• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.8
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• pp.3856-3872
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• 2018

HTTP-based adaptive streaming (HAS) has recently been widely deployed on the Internet. In the HAS system, a video content is encoded at multiple bitrates and the encoded video content is segmented into small parts of fixed durations. The HAS client requests a video segment and stores it in the playout buffer. The rate adaptation algorithm employed in HAS clients dynamically determines the video bitrate depending on the time-varying bandwidth. Many studies have shown that an efficient rate adaptation algorithm is critical to ensuring quality-of-experience in HAS systems. However, existing algorithms have problems estimating the network bandwidth because bandwidth estimation is performed on the client-side application stack. Without the help of transport layer protocols, it is difficult to achieve accurate bandwidth estimation due to the inherent segment-based transmission of the HAS. In this paper, we propose an alternative approach that utilizes the playout buffer occupancy rather than using bandwidth estimates obtained from the application layer. We start with a queueing analysis of the playout buffer. Then, we present a buffer-aware rate adaptation algorithm that is solely based on the mean buffer occupancy. Our simulation results show that compared to conventional algorithms, the proposed algorithm achieves very smooth video quality while delivering a similar average video bitrate.

• Journal of Korean Public Health Nursing
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• v.36 no.2
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• pp.212-226
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• 2022

Purpose: The purpose of this study was to explore nurses' experience of the role adaptation process and barriers in long-term care (LTC) facilities including nursing homes, daycare centers, and home visit nursing centers. Methods: After in-depth interviews with 13 nurses who were working at the LTC facilities in G province, the data were analyzed using Colaizzi's phenomenological methodology. Results: 17 themes with 6 theme clusters, and 2 categories emerged: nursing role adaptation process in the LTC (role expectation and readiness, role perception and performance, limits of role performance), and barriers to nursing role adaptation in the LTC facility (organizational, situational, and institutional-environmental barriers). Conclusion: The results showed that it is critical to establish the nurses' role in caring for the health of the elderly and maintaining the quality of care in the LTC facilities. In response to the growing demand for quality care in the LTC facilities, more institutional and environmental changes are needed to address the current barriers that prevent nurses from performing their appropriate roles.

• Korean Journal of Agricultural and Forest Meteorology
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• v.22 no.3
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• pp.194-204
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• 2020

Cultivar parameters, which are key inputs to a crop growth model, have been estimated using observation data in good quality. Observation data with high quality often require considerable labor and cost, which makes it challenging to gather a large quantity of data for calibration of cultivar parameters. Alternatively, data in sufficient quantity can be collected from the reports on the evaluation of cultivars by region although these data are of questionable quality. The objective of our study was to assess the quality of crop and management data available from the reports on the regional adaptation trials for rice cultivars. We also aimed to propose the measures for improvement of the data quality, which would aid reliable estimation of cultivar parameters. DatasetRanker, which is the tool designed for quantitative assessment of the data for parameter calibration, was used to evaluate the quality of the data available from the regional adaptation trials. It was found that these data for rice cultivars were classified into the Silver class, which could be used for validation or calibration of key cultivar parameters. However, those regional adaptation trial data would fall short of the quality for model improvement. Additional information on management, e.g., harvest and irrigation management, can increase the quantitative quality by 10% with the minimum effort and cost. The quality of the data can also be improved through measurements of initial conditions for crop growth simulations such as soil moisture and nutrients. In addition, crop model improvement can be facilitated using crop growth data in time series, which merits further studies on development of approaches for non-destructive methods to monitor the crop growth.

• Korean Journal of Adult Nursing
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• v.24 no.2
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• pp.99-108
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• 2012

Purpose: The study was done to identify factors influencing the quality of life of elderly in non-paid or paid assisted living facilities. Methods: Data were collected by questionnaires from 634 elderly in Seoul and Gyeonggi province. Measures were self-esteem, activities of daily living, depression, family support, health status, facility adaptation, care facility's quality, and quality of life. Data were analyzed using $x^2$-test, independent t-test, ANCOVA, Pearson correlation coefficients, and stepwise multiple regression with SPSS/WIN 15.0 version. Results: The significant factors influencing quality of life of elderly in non-paid assisted living facilities were care facility's quality, depression, self-esteem, family support, education, and activity of daily living, which explained about 40.4% of the variance. The significant factors influencing quality of life of elderly in paid assisted living facilities were activity of daily living, depression, family support, education, care facility's quality, and facility adaptation, which explained about 83.9% of the variance. Conclusion: The results suggest that type of assisted living facilities in developing nursing interventions to improve quality of life of elderly should be considered.

