• Journal of Korea Water Resources Association
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• v.57 no.10
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• pp.725-739
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• 2024

In Korea, the national PMP map is used to calculate the Probable Maximum Precipitation (PMP) but the intercept adjustments are necessary to obtain uniform PMP envelopment results. The Box-Cox and cubic Spline methods to get the PMP envelopment modeling were proposed by the past studies.. However there has been no significant progress in the study of PMP envelopment modeling since then. This study, which focused on the last step of PMP estimation process in Korea, used the Monotone Cubic Spline (MCS) and compared with existing methods. As a result, the intercept adjustments involving the engineer's subjectivity were necessary to obtain smooth envelopment curves in case of using the existing method such as the cubic spline. However, a smooth envelopment curves were obtained without intercept adjustment in case of using MCS method. Therefore, using the MCS method for dam-related new projects can get smooth and consistent envelopment results without intercept adjustment for PMP calculation in Korea.

• Proceedings of the Zoological Society Korea Conference
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• 1995.10b
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• pp.236.2-236
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• 1995

• The Journal of the Korea Contents Association
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• v.11 no.4
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• pp.244-252
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• 2011

This study was to estimate the radiation dose associated with 64-slice multidetector CT(MDCT) in clinical practice and quantify the potential cancer risk associated with these examinations. Lifetime attributable risks(LAR) were estimated with models developed in the national Academies' Biological Effects of Ionizing Radiation VII report. Mean effective dose were 1.48mSv in Brain axial scan, 7.66mSv in chest routine contrast, 12.17mSv in coronary angiogram, 24.52mSv in Dynamic abdomen scan. LAR estimates for brain routine varied from 1 in 7463 for man to 1 in 4926 for women. In chest routine with contrast, LAR varied from 1 in 1449 for men to 1 in 952. LAR of Abdomen dynamic CT varied from 1 in 453 for men to 1 in 298 for women. So, 64-slice MDCT scan is associated with non-negligible LAR of cancer. Doses can be reduced by careful attention to scanning protocol.

• Journal of Yeungnam Medical Science
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• v.10 no.1
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• pp.144-156
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• 1993

This study was performed to investigate the effect of octreotide on the contractility of rat vas deferens. The smooth muscle strips isolated from the prostatic portion were myographied in isolated organ bath, Electric field stimulation (monophasic square wave, duration: 1 mSec, voltage : 50 V, frequency : 5 Hz or 30 Hz, train: 10 Sec) produced reproducible contraction. The contraction was composed of two component, first phasic component (FPC) and second tonic component (STC). These contractions were abolished by tetrodotoxin ($1{\mu}M$). Octreotide inhibited the field stimulation induced contractions both FPC and STC concentration-dependently. The FPC was decreased by a desentization of purinergic receptor by pretreatment of mATP, and the STC was decreased by pretreatment of reserpine(3 mg/kg, IP) 24 hours before experiments. Octreotide reduced the field stimulation induced contraction in the presence of mATP and of reserpinized muscle strips. The inhibitory effect of octreotide was more potent at 5 Hz than at 30 Hz. Octreotide did not affect basal ton and exogenous norepinephrine- or ATP-induced contraction. These results suggest that octreotide inhibit the contractility of the isolated rat vas deferens by inhibition of the release of neurotransmitters, both ATP and norepinephrine from adrenergic nerve terminal.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.46 no.3
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• pp.1-9
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• 2009

Using the projected 2-dimensional tilted images obtained from the transmission electron microscopy, we can reconstruct the 3-dimensional structures of objects, such as cells. As a preprocessing procedure, the tilted images should be registered and compensated in terms of the spatial position and the intensity difference, respectively. In this paper, we employ the fiducial marker-based approach to perform a registration, and introduce a simple intensity compensation scheme. Based on the transmissivity image formation model, we propose an algorithm that can compensate the components of the illumination and transmissivity of each image according to the tilted angle. Numerical analysis using real images obtained from the transmission electron microscopy are shown in this paper to show the performance of the proposed algorithm.

• 한국산학경영학회:학술대회논문집
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• 2004.11a
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• pp.73-100
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• 2004

