• Journal of the Earthquake Engineering Society of Korea
• /
• v.20 no.1
• /
• pp.33-43
• /
• 2016

This study investigates the performance of hollow precast segmental bridge columns with reinforcement details for material quantity reduction. The proposed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. The precast segmental bridge columns provides an alternative to current cast-in-place systems. We tested a model of hollow precast segmental bridge columns under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis in Higher Evaluation System Technology (RCAHEST), for analysis of reinforced concrete structures. The used numerical method gives a realistic prediction of performance throughout the loading cycles for hollow precast segmental bridge column specimens investigated. As a result, proposed reinforcement details for material quantity reduction was equal to existing reinforcement details in terms of required performance.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.20 no.1
• /
• pp.21-31
• /
• 2016

This study investigates the seismic performance of new hollow reinforced concrete (RC) bridge piers with triangular reinforcement details. The developed triangular reinforcement details are economically feasible and rational, and facilitate shorter construction periods. We tested a model of new hollow RC bridge piers with triangular reinforcement details under a constant axial load and a quasi-static, cyclically reversed horizontal load. We used a computer program, Reinforced Concrete Analysis in Higher Evaluation System Technology (RCAHEST), for analysis of RC structures. The used numerical method gives a realistic prediction of seismic performance throughout the loading cycles for several hollow pier specimens investigated. As a result, developed triangular reinforcement details for material quantity reduction was equal to existing reinforcement details in terms of required performance.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.9 no.2
• /
• pp.246-256
• /
• 2002

Purpose: This study was conducted to investigate correlations between environmental characteristics and disturbing behaviors in elderly people with dementia living in institutions. Method: A random sample of 107 subjects in three institutions for people with dementia in the Gyeongnam Province was tested between May 29 and June 5, 2002. Data was collected through a questionnaire and analyzed using SPSS/PC Win 10.0 Result: The major findings of the study are as follows. 1) the mean score on physical environment was $3.55{\pm}0.47$, and on psychosocial environment, $3.55{\pm}3.08$. 2) the mean score on disturbing behaviors showed that nonaggressive psychomotor behavior was the highest, and aggressive psychomotor behavior was the lowest. 3) the disturbing behaviors. in 5 the domains correlated with the environment and influencing factors included environment, family, level of dementia and level of ADL. Conclusion: Both the present physical environment and psychosocial environment influence the type of disturbing behavior in elderly people with dementia. Therefore, nursing can reduce the disturbing behaviors through maintenance of both the psychosocial environment and the physical environment. Furthermore, nurses must consider disturbing behaviors of elderly people with dementia by being aware of the level of dementia and ADL.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.10 no.2
• /
• pp.78-86
• /
• 2006

This paper presents the performance test result of the 30-ton class turbopump turbine. Test has been conducted using high pressure cold air, The turbine overall performance has been measured for various pressure ratio and rotational speed settings. The nozzle-rotor clearance effect on turbine performance also has been tested for the four kinds of the nozzle-rotor clearance values. We found that turbine efficiency rated 51.1% at its design velocity ratio and pressure ratio of 13.5. We also found that turbine efficiency can be increased by 3.5% for approximately 1mm decrement of the nozzle-rotor clearance from its nominal value.

• Journal of Environmental Science International
• /
• v.15 no.10
• /
• pp.961-966
• /
• 2006

An algal assay procedure using an indigenous phytoplankton assemblage was tested to estimate the propagation of red tide phytoplankton species and determine the optimal time interval at which to measure growth yield in eutrophic marine waters where red tides frequently occur. Various red tide phytoplankton species were propagated on a large scale by adding nitrogen or phosphorous. This procedure was useful for estimating the limiting nutrient, elucidating the mechanisms underlying red tides, and determining the levels of increases in organic matter in eutrophic coastal waters. The algal assay using indigenous C. polykrikoides showed that this species did not always propagate, apparently because of very low concentrations of trigger elements that are necessary for its growth, rather than as a result of other environmental characteristics, e.g., water temperature or stress from sampling. In the winter, when water temperatures are lower than in spring, summer, or autumn, maximum propagation and the limiting nutrient could be estimated by measuring phytoplankton biomass at 2 - 3-day intervals. However, in the other seasons, when water temperatures are higher, phytoplankton biomass should be measured at 2-day intervals. In particular, daily monitoring will be required to determine precise growth yields in warm seasons.

