• Electronics and Telecommunications Trends
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• v.11 no.4 s.42
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• pp.63-75
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• 1996

본 고에서는 일반 가정 및 소규모 업무용 가입자들에 대한 광대역화의 가장 경제적인 대안으로 관심을 끌고 있는 Hybrid fiber-coax 구조의 CATV 전송망에 대한 표준화 동향에 대해 조사 분석한 내용을 기술한다. HFC 액세스망에 대한 표준화는 IEEE 802.14 그룹, DAVIC, ATM Forum, IETF(Internet Engineering Task Force)와 Cable TV업계 등 여러기구에서 추진하고 있다. 지금까지 물리계층, MAC계층 등에 대한 주요 표준규격에 대해 DAVIC과 IEEE 802.14에서 주도하고 있으나, 앞으로는 데이터 서비스에 상대적 우선 순위를 두고 표준화를 추진하는 IEEE 802.14그룹에서 주도하게 될 것으로 보인다. 또한 인터넷 접속과 고속 데이터 서비스를 위한 인터페이스와 IP 접속 프로토콜에 대한 표준화를 발 빠르게 추진하고 있는 IETF와 MCNS(Multimedia Cable Network System) 등의 역할이 커질 것으로 전망된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.664-668
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• 2004

본 논문에서는 고속 이더넷의 고속의 이더넷의 물리계층에서 수신된 비트열로 부터 클록을 복원하고, 이 클록으로부터 동기된 비트열을 10b/8b 디코딩한 다음, 바이트열로 복원하여 데이터 링크계층의 MAC(Media Access controller)로 전송한다. PCS의 디코더는 S비트의 데이터와 제어신호를 추출하여 MAC으로 전달하는 기능을 수행한다. 즉 본 논문에서는 PCS기능 중 가장 중요한 요소인 10b/8b 디코더를 VHDL언어를 사용하여 기술하고 Xilinx ISE5.1를 이용하여 구현하였고, 입력 부분에 DDR인터페이스를 사용하였다. 구현한 결과 1056개의 게이트 사용하였으며, 10Gbps를 지원하기 위해서는 한 블록 당 2.5Gbps의 처리속도가 필요하다. 설계 모듈은 5.1Gbps의 처리 속도를 지원하여 관련 응용분야에서 사용이 가능할 것으로 사료된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.170-173
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• 2015

대규모 실험장비에서 발생하는 아주 큰 사이즈의 데이터를 처리하기 위해서 기존에는 수집 및 저장, 계산 장비로의 원거리 전송, 데이터 분석 등의 단계를 따로 처리해 왔다. 데이터의 양이 폭발적으로 증가하고 있고 동시에 데이터의 실시간 처리 요구가 증가하는 상황이다. 이에 본 연구에서는 추상화된 입출력 계층을 이용하여 마치 로컬 저장소에 있는 데이터를 사용하는 것과 같은 인터페이스를 통해 원거리에서 생성된 데이터 스트림을 실시간으로 이동하고 처리할 수 있는 기법을 소개한다. 또한 데이터 전처리 계산 위치를 송신 측으로 변경하여 대용량 데이터를 효과적으로 전송하기 기법을 제안한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.309-310
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• 2023

본 논문은 해상 항로 표지 내 탑재되는 다양한 해양 센서, 등명기, 전원 모듈을 분리하여 각각의 서브 플랫폼으로 관리하고 각각의 서브 플랫폼들은 통합적으로 운영하는 메인 플랫폼 구조를 갖는 계층적 형태의 스마트 항로표지 구조안을 제시한다. 제안된 구조안을 바탕으로 기존에 제공되는 다양한 장비 및 센서 뿐만 아니라 항로표지 신 서비스 요구사항에 따른 신규 센서의 확장 및 설치가 용이하며, 서브 플랫폼 별 독립적인 운영을 통한 전체 시스템의 안정성 향상 기대할 수 있다. 또한, 목적에 따른 숫자, 음성, 영상 등 다양한 형태의 데이터를 전송하기 위한 선택적 통신 플랫폼 구조를 제시함으로써 육상 정보협력시스템과의 원활한 정보 교환 체계를 구축할 수 있는 방안을 제안한다.

