• Title/Summary/Keyword: 녹도

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A Study on Digital Control Method of LED Luminance (LED 휘도의 디지털 제어 방식에 관한 연구)

  • Kang, Shin-Ho;Ryeom, Jeong-Duk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.1
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    • pp.28-34
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    • 2010
  • The pulse width modulation(PWM) method has been generally used as conventional method controlling luminance of LED(light emitting diode). PWM method as analog method with a relation that duty ratio of LED be proportional to luminance has weak point that it is not compatible with digital method of communication etc. In this paper, a experiment is conducted which the luminance of RGB LED be controlled by digital method. For this, the LED digital control system is developed which consist of LED driving circuits and digital logic circuits. By controlling the number of pluses on RGB LED versus digital input, various lighting colors is implemented and digital codes are optimized in order that measured x, y chromaticity coordinates of lighting colors are comprised in the CIE chromaticity coordinates area of targeted lighting colors. The result of this study can be utilized usefully in research on implementing full color by using remote control of LED lamp with digital communication.

A Master Plan for the 2002 World Cup Sports Complex in the Suwon City, Korea (수원시 2002 월드컵 종합체육공원 기본계획)

  • Kim, Sung-Kyun
    • Journal of the Korean Institute of Landscape Architecture
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    • v.30 no.6
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    • pp.119-127
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    • 2003
  • 본 연구는 수원시의 다양한 레크레이션의 수요증대와 지역주민을 위한 운동시설의 부족에 대응하기 위해 지역주민의 근린생활 체육시설을 확충하고, 수원시 연고의 삼성 블루윙즈 프로축구팀의 축구전용구장 및 연습구장 마련 및 2002널 월드컵 축구대회를 유치하고자 조성된 복합 스포츠판지에 대한 기본계획안이다. 개발방향은 1) 21세기의 생활패턴에 맞는 생활체육공간 조성, 2) 국제적 수준의 운동시설 및 인프라구축, 연중이용이 가능한 시민을 위한 커뮤니티 공간조성, 3) 친환경적이고 지속가능한 공간조성, 4) 복합적 토지 이용 개념을 도입하여 토지 활용도 및 재정 수입의 증대, 5) 쾌적한 보행시스템 제공, 6) 도시의 랜드마크로서 주변 도시체계와 연계성 강화, 7) 수원의 역사, 문화적 상징성 제고 등이다. 이를 위해 축구전용구장, 보조경기장, 잔디연습구장, 흙연습구장, 헬리포트장 능 축구전용구장 관련시설, 실내체육관, 실내 아이스링크 등 기타 체육시설, 야외 수영장, 농구장, 테니스장, 게이트볼장, 볼링장, 헬스장 등 생활체육시설, 스포츠용품 몰, 식음시설 등 편익시설, 야외공연장, 어린이정원, 영화관, 축구박물관 등 위락/문화시설, 산책로, 체력단련코스, 전망대 등 휴양시설, 그리고 주차장, 녹도, 녹지 등 기타 부대시설이 도입되었다. 본 연구는 종합체육공간이 단순히 체육시설이 모여 있는 곳이 아니라 시민들이 운동과 더불어 휴식, 등산, 놀이, 자연 학습 등 다양한 여가활동을 할 수 있도록 계획되었다. 상업시설, 커뮤니티 시설 등이 복합적으로 개발되어 있기 때문에 경기가 열릴 때뿐만 아니라 4계절 내내 주중, 주말 및 휴가기 간에 가족과 더불어 휴식을 취할 수 있는 레크레이션 및 커뮤니티 공간으로 중요한 역할을 하도록 계획된 새로운 개념의 체육공간이라는데 의의가 있다.

