• The Transactions of the Korea Information Processing Society
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• v.4 no.7
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• pp.1804-1820
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• 1997

In this paper, an efficient call control procedure is presented for next generation wireless ATM networks and its performance is mathematically analyzed using the open queueing network. This procedure is based on a new scheme called as the cell clustering. When we use the cell clustering scheme, at the time that a mobile connection is admitted to the network, a virtual cell is constructed by choosing a group of neighboring base stations to which the call may probabilistically hand over and by assigning to the call a collection of virtual paths between the base stations. Within a microcell/picocell environment, it is seen that the cell clustering can support effectively a very high rate of handovers, provides very high system capacity, and guarantees a high degree of frequency reuse over the same geographical region without requiring the intervention of the network call control processor each time a handover occurs. But since mobiles, once admitted, are free to roam within the virtual cell, overload condition occurs in which the number of calls to be handled by one base station to exceed that cell site's capacity of radio channel. When an overload condition happens, the quality of service is abruptly degraded. We refer to this as the overload state and in order to quantify the degree of degradation we define two metrics, the probability of overload and the normalized average time spent in the overload state. By using the open network queueing model, we derive closed form expressions for the maximum number of calls that can be admitted into the virtual cell such that the two defined metrics are used as the acceptance criteria for call admission control.

• Journal of Korean society of Dental Hygiene
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• v.18 no.2
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• pp.253-267
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• 2018

Objectives: The purpose of this study was to examine how the dentist's servant leadership affects the happiness index of dental hygienists. Methods: The subjects were 221 dental hygienists that have been working at dental clinics or dental hospitals. The data were analyzed using SPSS Version 20.0 (IBM Co., Armonk, NY, USA). An independent t-test and one-way ANOVA analysis were conducted to examine the difference in the happiness index of dental hygienists according to general characteristics. The independent t-test was conducted to examine organizational culture and happiness index according to upper and lower group based on the mean score for servant leadership. Pearson's correlation analysis was used to examine the correlation among key factors. Multiple regression analysis was conducted to identify factors influencing the happiness index of dental hygienists. Results: According to the analysis, there was a statistically significant positive correlation between the dentist's servant leadership, the organizational culture and the happiness index of dental hygienists. However, a stewardship of the dentist's servant leadership factors was not found to have any correlation with the market culture. A multiple regression analysis was performed after including the dentist's servant leadership, the organizational culture and the happiness index of dental hygienists. Meanwhile, the stewardship and community-building effect of the dentist's servant leadership had a statistically significant effect on the happiness index of dental hygienists. Consequently, a higher servant leadership factor in dentists was correlated with a higher happiness index of dental hygienists. Conclusions:The findings show that the dentist's servant leadership affect the happiness index of dental hygienists. Therefore, effective intervention and education programs related to the dentist's servant leadership and sound organizational culture are necessary to enhance dental hygienists' happiness index. Additionally, a follow-up study will determine the causal relationship among the dentist's servant leadership, the organizational culture and the happiness index of dental hygienists, considering organizational members and the environment of the dental clinics.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5722-5730
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• 2011

The purpose of this study was to investigate the effects of Maum meditation on anxiety, self-esteem and self-actualization of teachers and this is a one-group pretest-posttest design study. Three times of surveys were carried out for seven nights and eight days including July 25 - August 1, August 1 - 8, 2009 and January 2 - 9, 2010. Before and after Maum meditation, 108 teachers in the faculty training filled out the structured questionnaire. The data were analyzed by SPSS WIN 12.0. The results showed that there was a significant difference in self-esteem of the teachers between before and after Maum meditation(p=.001). The self-actualization of the teachers was also found to be significant before and after the meditation(p=.002). Maum meditation decreased the teachers' anxiety level and improved considerably the self-esteem and self-actualization level. So it is necessary to develop the self-concept questionnaire that can support the mental health promotion intervention program.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.5
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• pp.3111-3120
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• 2015

