• 한국전자거래학회지
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• 제19권4호
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• pp.45-60
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• 2014

컴퓨터 단층 촬영(Computed Tomography)을 통해 만들어진 3차원의 데이터를 온라인상으로 치과 의료에 사용하게 되면서 정보의 왜곡이나 손실 없이 3차원의 해부학적 정보를 얻을 수 있고, 치아 이식술이나 교정을 하기 전에 안전하게 치료계획을 세울 수 있다. CT 데이터를 이용한 정확한 진단을 위해서는 개별 치아를 분할 할 수 있어야 한다. 그러나 CT 데이터 상에서 치아 영역과 그 주변 영역은 밝기의 차이가 크기 않기 때문에 개별 치아를 분할하는 작업은 쉽지 않다. 특히 치아의 뿌리 부분으로 갈수록 치아 주변에 턱 뼈가 위치하기 때문에 더욱 구별이 힘들다. 본 논문에서는 자동으로 개별 치아를 분리하는 기존의 SRG(Seeded Region Growing) 알고리즘에 레벨-셋 방법을 추가하여 치아 뿌리 부분까지 더 정확하게 분할하는 알고리즘을 제안한다. 제안한 방법은 기존의 방법과 비교한 결과 개별 치아의 종류에 따라 19.2%의 정확도 향상을 얻을 수 있다.

• Ocean Systems Engineering
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• 제4권3호
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• pp.169-183
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• 2014

For the reliable design of substructure supporting offshore wind turbines it is very important to reduce the effects of wave forces. Since the substructure is strongly influenced by the effects of wave forces as the size of substructure increases. In the present study, the hybrid substructure with multi-cylinder is newly suggested to reduce the effects of wave forces. Using diffraction theory the scattering waves in a fluid region are expressed by an Eigenfunction expansion method with three dimensional potential theory to calculate the wave force acting on the hybrid substructure. The wave force and wave run-up acting on the hybrid substructure is presented to examine the water wave interaction according to the variation of cylindrical size and the distance among cylinders. It is found that the suggested hybrid substructure with multi-cylinder is very useful to reduce the effects of wave forces acting on the substructure for offshore wind turbines.

• 대한수의학회지
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• 제57권1호
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• pp.37-42
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• 2017

Getah virus (GETV) infection causes sporadic outbreaks of mild febrile illness in horses and reproductive failure in pigs. In this study, we established a reverse transcription polymerase chain reaction (RT-PCR) method to detect GETV from suspected virus-infected samples. The reaction conditions were optimized and validated by using RNA extracted from GETV propagated in cell culture. A GETV-specific GED4 primer set was designed and used to amplify a 177 bp DNA fragment from a highly conserved region of the E1 glycoprotein gene in the GETV genome. RT-PCR performed with this primer set revealed high sensitivity and specificity. In the sensitivity test, the GED4 primer set detected GETV RNA at the level of $10^{2.0}\;TCID_{50}/mL$. In the specificity test, the GED4 primer set amplified only a single band of PCR product on the GETV RNA template, without non-specific amplification, and exhibited no cross-reactivity with other viral RNAs. These results suggest that this newly established RT-PCR method is useful for accurate identification of GETV infection in animals.

• 한국환경농학회지
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• 제37권4호
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• pp.283-290
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• 2018

본 연구는 LC-MS/MS법을 적용하여 농산물에 함유된 pyridine계통의 제초제 Clopyralid의 잔류분석법을 확립하였다. 대표적인 농산물로는 귤, 고추, 대두, 감자 및 현미를 선정하였고 acetonitrile에 의해 추출된 성분을 QuEChERS법을 변경하여 정제법으로 사용하고 LC-MS/MS를 사용하여 분석법을 확립하였다. Clopyralid의 정량적 분석을 위한 최적 분석 조건을 확립하였으며, 검출한계는 0.001 mg/kg, 정량 한계(LOQ)는 0.01 mg/kg이었다. 각 대표 농산물에 대한 정량한계, 정량한계의 10배, 50배 수준에서 회수율을 검토한 결과 모든 처리 농도에서 81.7~105.8 %수준을 나타내었으며, 모든 수준에서 20 % 미만의 분석오차를 나타내어 잔류분석기준을 만족하였다. 본 연구에서 확립된 Clopyralid분석법은 검출한계, 회수율 및 분석오차에서 국제적 분석기준을 만족하는 분석법으로 농산물에 따라 정량분석법으로 사용 가능할 것으로 사료된다.