• The Journal of the Korea Contents Association
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• v.15 no.10
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• pp.253-266
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• 2015

The purpose of this study, regarding the effect of the marriage immigrant women's marriage adaptation living in urban and rural areas on their quality of the life, is to analyze whether there are any differences in the moderating effect of support from spouses and families for different areas of residence. This is in order to serve as the preliminary data for preparing intervention strategies that are suited to different areas of residence, so that the quality of life of marriage immigrant women may be improved. This study is a correlational research that targeted 304 marriage immigrant women living in urban and rural areas (148 in urban areas, 156 in rural areas). The study revealed that the support from spouses and families, marriage adaption, and the quality of life were lower in rural than in urban areas and that support from spouses and families, and marriage adaptation had a significant positive correlation for all areas of residence. Also, there was a moderating effect of support from spouses and families in the effect relationship between marriage adaptation and the quality of life. Also, it appeared that this moderating effect was more important in rural than in urban areas. On the basis of the results of this study, we propose that customized intervention strategies for each area of residence be developed so that regardless of the area, migrant women will be able to lead a marriage well and live a fulfilling life.

• Journal of Information Processing Systems
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• v.19 no.6
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• pp.817-829
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• 2023

Variable wireless channel is a big challenge for real-time video applications, and the rate adaptation of realtime video streaming becomes a hot topic. Intra-video coding is important for high-quality video communication and industrial video applications. In this paper, we proposed a novel adaptive scheme for real-time video transmission with intra-only coding over a wireless network. The key idea of this scheme is to estimate the instantaneous remaining capacity of the network to adjust the quality of the next several video frames, which not only can keep low queuing delay and ensure video quality, but also can respond to bandwidth changes quickly. We compare our scheme with three different schemes in the video transmission system. The experimental results show that our scheme has higher bandwidth utilization and faster bandwidth change response, while maintaining low queuing delay.

• Journal of Digital Convergence
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• v.11 no.10
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• pp.351-357
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• 2013

This research studied that the effect of consulting local SMEs focusing on the effective factors related to quality of theoretical study and the previous studies according to research model and research hypotheses. Also, in this empirical analysis, analyzed the consulting performance that distinguish such as consulting procedures quality, consulting adaptation, consultant emotional intelligence and efforts factors. Second, in relationship with consulting adaptation and performance, statistically significant relationship showed weak. Finally, the quality of the consultant engagement and emotional intelligence was analyzed high significance. Therefore, this study further accounting information systems consultant at consultant emotional intelligence factors can expect a useful guidelines.

• Quality Improvement in Health Care
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• v.10 no.2
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• pp.254-265
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• 2003

• Journal of Broadcast Engineering
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• v.24 no.5
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• pp.827-835
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• 2019

In the pooling stage of a full reference image quality assessment (FR-IQA) technique, the global perceived quality for any distorted image is usually measured from the quality of its local image patches. But all the image patches do not have equal contribution when estimating the overall visual quality since the degree of degradation on those patches depends on various considerations i.e., types of the patches, types of the distortions, distortion sensitivities of the patches, saliency score of the patches, etc. As a result, weighted pooling strategy comes into account and different weighting mechanisms are used by the existing FR-IQA methods. This paper performs a thorough analysis and proposes a novel weighting function by considering the luminance adaptation as well as the visual saliency effect to offer more appropriate local weights, which can be adopted in the existing FR-IQA frameworks to improve their prediction accuracy. The extended experimental results show the effectiveness of the proposed weighting function.

• Korean Journal of Childcare and Education
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• v.15 no.2
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• pp.21-36
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• 2019

Objective: The purpose of this study was to analyze the effects of infant temperament on adaptation at childcare centers and the moderated effects of teacher-infant relationships between a vertical transition group and horizontal transition group. Methods: The subjects of the study were 284 infants, aged 1-years-old and 2-years-old, who were hospitalized in childcare centers. To investigate the correlation between variables, Pearson correlation analysis was used. Regression analysis was performed to check the effects of temperament and teacher-infant relationship on childcare adaptation. Results: Infant temperament influenced childcare adaptation in both vertical and horizontal transition groups. The quality of teacher-infant relationships was found to moderate the relationship between infant temperament and childcare adaptation in both groups. Conclusion/Implications: The results of this study, which showed different moderating effects of the teacher-infant relationship in the vertical transfer group and the horizontal transfer group, suggest the need for more diverse studies on the various transition experiences regarding childcare transition.