• 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.

• 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.

• Korean Architects
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• no.10 s.70
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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.

• Journal of the 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.

• Korean journal of applied entomology
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• v.13 no.2 s.19
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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.

• KSCE Journal of Civil and Environmental Engineering Research
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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.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.25 no.2
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• pp.54-60
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• 1989

This paper described on the tracking of an individual fish at the fishing ground of set net by use of a small ultrasonic fish tag. The apparatuses used were composed with a tag, three receivers and two time-interval counter oscilloscope. A pulsed ultrasonic transmitter tag fitted to back of a dorsal fin of a yellowtail specimen, Seriola quinqueradidta TEMMINCK et SCHLEGEL is tracked by measuring differences in the time of arrival of the acoustic pulses at an arrangement of three receivers in the freeding tank. The successive positions of the fish were calculated from the differences in the received time of the signals. A fish carying the tag was tracked in the fishing ground of set net by use of the hydrophone and Loran-C. The results of the tests showed that this method gave good positional information to track the movement of an individual fish in the fishing ground of set net.

• Journal of IKEEE
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• v.17 no.4
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• pp.434-439
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• 2013

Artificial landmarks have been widely used for reducing the uncertainty in localization of a mobile robot. In addition, research for efficient placement of artificial landmarks has been considered as one of the fundamental issues since the cost of localization is increased with the number of used landmarks. Therefore, this paper proposes a method in which landmarks are efficiently placed by considering the uncertainty characteristics of the motion model and the sensor model. Because two models have different uncertainty distributions, the final uncertainty can be considerably reduced through their efficient combination. The usefulness of the proposed method is demonstrated by simulation results.

• 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.

• The Journal of the Korean life insurance medical association
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• v.17
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• pp.77-83
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• 1998

당사에서는 악성 종양에 대한 위험선택의 수단으로써 1997년 1월부터 종양표식자 중 CEA와 AFP 검사를 사의 진단에 한하여 실시하고 있다. 검사의 실시조건은 의사의 진찰소견으로 필요하다고 인정되는 경우와 관련병력의 고지가 있는 경우로 한하였다. 1997년 1월부터 10월말까지 실시한 건에 대해서만 분석을 하였으며 CEA 534건, AFP 608건를 실시하였다. 그 결과 기준치를 초과하는 경우는 CEA 33건, AFP 23건이었다. 표준체로 판정된 경우의 CEA의 평균치는 1.5ng/ml, AFP는 2.6ng/ml였다. CEA와 AFP의 검사결과나 그 이외의 원인으로 사절체의 판정을 받은 경우의 CEA의 평균치는 3.2ng/ml AFP의 경우는 20.7ng/ml로 나타났다. 본연구에서는 생명보험회사에서 종양표식자 검사의 의미를 검토해 보고자 하였다.