• 한국임상보건과학회지
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• 제8권1호
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• pp.1362-1368
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• 2020

Purpose. In this study, The change of the accommodation function due to the use of a smartphone was objectively evaluated using an Auto Refractokeratometer and was to investigate the effect of accommodation response and microfluctuations of accommodation on stable fatigue. Methods. Twenty subjects (20 males, 20 females) who had no abnormalities in ophthalmic disease and strabismus, diplopia, suppression, convergence and ocular movement, and corrected visual acuity and unaided visual acuity of 0.8 or more were performed. The average age of the participants is (21.78 ± 1.78) years old. The refractive power of the eye was measured using an Auto Refractokeratometer (Speedy-i K-model, Righton Mfg Co. Tokyo Japan), and the equivalent spherical power was automatically calculated from the measured refractive power. The accommodation response amount was calculated for the accommodation stimulation amount in 8 steps in 0.5D increments from + 0.50D to -3.00D in the calculated equivalent spherical power. The microfluctuations of accommodation in the high frequency region was calculated according to the change in the amount of the accommodation stimulus. At this time, the spectral power of the microfluctuations of accommodation was analyzed by Fast Fourier Transformation (FFT). Results. After using the smartphone, it was found that the accommodation response to accommodation stimulation decreased and the microfluctuations of accommodation increased. Conclusions. It can be said that the use of a smartphone affects the accommodation response and the microfluctuations of accommodation, thereby causing a accommodative stable fatigue. Therefore, it is thought that the use of a smartphone for a long time may bring about a change in the accommodation function.

• 한국안광학회지
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• 제16권1호
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• pp.75-81
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• 2011

목적: 38세 이상 50세 미만의 초기노안자 52명을 대상으로 1차시기(08:00~10:00), 2차시기(13:00~15:00), 3차시기(18:00~20:00)에 걸쳐 조절기능의 일일변화를 조사하였다. 방법: 초기노안자 52명(남 30명, 여 22명)을 근거리 작업량에 따라 4군(I군: ${\geq}$ 7 hrs~IV군: < 3 hrs)으로 분류하여 조절력, 조절용이성, 상대조절력을 검사하였다. 결과: 조절력은 하루 일과 중 근업이 가장 많은 I군에서 가장 낮은 것으로 측정되었고, 단안과 양안의 조절력은 I군~IV군 모두 2차시기의 조절력이 가장 높았다. 조절용이성에서 I군의 단안과 양안, II군의 단안 그리고 III군의 단안과 양안은 2차시기가 가장 높았고, II군의 양안과 IV군의 단안과 양안은 3차시기가 가장 높은 것으로 나타났다. 허성상대조절력은 I군~IV군 모두 1차시기가 가장 높았고, 실성상대조절력의 경우 I~III군은 2차시기가, IV군은 3차시기가 가장 높은 것으로 나타났다. 결론: 작업환경 및 시간은 조절기능에 영향을 줄 수 있으므로 초기노안자의 경우 하루 일과 중 업무 시간대를 고려하여 조절기능에 대한 검사를 하는 것이 안정피로 증상을 해소하는데 도움이 될 것이다.

• 전기학회논문지
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• 제56권10호
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• pp.1844-1851
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• 2007

This paper presents methods for the compensation of sinusoidal disturbances with unknown amplitude, phase, and time-varying frequency in nonlinear systems. In the previous disturbance accommodation methods, the sinusoidal disturbance with unknown time-invariant frequency was considered. In the proposed method, the disturbance with unknown time-varying frequency is compensated. As for the control structure, two control inputs are designed separately in such a way that one of them is designed for the nonlinear system control without considering the disturbance, and the other one uses the disturbance estimate obtained from the disturbance accommodating observer. The stability analysis is done considering the disturbance estimation error and the numerical simulation demonstrates the proposed approach.

