• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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• pp.167-169
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• 2002

Selective, highly stable determination of serotonin was achieved in cyclic voltammetric measurement carried out at electrochemically treated conductive boron-doped diamond electrode. Boron-doped diamond electrodes were prepared on single crystal Si wafers by microwave plasma chemical vapor deposition and $B_2O_3$ was dissolved in acetone/methanol(9:1) mixture solution so that the B/C weight ratio ca. $10^4ppm$. Serotonin is a kind of indoleamines, which secreted from adrenal marrow cells. The serious problem to detection of serotonin is the interference phenomena of electroactive constituent, including AA. In this study, electrochemical treatment of HDD was carried out to discriminate between serotonin and AA responses. Experimental results showed that the peak potential of AA oxidation shift to the positive direction and the oxidation peak of serotonin was unchanged.

• 전자통신동향분석
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• 제36권3호
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• pp.87-96
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• 2021

Quantum computers will be a game-changer in various fields, such as cryptography and new materials. Quantum computer is quite different from the classical computer by using quantum-mechanical phenomena, such as superposition, entanglement, and interference. The main components of a quantum computer can be divided into quantum-algorithm, quantum-classical control interface, and quantum processor. Universal quantum computing, which can be applied in various industries, is expected to have more than millions of qubits with high enough gate accuracy. Currently, It uses general-purpose electronic equipment, which is placed in a rack, at room temperature to make electronic signals that control qubits. However, implementing a universal quantum computer with a low error rate requires a lot of qubits demands the change of the current control system to be an integrated and miniaturized system that can be operated at low temperatures. In this study, we explore the fundamental units of the control system, describe the problems and alternatives of the current control system, and discuss a future quantum control system.

• International Journal of Naval Architecture and Ocean Engineering
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• 제13권1호
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• pp.526-544
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• 2021

Based on the potential flow theory, a fully nonlinear numerical procedure is developed with boundary element method to analyze the interaction between a fixed semi-submersible platform and incident waves in open water. The incident wave is separated from the scattered wave under fully nonlinear boundary conditions. The mixed Euler-Lagrangian method is used to capture the position of the disturbed wave surface in local coordinate systems. The wave forces exerted on an inverted conical frustum are used to ensure the accuracy of the present method and good agreements with published results are obtained. The hydrodynamic characteristics of the semi-submersible platform interacting with regular waves are analyzed. Pressure distribution with time and space, tension and compression of the platform under wave action are investigated. 3D behaviors of wave run-ups are predicted. Strong nonlinear phenomena such as wave upwelling and wave interference are observed and analyzed.

• 한국잠사곤충학회지
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• 제17권2호
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• pp.101-118
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• 1975

