• Journal of the Computational Structural Engineering Institute of Korea
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• 제24권1호
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• pp.9-16
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• 2011

An approach to understand the phase distribution in a multi-phase polycrystalline material is important since it can affect material properties and mechanical behaviors. A proper method is needed to describe the phase distribution. For this purpose, contiguity and probability functions(two-point correlation and lineal-path functions) are investigated for representing the phase distributions of microstructures. The mechanical behaviors are evaluated using the finite element method. The characteristics of probability functions and mechanical reponses of virtual samples are represented. It is confirmed that the topology of phase clustering affects the mechanical behavior of materials and that the strength is reduced as the clustering size increases.

• Journal of Korean Academy of Nursing Administration
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• 제22권5호
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• pp.471-479
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• 2016

Purpose: This study was conducted to evaluate the level of safety climate, fatigue, and safety performance and to identify the impact of safety climate and fatigue on the safety performance of operating room nurses. Methods: The study design was a descriptive survey. Participants were 174 operating room nurses from two general hospitals and two university hospitals in S and D cities. Three structurally designed questionnaires were used to evaluate their safety climate, fatigue, and safety performance. Collected data were analyzed using descriptive analysis, t-tests, ANOVAs, Pearson correlation coefficient, and stepwise multiple regression. Results: Safety performance of operating room nurses had a mean of 3.26 on a 5-point scale. 'Current department career'(${\beta}=.17$, p=.006) and 'safety climate (work-unit contribution) (${\beta}=.63$, p<.001) accounted for 39% of the variance in operating room nurses' safety performance. Conclusion: Findings indicate that work-unit contribution towards safety climate is an important factor in increasing operating room nurses' safety performance. Therefore, it is essential to find motivational properties consistent with the characteristics of the operating room environment.

• Journal of the Korean Society of Clothing and Textiles
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• 제16권1호
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• pp.23-31
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• 1992

Mother's Clothing Behavior has a great influence on her daughter's Clothing Behavior. . Daughters are apt be influenced by their mothers in every respect and were greatly affected by the clothing behaviors of mothers to whom they pay their respect. From this point, this study is to examine the relationship between daughter's clothing behavior and their mother's clothing behavior. Two questionnaires were administered to 459 mother and 459 daughter selected from 4 universities in Seoul. The questionnaires were composed of two major categories: those for daughters and for mothers. Aspects of clothing behavior consist of seven variables such as modesty, decency, aesthetic, display, attention, fashion, conformity. For the analytical study on data, methods through coefficients of correlation, analysis of variance, multiple regression analysis were used. The results of this study were summerized as follows; There was significant relationship between daughter's clothing behavior and her mother's clothing behavior, i.e., Clothing behavior formation of daughter was most important influenced by mother's clothing behavior.

• Computers and Concrete
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• 제26권5호
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• pp.451-465
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• 2020

This paper presents experimental and numerical investigations on mechanical properties of ultra-high-performance fiber-reinforced concrete (UHPFRC) with four types of steel fibers; micro steel (MS), crimped (C), round crimped (RC) and hooked-end (H), in two fiber contents of 1% and 2% (by volume) and two lengths of 13 and 30 mm. Compression, direct tension, and four-point bending tests were carried out on four types of specimens (prism, cube, dog-bone and cylinder), to study tensile and flexural strength, fracture energy and modulus of elasticity. Results were compared with UHPC specimens without fibers, as well as with available equations for the modulus of elasticity. Specimens with MS fibers had the best performance for all mechanical properties. Among macro fibers, RC had better overall performance than H and C fibers. Increased fibers improved all mechanical properties of UHPFRC, except for modulus of elasticity, which saw a negligible effect (mostly less than 10%). Moreover, nonlinear finite element simulations successfully captured flexural response of UHPFRC prisms. Finally, nonlinear regression models provided reasonably well predictions of flexural load-deflection behavior of tested specimens (coefficient of correlation, R² over 0.90).

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• 제21권9호
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• pp.483-495
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• 2009

Feedwater heaters of many nuclear power plants have recently experienced severe wall thinning damange, which will increase as operating time progresses. Several nuclear power plants in Korea have experienced wall thinning damage in the area around the impingement baffle-installed downstream of the high pressure turbine extraction stream line-inside number 5A and 5B feedwater heaters. At that point, the extracted steam from the high pressure turbine is two phase fluid at high temperature, high pressure, and high speed. Since it flows in reverse direction after impinging the impingement baffle, the shell wall of the number 5 high pressure feedwater heater may be affected by flow-accelerated corrosion. This paper describes operation of experience and numerical analysis composed similar condition with real high pressure feedwater heater. This study applied squared, curved and new type impingement baffle plates to feedwater heater same as previous study. In addition, it shows difference of pressure distribution and value between single phase and two phase based on experience and numerical analysis.

