• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권8호
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• pp.3766-3788
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• 2017

A blockchain is an underlying technology and basic infrastructure of the Bitcoin system. At present, blockchains and their applications are developing rapidly. However, the basic research of blockchain technology is still in the early stages. The efficiency and reliability of blockchain communication is one of the research problems that urgently need to be studied and addressed. Existing algorithms may be less feasible for blockchain-based communication because they only consider a single communication factor (node communication capability or node trust degree) and only focus on a single communication performance parameter(communication time or communication reliability). In this paper, to shorten the validation time of blockchain transactions and improve the reliability of blockchain-based communication, we first establish a multi-link concurrent communication model based on trust degree, and then we propose a novel integrated factor communication tree algorithm (IFT). This algorithm comprehensively considers the node communication link number and the node trust degree and selects several nodes with powerful communication capacity and high trust as the communication sources to improve the concurrency and communication efficiency. Simulation results indicate that the IFT algorithm outperforms existing algorithms. A blockchain communication routing scheme based on the IFT algorithm can increase communication efficiency by ensuring communication reliability.

• 아태비즈니스연구
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• 제10권1호
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• pp.39-54
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• 2019

The purpose of this study is to research the effect of organizational culture on trust and communication. Also, the study explores whether trust and communication affects innovative behavior and the mediation effect on innovative behavior among organizational culture, trust and communication. This study analyzed the mediating effect with SEM using data from the HCCP in 2015. The results of the study are as follows. First, it was found that innovative, collective and rational culture positively influence but hierarchical culture negatively influence trust and communication. Second, trust and communication have a positive effect on innovative behavior and trust has a positive effect on communication. Third, the effect innovative, collective hierarchical and rational culture on innovative behavior is mediated through trust and communication. Therefore, this study suggests creating an innovative, relationship-based and goal-oriented organizational culture which increases trust and communication that facilitates innovative behavior.

• 정보과학회 논문지
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• 제42권5호
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• pp.551-557
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• 2015

ARM TrustZone을 이용한 기술은 새로운 임베디드 시스템의 가상화 연구로 관심을 끌고 있다. ARM TrustZone은 secure world와 normal world라는 두 개의 가상 실행 환경을 정의한다. 소프트웨어의 기능을 확장하기 위한 방법으로 ARM TrustZone 환경에서 world 간 통신은 중요하다. 그러나 현재의 모니터 모드의 소프트웨어는 world 간 통신을 충분히 지원하지 않고 있다. 본 논문에서는 ARM TrustZone을 이용한 각 world에서 구동되는 게스트 운영체제 간의 새로운 통신 메커니즘을 제시한다. 제안한 통신 메카니즘은 싱글코어와 멀티코어에서 양방향 world 간 통신을 지원한다. 본 논문에서는 ARM Cortex-A9 MPCore 기반의 NVIDIA Tegra3 processor를 사용하였고, 30MB/s이상의 통신 성능을 보여주었다.

• 지식경영연구
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• 제18권2호
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• pp.23-43
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• 2017

This study analyzes the structural relationships among communication pattern of leader, followers' trust in leader, organizational commitment and innovative behavior. In order to analyze hypotheses, the survey was collected by distributing questionnaire to 250 workers in small and medium-sized companies. As a result, total 213 workers participated in the survey and their rates were included for the test process. The collected data analyzed structural equation modeling, a statistical program. The results of this study are as follows; First, supportive and reflective communication pattern of leader have meaningful positive influences on followers'trust in leader. Directive communication pattern of leader, by contrast, is negatively related to followers'trust in leader. Second, followers'trust in leader has a positive impact on organizational commitment. Third, organizational commitment has a positive effect on followers'innovative behavior. Based on these results, it can be said that followers'trust in leader is more important for boosting organizational commitment and innovative behavior because it has a positive effect on organizational commitment with supportive or reflective communication behavior of leader. Therefore, this study proposes practical benefits to leaders regarding how to display communication process and trust quality more effectively. Future studies are required to investigate the research agendas on the issues between communication patterns and innovative behavior.

• 수산해양교육연구
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• 제27권1호
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• pp.108-114
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• 2015

The purpose of this study is to find the relationships among communication competency, social network centrality(trust centrality and knowledge sharing centrality), discussion performance, and online boarding activity in the team based learning situation. For investigating this topic, 44 students are participated in the classes of educational technology. In order to find out the relationships among communication competency, social network centrality, discussion performance, and online boarding activity, compared t-test and path analysis are used. Followings are the results of the research: (a) Communication competency is improved significantly after team based learning. (b) Trust centrality effects significantly on the knowledge sharing centrality. (c) Knowledge sharing effects significantly on discussion performance. (d) Trust centrality effects on the online boarding activity in the team based learning.

