• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.335-338
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• 2004

In this paper, we present a perspective of the next generation mobile communication services and its characteristics. As a preliminary research work on the next generation mobile communications and services, we exploit the next generation mobile services [1]. We define the next generation mobile services as strata of services consisting of three different service levels, the service areas, the service functionalities, and the service technologies. We derive these service levels by means of the scenario based analysis. Finally, we propose a conceptual network architecture that can support the next generation mobile services by placing network functions and service elements within the network.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (A)
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• pp.205-207
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• 2002

컴퓨터의 이동성을 지원하기 위해 1996년 IETF (Internet Engineering Task Force)에서 mobile IPv4 를 제정하였고 이에 따른 구현 사례가 등장하였다. 그러나 현재까지 국내외 대학에서 발표된 구현 사례는 주로 유닉스 기반의 플랫폼(리눅스, BSD)에서 개발되었으며 가장 보편적으로 사용되고 있는 운영체제인 윈도우에서, 라우팅 정보가 변경되면 재부팅을 해야 하는 결함때문에 개발에 어려움이 있었다. NT 기반의 윈도우즈가 출시됨에따라 윈도우 플랫폼에서 Mobile IP의 구현이 가능하게 되었으며 본 연구실에서는 윈도우즈 2000 플랫폼에서 Mobile IPv4를 위한 mobile node를 설계하여 POSTECH MIP mobile node를 개발하였다. FOSTECH MIP mobile node는 확장성과 효율성을 목표로 설계되어 커널 스페이스(kernel space)와 유저 스페이스 (user space)에서 동작하도록 구현되었다.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2005년도 추계학술대회 및 정기총회
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• pp.371-387
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• 2005

From early 1999 years, the Mobile Telecommunication Companies have introduced the Mobile Telecommunication Membership Program to attract more customers. However, the severe competition in the Mobile Telecommunication market has made the Mobile Telecommunication Membership Program to be faced with the matured Mobile Telecommunication market and the Mobile Number portability. Main focus of this study is to find what are the core elements of service quality of the Mobile Telecommunication Membership Program. To achieve research objective, we conceptualized the service quality of Mobile Telecommunication Membership Program. We also derived hypotheses regarding the relationships between service quality of the program, customer satisfaction, and customer loyalty and examined it by using the empirical research methodology. We suggest new marketing strategies of the Mobile Telecommunication Membership Program which can be applied to improve the corporate competitiveness.

• 한국통신학회논문지
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• 제27권3C호
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• pp.211-219
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• 2002

Mobile IP(RFC2002)는 호스트에 이동성을 제공하여주는 대표적인 프로토콜이다. 본 논문에서는 공개키 기반의 인증서와 인증기관을 이용한 Mobile IP 등록 프로토콜을 제안한다. 제안된 프로토콜은 이동 노드의 등록 메시지를 인증하고 재전송 공격을 방지하며 공개키 암호화 사용을 최소로 하였다. 또한, 제안 프로토콜은 인증서를 사용하여 에이전트들과 이동 노드들 사이에 직접적인 인증을 할 수 있도록 설계하였다. 컴퓨터 모의 실험을 통하여 제안 프로토콜은 기존에 연구되어진 공개키를 기반으로 하는 Mobile IP 등록 프로토콜보다 통신 성능이 우수함을 알 수 있다.

• 전자공학회논문지S
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• 제34S권10호
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• pp.71-79
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• 1997

This paper introduces a methodology of the precise control of a mobile/task robot using visual information captured bythe camera attached at the hand of the task robot. The major problem residing in the precise control of mobile/task robot is providing an accurate and stable base for the task robot through the precise control of mobile robot. On account of uncertainties on the surface, the precise control of mobile robot is not feasible without using external position sensor. In this paper, the methodology for the precise control of mobile robot is proposed, which recognizes the position of mobile robot using the camera attached at the hand of the task robot. While the task robot is approaching to an assembly part, the position of mobile robot is measured using the line correspondence between the image capturesd by the camera and the real assembly part, and using the kinematic transformation from the hand of the task robot to the mobile robot. To verify the solidness of this method, experimental data for the measurement of camera position/orientation and for the precise control of mobile robot using measurement are shown.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.83-94
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• 2010

