• Journal of the Korean Operations Research and Management Science Society
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• v.40 no.1
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• pp.155-170
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• 2015

This study examines whether CSR (corporate social responsibility) activities of the public sector affect on its corporate evaluation in their perspective of consumers. Both public and private sectors are being encouraged to conduct the CSR activities in the four dimensions of economic, legal, ethical, and philanthropic responsibility. While many previous studies have examined the relationship between CSR and corporate's business performance, these studies focus on the private companies, not the public sector. In this paper, we offer a consumer-side study about the effect of CSR on the corporate evaluation on the public sector. The purpose of this study is to understand the effect of fit of CSR activity, perceived engagement, and perceived authenticity on the consumer's corporate evaluation of the public sector. We conducted two quasi-experiments involving 223 respondents using the actual CSR cases of two Korean public sectors. As a result, consumer's perception of engagement and authenticity about the CSR of public sector affects the corporate evaluation in a positive way. The 3-way interaction effect among fit of CSR activity, perceived engagement, and perceived authenticity was significant in corporate evaluation. To achieve successful CSR of the public sector, the public organizations need to increase the communication with their consumers and to implement the strategic CSR activities which can improve the consumer's perception of authenticity about CSR.

• Korean Journal of Health Education and Promotion
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• v.27 no.4
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• pp.73-81
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• 2010

Objectives: The purpose of this study was to evaluate the effects of 12 weeks walking exercise program participation on changes in aging-related hormones concentration in elderly men. Methods: 16 elderly men(above 65 years old) were participated in 12 weeks walking exercise program by group types(exercise group ; n=8 & control group ; n=8), and their aging-related hormones(GH, testosterone and melatonin) levels were assessed before program(0 week) and after program(12 weeks). Regularly walking exercise program(field walking exercise) performed for 12 weeks(3days/week, 60~70min/day, HRR 55~65%). All data were expressed as mean and standard deviation by using SPSS/$PC^+$(ver. 13.0) program, and to evaluate the differences before and after treatment by groups, data were analyzed by paired t-test(a${\leq}$.05) and 2-way ANOVA was performed to examine the differences between groups and within groups by variables. Results and Conclusion: The conclusions obtained from this study were as follows ; In growth hormone. testosterone and melatonin response after 12 weeks exercise was increased significantly in walking exercise group(p<.01; p<.001; p<.001). And in result of 2-way ANOVA analysis for group, exercise, group${\times}$exercise, as compared with the exercise, there is significant difference in all items. Interaction effect of between group and exercise is difference significantly on GH(F=5.915, p<.05), testosterone(F=15.117, p<.01) and melatonin(F=8.131. p<.01) in all groups. We observed a direct relationship(positive improvement) between the regular physical activity and aging-related hormones(growth hormone, testosterone and melatonin concentrations) in elderly men.

• Restorative Dentistry and Endodontics
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• v.28 no.4
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• pp.326-333
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• 2003

Ormocer has organic-inorganic compound polymers. One of advantages of ormocer is reduced polymerization shrinkage. The purpose of this study was to compare the amount of contraction shrinkage of composite resins and ormocers. Additionally, the time of each material when there is no further change of contraction shrinkage was analysed. Four brands of composite resins (P-60. Surefil, Z-250 and Denfil) and two brands of ormocers (Definite and Admira) were used. 20 seconds, 40 seconds and 60 seconds of curing times were given. Contraction shrinkage of them were measured using a linometer for 80 seconds. The effect of material and curing time to contraction shrinkage at the time of 80 seconds was analysed by two-way ANOVA. The effect of time to contraction shrinkage was analysed by one-way ANOVA and the time when there was no further change of the contraction shrinkage was analysed. The results are as follows: 1. P-60, Definite, Z-250 and Denfil had no further change of contraction shrinkage from the time of 20 seconds, and Surefil and Admira had no further change of contraction shrinkage from the time of 10 seconds. 2. Statistical analysis revealed volumetric shrinkage varied among material (p<0,05). No significant difference of contraction shrinkage among different curing times was found, and there was no effect of interaction between materials and curing times to contraction shrinkage. 3. Definite and Admira showed the statistically same contraction shrinkage with those of Z-250 and P-60. which is higher than that of Surefil and lower than that of Denfil (p<0.05).

