• Fire Science and Engineering
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• v.25 no.3
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• pp.20-27
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• 2011

This paper studied combustion characteristics of the sponge type sound-absorbing materials extensively used on building interior. To estimate of the combustion characteristics, we carried out combustion experiment of general type and incombustibility type sound-absorbing materials. And then to evaluate the suitability of the sponge type sound-absorbing materials, we measured heat release rate (HRR) and smoke density (Ds) of the sound-absorbing materials using by a cone-calorimeter. From the combustion experimental results, general type sound-absorbing materials were rapid burned simultaneously with ignition and the incombustibility type sound-absorbing materials had all gone out simultaneously with ignition. Measured results of HRR and Ds were not satisfied KS F ISO 5660-1 and IMO FTP Code, form the results, the sponge type sound-absorbing materials were ill-suited for using building interior.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.203-206
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• 2006

Ada는 객체지향 특성과 소프트웨어 모듈화 및 일반화 메커니즘을 통해 프로그래밍 언어 차원에서 소프트웨어의 재사용성을 제공하고 있다. 그러나 특정 언어 자체를 이용하는 것만으로 소프트웨어의 재사용이 확보되지는 않으며 설계자가 컴포넌트간의 유기적인 관계를 파악하고 재사용을 통해 얻을 수 있는 장.단점을 판단할 수 있어야 한다. 본 논문은 재사용 가능한 소프트웨어 객체와 인터페이스를 식별하고 재사용 모듈의 설계에 필요한 요소들을 파악함과 동시에 소프트웨어 설계 시 적용할 수 있는 코딩 패턴을 제시한다. 또한 이들을 보다 효율적인 설계도구인 Statemate에서 재사용 모듈로 활용할 수 있도록 기존 generic chart의 한계를 고려한 확장 개념의 재사용 모듈을 작성한다.

• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.3
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• pp.269-275
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• 2022

In this study, the setting time and compressive strength of cement paste composites applied with nano-micro pozzolanic binders were experimental analyzed. The pozzolanic binder was reduced initial and final setting time and the compressive strength was increased. Micro silica was effective in decrease the initial setting and final setting time and impressing the compressive strength. When two or more cement binders were used, the using of silica fume and a small amount of nano silica at reduced the setting time to 62-64 % to OPC cement and the compressive strength was increased to 117 %. A small amount of mixing the nano silica was effect to pore filling and pozzolanic activation. However, the addition of a chemical admixture should be considered when mixing table design because pozzolanic binders high specific surface area causes a decrease in cement composites flow.

• Journal of the Korean GEO-environmental Society
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• v.12 no.9
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• pp.71-78
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• 2011

Cement treating technique, such as deep mixing method, has been used widely to stabilize the dredged clayey soil for many years. Despite of its effectiveness in treating soil by cement, several efforts have also been made to try to reduce the side effect of the cement that used to stabilize the dredged clay. However, authors considered that more detailed study on the physical and mechanical properties of lean-mixed soil-cement has been required to establish the design procedure to apply the practical problems. Therefore, in this study, the curing time and mixing ratio was used as key parameters to estimate the physical and mechanical properties including long-term behavior. The unconfined strength of lean-mixed soil-cement increase continuously during curing period, 270 days, while increasing rate becomes low in ordinary cement-treated dredged clay. We also concluded that cement-treated dredging clay shows apparent quasi overconsolidation behavior even in low cement proportion. By this study, fundamental approach was carried out for effective reuse of very soft dredged clayey soil both in mechanical and environmental aspect. It can be also expected that this study can propose a basic design data to use the lean-mixed soil cement.

• The Transactions of the Korea Information Processing Society
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• v.5 no.6
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• pp.1377-1389
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• 1998

Firm real time transactions on firm real-time database systems arc discarded when they miss their deadlines. as there is no value to completing them after they miss their deadlines. Several approaches that exploit the semantics of firm deadlines to improve the performance of firm real-time database systems have been proposed in the literature. They are based Oil locking or optimistic concurrency controL The performance comparisons of the two approaches differ with svstems load. In this paper. we develop a novel policy termed stop/resume deferred restart policy, and a concurrency control algorithm based on the policy (temled Altcmativc Version Concurrency Contro). When conflicts : due to Pliority) occur our algmithm maintains the immediately restarted VerSlOn as wpll as the stopped version of a transaction in order to use one of the two to meet the firm deadline. At last we show that our policy generates scrializable schedules and show tbat our algorithm performs better than the traditionally used method for wide ranges of the system load for firm deadline transaction.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10a
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• pp.461-464
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• 2001

