• Title, Summary, Keyword: 표식

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Studies on the Enumeration of Population of Spawning Salmon (표식율법에 의한 연어 산란미수의 추정에 대하여)

  • Kim, Wan Soo
    • 한국해양학회지
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    • v.6 no.2
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    • pp.104-106
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    • 1971
  • In enumerating salmon spawning population by the tag-recovery method, the error caused by the emigration of the tagged fish into the non-statistical area and the misjudgement of the tagged fish as untagged, which is caused by bear predation, appear to give a bias to the estimate of population size. Efforts were made in the present study to remove such bias by estimating population size under certain assumtion and by introducing a correction equation for the sample tag-ratios.

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Color Landmark Based Self-Localization for Indoor Mobile Robots (이동 로봇을 위한 컬러 표식 기반 자기 위치 추정 기법)

  • Yoon, Kuk-Jin;Jang, Gi-Jeong;Kim, Sung-Ho;Kweon, In-So
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.9
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    • pp.749-757
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    • 2001
  • We present a simple artificial landmark model and robust landmark tracking algorithm for mobile robot localization. The landmark model, consisting of symmetric and repetitive color patches, produces color histograms that are invariant under the geometric and photometric distortions. A stochastic approach based on the CONDENSATION tracks the landmark model robustly even under the varying illumination conditions. After the landmark detection, relative position of the mobile robot to the landmark is calculated. Experimental results show that the proposed landmark model is effective and can be detected and tracked in a clustered scene robustly. With the tracked single landmark, we extract geometrical information than achieve accurate localization.

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항공장애물 표식설치에 관하여

  • Korea Institute of Registered Architects
    • Korean Architects
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    • no.10
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    • pp.28-33
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    • 1974
  • 항공기의 운행 안전을 위해 제40조 및 동법 시행 규칙 제133조, 제134조, 제135조, 제140조, 제141조, 제142조와 국제민간항공조약 부속서 제12조에 의거 설치 운용하고 있는 항공장애물 표식에 있어 건물 및 기지 시설 설치지 임의 설치, 또는 비설비 방치로 인해 항공장애물표식(주간 및 야간)관리 운용상 많은 지장을 초래하고 있을 뿐 아니라, 항공기 안전 운항의 불안전 요소가 되고 있어, 건물 및 기지 설비 시설 당국의 항공장애물 표식 적부검사를 받도록 관계기관에 요망하고 있는 바, 특히, 회원의 고층건물 설비 시 유의할 사항임으로 ‘항공기 관계조문’ ‘시행규칙’ ‘설치기준’ 및 ‘항공기장애물 설치허가신청서’의 양식을 소개한다.

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Unmanned Driving of Robotic Vehicle Using Magnetic Maker (자계표식을 이용한 로봇형 차량의 무인주행)

  • Im, Dae-Yeong;Ryoo, Young-Jae
    • Journal of Korean Institute of Intelligent Systems
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    • v.18 no.6
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    • pp.775-780
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    • 2008
  • In this paper, unmanned driving of robotic vehicle using magnetic marker is proposed. One of the most important component of autonomous vehicle is to detect the position of a magnetic marker on the road. In order to calculate the precise position of a magnet embedded on the road, the relation of magnetic field and a sensor is analyzed, and a new position sensing system using arrayed magnetic sensor is proposed. Also, the steering control system using a stepping motor is developed for driving by automatic mode as well as manual mode. For the verification of usability, the developed robotic vehicle is tested on magnetic road.

Studies on Phosphorus-32 Labeling of the House Fly ( I ) (Phosphorus-32에 의한 집파리의 표식효과 (I))

  • Ryu J.;Chung K. H.;Kwon S. H.;Kim H. W.
    • Korean journal of applied entomology
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    • v.13 no.2
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    • pp.93-97
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    • 1974
  • This paper describes experiments made to develop a technique for marking insects and get the informations for ecological studies as a means of tagging flies with radioactive phosphorus, and also to learn the effect on the subsequent generation of flies. Tests were conducted with house flies, Musca domestica L. emerged front the larvae that had reared in a media containing various concentrations of P-32. Radioactivity of the flies was measured with end-window type $(2mg/cm^2)$ Geiger-Muller counter and proportional counter made by Aloka. In following the daily increases in counting rates by 6-day-old larvae it was apparent the larvae in the starting media containing the higher concentrations of P-32 were showing high counting rates. It was found that about 13.2 per cent of the radioactive material remained in the empty puparia after the flies emerged. Radioactivity of the emerged flies decreased gradually and the biological halflife of phosphorus-32 was approximately 6.14 days with considerable variation. A significant amount of P-32 were detected in the abdominal and thoracic sections as compared with other parts of adult. The activity of phosphorus·32 in eggs and larvae produced by adults reared in medium containing 0.2 microcurie or more of P-32 per gram were readily detected with Geiger-Mi·lier counter. On the other hand, the radioactivity of eggs and larvae produced by the treated males crossed with untreated normal females could be only detected in the medium containing more of 2.0 microcurie with G.M. counter. There was no apparent damage to the flies at dosages as high as 0.5 microcurie per gram of medium. For field studies a concentration of 0.5 microcurie of P-32 per gram of artificial medium appears to give adequate labeling for positive identification of flies and their egg masses.

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Experimental Study on Irregular Wave Forces Acting on a Marker Rock Installed on a Submerged Breakwater (수중방파제 천단상의 표식암에 작용하는 불규칙파의 파력특성에 관한 실험적 연구)

  • Hur, Dong Soo
    • Journal of The Korean Society of Civil Engineers
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    • v.26 no.4B
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    • pp.413-420
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    • 2006
  • The construction of a submerged breakwater has become increasing due to their multiple effects on the coastal zone. Recently, marker rocks have been installed on the submerged breakwater to indicate its position to the vessels instead of buoy systems, since a buoy is not only improper for the ocean view, but also its mooring system may be damaged by the impulsive wave force caused by wave breaking on the breakwater. The accurate estimation of wave forces on such rocks is deemed necessary for their stability design. In this study, the characteristics of irregular wave forces acting on a marker rock, which was installed on a submerged breakwater, was investigated on the basis of laboratory experiments. It was revealed that the dimensionless highest one-third wave force tends to decrease with increasing the installation distance of a marker rock from the leading crown edge of a submerged breakwater. Also, the drag and inertia coefficients for irregular wave forces, which were obtained using the Morison equation, were investigated in relation to K.C. number.

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Study on data augmentation methods for deep neural network-based audio tagging (Deep neural network 기반 오디오 표식을 위한 데이터 증강 방법 연구)

  • Kim, Bum-Jun;Moon, Hyeongi;Park, Sung-Wook;Park, Young cheol
    • The Journal of the Acoustical Society of Korea
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    • v.37 no.6
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    • pp.475-482
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    • 2018
  • In this paper, we present a study on data augmentation methods for DNN (Deep Neural Network)-based audio tagging. In this system, an audio signal is converted into a mel-spectrogram and used as an input to the DNN for audio tagging. To cope with the problem associated with a small number of training data, we augment the training samples using time stretching, pitch shifting, dynamic range compression, and block mixing. In this paper, we derive optimal parameters and combinations for the augmentation methods through audio tagging simulations.