• The Journal of the Korea Contents Association
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• v.15 no.6
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• pp.616-631
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• 2015

This study proposes a mobile Augmented Reality (AR)-based "word card" learning tool for children aged 3 to 5. First, this study suggests a learning structure to improve motivation and immersion of learning, Secondly, it designs and implements the user interface applying the proposed learning structure. Also, it designs a content management tool supporting the production of the content so that instructors can easily manage the contents for various learners. This study is conducted by four steps - reference research, design of "word card" learning content for the learner, design of content management tool for the instructor and the effectiveness verification of the proposed content. The proposed content was designed based on an education content architecture for enhancement of immersion and motivation to study. Moreover, it includes an 'AR content management tool for instructor' designed to easily update AR education content. The class for six children aged 3 to 5 was given to validate the enhancement of immersion to study. Experiment results showed that the proposed content enhanced the study immersion and that special interaction design for early children was necessary.

• Journal of Korea Game Society
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• v.17 no.5
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• pp.39-50
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• 2017

This paper explores the concept of mobile gaming platforms and changes in game play through mobile parameters, focusing on the role of role-playing mobile games through mobile parameters. As a move, the Player combines the mobile media with the game platform. The daily time of the mobile mid-dividualization is reconstructed with the principle of superposition, which affects play experience on the mobile gaming platform. The character of a mobile role-playing game plays a non-integrated play where the player is staying, rather than an avatar character, and exhibits a non-dwelling character as a residential space. Automatic battle also regenerates unused combat forces in the form of explicit integration. The experience of combat in overlapping hours serves as a visual spectacle, and the player inhabits the fighter jets.

• Journal of Digital Contents Society
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• v.14 no.2
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• pp.125-134
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• 2013

The mobile device users have been increasing significantly because of the development of Social network system and network technologies. Because of this popularity, there are various games in market based on the combination of the mobile device with social networks. It will be the potential market within the mobile games with the growth of popularity in various users. This paper proposes the possibilities for the development of mobile game in educational contents through the case study of the popular mobile games.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1464-1467
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• 2012

스마트 폰 사용자 수가 2000만명 이상이 됨에 따라 모바일 맵 서비스에 대한 수요가 급증하고 있다. 한편, 모바일 기반의 맵 응용의 개발을 위해선 WINDEV Mobile 17과 같은 유료 개발 환경이 있지만 자동화 지원 경도가 미약하여 맵 응용의 생산성이 떨어지고 유지 보수 기간도 많이 소요된다. 우리가 설계하고 구현한 MobileMapGen은 GoogleMaps API를 사용하며 서버 측을 위해 CMS(Content Management System)인 Drupal 환경에 사용 가능 한 모듈들을 생성하고 클라이언트 측엔 iOS 앱을 생성해 맵 응용에 대한 생산성을 향상시켜 준다. 맵 컨텐츠와 그와 연관된 컨텐츠들을 함께 제공하는 모바일의 맵 응용 생성기인 MobileMapGen과 달리 WINDEV Mobile 17, MobilForms, 그리고 VisualStudio.NET는 맵 인터페이스를 지원하지 않거나 위치 정보 형태만을 표시한다. 그렇기 때문에 사용자가 원하는 지형/지물 컨텐츠 타입을 생성하거나 맵 상에 표시하고 관심의 대상인 지형/지물과 연관된 컨텐츠들을 검색할 수 없다.

• Journal of Distribution Science
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• v.10 no.11
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• pp.89-99
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• 2012

