• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.11
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• pp.3008-3025
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• 2012

In this paper, the downlink resource allocation of OFDMA system with decode-and-forward (DF) relaying is investigated. A non-convex optimization problem maximizing system throughput with users' satisfaction constraints is formulated with joint relay selection, subcarrier assignment and power allocation. We first transform it to a standard convex problem and then solve it by dual decomposition. In particular, an Optimal resource allocation scheme With Time-sharing (OWT) is proposed with combination of relay selection, subcarrier allocation and power control. Due to its poor adaption to the fast-varying environment, an improved version with subcarrier Monopolization (OWM) is put forward, whose performance promotes about 20% compared with that of OWT in the fast-varying vehicular environment. In fact, OWM is the special case of OWT with binary time-sharing factor and OWT can be seen as the tight upper bound of the OWM. To the best of our knowledge, such algorithms and their relation have not been accurately investigated in cooperative OFDMA networks in the literature. Simulation results show that both the system throughput and the users' satisfaction of the proposed algorithms outperform the traditional ones.

• Journal of Engineering Education Research
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• v.25 no.1
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• pp.22-32
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• 2022

The purpose of this study is to design and operate non-face-to-face online practice class in engineering education, and to explore students' perceptions and effectiveness of them. To this end, after developing and implementing a strategy for non-face-to-face online practice activities in the 'Introduction to Electric Circuits and Lab' course, the questionnaire responses of 47 learners were analyzed, and the group differences were investigated using Kruskal-Wallis test. As a result, it was found that students' perceptions of non-face-to-face online practice class were positive in terms of learning effect, learning convenience, interaction, and satisfaction. The group difference according to the face-to-face/non-face-to-face preference method was found to be higher in the group that preferred non-face-to-face class in terms of learning convenience, interaction and satisfaction. As for the group difference according to the number of questions and answers of the learners, the group who answered the question showed a higher awareness of the learning convenience and interaction than the group that did not. In addition, implications for designing a learning environment for non-face-to-face online practice classes were presented.

• Journal of muscle and joint health
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• v.24 no.2
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• pp.89-100
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• 2017

Purpose: The aim of this study was to examine the utilization of and satisfaction with the smart bedside station (SBS) system among users in a hospital. Methods: A cross-sectional descriptive design was used. The participants were 190 patients, 186 family caregivers, and 154 nurses in a hospital. Results: Around 78.1% of patients or family caregivers used the SBS system at least once during their hospital stay. The commonly used items on the SBS system menu were "lab findings", "hospital cost", "today's medication", and the "alarm message". Satisfaction with the SBS system of patients and family caregivers were significantly higher than those of nurses (F=39.88, p<.001). Conclusion: A patient-centered SBS system was a useful system that could increase patient satisfaction and comfort. More specific and technical service contents reflecting the current healthcare system should be added.

• Physical Therapy Rehabilitation Science
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• v.11 no.4
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• pp.598-603
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• 2022

Objective: About one-third of college students are exposed to stress to the point that their academic performance is negatively affected. To provide useful information for managing the mental health of young people by analyzing the perceived stress level, depression level, and life satisfaction according to the amount of physical activity and the level of muscular strength in male college students. Design: A cross-sectional study. Methods: Among 304 students who participated in the health exercise class at Sahmyook University in Seoul, the amount of physical activity and the level of muscular strength were divided into 3 quartiles, respectively, and the perceived stress level, depression level, and life satisfaction were analyzed through one-way ANOVA. The physical activity level and muscle strength level of the subjects were ranked, divided into 3 groups, and the difference in variables according to the group was verified. Results: There was no difference in perceived stress level, depression level, and life satisfaction according to the amount of physical activity, but statistically significant differences were shown in perceived stress scale(p=0.008) and life satisfaction(p=0.030) according to muscular strength. Conclusions: Policies to increase physical activity are important to improve and manage the mental health of young people, but it is judged to be more meaningful to provide an environment that can improve muscular strength.

• Mood & Emotion
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• v.15 no.2
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• pp.67-72
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• 2017

Objectives : Mindfulness meditation has recently become a major component in mainstream modern cognitive behavioral therapy. The purpose of this study was to examine effects of a mindfulness meditation program on positive resources of outpatients with depressive disorder and anxiety disorder. Methods : Participants were 55 psychiatric clinic outpatients. Participants received eight weekly sessions in a mindfulness meditation training program, that was approximately 90 minutes each. Measures included the Positive Resources Test (POREST), Acceptance and Action Questionnaire-16 (AAQ-16), Life Satisfaction Expectancy Scales (LSES), and Subjective Happiness Scale (SHS). Variables were measured at two time points : pre- and post-implementation (eight weeks later). Results : Paired t-test results of participants before and after the mindfulness meditation program revealed statistically significant improvement in positive resources (t=-5.847, p<.001), acceptance (t=-4.090, p<.001), life satisfaction expectancy (t=-3.892, p<.001), but not in subjective happiness. Conclusion : Results suggest mindfulness meditation may be effective to enhance positive resources, acceptance, and life satisfaction in outpatients with depressive disorder and anxiety disorder. Mindfulness meditation may be a factor in improving psychological well-being and positive psychological features in outpatients with depressive disorder and anxiety disorder.