• 한국주거학회논문집
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• 제20권4호
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• pp.11-18
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• 2009

Recently the population to enjoy leisure time has increased, due to the advancement of income level and increase of spare time. In the meantime, the growing attention to well-being life has shed light on Han-ok or traditional Korean house. Such a social background as former, the growing number of people prefer staying at Han-ok style accommodation when they are enjoying leisure time. However there has been little substantial study or survey on architectural standards of Han-ok style accommodation because it is a new type of accommodation facility. Therefore this study aims to suggest a set of basic standards on architectural planning for Han-ok style accommodations. For this purpose, it investigated architectural planning on Han-ok style accommodations in Jeollanamdo province through on-site survey and interview to classify them based upon size and scale of the facility, layout of buildings and interior spaces in terms of function, elevation and materials and to find basic standards on architectural planning of Han-ok style accommodations.

• 한국정보시스템학회지:정보시스템연구
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• 제26권3호
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• pp.187-209
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• 2017

Purpose The sharing economy is the most important keyword that is changing the paradigm of the world economy and management, and it was selected as one of 10 ideas to change the world in 2011 in Time magazine. The purpose of this study is to verify the structural relationship between perceived value and risk, network effect, usefulness, trust, and intention to use of accommodation service. In addition, the effects of utility and trust, and the experience of using accommodation service are controlled by the effect of empirical value and reciprocal value among the perceived value of sharing economic service, The purpose of this study is to propose a plan to activate the accommodation sharing service. Design/methodology/approach This study was designed to investigate the structural relationship between perceived value, perceived risk, network effect, usefulness, trust, and intention to use. Empirical analysis was done using SPSS 21.0 and AMOS 21.0 Findings Based on the results of this study, the following conclusions can be drawn. First, it was concluded that the higher the economic value of the accommodation sharing service is, the more useful and reliable the service is. Second, the higher the experiential value of the accommodation sharing service is, the higher the usefulness and reliability of the service are. Third, it was concluded that the higher the value of the mutual benefit of the accommodation sharing service is, the higher the trust level of the service is, but not the usefulness of the service. Fourth, it was concluded that the higher the perceived risk of accommodation sharing service is, the lower the service trust level is, but the service usability is not affected. Fifth, it was concluded that the larger the network effect of the accommodation sharing service is, the more useful the service is, but it does not affect the reliability of the service. Sixth, it was concluded that the higher the overall reliability of the accommodation sharing service is, the higher the usefulness of the service is. Seventh, it was concluded that the higher the overall usefulness and reliability of the accommodation sharing service are, the higher the intention to use the sharing service is. Finally, in order to test the effect of the experience on the use of trust and usefulness of the accommodation sharing service, multiple group analysis was conducted to examine the relationship between trust and usefulness, It is shown that there is a moderating effect in the path.

• 재활복지공학회논문지
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• 제9권3호
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• pp.177-184
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• 2015

본 연구는 장애인 취업자에게 제공된 직무 관련 배려경험이 장애수용과 직무만족, 삶의 만족에 미치는 영향을 알아보고자 하였다. 이를 위해 본 연구에서는 한국장애인고용공단 고용개발원에서 실시한 장애인 고용패널조사를 활용하여 장애인 중 임금을 받고 근로 중인 취업 장애인을 대상으로 하여 직장에서의 배려 경험과 장애수용과 직무만족, 삶의 만족의 수준을 조사하였다. 수집된 자료를 기반으로 빈도분석으로 통해 현재 장애인이 경험하는 적절한 배려의 현황을 알아보고, 분산분석을 통해 배려 경험에 따른 장애수용과 직무만족, 삶의 만족의 차이를 분석하였다. 연구결과를 살펴보면, 여전히 직업 현장에서 장애인 취업자를 위한 적절한 배려나 지원이 이루어지지 못하고 있다는 것이 밝혀졌으며, 직무조정 및 근무시간 조정 관련 배려경험이 장애수용과 직무만족, 삶의 만족에 긍정적 영향을 미치고 있음이 밝혀졌다.

