• Korean Chemical Engineering Research
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• v.61 no.3
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• pp.401-406
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• 2023

With the development of industry, fine dust is causing difficulties in various fields such as environment, health, and life, and a large amount of pollutants generated from human social activities are emerging as a serious environmental problem due to air pollution. Therefore, in this study, activated carbon was added to remove fine dust and volatile organic compounds by spinning cellulose acetate polymer fibers on a silicon support using the electrospinning method. By varying the activated carbon ratio and electrospinning time, the fine dust blocking effect and toluene adsorption performance were confirmed according to the activated carbon ratio and filter thickness. As a result, it was shown that the particles were effectively blocked with the increase in the electrospinning time due to the filter thickness increase. Adsorbed amount of toluene was increased with increase in activated carbon amount. Light transmittance was decrease with increase in electrospinning time, showing that there were light transmittance in filters electrospun for 20~30 minutes.

• 대한공업교육학회지
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• v.33 no.1
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• pp.149-168
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• 2008

The purpose of this study is to verify the effect of PSpice instruction on academic achievement in 'Combination logic circuit' unit of 'Digital Logic Circuit' in industrial high school. Three kinds of null hypotheses were formulated. Two classes of the third grade of C technical high school in Gyeong-buk were divided into experimental group and control group in order to verify null hypotheses. In the experimental design, 'Non-equivalent control group pretest-posttest' model was utilized. This experiment was conducted for six classes, the experimental group was applied to PSpice instruction method before the circuit traning while the control group was applied to traditional lecture oriented method before the circuit traning. Window SPSS 10.0 korean language version program was used for the data analysis and independent sample t-test was used to identify the average of each group. Significance level was set to .05 level. The results obtained in this study were as follows; First, PSpice instruction had not an effect on academic achievement according to a group type. However, these instruction had an effect on the following sub-domains; the psychomotor domain. Second, PSpice instruction had not an effect on academic achievement according to a studies level. However, these instruction for middle and low level students had an effect on the cognitive and psychomotor domain, and for middle level students had an effect on the affective domain. Third, PSpice instruction had not an effect on shortening of a training requirement. However, this instruction for low level students had an effect on shortening of a training requirement. The study results of simulation instruction was chiefly efficient in the psychomotor domain. We could know that simulation instruction is efficient as went to a low level students than an upper level students. Thus, We may make the study effectiveness in various instruction method.

• Journal of Biomedical Engineering Research
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• v.19 no.6
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• pp.551-562
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• 1998

Amultiresolution filtering algorithm based on the physical SPECT lesion detachability provides and optimal solution for SPECT reconstruction problem. Related to the previous study, we estimated the SPECT lesion detection capability by m minimum detectable lesion sizes (MDLSs), and generated m reconstruction filters which are designed to maximize the smoothing effect at a fixed MDLS-dependent resolution level $\frac{MDLS}{4\sqrt{2In2}}$. The proposed multiresolution filtering algorithm used a coarse-to-fine approach for the m-level resolution filter images obtained from these m filters for a given projection image. First, the local homogeneity is determined for every pixel of the filter images, by comparing the local variance value computed in a window centered at the pixel and the mode determined from the distribution of the local variances. Based on the local homogeneity, the pixels declared as homogeneous are chosen from the filter image of the lowest resolution, and for the other pixels the same process is repeated for the higher resolution filter images. For the non-homogeneous pixels after this pixels after this repetition process ends, the pixel values of the highest resolution filter image are substituted. From the results of the simulated experiments, the proposed multiresolution filtering algorithm showed a strong smoothing effect in the homogeneous regions and a significant resolution improvement near the edge regions of the projection images, and so produced good adaptability effects in the reconstructed images.

• Journal of the Korean Electrochemical Society
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• v.4 no.1
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• pp.6-9
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• 2001

[ $SiO_2$ ] effect on the electrochemical properties of polymeric gel electrolytes(PGEs) reinforced with glass fiber cloth(GFC) was investigated . PGEs were composed of polyacrylronitrile(PAN), poly(vinylidenefluoride-co-hexafluoropropylene) (P(VdF-co-HFP)), $LiClO_4$ and three kind of plasticizer(ethylene carbonate, dietyl carbonate, propylene carbonate). $SiO_2$ was added to PGEs in the weight fraction of 10, 20, $30\%$ respectively. PGEs containing $SiO_2$ showed conductivity of over $10^{-3}S/cm\;at\;23^{\circ}C$ and electrochemical stability window to 4.8V. In the impedance spectra of the cells, which were constructed by lithium metals as electrodes, interfacial resistance increased due to growth of passivation layer during storage time and remarkable difference was not observed with content of $SiO_2$. In the impedance spectra of the lithium ion polymer batteries consisted of $LiClO_2$ and mesophase pitch-based carbon fiber(MCF), ohmic cell resistance of $SiO_2-free$ PGE was changed continuously with number of cycle, but those of $SiO_2-dispersed$ PGEs were not. Discharge capacity of the PGE containing $20wt\%\;SiO_2$ showed 132 mAh/g at 0.2C rate and $85\%$ of discharge capacity was retained at 2C rate.

