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절연 파괴 특성을 이용한 에폭시 복합체의 절연 신뢰도 예측
박건호,이준웅 광운대학교 신기술연구소 1996 신기술연구소논문집 Vol.25 No.-
본 연구에서는 송배전 계통에서 변성기의 몰드 재료로서 널리 사용되고 있는 에폭시 수지를 시료로 하여 설정해 높은 배합비에 따라 5종으로 제작한 각 시편에 대해 절연 파괴 실험을 하였다. 절연파괴 데이터를 가지고 와이블 분포식을 이용하여 임의의 허용 파괴 확률에서의 허용인가 전계의 값을 추정하였으며 절연 안전성을 판단하기 위하여 경년 열화(經年劣化) 데이터의 통계 처리를 행한 결과 허용 파괴 확률을 0.1[%]로 하였을 때, 허용 인가 전계는 21.5[kV/mm] 이하가 되어야 함을 확인할 수 있었다. In this study, the dielectric breakdown of epoxy composites used for transformers was experimented and then its data were simulated by Weibull distribution probability. The more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical, and the breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised, the electric field is concentrated, and the acceleration of electron and the growth of electron avalanche are early accomplished. From the analysis of Weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5[kV/mm].
반조절성교합기와 Axiograph를 이용한 전방시상과로각 차이에 관한 연구
박건호,이성복,백진,최대균,Park, Geon-Ho,Lee, Sung-Bok,Bak, Jin,Choi, Dae-Gyun 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.5
Statement of problem: In the Protar articulator, the models are almost parallel with the Camper's plane. The ultrasonic-based ARCUSdigma system is basis for the determination of dynamic function parameters with so-called "articulator related registration". Purpose: The purpose of this study was to compare the sagittal condylar guidance angles found by use of the wax protrusive records in a semi-adjustable articulator(KaVo Protar 7) with those found by use of the Axiograph (ARCUSdigma). 83 volunteers with intact dentition participated in this study after obtainment of informed consent. Material and method: The sagittal condylar guidance angles were measured and estimated statistically by semi-articulator and Axiograph. All the readings were in degrees. No control was used in this project. To test whether there was a significant difference between the 2 independent samples, paired t-test and Kruskal-Wallis test were carried out(p=.05). Results: 1. The mean results for the wax protrusive records were as follow: right side (32.65 degrees, SD 16.48); left side (33.27 degrees, SD 17.49). 2. The mean results for the Axiograph were as follow: right side (32.26 degrees, SD 7.00); left side (33.07 degrees, SD 7.58). 3. There was no statistical difference on the wax protrusive records and Axiograph(p>0.05). Conclusion: Both methods of wax protrusive records and Axiograph are clinically acceptable for measuring the sagittal condylar guidance angles in semi-adjustable articulators.
新 開墾地 野山土壤의 燐酸施肥 方法 및 施用量이 大豆收量에 미치는 影響
朴建鎬 圓光大學校大學院 1980 學位論叢 Vol.4 No.-
On a newly reclamed soil an experiment was carried out to find out the proper measure of amount of phosphorus fertilizer and application method for improved of yield in Honam area. Results are summarized as follows; 1. The yield was high in whole layer placement of phosphorus fertilizer and low in deep placement in application methods. 2. In the amount of phosphorus fertilizer, broadcasting with 15% of phosphate fixation coefficient, whole layer and deep placement of fertilizer with 10% of phosphate fixation coefficient were maximum yield respectively. 3. In a large quantity of application phosphate, stem diameter of soybean was thicker and blanch and pod number were increase more than the another plot. 4. Application of phosphorus fertilizer 9 ppm of phosphate before experiment become 48 to 123 ppm after and contents of base inclined high. 5. In plant analysis, there was positive correlation between the yield of soybean and the content of phosphate in plant, and a large quantity of phosphate will be absorbed into the plant and utilized it at generative growth after blooming stage.
PVT Variation 보상을 위한 Dynamically Phase Error 추적 기능을 갖춘 저전력 All Digital Delay Locked Loop
박건호,이재진,오성진,이강윤 한국전자파학회 2020 한국전자파학회논문지 Vol.31 No.7
본 논문은 저전력 Replica based all digital delay locked loop(ADDLL)를 제안한다. ADDLL에서 Phase detector(PD)는 위상차이를 감지하고, Accumulator(ACC)는 input clock 대비 output clock이 lead되거나 delay되는 시간을 카운트하여 증가시키거나 감소시킨다. 또한 Analog DLL에서 Charge pump(CP), Loop filter (LF)와 Voltage controlled delay line(VCDL)대신Accumulator(ACC)와 Digitally controlled delay line(DCDL)으로 교체해 Loop filter의 누설 전류를 줄이고, 크기를 줄인다. 본 논문에서는 ADDLL은 Replica DCDL을 이용하여 DLL이 잠긴 이후 temperature나 supply voltage가 변함으로 인해 발생될 수 있는 위상 오차를 감지하는 기술을 설명한다. ACC는 Main DCDL 내부의 delay를 조정하고 350~900 MHz의Operation frequency를 제공한다. 제안하는 ADDLL은 180 nm CMOS 공정으로 설계되었고, 625 MHz에서 Supply voltage 1.8 V를 사용하여 12 mW의 전력소모를 가진다. 레이아웃의 총 크기는 250×300 μm이다.