• 한국정보과학회논문지:소프트웨어및응용
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• 제31권10호
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• pp.1276-1285
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• 2004

본 논문에서는 웹 브라우저를 통하여 모바일 기기에서 수행하도록 개발한 소프트웨어 컨텐츠의 모바일 적합성을 분석하는 시스템의 구현을 위한 모델을 제시한다. 컨텐츠의 모바일 적합성은 컨텐츠가 모바일 기기에서 실행되기에 적절하도록 개발되었는가를 말하는 것으로, 아무리 좋은 컨텐츠라도 모바일 기기에서 실행되기에 부적절하다면 서비스를 할 수 없으므로 컨텐츠의 모바일 적합성에 대한 분석은 매우 중요하다. 본 논문에서는 컨텐츠의 모바일 적합성 분석 범주를 제시하여 컨텐츠의 모바일 적합성 분석을 위한 가이드로 사용할 수 있도록 하고, Factory Method 패턴과 Facade 패턴을 바탕으로 모델을 만들고, 모델의 각 클래스간의 협력 관계를 통하여 컨텐츠의 모바일 적합성 분석을 위한 작업 수행 흐름을 보여 준다. 또한 모델의 구현을 위해 필요한 최소한의 자바 API를 제시하여 자바를 이용한 시스템의 구현에 사용할 수 있도록 하였으며, HDML로 작성된 컨텐츠의 모바일 적합성 분석 시스템을 구현하여 활용하는 사례를 보였다. 본 논문에서 제시한 모델은 새로운 종류의 컨텐츠에 대한 분석 모듈을 추가하거나 기존의 모듈을 제거하는 것을 쉽게 할 수 있도록 유연성을 가진 모델이며, JSP와 자바 빈을 기반으로 설계된 모델이므로, EJB나 다른 기술을 이용하여 개발할 필요가 있다면 모델을 확장시켜 시스템을 구현할 수도 있다.

• 정보교육학회논문지
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• 제12권1호
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• pp.99-107
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• 2008

초고속 유선 인터넷의 발달과 더불어 각광을 받고 있는 온라인 학습을 넘어 현재 휴대인터넷 (WiBro)과 UMPC (Ultra Mobile PC)를 비롯한 모바일 환경에서의 학습이 활발해지고 있다. 또한 최근 학생들은 점차 일방적인 주입식 교육보다는 상호작용적이며 즉각적인 피드백을 받을 수 있는 게임적 요소에 큰 관심을 보이고 있다. 본 연구에서는 학습자의 특성을 고려하여 모바일 학습에서 학습자의 학습 동기를 유발, 지속시키기 위한 방안으로써 Keller의 동기 유발 이론에 기초한 게임 전략을 접목시킨 새로운 동기 모형을 제시하여 학교 현장에 적용하였다.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제11권4호
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• pp.229-237
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• 2011

As smart phones have become widely adopted, they have brought about changes in individual lifestyles, as well as significant changes in the industry. As the mobile technology of smart phones has become associated with all areas of industry, it is not only accelerating innovation in other industries such as shopping, healthcare service, education, and finance, but is also creating new markets and business opportunities. The preparation of thorough security measures for smart phones is increasing in demand. While offering excellent mobility and convenience, smart phones can be exposed to a range of violation threats. In particular, it is necessary to make efforts to develop a security system that can preemptively cope with potential security threats in the banking service area, which requires a high level of reliability. This paper suggests a security reference model that is considered for the smart phone-based joint mobile banking development project being undertaken by the Bank of Korea in 2010. The purpose of this study is to make a security reference model for a reliable smart phone-based mobile financial service, by recognizing the specific security threats directed toward smart phones, and providing countermeasures to these security threats. The proposed mobile banking security reference model is useful in improving system security by systematically analyzing information security threats to the mobile financial service, and by presenting the guideline for the preparation of countermeasures.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.753-758
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• 2005

This study attempts at building an integrated GIS computing framework for evaluating space-time accessibility of an individual with the approach of time geography model. The proposed method is based on the integration of mobile GIS and object-relational spatio-temporal database. Three components are central to our system: ( i ) mobile GIS application that transmits spatio-temporal trajectory data of an individual; ( ii ) spatio-temporal database server that incorporates the time geography model; and (iii) geovisualization client that provides time geographic queries to the spatio-temporal database. As for the mobile GIS application, spatio-temporal trajectory data collected by GPS-PDA client is automatically transmitted to the database server through mobile data management middleware. The spatio-temporal database server implemented by extending a generic DBMS provides spatio-temporal objects, functions and query languages. The geovisualization client illustrates 3D visual results of the queries about space-time path. space-time prism and space-time accessibility. This study shows a method of integrating mobile GIS and DBMS for time geography application, and presents an appropriate spatio-temporal data model for evaluating space-time accessibility of an individual.

