• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.703-706
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• 2004

This paper deals with the various sealing conditions in a vacuum and the discharge characteristics. The MgO thin film is prepared by e-beam evaporation method. Sealing process was performed in a vacuum at panel temperature of 430 $^{\circ}C$. We find the cracks on the MgO film surface, which results in higher discharge voltage and lower luminous efficiency. The vacuum in-line sealing technology does not require additional annealing process but induces the MgO cracks because of the high temperature sealing cycle in a vacuum. Therefore we modify the vacuum in-line sealing cycle which the MgO cracks are not found and the good characteristics of plasma displays are found in higher sealing pressure at sealing temperature of 430 $^{\circ}C$.

• 천문학회지
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• 제36권spc1호
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• pp.49-54
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• 2003

We introduce the two-dimensional spectral observations of solar flares using the Solar Tower Tele-scope of Nanjing University, China. In particular, we introduce three typical events and the methods used to analyze the data. (1) The flare of November 11, 1998, which is a limb flare. We derive the temperature and density within the flaring loop using non-LTE calculations. The results show that the loop top may be hotter and denser than other parts of the loop, which may be a result of magnetic reconnect ion above the loop. (2) The flare of March 10, 2001, which is a white-light flare that shows an emission enhancement at the near infrared continuum. We propose a model of non-thermal electron beam heating plus backwarming to interpret the observations. (3) The flare of September 29, 2002, which shows unusual line asymmetries at one flare kernel. The line asymmetries are caused by an upward moving plasma that is accelerated and heated during the flare development.

• 한국군사과학기술학회지
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• 제12권3호
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• pp.360-367
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• 2009

본 논문에서는 위상배열시스템에 적용 가능한 RADANT 위상 스캐닝 개념과 전송선 타입의 부하선로(Loaded Line) 위상변위기 개념에 대하여 고찰하고, 이 두가지 개념을 결합시켜 전자적으로 빔 조향이 가능한 새로운 형태의 RADANT 렌즈를 설계하기 위한 이론적 방법을 제시한다. 제시된 이론적 방법은 간단한 회로 시뮬레이션 결과를 통하여 RADANT 렌즈의 구현 가능성이 확인되었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.568-574
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• 2004

On-line phase tracking of an extrinsic Fabry-Perot interferometer (EFPI) and experimental vibration control of a composite beam with a sensing-patch are investigated. We propose a sensing-patch for the compensation of the interferometric non-linearity. In this paper, a sensing-patch that comprises an EFPI and a piezo ceramic(PZT) is fabricated and the characteristics of the sensing-patch are experimentally investigated. A simple and practical logic is applied for the real-time tracking of optical phase of an interferometer. Experimental results show that the proposed sensing-patch does not have the non-linear behavior of conventional EFPI and hysteresis of piezoelectric material. Moreover, it has good strain resolution and wide dynamic sensing range. Finally, the vibration control with the developed sensing-patch has been performed using Fuzzy logic controller, and the possibility of sensing-patch as a sensoriactuator is considered.

• 한국레이저가공학회지
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• 제15권4호
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• pp.16-19
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• 2012

Due to the fact that the dimensions of circuit lines of IC substrates have been forecast to reduce rapidly, engraving the circuit line patterns with laser has emerged as a promising alternative. To engrave circuit line patterns in an IC substrate, we used a projection ablation technique in which a metal (INVAR) mask and a DPSS UV laser instead of an excimer laser are used. Results showed that the circuit line patterns engraved in the IC substrate have a width of about 15um and a depth of $13{\mu}m$. This indicates that the projection ablation with a metal mask and a DPSS UV laser could feasibly replace the semi-additive process (SAP).

• 한국광학회지
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• 제6권4호
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• pp.317-323
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• 1995

선폭 축소된 반도체 레이저를 이용하여 루비듐 원자의 $D_{2}$ 전이선에 대해 도플러 효과가 제거된 편광분광을 실시하고 광펌핑 편광 분광 이론과 비교하였다. 펌프광이 충분히 약했을 때 실험에서 얻어진 분산모양의 스펙트럼은 단일 주기 광펌핑 이론과 잘 일치하였다. 또한 편광 분광 신호를 직접 오차신호로 사용하여 공진기 길이를 보상한 결과, 주파수 변조를 하지 않고서도 레이저 주파수를 원자의 초미세 전이선에 안정화시킬 수 있었다.

