• Journal of Communications and Networks
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• v.13 no.1
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• pp.32-42
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• 2011

Frequency reuse among relay stations (RSs) in a down-link access zone is widely adopted for throughput enhancement in IEEE 802.16j relay networks. Since the areas covered by the RSs or the base station (BS) may overlap, some mobile stations (MSs) at the border between two neighboring transmitting stations (RS or BS) using an identical frequency band may suffer severe interference or outage. This co-channel interference within the cell degrades the quality of service (QoS) fairness among the MSs as well as the system throughput. Exclusive use of a frequency band division (orthogonal resource allocation) among RSs can solve this problem but would cause degradation of the system throughput. We observe a trade-off between system throughput and QoS fairness in the previously reported schemes based on frequency reuse. In this paper, we propose a new frequency reuse scheme that achieves high system throughput with a high fairness level in QoS, positioning our scheme far above the trade-off curve formed by previous schemes. We claim that our scheme is beneficial for applications in which a high QoS level is required even for the MSs at the border. Exploiting the features of a directional antenna in the BS, we create a new zone in the frame structure. In the new zone, the RSs can serve the subordinate MSs at the border and prone to interference. In a 3-RS topology, where the RSs are located at points $120^{\circ}$ apart from one another, the throughput and Jain fairness index are 10.64 Mbps and 0.62, respectively. On the other hand, the throughput for the previously reported overlapped and orthogonal allocation schemes is 8.22 Mbps (fairness: 0.48) and 3.99 Mbps (fairness: 0.80), respectively. For a 6-RS topology, our scheme achieves a throughput of 18.38 Mbps with a fairness of 0.68; however, previous schemes with frequency reuse factors of 1, 2, 3, and 6 achieve a throughput of 15.24 Mbps (fairness: 0.53), 12.42 Mbps (fairness: 0.71),8.84 Mbps (fairness: 0.88), and 4.57 Mbps (fairness: 0.88), respectively.

• Journal of East-West Nursing Research
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• v.14 no.1
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• pp.56-67
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• 2008

Purpose: This study was a descriptive survey study to examine the degrees of the health perception, health knowledge, and health promoting behavior in the elderly, and the relationship among the above factors. Methods: Subjects were 183 persons with the age over 65 years living in Seoul. Measures were Health Perception Questionnaire (HPQ) developed by Ware (1979), the health knowledge instrument developed by Ha Gwi-Yeom (2005), and the Health Promotion Lifestyle Profile (HPLP) developed by Walker, Sechrist & Pender (1987) and modified by Hong Young-Ae (2003). Data were collected from March 4 to April 12, 2007. Data were analyzed by frequency, percentage, mean, standard deviation, t-test, ANOVA, Pearson's correlation using the SPSS program. Results: The mean level of health perception was 2.71(${\pm}0.77$), the mean level of health knowledge was 7.10(${\pm}1.82$), and the mean level of health promoting behavior $2.72{\pm}0.86$. Health promoting behavior showed a positive correlation with health perception (r=.715) and health knowledge (r=.543), and a positive relation was observed between health perception and health knowledge (r=.526). Conclusion: The enhancement of health perception and health knowledge are needed to improve health promoting behavior of the elderly. Also, the general characteristics of elderly should be considered to improve health promoting behavior of elderly.

• Journal of Korea Port Economic Association
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• v.25 no.4
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• pp.251-280
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• 2009

The value of Environment is so high and important that no one can estimate it correctly. In the area of Logistics, Environment protection is very important and keen subject for the present and for the future of this country and people. Environmental logistics, similarly used as Green logistics, means the protection of Nature and Environment and reduces all kinds of factors and behaviors that may destroy and deteriorate current Environment. It also include the preservation of Nature and sustainable development. Environmental logistics aims to save natural resources and to promote reuse of all kinds of materials and to increase the utilization of Environment friendly substitute goods. In this paper the concept and characteristics of Environmental logistics were summarized and described. Also the main previous studies were surveyed. Some of important cases and experiences which were introduced and applied in major countries such as Japan, Hongkong, USA and the case of PHILIPS were summarized and analyzed. With these cases and analysis, this paper suggested some alternatives and countermeasures for the improvement of Environmental logistics in terms of 3 dimensions such as Country, Company and Individual level. And a strategy model for enhancement of the Environmental logistics was suggested and limitations of this paper and future research directions were described.

