• Journal of the Korean housing association
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• v.21 no.5
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• pp.51-61
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• 2010

The purpose of this study is to suggest the basic data on the direction of housing research trends by dividing both research methods and research contents through precedent studies related to elderly housing. We drew four major conclusions through this research. First, in general, the research activities for elderly housing has been conducted actively since 2000 to begin in earnest after 1990. This result shows that it is related with the reform of welfare laws for the elderly in 1993, with the change of government policies and the increase of social interest in elderly people's lives. Second, early studies had been started to focus on elderly home residents if we look into research results according to research methods. In 1993, The Elderly Welfare Act was reformed by the government and then researches for elderly welfare facilities were also increased by a permission of government to run private elderly welfare facilities for making profit. This movement caused to expand research targets from general elderly people to their families, facility staffs and experts. Third, in case of research contents past studies were mostly conducted on the space planning and its actual situation. However, current studies are made under diverse viewpoint with the increase of elderly housing and elderly welfare facilities according to reforms of laws and changes of resident's perception. Fourth, because of rapid transition to an aging society the studies of elderly housing were influenced by the changes of policies and social consciousness.

• Journal of the Korean Society for Library and Information Science
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• v.15
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• pp.175-195
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• 1988

Use studies of library collections have been conducted as a method of evaluating collections in a library. The main purpose of use studies is to evaluate the quality of a library collection in terms of extent and mode of its use. In addition to use studies, both quantitative and qualitative methods could be utilized in order to evaluate a library collection. However, the quantitative and qualitative collection evaluation methods are more concerned with the collection itself than with its use. Use studies have been conducted in large academic libraries for the following specific purposes: 1) They attempt to identify little used portion of collections that can be retired less accessible and less expensive storage area. 2) They try to identify core collections to satisfy some degree of circulation demands in the near future. 3) They try to identify use patterns of selected subject areas or type of books that can be used to adjusting collection development practices or fund allocations. 4) They try to assess the document delivery capability of a library to improve their availability. A number of methodologies employed for these specific purposes fall into four major categories; 1) circulation analysis method, 2) last circulation method, 3) relative use method, and 4) document delivery test. Each method is briefly reviewed with its limitations.

• Journal of The Korean Society of Integrative Medicine
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• v.7 no.1
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• pp.135-144
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• 2019

Purpose : This study examines the relationship among nursing students' self-leadership, the maturity of their career attitudes, and satisfaction with their studies to investigate these elements' impact on nursing students' satisfaction with their major course of study. Methods : A total of 236 students enrolled in the College of Nursing were identified as potential research subjects. The study was conducted between October 1 and November 2, 2017. A structured questionnaire was used to investigate the students' self-leadership, the maturity of their career attitudes, and satisfaction with their major course of study. SPSS for Windows 20.0 was used for statistical analyses. Results : The study's results found an average score for self-leadership among nursing students was 3.61 out of 5, their average score for career attitude maturity was 3.14 out of 5, and the their average score for career attitude maturity was 3.14 out of 5, and the average satisfaction level was 3.79 out of 5. These results indicate that the students' levels of satisfaction with the major are higher when their levels of self-motivation are stronger. In addition, the motivation for application, self-motivation, and satisfaction with academic subjects had an influence on their satisfaction with the major, where the explanatory power was 32.7 %. Conclusion : Based on these results, the development of self-motivation and a curriculum that can improve students' satisfaction with their academic subjects is necessary to enhance nursing students' satisfaction with their major course of study.

• Korean Journal of Remote Sensing
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• v.36 no.4
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• pp.573-586
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• 2020

PM (particulate matter) is of interest to everyone because it can have adverse effects on human health by the infiltration from respiratory to internal organs. To date, many studies have made efforts for the prediction of PM10 and PM2.5 concentrations. Unlike previous studies, we conducted the prediction of tomorrow's PM10 concentration for the Air Korea stations using Chinese PM10 data in addition to the satellite AOD and weather variables. We constructed 230,639 matchups from the raw data over 3 million and built an RF (random forest) model from the matchups to cope with the complexity and nonlinearity. The validation statistics from the blind test showed excellent accuracy with the RMSE (root mean square error) of 9.905 ㎍/㎥ and the CC (correlation coefficient) of 0.918. Moreover, our prediction model showed a stable performance without the dependency on seasons or the degree of PM10 concentration. However, part of coastal areas had a relatively low accuracy, which implies that a dedicated model for coastal areas will be necessary. Additional input variables such as wind direction, precipitation, and air stability should also be incorporated into the prediction model as future work.