Purpose - Mobile devices, especially mobile terminals capable of telecommunication and wireless connectivity, are leading the advancements in consumer electronics. Digital convergence drives the functions of various devices, such as cellular phones, MP3 players, personal digital assistants, and gaming, into a single device. This trend would continue and applications such as digital audio and video streaming (including personalized content delivery mechanisms) would soon be on a handheld device. As customers want mobile convergence devices, manufacturers are driving new initiatives in the emerging mobile device market. Given the roles played by device design and service content in user satisfaction of a mobile convergence device, this study focuses on identifying and measuring the constructs for the process by which user satisfaction is achieved. This study synthesizes the expectation-disconfirmation paradigm with empirical theories in user satisfaction. Device and service levels are separated, and nine key constructs for user satisfaction of mobile convergence devices are proposed. Insight into this process could help web-based businesses to improve user satisfaction, thus enhancing the effectiveness of e-commerce for sellers and buyers. Research design, data, methodology - This study draws on three users of mobile convergence devices as examples. To test there search model and hypotheses, survey questionnaires were sent to 607 mobile device users. Mobile device users were initially identified from several members, and subjects were randomly drawn. Data from 577 survey responses were finally analyzed. The unit of measurement and analysis in this research study is at a personal level. Results - The measurements for the constructs were developed and tested in a two-phase study. In the first phase, the device and service dimensions were identified, and instruments for measuring them were developed and tested. In the second phase, using the salient dimensions of the device and service as the formulating first-order factors, instruments were developed and empirically tested to measure satisfaction of the device and service. In measuring satisfaction of mobile convergence devices, the critical tasks are to identify the key constructs of such user satisfaction and to develop validated instruments to measure them. Hence, the results of this study have immediate implications for businesses and for research in user satisfaction of mobile convergence devices. Conclusions - This study provides reliable instruments for operationalizing key constructs in the analysis of user satisfaction of mobile convergence devices within the expectation-disconfirmation paradigm. Hence, convergence device makers will be able to examine whether their websites meet their customers' expectations by examining the device aspect of the mobile convergence device customers, and the service aspect expectations and disconfirmation. Moreover, the introduction of expectation and disconfirmation constructs brings the marketing aspect of convergence devices into focus for such retailers, an aspect crucial to the effective design of websites for online businesses. In addition,this study provides the metrics required to initiate future studies on user satisfaction of mobile convergence devices.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2006.07a
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• pp.467-467
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• 2006

• Journal of the Korea Institute of Information Security & Cryptology
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• v.21 no.2
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• pp.27-35
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• 2011

Due to the advancement of IPTV technologies, Mobile IPTV service is needed to be supported for service and content protection. CAS is generally used in the IPTV service to protect service and content. However, the CAS is not efficient in the Mobile IPTV. The CAS needs too much bandwidth for Service Key update to the each subscriber. Moreover, the CAS is increasing computation burden for the service key refreshment in the key management server when the subscriber frequently changes of the IPTV service group. To solve the problems, we used hierarchical key structure based on pre-shared key that is securely stored into smart card or USIM and do not use the EMM for Service Key update. As a result, the proposed scheme decreases computation burden at the key management server and wireless bandwidth burden in the Mobile IPTV service.

• Journal of Information Technology Services
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• v.11 no.2
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• pp.339-353
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• 2012

Mobile communication technology is advancing forward to deliver more connected devices and richer content and applications. The number of subscriptions continues to grow along with an explosive increase in the mobile data traffic demand. Thereby, it creates a significant network capacity shortage concerns for mobile network operators. In order to address this problem, it is essential to increase the network capacity at a low additional cost. The device-to-device (D2D) communication based proximity service is believed to have a promising future mobile communication technology that is capable to create new mobile service opportunities and offload traffic to the eNB. In addition, it is also required to develop new mobile communication services and its business models not only to accommodate the increasing mobile traffic demand but also to foster profitability of mobile business service providers such as the network providers, contents providers and platform providers. In this article, we first analyze current mobile business eco-system in the context of CPNT based value chain. Then, propose service development framework and business model creation methodologies for the device-to-device communication based services in the beyond LTE/LTE-Advanced systems.

• International Journal of Contents
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• v.10 no.3
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• pp.26-34
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• 2014

Mobile learning is a practical learning method for busy adult learners because the mobility of digital devices can overcome the drawbacks of e-learning. However, research is strongly lacking in the theoretical exploration of mobile learning effects and functions and its empirical research. Moreover, the research of learning characteristics and learners' requirements must be considered before applying and disseminating mobile learning into the educational field. To address this shortcoming, this study conducted an online survey with 1,542 officers of the Ministry of Health and Welfare Affairs (MHWA) regarding learner recognition to mobile learning. The analysis of learners' attitudes toward mobile learning, based on age and position, indicated that subordinate workers appeared to place more value on mobile learning. Many participants preferred mobile learning because of its mobility and the effectiveness of anywhere and anytime. However, some participants continue to misunderstand mobile learning and its necessity. Therefore, consideration of learning effectiveness, the form of the content, and learner-centered learning must be reviewed in advance. This study could lead to practical implications of mobile learning.

• ETRI Journal
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• v.35 no.5
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• pp.900-910
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• 2013

Small-screen mobile terminals have difficulty accessing existing Web resources designed for large-screen devices. This paper presents an adaptive transformation method based on webpage semantic features to solve this problem. According to the text density and link density features of the webpages, the webpages are divided into two types: index and content. Our method uses an index-based webpage transformation algorithm and a content-based webpage transformation algorithm. Experiment results demonstrate that our adaptive transformation method is not dependent on specific software and webpage templates, and it is capable of enhancing Web content adaptation on small-screen terminals.