Matchmaker : Fuzzy Vault Scheme for Weighted Preference

Tuvshinkhuu Purevsuren(툽신후),Jeonil Kang(강전일),DaeHun Nyang(양대헌),KyungHee Lee(이경희) 한국정보보호학회 2016 정보보호학회논문지 Vol.26 No.2

Juels와 Sudan의 퍼지 볼트 기법은 기법이 갖는 오류 내성 때문에 많은 연구에 사용 되어오고 있다. 그러나 이들의 퍼지 볼트 기법은 그들의 논문에서 영화 애호가 문제를 예를 들었음에도 불구하고, 사람들이 일반적으로 갖는 선호도(preference)의 차이에 대한 고려가 존재하지 않는다. 한편, Nyang과 Lee는 안전하고 성능이 좋은 얼굴인증 시스템을 만들기 위해서, 얼굴 특징이 서로 다른 가중치를 갖도록 얼굴 특징과 퍼지 볼트(vault) 사이에 특별한 연관 구조를 갖는 얼굴 인증 시스템(이른바, 퍼지 얼굴 볼트)을 소개하였다. 그러나 그들의 기법은 일반적인 특징 추출 기법들이 클래스 내부/간 차이를 최적화하려는 특성이 있기 때문에 인증 실패율을 성공적으로 낮추지 못할 것으로 쉽게 예상할 수 있다. 이 논문에서는 퍼지 볼트의 유연성을 제공해주기 위하여 Nyang과 Lee의 퍼지 볼트기반의 얼굴 인증 시스템에서 가중치 아이디어를 다른 방식으로 구현한 버킷(bucket) 구조와 사용자 선호도와 시스템 구현 간 관계를 공식화하는 세 가지 분포 함수에 대해서 소개한다. 또한 이를 바탕으로 선호도 매치메이커(preference matchmaker) 기법을 제안하며, 영화 데이터베이스를 이용하여 이러한 매치메이커의 연산 성능을 확인해본다. Juels and Sudan’s fuzzy vault scheme has been applied to various researches due to its error-tolerance property. However, the fuzzy vault scheme does not consider the difference between people’s preferences, even though the authors instantiated movie lover’ case in their paper. On the other hand, to make secure and high performance face authentication system, Nyang and Lee introduced a face authentication system, so-called fuzzy face vault, that has a specially designed association structure between face features and ordinary fuzzy vault in order to let each face feature have different weight. However, because of optimizing intra/inter class difference of underlying feature extraction methods, we can easily expect that the face authentication system does not successfully decrease the face authentication failure. In this paper, for ensuring the flexible use of the fuzzy vault scheme, we introduce the bucket structure, which differently implements the weighting idea of Nyang and Lee’s face authentication system, and three distribution functions, which formalize the relation between user’s weight of preferences and system implementation. In addition, we suggest a matchmaker scheme based on them and confirm its computational performance through the movie database.

최근 제안된 두 그룹서명기법의 암호분석

하등과(DengKe Ha),김기태(KiTae Kim),양대헌(DaeHun Nyang),이경희(KyungHee Lee) 한국정보보호학회 2010 정보보호학회논문지 Vol.20 No.5

연결불가능성(unlinkability)과 추적불가능성(traceability)은 그룹서명이 만족해야 하는 기본적인 요구사항이다. 본 논문에서 최근 Lee등과 Zhu등에 의해서 제안된 두 그룹 서명기법들이 갖는 취약점을 분석하였다. Lee등의 기법은 합법적인 서명자가 생성한 서명을 검증할 수 없는 설계상의 치명적인 문제를 갖고 있으며, 검증과정이 안고 있는 문제와 별개로 동일한 서명자가 생성한 서명을 항상 링크할 수 있음을 보인다. 또, Zhu등의 그룹서명기법에서 그룹의 관리자가 추적할 수 없도록 서명을 생성하는 것이 가능함을 보이고, 저자들의 주장과 달리, 그들의 기법이 전방향 안전성을 만족하지 않음을 보인다. Unlinkability and traceability are basic security requirements of a group signature scheme. In this paper, we analyze two recent group signature schemes, Lee et al.'s scheme and Zhu et al.'s scheme. We show that Lee et al.’s scheme does not work correctly. Further, it fails to meet unlinkability, that is, anyone who intercepts or receives group signatures are able to check if they are from the same signer. We also show that Zhu et al.'s scheme is unable to satisfy traceability, that is, a malicious group member can generate valid group signatures that cannot be opened. Moreover, once becoming group member, the malicious group member will never be revoked from group. Besides, Zhu et al.'s scheme fails to satisfy forward security, a requirement claimed by authors.

