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공작기계의 선형경로에 대한 오차모델을 이용한 제어기 설계
길형균,이건복 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
The work presented here deals with controller desgn using error model constructed with proportional control ramp response. The design aims at the improvement of transient response, steady-state error reduction with stability presrvation, generation of the consistent contour error through the proportional gain regulation of a mismatched system. The first step is to generate tracking-error curve with proportional control only and decide the added error signal shape on the error curve. The next is to construct a table for the steady-state loop gain with step input. The table is used for selecting the proportional gain. The effectiveness of the proposed controller is confirmed through the simulation and experiment.
A Modified Space-Vector PWM Inverter without Phase Current Sensors
Hyeong-Gil Joo,Hwi-Beom Shin,In-Hwan Oh,Myung-Joong Youn 한국정보과학회 1997 Journal of Electrical Engineering and Information Vol.2 No.4
A method of detecting the three phase currents for a voltage-fed pulse width modulated(PWM) inverter is proposed, where only one current sensor is utilized on the dc-link. The proposed method has the constant sampling time by employing the modified space-vector PWM technique which generates the rearranged switching pattern to detect a phase current from a dc-link current. Experimental results show that the proposed scheme provides a very good detection method of three phase currents without phase current sensors. This method is very simple and has small detection errors.
정전압 변압기의 회로정수에 따른 특성 변화에 관한 연구
주형길(Hyeong-Gil Joo),한재원(Jae-Won Han) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The constant voltage transformer(CVT) is a voltage regulator that has a high reliability, a good short circuit characteristic, a high input power factor, and a relative immunity to lightning strike. Moreover, this has a good line regulation without a voltage feedback control. In this paper, the characteristics of CVT for the changes of input voltage and other circuit parameters are investigated.
전형길(Hyeong Gil Jeon),이인혜(In Hye Lee) 한국어학회 2013 한국어학 Vol.61 No.-
This study investigates aspects of revision in advanced KFL learners’ writing. For this study, 18Chinese KFL students and 5 Korean students wrote a composition in Korean on the subject ‘Conditions for Success’. After assessment, each of the 23 compositions were divided into 3 groups, named less-skilled L2 group(C1), skilled L2 group(C2) and Korean L1 group(K). Each group revisions were coded to indicate whether they occurred during Stage 1, Stage 2, or Stage 3 of the writing process and were also analysed as immediate/distant changes, surface/text-based changes, phrase/clause changes, and additions/deletions/substitutions. Through the examination of the revisions showed that less-skilled L2 group revised the most, however, majority of revision of C1 were only surface revisions. Moreover, it showed that unskilled L2group revised uneffectively. Results also suggest that, whereas skilled L2 group`s revision tendency is somewhere in between C1 and K but in more similar ways to K,less-skilled L2 group revised in different ways to group K and C2. Skilled L2 group tended to revise after the completion of the draft due to the fact that they recognized their limitation as a KFL writers and also they did not put much efforts in the lexical and grammatical selection during the transforming stage, whereas less-skilled L2group revised considerably during planning and transforming stages. Again, this study represents how advanced KFL learners revise their compositions and shows implications for writing education.
도시철도 전력설비 이상검출용 장치 공장시험에 대한 고찰
임형길(Hyeong-Gil Im),유기선(Ki-Seon Ryu),정호성(Ho-Sung Jung),최광범(Kwang-Bum Choi),이기승(Gi-Seung Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Because of the environmental matters the importance of the city railroad is as time goes by increasing. The case of obstacle of the power equipment which supplies electric power to city railroad will occur social and economical enormous loss. Thus, I studied on the preventing method in advance which makes it possible for us to maintain facilities efficiently. The main check points of the power facilities are voltage, current, humidity, partial discharge, move current. These points are gathered by sensor and transmitting to data acquisition device. These data are used to check equipment status in real time. In this paper I described in brief test process and results of the detection system.