• 제목/요약/키워드: 이영춘

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Design of Optimal Idle Speed Controller by Sliding Mode Observer (슬라이딩 모드 관측기에 의한 최적의 공회전 제어기 설계)

  • Lee, Young-Choon;Lee, Seong-Cheol
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.10
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    • pp.161-167
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    • 2001
  • This paper presents an approach to nonlinear engine idle controller and intake manifold absolute pressure(MAP) observer based on mean torque production model. A stable engine idle speed is important in that the unstable engine Idle mode can make engine to drooping or stall state. A sliding fuzzy controller has been designed to control engine idle speed under load disturbance. A sliding observer is also developed to estimate the intake manifold absolute pressure and compared with the actual MAP sensor value. The sliding mode observer has shown good robustness and good tracking performance. The inputs of sliding fuzzy controller are the errors of rpm and MAP. The output is a duty cycle(DC) for driving a idle speed control valve(ISCV).

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Design of Stable Controller to Sudden A/C Disturbance (급격한 에어콘 외란에 안정한 제어기 설계)

  • 이영춘;권대규;이성철
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.106-112
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    • 2000
  • The purpose of this paper is to study on the control of the engine idle speed under sudden A/C load which is one of the most severe disturbances on engines. Three types of the closed-loop controller are developed for the stable engine idle speed control. The input of the controller is an error of rpm. The output of the controller is an ISCV duty cycle. The anticipation delay is considered to deal with the delay time of the air mass in engine. The PID, Fuzzy and PID-type Fuzzy controllers with the anticipation delay have improved the engine idle speed condition more than current ECU map table under the A/C load.

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패턴 매칭법에 의한 키보드 라벨 검사 시스템

  • 이병호;이영춘;이성철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.05a
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    • pp.283-283
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    • 2004
  • 공장자동화는 국제사회 속에서 살아 남기 위한 필수 요건이 되었다. 값싼 인건비를 무기로 제품 경쟁에 뛰어 들고 있는 주변국가와 경쟁하기 위해서는 인건비 절감과 품질 향상이 필수적이다. 본 논문은 POS용 키보드의 생산공정 중에서 조립된 키보드 칼라 라벨을 자동 검사하는 시스템 개발을 최종목표로 하였다. 현재, 산업용으로 폭 넓게 사용되고 있는 머신 비전 측정시스템은 흑백의 영상과 비교적 간단한 물체에 초점을 맞추고 있다. 그러나, Fig.1의 POS용 키보드는 일반 컴퓨터용 키보드와는 달리 각각의 키가 칼라 라벨로 되어있기 때문에 기존의 흑백 머신 비전 시스템으로 자동화를 구축하기는 힘들다.(중략)

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Studies on the Optical Resolution of DL-Amino Acids by Aminoacylase Immobilized on Chitosan: Immobilization of Aminoacylase (Chitosan 고정화 Aminoacylase를 이용한 DL-아미노산의 광학적 분할에 관한 연구 : Aminoacylase 의 고정화)

  • Lee, Sang-Hyun;Lee, Young-Chun
    • Korean Journal of Food Science and Technology
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    • v.20 no.4
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    • pp.541-546
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    • 1988
  • Optimum conditions for immobilization of aminoacylase on chitosan were investigated, and the results are summerized as follows: Optimum conditions for activation of chitosan were pH 6.0, 0.2% of glutaraldehyde, and 120 minutes of reaction time. Enzyme concentration and reaction time for immobilization of aminoacylase on the activated chitosan were 80mg/20ml, and 90 minutes, respectively, and the yield of activity of the immobilized enzyme was 42.6%.

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A Study on Development of Test Methodology and Test of No Spin Differential for Off-road Vehicle (야지 차량용 No Spin Differential의 평가방안 개발 및 시험평가에 관한 연구)

  • Pyoun Youngshik;Jang Youngdo;Park Jeonghyeon;Cho Inho;Lee Youngchun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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    • pp.32-38
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    • 2005
  • Two No Spin Differential(NSD) models were benchmarked for a project of Dual-Use Technology The Axiomatic approach was utilized to evaluate two models and to derive an evolutionary design from the evaluated results. Test methodology is developed and used to evaluate the mobility, steerability, durability and noise of the newly developed sample. The test results of NSD sample on the test methodology are very positive regarding functional performances.

Preparation and Quality Properties of the Jam Aroma- recovered (향기성분이 회수.첨가된 잼의 제조와 품질특성)

  • 이상현;이영춘
    • The Korean Journal of Food And Nutrition
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    • v.6 no.4
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    • pp.281-286
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    • 1993
  • Strawberry pulp was separated into serum and Insoluble pulp by centrifugation. The serum was concentrated in vacuo at 55~58$^{\circ}C$ and 10% aroma recovered. Two folds concentrated strawberry pulp was prepared by mixing concentrated serum, aroma fraction and Insoluble pulp. To develop aroma-rich jam, the strawberry jam was prepared by filling mixture of concentrated pulp, sucrose, citric acid and pectin into retortable pouches and by heating them after heat-seating. The color and flavor quality of the jam prepared by new method were better than the jam prepared by conventional method, as Indicated by GC, GC/MS data, surface color and anthocyanin contents. These results were confirmed by the sensory evaluations. Flavor off-flavor, color intensity and overall acceptance were superior to the conventional method.

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Characteristics of the Contact Angle Using the Microwave Plasma Treatment on Scintillator Panel Substrates (마이크로웨이브 플라즈마 처리를 통한 섬광체 패널 기판의 접촉가 특성변화)

  • Kim, Byoungwook;Kim, Youngju;Ryu, Cheolwoo;Choi, Byoungjung;Kwon, Youngman;Lee, Youngchoon;Kim, Myungsoo;Cho, Gyuseong
    • Journal of Radiation Industry
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    • v.8 no.1
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    • pp.43-47
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    • 2014
  • By measuring decrease change of the contact angle after microwave plasma treatment on the glass and Al as a scintillator panel sample substrate, the adhesive performance of scintillator panel can be expected to improve. Also resolution and sensitivity of scintillator panel after microwave plasma treatment can be expected to maintain highly.

Development of the Transfer Case for Power Distribution (동력분배용 중간변속기 개발에 관한 연구)

  • Sim, Ki-Joong;Moon, Hong-Ju;Lee, Youngchoon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.2
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    • pp.95-102
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    • 2018
  • This paper presents the development of the transfer case for a 3.5-ton commercial vehicle. A transfer case is composed of many parts, including helical gear, shaft, bearing, planetary gear, and others. Helical gears are currently used as power transmitting gears due to their relatively smooth and silent operation, large load carrying capacity, and operation at higher speeds. The key parameter in transfer case development is the bending stress at the root of a tooth in the helical gear. The bending stress of the helical gear has been studied through theoretical calculation and finite element method (FEM) analysis. Major factors of the bending stress calculation are determined according to American Gear Manufacturers Association (AGMA) standards, and FEM model analysis of the helical gear is conducted. FEM results are compared with theoretical calculations and the difference of the bending stress is described.