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Understanding Processing Overheads of Network Coding-Based Content Distribution in VANETs
Uichin Lee,Seung-Hoon Lee,Kang-Won Lee,Gerla, Mario IEEE 2013 IEEE transactions on parallel and distributed syst Vol.24 No.11
<P>Content distribution in vehicular networks, such as multimedia file sharing and software updates, poses a great challenge due to network dynamics and high-speed mobility. In recent years, network coding has been shown to efficiently support distribution of content in such dynamic environments, thereby considerably enhancing the performance. However, the related work in the literature has mostly focused on theoretic or algorithmic aspects of network coding so far. In this paper, we provide an in-depth analysis on the implementation issues of network coding in wireless networks. In particular, we study the impact of resource constraints (namely CPU, disk, memory, and bandwidth) on the performance of network coding in the content distribution application. The contribution of this paper is twofold. First, we develop an abstract model of a general network coding process and evaluate the validity of the model via several experiments on real systems. This model enables us to find the key resource constraints that influence the network coding strategy and thus to efficiently configure network coding parameters in wireless networks. Second, we propose schemes that considerably improve the performance of network coding under resource constrained environments. We implement our overhead model in the QualNet network simulator and evaluate these schemes in a large-scale vehicular network. Our results show that the proposed schemes can significantly improve the network coding performance by reducing the coding overhead.</P>
Efficient Peer-to-Peer File Sharing Using Network Coding in MANET
Lee, Uichin,Park, Joon-Sang,Lee, Seung-Hoon,Ro, Won-W.,Pau, Giovanni,Gerla, Mario The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.4
Mobile peer-to-peer (P2P) systems have recently got in the limelight of the research community that is striving to build efficient and effective mobile content addressable networks. Along this line of research, we propose a new peer-to-peer file sharing protocol suited to mobile ad hoc networks (MANET). The main ingredients of our protocol are network coding and mobility assisted data propagation, i.e., single-hop communication. We argue that network coding in combination with single-hop communication allows P2P file sharing systems in MANET to operate in a more efficient manner and helps the systems to deal with typical MANET issues such as dynamic topology and intermittent connectivity as well as various other issues that have been disregarded in previous MANET P2P researches such as addressing, node/user density, non-cooperativeness, and unreliable channel. Via simulation, we show that our P2P protocol based on network coding and single-hop communication allows shorter file downloading delays compared to an existing MANET P2P protocol.
Toward energy-efficient content dissemination
Uichin Lee,Rimac, I,Kilper, D,Hilt, V IEEE 2011 IEEE network Vol.25 No.2
<P>A major role of today's Internet is to provide efficient content dissemination among users, such as distributing multimedia content and sharing user generated data. To meet the ever increasing demands, the Internet has been rapidly growing, and it now includes a web of tens of millions of networked devices ranging from content servers to core and edge routers to home gateways. Due to the sheer numbers, however, it is reported that these devices, such as those used for content delivery, consume a considerable amount of energy. While optimizing the energy efficiency of data centers is well studied in the literature, understanding the energy efficiency of various content dissemination strategies has received comparatively little attention thus far. In this article we review existing content dissemination architectures and survey the energy efficiency of various network devices used for content delivery. The energy efficiency comparison using simple trace-based simulations reveals that a change from a host-oriented to a content-centric networking model can substantially improve energy efficiency of content dissemination. Our preliminary results are encouraging and will stimulate further research in this direction.</P>
이의진(Uichin Lee),김재정(Jaejeung Kim) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
지금까지의 인터페이스는 사용자와 시스템간의 간극을 최소화 하는 것을 목표로 하고 있다. 이러한 간극의 최소화는 기기의 사용성을 높였지만 반대로 과도사용과 같은 부정적인 문제도 초래하였다. 인터랙션 제한 프레임워크는 긍정적인 행동 유도를 위하여 인터랙션 시스템의 성능을 의도적으로 낮추는 것에 바탕을 두고 있다. 본 논문에서는 설득적 인터랙션 제한에 대한 배경 및 개념을 소개하고 다양한 응용 사례와 연구 방향에 대해서 논의한다.
VAPR: Void-Aware Pressure Routing for Underwater Sensor Networks
Noh, Youngtae,Lee, Uichin,Wang, Paul,Choi, Brian Sung Chul,Gerla, Mario IEEE 2013 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.12 No.5
<P>Underwater mobile sensor networks have recently been proposed as a way to explore and observe the ocean, providing 4D (space and time) monitoring of underwater environments. We consider a specialized geographic routing problem called pressure routing that directs a packet to any sonobuoy on the surface based on depth information available from on-board pressure gauges. The main challenge of pressure routing in sparse underwater networks has been the efficient handling of 3D voids. In this respect, it was recently proven that the greedy stateless perimeter routing method, very popular in 2D networks, cannot be extended to void recovery in 3D networks. Available heuristics for 3D void recovery require expensive flooding. In this paper, we propose a Void-Aware Pressure Routing (VAPR) protocol that uses sequence number, hop count and depth information embedded in periodic beacons to set up next-hop direction and to build a directional trail to the closest sonobuoy. Using this trail, opportunistic directional forwarding can be efficiently performed even in the presence of voids. The contribution of this paper is twofold: 1) a robust soft-state routing protocol that supports opportunistic directional forwarding; and 2) a new framework to attain loop freedom in static and mobile underwater networks to guarantee packet delivery. Extensive simulation results show that VAPR outperforms existing solutions.</P>
DOTS: A Propagation Delay-Aware Opportunistic MAC Protocol for Mobile Underwater Networks
Youngtae Noh,Uichin Lee,Seongwon Han,Wang, Paul,Torres, Dustin,Jinwhan Kim,Gerla, Mario IEEE 2014 IEEE Transactions on Mobile Computing Vol.13 No.4
<P>Mobile underwater networks with acoustic communications are confronted with several unique challenges such as long propagation delays, high transmission power consumption, and node mobility. In particular, slow signal propagation permits multiple packets to concurrently travel in the underwater channel, which must be exploited to improve the overall throughput. To this end, we propose the delay-aware opportunistic transmission scheduling (DOTS) protocol that uses passively obtained local information (i.e., neighboring nodes' propagation delay map and their expected transmission schedules) to increase the chances of concurrent transmissions while reducing the likelihood of collisions. Our extensive simulation results document that DOTS outperforms existing solutions and provides fair medium access even with node mobility.</P>