• 한국IT서비스학회지
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• 제17권4호
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• pp.163-189
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• 2018

In this study, we analyze the acceptance theories of insurance services using blockchain technology. Although insurance services using block-chain technology are still in discussion, specific development methods for service methods applying block-chain technology in insurance services are being studied. In this study, the following analysis was conducted to analyze the acceptance of insurance services using block chain technology, focusing on four factors of the UTAUT model. As a result of the analysis, the technology benefits of the blockchain affecting the performance expectations of UTAUT are security and reliability. In addition, the factors influencing UTAUT's effort expectations were found to be availability and economics. Therefore, it was found that performance expectation and effort expectation for technology acceptance are influenced by different technology benefits. Among the four factors of UTAUT, the factors affecting the insurance service using the blockchain technology are performance expectation and effort expectation, and social influence and promotion condition have no effect on acceptance intention. Also, the moderating effect of user innovation on acceptance intention of insurance service applying blockchain was significant only for effort expectation among UTAUT factors.

• 한국의류산업학회지
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• 제14권1호
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• pp.24-36
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• 2012

This study examines consumer's acceptance intention of sensor-based smart clothing empolying the extended TAM. Technology innovativeness, information innovativeness and trust were used as external variables and perceived palyfulness was included in the extetended TAM. Data were collected from the adults over 20 years old living in Daegu from March 14 to 18, 2011. 193 useful copies of data were analyzed to investigate a structural model and test research hypotheses using AMOS 7.0. The study results showed that the extended TAM for smart clothing was validated empirically in predicting the individual's acceptance of sensor-based smart clothing and 10 hypotheses among 12 hypotheses were supported. Technology innovation, information innovation, and trust were confirmed as antecedent variables in affecting extended TAM. Perceived usefulness and perceived playfulness directly influenced acceptance intention and indirectly influenced acceptance intention mediating attitude. Perceived usefulness affected perceived playfulness and attitude affected acceptance intention. This study will help marketers and managers of fashion companies devise effective tools in planning marketing strategies related to smart clothing.

• International Journal of Fluid Machinery and Systems
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• 제10권2호
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• pp.164-175
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• 2017

Francis turbines are often operated over a wide load range due to high flexibility in electricity demand and penetration of other renewable energies. This has raised significant concerns about the existing designing criteria. Hydraulic turbines are not designed to withstand large dynamic pressure loadings on the stationary and rotating parts during such conditions. Previous investigations on transient operating conditions of turbine were mainly focused on the pressure fluctuations due to the rotor-stator interaction. This study characterizes the synchronous and asynchronous pressure and velocity fluctuations due to rotor-stator interaction and rotating vortex rope during load variation, i.e. best efficiency point to part load and vice versa. The measurements were performed on the Francis-99 test case. The repeatability of the measurements was estimated by providing similar movement to guide vanes twenty times for both load rejection and load acceptance operations. Synchronized two dimensional particle image velocimetry and pressure measurements were performed to investigate the dominant frequencies of fluctuations, vortex rope formation, and modes (rotating and plunging) of the rotating vortex rope. The time of appearance and disappearance of rotating and plunging modes of vortex rope was investigated simultaneously in the pressure and velocity data. The asynchronous mode was observed to dominate over the synchronous mode in both velocity and pressure measurements.

• 한국게임학회 논문지
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• 제19권5호
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• pp.115-132
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• 2019

본 연구는 기술수용모델을 이용하여 VR콘텐츠의 지각된 재미가 재이용 의도에 미치는 요인을 분석하였다. 지각된 재미의 요인은 콘텐츠 품질, VR특성, 감정적 특성, 몰입 네 가지로 설정하여 검증하였으며, 연구 결과 VR특성, 감정적 특성, 몰입은 지각된 재미에 긍정적 영향을 주지만, 콘텐츠의 고품질 요인은 지각된 재미에 영향을 미치지 않는다는 사실이 입증되었다. 또한 지각된 재미, 지각된 유용성, 지각된 용이성 모두는 재이용 의도에 영향을 미치고 있는 것으로 나타났으며, 콘텐츠의 지각된 재미가 지각된 유용성에 긍정적인 영향을 미치는 것으로 분석되었다.

• 한국식품영양학회지
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• 제31권1호
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• pp.185-194
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• 2018

The purpose of this study was to investigate the structural relationship between environmental factors, personal factors, ease of use, usefulness and behavioral intention of delivery application by applying the extended Technology Acceptance Model (TAM). An online survey was conducted based on a self-administered questionnaire to a selected sample who had an experience of using delivery application at least once. The survey was conducted in September, 2017. The data obtained was analyzed using SPSS 24.0 for windows and AMOS 24.0. The findings of the study showed that among environmental factors, social influence had a significant effect on perceived usefulness and perceived ease of use and facilitating conditions had a significant effect on perceived ease of use only. Among personal factors, anxiety had a significant effect on perceived usefulness, while innovation had a significant effect on perceived ease of use. Both of perceived usefulness and perceived ease of use had a significant effect on behavioral intention. This study suggests the importance of environmental and personal factors for increase of behavioral intention of delivery application.

• 기술혁신연구
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• 제20권3호
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• pp.129-151
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• 2012

이 글은 사회문제 해결형 인문사회-과학기술 융합연구의 특성을 정리하고 그것을 활성화하기 위한 방안을 다룬다. 먼저 현재 이루어지고 있는 사회문제 해결형 인문사회-과학기술 융합연구의 사례를 살펴볼 것이다. 복잡한 사회문제를 해결하기 위한 인문사회-과학기술 융합연구 사례와 기술이 가져올 수 있는 사회적 문제를 사전적으로 성찰하고 개선하기 위한 연구를 검토할 것이다. 이어서 사회문제 해결형 융합연구를 범주화하기 위한 틀로서 <2유형>(Mode 2) 연구를 제시하고 이를 바탕으로 사회문제 해결형 인문사회-과학기술 융합연구의 특성을 살펴본다. 이 특성을 기준으로 사회문제 해결형 인문사회-과학기술 융합연구의 역할과 발전방향을 모색한다.

