유리纖維 補强 콘크리트 流動 特性에 관한 硏究

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.

슬래그골재와 플라이애시를 이용한 강섬유 보강 포장용 투수콘크리트의 역학적 특성에 관한 실험적 연구

박승범,이병재,이준,장영일 한국도로학회 2007 한국도로학회논문집 Vol.9 No.4

This study evaluates the mechanical properties of steel fiber reinforced porous concrete for pavement according to content of slag aggregate and fly ash to elicit the presentation of data and the way to enhance its function for the practical field application of porous concrete as a material of pavement. As a result, void ratio and permeability coefficient of porous concrete for pavement increased a little as mixing rate of slag aggregates increased. Void ratio and permeability coefficient increased a lot as mixing rate of fly ash decreased. As fly ash was mixed, national regulation of permeable concrete for pavement(8% and 0.1 cm/sec) was met. Compressive strength and flexural strength decreased as mixing rate of slag aggregates increased, but they increased a lot as mixing rate of fly ash increased. Even when slag aggregates were mixed 50% with 5% fly ash mixed, national regulation of pavement concrete(18MPa and 4.5MPa) was met. In addition, compared to non-mixture, flexural strength increased about 22.8% when 0.75vol.% of steel fiber was added. Regarding sliding resistance, BPN increased as mixing rate of slag aggregates increased. But BPN decreased as fly ash was mixed. Compared to crushed stone aggregates, abrasion resistance and freeze-thaw resistance decreased as mixing rate of slag aggregates increased. When fly ash was mixed, abrasion resistance and freeze-thaw resistance improved remarkably. Compared to non-mixture, 10% mixture of fly ash improved abrasion resistance and freeze-thaw resistance about 5.6% and 14.3 respectively.

섬유보강 콘크리트의 특성과 최근의 기술(기3)

박승범,Park, Seung-Beom 한국레미콘공업협회 1991 레미콘 Vol.3 No.-

미래의 바람직한 콘크리트 교육 방향

박승범,김성수 한국콘크리트학회 2002 콘크리트학회지 Vol.14 No.1

실리카퓸 및 강섬유를 이용한 포장용 포러스콘크리트의 품질특성에 관한 연구

박승범,서대석,윤의식,이준 한국도로학회 2005 한국도로학회논문집 Vol.7 No.3

This study evaluates the physicalmechanical properties, durability and sound absorbtion of porous concrete for pavement according to content of silica fume and steel fiber to elicit the presentation of data and the way to enhance its function for the practical field application of porous concrete as a material of pavement. The results of the test indicate that in every condition, the void ratio and the coefficient of water permeability of porous concrete for pavement satisfy both the domestic standards and proposition values. Among the properties of strength, the compressive strength satisfies the standards in the specification of Korea National Housing Corporation as for every factor of mixture but in the case of the flexural strength, more than 0.6vol.% of steel fiber satisfied the Japan Concrete Institute proposition values. The mixture of silica fume and steel fiber presents the excellent intensity, though. The case when silica fume and steel fiber are used simultaneously presents the strongest durability because the durability shows the similar tendency to the dynamic characteristics. The case when 10wt.% of silica fume and 0.6vol.% of steel fiber are used at the same time shows that the loss rate of mass by Cantabro test became 27% better and freeze-thaw resistance became 60% better. As for the characteristics of sound absorption of porous concrete for pavement, Noise Reduction Coefficient is 0.48 to prove that it possesses almost 50% sound absorption. 본 연구는 도로용 포장재로서 포러스콘크리트의 실질적인 현장적용을 위한 자료제시와 성능향상 방안을 도출하기 위하여 실리카퓸과 강섬유 혼입률에 따른 포장용 포러스콘크리트의 물리․역학적 특성, 내구성 및 흡음특성을 평가하였다. 시험결과, 모든 시험조건에서 포장용 포러스콘크리트의 공극률과 투수계수는 국내외 기준치 및 제안값을 만족시키는 것으로 나타났고, 강도특성의 경우 압축강도는 대한주택공사 도로기준의 기준치를 모든 배합요인에서 만족시키는 것으로 나타났으나 휨강도의 경우에는 강섬유 혼입률 0.6vol.% 이상에서 일본콘크리트공학협회 제안값을 만족시키는 것으로 나타났으며, 실리카퓸과 강섬유를 동시에 혼입한 경우가 우수한 강도특성을 나타냈다. 또한 내구성은 역학적 특성과 유사한 경향성을 나타내 실리카퓸과 강섬유를 동시에 사용한 경우가 가장 우수한 내구성능을 나타냈으며, 실리카퓸 10wt.%와 강섬유 0.6vol.%를 함께 사용한 경우 Plain의 경우에 비해 골재비산저항성은 27%정도, 동결융해저항성은 약 60%정도 개선되는 것으로 나타났다. 또한 포장용 포러스콘크리트의 흡음특성은 소음저감계수가 0.48로 나타나 50%에 가까운 흡음성능을 발휘하는 것을 확인할 수 있었다.

폴리이미드 기판 위에 RF 마그네트론 스퍼터링 공정으로 증착된 ZnO:Ga 박막의 특성

박승범,김정연,김병국,임종엽,여인환,안상기,권순용,박재환,임동건,Park, Seung-Beum,Kim, Jeong-Yeon,Kim, Byeong-Guk,Lim, Jong-Youb,Yeo, In-Hwan,Ahn, Sang-Ki,Kweon, Soon-Yong,Park, Jae-Hwan,Lim, Dong-Gun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.5

The effects of $O_2$ plasma pretreatment on the properties of Ga-doped ZnO films on polyimide substrate were studied. GZO films were fabricated by RF magnetron sputtering process. To improve surface energy and adhesion between the polyimide substrate and the GZO film, $O_2$ plasma pretreatment process was used prior to GZO sputtering. As the RF power and the treatment time increased, the crystallinity increased and the contact angle decreased significantly. When the RF power was 100 W and the treatment time was 120 sec, the resistivity of GZO films on the polyimide substrate was $1.90{\times}10^{-3}{\Omega}-cm$.

