• Journal of Conservation Science
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• v.32 no.1
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• pp.21-32
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• 2016

Animal glue is a traditional material used extensively as adhesive and binder in mother-of-pearl, wooden structure, traditional painting, etc. Analysis of animal glue is usually performed with IR(infrared spectroscopy) based on the IR absorption of functional group. But, it has a limitation in confirming animal glue when a sample consists of several materials because of overlapping of the absorption band. Py/GC/MS(pyrolysis/gas chromatography/mass spectrometry) is a useful tool in analyzing the constituent of polymeric materials like animal glue by identifying their pyrolysate with very small amount of sample. In this study, confirmation of animal glue in a Dancheong sample was tried with this method. Characteristic pyrolytic compounds of animal glue and tung oil used in Dancheong were identified. Dancheong sample painted with Noerok as a coloring material, animal glue and tung oil was prepared and it was possible to find characteristic peaks of animal glue after thermal degradation and artificial weathering experiment. From this, we found that animal glue can be detected using py/GC/MS in cultural heritage samples consisting of several materials and in different condition. IR was also tried to analyze Dancheong sample and the results were compared with those of py/GC/MS for the detection of animal glue.

• Journal of Aerospace System Engineering
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• v.14 no.1
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• pp.36-43
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• 2020

The start of satellite thermal design was to predict the worst operating environment through analysis of the thermal environment of the operation orbit. Because the satellites have different types of operating trajectories for their mission, the exposed thermal environment also varies. Thus, it is necessary to analyze in consideration of the orbital conditions, and a design was performed to guarantee thermal stability for the worst case defined through the analysis. The orbital thermal environmental analysis required an understanding of the basic orbit mechanics and the heat exchange relationship between the space environment and satellite. The purpose of this paper was to provide an understanding of the orbital thermal environment analysis by providing basic data on the space thermal environment in the earth-orbit and describing thermal relations that calculate the amount of space heat inflow into satellites. Additionally, an example of a virtual satellite shows the overall process of analyzing the orbital thermal environment during a mission lifetime.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.11
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• pp.1069-1076
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• 2011

All of the satellite components must be operated within the permissible temperature range during the mission in orbit. Therefore, thermal design is performed to develop verified thermal model and to secure thermal stability on the ground. In this study, thermal model correlation was performed to satisfy the criteria of correlation using ground thermal vacuum/thermal balance test results of LEO satellite optical payload. We also secured verified thermal model by controlling operating cycle of flight heaters. In addition, it was confirmed that all components are within the permissible temperature range through conducting orbit environment thermal analysis. We also secured thermal stability of the satellite.

• 대한예방의학회:학술대회논문집
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• 2005.10a
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• pp.461-461
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• 2005

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2010.04a
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• pp.255-260
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• 2010

• 전기의세계
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• v.39 no.12
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• pp.41-56
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• 1990

Fuzzy set의 또 다른 장점은 "학습"을 함으로써 시간에 따라 변하는 환경에 대해서도 적용이 가능하다는데 있다. 학습하는 Fuzzy 인공지능의 필요성은 목표하는 바가 복잡할수록, 그리고 신뢰도가 떨어질수록 그 중요성을 더해간다. 이 Fuzzy System의 학습과정은 특히 "Unsupervised Learning"이라는 목표하에 그 연구열이 점점 더해가고 있다. 수년안에 사람들간에 이러한 대화가 오고갈 것은 명백해진 것 같다.화가 오고갈 것은 명백해진 것 같다.

• Proceedings of the Optical Society of Korea Conference
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• 2005.02a
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• pp.42-43
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• 2005

• Proceedings of the Korean Fiber Society Conference
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• 1998.04a
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• pp.285-290
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• 1998

The purpose of this study is the design of the climate chamber. Experiments was performed in a climate chamber that was running Under Floor Air-Conditioning System(UFAC). The chamber has a diffuser in the middle of the floor, and exhausts on the ceiling, simulating underfloor air conditioning system.

• Magazine of korean Tunnelling and Underground Space Association
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• v.11 no.1
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• pp.96-111
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• 2009

• Magazine of korean Tunnelling and Underground Space Association
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• v.24 no.4
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• pp.9-18
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• 2022