• Journal of Korean society of Dental Hygiene
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• v.16 no.3
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• pp.427-434
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• 2016

Objectives: This study aims to investigate the elements to affect the usage of individual oral hygiene devices in adults by the age group, to make the community inhabitants keep their healthy dental hygiene status, and to provide them with the educational materials for the dental hygiene and the basic data for the program development. The purpose of the study is to investigate the relation ot use of oral hygiene devices in the adults. Methods: The subjects were 9,073 adults from the sixth KNHANES from January, 2013 to December, 2014. The study consisted of questionnaire survey and direct physical examination. The questionnaire included genral characteristics of the subjects and oral health characteristics. The general characteristics consisted of subjective perception of health and chronic diseases. The oral health characteristics consisted of subjective oral health perception, dental caries, periodontal disease, annual oral examination, toothbrushing, prosthetics, implant surgery, and use of individual oral hygiene devices. Results: Those within 40 to 64 years old were the top users of oral hygiene devices. They perceived their dental hygiene was normal because they did not have periodontal disease but most of them had dental caries. They used oral hygiene devices three times a day and brushed teeth more than three times a day. They took annual dental checkup. Conclusions: It is necessary to promote the use of oral hygiene devices to prevent the dental caries and periodontal disease. The continuous training for the dental hygienists is very important because the dental hygienists is the first line of the prevention of dental caries and periodontal disease.

• Journal of Distribution Science
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• v.16 no.1
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• pp.7-15
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• 2018

Purpose - This study aimed to identify the impact of consumers' perception of the value of discount store PB products on brand loyalty and repurchase intention and simultaneously check whether consumers showed a different position depending on gender difference and age. Research design, data, and methodology - For data collection, total of 174 valid copies of questionnaire were obtained for analysis. And simple regression, multiple regression and hierarchical moderated regression analysis was conducted for hypothesis verification and implication Results - It was found that functional, social and emotional value perceived by consumers had a positive impact on brand loyalty and repurchase intention. And it was found that consumers who were in a relatively lower age group were positive, in the relation between emotional value and repurchase intention only. Conclusions - It was suggested that consumers accept discount store PB products positively overall. Therefore, discount stores must not only need to develop their strengths in various parts of PB product beyond consumer's positive perception but also make efforts to raise the social awareness of the use of PB products. And they have to promote consumer decision making by concentrating on emotional factors take a different approach to consumers in a higher age group.

• Journal of Institute of Control, Robotics and Systems
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• v.15 no.5
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• pp.519-524
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• 2009

This paper describes a new sensor system for 3D environment perception using stereo structured infrared light sources and a camera. Environment and obstacle sensing is the key issue for mobile robot localization and navigation. Laser scanners and infrared scanners cover $180^{\circ}$ and are accurate but too expensive. Those sensors use rotating light beams so that the range measurements are constrained on a plane. 3D measurements are much more useful in many ways for obstacle detection, map building and localization. Stereo vision is very common way of getting the depth information of 3D environment. However, it requires that the correspondence should be clearly identified and it also heavily depends on the light condition of the environment. Instead of using stereo camera, monocular camera and two projected infrared light sources are used in order to reduce the effects of the ambient light while getting 3D depth map. Modeling of the projected light pattern enabled precise estimation of the range. Two successive captures of the image with left and right infrared light projection provide several benefits, which include wider area of depth measurement, higher spatial resolution and the visibility perception.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.18 no.5
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• pp.1223-1237
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• 2024

Autonomous vehicles use onboard sensors to sense the surrounding environment. In complex autonomous driving scenarios, the detection and recognition capabilities are constrained, which may result in serious accidents. An efficient way to enhance the detection and recognition capabilities is establishing collaborations with the neighbor vehicles. However, the collaborations introduce additional challenges in terms of the data heterogeneity, communication cost, and data privacy. In this paper, a novel personalized federated learning framework is proposed for addressing the challenges and enabling efficient collaborations in autonomous driving environment. For obtaining a global model, vehicles perform local training and transmit logits to a central unit instead of the entire model, and thus the communication cost is minimized, and the data privacy is protected. Then, the inference similarity is derived for capturing the characteristics of data heterogeneity. The vehicles are divided into clusters based on the inference similarity and a weighted aggregation is performed within a cluster. Finally, the vehicles download the corresponding aggregated global model and train a personalized model which is personalized for the cluster that has similar data distribution, so that accuracy is not affected by heterogeneous data. Experimental results demonstrate significant advantages of our proposed method in improving the efficiency of collaborative perception and reducing communication cost.

