• International Journal of Aeronautical and Space Sciences
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• v.3 no.2
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• pp.40-45
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• 2002

A radiation analysis is performed for the Ka and Ku-band transponder of the Communications and Broadcasting Satellite (CBS) that is planned for launch into the geo-synchronous orbit. A particular attention is given to calculation of Total Ionizing Dose (TID) for the mission life time of 15 + 3 years. A numerical modeling of the charged particles at the geo-synchronous orbit is undertaken. The charged particles from the modeling are then transported through the mechanical structure and component housings of the transponder. A set of locations are selected for the detailed calculation of TID. The results from the present calculation show that three-dimensional modeling of the component housings as well as the mechanical structure of the spacecraft is requisite in order to acquire a reliable calculation of TID.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.353-356
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• 2004

일반적으로 컴포넌트 기반의 SW는 바이너리 파일로 구성되어 있다. 즉, 블랙박스 형식이다. 따라서 컴포넌트 테스팅 시에 코드기반의 화이트박스 테스트 기법을 적용하기가 어렵다. 그래서 컴포넌트 테스팅 시에는 소스코드기반이 아닌 명세기반의 테스트를 수행해야 한다. 그러나 컴포넌트 제공자는 고객에게 바이너리 파일과 일부분의 명세만을 제공한다 즉, 컴포넌트 제공자는 컴포넌트 안에서의 테스트 범주와 테스트 메트릭에 대한 정보를 제공하지 않는다. 이에 따라 고객은 컴포넌트의 테스트 적절성, 테스트 커버리지, 그리고 테스트 품질을 이해하는 것이 어렵다. 그리고 효과적인 테스팅을 위해서는 적절한 테스팅 모델이 있어야 한다. 따라서 본 논문에서는 컴포넌트 테스팅을 효율적으로 하기 위하여 컴포넌트 테스팅 모델을 제안하였고, 테스팅을 위한 명세 요소를 식별하였다.

• Biomolecules & Therapeutics
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• v.22 no.4
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• pp.363-369
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• 2014

Synthetic cannabinoids (CBs) such as the JWH series have caused social problems concerning their abuse liability. Because the JWH series produces euphoric and hallucinogenic effects, they have been distributed illegally under street names such as "Spice" and "Smoke". Many countries including Korea have started to schedule some of the JWH series compounds as controlled substances, but there are a number of JWH series chemicals that remain uncontrolled by law. In this study, three synthetic CBs with different binding affinities to the $CB_1$ receptor (JWH-073, 081, and 210) and ${\Delta}^9$-tetrahydrocannabinol (${\Delta}^9$-THC) were evaluated for their potential for psychological dependence. The conditioned place preference test (unbiased method) and self-administration test (fixed ratio of 1) using rodents were conducted. $K_i$ values of the three synthetic cannabinoids were calculated as supplementary data using a receptor binding assay and overexpressed $CB_1$ protein membranes to compare dependence potential with $CB_1$ receptor binding affinity. All mice administered JWH-073, 081, or 210 showed significantly increased time spent at unpreferred space in a dose-dependence manner in the conditioned place preference test. In contrast, all tested substances except ${\Delta}^9$-THC showed aversion phenomenon at high doses in the conditioned place preference test. The order of affinity to the $CB_1$ receptor in the receptor binding assay was JWH-210 > JWH-081 >> JWH-073, which was in agreement with the results from the conditioned place preference test. However, no change in self-administration was observed. These findings suggest the possibility to predict dependence potential of synthetic CBs through a receptor binding assay at the screening level.

• Journal of Microbiology
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• v.35 no.4
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• pp.290-294
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• 1997

4-Chlorobiphenyl-degrading Pseudomonas sp. DJ-12 was able to degrade 4-chlorobenzoate(4CBA), 4-iodobenzoate, and 4-bromobenzoate completely under aerobic conditions. During. the degradation of 4CBA by Pseudomonas sp. DJ-12, chloride ions were released by dechlorination and 4-hydroxybenzoate was produced as an intermediate metabolite. The NotI-KNA fragments of pKC157 containing dechlorination genes hybridized with the gene encoding 4CBA:CoA dehalogenase of Pseudomonas sp. CBS3 which is responsible for the hydrolytic dechlorination of 4CBA. These results imply that Pseudomonas sp. DJ-12 degrades 4CBA to 40hydroxybenzoate via dechlorination as the initial step of its degradativ pathway. The genes responsible for dechlorination of 4CBA were found to be blcated on the chromosomal DNA of Pseudomonas sp. DJ-12.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.963-966
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• 2006

