• Journal of Digital Convergence
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• v.14 no.1
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• pp.13-23
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• 2016

The purpose of this study is to examine the perceptions and attitudes of pre-service early childhood education teachers about the introduction and utilization of smart education. We selected 262 pre-service early childhood education teachers. The Focus Group Interview and questionnaire were used to measure the perceptions and attitudes about the introduction and utilization of smart education. As a result, most of pre-service early childhood education teachers use smart phones and they use extra two more hours except phone calls. The most frequent usage is text. It is affected to device utilization experience in class, impact on childhood development. FGI results of pre-service early childhood education teachers for the introduction and utilization of smart education were analyzed by 2 subjects, 4 categories, 18 items.

• Journal of Digital Convergence
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• v.14 no.3
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• pp.329-335
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• 2016

This paper's objective is to investigate the display fatigue quantitatively according to watching 2D and 3D videos on the display. Though it has been known commonly that display fatigue by 3D is greater than one by 2D, there have been few researches with an aim to measure display fatigue scientifically. Flicker fusion frequency and cybersickness degree were measured before/after sixteen subjects(Male 8, Female 8) watch the 2D, 3D images. Two dependent variables affected by 2D and 3D videos were analyzed and compared statistically based on scientific evidences and researches. 3D showed a value 4 times as much as 2D in cybersickness increase rate, and the reduction rate of 3D was 2 times as much as that of 2D.

• Journal of Digital Convergence
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• v.12 no.11
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• pp.373-378
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• 2014

The technology of direction finding is very important to make high position fixing accuracy. TDOA(time difference of arrival) direction finding technology is a high accuracy technology and is used in RF system from 1990. The principle of TDOA is to receive an emitter signal with two antennas, measure the time difference of received signal and then convert the time differences to azimuth angle. For high DF(direction finding) accuracy long basis line and high SNR at receiving system are needed. The DF accuracy and position fixing accuracy are simulated with different SNRs and antenna base lines. We obtain the DF accuracy of $0.51^{\circ}$ at $0^{\circ}$ incident azimuth angle in case of 50m base line and 40dB SNR.

• Journal of Digital Convergence
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• v.12 no.11
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• pp.273-279
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• 2014

In this paper, we propose a novel algorithm for three dimensional positioning system and implement a system over indoor wireless channel. A commercial modules are used for mobile and fixed nodes which are product of German company Nanotron Co. This module adopts chirp spread spreading scheme as modulation method to improve the ranging resolution and the module satisfies the IEEE standard 802.15.4a. The distance computation is based on received signal strength(RSS) levels and trilateration method. A testbed was set up to measure and compare the positioning estimation error of the proposed algorithm. The experiments results showed that the accuracy of location estimation was sufficiently good as much as 1m distance error in a wireless environment in an office building.

• Journal of Digital Convergence
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• v.11 no.3
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• pp.175-180
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• 2013

To compete global marketplace, many firms are adopting product families to increase variety, satisfy customer requirements, shorten lead-times and reduce costs. The key to a successful product family is the platform from which it is derived. When designing product families, it is important to resolve the tradeoff between product commonality and distinctiveness. To measure the commonality within a product family, it is necessary to develop the commonality index. It utilizes different parameters such as the number of common components, their cost, their manufacturing processes and so on. This paper present a new product family assessment index using the benchmarking method and considering environmental performance called green product family index(GPFI). Through the comparison analysis between some previous developed commonality indices and GPFI, we verify the suitability and effectiveness. Eventually, the proposed a new green product family assessment index can be helpful to design and develop the environmentally conscious product families.

• Journal of Digital Convergence
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• v.14 no.11
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• pp.357-367
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• 2016

In this study, we examined the impact on balance ability and jump performance of soccer players with functional ankle instability using virtual reality based neuromuscular posture control fusion training. Soccer players were divided into 15 people of virtual reality-based neuromuscular posture control fusion training group and 15 people of common treadmill training group and performed for 30 minutes three times a week for 8 weeks. In order to evaluate the balance of ability, using biorescue, it measured surface area, whole path length, limit of stability. In order to measure jump performance, it measured counter movement jump with arm swing and standing long jump. The results showed the statistically significant difference in the balance comparison of surface area, whole path length, limited of stability and the jump performance comparison of counter movement jump with arm swing, standing long jump. As a result, virtual reality-based neuromuscular posture control fusion training was found to be more effective to improve its balance ability and jump performance than common treadmill training.

• Journal of Digital Convergence
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• v.14 no.11
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• pp.53-61
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• 2016

This study aims to examine English learning beliefs of Korean college students enrolled in e-learning courses and to investigate the relationship between their beliefs and L2 achievement. Horwitz's Beliefs about Language Learning Inventory was used to elicit students' beliefs about English learning and their grades in a final exam were employed for the English achievement measure. The data from one hundred sixteen respondents were analyzed through a factor analysis and the analysis revealed 5 factors: Motivation, learning strategies, English aptitude, foreign language aptitude, and communication strategies. The results showed that the most of the e-learning students had a high level of motivation and expectation in learning English but they believed that they had a low language aptitude. Statistically significant correlation was found between students' beliefs in motivation and their L2 attainment.

• Journal of Digital Convergence
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• v.14 no.11
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• pp.13-26
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• 2016

in order to measure business performance against the programs supporting enterprises proceeding with LINC project, we have evaluated and checked satisfaction and effectiveness of the supporting programs to the extent that how well people recognize its significance and the related influence factors. For doing this, we have utilized questionnaire method and analyzed the research models and hypothesis in accordance with the variables and then verified the hypothesis. Based on the analysis, the satisfaction and effectiveness of the supporting programs was significant, resulting that the better administration system of the colleges and the enterprises participating in the programs, the higher satisfaction. According to this study, the result of the research showed that the degree of participation in the supporting program and the administration system of the colleges are the key converged influence factors to its satisfaction and effectiveness. However, so far, we have only focused on the questionnaire measuring the effectiveness. From next time on, we insist that we have to continually conduct more precise research which analyzes revenues of the participating enterprises.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.5
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• pp.1052-1059
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• 2009

Health care has become one of the paramount issues of the 21st century as governments and individuals grapples the complex problems associated with contemporary medical care such as cost, affordability, and shifting demographic trends. The purpose of this study was to develop the critical success factors of medical tourism for health-care organizations and to measure the wights of these factors. For this purpose, we gathered the data from doctors, travelling agencies and scholars. about the success factors of medical tourism. Exploratory and confirmatory factor analysis was carried out to determine the factors as the Critical Success Factors of medical tourism. We did also the research to evaluate the validity and reliability of these factors. After that the Analytical Hierarchy Process (AHP) was applied to analyze the weight and significances among these factors. Factor analysis resulted in 15 major factors (Eigenvalue > 1.0). The AHP analysis showed the list of Critical Success Factors weighted by its significance priorities. The recommendable degree of reliability and validity suggests that these factors could be the valuable refences for the policy making process of the medical tourism in Korea.

• Journal of Digital Convergence
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• v.13 no.7
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• pp.381-391
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• 2015

Today, individuals' psychological attitude toward health has been changed from passive to active and dynamic way of thinking. This trend has made attention to wellness more interesting. However, prior studies regarding wellness have been limited in developing indices to measure status of individuals' wellness. Thus, this study adopts five major components of wellness, including physical, emotional, intellectual, social, and occupational wellness in order to examine their effects on individuals' wellness state. The data from 494 employee at various organizations were analyzed to test proposed hypotheses. The results reveal that five components of wellness have a significant influence on wellness status. Based on the findings, academic and practical implications for wellness convergence systems are discussed.