• Asian Journal for Public Opinion Research
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• v.8 no.3
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• pp.297-323
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• 2020

The relationship between compliance with behaviors recommended to prevent the spread of COVID-19 and media exposure, negative emotions, and risk perception was examined using regression analyses of data from KAMOS, a nationally representative survey of South Korean adults. The strongest predictor of preventive behaviors in general was negative emotions, which had the largest βh (.22) among the independent variables considered. The eight negative emotions, identified using factor analysis of a series of 11 emotions, were anger, annoyance, fear, sadness, anxiety, insomnia, helplessness, and stress. Negative emotions themselves were influenced most strongly by the respondent's anxiety over social safety (βe=.286), followed by prediction of COVID-10 spread (β=.121, p<.001) and perceived risk of COVID-19 infection (β=.70, p=.023). Females (β=-.134) and those who felt less healthy (βo=-.097) experienced more negative emotions. Media exposure and increased media exposure both have significant relationships with negative emotions and both a direct and indirect impact on the adoption of preventive measures. Women, older people, and healthier people perceived greater risks and engaged in more preventive behaviors than their counterparts.

• Journal of the Korean Home Economics Association
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• v.45 no.4
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• pp.77-86
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• 2007

The purpose of this study is to explore the number and type of proverbs known by elementary school children and explain what variables might influence the proverbs' perception. From Seoul and Chonbuk areas, 632 forth, fifth, and sixth graders at elementary school participated. They completed an open-ended questionnaire asking them to list as many proverbs as they know and probing their experience in the use of proverbs with grandparents, parents, and peers. The results showed that the participants listed a total of 185 proverbs, at an average of six proverbs each, and that 63% were a concrete proverb consisting of only concrete and visible nouns. Children reported relatively different ratios of concrete/abstract/complex proverbs according to their grade. Sixth graders perceived more proverbs which included nouns than other graders. Multiple regression analysis revealed that children's grade and using proverbs with peers influenced their proverb perception. These results may suggest a possibility of relationship between figurative language and cognitive development related to thinking of late school-age children.

• Journal of the Korean Society of Safety
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• v.28 no.1
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• pp.18-23
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• 2013

The purpose of this study were to develop and validate a prototype slipmeter used on-site floor. The developed slipmeter was dreg sled type. It measured static coefficient of friction(SCOF). The developed slipmeter was evaluated with ASTM 2508-11 which use four different standard surfaces(polished granite, glazed porcelain, vinyl composite tile, and ceramic tile). The SCOF was then measured with developed slipmeter under the three different contaminants and seven different floors. The test results of slipmeter were also compared with those of BOT-3000, floor surface roughness, and human perception. The test results revealed that developed slipmeter successfully ranked all four standard surfaces and differentiated among standard surfaces with varying degrees of slipperiness. The developed slipmeter couldn't properly measure slipperiness under the two kind of floors(polished tile, ground steel plate) and one kind of contaminant(glycerol). The test results of developed slipmeter had stronger correlation with those of BOT-3000 and floor roughness under the water and detergent solution than under the glycerol. The test results of developed slipmeter also showed stronger correlation with those of BOT-3000 and surface roughness than those of human perception. The newly developed slipmeter had been found to give consistent results under the test conditions except for two kind of floors(polished tile, ground steel plate) and one kind of contaminant(glycerol).

• Journal of Digital Contents Society
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• v.18 no.3
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• pp.517-524
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• 2017

The aim of this study was to provide basic contents which are based on the appropriate understanding, use, and information of smart devices for young children. The researcher surveyed mothers regarding the effects of their children's development as a result of using smart devices. A survey of 134 mothers with three to five-year-old children currently attending daycare centers or kindergartens was carried out. By using SPSS 18.0, the collected data of survey results was implemented via t-test and F verification. Study findings are as follows: First, the result of the survey analysis indicated that most mothers perceived that using smart devices did not heavily influence their child's development. Second, the mothers' perception was varied depending on whether it was their child's the first time using smart devices, the mother's education level, and on the mother's employment situation. However, there was no difference of perception in regards to gender. The results of this study suggest the necessity of parental intervention and prevention of side effect of children 's smart device use and parent education program.

• Journal of Digital Convergence
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• v.9 no.4
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• pp.245-252
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• 2011

This study review about smart work to appear the use of smart device, and find the management plan for activating of smart work. Our national's smart work that is the best internet environment in worldwide fall behind foreign country. This study offers for the activating strategies of smart work. Fist, it is to change perception about smart work. Second, it should be clear up legal definition and category of smart-work. Third, it is that tighten up security of smart equipment. It is hard to achieve effects, as long as we get used to face-to-face work processing. Based on accurate perception about smart work on both employees and manager, this study suggest that it is important to change perception and to make actively use of smart work.

• International Area Studies Review
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• v.16 no.1
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• pp.175-195
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• 2012

Until now, many researches related to Korean Wave were focused on China and Japan. So, this study extend a scope of research about Korean Wave to Uzbekistan. Especially, we focused on relationship of perception on Korean Wave, self-congruity, attitude on Korean entertainment products and attitude on Korean consumer products. In conclusion, the 6 hypotheses were all supported. It was verified that self-congruity and attitude on Korean entertainment products is the very important factor. That is to say, we find that these two factors have a mediating role between perception on Korean Wave and attitude on Korean consumer products. This study's results are can use to raise Korean wave storm in Uzbekistan. Also, companies can use to improve its sale through a our study's results.