• Journal of Communications and Networks
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• 제16권2호
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• pp.121-129
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• 2014

The trend of an increasing demand for a high-quality user experience, coupled with a shortage of radio resources, has necessitated more advanced wireless techniques to cooperatively achieve the required quality-of-experience enhancement. In this study, we investigate the critical problem of rate splitting in heterogeneous cellular networks, where concurrent transmission, for instance, the coordinated multipoint transmission and reception of LTE-A systems, shows promise for improvement of network-wide capacity and the user experience. Unlike most current studies, which only deal with spectral efficiency enhancement, we implement an optimal rate splitting strategy to improve both spectral efficiency and energy efficiency by exploring and exploiting cooperation diversity. First, we introduce the motivation for our proposed algorithm, and then employ the typical cooperative bargaining game to formulate the problem. Next, we derive the best response function by analyzing the dual problem of the defined primal problem. The existence and uniqueness of the proposed cooperative bargaining equilibrium are proved, and more importantly, a distributed algorithm is designed to approach the optimal unique solution under mild conditions. Finally, numerical results show a performance improvement for our proposed distributed cooperative rate splitting algorithm.

• 한국IT서비스학회지
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• 제11권1호
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• pp.1-14
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• 2012

The Web accessibility compliance rate of public organizations and private enterprises is still low due to the lack of awareness of Web accessibility by website developers and managers in spite of the fact that web accessibility compliance became mandatory in 2008. Web developers and managers think the website visual quality might be compromised or the website requires more development time and budget in order to comply with the web accessibility guidelines. Therefore, this paper has analyzed whether developers with various training in web accessibility or experience on website development have different perception on time, cost and design issues for developing accessible websites. For this purpose, 72 Web developers with hand-on experience working for website development companies in Korea were sent to the questionaries. The results have indicated that the group of developers with many hours of training in web accessibility and rich experience on website development perceives that they can develop accessible website without additional cost and time or compromising design quality. The contributions of this paper are following： (1) proving the widely recognized perception on budget, time, and design for developing accessible website is incorrect and (2) motivating further research on this subject in the future.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권10호
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• pp.3831-3851
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• 2015

This paper is concerned with the problem of joint resource allocation and user-pairing in virtual MIMO SC-FDMA systems to improve service quality of experience (QoE). No-reference logarithmic model is introduced to quantify service experience for each user and the objective is to maximize sum of all user's mean of score (MOS). We firstly formulate the optimal problem into an S-dimensional (S-D) assignment problem. Then, to solve this problem, the modified Lagrangian relaxation algorithm is deduced to obtain the suboptimal result of joint user-paring and subchannel allocation. The merits of this solution are as follows. First, the gap between its results and the global optimal one can be quantified and controlled by balancing the complexity and accuracy, which merit the other suboptimal algorithms do not have. Secondly, it has the polynomial computational complexity and the worst case complexity is O(3LN³), where L is the maximum iteration time and N is the number of subchannels. Simulations also prove that our proposed algorithm can effectively improve quality of experience and the gap between our proposed and the optimal algorithms can be controlled below 8%.

• 보건행정학회지
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• 제25권3호
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• pp.229-239
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• 2015

Background: The hospital accreditation program in Korea has been conducted since 2011 in order to improve patient safety and healthcare service quality. This study was conducted to find factors associated with satisfaction as surveyor and reliability of surveyors in hospital accreditation program. Methods: This study was performed targeting 217 responded to the survey among 412 surveyors who had participated in the accreditation survey for acute care hospitals from December 2010 to February 2014. Results: The average number of survey per surveyor is 2.35. We divided surveyors into those who participated in the survey more than 3 times and less than 3 times in order to judge the professionalism of surveyors according to the number of survey participation. Those factors that have an influence on the satisfaction as surveyors include: activity period as surveyor, role in the survey team, experience of survey in other fields, experience as consultant and the useful education and proper composition of survey team (p<0.05). Those factors that have an influence on the reliability for fellow surveyors include: number of beds of hospitals they belong, experience of survey in other fields, useful education, proper composition of survey team and difficulty in leadership interview (p<0.05). Conclusion: It is important to provide useful education and proper composition of survey team to increase the satisfaction as surveyors and the reliability for fellow surveyors.

