• Journal of Digital Contents Society
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• v.6 no.1
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• pp.19-24
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• 2005

Mobile service is able to offer the elastic service to anyone regardless of the place and the tin. With this characteristics, the ubiquitous service could be also provided even to the place which the access was limited with the existing line service, which could improve the mutual connection and could result in the service extension Mobile communication companies, which realized the limit of sale only by telephone conversation, have made an effort to develop wireless internet with concentration as its alternation. Especially concentrating their effort both to the development of distinctive and various contents and to tin development of system for mobile service such as the mobile banking, mobile game and etc., they have done their best to secure the number of the people using the wireless internet. This study is to propose the electronic account system based on the mobile as a case study of contents production for such a mobile service. This system has its advantage to perform the financial management immediately when the income and outcome happen without limitation of the time and space. The information could be stored, searched and modified by using of the mobile phone for this system was made up for the weak point of the financial management for wired internet.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.7
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• pp.1354-1362
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• 2015

Heterogeneous network technology is expected to be a core technology for 5G mobile communications. 5G mobile network would be composed of many base stations even have mobility, then the operator should connect base stations through the wireless backhaul technology. This paper presents Ultra Wide Area Wireless Backhaul Network System with massive array antenna. We conducted link budget analysis for Ultra Wide Area Wireless Backhaul Network and performance analysis of massive array antenna system through the transmission simulator based on beamforming technology. In wide area ($10km^2$) wireless backhaul system composed of massive antenna, we achieved 5 bps/Hz average spectral efficiency with 1 W transmission power per beam.

• Journal of the Korean Society for Railway
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• v.15 no.5
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• pp.459-466
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• 2012

Due to the issues such as omission of data, document based management, maintenance based on measurement data and wire-based network, it is difficult existing maintenance system for railway bridges to act to diverse characteristics of site and environmental changes in real time. With these reasons, there are many constraints in establishing active maintenance strategies for railway bridges. To solve these issues, this study suggests an integrated maintenance business model based on practical utilization and information management based on BIM technology to build a smart maintenance operation system based on ubiquitous computing for railway bridges. To secure its development and practical applications, a quantitative evaluation by questionnaire analysis was performed. Therefore, it is expected that the suggested model will be utilized as a framework model in order to build the smart maintenance operation system from collection of maintenance data to action for railway bridges.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.5
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• pp.931-939
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• 2014

The Web or Mobile channel of previous Web access authentication system for a payment only provides the authentication of remote users, and does not provide the authentication between a user and a bank/financial institution. Therefore, this paper proposes the Transaction Certificate Mode(TCM) for a payment which can preserve the mutual authentication between a user and a bank/financial institution for Web-based payment systems. The proposed system has designed for wireless network instead of Secure Electronic Transaction (SET) designed for wired electronic transaction. In addition, this system with TCM is able to support an account-based transaction for wireless networks instead of a disadvantage of SET such as a card-based transaction for wired networks. Therefore, customers can check their balances without logging on their bank's web site again due to mutual authentication between a customer and his bank/financial institution.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.5
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• pp.1-6
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• 2009

MANET(Mobile Ad-hoc NETwork), a network characterized that its moving nodes freely constructs Network topology, has other different characteristics. Because Policy based Network Management in MANET guarantees QoS between nodes, it is essential in applied areas like VANET which targets safety and convenience. In this paper, we use COPS-PR which is appropriate Policy Exchange Protocol for MANET, and implement DiffServ-based QoS in the real networks and experiment its capability.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.892-894
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• 2002

