• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.6
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• pp.81-91
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• 2008

In this study, data collection delay time generated in bus information system is analysed and improvement on system reliability by minimizing the delay time is suggested. To minimize the data collection delay time (call setup time), factors on data collection phase are analyzed. Each connecting time that it occurs from wireless communication during data collection phase, is selected as a main effective variable and a model for selecting an optimum communication point to minimize the effect of data delay time by each connecting time is suggested. In this model, minimization of the point between the time carrying out wireless communication and vehicle moving time, is calculated and the difference between the bus arrival time and information delivered time to the passenger is reduced. The test results for the proposed model in BIS using a CDMA (Code Division Multiple Access) communication show that delay time in real system operation has been improved. The minimum data collection delay time based on optimal communication position leads to the better reliability for Bus Information System. This study can be applied to the selection of optimal communication position and detection position instead of empirical methods.

• The Research Journal of the Costume Culture
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• v.20 no.6
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• pp.895-911
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• 2012

The purpose of this study was to examine consumers' perceptions of eco-friendly children's-wear and their impact on the selection criteria for children's-wear and stores. A descriptive survey method using a self-administered questionnaire was employed. The sample consisted of mothers with children under the age of 13 residing in Seoul and the Gyeonggi area. Data were collected from September 2011 to October, 2011. The collected data were analyzed to find the differences between purchasers and non-purchasers of eco-friendly children's-wear in terms of their perceptions of eco-friendly children's-wear, as well as the influence of these perceptions on the consideration degree of criteria for the selection of children's wear and store. The results indicate that perceptions of eco-friendly children's-wear implied five key factors related to quality reliability, expected value, style, degree of recognition, and dissatisfaction with design and price. The results also revealed some differences between the group purchasing eco-friendly children's-wear and the group not purchasing eco-friendly children's-wear. These different perceptions were related to the aspects of quality reliability, expected value, style, degree of recognition. In general, the non-purchasing group displayed a lower mean score than the purchasing group. Both groups showed a low interest in aesthetic appreciation and the degree of recognition factor. The results showed that consumer's perceptions of eco-friendly children's-wear had an influence on the criteria for the selection of children's-wear and store type in both groups. Considering the findings of the study, it is clear that both purchasers and non-purchasers of eco-friendly children's-wear showed differences in their perceptions and purchasing behavior. Therefore, marketing strategies to appeal to the non-purchasing group should be differentiated from strategies used to ensure the loyalty of the purchasing group.

• Journal of The Korean Association For Science Education
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• v.40 no.5
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• pp.485-502
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• 2020

The purpose of this study was to develop an instrument for the measuring students' state curiosity and anxiety by dividing science learning context into three stages: when confronting scientific task, checking the results, learning science concepts, and verify the validity and reliability of the measurement tools developed. For this purpose, based on the theoretical background of various prior studies, science state curiosity and science state anxiety were defined in three stages of the learning context, and preliminary items were developed according to these definitions. The preliminary items were developed with the same number and the basic framework for each stage to identify changes in state curiosity and anxiety. Some preliminary items were refined during the confirming face validity and content validity. As a result of the exploratory and confirmatory factor analysis, the measurement tool consisted of five items of state curiosity and five items of state anxiety (two factors, ten items) at each stage, and confirmed the construct validity of the measurement tool. The Cronbach alpha was 0.8 or higher for each factor or for all items. This measurement tool is meaningful in that it can measure the state curiosity and anxiety applicable in three stages of science learning context and identify the changes.

• Journal of Digital Contents Society
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• v.19 no.6
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• pp.1151-1160
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• 2018

The study has been derived through the empirical analysis so as to find the usage behavior of cloud-based common collaboration platform. Independent variables of the cloud-based platform have been selected as flexibility, reliability, versatility, security and interaction, which have been selected by utilizing UTAUT theory. After selecting the use intent as a parameter, usage behavior was been finally selected as a dependent variable. The firm type was used as a control variable. We used AMOS 23.0 and SPSS 23.0 statistical programs for the hypothesis test and distributed the questionnaires to users using the cloud-based common collaboration platform. Then, a total of 180 copies from distributed questionnaires were used for the analysis. The results showed that reliability, security and interaction had a positive effect on intention to use. On the other hand, flexibility and versatility did not affect intention to use positively. Finally, it was verified that the intention to use had a positive effect on the use behavior. At last, it showed that there is a moderation effect according to the type of company.

