• Tunnel and Underground Space
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• v.16 no.4 s.63
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• pp.326-333
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• 2006

In this study, the vibration waveform of the single hole which is not interfered from the different blasting holes is separated, the each dominant frequency which is determinated through the Fast Fourier Transform(FFT) is measured. Also the separation waveform executed a superposition modeling which changes to delay time from 1ms to 80 ms in 1ms interval and controls the number of blasting holes from 2 holes to 15 holes in order to investigate the effect of PPV according to the duration time of the vibration and the number of blasting holes. As a result of analysis, the longer the duration time of the vibration, the longer the delay time which is not interfered from the different blasting holes and the effect regarding the number of blasting holes from inside identical delay time did not appear a lot.

• The KIPS Transactions:PartB
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• v.9B no.4
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• pp.501-508
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• 2002

In this paper, we propose a content-based image retrieval using the color ratio and moment of object region. We acquire an optimal spatial information by the region splitting that utilizes horizontal-vertical projection and dominant color. It is based on hypothesis that an object locates in the center of image. We use color ratio and moment as feature informations. Those are extracted from the splitted regions and have the invariant property for various transformation, and besides, similarity measure utilizes a modified histogram intersection to acquire correlation information between bins in a color histogram. In experimental results, the proposed method shows more flexible and efficient performance than existing methods based on region splitting.

• 한국지구물리탐사학회:학술대회논문집
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• 2006.06a
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• pp.35-38
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• 2006

The polarized direction of MT field was analyzed using the MT dataset measured in the Korean Peninsula. The atmospherics above 1 Hz has a large dispersion of polarized direction, whereas the Schumann resonance near 8 Hz exhibits the predominant direction ranging from $N20^{\circ}W$ to NS. The electromagnetic field variations below 0.1 Hz, induced by magnetic pulsations, show a strongly polarized direction of nearly NS. It results from the regular pulsations since the regular pulsation fields, driven by Alfv.n's wave in the magnetosphere, has a worldwide predominant direction of NS. The MT field strongly polarized along NS direction causes the poorly behaved XY impedance.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.22 no.2
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• pp.29-33
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• 2016

Background: The purpose of this study was to investigate the difference of height cognition ability according to dominant or non-dominant eye. Methods: Forty one healthy adults (male: 19, female: 22, 22-43 years) participated in this study. Hole in the card test was performed to identify dominant eye. To figure out height cognition ability between dominant and non-dominant eye, we had subjects answer which point is higher or even on the monitor. Results: The Right answer on dominant eye was $8.15{\pm}1.44$ point and the right answer on non-dominant eye was $7.56{\pm}1.55$ point. There was a statistically significant difference between dominant eye group and non-dominant eye group (p<.05). Conclusion: We think that the dominant eye may be used for reliable diagnosis. In future study, investigate on relation between dominant hand and dominant eye and the difference of dominant eye and non-dominant eye when to palpation are required.

• The Korean Journal of Quaternary Research
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• v.3 no.1
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• pp.1-15
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• 1989

The Holocene marine surficial sediments and submarine morphology of the continental shelf of the Korea South Sea have been investigated to understand the evolutionary history of tile continental shelf sedimentation in relation to Holocelle sea level fluctuations. It is considered that along 120m $\pm$ $\alpha$ water depth of so-called Pusan Trough between the Tsushima Island and Pusan, Korea the lowest stand of Holocene sea level seems to be existed.

• Journal of Biomedical Engineering Research
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• v.15 no.4
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• pp.419-427
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• 1994

A new method of digital image analysis technique for discrimination of cancer cell was presented in this paper. The object image was the Thyroid Gland cells image that was diagnosed as normal and abnormal (two types of abnormal : follicular neoplastic cell, and papillary neoplastic cell), respectively. By using the proposed region segmentation algorithm, the cells were segmented into nucleus. The 16 feature parameters were used to calculate the features of each nucleus. As a consequence of using dominant feature parameters method proposed in this paper, discrimination rate of 91.11 % was obtained for Thyroid Gland cells.

