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Open IPTV 환경에서 재암호화 과정 없는 댁내 컨텐츠 분배를 위한 키관리 기법
정서현(Seo-Hyun Jung),노효선(Hyo-Sun Roh),이현우(Hyun-Woo Lee),이정현(Jeong-Hyun Yi),정수환(Sou-Hwan Jung) 한국컴퓨터정보학회 2010 韓國컴퓨터情報學會論文誌 Vol.15 No.7
최근 IPTV 환경이 점차 개방형 IPTV로 발전함에 따라, 댁내에서 사용되는 IPTV 단말의 경우도 다양한 형태로 발전하고 있다. 이러한 환경에서 사용자는 노트북, 휴대폰, PDA와 같은 댁내에 존재하는 다양한 IPTV 서비스 가용 단말을 통해 IPTV를 시청할 수 있게 된다. 하지만, 방송 콘텐츠보호를 위해 셋탑박스 (STB)에 탑재된 CAS 기술로 인해 같은 댁내에서도 각 단말의 개수만큼의 STB를 필요로 하거나, STB에 연결가능한 모든 단말에는 CAS가 해제된 상태로 무제한 제공하여야 하는 것이 현재의 기술 수준이다. 본 논문에서는 추가적인 STB 설치 없이 댁내 사용자가 선택한 IPTV 가용 단말들로 컨텐츠를 재분배함과 동시에 서비스 사업자가 복수의 사용자 단말에 대하여 수신제어가 가능한 기술을 제안한다. 제안 기법은 RSA 서명의 개인키 분할 방식을 사용하여 STB에서 댁내 IPTV 단말로 전달되는 컨텐츠를 기존 CAS 시스템을 통해 스크램블링된 내용 그대로 재암호화과정 없이 전달할 수 있다. 따라서, 제안기법은 STB에서 사용자 단말 구간에 재암호화 기법을 활용하여 콘텐츠를 분배하는 기존 기법에 대비하여, 기존의 보안 수준을 유지하면서도 계산량 및 전송량 측면에서 기존 기술과 비교하여 많은 성능개선과 함께, 댁내에 재분배되는 컨텐츠에 대한 불법적인 유출을 방지하는 효과도 부수적으로 제공한다. Due to the advancement of IPTV technologies, open IPTV services are a step closer to becoming reality. In such service environment, users are able to enjoy IPTV services using a variety of devices available at their home domain. However, it is impossible to get such flexible services at their convenience unless each of devices is individually connected to Set-Top-Box (STB) because of Conditional Access System (CAS) or service providers otherwise allow STB to freely distribute decoded contents to every user devices attached to STB. In this paper, we propose a key management scheme for securely distributing contents from STB to multiple user devices at home domain. The proposed scheme also makes the service providers be able to control the access rights to each of user devices without installing individual STBs. It is achieved by computationally dividing a private key of RSA signature scheme into three parts and thus makes possible to distribute the contents scrambled through a underlying CAS mechanism without re-encrypting them that the existing scheme should employ. It improves significantly computation and communication complexities, maintaining it as secure as the existing schemes. Additionally, it prevents misbehaving users from illegally distributing the contents from STB to their devices available at home domain.
정서인(Jung, Seo-In),이수진(Lee, Su-Jin) 한국주거학회 2019 한국주거학회 학술대회논문집 Vol.31 No.2
According to the data of ‘2018 Population and Housing Census’ by Statistics Korea, 50.1% of Korean households that refer to more than half of the whole population are living in apartments. Residents of ‘apartment’ which is a representative type of housing in Korea are making great demands for apartment environments where can restore relationships with neighbors and are good to live and their interest in community spaces is highly growing too. However, community facilities in Korean apartment housing complexes are mostly less used for their original purposes and many of them are neglected as vacant spaces. Especially, community facilities that never take characteristics of residents into accounts are closed and are not used properly in many cases because of the oversized spaces. Accordingly, this study is focused on analyzing the present state and characteristics of community spaces in an overseas apartment complex with community spaces where are properly supervised and managed. Furthermore, this study aims to seek measures for revitalizing community spaces of apartment complexes in Korea.
