• The Journal of the Korea Contents Association
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• v.18 no.3
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• pp.34-40
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• 2018

In this study, the optimal buffer size is calculated for seamless video playback on a mobile device. Buffer means the memory space for multimedia packet which arrives in mobile device for video play such as VOD service. If the buffer size is too large, latency time before video playback can be longer. However, if it is too short, playback service can be paused because of shortage of packets arrived. Hence, the optimal buffer size insures QoS of video playback on mobile devices. We model the process of buffering into a discret-time queueing model. Mean busy period length and mean waiting time of Geo/G/1 queue with N-policy is analyzed. After then, we uses the main performance measures to present numerical examples to decide the optimal buffer size on mobile devices. Our results enhance the user satisfaction by insuring the seamless playback and minimizing the initial delay time in VOD streaming process.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2004.11a
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• pp.413-417
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• 2004

The important goal of urban renewal is not to reform only Physical environment but to improve people' life quality. people who have been lived in urban renewal area are grouped to owner and tenant. owner of land or house has substituent right but tenant has only house-moving money or rental house by urban renewal. But rental house condition is not good to tenant because tenant has large family, low-income and low grade and it is essential to provide rental house for low-income class and it is worth to analyze tenant house problem The purpose of this study is to analyze the problems of public rental house and to presents solutions. The study was done in following process. First, the literatures on this subject were investigated to seek the problems of public rental house. Second, Survey were done on the staff, who works in the cooperative housing redevelopment and whose jobs are officer, consultant, real estate introducer and designer, to seek problems and solution of public rntal house. survey which is made by three group. one group is made by people who already lived in tenant APT, second group is made by people who are waiting for moving in tenant APT. Third group is made by specialist who has many experience-more than 3years- to urban renewal. Third, the Correlation Analysis was used to analyze the relation between the Area and dwelling satisfaction. Fourth, tenant policy' altenative is presented to solve tenant APT' problem which is analyzed by this study The results are as follows : First, tenant APT' size Which is regulated to 30-$45m^{2}$ is enlarged to more than $45m^{2}$ because tenant family is made up averagely of 4.8 persons. Second, tenant APT' rental cost is reduced to 100 thousand won. Third tenant APT' arrangement is divided from owner because tenant and owner want to live in group by group. Fourth, tenant house type is changed to various house type because tenant is not familiar with APT

• Journal of the Korean housing association
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• v.19 no.2
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• pp.1-10
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• 2008

The purpose of this research is to compare residents' movement and activities in SH apartment in Yangcheon-Gu, Seoul (SH apartment) and PHA apartment in St. Paul, Minnesota (PHA apartment) in order to improve the quality of rental housing environment. This study had surveyed 418 residents of SH apartments in Korea and used the secondary data gathered from 1,462 residents of PHA apartments in the United States. The results of this study are as follows: The criteria of Korean residents in SH apartments when choosing their residences are lower rent payment and shorter waiting time. They seemed to have no other options than public rental housing. On the contrary, American residents in PHA apartment had more option to choose from. Therefore, Korea needs to offer more variety types of residents that can be lead to better satisfaction of low income classes. Most of the SH apartments residents has lived for long-term, in the average of more than 6 years, and wanted to live continually at their current dwelling. PHA residents showed similar tendency. However, long term residency may lead to permanent occupation of the public rental apartment by the same family. Hence, a system which can provide equal residency opportunities to all low-income classes need to be developed. Residents of SH apartment were satisfied with the personal activities but were not satisfied with group activities among residents or regarding resident meetings. However, residents of PHA apartments were more satisfied with their management because there is more in-housing-complex activity programs. Therefore, more activity program for a resident should be developed after analysing programs of different apartments and current conditions in Korea. There were some noticeable divergences among residents, based on their age, term of residence and physical, emotional and mental problem, when evaluating in-housing-complex's programs. Thus, these factors are also need to be considered when planning and examining evaluation about the management of rental apartments.

• Journal of Korean society of Dental Hygiene
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• v.7 no.3
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• pp.231-245
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• 2007

This study aims to discuss plans to improve the satisfaction level of dental services by understanding characters of beliefs about dental manpower and analyzing its related factors. Data were collected by structured questionnaire whose subjects consist of 1607 persons from 13 years old to 69 years old, who have ever experienced dental institution. Both univariate and biovariate analyses were employed to analyze level of dentist and dental hygienist's beliefs and its related factors and the results gained from the surveys and search are as follows. 1. Among the questions to measure dentist's beliefs, 'Respect for patients' was evaluated as the best, and the lowest items were 'not-hopeful explanation about prognosis of dental treatment', 'satisfactory explanation' and 'whether treatments are stopped by pains or not'. In addition, among questions to measure dental hygienist's beliefs, 'kindly welcome' and 'detailed explanations about medical directions' are the items evaluated as the best and 'notice of waiting time' marked the lowest evaluation. 2. The factors related to beliefs about dentists were age, ache experiences, dental fear, self-reported dental health status, frequence and primary purposes of the visits dental institutions, elapsed time from recently visited, present of favorite dental clinic to visit regularly. 3. The factors related to beliefs about dental hygienists were age, education, occupation, ache experiences, frequence and primary purposes of the visits dental institutions, periodic check of teeth, present of favorite dental clinic to visit regularly. 4. Direct painful, painful treatment experience under insufficient local anesthetic, indirect painful experience and dental fear were positively correlated. And the relationships were positive between ache experiences, dental fear and self-reported dental health status, but relationships were negative between ache experiences, dental fear and dentist! dental hygienist's beliefs.