가잠에 있어서 세포질 다각체 바이러스의 병원성 및 이형 바이러스 접종에 의한 유발 간섭현상을 구명하기 위하여 현장여품종인 잠103$\times$잠104의 원종과 교잡종에 있어서 육각형 및 사각형 세포질다각체 바이러스의 병원성 이형 세포질다각체 바이러스 접종에 의한 잠재성 바이러스의 활성화 및 활성화된 세포질다각체 바이러스와 접종한 세포질다각체 바이러스 사이의 간섭현상을 조사한 결과는 다음과 같다. 1. 세포질다각체 바이러스의 병원성 1) 가잠의 원종 (잠103, 잠104) 및 교잡종(잠103$\times$잠104)에 있어서 육각형 세포질다각체 바이러스의 병원성은 상호간에 고도의 유의성이 있어 교잡종이 가장 낮은 발병률을 보였고 일본종이 중간을 나타냈으며 중국종이 가장 높은 발병률을 보였다. 사각형 세포질다각체 바이러스에서도 유의성을 나타내어 있었으나 교잡종과 일본종이 같은 수준이고, 일본종과 중국종이 같은 수준이었으며, 교잡종과 중국종 사이에는 유의성이 있었다. 2) 접종령기에 따르는 병원성은 육각형 및 사각형 세포질다각체 바이러스가 다같이 고도의 유의성이 있었으며 2령기잠의 접종이 4령기잠이 접종보다 발병률이 높았다. 3) 접종된 병원체의 농도에 있어서 육각형 및 사각형 세포질다각체 바이러스의 병원성은 다같이 고도의 유의성이 있었으며, 농도가 높을수록 병원성이 높았다. 2. 이형 바이러스 접종에 의한 유발 및 간섭현상 1) 원종 및 교잡종에 있어서는 교잡종보다 원종에서 유발률이 높았으며 원종에서는 일본종보다 중국종에서 유발률이 높았다. 2) 접종 령기에 있어서는 2령기잠 접종이 4령기잠 접종보다 유발률이 높았다. 3) 사각형 세포질다각체 바이러스의 경구접종에 의한 육각형 세포질다각체 바이러스이 활성화 정도는 저농도에서 높았으며 고농도에서는 매우 낮았다. 4)육각형 세포질다각체 바이러스의 경구접종에 의한 사각형 세포질다각체 바이러스의 활성화 정도는 저농도에서는 매우 낮았으며 고농도에서는 전혀 나타나지 않았다. 5) 혼합감염은 2령기잠의 접종이 4령기잠의 접종보다 높았으며 4.2$\times$$10^{6}$/ml 농도에서 가장 높았다. 6)2령기잠에 사각형 세포질다각체 바이러스를 접종할 경우 저농도에서는 활성화한 육각형 세포질다각체 바이러스가 접종한 사각형 세포질다각체 바이러스가 활성화한 육각형 세포질다각체 바이러스를 간섭하는 것으로 생각된다. 또한 4.2$\times$$10^{6}$/ml 농도를 중심으로 개체 안에서의 육각형과 사각형 세포질다각체 바이러스 사이의 간섭현상이 평형상태를 이루는 것으로 생각된다.

• 한국전자파학회논문지
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• 제19권2호
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• pp.152-160
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• 2008

본 논문에서는 위상 잡음의 거리 상관 효과에 따른 직접 변환 방식의 UHF 대역 RFID 리더의 성능을 분석한다. UHF RFID 시스템은 일반적 인 무선 통신 방식과는 다르게 송신 캐 리어를 발생하는 LO 신호가 동시에 수신기의 국부 발진기로 사용되며, 이에 따라 태그 신호와 LO 신호 간의 거리 상관 효과에 의한 주기적인 신호 간섭 및 위상 잡음 감소 효과가 발생한다. 주기적인 신호 간섭 효과는 이론 및 시뮬레이션을 통해 I와 Q신호를 I/Q 다이버시티 개념으로 전력 결합함으로써 제거할 수 있음을 확인하였다. 위상 잡음 감소 효과는 전형적인 UHF 대역에서 동작하는 LO의 위상 잡음에 대한 전력 밀도 스펙트럼이 태그-리더 거리 및 옵셋 주파수에 따라 변화됨을 확인하였고, 이를 이용하여 심볼 에러 성능을 시뮬레이션 하였다. 시뮬레이션 결과, 심볼 에러에서 위상 잡음의 영향은 태그 변조 방식 중 PSK에서 특히, 변조 각도가 작을 때 크게 나타나지만, 거리 상관 효과에 의해 실제 위상 잡음이 감소되어 그 영향이 미비해짐을 확인하였다.

• 한국전자파학회논문지
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• 제23권6호
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• pp.716-722
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• 2012

본 논문에서는 WWAN 대역의 노트북 안테나와 LCD 구동 모듈 간의 전자기 간섭이 노트북의 무선 통신에 끼치는 영항을 분석하고, 이러한 간섭을 줄이기 위한 대책을 논의하였다. LCD 구동 모듈에 의한 잡음원을 모의하기 위해 다중 대역 안테나를 설계, 제작하였고, 이를 사용하여 노트북 내에서 전자기 간섭에 의한 효과를 시뮬레이션 및 모델 실험을 통해 분석하였다. 그 결과, 노트북의 구조에 기인한 특정 주파수 대역에서 더 많은 잡음이 전달될 수 있음을 확인하였다. 또한, 구조물 변화에 의한 잡음 전달의 감소를 위해 구조물에 격벽을 세우고, 그 크기를 변경하며 전자기 간섭을 분석하였으며, 이러한 구조 변경이 통신 대역 내의 전자기 간섭을 감소시킬 수 있음을 보여주었다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.140.1-140.1
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• 2015