• Journal of Korean Clinical Nursing Research
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• v.23 no.2
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• pp.142-150
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• 2017

Purpose: Nursing workplace spirituality (NWS) has received attention as a new and meaningful subject for nursing to consider, but little is known about the relation of NWS to nursing. The purpose of this study was to identify the effect of NWS on job satisfaction, burnout and turnover intention. Methods: Participants were 145 clinical nurses, who had worked for over 6 months in one of four general hospitals in B city. Data were collected using self-reported questionnaires and analyzed using descriptive statistics, independent t-test, ANOVA, Pearson coefficient and hierarchical multiple regression. Results: In the second hierarchy controlling general characteristics, significant predictors of job satisfaction were burnout and NWS, which explained 45.0% of the variance. NWS had more influence on job satisfaction than burn out, and the model was suitable. NWS showed no statistically significant effect on burnout and turnover intention, when general characteristics and job related factors were controlled. Conclusion: Findings indicate that nursing workplace spirituality has a positive influence on job satisfaction, but no direct influence on burnout or turnover intention, which may indicate an indirect influence. Nurse managers need to develop the NWS enhancement program and provide them to nurse to improve job satisfaction.

• Journal of Korean Academy of Nursing
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• v.34 no.4
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• pp.646-654
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• 2004

Purpose. The purpose of this study was to test the effectiveness of a comprehensive smoking cessation program for Korean adolescents. Method. The study design was quasi-experimental with one pre and three post-tests. The three posttests were done immediately after, three months later, and six months after the completion of the program. A total of 43 high school students who smoked participated in the study with 22 in the experimental group and 21 in the control group. The smoking cessation program consisted of 9 sessions with content on enhancement of self-efficacy, stress management, correction of distorted thoughts, consciousness raising, and assertiveness training. The study variables were urine cotinine levels, self-efficacy, stress, and stages of changed behavior. Results. Urine cotinine levels significantly decreased in the experimental group after the program (F=3.02, p=.06) but significantly increased in the control group (F=6.32, p=.004). Self-efficacy and the degree of stress did not change in either group. The stages of smoking cessation behavior tended to change when compared with raw data for the experimental group. For most participants, the stages of change had been precontemplation and contemplation, but changed to action and maintenance stage among the experimental group. Conclusion. The program was effective in smoking cessation and influencing stages of change but did not change psychosocial factors such as self-efficacy and stress. It is suggested a program should be developed to change psychosocial variables on a long-term basis. It is also desirable to involve peers and families of adolescents who smoke when planning programs to enhance social support.

• Industry Promotion Research
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• v.1 no.2
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• pp.103-108
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• 2016

This study analyzed the effect of female insurance planners' personal traits on job performance in Dangjin, Chungnam. The study results showed that job importance recognition(p<.05, ${\beta}=.321$) significantly affected job satisfaction, so highly recognizing the importance and social reputation improved job satisfaction. Personal traits didn't significantly affected contract performace and workplace satisfaction, but job performance varied by continuos service year. This study provided implications by finding out the degree of importance of personal traits on job performance improvement and verifying the effect of personal factors on performace enhancement of female insurance planners.

• Phonetics and Speech Sciences
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• v.3 no.1
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• pp.125-134
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• 2011

The current study investigated the effects of experience of deaf speech, severity of speaker's articulation, and linguistic cues on speech intelligibility of congenitally deafened adults with cochlear implants. Speech intelligibility was judged by 28 experienced listeners and 40 inexperienced listeners using a word transcription task. A three-way (2 $\times$ 2 $\times$ 4) mixed design was used with the experience of deaf speech (experienced/inexperienced listener) as a between-subject factor, the severity of speaker's articulation (mild to moderate/moderate to severe), and linguistic cues (no/phonetic/semantic/combined) as within-subject factors. The dependent measure was the number of correctly transcribed words. Results revealed that three main effects were statistically significant. Experienced listeners showed better performance on the transcription than inexperienced listeners, and listeners were better in transcribing speakers who were mild to moderate than moderate to severe. There were significant differences in speech intelligibility among the four different types of cues, showing that the combined cues provided the greatest enhancement of the intelligibility scores (combined > semantic > phonological > no). Three two-way interactions were statistically significant, indicating that the type of cues and severity of speakers differentiated experienced listeners from inexperienced listeners. The current results suggested that the use of a combination of linguistic cues increased the speech intelligibility of congenitally deafened adults with cochlear implants, and the experience of deaf speech was critical especially in evaluating speech intelligibility of severe speakers compared to that of mild speakers.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.19 no.2
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• pp.155-161
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• 2001