• Journal of Korean society of Dental Hygiene
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• v.8 no.4
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• pp.65-77
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• 2008

The purpose of this study was to offer basic data in order to make it possible for becoming the mentally more matured dental hygienist by being aware of stress factors on employment in preliminary dental hygienists and examining a coping plan according to it. The self-administered questionnaire research was carried out targeting Dental Hygiene Students at 4 colleges in metropolitan area for 1 month from October to November in 2007. Totally 209 questionnaires were collected. Among them, 206 copies were analyzed with methods in frequency analysis, correlation analysis, and ANOVA analysis by using SPSS WIN10.0 statistical program. As a result, the following conclusions were obtained. 1. 84.5% out of subjects were the active students. 95.2% and over 95.6%, respectively, were surveyed to be more than 'moderate' as for the academic achievement level and the satisfaction with college life. 2. the majority in the survey subjects were researched to receive high stress as for 'a guiding professor doesn't lead and have interest in my employment, thereby being disappointing' and 'failing to be employed is likely to lead to hurting pride so much'. 3. a coping type with stress in the survey subjects was researched to select a coping plan much as for 'sincerely hoping for the work to be well done', 'going out for a change', 'establishing a few countermeasures for solving a problem', 'overeating', and 'waiting while thinking it to be solved some time.' 4. most of stress factors had high correlation with a coping type with saying of 'trying to be alone as a whole', and had high correlation with 'failing to be employed is likely to lead to hurting pride so much' and 'overeating'. Even additionally, it was surveyed to have high correlation with 'smoking' and 'depending on the past experience'.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.5
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• pp.157-171
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• 2021

As smartphones spread and ICT technologies develop, taxi services have changed from hovering to platform-based calls and reservations. This has improved the mobility and accessibility of taxi users but caused problems, such as digital observing (no-responses to calls) for either short-distance services or services during the peak-demand periods. Digital Observing means ignoring and not accepting calls when they occur, which require improvement. Therefore, this study aims to derive measures to mitigate discrepancies in taxi supply and demand by adjusting the expected revenue of each taxi service using reinforcement learning based on the Taxi operation data. The results confirmed that the average complete response rate to calls would increase from 50.29% to 54.24% when incentives are applied, and an improvement of 5.86% can be achieved in short-distance sections of less than 5,000 won incentives. It is expected that the improvement will increase profitability for drivers, reduce the waiting time for passengers, and improve satisfaction with taxi services overall.

• Journal of Nutrition and Health
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• v.30 no.10
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• pp.1229-1243
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• 1997

The purpose of this study were to :(a) investigate meal costs, plate waste costs, and advantages/disadvantages of conventional /commissary foodservices and (b) compare the effectiveness of commissary foodservice systems with that of conventional systems. Questionnaires were developed and mailed to 136 schools in Kyonggi-do. A total of 106 questionnaires were usable, resulting in a 77.9% response rate. Teacher's teaching of good food habits and students satisfaction with school foodservices were surveyed in three schools from each system. Moreover, plate waste was measured to express cost and benefit in currency. Data were analyzed using the SAS package for description analysis, t-test, $\chi$$^2$ test, ANOVA, and the Vilcoxon rank sum test. Approximately seventy percent of 294schools in Kyonggi-do were operating commissary systems and most of them were of the rural (reduced paid) type. The number of meals served varied significantly between types of foodservice. The results of this study indicated that average food , labor utility , and supply costs were saved in the commissary system and that the total meal cost/person for a day was 1218.7 won compared to 1452.4 won in the conventional system. Though total meal costs were saved in the commissary system, dietitians had difficulties cooperating with school foodservice committees and supporters associations, especially in satellites of the commissary system. In addition, dietitians and teachers in the commissary system did not carry out teaching activities on good food habits to students as often as in the conventional system. Other problems that dietitians recognized in the commissary system were difficulties in training employees and parents for portion control and serving relatively simple menus. Students, as customers of school foodservices, are very important for system evaluation . Students in the commissary system scored of food itself , cleanliness of tableware, waiting time, quantity of meal and food temperature significantly lower than students in the conventional system. Moreover , the rate of plate waste was 20.5% in the commissary system as compared to 3.3% in the conventional system. Cost-effectiveness (saving 233.7won/person/day) is the main benefit of the commissary system. However , because of lower satisfaction scores and a highest plate waste rate, 201.9won/ person were wasted in the commissary system. The results of this study suggest that increasing the number of meals served within a commissary system might maximize the efficiency of the system, but increasing the number of satellites is not recommended because it might be out of dietitians control in many aspects.

