• Korean Journal of Human Ecology
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• v.10 no.4
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• pp.349-355
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• 2001

The use of bed in Korea has increased steadily, however, intensive survey on the general use and consumer's evaluation of their beds have not been performed sufficiently, yet. Thus, the purpose of this study is to investigate the actual use of the consumer and their degree of evaluation for the component of the bed as well as their feeling of discomfort on the various parts of body. More than one hundred users of commercial beds were responded to the survey. The results obtained were as follows: (1) Complaint about the depression of the mattress and the noise from the bed was apparent in the current use of beds. (2) Important physical variable related to the comfortable sensation of the sleeping was the degree of support in maintaining the natural shape of the spine and waist. Durability and the degree of hardness of the mattress were also important physical parameters of bed perceived by consumer. (3) The degree of discomfort on the back and waist during sleep was closely related to the comfort evaluation of the bed.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.26-30
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• 1986

This survey paper presents a review of control methods for redundant robot manipulators. Use of redundant degree of freedoms by local and global optimization techniques are described in terms of the Jacobian matrix equation for the redundant robot manipulators. Relevant problems for further use of redundant robot manipulators are then discussed.

• Journal of Society of Preventive Korean Medicine
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• v.21 no.1
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• pp.1-8
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• 2017

Objectives : The concurrent use of Korean Medicine (KM) and Western Medicine (WM) for the management of disease are increasing. In this study, the factors determining the choice of concurrent use of KM and WM was investigated based on national survey data for the public. Methods : Survey data from 1239 people with experience treating diseases with KM were utilized for this study. The national survey data were gathered using e-mail and face-to-face interviews between December 2007 and January 2008. Results : Among people who had been treated with KM, 819 (66%) used both KM and WM to the treat same disease. Multivariable analysis revealed that concurrent users of KM and WM were significantly associated with age 40-69 (OR=1.43, 95% CI=1.12-1.82), university education or higher (OR=1.34; 95% CI=1.05-1.71), enhanced health status (OR = 0.47, 95% CI=0.35-0.62) and unsatisfied with WM (OR = 1.71, 95% CI=1.02-2.87). The respondents that reported KM was more effective than WM among concurrent users of KM and WM were significantly associated with being an office worker (OR=1.78, 95% CI=1.25-2.53), age 40-69 (OR = 0.62, 95% CI=0.44-0.86), unsatisfied with WM (OR=2.61, 95% CI=1.51-4.50) and overall satisfied with KM (OR=8.38, 95% CI=5.65-12.44) Conclusions : This study showed that two-thirds of KM user were concurrent user of KM and WM, and some influential factors determined the choice of a concurrent use of KM and WM. Therefore, Korean Medicine Doctors should consider the possibility of concurrent use, need to know the information on the benefits and risks of concurrent use.

• Journal of Preventive Medicine and Public Health
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• v.50 no.1
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• pp.60-65
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• 2017

Objectives: We examined the prevalence of tobacco use and exposure to secondhand smoke among middle-school students in Korea using the Global Youth Tobacco Survey (GYTS) in 2013. Methods: The GYTS in Korea was conducted between July and August 2013 by the Korea Centers for Disease Control and Prevention. Data were collected using a self-administered anonymous questionnaire from a nationally representative sample of middle-school students aged 13-15 years in sampled classrooms. Results: The GYTS in Korea was completed by 4235 students aged 13-15 years in 43 middle schools. Approximately one in five of the students (17.8%) reported that they had tried cigarettes in the past, while 5.2% reported currently being cigarette smokers. Current cigarette smoking was higher in boys (7.5%) than in girls (2.6%). Of the students, 29.7% had been exposed to secondhand smoke at home, 47.4% inside enclosed public places, and 53.9% in outdoor public places. Of the current cigarette smokers, 25.7% bought their cigarettes from a store despite a law prohibiting this. Additionally, 58.0% of students noticed point-of-sale tobacco advertisements or promotions, 66.8% of current cigarette smokers wanted to stop smoking, and 70.9% of students had been taught about the dangers of tobacco use in school. Conclusions: These findings provide an opportunity to develop, implement, and evaluate a comprehensive tobacco control policy. The results suggest that youth have relatively easy access to cigarettes and are regularly exposed to secondhand smoke in public places, as well as to point-of-sale tobacco advertisements and promotions. Strict enforcement of the ban on tobacco sales to youth, expanding smoke-free areas, and advertising bans are needed to reduce tobacco use among youth.

• Asia-Pacific Journal of Business
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• v.13 no.3
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• pp.293-309
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• 2022

Purpose - The purpose of this study is to explore the possibility of predicting the degree of smartphone overdependence based on mobile phone usage patterns. Design/methodology/approach - In this study, a survey conducted by Korea Internet and Security Agency(KISA) called "problematic smartphone use survey" was analyzed. The survey consists of 180 questions, and data were collected from 29,712 participants. Based on the data on the smartphone usage pattern obtained through the questionnaire, the smartphone addiction level was predicted using machine learning techniques. k-NN, gradient boosting, XGBoost, CatBoost, AdaBoost and random forest algorithms were employed. Findings - First, while various factors together influence the smartphone overdependence level, the results show that all machine learning techniques perform well to predict the smartphone overdependence level. Especially, we focus on the features which can be obtained from the smartphone log data (without psychological factors). It means that our results can be a basis for diagnostic programs to detect problematic smartphone use. Second, the results show that information on users' age, marriage and smartphone usage patterns can be used as predictors to determine whether users are addicted to smartphones. Other demographic characteristics such as sex or region did not appear to significantly affect smartphone overdependence levels. Research implications or Originality - While there are some studies that predict smartphone overdependence level using machine learning techniques, but the studies only present algorithm performance based on survey data. In this study, based on the information gain measure, questions that have more influence on the smartphone overdependence level are presented, and the performance of algorithms according to the questions is compared. Through the results of this study, it is shown that smartphone overdependence level can be predicted with less information if questions about smartphone use are given appropriately.