• Journal of Korean Academy of Nursing
• /
• v.32 no.5
• /
• pp.684-693
• /
• 2002

This study was conducted to detect the correlations and the main factors influencing self-directedness in learning of nursing students. Method: The samples were composed of 224 nurse students who were from three nursing department in Seoul, Chungnam & Kyunbook. The reliability of 4 instruments was tested with Cronbach's $\alpha$ from .63 to .86. The data was analyzed using a SAS program for descriptive statistics, Pearson correlation coefficients and stepwise multiple regression. Result: The results were as follows: 1. The mean self-directedness score was 91.23 which was slightly high. The self-directedness in learning was influenced significantly by grade, perception of self-level, self-study in majoring and self-study except for majoring(F= 3.33-7.14, p<.05). 2. There were significant correlations between all the predictive variables and the self-directedness(r=.27-48, p<.01). 3. Stepwise multiple regression analysis showed that 35% of the self-directedness in learning of nursing students were significantly explained by self-esteem(23%), locus of control(6%), self-study except for majoring(2 kind, 2%), self study in majoring(good, 2%), and self-study except for majoring( above 3 kind, 2%). Conclusion: Based upon these findings, sociopsychological variables like self-esteem and locus of control are very important factor influencing self-directedness in learning of nursing students.

• Journal of Korea Game Society
• /
• v.14 no.5
• /
• pp.69-78
• /
• 2014

This paper analyzed motivations of early adaptor students in using G-Learning. Also, it has tested academic effectiveness in G-Learning process. As a result, it has found that early adaptor students prefer G-Learning for social relationship, following the trend and showing off to their colleagues. Furthermore, the students showed high academic motivation, which made them taking high performance in their subject.

• Child Health Nursing Research
• /
• v.10 no.3
• /
• pp.332-339
• /
• 2004

Purpose: To develop a tool to evaluate middle school sex education programs. Method: An evaluation tool was developed in 4 stages: first, preliminary items were developed based on the sex education guidebook for teachers published by the Korean Ministry of Education and Human Resources Development; second, a panel of specialists reduced the number of preliminary items by 3 validity tests on the contents; third, final items were selected from the results of pre-test. Finally, reliability and validity were tested by a sample of 601 middle school students of both genders attending all three grades. Result: The developed evaluation tool contained 31 items on the sexual knowledge and 22 items on the sexual attitude. The results of reliability tests were as follows: Cronbachs alpha for sexual knowledge was .84; and for sexual attitude was .88. Conclusion: This study suggested the developed evaluation tool for sex education programs for middle school students had a high degree of reliability and validity. Therefore, it can be utilized to effectively evaluate Korean middle school sex education programs.

• Culinary science and hospitality research
• /
• v.19 no.3
• /
• pp.18-32
• /
• 2013

This study attempts to 1) identify the dimensions of perceived value in the restaurant industry and 2) assess the effects of these dimensions on overall customer satisfaction and behavioral intent. With a total of 272 samples obtained from empirical research, this study reviews the reliability and fitness of the research model, and verifies a total of 4 hypotheses using the Amos program. The hypothesized relationships in the model were tested simultaneously using a structural equation model(SEM). The proposed model provided an adequate fit to the data:${\chi}^2$ 140.087(df 80), CMIN/df 1.751, RMR .060, GFI .937, AGFI .906, NFI .962, CFI .983, RMSEA .053. As a result of confirmatorical analysis, the quality value, emotional value and economical value were quantified as perceived value in fastfood restaurants. These factors were indicated to have influence on customer satisfaction and re-visit intention. Limitations and future research were also discussed.

• Journal of the Korean Ceramic Society
• /
• v.36 no.4
• /
• pp.333-342
• /
• 1999

This research was performed to investigate how the basic glaze change affected colour development at high temperature with a stable colorant (spinel structure CoAl2O4 pigment) The compounded pigment which is widely used for porcelain was also tested for the basic glazes adaptability. The data from the test were recorded in a computer data-base program. Therefore could be easily used in the study related with a pottery field. CoO : Al2O3 system spinel pigment of barium glaze lime glaze zinc glaze lead glaze and talc glaze were chosen for this study. The colors of Cobalt blue bright blue, blue purple were seen at the wave lengths of 455-480nm at the firing temperature of 1250$^{\circ}C$. Stable color were obtained from lime glaze bar-ium glaze zinc glaze. All the information in the database were used to examine all the possible result of the test in the study of porcelain. When the test results database were examined in all temperature ranges the lack of adhesion with the pigment occurred at the temperature of 1150$^{\circ}C$. The lack of adhesion is seen due to vaporization of the lead glaze.