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슬래머 웜 전파과정 분석을 위한 네트워크 모델링 및 시뮬레이터 구현
임재명,윤종호,Lim, Jae-Myung,Yoon, Chong-Ho 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.5B
본 논문에서는 2003년 국내 뿐만 아니라 전세계의 인터넷망에서의 심각한 소통장애를 일으켰던 슬래머 웜 보안공격의 전파과정에 대한 새로운 통신망 모델을 제시하고 NS-2를 이용한 시뮬레이터를 구현하여 웜 보안공격에 의한 전파과정을 분석하였다. 기존 DN-AN모델을 Abstract network-Abstract network(AN-AN)모델로 추상화함으로써 국내 뿐만 아니라 전 세계의 수많은 호스트를 대상으로 한 대규모 인터넷망에 대하여 최초의 웜 패킷이 국내의 인터넷 국제관문국으로 유입된 시점부터 국내의 망이 포화되는 전 과정을 시간대별로 분석할 수 있는 NS-2용 시뮬레이터를 구현하였다. 또한 구현된 시뮬레이터는 감염된 국내의 호스트에 의해 국외의 호스트를 감염시키는 과정도 분석 가능하였다. 시뮬레이션 결과 290초만에 8,848개의 국내 호스트가 감염되었고, 308초만에 66,152개의 국외 호스트가 감염되었다. 또한 공격시 수행되는 웜 감염 전파과정에 의해 국내로 유입되거나 국외로 유출되는 웜 감염패킷들은 국제관문국에서 각각 154초와 135초내에 포화됨을 알 수 있었다. In this paper, we present a simulation model of Slammer worm propagation process which caused serious disruptions on Internet in the you of 2003 and analyze the process of Slammer by using NS-2. Recently introduced NS-2 modeling called "Detailed Network-Abstract Network Model" had enabled packet level analysis. However, it had deficiency of accommodating only small sized network. By extending the NS-2 DN-AN model to AN-AN model (Abstract Network-Abstract Network model), it is effectively simulated that the whole process from the initial infection to the total network congestion on hourly basis not only for the Korean network but also for the rest of the world networks. Furthermore, the progress of the propagation from Korean network to the other country was also simulated through the AN-AN model. 8,848 hosts in Korean network were infected in 290 second and 66,152 overseas hosts were infected in 308 second. Moreover, the scanning traffics of the worm at the Korean international gateway saturated the total bandwidth in 154 seconds for the inbound traffic and in 135 seconds for the outbound one.
임재명(Jae Myoung Rim),김병욱(Byeoung Ug kim),강성환(Sung Hwan Kang) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.4
This research aims to improve the previous trench process. The modified process is consist of 3 processes; first settling tank, 3-staged second contact-filter, and last trench system. The experiments was operated by varying the HRT 8, 6 and 4 hours in trench. The results of laboratory experiments showed removal rate of 97∼99% of TBOD, 92∼98% of TKN, 91∼98% of T-P. From the results of this research, organic materials were removed in settling tank and nutrients in the trench stage. Therefore, it is recommended to replace the previous 3-staged contact-filter to 1-staged one, and to increase contact-time in trench system.
생물학적 황산염 환원을 이용한 금속광산 갱내수의 중금속 제거
임재명,이찬기,한동준 ( Jay Myoung Rim,Chan Ki Lee,Dong Joon Han ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
A laboratory experiment was performed to investigate the mine drainage treatment using the biological sulfate reduction. An acetate-added synthetic wastewater was used because of low organic content in the acid mine drainage. The presence of heavy metals in the synthetic wastewater was an operational variable for the laboratory experiment. On the basis of series of experiment, it was found that the sulfate reduction rate and organic removal rate increased with an increment of hydraulic retention time in the laboratory reactors. It was also note that the reactor fed with wastewater containing heavy metals showed a better performance. It was reasoned that the reduction of sulfide(S^2) toxicity due to the heavy metal complexation, resulting an enhanced microbial activity in the reactor fed with wastewater containing heavy metals. Total removal rate of heavy metals in the lab reactor was highly correlated with the sulfate reduction rate, and the sulfate reduction rate was closely related with COD removal rate. In addition, an order of heavy metal removals during the sulfate reduction was found as follows : Zn>Pb>Co>Ni>Cu.
임재명,한동준 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-
This study aims to develop the combined septic tank for middle-small scale sewage treatment. The developed process were circular and separate type. The circular combined septic tank was controlled sludge discharge and could be modified the advanced treatment system. The separate combined septic tank was could be applicated wastewater that discharge flow was varied, and was could be maintained F/M ratio constantly. The optimum hydraulic retention time was about 16 hours.
생물학적 황산염 환원올 이용한 금속광산 갱내수의 증금속 제거
임재명,이찬기,한동준 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
A laboratory experiment was performed to investigate the mine drainage treatment using the biological sulfate reduction. An acetate- added synthetic wastewater was used because of low organic content in the acid mine drainage. The Presence of heavy metals in the synthetic wastewater was an operational variable for the laboratory experiment. On the basis of series of experiment, it was found that the sulfate reduction rate and or-ganic removal rate increased with an increment of hydraulic retention time in the laboratory reactors. It was also note that the reactor fed with wastewater containing heavy metals showed a better Performance. It was reasoned that the reduction of sulfide(S^(2-)) toxicity due to the heavy metal complexation, resulting an enhanced microbial activity in the reactor fed with wastewater containing heavy metals, Total removal rate of heavy metals in the lab re-actor was highly correlated with the sulfate reduction rate, and the sulfate reduction rate was closely related with COD removal rate. In addition, an order of heavy metal removals during the sulfate reduction was found as follows : Zn >Pb >Co>Ni>Cu