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상태관측기에 의한 영구자석 선형동기전동기의 슬라이딩모드제어에 관한 연구
황영민,신동률,최거승,조윤현,우정인 한국조명전기설비학회 2002 조명·전기설비학회논문지 Vol.16 No.2
영구자석형 선형동기전동기(PMLSM)는 고속, 고추력의 직선추진이 가능하므로 산업현장에서 위치결정장치나 물류반송시스템 및 공작기계 등의 선형 서보 시스템에 이용이 되고 있다. 본 논문에서는 PMLSM의 AC 서보화를 위해 동기 프레임상에서 제어구조가 미리 설정된 스위칭 함수에 따라 불연속적으로 변화되는 가변구조 전류제어방식 및 간접 벡터제어이론을 기본으로하여 도달시간을 제거하고, 구동시스템의 추력 이용도를 높이기 위해 파라미터 변동과 한정된 외란에 거의 영향을 받지 않으며 오버슈트가 없는 고속응답을 실현하기 위해 슬라이딩 모드제어 알고리즘을 제안하여 PMLSM의 위치제어에 적용하고자 한다. According to the rapid growth of high speed and precise industry, the application of synchronous motor has been increased. In the application fields, these fast dynamic response is of prime importance. In particular, since the PMLSM(Permanent Magnet Linear Synchronous Motor) has characteristics of high speed, high thrust, it has been used in high-performance servo drive. From these reasons, it is recently used for high precise position control, and machine tool. In this paper, a study of the sliding mode with VSS (Variable Structure System) design for a PMLSM is presented. For fast and precise motion control of PMLSM, the compensation of disturbance and parameter variation is necessary. Hence we eliminate the reaching phase use of VSS that is changed to switching function and vector control using the state observer. And we proposed to sliding mode control algorithm so that realize fast response without overshoot, disturbance and parameter variation.
황영민,이진실,안하정,오혜련,성대경,태기융,최원일 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
We previously developed an injectable levan-based hydrogel as a temporary dermal filler. However, thelongevity and collagen stimulation effect of the levan-based hydrogel were limited. Herein, we preparedhydroxyapatite (HAp)-embedded levan composite hydrogel as a long-acting dermal filler for enhancingin vivo collagen production and anti-wrinkle efficacy. HAp amount (0.1–5 wt%) in the levan hydrogelwas optimized for stability, safety, and efficacy. Increasing the HAp amount decreased the in vitro stabilityand elastic modulus, but the composite hydrogel structure was still maintained. Furthermore, thecomposite hydrogel showed improved cell proliferation stimulation compared to the bare levan hydrogelin human dermal fibroblast cells. In vivo stability of the composite hydrogel was enhanced in contrast tothe in vitro result, showing stable residence of the composite hydrogels with 0.5 or 1 wt% HAp over8 weeks. Moreover, the excellent anti-wrinkle efficacy of composite hydrogel with 1 wt% HAp was maintainedduring 8 weeks and it showed the highest collagen production. Thus, HAp-embedded levan compositehydrogel showed potential as a dermal filler with easy injectability, biocompatibility, and longactinganti-wrinkle efficacy.
PIC Microprocessor에 의한 표시형 다기능 수직 상승 자동 용접캐리지 개발
황영민,김영빈,노인배,김영훈,김동완,우정인 동아대학교 정보기술연구소 2002 情報技術硏究所論文誌 Vol.10 No.1
In this paper, we developed the multi-function vertical digital automatic welding carriage with the display type. Firstly, we construct current and voltage digital control system for welding condition decide using digital input switch and D/A converter circuit. The proposed system controller has high economics, small size and robust characteristic to noise. Because it using PIC16C74 microprocessor. Characteristic of PIC16C74 is RISC-Like type, low cost, high output current. And For the improvement of efficiency and out response of weaving motor and traveling motor, we design and control PWM inverter using Digital PID controller.
반응표면분석법을 이용한 Lactobacillus 균주 배양조건의 통계적 최적화
황영민,이희석 한국식품위생안전성학회 2023 한국식품위생안전성학회지 Vol.38 No.5
프로바이오틱스 제품에 대한 수요가 지속적으로 증가하 고 있으며, Lactobacillus 균주가 가장 대중적인 프로바이 오틱스로 널리 사용되고 있다. 프로바이오틱스는 기준에 적합한 균수의 확보가 중요하며 제조원가나 시간 등을 낮 추기 위해 배양법의 개발이 필요하므로 Lactobacillus 생 산을 위한 배양 조건이 최적화되었다. 반응표면방법론에 의한 통계적 최적화에서 반응 변수에 영향을 미치는 독립 변수의 최적 조건은 Lactobacillus acidophilus의 경우 22.55 시간(배양시간), 25o C(배양온도), 3.41%(프리바이오틱스 농 도); Lactiplantibacillus plantarum의 경우 24시간, 30.86o C, 2.00%; Lacticaseibacillus rhamnosus의 경우 66.67시간, 35o C, 3.41%이었다. Lactobacillus의 최적 배양조건은 예측 한 결과와 실제 결과가 밀접하게 일치하는 것을 확인하였 다. 이러한 데이터는 수율 높은 Lactobacillus를 생산하는 데 중요한 포인트를 제공할 것이다. The demand for probiotic products has been steadily increasing, and Lactobacillus strains are widely used and are currently the most popular probiotics. Optimizing culture conditions for Lactobacillus production for use as probiotics will enhance their profitability by reducing production costs and time. Statistical analysis using response surface methodology revealed the following optimal sets of independent variables: 22.55 h (cultivation time), 25°C (cultivation temperature), and 3.41% (w/w, prebiotics concentration) for Lactobacillus acidophilus; 24 h, 30.86°C, and 2% (w/w) for Lactiplantibacillus plantarum; 66.67 h, 35°C, and 3.41% (w/w) for Lacticaseibacillus rhamnosus. Actual outcomes using predicted optimal conditions for Lactobacillus strains have been confirmed to closely match predicted results. This study will provide valuable guidelines for high yield Lactobacillus production.
황영민,이희석 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.3
The environmental conditions were optimized to produce the enniatin H, I, and MK1688 by Fusarium strain on cereal grain exhibiting anti-carcinogenic potential against MES-SA (human uterine sarcoma cell line), HCT15 (human colorectal carcinoma cancer cell line), and their multidrug resistance sublines. From the statistical optimization by response surface methodology, the optimal condition of independent variables affecting the response variables were 20.85 °C (temperature), 46.85% (w/w, initial moisture content), and 18.42 days (growth time) for ENN H; 23.31 °C, 44.15% (w/w) and 17.23 days for ENN I; 23.08 °C, 43.97% (w/w) and 17.06 days for ENN MK1688. In case of cytotoxic effects, ENNs significantly suppressed growth of cancer cell lines without multidrug resistance, and ENN I inhibited growth of cancer cell lines most strongly. These data will provide valuable point to produce the cyclic hexadepsipeptide exhibiting anti-carcinogenic potential from Fusarium strains.