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철도교량에 거동발생 시 응력분포 분석에 따른 적정 방수재료 선정을 위한 평가 방법
오규환 ( Oh Kyu-hwan ),안기원 ( An Ki-won ),김수연 ( Kim Soo-yeon ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
To measure the effect of the stress-strain dispersion across the installed waterproofing layer on the concrete surface, a strain gauge was attached to the gap between the waterproofing layer and the concrete structure at specified points of upper, center and bottom of the load-displacement simulation specimen, and the peak stress-strain at the displacement interface were measured and compared with stress-strain at other areas to analyze each material types' stress-strain dispersion ratio properties. Based on the results of the testing, it was shown that materials with high load-displacement resistance performance accordingly had high stress-strain dispersion ratio results, and the materials from highest performance to lowest performance were; CAS, SAS, PUC and CSC.
오규환 ( Oh Kyu-hwan ),강파 ( Jiang Bo ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
The substrate behavior response testing outlined in KS F 2622 evaluates the leakage cause of waterproofing membrane systems when subjected to the concrete joint load behaviors by removing the waterproofing layer after testing, relying mostly on visual observation and subjective analysis. A non-destructive leakage cause and failure type analysis method is proposed currently in this study by the means of detecting leakage paths using thermal emission imaging systems. Test specimens are placed in varying temperature conditions after the concrete joint movement testing and are scanned using the thermal emission camera to determine the location and dimension of the adhesion failure/leakage path beneath the waterproofing membranes.
오규환(Oh Kyu hwan,吳珪煥),김민국(Kim Min gook,金玟局),정한데로(Jung Han dero,丁한데로) 형태론 2014 형태론 Vol.16 No.2
본고에서는 최형용(2013)을 개관하고 한국어 형태론의 유형론과 관련한 쟁점들을 부각하여 이에 대한 필자들의 견해를 제시하였다. 본고의 논의는 다음과 같이 정리할 수 있다. 첫째, 최형용(2013)에서 문제 제기의 발단이 된 '굴절'이라는 용어는 단어형이 변화하는 방식을 가리키기도 하지만 의미ㆍ기능적인 것으로 이해할 수도 있다. 따라서 한국어 문법 기술에서 굴절이라는 용어를 이해할 때에는 이러한 사정을 고려할 필요도 있음을 주장하였다. 둘째, 조사와 어미를 문법적 단어로 설정하는 '분석적 체계'는 그 나름의 장점을 지니지만 한국어의 형태론적 특성을 설명하거나 한국어와 다른 언어를 유형론적으로 비교하기 위하여서는 조사와 어미를 접사로 간주하는 '종합적 체계'도 그 나름대로의 의의를 지니고 있음을 논의하였다. 한편 최형용(2013)이 '음운론적 단어'로 간주한 '어절'은 딕슨ㆍ아이켄발트(2002)에서 제안한 '음운론적 단어'와 거리가 멀다는 점과, 비교적 명확하게 정의할 수 있는 것처럼 보이는 '문법적 단어'의 경우에도 이를 정의하는 일이 쉽지 않다는 문제가 있음을 지적하였다. 셋째, 유형론적인 특수성을 강조하는지, 보편성을 강조하는지에 따라 어휘적 단어의 분류 체계는 달리 세워질 수 있다는 점을 지적하고 한국어의 유형론적 보편성과 특수성을 잘 드러낼 수 있는 어휘적 단어의 분류 체계를 제안하였다. 넷째, 한국어 형태론의 현저성을 나타내어 주는 통합성 지수를 산출할 때에는 한자 형태소와 영형태소의 분석이 문제가 될 수 있는데 그 분석 방법에 따라 통합성 지수가 달리 산출될 수도 있다는 점을 언급하였다. 다섯째, '단어 기반 모형'만이 한국어 단어 형성 과정을 설명할 수 있는 유일한 모형이 아니며, '형태소 기반 모형'과 '단어 기반 모형'이 가지는 장단점을 고려할 필요가 있음을 강조하였다. In this article, we review Choi(2013) critically and emphasize our opinions about the relevant issues of linguistic typology of Korean morphology. Our discussions can be summarized as follows. First, the term 'inflection', which can be seen as the beginning of problems in Choi(2013) not only refers to the manner or technique of varying of word-form, but also can be interpreted as something semantic or functional. Thus, this needs to be considered, if we understand the term 'inflection' in the context of the description of Korean grammar. Second, so-called 'analytic system', in which both 'josa(조사)' and 'emi(어미)' are regarded as grammatical words has its own merits. However, for the sake of revealing the morphological traits of Korean or of contrasting Korean with other languages from linguistic typological perspectives, what we call 'synthetic system', in which both 'josa(조사)' and 'emi(어미)' are seen as affixes may have more advantages than 'analytic system'. And 'ejel(어절)' which might be equal to 'phonological word' in Choi(2013) is different from 'phonological word' which is suggested in Dixon & Aikhenvald(2002). In case of 'grammatical word', though it seems easy to give