• The Journal of Korean Association of Computer Education
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• v.20 no.3
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• pp.35-46
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• 2017

The purpose of this study is to analyse the longitudinal relations between creativity, academic achievements, and utilization of computer & smartphone of middle school students. For this purpose, multivariate latent growth model was verified, using three year longitudinal panel data of Seoul Educational Longitudinal Study(2013-2015). Results indicated that the more students in their first year used computer & smartphone, the better scores they obtained on the creativity and academic achievements. As their grade goes up, while the growth rates of using computer & smartphone and creativity were related positively, the growth rates of using computer & smartphone and academic achievements -even though it was not statistically significant- were related negatively. In addition, the first year students, who obtained high level of scores on the creativity, obtained high level of scores on academic achievements, but this tendency was not significant as their grade goes up.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.9
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• pp.2213-2221
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• 2015

The ondemand governor used in android-based smartphone platforms is a CPU frequency scaling technique. The ondemand governor sets the CPU operating frequency depending on the CPU utilization rate. Job scheduling affects the CPU utilization rate. The power consumption is proportional to the value of operating frequency. Consequently, CPU frequency scaling and CPU utilization rate have an effect on power consumption in a smartphone. In this paper, we evaluated the performance of job scheduling techniques incorporating the ondemand governor in terms of CPU utilization, power consumption, and job deadline miss ratio.

• Journal of Digital Convergence
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• v.19 no.6
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• pp.213-223
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• 2021

In this study, a smartphone utilization system was designed to explore ways to use smartphones owned by more than 95% of Korean teenagers in school classes. First, the necessary functions were selected based on the factors related to adolescents and the factors of distraction, dependence, motivation, and cooperation in the preceding studies on the use of smartphone classes, and then three versions of the application were composed according to the educational roles of students, teachers, and parents. By using these applications, students can learn self-study, motivate learning, and actively interact, teachers can be more closely with students and facilitate lessons while giving detailed feedback, and parents can check the student's safe learning using smartphones. It is hoped that this measure will help to increase the educational effect by activating the use of smartphones in school classes.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.35-38
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• 2011

본 연구는 교육현장의 교수자가 직접 앱 저작도구를 이용하여 교안 및 교육 내용을 개발하여 학생들이 시간과 장소에 상관없이 효율적인 학습을 하도록 하는데 있다. 현재 스마트폰이나 태블릿을 이용한 교육에 관심이 많으나 영역 전문가인 교사와 프로그램을 개발하는 개발자 사이에 의사 교환의 어려움 등으로 인해, 만족스러운 양과 질의 컨텐츠 개발이 이루어지고 있지 않다. 따라서 교수자는 앱을 프로그래머에 의뢰하지 않고 저작도구를 이용하여 DIY(Do It Yourself) 앱을 개발함으로서 학습내용을 충분히 만족하며, 강의 진행중에서 컨텐츠 변경이 용이하며, 교수자와 학습자와의 커뮤니케이션의 효과와 학습능률을 높이고자 한다.

• Journal of Intelligence and Information Systems
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• v.19 no.3
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• pp.45-55
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• 2013

Thereby using smartphone and mobile device be more popular the more people utilize mobile device in many area such as education, news, financial. In January, 2007 Apple release i-phone it touch off rapid increasing in user of smartphone and it create new market and these broaden its utilization area. Smartphone use WiFi or 3G mobile radio communication network and it has a feature that can access to internet whenever and anywhere. Also using smartphone application people can search arrival time of public transportation in real time and application is used in mobile banking and stock trading. Computer's function is replaced by smartphone so it involves important user's information such as financial and personal pictures, videos. Present smartphone security systems are not only too simple but the unlocking methods are spreading out covertly. I-phone is secured by using combination of number and character but USA's IT magazine Engadget reveal that it is easily unlocked by using combination with some part of number pad and buttons Android operation system is using pattern system and it is known as using 9 point dot so user can utilize various variable but according to Jonathan smith professor of University of Pennsylvania Android security system is easily unlocked by tracing fingerprint which remains on the smartphone screen. So both of Android and I-phone OS are vulnerable at security threat. Compared with problem of password and pattern finger recognition has advantage in security and possibility of loss. The reason why current using finger recognition smart phone, and device are not so popular is that there are many problem: not providing reasonable price, breaching human rights. In addition, finger recognition sensor is not providing reasonable price to customers but through continuous development of the smartphone and device, it will be more miniaturized and its price will fall. So once utilization of finger recognition is actively used in smartphone and if its utilization area broaden to financial transaction. Utilization of biometrics in smart device will be debated briskly. So in this thesis we will propose fingerprint numbering system which is combined fingerprint and password to fortify existing fingerprint recognition. Consisted by 4 number of password has this kind of problem so we will replace existing 4number password and pattern system and consolidate with fingerprint recognition and password reinforce security. In original fingerprint recognition system there is only 10 numbers of cases but if numbering to fingerprint we can consist of a password as a new method. Using proposed method user enter fingerprint as invested number to the finger. So attacker will have difficulty to collect all kind of fingerprint to forge and infer user's password. After fingerprint numbering, system can use the method of recognization of entering several fingerprint at the same time or enter fingerprint in regular sequence. In this thesis we adapt entering fingerprint in regular sequence and if in this system allow duplication when entering fingerprint. In case of allowing duplication a number of possible combinations is $\sum_{I=1}^{10}\;{_{10}P_i}$ and its total cases of number is 9,864,100. So by this method user retain security the other hand attacker will have a number of difficulties to conjecture and it is needed to obtain user's fingerprint thus this system will enhance user's security. This system is method not accept only one fingerprint but accept multiple finger in regular sequence. In this thesis we introduce the method in the environment of smartphone by using multiple numbered fingerprint enter to authorize user. Present smartphone authorization using pattern and password and fingerprint are exposed to high risk so if proposed system overcome delay time when user enter their finger to recognition device and relate to other biometric method it will have more concrete security. The problem should be solved after this research is reducing fingerprint's numbering time and hardware development should be preceded. If in the future using fingerprint public certification becomes popular. The fingerprint recognition in the smartphone will become important security issue so this thesis will utilize to fortify fingerprint recognition research.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.421-422
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• 2011

