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효과적인 내용기반 영상 검색을 위한 사용자의 각 시각 특징에 대한 민감도 분석 및 적용에 관한 연구
노동현(Dong-hyun No),양현승(Hyun-Seung Yang) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1B
대부분의 내용기반 영상 검색 시스템들은 시각 특징들에 기반한 영상간의 유사도를 이용해서 영상을 검색한다. 일반적으로 영상간의 유사도는 사람들의 주관에 의존적이다. 그러므로 사용자가 직관적인 영상 검색의 성능을 높이기 위해서 각각의 사용자가 느끼는 영상간의 유사도를 고려할 필요가 있다. 본 논문에서는 검색 결과에 대한 사용자의 적절도 피드백을 이용해서 각 시각 특징에 대한 사용자의 상대적인 민감도를 분석하고, 이를 검색에 적용하는 방법을 제안한다. 본 논문에서는 제안한 방법을 적용하여 Hue, Saturation, Intensity 등의 시각 특정에 기반한 자연 경관 영상 검색 시스템의 프로토타입을 설계하고 구현하였다.
석고 및 미분시멘트에 의한 고로슬래그 미분말 치환 시멘트 모르타르의 초기강도 향상에 관한 기초적 연구
한천구,노동현,Han, Cheon-Goo,No, Dong-Hyun 한국건설순환자원학회 2009 한국건설순환자원학회지 Vol.4 No.3
본 연구에서는 고로슬래그 미분말(이하 BS)사용 모르타르의 초기강도가 저하하는 문제점을 해결하고자 BS 20%치환 시멘트 모르타르에 자극제로 석고(이하 CS)와 고분말도의 미분시멘트(이하 FC)를 치환 사용한 경우의 기초적 물성을 검토한 것으로, 그 결과를 요약하면 다음과 같다. 먼저, 굳지않은 모르타르의 특성으로 유동성은 BS 치환율이 증가할수록 감소하였고, BS 20%에 CS를 치환한 경우는 치환율에 관계없이 큰 영향을 미치지 않은 것으로 나타났으며, FC를 치환한 경우는 치환율이 증가할수록 감소하는 것으로 나타났다. 압축강도는 BS 치환율이 증가할수록 초기재령에서 강도가 저하하는 것으로 나타났고, 재령 28일에서는 잠재수경성 반응에 기인하여 약간 증가하는 것으로 나타났다. BS 20 % 치환 모르타르의 초기 압축 및 휨 강도향상에 대하여 CS를 치환한 경우는 치환율이 증가함에 따라 초기재령에서 미소하게 증가하는 것으로 나타났고, FC를 치환한 경우는 치환율이 증가할수록 초기 및 28일 재령에서 강도가 크게 증가하는 것으로 나타났다. 종합적으로 BS 20% 치환 모르타르의 초기 강도 저하 문제의 해결로서 CS의 치환은 효과가 적고, FC 25%를 치환하여 사용하게 되면 OPC만을 사용한 Plain과 유사한 것으로 나타나 양호한 품질의 향상을 기대할 수 있을 것으로 분석된다. The purpose of the study was to examine basic property at the time of applying cast ('CS' below) and high fineness fine particle cement ('FC' below) as a stimulant to 20% substitution cement mortar of ground granulated blast-furnace slag ('BS' below) to settle a problem that early strength of BS mortar is lowered. The results were as follows. First of all, as a characteristic of fresh mortar, liquidity was reduced as much as BS substitution rate was increased. When substituting CS for BS 20%, it didn't have a large effect regardless of substitution rate. When substituting FC, it was reduced as much as substitution was increased. In the event of compressive strength, it was reduced as much as BS substitution was increased in early age. In age 28, it was somewhat increased by reflection of potential hydraulicity. With regard to improvement of early compressive/bending strength of BS 20% substitution mortar, when substituting CS, in early age, they were a little increased as much as addition rate was increased. When substituting FC, in early and 28 age, they were largely increased as much as substitution rate was increased. To settle a problem that early strength of BS 20% substitution mortar was lowered, CS substitution has a little effect and FC 25% substitution was similar to plain with only OPC. Therefore, when substituting FC 25%, it is expected that its quality will be improved.
거푸집 종류별 당류계 음료 흘림량에 따른 콘크리트의 강도 및 표면특성 변화
김종백 ( Kim Jongbaek ),노동현 ( No Dong-hyun ),이건철 ( Lee Gun-cheol ),한민철 ( Han Min-cheol ),윤기원 ( Yoon Gi-won ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
This paper is to investigate the influence of form spilled with saccharic based beverage on surface condition and strength of concrete at placement of concrete. According to results, the amount of attached concrete on surface of the form appears to be large when metal form is applied and in order of coated plywood form and plywood form. For compressive and flexural strength, up to 20g of spilled beverage amount, they show tendencies to increase, while they decrease sharply above 20g of spilled beverage amount. Pore volume of concrete at 3days exhibits increasing tendency due to insufficient hydration product resulting from delayed setting by saccharic ingredient in beverage. However, at 7 days, pore volume shows to be decreased due to further hydration process with elapse of age.
거푸집 종류별 당류계 음료 흘림량에 따른 콘크리트의 강도 및 표면특성 변화
김종백(Kim Jong-Baek),노동현(No Dong-Hyun),이건철(Lee Gun-Cheol),한민철(Han Min-Cheol),윤기원(Yoon Gi-Won),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
This paper is to investigate the influence of form spilled with saccharic based beverage on surface condition and strength of concrete at placement of concrete. According to results, the amount of attached concrete on surface of the form appears to be large when metal form is applied and in order of coated plywood form and plywood form. For compressive and flexural strength, up to 20g of spilled beverage amount, they show tendencies to increase, while they decrease sharply above 20g of spilled beverage amount. Pore volume of concrete at 3days exhibits increasing tendency due to insufficient hydration product resulting from delayed setting by saccharic ingredient in beverage. However, at 7 days, pore volume shows to be decreased due to further hydration process with elapse of age.
등가재령에 의한 미분 시멘트 사용 콘크리트의 강도 증진 해석
한천구(Han Cheon-Goo),한민철(Han Min-Cheol),최성용(Choi Sung-Yong),노동현(No Dong-Hyun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4
This study presents the estimation of the strength developments of the concretes considering the equivalent age using the fine particle cement (FC) which is manufactured by the classification process. Contents and W/B were considered as experimental parameters. The strength considering the equivalent age is gradually increased, and the deviation of the strength according to W/C is increased by increasing becoming low W/C in accordance with the replacement of the fine particle cement. For the estimating Ea considering setting time, the apparent activating energy of the FC is calculated with 27.6~28.9KJ/㏖, which is somewhat similar to that of OPC. By applying Ea based on setting time, improved agreement was obtained. However, it has still deviations in the region of high contents of FC. For this reason, addition of correction factor in existing equivalent age was done to enhance the accuracy of the estimation. By doing this, we can obtain improved results.