• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.507-514
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• 2012

In the present research, NASA LRB plume radiation models are reconstructed with Thermal Desktop software, where the radiation to vehicle base environment can be calculated. The calculation shows the similar radiation heat compared to NASA prediction. Based on LRB plume radiation model, a KSLV-II thermal radiation model is proposed.

• 대한족부족관절학회:학술대회논문집
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• 2011.04a
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• pp.28-28
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• 2011

• Proceedings of the Zoological Society Korea Conference
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• 1994.10a
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• pp.149.2-149
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• 1994

• Korean Journal of Remote Sensing
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• v.24 no.6
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• pp.621-629
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• 2008

This study was carried out in part of Tamil Nadu, India. Also, Landsat ETM+ image and field sampling data were acquired. The field data were basal area, number of trees and number of species. Using the data set, this study performed a three steps processing, (1) Image classification (2) extracting the vegetation indices(NDVI, Tasseled cap brightness, greenness and wetness) (3) mapping the prediction of biodiversity distribution using basal area and NDVI image value. Basal area was significantly correlated with NDVI. The result of classification showed 69% overall accuracy.

• Research in Plant Disease
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• v.12 no.1
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• pp.20-24
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• 2006

Several pathogens associated with bulb rot of lilies in storage house were identified with respect to rot types. Rot patterns were grouped into four different types; brown rot of bottoms, brown rot of shoots, water-soaked rot and blue mold. Brown rot of bottoms was the highest in frequency with 72.5%, and brown rot of shoots the least with 23.0%. Dominant pathogens were differed with rot patterns, brown rot of bottoms by Fusarium oxysporum, blue mold and brown rot of shoots by Penicillium brevicompactum and P. fellutanum. In wound-inoculation tests, Penicillium and Fusarium isolates caused severe rot on the bulbs. Bulb disinfection before storage by captan showed the most prominent control value of 95.2% followed by thiophanate-methyl with 85.6%.

• Journal of the Korean association of regional geographers
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• v.18 no.2
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• pp.129-140
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• 2012

In order to examine geomorphic characteristics such as form and retreat process of waterfalls in Jeju Island, 26 waterfalls were classified based upon materials forming a fall face. The waterfalls could be categorized into three types such as single unit, multiple units and basal soft-rock based upon the number and type of a lava flow. A block fall, composed of a pile of large blocks, could be added to the typology of waterfalls in Jeju Island. While the single unit fall is distributed in a region of trachyte or trachyandecite, the multiple units fall and basal soft-rock fall are largely developed in a region of basalt or trachybasalt. A retreat process of the single unit fall is an inclination or a replacement, but the basal soft-rock fall shows a parallel retreat. The multiple units fall exhibits three types of a retreat process according to the physical properties of a lava flow. The fall face is generally vertical due to well-developed vertical joints of a lava flow.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.38 no.2
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• pp.16-26
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• 2001

This paper develops the fast dynamic programming technique to construct the subband structure yielding the maximum coding gain for given filter bases and a given limit of implementation complexity. We first derive the unified coding gain which can be applied to non-orthogonal filter basis as well as orthogonal filter basis and to arbitrary subband decompositions. Then, we verify that the unified coding gains in real systems are monotonically increasing function for the implementation complexities which are proportional to the number of subbands. By using this phenomenon, the implementation complexity and the coding gain are treated in the same way as the rate and distortion function. This makes it possible to use the Lagrangian multiplier method for finding the optimal subband decomposition producing the maximum coding gain [or a given limit of implementation complexity.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1233-1237
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• 2010

강변여과는 지표수와 지하수가 각기 갖는 장점과 제약점을 상호 보완하여 수질이 양호한 상수원수를 대량 확보하기 위한 실제적 대안이다. 자연적인 여과작용에 의해 수질이 개선되는 효과가 있어 경제적이고 안정적으로 확보할 수 있지만, 장기간 취수는 지하수위의 저하를 가져 올 수 있으므로 유역의 수문분석을 통한 기저유출량 산정에 관한 연구가 필요하다. 대상지역으로는 현재 강변여과를 개발중인 창원시 대산정수장 취수장 지역이며, 대상지역의 기저유출량을 산정하기 위해 대상지역 상류에 위치한 낙동강 본포교의 낙동강 유량을 기초로 기저유출량을 산정하여 지하수 함양율을 평가하였다. 수문곡선 분리는 여러 방법 중 다른 방법보다 상대적으로 간편하고 실무에서 많이 사용되는 방법인 수평직선분리법을 사용하여 적정 취수 가능량을 산정하기 위한 최소 기저유출량을 산정하고자 한다. 이에 따라, 보유 자료 중 연 평균 최저 유출량을 보인 2008년 가을 갈수기의 시작(2008년 10월)부터 2009년 가을 갈수기의 시작(2009년 10월)까지의 자료를 분석했다. 본포교 유량 자료는 8일부터 10일 간격으로 측정되고 있기 때문에 결측치는 최인접 두 지점 사이의 선형보간법으로 보완했다. 다소 많은 양의 결측치에 대한 보정과 해당 유역의 연간 유출 특성을 파악하기 위해서 이동평균(moving average)을 적용했으며, 적용 결과 관측 주기에 해당하는 10일 이동평균 유출수문곡선이 가장 적합한 것으로 나타났다. 10일 이동평균에 의한 유출수문곡선에 의하면 상승부의 기점은 2009년 6월 12일로 나타났으며 유출량은 47.87cms로 나타났다. 따라서 총 기저유출량은 상승부 기점의 유출량으로 111일 동안 발생하는 것을 알 수 있었으며 그 총량은 약 45,900만$m^3$으로 나타났다. 본 연구에서의 결과 본포교를 유역출구로 하는 이 유역에는 임의 유출이 생기는 호우사상 시, 기저유출량은 총 유출량의 6.38%를 최소한 기대할 수 있음을 알 수 있다.

• Journal of the korean academy of Pediatric Dentistry
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• v.26 no.2
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• pp.416-426
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• 1999

The objective of this study is to confirm the effect of dentine bonding primer application on penetration of sealant. Extracted permanent molars were used to compare penetration success rate of control group (sealant application only) and experimental groups (sealant application after applying the primers of $Scotchbond^{TM}$ Multi-Purpose system and $All-Bond^{(R)}$ 2 system). The following results were obtained: 1. The experimental groups using the primers showed increased sealant penetration success rate to the base of fissure when compared to control group but there was no statistically significant differences(p>0.05). 2. The depth, width and 'depth/width' value of fissure had statistically significant effect on sealant penetration success rate(p<0.05). 3. The penetration success rate decreased about 0.9 times as the depth of fissure increased every $25{\mu}m$, and increased about 1.1 times as the width of the fissure orifice increased every $25{\mu}m$ and decreased about 0.6 times as the 'depth/width' value increased every 1. From the above results, it can be concluded that assure morphology had a great effect on sealant penetration and for better penetration, use of dentine bonding primer can be helpful but it needs more study in clinical bases.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2006.05a
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• pp.327-330
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• 2006

Numerical simulations were carried out to investigate the base drag characteristics of a base bleed projectile with a central propulsive jet by considering the base homing process. Overall fluid dynamic process is modeled by Wavier-Stokes equations for reacting flows with two-equation $k-\omega$ SST turbulence closure. The combustion process is modeled by finite-rate chemistry with a given partially burned exit condition of the BBU (base-bleed unit). Besides the demonstrating the capability of the present CFD solver for the base drag and the interaction of the base flow with a rocket plume, present study gives an insight into the fluid dynamics and the combustion process of the hybrid-propulsion projectile.