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최성호,조정민,전기영,김성남,성낙규,김용주,한경희 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
In this paper, we adapted BLDC motor to PV water pumping systems to maintain high efficiency in the wide speed area. Also to design confidence, we adapted the vector control that drive the maximum torque at each speed limit. We designed optimal gain value of current, speed and pressure PI controller. Inverter gate pulse used Space Vector PWM to reduce torque pulsation of BLDC motor. Finally it was improve general matters of high water storage tank method by direct water supply pumping method.
컴퓨터 작업 시 의자 등받이 위치가 근육 활성도에 미치는 영향
김민우,변승진,이경은,정소영,조주영,최원자,최찬양,김경 대구대학교 특수교육재활과학연구소 2011 再活科學硏究 Vol.29 No.1
이 연구는 컴퓨터 작업시 의자 등받이 위치가 근육활성도에 미치는 영향을 알아보기 위해 36명의 근골격에 문제가 없는 성인 남녀가 참가하였으며 대상자들은 등받이가 뒤에 있는 의자와 등받이가 없는 의자, 등받이가 앞에 있는 우리들 의자를 무작위로 배정하고 동일한 컴퓨터 작업을 실시하게 하였다. 실험 중, 표면근전도기를 사용하여 의자에 따른 위등세모근, 머리널판근 그리고 척주세움근의 근활성도 변화를 측정하였다. 이 연구의 결과를 종합해보면 등받이가 앞에 있는 의자는 허리 근육의 부담을 줄이지만 목근육에 부담이 늘어나고 등받이가 뒤에 있는 의자와 없는 의자는 허리근육에는 다소 무리가 가지만 목근육에는 부담이 덜하다는 것을 알 수 있었다. 이러한 결과로 환자의 증상에 다라 컴퓨터 작업을 하는 동안 의자 등받이의 위치를 조절하여 치료에 도움이 될 수 있다고 생각되어진다. Objective : In this study, we checked and observed people's change of body muscle and muscle activity who do computer work on different chairs. We set three kind of chairs which one is a stool and another one is the back is fixed, and the other one is the back is fixed in front of chair. Subject : Accounting for 36 health men and women, we divided these people to 3 groups and put them on the three cases(position 1, position 2, position 3). We measured muscle activity of upper trapezius, Splenius Cervics, Erector Spinae from the groups by using surface electromyogram system. Methods : The standard of the electromyogram was 'reference voluntary contraction', and we carried out 'one way anova' to compare muscle activity of three groups. Results : In position 1, reference voluntary contraction of upper trapezius muscle activity was 123.2821%, Splenius Cervics was 141.7526%, and Erector Spinae was 254.5233%. In position 2, reference voluntary contraction of upper trapezius muscle activity was 132.9395%, Splenius Cervics was 141.7526%, and Erector Spinae was 246.6540%. In position 3, reference voluntary contraction of upper trapezius muscle activity was 190.6487%, Splenius Cervics was 270.2332%, and Erector Spinae was 182.1021%. Both upper trapezius and Splenius Cervics muscle activity of position 3 group was higher than the others groups. In position 1 group, Erector Spinae muscle activity was hight than the other groups. And either was position 2 group's(p<0.05). Conclusion : Therefore the chair which is the back is fixed in front is more comfortable for waist muscle but it's not good for neck. And the other chairs are better in waist muscle but not in neck muscle. So far, when we do a computer work, it's prefer to sit on the group 1&2's chairs to reduce neck muscle's stress and sit on group 3's chair to reduce waist muscle's stress.
Preparation of GF37 for the improvement of respiratory inflammation
Ju Yeong So,Min Jung Kim,Go Woo Choi,You Jin Lee,Yun Ho Jo,Sejeong Kim,Danhui Kim,Sang Hun Lee,Een Yeong Park,Dae Seok Yoo,Jin Seong Kim,Sang Won Cho,Young Soo Kim,Hak Joo Choi,Mi Kyung Pyo 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Panax ginseng (PG) and Perilla frutesens (PF) leaves have antioxidant and anti-inflammatory action, which can alleviate various diseases caused by fine dust. Therefore, the purpose of this study is to find the optimal ratio of ginseng and perilla leaves to maximize the anti-inflammatory action. PG and PF were extracted three times for 6 h at 70℃ with 70% ethanol and concentrated in vacuum, respectively, and then powdered by spray dryer. PG:PF were each made at different ratios to make 9 samples; CHJ1 (1:9), CHJ2 (2:8), CHJ3 (3:7), CHJ4 (4:6), CHJ5 (5:5), CHJ6 (6:4), CHJ7 (7:3), CHJ8 (8:2), CHJ9 (9:1). Each sample was measured TNF-a, IL-6, and ROS against fine dust (PM10) using MH-S cells. Among the 9 mixed samples, CHJ2 and CHJ3 inhibited the inflammation and oxidative stress induced by fine dust the best. In a confirmation experiment comparing these samples with PG and PF samples, the CHJ2 sample was finally selected because it had the best anti-inflammatory and antioxidant effects at a low concentration. Finally, a CHJ2 sample in which PG and PF were mixed in a 3:7 ratio was selected as a material for improving respiratory inflammation, and was named GF37.
부스트 컨버터의 모델링과 단일 루프 & 이중 루프 제어기의 성능 비교
조영민(Jo Yeong-Min),이주아(Lee Ju-A),김용래(Kim Yong-Rae),김수빈(Kim Soo-Bin),송승호(Song Seung-Ho),최주엽(Choi Ju-Yeop) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.4
To maximize the amount of power generated in a photovoltaic inverter, MPPT (Maximum Power Point Tracking) is an essential function of a photovoltaic (PV) inverter. A PV inverter generally consists of a DC/DC converter (boost converter) and a DC/AC inverter. For stable MPPT control, the controller of the boost converter must be properly designed. In this study, the nonlinear characteristics of solar cells were linearized and modeled for a proper controller design, and an analog controller was designed using MATLAB and converted into a digital controller. The controller was simulated using a designed controller based on PSIM, and the performances of a single-loop controller and dual-loop controller were compared. In addition, the performance of the controller was verified and compared experimentally by applying the designed controller to a commercial PV inverter.
이차성 부신피질기능저하와 동반된 가역성 미만성 식도경련
주현수 ( Ju Hyeon Su ),홍수진 ( Hong Su Jin ),박정훈 ( Park Jeong Hun ),조원영 ( Jo Won Yeong ),양재훈 ( Yang Jae Hun ),이재학 ( Lee Jae Hag ),김환열 ( Kim Hwan Yeol ),고봉민 ( Go Bong Min ),유창범 ( Yu Chang Beom ),조주영 ( Jo Ju 대한소화기기능성질환·운동학회 2003 Journal of Neurogastroenterology and Motility (JNM Vol.9 No.2
A forty two year-old female patient came to our hospital due to chest pain and difficulty in swallowing. She presented with dysphagia for solids and liquids. Endoscopic findings showed chronic gastritis with bile reflux and remnant food material. Esophage