• Journal of Digital Convergence
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• v.9 no.4
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• pp.1-8
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• 2011

A mobile device is a handheld device, typically having a display screen with touch input and/or a miniature keyboard and accessible to the Internet. Because mobile devices are innovative and rapidly changing products, consumers are confronted with a decision-making problem to select the best device. This paper proposes an Analytic Hierarchy Process method to assess mobile devices and shows a method to select best mobile devices when purchasing. For this paper, the mobile devices considered as in the AHP model included net-book, tablet PC, smart phone, and camera phone. We derived 6 main criteria and 15 sub-criteria to synthesize the overall priority of criteria and mobile devices. The criterion of convenience in carrying showed the highest rank in the criteria. Although smart phones had the highest priority, the four mobile devices did not show significant differences in consumer preference.

• Journal of the Korea Society of Computer and Information
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• v.14 no.7
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• pp.123-132
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• 2009

The perforrnance and portability of mobile applications can be greatly increased by adopting proxy modiles which exists between the conventional system and the device. When mobile devices collaborate with the conventional computers, there are problems to address: a battery life problem, limited input and output methods, and intermittent wireless connection. Those issues are magnified in the multimedia collaboration environment since it works in a real-time condition and the size of the message in the system is big in many cases. Additionally, because multimedia collaboration system softwares are too heavy and complex for mobile devices, it is veη hard to integrate them with conventional systems. In this paper, we describe our design and its implementation of a novel approach to map events (i.e. messages) using a proxy for mobile applications. We adopt a proxy to provide a content adaptation (i.e. transcoding) where the message contents are customized. Also, we design a mobile version publish/subscribe system to provide communication service for mobile device in loosely coupled and flexible manner. We present our empirical results which show that our design can be efficiently implemented and integrated with a conventional multimedia collaboration system.

• The Journal of Korean Association of Computer Education
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• v.15 no.6
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• pp.53-64
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• 2012

This study was to compare and analyze actual conditions and awareness of high school students' mobile learning. Survey was used as a research method and percentile, t-test and F-test were conducted for the statistical analyses. Results revealed that in the case of actual conditions on mobile device and mobile learning, slight differences were shown in various sub-variables, depending on independent variables (gender, grade, track); year 2010 can be the most important year for the mobile learning; high school students seldom utilize mobile learning in a small piece of time; mobile learning using Apps was not widespread yet. In the case of awareness of mobile learning, statistically significant differences were found in the use capacity of mobile devices, the increase of learning performance, and the continual interests of mobile devices.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.935-937
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• 2013

Currently, depending on the penetration of the mobile device, age of one person one mobile device is open. It is a time when mobile equipment is located to the depths of human life that much. However, equipment for new mobile devices full of, was in the existing, tend to sleeping in the house or abandoned. It is determined that you build one server in a mobile device that individuals have, to be able to break out of the framework of the existing service Twitter and blogs, such as Facebook, and to create multiple Web services with a personality of their own. In this paper, we studied a scheme that can be instead of a simple fixed server, considering the characteristics of only the mobile device and take advantage.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.366-369
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• 2007

위치정보는 사용자에게 유용한 서비스를 제공하는데 필요한 주요 컨텍스트 중의 하나로, 이를 얻기 위해 GPS(Global Positioning System)가 널리 사용되고 있다. GPS는 위성신호를 이용하기 때문에 별도의 기지국이 필요 없고 전 세계를 포함하는 넓은 가용범위를 갖지만, 도심과 같이 높은 건물이 많은 지역에서는 수신이 어렵다는 단점이 있다. 본 논문은 주변기기들의 위치정보를 공유 받아 모바일 기기의 GPS 정보손실을 복구하는 알고리즘을 제안한다. 먼저 주변의 모바일 기기나 기지국의 유효한 위치정보를 근거리 통신의 애드혹 네트워크인 스캐터넷을 통해 공유받는다. 그 후, 근거리 통신의 가용범위와 지도상의 지형정보를 함께 고려하여 복구 알고리즘을 통해 자신의 위치를 추측한다. 본 논문에서는 최근 모바일 기기에 기본으로 장착되는 근거리 통신기술인 블루투스(Bluetooth)를 가정하여 시뮬레이션 환경을 모델링 하였으며, 실험결과 제안하는 방법을 통해 손실된 GPS 정보의 상당부분이 복구되는 것을 확인하였다.

• Digital Contents
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• no.9 s.148
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• pp.72-77
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• 2005

IT 분야 중에서도 최근에 기술이 비약적으로 발전한 분야가 모바일 기술이다. 최근에는 개발자들뿐만 아니라 많은 사용자들이 모바일 기술에 대해 큰 관심을 가지고 있다. 모바일 기술의 경우 하드웨어와 소프트웨어가 밀접한 연관이 있으므로 모바일 기기의 발전 과정을 살펴보고 각기기혹은플랫폼에서개발할수있는방법에대해간단히소개한다.

• The Journal of the Korea Contents Association
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• v.13 no.10
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• pp.92-102
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• 2013

The definition of mobile phone was a device that can make and receive telephone calls or messages for communication but it has rapidly developed from communication tool into multi-function device. Especially since release of smart phone, Korea is one of the highest country in the world and the statistics can be interpreted into people positively accept new technology. Therefore it's time to study on usage behavior according to different generation of mobile phone. Based on media richness theory and elaboration likelihood model, we analyzed factors affecting usage behavior of mobile phone. Case study methodology were constructed a survey to female university students from 20-24 years of age.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.3
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• pp.516-528
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• 2015

In this paper, we propose mobile ad hoc network configuration and its autonomous network construction method for efficiency and scalability of media streaming for mobile smart devices. To provide scalable network configuration for streaming traffic distribution, an IEEE 802.11 infrastructure network and ad hoc networks are hierarchically built. The proposed method autonomously configures a hierarchical streaming network by competition based on performance and states of devices and the wireless network, not depending on any specific nodes. Finally, we conduct performance measurement for the proposed configuration and analyze the experimental result.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.398-400
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• 2014

모바일 기기가 점차 발전하고 사람들 사이에 널리 보급되면서 여러 가지 모바일 응용 어플리케이션들을 통하여 모바일기기는 사람들의 많은 개인정보를 담고 있게 되었다. 하지만 이에 따라 이러한 모바일 기기의 정보들을 노리는 악성 코드를 포함한 어플리케이션 또한 점차 늘어나고 있다. 그래서 모바일 환경에서의 악성 코드를 검출하기 위한 여러 가지 많은 연구들이 진행되고 있는데 이번 연구에서는 별도의 수행환경에서 동적 분석을 기반으로 한 악성 코드 검출 연구들을 살펴보도록 하겠다.

• Journal of KIISE
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• v.42 no.6
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• pp.707-712
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• 2015

Mobile cloud computing is a technology that uses cloud services to overcome resource constrains of a mobile device, and it applies the computation offloading scheme to transfer a portion of a task which should be executed from a mobile device to the cloud. If the communication cost of the computation offloading is less than the computation cost of a mobile device, the mobile device commits a certain task to the cloud. The previous cost analysis models, which were used for separating functions running on a mobile device and functions transferring to the cloud, only considered the amount of data transfer and response time as the offloading cost. In this paper, we proposed a new task partitioning scheme that considers the frequency of function calls and data synchronization, during the cost estimation of the computation offloading. We also verified the energy efficiency of the proposed scheme by using experimental results.