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김대식,김용현,Kim, Daesik,Kim, Yonghyun 한국인터넷정보학회 2017 인터넷정보학회논문지 Vol.18 No.5
전 세계를 활동영역으로 하는 현대 사회의 사이버전의 공격 기술은 날로 보다 정교해지고 새로운 공격의 출현 주기가 점점 짧아지고 있으며 이를 해결할 방어 기술 및 전문 인력은 매우 부족한 실정이다. 이러한 문제를 해결하기 위한 노력 중의 하나로 세계 각국은 사이버전을 대비하는 테스트 베드로써 사이버 레인지를 고려하고 있다. 본 논문은 사이버 레인지의 해외사례 및 유사 체계를 조사하면서 각종 요소를 수집 및 분석하였으며 시스템 엔지니어링 과정을 통하여 이를 체계적으로 분류하였다. 그 과정 중에 유도되는 임무 및 운영 개념을 아키텍처 프레임워크에 맞게 설정하였으며 사이버 레인지의 논리적 아키텍처를 작성하였다. 작성된 아키텍처를 활용하여 방어 기술 및 전문 인력 확보란 두 가지 목표를 달성하는 동시에 효율성 및 지속성을 확보하는 운용 방안을 제시하였다. In the whole world the Attack Technologies of cyber warfare in modern society are growing faster and complicated. The frequency of the new attacks is shorter than before day by day. The defense technologies and experts against these attacks are very few. One of answers to solve these problems is the cyber range as a test-bed to prepare the cyber warfare considered by many countries. This paper examines the foreign cases and similar systems, collects and analyzes various attributes for cyber range. Finally it refines them through system engineering processes. In these processes missions and concepts for administration are set with architecture framework. The logical architecture is designed. Based on designed architecture two goals, defense technologies and procurement of experts, are established. And it shows effective and persistent administration of cyber range.
김대식(Daesik Kim),김주원(Juwon Kim),소진섭(JinSub So),김진우(Jinwoo Kim),정형일(Hyeongil Jeong),이성준(Seoungjun Lee),김용한(Yonghan Kim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
철도운영의 효율화와 최적의 유지보수를 위해서는 KTK, KTX-산천, 전동차와 같이 고정 편성으로 동일한 차종으로 구성하여 운행하는 것이 가장 효율적이며, 이런 이유로 국내는 물론 세계적으로 동종의 차량으로 열차 운행 다이아를 설정하고 있으며, 화물열차도 최대한 동일 사양으로 묶어 운행을 하고 있다. 본 연구는 국가R&D 사업으로 개발하고 있는 2층 고속열차, 고속화물열차 및 여객/화물 복합열차의 종합편성시험을 위한 안전 및 인터페이스 측면에서 고려되어야 할 사항에 대하여 연구하고 분석하였다. In light of operational efficiency and maintenance effectiveness, it is the most effective way that a train is composed of same cars such as KTX, KTX-Sancheon and Electric Multiple Unit. Therefore, world trend of a train formation is toward the same kind of cars’ and even a freight train often run with the same kind of cars. This study is aimed at analysis of essential elements about safety and interface of a developing high speed train which is composed of duplex passenger cars and passenger/freight complex cars.
가스터빈 연소기 난류 비정상 화염으로부터의 화학발광 측정
김대식(Daesik Kim),이종근(Jong Guen Lee),Domenic Santavicca 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO2* background level in the CH* and OH* band. The test results show that the effct of CO2* level in the CH* band is greater than that in the OH* band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio, almost regardless of a change in the inlet velocity.
가스터빈 희박 예혼합 연소기에서의 화염의 동적 거동에 관한 연구
김대식(Daesik Kim),이종근(Jong Guen Lee),Domenic Santavicca 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
This paper describes the forced flame response in a turbulent premixed gas turbine combustor. The fuel was premixed with the air upstream of a choked inlet to avoid equivalence ratio fluctuations. To impose the inlet flow velocity, a siren type modulation device was developed using an AC motor, rotating and static plates. Measurements were made of the velocity fluctuation in the nozzle using hot wire anemometry and of the heat release fluctuation in the combustor using chemiluminescence emission. The test results showed that flame length as well as geometry was strongly dependent upon modulation frequency in addition to operating conditions such as inlet velocity. Convection delay time between the velocity perturbation and heat release fluctuations was calculated using phase information of the transfer function, which agreed well with the results of flame length measurements. Also, basic characteristics of the flame nonlinear response shown in the current test conditions were introduced.
난류 예혼합 연소기에서의 흡입 유동 섭동에 대한 화염의 동적 거동
김대식(Daesik Kim) 한국연소학회 2009 한국연소학회지 Vol.14 No.4
This paper describes the forced flame response in a turbulent premixed gas turbine combustor. The fuel was premixed with the air upstream of a choked inlet to avoid equivalence ratio fluctuations. To impose the inlet flow velocity, a siren type modulation device was developed using an AC motor, rotating and static plates. Measurements were made of the velocity fluctuation in the nozzle using hot wire anemometry and of the heat release fluctuation in the combustor using chemiluminescence emission. The test results showed that flame length as well as geometry was strongly dependent upon modulation frequency in addition to operating conditions such as inlet velocity. Convection delay time between the velocity perturbation and heat release fluctuations was calculated using phase information of the transfer function, which agreed well with the results of flame length measurements. Also, basic characteristics of the flame nonlinear response shown in the current test conditions were introduced.
가스터빈 연소기에서 CO₂<SUP>*</SUP> 배경 강도가 OH<SUP>*</SUP> 및 CH<SUP>*</SUP> 화학 발광 강도에 미치는 영향
김대식(Daesik Kim),이종근(Jong Guen Lee) 한국연소학회 2010 한국연소학회지 Vol.15 No.4
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of CO₂<SUP>*</SUP> background level in the CH<SUP>*</SUP> and OH<SUP>*</SUP> band. The test results show that the effect of CO₂<SUP>*</SUP> level in the CH* band is greater than that in the OH<SUP>*</SUP> band. Also, the background to peak ratio for both CH* and OH* bands can be expressed as a function of equivalence ratio, almost regardless of a change in the inlet velocity.