• The Korean Journal of Nuclear Medicine Technology
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• v.21 no.1
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• pp.23-28
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• 2017

Purpose Recently, there has been increasing demands for clinical departments at Asan Medical center in Seoul. They want to see the results of lab tests about blood samples as soon as possible and to be reported to them on the day. As the main contents of the survey, we explained the goodness of Asan medical center's in vitro and the points to be improved. Based on this, it became an opportunity to create a positive image of In vitro laboratory. In addition, we could identify their specific requirements through the surveys. Materials and Methods In September 2016, a total of 14 questionnaire surveys were conducted for 49 clinical departments and outpatient nurses at Asan Medical center in Seoul. The survey consists of description questions to be able to express the intention of the individual and the questions made on the Likert 4 point scale. The main contents of 14 questions are composed of goodness of In Vitro laboratory and points to be improved. Results 62% answered that the best service in In Vitro laboratory was "good accuracy and reproducibility". On the other hand, as an inconvenience when requesting blood tests, 73% pointed out that "the result report time was long", which was recognized as a part to be improved. There are many contents that "The result of all tests is reported within 2 hours" on the day of the examination. In the question - 'Are there some examination results which do not coincide well with clinical observations?', 55 of 56 people answered "no". Above all, the majority answered that waiting for re-examination results is too long. This problem must be causing discomfort to the patients. Conclusion In order to improve these problems, the first thing is to increase the number of blood tests by using the current personnel, equipments and reagents to the fullest by item in Asan Medical Center's Nuclear medicine in vitro part. Secondly, in case of re-examinations, we use the "AMIS message" to show other clinical departments the reporting time. This methode improves the efficiency of work with nurses and increases satisfaction of custom service. Thirdly, the correlation was evaluated by selecting the test species that can be carried out by the shortening method. Currently, C-peptide and insulin are implemented in the reaction process to shorten 2 hours into 1 hour. Finally, we are considering purchasing new equipments for quick test results.

• Asian Pacific Journal of Cancer Prevention
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• v.14 no.12
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• pp.7229-7235
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• 2013

Background: To determine whether the Health Partner Program is effective in training long-term cancer survivors to be health coaches. Materials and Methods: We randomly assigned cancer survivors who were selected through a rigorous screening process to either the Health Partner Program or the waiting-list control group. The program consisted of 8 weeks of training in health management, leadership, and coaching. At baseline, 8, and 16 weeks, we measured primary outcomes using the Seven Habit Profile (SHP), the Korean Leadership Coaching Competency Inventory (KCCI), Ed Diner's Satisfaction with Life Scale (SWLS), and the Posttraumatic Growth inventory (PTGI) and secondary outcomes using the Hospital Anxiety and Depression Scale (HADS), the Impact of Event Scale-Revised (IES-R), and the Medical Outcomes Study (MOS) short form 36-item questionnaire (SF-36). Results: We recruited 70 subjects and randomly assigned 34 to the intervention group. The Sharpen the Saw habit of the SHP increased significantly more in intervention group than in the control group (p=0.049), as did most PTGI factors. The intervention group also showed a significantly greater enhancement of vitality (p=0.015) and mental health (p=0.049) SF-36 scores but no improvement in KCCI, SWLS, HADS, or IES-R scores. The intervention group also showed a greater clinically meaningful improvement in the "Think Win-Win" of SHP (p=0.043) and in the personal strength score (p=0.025) and total score (p=0.015) of the PTGI. Conclusions: Long-term cancer survivors can benefit from the Health Partner Program to become health coaches.

• The Korean Journal of Air & Space Law and Policy
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• v.29 no.2
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• pp.87-108
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• 2014

Recent examples of abuse by black consumers (including air travellers) against emotional laborers have become a serious social issue in Korea in that they are likely to violate human rights of those laborers. Emotional labor is a form of emotion regulation that creates a publicly visible facial and bodily display, and also emotional management within the workforce that creates a situation in which the emotion management by workers can be exchanged in the marketplace. Example professions that require emotional labor are: nurses, doctors, waiting staff, and television actors. However, as the economy moves from a manufacturing to a service-based economy, many more workers in a variety of occupational fields are expected to manage their emotions according to employer demands when compared to the past. One of symptoms deriving from emotional labor is smile mask syndrome abbreviated SMS, which is a psychological disorder proposed by professor Makoto Natsume where subjects develop depression and physical illness as a result of prolonged, unnatural smiling. And higher degree of using emotion regulation on the job is related to higher levels of employees' emotional exhaustion, and lower levels of employees' job satisfaction. In most part, emotional laborers are more abused and hurt by so called black consumers who are raising complaints relating to products and services purchased against service providers for the purpose of maliciously getting compensation. Against this background, the Korean Government abolished "the Consumer Protection Act" and instead promulgated "the Basic Consumer Act" in September 2006 which stipulates that consumers are expected to have protection as well as responsibility and duty. The Aviation Security Act cites the examples of prohibited behaviors (unruly passengers) while they are travelling. In addition, human rights of emotional laborers could be more protected by the enhancement of etiquettes and cavalry and improvement of culture and working environment.