• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2004년도 춘계 학술발표대회 논문집
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• pp.304-305
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• 2004

• Journal of Communications and Networks
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• 제16권3호
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• pp.258-263
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• 2014

A hierarchical identity-based broadcast encryption (H-IBBE) scheme is an identity-based broadcast encryption (IBBE) scheme in a hierarchical environment. In order to obtain secure H-IBBE schemes in the quantum era, we propose an H-IBBE scheme based on the learning with errors problemassumption.Our scheme achieves indistinguishability from random under adaptive chosen-plaintext and chosen-identity attacks in the random oracle model.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2007년도 가을 학술발표논문집 Vol.34 No.2 (D)
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• pp.151-154
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• 2007

최근 인터넷 상의 개인정보의 유출로 인한 피해가 급증하면서, 인터넷 상에서 사용하는 사용자 정보 관리 문제가 크게 대두되고 있다. 이들을 해결하기 위하여 여러 Identity 관리 시스템이 등장했다. 이들 중 OpenID는 사용자 중심의 Identity 관리 기술이며, url을 기반으로 하는 사용자 정보 제공 시스템이다. 기존의 웹 서비스는 입력된 사용자의 정보를 각각 저장하여 관리하는 반면, OpenID는 OpenID를 지원하는 특정 사이트를 지정함으로써 그곳에서 사용자의 정보를 제공하는 것이 특징이다. 하지만 이런 분산화된 사용자의 정보는 웹서비스에서 필요하는 사용자에 정보에 따라 각각 다른 url를 입력해야 한다. 이와 같은 방법은 기존의 각 사이트마다의 아이디와 패스워드를 알아야 하는 것과 같은 현상을 초래할 수 있다. 본 논문을 통해 구현한 서비스는 웹 서비스에서 요구하는 사용자의 정보에 따라 동적으로 사용자 정보제공자를 선택하거나 필요한 정보만을 요청함으로써 하나의 url만으로 원하는 모든 웹 서비스를 이용할 수 있도록 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권12호
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• pp.6175-6189
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• 2019

To slove the security and efficiency problem of anonymous authentication in vehicular ad-hoc network (VANET), we adopt the bilinear pairing theory to propose an identity-based batch anonymous authentication scheme for VANET. The tamper-proof device in the on-board unit and the trusted authority jointly realize the anonymity of vehicle identity and the signature of messages, which further enhances the security of this scheme, as well as reduces the overhead of trusted authority. Batch authentication can improve the efficiency of anonymous authentication for VANET. Security and efficiency analyses demonstrate that this scheme not only satisfies such security properties as anonymity, non-forgeability and non-repudiation, but also has advantage in time and space complexity. Simulation results show that this scheme can achieve good performance in real-time VANET communication.

• 여성건강간호학회지
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• 제26권1호
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• pp.84-92
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• 2020

Purpose: The objective of this study was to identify the factors influencing maternal identity in pregnant women. Methods: Using a descriptive research design, a cross-sectional survey was conducted. In total, 127 pregnant women were recruited from a tertiary hospital in Korea from January to April 2019. Measurements included maternal identity, stress, depression, spousal and familial support, and demographic and obstetric characteristics. Data were analyzed by descriptive statistics, the independent t-test, one-way ANOVA, Pearson correlation coefficients, and stepwise multiple regression using SPSS version 25.0. Results: The mean score for maternal identity was 131.15 out of 160, and the mean scores for stress, depression, and spousal and familial support were 14.59 (out of 40), 6.82 (out of 30), and 109.04 (out of 132), respectively. Stress (r=-.38, p<.001), depression (r=-.37, p<.001), and spousal and familial support (r=.37, p<.001) were significantly correlated with maternal identity. In multiple regression analysis, stress (β=-0.27, p=.005) and spousal and familial support (β=0.23, p=.014) were found to be significant factors influencing maternal identity in pregnant women (F=14.19, p<.001). Conclusion: It is necessary to develop effective strategies to mitigate stress and to encourage spousal and familial support in pregnant women. Such strategies could further enable pregnant women to enhance their maternal identity.

• 여성건강간호학회지
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• 제15권4호
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• pp.320-327
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• 2009

Purpose: The purpose of this study was to investigate the degree of the gender role identity and quality of life of women applying hormone replacement therapy with hysterectomy and to identify the relation among these variables. Methods: The subjects were 121 outpatients applying hormone replacement therapy with hysterectomy at a university hospital in Busan province. The data were collected using self-reported questionnaire and medical record, from September to October 2008. Results: There were statistically significant differences in the degree of quality of life according to the age, educational level, occupation, family economic status, Body Mass Index (BMI), menopause state, duration to restarting intercourse from hysterectomy, discomfort from intercourse, satisfaction from intercourse and duration, sources, and formulation of hormone replacement therapy (HRT). The femininity identity group occupied the largest proportion (31.4%), and then the masculinity identity group (28.1%), the undifferentiated identity group (26.4%), and finally the androgyny identity group (14.1%). There was a positive correlation between femininity and quality of life (r=.276, p=.002). Conclusion: These results indicate that HRT helps the women's sense of loss caused by hysterectomy to be reduced, the postmenopausal symptom after hysterectomy to be relieved and the quality of life to be improved.