본 논문은 스마트폰을 이용하여 학습할 수 있도록 이진수 구하기 앱을 구현하여 수업시간에 도구로 활용하고 학생들이 흥미를 높이고자 제작하였다. 작성과정과 완성된 결과를 지도학생들이 테스트해 본 결과 게임을 하는 듯한 학습과정에 만족한 결과를 보였다. 본 앱의 개발과정은 전공의 이론과 공식을 학습하는데, 적용 가능하며 필수암기 부분을 앱을 구현하여 학생들에게 배포하거나, 레포트로 수업관련 앱을 개발하는 과제를 주는데 활용하여도 효과적이다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.12
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• pp.197-204
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• 2011

In this paper, There is a study of a smartphone-based App for e-learning when the process control of manufacturing. First, That is obtained the control limit lines after inputted by the measured data and able to look up the assignable causes and then can display those causes. A User of this App can access the record about assignable causes using the record menu and can use with an e-Learning tool. Because that were provided in the form of a control process theory and bulletin announcements. Helped to exchange information. In addition, the user's guide how to use this App. The result of this process control is provided by charts. The alarm message to the alertsymbol, depending on the level of color clearly was designed to UI which displays the results. After the questionnaire responses with respect to satisfaction of Utilization and satisfaction of the learning experience. The Utilization' satisfaction results Appeared that 82% of the participants were satisfied. And The learning's satisfaction results Appeared that 90% of the participants were satisfied.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.305-308
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• 2011

본 논문은 고객관리 정보를 관리하기 위해 휴대하기 간편한 스마트폰으로 고객의 정보를 입력 및 관리하고 상품에 대한 간략한 설명을 스마트폰으로 활용하고자 본 연구를 수행하였으며, 테스트를 수행하기 위해 안드로이드 기반 보험고객관리 앱을 구현하여 활용성을 검증하였다. 보험설계자의 개인적 특성에 맞게 필드를 구성하여 맞춤형으로 정보를 등록하여 놓고 검색을 통해 고객의 기념일, 특성 등을 확인하여 미팅이나, 보험상품의 권유에 활용할 수 있다. 본 고객관리 앱은 모든 CRM(Customer Relationship Management)분야에 활용 가능하며 필드를 정비하여 계약자의 정보가 보험사의 가입자 정보와 연동되도록 확장하면 업무의 절차가 간소화 될 수 있을 것이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.1529-1531
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• 2011

최근 일본에서 발생한 대지진으로 인해 재난에 대한 경각심이 커지면서 그에 대한 대비로 어떻게 하면 재난 정보를 신속 정확하게 많은 사람들에게 전달할지 관심이 많아지고 있다. 본 논문에서는 스마트폰의 장점과 재난 정보를 제공하는 애플리케이션 그리고 재난방송 온라인 시스템을 분석 및 조사하였고, 스마트폰의 기능들을 활용해 재난방송의 효율을 극대화 할 수 있는 방법을 제안하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.129-134
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• 2015

This paper analyzes file access characteristics of smartphone apps and finds that a large portion of file writes are performed only once. Based on this observation, we present a new buffer cache management scheme that considers this characteristics. Buffer cache improves storage performance by maintaining hot file data in memory thereby servicing subsequent requests without storage accesses. However, it should flush modified data to storage in order to resist system crashes. The proposed scheme evicts cache data that has been written only once upon flushes, thus improving cache space utilization. Simulation experiments show that the proposed scheme improves cache hit ratio by 5-33% and power consumption by 27-92%.