매복된 상악 견치에 의한 전치의 치근 흡수에 대한 후향적 연구
정서현,송지수,신터전,현홍근,김영재,김정욱,이상훈,장기택,Jung, Seo-Hyun,Song, Ji-Soo,Shin, Teo Jeon,Hyun, Hong-Keun,Kim, Young-Jae,Kim, Jung-Wook,Lee, Sang-Hoon,Jang, Ki-Taeg 대한소아치과학회 2018 大韓小兒齒科學會誌 Vol.45 No.2
Root resorption of the permanent maxillary incisors can occur due to ectopic eruption of the permanent canines. Severe root resorption threatens the long-term survival of the affected incisors. The aim of the present study was to identify risk factors for root resorption of the maxillary incisors associated with impacted maxillary canines. In the present study, we retrospectively analyzed the Cone-Beam Computed Tomography (CBCT) scans of 65 children and adolescents with ectopically erupting maxillary canines (total of 88 impacted canines). Root resorption of central incisors was significantly associated with the mesiodistal position and root development of the adjacent canine. Root resorption of lateral incisors was significantly associated with sex, age, and the buccolingual and vertical position of the adjacent canine. However, enlargement of the dental follicle was not significantly associated with root resorption of adjacent incisors. Although incisor resorption is difficult to diagnose and predict, our findings suggest that changes in the dental follicles of the erupting maxillary canines do not cause resorption of the adjacent permanent incisors. CBCT should be utilized to ensure early diagnosis of impacted canines and precise evaluation of incisor root resorption. 상악 견치가 매복 시에 종종 인접 전치 치근의 치근흡수가 나타난다. 심각한 전치의 치근 흡수는 치아의 장기적인 예후를 불량하게 하기도 한다. 이 연구의 목적은 3차원 영상을 이용하여 상악 견치에 의한 전치의 치근 흡수를 관찰하고 관련된 요인을 분석하는 것이다. 연구 대상자는 상악 견치 매복을 가진 65명의 어린이로 총 88개의 치아에 대해 65개의 cone-beam computed tomography 영상을 분석하였다. 그 결과, 상악 견치의 치근 발달 정도와 치근단공의 폐쇄 및 치관의 근원심적인 위치가 중절치의 치근흡수와 유의한 관계를 나타내였다. 측절치의 치근 흡수 여부는 환아의 성별, 나이, 상악 견치의 협설 위치, 수직적 위치에 영향을 받았다. 상악 견치 치배의 확장은 중절치와 측절치의 치근 흡수 여부와 유의한 관계가 없어, 치배의 확장이 치근 흡수에 직접적인 역할을 하지 않는 것으로 나타났다. 상악 견치의 매복 시에 전치의 치근 흡수는 예측하기 어렵기 때문에, 3차원 영상을 이용한 조기 진단이 필요하다.
일본 UR임대주택단지의 커뮤니티활성화 지원실태에 관한 고찰
이수진(Lee, Su-Jin),정서인(Jung, Seo-In) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.1
This study aims to offer a directivity of community support, which is suitable for domestic circumstances by analyzing the community support method and the performance of the UR housing S that is a Japanese UR rental housing complex. In the UR housing S, even the residents, who did not join the residents’ association made an exchange with each other, as events and exchange events continued, and there was a change in the sense of community, including improvement in identity. It is considered that taking the case of the UR housing S for their model, domestic apartment housing need to search detailed and differentiated community development methods fit for regional circumstances to increase participation of residents and maintain consistently.
연구논문 : 고추장 묘사분석을 위한 프로토콜 개발: 입가심물질 중심으로
이은혜 ( Eun Hye Lee ),정서전 ( Seo Jin Chung ),유선미 ( Seon Mi Yu ),한귀정 ( Gwi Jung Han ) 한국식품조리과학회(구 한국조리과학회) 2013 한국식품조리과학회지 Vol.29 No.5
This study was conducted to establish an effective palate cleanser when conducting descriptive analysis for gochujang products. In addition, descriptive analysis procedure for gochujang products was optimized. A generic descriptive analysis was performed on 4 types of gochujang samples varying in hot and spicy levels. The sensory attributes developed were 9 odors, 13 flavors, 4 texture and mouth feel attributes, and 4 appearance attributes. In order to select an effective palate cleanser for gochujang, 5 types of cleansers were tested (water,water+bread, water+cucumber, water+milk, water+cracker). Correct answering rate, significant numbers of product effect on sensory attributes, and the mean hot and spicy intensity values were considered to select the optimal palate cleanser. Results showed that as the hot & spicy level increased, red pepper odor and flavor significantly increased whereas umami taste intensity decreased. When comparing the efficiencies of various palate cleanser, the correct answer rates were the highest when warm water was used with either cucumber or cracker. Additionally, the attribute intensities were better differentiated between gochujang samples when cracker, white wheat bread, or cucumber were used. Overall, warm water with cucumber or cracker were shown to be the most effective cleansers.
이정서(Jung-Seo Lee),김영환(Young-Hwan, Kim) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.9
The purpose of this study is to investigate the relationship between resilience, burnout, and self-efficacy of Public Social Workers and to draw implications for effective management of Public Social Workers. In order to accomplish this study purpose, the resilience of Public Social Workers as an independent variable, burnout as a dependent variable of occupational identity, and self-efficacy as a moderating variable were selected. The causal relationship between resilience and burnout and the moderating effect of self-efficacy were analyzed. As a result of the analysis, the resilience of Public Social Workers showed a significant effect on burnout, and the effect of resilience on burnout varied according to self–efficacy, so there was a moderating effect of self-efficacy. Based on the results of this analysis, the theoretical implications and policy implications of this study are suggested.