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Physical-Layer Network Coding Based Throughput-Optimal Transmission for Bidirectional Traffic
Noh, Wonjong,Lim, Sung Hoon,Kim, Tae-Suk IEEE 2018 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.67 No.4
<P>In this study, we develop a physical-layer network coding based throughput-optimal transmission scheduling policy, which we call network coding aware maximum differential backlog (NCMDB), and demonstrate its throughput optimality. As the proposed policy requires an NP-hard network-wide centralized algorithm to determine the optimal transmission schedule, we propose a distributed NCMDB based on link prioritization (D-NCMDB) as a lower bound approach. We further propose a bidirectionality-aware route establishment scheme for the best application of the NCMDB and D-NCMDB policies. Simulations confirm that compared to the signal-to-interference-based interference avoidance transmission approach and random maximal physical-layer network coding approach, the proposed D-NCMDB scheme offers <TEX>$48\%$</TEX> and <TEX>$27\%$</TEX> increased throughput, <TEX>$78\%$</TEX> and <TEX>$63\%$</TEX> reduced access delay, and <TEX>$80\%$</TEX> and <TEX>$20\%$</TEX> enlarged stability, respectively. The proposed distributed transmission scheduling scheme can be employed in future communication networks in which both the number of nodes and the amount of interference increase exponentially.</P>
상황인지 기반 IoT-MEC 서비스를 위한 계층적 서비스 바인딩 및 자원관리 구조 설계
노원종(Wonjong Noh) 한국전기전자학회 2021 전기전자학회논문지 Vol.25 No.4
본 논문에서는 mobile edge computing (MEC) 네트워크에서 컨텍스트 기반 IoT 서비스를 위한 새로운 서비스 바인딩 및 리소스 관리 모델을 제시한다. 제안하는 제어는 MEC 서비스 바인딩 제어 계층 (MCL)과 사용자 컨텍스트 제어 계층 (UCL)의 두 가지 계층으로 구성되며, MCL은 시스템 관점에서 서비스 바인딩 구성, 리소스 할당 및 서비스 정책 구성을 관리하고, UCL은 사용자 관점에서 메타 객체를 사용하여 실시간 서비스 적응을 관리한다. 본 논문에서 제안하는 제어 모델은, 실험을 통해 기존 컴퓨팅 모델과 비교할 때 향상된 정보 처리량과 콘텐츠 전송 시간을 제공함을 확인했다. 제안하는 제어 모델은 차세데 MEC 환경에서 컨텍스트 기반의 다양한 사물인터넷 서비스의 핵심 구성 요소로 적용될 수 있다. In this paper, we presents a new service binding and resource management model for context based services in mobile edge computing (MEC) networks. The proposed control is composed of two layers: MEC service binding control layer (MCL) and user context control layer (UCL). The MCL manages service binding construction, resource allocation, and service policy construction from a system point of view; and the UCL manages real-time service adaptation using meta-objects. Through simulations, we confirmed that the proposed control offers enhanced throughput and content transfer time when it is compared to the legacy computing and control models. The proposed control model can be employed as a key component for the context based various internet-of-things (IoT) services in MEC environments.
Kim, Yusung,Noh, Seungtak,Cho, Gu Young,Park, Taehyun,Lee, Yoon Ho,Yu, Wonjong,Lee, Yeageun,Tanveer, Waqas Hassan,Cha, Suk Won Korean Society for Precision Engineering 2016 International Journal of Precision Engineering and Vol.17 No.8
Thin film solid oxide fuel cells with nickel oxide - gadolinia doped ceria anodes deposited by sputtering were operated at <TEX>$500^{\circ}C$</TEX>. The fuel cells each have 750 nm - yttria-stabilized zirconia electrolytes and 200 nm - platinum cathodes. The thicknesses of the anodes are 240 nm, 320 nm, and 400 nm. The cell with the 320-nm-thick anode showed the highest maximum power density among all cells. Through electrochemical impedance spectroscopy, the anodic activation resistance and the ohmic resistance were calculated. The anodic activation loss decreased with an increase in the anode thickness. Therefore, the cell with the 400-nm-thick anode showed the lowest activation polarization resistance. Additionally, the ohmic resistance, the sum of various electronic/ionic resistances, was lowest when using the 320-nm-thick anode. The electronic resistance and the ionic resistance of the anode were found to exist in a trade-off relationship owing to the current-collecting method of the anode.