• Environmental Engineering Research
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• v.24 no.2
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• pp.279-288
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• 2019

To obtain insightful knowledge of geochemical process controlling fluoride enrichment in groundwater of the villages near Shilabati river bank, West Bengal, India, multivariate statistical techniques were applied to a subgroup of the dataset generated from major ion analysis of groundwater samples. Water quality analysis of major ion chemistry revealed elevated levels of fluoride concentration in groundwater. Factor analysis (FA) of fifteen hydrochemical parameters demonstrated that fluoride occurrence was due to the weathering and dissolution of fluoride-bearing minerals in the aquifer. A strong positive loading (> 0.75) of fluoride with pH and bicarbonate for FA indicates an alkaline dominated environment responsible for leaching of fluoride from the source material. Mineralogical analysis of soli sediment exhibits the presence of fluoride-bearing minerals in underground geology. Hierarchical cluster analysis (HCA) was carried out to isolate the sampling sites according to groundwater quality. With HCA the sampling sites were isolated into three clusters. The occurrence of abundant fluoride in the higher elevated area of the observed three different clusters revealed that there was more contact opportunity of recharging water with the minerals present in the aquifer during infiltration through the vadose zone.

• Tribology and Lubricants
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• v.40 no.1
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• pp.1-7
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• 2024

Ball bearings are a major component of mechanical parts for transmitting rotation. Compared to tapered roller bearings, ball bearings offer less rolling resistance, which leads to reduced heat generation during operation. Because of these characteristics, ball bearings are widely used in electric vehicles and machine tools. The design of ball bearing cages has recently emerged as a major issue in ball bearing design. Cage design requires pre-verification of performance using theoretical or experimental formula or computational fluid dynamics (CFD). However, CFD analysis is time-consuming, making it difficult to apply in case studies for design decisions and is mainly used in performance prediction following design confirmation. To use CFD in the early stages of design, main-taining analytical accuracy while reducing the time required for analysis are necessary. Accordingly, this study proposes a laminar steady-state segment CFD technique to solve the problem of long CFD analytical times and to enable the use of CFD analysis in the early stages of design. To verify the reliability of the CFD analysis, a bearing drag torque test is performed, and the results are compared with the analytical results. The proposed laminar steady-state segment CFD technique is expected to be useful for case studies in bearing design, including cage design.

• Journal of the Korean Association of Geographic Information Studies
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• v.2 no.2
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• pp.9-14
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• 1999

This paper describes an algorithm for the correction of major radiometric errors shown in MEIS (Multi-spectral Earth Imaging System) images on board KITSAT-3. MEIS images contain various radiometric errors as also shown in the images obtained from other remote sensing sensors. This paper introduces the two major radiometric error sources shown in MEIS images and the corresponding correction algorithm. The proposed algorithm was integrated to an operational preprocessing software and validated by applying the algorithm to several tens of MEIS images. This algorithm will therefore applied operationally to raw MEIS images before they are distributed to users.

• Korean Journal of Human Ecology
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• v.18 no.5
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• pp.985-994
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• 2009

This research is exploratory in considering the unique socio-cultural context of South Korea, where the present government is responding to the demand for English language training. The study asked the question: What do mothers experience when sending their young children to a private English institute, so called English kindergarten, instead of a regular preschool? A qualitative approach was used to analyze the in-depth interviews with 19 mothers who sent their young child to an English kindergarten. Mothers stated that their young child needs to be a competent English speaker. The mothers expected that an English kindergarten would prepare their child better for the elementary school English curriculum than a regular preschool. The study revealed that English kindergartens symbolized the precedence and the privileges of the elite because of their high tuition fees, native-speaker teachers, and small class sizes. The mothers showed a sense of pride and vicarious satisfaction from sending their child to an English kindergarten. However, the mothers recognized that English kindergartens put more emphasis on cognitive learning instead of the social development of children. It was almost impossible for mothers to communicate with the native-speaker teachers about their child. The mothers seemed to overlook their child's struggle to adapt to an English Kindergarten. The findings of the study raise issues concerning the boom of teaching young children English in Korea.

• Korean Journal of Child Studies
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• v.27 no.2
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• pp.153-165
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• 2006

This study examined moderating effects of mother's support and community environment on relationships between after school self-care and problem behaviors. Subjects were 579 3rd and 6th grade elementary school children. Major findings were positive relationships between after school self-care and problem behaviors. Neither gender differences nor grade differences were found in the relationships between after school self-care and problem behaviors. Moderating effects of care by relatives or neighbors on mother's support was shown in the relationships between after school self-care and internal problem behaviors. Moderating effects of proximity to harmful facilities were found in relationships between after school self-care and external problem behaviors.

• Journal of Korean Academy of Nursing Administration
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• v.9 no.1
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• pp.113-128
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• 2003

Purpose : The aim of this study is to review cost analysis methodological issues in the nursing literature. Method : The subjects of this study were articles published in Korea from 1961 to August, 2002. They were searched by key words 'cost' and 'nursing' from various DB(National Assembly Library, The National Library of Korea, RICH etc). Finally, 31 articles were collected. Results : 1) The major type of cost analysis was a cost comparison study. 2) The important methodological weaknesses were as followers: First, many studies did not describe a cost analysis framework or a cost analysis assumption. Second, a few studies described selection criteria of cost items and effectiveness items. Third, many studies did not do a sensitivity analysis. Conclusion : With these results, it will be possible to develop a more proper cost analysis methodological framework and also to make an evaluation criteria for cost analysis nursing study.