• Journal of the Korean Society of Propulsion Engineers
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• v.21 no.1
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• pp.1-7
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• 2017

As a part of studies to lower the infrared (IR) emissivity from the surface of exhaust nozzle in the turbo jet engine, stainless steel plate was coated with copper particle/meta-aramid resin composites and the IR emissivity of the plate were investigated. Binders of filler particles based on synthetic polymers generally undergo thermal decomposition before $300^{\circ}C$. It was found that the meta aramid resin was thermally stable after the test at $320^{\circ}C$, confirming the excellent thermal stability. Contents of copper particles in the composites were varied from 0 to 70% by volume. It was observed that the copper particle/meta aramid resin composites showed good adhesion after the tests at $320^{\circ}C$. The specimen coated with the composite containing 50 vol% of copper particles showed the lowest IR emissivity, 0.6, at $320^{\circ}C$.

• Journal of the Korea Furniture Society
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• v.23 no.2
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• pp.207-213
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• 2012

It was investigated present condition and enhancement of wooden playground. Wood material is the concept of eco-friendly materials. Wood is the best material which helps children to improve their emotional and physical quality. Recently, the number of wooden playgrounds was reduced but synthetic resin material has greatly increased. It was because of the high construction cost of wooden playground. Therefore, to increase the number of wooden playgrounds, it is the most important to remind people of positive recognition about wood material.

• Microbiology and Biotechnology Letters
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• v.24 no.3
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• pp.327-330
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• 1996

An amino acid antimetabolite named YS-460 was isolated from the culture filtrate of a newly isolated Actinomycetes identified as Streptomyces sp. Fermentation was carried out in the synthetic medium at 30$\circ$C for 5 days. Purification was done by ion exchange resin, active carbon, silica gel column chromatography and obtained 38 mg of pure active substance per liter of the broth. YS-460, an amino acid like substance, has the molecular formula of C$_{7}$H$_{11}$NO$_{3}$- Its structure determined to be furanomycin by spectral analysis. It is active against some bacteria on a chemically defined medium and reversed competitively by L-isoleucine and non-competitively by L-leucine and L-valine.

• Journal of Environmental Science International
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• v.8 no.2
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• pp.183-187
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• 1999

The purpose of this study is providing basic data to control the air pollutants from solid waste incinerator. Incinerating the waste wood, the electrostatic precipitator had the best collection efficiency. The leather incineration had the same collection efficiency as synthetic resin incineration. And the coarse particle collection efficiency was high. As you know in correlation of leather incineration. pollutants produced a from incinerator are mostly fine particles. If the scrubber used only in the process produced a lot of fine particles. It is adequate to use the above control devices, together with high efficiency collector like bag-filter. To select the adequate control devices, it is required to investigate the size distribution before establishing control devices.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1849-1852
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• 2005

An automatic cap-washing machine is developed for rinse and dry of synthetic resin cap which is used in spring water bottle. This machine should be achieved all processes washing and drying, array, transfer automatically. A cap is washed by an ozonized water and pure water first. Next, a cap is dried by a hot wind drying equipment. In this paper, structural and modal analysis for the cap-washing machine is carried out to check the design criterion of the machine. The analysis is carried out by FEM simulation using the commercial software, CATIA V5. And a fictitious mass properties was used for the analysis of the machine. Finally, the machine performance is shown to be satisfactory.

• Journal of the Korean Professional Engineers Association
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• v.15 no.1
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• pp.7-13
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• 1982

The program of safety performance of synthetic resin pipe which is used to the pipe Line for cable protection as an underground Communication is recognized importance gradually. For investigating of these, The Mechanical experiments by each type was carried out From the results, This study compared experimental data with theorical data against soil pressure and traffic pressure which went through laying pipe, and presumed the reasonable laying conditions after calculating total pressure by each laying depth, also grasped material Property of laying pipe and knew impact effect, relation of thickness against strain.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2005.10a
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• pp.59-69
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• 2005