• Journal of Digital Convergence
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• v.16 no.5
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• pp.173-183
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• 2018

In this study, we tried to examine the effect of service quality on the current industrial product B2B trading market on the degree of sustainable purchase for employees engaged in industrial product B2B trading market. We gathered data from questionnaires from employees who worked in the industrial product B2B trading market for this research. Empirical analysis is carried out through the collected questionnaire materials and finally the research model is finally verified using reliability analysis, validity analysis, discrimination validity analysis, and structural equation model fitness test, and finally Analysis of differences between cooperating companies and vendor, analysis of differences between companies engaged in purchasing industrial materials and developers. The results of the research analysis did not positively influence the quality of the relationship with relativity satisfaction with ease of information exchange and adaptability did not have a positive influence on the quality of the relationship. However, product service exchange, product development cooperation, adaptability, correspondence, reliability had a positive influence on the quality of relationship with relation satisfaction. Relationship of parameters The satisfaction has a positive influence on the quality of the relationship, the degree of sustainable purchase, and eventually the quality of the relationship has a positive influence on each successive purchase. By using the results of this research it is possible to confirm the factors which directly or indirectly influence the strengthening of the relationship between suppliers and purchasers in the industrial material B2B trading market and provide the basis for strategy to B2B trading companies It seems to be meaningful to offer.

• Journal of the Korean Society of Safety
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• v.35 no.1
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• pp.87-96
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• 2020

The purpose of this paper is to develop a fire HRA (Human Reliability Analysis) procedure for full power operation of domestic NPPs (Nuclear Power Plants). For the development of fire HRA procedure, the recent research results of NUREG-1921 in an effort to meet the requirements of the ASME/ANS PRA Standard were reviewed. The K-HRA method, a standard method for HRA of a domestic level 1 PSA (Probabilistic Safety Assessment) and fire related procedures in domestic NPPs were reviewed. Based on the review, a procedure for the fire HRA required for a domestic fire PSA based on the K-HRA method was developed. To this end, HRA issues such as new operator actions required in the event of a fire and complexity of fire situations were considered. Based on the four kinds of HFE (Human Failure Event) developed for a fire HRA in this research, a qualitative analysis such as feasibility evaluation was suggested. And also a quantitative analysis process which consists of screening analysis and detailed analysis was proposed. For the qualitative analysis, a screening analysis by NUREG-1921 was used. In this research, the screening criteria for the screening analysis was modified to reduce vague description and to reflect recent experimental results. For a detailed analysis, the K-HRA method and scoping analysis by NUREG-1921 were adopted. To apply K-HRA to fire HRA for quantification, efforts to modify PSFs (Performance Shaping Factors) of K-HRA to reflect fire situation and effects were made. For example, an absence of STA (Shift Technical Advisor) to command a fire brigade at a fire area is considered and the absence time should be reflected for a HEP (Human Error Probability) quantification. Based on the fire HRA procedure developed in this paper, a case study for HEP quantification such as a screening analysis and detailed analysis with the modified K-HRA was performed. It is expected that the HRA procedure suggested in this paper will be utilized for fire PSA for domestic NPPs as it is the first attempt to establish an HRA process considering fire effects.

• The Journal of Korean society of community based occupational therapy
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• v.9 no.2
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• pp.43-58
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• 2019

Objective : The purpose of this study was to develop an assessment tool to measure Korean occupational balance. Methods : From March 2017 to July 2019, preliminary questionnaire was prepared through analysis of previous research and expert focus meeting, and preliminary questions were selected through the Delphi survey. In order to verify the validity of the items, Rash analysis was conducted to analyze the persons and items fitness, the distribution of item difficulty, separation reliability, and the appropriateness of the rating scale. Results : Among 141 subjects, 9 (6.38%) in time use and 11 (7.80%) in the occupation area were inappropriate subjects. As a result of analyzing the appropriateness of the items except for the inappropriate subjects, the 3 items were judged as ineligible items, but 1 item of the occupation characteristics was finally deleted based on the theoretical and clinical grounds. In the analysis of the scale, 4 points were more appropriate than the 5 point scale, and the separation reliability was .86~.94. Finally, 3 categories (time use, occupation area, occupation characteristics) and 18 items were selected. Conclusion : The occupational balance assessment tool was selected three categories and 18 questions finally, three categories and 18 questions, and was developed on a four-point Likert scale. Further research needs to prove the concurrent validity of the K-OBA and to analyze the factors that influence the occupational balance.

