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벡터드라이버를 이용한 편측형 선형유도전동기 구동특성에 관한 연구
장용해,임홍우,신사현,조금배,백형래 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
The input voltage of Single-sided linear induction motors (SLIMs) is involved with the time harmonics because most LIM is driven by inverter. Therefore the equivalent circuit for an inverter-fed SLIM has t o be modifided to represent every harmonic present in supply voltage. This paper describes that the dynamic characteristic can be used effectively for analyzing the characteristics of a single-sided linear induction motor using vector driver for PI controller.
조만석,지용철,황성수,조수호,김승래 慶北大學校 醫科大學 1978 慶北醫大誌 Vol.19 No.2
저자등은 수회의 뇌지주막하 출혈을 일으킨 환자에서 입원동안 절대안정, 약물에 의한 적절한 혈압강하 및 EACA의 대량 정주로서 가료중 반복시행한 뇌혈관 조영술상에서 폐색을 일으켜 소실된 전교통 동맥류 2예를 치험하였다. Authors report two cases of cerebral aneurysms which in the serial angiograms were spontaneously occluded during conservative treatment; absolute bed rest, antifibrinolytic drug and control of blood pressure with hypotensive drugs. Each aneuryem developed on anterior communication artery and had two or three episodes of bleeding attack during conservative treatment.
Yong Kyun Kim,Chung-Lae Cho 한국학술연구원 2021 Korea Observer Vol.52 No.1
A growing number of governments around the world at both national and subnational levels have shored up their efforts at attracting foreign direct investment (FDI) by setting up an investment promotion agency (IPA). A newly emerging literature has sought to ascertain if and how such agencies have fulfilled their missions. In this article, we seek to move it forward by making two contributions. First, taking advantage of the Foreign-Business Friendliness Index (FBFI) data that cover all district-level local governments in South Korea, we are able to conduct a comprehensive study of local IPAs within a single country. Second, the detailed information in the data also enables us to examine precisely which organizational structures and activities of the IPAs are most responsible for the enhanced FDI performance. Key findings suggest that the way IPA s internal organizational structure is set up matters. Specifically, we show that IPAs that have an IP committee in conjunction with a designated IP department significantly outperform those that do not have both at the same time.
Simulation of an Adjustable Speed Drive with PWM AC-DC-AC Converter-Fed Synchronous Machine
Cho, Geum-Bae,Oh, Geum-Kon,Baek, Hyung-Lae,Jeong, Sam-Yong CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.2
The synchronous machine is compatible to the induction motors for a large drive system, like a pumping loads of plants, on its economic, simple implementation and reliability. Also, the synchronous motor and the PWM converters have some advantages such as unity power factor, low harmonic and evergy regeneration. This paper presents simulation results of adjustable speed drive system of a synchronous motor supplied by a PWM ac-dc-ac converter under controlling of incorporated "volts/Hz" and "separated d-q voltage vector controllers". The former is used to operate the synchronous motor near unity power factor by controlling the voltages of d and q axes separately.System modeling and simulation were performed under the environment of commercial software MATLAB/SIMULINK package.