• Journal of Navigation and Port Research
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• v.34 no.3
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• pp.161-166
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• 2010

The bandwidth of detecting radars used for military purpose is increasingly broadened, and recently, the frequency band of the detecting radars is expanding to millimeterwave bands of the millimeterwave bands of 35 GHz and 94 GHz. Since, especially, it is essential and important to fabricate and develop EM wave absorber with the absorption ability more than 10 dB in 94 GHz band, the EM wave absorber was manufactured based on the design method by FDTD simulation. As a result, the developed EM wave absorber with the composition ratio of Binder(CPE with additional materials) : Carbon = 70 : 30 wt.% has the thickness of 0.7 mm and the absorption ability more than 14 dB in the frequency range of 94 GHz.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.10a
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• pp.54-55
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• 2009

The bandwidth of detecting radars used for military purpose is increasingly broadened, and recently, the frequency band of the detecting radars is expanding to millimeterwave bands c! the millimeterwave bands of 35 GHz and 94 GHz. Since, especially, it is essential and important to fabricate and develop EM wave absorber with the absorption ability more than 10 dB in 94 GHz band, the EM wave absorber was manufactured based on the design method by FDTD simulation As a result, the developed EM wave absorber with the composition ratio of Binder(CPE with additional materials) : Carbon = 70 : 30 wt.% has the thickness of 0.7 mm and the absorption ability more than 14 dB in the frequency range of 94 GHz.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.223-227
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• 2006

The millimeter-wave radar is positioned as a key, basic ITS technology supporting safe driving, because millimeter wave allows radar to see small distant objects. This system is considered the collision-avoidance radar available in some cars. This system employs poised radar operating within the frequency range $76\sim77GHz$. Radar systems create two major problems(false images and system-to-system interference). False echoes cause driving hazards. These problems can be eliminated through the use of EM wave absorber. Therefore, we designed and fabricated EM wave absorber using permalloy. It has the thickness of 1.4 mm with composition of permalloy:CPE=70:30 wt% and absorption ability higher than 18 dB in the frequency range $76\sim77GHz$.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.32 no.2
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• pp.243-253
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• 2022

Recently, cyber attacks on national infrastructure facilities have continued to occur. As a result, the vulnerabilities of ICS-CERTs have more than doubled from last year, and the vulnerabilities to industrial control systems such as nuclear facilities are increasing day by day. Most control system operators formulate vulnerability countermeasures based on the vulnerability information sources of industrial control systems provided by ICS-CERT in the United States. However, it is difficult to apply this to the security of domestic control systems because ICS-CERT does not contain all relevant vulnerability information and does not provide vulnerabilities to domestic manufacturer's products. In this research, we will utilize publicly available vulnerability-related information such as CVE, CWE, ICS-CERT, and CPE to discover vulnerabilities that may exist in control system assets and may occur in the future. I proposed a plan that can predict possible vulnerabilities and applied it to information on major domestic control systems.

• Smart Media Journal
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• v.11 no.11
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• pp.75-83
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• 2022

NIST in the United States has developed SCAP, a protocol that enables automated inspection and management of security vulnerability using existing standards such as CVE and CPE. SCAP operates by creating a checklist using the XCCDF and OVAL languages and running the prepared checklist with the SCAP tool such as the SCAP Workbench made by OpenSCAP to return the check result. SCAP checklist files for various operating systems are shared through the NCP community, and the checklist files include ID, title, description, and inspection method for each item. However, since the inspection items are simply listed in the order in which they are written, so it is necessary to classify and manage the items by type so that the security manager can systematically manage them using the SCAP checklist file. In this study, we propose a method of extracting the description of each inspection item from the SCAP checklist file written in OVAL language, classifying the categories through a machine learning model, and outputting the SCAP check results for each classified item.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.18 no.1
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• pp.19-25
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• 2022

Nuclear Power Plants (NPP) should be designed to have sufficient safety margins and to ensure seismic safety against earthquake that may occur during the plant life time. After the 9.12 Gyeongju earthquake accident, the structural integrity of nuclear power plants due to the beyond design basis earthquake is one of key safety issues. Accordingly, it is necessary to conduct structural integrity evaluations for domestic NPPs under beyond design basis earthquake. In this study, the Level 3 LBB (Leak Before Break) evaluation was performed by considering the beyond design basis earthquake for the surge line of a OPR1000 plant of which design basis earthquake was set to be 0.2g. The beyond design basis earthquake corresponding to peak ground acceleration 0.4g at the maximum stress point of the surge line was considered. It was confirmed that the moment behaviors of the hot leg and pressurized surge nozzle were lower than the maximum allowable loading in moment-rotation curve. It was also confirmed that the LBB margin could be secured by comparing the LBB margin through the Level 2 method. It was judged that the margin was secured by reducing the load generated through the compliance of the pipe.