UCI 상호참조에 기반한 참조연계시스템의 구현

박승범(Sungbum Park),이상원(Sangwon Lee) 한국IT서비스학회 2013 한국IT서비스학회지 Vol.12 No.1

This paper describes Cross reference services in Knowledge contents based on UCI. Cross references are effective features that can increase the value of the contents. Knowledge contents include academic papers. research reports. archives. historical and cultural heritage, and professional databases. Cross references are consists of reference-to and cited-by links which can be made by reference list in article. Some of cross reference services provided are considered. We designed cross reference services for knowledge contents in Korea and prototype services are provided. The reference linking service in the area of national R&D will enable the linking of heterogeneous information produced at different sources.

도시공원녹지의 입지별 토양특성이 곰솔의 형성층 전기저항에 미치는 영향

박승범 ( Seung Burm Park ),남정칠 ( Jung Chil Nam ),김석규 ( Seok Kyu Kim ) 한국환경복원기술학회 2006 한국환경복원기술학회지 Vol.9 No.6

Big Data-oriented Analysis on Issues of the Hyper-connected Society

박승범,이상원 국제e-비즈니스학회 2015 e-비즈니스 연구 Vol.16 No.5

Since the present point is the dawning of hyper-connection, we should research on the future in order to deduct issues related to technology and economy in the hyper-connected society, develop new industries, create jobs, and set up a method to increase productivity, efficiency or creativity. The future researches to be applied to national policies need to deduct future issues and agendas that reflect future-oriented demands as well as core keywords through monitoring hopeful technology trends. With this background, we will survey on hyper-connected society in the future on the basis of quantitative data analysis and explore ICT keywords which claim our attention in the future. And then, we will choose core issues on the basis of ICT and their strategies so as to realize hyper-connected Korea society. Our researches are as follows; 1) searching for and collecting Web sites, documents, and data related to hyper-connection, 2) deducting core terms of hyper-connected future society through frequency analysis and topic analysis, and 3) setting up major strategy for each future issue through social network analysis.

7세기 전반기 新羅 危機意識의 실상과 皇龍寺9층木塔

박승범(Park, Seung-bum) 신라사학회 2014 新羅史學報 Vol.0 No.30

皇龍寺9층 木塔에 대한 기존 인식은 7세기 들어 심화된 국가적 위기에 처한 신라가 이를 타개하고, 신라 중심적 천하관을 더하여 건립하였다는 것이다. 하지만 건탑이 논의되었던 643년까지도 대야성의 함락을 제외하면 국가적 위기의식을 초래할 만한 상황은 없었다. 위기의 실상은 당대 신라사회를 주도한 사륜계-금관가야계의 정치적 실각의 가능성이었다. 황룡사 9층탑은 분명하고 실제적인 실각 위기에 처한 舍輪系와 金官伽倻系등 신귀족세력의 국면전환을 위해 세워진 것이다. 위기 극복을 위해 신귀족세력의 중심인물인 용춘이 건탑과정을 통해 자신들의 위기를 신라 전체의 위기로 전환시킨 것이다. 그 토대 위에서 신라는 정치적 군사적 안정을 도모할 수 있었고, 김춘추의 대외 외교전을 위한 발판을 마련할 수 있게 되었다. 100여년에 걸쳐 지속된 항시적 전쟁으로 고통받았던 신라의 일반 백성들은 자신들에게 찾아온 평화의 근원적 원인을 황룡사탑에서 찾았다. 심오하고 이해하기 힘든 언사로 이루어진 경전과 佛法행사는 자신들에게 익숙한 전통적 신앙체계의 연장선에서 이해되었다. 이같은 불교이해방식에 따라 황룡사탑의 연기설화를 백성 자신들의 언어로 창조하였다. It has been recognized by the existing research about that the nine-story wooden stupa of Hwangryongsa Temple(皇龍寺) that the stupa was built with a main purpose, what was to establish authority of the ‘queen’ Sunduk who had not it overcom a national crises at the 7<SUP>th</SUP> century adding ‘unify the three hans(一統三韓)’ and The worldview of Silla. But till 643, when the monk Jajang(慈藏) recommanded to build the nine-story wooden stupa in Hwangryongsa Temple, there were not circumstance incurring crises except fall of The Daeyasung-castle(大耶城) in 641. The crises was base on insulting remarks by Tangtaejong(唐太宗), and fall of The Daeyasung-castle was able to steer Saryungye-lineage(舍輪系) and Kumkwankaya-lineage(金官伽倻系) toward political downfall. According to Sarira Case of stupa, in 643 Jajang recommanded to build The nine-story wooden stupa of Hwangryongsa Temple. And after 2years of preparation, in 645 Major Pillar was build, in 646 the stupa was completion. The building nine-story wooden stupa was a measure of overcom Saryun-Kumkwankaya clique own crises. It’s mean that the clique(especially the leader Yongchoon(龍春) own crises was switched into the whole Silla’s crises. On the basis of this condition, Silla had get a more favorable position than Backje had. And political-millitary stablility was a cornerstone of diplomatic tactics Kimchoonchoo(金春秋) carry forward. After the unification of the Three Kingdoms, The people of Silla who had throwed into continuation of the war for 100 years regarded nine-story wooden stupa as a cause of abrupt peace. The people of Silla accepted esoteric, indigestible bible and Buddhist ceremony by a prepheticinterpretation-a familiar and traditional way-, also created legendary narratives about the nine-story wooden stupa Construction with language of their style.