• Journal of Information Processing Systems
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• 제13권6호
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• pp.1613-1627
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• 2017

The concept of the Internet of Things (IoT) enables physical objects or things to be virtually accessible for both consuming and providing services. Undue access from irresponsible activities becomes an interesting issue to address. Maintenance of data integrity and privacy of objects is important from the perspective of security. Privacy can be achieved through various techniques: password authentication, cryptography, and the use of mathematical models to assess the level of security of other objects. Individual methods like these are less effective in increasing the security aspect. Comprehensive security schemes such as the use of frameworks are considered better, regardless of the framework model used, whether centralized, semi-centralized, or distributed ones. In this paper, we propose a new semi-centralized security framework that aims to improve privacy in IoT using the parameters of trust and reputation. A new algorithm to elect a reputation coordinator, i.e., ConTrust Manager is proposed in this framework. This framework allows each object to determine other objects that are considered trusted before the communication process is implemented. Evaluation of the proposed framework was done through simulation, which shows that the framework can be used as an alternative solution for improving security in the IoT.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권1호
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• pp.38-59
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• 2022

Web services instances can be classified into two categories, namely trusted and untrusted from users. A web service with high throughput (TP) and low response time (RT) instance values is a trusted web service. Web services are not trustworthy due to the mismatch in the guaranteed instance values and the actual values achieved by users. To perform web services selection from users' attained TP and RT values, we need to verify the correct prediction of trusted and untrusted instances from invoked web services. This accurate prediction of web services instances is used to perform the selection of web services. We propose to construct fuzzy rules to label web services instances correctly. This paper presents web services selection using a well-known machine learning algorithm, namely REPTree, for the correct prediction of trusted and untrusted instances. Performance comparison of REPTree with five machine learning models is conducted on web services datasets. We have performed experiments on web services datasets using a ten k-fold cross-validation method. To evaluate the performance of the REPTree classifier, we used accuracy metrics (Sensitivity and Specificity). Experimental results showed that web service (WS1) gained top selection score with the (47.0588%) trusted instances, and web service (WS2) was selected the least with (25.00%) trusted instances. Evaluation results of the proposed web services selection approach were found as (asymptotic sig. = 0.019), demonstrating the relationship between final selection and recommended trust score of web services.

• 한국소프트웨어감정평가학회 논문지
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• 제15권1호
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• pp.123-131
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• 2019

IoT(Internet of Things) 환경은 다양한 사용자 애플리케이션을 만드는데 사용할 수 있는 여러 가지 서비스에 대한 액세스를 제공하여 사용자의 요구 사항을 충족시킬 수 있어야 한다. 그러나 수많은 이기종의 장치 및 잠재적인 자원 제약과 같은 IoT 환경적 특징으로 QoS 문제가 발생하게 된다. 본 논문에서는 SOA기반 IoT 시스템에서 사용자간 신뢰관계를 반영한 QoS 예측 방법을 제안한다. QoS예측의 정확도를 높이기 위해, 사용자간 신뢰 관계를 분석하여 사용자들 사이의 유사성을 파악하고 이를 기반으로 QoS를 예측하도록 한다. 연결중심성을 계산하여 신뢰를 강화하도록 하였으며, 실험을 통해 QoS 예측의 향상이 이루어지는 결과를 얻을 수 있었다.

• 한국의류학회지
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• 제33권4호
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• pp.622-633
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• 2009

I need to study variations which affect Chinese internet shopping-mall vendor and Chinese buyer's long term relationship and utilize that insight on marketing strategy. For that, I studied effect of shopping propensity, internet shipping-mall quality on satisfaction, trust, commitment and purchase intention of fashion products, mainly fashion goods consumers in their 20s-30s at Shanghai and Beijing. 453 respondents' survey was used for this study by random sample selection and analyzed through frequency analysis, factor analysis, regression analysis, cross-tab, ANOVA test with SPSS12.0. Through this study, I found out that Chinese fashion goods consumer can be categorized as information seeker, variety seeker and innovation seeker. Among them, innovation seeker was most sensitive on shopping mall's quality, satisfaction, trust, commitment and purchase intention and Chinese consumer's evaluation on internet shopping-mall' perceived quality affect satisfaction, absorption, trust and fashion goods purchase intention. Based on that, I need to understand more about target consumer before enter the market, because there is difference of shopping-mall quality, satisfaction, trust, absorption and purchase intention according to shopper's propensity and demographic factors.

• 한국콘텐츠학회논문지
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• 제17권1호
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• pp.662-672
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• 2017

최근 모바일 기기와 근거리 무선 통신 기술 등의 발달로 기존 중앙 집중 처리 시스템의 한계를 개선하기 위해 모바일 P2P 네트워크에 대한 연구가 활발하게 진행되고 있다. 모바일 P2P네트워크에서 피어는 배터리, 메모리, 저장 공간 등과 같은 제한적인 요소들을 가진다. 모바일 P2P 네트워크에서 안전한 콘텐츠 공유를 위해서는 피어의 신뢰성이 판별되어야 한다. 본 논문에서는 제한된 모바일 P2P 네트워크에서 신뢰도를 판별하는 기법을 제안한다. 제안하는 기법은 피어의 평가 정보를 이용하여 직접적으로 피어가 평가한 값과 다른 피어가 평가한 간접적인 평가 값을 이용하여 피어의 신뢰성을 판별한다. 피어가 가지는 평가 정보로 최근 갱신 시간을 활용한다. 피어 평가 정보의 최근 갱신 시간을 비교하여 평가 정보 공유 시 중복되는 평가 정보를 감소시킨다. 성능 평가를 통해 제안된 기법이 메시지 수를 감소시키며 신뢰성에 대한 정확도를 향상 시키는 것을 입증한다.

