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유도전동기 직접토크제어를 위한 새로운 퍼지 가변스위칭 섹터기법
류지수(Ji-Su Ryu),이기상(Kee-Sang Lee),홍순찬(Soon-Chan Hong) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
Direct torque control (DTC) scheme provides a very quick torque response without the complex field-orientation block and inner current regulation loop DTC is known as an appropriate scheme for high power induction motor drives because It can be used at lower switching frequency. There are a major drawbacks with the application of DTC schemes˙ it is large current harmonic due to flux drooping in a low speed range In order to solve the problem, the fuzzy variable switching sector scheme are adopted in this paper A meaningful contribution of this paper is to propose a simple realization scheme of the fuzzy variable switching sector technique. Experimental results show the effectiveness of this proposition.<br/> <br/>
류지수(Ji-Su Ryu),바이사(Bayasgalan),이상호(Sang-Ho Lee) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
In this paper, a sturdy on the controller for super high speed PMSM is described. To drive PMSM at 60000rpm, the MRAS based sensorless control algorithm is applied. The control board was designed using TMS320F28335 and the performance verified by experiments.
고로슬래그 미분말과 플라이애시를 사용한 비소성 시멘트 모르타르의 촉진 탄산화에 따른 압축 강도 특성
류지수 ( Ryu Ji-su ),나형원 ( Na Hyeong-won ),형원길 ( Hyung Won-gil ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In the concrete industry, efforts are being made to reduce CO<sub>2</sub> emissions, and technologies that collect, store, and utilize CO<sub>2</sub> have recently been studied. This study analyzed the change in compressive strength after the accelerated carbonation test of Non-Sintered Cement(NSC) mortar. Type C Fly Ash and Type F Fly Ash were mixed in a 1:1 ratio and then mixed with Blast Furnace Slag fine powder to produce NSC. The mortar produced was cured underwater until the target age. In addition, an accelerated carbonation test was conducted under the condition of a concentration of 5 (±1.0%) of CO<sub>2</sub> gas for 14 days. The mortar compressive strength was measured before and after 14 days of accelerated carbonation test based on the 7th and 28th days of age. As a result of the experiment, the compressive strength was improved in all binder. In general, the compressive strength of NSC mortar subjected to the accelerated carbonation test was similar to that of Ordinary Portland Cement(OPC) mortar not subjected to the accelerated carbonation test.
페로니켈슬래그를 잔골재로 사용한 비소성 시멘트 모르타르의 강도 특성
류지수,장경수,나형원,형원길,Ryu, Ji-Su,Jang, Kyung-Su,Na, Hyeong-Won,Hyung, Won-Gil 한국건축시공학회 2023 한국건축시공학회지 Vol.23 No.4
This experimental study investigates the replacement of conventional Portland cement and sand with non-sintered cement and ferro-nickel slag to formulate eco-friendly cement mortar. The examination aimed to understand the strength properties of non-sintered cement mortar using ferro-nickel slag as fine aggregate by classifying mortar production types, fine aggregates, and curing methodologies. From flexural and compressive strength tests, it was observed that non-sintered cement mortars, incorporating ferro-nickel slag as fine aggregate, exhibited superior strength when compared to both plain mortar and steam-cured non-sintered mortar. This increased strength is attributed to the influence of the particle size, density, and absorption capabilities of the ferro-nickel slag. Furthermore, X-ray Diffraction(XRD) analyses of the mortars verified the presence of MgO, a component of ferro-nickel slag, in the form of a composite oxide. This finding substantiates the consistent strength manifestation of non-sintered cement mortars utilizing ferro-nickel slag as a fine aggregate.