Physiologic Races of Puccinia graminis f. tritici in Korea (한국에 분포한 맥류 줄기녹병균(Puccinia graminis f. sp. tritici)의 생리적 품종)

  • Chung Bong Koo;Lee Ji Young
    • Korean journal of applied entomology
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    • v.12 no.2
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    • pp.79-82
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    • 1973
  • 1. In order to investigate Physiologic races of Puccinia gramininis f. sp. tritici as basic materials for tile breeding of resistant varieties to stem rust of wheat, this experiment was carried out during 1971 and 1973. 2. Twenty seven isolates of the fungus were identified as follows: two isolates of race 11, eight . isolates of race 17, and 21, four isolates of race 34, one each of race 37 and 56, respectively The remaining three isolates identified were not identical with the key issued by Stakman, et at in 1962. Therefore, the three new races were tentatively numbered $K_3,\;K_4\; and\; K_4,$ in addition to $K_l\;and\;K_2$ described in 1961. 3. Therefore, attempts to produce resistant varieties to stem rust of wheat should be accompanied by intensive investigation of Physiologic races of p. graminis f. sp. tritici in the future.

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Development of the Blood Glucose Strip for the Detection of Glucose in Blood (혈당 측정용 스트립 개발에 관한 연구)

  • 송은영;김경아;이홍수;권두한;남효진;김희정;변시명;정태화
    • Biomedical Science Letters
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    • v.4 no.2
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    • pp.103-112
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    • 1998
  • We have developed a simple and accurate strip test that measures the blood glucose level semiquantitatively by visual observation, or qualitatively by using UltraScan spectrocolorimeter. The strip has solid phase reagents, including glucose oxidase, peroxidase, chromogen, affixed to a plastic support. The strip test is capable of measuring blood glucose level in the range of 0∼800 mg/dl and generating the results within 2 to 3 minutes. Human blood specimens obtained from normal individuals and the diabetic patients were evaluated by the new blood glucose strip and by the kit supplied by other commercial products. The test results exhibit the correlation coefficient of 0.964. The new test strip is proven simple and accurate, and it offers an alternative to the commercially available glucose tests.

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Analysis of mixed mode surface crack in finite-width plate subjected to uniform tension and bending by boundary element method (경계요소법에 의한 등분포인장과 굽힘을 받는 유한폭 판재의 혼합 모드 표면균열에 대한 해석)

  • 박성완;홍재학
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.6
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    • pp.1592-1602
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    • 1990
  • Mixed mode surface crack in finite-width plate subjected to uniform tension and bending has been analyzed in 3-D problem by using boundary element method. The calculations were carried out for the surface crack angles(.a/pha.) of 0.deg., 15.deg., 30.deg., 45.deg., 60.deg., and 75.deg., and for the aspect ratio(a/c) of 0.2, 0.4, 0.6 and 1.0 to get stress intensity factors at the boundary points of the surface crack. For the aspect ratio of 1.0 and the surface crack angles, finite element method was used to check the results in this study. Comparison of the results from both methods showed good agreement.

First Report of Rust Disease Caused by Puccinia phragmitis on Rumex japonicus in Korea (Puccinia phragmitis에 의한 참소리쟁이 잎녹병 발생 보고)

  • Lee, Seung-Yeol;Park, Ji-Won;Kang, In-Kyu;Jung, Hee-Young
    • Research in Plant Disease
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    • v.26 no.1
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    • pp.53-56
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    • 2020
  • Red spots symptoms were observed on the leaves of Rumex japonicus Houtt. in Goesan, Korea, in May 2019. Diseased leaf showing red spot and white-colored sori were found behind of diseased leaves. Aeciospores were confirmed and observed using a stereomicroscope, light microscope, and scanning electron microscope. They were globose or ovoid and measured 19.0-24.4×19.0-24.5 ㎛, with verrucae ornamentation. For the phylogenetic analysis, partial of large subunit rDNA region and cytochrome c oxidase subunit III were sequenced. As a result, the isolated fungus species showed high similarities with Puccinia prizeliana. Based on the previous report, morphological characters, phylogenetic analysis, it was confirmed as Puccinia phragmitis which have not been reported in Korea, and we firstly report this fungal agent on R. japonicus as P. phragmitis in Korea.