• 한국터널지하공간학회 논문집
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• 제21권1호
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• pp.79-92
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• 2019

본 논문에서는 공동구 도입과 관련하여 초기 기본 계획 단계에서 보다 효율적으로 수용시설물의 설치여부를 결정하기 위한 기법을 제시하였다. 이를 위해 수용시설물의 구성과 종수를 결정하기 위한 평가체계를 정립하였다. 7개의 수용시설물에 대하여 98개의 조합을 분석하였으며, 수용시설물 평가체계를 위하여 타당성 및 경제성과 관련된 지표 중 기본 계획단계와 관련된 지표를 선별하였다. 선별된 항목을 반영하여 공간적, 효과적, 비용적 평가로 분류된 평가체계를 제시하였으며, 가중치 설정을 위한 AHP분석을 실시하였다. 본 연구의 결과는 공동구 설치를 위한 기본 계획 단계에서 설계자를 포함한 사용자들이 공동구내 수용시설물을 결정하는 과정에서 시간을 단축하고 효율성을 높이는데 도움이 될 것으로 판단된다.

• ETRI Journal
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• 제40권3호
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• pp.366-375
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• 2018

Recently, techniques involving head-mounted displays (HMDs) have attracted much attention from academia and industry owing to the increased demand for virtual reality and augmented reality applications. Because HMDs are positioned near to users' eyes, it is important to solve the accommodation-vergence conflict problem to prevent dizziness. Therefore, holography is considered ideal for implementing HMDs. However, within the Nyquist region, the accommodation effect is limited by the space-bandwidth-product of the signal, which is determined by the sampling number of spatial light modulators. In addition, information about the angular spectrum is duplicated over the Fourier domain, and it is necessary to filter out the redundancy. The size of the exit-pupil of the HMD is limited by the Nyquist sampling theory. We newly propose a holographic HMD with an expanded exit-pupil over the Nyquist region by using the time-multiplexing method, and the accommodation effect is enhanced. We realize time-multiplexing by synchronizing a high-speed digital micromirror device and a liquid-crystal shutter array. We also demonstrate the accommodation effect experimentally.

• International Journal of Internet, Broadcasting and Communication
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• 제13권3호
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• pp.1-11
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• 2021

Development of ICT technologies leads exponential growth of various sharing economy over the last couple of years. The intuitive advantage of the sharing economy is efficient utilization of idle goods and services, but there are safety and security concerns. In this paper, we propose a onetime password based access control system to support secure accommodation sharing service and show the implementation results. To provide a secure service to both the provider and the user, the proposed system issues a onetime access password that is valid only during the sharing period reserved by the user, thereafter access returns to the accommodation owner. Especially, our system provides secure user access by merging the two elements of speaker recognition using voice and a one-time password to open and close the door lock. In this paper, we propose a secure system for accommodation sharing services as a use-case, but the proposed system can be applicable to various sharing services utilizing security-sensitive facilities.

• The Journal of Asian Finance, Economics and Business
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• 제10권2호
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• pp.83-90
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• 2023

This study aims to determine the direct effect of positive online reviews, negative online reviews, the usefulness of online reviews, reviewers' expertise, timeliness of online reviews, the volume of online reviews, and comprehensiveness of online reviews on accommodation booking intentions and also the indirect effect of positive online reviews on the intention of booking accommodations through trust as mediation. Research respondents are users of the accommodation booking application in Yogyakarta. Hypothesis testing was carried out using SEM (Partial Least Square). Data was collected by distributing questionnaires to 135 respondents. The results of this study indicate that the Usefulness of Online Reviews, Volume of Online Reviews, and Comprehensiveness of Online Reviews have a direct positive and significant influence on the accommodation booking Intention of booking application users in Yogyakarta. The variables of Negative Online Reviews and Timeliness of Online Reviews have negative and significant influences on the accommodation booking Intention of booking application users in Yogyakarta. Positive Online Reviews and Reviewer Expertise variables are not significant in this study. At the same time, the Trust variable has a full mediation relationship in an indirect relationship between the Positive Online Reviews variables and the accommodation booking Intention of booking application users in Yogyakarta.