• 전기학회논문지P
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• 제61권3호
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• pp.140-148
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• 2012

Aeronautical lights, which are internationally standardized sequence of colors and placements, are aeronautic safety devices that provide visual information to pilots by continuously adjusting their light intensity to appropriate level. In this paper, we consider the development testing for in pavement LED aeronautical light system such as taxiway centerline, stop line and temporary stop line. The test results of LED sourced lights have shown a drastic improvement in power consumption levels and cost efficiency compared to their halogen sourced counterparts The LED light used only 42.7% as much power as their halogen sourced counterparts. Taking installation costs into account, LED will cost only 58% of its halogen counterparts. These results suggest that developing the LED sourced aeronautical light would result in globally competitive products thar guarantees satisfaction to their consumers, and that both cost effective and energy efficient.

• Journal of Astronomy and Space Sciences
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• 제25권1호
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• pp.19-24
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• 2008

접촉 식쌍성 WZ Cep를 CCD 측광관측하여 BVR 광도곡선을 얻고, 5개의 극심 시각을 결정하였다. 새로운 3색의 광도곡선을 Wilson-Devinney 프로그램에 적용하여 측광학적인 해를 구하고, 광도곡선의 장주기 변화를 검증하였다. 우리 광도곡선의 형태는 전형적인 W UMa형의 대칭적인 것으로 나타나는 반면에 Hoffimann(1984)의 광도곡선은 매우 심한 O'Connell 효과를 보이는 비대칭으로 나타난다. WZ Cep의 대칭적인 광도곡선은 Djurasevic et al.(1998)의 광도곡선에서도 확인되었다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2005년도 한국우주과학회보 제14권1호
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• pp.35-35
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• 2005

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 1996년도 한국우주과학회보 제5권1호
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• pp.22-22
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• 1996

No Abstract, See Full Text

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2001년도 한국우주과학회보 제10권1호
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• pp.21-21
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• 2001

No Abstract, See Full Text

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 1995년도 한국우주과학회보 제4권1호
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• pp.12-12
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• 1995

No Abstract. See Full-text

• 설비공학논문집
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• 제27권6호
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• pp.328-336
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• 2015

Currently, 22% of the total energy consumption of buildings in Korea is used for lighting. Light-shelves have garnered attention as a way to reduce consumption, but there are few studies on the types of curve and curvature, which limits the improvement of light-shelf performance and its design. This study constructed a test bed of actual residential types to evaluate the performance. Outcomes of light usage, according to variables of light-shelves, were used as indicators of performance evaluation. The results are as follows:1) Performance evaluation was conducted on flat-type light-shelves to verify performance of curvature-shelves, which are movable with a width of 200 mm, and the most ideal angle and specification per solar term are calculated. 2) The (-) shaped curvature contributed to a reduction in energy consumption and an improvement of evenness. 3) In case of light-shelves with (-) shaped curvature, an increased angle not exceeding $80^{\circ}$ of the arc contributed to an improvement of light penetration. 4) Appropriate specifications of curved light-shelves include movable types with widths of 200 mm, and angle ranges of $20^{\circ}{\sim}60^{\circ}$. 5) Light energy consumption of a movable light-shelf with curvature and width of 200 mm were reduced by 17% and 7.8% compared to a $0^{\circ}$ fixed and a movable light-shelf, respectively.

• International Journal of Computer Science & Network Security
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• 제23권3호
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• pp.169-176
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• 2023

The vehicular ad hoc network (VANET) is currently an important approach to improve personal safety and driving comfort. ANEL is a MAC-based authentication scheme that offers all the advantages of MAC-based authentication schemes and overcomes all their limitations at the same time. In addition, the given scheme, ANEL, can achieve the security objectives such as authentication, privacy preservation, non-repudiation, etc. In addition, our scheme provides effective bio-password login, system key update, bio-password update, and other security services. Additionally, in the proposed scheme, the Trusted Authority (TA) can disclose the source driver and vehicle of each malicious message. The heavy traffic congestion increases the number of messages transmitted, some of which need to be secretly transmitted between vehicles. Therefore, ANEL requires lightweight mechanisms to overcome security challenges. To ensure security in our ANEL scheme we can use cryptographic techniques such as elliptic curve technique, session key technique, shared key technique and message authentication code technique. This article proposes a new efficient and light authentication scheme (ANEL) which consists in the protection of texts transmitted between vehicles in order not to allow a third party to know the context of the information. A detail of the mapping from text passing to elliptic curve cryptography (ECC) to the inverse mapping operation is covered in detail. Finally, an example of application of the proposed steps with an illustration

• Journal of Astronomy and Space Sciences
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• 제30권3호
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• pp.179-185
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• 2013

Photometric observation is one of the most effective techniques for determining the physical characteristics of unknown space objects and space debris. In this research, we examine the change in brightness of the Communication, Ocean, Meteorological Satellite-1 (COMS-1) Geostationary Orbit Satellite (GEO), and compare it to our estimate model. First, we calculate the maximum brightness time using our calculation method and then derive the light curve shape using our rendering model. The maximum brightness is then calculated using the induced equation from Pogson's formula. For a comparison with our estimation, we carried out photometric observation using an optical telescope. The variation in brightness and the shape of the light curve are similar to the calculations achieved using our model, but the maximum brightness shows a slightly different value from our calculation result depending on the input parameters. This paper examines the photometric phenomenon of the variation in brightness of a GEO satellite, and the implementation of our approach to understanding the characteristics of space objects.

• 한국의류산업학회지
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• 제5권4호
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• pp.324-330
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• 2003

The purpose of this study is on the meaning and variety about gender expressed in modern fashion. The results are as follows ; First, the typical masculine gender was authority, discretion as a result of heteropatriarchy focused on the western reason. It was conservative and the symbolic image type of the meaning excluded masculine sexual expression. Dress and its ornament was expressed as the style of straight silhouette, dark color, rough and stiff material. Second, the typical feminine gender was the symbolic image type of a mother and a wife defined relatively by man as a result of western heteropatriarchy and the image type which men regarded women as sexual objects. Dress and its ornament was expressed as the style of silhouette which let bodily curve out, light color, soft material. The most typical item is dress and suit. Third, androgyny has been described as the feminie gender of androgynous, which shows masculine image as the effect of feminism and social success of professional women. Dress and its ornament is expressed as the style of business suit, the symple of typical man's one. The masculine gender of androgynous is showed man's suit as silhouette that let bodily curve out, light color, exposure and soft material, which is the symbol of feminine dress, Fourth, unisex is the area of dress and its ornament used the sexless symbol which there has been no gender more because of the spread of sports and diffusion of leisure in life style.