• Title/Summary/Keyword: Original plant

Search Result 440, Processing Time 0.031 seconds

백업(Back-up) 제어기의 성능 시험을 위한 보일러 제어시스템의 시뮬레이터 개발에 관한 연구 (A study on the development of a simulator for a boiler control system in order to test a back-up controller)

  • 황동환;김지홍;변증남
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1987년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 16-17 Oct. 1987
    • /
    • pp.603-606
    • /
    • 1987
  • A simulator is designed in order to evaluate the performance a f a lockup controller. The original analog controller and boiler plant are transformed into digital form model, in which the plant is modeled as a 2 input-2 output system connected to first order peripheral units. The experimented results show that the simulated system renders the same steady state characteristics as data and show usability of simulator.

  • PDF

한국 고유식물의 종속지 Ⅶ. 작살나무속식물의 분류와 종간유속관계 (Monographic Study of the Endemic Plants in Korea Ⅶ. Taxonomy and Interspecific Relationships of the genus Callicarpa)

  • 정영호
    • Journal of Plant Biology
    • /
    • 제30권2호
    • /
    • pp.151-170
    • /
    • 1987
  • Taxa of genus Callicarpa in Korea were described taxonomically and studied interspecific relationships, based on the leaf length, leaf width, peduncle length, fruit width and geograhic distribution. Among 12 taxa reported previously in Korea, 3 forms of C. japonica were unifed to original species, C. japonica var. glabra was reserved, Whereas C. shirasawana was not distributed in Korea. As a result, 7 taxa belonging to 3 species, 4 varieties of genus Callicarpa remained. C. japonica complex is considered to be more advanced among the species compared with the bract shapes.

  • PDF

발전소 보일러 제어기의 back-up 제어에 관한 연구 (A Study on the Back-up Control of Boiler Controller for a Thermal Power Plant)

  • 김지홍;조영조;정광균;변증남
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(I)
    • /
    • pp.213-215
    • /
    • 1987
  • As a means of improving the reliability of the analog type controller for the thermal power plant, an efficient method is proposed, which is to place the hardware redundancy, i.e. a back-up controller with fault detecting capability. FTCS is implemented by using multi-processors and it is experimentally verified that the back-up controller takes over the role of the original controller, controlling the faulty loop.

  • PDF

Occurrence of Anthracnose on English Ivy Caused by Colletotrichum trichellum in Korea

  • Kim, Wan-Gyu;Hong, Sung-Kee;Cho, Weon-Dae
    • Mycobiology
    • /
    • 제29권2호
    • /
    • pp.107-109
    • /
    • 2001
  • Anthracnose symptoms severely occurred up to 50% on leaves of English ivy growing in greenhouses in Cheongwon area of Korea during disease survey in April, 2000. The symptoms developed as concentric spots with dot-like acervuli on leaves of the plant. A total of 24 isolates of Colletotrichum sp. were obtained from the spotted lesions and identified as Colletotrichum trichellum based on the morphological and cultural characteristics. Leaf spots similar to the original anthracnose symptoms were induced on the host leaves by artificial inoculation with the isolates of the fungus. This is the first record of C. trichellum causing anthracnose of English ivy in Korea.

  • PDF

Simplification of the Plant Models in PSA

  • Kim, Myung-Ro;Lee, Beom-Su;Kang, Sun-Koo
    • 한국원자력학회:학술대회논문집
    • /
    • 한국원자력학회 1996년도 춘계학술발표회논문집(2)
    • /
    • pp.499-504
    • /
    • 1996
  • Current Probabilistic Safety Assessment (PSA) techniques are not usually utilized for day-to-day applications in nuclear power plants. The major reason for this anomaly is the complexity of plant models developed for PSA studies and the multitude of resulting fault trees. This impediment can be overcome by the use of simplified plant models. However, oversimplified models usually result in loss of valuable information and therefore. simplification approaches have to be used judiciously in order to achieve accurate and meaningful results. For this reason. development of an appropriate simplification approach must be performed using extreme caution followed with results verification in sequence as well as system levels. If there are no significant differences between the simplified and the original models, the simplified model can be efficiently used in the application of the PSA. This paper presents a methodology for how to develop a suitable simplification technique and the results of its verification for sample systems and sequences. The results show that the utilization of simplified plant models will significantly reduce the number of fault trees with no significant loss of accuracy.

