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朴承範,任昌悳,尹義植 忠南大學校 産業技術硏究所 1989 산업기술연구논문집 Vol.4 No.1
Concrete is an excellent structural material, but it has many problems due to brittle behavior, weak resistance in tension, flexibility and toughness. In order to improve these problems, usually fiber reinforced concrete is used. But in the case of GFRC insufficient workability is caused by using glass fiber and there is lack of studying on it. This report of the following concrete of GFRC was experimented by the different W/C, S/A, glass fiber contents and maximum size of Aggregates. The results of this study is as follows; 1) Optimum S/A ratio is 0.6 at the glass fiber contents of from 0.25% to 0.75% in GFRC, but it cannot be obtained optimum S/A ratio at over 0.75. 2) Even though increasing the W/C ratio, we can get more slump, but slump is much more influenced by fiber contents in GFRC rather than increasing the W/C ratio. 3) Workability of GFRC is much more influenced by fiber contents than fiber length. 4) Workability of GFRC is a little improved by the bigger maximum size of aggregates.
高性能 流動化劑를 添加한 시멘트 페이스트의 레오로지 特性에 대한 實驗的 硏究
朴承範,高潤錫 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.1
Recently flowing concrete admixture called superplasticizers have come into common use for the purpose of improving the workability of fresh concrete thus making flowing concrete, and it also used to allow a very high significant water reduction resulting in high-strength concrete, even at low levels of admixture addition. In order to consider the workability of concrete, it is necessary to evaluate the characteristics of fresh concrete. However it is still true that a full understanding of the behaviour of fresh concrete will be attainable only when it can be based on a full understanding of the behaviour of cement paste. In principle the rheological properties of any system should be predictable from a detailed knowledge of its constituents and their interrelationships, but that cannot yet done much more in domestic for ever relatively simple system.
폐유리골재를 사용한 가열 및 상온 아스팔트 혼합물의 품질특성에 관한 연구
박승범,권혁준,서대석,김상혁 충남대학교 산업기술연구소 2002 산업기술연구논문집 Vol.17 No.1
Recently, it has been recognized that industrial by-products must be disposed to bury simultaneously its outbreaking. Also waste glass were faced with similar problem on the point of recycling view, but further more simply disposal was very impossible and it caused severe environmental polluting problem In the whole world, there has been showed very high marked in recyclig rate for waste glass, one of the wastes. Already advanced country attempted for waste glass to introduce to the field of construction, and invested to convert its usage for construction materials. But in our country, there has been few of orts to magnify its usage to construction field except recycling bottles. So in this paper, we dealt with waste glass aggregates its adoption to hot and cold asphalt mixture and examined thin film water immersion test, mixing level test, marshall properties.
WAVE 통신 시스템을 위한 차량 보안 통신 프로토콜의 설계 및 구현
박승범,안재원,김은기,Park, Seung-Peom,Ahn, Jae-Won,Kim, Eun-Gi 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.4
WAVE(Wireless Access in Vehicular Environments) 통신 시스템은 차량 간 무선통신을 가능하게 해주는 환경을 지원한다. 무선통신의 활용이 증가함에 따라 그에 따른 공격 방법도 다양해져, 패킷들은 통신 시 제3자에 의해 변조될 수 있다. 본 논문은 CA(Certificate Authority)와 차량이 통신 과정에서 ECIES(Elliptic Curve Integrated Encryption Scheme)를 이용하여 자신이 적합한 호스트임을 인증 받고, AES(Advanced Encryption Standard) 알고리즘을 이용하여 패킷의 기밀성과 무결성을 보장하는 프로토콜을 제안하였다. The WAVE(Wireless Access in Vehicular Environments) communication system supports wireless communication environments between vehicles. As the utilization of wireless communication has been increased, attack methods have been varied. There is a high risk on packet manipulations conducted by third party. In this paper, we have designed a secure communication protocol between CA and vehicles. Our designed protocol uses a ECIES(Elliptic Curve Integrated Encryption Scheme) for vehicle authentication and AES(Advanced Encryption Standard) algorithm for protecting packet integrity and confidentiality.
유동화 콘크리트의 건조수축 및 크리프 변형특성에 관한 연구
박승범,임창덕 한국전산구조공학회 1988 전산구조공학 Vol.1 No.2
유동화 콘크리트의 건조수축 및 크리프 특성을 검토하기 위하여 유동화제 2종류와 일반감수제 1종류를 사용하여 재하 하중조건(압축강도의 15% 및 30%)별, 양생조건별로 압축강도 및 건조수축을 측정하고 기건상태하의 크리프 및 크리프변형을 측정하여 유동화 콘크리트의 장기 변형특성을 검토하였다. 그 결과, 유동화 콘크리트는 보통 콘크리트에 비하여 재령 28일의 압축강도는 약 22% 증가하였고, 건조수축은 15% 감소하였으며, 크리프변형은 약 11% 감소하였고 28일간의 크리프회복은 보통 콘크리트에 비하여 작음을 알 수 있었다. 따라서 사용목적에 따른 적절한 유동화제의 선택과 적정량의 유동화제 사용은 건조수축 및 크리프변형에 효과적인 것으로 판단된다. This study was carried out to investigate the long-term deformation of superplasticized concrete. Compressive strength, shrinkage, creep and creep recovery of concretes with and without the superplasticizing admixture have been compared for one year. The test results on creep of superplasticized concrete were also compared with three methods of predicting creep; the ACI model, the CEB model and the BP model. According to test results, superplasticized concrete has good results in compressive strength at an age of 28 days of more than 22%, drying-shrinkage cured at air-conditioned storage less than 15%, creep deformation in air conditioned storage and loaded at an age of 28 days to 15% of compressive strength less than 11% of control concrete.