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Design of a Small-scaled Superconducting LSM for the Very High Speed Railway Vehicle (레일방식 초고속열차 추진용 축소 초전도 LSM 설계 연구)

  • Park, Chan-Bae;Kim, Jae-Hee;Lss, Byung-Song
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.11
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    • pp.1602-1607
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    • 2014
  • This paper deals with the design and property analysis of 7kW-class small-scaled superconducting Linear Synchronous Motor (LSM) and testing equipment for a number of performance pre-tests prior to the development of coreless-type superconducting LSM suitable for 600km/h very high speed train. First, the basic design and property analysis are conducted before developing a small-scaled superconducting LSM model with 2-pole superconducting electromagnets, and additionally the cost-down design of the superconducting electromagnets is conducted to use less high-Tc superconducting wire. Finally, the superconducting magnet coil span is selected at 120mm, and input ground armature current of 670Aturns is required to produce 44.7N of thrust based on research findings.

Development of a Multiplex PCR for Discrimination of the TLC:RS1:CTX array of Vibrio cholerae Wave 3 El Tor Strains

  • Kim, Eun Jin;Yu, Hyun Jin;Nair, G. Balakrish;Kim, Dong Wook
    • Journal of Microbiology and Biotechnology
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    • v.26 no.12
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    • pp.2199-2205
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    • 2016
  • Vibrio cholerae O1 serogroup Wave 3 El Tor strains are presently prevalent worldwide. The Wave 3 El Tor strains contain a TLC:RS1:CTX array on chromosome 1, and no element is integrated on chromosome 2. A multiplex PCR optimized to identify the TLC:RS1:CTX array of Wave 3 strains has been developed in this study. By using eight primers, the multiplex PCR can identify the characteristic CTX and RS1 array of Wave 3 strains from various arrays of strains belonging to other Waves. The four amplified DNA fragments of Wave 3 strains have been cloned in a vector, which could be used as a positive control for the multiplex PCR. This multiplex PCR and the positive control set could be useful tools for rapid recognition of Wave 3 El Tor strains.

Analysis on the shift characteristic of the rainfall (강우 자료의 변동 특성 분석)

  • Oh, Je-Seung;Kim, Chi-Young;Kim, Won
    • Proceedings of the Korea Water Resources Association Conference
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    • 2007.05a
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    • pp.1602-1607
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    • 2007
  • 본 연구에서는 국내 61개 지점의 강우자료를 사용하여 게릴라성 호우 및 국지성 호우가 빈번하게 발생하기 시작한 1998년을 기준으로 강우의 변동 특성을 분석하고자 하였다. 분석은 두 가지 방법으로 수행하였으며 우선, 지속시간별 초과 강우의 발생 횟수를 산정하여 분석하였다. 또한, 각 지점의 연도별 10분, 1시간, 1일 최대 강우량을 산정하여 변동성 분석을 수행하였다. 분석 기법으로는 WMO에서 2000년도에 제시한 경향성 및 변동성 분석 기법을 사용하였다. 분석 결과 지속시간별 초과 횟수의 분석에서는 임의의 초과 시간 기준에 대해 모든 지속시간에서의 변동성이 통계적으로 유의성을 나타내었으며, 이는 각각의 지속시간에 대해 일정 규모이상의 강우가 발생하는 횟수가 과거에 비해 증가하였음을 의미한다. 최대 강우량을 사용한 분석에서도 이러한 변동성이 확인 되었다. 기간이 짧은 10분 최대 강우량에서만 변동성을 가진 지점은 3개 지점 이었지만, 1시간 및 일 최대 강우량 값은 61개 지점 중 30개 지점에서의 변동성이 유의한 것으로 나타났다. 본연구를 통하여 대규모 강우의 발생 횟수 및 단기간 강우량이 98년을 시점으로 한 변동성을 가지고 있음을 알 수 있었다.

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Dependencies of Dielectric Properties on Frequency and Temperature in Different Interfaces (이종계면에서의 주파수 및 온도 변화에 따른 유전특성)

  • Kang, Dae-Yong;Wu, Guangning;Lee, Jong-Bok;Han, Sang-Ok;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 1998.07e
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    • pp.1605-1607
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    • 1998
  • In this paper, specimens which have the structure of Insulator/Insulator/Insulator and Insulator/Semiconductor /Insulator were experimented using insulating material of Polyethylene Terephthalate(PET). The dependency of permitivity, $tan{\delta}$ and conductance on frequency and temperature were investigated. Both of the specimens showed the trend of decrease in permitivity as the temperature increased but increase as the frequency increased. $tan{\delta}$ of both specimens showed increase with the increase of frequency. With the temperature, $tan{\delta}$ showed slight decrease by $60^{\circ}C$ and increase over $80^{\circ}C$.

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The Inhibitory Effect of Gut Microbiota and Its Metabolites on Colorectal Cancer

  • Chen, Chao;Li, Huajun
    • Journal of Microbiology and Biotechnology
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    • v.30 no.11
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    • pp.1607-1613
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    • 2020
  • Colorectal cancer (CRC) is regarded as one of the most common and deadly forms of cancer. Gut microbiota is vital to retain and promote several functions of intestinal. Although previous researches have shown that some gut microbiota have the abilities to inhibit tumorigenesis and prevent cancer from progressing, they have not yet clearly identified associative mechanisms. This review not only concentrates on the antitumor effects of metabolites produced by gut microbiota, for example, SCFA, ferrichrome, urolithins, equol and conjugated linoleic acids, but also the molecules which constituted the bacterial cell wall have the antitumor effect in the host, including lipopolysaccharide, lipoteichoic acid, β-glucans and peptidoglycan. The aim of our review is to develop a possible therapeutic method, which use the products of gut microbiota metabolism or gut microbiota constituents to help treat or prevent colorectal cancer.

