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아크릴산의 플라즈마 중합에 의한 나일론 6필름의 표면개질
이기풍,송석규 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.4
Plasma polymerization of acrylic acid(AA) onto nylon 6 (PP-AA/nylon 6) film was studied in terms of discharge power(W), plasma polymerization time and sample position. The chemical structures of PP - AAInylon 6 films were systematically changed by controls of W and plasma polymerization time and which changes were enhanced dyeability of the films. The wettability of the films were evaluated by the measurement of contact angle against water onto PP - AA/nylon 6. In the case of Ar plasma treatment onto nylon 6 films the contact angle was 300 and changed remarkably to 50˚ after 30 days in air otherwise the values onto PP-AA/nylon 6 films were 34-37˚. It was confirmed that the stable wettability of the modified film was resulted from the cross-linked structure of the plasma polymers.
이기풍,송석규 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.2
The chemical structure, surface free energy and optical characteristics of plasma polymerized hexafluorobenzene(PP-HFB) were investigated in terms of discharge power(W) and feed-in rate of monomer(Fm). It was observed that CF2 and CF$_3$bond in PP - HFB were newly generated and optical transmittance of the plasma polymers were promoted with an increase of input energy(W/Fm) level of glow discharge. It was found that PP-HFB showed highly hydrophobicity and their refractive indexes were changed from 1.458 to 1.621. It was enhanced the color deepening effect on the dyed polyester fabric by the PP-HFB coating.
[구조강도부문] 유한요소 극한해석을 이용한 굴곡을 가진 박판부재의 단면비에 따른 붕괴특성 평가
김기풍(Keepoong Kim),김현섭(Hyunsup Kim),허훈(Hoon Huh) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is concerned with collapse characteristics and an energy absorption capacity for thin-walled structures with curved shape with respect to aspect ratio of cross-section. The energy absorption capacity influence on yield strength and geometric shape such that shape of cross-section and thickness. S-rails with several aspect ratio of rectangle cross-section are selected for thin-walled structures with curved shape. The analysis of an S-rail has been carried out using finite element analysis for evaluation of collapse characteristics. For collapse analysis of an S-rail limit analysis formulation with shell element has been derived and a contact scheme has been considered. Collapse analysis has been carried out for an S-rail with several rectangle cross-section and the energy absorption ratio with respect to aspect ratio of cross-section is calculated. From this result, references for fundamental design have been shown for thin-walled structures with curved shape.
김기풍(Keepoong Kim),김세호(Seho Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, optimization for frontal crashworthiness is carried out for the weight reduction design of an auto-body member with aluminium extrusions. The frontal crashworthiness is evaluated in order to optimize thicknesses for the front rail member of the ULSAB-AVC. Thicknesses of the front rail member made of aluminium extrusions are optimized by comparison of crushing distance, absorbed energy, the deceleration and compartment intrusions for the auto-body with the response surface methodology. The results demonstrate that the crashworthiness of the front rail member made of aluminium extrusions with the optimum thicknesses is similar to analysis results obtained from the ULSAB-AVC project. The results also show that the weight reduction design is performed by substituting the aluminium alloys for steels such as 440E and advanced high strength steels in the auto-body members.
권기풍,서승우 대한전기학회 2009 전기의 세계 Vol.58 No.8
지능형 전력망은 통신 기술을 통해 에너지 사용을 최적화 하고 안정성을 높이는 차세대 전력망으로서 그 내부에는 다양한 통신 환경과 특성이 존재한다. 지능형 전력망에서는 일반 수용가의 부하특성이나 전기 사용량 등 비실시간 정보뿐만 아니라 전력망의 안정적이고 지능적인 운영을 위한 다양한 감시제어 데이터와 같은 실시간 정보가 함께 전달된다. 이러한 정보들은 전달 과정에서 누출, 변조가 되지 않고 원하는 사용자에게 원하는 시간과 장소에 정상적으로 전달될 수 있도록 높은 수준의 정보 보안이 뒷받침 되어야 한다. 그러나 최근, 감시제어 정보 전달은 보통 인터넷과 같은 일반적인 통신보다 고품질을 요구하기 때문에, 통신 품질을 저하시킬 수 있는 보안 서비스를 지능형 전력망에 적용하기에는 제약이 따른다. 본 논문은 지능형 전력망의 주요 통신 환경별 요구사항을 살펴보고, 이러한 요구사항을 만족시키면서 높은 수준의 정보 보안을 제공하기 위해 어떠한 보안 서비스가 제공되어야 하는지 알아본다.