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지봉철,전정채,박왈서 원광대학교 공업기술개발연구소 1999 工業技術開發硏究誌 Vol.19 No.-
Robust control is needed according to the highest precision of industrial automation, However, when a control system with PID controller has an effect of load disturbance, it is very difficult to guarantee the robustness of control system. As a method solving this problem, in this paper, Feedfoward supervisory control method for PID control system is presented. the effectiveness of the control scheme is verified by simulation results.
전문가 슬라이딩 모드 제어기를 이용한 직류전동기의 강인한 속도제어
지봉철,박왈서 한국조명전기설비학회 2000 조명·전기설비학회논문지 Vol.14 No.1
산업자동화의 고정밀도에 따라 직류 전동기는 강인제어가 요구되고 있다. 하지만 전동기 제어 시스템이 부하외 란의 영향을 받게 되면 강인제어는 어렵게 된다. 일반적으로 슬라이딩 모드 제어기는 강인성을 갖는 것으로 알려져 있다. 강인한 슬라이딩 모드제어기는 외란의 불확실한 정도를 알고 있다는 가정하에 설계된다. 그러므로 외란의 불확실 정도를 알지 못한다면 제어기의 설계는 어렵게 된다. 이를 해결하기 위한 방법으로 본 논문에서는 전동기 제어 시스템을 위한 전문가 슬라이딩 모 드 제어 기법을 제시하였다. 제의된 제어기는 부하 외란을 효과적으로 제거 할 수 있었다. 제어기법의 효과는 시 율레이션에 의해 확인하였다. Robust control for DC motor is needed according to the highest precision of industrial automation. However, when a motor control system has an effect of load disturbance, it is very difficult to guarantee the robustness of control system. Generally, it is known that sliding mode controller has robustness. But, after it is assumed that we known the disturbance uncertainty, sliding mode controller is designed. Thereafter, if we are not known th disturbance uncertainty then controller design is difficult. As a method solving this problem, in this paper, Expert sliding mode control method for motor control system is presented.The proposed controller can eliminate load disturbance effectively. The effectiveness of the control scheme is verified by simulation results.
Cs^+ 치환에 따른 수전해용 공유가교 SPEEK/HPA 복합막의 안정화
지봉철,하성인,송민아,정장훈,문상봉,강안수 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.1
To improve the mechanical properties, such as durabilities and antioxidative characteristics, the covalently cross-linked (CL-) SPEEK (sulfonated polyether ether ketone)/Cs-substituted HPA (heteropoly acid)organic-inorganic composite membranes (CL-SPEEK/Cs-HPAs), have been intensively investigated. The composite membrane were prepared by blending cesium-substituted HPAs (Cs-HPAs), including tungstophosphoric acid (TPA),molybdophosphoric acid (MoPA), and tungstosilicic acid (TSiA) with cross-linking agent content of 0.01 mL. And composite electrolytes composed of Cs-HPAs, prepared by immersion (imm.) and titration (titr.) methods to increase the stability of HPAs in water, were applied to polymer electrolyte membrane electrolysis (PEME). As a result,the proton conductivity of Cs-substituted composite membranes increased rapidly over 60℃ but mechanical properties, such as tensile strength, decreased in accordance with added Cs content. The bleeding-out of Cs-TPA membranes by titration method (50 vol.% Cs) decreased steadily to 2.15%. In the oxidative stability test by Fenton solution , the durability of membranes with Cs-HPA significantly increased. In case of CL-SPEEK/ Cs-TPA membrane, duration time increased more than 1200 hours. It is expected that even though CL-SPEEK/Cs-MoPA membrane shows the high proton conductivity, electrocatalytic activity and cell voltage of 1.80 V for water electrolysis, the CL-SPEEK/Cs-TPA (imm.) is more suitable as an alternative membrane in real system with the satisfactory proton conductivity, mechanical properties, anti-oxidative stability and cell voltage of 1.89 V.