Currently, As Plasma application is expanded to the industrial and medical industrial, Low temperature plasma characteristics became important. Especially in Medical industrial, Low temperature plasma directly adapted to human skin, so their plasma parameter is important. One of the plasma parameters is electron density, some kinds of method to measuring electron density are Thomson scattering spectroscopy and Millimeter-wave transmission measurement. But most methods is expensive to composed of experiment system. Heterodyne interferometer system is cheap and simple to setting up, So we tried to measuring electron density by Laser heterodyne interferometer. To measuring electron density at atmospheric pressure, we need to obtain the phase shift signal. And we use a heterodyne interferometer. Our guiding laser is Helium-Neon laser which generated 632 nm laser. We set up to chopper which can make a laser signal like a pulse. Chopper can make a 4 kHz chopping. We used Needle jet as Ne plasma sources. Interference pattern is changed by refractive index of electron density. As this refractive index change, phase shift was occurred. Electron density is changed from Townsend discharge's electron bombardment, so we observed phenomena and calculated phase shift. Finally, we measured electron density by refractive index and electron density relationship. The calculated electron density value is approximately 1015~1016 cm-3. And we studied electron density value with voltage.

• 대한조선학회논문집
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• 제44권2호
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• pp.64-73
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• 2007

Turbulent flows around yacht sails were calculated to access the applicability of CFD for yacht design. Multi-block grid system was generated by using Gridgen package and Fluent was used to calculate flows around two sail system. A 30ft class sailing yacht designed and tested by KRISO was chosen. The interference effect between main and jib sails was analyzed. Pressure distribution on the sails was obtained and the center of effort was estimated. It was found that the jib angle affects the flow phenomena around a main sail due to the change of inflow angle. The location of center of effort is much different from the empirical formula based on a simple geometrical consideration. The calculated results are compared with the previous numerical and experimental results. Both CFD results are similar, but there are some discrepancies with experimental data. However, it is certain that CFD can be a very useful tool for yacht design.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.701-704
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• 2005

Aquifer Thermal Energy Storage (ATES) can be a cost-effective and renewable geothermal energy source, depending on site-specific and thermohydraulic conditions. To design an effective ATES system having influenced by groundwater movement, understanding of thermo hydraulic processes is necessary. The heat transfer phenomena for an aquifer heat storage are simulated using FEFLOW with the scenario of heat pump operation with pumping and waste water reinjection in a two layered confined aquifer model. Temperature distribution of the aquifer model is generated, and hydraulic heads and temperature variations are monitored at the both wells during 365 days. The average groundwater velocities are determined with two hydraulic gradient sets according to boundary conditions, and the effect of groundwater flow are shown at the generated thermal distributions of three different depth slices. The generated temperature contour lines at the hydraulic gradient of 0.00 1 are shaped circular, and the center is moved less than 5m to the groundwater flow direction in 365 days simulation period. However at the hydraulic gradient of 0.01, the contour center of the temperature are moved to the end of boundary at each slice and the largest movement is at bottom slice. By the analysis of thermal interference data between two wells the efficiency of the heat pump system model is validated, and the variation of heads is monitored at injection, pumping and no operation mode.

• International Journal of Precision Engineering and Manufacturing
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• 제4권5호
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• pp.41-46
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• 2003

Electronic Speckle Pattern Interferometry (ESPI) has been recently developed and widely used because it has the advantage of being able to measure surface deformations of engineering components and materials in industrial areas without contact. The speckle patterns formed with interference and scattering phenomena can measure not only the out-of-plane but also the in-plane deformations. Digital image equipment processes the information included in the speckle patterns and displays the consequent interferogram on a computer monitor. In this study, the experimental results of a canti-levered plate using ESPI were compared with those obtained from the simple beam theory. The ESPI results of the canti-levered plate, analyzed by 4-step phase shifting method, are close to the theoretical expectation. Similarly, out-of-plane displacements of a spot welded canti-levered plate were also measured by ESPI with 4-step phase shifting technique. The phase map of the spot welded canti-levered plate is quite different from that of the canti-levered plate without spot welding.