• 한국학교보건학회지
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• 제22권2호
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• pp.1-11
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• 2009

Purpose : The purpose of this study was to examine aggression of middle school girls with type of school and gender role identity. Method : The subjects of this study were 526 second-year middle school girls (265 girls in the coeducational middle schools, 261 girls in the girls' middle schools) in Busan. This study was conducted from 14th to 29th of December, 2008 using Korean Sex Role Inventory(KSRI) and Aggression Inventory. Results : 1. There was statistically significant difference in gender role identity types according school types ($x^2$=8.813, p=.032). 2. The whole aggression grade point average was 1.58${\pm}$.40 points(highest score: 4), and reactive-overt aggression was highest in the aggression types(2.06${\pm}$.63). 3. There was not statistically significant difference in aggression of middle school girls according to type of school (t=.188, p=.664). 4. There was statistically significant difference in degrees of aggression according to gender role identity types. The degrees of aggression in masculinity type was highest [grade point average was 1.70${\pm}$.44 points(highest score: 4)]. 5. There was not interactive effect in aggression between type of school and type of gender role identity. Conclusions : The findings of this study contribute to providing basic data for development of education programs or activities for middle school girls to relieve aggression according to gender role identity types.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권12호
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• pp.6214-6242
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• 2019

Routing in mobile ad hoc networks is performed in a distributed fashion where each node acts as host and router, such that it forwards incoming packets for others without relying on a dedicated router. Nodes are mostly resource constraint and the users are usually inclined to conserve their resources and exhibit selfish behaviour by not contributing in the routing process. The trust and reputation models have been proposed to motivate selfish nodes for cooperation in the packet forwarding process. Nodes having bad trust or reputation are detected and secluded from the network, eventually. However, due to the lack of proper identity management and use of non-persistent identities in ad hoc networks, malicious nodes can pose various threats to these methods. For example, a malicious node can discard the bad reputed identity and enter into the system with another identity afresh, called whitewashing. Similarly, a malicious node may create more than one identity, called Sybil attack, for self-promotion, defame other nodes, and broadcast fake recommendations in the network. These identity-based attacks disrupt the overall detection of the reputation systems. In this paper, we propose a reputation-based scheme that detects selfish nodes and deters identity attacks. We address the issue in such a way that, for normal selfish nodes, it will become no longer advantageous to carry out a whitewash. Sybil attackers are also discouraged (i.e., on a single battery, they may create fewer identities). We design and analyse our rationale via game theory and evaluate our proposed reputation system using NS-2 simulator. The results obtained from the simulation demonstrate that our proposed technique considerably diminishes the throughput and utility of selfish nodes with a single identity and selfish nodes with multiple identities when compared to the benchmark scheme.

• 한국정보전자통신기술학회논문지
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• 제13권6호
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• pp.575-589
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• 2020

데이터를 기반으로 한 비즈니스가 폭발적으로 성장함에 따라 개인정보가 포함된 데이터의 중요성이 확대되고 있다. 국내의 경우 데이터 3법이 시행됨에 따라 개인정보가 포함된 데이터 활용 시의 규제 개선 및 명문화를 통해 기업들이 개인정보를 보다 적극적으로 활용할 수 있게 되었다. 이러한 상황에서 서비스 이용에 따른 실명 인증 및 개인정보 제공과 관련해 개인정보 제공을 최소화할 수 있는 자기주권신원기술이 주목받고 있다. 특히, 최근 개인정보 이용에 따른 기록의 명확성 및 증명을 위해 자기주권신원 기능 이용 시 블록체인을 활용한 서비스 및 연구들이 활발하게 이루어지고 있다. 본 논문에서는 국내 자기주권신원 서비스의 특징 및 블록체인 기반 자기주권신원기술과 관련된 연구 현황 및 내용을 분석함으로써 향후 데이터 3법 시대의 개인정보 주권을 강화하기 위한 자기주권신원기술 기반 연구 방향을 제시하고자 한다.

• 대한치위생과학회지
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• 제4권2호
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• pp.19-30
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• 2021

Background: To confirm verbal violence experience in dental hygiene students and to verify its influence on their self-esteem and career identity. Methods: Data were collected using a structured self-reported questionnaire targeting 180 dental hygiene students at M University. Descriptive statistics, one-way analysis of variance, t-test, Pearson's correlation coefficient, and multiple regression analysis were performed using SPSS WIN 25.0. Results: Older students reported that they experienced verbal violence more frequently during clinical training, especially those who were dissatisfied with clinical training. The students experienced verbal violence more frequently from dental hygienists than from dentists and patients. Dental hygiene students had high self-esteem and career identity. The students who were majorly satisfied with clinical training had higher self-esteem and career identity than those who were dissatisfied. Dental hygiene students had lower self-esteem and career identity when they experience verbal violence more frequently from dentists and dental hygienists during clinical training and clinical practice. Conclusion: An intervention program needs to be developed to prevent verbal violence against dental hygiene students and a strategy to increase their self-esteem and career identity is required.