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무진동 크레인의 구현을 위한 여러가지 제어방식의 비교 연구
윤지섭 대한기계학회 1995 대한기계학회논문집 Vol.19 No.9
Crane operation for transporting heavy loads inherently causes swinging motion at the loads due to crane's acceleration or deceleration. This motion not only lowers the handling safety but also slows down the handling process. To complement such a problem, Korea Atomic Energy Research Institute(KAERI) has designed several anti-swing controllers using open loop and closed loop approaches. They are namely a pre-programmed feedback controller and a fuzzy controller. These controllers are implemented on a 1-ton crane system at KAERI and their control performances are compared. Test operations show that the new controllers are superior to that of conventional cranes in terms of robustness to the disturbances and adaptation capability to the change of rope length.
MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>계 유리의 열물성과 내플라즈마성 연구
윤지섭,최재호,정윤성,민경원,임원빈,김형준,Yoon, Ji Sob,Choi, Jae Ho,Jung, YoonSung,Min, Kyung Won,Im, Won Bin,Kim, Hyeong-Jun 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2
In this study, we studied the alternative of plasma resistant ceramic parts that constitute plasma chambers in the semiconductor dry etching process. MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>(MAS) glass was made of 13 types of glass using the Design Of Experiments(DOE) and the effect on thermal properties such as glass transition temperature and crystallization temperature depending on the content of each composition and etching resistance to CF<sub>4</sub>/O<sub>2</sub>/Ar plasma gas. MAS glass showed excellent plasma resistance and surface roughness up to 20 times higher than quartz glass. As the content of Al<sub>2</sub>O<sub>3</sub> and MgO increases, the plasma resistance is improved, and it has been confirmed that it has an inverse relationship with SiO<sub>2</sub>.
갑상선 수술의 해부학적 지표로서의 Zuckerkandl 결절의 중요성
윤지섭,정종주<SUP>1<,SUP>,이용상<SUP>1<,SUP>,남기현<SUP>1<,SUP>,정웅윤<SUP>1<,SUP>,장항석<SUP>1<,SUP>,박정수<SUP>1<,SUP>,Ji-Sup Yun,Jong Ju Jeong,<SUP>1<,SUP>,Yong Sang Lee,<SUP>1<,SUP>,Kee Hyun Nam,<SUP>1<,SUP>,Woong You 대한갑상선-내분비외과학회 2007 The Koreran journal of Endocrine Surgery Vol.7 No.4
Purpose: Zuckerkandl's tubercle (ZT) of the thyroid gland is a well-documented anatomical structure. This study evaluated the anatomical relationship of the ZT in terms of the recurrent laryngeal nerve (RLN) and the superior parathyroid gland (SP). Methods: The study included 325 patients (ten patients with benign tumors and 315 patients with malignancies) who underwent thyroid surgery between February and June 2007. Tubercles were classified according to size: Grade 0 (unrecognizable), Grade I (≤ 5 mm), Grade II (6∼10 mm) and Grade III (>10 mm). The incidence and size of the ZT and its positional relationship to the RLN and SP were investigated during thyroid surgery. Results: ZTs were identified in most patients (right thyroid 89.3%, left thyroid 85.6%). The percentageof tubercles according to grade and location was as follows: Grade 0, right thyroid 10.7% and left thyroid 14.4%; Grade I, right thyroid 7.9% and left thyroid 11.1%; Grade II, right thyroid 43.5% and left thyroid 38.5%; Grade III, right thyroid 37.9% and left thyroid 35.9%. The most common RLN course was in a groove between the ZT and the main body of the thyroid. Most of the SPs are situated cranial to the ZTs and were located at the 1 or 2 o'clock position (96.1%) in the left thyroid and at the 10 or 11 o'clock position (95.2%) in the right thyroid. A greater distance between the ZT and the SP was seen with a decreasing size of the ZT. Conclusion: The ZT was identified during most thyroidectomies, and there was a constant relationship between the ZT and either the RLN or SP. Therefore, identification of the ZT and an understanding of the relationship between the ZT and either the RLN or SP are essential for the performance of safe thyroid surgery. (Korean J Endocrine Surg 2007;7:237-241)
윤지섭 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9
This paper addresses the design procedure and testing result of a servo driven pan/tilt device which is capable of tracking arbitrary movement of a specified target object. In order to achieve real-time acquisition of feedback signal, a 2 degree-of freedom non-contact type displacement follower has been employed in stead of vision camera. The performance of the designed system is tested for different target velocities and control gains. The test result shows the satisfactory performance to be adopted as an effective tool for visual transfer in the context of teleoperation.