Eui-Jik Kim

Hallym University, Sŏul, Seoul, South Korea

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Publications (21)7.16 Total impact

  • [Show abstract] [Hide abstract]
    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. · 0.93 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). · 0.92 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; · 0.82 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; · 0.82 Impact Factor
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    ABSTRACT: Delay Attack-Resilient Clock Synchronization for Wireless Sensor Networks
    IEICE Transactions. 01/2012; 95-D:188-191.
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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.
    01/2012;
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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: Power-Controlled Topology Optimization and Channel Assignment for Hybrid MAC in Wireless Sensor Networks
    IEICE Transactions. 01/2011; 94-B:2461-2472.
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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 01/2011; 11(7):6629-44. · 2.05 Impact Factor
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    ABSTRACT: In this letter, we propose an energy efficient hybrid architecture, the Hybrid MAC-based Robust Architecture (HMR), for wireless sensor networks focusing on MAC layer's scheduling and adaptive security suite as a security sub layer. A hybrid MAC layer with TDMA and CSMA scheduling is designed to prolong network life time, and the multi-channel TDMA based active/sleep scheduling is presented. We also present the security related functionalities needed to employ a flexible security suite to packets dynamically. Implementation and testbed of the proposed framework based on IEEE 802.15.4 are shown as well.
    IEICE Transactions. 01/2010; 93-B:1016-1019.
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    ABSTRACT: Many applications in wireless sensor network (WSNs) require energy efficiency. In addition, recently increasing applications sometimes include very sensitive information such as personal related information, and individual health data. However, existing works have not satisfied these requirements of WSN applications. In this paper, we propose an energy-efficient and secure framework for WSNs, which is CSMA and TDMA hybrid approach and provides the multi-channel TDMA based active/sleep scheduling with it. It also includes the security related functionalities to employ a flexible security suite to packets dynamically. We describe the design and implementation of this framework and show the effectiveness of our system by experiments.
    NBiS 2009, 12th International Conference on Network-Based Information Systems, Indianapolis, Indiana, USA, 19-21 August 2009; 01/2009
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    Eui-Jik Kim, Hyo-Hyun Choi
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    ABSTRACT: This paper describes an energy-efficient BOP-based beacon transmission scheduling (EBBS) algorithm. EBBS is the centralized approach, in which a resource-sufficient node called as Topology Management Center (TMC) allocates the time slots to transmit a beacon frame to the nodes and manages the active/sleep schedules of them. We also propose EBBS with Adaptive BOPL (EBBS-AB), to adjust the duration to transmit beacon frames in every beacon interval, adaptively. Simulation results show that by using the proposed algorithm, the energy efficiency and the throughput of whole network can be significantly improved. EBBS-AB is also more effective for the network performance when the nodes are uniformly deployed on the sensor field rather than the case of random topologies.
    Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on; 10/2008
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    ABSTRACT: Many applications in wireless sensor networks (WSNs) require the energy efficiency and scalability. Although IEEE 802.15.4/Zigbee which is being considered as general technology for WSNs enables the low duty-cycling with time synchronization of all the nodes in network, it still suffer from its low scalability due to the beacon frame collision. Recently, various algorithms to resolve this problem are proposed. However, their manners to implement are somewhat ambiguous and the degradation of energy/communication efficiency is serious by the additional overhead. This paper describes an Energy-efficient BOP-based Beacon transmission Scheduling (EBBS) algorithm. EBBS is the centralized approach, in which a resource-sufficient node called as Topology Management Center (TMC) allocates the time slots to transmit a beacon frame to the nodes and manages the active/sleep schedules of them. We also propose EBBS with Adaptive BOPL (EBBS-AB), to adjust the duration to transmit beacon frames in every beacon interval, adaptively. Simulation results show that by using the proposed algorithm, the energy efficiency and the throughput of whole network can be significantly improved. EBBS-AB is also more effective for the network performance when the nodes are uniformly deployed on the sensor field rather than the case of random topologies.
    IEICE Transactions. 01/2008; 91-B:3469-3479.
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    ABSTRACT: In sensor networks, data packets transmitted by different devices in home networking and industrial applications maintain different levels of importance. In this paper, we propose two mechanisms for IEEE 802.15.4 sensor networks to provide multi-level differentiated services which are required by each and every device. Mathematical model based on the discrete-time Markov chain is presented and is analyzed to measure the performance of the proposed mechanisms. Numerical results show the effects of the variation of contention window size and backoff exponent for service differentiation on 802.15.4 sensor networks. From the results, we derive that contention window size is more affective than backoff exponent on the saturation throughput while backoff exponent is more affective than contention window size on the average delay of every device. Simulation results are given to verify the accuracy of the numerical model.
    AEU - International Journal of Electronics and Communications. 01/2007;
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    ABSTRACT: In the sensor networks, each device generates data of different sizes in the home networking and the industrial application according to their roles in the networks. In this paper, we propose a mechanism that provides differentiated services for the IEEE 802.15.4 sensor networks to improve the total throughput and the fairness of the channel. To provide differentiated services for each and every device, our mechanism adds different sizes of backoff period according to the size of packet that is generated by the device. The mathematical model based on the discrete-time Markov chain is presented and is analyzed to measure the performances of the proposed mechanism. Simulation results are also given to verify the accuracy of the analytical model. Finally, the analytical results show the improvement in the throughput and the fairness of the network which applies our mechanism.
    11/2006: pages 231-245;
  • Parallel and Distributed Processing and Applications, 4th International Symposium, ISPA 2006, Sorrento, Italy, December 4-6, 2006, Proceedings; 01/2006
  • Embedded and Ubiquitous Computing - EUC 2005 Workshops, EUC 2005 Workshops: UISW, NCUS, SecUbiq, USN, and TAUES, Nagasaki, Japan, December 6-9, 2005, Proceedings; 01/2005
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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 2013(1). · 0.54 Impact Factor
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    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 2013(1). · 0.54 Impact Factor