• Journal of Biosystems Engineering
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• v.21 no.4
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• pp.429-435
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• 1996

A wind tunnel consisting of two air flow conditioners with polycarbonate pipes, a plant growth room, a suction fan and fan controller, and fluorescent lamps, was designed to investigate the interactions between the growth of plug seedlings under artificial light and their Physical environments. Light transmissivities in the plant growth room based on the photosynthetic photon flux density and photosynthetically active radiation was appeared to be 96.3% and 96.8%, respectively. Measurement showed a uniformity in the vertical profiles of air current speed at the middle and rear regions of plug trays in wind tunnel. This result indicated that the development of a wind tunnel based on the design criteria of the American Society of Mechanical Engineers was adequate. Air current speed inside the plug stand was significantly decreased due to the resistance by the leaves of plug seedlings and boundary layer developed over and below the plug stand. Driving force to facilitate the diffusion of gas inside the plug stand might be regarded as extremely low. Aerodynamic characteristics above the plug stand under artificial light were investigated. As the air current speed increased, zero plane displacement decreased but roughness length and frictional velocity increased. Zero plane displacement linearly increased with the average height of plug seedlings. The wind tunnel developed in this study would be useful to investigate the effects of air current speed on the microclimate over and inside the plug stand and to collect basic data for a large-scale plug production under artificial light in a semi-closed ecosystem.

• Journal of the Korean Society of Physical Medicine
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• v.11 no.2
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• pp.115-121
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• 2016

PURPOSE: Many studies have reported the improvement of cognition through physical activity among subject with dementia. This study aimed to whether the current studies supports that physical activity intervention is efficacious on cognitive performance in subject with dementia. METHODS: Two independent reviewers searched National assembly library, RISS, KISS (2005-2015) using the concepts of dementia, exercise, and physical activity. We included randomized controlled trials that examined the efficacy of physical activity in subject with dementia. A meta-analysis was performed to estimate the effect sizes cognition with CMA (Comprehensive Meta-Analysis, version 2.2.064) soft-ware program. Nine randomized controlled trials were included, providing data from 133 individuals and excluding those failing to criteria of this study. RESULTS: The meta-analysis showed that physical activity intervention had a rather small effect sizes of 0.36 (95% confidence interval 0.14-0.59) on cognition performance in subject with dementia. Outcome measurement were MMSE-K (Mini-mental state examination Korean version) and LOCTA (Loewenstein Occupational Therapy Cognitive Assessment). We found heterogeneous among studies and there was difference between the studies (Q = 19.63, d(f)=12, $I^2= 38.88$). CONCLUSION: The present analysis suggests that physical activity interventions have the low effect sizes on cognition performance in subject with dementia Further studies will be required to develop the various programs for improving the cognitive performance in subject with dementia.

• Journal of Preventive Medicine and Public Health
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• v.32 no.4
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• pp.427-434
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• 1999

Objectives: This study was conducted to determine, by reviewing the literature, whether treatment of Helicobacter pylori infection in patients with non-ulcer dyspepsia affects symptoms. Methods: We retrieved the literature using MEDLINE search, with nonulcer dyspepsia and Hericobacter pylori and treatment as key words, which were reported from 1984 to 1998, and manual literature search. The criteria for inclusion was as follows; 1) The paper should have confirmed nonulcer dyspepsia as case definition. 2) The paper should have peformed a randomized, blind trial. 3) Confirmation of Helicobacter pylori eradication should be done 4 weeks after treatment. 4) studies with no information on measurement of symptoms after treatment were not accepted. The percentage of patients with symptom improvement after eradication therapy for Helicobacter pylori infection was calculated. Cumulative odds ratio was compared by fixed effect model and random effect model as sensitivity and funnel plot was used to evaluate publication bias. Results: The overall effect size of symptom improvement was calculated by cumulative odds ratio. Cumulative odds ratio of random effect model was 4.16(95% CI: 1.55-11.19). Before integrating each effect sizes into common effect size, the homogeneity test was conducted and random effect model was selected(Cochran's Q=41.08 (d.f=10, p<0.001)). The heterogeneity across studies was evaluated and the different methodological aspects of studies led to differences between study results Conclusions: The results suggest that the eradication of Helicobacter pylori in patients with non-ulcer dyspepsia results more symptom improvement. In studios that shows the opposite results there are methodological aspects explaining the heterogeneity.

