Eui-Jik Kim

National Institute for Research in Computer Science and Control, Le Chesney, Île-de-France, France

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Publications (29)16.32 Total impact

  • Taekook Kim, Eui-Jik Kim
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    ABSTRACT: This study proposes a novel caching scheme for content delivery network services. In general, video content users often watch the first part of video clips and then switch to other content. Therefore, a caching scheme is proposed, in which the first part of the frequently referenced content is stored on a solid state drive (SSD) while the remaining video content is stored on a hard disk drive (HDD),. The proposed hybrid (SSD/HDD) caching scheme offers several benefits, such as an improved average data output capacity due to the high average data rate and average hit capacity of the SSD. That is, performance can be significantly improved at a low extra cost with the cache server of a content delivery network (CDN).
    Multimedia Tools and Applications 03/2014; 74(5). DOI:10.1007/s11042-014-2215-8 · 1.06 Impact Factor
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    ABSTRACT: In millimeter Wave wireless personal area networks (mmWave WPANs), the design of efficient concurrent transmission considered high modulations up to a few Gbps is one of the most challenging issues. Even for the concurrent transmission over mmWave networks, the use of directional antenna is highly recommended to guarantee high modulations and to overcome short propagation range caused to high path loss in mmWave frequency. Nevertheless the directional antenna has many advantages, users may suffer from performance degradation due to coverage limitation of wide beamwidth, when the concurrent transmission supports the multicast communication for the target applications such as conference room, wireless displays and room gaming. In this paper, we propose a multi-hop-based opportunistic concurrent directional transmission (M-OCDT) scheme for the directional multicast communication where the relay mechanism is generated depending on the locations of multicast users to maximize the sum rate. The proposed M-OCDT scheme is designed based on the IEEE 802.15.3c standard and supports the optimized searching algorithm for the relay users. Extensive simulation results demonstrate that the M-OCDT scheme can improve the average overall throughput by 81 to 89 % compared with the conventional non-relay directional multicast procedure.
    Multimedia Tools and Applications 03/2014; 74(5). DOI:10.1007/s11042-014-1959-5 · 1.06 Impact Factor
  • International Journal of Distributed Sensor Networks 01/2014; 2014:1-10. DOI:10.1155/2014/683146 · 0.92 Impact Factor
  • Taekook Kim, Eui-Jik Kim
    International Journal of Distributed Sensor Networks 01/2014; 2014:1-6. DOI:10.1155/2014/297689 · 0.92 Impact Factor
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    ABSTRACT: This paper presents the design and performance evaluation of a stable pairwise time synchronization protocol (abbreviated SPS) for capillary machine-to-machine (M2M) networks that provides underlying platform independence and operational stability, even under harsh conditions. SPS achieves the first criterion using a novel technique whereby the M2M device captures incoming or outgoing moments of timing messages. The second criterion is achieved by adaptively adjusting the resynchronization interval. Extensive simulations are conducted to demonstrate the validity and effectiveness of SPS.
    Computers & Electrical Engineering 10/2013; 39(7):2207-2213. DOI:10.1016/j.compeleceng.2012.12.004 · 0.99 Impact Factor
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    ABSTRACT: This paper considers the internetwork interference problem in environments with multiple wireless body area networks (WBANs). We propose an asynchronous internetwork interference avoidance scheme (abbreviated as AIIA), which is based on the hybrid multiple access of carrier sense multiple access with collision avoidance (CSMA/CA) and time division multiple access (TDMA). In AIIA, the gateway device of each WBAN maintains a table, called an AIIA table, which includes the timing offset and TDMA transmission schedule information corresponding to the interfering WBANs. By referring to the table, the conflicting TDMA schedule can be checked and updated by itself, in asynchronous and distributed manners. Extensive simulations are conducted to demonstrate the feasibility and effectiveness of AIIA.
    The Journal of Supercomputing 08/2013; 65(2). DOI:10.1007/s11227-012-0840-4 · 0.84 Impact Factor
  • Jung-Hyok Kwon, Eui-Jik Kim
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    ABSTRACT: This paper focuses on a wireless solution for vehicular infrastructure systems. In order to achieve both low cost and high efficiency, infrastructures can be connected to each other in vehicular networks by a wireless link similar to a mesh router in wireless mesh networks (WMNs). However, the existing WMN solutions cannot appropriately support various vehicular applications that require high rate and low latency communications. Therefore, in this paper, we present the design and performance evaluation of an adaptive multi-channel allocation for vehicular infrastructure mesh systems (abbreviated AMCA). In order to meet both high rate and low latency communications, AMCA is designed to provide optimal channel assignment duration for each flow to efficiently utilize multiple non-overlapping channels. The performance evaluation of AMCA is conducted by the QualNet 5.0 simulator under various network scenarios to consider diverse network conditions. Simulation results show that AMCA can achieve higher network throughput and lower average packet delay than other well known wireless solutions.
