• 제목/요약/키워드: Chun-Kwang

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WiFi P2P 기술의 GO선정을 고려한 어플리케이션개발 (The development of application in WiFi P2P for select proper GO)

  • 노태완;이재웅;천보현;박인혜;이형근
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2012년도 추계학술대회
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    • pp.7-10
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    • 2012
  • 본 논문에서는 AP 없이도 직접 단말 간 통신이 가능한 Wi-Fi Direct 기술에서, 다중 사용자 연결을 고려해 GO를 선정하도록 하는 방법에 대해 연구하고 해당 방법을 적용한 어플리케이션을 개발하였다. 제안하는 방법은 GO 선정 횟수와 누적 저장된 과거 P2P 연결에 대한 정보에 가중치를 적용하여 P2P 그룹 연결 도중에 다른 단말로부터의 연결 요청이 있을 가능성이 높은 단말을 GO로 선정하도록 하였다. 본 문에 나타난 방법을 통해 실제 구현한 어플리케이션이 GO를 제대로 선정함을 확인하였다.

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修正된 아자이드 Winkler 법과 폴라로그래피에 의한 溶存酸素의 측정에 관한 하이드록실아민의 영향 (Hydroxylamine Effect on the Determination of Dissolved Oxygen by the Azide-Modified Winkler Method and Polarography)

  • Chung, Keun Ho;Ree, Jony Iuir;Kim, Chun Seek
    • 한국환경보건학회지
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    • 제12권2호
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    • pp.11-15
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    • 1986
  • Hydroxlamine effect on the determination of dissolved oxygen by the azide-modified Winkder method and polarography has been studied. It was found that hydroxylamine interference on the dissolved oxygen by the azide-modified Winklet method can be eliminated completely by using permanganate. An inexpensive and convenient polarograph device was constructed. Dissolved oxygen in an air-saturated 0.1 F KCl solution undergoes, independent of hydroxylamine concentrations a two-step irreversible reduction at the dropping electrode the $H_2O_2$ produced in the first step is reduced to $H_2$O in the second. Two waves of equal size result, the first with a half-wave potential (E1/2) at about -0.13 V and the second at about -0.91 V (vs. SCE).

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Electrochemical Study on the Coumarin Derivatives

  • Kim, Il Kwang;Chun, Hyun Ja;Paik, Soon Ok;Park, Sung Woo
    • 분석과학
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    • 제8권4호
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    • pp.655-661
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    • 1995
  • The electrochemical reduction of coumarin derivatives in 0.1M TEAP acetonitrile solution was investigated by the direct current, differential pulse polarography, cyclic voltammetry and controlled potential coulometry. The electrochemical reduction of 7-acetoxy-4-bromomethyl-coumarin(ABMC) was proceeded as an irreversible three steps(-0.58, -1.63 and -2.25 volts) of electrochemical transfer before chemical reaction. The solution color turned to yellow after the carboxyl group was reduced at 2nd step(-1.63 volts vs. Ag-AgCl) and the change in color was independant to the bromo group. Upon the basis of the results on the products analysis and the interpretaton of polarograms, a possible electrochemical reaction mechanism was suggested.

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다변수시스템의 상태식별과 제어를 위한 안정한 적응구조의 설계 (A Adaptive Scheme design for Identification and Control of multivariable Systems)

  • 김석겸;전상영;임화영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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    • pp.69-72
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    • 1987
  • General schemes for the adaptive control and identification of multivariable systems by model reference approach are developed. Lyapunov's direct method and LaSalle's theorem are employed to ensure the stability of these schemes. An added feature is the simplicity of the stable adaptive laws, which depend explicitly on the state variables of plant and model, and on the plant input. Computer simulation results of several examples illustrate the the effectiveness of the proposed schemes.

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