• 산업공학
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• 제22권2호
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• pp.185-191
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• 2009

In this study, we propose an improved group location tracking scheme (GLS) called integrated GLS (IGLS) which, in addition to the group location registration of the GLS, sends an integrated group registration message to a virtual visitor location register (VVLR) instead of sending an individual group registration message. This integrated procedure of proposed scheme leads registration cost of group registration and group location registration to be reduced significantly. Numerical results demonstrate that our proposed IGLS outperforms conventional GLS and delayed GLS (dGLS). The IGLS can be applied effectively on public transportation systems such as subway, train and bus.

• 한국인터넷방송통신학회논문지
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• 제15권5호
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• pp.9-17
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• 2015

무선 통신 기술의 발전과 ICT 시장의 변화에 따라 M2M 서비스 활성화 및 기술은 지속적인 발전을 거듭하고 있다. 사람의 제어나 직접적인 개입 없이 사물과 사물간의 통신환경을 구축하는 M2M 환경이 주목받고 있다. 무선 통신 환경의 특성으로 데이터 노출, 위조, 변조, 삭제, 프라이버시 등의 문제에서 다양한 보안 위협에 노출 될 가능성과 안전한 통신 보안 기술이 중요 요구사항으로 이슈화되고 있다. 본 논문은 트랩도어 충돌 해쉬의 요구사항을 분석하고, 트랩도어의 특수성을 이용하여 M2M 환경에서 그룹간의 키를 생성하고, 이를 세션키로 교환하는 기법을 제안한다. 그리고 그룹키 생성에 이은 디바이스와 게이트웨이의 인증을 확인하는 기법을 제안한다. 제안하는 기법은 충돌 메시지와 충돌 해쉬의 특수성을 이용하여 그룹 통신 구간의 위장 공격, 중간자 공격, 재전송 공격 등의 공격 저항성을 가지는 안전한 기법임을 확인하였다.

• 대한전자공학회논문지TC
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• 제43권7호
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• pp.60-71
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• 2006

공개된 네트워크상에서 안전하게 그룹 통신을 하기 위해서는 그룹 구성원간에 공통의 비밀키를 안전하고 효율적으로 설정할 수 있는 방법이 필요하며, 이러한 목적으로 설계되는 프로토콜을 그룹 키 동의 프로토콜이라고 한다. 그룹 키 동의 프로토콜에 관한 연구는 그동안 많은 연구자들에 의해 다양한 관점에서 진행되어 왔으며, 최근 들어 유 무선 통합 네트워크 환경에서의 안전한 그룹 통신을 위한 그룹 키 동의 프로토콜에 대한 연구가 진행되고 있다. 유 무선 통합 네트워크 환경에 적합한 그룹 키 동의 프로토콜을 설계하기 위해서는 고성능 연산 능력을 가진 유선 단말기의 특성과 상대적으로 계산능력이 떨어지는 무선 단말기의 특성이 함께 고려되어야 한다. 특히, 시스템 자원의 제한성을 갖는 무선 단말기에서의 계산량을 최소화하는 문제는 그룹 키 동의 프로토콜 설계에 있어서 무엇보다 중요하다. 본 논문에서는 무선 단말기의 계산량을 최소화하면서 유 무선 통합 네트워크 환경에 적합한 효율적인 그룹 키 동의 프로토콜을 제안하고 그 안전성을 증명한다.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.183-183
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• 2004

• 수산해양교육연구
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• 제17권1호
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• pp.26-34
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• 2005

The purpose of this study was to investigate the influence of physical activity on communication and adaptation to school life of elementary school students. Seventy-two students (male 37; female 35) from two classes participated in the experiment. One class served as an experimental group and the other as a control group. The program consists of 16 sessions. Participants completed the Communication Scale and School Adjustment Scale. The collected data were analyzed by using t-test and covariance analysis. The results of the analysis showed that there were statistically significant differences between elementary school students who participated in physical activity and ones who did not in terms of communication and school life adaptation. Based upon these results, it is concluded that physical activity is effective for communication and school life adaptation of elementary school students.

