• 융합보안논문지
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• 제6권3호
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• pp.37-47
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• 2006

본 논문에서는 필립스사의 지자기센서를 블루투스 통신시스템에 연결하여 방위각을 $5^{\circ}$ 단위로 전후 방향으로 기울기 각도를 변화시켜 $360^{\circ}$를 측정하였다. 측정된 방위값은 100M 이내에서 이동하면서 측정값을 블루투스 통신시스템으로 전송하여 측정값을 분석하였다. 블루투스를 이용하여 전파 장애가 없는 평지에서 직선거리 100M 이내에서 방위 측정값은 에러 없이 전송할 수 있었다. 지자기센서를 수평을 유지하면 98%의 신뢰를 가지는 방위측정값을 얻었다. 본 연구를 바탕으로 기울기를 가지는 지형을 이동하는 이동형 지능로봇에 장착 정확도가 향상된 방위 측정값을 전송하여 이동형 로봇의 방위추적을 할 수 있다.

• 한국정보통신학회논문지
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• 제22권7호
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• pp.1009-1014
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• 2018

본 논문에서는 레이더 센서를 이용하여 센서와 물체 사이의 거리를 측정하는 시스템을 설계하고 구현하였다. 센서 모듈은 센서의 원시 데이터를 거리측정 시스템에 올려주고, 거리 측정 시스템에서는 표준편차와 평균값 필터를 이용하여 객체의 유무를 탐지하였다. 실험 결과에서는 평균값 필터를 이용한 알고리즘이 최대 거리 9.7m에서 최대 오차 0.02m 이내의 오차율로 사람이 측정되는 것을 확인하였으며, 표준편차를 이용한 알고리즘에서는 최대거리 9.7m에서 최대 오차 0.15m 이내의 오차율로 사람이 측정되는 것을 확인하였다. 따라서, 레이더 센서를 이용하여 거리를 측정할 경우, 표준편차를 이용한 방법보다는 평균값 필터를 이용하는 방법이 객체 탐지의 정확도가 높음을 확인하였다.

• 전자공학회논문지B
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• 제33B권4호
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• pp.174-182
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• 1996

In continuous speech recognition system, it is possible to implement the system which can handle unlimited number of words by using limited number of phonetic units such as phonemes. Dividing continuous speech into the string of tems of phonemes prior to recognition process can lower the complexity of the system. But because of the coarticulations between neiboring phonemes, it is very difficult ot extract exactly their boundaries. In this paper, we propose the algorithm ot extract short terms which can represent each phonemes instead of extracting their boundaries. The short terms of lower spectral change and higher spectral chang eare detcted. Then phoneme changes are detected using distance measure with this lower spectral change terms, and hgher spectral change terms are regarded as transition terms or short phoneme terms. Finally lower spectral change terms and the mid-term of higher spectral change terms are regarded s the represent each phonemes. The cepstral coefficients and weighted cepstral distance are used for speech feature and measuring the distance because of less computational complexity, and the speech data used in this experimetn was recoreded at silent and ordinary in-dorr environment. Through the experimental results, the proposed algorithm showed higher performance with less computational complexity comparing with the conventional segmetnation algorithms and it can be applied usefully in phoneme-based continuous speech recognition.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.357-358
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• 2006

Accurate calibration matching for maladjusted stereo cameras with calibrated pixel distance parameter is presented. The camera calibration is a necessary procedure for stereo vision-based depth computation. Intra and extra parameters should be obtain to determine the relation between image and world coordination through experiment. One difficulty is in camera alignment for parallel installation: placing two CCD arrays in a plane. No effective methods for such alignment have been presented before. Some amount of depth error caused from such non-parallel installation of cameras is inevitable. If the pixel distance parameter which is one of Intra parameter is calibrated with known points, such error can be compensated in some amount and showed the variable experiments for accurate effects.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.53.5-53
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• 2001

In continuous galvanizing process at steel making plant, coating weight on the surface of strip that pass through air knife is controlled by the pressure at the chamber of air knife and the gap between the nozzle of air knife and strip. The pressure can be easily measured and controlled. But it is difficult to measure the distance between Air knife nozzle and strip, and also difficult to decide how much distance air knife move. Because, the gap between nozzle and strip varies with the height of air knife, intermesh of stabilizing roll and welding of strips that have different thickness. In this research, we developed a gap sensor that can measure the relative distance between Air knife nozzle and strip. And several tests are performed to find optimal condition for application at real plant. We performed test in which the possibility of the sensor to apply ...