• Journal of radiological science and technology
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• v.41 no.4
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• pp.351-360
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• 2018

In recent years, demand for examination of bone mineral density (BMD) is increasing in Korea according aging society. Therefore, it is required to develop an efficient management program that can increase the safety and reliability of Dual Energy X-ray Absorptiometry (DXA) that can be applied to the criteria of the World Health Organization. It is necessary to develop a management program that can design a program to improve the accuracy and precision of the results of the analysis and to improve the accuracy of diagnosis of osteoporosis by development a high quality DXA report. It is recommended to prepare the examination manuals and to establish procedures of standard operating including the program to prevent the pitfalls during the examination, the compatibility evaluation of the examination data, and the contents of the radiation safety. In addition, relevant regulations on the production of high-quality DXA reports are required and government and related agencies should introduce individual and facility recognition programs through DXA measurement and education programs and training. It is considered that efforts should be made to prepare high quality DXA report by guidelines on all aspects of BMD for preparation about aging society.

• Journal of Korean Society of Water and Wastewater
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• v.22 no.1
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• pp.39-48
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• 2008

This study was carried out to investigate the characteristics of the pollutant discharge from non-point source and to estimate the unit loads of the pollutant discharge from the upper watershed of Seomjin Dam during rainy season. The upper watershed of Seomjin Dam is located in the middle of Jeonbuk province is formed two tributaries mainly. A sub-branch stream of those tributaries is Imsil stream of which flow rate is about 13% of the main stream of Seomjin reservoir normally. On the basis of measurement result in this study, the water quality of Imsil stream was fluctuated highly and the quantity of measured pollutant discharge was higher than the value calculated with the proportion of flow rate during dry season. On the contrary, during rainy season the mean values of flow rate and water quality were higher than the quartile according to the statistical analysis. That means rainfall can influence strongly on the water quality of the upper watershed of Seomjin reservoir. Among the several criteria of water quality, SS discharge was most sensitive to the flow rate variation of stream, which was fluctuated in proportion of rainfall, basically. It was evaluated the event mean concentration (EMC) of non-point source pollutants depending on rainfall events as well. Though the pollutant discharge unit of Imsil stream was lower than the main stream of Seomjin reservoir, the EMC value of Imsil stream was higher than the main stream of Seomjin reservoir.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.05a
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• pp.141-147
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• 2005

Usually, processing whole project or a part of frame work delays due to acceleration, changing orders, management, characters of project. overtime, worker crowding, early occupation in the field of construction. Through a whole project, these factors cause decreasing construction labor-productivity which is the most dependent in business of construction. These kind of decreasing of construction labor-productivity cause many negative effects, just as extension of time, increasing cost in project of construction. Regardless of characters of construction or decreasing labor-productivity, extension of time is a incident which needs acceleration, also it cause a high possibility of claim and dispute. The productivity has just a broad meaning in business of construction. That's why it's difficult to apply in the field of construction. Especially, factors increasing or decreasing labor-productivity is defined by analysis of working as qualitative and outlined evaluation. However, study of the each factor decreasing construction labor-productivity analysis has not researched, because of difficulty of systematic measurement and management. The existed studies about management of productivity are just focused on estimation of productivity, not on evaluation of productivity. It was true that I couldn't examine clearly about the analysis of how much important per each the factor which have influence on labor-productivity because of the characteristic as qualitative that the labor productivity have On this study, i tried to get the factors decreasing of labor- productivity with gathering opinions of panels of expert's studies about the factors decreasing of labor-productivity on project of construction through Delphi method and i evaluated the result factors as quantitatively and subjectively about importance of factors decreasing construction labor-productivity Analysis, using AHP Method by Saaty. Also, using Delphi and AHP method, 1 suggest substantiated method qualitative factors are measured by quantitative criteria.