• International Journal of Control, Automation, and Systems
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• 제6권1호
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• pp.86-100
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• 2008

Most of the previously employed dynamic modeling approaches, including Natural Orthogonal Complement Algorithm, have limitations on their application to the mobile robot, specifically at singular configurations. Also, in their dynamic modeling of mobile robots, wheel dynamics is usually ignored assuming that its dynamic effect is negligibly small. As a remedy for this, a singularity-free operational space dynamic modeling approach based on Lagrange's form of the D' Alembert principle is proposed, and the singularity-free characteristic of the proposed dynamic modeling is discussed in the process of analytical derivation of the proposed dynamic model. Then an accurate dynamic model taking into account the wheel dynamics of the omni-directional mobile robot is derived, and through simulation it is manifested that the effect of the wheel dynamics on the whole dynamic model of the mobile robot may not be negligible, but rather in some cases it is significantly large, possibly affecting the operational performances of dynamic model-based control algorithms. Lastly, the importance of its accurate dynamic model is further illustrated through impulse analysis and its simulation for the mobile robot.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2003년도 추계학술대회 및 정기총회
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• pp.74-78
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• 2003

In this paper, we have developed a technology-service relationship model which describes the diffusion process of a group of services and relevant technologies, and have applied the developed model to the prediction of the number of subscribers to the next generation mobile service. The technology-service relationship model developed in this paper incorporates the developing process of relevant technologies, a supply-side factor, into the diffusion process of specific services, while many diffusion models and multi-generation diffusion models in previous researches are mainly reflect the demand-side factors. So, the proposed model could effectively applied to the telecommunication services where the developing of the relevant technologies are very essential to the service penetration. In our application, the proposed model provides a competitive substitution between the next generation mobile service and the traditional mobile service.

• Journal of Computing Science and Engineering
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• 제3권4호
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• pp.260-277
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• 2009

In this paper we propose a model for checking integrity constraints of mobile databases called Three-Level (3-L) model, wherein the process of constraint checking to maintain the consistent state of mobile databases is realized at three different levels. Sufficient and complete tests proposed in the previous works together with the idea of caching relevant data items for checking the integrity constraints are adopted. This has improved the checking mechanism by preventing delays during the process of checking constraints and performing the update. Also, the 3-L model reduces the amount of data accessed given that much of the tasks are performed at the mobile host, and hence speeds up the checking process.

• 한국정밀공학회지
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• 제19권7호
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• pp.28-35
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• 2002

This paper deals with kinematic modeling of a car-like planar mobile robot consisting of four conventional fixed wheels attached on two parallel axles. The kinematic model of such a mobile robot requires the description of skidding and sliding frictional motion. Previous kinematic model proposed by Muir and Newman$^{[1]}$ does not include such frictional motions. Thus, does it result in least square solution in estimating a sensed forward velocity solution. A modified kinematic model is proposed by incorporating transnational friction motion into the original algorithm. It is shown that transnational friction motions should be included into kinematic model of the mobile robot to represent its real physical motion.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2022년도 춘계학술발표대회
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• pp.517-519
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• 2022

In 5G network environment, proactive mobility management is essential as 5G mobile networks provide new services with ultra-low latency through dense deployment of small cells. The importance of a system that actively controls device handover is emerging and it is essential to predict mobile trajectory during handover. Sequence-to-sequence model is a kind of deep learning model where it converts sequences from one domain to sequences in another domain, and mainly used in natural language processing. In this paper, we developed a system for predicting mobile trajectory in a wireless network environment using sequence-to-sequence model. Handover speed can be increased by utilize our sequence-to-sequence model in actual mobile network environment.

• 한국IT서비스학회지
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• 제13권4호
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• pp.325-340
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• 2014

Mobile payment system using NFC attracted attention as the mobile payment market grows due to the fast diffusion of smart phones. However, non NFC mobile payment recently appeared because of the slow growth of infrastructure for NFC. With advent of Non NFC mobile payment applications, mobile payment industry is in developing trend. Non NFC mobile payment revitalizes the market by overcoming the limit of NFC with the smart applications using bar code and QR code payment, and providing various discounts, membership benefits and payment information. Therefore, this paper analyzed the intention of continuous use with the quality of mobile payment application based on the information system success model. Three categories of factors which are system quality, service quality, and information quality were used. We verified the significance of the factors affecting the intension of continuous use. mainly, quality of information was considered as an important factor of continuous Intention to Use. Also, unlike previous NFC, it was found that in Non-NFC, compatibility might not be as important factor. Moreover, we suggest a marketing strategy of companies for mobile payment industry which focus on information quality. and future research directions for non NFC payment market.