• Advanced Composite Materials
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• v.17 no.4
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• pp.359-372
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• 2008

The moisture absorption behavior of carbon fiber-reinforced plastic (CFRP) and its effect on dimensional stability were examined. Moisture diffusivity in CFRP was determined by measuring a specimen's weight during the moisture absorption test. Three types of CFRP specimens were prepared: a unidirectionally reinforced laminate, a quasi-isotropic laminate and woven fabric. Each CFRP was processed into two geometries - a thin plate for determination of diffusivity and a rod with a square cross-section for the discussion of two-dimensional diffusion behavior. By solving Fick's law expanded to 3 dimensions, the diffusivities in the three orthogonal directions were obtained and analyzed in terms of the anisotropy of CFRP moisture diffusion. Coefficients of moisture expansion (CMEs) were also obtained from specimen deformation caused by moisture absorption. During moisture absorption, the specimen surfaces showed larger deformation near the edges due to the distribution of moisture contents. This deformation was reasonably predicted by the finite element analysis using experimentally determined diffusivities and CMEs. For unidirectional CFRP, the effect of the fiber alignment on CME was analyzed by micromechanical finite element analysis (FEA) and discussed.

• Journal of Korean Academy of Nursing
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• v.35 no.7
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• pp.1268-1276
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• 2005

Purpose: This study was amied to identify the effects of a 12 week Korean traditional dance movement program on balance, depression, medical cost, medical institution's utilization and fall among elderly women. Methods: Using a quasi-experimental design, the experimental group was composed of 130 subjects and the control group was composed of 123 subjects. The experimental group participated in a 12 week Korean traditional dance movement program 3 times a week from December 2002 to February 2003. Data was analyzed with descriptive statistics, the chi-square test, paired t-test and t-test. Results: There was siginificant improvement in balance(right leg p=.000, left leg p=.004), depression(p=.000), and the medical institution's utilization(p=.001) and fall(p=.002) in the experimental group compared to the control group. Conclusion: A Korean traditional dance movement program improved balance, depression, and decreased fall and medical cost in elderly women. Therefore, we recommend this program be utilized as a health promoting program and falls preventing program for the elderly in the community.

• Journal of Korean Academy of Nursing
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• v.34 no.1
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• pp.123-131
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• 2004

Purpose: This study was aimed to identify the effects of a ten-week stretching exercise program on physiological, psychological functions, and activities of daily living(ADL) among elderly women. Methods: Using a quasi-experimental design, the experimental group received a ten-week stretching exercise program 3 times a week from March to May in 2002. They were divided into 22 persons in the experimental groups in 2 halls where the program was incorporated, and 22 persons in the control group in 2 halls, where the program wasnot incorporated. Data was analyzed with descriptive statistics, the chi-square test, Fisher's Exact test, and ANCOVA was considered significant as a 2-tailed test. Results: There was a significant improvement in diastolic blood pressure(P=0.023), total cholesterol (P=0.019), triglycerides (P=0.002), spine ROM(P=0.000), trunk and hip-joint ROM(P=0.000), percent of body fat(P=0.039) as physiological functions, depression(P=0.041) as a psychological function, and activities of daily living(P=0.001) in the experimental group compared to the control group. Conclusion: A stretching exercise program showed good effects on improving physiological functions, psychological functions and activities of daily living among the elderly women in a city. Therefore, we recommend this program be utilized as a health promoting program for the elderly in the community.

• Journal of muscle and joint health
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• v.17 no.2
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• pp.151-161
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• 2010

Purpose: The purpose of this study was to identify the effect of Tai Chi exercise on loneliness, sleep pattern, and instrumental activities of daily living in elderly women. Methods: A quasi-experimental design, a nonequivalent control group pretest-posttest was used. Elderly women who agreed to participated in the study were assigned into an experimental group (n=20) or a control group (n=20). The experimental group participated in Tai Chi exercise program (Sun-style 12 forms) for 50 minutes per session, 2 times a week for 8 weeks. Tai Chi exercise program consisted of 10 minutes for warm-up, 35 minutes for main session, and 5 minutes for cooling down. Study outcomes were measured through study questionnaires. Data were analyzed using Chi-square test, t-test and Mann-Whitney test by SPSS WIN 14.0 program. Results: Compared with the control group, the experimental group showed significant improvement in loneliness (t=-2.733, p=.009), sleep pattern (t=2.552, p=.015), and instrumental activities of daily living (z=-2.171, p=.030). Conclusion: Tai Chi exercise program may be an effective nursing intervention for elderly women.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.23 no.2
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• pp.216-223
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• 2016

Purpose: This study aimed to evaluate the effects of sex education, focusing on the sexual activities of the elderly, on high school girls' sexual knowledge, attitudes, and perceptions. Methods: A quasi-experimental pre-post design was used, and the data of 82 participants (41 in each group) were analyzed. The educational effects were assessed through sexual knowledge, attitudes, and perceptions. The data were analyzed through SPSS 18.0, using descriptive statistics, chi-square tests, and paired t-tests. Results: The experimental and control groups had similar demographics. Sex education was effective in increasing sexual knowledge (p<.001), and changing the attitudes (p<.001) and perceptions (p<.001) of members of the experimental group for the better. Conclusions: This study has shown that sex education can improve high school girls' understanding of elderly sexual activities. This study is meaningful in that, it sought to facilitate a positive change in young people's attitudes towards elderly sexuality and quality of life.

