• Journal of Mechanical Science and Technology
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• 제20권11호
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• pp.1790-1800
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• 2006

Dynamic behavior of flexural-torsional coupled vibration of rotating beams using the Rayleigh-Ritz method with orthogonal polynomials as basis functions is studied. Performance of various orthogonal polynomials is compared to each other in terms of their efficiency and accuracy in determining the required natural frequencies. Orthogonal polynomials and functions studied in the present work are: Legendre, Chebyshev, integrated Legendre, modified Duncan polynomials, the special trigonometric functions used in conjunction with Hermite cubics, and beam characteristic orthogonal polynomials. A total of 5 cases of beam boundary conditions and rotation are studied for their natural frequencies. The obtained natural frequencies and mode shapes are compared to those available in various references and the results for coupled flexural-torsional vibrations are especially compared to both previously available references and with those obtained using NASTRAN finite element package. Among all the examined orthogonal functions, Legendre orthogonal polynomials are the most efficient in overall CPU time, mainly because of ease in performing the integration required for determining the stiffness and mass matrices.

• 복식문화연구
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• 제17권6호
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• pp.1155-1172
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• 2009

Wearable computers can be defined as next generation clothing integrated with various digital functions and devices. Unlike existing computers, they are viewed as human-centric computers customized for information utilization and other specific human needs. This study is intended to discover how consumers are accepting wearable computers, which are different from existing computers, based on Technology Acceptance Model(TAM) and to extend the model by adding variable regarding acceptance of wearable computers. A total of 683 copies of questionnaires, distributed to those aged 19 and older, both male and female, were collected online. The data was statistically analyzed for this study using the extended TAM. In order to test hypotheses, the structural equation model using the Lisrel 8.30 version was performed. For analyzing constructs(or traits) of research model, exploratory factor was conducted and the measurement model was assessed from the result. Reliability was assessed through confirmatory factor analysis and the calculation of Cronbach's alpha coefficients. Overall, model fit was assessed by statistical indexes: Chi-square value, GFI, AGFI, and RMR. This study analyzed the process of acceptance of wearable computers with the extended TAM that includes a variable, perceived value, on the basis of previous studies. The results of the analysis revealed that attitude toward wearable computer was directly influenced by perceived usefulness and perceived value but indirectly influenced by perceived ease of use. Acceptance intention of the wearable computer was directly influenced by perceived value and attitude toward wearable computer. To be more specific, perceived usefulness was significantly correlated with both attitude toward wearable computer and acceptance intention of the wearable computer. Perceived value was also significantly correlated with both attitude toward wearable computer and acceptance intention of the wearable computer. The results of this study also suggested that perceived ease of use was actually a causal antecedent to perceived usefulness and perceived value. This research revealed that extended TAM to investigate the acceptance of wearable computer was appropriate. This study is intended to provide a theoretical framework for adoption of wearable computer and suggest empirical analysis that can serve as a guide for wearable computer.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.181-184
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• 2009

The hot press farming process, which is the press hardening of steel parts using cold dies, can utilize both ease of shaping and high strength due to the hardening effect of rapid quenching during the pressing. In this study, a thermo-elastoplastic analysis of the hot press forming process using the finite element method was performed in order to investigate the deformation behavior and temperature history during the process and the mechanical properties of the pressed parts.

• 센서학회지
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• 제22권2호
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• pp.111-117
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• 2013

The autonomous driving method using magnetic sensors recognizes the position by measuring magnetic fields in autonomous robots or vehicles after installing magnetic markers in a moving path. The Position estimate method using magnetic sensors has an advantage of being affected less by variation of driving environment such as oil, water and dust due to the use of magnetic field. It also has the advantages that we can use the magnet as an indicator and there is no consideration for power and communication environment. In this paper, we propose an efficient sensor system for an autonomous driving vehicle supplemented for existing disadvantage. In order to efficiently eliminate geomagnetism, we analyze the components of the horizontal and vertical magnetic field. We propose an algorithm for position estimation and geomagnetic elimination to ease analysis, and also propose an initialization method for sensor applied in the vehicle. We measured and analyzed the developed system in various environments, and we verify the advantages of proposed methods.

