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염해 및 중성화의 복합열화작용에 따른 콘크리트의 내구특성 평가에 관한 실험적 연구
김영봉(Kim Young-Bong),조봉석(Cho Bong-Suk),김영덕(Kim Young-Duck),나철성(Na Chul-Sung),김규용(Kim Gyu-Yong),김무한(Kim Moo-Han) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
Durability evaluations to assess the deterioration of reinforced concrete structures in the present have been considered only individual deterioration factors such as salt damage and carbonation. Also, indoor accelerated experiments have not been able to realize the combined deterioration factors that actually affect real concrete structures. Therefore, in this study, mixing design was proportioned with the various water-binder ratio 0.55 binder compositions corresponding to Type I cement without any supplementary materials(OPC), Type Ⅱ cement with 50% blast-furnace slag replacement (BFS50), TypeⅢ cement with 15% fly ash replacement (FA15), and ternary cement with TypeⅣ cement, 15% fly ash, and 35% slag replacement (BFS35+FA15). And this study is carried out to compare individual deterioration test with combined deterioration test and to investigate the effect of the permeation of deterioration factors such as CO₂ and chloride ion under the combined deterioration environments. After setting up various deterioration factors and levels such as carbonation, salt damage, and the repetition of drying-wetting, items such as carbonation depth, chloride ion penetration depth were evaluated under the combined deterioration environments. The results showed that carbonation depth, chloride ion penetration depth were increased according to the elapsed of ages. Also mixing design with BFS50% and BFS35%+FA15% exhibited higher durability factor than that made with OPC only.
염화물 이온 및 이산화탄소의 복합작용에 의한 콘크리트의 내구성상 평가에 관한 실험적 연구
김영봉 ( Kim Young-bong ),조봉석 ( Cho Bong-suk ),김영덕 ( Kim Young-duck ),김규용 ( Kim Gyu-yong ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
Recently, corrosion of reinforcement of reinforced concrete structures and carbonation is raised problem of durability because of exhaustion of river sand and rapid increase of sea sand and also, concrete structure of sea environment is attacked to combined deterioration according to penetration of chloride ion and carbonation. Therefore, in this study, mixing design was proportioned with the various water-binder ratio 0.55 binder compositions corresponding to Type I cement without any supplementary materials (OPC), Type II cement with 50% blast-furnace slag replacement (BFS50), Type Ⅲ cement with 15% fly ash replacement (FA15). and ternary cement with TypeⅣ cement. 15% fly ash. and 35% slag replacement (BFS35%+FA15%). And this study is carried out to compare individual deterioration test with combined deterioration test and to investigate the effect of the permeation of deterioration factors such as CO2 and chloride ion under the combined deterioration environments. Test result showed that mixing design with BFS50% and BFS35% + FA15% exhibited higher durability than that made with OPC only.
김영봉(KIm Young-bong) 한국언어문학회 2005 한국언어문학 Vol.54 No.-
Yeom Rak-pung's Chinese poetry' is a concept that especially designates the Chinese poetry, which has the main subject of embodying the spirit of the way for the Confucianism. In terms of Yeom Rak-pung's Chinese poetry, a great number of works can be understood a meaning without such a big difficulty, but given some works, there is also a case that is hard to be understood at all only by the contents of a letter. Like this, what experiences the difficulty sometimes in understanding Yeom Rak-pung's Chinese poetry is attributable mainly to a method that expresses the main subject. A method of expressing the main subject in Yeom Rak-pung's Chinese poetry, can be mostly classified by about three kinds. It comprises, first, the indicative mood that expresses a thing as it is, second, a metaphor that indirectly expresses compared with a different thing or phenomenon, and third, symbolism that expresses by quoting a completely different thing, with hiding the original conception. What makes Yeom Rak-pung's Chinese poetry difficult to be understood, corresponds to a case when especially having used symbolism. That is because of representing the high-level spiritual world with the highly symbolized expression. As much as a method of expressing the main subject by a symbol, is difficult for the interpretation of 'symbol,' it is not easy to find out the main subject only with the poetry itself. A great number of works have even a case that needs to grasp the main subject by what about a writer's inclination. Namely, it needs to be applied a method of 'historical-biographical criticism.' The evaluation of Yeom Rak-pung's Chinese poetry is largely crossed the sight of affirmation and contradiction. What sees the value negatively, seems to be just attributable to paying attention only to the indicative mood among methods of expressing the main subject. It is because, given the indicative mood, there are many cases that indicatively express instruction as if having moved one phrase in the sacred book. However, in case of a work that used the technique of a metaphor and a symbol, it is equipped with higher-level beauty of poetic expression, thus it is not the nature that simply lowers its value. Particularly, in case of having expressed the main subject with the technique of a symbol, it is fully succeeding even in achieving the beauty of poetic expression with the higher-level rhetorical technique as well as being faithful to a Confucianist's inborn function that the poetry needs to contribute to the enlightenment of world.
