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능동보조회로를 이용한 전압형 PWM 인버어터 시스템에서의 커먼 모드전압과 고주파 누설전류 억제방법에 관한 연구
진진휘(Jin-whi Jun),박성준(Sung-Jun Park),김광태(Kwang-Tae Kim),김철우(Cheul-U Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
Tills paper propose a ˝common mode voltage damper" that is capable of reducing the common mode voltage produced in the PWM VSI. An push-pull circuits and high frequency leakage current damper[l] are incorporated into the "common mode volatge damper", the design method of which is presented. Effect of "common mode voltage damper"is simulated in this paper verifies the vlability and effectiveness in 22kW induction motor drive using IGBT inverter. Simulated results show that "common mode voltage damper" makes significant contributions to reducing a high frequency leakage current.
PWM 인버어터 구동된 유도 전동기에서의 커먼모드 전압, 전류의 저감방법에 관한 연구
전진휘(Jin-Whi Jun),이상훈(Sang hun-Lee),박성준(Sung-Jun Park),김광태(Kwang-Tae Kim),김철우(cheul-U Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
This paper propose an "Active common-mode voltage damper circuit" that is capable of reducing the common-mode voltage produced in the PWM VSI. An half-bridge PWM inverter circuit and high frequency transformer are incorporated into the "Active common-mode voltage damper", the design method of which is presented. Effect of "Active common-mode voltage damper"is simulated in this paper verifies the viability and effectiveness in 2.2[kW] induction motor drive using IGBT inverter. Simulated results show that "common mode voltage damper" makes contributions to reducing a high frequency leakage current and common-mode voltage
Beneficial effect of EDTA for canine parthenote development during in vitro culture
Haeyun Jeong,Jin-Gu No,Whi-Cheul Lee,Hayeon Wi,Sun A Ock,Jae-Seok Woo,Seunghoon Lee 한국수정란이식학회 2018 한국수정란이식학회 학술대회 Vol.2018 No.11
In vitro culture (IVC) can be used for a variety of assisted reproductive technologies. However, IVC in dog has been low efficient compared to other mammalian. It is believed that an embryo developmental block in IVC embryos is cause of low production efficiency. There is no study of embryo developmental block in dog yet. In this study, we attempted to estimate the beneficial role of EDTA in canine parthenogenic (PA) embryos development to overcome embryo developmental block. The PA embryos were divided into EDTA treated and non-treated groups. Embryo developmental efficiency was measured by activating chemically parthenote. After EDTA induction, PA embryos were evaluated for embryonic development, ROS activity, mitochondrial integrity, ATP production and genomic activation. The EDTA treated PA embryos showed significantly higher survival rate and improved cavity formation compared to non-treated. Moreover, cytoplasmic ROS level was mitigated and mitochondrial membrane potential was found significantly higher in EDTA treated group followed by higher ATP production. Furthermore, major embryonic genomic activation specific markers/factors were also elevated in EDTA treated group. Conclusively, these results indicated that EDTA showed substantially positive effect to overcome embryo developmental block in canine.
전동기 파라미터 온라인 보상을 갖는 유도전동기의 벡터제어
이상훈(Sang-Hun Lee),전진휘(Jin-whi Jun),박성준(Sung-Jun Park),박한웅(Han-woong Park),김철우(Cheul-U Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
유도전동기 벡터제어의 특성 개선을 위하여 벡터제어의 문제점을 개선할수 있는 저항보상 알고리즘을 적용해 보았다. 이 알고리즘에서 저항변동의 추정 및 보상은 유도전동기의 단자전압과 전류를 바탕으로 동기좌표계에서 저항변동분을 추정하고 그 처정값을 간접벡터제어 슬립계산기의 이득값과 전향보상항에 포함된 고정자 저항값을 보상하는 방법을 이용하였다. 그리고 지령속도에 대한 추정속도의 응답시간지연 및 과도상태동안의 토오크의 맥동현상은 적옹한 알고리즘을 실해함으로 해서 응답시간지연을 줄이고 토오크의 맥동현상이 개선될수 있음을 보일 수 있었다.
Effect of EDTA on canine parthenote development during in vitro culture
Haeyun Jeong,Minghui Zhao,Jin-Gu No,Imran Ullah,Whi-Cheul Lee,Hayeon Wi,Sun A Ock,Jae-Seok Woo,Tai-young Hur,Gi-sun Im,Jong-Gug Kim,Seunghoon Lee 한국수정란이식학회 2018 한국동물생명공학회지 Vol.33 No.3
Somatic cell nuclear transfer (SCNT) is a useful biotechnological tool for animal cloning. Until now, SCNT has been inefficient, especially in dog. It is believed that an embryo developmental block in SCNT embryos is cause of low production efficiency. However, no studies have been performed on canines for embryo developmental block. In this study, we attempted to evaluate the beneficial role of EDTA in canine parthenogenic (PA) embryos development to overcome embryo developmental block. The PA embryos were divided into 0.01 mM EDTA treated and non-treated groups. Embryo developmental efficiency was measured by activating chemically parthenote. After EDTA induction, PA embryos were evaluated for embryonic development, Reactive Oxygen Species (ROS) activity, mitochondrial integrity, ATP production and genomic activation. The EDTA treated PA embryos showed significantly higher survival rate and improved cavity formation compared to non-treated. Furthermore, cytoplasmic ROS level was mitigated and mitochondrial membrane potential was found significantly higher in EDTA treated group followed by higher ATP production. Moreover, major embryonic genomic activation specific markers/factors were also elevated in EDTA treated group. Conclusively, we elucidated that EDTA showed substantially positive effect to overcome embryo developmental block in canine.
개 parthenote in vitro culture시 EDTA 첨가에 의한 발달율 향상
정해윤,노진구,이휘철,위하연,옥선아,우제석,허태영,임기순,김종국,이승훈,Jeong, Haeyun,Zhao, Minghui,No, Jin-Gu,Ullah, Imran,Lee, Whi-Cheul,Wi, Hayeon,Ock, Sun A,Hur, Tai-young,Woo, Jae-Seok,Im, Gi-sun,Kim, Jong-Gug,Lee, Seunghoon 한국수정란이식학회 2018 한국동물생명공학회지 Vol.33 No.3
Somatic cell nuclear transfer (SCNT) is a useful biotechnological tool for animal cloning. Until now, SCNT has been inefficient, especially in dog. It is believed that an embryo developmental block in SCNT embryos is cause of low production efficiency. However, no studies have been performed on canines for embryo developmental block. In this study, we attempted to evaluate the beneficial role of EDTA in canine parthenogenic (PA) embryos development to overcome embryo developmental block. The PA embryos were divided into 0.01 mM EDTA treated and non-treated groups. Embryo developmental efficiency was measured by activating chemically parthenote. After EDTA induction, PA embryos were evaluated for embryonic development, Reactive Oxygen Species (ROS) activity, mitochondrial integrity, ATP production and genomic activation. The EDTA treated PA embryos showed significantly higher survival rate and improved cavity formation compared to non-treated. Furthermore, cytoplasmic ROS level was mitigated and mitochondrial membrane potential was found significantly higher in EDTA treated group followed by higher ATP production. Moreover, major embryonic genomic activation specific markers/factors were also elevated in EDTA treated group. Conclusively, we elucidated that EDTA showed substantially positive effect to overcome embryo developmental block in canine.