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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.
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 ) 한국동물위생학회 2009 한국동물위생학회지 (KOJVS) 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.
비정질 강섬유와 유기섬유를 이용한 하이브리드 섬유보강 콘크리트의 작업성 및 강도 특성
권순오 ( Soon Oh Kwon ),배수호 ( Su Ho Bae ),이현진 ( Hyun Jin Lee ),김진우 ( Jin Oo Kim ),이준철 ( Jun Cheol Lee ) 한국복합신소재구조학회 2015 복합신소재구조학회논문집 Vol.6 No.4
The purpose of this experimental research is to evaluate the workability and strength properties of hybrid fiber reinforced concrete containing amorphous steel fiber and organic fiber. For this purpose, the hybrid fiber reinforced concrete containing amorphous steel fiber(ASF) with polyamide(PA) and polyvinyl alcohol(PVA) fiber, respectively were made according to their total volume fraction of 0.5% for water-binder ratio of 33%, and then the characteristics such as the workability, compressive strength, and flexural strength of those were investigated. It was observed from the test results that the workability and compressive strength at 7 and 28 days were decreased and the flexural strength at 7 and 28 days was increased with increasing ASF and decreasing organic fiber.
섬유보강 시멘트 복합체의 특성에 미치는 선반 스크랩 규격의 영향
권순오 ( Soon Oh Kwon ),배수호 ( Su Ho Bae ),이현진 ( Hyun Jin Lee ),김성욱 ( Sung Wook Kim ),박정준 ( Jung Jun Park ) 한국복합신소재구조학회 2015 복합신소재학회논문집 Vol.6 No.2
It should be noted that the use of the lathe scrap for making fiber reinforced cementitious composites(FRCCs) raised friendly environmental effect as well as economy because the lathe scrap is a by-product of steel manufactures and is occurred when lathe and milling works of them are conducted to process steel manufactures. Thus, the purpose of this research is to investigate the effect of measurements of lathe scrap on the characteristics of FRCCs. For this purpose, various lathe scraps were collected from processing plants of metal, and then these were processed 10mm, 20mm, and 40mm in lengths for 2mm and 4mm in widths, respectively. FRCCs containing lathe scraps were made according to their widths and lengths, and then characteristics such as the workability, compressive strength, and flexural strength of those were evaluated. As a result, it was observed from the test results that the optimum measurements of the lathe scrap for manufacturing FRCCs was 2mm in width and 40mm in length.
Soon Oh Kwon(권순오),Kyeong-Hyeon Byeon(변경현),Jae-Wook Chung(정재욱),Yun-Sok Ha(하윤석),Seock Hwan Choi(최석환),Bum Soo Kim(김범수),Hyun Tae Kim(김현태),Tae-Hwan Kim(김태환),Eun Sang Yoo(유은상),Ghil Suk Yoon(윤길숙),Jun Nyung L 대한비뇨기종양학회 2020 대한비뇨기종양학회지 Vol.18 No.2
Purpose: To determine an appropriate surgical technique, it is important to predict pathological results for patients with clinically localized prostate cancer (PCa) eligible for nerve-sparing radical prostatectomy (NSRP). Several studies have highlighted that serum testosterone level was associated with aggressive features of PCa. Therefore, we analyzed factors, including serum testosterone, to predict upstaging and upgrading after surgery for patients with clinically localized PCa eligible for NSRP. Materials and Methods: We retrospectively evaluated patients who underwent radical prostatectomy (RP) between January 2015 and May 2018 at our institution. Patients with Gleason grade group 1 or 2 on biopsy, prostate-specific antigen<10, and ≤clinical/radiologic stage T2 were included in this study. Upstaging and upgrading were defined as pathological stage≥T3a and Gleason grade group≥3, respectively. We evaluated the patients’ demographics and outcomes according to upstaging and upgrading after surgery. Predictive factors for upstaging and upgrading were analyzed using a multivariate logistic regression model. Results: Of 108 patients included in the study, upstaging and upgrading after surgery were observed in 24 (22.2%) and 36 (33.3%), respectively. Low serum testosterone level, small prostate size, and positive core number≥3 on biopsy were identified as predictive factors for upstaging in multivariate analysis. Although serum testosterone was associated with upgrading in univariate analysis, only clinical/radiologic stage and biopsy Gleason grade group were observed as predictive factors for upgrading in multivariate analysis. Conclusions: Serum testosterone level was identified as a predictive factor for upstaging after RP for clinically localized PCa eligible for NSRP.
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.