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정철수,김용환 대한피부과학회 1971 大韓皮膚科學會誌 Vol.9 No.2
Hidradenitis suppurativa is a rare disease which represents a chronic suppurative and scarring process, affecting the apocrine glands due to persistent bacterial infection and apocrine dysfunction. We have experienced a case of hidradenitis suppurativa, 22-year-old female which involved both axillary region. Diagnosis was established by clinical characteristicsymptoms, histopathological findings and bacteriological examinations.
정철수,이도원,Jung, Cheol-Soo,Lee, Do-Weon 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3
리튬이온 제조공정에서 전해질 주입 후 반드시 거쳐야 하는 숙성공정은 일반적으로 별로 중요하게 다루어 지지 않고 있다. 왜냐하면 전지 숙성공정이 전지성능에 영향을 주는 인자에 대하여 그다지 깊이 있게 연구가 되어있지 않기 때문이다. 하지만 숙성공정 중에 나타나는 OCV 변화는 전해질 내에 포함되어 있는 성분이 전극으로 전기화학적 흡착되어 나타나는 현상으로 SEI 피막 형성에 매우 중요한 역할을 하게 된다. 이에 본 연구에서는 숙성기간 중에 변하게 되는 OCV와 SEI피막의 관계, 그리고 전지성능과의 연계에 대하여 깊이 있게 논의하고자 한다. In the Li ion battery fabrication process, an aging step has treated as a miner step because there is not so much data to define the relationship between the phenomena generated in aging process and the battery performances. However, the OCV(open circuit voltage) change in the aging process is shown by the electrochemical absorption of the electrolyte component to the both electrodes(anode or cathode) and the absorbed layer to the electrode affects to form the solid electrolyte interface(SEI) layer during the first charge process. In this report, the adsorbed materials are designed deliberately and are cleared to affect to the SEI layer formation.
정철수,이용진,김영일,박동원 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0
N/A Separations by hollow fiber modules are fast compared with conventional extraction equipment because of the large surface area per volume. In these modules, the reactants can be contacted at high speed and two flows are completely independent, so there are no problems with loading and channeling. General the mass transfer coefficients in hollow fibers will be maximized when the resistance of the membrane is minimized. This membrane resistance will be minimized if the hollow fiber is wet by the solvent that flow the outside of the fiber. In this paper, for the extraction of Co (II) from wastewater, the extractants were LA-2, EHPNA and TOPO. To determine the rate controlling step in hollow fibers, we examined the effect of inside and outside flow rates of the fibers. From these experiments, we identified for the extraction of system with partition coefficient in hydrophobic hollow fibers, mass transfer in the inside aqueous feed dominated the overall mass transfer.
Tracking Error Constrained Super-twisting Sliding Mode Control for Robotic Systems
정철수,김종식,한성익 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
In this paper, we address a robust super-twisting sliding mode control that ensures finite-time convergence and the prescribed tracking error constrained performance of a robotic system. A tracking error-transformed variable based on a super-twisting sliding mode surface is constructed for achieving the transient and steady-state time performances of the position of the robotic manipulator, and satisfying the properties of an ordinary sliding mode control. The proposed controller performs the constrained positioning of the robot manipulator without using a complex modeling process or intelligent nonlinear approximations for unknown robot dynamics and uncertainty. The problem of difficult separation of an unknown nonlinear function into known and unknown parts in the conventional variable super-twisting algorithm (STA) is overcome by designing a convenient adaptive law for the unknown function. Thus, the proposed control approach provides both finite-time convergence and constrained tracking error boundedness within a prescribed position range of the robotic manipulator. The effectiveness of the proposed robust control scheme is demonstrated through its experimental application to an industrial articulated robot manipulator and a XY robotic manipulator.
정철수,백병진,Masa-aki Kakimoto 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Four kinds of phthalocyanines with 4-fluorophenoxy group (H2Pc, CuPc, Li2Pc, and FePc) are synthesizedby the microwave-assisted method under 15 min. The synthesized phthalocyanines have good solubilityin aprotic polar solvents and do not form any new aggregation state with a concentration increase. Thephthalocyanine coordinated with Li+ ion has a more stable and stronger absorption property in aproticpolar solvents than the phthalocyanine with Cu2+ or Fe2+ ion. The phthalocyanine coordinated with Fe2+ion is more subject to H-aggregation than other phthalocyanines, especially in polar solvents.