Mobile network infrastructure is being completed with the development of hardware and software for mobile devices. Network in mobile devices has evolved for telematics that is expanded much more than its existing concept. Telematics is compound word that is formed from the words "telecommunication" and "informatics". It means that telematics performs control and monitoring service with using mobile device resources. These services provide their services for users' requests through wired or wireless network from mobile devices and server that offers contents and network service collects management information of mobile devices. Map service is one of the preferred services for many telematics users. However, mobile map service has a limit between traffic and information sharing. Therefore it is very important to supply their information for both service provider and terminal user. In this paper, we design a new interactive sketch map using routes and information on the space to be applied effectively, and provide an extended document format that is defined to an extensible and dynamic clustering scheme to have portability map service for mobile device.

• 기술혁신학회지
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• 제8권3호
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• pp.1139-1156
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• 2005

The explosive growth in wireless networks and Internet services has created considerable demand for mobile Internet services based on the mobile phone. Mobile Internet has become the new business model in telecommunication market, therefore the open network policy for mobile Internet has been formulated and implemented by the government in Korea. In spite of the open network policy for mobile Internet, there has been no systematic analysis of the various interconnection issues, including pricing, in mobile Internet network. This paper aims to suggest the interconnection pricing methods for mobile Internet network by reviewing the current pricing models for various communications services, and adapting them to mobile Internet communications circumstances. Results of this paper can be used as a guideline for government policy directions and management decision making after the introduction of the open network policy for mobile Internet.

• Journal of Information Science Theory and Practice
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• 제2권2호
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• pp.33-47
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• 2014

Mobile devices are the most important equipment for accessing various kinds of services. These services are accessed using wireless signals, the same used for mobile calls. Today mobile services provide a fast and excellent way to access all kinds of information via mobile phones. Mobile service providers are interested to know the access behavior pattern of the users from different locations at different timings. In this paper, we have introduced an associated tree for analyzing user behavior patterns while moving from one location to another. We have used four different parameters, namely user, location, dwell time, and services. These parameters provide stronger frequent accessing patterns by matching joins. These generated patterns are valuable for improving web services, recommending new services, and predicting useful services for individuals or groups of users. In addition, an experimental evaluation has been conducted on simulated data. Finally, performance of the proposed approach has been measured in terms of efficiency and scalability. The proposed approach produces excellent results.

• 한국정보처리학회논문지
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• 제7권5S호
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• pp.1657-1665
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• 2000

Mobile agents based e-commerce system has many advantage than traditional e-commerce-information gathering on goods, price settlement and payment, delivery of the goods purchased, and so on. However, due to the security vulnerability that stems from mobile agent's mobility, mobile agents based e-commerce system has additional security problems. Therefore, in order to do e-commerce securely in th system, first of al the security issues on mobile agents must be addressed. It this paper, we propose a mobile agent transfer protocol that provides confidentiality and integrity of mobile agent in transit and mutual authentication for communicating hosts. We further show the security of the protocol against many possible attacks. Also, we suggest the location management mechanism of mobile agents based on the trust center. This mechanism is capable of finding their locations transparently and detecting mobile agent clones.

• 디지털콘텐츠학회 논문지
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• 제11권4호
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• pp.495-501
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• 2010

기존의 게임 시장은 콘솔과 PC 기반의 게임들이 주류를 형성하고 있었다. 모바일 기기의 성능이 향상되면서 휴대폰을 선두로 하는 모바일 게임 시장이 점차 확대되고 있다. 특히 손 안의 컴퓨터로 인식되고 있는 스마트폰의 보급은 모바일 게임 시장의 확대를 가속시키고 있다. 본 논문에서는 모바일 게임시장의 특성과 현황을 살펴보고, 이를 바탕으로 모바일 게임 시장의 발전 방향을 제시하려 한다.