• Journal of the Korean Society for Railway
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• v.16 no.6
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• pp.510-518
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• 2013

These days, interest in radio networks for railways has increased both at home and abroad. In response to this trend, not only the existing radio networks which focus on railway control signals but also the next-generation integrated radio network that can send videos and manage mass storage data are actively being investigated. This paper proposes wireless communication methods to establish integrated radio networks for railways. The paper further suggests a candidate frequency band that could be allocated as the frequency band for railways among the frequency bands currently used in Korea. Based on this paper, we can expect that the domestic railroad will operate more efficiently and that security and convenience of the railroad will reach a superior level. In addition, the Korean integrated radio networks for railways, which cope with the changes in the global technology market, will be established.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.7
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• pp.1238-1244
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• 2001

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. In these networks the optical hardware in the RN is very simple, but a multiple access protocol is needed for upstream traffic control. On the other hand, the role of communications is already well established in the office environment. With the advent of cheap, affordable broadband communications and the increasing complexity of consumer electronics, it seems natural to extend the network into the home. As the application of Home Area Network is ever increasing, we therefore consider connectivity between access network and home network which generates various traffic to design MAC protocol over residential network. Global-FIFO is quite simple and allows dynamic upstream bandwidth assignment on the basis of a request-and-permit mechanism. It has good bandwidth efficiency and being cell-based, it does not consider the various traffic from home network. In this paper, we design and analyze the new MAC resource assignment algorithm called MQ-FIFO (Multiple Queue-FIFO) that provides good performance under the environment of ATM-PON and Home Network.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.6
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• pp.1091-1098
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• 2009

In this paper, we designed the authentication system for home network service and applied it to actual sensor nodes. The pair-wise pre-distribution key skim is applied for prevention of authentication key from sniffing on the wireless sensor networks. The authentication key and data are encrypted by using the CBC mode RC5 algorithm based on the SPINS. The experimental environment consists of a base station (BS)and sensor nodes and each sensor node sends both sensing data and the encrypted authentication key to the BS. For simulations we set up some what-if scenarios of security menaces in home network service.Slightly modified the TOS_Msg data arrays of TinyOS is suggested to store 8-byte authentication key which can enable data encryption and authentication at the each sensor node. As a result, malfunction caused by communication between BS and nodes of other groups of added nodes having malicious purpose can be protected. Also, we confirmed that a critical data of home networking service like vital signal can be transmitted securely through this system by encryption technique.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.671-673
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• 1998

전력 및 전화 서비스와 같은 저속의 댁내 망 구축에서 서비스 품질을 보장하는 다양한 대역폭의 멀티미디어 및 멀티포인트 서비스를 효율적으로 제공할 수 있는 댁내 망 구축 및 동영상 압축 기술 및 디지털 신호처리 기술의 발전으로 인해 댁내의 디지털 가전 기기들이 고속의 통신 기능이 탑재되는 정보 가전으로 발전하고 있다. 본 논문에서는 현재 활발히 다양한 댁배 망 서비스를 제공하고 잇는 RBB서비스 제공자들의 현황을 알아보고, 액세스 망을 통한 서비스와 댁내에서의 통신 서비스를 제공하기 위해서 댁내 망이 갖추어야할 조건을 분석한다. 또한, 앞으로 댁내 망 일반 사용자들이 이용하게 될 댁내외 서비스를 만족시키기 위한 서비스 요구사항에 대하여 기술한다.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.253-256
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• 2005

In this paper, we explain a various fiber to the home technology and give some important standardization status. And, passive optical networks which are WDM-PON, Ethernet PON and/or Gigabit-PON will be mainly deployed in populated subscriber area and multiple dwelling units with taking great advantage of OPEX. And finally we discuss FTTH deployment strategy with low capital cost.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.3 no.1
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• pp.126-133
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• 2004

최근 홈 내에서는 PC나 가전기기의 수가 증가하며, 네트워크 활용이 커짐에 따라 홈네트워크 기술이 중요한 이슈로 떠오르고 있다. 이러한 홈네트워크 기술은 PC나 가전기기 사이에 통신이 가능하도록 하는 기술을 말한다. 본 논문에서는 홈네트워크와 관련된 여러 가지 홈네트워크 기술을 살펴보도록 한다. 또한 지능형 홈네트워크 기술과 함께 센서네트워크를 활용한 앞으로의 지능형 홈네트워크 기술에 대해서도 알아보도록 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.1641-1646
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• 2006

This paper deals with a physical access network design problem arising from the deployment of fiber-to-the-home passive optical networks (FTTH-PON). The problem seeks to find an optimal location and capacity assignment of splitters in the network such that the total cost of fiber and splitter is minimized, while satisfying all the demand. We propose tabu search approach for finding a good feasible solution.

• Proceedings of KOSOMES biannual meeting
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• 1999.03a
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• pp.93-105
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• 1999

In Vessel Traffic Service, the management information on marine traffic control is almost transported by VHF. It is so difficult to exchange a lot of the related information necessary for marine traffic control exactly and in real time. Aiming at improved visualized data transporting network, we examine the methods for transporting and displaying the data on marine traffic controls. In this paper, we design the information networks established by broadcasting method and by internet method using home page in order to manage marine traffics in Masan port.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.811-813
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• 2001

본 논문에서는 기존의 IP 망에서 호스트의 이동성을 지원하기 위한 Mobile IP 개념을 ATM 망에 적용할 경우, Mobile IP망에서 Home Agent와 Foreign Agent 사이에 존재하는 Mobile-IP 터널링 구간을 기존의 LAN 기반의 IP 터널링 구간과 ATM 망에서의 단거리 터널링(short-cut tunneling) 구간으로 구분하여 관리하는 방안을 제안하였다. Short-cut 터널링을 설정하기 위하여 NHRP를 이용하였으며 Shot-cut 터널링을 이용함으로써 HA 와 FA 사이에 데이터 전달 지연을 기존의 IP 터널링에서의 데이터 전달 지연보다 줄일 수 있음을 시뮬레이션을 통해 확인하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.106-108
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• 2002

기존의 단말에서는 외부노드와 최초의 통신 시에 자신이 속해있는 HA(home Agent) 하나만을 거쳐간다. 그러나 이동망에서는 MR(Mobile Router) network의 하단에 다른 HA에 속해있는 이동 서브넷이 방문했을 때의 시나리오가 추가로 고려되어야 한다. 그런데 CN(Correspondance Node)과 방문한 네트워크의 노드와의 통신에서 전송된 패킷이 인터넷으로 연결하는 가장 상단의 이동망으로부터 자신이 속해있는 망까지 경로 상에 위치한 각각의 해당 HA를 모두 방문하여 우회하는 경로가 이루어지는 문제점이 있다. 따라서 본 논문에서는 이 문제의 해결을 위해 라우팅을 효율적으로 지원할 수 있는 MTA(Mobile Transmission Agent)를 제안한다.