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Analysis of a Third-Party Application for Mobile Forensic Investigation
류정현,김남용,권병욱,석상기,박진호,박종혁 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.3
Nowadays, third-party applications form an important part of the mobile environment, and social networkingapplications in particular can leave a variety of user footprints compared to other applications. Digitalforensics of mobile third-party applications can provide important evidence to forensics investigators. However, most mobile operating systems are now updated on a frequent basis, and developers are constantlyreleasing new versions of them. For these reasons, forensic investigators experience difficulties in finding thelocations and meanings of data during digital investigations. Therefore, this paper presents scenario-basedmethods of forensic analysis for a specific third-party social networking service application on a specificmobile device. When applied to certain third-party applications, digital forensics can provide forensicinvestigators with useful data for the investigation process. The main purpose of the forensic analysisproposed in the present paper is to determine whether the general use of third-party applications leaves datain the mobile internal storage of mobile devices and whether such data are meaningful for forensic purposes.
입자결합모델을 이용한 하이드레이트 함유지층의 공벽안정성 분석
류정현,이경재,박장준 한국자원공학회 2010 한국자원공학회지 Vol.47 No.2
Hydrate dissociation may cause many drilling related problems while drilling in hydrate bearing sediments (HBS). Therefore, it is necessary to analyze mechanical wellbore stability before drilling in HBS. In this study, PFC3D is used to simulate mechanical wellbore stability in HBS with a bonded particle model. Results of stability analyses are quantified by average displacement of formation particles, number of cracks, and the ratio of displacement to the hole diameter. The effects of dissociation range, in-situ stress, dissociation rate, and mudcake are analyzed. As a result, the increases of dissociation range of hydrate and in-situ stress cause formation instability by making more cracks and displacement of formation particles. On the other hand, hydrate dissociation rate and cohesion of mudcake are not critical factors in wellbore stability. Higher hydrate saturation accelerates wellbore instability. 가스하이드레이트 함유지층의 시추 시 발생하는 하이드레이트의 해리는 입자간 점착력을 감소시키고 변위를 유발하여 공벽안정성을 약화시키기 때문에 하이드레이트 층의 시추에 앞서 역학적 안정성에 대한 분석이 필수적이다. 본 연구에서는 시추공 안정성에 영향을 미치는 인자들을 파악하기 위해 입자결합모델인 PFC3D를 이용하여 시추공의 거동과 역학적 안정성을 분석하였다. 하이드레이트의 해리유무, 해리범위, 지하응력, 해리속도, 이벽(mudcake)의 존재유무와 강도 변화에 따른 각 인자들의 영향을 평균변위와 균열수, 시추공지름대비 변위로 정량화하였다. 그 결과, 해리가 발생하는 경우 해리가 일어나지 않을 때에 비해 지층의 균열과 지층입자의 변위가 큰 폭으로 증가하여 공벽안정성이 약화되었다. 민감도분석 결과, 해리범위와 지하응력은 변위와 균열을 크게 증가시키며 안정성에 매우 큰 영향을 미치는 결과를 보였다. 해리속도와 이벽에 의한 지층강도의 증가는 지층안정성에 미미한 영향을 미쳤으며, 포화도의 증가는 공벽의 불안정성을 가속화시킴을 확인하였다.
