• Title/Summary/Keyword: ultra-light

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Research on Light Reflection Effect of the Optical Micro Pattern Using Ultra-Precision Technology (초정밀가공 기술을 이용한 광학 마이크로패턴의 광 반사 효과에 관한 연구)

  • Yoo, Chun-Kun;Yoon, Chul-Yong;Hyun, Dong-Hun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.6
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    • pp.621-628
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    • 2009
  • Because the Ultra-Precision Technology increase its competitiveness in the field of the design, precision of processing technology, confidence and fixation degree are major considerations. According to Pattern shapes using these processing technologies, Light Reflection has influence on the sense of sight about human being. Based on background of these studies, we draw a plan about a round workpiece using a 3D design program and analyze the effect on Light Reflection changing a pattern angle and a source of light through SPEOS program in this research. We make Pattern form as V-Shape, and compare the area distributed by Light Reflection by classifying angle into 4 and analyze changes according to a source of light. In order to measure and evaluate the data from simulation analysis we has manufactured Diamond Tool and has processed Pattern precision using a Ultra-Precision Machine. Based on the result of this study, we forecast that the field of design will achieve rapid growth due to Ultra-Precision Technology in the world market.

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The Study on Structures and Contents for Flight Information Service of Light Aircraft and Ultra-light Aircraft (경량항공기 및 초경량비행장치 비행정보서비스를 위한 구성체계 연구)

  • Choi, Hyunsik;Moon, Woochoon
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.22 no.3
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    • pp.1-7
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    • 2014
  • The base of leisure air activities are consistently expanding and its demand is expected to increase attributed to GDP growth and people's interest in its activity. Utilizing Visual Flight Rule, light sport aircrafts and ultra-light aircrafts are not under the effect of air traffic control center, which resulted in passenger injury due to emergency landing for adverse weather conditions and technical issues after pulling into mountain area, ocean and even urban area. Such events encouraged safety consciousness toward leisure aircraft activities and developing a measure to prevent a recurrence of the accident. This research focuses on suggesting compositive system for preventive safety management system by providing user based Flight information service and operating effective system, necessary for leisure aircraft activities.

A Study on Statistical Methods for the Light Weight Estimation of Ultra Large Container Ships (초대형 컨테이너선의 경하중량 추정을 위한 통계적 방법 연구)

  • Cho, Yong-Jin
    • Journal of Ocean Engineering and Technology
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    • v.23 no.3
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    • pp.14-19
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    • 2009
  • The present study developed a model to estimate the light weight of an ultra-large container ship. The weight estimation model utilized container ship data obtained from shipyards and the subdivided this weight data into appropriate weight groups. Parameters potentially affecting the group weight were selected and expanded based on experience for weight estimation, and a correlation analysis was performed by the SPSS program to determine the key parameters characterizing the group weight. A weight estimation model applying the multi-regression analysis was proposed to assess the weight of an ultra-large container ship at the preliminary design stage, and the results obtained by the suggested method showed good agreement with the shipyard data.

LED Light Coupler Design for a Ultra Thin Light Guide

  • Lee, J.H.;Chang, W.;Choi, D.
    • Journal of the Optical Society of Korea
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    • v.11 no.3
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    • pp.113-117
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    • 2007
  • A LED light coupler is proposed for coupling light from a mini side LED of 0.4 mm height to a very thin (${\sim}0.3 mm$) light guide. Due to the ultra thinness of the light guide, conventional light couplings between LEDs and light guides do not provide adequate coupling efficiency. The designed LED coupler is a compound lens of 3.5 mm length, 1.2 mm height, and 3.3 mm width. The courier first collimates the light from the LED and then concentrates the light in a manner similar to a compound parabolic concentrate, (CPC) into the light guide. The exit surface of the coupler is additionally textured to have micro patterns in order to control the radiance profile.

Korean Secondary Students' Conceptions about Visible light, Ultra Violet and Infrared Ray (가시광선, 자외선과 적외선에 대한 학생들의 개념)

  • Han, Shin;Park, Tae-Yoon;Jeong, Sophia Sun Kyung
    • Journal of the Korean Society of Earth Science Education
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    • v.8 no.1
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    • pp.35-44
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    • 2015
  • The purpose of this paper is to identify the conceptions of middle school and high school students about visible light, Ultra violet(UV) and Infrared ray(IR). We administered questionnaire 40 people of middle school 3rd students and 43 people of high school 2nd students in Gyeonggi-do. Misconceptions about visible light, UV and Ir were observed in many students. The results of study are as follows: Firstly, Many students think that it is possible to see objects without visible light. The explanations given by students for the visiblity of objects in darkness indicates a heavy reliance on personal experiences. Secondly, we have confirmed that high school students well understand the fact that the object reflects the light. However, a significant number of students exhibited an eye-centered perspective of vision. Thirdly, students had a variety of ideas about the meaning of the term UV and IR. Analysis of questionnaire data indicates that many students believe that it is possible to see objects in the presence of UV light alone.