• Journal of Engineering Education Research
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• v.14 no.1
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• pp.74-81
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• 2011

In this paper, the author researched to enhance course outcomes while increasing the interest in engineering design through the 'Introduction to Engineering Design Course'. Deviating from the current practice of engaging in content-oriented lectures, the redesign of the weekly lecture has been conducted with a focus on learning achievement in order to enhance design competency, teamwork and communication skills, which are the goals of the PO3, PO6 and PO7, respectively. Moreover, assessment tools have been developed according to learning achievement, and rubrics, the measurement criteria, have been defined according to the respective assessment tools, along with course goals for learning achievement and results analysis. To enhance course learning achievement, as well as to induce interest in and satisfaction with the 'Introduction to Engineering Design Course', a design project utilizing a Boe-Bot robot has been carried out. An evaluation on learning achievement and lecture has identified an increase in learning achievement and interest in design in comparison with that of previous lectures.

• Journal of Korean Biological Nursing Science
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• v.13 no.2
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• pp.81-93
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• 2011

Purpose: This study was conducted to analyze the articles published in the Journal of Korean Biological Nursing Science from 1999 when it began to 2010. Methods: One hundred seventy eight articles were reviewed using analysis criteria developed by the researchers. Results: Thirty-one percent of the research was supported financially. The most used key concepts were in the health and environment domain. For study design, experimental studies were 50.56%, especially quasi-experimental design was most frequently used (22.47%). Selection of subjects by convenience sampling was most frequent (82.58%). The major subjects of study were adult patients (25.68%). Forty-eight percent of the research had verbal consent and 11% had written consent from the participants. Exercise was common intervention (27.87%) in experimental studies. Physiologic indicators (31.65%), cognitive indicator (25.38%), psychosocial indicator (13.21%) and physical indicator (7.31%) were frequently used as a measurement tool. For data analysis, descriptive statistics (28.99%), t-test (15.06%), chi-square test (11.69%) and ANOVA (9.89%) were most frequently used. Conclusion: The number of research papers published in the Journal of Korean Biological Nursing Science has increased. Research topics varied and were mostly conducted on the basis of logical positivism. Further research should be more empirical enough to be utilized in an actual nursing care context.

• Journal of the Korea Convergence Society
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• v.11 no.6
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• pp.433-440
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• 2020

This study comprehensively reviewed and summarized the research on the qualitative assessment tools of elderly leisure activities. 232 papers were searched in three databases, domestic and foreign, and nine were selected to meet the selection criteria. Five out of nine studies (55.5%) have been written in the last five years and have been implemented in six countries. As for the number of questions in the evaluation tool, 20 to 40 items were the most with 6 studies (66.6%), and 7 out of 9 studies used a 3-7 point Likert scale. There were a total of 37 variables related to leisure activities, and the most variables related to mental. Previously developed evaluation tools were biased toward the measurement of specific variables or did not fit the domestic situation. In the future, various variables of leisure activities for the elderly can be measured qualitatively, and a wide range of instruments that reflect the characteristics of the elderly in Korea should be developed.

• Journal of the Korea Fashion and Costume Design Association
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• v.13 no.4
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• pp.51-67
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• 2011

The purposes of this study were to segment male university students on the basis of benefit sought in clothing, and to investigate knitwear image preference and purchasing behaviors of each segmented market. The research method was a survey and subjects were 249 male university students in Daejeon and Chungnam province. The questionnaire consisted of measurement items for benefit sought in clothing, knitwear image preference, knitwear purchasing behaviors, and subject's demographic attributions. The data were analyzed by Cronbach's ${\alpha}$, factor analysis, cluster analysis, ${\chi}^2$ test, ANOVA and Scheffe test. The results were as follows. First, male university students were segmented into 6 consumer types (practicality pursuit, individuality pursuit, comport pursuit, brand pursuit, social status pursuit, and unconcern type) by benefit sought in clothing. Second, male university students generally preferred dandy image and causal image, however, brand pursuit type more preferred trendy image, and practicality pursuit type more preferred active image than other consumer types. Third, the segmented markets showed many differences on knitwear purchasing behaviors. On clothing selection criteria, practicality pursuit type considered resonable price as important, whereas brand pursuit type considered brand reputation. On fashion information source, individuality pursuit type considered store display and other people's clothing, while unconcern type considered advice from friend and family. On main purchasing place, individuality pursuit type more used speciality store with no brand, whereas brand pursuit type more used department store and brand store than other consumer types. The results of this study supported that benefit sought in clothing can be useful as an effective variable for market segmentation.