http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
안전한 리눅스 시스템을 위한 E-BLP 보안 모델과 구현
강정민,신욱,박춘구,이동익,Kang, Jung-Min,Shin, Wook,Park, Chun-Gu,Lee, Dong-Ik 한국정보처리학회 2001 정보처리학회논문지 A Vol.8 No.4
대부분의 안전한 운영체제는 주체와 객체에 보안 등급을 부여하여 운영하는 다중등급 정책(MLP:Multi-Level Policy)을 수용하고 있으며, BLP(Bell and LaPadula) 모델은 이 정책을 표현하는 검증된 대표적인 모델이다. 하지만 BLP 모델을 적용한 안전한 운영체제들은 사용자의 보안 등급을 프로세스에 그대로 상속하고 있음을 알 수 있다. 이러한 접근방법의 문제점은 프로세스를 전적으로 신뢰할 수 없다는 것에서 기인한다. 즉, 사용자의 보안 등급과 권한허용 범위를 오류가 내재되어 있거나 의도적으로 수정된 악의적인(malicious) 프로세스에게 그대로 상속할 경우, 시스템 안전성이 파괴될 가능성이 있다. 이는 BLP 모델이 접근 주체를 정의함에 있어서 시스템 사용자와 실제 그 접근을 대행하는 프로세스를 동일시 하도록 단순하게 정의하고 있기 때문이며, 따라서 사용자와 프로세스간 신뢰관계를 모델에 도입함으로써 해결 가능하다. 또한 다중등급 보안 운영체제들은 접근 주체인 프로세스가 접근 객체로서 존재하는 등급화 된 프로그램 실행 시, 새로운 프로세스를 위한 보안 등급을 부여해야 하는데, 접근 주체와 접근 객체의 보안 등급이 다를 경우, 보안 등급 결정 문제가 발생하며 정보보호의 목적에 위배되는 결과가 발생한다. 이에 본 논문에서는 프로세스의 신뢰성을 고려하고, 보안 등급 결정 문제를 해결할 수 있는 확장된 BLP(E-BLP) 보안 모델을 제안하고 리눅스 커널(2.4.7)에 구현한다. To design and develop secure operating systems, the BLP (Bell-La Padula) model that represents the MLP (Multi-Level Policy) has been widely adopted. However, user\`s security level in the most developed systems based on the BLP model is inherited to a process that is actual subject on behalf of the user, regardless whatever the process behavior is. So, there could be information disclosure threat or modification threat by malicious or unreliable processes even though the user is authorized in the system. These problems can be solved by defining the subject as (user, process) ordered pair and by defining the process reliability. Moreover, when the leveled programs which exist as objects in a disk are executed by a process and have different level from the process level, the security level decision problem occurs. This paper presents an extended BLP (E-BLP) model in which process reliability is considered and solves the security level decision problem. And this model is implemented into the Linux kernel 2.4.7.
임플랜트 Overdenture의 Bar설계에 따른 하악지지조직의 광탄성학적 응력분석
강정민,방몽숙,Kang Jeong-Min,Vang Mong-Sook 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.2
This study was performed to evaluate the effects of number and alignment of implant fixture and various bar designs on the retention of denture and the stress distribution. Six kinds of photoelastic mandibular models and nine kinds of overdenture specimens were designed. A unilateral vertical load was gradually applied on the right first molar to calculate the maximal dislodgement load of each specimen. A unilateral vertical load of 17 Kgf was applied on the right first molar and a vertical load of 10 Kgf was applied on the interincisal edge region. The stress pattern which developed in each photoelastic model was analyzed by the reflection polariscope. The results obtained were as follows: 1. The maximal dislodgement load reversely increased with the distance from the loading point to the implant fixture, while it linearly increased with that from the most posterior implant fixture to the mesial clip. The maximal dislodgement load also increased with the use of a cantilever bar. 2. Under the posterior vertical load, the stress to the supporting tissue of the denture base increased with the distance from the loading point to the implant future. The stress concentration on the apical area of the implant future reversely increased with the distance from the loading point to the implant future. 3. In the overdentures supported by two implant fixtures under the posterior vertical load. the specimen implanted on lateral incisor areas with a cantilever bar exhibited more favorable stress distribution than that without a cantilever bar. The specimen implanted on the canine areas without a cantilever bar, however, exhibited more favorable stress distribution. 4. In the overdentures supported by three implant fixtures. the specimen implanted ell the midline and canine areas exhibited more favorable stress distribution than that implanted oil the midline and the first premolar areas. 5. In the overdentures supported by four implant fixtures. the specimen implanted with two adjacent implant fixtures exhibited more favorable stress distribution than that implanted at equal distance under the posterior vertical load. 6. Under the anterior vertical load, the overdentures supported by three implant fixtures exhibited stress concentration on the supporting structure of the middle implant future. In overdentures supported by two or four implant futures, no significant difference was noted in stress distribution between the types of bars. These results indicate that the greater the number of implant fixtures, the better the stress distribution is. A favorable stress distribution may be obtained in the overdentures supported by two or three implant fixtures, if the location and the design of the bar are appropriate.