    Multimedia Tools and Applications 03/2013; 74(5). DOI:10.1007/s11042-013-1752-x · 1.06 Impact Factor
  • Source
    Eui-Jik Kim, Sungkwan Youm
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    ABSTRACT: Nowadays, machine-to-machine (M2M) communication is being considered as the most promising solution for revolutionizing the future intelligent pervasive applications. This article presents the design of an M2M service platform architecture and prototype implementation of a home automation system based on the designed M2M platform. The proposed service platform consists of three subsystems: M2M service enablement, M2M device management, and M2M communication management. These subsystems include the essential function blocks and interact with each other to horizontally accommodate various M2M applications. The prototype implementation of the full “smart home automation” system, including the M2M service platform, M2M area network, and user/administrator domains, shows the feasibility of the proposed M2M platform architecture.
    EURASIP Journal on Wireless Communications and Networking 01/2013; 2013(1). DOI:10.1186/1687-1499-2013-79 · 0.81 Impact Factor
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    Sungkwan Youm, Taeshik Shon, Eui-Jik Kim
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    ABSTRACT: With the rapid growth of broadband network deployment and multimedia streaming development, Internet protocol (IP) multicast networks have become a delivery mechanism for Internet protocol television (IPTV). IPTV provides a two-way interactive service to the viewers, which generates the path request for IP multicast network. Thus, it is essential to evaluate the path rejection probability accurately and further to reduce it. In this paper, we propose a new dynamic multicast routing algorithm for broadband IPTV services and apply it to three legacy algorithms. These integrated multicast routing algorithms support the minimum cost and the traffic engineering features, in order to maximize the acceptance rate for bandwidth constraint path request under IPTV service environments. Furthermore, we compare their network performances in terms of the acceptance rate and delay by experimental simulations. The simulation result gives us that the nearest node first Dijkstra algorithm can be the optimal solution of multicast connection for IPTV service delivery.
    EURASIP Journal on Wireless Communications and Networking 01/2013; 2013(1). DOI:10.1186/1687-1499-2013-127 · 0.81 Impact Factor
  • Sungkwan Youm, Eui-Jik Kim
    Journal of Applied Mathematics 01/2013; 2013:1-9. DOI:10.1155/2013/792529 · 0.72 Impact Factor
  • Eui-Jik Kim, Sungkwan Youm
    International Journal of Distributed Sensor Networks 01/2013; 2013:1-6. DOI:10.1155/2013/473609 · 0.92 Impact Factor
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    Taeshik Shon, Hyo Hyun Choi, Eui-Jik Kim
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    ABSTRACT: In recent times, machine-to-machine (M2M) communication is considered the most promising solution for revolutionizing future intelligent pervasive applications. The capillary M2M network is a key component of the M2M system, and it should support a data rate that is sufficient to accommodate various vertical applications with limited resources of end devices. This paper presents a joint routing and scheduling (JRS) framework for a capillary M2M network. To achieve the conflicting goals of maximizing network performance and conserving energy, the JRS framework is designed with an integrated concept of routing and transmission scheduling, which provides time division multiple access (TDMA)-based transmission scheduling based on the established routing path of data. Moreover, to extend the number of available transmission frames and enhance network performance, JRS uses the multi-channel communication approach. Experimental results of the prototype implementation demonstrate that JRS outperforms conventional schemes, even under heavy traffic conditions.
    EURASIP Journal on Wireless Communications and Networking 01/2013; 2013(1). DOI:10.1186/1687-1499-2013-126 · 0.81 Impact Factor
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    ABSTRACT: This paper presents the design and performance evaluation of a latency bounded and energy efficient MAC scheme (abbreviated to LB-MAC) for wireless sensor networks that require time-critical communication. LB-MAC provides the predictability for an end-to-sink data delivery time through the TDMA multi-channel transmission frame assignment considering the routing path of a tree network. The feasibility and effectiveness of LB-MAC is demonstrated through extensive simulation based comparisons with prior research.
    Information Networking (ICOIN), 2013 International Conference on; 01/2013
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    ABSTRACT: Directional antennas have the considerable benefits of higher antenna gain, long transmission distance and spatial reuse compared to omni?antennas. To support a directional antenna, IEEE 802.15.3c specifies a high data transmission rate and short frequency range communication based on the characteristics of 60GHz band. However, the contention?based protocol of IEEE 802.15.3c may cause channel collisions and throughput degradation as the number of stations in the network increases. In order to resolve this problem and reduce channel access latency, we propose an adaptive allocation algorithm in which the contention window size for optimal transmission probability is derived after the directional information has been obtained by means of AP control procedures. Extensive simulations demonstrate that the proposed algorithm outperforms the existing channel access scheme in IEEE 802.15.3c wireless personal area networks under different situations, especially when the number of contending stations is large.