When determining a three dimensional position for engineering purposes, we can use the GPS survey to find position. According to the enhancement of precision for domestic Geoid model, the positional accuracy of GPS about precise method of vertical position has been also increased. But by considering Geoid undulation, it is difficult to measure GPS-derived elevations. Because Geoid undulation has changed little in local sites, GPS-derived elevations are similar to orthometric height. By ignoring Geoid undulation, it is possible to measure GLT-derived elevations at the local. small construction sites. GLT(GPS Leveling Technique) provides a method for computing orthometric heights. GLT processes the data more rapidly than conventional measurement devices. We only considered the weight factors affecting accuracy between the points. That is, the GPS procedures to produce satisfactory elevation accuracy depends on the method of observations, receivers and conditions of the local environment. A comparison was performed between the GPS survey using Geoid model and GLT at a part within Pusan National University and construction model sites in South Korea. And the writers proved the GPS surveying is efficient in positioning accuracy, time, and cost on a construction sites.

• Molecules and Cells
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• v.41 no.2
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• pp.73-82
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• 2018

Cancer preventive activities of green tea and its main constituent, (-)-epigallocatechin gallate (EGCG) have been extensively studied by scientists all over the world. Since 1983, we have studied the cancer chemopreventive effects of EGCG as well as green tea extract and underlying molecular mechanisms. The first part of this review summarizes groundbreaking topics with EGCG and green tea extract: 1) Delayed cancer onset as revealed by a 10-year prospective cohort study, 2) Prevention of colorectal adenoma recurrence by a double-blind randomized clinical phase II trial, 3) Inhibition of metastasis of B16 melanoma cells to the lungs of mice, 4) Increase in the average value of Young's moduli, i.e., cell stiffness, for human lung cancer cell lines and inhibition of cell motility and 5) Synergistic enhancement of anticancer activity against human cancer cell lines with the combination of EGCG and anticancer compounds. In the second part, we became interested in cancer stem cells (CSCs). 1) Cancer stem cells in mouse skin carcinogenesis by way of introduction, after which we discuss two subjects from our review on human CSCs reported by other investigators gathered from a search of PubMed, 2) Expression of stemness markers of human CSCs compared with their parental cells, and 3) EGCG decreases or increases the expression of mRNA and protein in human CSCs. On this point, EGCG inhibited self-renewal and expression of pluripotency-maintaining transcription factors in human CSCs. Human CSCs are thus a target for cancer prevention and treatment with EGCG and green tea catechins.

• Journal of Korean Public Health Nursing
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• v.26 no.1
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• pp.5-15
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• 2012

Purpose: The effects of the organizational culture and health promotion life style on job satisfaction of nurses in general hospitals have been studied in an effort to provide basic information that will be helpful in effective management of the organization and enhancement of nursing. Method: The 341 samples used in the study were selected randomly from general hospitals having more than 250 beds in Gwangju province and Yosu province. Data collected were analyzed for frequency, percentage, ANOVA, t-test, Pearson's correlation analysis, and Multiple regression analysis using SPSS, a program package for statistical analysis. Result: Factors affecting job satisfaction included work years, position, monthly income, stress management, which is a substructure of health promotion life style, innovation-oriented culture, relation-oriented culture, and task-oriented culture in organizational culture. Results showed an influence of 64.2%. Ed - highlight: Please review. Conclusion: The organizational culture, such as an innovation-oriented culture, relation-oriented culture, or task-oriented culture, has a positive influence on job satisfaction.