• KSII Transactions on Internet and Information Systems (TIIS)
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• v.5 no.11
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• pp.1997-2015
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• 2011

In this paper, we propose the enhanced network-based mobility management protocol, called enhanced proxy mobile ipv6 (E-PMIPv6), which can provide mobile nodes (MNs) with a fast and efficient mobility service in PMIPv6 domain. The proposed scheme can provide a fast and efficient mobility service to MNs and also the strength of network scalability and stability to an access network by proposing the dynamic virtual hierarchical network architecture. In addition, the pre-authentication procedure for an MN, based on the information of neighbor mobile access gateway (MAG) list in the enhanced-policy server (E-PS), is proposed to support seamless handover by reducing MN's handover latency. Through performance evaluations of numerical analyses and simulations, we have confirmed and verified the superiority of the proposed scheme compared to the conventional proxy mobile ipv6 (PMIPv6).

• Journal of Physiology & Pathology in Korean Medicine
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• v.30 no.6
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• pp.419-425
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• 2016

This study analyzed research methodologies based on network pharmacology to build a new system architecture optimized for Korean Medicine research. Results form studies using network pharmacology were collected and analyzed to evaluate the strength and weakness. Finally, an improved system architecture was proposed. Whether the predicted effects of drugs or herbs from network pharmacological analyses were in agreement with those from conventioanl knowledge of Korean Medicine was evaluated. These results were used to verify the applicability of research methodologies to the modern pharmacology and Korean Medicine respectively. Eighteen papers using TCMSP were collected and analyzed. The results suggest that the research methodology based on network pharmacology is appropriate only for the modern pharmacology but not for Korean Medicine. Information about compound-compound, herb-herb and drug-compound interactions need to be considered. We propose the modified system architecture with those information.

• Journal of Korean Society on Water Environment
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• v.29 no.1
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• pp.55-65
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• 2013

It is very difficult to apply stream flow data directly to the management of Total Maximum Daily Loads because there are some differences between the unit watershed and the stream flow monitoring network in their characteristics such as monitoring locations and its intervals. Flow duration curve can be developed by linking the daily flow data of stream monitoring network to 8 day interval flow data of the unit watershed. This study investigated the current operating conditions of the stream flow monitoring network and the flow relationships between the unit watershed and the stream flow monitoring network. Criteria such as missing and zero value data, and correlation coefficients were applied to select the stream flow reference sites. The reference sites were selected in 112 areas out of 142 unit watersheds in 4 river basins, where the stream flow observations were carried out in relatively normal operating conditions. These reference sites could be utilized in various ways such as flow variation analysis, flow duration curve development and so on for the management of Total Maximum Daily Loads.

• Journal of Digital Contents Society
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• v.18 no.5
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• pp.983-987
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• 2017

Multi-homing mobile router separates network for user connection and network for internet access using various interfaces for internet access. This paper proposes a load balancing metric in order that multi-network mobile router distributes its traffic to one of several heterogeneous network interfaces. To evaluate the performance of the load balancing metric, experiments on traffic balancing is performed on real commercial networks were used in Korea and Hong Kong.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.4 no.1
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• pp.37-44
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• 2005

본 논문에서는 멀티 코드 CDMA(Code Division Multiple Access)시스템에서 고속의 멀티미디어 서비스를 지원하기 위해 정보 데이터열을 QAM(Quadrature Amplitude Modulation) 부호화하는 방법을 제안한다. 송신 구조는 입력 비트를 정진폭 다중부호 이진직교 변조(Constant amplitude code biorthogonal modulation: 이하 CACB라 칭함)로 부호화하여 전송 심볼의 크기를 일정하게 하고 이렇게 이진화된 신호를 QAM 부호화하여 전송속도를 높인다. 복조기의 구조는 수신된 신호로부터 QAM 연판정기 블록을 거쳐 생성된 신호를 CACB 복호화기를 거쳐 데이터를 복조해 낸다. 제안된 시스템은 기존의 멀티 코드 방식에 비해 대역폭 효율을 크게 개선시킬 수 있어 전송 속도를 많이 향상시킬 수 있고, 멀티 코드 방식을 기반으로 하기 때문에 디지털 가전기기나 3세대 이동통신과, WPAN과 관련된 무선 네트워크 응용과 같은 미래의 고속의 무선 멀티미디어 서비스를 지원하기에 적합하다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.195-196
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• 2009