• 보건의료산업학회지
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• 제12권3호
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• pp.1-11
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• 2018

Objectives: The purpose of this study is to evaluate patient experience assessment of inpatients, and to prepare measures to improve the quality level of medical services and guarante patient rights. Methods: The study was conducted among 199 patients admitted to hospitals and general hospitals in the metropolitan area. The analysis method used was crossover analysis, including a comparison of means, and logistic regression analysis. Results: The overall average score of satisfaction with healthcare service was 3.39 for nurses, 3.35 for hospitals and 3.42 for general hospitals. Age at the time of hospitalization affected satisfaction. The overall average score of healthcare service satisfaction was 3.09 for doctors, 3.14 for hospitals, and 3.04 for general hospitals. The factors affecting hospital satisfaction were gender and subjective health status. The factors affecting satisfaction in general hospitals were education, medical department, and hospitalization route. Conclusions: Hospitals should also introduce a systematic management system of general hospitals and strengthen the guarantee of the rights of patients who can improve the quality of medical care through positive communication between medical personnel and patients.

• 한국컴퓨터정보학회논문지
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• 제27권12호
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• pp.101-110
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• 2022

본 연구는 <우연히 웨스 엔더슨(Accidentally Wes Anderson, 이하 AWA)> 전시의 인스타그래머블 특성과 관람 경험을 실증적으로 접근하기 위해 경험 품질, 인지된 가치, 이용 태도, 지속적 행동적 이용 의사 등의 변인을 중심으로 연구 모형과 가설을 설정했다. 인지된 가치의 관점에서 상기 전시의 인스타그래머블적 특성은 강했지만, 경험 품질 측면에서 전시는 유희적이기 보다는 심미적이거나 치유적 특성이 높게 나타났다. 상술한 인지된 가치는 전시만족도 및 전시몰입도와 상관관계를 가졌지만, 행동적 이용의사에는 영향을 미치지 못했다. 또한 전시만족도는 전시몰입도, 관람소요시간, 인스타그램에 사진 게시 및 공유 의사의 증가에 긍정적인 영향을 미쳤다.

• 한국보건간호학회지
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• 제23권2호
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• pp.262-272
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• 2009

Objectives: This study sought to provide basic data for the establishment of a desirable sense of ethics in medical service by analyzing the consciousness of biomedical ethics of nursing students. Methods: Subjects were nursing students selected from four-year and three-year nursing colleges (n=355 and 360, respectively) in D city and G buk-Do region. The Data was analyzed using t-test, one-way ANOVA, and multiple regression. Results: The average point of the consciousness of biomedical ethics was 2.99. As result of analyzing general and specific aspects of the consciousness of biomedical ethics, statistically significant differences were found in age, religion, participation in religious activity, kinds of student group activity in subjects, ethical values, experience of hearing for biomedical ethics, quantity and quality of biomedical ethics in the current curriculum, the experience of conflict for biomedical ethical problem in subjects. The predicting variables that influence the consciousness of biomedical ethics, ethical values, quantity and quality of biomedical ethics in the current curriculum, religion, age, and experience of hearing for biomedical ethics. Conclusions: An arbitration program that could promote either changeable or controllable ethical values must be considered with attention to the significant variables that can promote the consciousness of biomedical ethics of nursing students.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권11호
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• pp.3030-3049
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• 2023

With the development and wide application of hybrid network computing modes like cloud computing, edge computing and fog computing, the customer service requests and the collaborative optimization of various computing resources face huge challenges. Considering the characteristics of network environment resources, the optimized deployment of service resources is a feasible solution. So, in this paper, the optimal goals for deploying service resources are customer experience and service cost. The focus is on the system impact of deploying services on load, fault tolerance, service cost, and quality of service (QoS). Therefore, the alternate node filtering algorithm (ANF) and the adjustment factor of cost matrix are proposed in this paper to enhance the system service performance without changing the minimum total service cost, and corresponding theoretical proof has been provided. In addition, for improving the fault tolerance of system, the alternate node preference factor and algorithm (ANP) are presented, which can effectively reduce the probability of data copy loss, based on which an improved cost-efficient replica deployment strategy named ICERD is given. Finally, by simulating the random occurrence of cloud node failures in the experiments and comparing the ICERD strategy with representative strategies, it has been validated that the ICERD strategy proposed in this paper not only effectively reduces customer access latency, meets customers' QoS requests, and improves system service quality, but also maintains the load balancing of the entire system, reduces service cost, enhances system fault tolerance, which further confirm the effectiveness and reliability of the ICERD strategy.

