• Conservation Science in Museum
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• v.12
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• pp.77-88
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• 2011

The study investigated conservation and fiber of 66 letters of Sukmyeonghancheob (national treasure No.1629) that the National Cheongju Museum kept. Before treatment, the cover was destroyed and inner paper was stained by water and humidity and destroyed by insects. One volume of King Hyojong was kept at separate frame. The author disassembled book and removed old Baejeobji and inspected paper quality of letter and tested fiber by using C-stain: The author reassembled one volume by including one letter separated after repairing destroyed area of the edge.

• JOURNAL OF ELECTRICAL WORLD
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• s.272
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• pp.73-80
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• 1999

최근 들어 제품의 최종 처분매립지에 대한 어려움과 주변 환경오염 등이 크게 문제시되고 있다. 가정용 전기제품은 동(銅)$\cdot$알루미늄$\cdot$철(鐵)$\cdot$글라스 등 재이용가치가 있는 소재로 구성되어 있으며 이중에는 앞으로 채굴에 한도가 있는 금속류도 포함되어 있다. 원재료 제조과정에서의 에너지 삭감이란 입장에서도 머티어리얼 리사이클이 필히 추진되어야 할 것이다. 사용필 가전제품에서 환경영향물질의 회수와 리사이클효율을 향상시켜 해체작업자의 육체적 부담을 경감시키는 자동화 공정이 아래와 같이 이미 개발되었다. $\cdot$장척물$\cdot$중량물의 반송에 대하여 자동화가 이루어졌다. $\cdot$제품 분해와 부품분리작업을 위한 자동기계가 개발되었다. $\cdot$리사이클 처리에서의 제품품종 및 제조연대의 다양함에 대하여, 제품구조 데이터베이스의 구축과 작업결과의 자동등록이 이루어졌다. $\cdot$작업원의 수작업은 극히 일부로 한정되어 있다. $\cdot$특수작업에 관한 데이터베이스에서 작업요령이 제시된다. $\cdot$실증운전을 통하여 제품구조 데이터베이스는 충분히 축적되었다. $\cdot$형식데이터의 축적에 따라 작업시간 단축효과가 확인되었다. $\cdot$제품구조$\cdot$재료선택에 관한 많은 경험이 축적되었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.23-24
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• 2023

In this study, an easily recyclable separable glued-laminated timber (GLT)-steel beam was developed, and a structural design method was presented. The GLT and steel were mechanically composited using self-tapping screws. The GLT-steel beam was designed to fail in the compression of GLT. The bending moment and load-carrying capacity of the GLT-steel beam were predicted based on composite beam theory and compared with experimental test data. As a result, the GLT-steel beam exhibited ductile behavior, and compression failure of GLT was observed. The screw connection showed no damage while the steel plate was extended. The load-carrying capacity of GLT after failure was similar to the load resistance predicted by the compressive strength of GLT and the tensile strength of steel. This indicates that the ductile behavior of the GLT-steel beam can be safely designed by the tensile strength (yield) of steel.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.30 no.2
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• pp.145-151
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• 2017

As an alternative to conventional explosive methods for demolition of concrete structures and rocks, the use of non-explosive demolition agents can be considered to reduce noise, vibration, and dust emissions during the demolition process. In this study, we conduct finite element analysis for crack initiation and propagation caused by the expansion of non-explosive demolition agents in square concrete structures. The predicted crack patterns are compared with the experimental results in the literature. The minimum values of the required expansion pressure of non-explosive demolition agents are also estimated, which depend upon the arrangement of non-explosive demolition agents and empty holes. Furthermore, we investigate the effect of empty holes on the fragmentation of concrete structures, and discuss the effective arrangement of non-explosive demolition agents and empty holes for fragmentation improvement.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.2 no.4
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• pp.245-251
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• 2004

Soil washing equipment was developed for decontamination of radioactively contaminated soil generated during normal operation or decommissioning and verification experiments were performed. Decontamination effciency above $80{\%}$ was achieved. In case of low radiation level and large particle size, decontamination efficiency was higher. According to the ratio of volume of water to soil quantity, decontamination efficiency was higher in case of high radiation level. Re-decontamination using decontaminated soil was effective in case of small particles. Using soil washing equipment, radioactivity of contaminated soil generated in nuclear power plant can be decreased and volume of soil for disposal can be decreased. And this equipment can be used in decommissioning.