    International Journal of Advanced Robotic Systems 04/2012; DOI:10.5772/50914 · 0.50 Impact Factor
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    ABSTRACT: This paper presents an analytical model for the performance evaluation of an IEEE 802.11e network in non?saturation environments. We first characterize the probability distribution of the MAC layer packet service time. Based on the probability distribution model of the MAC layer packet service time, we then study the queuing performance of the wireless local area networks (WLANs) at different traffic loads based on the IEEE 802.11e MAC protocol. The numerical results show that we can choose a feasible number and bandwidth of the node which determines the system performance that a user demands.
    International Journal of Advanced Robotic Systems 04/2012; DOI:10.5772/50911 · 0.50 Impact Factor
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    ABSTRACT: Directional antenna is essentially recommended to use in 60GHz band communication due to the characteristics of high path loss and short communication range. However, a number of directional antenna related researches have been considered to cover just the only specific service region. Therefore, in this paper, we propose a coverage adaptive directional MAC (abbreviated to CAD-MAC) for mmWave WPAN that dynamically assigns a sector based on variable device locations. CAD-MAC provides higher throughput and energy efficiency. It can also cover every devices placed in a certain area. To evaluate its performance, we compare CAD-MAC with the existing MAC protocols in general service model.
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    ABSTRACT: This paper presents the design and performance evaluation of a delay attack-resilient clock synchronization scheme (abbreviated to DARCS) for wireless sensor networks. In order to provide both synchronization accuracy and robustness, we propose a novel three-way handshake-based protocol, which completely excludes non-deterministic factors such as random backoff durations and unexpected hardware interrupts in a software manner and, in this way, the node can accurately estimate the relative clock offset and the end-to-end delay between a pair of nodes. Consequently, DARCS makes it possible to correct time synchronization errors as well as to detect delay attacks precisely. The simulation results show that DARCS achieves a higher synchronization accuracy and is more resilient to delay attacks than the other popular time synchronization schemes.
    IEICE Transactions on Information and Systems 01/2012; 95-D(1):188-191. DOI:10.1587/transinf.E95.D.188 · 0.19 Impact Factor
  • International Journal of Advanced Robotic Systems 01/2012; DOI:10.5772/50256 · 0.50 Impact Factor
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    ABSTRACT: The use of directional antennas in ad-hoc networks has advantages such as high spatial reuse and extended antenna range. However it suffers from the deafness problem, which may significantly degrade the network performance. Recently, several directional MAC protocols have been proposed to manage directional antennas effectively and improve the network performance. However, the existing schemes do not adequately address the issues, because they do not consider the multi-rate environment and the overhead to establish communication with the adjacent devices. This paper presents a directional cooperative MAC scheme, in which data is delivered to a destination via a relay node equipped with a directional antenna. Simulation results show that the network performance is improved by using the proposed scheme.
    Information Networking (ICOIN), 2012 International Conference on; 01/2012
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    ABSTRACT: Nowadays, with wireless sensor networks (WSNs) being widely applied to diverse applications, heterogeneous sensor networks (HSNs), which can simultaneously support multiple sensing tasks in a common sensor field, are being considered as the general form of WSN system deployment. In HSNs, each application generates data packets with a different size, thereby resulting in fairness issues in terms of the network performance. In this paper, we present the design and performance evaluation of a differentiated channel access scheme (abbreviated to DiffCA) to resolve the fairness problem in HSNs. DiffCA achieves fair performance among the application groups by providing each node with an additional backoff counter, whose value varies according to the size of the packets. A mathematical model based on the discrete time Markov chain is presented and is analyzed to measure the performance of DiffCA. The numerical results show that the performance degradation of disadvantaged application groups can be effectively compensated for by DiffCA. Simulation results are given to verify the accuracy of the numerical model.
    Sensors 12/2011; 11(7):6629-44. DOI:10.3390/s110706629 · 2.05 Impact Factor

Publication Stats

61 Citations
16.32 Total Impact Points


  • 2014
    • National Institute for Research in Computer Science and Control
      Le Chesney, Île-de-France, France
  • 2013
    • Hallym University
      • Department of Ubiquitous Computing
      Sŏul, Seoul, South Korea
    • Samsung Advanced Institute of Technology
      Usan-ri, Gyeonggi Province, South Korea
  • 2007–2013
    • Korea University
      • Department of Electrical Engineering
      Sŏul, Seoul, South Korea