• Proceedings of the Korean Nuclear Society Conference
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• 2001.10a
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• pp.270.1-270
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• 2001

• Journal of the Korean Geosynthetics Society
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• v.17 no.1
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• pp.1-10
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• 2018

We conducted research to develop a solidification agent for the ground surface reinforcement method in which activator is fused by recycling pig iron slag, which is a byproduct generated in the steel making process. The purpose of this research is to solve the problems of surface soil by improving the strength and durability of foundation soil such as soil loss, settlement, sinkhole, etc. by recycling pig iron slag from disused or landfilled steelworks. For this purpose, the possibility of using pig iron slag as a solidification soil was evaluated by the compressive strength, elution test of harmful materials, permeability coefficient test. As a result of the compressive strength test, the values of the strength of the curing 28 days of the solidified soil having the solidification agent mixing ratio of 12% were found to be 0.93, 0.96 and 1.3 MPa, respectively, satisfying the required strength value of 1 MPa, In the case of permeability coefficients, the minimum values were $4.1{\times}10^{-8}$, $7.0{\times}10^{-7}$, and $1.7{\times}10^{-7}cm/sec$, respectively, at the solidification agent mixing rate of 12%. In addition, as a result of the elution test of harmful materials, a small amount was detected in the item of hexavalent chromium but satisfied the inclusion criteria, and in the remaining items, heavy metals were not eluted.

• Clean Technology
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• v.24 no.4
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• pp.315-322
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• 2018

Industrial use of waste oyster shells is limited because of requiring excessive energy for converting natural oyster shells in the form of calcium carbonate ($CaCO_3$) into calcium oxide (CaO) for this purpose. This study aimed to develop energy-saving process for producing solidifying agent using waste oyster shells for backfill materials. It was suggested that oyster shells were converted to calcium sulfates which were mixed with sodium hydroxide solution and red clay, forming solid specimen. The optimal concentrations of sulfuric acid for sulfation of oyster shell and sodium hydroxide to generate calcium hydroxide ($Ca(OH)_2$), were determined. Unconfined compressive strength of solid specimen increased with increasing the content of solidifying agent while it increased also with increasing ratio of natural oyster shells to coal ash. The result clearly demonstrates that solidifying agent consisting of sulfuric acid-treated oyster shell, coal ash, and sodium hydroxide solution, can be effectively utilized for preparing backfill materials using natural oyster shell and coal ash. Sulfuric acid-treated oyster shell-based solidifying agent has not been previously developed and will contribute to broaden industrial application of waste oyster shells.

• Tunnel and Underground Space
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• v.22 no.2
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• pp.157-161
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• 2012

ZnO-98% and $Ga_2O_3$-2% powder were consolidated by shock compaction technique, which uses a high performance explosive. The microstructural and electrical characteristics of $ZnOGa_2O_3$ compact with density of 97% and hardness of 220~250 $H_v$ were investigated using SEM (Scanning Electron Microscope) and X-ray diffraction analysis, respectively. In the microstructures of the compact, there were no visible cracks at most of the surface areas, and interparticle bonding between powder particles was confirmed. The broadened peaks were detected due to deformation of crystallited size and high electric resistances were confirmed due to increased grains because of shock energy with a high pressure and high velocity.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2010.05a
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• pp.115-116
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• 2010

