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디지털 증거분석에 있어서 USB 메모리 복구 - 물리적인 측면과 논리적인 측면에서의 접근 -
장기식,유만균,김광남,박종혁 한국디지털포렌식학회 2007 디지털 포렌식 연구 Vol.1 No.1
일상생활에서 휴대의 용이성과 충분한 저장용량을 제공하는 USB 메모리가 널리 사용되고 있다. 이로 인하여 USB 메모리를 사이버 범죄 수사에 있어서 필수 압수대상물이 되고 있다. 그러나 용의자는 자신의 범죄를 은폐하기 위하여 고의로 USB 메모리를 체포직전에 파손하는 일도 증가하고 있다. 이런 관점에서 USB 메모리에서 데이터를 복구 ․ 추출하는 것은 매우 중요한 일이 아닐 수 없다. USB 메모리가 파손된 경우에는 반드시 물리적인 수리를 거친 후에 논리적인 복구를 실시하여야만 한다. 이에 맞추어 본 논문에서는 물리적인 손상이 있을 시에 복구하는 과정에 대한 설명을 하고, 물리복구가 이루어진 후에 논리적으로 데이터를 복구할 수 있는 방법을 다룬다. Since USB thumb drives are widely used nowadays, they have become as a target of seizure in most criminal investigations. Some criminals are willing to break USB memory drives for covering the crime up. Thus it is important to repair the physically damaged USB drives and to retrieve information related to the crime. In this paper, we explain how to repair the physically damaged USB drives and how to recover the data from them.
動物性原料飼料에서 salmonella 屬菌의 分離, 生存性 및 初生雛에 대한 實驗的 感染
Ki Sik CHANG(張紀植),Byoung Gon CHUNG(鄭丙坤),Ho Jo KANG(姜鎬祚) 한국예방수의학회 1988 예방수의학회지 Vol.12 No.2
This survey was carried out to investigate for contamination rate and survival of Salmonella in animal feed ingredients. Also examined were the Pathogenicity of the isolates in infant chick by experimental inoculation. A total of 260 samples of finished feed and feed ingredients were randomly collected from feed mills in Pusan area from April to September 1986. Salmonella contamination rate in fish meal and bone meal were 5.1% and 1.4%, respectively, but none of the Salmonella was isolated from 92 samples of finished feed. Contamination 1 evels of Salmonella in 6 positive samples of feed ingredients ranged from 21 to 1100 per 100g in calculation by most probable numver(MPN) technique. Of the 11 Salmonella strains identified, 8 were typed as 4 strains of S.derby and each 2 strains of S.enteritidis and S.infantis, and 3 strains were untypable. All of the 11 isolates were susceptible to chloramphenicol and kanamycin, while some of the strains were resistant in order of prevalence to ampicillin. penicillin, streptomycin and tetracyline. Viable counts of S.derby and S.infantis in experimental inoculation were reduced from log 4.4-4.8 to log 2.7-3.3 in animal feed ingredients after storage for 16 weeks at 25℃. In oral inoculation with 10⁵ cut of Salmonella isolates into infant chicks aged 1 to 3 days, S.enteritidis, and S.infantis were found to bedischarged in feces 3 days afterwards, and these two stains and S.derby were detected from 50, 60 and 70% of the chick, repectively, 7 days after inoculation. S.enteritidis, S.derby and S.infantis were recovered respectively from about 60% of contents of small intestine and cecum and 30, 10 and 20% of liver 7 days after inoculation.