• Korean Security Journal
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• no.37
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• pp.7-28
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• 2013

Based on the status of which the research is not active and the analysis is not progressed, the purpose of this study life up pride, value and professional ethic of private security guard. Also, through this research, it offers the effect on professional ethic, organizational trust and job satisfaction. The data collection and survey are taken by the private security business members who work staff member or manager. They are surveyed with convenience sampling that among 500 data, 46 data which are thought to be answered insincerely or lack are excluded, so the total of 454 answered data are included in the final analysis. After coding and input process, the data is analyzed by factor analysis, reliability analysis, correlation analysis and multiple regression analysis using window SPSS 19.0 version. Significance level is 0.05. The conclusion that has been made based on the statistical analysis results are the followings. Professional ethic has a positive impact on organizational trust, job satisfaction. The educational training of the company is connected job satisfaction resultantly. Also the professional ethics education will improve the ability of the individual. Finally, the professional ethics raises a job satisfaction. Also, Organizational trust has a positive impact on job satisfaction. This the while to agree with a research result about the other type of business worker who is researched. In order raising the job satisfaction, the effort for raising a organizational trust is necessary.

• Journal of muscle and joint health
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• v.9 no.1
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• pp.18-27
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• 2002

Introduction : Exercise has been suggested as an important nursing strategy in which to help elderly maintain functional performance and to enhanced quality of life. Most of exercise study has been reported on fitness exercise such as walking, swimming, dance etc for health of elderly. There have been few reports about exercise on the promotion of small and fine movement of elderly. The purpose of this pilot study was to determine an effect of 6 weeks hand and finger exercise in home to improve hand muscle strength such as grip strength and finger pinch pressure. Materials and Methods Design: This pilot study was used one group pre and post-test design. Sample: Twelve elderly women above 60 years of age or older living in community were selected by convenient sampling. Procedure: Signed informed consent was obtained prior to participate in this study. The authors met elderly and taught hand and finger exercise, daily a week for 6 weeks, within 30 minutes per session. But exercise frequency and strength were not same. Instruments: Left and right grip strength were measured by Bulb Dynamometer(made in USA) and left and right pinch pressure were measured by Baseline Hydraulic Pinch Gauge(made in USA). Data analysis: Discriptive data analyses were performed on all variables. Wilcoxon matched-pairs Signed-Ranks test were used to find difference of grip strength and pinch pressure between pre and post exercise using SPSS 10.0 for Window. Results: Samples age ranged from 60 to 73, Mean age was 65.3. All were women. Ten elderly were diagnosed osteoarthritis and one had DM. After six weeks hand and finger exercise, Left and right grip strength were higher than those of before exercise(Z=-2.667, P<0.01 ; Z=-3.065, p<0.01). And left pinch pressure after hand and linger exercise were higher than that of before pinch pressure (Z=-2.315, p<0.05). But Right pinch pressure was not shown significant change(Z=-1.099, p>0.05). Conclusions: Although this study was limited by the sample size and design, the findings provide some important implications for community based exercise nursing intervention. Short term (six weeks) exercise of hand and linger is shown to be useful as nursing intervention to maintain routine daily activities such as eating, writing, grip something for elderly.

• Korean Security Journal
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• no.23
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• pp.87-107
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• 2010

The purpose of this study is to examine the effects of customer aggression on the job stress and emotional burnout of security guards in casino. Investigating tools used questionnaire, the sampling was drawn from security guards at 6 casinos which had more than 30 security guards. To this study, the partisans of the study were 269 people. Data for creation for questionnaire is completely computed processing and using SPSS 15.0 Windows that is social studies scholastic mantle command program after imputed encoding according to each purpose. Analyzing techniques to use for analysis of data enforced technology figure analysis, factor analysis, reliability analysis, t-test, one-way ANOVA, multiple regression analysis. Through data analysis by such method and procedure, conclusion that gets in this research is as following. First, exposure that is difference that keep in mind partially as result that verify difference of aggression according to demographical features, job stress and emotional burnout that is security guard's in casino. Second, exposure that is difference that keep in mind as statistical as result that verify effect that customer aggression gets in job stress of security guards in casino. Third, exposure that is difference that keep in mind as statistical as result that verify effect that customer aggression gets in emotional burnout of security guards in casino.