• School Mathematics
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• v.18 no.3
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• pp.571-587
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• 2016

Nam(2008a) suggested that the role of teacher for helping students to learn mathematical structures should be the manifestor of tacit knowledge. But there have been lack of researches on embodying the manifestation of tacit knowledge. This study embodies the manifestation of tacit knowledge by showing that exemplification is one way of manifestation of tacit knowledge in terms of goal, contents, and method. First, the goal of the manifestation of tacit knowledge through exemplification is helping students to learn mathematical structures. Second, the manifestation of tacit knowledge through exemplification intends to teach students mathematical structures in the tacit dimension by perceiving invariance in the midst of change. Third, the manifestation of tacit knowledge through exemplification intends to teach students mathematical structures in the tacit dimension by constructing explicit knowledge creatively, reflection on constructive activity and social interaction. In conclusion, exemplification could be seen one way of embodying the manifestation of tacit knowledge in terms of goal, contents, and method.

• Restorative Dentistry and Endodontics
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• v.40 no.1
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• pp.30-36
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• 2015

Objectives: This study was performed to determine whether the combined use of one-bottle self-etch adhesives and composite resins from same manufacturers have better bond strengths than combinations of adhesive and resins from different manufacturers. Materials and Methods: 25 experimental micro-shear bond test groups were made from combinations of five dentin adhesives and five composite resins with extracted human molars stored in saline for 24 hr. Testing was performed using the wire-loop method and a universal testing machine. Bond strength data was statistically analyzed using two way analysis of variance (ANOVA) and Tukey's post hoc test. Results: Two way ANOVA revealed significant differences for the factors of dentin adhesives and composite resins, and significant interaction effect (p < 0.001). All combinations with Xeno V (Dentsply De Trey) and Clearfil $S^3$ Bond (Kuraray Dental) adhesives showed no significant differences in micro-shear bond strength, but other adhesives showed significant differences depending on the composite resin (p < 0.05). Contrary to the other adhesives, Xeno V and BondForce (Tokuyama Dental) had higher bond strengths with the same manufacturer's composite resin than other manufacturer's composite resin. Conclusions: Not all combinations of adhesive and composite resin by same manufacturers failed to show significantly higher bond strengths than mixed manufacturer combinations.

• The Journal of the Convergence on Culture Technology
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• v.10 no.4
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• pp.193-199
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• 2024

The purpose of this study was to confirm the relationship between self-esteem, family strength, and awareness of support for the elderly among college students, and to identify factors that affect awareness of support for the elderly. The participants of the study were 131 college students, and data was collected using a structured questionnaire from March 26 to April 11, 2024. Data analysis was performed using Independent t-test, One way ANOVA, Pearson's correlation coefficients, and multiple regression analysis. The results of the study showed a positive correlation between self-esteem and family strength (r=.49, p<.001), and between family health and awareness of support for the elderly (r=.30, p<.001). Factors that influence the participant's awareness of support for the elderly are age (β=-.18, p=.029), sibling status (β=.18, p=.027), and family strength (β=.26, p=.002). Based on the results of this study, it is necessary to have college students actively participate in programs related to the elderly so that they can have a positive attitude toward the elderly and establish correct values through continuous interaction with the elderly.

• The Journal of Korean Academy of Prosthodontics
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• v.44 no.6
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• pp.683-689
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• 2006

Statement of problem. Interfacial toughness is important in the mechanical property of layered dental ceramics such as core-veneered all-ceramic dental materials. The interfaces between adjacent layers must be strongly bonded to prevent delamination, however the weak interface makes delamination by the growth of lateral cracks along the interface. Purpose. The purpose of this study was to determine the effect of the reaction layer on the interfacial fracture toughness of the core/veneer structure according to the five different divesting. Materials and methods. Thirty five heat-pressed Lithia-based ceramic core bars (IPS Empress 2), $20mm{\times}3mm{\times}2mm$ were made following the five different surface divesting conditions. G1 was no dissolution or sandblasting of the interaction layer. G2 and G3 were dissolved layer with 0.2% HF in an ultrasonic unit for 15min and 30 min. G4 and G5 were dissolved layer for 15min and 30min and then same sandblasting for 60s each. We veneered bilayered ceramic bars, $20mm{\times}2.8mm{\times}3.8mm$(2mm core and 1.8mm veneer), according to the manufacturer's instruction. After polishing the specimens through $1{\mu}m$ alumina, we induced five cracks for each of five groups within the veneer close to interface under an applied indenter load of 19.6N with a Vickers microhardness indenter. Results. The results from Vickers hardness were the percentage of delamination G1:55%, G2:50%, G3:35%, G4:0% and G5:0%. SEM examination showed that the mean thickness of the reaction layer were G1 $93.5{\pm}20.6{\mu}m$, G2 $69.9{\pm}14.3{\mu}m$, G3 $59.2{\pm}20.2{\mu}m$, G4 $0.61{\pm}1.44{\mu}m$ G5 $0{\pm}0{\mu}m$. The mean interfacial delamination crack lengths were G1 $131{\pm}54.5{\mu}m$, G2 $85.2{\pm}51.3{\mu}m$, and G3 $94.9{\pm}81.8{\mu}m$. One-way ANOVA showed that there was no statistically significant difference in interfacial crack length among G1, G2 and G3(p> 0.05). Conclusion. The investment reaction layer played important role at the interfacial toughness of body ceramic bonded to Lithia-based ceramic.