뜬 구름 잡기가 될지도 모를 나의 꿈

이경희,Lee, Gyeong-Hui 한국도서관협회 2006 圖協會報 Vol.47 No.4

꿈꿀 권리를 누리는 곳, 정독도서관 - 지역주민과의 만남, 소통, 어울림이 있는 독서.문화예술프로그램 -

이경희,Lee, Gyeong-Hui 한국도서관협회 2010 圖協會報 Vol.51 No.10

학습환경으로서 미래교육시설구성에 대한 교사 인식 연구

이경희,홍경선,유화영,Lee, Gyeoung-Hee,Hong, Kyung-Sun,Yu, Hwa-Young 한국교육시설학회 2012 敎育施設 Vol.19 No.4

The purpose of this study is to gauge the level of awareness of elementary, middle school, and highschool teachers regarding teaching-learning activities, learning space, and support for technology-based instruction in current and future school education, thereby providing essential data for seeking future improvements in the learning environment. Towards this end, a survey questionnaire (sectionalized into teaching-learning activities, learning space, and support for technology-based instruction) was developed. Subsequently the survey was administered to a random sampling of elementary, middle school, and highschool teachers in the Kyonggi, Kangwon, and Chonra Provinces. An in-depth analysis was conducted on the 797 questionnaire responses thus attained, focusing on the teachers' level of awareness regarding teaching-learning activities, learning space, and support for technology-based instruction, the correlation of the findings of the three areas in question, and the differences of the findings according to the circumstances of those surveyed. Based on the results, the authors of this study propose the following: First, that school administrators take into account the level of awareness of frontline teachers regarding teaching-learning activities, learning space, support for technology-based instruction. Second, efforts should be made to establish a safe and secure learning environment conducive to the synergic interplay of the three areas in question, by realizing true ICT in the classroom. Third, teachers in the classroom must endeavor to achieve a meaningful synthesis between educational programs and teaching-learning activities, as well as to serve as harbingers of improvements in the way we conduct the business of education.

기상청 태풍예보의 현재와 국가태풍센터의 역할

이경희,차은정,Lee. Gyeong-Hui,Cha. Eun-Jeong 한국방재학회 2007 한국방재학회지 Vol.7 No.2

0.1% 클로르헥시딘과 탄툼액을 이용한 구강간호가 기관내관을 삽입한 중환자실 환자의 구강상태 및 구강내 세균 발생에 미치는 효과

이경희,박해경,김지혜,Lee, Kyung-Hee,Park, Hae-Kyung,Kim, Ji-Hye 한국중환자간호학회 2010 중환자간호학회지 Vol.3 No.2

Purpose: The purpose of this pilot study was to investigate the effect of oral care using 0.1% chlorhexidine and tantum solution on oral status and incidence of oral pathogens among intubated ICU patients. Methods: The study subjects were 26 intubated patients of MICU in a university hospital. Oral care was provided with 0.1% chlorhexidine solution to the experimental group (n=12) and with tantum solution to the control group (n=14), 3 times a day for 6 days. After the intervention, the oral status of each subject was checked using structured method, and oral swab culture was done to count colonized bacterial pathogens. Results: The mean oral status score of experimental group was significantly higher than that of control group (U=42.50, p=.031). The mean incidence of oral pathogens in experimental group was smaller than that of control group, but the difference was not statistically significant. Conclusion: The oral care with 0.1% chlorhexidine solution is more effective than with tantum solution for improving oral status of intubated ICU patients. However, additional studies with larger sample size will be needed to figure out it's effects on the incidence of oral pathogens.

IPTV2.0 서비스를 위한 네트워킹 기술

이경희,윤장우,류원,김봉태,Lee, Kyounghee,Yoon, Changwoo,Ryu, Won,Kim, Bongtae 대한임베디드공학회 2008 대한임베디드공학회논문지 Vol.3 No.4

