• Journal of Korea Multimedia Society
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• v.23 no.1
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• pp.93-101
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• 2020

Korea, as a leader of Internet and game sector in IT industry, has been playing an important role in increasing its industrial development. This country has won the first place in wireless broadband usage and contributed to Internet game industry development. This means that Korean use smartphones most. It is juveniles that use Internet and smartphones most among Korean who use teenage., the number of the teenagers who overuse smartphones or Internet has surpassed 200,000. The number of the adolescents who spend more time using smartphone and Internet is about 180,000 and the number of the teens who are over-dependent to smartphone having trouble living their lives is over 22,000. The SNS usage rate of the contents that teens are most likely to use has accounted for over 80 percent. Among teens, SNS is being considered as a major means that builds relationship due to smartphone technology and the prevalence of smartphones. However, the use of SNS among youths has two sides; one is positive, the other negative. Not only does SNS have a positive function that it keeps relationship but it also has a negative function that it can lead to smartphone addiction.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.526-529
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• 2015

as the smartphone industry developed, the smartphone's internal hardware devices have become high-end devices and it requires more power consumption than the previous one. therefore a battery of high capacity needed, but there is a limit in order to equip a large battery on account of smartphone minimization. The Linux Kernel provides the DVFS Mechanism to compensate for these limitations by software techniques. DVFS is dynamically adjust the frequency of the CPU to reduce the power consumption of the CPU. ondemand governor, the default policy in DVFS, apply the maximum frequency of the CPU whenever exceeding the up_threshold. so it result in a waste of CPU resources. by paying attention to this point, this paper propose the mechanism that maintain a high CPU utilization in proportion to the current frequency of the cpu to prevent the waste of CPU resources and conserve energy.

• Journal of Digital Convergence
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• v.15 no.9
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• pp.335-343
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• 2017

Several studies have suggested that lonely adolescents showed higher increases in stress and they easily addicted smartphone utilization for comforting loneliness and stress. Studies, moreover, have claimed that smartphone addiction has negative effects on mental health of adolescents. To contribute to knowledge on these topics, this study is to investigate to the relationship among adolescents' loneliness, stress, and smartphone addiction. To identify test subjects, the study conducted a survey that collected data from Korean adolescents, and the survey of this study was completed between April 1, 2017 and April 15, 2017. A total of 356 adolescents completed the survey, and the final data of empirical test of the study was 327. The empirical results demonstrate that the relationship between loneliness and stress of adolescents is mediated by four sub-factors of smartphone addiction such as difficulty of daily life, directivity of virtual life, withdrawal symptom, and tolerance. The results indicated that a smartphone addiction risk of adolescents was negatively related to their mental health, especially loneliness and stress.

• The Journal of the Korea Contents Association
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• v.13 no.4
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• pp.497-507
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• 2013

According to increasing smartphone users, Public mobile services is expanding across all areas, including education. We have to prepare NEIS(National Education Information System) student and parent service based on smartphone that provide information about student's school life for the smartphone users. Therefore, in this paper, we conducted an online questionnaire survey for student and parent. User's perception for existing services were analyzed by factors of content availability, service utilization, and user affinity. Reliability analysis of the collected data, the results of correlation analysis, and multiple regression analysis were found reliable. The user affinity factor have the most significant impact on user satisfaction and intention to user smartphone service. Consequently, the study stresses a measure of NEIS student and parent service based on smartphone and public education information service through the perception analysis of these.

• 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 Korea Society of Digital Industry and Information Management
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• v.19 no.3
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• pp.37-44
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• 2023

In the future society, a means to verify the identity of the information owner is required at the beginning of most services that the information owner encounters, and the emergence and gradual spread of digital identification that proves the identity of the information owner is essential. In addition, as the utilization value of personal information increases, discussions on how to provide personal information are active. Therefore, there is a need for a personal information management method necessary for building a hyper-connected society that is safe from various hacking, forgery, alteration, and theft by allowing the owner to directly manage and provide personal information management. In this study, a decentralized identity information management model that overcomes the problems and limitations of the centralized identity management method of personal information and manages and selectively provides personal information by the information owner himself and implemented a smart personal information provision system(SPIPS: Smart Personal Information Provision System) using a smartphone.

• 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.

• Spatial Information Research
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• v.20 no.4
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• pp.57-67
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• 2012

Recently, market of mobile spatial information service is increasing along with enlargement of geo-spatial information utilization area and spread of smartphone. In particular, smartphone users look forward to utilizing spatial information service more easily and conveniently. Korea has the potential for spatial information technology development, but does not have enough governmental support to develop various spatial information service in mobile network environment. Hence, it is need to make governmental support plans for utilizing mobile services and promoting the related industry base on mobile spatial information. In this paper, we propose governmental action plans for utilizing mobile services and promoting the related industry by surveying mobile application/web services and analyzing demands of mobile spatial information experts.

• Journal of Multimedia Information System
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• v.6 no.4
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• pp.265-270
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• 2019

The technology to locate an individual has enabled various services, its utilization has increased. There were constraints such as the use of separate expensive equipment or the installation of specific devices on a facility, with most of the location technology studies focusing on the accuracy of location verification. These constraints can result in accuracy within a few tens of centimeters, but they are not technology that can be applied to a user's location in real-time in daily life. Therefore, this paper aims to track the locations of smartphones only using the basic components of smartphones. Based on smartphone sensor data, localization accuracy that can be used for verification of the users' locations is aimed at. Accelerometers, Wifi radio maps, and GPS sensor information are utilized to implement it. In forging the radio map, signal maps were built at each vertex based on the graph data structure This approach reduces traditional map-building efforts at the offline phase. Accelerometer data were made to determine the user's moving status, and the collected sensor data were fused using particle filters. Experiments have shown that the average user's location error is about 3.7 meters, which makes it reasonable for providing location-based services in everyday life.