• 수산해양교육연구
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• 제28권1호
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• pp.300-314
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• 2016

The purpose of this study was to examine the effects of small-group discussion and panel discussion as teaching and learning methods on college students' competencies of communication, problem-solving and leadership in a general education course. Participants were 52 college students, and they participated in the 13-session lessons. The data from questionnaires collected before and/or after the experiment were analyzed using a paired t-test and percent. The results were as follows. First, each 'total' competency in communication, problem-solving and leadership was increased statistically significant after the experiment. Second, in subdomains of each key competency, 'directed communication' and 'understanding the perspective of others' in communication, and 'divergent thinking', 'decision-making' and 'assessment' subdomains in problem-solving, and all subdomains in leadership were increased statistically significant after the experiment. Based on the results and students' opinions about discussions, the education implications for small-group discussion and panel discussion were discussed.

• 아동학회지
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• 제18권2호
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• pp.229-240
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• 1997

This study analyzed the effects of teacher's scaffolding on children's verbal communication in dramatic play. Twenty-four five-year-old kindergarten children participated. The collected data were analyzed with the repeated measures analysis of variance and two-sample t-tests. The results showed that: the frequency of verbal communication strategies and children's episode length increased in the experimental group where the teacher intervened with the scaffolding. Children in the experimental group showed more positive response in the categories of minimal acceptances and enlarged acceptances. No gender differences were found.

• 정보보호학회논문지
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• 제13권5호
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• pp.3-15
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• 2003

안전한 그룹 통신은 그룹에 속한 멤버들만이 안전하면서도 비밀스럽게 서비스를 받을 수 있도록 보장하는 것이며, 안전한 그룹 통신을 하기 위해서는 안전하게 그룹키를 분배하고, 그룹 멤버들에 대한 효율적인 관리가 중요하다. 또한, 그룹키를 생성, 분배 그리고 갱신하는데 있어 적은 통신량과 연산량이 필요하다. 본 논문에서는 그룹키를 생성하기 위해서, 잘 알려진 두 멤버간의 Diffie-Hellman 키 교환과 완전 이진 트리를 이용한 새로운 방법를 제안한다. 본 논문에서는 많은 양의 모듈러 멱승 연산의 일부를 곱셈 연산으로 대체하여 한 멤버에게 필요한 멱승 연산량을 최소화시킨다. 그리하여, 제안한 프로토콜은 그룹의 크기에 관계없이 프로토콜을 수행하기 위하여 각 그룹의 멤버는 항상 일정한 모듈러 멱승 연산과 곱셈 연산을 수행하며, 기존 프로토콜보다 전체 모듈러 멱승 연산량도 적다.

• 한국간호교육학회지
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• 제14권1호
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• pp.5-11
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• 2008

Purpose: The purpose of this study was to identify the effects of interpersonal relationships and communication curriculum on interpersonal relations and self-esteem. Method: This study employed a two-group pre-post test study design. Data was collected from 70 subjects from April to June, 2006 at C university in Jeju, Korea. Forty subjects were in the control group and 30 subjects were in the experimental group. A structured curriculum was conducted for the experimental group once a week for 12 weeks, but not for the control group. For both groups the scores of interpersonal relations and self-esteem were measured before and after the curriculum. Data was analysed by $X^2$-test, t-test, paired t-test and Pearson correlation with SPSS. Results: The scores of interpersonal relations and self-esteem significantly increased in the experimental group. There were significant positive correlations between interpersonal relationships and self-esteem. Conclusion: In light of these results, interpersonal relationships and communication curriculum have a positive effect on interpersonal relations and self-esteem. Therefore, this study can provide basic data and direction in developing and applying a curriculum in education.

• 성인간호학회지
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• 제23권3호
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• pp.267-277
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• 2011

Purpose: The purpose of this study was to evaluate the effects of a sex education program for middle aged men patients with diabetes and their spouses. Methods: The research design for this study was a non-equivalent control group quasi-experimental study. The subjects were 23 diabetic patients and their spouses with half of the subjects exposed to a structured sex education program. Sexual Beliefs and Information Questionnaire, Dyadic Sexual Communication Scale, Sexual Frequency Scale, Derogatis Sexual Function Inventory and International Index of Erectile Function-5 were used for data collection. Results: In the experimental group, sexual knowledge of diabetic patients and sexual communication with their spouses were improved after two weeks following the program. Also, in the experimental group, sexual knowledge, sexual communication, and sexual frequency in both diabetic patients and their spouses were improved after six weeks following the program. In the experimental group, sexual satisfaction of diabetic patients was improved after six weeks following sex education program, however their spouses in the experimental group showed no significant differences than those of the comparison group. Conclusion: The results of this study suggest that sex education program for both diabetic patients and their spouses could be utilized in public health centers, hospitals, and clinics.