• The KIPS Transactions:PartC
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• v.14C no.2
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• pp.171-178
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• 2007

In mobile ad hoc networks, an application scenario requires mostly group mobility behavior in the mix of group moving nodes and individually moving nodes. The nodes of those applications tend to belong to the movement group with similar movement behavior. Group mobility is one of the good methods to improve scalability, and reduces the protocol overhead. In this paper, we propose the multicast architecture which regards nodes that have equal group mobility in the heterogeneous group mobility network as the single entity with the multiple interfaces and composes multicast tree, The logical cooperative entity-based multicast architecture accommodates the scalability, the multicast tree simplification, and the protocol overhead reduction which arc obtained from the hierarchical multicast architecture, while it maintains the nat multicast architecture for the data transmission. It also prevents the concentration of the energy consumption dispersing data forwarding load into the several ingress/egress nodes. Results obtained through simulations show that logical cooperative entity based multicast protocol with multiple interfaces offers the protocol scalability and the efficient data transmission.

• Convergence Security Journal
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• v.7 no.4
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• pp.1-8
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• 2007

Currently, the needs of open standard and integrated network, and also applications of Ethernet network based system are increasing. By applying and expanding TCP/IP based network technology from high to low control level, factory automation application has been implemented, and thus integrated factory automation system has been accomplished, which is directly interoperable between high level management program and DB system. This paper proposes a communication control device which is based on Ethernet/IP standard system for factory automation. The proposed system is workable in the environment of a network system, which is based on CIP standard interface technology. The proposed system can also contribute to improve data communication characteristics.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.11B
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• pp.1583-1594
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• 2001

In this paper, the transmission structure and procedure of a random access channel for the IMT-2000 satellite radio specification are presented. The proposed random access method has much commonality with that of the 3GPP FD specification which is a terrestrial radio interface of IMT-2000. The proposed method was designed by considering characteristics of satellite link as we71 as the commonality with the terrestrial component. A preamble consists of sub-preamble repetition and a message is transmitted along with the preamble successively. The propose method has fast indication of preamble acquisition by physical layer. The proposed method has been included in the SAT-CDMA which is a radio transmission technology Proposed by TTA, KOREA and approved as a satellite radio interface at ITU-R. Additionally, in this Paper the signaling delay for the proposed random access channel will be analyzed and it will be compared to that of the random access methods using a conventional ALOHA procedure and the 3GPP procedure in aspect of the signaling delay. When the SAT-CDMA satellite constellation at the height of about 1600 km is considered, the delay of the proposed method was estimated to 100 ms less than that of the conventional ALOHA. This delay difference increases with 7he number of retransmissions. The delay is reduced by 30 ms, compared with the 3GPP method.

• The Journal of the Korea Contents Association
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• v.10 no.12
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• pp.10-17
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• 2010

In this paper, we design digital D-PHY link chip controling DSI (Display Serial Interface) that meets MIPI (Mobile Industry Processor Interface) standard. The D-PHY supports a high-speed (HS) mode for fast data traffic and a low-power (LP) mode for control transactions. For low power consumption, the unit blocks in digital D-PHY are optionally switched using the clock gating technique. The proposed low power digital D-PHY is simulated and compared with conven tional one about power consumption on each transaction mode. As a result, power consumptions of TX, RX, and total in HS mode decrease 74%, 31%, and 50%, respectively. In LP mode, power reduction rates of TX, RX, and total are 79%, 40%, and 51.5%, separately. We implemented the low power MIPI D-PHY digital chip using $0.13-{\mu}m$ CMOS process under 1.2V supply.

• Journal of the Korea Society of Computer and Information
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• v.18 no.10
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• pp.47-54
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• 2013

In this paper, the structural design of optical Internet is analyzed and by using UNI (User Network Interface) signaling protocol an optical transmission experiment was performed. The hierarchical structure of the basic optical Internet consists of the backbone network, the service network and the access network. The necessary functions for each layer were described as follows: Control structure of the optical transport layer, network operation and management structure, internetworking technology of sub networks, routing and signaling technology. By using UNI signaling protocol from OIF (Optical Internetworking Forum), the optical transmission in the proposed structure of the optical Internet network was experimented. By the traffic generation of LSP (Label Switched Path) data packets along the route-configuration was delivered to UNI. Finally, by showing the value of TCP (Transmission Control Protocol) packets the optical transmission was completely and successfully demonstrated.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.6
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• pp.26-36
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• 2009

ad-hoc network is self-constructed by mobile hosts without any infrastructure. And the hosts collaborate with each other for routing packet by means of multi-hop communication. But it is too hard to deploy ad hoc network at the large area because of the salability problem caused by low network throughput. network throughput decrease is due to contention on the air among the neighbor host and single interface limitation, and broadcast flooding through overall network. In this paper, to solve the ad hoc scalability problem, we propose mesh network based scalable hierarchical ad hoc architecture, and also propose the adaptation methods for inter-working with the host not including ad hoc functions and the legacy infra-network.