• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.8
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• pp.738-745
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• 2014

Recently, mobile users continuously increase, and mobile applications also increase As mobile applications increase, the mobile users used to store sensitive and private information such as Bank information, location information, ID, password on their mobile devices. Therefore, recent malicious application targeted to mobile device instead of PC environment is increasing. In particular, since the Android is an open platform and includes security vulnerabilities, attackers prefer this environment. This paper analyzes the performance of malware detection system applying linear SVM machine learning classifier to detect Android malware application. This paper also performs feature selection in order to improve detection performance.

• Asia-Pacific Journal of Business
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• v.9 no.2
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• pp.123-136
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• 2018

The purpose of this study is to investigate the effects of six factors (accuracy, perceived usefulness, perceived ease of use, security, instant accessibility, and ease of use) on re-use intention; and then to help to establish future marketing strategy. In order to achieve the study's objectives, this study conducted an online questionnaire on the Internet, Wenjuanxing. The total of 270 copies through APP-Wechat (Wicket), and 245 were used for analysis. For statistical processing, SPSS22.0 is used to analyze the influence relationship amongst factors for mobile tourism information service, a variety of analysis, such as factor analysis, reliability analysis, mass regression analysis, simple regression analysis were employed. The results of this study are summarized as follows. As a result of analyzing the factors affecting the satisfaction of consumers using chinese Ctrip mobile app, the perceived usefulness and perceived ease of use of mobile tourism information service attributes have a significant effect on user satisfaction. The accuracy of mobile information service were found to have no significant effect on satisfaction. The security, immediacy of access, and usability of the payment service of mobile APP were found to have a significant effect on satisfaction. And customer satisfaction has a significant effect on re-use intention.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.5
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• pp.836-858
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• 2010

Web Services allow a user to integrate applications from different platforms and languages. Since mobile applications often run on heterogeneous platforms and conditions, Web Service becomes a popular solution for integrating with server applications. However, because of its verbosity, XML based SOAP messaging gives the possible overhead to the less powerful mobile devices. Based on the mobile client's behavior that it usually exchanges messages with Web Service continuously in a session, we design the Handheld Flexible Representation architecture. Our proposed architecture consists of three main components: optimizing message representation by using a data format language (Simple_DFDL), streaming communication channel to reduce latency and the Context-store to store context information of a session as well as redundant parts of the messages. In this paper, we focus on the Context-store and describe the architecture with the Context-store for improving the performance of mobile Web Service messaging. We verify our approach by conducting various evaluations and investigate the performance and scalability of the proposed architecture. The empirical results show that we save 40% of transit time between a client and a service by reducing the message size. In contrast to solutions for a single problem such as the compression or binarization, our architecture addresses the problem at a system level. Thus, by using the Context-store, we expect reliable recovery from the fault condition and enhancing interoperability as well as improving the messaging performance.

• Convergence Security Journal
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• v.8 no.4
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• pp.167-179
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• 2008

As ubiquitous technology develops, there are many studies to provide various contents proper to users through a mobile device. However, there is a limit of information provision due to a small user interface of a mobile device. This study proposes a system that can solve a problem and provide an intelligent agent model appropriate to a mobile environment and job information positively that an individual user is interested. It is composed of a personalization engine to monitor users' behavior patterns and a learning algorithm to provide information to a mobile device. Analysis shows that preferred job items are different by sex, age and education, while a region affects job searching significantly.

• International Journal of Control, Automation, and Systems
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• v.6 no.5
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• pp.713-721
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• 2008

This paper presents the robust velocity estimation of an omnidirectional mobile robot using a polygonal array of optical mice that are installed at the bottom of the mobile robot. First, the velocity kinematics from a mobile robot to an array of optical mice is derived as an overdetermined linear system. The least squares velocity estimate of a mobile robot is then obtained, which becomes the same as the simple average for a regular polygonal arrangement of optical mice. Next, several practical issues that need be addressed for the use of the least squares mobile robot velocity estimation using optical mice are investigated, which include measurement noises, partial malfunctions, and imperfect installation. Finally, experimental results with different number of optical mice and under different floor surface conditions are given to demonstrate the validity and performance of the proposed least squares mobile robot velocity estimation method.

• Annual Conference of KIPS
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• 2006.05a
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• pp.1081-1084
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• 2006

MVPN(Mobile Virtual Private Network)은 이동단말을 사용하는 이동근무자가 지역적 제한 없이 VPN 서비스를 제공받을 수 있도록 하는 기술이다. 현재 IPsec-based VPN의 비중을 고려해볼 때, MVPN 기술은 Mobile 사용자에게 이동성을 제공하기 위한 Mobile IP프로토콜과 IPsec 기반 VPN 기술의 공존이 주된 연구 내용이다. mobile IP가 IPsec-based VPN GW(Gateway)와 동작할 경우 비호환성 문제가 발생한다. IETF에서는 두 프로토콜 간의 비호환성을 해결하기 위해VPN GW의 외부에 홈 에이전트(x-HA)를 새롭게 추가하는 방안이 연구되고 있다. 이에, AAA(Authentication, Authorization, Accounting) 서버를 이용하여 신뢰성 있는 x-HA를 동적으로 할당하는 방안이 제시되었으나, 세션 키의 외부 노출과 네트워크 간 이동 시 최초 핸드오프 시간이 오래 걸리는 한계를 지닌다. 본 논문은 이와 같은 문제점을 해결하여 이동하는 원격 VPN 사용자에게 보다 안전하며 핸드오프 지연시간이 최소화된 통신을 제공하는 방안을 제안한다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.9 no.4
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• pp.131-140
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• 2010

Recently, mobile wireless data traffic has been dramatically increased due to not only the popularization of digital convergence devices including smart phone, Net-book, and Tablet PC, but also the vitalization of wireless Internet related eco-systems such as AppStore. In addition, it is expected that a tremendous increase in mobile data is caused by the release of unlimited mobile data plans (flat-fee). In order to deal with such mobile data traffic explosion, it is necessary that network operators should make efforts to offload wireless data traffic. This paper reviews the condition of mobile wireless data traffic in domestic and international telecommunication industry and looks for various action plans to overcome the difficulty of network operators.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.401-405
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• 2003

Mobile IP is proposed to support IP mobility by IETF. In this article we proposed to minimize delay and packet loss during the handoff by using of fast handoff mechanism. we analyzed performance of basic handoff and proposed handoff by using ns-2 simulator. This proposed mechanism can used the base of research to support efficient handoff under Mobile IPv6 Environment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.481-484
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• 2003

For map services in the mobile environment, it should be considered that resource restriction of the mobile device. Thus, if a map database dedicated to mobile services may not be developed, the spatial data extracted from general map databases should be simplified before transmitting. This paper suggests the mechanism to simplify and modify the spatial data, which are changed to be able to displayed on the mobile devices. This mechanism is based on the map generalization operations and is refined to adapt on mobile phone environment.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.304-307
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• 2015

Virtualization lacks capabilities for enabling the application to scale efficiently because of new applications components which are raised to be configured on demand. In this paper, we propose an architecture that affords mobile app based on nomadic smartphone using not only mobile cloud computing-cloudlet architecture but also a dedicated platform that relies on using virtual private mobile networks to provide reliable connectivity through Long Term Evolution (LTE) wireless communication. The design architecture lies with how the cloudlet host discovers service and sends out the cloudlet IP and port while locating the user mobile device. We demonstrate the effectiveness of the proposed architecture by implementing an android application responsible of real time analysis by using a vehicle to applications smart phones interface approach that considers the smartphones to act as a remote users which passes driver inputs and delivers outputs from external applications.