The convergence of broadcasting and telecommunication services is being accelerated by broadband networks, digital broadcasting and Web2.0. This paper describes the definition and service characteristics of IPTV as a representative of broadcasting and telecommunication convergence services. Especially, the changes of infrastructure and technology for IPTV2.0 are addressed in terms of the service features of mobility, intelligence and participation. IPTV2.0 shall be characterized by the open IPTV service based on Web2.0 and the mobile IPTV service over the heterogeneous networks employing various wireless/wired access technologies. The IP Multimedia Subsystem (IMS) and Service Delivery Platform (SDP) technologies are increasingly considered to support the personalization and openness. The mobility management technology is being evolved to provide QoS-guaranteed mobile communication services to users at anytime and anywhere. IPTV2.0 services and platforms are also anticipated to be core components to achieve knowledge-based ubiquitous society. IPTV2.0 contents are required to be integrated with the enhanced metadata to efficiently support search, selection, convergence and delivery of the contents. Moreover, those contents shall be enhanced to provide the scalable services which is adaptable to the network status and user preferences. Therefore, the networking technologies for IPTV2.0 should tightly cooperate with application services and adaptive contents. Those technologies will be developed to construct the ubiquitous content service platform considering the evolution of networks and various converged services.

부정교합이 취업에 미치는 영향에 관한 인식

이경희,김민지,김소라,나미영,엄혜정,이소의,한정아,정은서,Lee, Kyeong-Hee,Kim, Min-Ji,Kim, So-Ra,Na, Mi-Young,Eum, Hae-Jung,Lee, So-Ui,Han, Jung-Ah,Jung, Eun-Seo 한국치위생학회 2017 한국치위생학회지 Vol.17 No.4

Objectives: This study investigated the perception on the effects of malocclusion on employment, and aimed to provide information to those who are seeking employment. Methods: The study examined 306 subjects aged 19 to 39 in Seoul and Gyeonggi-do during the month of December, 2016. The data obtained were analyzed using frequency analysis, t-test, one-way ANOVA, chi-square test and multiple regression analysis among others. Results: The most important factors in job success were education (35.9%), followed by appearance (23.8%), and major (22.1%). On whether there is a correlation between social life and malocclusion, 49.0% and 51.0% of the subjects answered 'Yes' and 'No', respectively. When the factors influencing the perception of the effects of malocclusion on employment were reviewed, it was found that for female(p<0.01) subjects, the perceived effect of malocclusion on life and on employment (p<.001), and the perceived effect of malocclusion on employment were lower in 20-24 year olds and 25-29 year - olds (p<0.01). Conclusions: Many people believe that malocclusion affects employment and that it is necessary to provide information on orthodontic treatment to those who are preparing for employment and ordinary. However, it is important to provide correct information about orthodontic treatments, including functional improvement, rather than simply focusing too much on aesthetic effects alone.

ROBOTC기반 LEGO MINDSTORMS NXT 로봇을 이용한 교육과정 개발 및 교육효과 분석

이경희,Lee, Kyung-Hee 한국정보처리학회 2011 정보처리학회논문지 A Vol.18 No.5

본 논문에서는 대학생 대상의 ROBOTC 기반 레고 마인드스톰 NXT 로봇을 이용한 교육과정 개발 내용을 보이고, 이 과정에 대한 교육효과를 분석하였다. 교육과정은 로봇의 기본 이해와 실습, 응용로봇 실습, 창의로봇 설계 및 구현으로 구성하였다. 2009년부터 3년간 교육을 진행하는 동안, 6개 분반 총 94명의 수강생을 대상으로 설문조사를 실시하여 교육효과를 분석하였다. 분석 결과를 통해 레고 마인드스톰 NXT 로봇을 이용한 교육과정이 학습동기와 학습의욕을 불러 일으켰고, 학생들의 교과목 교육목표 및 학습성과 달성도가 우수하였음을 보인다. 또한 학생들의 수업 및 과제물 수행에 대한 참여도가 매우 높았으며, 문제해결능력과 창의력 향상에 도움을 주었고, 조별 프로젝트 수행으로 협동심도 향상되었다. 마지막으로 ROBOTC기반 프로그래밍에 의한 로봇 제어 실습으로 C언어 프로그래밍 능력 향상에도 도움을 준 것으로 나타났다. In this paper, we show how a curriculum using LEGO MINDSTORMS NXT robot based ROBOTC for undergraduate students has been developed, and we analyze the educational effect of the curriculum. The curriculum is composed of basic knowledge learning, practice with basic robots, practice with advanced robots, and creative design and implementation of robots. During the three year period since 2009, educational achievement has been analyzed by surveys for 6 classes, 94 students. According to the analysis, the curriculum has highly motivated the students and made them to achieve effectively our educational and academic goals. Also, we observe that the curriculum helped the students to improve their creativity and the problem solving skill, and that the students were autonomously and deeply involved in the homework and the term projects, which made them be very cooperative. Finally, the intensive practice with ROBOTC programming is shown to help students to improve their programming ability of C language.