본 연구는 기업은행은 1999년${\sim}$2003년 중소기업 대출 자료로 바젤2 자산상관계수 계산공식의 현실성을 검토하였다. 실증분석 결과에 따르면, 자산상관계수는 매출규모와는 양(+)의 관계를, 신용등급과는 음(-)의 관계를 갖는 것으로 나타나 바젤2 계산공식이 상정하고 있는 자산상관계수 패턴이 국내에서도 현실성이 있었다. 이는 자산상관계수가 매출규모와 음(-)의 관계를 보이는 것으로 보고한 Kim-Park(2004)과 상반되는 결과이다. 또한, 바젤2에서는 60억원 이하의 매출규모에 대해서는 60억원으로 간주하고 있지만, 매출규모 60억원 이하에서도 자산상관계수가 매출규모와 양(+)의 관계를 갖는 것으로 나타났다. 바젤2 계산공식에 의해 산출된 자산상관계수는 자료로 추정한 자산상관계수가 비해 1.3배${\sim}$19.2배 높으며, 이러한 차이는 통계적으로 유의할 뿐 만 아니라 경제적으로도 유의하다. 회귀분석 결과에 의하면, 바젤2 자산상관계수의 상향편의는 주로 계산공식에서 절편을 과도하게 높게 설정하였기 때문에 발생한 것으로 나타났으며, 바젤2에서는 매출규모와 자산상관계수간의 관계를 선형으로 설정하였지만, 로그선형이 실제 자료를 더 잘 적합시키는 것으로 나타났다. 이상의 결과로 보건대, 바젤2의 자산상관계수 계산공식은 비교적 현실적으로 고아된어져 있지만, 국내의 실정에 맞게 조정하기 위해서 보다 광범위한 실증분석이 필요한 것으로 판단된다.

• Korean Journal of Microbiology
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• v.36 no.4
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• pp.254-258
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• 2000

Invasion process of bacterial cell into intestinal epithelium is important in Salmonella infection. The invasion is induced by the proteins secreted by type III secretion appratus of Salmonella. It has been known that the proteins do not have N-terminal signal peptide existing in general secreted proteins. Recent studies on Yersinia reported that secretion signal of type III appratus may lie on 5'end secondary structure of mRNA of secreted protein. In this study, we constructed translational fusion of ompR and sopE, encoding type III secretion protein of Salmonella, and observed secretion of the fusion protein for investigating the secretion signal of Salmonella type III appratus. The sopE DNA fragments of the translational fusion contain the region of promoter and from start code to tenth or to fifth code. These translational fusions indicate that type III secretion signal of Salmonella is located on 5'end of mRNA encoding secreted protein. We constructed prototype of secretion vector using this signal to produce useful foreign protein.

• Journal of Dental Rehabilitation and Applied Science
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• v.27 no.3
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• pp.305-316
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• 2011

Cracked teeth are a common problem with incomplete fracture that typically shows pain on biting and temperature stimuli. The most common cause of crack is known to be the masticatory accident. Predisposing factors were aging, old restoration, and iatrogenic stress concentration, etc. Accurate diagnosis is needed for detecting the extent of crack and pulp vitality. There are many diagnostic tools like bite test, direct observation with transillumination, dye penetration, and radiographs. Immediate treatment for pain relief and occlusal adjustment would be needed. Composite resin and bonded amalgam showed favorable prognosis. Moreover, cusp protection is reliable permanent treatment for cracked teeth. The purpose of this article is to review the literature about the prevention, diagnosis, and treatment for cracked teeth.

• Journal of Life Science
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• v.9 no.1
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• pp.29-34
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• 1999

Cotyledon and hypocotyl explants of perilla were cultured on MS medium containing a combined concentration of BA(0.5, 1.0 and 1.5mg/$\ell$) and NAA(0.1, 0.5 and 2.0mg/$\ell$) in order to regenerate the explant and induce the callus. The best regeneration of the explant and induction of the callus were observed in a combined concenteration of 0.5mg/$\ell$ of BA and 0.5mg/$\ell$ NAA both in cotyledon and hypocotyl explants. In cotyledon explants, rooting was achieved upon transferring shoots to MS medium containing 0.5mg/$\ell$ of BA and 0.1mg/$\ell$ of NAA. We also investigated the change of protein and RNA content on developmental stage of callus and plant regeneration of perilla. Protein content was increased but RNA content was decreased as the culture period increases. The banding pattern of polypeptide revealed that both 30KD and 45KD polypeptides were obvious in cotyledon obtained from pre-culture explants, but only 30KD polypeptide was further getting obvious as the culture period increases.

• Journal of Korean Society of Forest Science
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• v.90 no.6
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• pp.742-746
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• 2001

This study was carried out to develop volume equations for Japanese Res Cedar(Cryptomeria japonica D. Don) trees which were widely planted from 1920s throughout the southern regions in south Korea. The 31 trees for stem analysis were selected in 6 different sites in the southern and 29 trees data were used for developing volume equation. The best equation in estimating Japanese Red Cedar trees's volume was suggested as $V=-0.002908+0.000125D^{1.907114}H^{0.645131}$. The simultaneous F-test for this equation revealed that the estimated individual tree volume was not significantly different (p=0.1936) from the observed tree volume for model evaluation. Therefore, this individual tree volume prediction equation could provide basic information for the construction of yield table and forest management.