• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.3 no.2
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• pp.17-23
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• 1996

Packaging trays were manufactured with recycled newspaper and rice straw to investigate the effect of mixing ratio of rice straw pulp on physical properties of the trays. The apparent density of the trays increased gradually with increasing mixing ratio of rice straw pulp and the bursting strength increased at the mixing ratio of above 40%. The results showed that the trays made from 100% rice straw pulp had the highest bursting strength and the trays with the mixing ratio of 20% and 100% had high compression strength. The air resistance of the trays decreased with increasing mixing ratio until 80%. As the mixing ratio of rice staw pulp in the trays increased, L value in color decreased and b value increased.

• Proceedings of the Korea Inteligent Information System Society Conference
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• 2002.05a
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• pp.294-301
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• 2002

The purpose of this research is to investigate the level of knowledge management in Korea small firms. The research scheme was experimented through a questionnaire survey answered by 150 firms. The research model was composed of five groups : 1) knowledge management and business strategic, 2) a culture and structure for knowledge management, 3) learning process and community 4) information technology to support knowledge management 5) a reward and performance measurement. The results of this research indicated that the level of knowledge management is different according to the characteristic of small firms. The result of the empirical analysis can be summarized as follows : First, the business culture for knowledge management is not performed pertinently. Second, the learning process for knowledge management and a reward and performance measurement is insufficient. Third, the characteristics of a firm should be considered for measuring the level of knowledge management.

• Korean Journal of Construction Engineering and Management
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• v.11 no.1
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• pp.151-159
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• 2010

Leadership is a critical factor for success or failure of an organization. Project managers in construction projects are 'field CEO' so their leadership affects performance of the projects. The objectives of this study is to evaluate the leadership of project managers and to analyse its major characteristics. The LBDQ(Leader Behavior Description Questionnaire) technique was used to evaluate and identify types of leadership of project managers from 'heaven' and 'hell'. Relationships between leadership and performance of the projects were also discussed.

• Communications of Mathematical Education
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• v.26 no.1
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• pp.29-50
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• 2012

The purpose of this study is a comparison of proficient level and below basic level students' mathematical achievement in the National Achievement Evaluation and Assessment(NAEA). For the purpose, this study compared the proficient level and below basic level students' ratios, students' mathematical achievement of contents area and behavioral area in 6th, 9th, and 11th grades. This study found the change of proficient level and below basic level students' ratios, and the proficient level and below basic level students' characteristics on mathematical achievement of contents area and behavioral area in 6th, 9th, and 11th grades.

• Journal of Intelligence and Information Systems
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• v.8 no.2
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• pp.37-49
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• 2002

The purpose of this research is to investigate the level of knowledge management in Korea small firms. The research scheme was experimented through a questionnaire survey answered by 150 firms. The research model was composed of five groups : 1) knowledge management and business strategic, 2) a culture and structure for knowledge management, 3) learning process and community 4) information technology to support knowledge management 5) a reward and performance measurement. The results of this research indicated that the level of knowledge management is different according to the characteristic of small firms. The result of the empirical analysis can be summarized as follows : First, the business culture for knowledge management is not performed pertinently. Second, the learning process for knowledge management and a reward and performance measurement is insufficient. Third, the characteristics of a fm should be considered for measuring the level of knowledge management.

• Journal of the Korean Society of Earth Science Education
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• v.3 no.2
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• pp.99-108
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• 2010

This study lays its purpose on examining the effects of lessons with the application of drawing tasks on changes in conception among gifted science students. The lesson with the application of drawing tasks means the lesson where students express key concepts regarding lesson subjects in drawings which are then applied to the lessons to develop conception among the learners. This study analyzed the effectiveness of lessons by comparing conception scores before and after experiments between an experiment group with the application of drawing tasks and a control group with normal lessons for the gifted in general for 8 months from March to October, 2008. In addition, the researcher examined how the effectiveness of the developed lessons show differently according to levels of meta-cognition, creative problem-solving abilities, and scientific inquiry skills among the gifted students. The results from this study are as the following. First, lessons with the application of drawing tasks were effective in changing conception among the gifted science students. It is possibly because in the process where one student compare his/her own drawings with the others' ones and discuss them, changes in conception occurred effectively among the learners. Second, it was revealed that lessons utilizing drawing tasks have equal effects on changes in conception among both student groups irrespective of their levels of meta-cognition. Accordingly the lesson for changing perceptions utilizing drawing tasks developed in this study is a program which can be applied to all gifted science students in order to change conception among them. Third, lessons utilizing drawing tasks have the greatest effects on the gifted science students at a 'middle' level of creative problem solving abilities. Fourth, lessons utilizing drawing tasks have the greatest effects on the gifted science students at a 'middle' level of scientific inquiry skills. Putting these results together, it is thought that if lessons utilizing drawing tasks are applied to gifted science students, not only their concepts would be changed effectively but also their attitudes toward science would be changed positively.