• International journal of advanced smart convergence
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• 제8권4호
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• pp.169-178
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• 2019

Due to the characteristics of an ad hoc network without a control center, self-organization, and flexible topology, the trust evaluation of the nodes in the network is extremely difficult. Based on the analysis of ad hoc networks and the blockchain technology, a blockchain-based node-level trust evaluation model is proposed. The concepts of the node trust degree of the HASH list on the blockchain and the perfect reward and punishment mechanism are adopted to construct the node trust evaluation model of the ad hoc network. According to the needs of different applications the network security level can be dynamically adjusted through changes in the trust threshold. The simulation experiments demonstrate that ad-hoc on-demand distance vector(AODV) Routing protocol based on this model of multicast-AODV(MAODV) routing protocol shows a significant improvement in security compared with the traditional AODV and on-demand multipath distance vector(AOMDV) routing protocols.

• 한국정보전자통신기술학회논문지
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• 제16권6호
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• pp.420-433
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• 2023

ICT 기술의 발달로 데이터를 기반으로 하는 다양한 시스템과 서비스가 도입되면서 데이터, 인프라, 서비스에 대한 신뢰 제공 기술의 중요성이 대두되고 있다. 하지만 기존 ICT 서비스 환경은 특정 서비스를 구성하는 다양한 구성요소의 신뢰(콘텐츠, 인프라, 프로세스, 서비스 제공자 등)를 객관적으로 판단하고 관리할 방법이 없으며, 오로지 서비스 제공자의 자체적인 품질 기준에 의지해야만 하는 한계가 있다. 본 논문은 ITU-T 국제표준 관점의 신뢰성 있는 ICT 서비스 제공을 위한 요구사항, 기능구조, 처리절차를 제공한다. 신뢰할 수 있는 서비스 프로비저닝을 통해 기존 ICT 서비스 주체(서비스 자원, 이해관계자, 사용자)에 신뢰 제공을 위한 부가적인 기능을 추가하여, 관련정보를 수집하고, 분석하여 제공함으로써 사용자는 자신의 요구사항을 기반으로 분석된 신뢰를 기반으로 서비스 구성요소의 신뢰를 고려할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권4호
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• pp.1529-1547
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• 2015

Establishment of trust is important in wireless sensor networks for security enhancement and successful collaboration. Basically, a node establishes trust with other nodes by estimating a trust value based on monitored behavior of the other nodes. Since a malicious/misbehaving node might launch different attack strategies and might demonstrate random misbehavior, a trust estimation method should be robust against such attacks and misbehavior. Otherwise, the operation of trust establishment will be meaningless, and performance of an application that runs on top of trust establishment will degrade. In this paper, we propose a robust and novel trust estimation method. Unlike traditional trust estimation methods, we consider not only the weight of misbehavior but also the frequency of misbehavior. The frequency-of-misbehavior component explicitly demonstrates how frequently a node misbehaves during a certain observed time period, and it tracks the behavior of nodes more efficiently, which is a main factor in deriving an accurate trust value. In addition, the weight of misbehavior is comprehensively measured to mitigate the effect of an on-off attack. Frequency and weight of misbehavior are comprehensively combined to obtain the trust value. Evaluation results show that the proposed method outperforms other trust estimation methods under different attacks and types of misbehavior.

• 한국식품조리과학회지
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• 제26권3호
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• pp.272-280
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• 2010

The purpose of this study was to understand the interrelationships between the customers' perception of verbal and nonverbal communication, customers' trust and satisfaction in the family restaurant. Based on a total of 310 samples that were obtained from empirical research, this study reviewed the reliability and fitness of the research model and verified a total of 2 hypotheses using the Amos program. The hypothesized relationships in the model were tested simultaneously using a structural equation model(SEM). The proposed model provided an adequate fit to the data, $X^2$=953.126(df=417), p<.001, CMIN/df 2.286, GFI .831, NFI .889, IFI .934, TLI .926, CFI .934. The results showed that employees' verbal communication ($\beta$=.264), paralanguage ($\beta$=.172) and physical appearance ($\beta$=.120) among the nonverbal communications had a significant positive effect on the customers' trust. In addition, the customers' trust ($\beta$=.644) had a significant positive effect on the customer satisfaction. Limitations and future research directions are also discussed.

• 한국융합학회논문지
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• 제6권6호
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• pp.213-219
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• 2015

본 연구는 최근 우리의 소통방식에 큰 변화를 불러일으키고 있는 Social Network Service(SNS) 커뮤니케이션 특성이 교수-학생과의 관계형성(교수신뢰, 장기지향성)에 어떠한 영향을 미치는지 검증하는 연구이다. 연구모형은 커뮤니케이션, SNS, 관계 개발의 기존 연구를 기반으로 작성되었다. 연구를 위해 교수와 SNS를 통해 소통하는 대학생을 대상으로 총 210부의 설문을 배부하여 유효한 195부를 분석하였다. 수집된 자료의 분석은 SmartPLS를 활용하였다. 연구결과 독립변수인 커뮤니케이션의 질, 커뮤니케이션의 빈도, 상호작용성, 개방성은 교수신뢰에 유의한 영향을 미치는 것으로 나타났으며 장기지향성에 영향을 미치는 요인으로는 커뮤니케이션의 질, 커뮤니케이션의 빈도, 개방성이 검증되었으며 상호작용성은 교수신뢰의 매개효과를 통해 장기지향성에 영향을 미치는 것으로 나타났다.