• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제5권2호
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• pp.101-115
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• 2001

Recent theoretical analysis of numerical methods for solving nonlinear systems of equations is represented by alpha theory of Newton method developed Smale et al. The theory was extended to Secant method by providing convergence conditions by Yakoubsohn which the Secant method is treated as an operator defined for analytical functions. We use Secant methods as an iterative scheme with approximations, which results in new convergence conditions. We compare the two conditions and show that the new conditions represent the features of Secant method in a more precise way.

• Bulletin of the Korean Chemical Society
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• 제10권3호
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• pp.309-314
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• 1989

The interaction energies of Xenon in n-alkanes were estimated by using three models for the cavity formation process, Hildebrand's regular solution theory, Pierotti's scaled particle theory and Sinanoglu-Reiss-Moura-Ramos' solvophobic theory in an attempt to examine the validity of three models. It appears that Pierotti's implementation of scaled particle theory yields a reasonable estimate of cavity formation energy over a considerable range in solvent size provided that the solute is spherical enough as are the inert gases.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.1058-1061
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• 1993

Fuzzy set theory has been extensively researched in various fields of engineering. In nuclear science, a significant influence of fuzzy sets can be noticed. However, applications of fuzzy set theory to nuclear engineering is novel. In this paper, we start with a basic statement of the decision-making process based on fuzzy set theory, and then apply it to nuclear science with some practical applications (a fuzzy decision making in an accidental release to the atmosphere as well as in a problem of land suitability classification). We believe that the use of fuzzy set theory in nuclear science has potential advantages.

• Journal of Information Technology Applications and Management
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• 제17권4호
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• pp.83-105
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• 2010

Smartphone services seem to be appealing to people worldwide and show rapid growth in mobile service market. Based on the theoretical framework like attachment theory and self-congruity theory, we developed the research model and proposed six hypotheses. An analysis of 113 smartphone service users found that continued use intention in smartphone services is affected by uses' attachment to the service. We also found that the attachment is significantly increased by self-congruity, customization, and perceived usefulness. Our aim was to gain insight into ways of creating an environment that facilitating continued use intention of smartphone services. This study has important implications for academic researchers and practitioners who seek to understand why smartphone service users continuously use their smart phone services. Other practical implications of these findings and future research implications are also discussed.

• 한국정보시스템학회지:정보시스템연구
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• 제15권4호
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• pp.55-72
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• 2006

The total market capacities of our domestic on-line shopping malls had reached over one billion wons in 2005. They are also estimated to reach 1.8 billion wons in 2008. In order to reveal some relationships between six antecedent variables and intention-to-use of online shooing malls, this study has extended the original TAM2 model using these variables obtained from (1) perceived usefulness and perceived ease of use from TAM2 model, (2) compatibility from IDT theory, (3) perceived enjoyment from Flow theory, and (4) others (perceived risk and self efficacy). Two statistical packages such as SPSS 12.0 and Lirel 8.70 were used for data analyses. Among these seven proposed hypotheses, six hypotheses were accepted while one hypothesis regarding perceived risk was rejected. As perceived risk hypothesis concerning the intention-to-use was rejected, the perceived risk did not show the support of the intention-to-use.

• 한국IT서비스학회지
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• 제8권1호
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• pp.11-27
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• 2009

Recently, IPTV attracts great attention along with the digital convergence of communication and media technologies. This study examined critical factors on the consumer's continued use of the IPTV service. Based on the expectation-confirmation theory and the innovation diffusion theory, we derived nine key factors in the research model-relative advantage, compatibility, ease of use, image, diversity of contents, interactivity, monetary value, social influence, and user satisfaction. Using the partial least square method, we found that content diversity and compatibility have a significant indirect effect on the continued use of the IPTV service via user satisfaction, and user satisfaction and social influence also have a significant direct impact on the IPTV use. These findings not only provide practical insights on the consumer acceptance of new technology-converging services, but also help managers to plan their marketing strategies better.

• 벤처창업연구
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• 제17권2호
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• pp.153-165
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• 2022

