• Journal of Digital Convergence
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• v.11 no.11
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• pp.143-153
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• 2013

Big data is expected to bring forth enormous public good as well as economic opportunity. However there is ongoing concern about privacy not only from public authorities but also from private enterprises. Big data is suspected to aggravate the existing privacy battle ground by introducing new types of privacy risks such as privacy risk of behavioral pattern. On the other hand, big data is asserted to become a new way to by-pass tradition behavioral tracking such as cookies, DPIs, finger printing${\cdots}$ and etc. For it is not based on a targeted person. This paper is to find out if big data could contribute to catching out behavioral patterns of consumers without threatening or damaging their privacy. The difference between traditional behavioral tracking and big data analysis from the perspective of privacy will be discerned.

• Journal of Digital Convergence
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• v.11 no.7
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• pp.255-260
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• 2013

This study was attempted to identify the differences of mental health and media use according to the addiction of communication media. Data collection was surveyed using interview and questionnaires by 250 subjects from March 12 to May 13, 2012. The results were as follows : First, with regard to mobile phone use time for communication in the use of over 2 hrs, subjects replied that addictive group was significantly higher than non-addictive group($X^2$=8.51, p=.00). Secondly, in case often depression, the risk ratio of addictive group was significantly higher 4.0 times than non-addictive group(OR=4.0, 95%, Cl=2.4-36.9). In conclusion, in order to prevent the addictive use of communication media, it is needed to make various environment such as sound life rhythm maintenance, systemic and periodic education.

• Journal of Digital Convergence
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• v.15 no.3
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• pp.229-236
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• 2017

The purpose of this study was to review the study design, participants, intervention and its outcomes of studies for post-dura puncture headache using systematic review. Total 4234 studies were searched from 1980 to 2016 years,15 studies were included in final. Total 5239 patients were participated in studies, and 10 RCTs studies and 5 observational studies were included. The findings showed that experimental studies used the 24hr bedrest intervention as a control group for comparing the prevalence of headache with the early ambulation intervention group. The prevalence of headache in ambulation group was lower than 24hr bedrest group (except 2 studies). The high risk methodological bias should be considered when understandings the research findings. Based on this study, meta-analysis study for investigating the proper period of time for bedrest should be performed in further study.

• Journal of Digital Convergence
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• v.13 no.5
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• pp.219-226
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• 2015

OTP(One Time Password) is for user authentication of Internet banking and users should carry their security card or OTP generator to use OTP. If they lost their security card or OTP generator, there is at risk for OTP leak. This paper suggests a new User Authentication Framework using personal health information from diverse technology of u-Health. It will cover the problem of OTP loss and illegal reproduction A User Authentication Framework is worthy of use because it uses various combinations of user's physical condition which is inconstant. This protocol is also safe from leaking information due to encryption of reliable institutes. Users don't need to bring their OTP generator or card when they use bank, shopping mall, and game site where existing OTP is used.

• Journal of Digital Convergence
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• v.10 no.7
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• pp.221-227
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• 2012

In this study, attachment to parents of middle school students and they relate to school life stressors, and self-esteem of adolescent Internet addiction affects the aimed to clarify. The findings on gender statistics, chi-square value 9.347 corresponding to the Internet than female students at risk of addiction involves a lot, and self-esteem on the relationship between internet addiction and Kruskal-Wallis test statistic value of self-esteem to 3.868 two were negatively correlated. The school stresses and Internet gaming addiction Kruskal-Wallis test statistic values are 7.763, 3.819 correlation appeared to. Thus, self-esteem, peer relationships, teacher support programs that strengthen the relationship to develop, to deploy more concentrating on the policy implications and suggestions you have made that is meaningful to them.

