respect to the dynamic characteristics and are compared to the expected design requirements.
콘텐츠 소프트웨어 개발 환경을 위해 확장된 익스트림 프로그래밍 방법
서영수,정헌,강병욱,Seo, Yeung-Su,Jung, Hun,Kang, Byung-Wook 한국정보컨버전스학회 2008 한국정보컨버전스학회논문지 Vol.1 No.1
소프트웨어 개발 프로젝트를 수행할 때 가장 중요한 것은 개발 기간 내에 계획된 품질의 결과물을 얻는 것이다. 특히 배포 시기와 품질에 민감한 콘텐츠 소프트웨어 개발의 경우 프로젝트가 연기되거나 원하지 않는 품질의 결과물이 나오게 되면 바로 전체 프로젝트의 실패로 연결된다. 익스트림 프로그래밍 기법은 개발 기간이 중요한 프로젝트의 위험 요소를 줄이기 위해 보다 작은 단위로 개발 주기를 나누는 방법이다. 본 논문에서는 콘텐츠 소프트웨어 개발 환경을 위해 개발 기간과 품질이라는 두 가지 주요 요소를 동시에 고려할 수 있는 확장된 익스트림 프로그래밍 방법을 제안한다. 제안하는 기법은 개발 프로젝트 진행 중에 제안되는 잉여 아이디어의 문서화 장치와 페어 프로그래밍 기법을 확장하여 다중 역할 모델을 적용하는 방안이다. When performing a software development project, the most important thing is building a result with planned quality within development period. Particularly, if the project is delayed or has no good quality in the case of the content software development project which is sensitive to the release time and quality, it is immediately connected to the failure of the whole project. Extreme programming is a methodology that divides the development cycle into smaller units for reducing the risk factor of the project in which the development period is important. In this paper, we suggest the expanded extreme programming which can consider the development period and quality at the same time for content software development environment. The suggested methods are documentation mechanism that is upcoming during the development project and multiple role model which is extended from pair programming method.
서영수(Young-Soo Seo),손동휘(Dong-Hwi Son),박근(Keun Park) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
High-frequency induction is an efficient way to heat mold surface by electromagnetic induction in a non-contact manner. Thanks to its capability of rapid heating and cooling of mold surface, it has been recently applied to the injection molding. The present study applies the high-frequency induction heating for elimination of weldlines in an injection-molded plastic part. To eliminate weldlines, the mold temperature of the corresponding weld locations should be maintained higher than the glass transition temperature of the resin material. Through experiments, the maximum temperature of 143℃ is obtained on the mold surface around the elliptic coil, while the temperature of the mold plate is lower than 60℃. An injection molding experiment is then performed with the aid of induction heating, and the effect of induction heating conditions on the surface appearance of the weldline is investigated.
폐루프 자속추정기를 이용한 유도전동기의 센서리스 벡터제어
서영수(Young-Soo Seo),임영배(Young-Bae Lim),음두성(Doo-Seong Eum),이상훈(Sang-Hun Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
In this paper, for high performance as drive, in the speed sensorless vector control of induction motor, introduced flux estimator of voltage model and error compensation algorithm using closed loop integration method, and then we proposed a improved flux estimation method of high accuracy. And the rotor speed is estimating using the stator current and the estimated flux, it is used speed information. The proposed scheme is verified through digital simulations and experiments for 3.7[㎾] induction motor and shows good dynamic performance.<br/> <br/>
부하토크 피드포워도 제어를 이용한 유도전동기의 속도제어
서영수(Young-Soo Seo),임영배(Young-Bae Lim),김영춘(Young-Chun Kim),성대용(Dae-Yong Sung),김종균(Jong Gyun Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
This thesis proposed a speed control system for induction motors robust to variations in torque and parameters by feeldorward compensating the current portion of load torque adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system.<br/> In conclusion, this thesis demonstrate the improved transient characteristic to variations in reference speed and load torque, compared to the conventional PI control method, by means of the feedforward control of the estimated load torque.
서영수(YS Seo),이춘상(CS Lee),황락훈(LH Hwang),김종래(JL Kim),이상용(SY Lee),김주래(JL Kim),조문택(MT Cho) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In order to the torque control, the indirect flux control was performed by controlling the ratio of elf, and the q-axis flux was estimated by the slip command and q-axis current in the rotor circuits. Also, the frequency was controlled to keep on the q-axis flux to be zero, and the constant torque characteristics could be obtained by generation the preset torque<br/> In the induction motor driven by voltage source inverter with the constant voltage and frequency, the speed variation is expressed as a slip. So, the speed control can be achieved by slip<br/> compensation. The slip was calculated with a q-flux current filtered by first-order filter, and, as the result, the error problem which may occur in current detection Was eliminated.