• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.54-61
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• 1999

Objective of the research is to put the vast and complex fault tracking knowledge of human experts in semiconductor production line into the knowledge base of computer system. We mined the fault tracking knowledge of domain experts(engineers of production line) for the construction of knowledge base of the expert system. Object oriented fact models which increase the extensibility and reusability have been built. The rules are designed to perform the fault diagnosis of the items in production device. We have exploited the evidence accumulation method to assign check priority in rules. The major contribution is in the overall design and implementation of the nile base and related facts of the expert system in object oriented paradigm for the application of the system in fault diagnosis in semiconductor production line.

• 대한음성학회지:말소리
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• 제66호
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• pp.21-39
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• 2008

The purpose of this study is to analyze the intonational slope characteristics of the Korean news utterances. Prosodic phrases were analyzed in terms of the K-ToBI labeling system. In addition, the change of intonation contour that occurs throughout the sentences was discussed in terms of types of media and gender. Results showed that the overall declination of the intonation contour of radio and male revealed a gentler slope than that of TV and female, respectively. While the regression of the top line slope showed male's higher $R^2$ with the number of words, the base line slope of the radio and female was proved to be highly influenced from the number of syllables, words, and prosodic phrases. A lot more independent variables statistically affected to the base line slope. This means that the base line slope was strongly related to the variables, the top line slope, otherwise, could be more freely fluctuated due to the light correlation with them.

• 대한전기학회논문지:시스템및제어부문D
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• 제52권2호
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• pp.107-111
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• 2003

In the power-line communication systems, there are many factors of noise and attenuation in the power-line channels, because they were designed for not the communication but the power transmission. Also the transfer function of the channels is highly changed with the topology and the load of the power-lines. To cope with these poor channel situation, channel modeling, one of the many studies in progress, is being studied hard. Channel modeling is essential to apply the active schemes to overcome the bad channel(e.g. modulation technique, channel coding, signal coupling & filtering, etc.) to the power-line communications. In this paper, we have realized the statistical model(this model is suggested as the channel modeling method for the power-line channels) that is combined the transfer function with the various noises. And we have compared and examined the results with the measured data. Also we have studied the plan which can effectively establish the channel data base for the channel information consisted of the parameters that are derived from this modeling, and we have studied the plan to utilize the data base.

• 전기학회논문지
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• 제67권12호
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• pp.1723-1728
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• 2018

In order to investigate the voltage drop compensation effect of AT for domestic railway vehicle base, the parameters of AT voltage drop of railroad car base are Z3 (Impedance of feeder line), Xn ( Distance from railroad vehicle to AT to SS), and Dn (distance between both ATs of railway vehicle).In addition, when installed in a SSP for a railway vehicle base, there is no AT and feeder line in the railway vehicle base except for the SSP for the main line and the SSP for the railway vehicle base, so that if zero or ignored, the AC single-phase two- It can be confirmed that it becomes a form.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.719-723
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• 1997

The welding automation in ship manufacturing process,especially in the sub-assembly line is considered to be a difficult job because the welding part is too huge, various, unstructured for a welding robot to weld fully automatically. The weld orocess at the sub-assembly line for ship manufacturing is to joint the various stiffener on the base panel. In order to realize automatic robot weld in sub-assembly line, robot have to equip with the sensing system to recognize the position of the parts. In this research,we developed a vision system to detect the position of base panle for sub-assembly line is shipbuilding process. The vision system is composed of one CCD camera attached on the base of robot, 2-500W halogen lamps for active illumination. In the image processing algorithm,the base panel is represented by two set of lines located at its two corner through hough transform. However, the various noise line caused by highlight,scratches and stiffener,roller in conveyor, and so on is contained in the captured image, this nosie can be eliminated by region segmentation and threshold in hough transform domain. The matching process to recognize the position of weld panel is executed by finding patterns in the Hough transformed domain. The sets of experiments performed in the sub-assembly line show the effectiveness of the proposed algorithm.

• 대한의용생체공학회:의공학회지
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• 제20권3호
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• pp.275-281
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• 1999

현재 널리 쓰이고 있는 PW 도플러 시스템 주파수가 나이퀴스트 주파수를 초과할 경우 스텍트럼 aliasing 현상에 의하여 정확한 혈류 속도의 측정을 할 수 없다는 문제점을 가지고 있다 . 도플러 스펙트럼의 aliasing 현상을 극복하기 위하여 통상적으로 기준선 (Base Line) 이동기법을 사용하고 있으나 도플러 오디오 신호는 aliasing 된채로 남게 된다. 이 논문에서는 주파수 천이 및 필터링 기법들을 적절히 적용하여 기준선 이동시 도플러 스텍트럼과 오디오 신호의 aliasing 현상을 함께 제거할 수 있는 기법을 제안한다. 제안된 방법은 단방향 혈류 성분을 검사하는 경우 aliasing 현상 없이 측정 가능한 도플러 주파수를 나이퀴스트 주파수의 두배인 PRF 까지 증가되도록 한다. 실제 시스템에서 얻어진 신호를 이용하여 제안된 방법을 실험적으로 검증하였다.