김영봉(Young-Bong Kim),이윤정(Yun-Jung Lee) 한국정보과학회 2000 정보과학회논문지 : 시스템 및 이론 Vol.27 No.2
프랙탈 영상 압축은 영상의 일부 영역이 같은 영상의 다른 영역과 거의 유사한 모양을 하고 있다는 자기유사성에 기초하고 있다. 이 압축 방법은 높은 압축률과 빠른 복원력을 제공하지만 매우 긴압축 시간을 갖는다. 압축 시간을 줄이기 위해 가장 많은 시간이 소요되는 레인지 블록과 도메인 블록간의 비교 탐색 과정을 줄이려는 시도가 꾸준히 이루어져 왔다. 이 연구들은 크게 탐색할 도메인 영역에 제한을 가하는 방법과 도메인 블록의 탐색 순서를 주어진 조건을 만족하는 최초의 도메인을 찾는 방법으로 나누어 볼 수 있다. 그러나 대부분의 프랙탈 영상 압축 기법은 아직도 많은 압축 시간을 필요로 하고 있다. 본 연구에서는 영상 압축 시간을 획기적으로 줄이기 위해 레인지 블록간의 유사성을 이용하여 몇 개의 레인지 블록에 대해서만 도메인 탐색을 시도하는 새로운 방법을 제안한다. 이를 위해 모든 레인지 블록은 각각의 모양을 바탕으로 몇 개의 유사 그룹으로 분류되며, 각 그룹의 대표 블록에 대해서만 도메인 탐색을 실행하게 된다. 또한 이 방법을 다른 프랙탈 영상 압축 기법의 사전 작업으로 활용한다면 더욱 큰 효과를 보게 될 것이다. The fractal image compression is based on the self-similarity that some area in an image is very similar to others. This compression method offers high compression ratio and fast decompression, but it has very long encoding time. To cut-off the encoding time, most researches give a restriction on domain blocks to be compared with a range block or make an effective search sequence of the domain blocks for a range block. However, most of them take much encoding time yet. In this research, we propose an algorithm that greatly reduces the encoding time by considering the coherence between range blocks. This algorithm first classifies all range blocks into some groups using the coherence between range blocks, and then searches corresponding domain blocks only for the key block of each group. If this scheme is joined in a prior work of the other fractal compression algorithm, it will give a great effectiveness to encoding time.
경화콘크리트의 염화물 분석시험 정밀도 향상을 위한 실험적 연구
김영봉(Kim Young-Bong),김영선(Kim Young-Sun),이의배(Lee Eui-Bae),남정수(Nam Jeong-Soo),김규용(Kim Gyu-Yong),김무한(Kim Moo-Han) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Worldwide, Certification systems for standard of material and quality of product exist very variously. Korean industrial Standard (KS) is most representatively certification systems in Korea. But laboratory of Korea uses often ASTM, RILEM and JIS and these standards do not get into unionization. So, granted that experiment is same, result still can different. Specially, the difference occurs of concrete chloride test. Therefore, this research measured chloride amount of hardened concrete using identical material and wished to improve accuracy of chloride estimation as that comparison evaluate to each examination.