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폭발용사에 의한 내에로젼성 서멧 피막 코팅에 관한 연구
김현근,남인철,오재환 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.1
The properties of the detonation sprayed cermet coating are investigated through the mechanical, corrosion and erosion test. The test results are also compared with the properties of the substrate materials, STS 329J1, dual phase stainless steel and the plasma sprayed cermet coatings. The two kinds of carbide cermet power, WC+NiCr, Cr$_3$C$_2$+NiCr were used in this experiment. The experimental results showed that the anti-corrosive and anti-erosive properties of the detonation sprayed cermet coatings are superior to the plasma sprayed cermet coatings. The WC+NiCr cermet coating appears to be more effective than Cr$_3$C$_2$+NiCr cermet coating in abrasive erosion environment, whereas the Cr$_3$C$_2$+NiCr cermet coatings are more effective in cavitation erosion environment.
해군분석모델용 AI-CGF를 위한 시나리오 생성 모델 설계(I): 진화학습
김현근,강정석,박강문,김재우,김장현,박범준,지승도 한국군사과학기술학회 2022 한국군사과학기술학회지 Vol.25 No.6
Military training is an essential item for the fundamental problem of war. However, there has always been a problem that many resources are consumed, causing spatial and environmental pollution. The concepts of defense modeling and simulation and CGF(Computer Generated Force) using computer technology began to appear to improve this problem. The Naval Operations, Resources Analysis Model(NORAM) developed by the Republic of Korea Navy is also a DEVS(Discrete Event Simulation)-based naval virtual force analysis model. The current NORAM is a battle experiment conducted by an operator, and parameter values such as maneuver and armament operation for individual objects for each situation are evaluated. In spite of our research conducted evolutionary, supervised, reinforcement learning, in this paper, we introduce our design of a scenario creation model based on evolutionary learning using genetic algorithms. For verification, the NORAM is loaded with our model to analyze wartime engagements. Human-level tactical scenario creation capability is secured by automatically generating enemy tactical scenarios for human-designed Blue Army tactical scenarios.
김현근,최순욱,안주영,박상준,김윤권,김소연,조재현 대한감염학회 2009 Infection and Chemotherapy Vol.41 No.6
Extrapulmonary tuberculosis, such as intestinal tuberculosis, has become more common with the increase in human immunodeficiency virus infection. However, the diagnosis and treatment of intestinal tuberculosis are often delayed because the symptoms are nonspecific and diverse. We experienced a case of AIDS with intestinal tuberculosis that manifested as a duodenal fistula. The presence of AIDS should be suspected in patients who have extrapulmonary tuberculosis with atypical presentations.