The effect of gap between ingot and crucible on the distribution of initial melt concentration in Bridgman crystal growth (Bridgman 결정성장시 장입 주괴와 도가니 사이의 틈이 용액이 초기농도에 미치는 영향)

  • Seung-Mo Chung;Man-Sug Kang;Zin-Hyoung Lee
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.4 no.2
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    • pp.169-177
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    • 1994
  • Dilute Al-Cu and Al-Mg alloys were solidified unidirectionally upward by Bridgman method. It is necessary that solute concentration of initial melt is uniform to be able to control the concentration of crystal. When solute concentration is not uniform, it can cause unusual macro-segregation in grown solid. A non-steady state solidification was observed where the solute concentration in the grown solid decreased with the progress of solidification, when a dilute Al-Cu melt with positive axial temeprature gradient was solidified. This was caused by leaking out of Cu-rich melt into the gap between ingot and crucible during melt-down and its sedimentation after complete melting. In the case of Al-Mg alloy, the solute concentration has a minimum in the middle of grown specimen because Mg-rich melt flowed down the gap between ingot and crucible and floated after complete melting. Uniform initial melt concentration can be achieved by the homogenization of the ingot or by the absence of the gap between ingot and crucible.

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A Study on the Chemical Pre-Treatments Suitable for the Layer Differentiation of FRP Waste (폐FRP의 층간분리를 위한 전처리방법에 관한 연구)

  • Lee, Seung-Hee;Lee, Jung-Ki;Kim, Yong-Ju
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.15 no.1
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    • pp.47-53
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    • 2012
  • As one of the methods for recycling the FRP from the waste ships, separation of roving layer from the mat has some merits in a sense of the eco-friendly and economical recycling process. Similar characteristics, however, between the roving and the mat even with different ratio of the resin and the glass and the thickness of the roving, much thinner than the mat, make the mechanically automatic differentiation difficult. In this study spectrochemical differentiation between the two layers has been made using boiling concentrated sulfuric acid, methanol and isopropanol solution saturated with KOH, or hydrogen fluoride (HF) solution. Furthermore efficiently coloring water-soluble dye following the HF treatment makes the roving layer more distinguishable photophysically. The layer differentiation and the automatic layer distraction move up the date of simple and automatic separation process for the waste FRP.

A Study on the Chemical Treatments Suitable for the Simple Mechanical Manipulation During the Recycling Process of FRP Waste from Ships (폐 선박의 FRP를 재활용 과정에서 용이한 기계적 조작을 위한 화학적 처리 방법에 관한 연구)

  • Lee, Seung-Hee;Kim, Yong-Seop;Yoon, Koo-Young
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.12 no.1
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    • pp.55-59
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    • 2009
  • As one of the methods for recycling the FRP from the small and medium waste ships, separation of roving layer from the mat has some merits in a sense of the recycling energy and the environmental effects. Similar characteristics, however, between the roving and the mat even with different ratio of the resin and the glass and the thickness of the roving, much thinner than the mat, make the mechanically automatic differentiation difficult. In this study spectrochemical differentiation between the two layers has been made using (1) boiling concentrated sulfuric acid which can dissolve the resin in the FRP layer, (2) methanol and isopropanol solution saturated with KOH which can dissolve the glass, or (3) hydrogen fluoride(HF) solution which can reacts with $SiO_2$ fragments of the glass. Furthermore coloring water-soluble dye following the HF treatment makes the roving layer more distinguishable photo-physically.

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Five Indices of SSaM-GG(=Smart, Shared, and Mutual- Green Growth) for Sustainable Development (지속가능/영속(永續)발전을 위한 지속성/안녕(安寧)성의 5대 지표(=SSaM-GG) 개발)

  • Koo, Ja-Kong;Park, Sang Ryul;Lee, Seul Ki
    • Journal of the Korea Organic Resources Recycling Association
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    • v.20 no.4
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    • pp.127-133
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    • 2012
  • The 'SSaM-GG'(=Smart, Shared, and Mutual- Green Growth) as the five bottom lines for sustainable development is developed and suggested. Because the name of Green Growth alone is not sufficient for clear conceptualization, implementation. and etc. For the global harmonized usage & application, the Eastern-Western conceptual fusion has been performed, and verified for more than 12 years on the worldwide successes and failures.