• Management & Information Systems Review
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• v.37 no.2
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• pp.149-167
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• 2018

The purpose of this study is to analyze the performance of Virtual Desktop Infrastructure(VDI) adoption. VDI performance was measured by IS manager (system quality, security, and managerial operation) and business user (usability, access, and user satisfaction). The survey questionnaires were developed for measuring VDI performance. 84 data samples were collected from the companies that had adopted cloud-based VDI. This research model was verified by Smart-PLS and SPSS. The research findings were as follows: First, the companies using VDI experienced actual performance, but they did not attain their expectation. Second, as results of comparing between IS managers and business users, IS administrators had considerably higher performance than business users, which indicates that there were big differences in performance perception among users. Compared with prior research such as technical trend, system construction, and performance improvement, this study has the following implications. First, by comparing the expected performance with the actual performance of the companies that have implemented and operating VDI, it was suggested how a company that wants to adopt VDI can manage the expectation level of VDI and achieve higher actual performance. Second, because the perception of VDI performance differs between business users and system managers, it is meaningful that a fair evaluation of VDI performance requires a balanced consideration of business users and system managers.

• Nuclear Engineering and Technology
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• v.24 no.1
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• pp.98-109
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• 1992

In this study uniaxial cyclic loading tests were performed on Cheon-Ho Mt. Limestone specimens to investigate the fatigue failure behavior. The loading rate was kept constantly at 760kg/$\textrm{cm}^2$/sec under cyclic loading. In order to reveal the fatigue behavior for each rock type, the test results were mutually compared with previous studies carried out on Indiana Limes-tone and Seong-Ju Sandstone. Fatigue data is presented in the form of S-N curves, which illustrate the relationship of maximum applied stress(S) to the number of cycles(N) required to produce failure. For the purpose of comparing the S-N curves for each rock type, the test data were formulated up to 10$^4$cycles and the correlation coefficients(R) on Cheon-Ho Mt. Limestone and Seong-Ju Sandstone specimen are 0.886 and 0.983, respectively. All three rock specimens were found to have shorter fatigue life at higher applied stress levels. The fatigue life for each rock type was considered as no less than 81.5, 70 and 74.8%, for Cheon-Ho Mt. Limestone, Indiana Limestone and Seong-Ju Sandstone, respectively. The comparison in static strength for monotonic loaded specimens and specimens which did not fail even after 10$^4$cycles indicated that the increasing rate of strength was about 6.18 and 10.96% , for Cheon-Ho Mt. Limestone and Indiana Limestone, respectively. Poisson's ratio and volumetric strain for Cheon-Ho Mt. Limestone and Seong-ju Sandstone, tended in all the cases to rapidly increase at higher stress levels and with an increase in number of cycles. This increasing trend becomes rapid and obvious just before failure. Also Poisson's ratio and volumetric strain for each stress level were compared and analyzed at the first cycle and the cycle prior to failure.

• Journal of Gifted/Talented Education
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• v.23 no.3
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• pp.335-354
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• 2013

The purpose of this study was to investigate cognitive development and logical thinking formation levels of elementary gifted students and to compare with those of elementary regular students. For this purpose, 79 gifted elementary school students and 114 regular elementary school students in Kyunggi Province were participated, and GALT(Group Assessment of Logical Test) was administered to them. The results obtained in this study were as follows. First, the logical thinking scores of elementary gifted students were significantly higher than general students'(p<.05). Comparing the distribution of cognitive development level, elementary gifted students showed higher ratio in formal operation and lower ratio in concrete operation compared to the general students. It was interpreted that the cognitive development of gifted students preceded general students'. Second, analyzing according to the grade of elementary gifted students, logical thinking scores were significantly different between 5th graders and 6th graders(p<.05). Compared to 5th graders, logical thinking and formal operation ratio of 6th gifted graders showed significantly higher. The scores of four logical thinking areas except for conservational logic and correlational logic of 6th gifted graders showed significantly higher than 5th gifted graders'. Both 5th and 6th graders showed the highest formation ratio in combinational logic, and the lowest ratio in correlational logic. Third, logical thinking scores of gifted students according to gender did not show a significant difference(p>.05). The gifted boys reached formal operation more than gifted girls, but stayed more in the concrete operation. There was gender difference in correlational logic. The gifted girls showed significantly higher than gifted boys in correlational logic(p<.05).

• Journal of Korean Society of Forest Science
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• v.110 no.4
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• pp.658-664
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• 2021

This study aimed to develop accurate status site index curves for C. japonica in Gyeongsang-do that reflect the regional characteristics. The development of high-growth models in Chapman-Richards, Schumacher, and Gompertz for 552 C. japonica growing in Gyeongsang-do. The Gompertz growth function is the most suitable for developing site index curves. The comparative test was analyzed using the F test at a significance level of 5% and the graph. As a result, compared with the national site index curves and site index curves under base age in Jeolla-do, the p-value was 0.05 or higher, and there was no statistically significant difference. The p-value was 0.05 or lower compared with site index curves over stand age in Jeolla-do, indicating a statistically significant difference. Therefore, it was determined that site index curves for C. japonica in Gyeongsang-do can be applied to the national site index curves and site index curves under base age in Jeolla-do, but not to site index curves over base age in Jeolla-do. Hence, based on the results of the study, it is possible to provide basic data on the forest management system for C. japonica in Gyeongsang-do and systematic and reasonable management through high field application reflecting regional characteristics.