신경망 슬라이딩 모드 제어기를 이용한 비선형 시스템의 강인 제어
박민규,지봉철,박왈서 원광대학교 공업기술개발연구소 1998 工業技術開發硏究誌 Vol.18 No.-
In this paper, in order to minimize the effect of system uncertainty and reduce chattering that sliding mode control has, neural network sliding mode control method mixing sliding mode control and neural network is presented. Generally, sliding mode control is well known as robust control method to handle uncertainty caused by modeling error of nonlinear system and disturbance. These robustness is because of the discontinuous term of control input. But this leads to chattering, the most serious problem of sliding mode control. As method to reduce this chattering, neural network sliding mode control that proper continuous output values on the each values(error and error change rate) in boundary layer of sliding surface are determined by neural network is presented. The proposed controller is compared with general sliding mode control and sliding nude control having boundary layer by simulating in first order system and second system in order to confirm its capability, The proposed controller showed the sma13est chattering and can reduce tracking error in the result of comparison.
전극 촉매 Pt-Ni 및 Pt-Co를 이용한 수전해용 공유가교 CL-SPEEK/HPA 막전극의 특성
우제영,이광문,지봉철,정장훈,문상봉,강안수 한국수소및신에너지학회 2010 한국수소 및 신에너지학회논문집 Vol.21 No.1
The electrocatalystic prperties of Pt-Co and Pt-Ni with heteropolyacids (HPAs) entrapped in covalently cross-linked sulfonated poly(ether ether ketone) (CL-SPEEK)/HPA membranes were investigated for water electrolysis. The HPAs, including molybdophosphoric acid (MoPA), and tungstophosphoric acid (TPA) were both used as membrane additives and electrocatalysts. The membrane electrode assembly (MEA) was prepared by a nonequilibrium impregnation-reduction (I-R) method. Pt(NH3)4Cl2, NiCl2 and CoCl2 as electrocatalytic materials and NaBH4 as reducing agent were used. I order to enhance electrocatalytic activity, the catalyst layer prepared above was electrodeposited (Dep) with HPA. Surface morphologies and physico-chemical properties of MEA were investigated by means of SEM, EDX and XRD. The electrocatalytic properties of composite membranes such as the cell voltage and coulombic charge in CV were in the order of magnitude: CL-SPEEK/ MoPA40 (wt%) > CL-SPEEK/TPA30 > Nafion117. In the optimum cell applications for water electrolysis, the cell voltage of Pt/CL-SPEEK-MoPA40/Pt-Co (Dep-MoPA) and Pt/CL-SPEEK-TPA30/Pt-Co (Dep-TPA) was 1.75 V at 80℃ and 1 A/cm2 and voltage efficiency was 87.1%. Also, the observed activity of Pt-Co (84:16 atomic ratio by EDX) is a little higher than that of Pt-Ni (86:14). The current density peak of electrodeposited electrodes were better a little than those of unactivated electrodes based on the same membranes.
전원모듈 소형화를 위한 Planar Inductor/Transformer 설계에 관한 연구
안대진(Dae-Jin Ahn),지봉철(Bong-Chul Ji),장호산(Ho-San Jang),신유용(You-Yong Shin) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.11
Due to the emergence of smart devices and wearable devices due to the influence of the 4th Industrial Revolution, the demand for technologies such as high performance, high efficiency, and small/light weight of SMPS is increasing. However, due to the limitations of energy accumulation and conversion elements such as transformer, capacitor, and inductor, it is difficult to make it smaller/lighter. This paper deals with a study on how to design a high-efficiency and high-density power conversion system using Planar Inductor/Transformer, which can be applied to small power conversion modules. Planar Inductor/Transformer features a flat plane design and high-density winding, which improves space efficiency and power conversion efficiency. The text analyzes the requirements of the proposed power conversion module, introduces technical aspects and features of Planar magnetics, and presents design guidelines. In addition, it explains in detail how to design and manufacture high efficiency by applying Planar Inductor/Transformer.