• Research in Community and Public Health Nursing
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• v.14 no.3
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• pp.424-431
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• 2003

Purpose: The purpose of this study was to explore the effects of hand acupoint massages on ADL ability and grip strength of stroke patients. Method: This study was designed as a quasi-experimental nonequivalent control group for pre and post-test. Twenty-eight patients were assigned to the experimental group and thirty to the control group. The hand acupoint massage was applied to both hands of the experimental group for sixteen minutes each time, a total of 15 times during five weeks. The patient's ADL ability and grip strength were measured before and after the program. The data were analyzed with mean. percent, chi-square, a paired t-test and t-test. Result: The level of ADL ability was significantly higher in the experimental group than in the control group. Also, the level of grip strength was significantly higher in the experimental group of the plegic side than in the control group, but not in the normal side. Conclusion: We have found that the hand acupoint massage helps the stroke patients improve their ADL ability and grip strength. Through this result, the hand acupoint massage could be considered as an effective application for rehabilitation of hemiplegic patients after stroke.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.2
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• pp.330-343
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• 2011

In this paper, we propose two schemes to reduce the complexity of fixed-complexity sphere decoder (FSD) algorithm in the ordering and tree-search stages, respectively, while achieving quasi-ML performance. In the ordering stage, we propose a QR-decomposition-based FSD signal ordering based on the zero-forcing criterion (FSD-ZF-SQRD) that requires only a few number of additional complex flops compared to the unsorted QRD. Also, the proposed ordering algorithm is extended using the minimum mean square error (MMSE) criterion to achieve better performance. In the tree-search stage, we introduce a threshold-based complexity reduction approach for the FSD depending on the reliability of the signal with the largest noise amplification. Numerical results show that in $8{\times}8$ MIMO system, the proposed FSD-ZF-SQRD and FSD-MMSE-SQRD only require 19.5% and 26.3% of the computational efforts required by Hassibi’s scheme, respectively. Moreover, a third threshold vector is outlined which can be used for high order modulation schemes. In $4{\times}4$ MIMO system using 16-QAM and 64-QAM, simulation results show that when the proposed threshold-based approach is employed, FSD requires only 62.86% and 53.67% of its full complexity, respectively.

• Journal of Positioning, Navigation, and Timing
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• v.9 no.4
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• pp.347-356
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• 2020

In this study, Inclined Geosynchronous Orbit (IGSO) and Geostationary Orbit (GEO) of BeiDou System (BDS) and Quasi Zenith Satellite System (QZSS) satellites positions and clock errors calculated by broadcast ephemeris and compared with Multi-GNSS Experiment (MGEX) products provided by five Analysis Centers (ACs). Root Mean Square Errors (RMSE) calculated for satellite position error. The IGSO results showed that 1.82 m, 0.91 m, 1.28 m in BDS and 1.34 m 0.36 m 0.49 m in QZSS and the GEO results showed that 2.85 m, 6.34 m, 6.42 m in BDS and 0.47 m, 4.79 m, 5.82 m in QZSS in the direction of radial, along-track and cross-track respectively. RMS calculated for satellite clock error. The IGSO result showed that 2.08 ns and 1.24 ns and the GEO result showed that 1.28 ns and 1.12 ns in BDS and QZSS respectively.

• Journal of Distribution Science
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• v.19 no.8
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• pp.101-112
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• 2021

Purpose: This study aims to explain the effect distribution strategy and competitiveness of entrepreneurial personality on marketing capabilities and performance, the effect of marketing capabilities on marketing performance, the role of marketing capabilities as a mediating variable on the effect of entrepreneurial personality on marketing performance, and the role of credit access moderating effect of entrepreneurial personality on marketing capabilities and performance. Research design, data, and methodology: This research was conducted in Bali, on a small clothing industry. The sample size was set at 150 respondents, using a cluster random sampling approach. Data were analyzed using descriptive analysis techniques and partial least square. Result: The findings show that; entrepreneurial personality and marketing capabilities have a significant effect on marketing performance, entrepreneurial personality has a significant effect on marketing capabilities. Another result shows that marketing capability mediates the effect of entrepreneurial personality on marketing performance, access to credit acts as a moderating predictor, and as quasi moderating the effect of entrepreneurial personality on marketing performance. Conclusions: Entrepreneurs should try to increase their knowledge and skills in marketing formally or informally. Competence in terms of individual knowledge and skills can indicate social capital investment, which indirectly contributes to one's mindset and insight.

• Journal of Preventive Medicine and Public Health
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• v.55 no.6
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• pp.586-594
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• 2022

Objectives: This study investigated the effectiveness of the social marketing mix approach in increasing students' knowledge about smoking, promoting positive attitudes toward smoking cessation, and decreasing smoking behavior. Methods: This quantitative research study incorporated a quasi-experimental method with a pretest-posttest non-equivalent group design. Using the purposive sampling technique, 152 smoking students were selected as participants. They were divided into 2 equal groups, with 76 students in the control group and 76 in the intervention group. The data were collected using questionnaires and analyzed with the chi-square test, independent t-test, Wilcoxon signed-rank test, and Mann-Whitney U-test. Results: The social marketing mix intervention was effective in increasing the students' knowledge about smoking (p<0.001), improving their attitude toward smoking cessation (p<0.001), and reducing their smoking behavior (p=0.014). Conclusions: This approach should be implemented by local governments to reduce smoking behavior in the community, especially among teenagers, in addition to instituting a smoking ban and applying fines.