• Journal of Korean Home Economics Education Association
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• 제8권1호
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• pp.11-21
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• 1996

The purpose of this study was to investigate the knowledge on nutrition, meal management and dietary intake of self-boarding highschool students. Total of 354 self-boarding students living in Ku-mi and Kim-chon, 182 males and 172 females, who cooks foods for oneself participated in this study. The data were collected through questionnaires and the results were summarized as follows： 1. Most subjects had adapted the lifestyle of self-boarding from the 1st grade of highschool, and half of them lived alone. About two-thirds of subjects visited their home once a week or more, and most of their boarding rooms were located at near the highschool they attended. 2. Their nutrition knowledge score was rather high with average 13.95 point out of possible 20. Female students got more points than male students. 3. In meal management, foods purchasing and sanitary control were managed quite well but meal planning and cooking were not managed well enough. In general, meal management score of female students were higher than those of male students. 4. About the dietary intake, female students took more various foods than male students as judged by foods intake frequency score. Two-thirds of subjects often skipped meals and only half of them always took boxed lunch. Also they depended too much upon processed and instant foods. 5. Meal management score showed significantly positive correlations with nutrition knowledge score and with foods intake frequency score. But the correlation between nutrition knowledge score and foods intake frequency score was not significant.

• The Transactions of the Korean Institute of Power Electronics
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• 제26권2호
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• pp.75-81
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• 2021

This study analyzes the resonance characteristics caused by the mutual interference between LCL filters and the grid impedance under the parallel operation of the grid-connected inverter using the LCL filter. These characteristics are verified through simulation and experiment. Two inverters are used to connect to the grid in parallel, and the system parameters, including the LCL filter, are set to the same conditions. In the case of inverters running in parallel at the point of common coupling, the presence of grid impedance causes mutual interference between the LCL filters of each inverter, and the deviation of the filter resonance frequency is analyzed to understand the parallel inverter. The correlation between the number of devices and the size of grid impedance is simulated by PSIM and verified by MATLAB. By connecting the real-time digital simulator Typhoon HILS to the DSP 28377 control board, the mutual interference characteristics are tested under the condition of two inverters running in parallel. The experimental and analysis results are the same, indicating the validity of the analysis.

• Journal of The Korea Institute of Healthcare Architecture
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• 제25권3호
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• pp.85-97
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• 2019

Purpose : The purpose of this study is to evaluate the remodeling effectiveness on old town in Songpa-Gu, Macheon-Dong in the point of elderly living. Methods : Main research method is interview with older residents living in Macheon-Dong. The surveyed district of old town is divided into two groups, one is experimental group and the other is control group. The interviews have been conducted two times; before the remodeling(September, 2017) and after the remodeling(May, 2019). Total number of questionnaire is about 400. Correlation analysis, T-test, regression analysis have been used for the interpretation of collected data. Results : The number of accident and road confusion of older residents in experimental group have been decreased after remodeling. Most preferred space is resting area, and older residents considers convenience and practicality as more important. 47.7% of respondents have evaluated dwelling site as good after remodeling. Implication : This study sends a meaningful message in that remodeling effect of old town has been analyzed quantitatively and dwelling area regeneration project of old town is positive for the improvement of dwelling environment.

• Journal of the Korean Home Economics Association
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• 제25권3호
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• pp.15-26
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• 1987

The purpose of this study was to develop the pattern drafting method which would be suitable to their physical characteristics for the fatty body of 40∼55 aged Korean women who are more than 1.5 Rohrer's Index and 90㎝ bust girth. The study was composed as follows; 1. Body measurement and statistical analysis: One hundred and thirty women were measured on 29 items. Thirty-four items including 29 measured items and 5 calcutated items were analyzed statistically. 1) Mean, standard deviation, variance, maximum, minimum, range were computed. 2) Correlation coefficients between each items were computed. 2. Development of new bodice pattern drafting method: Measurement items necessary to draft new bodice pattern were bust girth, center back waist length, shoulder width, back width, chest and neck base girth. The new pattern was examined through three wearing tests for completion. 3. Evaluation of the new pattern drafting method: The new pattern was objectively evaluated by the sensory test. The sensory evaluation was applied to evaluate the new pattern for the fatty body women by comparint it with the conventional patterns. The results of sensory tests of the new pattern are as follows: 1) The composite reliability coefficient is 0.7698, and the reliability of sensory test shows high. 2) According to a statistical analysis of the result of the 23 items on the questionaire, all the items showed significant differences(α 0.01) between the two, with the new pattern having higher scores. The new pattern is better conventional pattern as the average mark of the former is 3.901 but that of latter is 2.926. The new pattern drafting method proved to be superior to the conventional one especially in the fitness at the center front neck point, shoulder point, side line, armscye depth, position of bust point, chest width line, under arm dart and the shoulder line.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• 제10권1호
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• pp.129-137
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• 2015

Objectives : The purpose of this study is to find out the relation between Orthopedic Test of sacroiliac joint and two Sacrum Malposition Tests. Methods : We investigated 56 cases of patients who complained of unilateral sacroiliac joint pain and were diagnosed as sacrum malposition. We used Gaenslen's Test, Sacroiliac Resisted Abduction Test and Patric's Test as Orthopedic Test for pain area, while used Thompson's Sacrum Test and Greenman's 4 Point Test for diagnosis of sacrum malposition. Results : P-value was 0.511 between Thompson's Sacrum Test and Greenman's 4 Point Test within negative Orthopedic Test, and was 0.523 within positive Orthopedic Test(p>0.05) Conclusions : The results suggested that the Thompson's Sacrum Test was not statistically correlation with Greenman's 4 Point Test within negative Orthopedic Test, and was not correlated within positive Orthopedic Test.