본 논문은 유한 체 GF(/2 sup m/)상에서 A$B^2$연산을 위해 AOP(All One Polynomial)에 기반한 새로운 MSB(Most Significant bit) 유선 알고리즘을 제시하고, 제시한 알고리즘에 기반하여 병렬 입출력 세미시스톨릭 구조를 제안한다. 제안된 구조는 표준기저(standard basis)에 기반하고 모듈라(modoular) 연산을 위해 다항식의 계수가 모두 1인 m차의 기약다항식 AOP를 사용한다. 제안된 구조에서 AND와 XOR게이트의 딜레이(deray)를 각각 /D sub AND$_2$/와/D sub XOR$_2$/라 하면 각 셀 당 임계경로는 /D sub AND$_2$+D sub XOR/이고 지연시간은 m+1이다. 제안된 구조는 기존의 구조보다 임계경로와 지연시간 면에서 보다 효율적이다. 또한 구조 자체가 정규성, 모듈성, 병렬성을 가지기 때문에 VLSI 구현에 효율적이다. 더욱이 제안된 구조는 유한 체상에서 지수 연산을 필요로 하는 Diffie-Hellman 키 교환 방식, 디지털 서명 알고리즘 및 EIGamal 암호화 방식과 같은 알고리즘을 위한 기본 구조로 사용할 수 있다. 이러한 알고리즘을 응용해서 타원 곡선(elliptic curve)에 기초한 암호화 시스템(Cryptosystem)의 구현에 사용될 수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.1
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• pp.646-651
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• 2015

In this paper, we analyze the architecture of a typical building automation systems and control points in the network architecture, interoperability, and performance aspects. We proposed a new virtualization-based point-to-point automatic control system that is connected to a high speed wired system. Cloud computing based automation system enables the user based environment control, and may perform a building energy management performance through the improvement of the building automation system efficiently In addition, the virtualization system makes it possible to perform the management of the group building load management operators efficiently.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.925-928
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• 2013

In this paper, we propose a relay-based wireless power transmission scheme in order to solve the problems of an existing wired power transmission for energy harvesting system. The proposed scheme can be transferred electromagnetic induction-based wireless power transmission by placing a 4-way coils in the energy block. We confirm the reliability of the electricity transmission through the relay control algorithm. Consequently, the proposed scheme can extend the transmit receive paths of transmission power.

• Information and Communications Magazine
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• v.22 no.5
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• pp.130-140
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• 2005

3G 이동통신 시스템 표준화 단체인 3GPP ($3^{rd}$ Generation Partnership Project)와 3GPP2 ($3^{rd}$ Generation Partnership Project 2)는 이동통신망에서의 무선 IP 멀티미디어 서비스 확산을 위하여 유선 인터넷의 핵심 응용 서비스인 실시간 서비스를 도입하기 위한 표준화 작업을 진행하고 있다. 그리고, 현재 개발 중인 HSDPA (High Speed Downlink Packet Access)와 IMS (IP Multimedia CN Subsystem)는 궁극적으로 All IP 기반 광대역 멀티미디어 서비스 제공을 추구하고 있으며 Parlay API(Application Programming Interface)를 이용한 다양한 $3^{rd}$ party 응용서비스 제공 환경을 제공할 수 있을 것이다. 이에 본 고에서는 HSDPA 및 IMS를 포괄하는 All IP관련 표준화 현황을 조사하고 나아가 IMS와 HSDPA 기반 서비스 진화에 대한 고찰을 통해 향후 이동통신 서비스의 개발 방향을 예측해 보고자한다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.691-693
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• 1999

이동 컴퓨팅 환경은 유선망에 비하여 대역폭이 낮고, 호스트의 성능이 낮으며, 사용자의 이동에 따른 여러 가지 문제점이 나타난다. 이러한 이동 컴퓨팅 환경에서 멀티미디어 서비스를 제공하기 위해서는 무엇보다 QoS 제어가 중요하다. 따라서 본 논문에서는 이동 멀티미디어 컴퓨팅 환경의 동적 변화에 적응하고, 효율적으로 QoS를 제어하기 위하여 동적 우선순위를 기반으로 한 QoS 제어 기법을 제시한다. 동적 우선순위는 최초 연결성정 시에 결정되는 정적 우선순위와 보상을 기반으로 한 대역폭 변화값에 따라 결정되며, QoS 제어를 위한 기준으로 사용된다. 이러한 동적 우선순위는 낮은 QoS를 제공받은 MH(Mobile Host)가 핸드오프를 수행하여 새로운 셀로 이동한 경우에도 지속적으로 낮은 QoS를 제공받는 문제를 해결함으로써 공평하게 대역폭을 할당하는 장점이 있다.