• 지능정보연구
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• 제29권2호
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• pp.149-170
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• 2023

본 연구에서는 확장된 기술 수용 모델을 적용하여 사용자의 메타버스 사용 의도에 영향을 미치는 요인을 분석했습니다. 즉, 확장된 기술수용모델의 관점에서 메타버스 이용의도에 영향을 미치는 요인을 기술적 특성(원격실재감, 상호운용성, 연속성, 동시성, 경제적 흐름)과 개인적 특성(사회적 영향력, 지각된 즐거움)으로 정의하고, 메타버스 이용의도에 영향을 미치는 요인들을 분석했습니다. 이를 위해 10대부터 60대까지 다양한 연령대의 남녀를 대상으로 설문조사를 실시했으며, 327명의 참여자로부터 수집된 데이터는 SPSS 22.0과 Smart PLS 4.0을 사용하여 분석했습니다. 그 결과 확장된 기술 수용 모델의 선행 요인인 지각된 유용성과 지각된 사용 용이성이 메타버스 사용 의도에 영향을 미치고, 지각된 사용 용이성은 지각된 유용성에 영향을 미치는 것으로 나타났습니다. 원격실재감, 상호운용성, 경제성 흐름은 인지된 유용성에 긍정적인 영향을 미치는 것으로 나타났으며, 상호운용성, 연속성, 동시성은 인지된 사용 용이성에 긍정적인 영향을 미치는 것으로 나타났습니다. 또한 사회적 영향력과 지각된 즐거움은 메타버스 사용 의도에 긍정적인 영향을 미치는 것으로 나타났습니다. 본 연구는 우리의 일상과 플랫폼 소비 환경에 큰 변화를 가져올 새로운 플랫폼으로 주목받고 있는 메타버스에 대한 사용자의 수용 요인을 실증적으로 분석했다는 점에서 의의가 있습니다.

• 한국정보시스템학회지:정보시스템연구
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• 제15권4호
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• pp.73-98
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• 2006

The purpose of this study was to verify and analyze the factors that influence the acceptance intention of u-Commerce users under ubiquitous computing environments. To accomplish this, the Technology Acceptance Model(TAM) of Davis(1989), which has widely been cited in new technologies such as information technology(IT) and information systems(IS) studies was used to develop the research model. First of all, personal characteristics affecting the acceptance intention of u-Commerce were identified as individual variables through literature review. Utilizing the use of the individual variables and the TAM model, the u-Commerce acceptance intention model was established. The research findings indicated that IT acceptance forms and frequencies in IT use did not have a significant impact on perceived usefulness and perceived ease of use of u-Commerce. It was also found that the perceived usefulness proposed in the u-Commerce acceptance model influenced the perceived usefulness. Both ease of use and usefulness were identified to influence attitude for use. Finally, usefulness and attitude for use also positively influenced acceptance intention. The contribution of this study was the examination of the factors affecting acceptance intention of users in u-Commerce and the verification of the usefulness of the TAM model in describing the acceptance of u-Commerce users using structure acceptance model. Furthermore, this study has empirically analyzed how personal characteristics widely used in the study of acceptance of IT can influence the acceptance of u-Commerce.

• 한국컴퓨터정보학회논문지
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• 제27권2호
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• pp.71-80
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• 2022

본 연구는 팬데믹 이후 게임 시장에서 이례적인 흥행을 거둔 콘솔 게임인 '모여봐요 동물의 숲(이하 모동숲)'의 사용자 경험에 접근해서, COVID-19라는 환경적 영향력과 모동숲간의 관계성을 규명하고자 했다. 기술수용모델(TAM)을 기반으로 모동숲 이용자의 인지된 유용성(PU)과 인지된 이용용이성(PEOU)이 게임 만족도 및 몰입도에 미치는 영향력, 이용 태도와 향후 이용 의사와의 관계성을 온라인 설문조사를 통해 실증적으로 검증했다. PU의 경우, 모동숲의 꾸미기 요소는 힐링 효과를 발생시켰으며, 모집단의 과반수 이상은 온라인 커뮤니티에 게임 활동을 공유했다. PEOU의 경우, 모집단은 모동숲의 기술적 발전(그래픽, 사운드 등)에 대해 긍정적으로 평가했으며, 게임에 대한 높은 만족도와 몰입도는 향후 이용 의사에 긍정적으로 작용했다. 또한 COVID-19와 모동숲의 성공 간 유의미한 관계성이 도출되었으나, 다른 장르 및 플랫폼의 게임에서의 적용 가능 여부를 검증하기 위한 후속 연구가 요구된다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2003년도 추계학술대회 및 정기총회
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• pp.144-147
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• 2003