구치부 상실과 과도한 교모가 있는 환자의 수직 고경 회복을 통한 전악 보철 수복
류정현,이원섭,이철원,이수영,Ryu, Jung-Hyun,Lee, Won-Sup,Lee, Cheol-Won,Lee, Su-Young 대한치과보철학회 2018 대한치과보철학회지 Vol.56 No.3
과도한 치아의 마모는 심미적인 문제와 치아의 과민성, 수직 고경의 감소 등의 합병증이 발생한다. 본 증례는 20년 동안 류마티스 관절염 기왕력을 가진 환자를 문진, 임상적 및 방사선학적 검사를 통해 마모가 발생한 원인을 분석하고 완전 구강 회복술을 시행한 것이다. 최종보철물 제작 후 보철물 파절 예방과 안정된 측두하악관절의 유지를 위해 나이트 가드를 제작하였다. 심미적, 기능적으로 만족할만한 결과를 보였기에 이를 보고하는 바이다. Excessive teeth wear may result in the complications such as esthetic problems, hypersensitivity, and loss of vertical dimension. This clinical report focuses on the causes of severely worn dentition and the full-mouth rehabilitation of a patient with rheumatoid arthritis for 20 years. An interview, clinical and radiological examinations were performed to analyze the causes and decide the treatment plan. After delivery of the final prostheses, a night guard was used to protect the restorations and temporomandibular joints. The patient was satisfied esthetically and functionally.
류정현,김상철 원광대학교 생체재료·매식연구소 1998 원광생체재료·매식 Vol.7 No.2
Nickel and chromium are two major metals used in the alloys of most orthodontic appliances. But these metals are known to cause hypersensivity, dermatitis, and asthma. In addition, a significant carcinogenic and mutagenic potential has been demonstrated for compounds containing these metals. The purpose of this study was to find out how much nikel and chromium was released from orthodontic appliances, and which factors would influence the release. The simulated orthodontic appliances were constructed for a half of a mandibular arch and incubated in 0.05% NaCl solution at 37℃. Nickel and chromium release was quantified with an Inductively Coupled Plasma (ICP) spectroanalyzer. The results were as follows : 1. From simulated orthodontic appliances, nickel was released 9.83-70.0 ㎍/day but the release of chromium was not detectable in limit of 10ppb. 2. The amount of nickel release was significantly different between the types of appliances. 3. The galvanic condition increased the amount of nickel release, which was not statistically significant. 4. The sand blasting increased the amount of nickel release, which was also not statistically significant.
류정현,오소택,강경화,김상철 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.5
니켈과 크롬은 대부분의 교정장치를 제작하는데 사용되는 합금을 구성하는 주요한 금속이다. 그러나 이들 금속은 과민반응, 피부염, 천식 등의 주요한 원인이 되며, 이들 금속의 우발적인 흡입에 의해 암이 유발될 수 있음이 보고된바 있다. 이에 하악 standard edgewise 브라켓을 이용한 사분악의 교정 장치를 37℃, 0.05% NaCl 용액에 저장하여 교정장치의 부식에 의해 유리된 니켈과 크롬을 Inductively Coupled Plasma(ICP) spectroanalyzer를 이용하여 측정하였다. 교정장치로부터, 1일 평균 9.83-70.0㎍/day의 니켈이 유리되었으나, 크롬은 10ppb 측정한계에서 측정불가능 하였다. 니켈 유리량은 제품에 따라 유의한 차이를 가져왔다. Galvanic 조건이나 Sand blasting 처리는 니켈 유리량에 증가를 가져왔으나 통계학적으로 유의하지 않았다. Nickel and chromium are two major metals used in the alloys of most orthodontic appliances. But these metals arc known to cause hypersensitivity, dermatitis, and asthma. In addition, a significant carcinogenic and mutagenic potential has been demonstrated for compounds containing these metals. The purpose of this study was to find out how much nickel and chromium was released from orthodontic appliances, and which factors would influence the release. The simulated orthodontic appliances were constructed for a half of a mandibular arch and incubated in 0.05% NaCl solution at 37℃. Nickel and chromium release was quantified with an Inductively Coupled Plasma (ICP) spectroanalyzer. The results were as follows 1. From simulated orthodontic appliances, nickel was released 9.83-70.0㎍/day but the release of chromium was not detectable in limit of l0ppb. 2. The amount of nickel release was significantly different between the types of appliances. 3. The galvanic condition increased the amount of nickel release, which was not statistically significant. 4. The sand blasting increased the amount of nickel release, which was also not statistically significant.