• Journal of Korean Ophthalmic Optics Society
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• v.9 no.2
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• pp.251-255
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• 2004

Our research is about the measurement of the distance & near horizontal phoria by the Von Graefe test. The inspection was processed about normal 60 subjects(120eyes) aged from 20 to 30) years old by the subjective method of refraction. Among 120 eyes, the myopia is 64eyes(53%) and the emmetropia is 56eyes(47%). In the measurement of the distance horizontal phoria, we could know that the exophoria is 40%(24 subjects), the esophoria is 40%(24 subjects), and the orthophoria is 20%(12 subjects). In case of the near horizontal phoria, we could know that the exophoria is 65%(39 subjects), the esophoria is 23.3%(14 subjects), and the orthophoria is 11.7%(7 subjects).

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1996.11a
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• pp.49-52
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• 1996

재해발생 형태가 시간과 장소에 따라 미료하게 달라지고 사고 발생시 재산피해는 극대화될 가능성이 높아짐에 따라 위험요소 감지를 위한 중앙집중적감시의 방재 시스템을 선호하고 있다. 그러나 기존의 종합 방재 시스템에서 사용하고 있는 RS232C나 RS422로는 원거리에서의 제어 및 감시가 곤란하다. 본 논문에서는 인터네트상의 WWW프로토콜인 HTTP를 사용하여 원거리에서 감시 및 제어할 수 있는 자동화 방재시스템의 통신환경을 구현하였다.

• Review of KIISC
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• v.22 no.4
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• pp.38-45
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• 2012

원거리 사람 인식은 영상 분석의 주요 연구 분야로서, 많은 연구자들이 CCTV 영상에서 사람 추적이나 행위를 분석하여 얼굴인식, 보안 상황 추출 등을 연구하고 있다. 이러한 연구와 관련하여 지능형 영상 감시 알고리즘의 성능을 측정하고 평가하기 위한 테스트 데이터베이스가 있어야 한다. 본 논문은 국외에서 소개된 지능형 영상감시를 위한 원거리 사람 인식용 영상 데이터베이스를 분석하고, 국내 상황을 고려한 테스트용 영상 데이터베이스 조건을 간략하게 제안한다.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.125-128
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• 1999

근거리음장 측정으로부터 원거리음장을 예측할 수 있는 이론적 모델 및 실험적 연구가 수행되고 있다. 본 논문에서 채택한 방법은 Helmholtz 적분식의 간단한 모델로써 단일주파수 코히어런트 음원의 근거리측정음장으로부터 원거리음장 예측이 가능한 기술이다. 이러한 단일 주파수, 코히어런트 음원의 원거리 수평방향지향성을 예측하기 위한 모델식 및 무향실에서 수행한 검증실험 결과를 소개한다 제안된 방법은 일반 소음원은 물론 잠수함 등의 수평방향 지향성의 예측에 적용가능하다고 판단된다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.49-51
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• 2001

현재까지의 고교배정은 지망배정과 무작위배정 방식을 이용한 배정방식으로 원거리 통학자가 다수 발생하는 등의 문제가 있다. 이러한 문제를 해결하기 위해 본 논문에서는 GIS의 네트워크 분석기능에 의해 계산된 학교와 학생간의 도로중심의 거리를 이용하여 원거리억제지향의 배정방식을 도입하였다. 본 논문에서 구현한 시스템을 울산지역에 적용한 결과, 근거리 배정 방식에 의해 배정된 학생(5318명)중 82.39%(4799)가 6Km미만의 근거리, 17.36%(1011명)가 6Km~18Km의 중거리, 0.25%(15명)가 18Km이상의 원거리로 배정되었다. 상기의 시스템은 학생 및 학교의 주소에 대한 자동주소맵핑기능, 학생과 각 학교에 대한 최단 거리의 자동생성, 학교의 정원초과에 의해 불가피하게 발생하는 원거리 학생을 최대한 억제하기 위한 방법 등을 고려하여 설계되었다.