This research analyzes the decision-making status of expected graduates depending on their Holland preference type, as well as the influence career worries have on vocational decision status. By discovering this mediating effect, career counselors can carry out counseling based on the variety of career worries college students have, further supporting self-actualization of the client. As the previous studies on group counseling programs and the effects of career counseling have not yet considered the difference between various types of career worries and carried out identical programs and counseling method, this study is significant in marking the emergence of differentiated counseling intervention and strategy for more effective career counseling. This research is based on a survey conducted on 606 expected graduates attending six 4-year universities in Seoul, Gyeonggi, Chungcheong areas. The students surveyed are in the second semester of their senior (4th)years, during two weeks from november 4, 2013. First, the results showed that the level of career worries and the type of career worries differed between college students that have different types of Holland preference, and such difference was meaningful. Second, examination on the influences that career worries have on different vocational decisions depending on Holland preference types, found that the state of anxiety-free and anxiety toward career and dependence, as one of vocational decision types, together work as mediators. In conclusion, the significance of this research lies on that it reveals the mediating effects that career worries have on vocational decision status of college students.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.1
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• pp.214-222
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• 2013

This study investigated the relationships between sensory processing patterns and pain catastrophizing levels in well older adults to provide basic information for rehabilitation intervention. The participants of this study were 216 older adults aged over 65. The Adolescent/Adults Sensory Profile(AASP) was used to measure sensory processing patterns and the Pain Catastrophizing Scale(PCS) was employed to evaluate psychological variables of the pain. Self perception of the pain was measured with the Numerical Rating Scale(NRS). Gender and age differences were analyzed with t-test and relationships among sensory processing patterns, pain catastrophizing and pain symptom levels were analyzed with Pearson product-moment coefficients of correlation. Women had higher 'sensory sensitivity' and 'sensory avoiding.' The group over 75 years old had higher 'sensory avoiding,' 'low registration' and 'sensory seeking.' Women had higher pain catastrophizing and pain symptom levels. Negative correlations between 'rumination' and 'low registration' and 'helplessness' and 'sensory seeking' were found. Positive correlations were found between pain catastrophizing and pain symptom levels when they were 'sensory sensitivity' and 'sensory avoiding.' The results infer that sensory processing patterns are associated with psychological variables of the pain and there are differences based on gender and age. Further studies are warranted to support the results.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.22 no.3
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• pp.257-264
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• 2012

Objectives: This study's aims were to evaluate the effects of load center of gravity within an object lifted and feet placements on peak EMG amplitude acting on bilateral low back muscle groups, and to suggest adequate foot strategies with an aim to reducing low back pain incidence while lifting asymmetric load. Methods: The hypotheses that asymmetric load imposes more peak EMG amplitude on low back muscles contralateral to load center of gravity than symmetric load and maximum peak EMG amplitude out of bilateral ones can be relieved by locating one foot close to load center of gravity in front of the other were established based on biomechanics including safety margin model and previous researches. 11 male subjects were required to lift symmetrically a 15.8kg object during 2sec according to each conditions; symmetric load-parallel feet (SP), asymmetric load-parallel feet (AP), asymmetric load-one foot contralateral to load center of gravity in front of the other (AL), and asymmetric load-one foot ipsilateral to load center of gravity in front of the other (AR). Bilateral longissimus, iliocostalis, and multifidus on right and left low back area were selected as target muscles, and asymmetric load had load center of gravity 10cm deviated to the right from the center in the frontal plane. Results: Greater peak EMG amplitude in left muscle group than in right one was observed due to the effect of load center of gravity, and mean peak EMG amplitudes on both sides was not affected by load center of gravity because of EMG balancing effect. However, the difference of peak EMG amplitudes between both sides was significantly affected by it. Maximum peak EMG amplitude out of both sides and the difference of peak EMG amplitude between both sides could be reduced with keeping one foot ipsilateral to load center of gravity in front of the other while lifting asymmetric load. Conclusions: It was likely that asymmetric load lead to the elevated incidence of low back pain in comparison with symmetric load based on maximum peak EMG amplitude occurrence and greater imbalanced peak EMG amplitude between both sides. Changing feet positions according to the location of load center of gravity was suggested as one intervention able to reduce the low back pain incidence.

