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하이볼륨 플라이애시 콘크리트의 철근부식 및 염소이온 확산 특성
권순오,배수호,이현진,정상화,Kwon, Soon-Oh,Bae, Su-Ho,Lee, Hyun-Jin,Jung, Sang-Hwa 한국건설순환자원학회 2014 한국건설순환자원학회 논문집 Vol.2 No.1
이 연구의 목적은 하이볼륨 플라이애시(HVFA) 콘크리트의 강도수준 및 플라이애시의 혼입률별로 콘크리트 내의 철근부식 및 염소이온 침투 저항성을 평가하는 것이다. 이를 위하여 물-결합재비 및 플라이애시 혼입률에 따라 철근 상부를 노출시킨 원주형 공시체와 통상적인 원주형 공시체를 제작하였으며, 이들 각각에 대해 압축강도 및 염소이온 침투 저항성 시험과 전기화학적 방법에 의한 철근부식 촉진시험을 수행하였다. 실험 결과, 대체적으로 플라이애시 혼입률이 많을수록 HVFA 콘크리트의 압축강도는 감소하였으나, 철근부식 및 염소이온 침투 저항성은 크게 개선되는 것으로 나타났다. The purpose of this experimental research is to evaluate the resistance of reinforcement corrosion and chloride ion penetration of high volume fly ash (HVFA) concrete. For this purpose, concrete test specimens were made for various strength level and replacement ratio of fly ash, and then compressive strength and diffusion coefficient for chloride ion of them were measured for 28, 91 and 182 days, respectively. Also, corrosion monitoring by half cell potential method was carried out for the made lollypop concrete test specimens to detect the time of corrosion initiation for reinforcement in concrete. As a result, it was observed from the test results that compressive strength of HVFA concrete was decreased with increasing replacement ratio of fly ash but long-term resistance against reinforcement corrosion and chloride ion penetration of that was increased.
매입형 영구자석 동기전동기의 약계자 제어에 따른 전자기적 특성 연구
권순오,Kwon, Soon-O 대한전자공학회 2013 전자공학회논문지 Vol.50 No.9
This paper deals with electromagnetic characteristics of IPMSM (Interior Permanent Magnet Synchronous motor) caused by field weakening current control. In order to extend operation speed, field weakening current control is generally used in IPMSM operation. During field weakening, distorted linkage fluxes are resulted by saturation of core material. Therefore, distorted input voltage waveform is required for sinusoidal current input. As the current vector angle increases for field weakening, distortion of linkage flux and back-emf becomes significant. This situation is analyzed by 2-dimensional finite element analysis and verified by experiment. With the results, it is concluded that motor parameters, such as linkage flux by permanent magnet, phase resistance, d-q axis inductance, are insufficient for estimating required voltage for given speed especially in field weakening and additional considerations for increased harmonics of voltage are required. 본 논문에서는 IPMSM(Interior Permanent Magnet Synchronous Motor)의 약계자 제어에 따른 전자기적특성을 다룬다. IPMSM의 운전 속도 영역을 확장하기 위해 약계자 전류제어가 일반적으로 사용되며 약계자 운전 중에는 전기강판의 자기적 포화에 의해 쇄교자속의 왜형이 발생하게 된다. 따라서 정현파 전류 입력을 위한 전압 파형은 왜형을 갖게 된다. 약계자 전류 증가에 따라 이러한 전압 왜형은 더욱 크게 발생되며 기본파 전압에 비해 상당한 크기의 고조파 전압을 필요로 하게 된다. 이러한 현상을 2차원 유한요소 해석을 이용하여 확인하였으며 시험을 통해 검증하였다. 본 연구 결과를 통해 IPMSM의 특성 분석에 사용되는 d-q축 등가회로 파라미터 즉, 영구자석에 의한 쇄교자속, d-q축 인덕턴스는 산정 단계에서 기본파 물리량으로 계산되므로 약계자 운전시 발생하는 전압 왜형을 예측할 수 없음을 알 수 있다. 결국 주어진 전압에서 얻을 수 있는 속도 예측에 오차를 수반하게 되며 전압고조파에 대한 대책이 필요하다.