• 한국군사과학기술학회지
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• 제25권2호
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• pp.117-124
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• 2022

Single-ring circular array antennas can be applied to direction finding systems in order to use nose-section in other purposes, and the interferometry is a proper direction finding method to those systems. We usually make the interferometer baseline long enough to achieve good angular accuracy. However, an interferometer with baseline longer than a half-wavelength has the ambiguity problem. In this paper, we present a novel method for solving the ambiguity problem in interferometry systems. This technique is based on the amplitude comparison method and the space division table, and it can place a target within the angular region in which the ambiguity problem does not occur by roughly estimating direction-of-arrival. The Monte Carlo simulation results show that proposed method can effectively remove the ambiguity problem in the system.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.927-932
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• 2010

This study made a nationwide metropolitan region map on the basis of disaster vulnerability and administrative boundary, and based on it, it divided small-sized regions and constructed disaster history of each region. For the disaster vulnerability, the study wrote slope, aspect, curvature, wetness index, and drainage density, compared and analyzed regions with disaster and geomorphic elements to distinct the factor with high correlations, and based on it, it divided small-sized regions for forecasting and warning system of middle regions(Gangwon province, Chungchung province, and Jeolla province). Through the method, Gangwon region were divided into 4 small-sized regions, Chungchung into 5 small-sized regions, and Jeolla into 6 small-sized regions.

• Journal of information and communication convergence engineering
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• 제6권1호
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• pp.94-99
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• 2008

Segmentation for the region of nucleus in the image of uterine cervical cytodiagnosis is known as the most difficult and important part in the automatic cervical cancer recognition system. In this paper, the region of nucleus is extracted from an image of uterine cervical cytodiagnosis using the HSI model. The characteristics of the nucleus are extracted from the analysis of morphemetric features, densitometric features, colormetric features, and textural features based on the detected region of nucleus area. The classification criterion of a nucleus is defined according to the standard categories of the Bethesda system. The fuzzy C-means clustering algorithm is employed to the extracted nucleus and the results show that the proposed method is efficient in nucleus recognition and uterine cervical Pap-Smears extraction.

• 품질경영학회지
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• 제25권2호
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• pp.102-111
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• 1997

In this paper I discuss a method of constructing the confidence region for the logistic response surface model. The construction involves a, pp.ication of a general fitting procedure because the log odds is linear in its parameters. Estimation of parameters of the logistic response surface model can be accomplished by maximum likelihood, although this requires iterative computational method. Using the asymptotic results, asymptotic covariance of the estimators can be obtained. This can be used in the construction of confidence regions for the parameters and for the logistic response surface model.

• Journal of Astronomy and Space Sciences
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• 제28권4호
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• pp.285-290
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• 2011

This paper presents an algorithm that can provide initial conditions for formation flying at the beginning of a region of interest to maximize scientific mission goals in the case of a tetrahedral satellite formation. The performance measure is to maximize the quality factor that affects scientific measurement performance. Several path constraints and periodicity conditions at the beginning of the region of interest are identified. The optimization problem is solved numerically using a direct transcription method. Our numerical results indicate that there exist an optimal configuration and states of a tetrahedral satellite formation. Furthermore, the initial states and algorithm presented here may be used for reconfiguration maneuvers and fuel balancing problems.

• 전자공학회논문지A
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• 제33A권5호
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• pp.203-211
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• 1996

This paper describes CAD tools for the construction of image database in IC chip analysis CAD system. For IC chip analysis by high-resolution microscopy, the image database is essential to manage more than several thousand images. But manual database construction is error-prone and time-consuming. In order to solve this problem, we develop a set of CAD toos that include image grabber to capture chip images, image editor to make the whole chip image database from the grabbed images, and image divider to reconstruct the database that consists of evenly overlapped images for efficient region search. we also develop an interactive pattern matching method for user-friendly image editing, and a heuristic region search method for fast image division. The tools are developed with a high-performance graphic hardware with JPEG image comparession chip to process the huge color image data. The tools are under the field test and experimental resutls show that the database construction time can be redcued in 1/3 compared to manual database construction.