• The Journal of the Acoustical Society of Korea
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• v.38 no.2
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• pp.240-245
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• 2019

This paper is a study result on long distance transmission of underwater acoustic sensor data over cable. The data transceiver is designed using the LVDS (Low Voltage Differential Signaling) transmission scheme, and the jitter characteristics are analyzed by measuring the long distance transmission signal through the cable. In order to reduce the jitter, a pre-emphasis technique is applied to compensate the transmitting signal to be attenuated by long distance transmission, and the transmission characteristics were verified according to the distance.

• Journal of Korean Ophthalmic Optics Society
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• v.13 no.1
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• pp.101-105
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• 2008

Purpose: In this study we measured the mean value of the distance stereoacutiy for adult subjects and evaluated the variation of the distance stereoacuity according to correction of phoria using the Pola Test E-II of Carl Zeiss. Methods: We investigated the distance stereoacuity for 50 adults (male: 29, female: 21) ranging in age from 19 to 46 years using D6 Circle chart and D8 Line chart in the Pola Test E-II. Results: The mean values of the distance stereoacuity measured on the D6 Circle test and D8 Line test were 159.6 and 149.4 seconds of arc respectively. The mean variations of the distance stereoacuity according to correction of phoria in D6 Circle test were increased 43.2 seconds of arc in exophoria and 51 seconds of arc in esophoria, and those in D8 Line test were increased 42 seconds of arc in exophoria and 70.2 seconds of arc in esophoria. Conclusions: We knew from these results that the distance stereoacuity after prescription of phoria improved more esophoria than exophoria.

• The Journal of the Acoustical Society of Korea
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• v.34 no.6
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• pp.455-462
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• 2015

It is well known that warm eddy is frequently developed through the year in the East Sea. The warm eddy may affect sound propagation due to changes of sound velocity structures in the sea water. To verify the effects of the warm eddy for long-range sound propagation, transmission loss and performance surface, which were used mean direct signal excess range generated by sound propagation modeling using re-analyzed climatology data on March 23th in 2007 were analysed. From these analyses, we found that characteristics of sound propagation in the sea water are changed by the warm eddy, and boundaries of the warm eddy act as a barrier for long-range sound propagation. Furthermore, these disadvantages of the eddy related to sound propagation were increased when the sea bottom depth is shallow.

• The Journal of the Acoustical Society of Korea
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• v.18 no.6
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• pp.31-37
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• 1999

This paper describes the far-field estimation using the near-field measurement data. Measurement in far-field region gives us the acoustical characteristics of the source but in general measurement is made in near-field such as acoustic water tank or anechoic chamber, so far-field acoustical characteristics of the source should be predicted from near-field data. In this case, the number of measurement points in the near field which relates to the accuracy of the predicted field and the amount of data processing, should be optimized. Existing papers say that measurement points is proportional to kL and depends on geometry and directivity of the source. But they do not give us any definite criterion for the required number of measurement points. Boundary Collocation Method which is one of the far-field prediction methods, is analyzed based on Helmholtz integral equation and Green function and it has been found that the number of measurement points is optimized as 0.54kL which is about one half of the existing results.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.4 s.304
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• pp.87-94
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• 2005

3D image mosaicking is useful for 3D visualization of the roadside scene of urban area by projecting 2D images to the 3D planes. When a sequence of images are filmed from a side-looking video camera passing long distance areas, the ghost effect in which same objects appear repeatively occurs. To suppress such ghost effect, the long distance range areas are detected by using the distance between the image frame and the 3D coordinate of tracked optical flows. The ghost effects are suppressed by projecting the part of image frames onto 3D multiple planes utilizing vectors passing the focal point of frames and a virtual focal point. The virtual focal point is calculated by utilizing the first and last frames of the long distance range areas. We demonstrate algorithm that creates efficient 3D Panoramic mosaics without the ghost effect at the long distance area.