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.

Prevention of Protein Aggregation by Hsp104 via Protection of Oxidative Stress

이경희,조영환,염정훈,나선미,박정은,조인호,강종민,Lee, Gyeong Hui,Jo, Yeong Hwan,Yeom, Jeong Hun,Na, Seon Mi,Park, Jeong Eun,Jo, In Ho,Gang, Jong Min Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.11

Protection of Metal Stress in Saccharomyces cerevisiae: Cadmium Tolerance Requies the Presence if Two ATP-Binding Domains of Hsp 104 Protein

이경희,엄정훈,Lee, Gyeong Hui,Eom, Jeong Hun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.5

We have explored the importance of two ATP binding domains of Hsp104 protein in protection of yeast cells from cadmium exposure. In the previous study we have discovered that the presence of two ATP binding sites was essential in providing heat sh ock protection as well as rescuing cells from oxidative stress. In this paper we first report wild type cell with functional hsp104 gene is more resistant to cadmium stress than hsp104-deleted mutant cell, judging from decrease in survival rates as a result of cadmium exposure. In order to demonstrate functional role of two ATP binding sites in cadmium defense, we have transformed both wild type (SP1) and hyperactivated ras mutant (IR2.5) strains with several plasmids differing in the presence of ATP binding sites. When an extra copy of functional hsp104 gene with both ATP binding sites was overexpressed with GPD-promoter, cells showed increased survival rate against cadmium stress than mutants with ATP binding sites changed. The degree of protection in the presence of two ATP binding sites was similarly observed in ira2-deleted hyperactivated ras mutant, which was more sensitive to oxidative stress than wild type cell. We have concluded that the greater sensitivity to cadmium stress in the absence of two ATP binding sites is attributed to the higher concentration of reactive oxygen species (ROS) produced by cadmium exposure based on the fluorescence tests. These findings, taken all together, imply that the mechanism by which cadmium put forth toxic effects may be closely associated with the oxidative stress, which is regulated independently of the Ras-cAMP pathway. Our study provides a better understanding of cadmium defense itself and cross-talks between oxidative stress and metal stress, which can be applied to control human diseases due to similar toxic environments.

Some Properties of an RNA Ligase from Rhodosporidium toruloides

이경희,정연희,남정이,박인원,Lee, Kyung-Hee,Joung, Yean-Hee,NamShin, Jeong-E.,Park, In-Won Korean Society for Biochemistry and Molecular Biol 1987 한국생화학회지 Vol.20 No.2

Rhodosporidium toruloides의 무세포 추출물에서 새로운 RNA 연결효소의 활동성을 검출하였다. 이 효소계는 합성 UG의 5'-인산에 2'-, 3'-, 또는 고리형 2' : 3'-누클레오티드를 잇따라 결합시킴으로써 $N_nU_{16}G$(n= 1,2,3,...)을 합성시키는 것을 관찰하였다. 합성 올리고누클레오티드와의 연결반응은 2'-포스포모노에스테르, 3',5'-포스포디에스테르 중간체 결합의 형성에 의해서 진행한다. 이 RNA 연결효소는 그의 최대 활동성을 위해서 ATP와 $Mg^{2+}$을 필요로 한다. 흥미있는 것은, 무세포 추출물을 Micrococcus 에서 얻은 핵산가수분해효소로 처리하면 효소 활동성이 없어지지만, 데옥시리보 핵산가수분해효소로 처리한 경우에는 활동성에 영향을 미치지 않는다. 이것은 이 RNA 연결효소가 그의 연결작용에 RNA 성분을 필요로 함을 가리킨다. A novel RNA ligase activity has been detected in a cell-free extract from Rhodosporidium toruloides. The enzyme system was found to successively join 2'-, 3'-, or cyclic 2' : 3'-nucleotide to the 5'-phosphate of synthetic $U_{16}G$, leading to the synthesis of $N_{n}U_{16}G$(n=1,2,3...). The ligation of the nucleotides with synthetic oligonucleotide was found to proceed by forming 2'-phosphomonoester, 3',5'-phospho diester intermediate linkage. The RNA ligase requires ATP and $Mg^{2+}$ for its maximum activity. Interestingly, treatment of the cell- free extract with micrococcal nuclease but not with deoxyribonuclease abolishes the enzyme activity, indicating that the RNA ligase requires an RNA component(s) for its ligation activity.