• Journal of Korean society of Dental Hygiene
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• v.6 no.3
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• pp.187-201
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• 2006

The purpose of this study is to examine the satisfaction for college life and oral prophylaxis subject and improve the satisfaction for this subject by satisfying students' desire through the results of correlation, and to inspire a professional sense by helping students enjoy healthy college life. In order to achieve these purposes, 127 senior students of the Dental Hygiene Department, Kwangju Health College took part in this study to examine the satisfaction for a study course, a lab, professors, a college, and subjects. The following results were obtained. 1. The overall satisfaction for the Dental Hygiene Department was 2.83 and the highest dissatisfaction factors included difficult subjects and non-aptitude. The overall satisfaction for professors was 3.33 and students wanted professors' human contact with students and a well-prepared lecture. The overall satisfaction for college life was 2.65, suggesting not very high satisfaction, and the highest dissatisfaction factors included similar life to high school and surrounding environment. 2. The overall satisfaction for theory was 3.83 and for practice was 3.91 in oral prophylaxis. While the highest satisfaction was found in 'the objective and direction of class' and 'class and a supplementary lesson in not giving a lecture', the lowest satisfaction was found in 'experience in reading textbook-related materials or books'. 3. The correlation of the satisfaction of theory and practice of oral prophylaxis was examined. The satisfaction of oral prophylaxis theory was positively correlated with a school course, professors, and college, while the satisfaction of oral prophylaxis practice was positively correlated with a school course, professors, college, satisfaction of oral prophylaxis theory, and present health condition(p<0.05). 4. Factors influencing the satisfaction for the theory of oral prophylaxis included professors, while factors influencing the satisfaction for the practice were statistically significant in professors and health condition(p<0.05). Based on these results, in order for professional dental hygienists to be developed as professionals serving society, it is recommended to enhance the satisfaction for an oral prophylaxis subject and that professors should provide warm-hearted support and become a role model as an educator.

• Journal of the Ergonomics Society of Korea
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• v.26 no.3
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• pp.67-80
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• 2007

Digital convergence, defined as the creative fusion of once-independent technologies and service, is getting more attention recently. Interruptions among internal functions happen frequently in digital convergence products because many functions that were in separate products are merged into a single product. Multi-tasking and multi-modality are two distinctive features of interruption in digital convergence products, but their impacts to the user have not been investigated yet. This study conducted a controlled experiment to investigate the impacts of multi-tasking and multi-modality on the subjective satisfaction and objective performance of digital convergent products. The study results indicate that multi-tasking and multi-modality have substantial effects individually as well as together. The paper ends with practical and theoretical implications of study results as well as research limits and future research.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.995-1000
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• 2003

This paper proposes the pedestrian navigation system which deals with subjective information. This system consists of the route setting part and the instruction generation part. The route setting part chooses the route with highest subjective satisfaction degree. The instruction generation part gives users the instructions based on the users' sensuous feeling of distance with linguistic expressions. Fuzzy measures and integrals are applied to the calculation of the satisfaction degree of the route which reflects the users' taste for routes. The instruction generation part has database of users' cognitive distance. Users' cognitive distances are expressed by fuzzy sets that correspond to linguistic terms. The system generates the instructions with linguistic terms which have the highest fitness value for the users' sensuous feeling of distance. This paper also performs subjective experiments in order to confirm the validity of the present system.

• Journal of the Korean Operations Research and Management Science Society
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• v.23 no.4
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• pp.171-186
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• 1998

While one main stream of research in GDSS (Group Decision Support System) is to investigate how GDSS affects decision-making performances of groups according to task types, support features, meeting facilitation modes and meeting environments. little study h3s been done about how group characteristics affect group decision processes and outcomes depending upon GDSS is provided or not. So far, most GDSS research has considered group characteristics (e.g. personality homogeneity) as given and did not include it as control variables in experiments. Therefore, the objective of this study is to investigate how members of two different groups perceive the use of GDSS in group meetings through lab experiments. The two groups are homogeneous and heterogeneous groups in terms of members' personality mix. This research found that the effect of GDSS is a function of groups' personality homogeneity in regards of the satisfaction on decision process and the communication thoroughness. The support of GDSS and the group homogeneity are proved to influence participant's perception about some dependent variables such as satisfaction on decision process.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.320-325
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• 2003

This study investigates empirically the job satisfaction and turnover awareness of the R&D manpower working in company research laboratory. Through the analysis of 106 questionnaires and individual depth interview with R&D manpower who is evaluated as cove researcher in research lab., this study obtains the practical informations on the understandings of their workplace and the extend of turnover awareness etc. The result shows that the many researchers have turnover-minded to improve job stability and develop their career. They think themselves as a cove competent person, but their performances aye not recognised by the organization as they expected level. And the result indicates that many of them haven't find their visions in the workplace.