서비스 로봇의 활용에 있어, 보다 고품질의 다양한 서비스를 제공하기 위해 로봇이 사용자의 위치를 추적하고 필요에 따라 사용자 주위로 이동할 수 있는 추종 기능이 요구된다. 현실적으로 사용자 위치 추종 기능을 독립적인 단일 로봇만으로 구현하기는 어려우며 다수 로봇과 환경 내에 설치된 장치들을 복합적으로 활용하여 구현하는 것이 효과적이다. 한국전자통신연구원에서는 네트워크 기반으로 다수의 이종 로봇과 환경 내 장치간의 협업에 대한 연구를 진행해 왔으며, 이러한 연구의 일환으로 이종 다수 로봇 협업 기반 사용자 추종 및 사용자 위치 기반 로봇 서비스 시스템을 개발하였다. 본 논문에서는 기 개발된 사용자 위치 추적 시스템을 실제 로봇에 적용하여 사용자를 추종하고, 이를 바탕으로 로봇이 사용자에게 다양한 서비스를 제공하는 로봇 응용 시스템에 대해 설명한다.

• Journal of Information Science Theory and Practice
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• v.10 no.spc
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• pp.12-24
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• 2022

This study attempted to investigate changes in collaboration structure for each stage of national Research and Development (R&D) in the artificial intelligence (AI) field through analysis of a co-author network for papers written under national R&D projects. For this, author information was extracted from national R&D outcomes in AI from 2014 to 2019. For such R&D outcomes, NTIS (National Science & Technology Information Service) information from the KISTI (Korea Institute of Science and Technology Information) was utilized. In research collaboration in AI, power function structure, in which research efforts are led by some influential researchers, is found. In other words, less than 30 percent is linked to the largest cluster, and a segmented network pattern in which small groups are primarily developed is observed. This means a large research group with high connectivity and a small group are connected with each other, and a sporadic link is found. However, the largest cluster grew larger and denser over time, which means that as research became more intensified, new researchers joined a mainstream network, expanding a scope of collaboration. Such research intensification has expanded the scale of a collaborative researcher group and increased the number of large studies. Instead of maintaining conventional collaborative relationships, in addition, the number of new researchers has risen, forming new relationships over time.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.2031-2032
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• 2006

고압 배전선로를 전력선통신망으로 활용하기 위하여는 고압 배전선로에 대한 입력 임피던스에 대한 정확한 이론적 고찰과 실선로에서의 측정을 통한 검증이 요구된다. 본 논문에서는 고압 배전선로용 신호결합장치의 등가회로를 바탕으로 고압 전력선통신시스템의 입출력 모뎀을 제안한다. 제안된 시스템입출력 모델을 바탕으로 고압 배전선로의 고주파(2-30MHz) 대역의 입력 임피던스를 계산한다. 고압 배전선로 통신 입출력 모델에서 지면의 유전상수, 전력선의 길이, 지면의 도전율에 따른 배전선로 입력 임피던스의 이론적 분석과 실 선로에서의 입력 임피던스 측정 결과를 소개한다.

• International Journal of Contents
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• v.11 no.1
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• pp.52-61
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• 2015

In the past decade, East Asian Research has received attention from researchers as well as in South Korea society-at-large. The broad category of East Asian Research includes various disciplinary fields, such as "history, economics, and politics; however, few studies have used quantitative analysis to explore its development. In this paper, we used network analysis to identify the disciplines and active research areas, focusing on productivity, collaboration patterns, and citation networks of East Asian Research in South Korea. For this study, 6,646 journal publications related with East Asian Research and indexed by KCI (Korean Citation Index) during the 10-year period of 2004-2013 were considered. Results show that East Asian Research was led during this period by sole-researchers, rather than interdisciplinary studies. Moreover, a co-institution network represents active institutions with a high degree and collaborative centrality. In terms of journal-journal citation networks, journals belonging to both "history" and "Korean literature" disciplines were dominant.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.3043-3045
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• 2005

기업체나 연구소와 같은 전자기자재의 사용이 많은 곳에서 효율적인 기자재 관리는 필수적이다. 이에 따라 모든 기자재를 관리하는 데이터베이스의 필요성이 대두된다. 본 논문은 데이터베이스를 카운터가 내장된 기자재로부터 추가적인 망의 포설 없이 기존의 전력선을 이용하여 음성통신과 초고속 통신이 가능한 전력선 통신(PLC:Power Line Communications)[1]를 통해 데이터베이스를 수집하고 수집된 데이터베이스를 무선으로 모니터링 할 수 있는 시스템을 구현하는데 그 목적이 있다. 이 시스템의 구현을 위해 ARM9 core를 기반으로 한 임베디드 리눅스 시스템에 웹서버, 무선프로토콜 등을 포팅하여 무선네트워크가 가능한 PDA, 노트북 등을 이용하여 손쉽게 모니터링 할 수 있는 시스템을 구현하고자 했다.