RASE Acquisition Algorithm of Ultra Wideband System for Car Positioning and Traffic Light Control (차량 위치추적기반 교통신호등 제어용 UWB 시스템의 Acquisition 알고리즘 연구)

  • Hwang, In-Kwan;Park, Yun-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.10C
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    • pp.992-998
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    • 2005
  • In this paper, An Ultra Fast Acquisition Algorithm of low transmission rate ultra-wideband(UWB) systems for car positioning and traffic light controling is proposed. Since the acquisition algorithms for CDMA system are not fast enough to access the low transmission rate UWB systems, the new ultra fast acquisition scheme which can be implemented with low cost and simplified circuit is required. The proposed algorithm adopted the Recurrent Sequential Estimation scheme and trinomial M-sequence. Therefore, The proposed scheme can reduce the average acquisition time in $1\~3{\mu}sec$ with simple circuit, even for the UWB systems which use long pseudo-noise(PN) sequence and transmit low power below the FCC EIRP emission limits. The simulation results for the average acquisition time of the proposed scheme are compared with the ones of the existing acquisition schemes.

Design Modification of Airframe Shape for Ultra Light Quad-Rotor Development (초소형 쿼드로터 개발을 위한 기체형상 설계변경)

  • Park, Dae-Jin;Lee, Sangchul;Park, Saeng-Jin;Song, Tae-Hun
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.25 no.4
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    • pp.44-51
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    • 2017
  • An ultra light quad-rotor is utilized in various areas for military and commercial purpose. Especially, the airframe shape is designed with various airframe size, weight and purpose. In this paper, the initial airframe shape of the quad-rotor was designed and manufactured. Flight test was conducted for the quad-rotor. The design modification of airframe shape was conducted to meet design requirement. By changing design, weight of airframe structure was reduced and payloads were placed to the best position. By reinforcing ribs and reducing vehicle's legs, the durability of airframe structure was enhanced.

A New Way to Manufacture Ultra Light Metal Structures (초경량 금속구조재의 제작을 위한 새로운 방안)

  • Kang, Ki-Ju;Jeon, Gye-Po;Nah, Seong-Jun;Ju, Bo-Seong;Hong, Nam-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.3
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    • pp.296-303
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    • 2004
  • Recently, the ultra light metal structure with periodic and three dimensional truss elements takes attention because of its multi-functionality and substantial heat resistance. However, the complicated fabrication process leading to high cost has been a major obstacle to wide applications. In this paper, a new idea to construct an ultra light structure with periodic, three dimensional truss using metal wires is presented. To prove the practical validity, a Kagome-like structure was fabricated from stamped wires and punched face sheets. It was assembled by soldering. Through three-point bending and compression tests, the strength was evaluated and compared with the theory.

Avalanche Phenomenon at The Ultra Shallow $N^+$-P Silicon Junctions (극히 얕은 $N^+$-P 실리콘 접합에서의 어발런치 현상)

  • Lee, Jung-Yong
    • Journal of the Semiconductor & Display Technology
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    • v.6 no.3
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    • pp.47-53
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    • 2007
  • Ultra thin Si p-n junctions shallower than $300{\AA}$ were fabricated and biased to the avalanche regime. The ultra thin junctions were fabricated to be parallel to the surface and exposed to the surface without $SiO_2$ layer. Those junctions emitted white light and electrons when junctions were biased in the avalanche breakdown regime. Therefore, we could observe the avalanche breakdown region visually. We could also observe the influence of electric field to the current flow visually by observing the white light which correspond to the avalanche breakdown region. Arrayed diodes emit light and electrons uniformly at the diode area. But, the reverse leakage current were larger than those of ordinary diodes, and the breakdown voltage were less than 10V.

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Development of an Ultra Light Flying Device for Remove the Vespiary (말벌 집 제거용 초경량 비행장치의 개발)

  • Geun-Chul Lee;Kyong-Jin Park
    • Journal of the Korean Society of Industry Convergence
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    • v.26 no.3
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    • pp.395-400
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    • 2023
  • Recently, the number of hornet is rapidly increasing because of change in the ecological climate. It gives a sense of threat to the people and damages the beekeeping industry as a predator of honey bees. Firefighters are working to remove hornet and vespiary, but it has been reported that it is difficult to remove at high altitudes. In this study, an ultra-light flying device was developed to remove vespiary. It has been developed in four types: Drug spray type, Clamp type, Cutter type, and Scraper type, which can be used as field-customized equipment. Therefore, the developed equipment is expected to contribute to the safe field activities of firefighters.