• 한국항해항만학회지
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• 제32권6호
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• pp.439-445
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• 2008

실습선 한바다호에 설치된 선박 조종성능 계측 시스템을 이용하여 타각, 선회방향, 속력 등 다양한 조건으로 수차례에 걸쳐 선회시험을 실시하였다. 이를 바탕으로 선회권, 조종성 지수, 신침로 거리 등을 산출하여 상호 비교하였고, 그 결과 IMO 조종성 기준(Maneuvering standards)을 잘 만족하고 있음을 확인하였다. 실습선 한바다호는 좌현으로 선회하는 경우 모든 타각에서 선회권이 작게 측정되었고, 타 선박과 비교하여 선회성 지수(K)와 추종성 지수(T)가 상대적으로 크게 나타났다. 따라서 선회과정에서 선회경은 다소 작아질 수 있으나, 전진거리가 길어질 수 있으므로 전방의 위험물 회피에 주의가 요구된다. 또한, 신침로가 $30^{\circ}{\sim}90^{\circ}$인 경우 신침로거리는 $125m{\sim}300m$로 측정되었다. 이러한 결과는 충돌회피와 항내조선 및 협수도 항해 시 선박을 보다 안전하게 조선하는데 매우 중요한 지표가 될 것으로 판단된다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 춘계학술대회 논문집
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• pp.453-458
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• 2004

A capacitate sensor is a proper device for measuring high small displacement. General design parameters and procedure are discussed and a test sensor was built to have a measuring range of 100$\mu\textrm{m}$ and a sensitivity about 30nm. This sensor has too opposing electrode of comparably large area and has nominal gap distance about 150$\mu\textrm{m}$. So as to achieve a nano order displacement sensitivity, both sensor and target system have to be considered. This is important for the sensitivity can be achieved by minimizing a system total noise level in electronic type sensor application. Typical performance of the developed sensor is demonstrated in precision moving stage having 0.1$\mu\textrm{m}$ moving resolution.

• 오토저널
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• 제12권6호
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• pp.60-66
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• 1990

In order to measure the piston surface temperature and heat flux, autors have developed the measuring system with an instantaneous temperature probe. Such the instantaneous temperature probes were embodied into the top of piston for measurement and L-link system, designed to fit the test engine, extracts the thermocouple wires from the piston outside of engine employing a mechanical linkage. Then the instantaneous surface temperature was measured to calculate the heat flux flowing into the top surface of piston in a spark ignition engine. As a result, the following phenomena have been obtained through the study. 1) It is found that the time response and durability of temperature probe with a thin film thickness 10um and mechanical linkage with thermocouple wire extraction is sufficient at this experiment. 2) For the quantitative effect of variation in engine speed, the temperature swing and heat flux on the top of piston increase with increasing the engine speed. 3) It is proved that the temperature swing and heat flux decrease with distance from spark plug.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1090-1095
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• 2008

Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies use moving chord method, which determine versine values via a chord. The versine is the vertical distance to curve measured in the middle of the chord. This type of method measures only versine of track irregularity curve by transfer function from the characteristics of measuring device. In this report, review the characteristics of two types of measuring tools by comparing the measurements. The one is GRP-1000 system, optical surveying system with Total station and lazar prism trolley. This calculates track geometry by surveying absolute coordinates of two points each on both rail heads. The other is EM-120, measures versine with 10m of symmetrical chord length.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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• pp.217-219
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• 2003

This paper presents a distance relaying algorithm for a transmission line protection with MAS. First, the voltage and fault current of the opposite side are represented as a function of those of the measuring end using source voltages of both ends. These voltages are assumed to be obtained from the transformers protecting agents, periodically in normal state. Then, the fault location expression, independent of fault resistance, is derived with voltage and current in only one end of faulted line used. The suggested algorithm is applied to a simple system with two power sources to show its effectiveness.