• The Journal of the Korea Contents Association
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• v.17 no.5
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• pp.479-490
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• 2017

The objective of this study is to examine the association of social networks and medical care utilization of elderly living alone depending on self-rated health status, and also to measure the moderating effects of welfare services for elderly. To this purpose, the data which was collected from the 2014 National Survey on Elderly in Korea was analyzed by Chi-square test and Poisson regression. According to the results, social networks and elderly welfare services affected to medical care utilization of elderly living alone, only who aware of their self-rated health status as bad. With this group, the frequency of contact with family and participation in lifelong education had a significant effect on increasing medical care utilization. In contrast, the frequency of contact with neighbors and the participation in elderly employment program were significant to reduce the utilization of medical care. Furthermore, the moderating effects of elderly welfare services were also measured that formal social gathering has an effect of increasing the medical care utilization of elderly living alone by expansion of their social networks. Based on these results, this study consequently has an implication for suggesting expansion of elderly welfare services, which might be an alternative to social networks of elderly living alone, and also for seeking the direction of political intervention that helps health promotion and disease prevention through the research of medical care utilization.

• Korean Journal of Social Welfare Studies
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• v.44 no.3
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• pp.347-369
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• 2013

Quality of life for people living with HIV/AIDS is significant as it concerns the treatment process, survival rate, HIV/AIDS prevention and treatment as well. Prevalent prejudice in our society significantly lowers the quality of patient's life. There is a need for an intervention and the effort to eliminate the stigma in order to lessen the negative effects as well. However, there are very few researches that examine the quality of life when it comes to people living with HIV/AIDS; even less when it comes to research that examines the stigma that affects the quality of life negatively. Therefore, this research seeks to verify the moderating effects of social support that seek to eliminate the stigma upon the quality of life in people living with HIV/AIDS. Research had been conducted with 102 people living with HIV/AIDS and the balancing effect of the social effort was verified through hierarchical regression analysis and a simple slope test. As the result of the research, control variables such as educational level and whether the patient has a job or not have significant effect and the stigma that the patient is aware of has significant negative effect. Social support had positive effect in quality of life and that it has a moderating effect on stigma which in turn affects the quality of life. Based on these results, social work related implications that were suggested are as follows; need for information and education as to better the quality of life for people living with HIV/AIDS and eliminate the social stigma and that group support program based on the local community which is needed for social support. Further research was advised based on the limitations of this research.

• Korean Journal of Social Welfare Studies
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• no.39
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• pp.395-423
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• 2008

This study investigated population characteristics that influencing treatment service use of people who are voluntarily using drug dependency treatment services by using logistic and hierarchical regression analysis. The research model of the current study was driven by the framework of the 'the Behavioral Model of Health Services Use(the Andersen model)' that has been broadly applied to study on health behavior. This study used data from a sample group of 80 adults by using purposive sampling. This study found that some predisposing factors, enabling factors and need factors have direct effects on service use. In detail, individuals who graduated from high school use drug dependency treatment utilities more than those who did not. Further, individuals who were given more support from family, peers, or others, use the treatment utilities more frequently and were more willing to use the utilities continuously. Furthermore, the greater the perceived need felt by the dependent, the greater the tendency to enter hospitals or shelters. The important implications of this study for social work practice and social policy can be summarized as follows: first, this study supports the idea that intervention for drug dependents in Korea should be focused on environment resources rather than population characteristics; and government must support drug dependent treatment systems; the present study was the first to investigate Korean drug dependents through taking a more positive view, as well as the first to apply 'the Behavioral Model of Health Services Use', and as such represents an example of how studies could be productively conducted in the future. Despite these implications, there remain some limitations in this study. These include the following: limitation in generalizability of the results; the cross-sectional nature of the study design; survey research through the questionnaire method; using foreign scales; and the difficulty of classifying treatment settings.

• Journal of Digital Convergence
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• v.17 no.11
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• pp.327-337
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• 2019

The purpose of the current study was to examine dual mediation effect of executive function deficiencies and adaptive cognitive emotion regulation strategies in the relation of smartphone addiction and subjective well-being and to suggest implications for adult smartphone addiction intervention programs. A self-report survey was conducted to 148 adults(71 males and 77 females) and the mediation effect was evaluated by regression analyses. Key findings are as follows. First, executive function deficiencies showed mediation effect on the relationship between smartphone addiction and adaptive cognitive emotion regulation strategies. Second, significant mediation effect of adaptive cognitive emotion regulation strategies was not found on the relationship between smartphone addiction and subjective well-being. Finally, the relation of smarphone addiction and subjective well-being was mediated by executive function deficiencies and adaptive cognitive emotion regulation strategies. These results imply that it would be helpful to train executive function and foster emotion regulation strategies to the adult smartphone addiction groups. Finally, limitations of this study and suggestions for future research of the entire adult age group were discussed.