• Journal of Digital Convergence
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• v.12 no.3
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• pp.227-235
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• 2014

Mobile virtualization is an approach to mobile device management in which two virtual platforms are installed on a single wireless device. A smartphone, a single wireless device, might have one virtual environment for business use and one for personal use. Mobile virtualization might also allow one device to run two different operating systems, allowing the same phone to run both RTOS and Android apps. In this paper, we propose the techniques to virtualize the cores of a multicore, allowing the reassign any number of vCPUs that are exposed to a OS to any subset of the pCPUs. And then we also propose the real-time scheduling method to assigning the vCPUs to the pCPU. Suggested technology in this paper solves problem that increases time of real-time process when interrupt are handled, and is able more to fast processing than previous algorithm.

• Journal of Digital Convergence
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• v.15 no.3
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• pp.301-306
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• 2017

With the popularization of smart-phone, a variety of application service user is a rising trend now. In contrast, studies concerning library application service that cast a long shadow over the life of students and citizens still lacking in many ways. This study evaluates user experience of Young-in Si public library application service, and investigates user requirements. I searched the real user reviews about Young-in Si library application both App store and Android market. As the final outcome, I found inconveniences and improvements of this service. The application is intuitive, but requires consistent design, strong identity and customizing main page. It will be suggested specific guidelines for the public library mobile services in other areas.

• Journal of Digital Convergence
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• v.10 no.7
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• pp.85-92
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• 2012

To the development of IT technologies, online shopping is implemented in various forms ranging from desktop environment to smartphone, and also variety of items are being sold. In addition, various type of online sales from that can not seen in offline like sales a one products per one day. In this type of sales, competition is extremely intensified and among those in the differentiated features are hold competitiveness. In this paper, we design and develop the site that adopts the online marketing technique - sale only one kind of product a day for increasing the sales revenue. To do this, in traditional commercial sites, we develop the marketing strategy, and information placement is emphasized site based on analysis of the daily product site planning and so that costumers are concentrated the products that did not interested. Though which customers to target specific items one day for some items and increasing publicity would help the sales increase is expected.

• Journal of Digital Convergence
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• v.11 no.9
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• pp.201-207
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• 2013

Recently, the interest in a Mobile Office is increasing dramatically and the Smart Phone App Service begin in earnest to be requested in an area of applying SAP system to PC. This study aims to research the system which can be easily implemented with the configuration and Mobile App which cause difficulties in embodying SAP system-based Apps suitable for a mobile environment. First, by realizing SAP system interface that can operate in mobile devices in the form of GUI, assisting the connecting parts of SAP for the users-friendly set-up, providing the communication method of Client, Application, and SAP Service in the form of web service through TCP/IP, and finally showing cases of implementing the method of delivering the data request and result value of Server and Client in the form of XML suggest more effective and new method, the research suggests a new way of making the linkage of SAP more efficient.

• Journal of Digital Convergence
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• v.15 no.4
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• pp.157-169
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• 2017

The purpose of this study is to understand the characteristics of O2O service which is emerging recently and to look for ways to take advantage of it. Recently, the emergence of various O2O services that utilize ICT technology of smartphone has attracted a lot of consumers. The study analyzed the characteristics of the O2O service and evaluated whether user satisfaction changes according to use safety. This study carried out a structured questionnaire, by collecting the material for the 421 general public in the country. Hypothesis tests showed that 4 characteristic of O2O services have positive impact on user satisfaction and regression analysis showed accuracy of information and pleasure have significant impact on user satisfaction. After cleaning up of these findings and discussing the theoretical and practical implications, this study provides direction for future research.

• Journal of Digital Convergence
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• v.16 no.7
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• pp.231-241
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• 2018

Free from limitations of time and space, diet management with smartphones can be highly useful for college students. This study aimed to improve the utility of diet related apps by efficacy and app evaluation after using the apps for 2 weeks. Results showed that the intent for continuing use apps was low, and the lack of efficacy indicated the currently developed apps had not significantly influenced their motivating healthy diet. Average app rating was $3.12{\pm}0.85$. Among 4 rating factors, convenience and contents were relatively higher than usefulness and community. Especially, there was significant difference in contents and convenience according to gender, contents and community according to BMI and previous diet experience. In the future, considering the needs and characteristics of college students, we need to find ways to enhance the usefulness of the app and to strengthen the social networking.

• Journal of Digital Convergence
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• v.19 no.9
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• pp.271-276
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• 2021

This study is about finding factors affecting user experience in China's mobile payment. The recen development of 5G networks and the spread of phones provide the basis for the development of mobile payment, and the development of mobile payment is showing a rapid upward trend. Because of the simplicity and mobility, it is appealing to people, especially young people. Therefore, this study conducted a survey on mobile payment users in 20s and 30s and confirmed the factors affecting the user experience through regression analysis. Unlike previous studies on mobile payment technology, this study focused on user experience and identified factors affecting user experience, so it is expected to be helpful in the development of mobile payment in China.

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.61-68
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• 2018

As the smartphone and mobile environment develop, the time and space constraints for individual work performance are disappearing. Companies can reduce costs and expand their business quickly through cloud computing. As the use of various cloud expands, the boundaries of users, data, and applications are disappearing. Traditional security approaches based on boundaries (Perimeter) are losing their utility in the cloud environment. This paper describes the limitations of existing network access control (NAC) in a cloud environment and suggests network security technology that complements it. The study explains the SDP and combines SDP(Software Defined Perimeter) to overcome the limitations of NAC, while at the same time explaining its role as a new framework for supporting the cloud environment. The new framework proposed in this paper suggests a software-based network security solution that supports physical and software parts, providing identity-based access control, encrypted segment management, and dynamic policy management, not IP-based.

• Journal of Digital Convergence
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• v.17 no.6
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• pp.327-333
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• 2019

The purpose of this study is to suggest areas for improvement of KakaoTalk. KakaoTalk is used by everyone in Korea, and even elementary school students have been using it a lot recently. Therefore, to help parents feel safe about their children using KakaoTalk, and to ensure that children are not worried about their parents when using them, I would like to examine each user's experience to pinpoint the problem. As a method of study, a survey and interview was conducted on eight parents and eight children using KakaoTalk. Through this, the parents could not trust KakaoTalk in terms of reliability when they saw their children using KakaoTalk. Based on this research, we hope to improve KakaoTalk through further research so that parents and children can use Kakao Talk safely.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.41-44
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• 2019

Most of the financial transactions in modern society are traded online, and offline transactions can be made with cards and smart phones in addition to cash transactions. The advantage of monetary transactions on-line is that the purchasing process is simple, volume increases due to cash, and mobility degradation factors such as weight disappear. However, the online environment has no limitation on the physical distance, and there is a problem that if personal information is exposed to another person, it can be directly connected with financial loss. Of course, in most financial sectors, there is no problem because security policies are prepared for financial accidents. In this paper, we show that it is possible to prevent stealing of encrypted information and to operate with a simple structure by arbitrarily changing the fixed card number, expiration date, and CVC every time using OTP.