• 기술혁신학회지
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• 제21권1호
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• pp.265-299
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• 2018

특허 소송은 혁신 혹은 지적 재산권의 보호 수단으로서 알려져 있다. 그러나 특허 시장이 증대됨에 따라 경쟁사의 진입을 방해하기 위한 전략적 수단으로 특허 소송의 활용 범위가 증대되었다. 특허 소송에 연루될 가능성은 기업이 가지고 있는 특허의 양질이 증대할수록 높아진다고 밝혀져 왔다. 그러므로 혁신을 추구하는 기업의 입장에서는 특허 소송에 연루될 가능성을 최대한 낮출 수 있는 방안이 필요하다. 이에 본 연구는 인쇄 전자 산업 내 기업의 과거 제휴 활동이 특허품질과 특허 소송의 관계에 미칠 수 있는 영향력에 대해 분석하였다. 특허 품질과 특허 소송의 관계에 대한 기존 연구결과를 재 입증함과 더불어 피고인 관점의 특허 소송에 대한 연구를 진행하여 기업의 제휴 활동이 특허 소송을 낮춘다는 결과를 도출하였다. 예컨대, 평균치의 특허를 지닌 기업에 대해 과거 제휴 활동의 유무가 연간 특허 소송률을 약 33% 낮추는 것을 실증적으로 입증하였다. 본 연구가 특허 소송과 전략적 제휴에 관한 기존 문헌에 기여하는 바는 다음과 같다. 기업의 과거 전략적 제휴가 평판으로서의 역할을 하여 특허 소송을 감소시킴을 확인함으로써 기존 전략적 제휴 관련 문헌에 기여한다. 또한, 특허 품질이 특허 소송에 미치는 영향력에 대한 새로운 조절 변수를 밝혀냄으로써 기존 특허 소송 관련 문헌에 기여한다. 더불어, 본 연구는 특허 소송을 피고인 관점에서 분석한 최초의 연구라는 점에서 매우 의미가 있다.

• 한국전자거래학회지
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• 제26권2호
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• pp.95-122
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• 2021

최근 COVID-19 팬데믹으로 비대면 사회가 되면서 가상현실(VR) 기반으로 문화유산을 체험하려는 시도가 이어지고 있다. 그러나 VR 콘텐츠 체험이 실제 문화유산이 있는 관광지에 대한 방문으로까지 이어지는지, VR 콘텐츠 체험 만족으로 인해 관광지 방문 의도가 감소하지는 않는지에 대한 의문이 제기되고 있다. 이에 본 연구의 목적은 VR 기반 문화유산 체험이 유적지 방문 의도에 어떤 영향을 주는지를 실증적으로 파악하는 것이다. 또한, VR 기반 문화유산 체험이 Web 기반 문화유산 체험에 비하여 가지는 특징을 파악하고자 한다. 이를 위해 DeLone and McLean이 제안한 정보시스템 성공모델을 기반으로, 관광 콘텐츠 체험이 유적지 방문의도에 어떤 영향을 미치는지 살펴보았다. 더 나아가 콘텐츠 체험형태(VR vs. Web)에 따른 구조적 관계에 차이가 있는지 살펴보았다. 연구결과, VR 기반 콘텐츠 체험 시에 시스템 품질의 편리성과 정보 품질의 실재감, 유용성은 만족도에 정(+)의 영향을 미치는 것으로, 정보품질의 실재감과 만족도는 지속사용의도에 정(+)의 영향을 미치는 것으로 나타났다. 또한, 지속사용의도는 방문의도에 정(+)의 영향을 미치는 것으로 나타난 반면에 만족도는 방문의도에 통계적으로 유의한 영향을 미치지 않는 것으로 나타났다. 한편, Web을 통해 콘텐츠를 체험한 집단이 VR을 통해 콘텐츠를 체험한 집단보다 정보 품질의 유용성이 지속사용의도에 미치는 영향력의 크기가 더 큰 것으로 나타났다. 본 연구결과를 토대로 관광지에 대한 방문의도를 높이기 위한 VR 기반 관광 콘텐츠를 구성하는 방안에 대해 논의하였다.