• Title/Summary/Keyword: Single Junction

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A study on design for the $\pi$-junction of a feeder waveguide with an inductive wall using FDTD method (FDTD법을 이용한 유도성벽을 가지는 $\pi$분기 급전도파관의 설계에 관한 연구)

  • 민경식;김광욱;고지원;김동철;임학규
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2000.05a
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    • pp.143-146
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    • 2000
  • This paper presents a study on design for the k-junction of a feeder waveguide with an inductive wall using FDTD method. The feed structure consists of a single waveguide plated on the same layer as radiating waveguide and is characterized by the unit divider, railed a $\pi$-Junction. This $\pi$-Junction with an inductive wall splits part of the power into two branch waveguide through one coupling window, and can excite densely arrayed waveguide at equal phase and amplitude. The power dividing characteristics of a $\pi$ -Junction obtained by FDTD method are compared with one of Galerkin's method of moments. The scattering matrices a $\pi$ -junction calculated by FDTD method are realized.

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Study on Buckling-Characteristics of Single-Layer Latticed Domes subject to Initial Imperfection (II) (Part II In the case of Pinned-Joint) (단층래티스돔의 좌굴특성에 미치는 형상초기부정에 관한 연구 (II) (제II보 핀접합의 경우))

  • 정환목;권영환
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1993.10a
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    • pp.74-78
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    • 1993
  • Compared with rigid-jointed latticed dome, in pinned-joint latticed dome, results of Ref.1 showed reduction of buckling strength by decline of junction's rotational rigidity. Moreover, with decline of junction's rotational rigidity, geometrical initial imperfection incurs more and more reduction of buckling-strength. This study, subsequently the case of rigid-joint domes, is aimed at analyzing buckling-characteristics of pinned-joint single-layer latticed domes with triangular network subjected to initial imperfection.

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Determination of energetically preferable Au-S contact atomic structure in stretched single-molecule junctions

  • Ko, Kwan Ho
    • Proceeding of EDISON Challenge
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    • 2014.03a
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    • pp.409-411
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    • 2014
  • Based on the first-principles computations, the nature of the microscopic geometry of the molecule-electrode contacts was addressed. The single-molecule junction was prepared by connecting hexanediothiolate (HDT) to Au(111) electrodes via one, two, and three Au adatoms having coordination number of one (CN1), two (CN2), and, three (CN3), respectively. The contact atomic structure and energy of the stretched Au-HDT-Au junction was observed. The analysis revealed that the contact geometry with lowest coordination number (CN1) is energetically more stable than CN2 and CN3.

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Spatial Distribution of Injected Charge Carriers in SONOS Memory Cells

  • Kim Byung-Cheul;Seob Sun-Ae
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2006.05a
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    • pp.894-897
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    • 2006
  • Spatial distribution of injected electrons and holes is evaluated by using single-junction charge pumping technique in SONOS(Poly-silicon/Oxide/Nitride/Oxide/Silicon) memory cells. Injected electron are limited to length of ONO(Oxide/Nitride/oxide) region in locally ONO stacked cell, while are spread widely along with channel in fully ONO stacked cell. Hot-holes are trapped into the oxide as well as the ONO stack in locally ONO stacked cell.

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Remedial Junction of Proton Irradiated Single Walled Carbon Nanotubes using Heat Treatment For Solar Energy Harvesting (태양에너지 획득 양성자 조사 단일벽 탄소나노튜브의 열처리에 의한 교정결합)

  • Kim, Tae Gyu;Park, Young Min;Kim, Young Bae;Kim, Dae Weon
    • Journal of the Korean Society for Heat Treatment
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    • v.32 no.1
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    • pp.29-35
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    • 2019
  • The remedial junction is found in the network of single walled carbon nanotubes after the irradiation of protons not only for the better mechanical strength but also for the higher property of electrical conductivity. The irradiated proton formed a beam transferred sufficient energy to change the sp2 structure of atomic carbon as much as damage of crystalline formation, however it is shown the cross bonding while recovery of structure. This improved network in 2-D atomic chain of carbon is expected to use in a critical part in space energy harvesting system related with the solar radiation.

Improvements in Solar Cell Efficiency using a PMMA Concentrator Lens for Indoor Use (실내조명 응용을 위한 투명 집광 렌즈를 이용한 태양전지 효율 향상)

  • Lee, Yoo-Jong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.4
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    • pp.929-934
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    • 2010
  • Improvements in characteristics of a single junction AlGaAs/GaAs solar cell are observed by capping a PMMA lens on it. In order to show the effect of the lens, characteristics of a single junction AlGaAs/GaAs solar cell before and after the lens formation are compared under the one-sun illumination condition ($100mW/cm^2$). Characteristics of the solar cell under very weak illumination condition (about 1200 lux) is also measured with the lighting of a fluorescent desk lamp. About 5% of cell efficiency is improved after the capping of PMMA lens on the single junction AlGaAs solar cell and $83\;{\mu}m/cm^2$ of electrical power was generated with the lighting of a desk lamp.

Single-Electron Pass-Transistor Logic with Multiple Tunnel Junctions and Its Hybrid Circuit with MOSFETs

  • Cho, Young-Kyun;Jeong, Yoon-Ha
    • ETRI Journal
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    • v.26 no.6
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    • pp.669-672
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    • 2004
  • To improve the operation error caused by the thermal fluctuation of electrons, we propose a novel single-electron pass-transistor logic circuit employing a multiple-tunnel junction (MTJ) scheme and modulate a parameters of an MTJ single-electron tunneling device (SETD) such as the number of tunnel junctions, tunnel resistance, and voltage gain. The operation of a 3-MTJ inverter circuit is simulated at 15 K with parameters $C_g=C_T=C_{clk}=1\;aF,\;R_T=5\;M{\Omega},\;V_{clk}=40\;mV$, and $V_{in}=20\;mV$. Using the SETD/MOSFET hybrid circuit, the charge state output of the proposed MTJ-SETD logic is successfully translated to the voltage state logic.

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Numerical Analysis of Flow Interference at Discontinuity Junction of fracture Network (단열교차점에서 유체간섭에 관한 수치적 고찰)

  • 박영진;이강근;이승구
    • Journal of the Korean Society of Groundwater Environment
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    • v.4 no.3
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    • pp.111-115
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    • 1997
  • Discrete fracture model has become one of the alternatives for the classical continuum model to simulate the irregular aspects of the fluid flow and the solute transport in fractured rocks. It is based on the assumptions that the discharge in a single fracture is proportional to the cube of the aperture and the fractured rock can be represented by the statistical assemblage of such single fractures. This study is intended to evaluate the effect of the fracture junction on the cubic law. Numerical solution of flow in junction system was obtained by using the Boundary-Fitted Coordinate System (BFCS) method. Results with different intersection angles in crossing fractures show that the geometry of the junction affects the discharge pattern under the same simulation conditions. Therefore, strict numerical and experimental examinations on this subject are required.

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