일본의 농림수산성은 ${\ulcorner}$농업용 폐플라스틱${\lrcorner}$으로 호칭하고 있다. 연간배출량은 약 16 만톤에 이르고 있고, 이의 처리내용은 재생 38%, 매립 32%, 소각 11%, 등이다. 재생처리단계는 민간사업자가 기본으로, 처리내용은 일반적으로 PVC가 바닥재로써 쓰이고 PE가 서멀(연료)로써 쓰인다. 그러나 최근에 와서 비닐에 혼합되어 있는 이물질을 완전제거해 일정량의 버진과 배합함으로써 비닐을 반영구적으로 순환해 사용할 수 있는 기술이 개발되어 졌다. 이 싸이클시스템은 21 세기의 절약형사회에 적합한 것으로, 버진제품보다 저가에 공급되어 농업경영의 안정화에도 기여하고 있다. 한번 사용한 농업용 생산자재를 회수해 다시 생산자재로서 활용, 끝없이 순환한다는 개념이 뒷받침하는 이 기술은 향후 환경과 자원의 문제해결이라는 주목할 만한 가치가 있다.

• Journal of the Korean Chemical Society
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• v.4 no.1
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• pp.62-66
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• 1957

With the intention of preparing cation exchangers from the domestic coals, and using these for softening hard water and some other purposes, seven kinds of raw coal were tested and the results are as follows. 1) The following conditions of preparation were given the good results. Reaction time 5 hours Reaction temperature $95^{\circ}$ Concentration of sulfuric acid 98% Amount of sulfuric acid 10 times to the sample (as weight) 2) The raw coals which is rich in fixed carbon and have the fuel ratio 0.8 to 1.0 were suitable, and Kampo lignite has shown the best results. 3) The cation exchangers from coals were able to exchange the cation, both hydrogen and sodium type dynamically and statically, like the synthetic ion exchange resin. The exchange capacities were as follows. Total capacity 1.60 meq/g. Breakthrough capacity 1.30 meq/g. Usable breakthrough capacity 1.20 meq/g National Central Research laboratory

• Journal of the Korean Society for Precision Engineering
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• v.19 no.12
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• pp.142-149
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• 2002

In this paper, the metal forming process is caused of rise of the unit cost of production in increase of the lead-time and cost because of manufacturing final product through a few the number of processes. Flow control complex forming is proposed to put into formulation in order to apply cold forging from conventional approximate similarity theory, and the forming loads of the real material(AISI 1008) can be calculated by put at the new similarity formula the load by plasticine model material experiment through hub clutch. In order to reduce lead-time and cost the technology is used to manufacture with lower die of this product. By the application synthetic resin as the raw material, it is have the merit such short lead-time, low cost, good surface finish etc., as compared with the machine work.

• 전기의세계
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• v.34 no.8
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• pp.476-488
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• 1985

전기공학분야의 여러다른 부분과 같이 전력케이블 분야에서도 수많은 연구와 아울러 특히 19세기후반에 전력케이블의 제작에 성공한 것은 20세기에 들어와서 케이블과 이에 관련된 모든 기술이 빠른 속도로 발달하게된 주원동력이 되었다고 보아도 과언은 아니다. 비록 19세기 후반에 고무(rubber)를 사용하여 케이블 절연 하였지만, 그이후 약 70여년이상을 Impergnated paper(오일복합수지(oil compound resin)나 오일(oil)을 종이에 스며들게한 후 그 종이를 절연재료로 이용함)를 전력케이블 절연재료로 많이 사용하여 왔다. 아울러 OF cable의 제조기술도 향상되어 현재 매우 높은 전압과 상당한 전력용량를 충족시키는 전력케이블로서 발달을 계속하고 있다. 1960년대에 들어서서 extruded polymer material 이 전력케이블의 절연재료로 쓰이게 되었는데 현저하게 주로 쓰이는 재료로 폴리에틸렌인대, 그대로 순수한 상태로 또는 어떤 처리를 하여 쓰기도 한다. 그러나 EPR(ethylene propylene rubber)도 역시 개발중에 있다. Extruded synthetic insulation을 사용한 케이블은 현재 모든 필요한 전류와 전압을 망라하여 널리 쓰이고 있으며 다른재료를 사용한 케이블 보다 설치하기에 쉽고 사용법이 비교적 간단하고, 또한 전력망(network)에서의 신뢰서이도 높은 것으로 나타나 매우 만족스런 재료로 인정받고 있다.