• Journal of Life Science
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• v.30 no.3
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• pp.230-238
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• 2020

Carcass traits are the most economically important traits in Hanwoo (Korean cattle). Recently, the development of the field of genomics has made it possible to identify DNA markers for the genetic evaluation of carcass and meat quality traits in beef cattle. The objective of this study was to assess the genetic effects of single nucleotide polymorphism (SNP) markers related to carcass traits by field evaluations in a commercial Hanwoo population. We evaluated 15 SNP markers (TG g.371T>C, APM1 g.1454G>A, FABP4 g.2834C>G, FABP4 g.3533T>A, FABP4 g.3691G>A, SCD g.10153A>G, SCD g.10329T >C, CPE g.601T>C, EDG1 g.166A>G, NPY g.4271T>C, GPD1 g.2766C>T, PDE1B g.17122A>G, PDE1B g.17507A>C, TNNT1 g.6650C>T, and RORC g.20152A>G) related to carcass traits in Hanwoo. Genotyping of these SNP markers was performed using PCR-RFLP analysis in Hanwoo steers (n = 1,536) to evaluate their association with carcass traits. Seven SNPs, APM1 g.1454G>, FABP4 g.3691G>A, SCD g.10153A>G, CPE g.601T>C, PDE1B g.17122A>G, TNNT1 g.6650C>T, and RORC g.20152A>G, were significantly associated with carcass traits such as marbling score (MS), backfat thickness (BF), musculus longissimus dorsi area (LDA), carcass weight (CW), meat grade (MG), meat color (MC), and maturity score (MA). The results suggest that these SNPs may be used as DNA markers for the selection of Hanwoo with higher meat quality.

• Bulletin of the Korean Chemical Society
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• v.28 no.10
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• pp.1729-1734
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• 2007

The electrochemical behaviors of estrone in the presence of various surfactants were examined with great details. It is found that a cationic surfactant, cetyltrimethylammonium bromide (CTAB), obviously facilitates the electro-oxidation of estrone at carbon paste electrode (CPE) from the significant peak current enhancement and the negative shift of peak potential. Additionally, chronocoulometry and electrochemical impedance spectroscopy (EIS) were also used for further investigation of the electrode process of estrone, indicating that low concentration of CTAB exhibits excellent enhancement effects on the electrochemical oxidation of estrone, greatly enhances the diffusion coefficient and the electron transfer rate. Based on this, an electrochemical method was proposed for the determination of estrone. The oxidation peak current is proportional to the concentration of estrone in the ranges over 9.0 × 10?8 - 8.0 × 10?6 mol/L, and a low detection limit of 4.0 × 10?8 mol/L was obtained for 180s accumulation at open circuit (S/N = 3). Finally, this proposed method was demonstrated using estrone tablets with good satisfaction.

• Information and Communications Magazine
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• v.24 no.9
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• pp.49-59
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• 2007

본 논문에서는 IEEE 802.22 WRAN 표준화 중심으로 진행되고 있는 스펙트럼 센싱 기술에 관련된 내용들을 살펴보고 현재 IEEE 802.22 WG에 제안된 스펙트럼 센싱 기술들을 간략하게 소개하고 있다. 그리고 본논문에서는 IEEE802.22 표준화에 제안된 각사의 센싱기술들 중에서 최종적으로 표준안의 부록을 채택하는 방법으로 활용되었던 센싱기술 성능평가 방법인 다섯 가지 시뮬레이션 시나리오들에 대하여 설명하고 있다. 그런데 현재 IEEE 802.22 표준화에 제안된 센싱기술들은 Working Group에서 제시한 12개로 이루어진 DTV 신호 파일에 의해 센싱기술의 성능 검증을 위한 시뮬레이션을 수행하고 있다. 이의 DTV 신호들은 와싱톤 도심지 및 뉴욕에서 수집되었는데, 도심지, 교외, 주거지역 및 시골지역, 그리고 옥내외 채널환경 등 다양한 채널환경에서 수집된 신호들이다. 그리고 본 논문에서는 스펙트럼센싱 시스템의 구성을 제시하고 있고, 제시된 스펙트럼 센싱 구조에서 스펙트럼관리기능모듈, 스펙트럼센싱 기능 모듈, 그리고 채널집합분류기능 모듈에 대한 CPE와 기지국의 역할을 설명하고 있다. 또한 coarse 센싱 방법과 fine 센싱 방법의 결합으로 제시될 수 있는 hybrid 센싱 방법으로 incumbent 신호세기 및 센싱 단계에 따라 고속의 스펙트럼 센싱 타임(sensing time)을 도모할 수 있는 스펙트럼 센싱 과정을 제시하고 있다.

• KSBB Journal
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• v.11 no.4
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• pp.489-496
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• 1996

Metal dispersed carbon paste electrodes were fabricated, and their electrochemical properties were investigated. Among various metal dispersed carbons, platinum-dispersed carbon paste electrode showed most efficient electrocatalytic characteristics. The overpotential for the oxidation of NADH was significantly lowered in the platinum-dispersed carbon paste electrode, and catalytic current was also enhanced. Based on these electrocatalytic observations, L-lactate biosensor using L-lactate dehydrogenase was constructed to evaluate its performance in terms of sensitivity and stability.