개방형 IPTV 환경에서의 사용자 인증 및 키 분배 메커니즘

정지연,도인실,채기준,Jung, Ji-Yeon,Doh, In-Shil,Chae, Ki-Joon 한국정보처리학회 2011 정보처리학회논문지 C : 정보통신,정보보안 Vol.18 No.4

IPTV는 대표적인 방송통신융합 산업으로 IP망의 양방향성을 이용한 서비스의 차별화를 내세우며 여러 사업자에 의해 서비스가 이루어지고 있다. 최근에는 모바일 환경 등으로 그 영역을 확대하기 위한 연구가 진행되고 있으며 다른 한편으로는 IPTV 서비스를 위한 플랫폼 등을 개방하여 사업자가 아닌 일반인도 IPTV를 통한 방송을 할 수 있는 구조인 개방형 IPTV에 대한 연구가 활발하다. 이러한 개방형 IPTV 환경에서는 다수의 콘텐츠 제공자가 존재하기 때문에 기존 IPTV에서 사용되는 특정 기기 혹은 스마트카드를 통한 사용자 인증 및 키 분배가 어려운 실정이다. 본 논문에서는 기존 분산 네트워크에서의 인증 메커니즘인 Kerberos를 기반으로 하여 분산 환경에서 안전한 사용자 인증과 키 분배를 위한 메커니즘을 제안하였다. 제안 메커니즘은 콘텐츠의 안전한 전송을 보장하며 기존 제안된 IPTV 사용자 인증 관련 연구보다 인증 시간 오버 헤드에 있어 우위에 있음을 시뮬레이션을 통해 증명하였고 다양한 관점에서 제안 메커니즘을 다른 관련 연구와 비교하여 개방형 IPTV 환경에서 제안 메커니즘이 갖는 효율성을 증명하였으며 IPTV가 갖는 보안 요구 사항을 제안 메커니즘이 만족한다는 것을 보였다. IPTV(Internet Protocol Television) is one of the typical businesses which are the convergence of Broadcast and Communication. It provides broadcasting service using IP networks. Recently, IPTV service is developed to Mobile IPTV or Open IPTV. Especially, Open IPTV uses open platform so not only service providers but also general users can provide contents to other users. Open IPTV system has many content providers, so existing security solution of IPTV cannot be adopted. In this paper, we suggest user authentication and key distribution mechanism on Open IPTV. Our proposed mechanism is based on Kerberos, so it can support distribution environment such as Open IPTV. We demonstrate that proposed mechanism can guarantee secure transmission of contents and reduce the delay of user authentication on Open IPTV system compared to other authentication mechanisms. We also compare our proposal and other mechanisms in various aspects, and analyze efficiency and safety of proposed mechanism. As a result, we insist that this mechanism satisfies the security requirements for IPTV.

일반인의 심폐소생술 인식에 따른 교육 활성화 방안 - 전북지역을 중심으로 -

정지연,심정신,신상열,Jung, Ji-Yeon,Shin, Chung-Sin,Sin, Sang-Yol 한국응급구조학회 2007 한국응급구조학회지 Vol.11 No.3

This study was attempted to provide basic data develop CPR training program for layperson by looking into layperson's recognition and attitude of execution of CPR and to prepare for underlying data in drawing up training policy and suggesting relevant legislation so that trained laypersons can positively perform rescue activities. The survey was done from August 20 to September 20, 2007. Total Subjects in this study were 78. The collected data were analyzed by SPSS Program. The summary of the research is as follows : First, to the question of whether or not the recognition or performance of CPR is universal within the country, 82.1% of respondents gave a negative answer as 'No', The most reason was found to be 'Poor training and P.R. of CPR' accounting for 50.1%, 94.8% of the whole respondents answered that CPR training is necessary. As plan for activatin of CPR training, they answered that top priority shall be given to compulsory school training(79.5%). Secondly, when respondents observed their family's cardic 84.6% of them answered that they would conduct CPR but when they observed other's cardiac arrest, just 41.7% of them answered it. As an effective CPR activation plan, the most answer was training and P.R. of CPR as 79.5%. This study suggests that laypersons high perception of the effectiveness of the CPR and that they wound be willing to provide CPR in a medical emergency.

한국인의 대장암 세포주에서 p53 돌연변이의 발견과 발현에 관한 연구

정지연,오상진,Jung, Ji-Yeon,Oh, Sang-Jin 대한면역학회 2001 Immune Network Vol.1 No.2

Background: Inactivation in p53 tumor suppressor gene through a point mutation and deletion is one of the most frequent genetic changes found in human cancer, with 50% of an incidence. This high rate of mutation mostly suggests that the gene plays a central role in the development of cancer and the mutations detected so far were found in exons 5 to 8. Mutation of p53 locus produced accumulation of abnormal p53 protein, and negative regulation of cell proliferation and transcriptional activation as a suppressor of transformation were lost. In addition, inhibition of its normal cellular function of wild-type by mutant is an important step in tumorigenesis. Method: 4 colon cancer cell lines (SNU C1, C2A, C4, C5) were examined for mutation in exons 5 to 8 of the p53 tumor suppressor gene by PCR-SSCP analysis and expression pattern by western blotting and immunoprecipitation. p53-mediated transactivation ability were examined by CAT assay and base substitution of p53 in SNU C2A cell were detected by DNA sequencing. Results: 1) SNU C2A cell and SNU C5 cell were detected mobility shifts each in exon 5 and exon 7 of p53 gene by the PCR-SSCP method, implicating being of p53 mutation. 2) 3 colon cancer cell lines (SNU C1, SNU C2A, SNU C5) expressed wild type and mutant type p53 protein. 3) In northern blot experiment, SNU C2A and SNU C5 cell expressed high level of p53 mRNA. 4) Results of p53-mediated transactivation in colon cancer cell lines by CAT assay represented only SNU C2A cell has transcriptional activity. 5) DNA sequencing in SNU C2A cell showed missense mutation in codon 179 of one allele, histidine to arginine and wild type p53 in the other allele. Conclusion: Colon cancer cell lines showed correlation with mutation in p53 gene and accumulation of abnormal p53 protein. Colon cancer cell SNU C2A retained p53-mediated transactivation as heterozygous p53 with one mutant allele in 179 codon and the other wild-type allele.