• Journal of Environmental Health Sciences
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• v.46 no.6
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• pp.702-709
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• 2020

Objectives: Hand sanitizer is made with ethyl alcohol as the main ingredient. Problems related to the use of hand sanitizers and cases of harm caused by the use of hand sanitizers are occurring. This study investigated the usage behavior and recognition level of people using hand sanitizer and identified the chemical components listed in the component label of hand sanitizer. In addition, the methanol and isopropanol contained in hand sanitizer were quantified using HS-GC-MSD. Methods: The investigation of the behavior and recognition of hand sanitizer usage was conducted through a survey of 143 college students and adults. The components marked on 34 types of hand sanitizers were investigated, and methanol and isopropanol concentrations were analyzed using the HS-GC-MSD method. Results: According to the survey, 57% of respondents use hand sanitizers two to three times per day, 92.3% of them do so when in public places and 41.3% of them do so at home. Ethanol, purified water, carbomer, glycerin, and triethanolamine were the ingredients listed in the hand sanitizer. Among the 34 samples, methanol and isopropyl alcohol were detected in 33 samples, the concentration range for methanol was ND-567 ppm, and the concentration range of isopropyl alcohol was ND-2121 ppm. Conclusion: The results of this study have shown that hand sanitizers are being used constantly every day, and methanol, which is not included in the marked content, was detected in a significant concentration compared to wet tissue. It has been found that maintenance of hand sanitizer manufacturing standards and training on how to use them are needed.

• The Journal of the Korea Contents Association
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• v.6 no.8
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• pp.105-113
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• 2006

For reasonable planning and decisions, spatial Planners should gather and analyse land use information which includes lots, zoning, population, households, buildings, usage, and etc. This study aims to define the demands of land use information for spatial planning. From literature reviews, case studies, and survey, this study shows those findings as following. First most spatial planners suffer from the difficulty of gathering land use information. Second, the priority order of the information could be shown by survey. Third, the unit and renewal period of the spatial information could be defined. Those findings could be a base of information systems for spatial planning.

• Clinical and Experimental Pediatrics
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• v.61 no.12
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• pp.381-386
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• 2018

Purpose: The use of proper safety restraint systems by children is vital for the reduction of traffic accident-related injury and death. This study evaluated the rates of use of safety restraint systems and front seats by Korean children. Methods: Based on data from the National Health and Nutrition Examination Survey from 2008 to 2015, I investigated the frequencies of safety restraint systems and front seat use by children under six and 12 years of age, respectively. Results: The percentage of respondents who said they always use safety restraint systems increased from 17.7% in 2008 to 45.0% in 2015. The rate of children who did not use the front seats at all was 47.3 % in 2008 compared to 33.4% in 2015. Multivariate logistic regression analysis showed a decrease in safety-restraint-system use as age increased (odds ratio, 0.63; 95% confidence interval [CI], 0.51-0.77). The use rate of front-passenger seat belts by the mother is significantly correlated with the safety-restraint-system use rate by children (odds ratio, 2.14; 95% CI, 1.12-4.06). Conclusion: Although the rate of safety-restraint-system use for children is increasing annually, it remains low. Additionally, the use rate of front passenger seats for children is high. To reduce the rates of injury and death of children from traffic accidents, it is necessary to educate on the appropriate use of safety restraint systems according to age and body size and to develop stronger regulations.

• Journal of the Korean housing association
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• v.16 no.5
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• pp.107-116
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• 2005

This study focuses on the planning and actual use of the transitional spaces in the residential-commercial mixed-use buildings. The range of case study include from the year of 1960's to 2000. Through the case study and field survey, we can extract the elements of the transitional space and the problems of Mixed-Use building from the viewpoint of transitional space. According to the field survey, most of the residential-commercial mixed-use buildings contain the transitional space to some degree, but there need to be a more active planning method to secure the residential factors and for this reason, the application of the transitional space must be emphasized at a higher level.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2004.05a
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• pp.127-130
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• 2004

In order to verify the validity of the exhibition moethod in a science museum, this study undertakes a visitor follow-up survey, and clarifies the influence an exhibition method affect visitor's behavior, and its feature. The tracking research performed the visitor follow-up survey to family company children. The characteristic of the visitor's behavior by the exhibition method; Use frequency becomes low in order of 'Experience type' 'Participation type' 'Fixed type'. Experience type has tendencies, such as repetitive and continuing use, and use time was long. Otherwise use time of Fixed type was short. As a result, although the use frequency of Hands-on is high and its use time is longer than Hands-off, it turns out that is influenced according to factors, such as the exhibition method, presentation and the contents of exhibition.