권순오(Soon-Oh Kwon),신기현(Kee-Hyun Shin) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Air entrainment can become a significant problem in a web handling process. The development of air film<br/> between a web and an idle roller can cause a reduction of traction and traction coefficient, by which a slip is<br/> occurrred. Computational and experimental study was carried out to describe the slippage of an idle roller for<br/> given operating conditions, tension and web velocity. An extended mathematical model to find out a slip<br/> condition was developed by using the models of air film height, dynamic traction coefficient, and torque<br/> balance of a rotational roller. And by using the extended model, a mechanism to define the slippage between<br/> the roller and the moving web was suggested. The results of simulation and experiment showed that the<br/> extended dynamic model could properly characterize the rotational motion of the idle roller by considering<br/> dynamic traction coefficient. By examining the rotational motion of the idle roller with web dynamics(speed),<br/> the mechanism to define al slip condition between the roller and the web was found to be effective.
개 혈액 재료에서의 Brucella 검출을 위한 진단방법의 비교
권순오 ( Soon Oh Kwon ),람쯩꽝 ( Truong Quang Lam ),허문 ( Moon Her ),안동춘 ( Dong Chun Ahn ),박상희 ( Sang Hee Park ),박미연 ( Mi Yeoun Park ),이영주 ( Young Ju Lee ),한태욱 ( Tae Wook Hahn ) 한국가축위생학회 2009 韓國家畜衛生學會誌 Vol.32 No.4
Canine brucellosis produce abortions and infertility in dogs and currently is diagnosed by serological methods such as rapid slide agglutination test with 2-mercaptoethanol (2-ME RSAT) and immunochromatographic assay (ICA). Bacterial isolation is considered gold standard for Brucella diagnosis and the polymerase chain reaction (PCR) is an alternative method to bacterial isolation. A total of 36 whole blood samples were collected from dogs reared in area of Chuncheon and were subjected to serology (2-ME RSAT and ICA for B. canis, Rose Bengal test and C-ELISA for B. abortus), blood culture and 3 types of PCRs (BSCP31, 16s rRNA, and OMP-2). All blood samples were negative by serology and blood cultures. The BCSP31 and the OMP-2 PCR detected 5 samples were positive whereas the 16S rRNA PCR detected all samples were negative as serological methods and blood culture did. From the results observed in the present study, we conclude that 16S rRNA PCR could be used for direct PCR for canine blood samples.
고조파 전류를 이용한 영구자석형 동기 전동기의 토크 리플 저감
권순오(Soon-O Kwon),이정종(Jeong-Jong Lee),이근호(Geun-Ho Lee),홍정표(Jung-Pyo Hong) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
This paper deals with the torque ripple reduction of permanent magnet synchronous motor using harmonic current injection. Torque ripple of electric motor reduces system stability and performances, therefore efforts to reduce torque ripple are exerted in the design process. Torque ripple can be reduced by appropriate pole/slot combination, skew of rotor or stator, design of magnetic circuit, etc. In addition, torque ripple can be also reduced by input voltage and current, and many researches have been conducted to reduce torque ripple for six-step drive. Torque ripple reduction for current vector controlled permanent magnet synchronous motor also have been conducted and verified by investigating back emf wave form. Torque ripple reduction in this paper started from getting torque profile according to input current and electrical angle calculated by FEA, then instantaneous currents at each electrical angles for constant torque are calculated and applied to experiments. Therefore, 0% of torque ripple can be obtained theoretically with harmonic current injection. In order to maximize the effect of torque ripple reduction, a BLDC motor having high harmonic component of back emf is chosen. With sinusoidal current drive, over 100% of torque ripple is obtained initially, then 0.5 % of torque ripple is obtained by FEA using harmonic current injection. The effect is verified by experiment and the presented method can be effectively applicable to Electric Power Steering(EPS).