• 대한방사선방어학회:학술대회논문집
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• 2010.04a
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• pp.54-55
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• 2010

• Annual Conference of KIPS
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• 2015.04a
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• pp.388-391
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• 2015

현재 개인정보보호법 및 정보보안에 대한 중요한 이슈가 되고 있다. 데이터 유출사고의 약 76%가 외부조직에서 발견되었고, 피해조직의 내부에서 발견된 비율 중 절반 이상이 최종 사용자에 의해 발견되었다. 관제대상과 범위가 주로 네트워크 영역으로 한정되어 있고 외부로부터 유입되는 공격에 대한 모니터링에 집중하는 보안관제 체계가 사고의 원인으로 파악되었다. 즉 내부 PC를 대상으로 하는 공격이나, 패턴기반의 탐지를 우회하는 알려지지 않은 취약점을 이용한 APT공격, 사회공학적 공격 등에는 한계를 보이는 경우이다. 향후 사물인터넷(IoT)의 증가로 인하여 더 많은 취약점 공격과 대량의 비정형 데이터가 증가할 경우 내외부적인 공격에 보안 체계가 더 체계적이고 계층적 방어 보안 모델로 대응해야 한다.

• Journal of the Korea Society of Computer and Information
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• v.6 no.1
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• pp.60-66
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• 2001

We designed a role-based access control model that can resolve the complicated tasks of control requirements. The designed access control model can control permissions efficiently use of a role-based access control. It guarantees the confidentiality integrity and availa information making use of identity-based and rule-based access controls. It can also centre information flow. Our access control model protects resources from unauthorized accesses b multi-level security policies such as role, security level, integrity level and ownership.

• Convergence Security Journal
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• v.1 no.1
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• pp.1-7
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• 2001

This paper design a role-based access control model that can resolves the complicated problems of access control requirements. In this paper, we designed an access control model which can control a permission making use up role-based access control, can guard the confidentiality, integrity and availability of information and can control illegal information flow. The designed access control model can protect resources from unauthorized accesses based on the role, multi-level security policies of security level, integrity level and ownership.

• Journal of Radiation Protection and Research
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• v.16 no.2
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• pp.67-74
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• 1991

Parameter uncertainty and sensitivity of KFOOD model for calculating the ingestion dose via terrestrial food-chain pathway was analyzed with using Monte-Carlo approach. For the rice ingestion pathway, estimated values from KFOOD code were very conservative. Most sensitive input parameters in model were deposition velocities and soil-to-plant transfer coefficient of radionuclides.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.376-384
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• 2009

This research has microstructure observation to find tissue damage mechanism and radio-protection effect on mouse kidney tissue. The result observation of a Light Microscope(LM); The kidney tissue after 5Gy irradiation observed a glomerulus atrophy, also crack distance to base membrane of a convoluted tubules. The kidney tissue after 10Gy irradiation observed out flow cytoplasm to membrane break of a convoluted tubules. The result observation of a Transmission Electron Microscope(TEM); The kidney tissue of after 5Gy irradiation has to breaking a inside cristae and membrane of mitochondria, also show definite damage of nucleus membrane. 10Gy irradiation has all the more damage a base membrane and thickness of lysosome. However, Propolis eating groups observed normal to nucleus membrane and small body of intracellular. therefore We considered "Propolis" as make radio protection function to kidney tissue of the greater part.

