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안두수,임윤식,김민형,이재춘,이한석 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1
In this paper, a simple method is developed for desiging a single loop PID contriller using a computer oriented algebraic approach which is based on general polynomial. Specifically, the proposed PID controller can approximately achieve an arbitrarily specified closed-loop response, which satisfies time domain specifications such as rising time, overshoot and settling time. The design technique is straightforward, and the paramaters of the PID controller are determined by solving a set of linear equations using the least squares method. It does not involve any trial and error proceduer, hence the difficulty of the conventional approach can be avoided.
GIS내 파티클 상태에 따른 방전패턴 및 초음파 신호 특성 연구
이곤(Kon Lee),이동준(Dong-Zoon Lee),이재걸(Jae Gul Lee),류성식(Sung Sic Ryu),신동석(Dong Suk Shin),곽희로(Hee Ro Kwak) 한국조명·전기설비학회 1999 한국조명·전기설비학회 학술대회논문집 Vol.1999 No.-
This paper describes the characteristics of PD patterns and acoustic signal for the possible four states of particles in GIS. For each case of defect, the PD patterns and acoustic signals were measured and analyzed. As a result, the characteristics of the discharge patterns and ultrasonic signals depending for each defect state could be distinguished. Using the discharge patterns and ultrasonic signal waves, the defects in the GIS and the states of the particles can be distinguished.
Jae-Won Song,Joong-Ki Lim,Kee-Joon Lee,Sang-Jin Sung,Youn-Sic Chun,Sung-Seo Mo 대한치과교정학회 2016 대한치과교정학회지 Vol.46 No.4
Objective: Orthodontic mini-implants (OMI) generate various horizontal and vertical force vectors and moments according to their insertion positions. This study aimed to help select ideal biomechanics during maxillary incisor retraction by varying the length in the anterior retraction hook (ARH) and OMI position. Methods: Two extraction models were constructed to analyze the threedimentional finite element: a first premolar extraction model (Model 1, M1) and a residual 1-mm space post-extraction model (Model 2, M2). The OMI position was set at a height of 8 mm from the arch wire between the second maxillary premolar and the first molar (low OMI traction) or at a 12-mm height in the mesial second maxillary premolar (high OMI traction). Retraction force vectors of 200 g from the ARH (−1, +1, +3, and +6 mm) at low or high OMI traction were resolved into X-, Y-, and Z-axis components. Results: In M1 (low and high OMI traction) and M2 (low OMI traction), the maxillary incisor tip was extruded, but the apex was intruded, and the occlusal plane was rotated clockwise. Significant intrusion and counter-clockwise rotation in the occlusal plane were observed under high OMI traction and −1 mm ARH in M2. Conclusions: This study observed orthodontic tooth movement according to the OMI position and ARH height, and M2 under high OMI traction with short ARH showed retraction with maxillary incisor intrusion.
OVERVIEW OF SUPERCONDUCTING MAGNET POWER SUPPLY SYSTEM FOR THE KSTAR 1ST PLASMA EXPERIMENT
JAE HOON CHOI,HYUNG LYEOL YANG,HYUN SIK AHN,GYEYONG JANG,DONG KEUN LEE,KUK HEE KIM,SANG HEE HAHN,CHANG HWAN KIM,JAE SIC HONG,YONG CHU,JONG DAE KONG,SEONG LOK HONG,IN SUNG HWANG,MIN SEONG YUN,DAE KYUNG 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.6
The KSTAR Magnet Power Supply (MPS) was dedicated to the SC coil commissioning and 1st plasma experiment as a part of the system commissioning. Although many efforts to develop large-current power supplies that are useful for high power electronic devices have been made in various application fields, such as for large metal-plating devices, there were clear discrepancies between conventional power supply technologies and that for the SC coils due to the special SC coil load conditions. Therefore, most of the power supply technologies for the SC coils were a challenge in the domestic research area due to their limited application. However, the MPS commissioning result showed that all of the hardware and controlling software operated well, and this result finally led to the success of SC coil commissioning and the KSTAR 1st plasma experiment. This paper will describe key features of KSTAR MPS for the 1st plasma experiment, and will also report the commissioning results of the magnet power supplies.