유비쿼터스 센서 네트워크(Ubiquitous Sensor Networks: USNs)환경은 주변 공간의 상황을 인식할 수 있고, 인식한 상황을 바탕으로 적절한 시기에 필요한 정보를 올바른 사용자나 사용자 장치에게 제공해주는 지능적인 환경을 제공한다. 이러한 환경에서 사용자의 위치정보는 매우 중요한 요소로 부각되고 있으며, 위치정보 측정을 위해 GPS(Global Positioning System)같은 위치 측정 시스템들이 개발되고 있다. 하지만, 사용자의 위치정보를 측정하는 것은 다른 한편으로 사용자의 프라이버시를 침해 할 수도 있는 심각한 보안상의 문제점을 야기시킬 수 있다. 본 논문에서는 CBS(Covert Base Station)을 이용하여 베이스스테이션만이 노드의 위치를 파악할 수 있도록 하여, 노드 및 노드 주변의 다른 어떤 노드에게도 위치가 노출되지 않도록 하기 위한 기법을 제시한다.

• Bulletin of the Korean Chemical Society
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• v.26 no.9
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• pp.1421-1426
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• 2005

The stationary point structures and relative energies between them as well as binding energies of $(CO)_2$ have been investigated at the CCSD(T) level using the correlation-consistent basis sets aug-cc-pVXZ(X=T,Q,5). It is found that while the equilibrium structure corresponds to the C-bonded T-shaped configuration with intermolecular distance of 4.4 $\AA$, there exists another minimum, slightly higher in energy ($\sim$10 $cm^{-1}$) than the global minimum, corresponding to the O-bonded T-shaped configuration with the intermolecular distance of 3.9 $\AA$. The CCSD(T) basis set limit binding energy of $(CO)_2$ is estimated to be 132 $cm^{-1}$.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.897-898
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• 2008

Array comparative genomic hybridization (aCGH) has been used to detect chromosomal regions of amplifications or deletions, which allows identification of new cancer related genes. As aCGH, a large-scale spatial data, contains significant amount of noises in its raw data, it has been an important research issue to segment genomic DNA regions to detect its true underlying copy number aberrations (CNAs). In this study, we focus on applying a segmentation method to multiple data sets. We compare two different threshold values for analyzing aCGH data with CBS method [1]. The proposed threshold values are p-value or $Q{\pm}1.5IQR$ and $Q{\pm}1.5IQR$.

• Coupled systems mechanics
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• v.6 no.3
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• pp.369-376
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• 2017

Intermolecular interaction energies and conformer geometries of the hydrogen bonded acrylamide dimers have been studied by using the second-order Møller-Plesset (MP2) perturbation theory and the density functional theory (DFT) with 17 density functionals. Dunning's correlation consistent basis sets (up to aug-cc-pVTZ) have been used to study the basis set effects. The DFT calculated interaction energies are compared to the reference energy data calculated by the MP2 method and the coupled cluster method at the complete basis set (CCSD(T)/CBS) limit in order to determine the relative performance of the studied density functionals. Overall, dispersion-energy-corrected density functionals outperform uncorrected ones. The ${\omega}B97XD$ density functional is particularly effective in terms of both accuracy and computational cost in estimating the reference energy values using small basis sets and is highly recommended for similar calculations for larger systems.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.310-312
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• 2006

유비쿼터스 센서 네트워크(Ubiquitous Sensor Networks: USNs)환경은 주변 공간의 상황을 인식할 수 있고, 인식한 상황을 바탕으로 적절한 시기에 필요한 정보를 올바른 사용자나 사용자 장치에게 제공해주는 지능적인 환경을 제공한다. 이러한 환경에서 사용자의 위치정보는 매우 중요한 요소로 부각되고 있고 위치측정기술도 개발되고 있다. 하지만, 사용자의 위치정보를 측정하는 것은 다른 한편으로 사용자의 프라이버시를 침해 할 수도 있는 심각한 보안상의 문제점을 야기시킬 수 있다. 본 논문에서는 CBS(Covert Base Station)을 이용하여 베이스스테이션만이 노드의 위치를 파악할 수 있도록 하고, 위치를 파악하는 동안 노드 및 노드 주변의 다른 어떤 노드에게도 위치가 노출되지 않도록 하기 위한 (n, t+1) 쓰레시홀드 암호화 기법을 제시한다.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.291-293
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• 2003

Applicability and economical feasibility of a Superconducting Fault Current Limiter (SFCL) have been investigated using the PSS/E simulation for a bus bar coupling at the real 154 ㎸ KEPCO power grid near Seoul. For the investigated substation, the maximum fault current exceeds the interruption rating of 4 circuit breakers (CB) out of 9 installed in the substation. The simulation showed that a SFCL installed in the bus tie position effectively limits the fault currents to save 4 CBs, which are to be replaced by ones of gloater interruption rating, otherwise. We suggest that the optimum resistance of the SFCL be 10 Ohm for the given grid.