• Journal of the Korean Institute of Gas
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• v.25 no.5
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• pp.78-87
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• 2021

This paper analyzes the range and attributes of the traffic information service between domestic public institutions and private companies, and suggests the possibility of joint application of node-link information for each company and the possibility of joint use of private traffic information. For this purpose, the present condition and attributes of domestic and foreign traffic information node-links (link length, node ID number, U-turn information, lane information, left turn information, right turn information, etc.) were analyzed. The analysis targets, the node-link of the national standard node and the two companies were analyzed. The area of the experiment was selected in Jongno-gu, Seoul, where standard-link information is complex, traffic volume is high, and various standard-links exist. The experiment was conducted by comparing and analyzing the traffic information attributes of three types of node-links and performing node-links overlapping matching (utilizing encoding_decoding method), and the possibility of matching node-links and attributes of different specifications was analyzed using Open LR technique.

• Review of KIISC
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• v.16 no.1
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• pp.99-111
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• 2006

바인딩 갱신 프로토콜은 이동노드가 흠 링크가 아닌 외부 링크로 이동했을 경우 기존 통신노드와 지속적인 연결을 유지하고 경로를 최적화하기 위한 목적으로 설계된 프로토콜이다. IETF의 모바일 IPv6 표준문서에는 RR(Return Routability) 기법을 이용해서 바인딩 갱신을 수행하도록 권장하고 있다 하지만 RR 기법이 모바일 IPv6 보안 요구사항들을 전적으로 보장하지 않는다. 이 문제점을 해결하기 위해 IETF에서는 RR 기법에 IPsec을 이용하여 바인딩 갱신을 수행할 것을 권장하고 있다. 그러나 단기간의 연결 세션을 갖거나 저전력의 모바일 장치에 IPsec을 사용하는 것은 효율성이 떨어질 수 있다. 이 논문에서는 표준으로 제안된 RR 기법을 비롯하여. RR의 문제점을 해결하고자 제안된 여러 프로토콜을 살펴보고. 각 프로토콜의 안전성과 효율성을 분석한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.665-667
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• 2011

최근에 에너지 효율적이며 신뢰성 있는 데이터 전송을 보장하기 위한 많은 라우팅 기법의 연구가 진행되고 있다. 하지만 현재까지 무선센서네트워크에서의 표준 라우팅 기법이 없는 상황에서 신뢰성을 제공하기 위한 새로운 라우팅 기법을 제안하는 것은 실용적이지 않으며 비효율적이다. 본 논문에서는 신뢰성 있는 데이터 전송을 범용적으로 보장하기 위해서 기존의 라우팅 기법의 신뢰성 및 확장성을 제공하는 모듈기법인 DRDT(Delay-based Reliable Data Transmission)를 향상시킨 ADRDT(Advenced Delay-based Reliable Data Transmission) 기법을 제안한다. ADRDT는 수신노드가 불안정한 링크상태로 인해 데이터 수신을 실패하는 경우 데이터를 오버히어링한 헬퍼노드(helper node)의 협력적인 재전송을 통해 신뢰성을 제공한다. 헬퍼노드는 수신노드의 이웃노드가 데이터를 오버히어링할 때 딜레이를 이용한 분산적 방법을 통해 동적으로 선정되며, 수신노드와의 링크상태를 고려하기 때문에 효과적으로 재전송 횟수를 감소시킨다. 제안 기법은 기존 기법과 비교해 전송 비용을 약 16.5% 감소시킨다.

• Transportation Technology and Policy
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• v.2 no.4
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• pp.60-70
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• 2005

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.960-967
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• 2012

Wireless sensor network is used at the environment to obtain nearby information and since such information is transferred through wireless link, it causes unnecessary re-sending and disadvantage of big energy consumption at node. Because of this to select reliable, energy effective link, method of estimating quality on wireless link using RSSI(received signal strength indication), LQI(link quality indication), etc is needed on wireless link. To set up path extending survival time by reducing energy consumption of nodes at the wireless sensor network, the thesis selects with small standard deviation of LQI after obtaining LQI within each path. Additionally, LQI standard deviation routing algorithm is compared based on LQI algorithm such as minimum-LQI, hop-LQI weight and RF output -7dBm. According to the outcome, the algorithm suggested has superior characters such as the number of node, retransmission rate and network life span respectively compared to existing algorithm. Therefore, energy consumption can be efficiently reduced in case that LQI standard deviation routing scheme suggested by this paper is adapted to wireless sensor network.

• 한국ITS학회:학술대회논문집
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• 2005.11a
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• pp.89-96
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• 2005

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.6
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• pp.299-310
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• 2022

The ability of an automated driving system is based on vehicle sensors, judgment and control algorithms, etc. The safety of automated driving system is highly related to the operational status of the road network and compliant road infrastructure. The safe operation of automated driving necessitates continuous monitoring to determine if the road and traffic conditions are suitable and safe. This paper presents a node and link system to build a road monitoring system by considering the ODD(Operational Design Domain) characteristics. Considering scalability, the design is based on the existing ITS standard node-link system, and a method for expressing the monitoring target as a node and a link is presented. We further present a technique to classify and manage hazard risk into five levels, and a method to utilize node and link information when searching for and controlling the optimal route. Furthermore, we introduce an example of system implementation based on the proposed node and link system for Sejong City.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.3A
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• pp.141-150
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• 2012

The WiMedia Alliance has specified a Distributed Medium Access Control (D-MAC) protocol based on UWB for high speed wireless home networks and WPANs. In this paper, firstly, a time slot reservation protocol for relay transmission is proposed. Furthermore, we propose a novel relay node selection algorithm adaptive to current UWB link transmission rate. The proposed relay node selection algorithm has compatibility with current WiMedia D-MAC standard and is executed at each device according to the SoQ as a QoS criterion.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.217-219
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• 2012

효율적으로 일하는 방법을 제시하는 프로젝트 관리 프레임 중의 하나인 PMBOK는 9가지 프로젝트 관리 영역의 필요성을 제시하고 있다. PMBOK 프로세스 연관도를 살펴보면, 네트워크 토폴로지의 특징인 노드, 링크, 순위, 빈도수와 관련된 유사한 면이 있는 것을 발견할 수 있다. PMBOK의 표준 프로세스 연관도에 따라 연결되는 링크를 순차적으로 그린다고 가정했을 때, 실제 업무의 프로세스 링크는 네트워크이론의 Power-law를 따를 것이라고 예상되었다. 이러한 현상을 증명하기 위해 PMBOK 표준 프로세스 연관도를 모델로 하여, 인터넷 위상의 특징을 결정하는 속성 중 Power-law1, 2의 관련성을 분석하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.758-760
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• 2012

The wireless sensor network is used to get information that location tracing or data of surrounding areas. Unnecessary retransmission request or many energy consumption because the transmission over the wireless links. In order to select the link of reliable and energy efficient to estimate the quality of radio link technique is required using RSSI, LQI, and so on. In this paper, each path between the sensor nodes, a small in the path within standard deviation of shall be determined the priority. Each path a high priority of the node values, respectively LQI is accumulated. Node can be selected the high LQI value path. Among them the less hop count to select the path is proposed. The proposed algorithm is removed the paths of shorten life using high the LQI value of the entire and high hop count even less variation. So its advantage that the sensor nodes can be selected more reliable path.