• 한국산학기술학회논문지
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• 제19권11호
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• pp.224-229
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• 2018

우리나라는 급격한 경제발전으로 전력소비량이 크게 증가하고 있으며, 원활한 전력의 공급을 위해 많은 송전탑 및 송전선이 설치되고 있다. 고압 송전선은 주로 알루미늄 연선으로 제작되며, 전선을 느슨하게 가선하여 약간의 처짐이 유지되도록 하고 있다. 처짐의 정도는 공사의 품질과 전선의 수명에 많은 영향을 끼치게 되는데 시간이 지날수록 전선의 무게나 주변 환경적 요인으로 수축과 팽창이 반복적으로 일어나므로 송전선의 관리를 위해 주기적인 모니터링이 필수적이다. 본 연구에서는 3D 레이저 스캐닝 기술을 활용하여 송전선에 대한 모니터링을 수행하였다. 연구대상지의 송전선에 대한 데이터를 취득하고, 자료처리를 통해 송전선에 대한 포인트클라우드 형태의 3차원 공간정보를 추출하였다. 송전선에 대한 3차원 공간정보를 활용하여 송전선의 길이와 처짐량을 산출하였으며, 주변 장애물들과의 이격거리를 효과적으로 산출할 수 있었다. 연구를 통해 송전선 관리를 위한 3D 레이저 스캐닝 기술의 활용성을 제시할 수 있었으며, 향후 추가적인 연구를 통해 3D 레이저 스캐닝 기술이 적용된 송전선 모니터링 방안이 개발된다면 송전선 관리의 효율성 증대에 크게 기여할 것이다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 1999년도 제19회 KOSCO SYMPOSIUM 논문집
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• pp.55-61
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• 1999

A convolution algorithm combined with Fourier transformation is applied to the tomographic reconstruction of the asymmetric soot structure to identify the local soot volume fraction distribution. The line of sight integrated data from light extinction measurement with multi-angular scanning form basic information for the deconvolution. Multi-peak following interpolation technique is applied to obtain the effect of increasing number of scanning angles. Measurement of LII signal for the same flame shows the validity of this reconstruction technigue.

• 한국연소학회지
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• 제8권3호
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• pp.24-30
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• 2003

A convolution algorithm combined with Fourier transformation has been applied to the tomographic reconstruction of asymmetric soot structure to identify the local soot volume fraction distribution. Line-of-sight integrated data from light extinction measurement with multi-angular scanning formed basic information for the deconvolution. Multi-peak following interpolation technique was applied to obtain the effect of increasing number of scanning angles. Height-by-height reconstructed soot volume fraction distribution was compared with laser-induced incandescence signals.

• 한국정보통신학회논문지
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• 제9권4호
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• pp.861-864
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• 2005

광위상변조기를 이용하여 OCT용 초고속 광지연단을 설계하고 수치해석을 수행하였다. 수치해석은 electro-optic 위상 변조기에 1310nm, 10ps의 펄스폭을 갖는 레이저 광원을 적용하여 수행하였다. 수치해석결과로 500MHz의 변조 주파수일때 19ps의 시간 지연을 얻었으며, 이는 기존의 기계적 검출 방식(수십kHz)의 OCT장치에 비해 1000배이상 빠른 검출이 가능할 것으로 예상된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 C
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• pp.1160-1163
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• 1999

In this study, we developed FE-tip lithography system that could apply to multi-tip system and did lithography using FE-tip. The software that control FE-tip lithography system, was proposed for acquiring more adaptive data to compensate the effect of fluctuation. We found that the fluctuation effect was reduced. The minimum line width was related to applied voltage and we observed a movement of Z-axis piezo stage to correct the error of this system. When FE current was 5nA, scanning speed was $3{\mu}m/sec$ and applied voltage was 200V, we made a line pattern which had minimum line width of 614 nm. If we reduce applied voltage to several decades and increase scanning speed to $20{\mu}m/sec$, it is possible to set the minimum line width of 100 nm. The proposed system can be easily applied to multi FE-tip lithography system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.275-276
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• 2007

본 논문에서는 AC-PDP내에서 고화질의 영상을 표현하고자한다. PDP구동방법중의 하나인 ADS방식을 보면 Reset, Address, Sustain의 세부분으로 나뉜다. 이 같은 ADS구동에 있어서 각 구간마다 제안된 시간을 이용한다. Reset구간에서는 각각의 Call을 균일하게 하고, Address구간에서는 Call의 On/off를 결정한다. Sustain구간 선택된 셀을 나타낸다. 이 같은 ADS방식에서 Addressing방법에서 Line-by-Line Scanning을 방법을 이용한다. 라인을 순차적으로 스캔함으로써 시간이 일정해진다. 라인의 순서를 홀수라인과 짝수라인으로 구분하여 각각의 라인에서 생기는 준비기간 동안 시간을 중복으로 사용함으로서 어드레싱시간을 감소시킬 수 있다 이를 구현하기 위해서 interlaced Line-by-Line Scanning을 이용한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.713-716
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• 2000

In this study, we present a mobile robot for ultrasonic scanning of weldment. magnetic Caterpillar mechanism is selected in order to travel on the inclined surface and vertical wall. A motion control board and motor driver are developed to control four DC-servo motors. A virtual device driver is also developed for the purpose of communicating between the control board and a host PC with Dual 'port ram. To provide the mobile robot with stable and accurate movement, PID control algorithm is applied to the mobile robot control. And a vision system for detecting the weld-line are developed with laser slit beam as a light source. In the experiments, movement of the mobile robot is tested inclined on a surface and a vertical wall.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.405-409
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• 1997

Voronoi diagrams are applied in varios field such as NC toolpath generation, VLSI design and robot path planning because of their geometric charcteristics. In this paper, Voronoi diagrams are introduced on polygon constructed by line segments only and with constant offset. Bisector curves for two arbitrary objects, which is the combination of line segment and arc, are defined as parametric fuction where the parameter is used as offset. Offset curves are applied on the generation of laser scanning path for the stereolithography and shows a good result from several examples.

• 대한기계학회논문집A
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• 제26권6호
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• pp.1159-1168
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• 2002

Power-transmission Nylon pinions against steel gears fur different pitch line velocities was studied with a power circulating gear test rig under unlubricated condition by SEM(Scanning Electron Microscope). The wear characteristics of Nylon pinions varied significantly with the pitch line velocity and applied load. Wear occurred most severely at the regions including pitch circle and root circle of Nylon pinions. It is confirmed that Nylon pinions are able to be used fer power-transmission under limited conditions.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.123.1-123
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• 2001

For Autonomous navigation of the mobile robots, the robots' capability to recognize 3D environment is necessary. In this paper, an on-line 3D map building method for autonomous mobile robots is proposed. To get range data on the environment, we use an sensor system which is composed of a structured light and a CCD camera based on optimal triangulation. The structured laser is projected as a horizontal strip on the scene. The sensor system can rotate $\pm$ $30{\Circ}$ with a goniometer. Scanning the system, we get the laser strip image for the environments and update planes composing the environment by some image processing steps. From the laser strip on the captured image, we find a center point of each column, and make line segments through blobbing these center poings. Then, the planes of the environments are updated. These steps are done on-line in scanning phase. With the proposed method, we can efficiently get a 3D map about the structured environment.