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권병휘,이성일,홍진웅,이준웅,이원재 한국고무학회 1987 엘라스토머 및 콤포지트 Vol.22 No.1
The characteristic of the dielectric relaxation in silicone rubbers were studied in the frequency range of 1×10²∼3×10^6 ㎐ at the temperature range of 30℃∼170℃. As the results of the study, it has been confirmed that the silicone rubber containing the cross-linking agents of 2,5-bis(tert-butylperoxy)-2,5-dimethyl hexane exhibit the dissipation spectra of two kind(α, β dissipation) due to the siloxane and methyl groups. Particularly, the maximum value of dielectric loss spectra of silicone rubber combinning the cross-linking agents of 0.7phr to 1.0phr are on the increasing in high frequency region, but the specimen of above 1.0phr become smaller again The energy and the entropy of activation on the molicular motion obtained 18.32㎉/mole and 1.48㎈/mole·deg in measuring condition respectively.
저밀도 폴리에틸렌의 유전손실과 내부마찰 손실의 주파수 변화에 따른 상응성 연구
權炳徽 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
It is investigated the corresponding similarities of characteristics between the dielectric and internal friction losses dependent of frequency of low density polyethylene. The internal friction losses measured by ke^type torsion pendulum as well as the forces oscillation method show a loss peak, say α. Considering those facts, it is concluded that the mechanical α peak should be originated from crystalline region. The dependent on frequency of dielectric losses investigated at around room temperature, it is observed that dielectric loss peak. say a due to interface polarization occurs about 330[Hz] and that, at about 3[MHz] appears an imperfect trace of the peak due to orientational polarization, with which the a loss peak in internal friction may be in correspondence concerning the quenching effects to dielectric characteristics. As conclusion the comparative discussions can be possibly processed on thesimilarities for the observed characteristics.
절연용 저밀도 폴리에틸렌의 인장에 따른 기계적 내부마찰손실과 유전손실에 관한연구
權炳徽 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-
In order to investigate a the corresponding simillarities of charac-teristics between the dielectric and internal friction losses for low density polyethylene, several observations were carried out on the specimens such as the received prepared by elongation as well as thermal quenching process. As conclusion the comparative discussions can be possibly processed on the similarities for the observed characteristics between dynamic mechanical and dielectric relaxations as mentioned above.
권병휘,全光鎬,崔秉淑,鄭雨均 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
In this dissertation a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error its rate of change, and the drive current as three fuzzy variables. The real command output current is chosen by the defuzzification of fuzzy output extracted from the fuzzy control rules. The flex and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics The performance of this control system is substantiated by computer simulations.
權炳徽 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-
To Study on the electrical characteristics due to the sodium chloride additive in transformer oils for insulating and cooling of transformer, the characteristics of AC breakdown have been investigated. The specimens are classified by content of a pure sodium chloride, 3[ppm] 6[ppm] and 9[ppm], respectively. In case of the AC breakdown test, the temperature are 30[℃], 50[℃], 80[℃] and 90[℃] respectively. In breakdown experiment, it is comfirmed that the dielectric breakdown voltage is decrease in low temperature region and is increase in high temperature region according to the increase of contained sodium chloride.
고조파 분석과 고조파 억제 시스템의 엑티브 필터에 관한 연구
권병휘,강태은,원진희,조용상,조의상,김진성 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-
The paper considers the theoretical problem of eliminating harmonics in inverter waveforms. The problems associated with the harmonics distortion of PWM inverter devices were analysed. Voltage control methods are variable parameter each harmonics magnitude improve the voltage wareform.
Pattern Search 법을 이용한 최적화 접지 설계에 관한 연구
權炳徽,최병숙,신강욱,조경남,조의상 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-
Electric power facilities must have effective grounding to provide means to carry electric current into the earth under fault conditions and to prevent damage of equipment, ignition, and electrocution of presonnel. This paper present an algorithm called the pattern search method for the optimal parameters selection of the grounding system. Computer simulation results used the CDEGS grounding analysis program verifying the effects of the grounding system design parameters obtained from this method show that the grounding systems are adequately designed.
權炳徽 홍익대학교 산업기술연구소 1993 産業技術 Vol.2 No.-
artial derivatives are easily computed analytically assuming that all the geometric information is known. However, there are computational difficulties in getting accurate partial derivatives directly from a range image since an image is a discrete version of continuous data contaminated with some noise. In this paper, we develop a general window function to compute partial derivatives based on the least square surface fitting method. A dynamic selective surface fitting method is introduced to make the window less sensitive to noise. Any degree of partial derivative can be obtained by a simple convolution between an image and window functions.
케이블용 LDPE에 있어서 유전손실의 온도 의존성에 관한 연구
權炳徽 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-
We studied the temperature dependence of Dielectric loss in original specimen and ice quenched specimen after thermal treatment for L.D.P.E. For the frequency dependent characteristics of dielectric relaxation investigated at around room temperature. it is observed that dielectric loss peak say a due to interface polarization occurs about 330[㎐] and that at about 3[M㎐] appears an imperfect trace of the peak due to orientational polarization with which the a loss peak in internal friction may be in correspondence concerning the quenching effects to dielectric characteristics, the severs quenching conditions is much decreasing magnit-ude of a peak is observed. For this reason, it is attributed for the interface area between amorphous and crystalline regions at which the interfacial polarization takes place may decrease at the expense of destroyed crystall region, because of severe quenching conditons.
Pattern Search를 이용한 축구전용 경기장의 최적의 조명기구 위치 산정
權炳徽,崔棅淑,徐梵寬 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-
One essential contribution to a successful soccer game, which is still not always recognised as such, is the standard and quality of the lighting system. This is not only for TV transmissions, but also for the general practising of the sports. But, on too many occasions, sport activities and events have been allocated with insufficient or Inappropriate lighting system. inadequate lighting spoils not only the pleasure and the interests of active sportsmen, but also the comfort of the spectators in both the stadium and at home watching their TV. So this paper newly proposes the algorithm for searching of luminaire position which can be applied to the design stage.