• Journal of Digital Convergence
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• v.14 no.7
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• pp.45-56
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• 2016

The purpose of this study was to determine the association between depressive symptoms and psychological stress, and to investigate the factors affecting depressive symptoms among male high school students. The study subjects were 573 male students surveyed from a self-administered questionnaire in October 2015. As a result, the distribution of psychosocial stress of surveyed students was 14.8% of health group, 71.9% of latent stress group, 13.3% of high-risk stress group. Depressed level of 71.4% of the distribution is normal group, mild depression group 25.30%, moderate depression group 3.0%, 0.3% was severely depressed group. The factors influencing the students' depressed levels were subjective health status, whether breakfast, sleep hour per day, academic achievement, worries, satisfaction with school life, perceived family income and psychosocial stress has been selected. In particular, the stress is related to the high depression. Therefore, it is considered that stress management is necessary in order to reduce the students' depression.

• Journal of Digital Convergence
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• v.14 no.7
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• pp.11-20
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• 2016

This study examines the possibility of implementing the technology financing for export-import based small and medium sized enterprises. Our sample consists of 2,753 small and medium sized enterprises, receiving financial support from the Export-Import Bank of Korea for the period of 2011-2013. We find that only 400(200) firms reserve IPs(patents) annually. Given that IPs are likely to concentrate on manufacturer industries such as electronic components, computers, video, sound and communication equipment manufacturing(KSIC 26), other machinery and equipment manufacturing(KSIC 29), manufacture of motor vehicles and trailers(KSIC 31). We also find that the total assets, sales and R&D expenses of IP holding companies greatly exceeds those of companies without IPs. In addition, IP holding companies' liquidity seems slight edge and the leverage ratio is somewhat lower. However, profitability ratios of IP holding companies are rather than harsh or similar level. 20~30% of IP holding firms show very week credit scores, implying that banks' default risk is expected to be significant.

• Journal of Digital Convergence
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• v.11 no.1
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• pp.267-273
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• 2013

Recently, coupons are distributed in various ways such as paper, Internet, and mobile phone, with the development of the information and communications technology. Coupon users benefit from the use of these coupons. For example, they can get a discount for the product that they wanted to buy and can be offered additional services. However, paper and Internet coupons have a risk of loss since users have to cut them out and keep them separately. Mobile coupons also don't provide users with user convenience, because coupon users first look for coupon data from their mobile phone and show it to the counterperson. To solve these problems, this study proposes a NFC-based mobile coupon system under which we can use coupon data only with mobile device access.

• Journal of Digital Convergence
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• v.15 no.2
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• pp.59-65
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• 2017

The basic goal of urban safety is to support citizens' quality of life and city competitiveness, and its importance is increasing. Since the risk of disasters is growing, there is a growing demand from society for minimizing the damage by preventing and responding to them in advance. In case of urban governments, securing safety emerges as one of the most important policy tasks due to natural disasters such as heavy rain and heavy snow and human disasters such as various accidents. Recently, it is emphasized the necessity to increase the prevention effect through disaster analysis using Big Data. This study examined paradigm change of disaster safety management using big data centering on Seoul city. In particular, the study tried case analysis from the viewpoint of maximizing effective government services for disaster safety management, and sought the strategic meaning in connection with the ordinance.

• Journal of Digital Convergence
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• v.16 no.7
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• pp.493-509
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• 2018

This study was performed to compare the effects of health behaviors, dietary habits, and psychological health on metabolic syndrome (MS) between young adults living in one-person households (OPHs) and multiple-person households (MPHs). The data from the Korean National Health and Nutrition Examination Survey (KNHANES), which was conducted in 2014 and 2016 were used. The subjects were 2,682, who were 20 to 39 years old. The data were analyzed using complex sample Rao-Scott ${\chi}^2-tests$, t-tests, and multiple logistic regression using SPSS 23.0 software. Sex, age, obesity, and subjective health status were associated with MS in young adults living in either OPHs or MPHs. Breakfast consumption frequency, eating alone, food label use, stress, and depression were associated with MS only in young adults living in OPHs. Thus, these differentiated risk factors of MS should be considered, when health promotion strategies and interventions are planned for young adults living in OPHs. Also, further studies are needed to evaluate the effectiveness of the strategies or interventions.