• Journal of Life Science
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• v.17 no.5 s.85
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• pp.664-670
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• 2007

The propolis is natural product produced by honeybees and is known to have many biologically useful properties such as anti-microbial, anti-oxidative and anti-tumorigenic activity. However, its radio-protective property has not been well studied. To investigate radio-protective effect of propolis on mouse testis, mice were supplemented with propolis after 5 Gy irradiation. The histological changes of testis were detected by TEM. The results indicate that propolis may protect tissue deformation which is induced by 5 Gy of ionizing radiation. Furthermore, to elucidate the potential molecular mechanisms involved in radio-protective property of propolis, we performed microarray experiments using oligo DNA microarray. We found 65 up-regulated genes and 224 down-regulated genes, whose expression levels were affected more than 2-fold by propolis treatment in mice irradiated at 5 Gy. We confirmed microarray data with reverse transcription-PCR using gene specific primers. The results of RT-PCR are highly correlated with those of microarray. These results may help understanding molecular mechanisms of radioprotective effects by propolis in mouse model.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.10
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• pp.993-1003
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• 2012

This paper presents a method for joint analysis of combat power and communication system performance via interoperation of a war game simulator and a communication network simulator using HLA/RTI. Effectiveness analysis of combat power has been performed by war game simulation with consideration of communication effects simulated by the network simulator. Performance analysis of a communication system has been performed by network simulation with computer forces generated by the war game simulator. Survivability of the red force and transmission power of a tactical FM radio for the blue force have been measured for the joint analysis.

• The Journal of Korean Medicine
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• v.23 no.3
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• pp.74-84
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• 2002

목적 : 본 실험에서는 gerbil을 이용한 전뇌허혈 동물모델에서 뇌허혈손상 직후 지연성 뇌손상에 대한 대황의 방어효과와 Apoptosis 과정중의 Bax와 Bcl-2 단백질에 대한 조절작용을 관찰하고, TUNEL 염색법을 통하여 대황이 gerbil hippocampus CAl영역의 pyramidal neuron의 세포사에 미치는 영향과 PCl2세포를 이용한 세포배양 모델에서의 대황의 신경방어 효과를 관찰하였다. 방법 : Mongolian gerbil의 총경동맥을 5분간 폐색하여 가역성 전뇌허혈을 유발시킨 후 대황의 전탕액을 하루에 한번 경구 투여하였다. 대황의 신경 보호 효과는 수술 7일 후에 cresyl violet으로 염색하여, 살아있는 신경 세포의 수를 세어 측정하였다. 또, 수술 3일 후에는 면역조직화학적 방범을 통하여 Bax. Bcl-2단백질의 발현과 대황의 신경보호 효과와의 관련성을 알아보았다. 결과： 가역적 전뇌허혈이 일어난 동물군의 경우 hippocampus의 CAl 영역에서 살아있는 신경세포의 수는 $51.0{\pm}2.5개{\;}/mm$에 불과하였으나, 그에 비해 수술 후 7일간 대황을 투여한 동물군은 $106.2{\pm}2.5개{\;}/mm$로 살아 있는 신경세포수가 크게 증가하였다. Apoptosis를 촉진하는 단백질인 Bax의 발현은 3일간 대황을 투여한 동물군의 경우 hippocampus의 CAl 영역에서 현저하게 저해되었고, Apoptosis를 억제하는 Bcl-2 단백질의 발현은 변화가 없었다. TUNEL assay를 통하여 살펴본 결과 대황 투여군의 apoptotic 신경세포사가 감소하였으며 이는 Bax protein의 발현과 유사한 양상을 나타내었다. 결론：대황이 Bax 단백질의 발현을 억제하여 상대적으로 Bax/Bcl-2 자연적 세포사를 억제하여 Mogolian gerbil의 가역성 전뇌허혈 모델에서 신경보호효과를 나타내는 것으로 사료된다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.1
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• pp.27-35
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• 2022

In this paper we propose white noise adding method to prevent missclassification of deep learning system by adversarial attacks. The proposed method is that adding white noise to input image that is benign or adversarial example. The experimental results are showing that the proposed method is robustness to 3 adversarial attacks such as FGSM attack, BIN attack and CW attack. The recognition accuracies of Resnet model with 18, 34, 50 and 101 layers are enhanced when white noise is added to test data set while it does not affect to classification of benign test dataset. The proposed model is applicable to defense to adversarial attacks and replace to time- consuming and high expensive defense method against adversarial attacks such as adversarial training method and deep learning replacing method.