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서보 모터의 가감속을 고려한 NURBS 곡선의 실시간 직선 보간
이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In this paper, a new parametric curve interpolator is proposed based on a 3D(3-dimensional) NURBS curve. A free curve is generally divided into small linear segments or circular arcs in CNC machining. The method has caused to a command error, the limitation of machining speed, and the irregular machining surface. The proposed real-time 3D NURBS interpolator continuously generates a linear segment within the range of allowable acceleration/deceleration in the motion controller. Therefore, the algorithm calculates the curvature and the remained distance of a command curve for the smoothing machining. It is expected to attaining high speed and high precision machining in CNC Machine Tool.
단상전원하에서의 정지형상변환기에 의한 3상유도전동기의 평형운전
趙哲濟 釜山工業大學 1987 論文集 Vol.29 No.-
Utilization of three-phase induction motor under single-phase power supply causes trouble of unbalanced operation in non-fractional horsepower rating. In this paper, a simple phase converter consisting of a saturable reactor and a capacitor in parallel with an iron-core coil is presented. The converter impedances necessary for a balanced operation of a monocyclic three-phase induction motor is determined from the two sides of a parallelogram whose diagonal is the positive-sequence admittance vector of the motor. It is possible to maintain a satisfactory blalanced operation over a certain range of speed and is considered sufficient to overcome difficulties arising in practical applications.
서보 모터의 가감속을 고려한 2ㆍ3차원 원호의 실시간 직선 보간
이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In CNC machining, a 3D(3-dimension) linear segment and a 2D(2-dimension) circular arc are general forms given by CAD/CAM system. Generally, the 2D circular arc machining is processed using dividing into some linear segments. A 3D circular arc also don't exist in the standard form of NC data. This paper present a algorithm and method for real-time machining of a circular arc(not only the 2D one, but also the 3D one). The 3D circular arc machining is based on the 2D circular arc machining. It only needs making a new coordinate system, converting given 3D points(a start point, a end point, and a center point of a 3D circular arc) into points of the new coordinate system, and processing a inverse transformation about a interpolated point. The proposed algorithm was implemented and simulated on PC system. It was confirmed to give a good result.
염철민,최유식,변석종,조순행,윤제용 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2
This study was conducted to investigate the haloacetic acid (HAAs) formation characteristics in raw and treated water in Korea. The raw and treated water from the five major rivers were examined to measure the HAAs concentrations and compared those with literature values. Major findings are as follows. First, average HAAs concentration of treated water (collected from three water treatment plants) in Korea appeared to be 62.5±66.7㎍/L (n=7) and this level is higher than the average trihalomethanes (THMs) concentration (13.2±12.9㎍/L, n=6933) reported recently. Second, the average formation potential of TCAA and DCAA after three days was found as 103±74㎍/L (n=14) and 76±36㎍/L (n=14), respectively. As this result was applied to US-EPA developed model equation for TCAA and DCAA formation, dissolved organic matter (DOM) in Korea has a tendency to produce more TCAA and DCAA as compared to US. This phenomenon was especially notable in DCAA. The sum of weight percentage of TCAA and DCAA which are individual component of HAAS was composed of 80% of HAAs.
조철제 釜山工業大學校 1992 論文集 Vol.34 No.-
As the ac servo systems are of recent development and their advantages have not been published in detail, it is very difficult for the user and application engineer to choose and appropriate type of serbo drive from the ac servo group for a particular application. In the view of power density and acceleration characteristics of the servo drive, ac servo are being recognized superior to those of the existing dc counterpart. Thus, this study is intended to develop a set of selection criteria to distinguisg the various servo drives of the ac servo group. The considered factors are cost, power density, acceleration charateristics, torque per unit ampere, peak torque capability, rotor postion detector, etc.
류제라,서만철 공주대학교 문화재보존과학연구소 2003 문화재과학기술 Vol.2 No.1
함안 방어산 마애여래입상의 보존처리는 마애불 전면 세척 후 균열이 심한 절리면에 충진 접착과 발수경화 처리로 이루어졌다. 세척은 불상군 위쪽에서 빗물에 의해 흘러내린 흙물 자국과 먼지 등을 압축 공기 세척기를 이용하여 일차적으로 이루어졌으며, 고온스팀 세척기는 이끼류처럼 석재표면에 깊이 뿌리를 내리고 부착생활을 하는 생물을 제거하였다. 석재표면 세척 약품인 ARTE MUNDIT No.Ⅰ의 사용은 생물학적 오염이 심한 부분에서 오염 물질 제거에 효과적이었다. 오염물질을 제거 한 결과 마애여래입상은 음각선이 아주 선명하게 드러났으며 전체적으로 암석의 색이 드러남을 확인할 수 있었다. 마애불의 균열이 심한 절리면에는 암석용 충진접합제(에폭시수시L-40)를 사용하였다. 경화제로는 Wacker OH-100을 사용하여 석재표면에 외부의 수분을 석재내부로 침투되지 않도록 하는 동시에 지반으로부터 석재 내부로 유입된 수분이 석재표면 쪽으로 잘 상승할 수 있는 발수층을 형성하였다. Conservation treatment of Buddha carved on rock surface at Bangeosan has been processed by three procedure; cleansing on whole surface of Buddha, adhesion with epoxy resins to cracks, and applying waterproof-hardener to the surface. Cleansing procedure was processed both a sprayer by compressed air and a steam blower. Subsequently, mottle, dust, and moss on the surface were effectively eliminated. ARTE MUNDIT No. 1, one of washing chemical component, showed good result for the cleansing of a became contaminated part by biological polluters. As the result of the cleansing, the intaglio lines of Buddha became sharpened and the original color of rock was recovered. L-40, adhesive filler for rock, was used on crack surface. Application of Wacker OH-100 as a waterproof-hardener, formed waterproof film on the surface of rock.