새만금 방조제 외해역의 저서생물 군집 변화

정지연,권효근,장정렬,최강원,Jung, Ji-Yeon,Kwon, Hyo-Keun,Jang, Jeong-Ryeol,Choi, Kang-Won 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2

This study was carried out to investigate the changing of benthic macrobenthos community in Saemangeum subtidal area. The distribution of macrobenthic community is important to assume the benthic environment in study area. Macrobenthic community was investigated three times in 2007 (March, June and September) in the Saemangeum subtidal area. The mean density of macrobenthos was $345{\sim}838ind./m^2$ and the most dominant taxa was benthic polychaete. Opportunistic species such as E.cordatum, T.fragilis, H.filiformis, and Tharyx sp. were shown high appearance rate in study area. The dominance of these opportunistic species suggest that the benthic environment of study area was unstable due to environmental disturbance. But, there are only few point that these species were recorded high densities, and also equilibrium species was dominant, too. It means disturbance and un stability of benthic environment in Seamangeum was not serious yet. so the dynamics and trends of these opportunistic species should be concerned.

토끼에서 Pasteurella multocida 감염에 의한 뇌막뇌염과 폐렴 증례보고

정지연,이경현,최은진,김하영,손준형,소병재,정지열,Jeong, Jiyeon,Lee, Kyunghyun,Choi, Eun-Jin,Kim, Ha-Young,Sohn, Jun Hyung,So, ByungJae,Jung, Ji-Youl 대한수의학회 2018 大韓獸醫學會誌 Vol.58 No.1

Eight rabbits exhibited head tilt and subsequently died. At necropsy, three rabbits had crusty deposits in ears and four had reddish lungs. The main histopathological features were severe diffuse suppurative meningoencephalitis (75.0% of rabbits), fibrinopurulent pneumonia (37.5%), and otitis externa (37.5%). Pasteurella multocida (P. multocida) was isolated from brains, ears, and lungs. The capsular serogroups of the isolates were untypable. Based on histopathological features and bacterial analysis results, the rabbits were diagnosed as P. multocida infection. P. multocida infections might result in considerable economic loss in commercial rabbit production facilities in Korea.

응급구조학과 학생들의 재난대처핵심역량과 재난대처방법에 대한 인식

정지연,Jung, Ji-Yeon 한국응급구조학회 2018 한국응급구조학회지 Vol.22 No.2

Purpose: To investigate the perception of paramedic students about core competence and methods of disaster response. Methods: A self-reported questionnaire was completed by 210 paramedic students in Jeollado from March 2 to April 2, 2018. It comprised 57 questions on topics such as general characteristics (6), related experience (11), cognition of core competence (15), and knowledge of disaster response methods (25). Data were analyzed by means of a frequency analysis, a t-test, an ANOVA, and the Pearson's correlation coefficient using SPSS WIN 21.0. Results: The average score of the participants on disaster response core competence was 3.21. The statement "In case of a disaster, I know the duties of medical staff" scored the second highest, at 3.58, and "In the case of disaster, I can conduct the basic treatment" scored the highest ar 3.59. The average score for the disaster response methods was 3.31. Within the section, the statement "I know what I need to do in the case of burn patients" scored 3.59 and "I know what I need to do in the case of a cardiac arrest patient" scored the highest at 3.93. Conclusion: It is necessary to develop a training module considering the diverse types of disasters and a standardized education program for simulation similar to real-life situations.

논문 - HSPF를 이용한 새만금 유역의 오염부하 특성

정지연,신유리,최정훈,최인규,윤춘경,손영권,Jung, Ji-Yeon,Shin, Yu-Ri,Choi, Jung-Hoon,Choi, In-Kyu,Yoon, Chun-Gyeong,Son, Yeong-Kwon 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.2

This study was performed to analyze the influence of pollutant loads characteristics on the point and non-point sources in Saemangeum watershed area using Hydrological Simulation Program, Fortran (HSPF). The simulation items were flow, BOD, T-N, and T-P(2007~2010). The pollutant loads trend reflects the precipitation. Specifically, the point source loads were almost constant, but the non-point source loads were influenced in the precipitation. It was found that the effect of non-point source is larger than point source. The water quality had a clear trend by the season. However, pollutant loads did not show distinct seasonal changes. The reason is that the pollutant concentration is diluted by the increased flow at summer season. Therefore, it is important to control the non-point source in order to manage water quality in the region. For the management of Saemangeum lake, it is need to control of supplied pollutant loads from Saemangeum watershed.

TV 뉴스 앵커의 의상색 이미지에 관한 연구

정지연(Ji-yeon Jung),이은경(Eun-kyung Lee) 한국생활과학회 2009 한국생활과학회 학술대회 Vol.2009 No.하계

공유 주거, 삶의 공동체

정지연(Jung, Ji-Youn) 대한건축학회 2019 建築 Vol.63 No.8

광원에 따른 벨벳과 플란넬 직물의 색변화 비교

정지연(Ji-yeon Jung),이은경(Eun-kyung Lee) 한국생활과학회 2008 한국생활과학회 학술대회 Vol.2008 No.동계