• Cross-Cultural Studies
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• v.21
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• pp.53-86
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• 2010

This paper is focused on splitting of the first Soviet theatre, MKhAT and collapse of Soviet theatre. A close attention has been paid to Art Theatres's circumstances leading to splitting, critical conscience about division between ideal and real theatres and other concrete situation before the verge of collapse. Administrative reform of the Soviet theatre at the period of Perestroika and Glasnost', its results and conflicts, occurred in the process of transition into market system. These are considered under the premise of that the problems of MKhAT were not so different to the other soviet theatres at that time. As it is known that Moscow Art Theatre is a symbol of Russian theatre. And the status of MKhAT as a symbol of Russian theatre had formulated not only the well-known Stanislavsky' system and his legendary performance The Seagull, Three Sisters etc. It was made by party's effort to make MKhAT as the first Soviet theatre and by directors, artists and critics, they had believed and tried to protect idea of MKhAT as the 'battlements' of Soviet theatrical art. One of them is O. Yefremov, a former leader and artistic director from 1970 to 2000. Actually from the periods of Sovremennik Yefremov knew that does not exist the ideal MKhAT, excepting myths, legends and administrative attitudes. Nonetheless he chose the duty of MKhAT's artistic director to construct ideal MKhAT, theatre as the best moral institution, theatre as union based on common belief. It is same motive that he had led split of MKhAT. But split of theatre did not bring the expected results. After spliting MKhAT has become almost collapsed under collapse of USSR and subsequent turmoil at 1990's. And as soviet theatre disappeared into history, Russian theatre became lost its special significance, the super-theatre's idea.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.451-459
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• 2021

The purpose of this study is to evaluate the performance of a solidifying agent for recycling the fine powder separated from the nuclear power plant decommissioned concrete as a solidifying agent(SA) for radioactive waste. In order to evaluate the performance of the solidifying agent, a powder simulating the fine powder of waste concrete separated from the dismantled concrete of a nuclear power plant was produced, and the main variables were the type of binder and the replacement ratio of zeolite. The solidifying agent was evaluated for fluidity performance, compressive strength, and leaching resistance to non-radioactive cesium. The compressive strength of SA increased as the zeolite replacement ratio increased, and the SA containing 5% or more of zeolite showed a compressive strength that was 1.4 to 1.7 times higher than the acceptance criteria. The cesium leaching index of all specimens was 6 or higher, satisfying the acceptance criteria, and the leaching index of SA was 1.47~1.63 times higher than that of OPC. In particular, the average leaching index after 28 days of the 5% zeolite-substituted solidifying agent was 9.15, which was improved by about 6.4% compared to OPC, and it was confirmed that the zeolite was effective in improving the leaching resistance to cesium ions by showing stable performance over the entire period.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.6
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• pp.751-762
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• 2022

Welded head studs are mainly used as shear connectors to bond steel girders and concrete slabs in steel-concrete composite bridges. For welded shear connectors, environmental problems include noise and scattering dust which are generated during the removal of damaged or aged slabs. Therefore, it is necessary to develop demountable shear connectors that can easily replace aged concrete slabs for efficient maintenance and thus for better management of environmental problems and life cycle costs. The buried nut method is commonly studied in relation to bolted shear connectors, but this method is not used in civil structures such as bridges due to low rigidity, low shear resistance, and increased initial slip. In this study, in order to mitigate these problems, a demountable bolted shear connector is proposed in which the buried nut is integrated into the stud column and has a tapered shape at the bottom of an enlarged column shank. To verify the performance of the proposed demountable stud bolts in terms of static shear strength and slip displacement, a horizontal shear test was conducted, with the performance outcomes compared to those of conventional welded studs. It was confirmed that the proposed demountable bolted shear connector is capable of excellent shear performance and that it satisfies the slip displacement and ductility design criteria, meaning that it is feasible as a replacement for existing welding studs.

• Journal of Radiation Protection and Research
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• v.31 no.3
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• pp.123-128
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• 2006

A small radiation detection system is necessary for the direct characterization of alpha/beta-ray contamination inside pipes generated during the decommission of a nuclear facility. In this work, the new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for ${\alpha}/{\beta}$ simultaneous counting was designed as part of a development of a equipment capable of monitoring radiological contamination inside pipes. The optimum counting conditions in dimensions of scintillator and a detection system were experimentally confirmed and a performance of alpha/beta-ray discrimination was evaluated. As a result, optimum conditions of a detector suitable for monitoring radiological contamination inside pipes and a feasibility of application to pipe-inside were confirmed.

• The Journal of the Korea Contents Association
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• v.13 no.9
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• pp.143-154
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• 2013

This study reviewed reorganization of bureaucrats in the beginning of Lee Myung bak's government from the perspective of the relationship between politicians and bureaucrats. In other words, it analyzed the reorganization of central office group of Korean government in 2008 as the relationship between calling to account by politicians and avoiding calling to account by bureaucrats. Conclusively, first, separation or abolition of a certain organization was resulted from calling to account by president (the ruling party). Second, merging organizations was done because president wanted strong control on that agency or he wanted to realize presidential election pledge (policy) through the agency. Third, if an organization was not changed even though it was selected as the target of abolition, it meant that the organization succeeded in defense. As seen from the above cases, it was found that politicians and bureaucrats played a kind of game for reorganization of government organizations. First of all, if politicians succeeded in calling to account, the bureaucratic organization was separated or abolished. If bureaucrats succeeded in self defense, the organization became expanded. Finally, if both parties were even, corresponding organizations would not have changes.