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시멘트 복합체 내부 철근의 가속 부식을 통한 부식량 정량화
강유진 ( Gankhuyag Burt Uujin ),이종구 ( Yi Chongku ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
철근의 부식이 진행되면 부식생성물로 인해 철근의 체적이 증가하며 구조물의 균열을 발생시키고, 이러한 균열을 통하여 공급되는 여러 부식 요소들에 의해 부식은 더욱 가속된다. 이러한 철근의 부식현상에 대한 이해와 부식의 정확한 측정방법을 살펴보고자 연구를 진행하게 되었다. 본 연구로 선형 분극 저항법을 이용하여 염화물이 첨가된 콘크리트에 매립된 철근의 전기화학적 부식 거동과 염화물 첨가량에 따른 철근의 부식 상태를 비교하고 평가하였다. 실험은 총 A(수돗물), B(CaCl2 10 %), C(HCl 3%) 3개 실험 그룹으로 분류하여 모르타르 시편을 제작하였으며, 시간별 각 실험군의 부식 진행속도와 거동을 살펴보았다.
강유진 ( Gankhuyag Burt-uujin ),장인동 ( Jang Indong ),이종구 ( Yi Chongku ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
본 연구는 길이 1m의 SD400 D13, D10 철근 시편의 중앙 20cm를에 염화칼슘(CaCl2-10%)과 10V의 전압을 인가하여 부식을 촉진시킨 수, 부식으로 인해 줄어든 단면적과 철근의 인장 거동과의 관계를 파악하기 위한 것이다. 9주 동안의 실험을 통해 평균 15.57%의 단면 손실을 이루었으며, 이때 부식이 진행된 시편에서 항복응력의 저하, 탄성계수 감소 등의 현상이 나타난 것을 확인할 수 있다.
철근의 사전 부식이 콘크리트 내부 부식속도에 미치는 영향
강유진 ( Gankhuyag Burt Uujin ),장인동 ( Jang In-dong ),이혜린 ( Lee Hyerin ),이종구 ( Yi Chong-ku ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
본 연구는 콘크리트에 매립된 철근이 부식됨에 따라 증가하는 구조물 보수비용을 저감하기 위해 사전 부식된 철근이 콘크리트에 미치는 영향을 분석하기 위해 진행되었다. 하지만 이 분야에서 pre-rust된 철근의 부식속도와 부식량을 산정한 연구는 드물게 수행되었기에 본 연구에선 사전 부식을 유도하는 3가지 용액(Water, CaCl2, HCl)을 사용하여 철근을 부식시킨 후 시멘트 모르타르에 매립하여 각 용액이 철근 부식에 미치는 영향을 자연전위, 분극저항 분석을 통해 알아보았다. 실험결과를 통해 Pre-rust 종류 따라 시멘트 복합체 매립된 철근의 부식속도가 3.7배 이상 증가할 수 있음을 확인할 수 있었다.
최윤정,백성호,강운용,유소영,김성윤,이지성,Tal Burt,김태원 대한의학회 2016 Journal of Korean medical science Vol.31 No.5
Considering general public as potential patients, identifying factors that hinder public participation poses great importance, especially in a research environment where demands for clinical trial participants outpace the supply. Hence, the aim of this study was to evaluate knowledge and perception about clinical research in general public. A total of 400 Seoul residents with no previous experience of clinical trial participation were selected, as representative of population in Seoul in terms of age and sex. To minimize selection bias, every fifth passer-by was invited to interview, and if in a cluster, person on the very right side was asked. To ensure the uniform use of survey, written instructions have been added to the questionnaire. Followed by pilot test in 40 subjects, the survey was administered face-to-face in December 2014. To investigate how perception shapes behavior, we compared perception scores in those who expressed willingness to participate and those who did not. Remarkably higher percentage of responders stated that they have heard of clinical research, and knew someone who participated (both, P < 0.001) compared to India. Yet, the percentage of responders expressed willingness to participate was 39.3%, a significantly lower rate than the result of the India (58.9% vs. 39.3%, P < 0.001). Treatment benefit was the single most influential reason for participation, followed by financial gain. Concern about safety was the main reason for refusal, succeeded by fear and lack of trust. Public awareness and educational programs addressing these negative perceptions and lack of knowledge will be effective in enhancing public engaged in clinical research.
Integrated genomic analysis of recurrence-associated small non-coding RNAs in oesophageal cancer
Jang, Hee-Jin,Lee, Hyun-Sung,Burt, Bryan M,Lee, Geon Kook,Yoon, Kyong-Ah,Park, Yun-Yong,Sohn, Bo Hwa,Kim, Sang Bae,Kim, Moon Soo,Lee, Jong Mog,Joo, Jungnam,Kim, Sang Cheol,Yun, Ju Sik,Na, Kook Joo,Cho BMJ Publishing Group Ltd 2017 Gut Vol.66 No.2
<P>Conclusion We developed an easy-to-use prognostic model with three sncRNAs as robust prognostic markers for postoperative recurrence of ESCC. We anticipate that such a stratified and systematic, tumour-specific biological approach will potentially contribute to significant improvement in ESCC treatment.</P>
Graphite-based selectorless RRAM: improvable intrinsic nonlinearity for array applications
Chen, Ying-Chen,Hu, Szu-Tung,Lin, Chih-Yang,Fowler, Burt,Huang, Hui-Chun,Lin, Chao-Cheng,Kim, Sungjun,Chang, Yao-Feng,Lee, Jack C. The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.33
<P>Selectorless graphite-based resistive random-access memory (RRAM) has been demonstrated by utilizing the intrinsic nonlinear resistive switching (RS) characteristics, without an additional selector or transistor for low-power RRAM array application. The low effective dielectric constant value (<I>k</I>) layer of graphite or graphite oxide is utilized, which is beneficial in suppressing sneak-path currents in the crossbar RRAM array. The tail-bits with low nonlinearity can be manipulated by the positive voltage pulse, which in turn can alleviate variability and reliability issues. Our results provide additional insights for built-in nonlinearity in 1<I>R</I>-only selectorless RRAMs, which are applicable to the low-power memory array, ultrahigh density storage, and in-memory neuromorphic computational configurations.</P>
P. Crolla,A. J. Roscoe,A. Dy?ko,G. M. Burt 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The effective integration of distributed energy resources in distribution networks demands powerful simulation and test methods in order to determine both system and component behaviour, and understand their interaction. Unexpected disconnection of a significant volume of distributed generation (DG) could have potentially serious consequences for the wider power system, and this means DG sources can no longer be treated as purely negative load. This paper proposes a method of testing loss-of-mains (LOM) detection and protection schemes for distributed energy resources (DER) using realtime power hardware-in-the-loop (RT PHIL). The approach involves connecting the generator and interface under test (e.g. motor-generator set or inverter, controlled by an RTS ?Real Time Station) to a real-time simulator (in this case an RTDS ? Real Time Digital Simulator) which simulates the local loads and upstream power system. This arrangement allows observation of the interaction with other controls in the network beyond the local microgrid area. These LOM detection schemes are of increasing importance because with growing penetration levels of distributed generation the network operator has less visibility and control of the connected generation. Furthermore when the generation and load in a particular network area are closely matched (e.g. a grid-connected microgrid), it becomes increasingly difficult to detect a loss of grid supply at the generator. This work builds upon the existing LOM testing methodology developed previously for the Energy Networks Association in the United Kingdom. By utilising RT PHIL and a laboratory microgrid, the testing environment has been brought to a new level of functionality where system integrity can be more rigorously and realistically evaluated.