소프트웨어 위기를 극복하기 위해 재사용성, 유지보수성, 적시성 관점에서 컴포넌트 기반 방법론이 크게 각광받고 있다. 또한 기존의 코드를 이용하여 컴포넌트를 만드는 방법, 컴포넌트를 이용하여 새로운 컴포넌트를 만드는 방법 등 여러 컴포넌트 기술이 개발되고 있다. 본 논문에서는 컴포넌트의 개발 시간을 단축하기 위한 컴포넌트 생성 지원 도구 개발에 대해 간단히 설명한 후 설계와 구현을 동시에 할 수 있는 컴포넌트 클래스 다이어그램에 대해 기술한다. 설계와 구현을 동시에 지원함으로서 개발기간을 크게 단축할 수 있고 설계와 구현의 동일성을 보장한다. 또한 컴포넌트 클래스 다이어그램은 EJB 컴포넌트에 전개까지 지원한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.11-14
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• 2012

최근 고도성장에 발맞추어 건축물의 에너지 효율등급 인증제를 실시하면서 외단열시스템(EIFS) 외장재 사용이 늘어나고 있으며, 건물의 외관상의 디자인을 중시하게 됨으로써 다양한 소재의 외장재를 적용하고 있다. 그러나 건축물의 내부 또는 외부에서 발생된 화재가 외장재를 통해 건물 전체로 확산되는 이른바 동시다발성 화재가 많이 발생하고 있다. 2010년 부산해운대의 고층건물에서 외장재를 통해 연소 확산된 화재가 발생하면서 건축물의 외장재의 관한 규제가 절실해졌다. 현재 국내 건축법과 소방법에는 내화구조 및 내장재에 관한 기준은 있지만 외장재에 관한 기준은 마련되어 있지 않다. 이에 현재 건축물 외장재의 법제화를 하기 위해서 많은 연구와 실험이 진행 중에 있다. 이런 노력에 앞서 현재 상용되는 외장재의 종류를 살펴보고 국내 건축물에 적용된 외장재에 대해서 알아보는 것이 이번 연구의 목적이다.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.361-364
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• 2008

This study was performed to estimate the anchorage behavior for Bi Prestressed Concrete Girder(Bicon girder) which could introduce effectively prestressed forces into concrete girders. A bicon girder is manufactured by means of introducing pure bending moment that prestress simultaneously the compressive member(steel bar) and the tensile member(steel tendon). Therefore, the steel bar and the steel tendon must be unified in both ends and compressive and tensile force be offset. Anchorage dimension of 6 test specimens was designed under PTI specification which defined maximum stress and deformation to estimate structural behavior. Test results showed that the stress and the deformation of anchorage were within limits if the steel bar behaviored elastically.

• Analytical Science and Technology
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• v.21 no.3
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• pp.167-173
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• 2008

In order to solve the reproduction problem of PCB, we carried out poly chlorinated biphenyl (PCB) removal at low temperature (< $220^{\circ}C$), which could not take place reproduction of PCB by over 90% on catalyst. We coated catalyst to commercial bag filter for simultaneous removal of PCB and particle. It was found that PCB could be not reproducible due to it's decomposition of benzene ring. The coating method of spray type was more useful than that of precipitation one. PCB removal conversion was highest on the Pt-Co catalyzed bag filter. The data of this study can be well used in order to remove PCB and particle simultaneously for incinerator process by substituting commercial bag filter to catalyzed bag filter.

• The KIPS Transactions:PartB
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• v.8B no.1
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• pp.59-65
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• 2001

워터쉐드 변환은 영상분할을 위한 강력한 도굴로 이용되고 있으나, 일반적으로 다수의 국부적 최소점들로 인한 과분할 현상을 초래하여 이를 해결하기 위한 많은 방법들이 연구되어지고 있다. 본 논문에서는 동시정보행렬을 분석하여 비 관련 최소점들을 억제함과 동시에 의미 있는 화소 집합들만을 마커로 선택하고 레이블링하는 자동마커 추출단계와 각 마커로부터 범랑과정 및 재 레이블링에 의한 워터쉐드 추출단계를 수행하여 영상을 분할하는 자동마커 기반 워터쉐드 영상분할 알고리즘을 제안한다. 제안한 알고리즘이 과분할 정도로 현격히 줄이는 것을 보이기 위해 일반영상과 텍스쳐 특성이 강한 ICQ(Indo Cyanine Green) 망막영상에 적용하여 실험 분석하였다.