• The Journal of the Korea Contents Association
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• v.15 no.11
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• pp.591-602
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• 2015

The purpose of this study was to examine the effect of participation in regular leisure sports on satisfaction with family relationship in adolescents. To achieve this purpose, 650 students of elementary and middle schools in Seoul and Gyeonggi area were selected and surveyed using the purposive sampling method. 611 survey samples were used in final analysis and 39 survey samples were excluded because of untrustworthy response. Statistical program AMOS 18.0 was used to conduct the confirmatory factor analysis and goodness of fit test, and SPSS 21.0 Window program was used to conduct analysis of frequency, t-test, and ANOVA. Through the analysis, the main findings were as follows; First, it was found that the adolescents participating in regular leisure sports has significant difference in satisfaction with family relationships compared to non-participation group. Second, satisfaction with family relationship of parental participation group in regular leisure sport was high the most followed by lonely participation group and non-participation group. Finally, authors described the implications and future studies.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.313-321
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• 2016

This study identified factors that have an influence on career preparation behavior in undergraduate students majoring in public health in technical colleges with the aim to provide basic data for the development of an employment counselling program which can have a positive influence on career preparation behavior. The subjects of this study were 556 college students studying public health in technical colleges in J $province^1$, J $province^2$, and G metropolitan city and they were randomly selected and sampled in convenience. The period of the survey was from September 7 to 9, 2015 and the survey was made with the use of a self-essay type questionnaire. 510 copies of the survey collected were analysed with the use of SPSS 14.0 for Windows. As a result it is shown that career barriers perceived by students studying public health in technical colleges had a negative effect on career preparation behavior. Therefore, organized and practical career counselling should be provided and career education programs should be developed to encourage subjects to have positive career preparation behavior. Therefore, it is suggested that practical career counselling and career education program should be developed to lead students studying public health to positive career preparatory activity, and research to verify its effect should be conducted.

• Journal of Korean Public Health Nursing
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• v.18 no.1
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• pp.61-73
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• 2004

This study is intended to suggest fundamental data necessary for developing MBTI program that can help improve interpersonal relation skills of nursing science major students and their cohesion. This study is pre-experimental research by one group pretest-post test design to examine the effect of MBTI(Myers and Briggs Type Indicator) basic program on the interpersonal relationship between nursing science major students and their group cohesion and the relationship between interpersonal relationship and their group cohesion. I selected 39 of sophomore students in the department nursing science of K university in I metropolitan city as test group. 35 of them joined post-test. Pretest and MBTI basic program were done before conducting MBTI program. Collected data were analyzed by SPSS window 7.5. The difference in test group before and after conducting program was examined by paired t-test. The correlation between interpersonal relationship and group cohesion was measured by using Pearson Correlation Coefficient. The findings are as follows. $\cdot$ The difference before and after conducting MBTI program by sub-factors of interpersonal relation: There was no significant difference, as the average figure of interpersonal relation in test group was 87.22 before conducting MBTI and 85.08 after conducting MBTI respectively. The average figure of sensitivity among the sub-factors of interpersonal relation was 7.71 before conducting MBTI and reduced to 7.08 after conducting MBTI and there was significant difference between before and after conducting MBTI(t=-2.484, p=.018) $\cdot$ The difference in group cohesion before and after conducting MBTI program: The average figure of group cohesion in test group was 56.68 before conducting MBTI and increased a bit to 56.80 after conducting MBTI\, but there was no significant difference between them. $\cdot$ The relationship between interpersonal relationship and group cohesion before and after conducting MBTI: As the relationship between interpersonal relationship and group cohesion before and after conducting MBTI is examined, there was positive correlation of the significance level. p<.05 before conducting MBTI(r=.320, p=.047), and of the significance level, p<.01 after conducting MBTI(r=.780, p=.000). The investigation on the relation between sub-factors of group cohesion and of interpersonal relation before conducting MBTI basic program revealed that there was positive correlation between openness, reliability, friendliness and satisfaction, and group intervention, between receptivity among group members and reliability, and between group atmosphere and satisfaction. The investigation on the relation between sub-factors of group cohesion and of interpersonal relation after conducting MBTI basic program revealed that there was positive correlation between openness, communication, understanding, friendliness and satisfaction. and group intervention. There was positive correlation between receptivity among group members and openness, communication, understanding, friendliness and satisfaction. There was positive correlation between openness, communication, friendliness and satisfaction, and group atmosphere. Based on the above findings, I realize that MBTI basic program is essential to the improvement of group cohesion. In addition, it is shown that the sub-factors of interpersonal relation such as openness, communication, friendliness, satisfaction, and understanding, and the sub-factors such as group intervention and receptivity among group members are major factors to improve interpersonal relationship and group cohesion. So, the future MBTI program should include sub-programs that deal with the above factors to improve interpersonal relationship and group cohesion.