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압전 작동기를 이용한 방향 제어 밸브의 동적 모델링 및 제어
전준철(Juncheol Jeon),한영민(Young-Min Han),구오흥(Quoc Hung Nguyen),한승훈(Seung-Hun Han),최승복(Seung-Bok Choi) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
This paper proposes a new type of high-frequency directional valve controlled by the piezostack actuator associated with displacement amplifier. As a first step, a dynamic model of directional valve which can operate at 200 Hz with a flow rate of 12 l/min is derived by considering pressure drop and flow force. As a second step, an appropriate piezostack is selected by considering actuation force as well as field-dependent displacement. Subsequently, in order to control spool displacement and flow rate a proportional-derivative (PD) controller is designed based on the 3<SUP>rd</SUP>-order valve system. Control performances such as sinusoidal trajectory tracking of the spool displacement in time domain are evaluated. In addition, the field-dependent flow rate is also presented to verify the required performance of the valve system.
압전 작동기를 이용한 방향 제어 밸브의 동적 모델링 및 제어
전준철(Jeon, Jun-Cheol),한영민(Han, Young-Min),구오흥(Nguyen, Quoc Hung),최승복(Choi, Seung-Bok) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.10
This paper proposes a new type of high-frequency directional valve controlled by the piezostack actuator associated with displacement amplifier. As a first step, a dynamic model of directional valve which can operate at 200 Hz with a flow rate of 12 litter/min is derived by considering pressure drop and flow force. As a second step, an appropriate piezostack is selected by considering actuation force as well as field-dependent displacement. Subsequently, in order to control spool displacement and flow rate a proportional-derivative(PD) controller is designed based on the 3rd-order valve system. Control performances such as sinusoidal trajectory tracking of the spool displacement in time domain are evaluated. In addition, the field-dependent flow rate is also presented to verify the required performance of the valve system.
김성혁(Sunghyuk Kim),조남경(Nam-Kyung Cho),한영민(Young-Min Hang) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
연소기연소시험설비에서 후류처리장치는 기본적으로 연소기 연소 화염을 유도하는 역할 뿐만 아니라 소음 및 배기가스를 저감시키는 역할을 한다. 본 논문에서는 한국형발사체(KSLV-II) 개발을 위해 구축된 연소기연소시험설비의 후류처리장치의 전체적인 구성 및 성능시험에 대한 내용을 다루고 있다. 소음 및 배기가스 저감을 위해 적용된 메커니즘과 설비를 보호하기 위한 방법을 제시하였고 후류처리장치의 각 구성품에 대한 공장시험 및 설치 후 성능시험 등에 대해서도 소개하였다. Exhaust system of Combustion Chamber Test Facility(CCTF) have role of noise/emission suppressor as well as that of flame deflector. In this paper, overall design concept and performance test of exhaust system of Combustion Chamber Test Facility for development of KSLV-Ⅱ are presented. Mechanism for noise/emission suppressor and protecting method of the facility are presented. In addition, factory test for each component of exhaust system and performance test after installation are introduced.
혈액투석중인 만성신부전 환자에서 1-alphahydroxycholecalciferol의 사용 경험
송항용,박성광,강성귀,정경호,한영민 의과학연구소 1992 全北醫大論文集 Vol.16 No.3
The purpose of this paper was to assess the clinical effectivenessof 1-alphahydroxycholecalciferol(1-al-of Pha-(OH)-D3), synthetic vitamin D analogue, in a daily oral dose of 1 ug in patients with chronic renal failure on maintenance hemodialysis. We gave the patients either one tablet of 1-alpha-(OH)-D3 a day or palcebo for eight weeks. The response rate of the drug was assessed by the clinical symptoms, la-boratory examination, parathyroid hormone assay, and radiologic examination. They showed moderate increases in serum calcium levels, rduction in serum alkaline phosphatase levels, a decrease in serum immunoreactive parathyroid hormone levels, and no changes in radiologic examination.