국내 주요 치의학 학술지에 게재된 장애인치과학 관련 논문 분석
강정민(Chungmin Kang),이제호(Jae-Ho Lee),이효설(Hyo-Seol Lee) Asia association of Disability and Oral health 2013 International Journal of Disability and Oral Healt Vol.9 No.1
This paper classified the articles of special needs dentistry(SND) published in Korean medical database according to thematic distribution and chronological change to assess recent academic trends and indicate the direction of study in the future. We selected articles in 17 dental journals registered with the Korea Research Foundation. This study found that the total number of articles of SND was 292 in 17 journals from 1973 to 2012. The biggest number of articles of SND was published in the journal of the Korean Academy of Pediatric Dentistry, which means pediatric dentists contribute to dental treatment of people who need special care. According to growing number of people with disabilities, the number of articles related in SND has been increased since 2000. Also, the aged and children as well as people with disabilities fit into the category of SND and the scope of SND has been enlarged. So dentists should concern and study more about SND in the future.
강정민(Kang, Jeong-Min),강석진(Kang, Seok-Jin) 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.2
The purpose to this study was to derive environmental design elements (planning indicators) and conduct field survey to prevent child abuse in kindergarten. The framework of the field survey analysis divided the physical environment into boundary, external, internal and management areas. The indicators were compiled from the perspective of CPTED by reference to prior studies and related reports. The results of this study, the guidelines of the relevant agencies were insufficient in the research and guide of child abuse perspectives. And, field survey did not have difficulty using the indicators. A follow-up study will verify the adequacy of the indicators with experts.
맟춤형 정보제공을 위한 RSS 기반 교육정보시스템의 개발
강정민(Kang Jeong Min),전석주(Chun Seok Ju) 한국컴퓨터정보학회 2007 韓國컴퓨터情報學會論文誌 Vol.12 No.5
본 연구에서는 교사, 학생 및 학부모와 같은 교육정보 사용자들에게 맞춤정보를 제공하는 RSS 기반 교육정보시스템을 개발한다. 다양한 교육정보 웹페이지로부터 교육정보를 수집하기 위해서 우리는 웹기반 RSS 리더기를 설계한다. 웹기반 RSS 리더기는 RSS를 제공하는 해당사이트나 블로그 등의 URL의 주소를 입력받아 RSS 파일인지를 인식하고 파서에 로드하여 XML 문서로 생성하고 분류하여 시스템에 등록한다. 시스템에 등록된 문서에 해당되는 웹페이지에 새로운 정보가 업데이트 되면 자동으로 이를 수집하여 사용자에게 제공해준다. 따라서 사용자들은 자신에게 적합한 정보를 얻기 위해 일일이 해당되는 사이트를 검색하지 않고서도 실시간으로 맞춤형 교육정보를 제공받을 수 있다. In this study, we develop a RSS-based educational information system for providing users, such as teachers, students, and parents of students with an adapted information. In order to collect an educational information from diverse web pages we design a web-based RSS reader. The RSS reader reads RSS files from the web sites or blogs which provide RSS feeds and then creates XML documents. The created XML documents are classified and registered into the system. Whenever the registered web-pages are updated, the system can automatically collect the updated information and provide the user with it. Therefore the user can be provided a real-time adapted educational information without searching web-sites from the system.
가족샘종폴립증에 대한 전대장직장절제술 후 회장낭에 발생한 다발성 샘종 2예
강정민 ( Jeong Min Kang ),변정식 ( Jeong Sik Byeon ),박종하 ( Jong Ha Park ),안지용 ( Ji Yong Ahn ),고옥배 ( Ock Bae Ko ),명승재 ( Seung Jae Myung ),양석균 ( Suk Kyun Yang ),김진호 ( Jin Ho Kim ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.1
Familial adenomatous polyposis (FAP) is an inherited disease characterized by the development of hundreds of colorectal adenomas, leading to a 100% lifetime risk of colorectal cancer. A prophylactic colectomy is recommended for patients with FAP to prevent colorectal cancer. Four surgical strategies are available for patients with FAP: proctocolectomy with permanent ileostomy, colectomy with ileorectal anastomosis, proctocolectomy with Koch`s pouch continent ileostomy (Koch), and restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA). Koch and IPAA, which make ileal pouch, have theoretical advantage of the elimination of the risk of colorectal cancer and adenomas and good functional outcome of reduced defecation frequency. However, recent reports have shown frequent development of adenomas and carcinomas in the ileal pouch after Koch or IPAA. We experienced 2 cases of multiple pouch adenomas after pouch surgery in FAP patients. Both patients were treated with endoscopic mucosal resection without complications. We report these 2 cases with a review of literatures. (Korean J Gastroenterol 2010;56:49-53)