• 한국초등과학교육학회지:초등과학교육
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• 제36권3호
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• pp.181-192
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• 2017

In this study, the effects of the small group collaborative learning on students' achievement, the retention of the achievement, communication anxiety, and science learning motivation were investigated. The aptitude-treatment interaction between the level of students' self-directed learning ability and the intervention was also examined. Two classes (38 students) from an elementary school were respectively assigned to a control group and a treatment group. A self-directed learning ability test, a communication anxiety test, and a science learning motivation test were administered as pretests. The intervention lasted for 8 class periods. After instruction, an achievement test, the communication anxiety test, and the science learning motivation test were administered. An achievement retention test were also administered after four weeks. The results indicated that there were significant treatmentaptitude interaction effects in the achievement test scores and the achievement retention test scores. In the communication anxiety and the science learning motivation, however, any significant difference was not found between the scores of the treatment group and the control group. Educational implications are discussed.

• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2003년도 추계학술대회
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• pp.41-54
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• 2003

This study examines group process patterns when Instant Messaging is used for decision-making, and examines how these patterns are associated with creative solutions to problems. Our research suggests that certain communication behavior of a group, when appropriately organized, can enhance creative production of outcomes. A qualitative analysis is conducted on communication patterns based on text-based conversation protocols. Specifically, this research tries to extend existing studies on group-work by focusing on the interactive communication process among participants. Study results include that the production of creative outcome depends on the temporal sequence of discussion pattern among group members. (1) Appropriate control of the discussion process is essential to obtain a high level of performance. (2) It is also important to set up discussion rules and rules for the use of communication medium in the early stages of the discussion . (3) Active participants use various protocol types while less-active members rely mainly on 'cognitive' protocols.

• 디지털융복합연구
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• 제10권4호
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• pp.217-222
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• 2012

그룹 통신은 인터넷을 통해 급속도로 발전 중이며, 그룹통신으로는 화상회의, 인스턴트 메시지, 데스크 탑 공유, 다양한 e-커머스등과 같은 응용프로그램들이 있다. 안전한 그룹통신을 위해서 그룹 키를 생성하여 통신 메시지를 암호화하여 교환함으로써 그룹통신의 기밀성을 보장할 수 있다. 본 연구에서는 그룹 키를 보다 안전하면서 효율적으로 생성하여 안전한 그룹통신에 기여하는데 그 목적이 있다.

• 한국초등과학교육학회지:초등과학교육
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• 제38권4호
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• pp.475-483
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• 2019

The purpose of this study was to investigate the effect of brainwriting instruction on students' experimental design and scientific communication ability in elementary science class. For this purpose, a brainwriting learning for science class was developed and applied. The objects of this study were the 4th graders of both an experimental class (24 students) and a comparative class (24 students) at the N elementary school located in Incheon city. The results of the study were as follows; First, as a result of examining the difference in the experimental design ability between experimental group and comparative group, the experimental group showed higher than the comparative group, it was statistically significant difference(p<.05). Second, a scientific communication ability of the experimental group after applying this program was higher, it was statistically significant differences (p<.05).

• 한국전자파학회논문지
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• 제15권3호
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• pp.265-270
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• 2004

본 논문에서는 group delay가 위성 통신 시스템에 미치는 영향을 분석한다. 일정한 상수가 아닌 group delay에서는 신호의 위상 왜곡이 발생한다. Group delay는 특성에 따라 linear, parabolic, cubic으로 모델링할 수 있다. 각각의 group delay 특성을 위성통신 시스템에 적용하여 BER(bit error rate)을 분석한다. Group delay는 신호의 대역폭이 커질수록 신호에 미치는 영향이 커지는 특성을 갖고 있으며, 위성 통신 시스템의 정보 전송속도가 1Mbps, 4Mbps, 8Mbps 의 세 가지인 경우에 대하여 BER을 분석한다. 이때 channel coding으로는 구속장이 7이고, code rate 1/2인 convolution coding과 7/8 punctured convolution coding 를 이용한다. BER = $10^{-5}$을 만족하는 요구 SNR을 관찰하였을 때, group delay의 영향을 받는 데이터는 group delay의 영향을 받지 않은 데이터에 비해 요구 SNR은 최소 0.3㏈에서 최대 4.4㏈으로 증가한다. 이들 중 group delay에 의한 영향이 가장 큰 경우는 group delay의 특성이 linear 특성이고 channel coding이 7/8 puncture convolution coding, 전송속도가 8 Mbps인 경우로서 이때 요구 SNR은 4.4㏈증가한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권7호
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• pp.3678-3698
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• 2017

With the rapid development of vehicular ad hoc Network (VANET), it has gained significant popularity and received increasing attentions from both academics and industry communities in aspects of security and efficiency. To address the security and efficiency issues, a self-authentication and deniable efficient group key agreement protocol is proposed in this paper. The scheme establishes a group between road side units (RSUs) and vehicles by using self-authentication without certification authority, and improves certification efficiency by using group key (GK) transmission method. At the same time, to avoid the attacker attacking the legal vehicle by RSUs, we adopt deniable group key agreement method to negotiation session key (sk) and use it to transmit GK between RSUs. In addition, vehicles not only broadcast messages to other vehicles, but also communicate with other members in the same group. Therefore, group communication is necessary in VANET. Finally, the performance analysis shows superiority of our scheme in security problems, meanwhile the verification delay, transmission overheard and message delay get significant improvement than other related schemes.

