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신용승,김태형,윤종학,노승남,이철구 서울産業大學校 2002 논문집 Vol.53 No.1
The shot peening process is most often used to improve fatigue properties of metal parts. In order to achieve optimum, repeatable and reliable fatigue enhancement from the shot peening process, the important shot peening parameters must be controlled. In this paper, the optimum shot peening condition is investigated. Rotary bending fatigue test was accomplished to investigate the effects of shot peening on the fatigue strength. Experimental results show that the fatigue strength was tremendously increased by optimum peening.
상악동 후비공 용종에서 줄기의 경로에 따른 상악동구 전산화단층촬영 소견
이승훈,박동우,이승로,함창곡,이학수,김용수,박충기 한양대학교 의과대학 2002 한양의대 학술지 Vol.22 No.2
Purpose: We evaluate the pathway of the stalk of antrochoanal polyp on the coronal and axial computed tomography scans (CT), comparing with operative findings. Materials and Methods: Fourteen patients (7∼40 years old, median= 12.5 years old, ratio of male to female: 8/6) with antrochoanal polyp were examined, who took the orbitomeatal unit (OMU) CT including both coronal and axial scans as well as the operation. The CT findings and clinical findings were analyzed for the pathway of the stalk of antrochoanal polyp, comparing with the operative findings. Results: The antrochoanal polyps were mostly located on the left side (12/14, 85.7%) and equally passed through the natural and accessory ostia (7/14, 7/14) in our cases. Those that were passing through the accessory ostium were located more inferiorly and posteriorly, with preserving the natural ostium on CT scans, comparing to those via the natural ostium. However, those passing through the natural ostium had a larger stalk that eroded the uncinate process widely. So each ostium was hardly discriminated on CT scans. Conclusions: The pathway of the stalk of the antrochoanal polyp could be more specifically evaluated on both coronal and axial OMU CT scans. So, it could be more hilpful in the presurgical planning.
Hak-Seung Ro,Kyoung-Gu Lee,June-Seok Lee,Hae-Gwang Jeong,Kyo-Beum Lee 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.1
This paper presents an advanced torque ripple minimization method of a switched reluctance motor (SRM) using torque sharing function (TSF). Generally, TSF is applied into the torque control. However, the conventional TSF cannot follow the expected torque well because of the nonlinear characteristics of the SRM. Moreover, the tail current that is generated at a high speed motor drive makes unexpected torque ripples. The proposed method combined TSF with fuzzy logic control (FLC). The advantage of this method is that the torque can be controlled unity at any conditions. In addition, the controller can track the torque under the condition of the wrong TSF. The effectiveness of the proposed algorithm is verified by the simulations and experiments.
Ro, Hak-Seung,Lee, Kyoung-Gu,Lee, June-Seok,Jeong, Hae-Gwang,Lee, Kyo-Beum The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.1
This paper presents an advanced torque ripple minimization method of a switched reluctance motor (SRM) using torque sharing function (TSF). Generally, TSF is applied into the torque control. However, the conventional TSF cannot follow the expected torque well because of the nonlinear characteristics of the SRM. Moreover, the tail current that is generated at a high speed motor drive makes unexpected torque ripples. The proposed method combined TSF with fuzzy logic control (FLC). The advantage of this method is that the torque can be controlled unity at any conditions. In addition, the controller can track the torque under the condition of the wrong TSF. The effectiveness of the proposed algorithm is verified by the simulations and experiments.