• Nuclear Engineering and Technology
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• 제47권6호
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• pp.766-775
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• 2015

The integrity assessment of reactor vessel internals should be conducted in the design process to secure the safety of nuclear power plants. Various loads such as self-weight, seismic load, flow-induced load, and preload are applied to the internals. Therefore, the American Society of Mechanical Engineers (ASME) Code, Section III, defines the stress limit for reactor vessel internals. The present study focused on structural response analyses of the upper guide structure upper flange. The distributions of the stress intensity in the flange body were analyzed under various design load cases during normal operation. The allowable stress intensities along the expected sections of stress concentration were derived from the results of the finite element analysis for evaluating the structural integrity of the flange design. Furthermore, seismic analyses of the upper flange were performed to identify dynamic behavior with respect to the seismic and impact input. The mode superposition and full transient methods were used to perform time-history analyses, and the displacement at the lower end of the flange was obtained. The effect of the damping ratio on the response of the flange was also evaluated, and the acceleration was obtained. The results of elastic and seismic analyses in this study will be used as basic information to judge whether a flange design meets the acceptance criteria.

• 한국통신학회논문지
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• 제32권2A호
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• pp.152-161
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• 2007

IEEE 802.11 Wireless Local Area Networks (WLANs)는 광대역 무선 인터넷 접속기술로 널리 이용되고 있으며 WLAN을 기반으로 하는 음성 서비스(VoWLAN)와 같은 새로운 응용들이 등장하고 있다. VoWLAN서비스들은 휴대형 장치를 통해 서비스가 되며 베터리 전력을 이용해서 동작하는 휴대형 장치들을 위해 사용 전력을 최소화하여 대기시간을 최대화하는 기술이 필수적이다. 그러나 IEEE 802.11 WLAN 규격은 VoWLAN 서비스와 관련하여 사용 전력을 최적으로 이용하는 동작을 지원하지 않는다. 본 논문에서 페이징, idle 핸드오프 및 지연 핸드오프로 구성되는 새로운 Idle Mode operation을 제안한다. Idle mode operation를 기반으로 동작하는 모바일 호스트는 미리 정의되어 있는 페이징 영역내에서는 핸드오프를 하지 않는다. 모바일 호스트가 새로운 페이징 영역으로 진입할 때에만 최소한의 호처리 신호를 발생시키는 idle 핸드오프를 수행한다. 기존의 IEEE 802.11 WLAN은 idle mode를 지원하지 않기 때문에 Power Saving Mode (PSM)과 IP paging 기법을 동시에 이용해 왔으나 전력소비 효율이 좋지 못하였다. 본 논문은 구현을 통하여 새롭게 제안한 방식인 idle mode operation이 실현가능 함을 증명하고 기존의 방식과 비교하여 전력소비 효율이 더 뛰어남을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권8호
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• pp.3701-3727
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• 2016

Recently Service Function Chaining (SFC) is promising to innovate the network service mode in modern networks. However, a feasible implementation of SFC is still difficult due to the need to achieve functional equivalence with traditional modes without sacrificing performance or increasing network complexity. In this paper, we present a configurable network service chaining (CNSC) mechanism to provide services for network traffics in a flexible and optimal way. Firstly, we formulate the problem of network service chaining and design an effective service chain construction framework based on integrating software-defined networking (SDN) with network functions virtualization (NFV). Then, we model the service path computation problem as an integer liner optimization problem and propose an algorithm named SPCM to cooperatively combine service function instances with a network utility maximum policy. In the procedure of SPCM, we achieve the service node mapping by defining a service capacity matrix for substrate nodes, and work out the optimal link mapping policies with segment routing. Finally, the simulation results indicate that the average request acceptance ratio and resources utilization ratio can reach above 85% and 75% by our SPCM algorithm, respectively. Upon the prototype system, it is demonstrated that CNSC outperforms other approaches and can provide flexible and scalable network services.

• 한국콘텐츠학회논문지
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• 제9권9호
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• pp.411-422
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• 2009

본 연구의 목적은 모바일관광정보서비스 사용자의 사용 의도에 직접적인 영향을 미치는 요인을 탐색하여, 요인간 연관관계를 제시하는 것이다. 본 연구는 기존의 모바일관광정보에 관련된 연구와 Davis의 기술수용모델(TAM)을 고찰하였으며, 선행연구를 바탕으로 모바일관광정보서비스 특성인 정확성, 상호작용성, 지각된 유용성, 지각된 용이성, 주변상황인식성, 편재접속성을 추출하고 연구모델을 설정하였다. 그리고 이 요인들이 만족도 및 재사용의도에 어떠한 영향을 미치는지 모바일 관광정보서비스 사용 경험이 있는 실제 사용자들을 대상으로 실증 분석을 수행하였다. 구조방정식을 이용하여 연구한 결과 상호작용성, 주변상황인식성, 지각된 유용성, 지각된 용이성이 만족도에 긍정적인 영향을 나타났다. 특히 상호작용성과 주변상황인식성은 만족도와 재사용의도에 중요한 요인으로 검증되었다. 따라서 주변상황인식성과 상호작용성을 높여야 할 것이며, 정확성과 편재접속성을 높이는 것보다는 지각된 유용성과 지각된 용이성을 높이는 것을 제안한다. 본 연구는 모바일 관광정보서비스의 활성화에 응용하거나 산업 정책적 가이드라인을 제시하는데 실증적인 지표로 활용되길 기대해 한다.