• 한국조경학회지
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• 제30권2호
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• pp.39-49
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• 2002

The purpose of this study is to propose an objective and rational methodology for the selection of proposed sites far the National Trust(NT), which is the new alterative proposal far the conservation of natural environments destroyed by injudicious land development and economic growth. That is to enforce many analysis for the effective estimation of rare ecological and landscape resources and to propose a model based on estimation and united indicators. Using the estimative model, we apply it to the selection of the proposed site in micro scale and simultaneously offer the basic methodology of effective and systematic land conservation in macro scale. The results of this study are as follows: 1) The results of analysis for the reliability of estimative items and indicators, presented no problem in that the coefficient of reliability was over 0.7. 2) The correlation measure of the estimative indicator indicated that 'succession'and 'regenerating restorability' were highly correlative in the item of plants. Another three items showed a tendency to be alike. 3) The results of factor analysis on the characteristics of indicators, classified plants into four categories including a stable factor. The item of animals was classified as a stable and rare factor. The item of landscape was classified as a physical and mental factor and the environment as a pollutional and conditional factor. 4) The model of estimation created through factor analysis was valid for the approval of the regression model because significant probability was 0.00. When we consider the NT proposed site as a complex body that is composed of diverse natural and manmade resources, certainly the synthetic methodology of estimation is needed. If these studies are carried out, NT sites will be selected more rationally and effectively than at present. Consequently, they have the potential to play a core role of natural ecosystem conservation in Korea.

• 정보보호학회논문지
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• 제24권2호
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• pp.373-384
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• 2014

소셜 네트워크 서비스는 인터넷상에서 다른 사람들과 친구 또는 사회적 관계를 맺을 수 있는 양방향 서비스로써 개방성을 바탕으로 인적 교류 네트워크의 중심이 되었다. 그러나 최근에는 개방성을 악용하여 신뢰할 수 없는 유언비어가 확산되고 개인 정보를 침해하는 다양한 공격으로 인해 여러 사용자들이 피해를 보는 사례가 발생하였다. 따라서 소셜 네트워크상에서의 정보는 신뢰할 수 있는 사람에게 전달하거나 혹은 제공 받을 수 있어야 한다. 최근의 신뢰도 연구에서는 사용자와 밀접한 한 홉 사이를 기반으로 한 신뢰도 평가방법들이 주로 제시되었다. 그러나 소셜 네트워크의 교류가 기존의 시공간성이 갖는 제약을 넘어서고 사용자도 큰 폭으로 늘어나면서 한 홉 사이뿐 아니라 여러 홉 사이에서의 교류 역시 최근에 많이 증가하고 있다. 이러한 흐름에 맞춰 본 논문에서는 전이성 및 결합성을 이용하여 원거리에서도 신뢰도 평가가 가능한 효과적인 사용자 신뢰도 평가 스킴을 제안한다.

• 디지털산업정보학회논문지
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• 제13권2호
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• pp.43-51
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• 2017

Recently, MANET has been used in many fields as the range of applications increases. However, the dynamic topology that MANET has makes it difficult to route and provides the cause of exposure to security vulnerabilities. Therefore, the security features that can be robust to many attacks must have been applied in the routing technique provided in the MANET. In this paper, we propose a secure routing method that secure route is established by reliability evaluation of nodes and secure data communication has applied through key exchange mechanism. The proposed technique used hierarchical structure for efficiency of reliability evaluation of nodes. The reliability of nodes is performed by trust management node and reliability of nodes managed periodically is broadcasted. And the key exchange for secure data transmission is dene without CA as the certificate issuing organization. This allows fast key exchange and the integrity of data transmission improved. The proposed technique improves the security of the data transmission because a secure route to the destination node is established by the reliability evaluation and the data transmission is performed after the key between the source node and the destination node is exchanged through the established route.

• 한국환경교육학회지:환경교육
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• 제15권1호
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• pp.83-100
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• 2002

This study introduced various theories and related studies on the evaluation of informal environmental education programs and suggested an evaluation procedure for them. The case study on the procedure and the result of Non-indigenous, Invasive Species Management/Education program evaluation was provided, which was conducted by Cornell University in cooperation with Cornell Cooperative Extension, The Nature Conservancy, and Finger Lake Land Trust. The procedure model that was used in this study was based on Herman et al. (1987) and slightly modified for the environmental education program evaluation. The procedure and results indicated that the implementation of NIS management/education program properly accomplished it's intended goal and objectives. This study also specifically described its implications for the evaluation of environmental education programs in informal settings.

• 복식문화연구
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• 제23권4호
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• pp.537-553
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• 2015

Recently, some fashion retailers have initiated sustainable actions in the form of corporate social responsibility (CSR) activities to address consumers' social concerns. This study intends to combine the concept of CSR motivation attributions with brand extension literature in order to examine how consumers' trust of a parent brand affects their CSR motivation attributions and ultimately their attitudes towards parent-brand CSR activities and sustainable extension lines. A self-administered online survey was conducted using scenarios describing a fast fashion retailer introducing a sustainable line. Data from 303 female U.S. consumers, aged between 18 and 34 years, were used for the statistical analysis. Data analyses were conducted using SPSS 21.0 for descriptive analysis, exploratory factor analysis, and regression analysis. The results revealed that all hypotheses were supported. The findings show that consumers' trust of a parent brand has an indirect impact on positive attitudes towards the parent brand's CSR activities as well as the sustainable extension product line, mediating positive evaluations of the brand's social CSR motivations. In addition, this study suggests consumers' prior trust of the parent brand is a variable that affects consumers' evaluation of CSR motivation sincerity. Marketing suggestions and thoughts based on the findings of this study were provided.