방사성농축폐액처리를 위한 Polymer-Modified-portlandcement 고화체는 Polymer 및 시멘트, 물을 혼합매질로 제조되며 농축폐액처리를 위해 Emulsion Polymer를 사용하였으며 PMC 고화체의 물성을 평가하기위한 고화체의 제조에서 이들 매질의 최적혼합비를 찾기 위해 Polymer 및 물, 시멘트의 혼합비를 1/1/2,1/2/4,1/3/9 등 혼합비에 따른 시편 및 Polymer 첨가량의 증가에 따라 함유비를 달리하는 시편을 제조하여 경화시간별 압축강도를 측정하였으며 매질의 최적혼합비 및 폴리머의 투입비를 구하고자하였다. 특성평가시험을 위한 시편으로는 직경 50, 높이 100mm(L/D=2) 인시편을 제조하여 압축강도를 측정하였으며 폴리머와 시멘트의 결합상태를 확인하기위해 SEM사진을 통한 미세구조를 관찰하였으며 시험결과 P/W/C의비가 1/3/9인 혼합비시편의 압축강도가 $343.36Kg_f/cm^2$로 가장 높았으며 폴리머의 함유량을 달리한 시험에서는 7%폴리머 함유시편은 $397.24Kg_f/cm^2$, 20% 폴리머함유시편은 $175.36Kg_f/cm^2$으로 폴리머의 함유량이 7~15% 이내의 폴리머함유고화체가 적합한 것으로 판단되었으며 폴리머의 투입양이 증가할수록 압축강도가 감소하였으며 경화시간도 최소4주이상 되어야하는 것으로 판단되었다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.1 no.1
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• pp.41-46
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• 2003

To understand the long-term leach behavior of a borosilicate Waste glass in a repository, the leaching experiment with three kinds of simulated borosilicate waste glasses has been carried out since the middle of 1997. The five years results indicate that a boron would be applied as an indicator of a long-term leaching of their borosilicate waste glasses and that their long-term leach rates have a tendency to be close to about 0.03g/$m^2$-day even though their compositions and their ratios of the surface area to the volume of leachate are different.

• Information and Communications Magazine
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• v.30 no.4
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• pp.38-44
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• 2013

최근 IT 관련된 소프트웨어 기술 및 컴퓨터 자원의 가상화 기술이 발전됨에 따라 사용자가 네트워크나 인터넷으로부터 소프트웨어를 서비스 형태로 이용하는 소프트웨어 서비스 분야의 시장 규모가 급속도로 확대되고 있다. 이와 더불어 다양한 분야에서 고해상도에서 3D렌더링을 필요로 하는 고화질 어플리케이션에 대한 소프트웨어 서비스의 요구도 증대되고 있다. 본고에서는 최근 이슈가 되고 있는 고화질 소프트웨어 서비스의 핵심 기술 동향 및 전망을 기술하고자 한다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.14 no.4
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• pp.319-321
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• 2002

Recently, the injection of cement stabilizer is used as one of ways to improve soft sea-bottom. However, this method makes an argument with $Cr^{6+}$subject to emerge to the seawater from the cement stabilizer. To investigate the amount of$Cr^{6+}$field measurements were carried out in Ochun harbor of Chunsoo Bay. The analysis shows the amount of $Cr^{6+}$in the seawater met the demand of environmental criterion.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.443-448
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• 2006

본 논문에서는 고화질 협업 환경에서 다수의 고화질 영상들을 처리하기 위한 타일드 디스플레이(tiled display)기반의 확장성있는 디스플레이 구조를 제안한다. 제안하는 구조는 대형 고화질 디스플레이를 제어하기 위한 기술과 다수의 고화질 영상을 제한된 시스템 자원을 이용하여 효율적으로 디스플레이 하기위한 기술을 다룬다. 제안된 시스템은 영상의 획득/디코딩/디스플레이와 같은 가시화를 담당하는 Scalable Visualization Consumer 로 명명된 확장형 가시화 응용을 포함한다. 제안된 기법들을 토대로 구현된 확장형 가시화 시스템의 성능을 평가하고자 한다.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.10a
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• pp.355-359
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• 2005

본 연구에서는 OPC 및 hauyne 클링커의 비산재에 대한 고화특성을 검토하였다. 비산재에 대해 OPC 및 OPC에 hauyne 클링커를 20%까지 대체하였을 때의 압축강도, 길이변화율, 중금속 용출량 등을 조사하였다. 결과로서, hauyne 클링커의 첨가량에 따라 고화체의 압축 강도가 증가하였다. hauyne 클링커의 첨가량은 10%내외가 적합하였으며, 그 이상에서는 길이변화율이 증가하며 팽창하였다. 고화체의 중금속 용출시험결과 모든 배합조건에서 환경기준치이하의 값을 나타내었다.