새 정부의 주택 정책 방향에 대한 제언

이경희,Lee, Gyeong-Hui 한국주택협회 2008 주택과 사람들 Vol.214 No.-

주택 정책은 국민의 복지 수준과 서민 경제를 크게 좌우한다. 그래서 참여정부는 뜀박질하는 주택 가격을 잡기 위해 지난 5년간 부단히 애를 썼다. 국민들은 참여정부 시절 잘 된 부동산 정책은 그대로 실행하고, 그렇지 않은 제도는 수정.보완해서 주택 시장의 안정화에 기여하기를 바란다. 이번에 새로 출범한 새 정부의 주택 정책 방향에 대해 살펴보았다.

Sinus Pericranii in an Infant: MR Imaging and Angiographic Findings

이경희,김형진,Lee, Gyeong-Hui,Kim, Hyeong-Jin The Korean Radiological Society 2003 대한영상의학회지 Vol.49 No.5

두개변연 정맥혈관종은 비정상적인 정맥이 두개강 내외를 연결하는 드문 혈관질환이다.이 질환은 임상적으로도 진단이 가능하지만 방사선학적으로 두개강 내외를 연결하는 정맥을 나타내 줌으로서 다른 두피 종괴와의 감별에 도움을 줄 수 있다.수술로써 두개변연 정맥혈관종으로 확진되었던 환아에서 특징적인 자기공명영상과 혈관조영술의 소견을 보고하고자 한다. Sinus pericranii is a rare vascular anomaly involving abnormal communication between the intracranial and extracranial venous circulations. Although the condition can be diagnosed clinically, imaging is required to distinguish it from other entities and to identify the connection between the extracranial and intracranial dural venous sinus. We report the characteristic MR imaging and angiographic findings of a case of sinus pericranii

한국 청소년의 주관적인 체형 인식과 건강요인 및 구강건강요인과의 관련성 - 2015년 청소년건강행태온라인조사를 바탕으로 -

이경희,Lee, Kyeong-Hee 한국치위생학회 2017 한국치위생학회지 Vol.17 No.5

Objectives: The purpose of this study was to investigate the relationship between demographic characteristics, health factors, oral health factors and subjective body shape perception of adolescents in order to provide basic data for adolescents health management. Methods: This study was analyzed using Korea Youth Risk Behavior Web-Based Survey in 2015, where 68,043 adolescents in total participated. Data were analyzed by SPSS Ver. 21.0. Multiple regression analysis was used to analyze the relationships among health factors and oral health factors related to subjective body shape perception. Results: The analysis of the factors influencing the body shape perception of male adolescents showed that they tend to be low in school performance, low in family economic level, and high school students. The worse they perceive their subjective health to be, the more they feel stress, and the less frequently they brush their teeth per day. They had bad breath. The analysis of the factors influencing the body shape perception of female adolescents showed that they tend to be low in school performance, low in family economic level, and high school students. The worse they feel their subjective health is, the more they feel unhappy, and stressful, and the less frequently they brush their teeth per day. They feel pain during chewing, and have bad breath. Conclusions: In conclusion, it is necessary to consider educational intervention in adolescent life that will make them have proper perception of their body shape for proper health management of it. To make the intervention effective, we need to consider various factors such as health factors and oral health factors.

치과교정여부에 따른 치과협조도에 영향을 미치는 요인 연구

이경희,박한빛,용희연,이지희,최다인,현혜민,정은서,Lee, Kyeong-Hee,Park, Han-Bit,Yong, Hee-Yeon,Lee, Ji-Hee,Choi, Da-In,Hyeon, Hye-Min,Jung, Eun-Seo 한국치위생학회 2017 한국치위생학회지 Vol.17 No.4

Objectives: This study aims to investigate patient cooperation for dental treatments by dividing patients into two groups with different treatment categories, i.e. orthodontic patients versus non-orthodontic patients. Methods: On December 2016, the study conducted survey targeting 311 orthodontic or non-orthodontic patients who are 20 years old or older living in Seoul and Gyeonggi-do, South Korea. The study subject were informed with the adequate information of the study and signed consent forms. Except for the questionnaire copies from 23 respondents whose answers were insincere those from 288 respondents, equivalent to 92.6% of the data collected, were used in the present analysis. Results: This review intended to clarify any factors affecting patient cooperation for dental treatments shows that the perception of oral condition, the reliability of dentistry, and the patient preventive cooperation had an effect on patient cooperation for dental treatments. Conclusions: The results summarized above suggest orthodontic patients who are familiar with dental treatments by virtue of their regular visits to dental clinics have higher cooperation for dental treatments compared to non-orthodontic patients, and the higher reliability of dentistry leads to higher patient cooperation for dental treatments.

논문편 : 청소년의 스트레스와 대처에 관한 연구

이경희,김광응 ( Kyoung Hee Lee,Kwang Wung Kim ) 대한가정학회 1996 Human Ecology Research(HER) Vol.34 No.6