• Korean Journal of Social Welfare
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• v.60 no.1
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• pp.211-231
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• 2008

In phase 1 of the study, data for the construct and items of KESAS(The Korean Elderly's Successful Aging Scale) were collected by indepth interviews with a purposive sampling group of 25 elderly people and focus group interviews with four groups. Content analysis was applied to the data and from this analysis were emerged six key categories of successful aging. In phase 2 of the study, 78 items were collected from the data of 2 sets of interviews mentioned above. Through pilot test, preliminary 66 items are selected. In phase 3 of the study, 597 cases collected from the survey were divided randomly into 345 developmental samples and 252 validity samples. The items were examined exploratorily with the developmental samples and confirmatorily factor analysis with validity samples. Confirmatory factor analysis supported the hypothesized six-factor structure of KESAS, which finally resulted in consisting of 31 items. Six factors are as follows: 'autonomous life', 'self-completion orientation', 'positive life participation', 'satisfaction with one's offsprings', 'self-acceptance', 'other-acceptance'. Cronbach's alpha estimate and split-half estimates of the scale were .903 and .845, which confirms that the scale has reliability. This six-factor model exhibited a good fit on the basis of the overall fit measure criteria(TLI=.983, RMSEA=.057) aquired by using the confirmatory factor analysis. Moreover, KESAS was significantly related highly(r=.72) to the 'Quality of Life for the Korean Elderly'. This proved concurrent validity of the scale.

• Journal of Korean Society of Steel Construction
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• v.25 no.4
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• pp.335-346
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• 2013

AASHTO LRFD and Korean Bridge Design Code (Limit State Design) specify to consider Truck and Lane load simultaneously determined from reliability-based live load model, and impact shall be applied to the truck load while it shall not be applied to the lane load. In this paper, vehicle-bridge interaction analysis under moving truck and lane loads were performed to estimate impact factor of the cables and girders for the selected multi-cable-stayed composite bridges with 230m, 400m and 540m main span. A 6-d.o.f. vehicle was used for truck load and a series of single-axle vehicles was applied to simulate equivalent lane load. The effect of damping ratio on the impact factor was estimated and then the essential parameters to impact factor, i.e., road surface roughness and vehicle speed were considered. The road surface roughness was randomly generated based on ISO 8608 and it was applied to the truck load only in the vehicle-bridge interaction analysis. The impact factors evaluated from dynamic interaction analysis were also compared with those by the influence line method that is currently used in design practice to estimate impact factor in cable-stayed bridge.

• The Journal of the Korea Contents Association
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• v.11 no.7
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• pp.437-447
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• 2011

This study will compare and analyze the effect of satisfaction of security needs on life satisfaction according to sociodemographic features and will find the factors of security needs satisfaction and life satisfaction. a total of three humdred questionnaires was distributed to male and female who live in Seoul(Gang-dong, Gang-sue, Songpa-gu and Gand-buk) in Aug. and Sept., 2010 and over nineteen years old. Except making the wrong questionnaires, total questionnaires was sampled from 259 questionnaires using judgment sampling method after selecting. Data analysis be used by SPSSWIN 18.0 Version. The validity and reliability of questionnaires are verified for factorial analysis and reliability analysis and also T test and F test are used for finding for differences of life satisfaction and satisfaction of security needs. And, this study is tested the regression analysis for the effects on the life satisfaction and satisfaction of security. Utilizing CCTV on the Life Satisfaction, this study were drawn the conclusions as following. First, the satisfaction of security needs as demographic characteristics have the part of the difference. the result shows to different psychological needs as educational level at the group less than college graduates. Second, the result of satisfaction of security as demographic characteristics is significantly higher in the male group and life satisfaction as education is significantly higher in more than college graduates. Third, the satisfaction of security needs of citizens through the CCTV effects to life satisfaction. environmental needs and information needs are as high as life satisfaction.