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Secondary Ride 해석을 위한 노면 생성 프로그램 개발
권형주(Hyungju Kwon),계경태(Kyungtae Kye),김영준(Youngjun Kim),박순조(Soonjo Park),장지현(Jihyun Chang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For the exact ride analysis, it is important that a road information should be modeled more precisely. There are two ways of studies in modeling road. One is the experimental method, measuring the road height and displaying the road information in the PSD level as is proposed by ISO, MIRA and Wong. The other method is to generate the road information based on the random signal and to analyze the dynamic response of the simple vehicle model driven through the uneven road. Considering that there is a certain relation between the roads that left wheel and right wheel are passing on, it is clear that the road for full vehicle simulation is essential. Therefore we intend to develop the RPG(Road Profile Generator) program in this research, which is used for generating the road profile according to the rule of ISO, MIRA and Wong standard. We can analyze the secondary ride characteristics of the vehicle more precisely through the full vehicle simulation using this ADAMS road file produced by the RPG, which is the basic study of secondary ride analysis.
MDPS 토션바 강성 증대에 따른 시스템 영향성 분석 및 성능 향상
김동희(Donghee Kim),권형주(Hyungju Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
This paper describes the effect of the system on the torsion bar stiffness of the Electric Power Steering. The MDPS system mainly functions to assist the driver"s torque in the vehicle. Its components can be roughly classified into torsion bar, torque sensor, motor sensor, ECU, and motor. When the driver steers, the torsion bar is twisted and the torque sensor measures the torsion angle of the torsion bar. Therefore the motor is finally driven according to the steering torque magnitude of the driver. Recently, the stiffness of the torsion bar has been increased to improve the response of the MDPS. In this paper, the system frequency response was measured and analyzed to determine the influence of the system on the stiffness increase of the torsion bar. In conclusion, this study was designed to increase the sampling frequency in order to increase the system phase and analyze the gain-phase of the logic to verify its effect.
송광섭(Kwang-Seop Song),채영준(Young Jun Chai),백세현(Se Hyun Paek),권형주(Hyungju Kwon),김수진(Su-jin Kim),최준영(June Young Choi),구도훈(Do Hoon Koo),이규언(Kyu Eun Lee),윤여규(Yeo-Kyu Youn) 대한종양외과학회 2013 Korean Journal of Clinical Oncology Vol.9 No.2
Purpose: Laparoscopic adrenalectomy has been a standard method for adrenal gland tumors. On the other hand, hand-assisted laparoscopic adrenalectomy is an operative method which enables operator to use a hand to facilitate dissection and retraction. The aim of this study was to report initial experience of hand-assisted laparoscopic adrenalectomy and to evaluate potentialities for surgical application. Methods: Seven patients who underwent hand-assisted adrenalectomy from September 2010 to July 2013 were enrolled. Clinicopathological characteristics, intraoperative hemodynamic status, and parameters associated with postoperative recovery were reviewed. Surgical indications for hand-assisted laparoscopic adrenalectomy were right side adrenal tumors larger than 4 cm on preoperative computed tomography (CT) scan. Mean age was 36.9 years (range, 23 to 51 years) and there were 3 men and 4 women. Results: The mean size of adrenal tumor was 6.1±2.4 cm. Operation time was 119.4±29.7 minutes in average and mean blood loss was 142.9±109.7 mL. There were 4 patients with pheochromocytoma, one patient for each adrenocortical neoplasm, paraganglioma and lymphoma. Intraoperative hypertensive crisis were observed in 2 patients with pheochromocytoma and there was no intraoperative tachycardia crisis. Patients had first oral intake at 1.4±0.8 days in average and mean postoperative hospital stay was 3.4±1.3 days. There was no postoperative complication and mortality. The median follow-up was 12 months and there was no case with evidence of recurrence during the periods. Conclusion: In our initial experience, hand-assisted laparoscopic adrenalectomy was performed safely and effectively. Hand-assisted laparoscopic adrenalectomy might be an alternative to laparoscopic adrenalectomy for moderate sized right side adrenal tumors.