정다운(Dawoon Chung),노원종(Wonjong Noh),한규호(Kyuho Han),임경수(KyungSoo Lim),안순신(Sunshin Ahn) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
배터리 파워는 모바일 애드 혹 네트워크(Mobile Ad hoc Network)에서 중요한 리소스이다. 기존의 라우팅 알고리즘에서는 노드의 파워를 on-off 시키는 방법으로 파워를 관리해왔다. 본 논문에서는 DSR (dynamic source routing)에서 route discovery, route maintenance를 할 때 각 노드의 배터리 파워 레벨을 고려하여 파워 레벨이 낮은 노드들은 RREP packet을 보내지 않음으로써 소스에서 데스티네이션까지의 경로를 오래 유지시킬 수 있고, 또한 파워 레벨이 높은 하나의 노드에 트래픽이 집중되지 않도록 하기 위해 큐(queue)에 담겨있는 트랜스미션 패킷과 리시브 패킷의 수까지 고려하여 경로를 설정한다. 이 알고리즘을 이용함으로써 각 노드의 파워를 효율적으로 관리함은 물론, 전체 네트워크의 load 균형을 맞춤으로 네트워크의 수명을 길게 할 수 있다.
PP-LET를 이용한 플라스틱 도어 모듈 플레이트 개발
최민호(Minho Choi),노원종(Wonjong Noh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
최근, 자동차 산업은 유리강화 장섬유 폴리프로필렌(PP-LET)을 이용한 경량화 연구, 개발이 활발히 진행 중이다. 본 논문은 PP-LFT의 특성을 검토하고, 이를 이용한 플라스틱 도어 모듈 플레이트 개발에 대하여 논하였다. 특히 자동차 도어 모듈의 개발 동향을 소개하고, PP-LFT 소재를 도어 모듈 플레이트로 개발하는 과정에 있어서 구조해석, 유동해석이 어떻게 이용되었는지에 대하여 기술하였다. 또한 양산 적용성을 검토하기 위하여 단품평가 및 Assembly평가에 대한 결과와 궁극적 목적인 경량화 및 주변부품 절감 효과에 대하여 논하였다.
Outage Analysis of User Pairing Algorithm for Full-Duplex Cellular Networks
Choi, Hyun-Ho,Noh, Wonjong WILEY INTERSCIENCE 2019 WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Vol.2019 No.-
<P>In a full-duplex (FD) cellular network, a base station transmits data to the downlink (DL) user and receives data from uplink (UL) users at the same time; thereby the interference from UL users to DL users occurs. One of the possible solutions to reduce this interuser interference in the FD cellular network is<I> user pairing</I>, which pairs a DL user with a UL user so that they use the same radio resource at the same time. In this paper, we consider a user pairing problem to minimize outage probability and formulate it as a nonconvex optimization problem. As a solution, we design a low-complexity user pairing algorithm, which first controls the UL transmit power to minimize the interuser interference and then allows the DL user having a worse signal quality to choose first its UL user giving less interference to minimize the outage probability. Then, we perform theoretical outage analysis of the FD cellular network on the basis of stochastic geometry and analyze the performance of the user pairing algorithm. Results show that the proposed user pairing significantly decreases the interuser interference and thus improves the DL outage performance while satisfying the requirement of UL signal-to-interference-plus-noise ratio, compared to the conventional HD mode and a random pairing. We also reveal that there is a fundamental tradeoff between the DL outage and UL outage according to the user pairing strategy (e.g., throughput maximization or outage minimization) in the FD cellular network.</P>
Hybrid Neural Coded Modulation: Design and Training Methods
Sung Hoon Lim,Jiyong Han,Wonjong Noh,Yujae Song,Sang-Woon Jeon 한국통신학회 2022 ICT Express Vol.8 No.1
We propose a hybrid coded modulation scheme which composes of inner and outer codes. The outer-code can be any standard binary linear code with efficient soft decoding capability (e.g. low-density parity-check (LDPC) codes). The inner code is designed using a deep neural network (DNN) which takes the channel coded bits and outputs modulated symbols. For training the DNN, we propose to use a loss function that is inspired by the generalized mutual information. The resulting constellations are shown to outperform the conventional quadrature amplitude modulation (QAM) based coding scheme for modulation order 16 and 64 with 5G standard LDPC codes.