• Journal of the Daesoon Academy of Sciences
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• v.17
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• pp.93-112
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• 2004

This article examines the process of how Daesoon thought keeps its own identity while being practiced as a religion in Korean culture through the perspective of theological hermeneutics of E. Schillebeeckx, a representative theologian in 20th century, especially on the centering of the matter of experience. Schillebeeckx says that an experience is an occurrence of perception by encountering something different from oneself. According to him, 1) the occurrence of perception is premised on a framework or form of interpretation which prescribes experience as the experience in the perceptive dimension. 2) A framework of interpretation is subject to pre-existing system or structure which already has formed a basis to the experience. It consists of various interpretative elements such as social form, general knowledges, various experiences, theoretical models in their society, etc.. 3) The experiences take place in the reflection of contemporary situation, and it is understood by a society, thus making it a social stream. This experience is expressed historically, gains historicity in the process of being handed down from person to person, from generation to generation. In this way, an experience starts to form a tradition. 4) The tradition is a historical stream which gives rise to, admits, and integrates various experiences, religious revelation, and faith etc. In this way, the tradition as a historical stream becomes a field of religious actuality such as revelation, salvation, etc. Conclusively, a religion takes place, is formed, only when it is understood anew by the people who live in that cultural tradition through their languages. The ground Daesoon thought takes place, is formed, is in this way. Daesoon thought takes place in the core of traditional Korean culture, undergoes changes when it encounters the other stream of traditional Korean culture, and the vice versa. Because of this inevitable change, ironically enough, Daesoon thought can maintain its own identity as Daesoon thought, and Korean culture its own identity as Korean culture, avoiding falling into the tertiary which is neither Daesoon thought nor Korean culture. It is in this way that any religion can be in the faithfulness to its starting point to be enriched and transformed in its interaction with the other tradition. At here is the reason Daesoon thought has to have an openness to the changing world.

• Restorative Dentistry and Endodontics
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• v.32 no.1
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• pp.28-36
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• 2007

The purpose of this study was to compare the effect of exponential curing method with conventional curing and soft start curing method on polymerization shrinkage of composite resins. Three brands of composite resins (Synergy Duo Shade, Z250, Filtek Supreme) and three brands of light curing units (Spectrum 800, Elipar Highlight, Elipar Trilight) were used. 40 seconds curing time was given. The shrinkage was measured using linometer for 90 seconds. The effect of time on polymerization shrinkage was analysed by one-way ANOVA and the effect of curing modes and materials on polymerization shrinkage at the time of 90s were analysed by two-way ANOVA. The shrinkage ratios at the time of 20s to 90s were taken and analysed the same way. The results were as follows : 1. All the groups except Supreme shrank almost within 20s Supreme cured by soft start and exponential curing had no further shrinkage after 30s (p < 0.05). 2. Statistical analysis revealed that polymerization shrinkage varied among materials (p = 0.000) and curing modes (p = 0.003). There was no significant interaction between material and curing mode. 3. The groups cured by exponential curing showed the statistically lower polymerization shrinkage at 90s than the groups cured by conventional curing and soft start curing (p < 0.05). 4. The initial shrinkage ratios of soft start and exponential curing were statistically lower than conventional curing (p < 0.05). From this study, the use of low initial light intensities may reduce the polymerization rate and, as a result, reduce the stress of polymerization shrinkage.

• Journal of KIISE:Software and Applications
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• v.37 no.1
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• pp.80-84
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• 2010

Tracking hands is an essential technique for hand gesture recognition which is an efficient way in Human Computer Interaction (HCI). Recently, many researchers have focused on hands tracking using a 3D hand model and showed robust tracking results compared to using 2D hand models. In this paper, we propose a novel 3D hand tracking method based on a coupled particle filter. This provides robust and fast tracking results by estimating each part of global hand poses and local finger motions separately and then utilizing the estimated results as a prior for each other. Furthermore, in order to improve the robustness, we apply a multi-cue based method by integrating a color-based area matching method and an edge-based distance matching method. In our experiments, the proposed method showed robust tracking results for complex hand motions in a cluttered background.