  • PDF

Gas Turbine Data Acquisition and Monitoring System for Combined Cycle Power Plant

  • Kang, Feel-Soon
    • Journal of information and communication convergence engineering
    • /
    • 제6권4호
    • /
    • pp.405-410
    • /
    • 2008
  • This paper presents a data acquisition and monitoring system for a gas turbine. The proposed system entitled C-Tune DAS plays an important role to make an analysis of the real-time operation of the gas turbine under maintenance. The designed LabVIEW based software is divided into three parts according to their original functions, i.e., data acquisition, data analysis with display, and data storage. The data acquisition part receives data from a PMS (Plant Management System) server and two cFPs (Compact-Field Point). To verify the validity of the developed system, it is applied to gas turbines in the combined cycle power plant in Korea.

Effect of Drying Agents and Ethyl Alcohol on Change of Flower Color of Gentian (Gentiana uchiyamai) in Pressed Flower

  • Song, Won-Seob;Kim, Young-Sun
    • Plant Resources
    • /
    • 제5권2호
    • /
    • pp.124-140
    • /
    • 2002
  • The effects of drying agents and ethyl alcohol treatment on the flower color of Gentiana uchiyamai. The flower color was not much changed in flower sheet, in the case of absorbtion papers only. The color was least changed in Korean and China hwasunjis, in the case of absorbtion papers and silica gel treatment. The color was less changed in flower sheets, window papers, and China hwasunjis, and was most changed in newspapers, in the case of absorbtion papers and Na$_2$SO$_4$ treatment. The color was least changed in China hwasunjis, and most changed in dampened papers, in the case of absorbtion papers and CaO treatment. The color tended to change far from the original one, as treatment time got longer, in the case of 0.01M and 0.lM of tartaric acid. The longer the treatment time and the bigger the concentration of ethyl alcohol, the bigger flower color.

  • PDF

Anthracnose of May Lily Caused by Colletotrichum liliacearum

  • Kim, Wan-Gyu;Hong, Sung-Kee;Cho, Weon-Dae
    • Mycobiology
    • /
    • 제30권1호
    • /
    • pp.57-59
    • /
    • 2002
  • Anthracnose symptoms severely occurred up to 100% on leaves of May lily grown in four locations in Korea during a disease survey in 2001. The symptoms appeared as circular to irregular spots with brown to dark brown discoloration on leaves of the plant, and severely infected leaves blighted. A total of 35 isolates of Colletotrichum sp. was obtained from the spotted lesions and identified as Colletotrichum liliacearum based on the morphological and cultural characteristics. Leaf spots similar to the original anthracnose symptoms were induced on the host leaves by artificial inoculation with the isolates of the fungus. This is the first report that C. liliacearum causes anthracnose of May lily.

TECHNICAL EVALUATION OF THE CONTINUED OPERATION OF NPP

  • Kim, Tae-Ryong;Jin, Tae-Eun
    • Nuclear Engineering and Technology
    • /
    • 제40권4호
    • /
    • pp.277-284
    • /
    • 2008
  • Recently, the long-term operation of a nuclear power plant beyond its licensed term has become a worldwide trend as long as the safety of the plant is maintained in the extended period. Kori Unit 1, the oldest PWR in Korea, is the foremost example of this type of long-term operation in Korea. Comprehensive technical evaluation of the long-term operation of this plant was completed to confirm the overall safety of the plant. The technical evaluation included a review of PSR results, an assessment on aging management programs and time limited aging analyses, and a statement of radiological impact on the environment. Based on all of the results of the technical evaluation activities, Kori Unit 1 was approved to operate for an additional 10 years beyond its original design life of 30 years.

천연식물자원 활용 코로나19 억제 치료제 개발 (Development of Drug Candidates based on Natural Products Against COVID-19)

  • 강세찬
    • 한국자원식물학회:학술대회논문집
    • /
    • 한국자원식물학회 2021년도 춘계학술대회
    • /
    • pp.3-3
    • /
    • 2021
  • The ongoing global pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has not only influenced over 1.26 billion people but also caused 2.77 million deaths worldwide (as of March 28, 2021). The vaccination could be the most efficient strategy to prevent SARS-CoV-2 infection. However, the continuous emergence of novel variants such as VUI-202012/01 (United Kingdom) and 501.V2 (South Africa) raises huge concerns about the effectiveness of the vaccine designed to target the original virus strain. Since ancient times regardless of the East and West, the plants which refered in this presentation have been consumed not only as food but also as a natural medicine to treat diverse diseases including infectious diseases. Importantly, these plants contain secondary metabolites that display antiviral activity involved in the inhibition of viral adsorption, penetration, and replication. Also, plant-derived natural medicines are expected to have a wider range of efficacy and fewer side effects than synthetic medicine, discovering novel plant-based viral agents would be a promising strategy to fight against SARS-CoV-2.

  • PDF