• 수산해양교육연구
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• 제19권3호
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• pp.478-490
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• 2007

A technology of ultrasonic biotelemetry for tracking fish behavior is investigated. The ultrasonic biotelemetry system is constituted by a transmitter and a receiving system. Because a pinger was mainly used for the transmitter, the capability for pinger to possess was investigated and the efficient usage for pinger was examined. A source pressure level and a frequency were synthetically examined so that pinger could realize small size, a light weight, and a long life time. The receiving system is divided roughly into directional hydrophone systems and acoustic positioning systems by the receiving method. The directional hydrophone system is divided into single beam and multiple beam with the number of hydrophone, and the acoustic positioning systems is divided into LBL (Long Base Line), SBL (Short Base Line), and SSBL (Super Short Base Line) on the basis of base line. The present situation, the merits and demerits, and the principle of each receiving method were investigated in detail, and the efficient usage for each receiving method were examined.

• 산업기술연구
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• 제9권
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• pp.67-77
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• 1989

This study is concerned with the accuracy, the pattern of error with which subjects can interpolate the location of a pointer or a target between two graduation markers with various size on CRT display. Stimuli were graphic images on CRT with a linear, end-marked, ungraduated scales having a target for t base-line sizes. The location of a target is estimated in units over the range 1-99. Smallest error of estimates was at the near ends and middle of the base-line. The median error was less 2 units, modal error was 1, and most error(;99.6%) was within 10. Subjects had a more tendency to overestimate than to underestimate at the left-part of base-line in all siges, and an opposite tendency at the right-part. A proper size to minimize the interpolation error exists such that size 500. It is suggested that interpolation of fifths and even tenths will give a reguired accuracy for certain situations, and relative location and base-line size has a relevant attribute to interpolate.

• Journal of Welding and Joining
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• 제19권6호
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• pp.608-613
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• 2001

In this study, the rotary bending fatigue test was carried out with two kinds of base metal, martensite stainless steel STR3 and austenite stainless steel STR35 and the dissimilar friction welded material with them. To compare the fatigue fifes according to the notch positions, the small circular defect was worked on the bonded line, 1.0mm and 0.5mm distance form the bonded line. The fatigue limits of the STR3 and STR35 base metal were 429.0MPa and 409.4MPa respectably. In comparison with fatigue life at the same notch positions, the STR35 specimens showed about 190% for base metal, 82% for 1.0mm distance notched specimens higher than that of the STR3. But the fatigue life of the 0.5mm distance notched STR35 specimen showed about 35% lower than that of the STR3 specimen. And the bonded line notched specimen was much lower fatigue life than the other specimens because of separation of the bonded line.

• 대한치과교정학회지
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• 제27권4호
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• pp.633-641
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• 1997

성장 또는 치료로 인한 악안면골의 변화는 두부 방사선을 중첩 함으로써 판단할 수 있다. 중첩에 대한 평가는 중첩방법에 따라 변화되므로 좀더 정확한 중첩 방법을 선택하는 것은 치료 효과에 대한 분석이나 성장 변화에 대한 평가를 정확히하는 선결 요건이 될것이다. 3년 정도의 비교적 짧은 성장기간을 가진 11세 전후의 여자 환자 19명을 대상으로, 가장 널리쓰이는 중첩 방법인 Nasion-Sells line중첩과 Bjork가 주장하는 Anteirior cranial base (ACB)중첩을 비교하여 다음과 같은 결론을 얻었다. 1 Nasion-Sells line중첩과 ACB중첩은 중첩오차(registration error)의 크기가 거의 같아서 reliability에 있어서 큰차이가 없는 것으로 나타났다 2. 검사자간 차이(interobserver difference)에 있어서 Nasion-Sells line중첩은 7개의 측정 항목 모두에서 두 검사자간에 차이가 없었으나 ACB중첩은 7개의 측정 항목중 4개의 측정 항목에서 두 검사자간 유의성 있는 차이가 나타났다. 3. 중첩방법의 차이 (intermethod difference)에 있어서 Nasion-Sella line중첩으로 측정한 계 측치와 ACB 중첩으로 측정한 계측치가 유의성있게 차이가 나지 않았다.