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패각류를 함유한 해사 사용 철근콘크리트의 강도특성 및 전단에 관한 실험적 연구
김정섭,조철희,최진석,김민국 朝鮮大學校 建設技術硏究所 2002 建設技術硏究 Vol.22 No.1
This study makes experimental specimen to examine durability of concrete and structural characteristics of reinforced concrete beams such as shear behavior and destruction according to contents of shells in concrete using sea sand containing river sand and shells (8%, 10%, 20%, 30% and 40%) and age. evaluates its load, deflection, crack and destruction from load increase and ductility capacity and aims a t supplying the data for applying it to actual structures. The results obtained through material test of concrete and static experiment of members using sea sand containing river sand and shells are as follows; 1. As a result of strength test by shell contents, it is found that compressive strength of specimen using sea sand containing 8% of shells is highest and the more shell contents are, its compressive strength is reduced. 2. The compressive-strength of the specimen used sea sand contained shell by 8% was decreased by 7.8% in the specimen of aged 28 days and 4% in one of aged 365 days compared with the river sand one. 3. In the destruction aspect of shear experiment, the early crack was load 4.94∼21.8lkgf/㎠, yield load 26.17∼37.95kgf/㎠, maximum load 37.95∼53.42 kgf/㎠. 4. In shear test of reinforced concrete beam, it is found that specimen using sea sand containing shells has lower ductility capacity than the specimen using river sand and the more shell contents are, crack is occurred in low load and velocity of deflection of members is faster.
先加力 후 補修-補强한 鐵筋콘크리트 壓縮部材의 構造特性에 관한 實驗的 硏究
신용석,최진석,김판선,조철희,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
This study examined the Stress and structural characteristics of reinforced concrete compressive member repair and strengthening by CFS and GFS after pre-loading. The following results were obtained. The results of compressive testing by the kind of fiber suggested that: In CFS, Specimen increased by about 26.9% and strengthening after pre-loading, by about 111.8%, compared with after strengthening, In GFS, Specimen increased by about 69.0% and repaired and models after pre-loading, by about 76.7%, compared with after strengthening. In the compressive testing, strengthen with CFS-Specimen showed a brittle fracture and strengthen with GFS-Specimen represented ductile fracture. More increasing in stress of Specimen, and repair and Strengthening specimen after pre-loading than loading specimen after strengthening suggested the strengthen effect of fiber.
최병근(Byung geun Cheoi),최경주(Kyung joo Cheoi) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1C
본 논문에서는 동영상을 대상으로 하는 기존의 시각주의 성능을 향상시킨 새로운 시스템에 대하여 설명한다. 제안하는 시스템은 기존의 시스템이 가지고 있던 한계점인 서로 반대되는 특징을 가지는 색상에서 하나의 특징만을 고정적으로 선택하던 것을 극복하여, 서로 반대되는 특징 중 현저함이 더 높은 색상 특징을 선택하여 입력 들어오는 영상에 적응적인 현저함 추출을 하였다. 또한 시간 현저함 정보를 추가적으로 고려할 수 있도록 하여 동영상에 대한 처리도 가능하도록 하였고, 성능 평가 시 인간을 대상으로 한 설문 조사 실험을 추가하여 보다 인간의 시각 인식과 유사한 시스템임을 증명하였다.
Detecting Object of Interest from a Noisy Image Using Human Visual Attention
Cheoi Kyung-Joo The Korea Contents Association 2006 International Journal of Contents Vol.2 No.1
This paper describes a new mechanism of detecting object of interest from a noisy image, without using any a-priori knowledge about the target. It employs a parallel set of filters inspired upon biological findings of mammalian vision. In our proposed system, several basic features are extracted directly from original input visual stimuli, and these features are integrated based on their local competitive relations and statistical information. Through integration process, unnecessary features for detecting the target are spontaneously decreased, while useful features are enhanced. Experiments have been performed on a set of computer generated and real images corrupted with noise.
UNIFORMLY FUZZY CONTINUOUS ON THE FUZZY REAL LINE
Cheoi, Dae Ho,Kim, Tae Soo,Kim, Mi Hye 충청수학회 1999 충청수학회지 Vol.12 No.1
In this paper, we shall define the usual fuzzy distance between two real fuzzy points, using the usual distance between two points in $\mathbb{R}$. We introduce the fuzzy sequence in the fuzzy real line and the notion of limit of fuzzy sequence in $F_p(\mathbb{R})$, and obtain uniformly fuzzy continuous in $F_p(\mathbb{R})$.