• 기술사
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• 제16권4호
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• pp.4-14
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• 1983

when one is designing a continuous bridge with variable cross sections, it is very troublesome to integrate explicitly load terms and various factor under consideration so that it has different moment of inertia at each cross section. In this paper to obtain the influence line of a arbitary-span continuous beam with variable cross sections, the value of some particular function due to a load at any point can be carried out by numerical integration instead of definite integral. The ordinate of the influence line equals the product of the magnitude of the final moment at each support due to unit moment at any support and the load terms due to unit load, measured at the point of application of the load. It is concluded that this method can be easily used to design continuous bridges with arbitary cross sections.

• 한국군사과학기술학회지
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• 제6권2호
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• pp.55-64
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• 2003

Underwater acoustic noise measurement is an essential element for vulnerability assessment of modern naval platforms. But during the last few decades environmental conditions have drastically changed due to the gradually increasing sea ambient noise level and decreasing submarine radiated noise level. A real-time underwater acoustic measurement system with vertical line array is designed for the quiet submarine radiated noise assessment in challenging environment. This system has a constant directivity index in measurement frequency range and accurate tracking capability for the transmission loss compensation and navigation aids inside the submarine. This system has been validated at sea and used several times for the submarine noise measurement.

• Geomechanics and Engineering
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• 제30권4호
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• pp.353-362
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• 2022

The seismic failure-prone region in Istanbul has been examined in terms of the segmented pipelines. Although some researchers have suggested that this territory should be left as a green land, many people continue to live in this area. This region is about 9-10 km away from the North Anatolian Fault Line. This fault zone is an active right-lateral strike-slip fault line in Turkey and an earthquake with a magnitude of 7.0-7.5 is expected in the Marmara Sea. Therefore, superstructures and infrastructures are under both land sliding risks and seismic risks in this area. Because there are not any pipeline-fault line intersection points in the region, in this study, it has been focused on the behaviors of the segmented (sewage or stormwater) pipelines subject to earthquake-induced permanent ground deformation and seismic wave propagation. Based on the elastic beam theory some necessary analyses have been carried out and obtained results of this approximation have been examined.

• 한국산학기술학회논문지
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• 제19권10호
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• pp.346-351
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• 2018

금속 3D 프린팅 기술은 레이저 빔의 초점에 금속분말을 주입하는 방식에 따라 대표적으로 PBF(Powder Bed Fusion)방식과 DED(Direct Energy Deposition)방식으로 나뉜다. DED 방식은 금속 분말 도포와 동시에 레이저를 조사하여 3차원 구조물을 제작하는 금속 3D 프린팅 기술이고, PBF 방식은 일정 높이로 3차원 그래픽을 슬라이싱 한 후 한 층씩 금속 분말을 적층하여 레이저를 이용해 3차원 구조물을 제조하는 방식이다. DED 방식을 사용하면 레이저 클래딩, 금속 용접 등에는 강점을 가지지만 3D 형상을 제작할 경우 밀도가 낮아지는 문제점이 발생한다. DED 방식에서의 구조체 밀도 문제를 해결하기 위해 PBF 방식을 도입하면 상대적으로 밀도가 높은 3차원 구조물을 제작하는데 용이하다. 본 논문에서는 갈바노 스캐너와 광섬유로 전송되는 Nd:YAG 레이저 빔을 이용한 약 $30{\mu}m$ 크기의 스테인리스 강 분말을 이용하는 PBF 방식의 3차원 프린터를 제작하고, 이를 이용하여 얇은 금속 구조물을 제작하였다. 또한 레이저의 조사 횟수, 출력, 초점 크기, 스캐닝 속도에 따른 선폭의 최적조건을 찾았으며, 그 결과 최적 조건은 레이저 조사 횟수 2회, 출력 30 W, 초점 크기 $28.7{\mu}m$, 스캐닝 속도 200 mm/s에서 최소 선폭은 약 $85.3{\mu}m$로 측정되었다.