• Tunnel and Underground Space
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• v.23 no.1
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• pp.66-77
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• 2013

This paper deals with Poisson's ratio and volumetric strain behavior on loading-reloading terms under uniaxial condition targeting 404 individual rocks, which include sedimentary rocks as sandstone, shale, mudstone, conglomerate and tuff on Kyungsang basin. Poisson' ratio demonstrates increase, convergence and decrease behavior according to the increase in load, which results in preponderance of increase behavior. Volumetric strain demonstrates normal, positive and negative behavior according to the increase in load, which results in preponderance of normal behavior. On practice, Poisson's ratio can be indicative of high or low values with low values of design load. Consequently, a careful selection of results in in-situ sample experiment should be made and varying design conditions should be considered.

• Explosives and Blasting
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• v.18 no.2
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• pp.14-22
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• 2000

The estimation of proper prediction method and the alteration of transformation method of environmental regulation standard were carried out by measuring blasting noise in construction field. The correlation of scaled distance with sound pressure level were better than with sound level, but it was proved to be difficult to control blasting noise because the correlation factor was too 1ow. three methods to transform sound pressure levee to sound level were examined. The method is the transformation by correlation equation of sound pressure level and sound level which are measured at the same time, and simplified transformation of A-weighting network corresponding to dominant frequency, and the transformation of sound pressure level by FFT. There were many errors to transform. The best effective method is the transformation using correlation equation of sound pressure level and sound level which are measured at the same time.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.1 no.1
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• pp.32-45
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• 1996

Analyses of surface sediment textures and recent benthic foraminifera were carried out to understand the change of sedimentary depositional processes in the eastern part of Kwangyang Bay. Echo-sounding images revealed that topographic change of the delta front sheet sand was caused by POSCO (Pohang Steel Company)'s dredging and reclaiming. The sand body prograded toward southeast. Fine sediments are distributed in the northeastern part of the study area. Identification of benthic foraminifera was conducted for the two selected cores from the sand body for the first time. Dominant species are Ammonia beccarii, Elphidium excavatum and Quinqueloculina lamarckiana. No abrupt change of benthic foraminiferal assemblage was observed from the sedimentary sequences.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.264-267
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• 2005

플럭 형성 비소 오염토양에 대한 토양세척기법의 적용성 실험결과, 세척용액 100 mM과 500 mM의 농도에서 대상 토양에 대한 비소 용출량은 수산화나트륨이 염산보다 높은 효율을 보였으며, 농도 1000 mM의 경우에는 염산이 비교적 우세한 세척효율을 보였다. 토양오염공정시험법에 의한 세척후 토양내 잔류비소 농도의 경우, 염산이 수산화나트륨과 비슷하거나 다소 우세함을 알 수 있었다. 세척 대상 토양의 Cut-off size limit을 선정하여 토양세척시 생성되는 플럭을 제거하지 않고 반복 세척한 결과, 수산화나트륨의 농도 200 mM은 1000 mM에 비하여 잔류된 비소량이 비슷하거나 비교적 높았으며, 2가지 농도에 대하여 총 5회 반복 세척한 토양의 비소 농도는 토양환경보전법의 가지역 우려기준 농도인 6 mg/kg에 근접한 결과를 보였으나, 염산의 경우 총 5회 세척시 비소의 농도가 약 9 mg/kg으로 비소 잔류량이 보다 큼을 알 수 있었다. 플럭을 제거한 후 반복 세척시 수산화나트륨의 농도 1000 mM이 200 mM에 비하여 토양 세척효율이 증가하였으며, 1000 mM로 5회 세척시 잔류비소 농도가 가지역 우려기준 농도에 근접한 약 6.7 mg/kg이었고 염산을 이용하여 세척한 경우에는 3회 세척시 약 6.7 mg/kg 4, 5회 반복 세척시 각각 약 3.9, 3.3 mg/kg으로 가지역 우려기준에 적합한 농도조건이 됨을 알 수 있었다.