DBAH operator and fuzzy reasoning of thresholds for extracting sketch features (스케치특징 추출을 위한 DBAH 연산자와 임계치의 퍼지추론)

  • Jo, Seong-Mok
    • The Transactions of the Korea Information Processing Society
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    • v.3 no.6
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    • pp.1607-1615
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    • 1996
  • A new simply computable operator named DBAH(difference between arithmetic mean and mean)and fuzzy reasoning technique of local thresholds for extracting sketch features are proposed in this paper.The DBAH operator provides some advantages, for example dependence on local intensities and small reponses with small rates of intensity change in very dark regions. Also, the proposed fuzzy reasoning technique has a good performance extracting sketch features without human intervention.

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An XPath Query Processing System based on JXTA (JXTA 기반의 XPath 질의 처리 시스템)

  • Lee, Ji-Hun;Sohn, Ki-Rack
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.05c
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    • pp.1607-1610
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    • 2003
  • 최근 MP3 저작권에 대한 찬반 논란이 계속 되면서, 기존의 클라이언트-서버가 아닌 Peer-To-Peer(P2P) 기반의 데이터 검색 시스템에 관한 여러 연구가 활발히 진행되고 있다. 하지만. 검색 방법에 있어서는 단순히 파일이름을 이용한 데이터 검색 방법이 주류를 이루고 있는데 본 논문에서는 검색을 위한 문서 정보를 XML 형태로 저장하고, 구조적인 검색을 용이하게 하기 위해 DOM(Document Object Model)을 이용하여 XML 문서를 트리 형태로 구성한 후 P2P 네트워킹 플랫폼인 JXTA를 기반으로 XPath 질의를 수행함으로써 P2P 네트워크 기반에서 구조적 검색이 가능한 시스템을 구현하였다.

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Design of BiCMOS Log-Domain Filters for Low-Voltage and Low-Power (저전압, 저전력 BiCMOS 로그 도메인 필터 설계)

  • Ahn, Na-Young;Woo, Young-Shin;Sung, Man-Young
    • Proceedings of the KIEE Conference
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    • 2000.07c
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    • pp.1605-1607
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    • 2000
  • In this paper, the design of class AB BiCMOS log-domain filter for low-voltage and low-power was proposed. This filter is consist of a log-domain integrator using folded junctions with capacitor connected to emitter and it's class AB structure. A comparison between the proposed class AB BiCMOS log-domain filter and classical class A BiCMOS log-domain filter is drawn on the basis of SNR, THD and the frequency response. This comparison shows proposed filter are more than good SNR, THD and frequency characteristics than more class A log-domain filter for low voltage and low power.

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Dynamic Analysis on the Closing Resistors of Gas Insulated Switchgear

  • Cho Hae-Yong;Lee Sung-Ho;Lim Sung-Sam
    • Journal of Mechanical Science and Technology
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    • v.20 no.10
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    • pp.1607-1613
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    • 2006
  • GIS (Gas Insulated Switchgear) is used in electric power system to insure non conductivity, breaking capacity and operating reliability. In the present study, dynamic analysis on the closing resistors of the GIS has bees carried out by the commercial dynamic analysis code COSMOS MOTION and 3-D modeling program SOLID WORKS. In order to find the minimum value of chatter vibration of closing resistors, the motion of moving and fixed resistor parts of closing resistors were simulated by varying the spring constant, the damping coefficient and the mass of moving and fixed resistor parts. The simulated results were compared with experimental results. The application of the results could reduce chatter vibration of closing resistors of the GIS. These data are also useful on the development of future model GIS with minimum chatter vibration for the determinations of the spring constant, the damping coefficient and mass of a moving part.

임란 후 통신사선의 항로와 항해

  • Kim, Ju-Sik;Kim, So-Hyeong;Kim, Seong-Jun
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.05a
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    • pp.122-125
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    • 2018
  • 조선은 개국 이후 일본과의 교린정책을 위해 막부의 요청에 따라 총 20차례 통신사를 파견하였다. 그 동안 우리 학계에서는 통신사행과 관련한 제도와 문학, 문화교류, 통신사선의 건조, 상호간의 인식, 외교와 의례, 영접 등을 중심으로 연구가 이루어져 왔고, 통신사행의 이동경로인 항로와 항해에 대해서는 상대적으로 연구가 미진하였다. 본 연구는 임란 후 1607년부터 1763년까지 일본에 파견된 12차례 통신사행의 해상항로와 항해에 대해 현지답사와 사료를 중심으로 분석한 것이다. 이 연구는 통신사선의 항로와 항해에 대한 최초의 학술연구로서 통신사행에 대한 연구의 질과 폭을 넓히는 계기가 될 것이고, 해양사적으로는 한선의 항해술을 이해하는 단초가 될 것이다. 그러나 항해의 실체에 대해서는 통신사선의 사공과 격군이 남긴 사료가 전무하여 구체적으로 밝히는 데는 한계가 있었다. 이는 차후 연구를 통해 보완할 필요가 있다.

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