a definition of it, it is hard to define it to all intents. Third, We argue that the classification of lexical words could vary with the typological viewpoints. So, a classification of lexical words can be composed differently according to which trait is stressed between linguistic typological universals and particularities. Then we suggest our own classifications of lexical words that can represent linguistic typological universals and particularities of Korean morphology respectively. Fourth, in calculating the 'index of synthesis' which shows the morphological prominence, the analyses of Sino-Korean morphemes and zero morphemes could be a problem, so we show that the results of calculating the 'index of synthesis' can vary with the way of analyzing given morphemes. Fifth, 'word-based model' is not the sole approach to explain word-formation processes of Korean. Accordingly, considering the (de)merits of 'morpheme-based model' and 'word-based model', we emphasize that a balanced approach in between two models is required.
지하 콘크리트 구조물 조인트에 대한 멤브레인 방수시스템의 복합 환경 대응 성능 평가 방법
오규환 ( Oh Kyu-hwan ),김병일 ( Kim Byoung-il ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
There are various national standards designed to test the physical properties of waterproofing materials for the respective countries based on each of their environmental parameters, variables and requirements. The problems of these standard systems can be outlined in the following: (1) there are too many test methods and criteria to satisfy in order assess one waterproofing membrane system, and (2) there is currently no known method to compile the separate testing results to provide a comprehensive report on waterproofing system durability. This paper outlines and compares the performance testing results of various types of asphalt waterproofing membrane systems and discusses the potentials of a complex environmental deterioration analysis method.
합벽구간 및 지하구조물 외벽에 사용되는 방수재료 내진 성능실험방법
오규환 ( Oh¸ Kyu-hwan ),김수연 ( Kim¸ Soo-yeon ),오상근 ( Oh¸ Sang-keun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This study introduces and demonstrates the application of an experimental regime for anti-seismic performance evaluation of waterproofing materials to used for concrete pile walls. Concrete pile walls are subject to high degree of seismic load, and the occurring stress can affect the waterproofing integrity of the structure, but there is currently no existing methodology or standard for evaluating this property of waterproofing materials. To propose and conduct this evaluation, a new testing apparatus was designed and manufactured intended to be able to test an installed waterproofing material’s seismic resistance performance.
가습조건이 사형유로를 채택한 고분자 전해질 연료전지의 성능에 미치는 영향에 대한 전산유체역학 해석 연구
오규환(Gyu Hwan Oh),이규진(Kyu-Jin Lee),남진현(Jin Hyun Nam),김찬중(Charn-Jung Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.8
Water management has been recognized as a crucial factor for achieving better performance and stability in polymer electrolyte membrane fuel cells (PEMFCs). Proper water management should provide favorable water conditions, including the local humidity, membrane water content, and liquid water saturation in PEMFCs, thereby leading to more uniform electrochemical reaction and current generation. In this study, computational fluid dynamics (CFD) simulation was conducted to investigate the effects of the cathode relative humidity (RH) on the performance of a 3 by 3 cm<SUP>2</SUP> PEMFC with serpentine flow fields. The CFD results showed that the best performance of the PEMFC was obtained for the cathode RH of 80%, but the performance variation was small for the cathode RH range of 60~100%. However, the loss of the PEMFC performance was significant when the cathode RH was reduced below 40%. The reason for such performance variation was investigated through the detailed inspection of ohmic loss, activation and concentration overpotential, and water and current distributions.