It is important to understand the process of technology diffusion among end users for effectively implementing adoption and coping with frequent changes in the environment. Previous studies indicate that information and communication technology (ICT) adoption is affected by innovation influence such as usefulness, ease of use and self-efficacy. Most of these studies, however, bypassed imitation influence such as subjective norms, word-of-mouth, and advertising, specifically, interactive innovation having critical mass in technology acceptance research. Thus, this study investigates imitation influence in individual adoption of mobile communication technology, more specifically, mobile phones, using Mahaian's diffusion model in individual ICT adoption.

• 한국산업정보학회논문지
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• 제26권3호
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• pp.59-69
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• 2021

글로벌 물류 기업은 경쟁력 있는 물류서비스를 제공하기 위해 물류시스템을 개발 및 도입하고 있으며, 특히, IT가 발달하고 모바일 기능이 보다 편리해짐에 따라 모바일 운송관리시스템(Transportation Management System : TMS)이 일반 택배 기사들이나 회사 내 사무직 관리자들도 쉽게 사용할 수 있도록 보다 편리한 시스템으로 도입되고 있다. 그러나 이러한 시스템의 성공여부는 이 시스템 개발자가 현장을 정확히 이해하고 현장에서 그 시스템을 사용하고 있는 사무 관리자와 택배기사들이 능동적으로 그 시스템을 이해하고 적극적으로 이용하는데 달렸다. 본 논문의 목적은 이 시스템을 이용하는 사용자의 태도를 중심으로 새로운 시스템 이용에 있어서 시스템 수용에 어느 특성이 영향을 미치는지를 알기 위함이며 이를 기술수용모델(Technology Acceptance Model : TAM)를 통하여 분석하였다. 분석 결과에 따르면 스마트폰이 대중화된 요즘에는 사용자들이 시스템 수용에 있어 용이성보다 유용성이 유의하다는 결론을 얻었다. 이에 따라 시스템 개발 시 용이성이 아닌 유용성에 중점적으로 관심을 가져야 한다는 시사점을 도출하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제26권4호
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• pp.163-188
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• 2017

Purpose The purpose of this study is to empirically analyze the factors affecting the intention to use the IPA focusing on functional characteristics. Based on the research result, this research has significance in that it not only suggested strategic guidelines for the related business operators, it also helped identify the factors that will influence the intention to use an intelligent personal assistant centering on the functional characteristics of the IPA. Design/methodology/approach Accordingly, in an attempt to identify factors that will influence the intention to use the intelligent personal assistant, we proposed a research model, together with a corresponding hypothesis, which incorporates the functional characteristics (personalization, anthropomorphism, autonomy, communication ability, contextual offer) and perceived enjoyment of the intelligent personal assistant into a technology acceptance model. To verify the research hypothesis of this research, we have conducted a questionnaire survey with individuals who have used an intelligent personal assistant as target. And with the data collected from 215 copies of the questionnaire survey, we have carried out a path analysis using the PLS structural equation. Findings As a result, it turned out that, of the IPA functional characteristics, personalization had a positive effect on perceived usefulness, autonomy had a positive effect on perceived usefulness and perceived ease of use. Also, communication ability had a positive effect on perceived ease of use and perceived enjoyment, and anthropomorphism and contextual offer had a positive effect on perceived ease of use and perceived enjoyment and turned out to be major factors that increased the use intention of intelligent personal assistant.