코로나19 팬더믹 사태로 인해 교육 및 학습 활동이 온라인으로 이동할 수밖에 없게 되면서, 교육 및 학습에 정보통신기술을 사용하는 것은 더이상 선택이 아닌 필수 요소가 되었으며, 에듀테크(Edutech) 스타트업에 대해 벤처캐피탈은 역대 최대 투자액을 투자하고 있다. 이러한 상황에서 본 연구는 디지털 시대에 필수능력인 된 디지털 리터러시와 함께 통합기술수용이론(UTAUT: Unified Theory of Acceptance and Use of Technology)을 같이 고려하여, 학습에서 디지털기술을 사용하려는 의도에 영향을 미치는 요인들에 대해 연구하였다. 또한 디지털 리터러시에 많은 영향을 끼친다고 알려져 있는 요소인 연령에 따라 달라지는 요인들의 영향력 차이를 분석하였다. 구조 방정식 모형 분석 결과, 성과기대, 노력기대, 사회적 영향이 학습에서 디지털기술을 사용하려는 의도에 긍정적인 영향을 미치는 것으로 나타났으며, 디지털 리터러시는 성과기대, 노력기대, 사회적 영향에 긍정적인 영향을 끼치는 것으로 드러났으나 학습에서 디지털기술을 사용하려는 의도에 직접적으로 끼치는 영향은 유의하지 않게 나타났다. 그리고 연령의 조절효과를 보기 위해 실시한 다중집단분석 결과, 사회적 영향이 학습에서 디지털기술을 사용하고자 하는 의도에 미치는 경로에 대해 10대와 60대, 20대와 60대, 30대와 60대간의 차이가 유의하게 줄어드는 것을 알 수 있었다. 본 연구는 이론적 측면에서 디지털 리터러시와 통합기술수용이론을 함께 고려하여 학습이라는 특정상황에서 디지털기술을 사용하고자 하는 의도에 미치는 요인에 대한 연구의 외연을 확대하는데 기여했으며, 실무적 측면에서 학습 참여자들이 보다 적극적으로 디지털기술을 사용하게 만들 때에 연령별로 주요하게 고려해야할 요인에 대한 지침으로 활용할 수 있을 것이다.

• 지식경영연구
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• 제17권1호
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• pp.17-47
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• 2016

People use social network services (SNSs) for various purposes, for example, to share information, to express themselves, and to strengthen social relationships with others. Meanwhile, problems of personal information leakage and privacy infringement become a social issue and thus information privacy concerns about inappropriate collection and use of personal information increase in SNSs (e.g., Facebook). Although people have privacy concerns in SNSs, they behave in a contradictory way, voluntarily presenting themselves and disclosing personal information. This phenomenon is called 'privacy paradox'. Using dual factor theory, this study investigates the phenomenon of privacy paradox by looking into enablers (e.g., self-presentation) and inhibitors (e.g., information privacy concern) for continuous use of Facebook that can co-exist independently of each other. It also includes antecedents of self-presentation (i.e., narcissism, need for affiliation, involvement, and self-efficacy) and those of information privacy concern (i.e., previous experience of privacy infringement, privacy awareness, and privacy control). The results show that most hypothesized relationships were supported. These findings provide strategic implications for SNS providers who want to promote continuous use of SNS. Under the current circumstances in which enhanced privacy policies are required, this study would be a useful reference for future research on information privacy issues in SNSs.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.569-572
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• 2013

플로우 이론에 근거해서 본 연구는 개인의 성격이 UCC를 활용할 때 개인의 플로우 경험과 사용형태에 어떠한 영향을 미치는 가를 탐색하고자 한다. 연구결과는 외향성은 사용자가 오락의 목적으로 UGC를 활용할 때 긍정적인 영향관계를 보인다고 시사하고 있으며, 반면 커뮤니케이션이나 정보추구의 목적일 때는 부정적인 관계가 있음을 나타냈다. 한편, 신경성은 오락 및 커뮤니케이션 목적의 UGC 활용과 긍정적인 관계가 있었으며, 정신병리적 성향의 경우 정보추구적 목적의 UCC 활용과 부정적인 관계를 보였다. 본 연구는 플로우의 선행요인과 영향요인을 포함한 실증연구를 제시함으로써 플로우 이론을 확장함에 그 의의가 있다.

• The Journal of Asian Finance, Economics and Business
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• 제7권10호
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• pp.295-302
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• 2020

The study examines an empirical case that explores the key constructs of the Unified Theory of Acceptance and Use of Technology (UTAUT) (Venkatesh, Morris, Davis & Davis, 2003) and the relationship between security and privacy of the Theory of Perceived Risk (TPR) (Bauer, 1960). This study employs survey data of 200 young Internet users aged 18 to 25. The study was conducted through two steps: preliminary research by qualitative research method to form the official research scale then formal research by quantitative research method using CFA and SEM to test the research model. The research results show that performance expectancy and social influence significantly predict behavioral intention to use e-wallets in payment. In contrast, the factors, namely, security and privacy, and effort expectancy, are statistically insignificant on behavioral intention. Nevertheless, the facilitating conditions factor still affects the behavior of using e-wallets. The study proposes a model to generalize the online payment environment through the integration of UTAUT and TPR models that are important for online payment management and researchers in the technology environment. The findings of this study suggest that social influence significantly affects the intention of young people to use e-wallets instead of security and privacy.