• Agribusiness and Information Management
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• 제6권2호
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• pp.24-31
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• 2014

This paper is a study on what kind of effect non-verbal communication in mobil electronic commerce has on purchase intention and visual attention. For this purpose, the screen of mobile shopping mall produced arbitrarily was exposed to the experimental group and the control group. The experimental group was exposed to the screen of mobile shopping mall that expressed non-verbal communication making use of cinemagraph images and the control group was exposed to the screen of mobile shopping mall based on still images. For the study, survey research and experimental research were conducted simultaneously. Data of survey research were analyzed by MANOVA and t-test, and by using eye-tracker experimental research recorded the duration of time that the subjects stared images. The results of experiment show that in non-verbal communication the experimental group that saw cinemagraph images recorded shorter average staring time than the control group that saw ordinary images, and the cinemagraph had statistically significant effect on visual attention as well. And it was analyzed that non-verbal communication had significant effect on the purchase intention of the experimental group, but had no effect on the purchase intention of the control group. The results can be interpreted that the people who saw cinemagraphs in mobile shopping environment had spent shorter time in seeing products than the people who saw ordinary images, but still the former came to have purchase intention on the products. The results of the present study can be useful for marketers who try to sell agrifood in mobile environment.

• 정보보호학회논문지
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• 제14권4호
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• pp.163-181
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• 2004

그룹 키 동의 프로토콜은 일련의 그룹을 형성하는 다수의 통신 참여자들이 공개된 통신망을 통해 안전하고 효율적인 방법으로 그룹의 세션키를 설정하기 위한 목적으로 설계된다. 하지만, 기존에 제안된 그룹 키 동의 프로토콜들은 모두 상당한 양의 통신 부하를 유발하기 때문에 전송 지연이 긴 WAN 환경에는 적합하지 않다. 이러한 네트워크 환경에서는 특히 라운드 복잡도와 메시지 복잡도가 프로토콜의 수행 시간을 결정하는 핵심 요소들로서, 무엇보다 이들을 줄이는 것이 효율적인 그룹 키 동의 프로토콜의 설계를 위해 중요하다고 할 수 있다. 따라서 본 논문에서는 라운드 수와 메시지 수 측면에서 효율적인 그룹 키 동의 프로토콜을 제안하고, 이의 안전성을 소인수 분해 문제에 기반 하여 랜덤 오라클 모델에서 증명한다. 제안된 프로토콜은 완전한 전방향 안전성과 최적의 메시지 복잡도를 제공하면서도 상수 라운드만에 그룹멤버의 변경에 따른 세션키 갱신을 수행한다.

• 한국콘텐츠학회논문지
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• 제21권11호
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• pp.464-477
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• 2021

이 연구는 대학생들을 대상으로 기성세대와의 세대 간 커뮤니케이션에 영향을 미치는 요인을 조사한 연구이다. 선행연구를 통해 세대 간 커뮤니케이션에 중요한 영향을 미치는 것으로 나타난 변수인 '고정관념'이 세대간 커뮤니케이션 만족도에 미치는 효과를 통계적으로 검증하고, 외집단불안의 매개효과와 커뮤니케이션 능력의 조절효과를 살펴보았다. 분석결과 외집단 불안은 고정관념이 커뮤니케이션 만족도에 미치는 영향을 매개하는 것으로 나타났으며, 이 경로는 성별과 커뮤니케이션 능력에 따라 다르게 나타났다. 남학생 집단과 커뮤니케이션 능력이 높은 집단의 경우에는 고정관념이 외집단 불안에 영향을 주었으나 외집단 불안이 직접적으로 세대 간 커뮤니케이션 만족도에 영향을 미치지 않은 반면, 여학생 집단과 커뮤니케이션 능력이 낮은 집단의 경우 외집단 불안이 세대 간 커뮤니케이션 만족도에 유의한 영향을 미치는 것으로 나타났다. 또한 선행연구 결과와 달리 능력과 관련된 고정관념보다는 인품과 관련된 고정관념이 세대 간 커뮤니케이션에 더 긍정적 영향을 미치는 것으로 나타났다.

• 가정과삶의질연구
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• 제30권1호
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• pp.77-88
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• 2012

This study has developed on Virtues Project program, which enhances parent communication abilities. The purpose of this study is to verify the improvement on parent communication skills after taking a program. To obtain effective children educational direction, we have offered assistance to the parents that understanding the importance of the parental instruction, improvement of the relationship between parents and children. To enhance the parent communication ability, this program is consisted of five virtue strategies, structured activity programs and various self-examination for attending parents to the program rather than listening the lecture. This program is consists of six session with two hours each session for six weeks. I have studied 26 subjects and they were divided into experiment group and control group. According to this study, this program works on improving parent communication skills. Namely, experiment group showed significant enhancement of communication abilities compared to that of control group.