Youngsong Mun

Soongsil University, Sŏul, Seoul, South Korea

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Publications (117)41.48 Total impact

  • Kyunghye Lee · Youngsong Mun
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    ABSTRACT: To manage limited energy resources efficiently, IEEE 802.16e specifies sleep mode operation. Since there can be no communication between the mobile station (MS) and the serving base station (BS) during the unavailability interval, the MS can power down its physical operation components. We propose an improved power saving mechanism (iPSM) which effectively increases the unavailability interval of Type I and Type II power saving classes (PSCs) activated in an MS. After investigating the number of frames in the unavailability interval of each Type II PSC when used with Type I PSC, the iPSM chooses the Type II PSC that yields the maximum number of frames in the unavailability interval. Performance evaluation confirms that the proposed scheme is very effective.
    No preview · Article · Apr 2012 · IEICE Transactions on Communications
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    Kyunghye Lee · Seonggeun Ryu · Youngsong Mun
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    ABSTRACT: The IEEE 802.16e standard enhances the IEEE 802.16 for the mobility support. Mobile stations can move while receiving services, thus ongoing IP sessions may be maintained during a handover in the IEEE 802.16e. To reduce handover latency, the idea of cross-layer handover which incorporates layer 2 handover with IP layer has been devised. Various cross-layer handover schemes supporting fast handover in the IEEE 802.16e networks have been proposed. However, the problem of the conventional cross-layer fast handover schemes is that they are heavily influenced by the new address confirmation latency which is the most time-consuming procedure. In this paper, we propose an enhanced cross-layer fast handover scheme which is not susceptible to the new address confirmation latency. Detailed performance analysis is performed in terms of the signaling costs and the handover latencies to show the effectiveness of the proposed scheme compared with the conventional ones. The results of the performance evaluation confirm the effectiveness of the proposed scheme.
    Full-text · Article · Feb 2012 · The Journal of Supercomputing
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    Seonggeun Ryu · Kyunghye Lee · Youngsong Mun
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    ABSTRACT: In the future cloud computing, users will heavily use mobile devices. Mobile networks for cloud computing should be managed efficiently as well as support seamless services to mobile users regardless of their locations and movements. Hence, in mobile networks for cloud computing, it is important to support seamless mobility management to mobile users who request real-time services such as VoIP, streaming, and interactive game playing. To support seamless mobility management for various wireless technologies in cloud computing, Mobile IPv6 (MIPv6) and fast handovers for MIPv6 (FMIPv6) have been studied. FMIPv6 has been emerged to reduce long handover latency and packet loss in MIPv6. FMIPv6 may provide seamless handover by minimizing the handover latency, and prevent packet loss through buffering and tunneling. FMIPv6 uses anticipation based on layer 2 trigger information, and consists of two operation modes such as the predictive mode and the reactive mode. Several works have been done to evaluate the performance of FMIPv6 in different network environments. However, the previous works did not consider the probability of predictive mode failure (PPMF) that distinguishes two operation modes. Even in the most previous work, two operation modes of FMIPv6 are evaluated separately. However, to accurately analyze the overall performance of FMIPv6, two operation modes should be analyzed altogether. In this paper, FMIPv6 combining two operation modes is analyzed considering the PPMF that is affected by the radius of a cell, velocity of mobile nodes, and the layer 2 triggering time. The effect of system parameters, such as the PPMF, the time required to process additional layer 3 signaling, and the layer 2 trigger time, is analytically investigated with respect to the signaling cost and the packet delivery cost. Analytical results show a trade-off between performance and system parameters. Then we show methods to optimize overhead of FMIPv6. Finally, mobile networks for cloud computing can be efficiently managed through the optimized FMIPv6.
    Full-text · Article · Feb 2012 · The Journal of Supercomputing
  • Kyunghye Lee · Youngsong Mun
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    ABSTRACT: A mobile station (MS) in an IEEE 802.16e network manages its limited energy using the sleep mode operation. An MS can power down its physical operation components during the unavailability interval of the sleep mode. To reduce energy consumption by increasing the unavailability interval, this paper proposes an enhanced power saving mechanism (ePSM) when both activated Type I and Type II power saving classes (PSCs) exist in an MS. A performance evaluation confirms that ePSM results in the improved performance in terms of the unavailability interval as well as the energy consumption than conventional schemes.
    No preview · Article · Sep 2011 · IEICE Transactions on Communications
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    ABSTRACT: The MR (Mobile Router) by existing top-down or bottom-up methods may not be the optimal MR if the numbers of mobile nodes and routers are substantially increased, and the scale of the network is increased drastically. Since an inappropriate MR decision causes handover or binding renewal to mobile nodes, determining of the optimal MR is important for efficiency. In this paper, we propose an algorithm that decides on the optimal MR using MR QoS information, and we describe how to understand the various structured MLP (Multi-Layered Perceptron) based on the algorithm. In conclusion, we prove the ability of the suggested neural network for a nesting mobile network through the performance analysis of each learned MLP.
    No preview · Article · May 2011 · The Journal of Supercomputing
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    Jegyun Na · Seonggeun Ryu · Kyunghye Lee · Youngsong Mun
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    ABSTRACT: In PMIPv6 all packets sent by mobile nodes or correspondent nodes are transferred through the local mobility anchor This unnecessary detour results in high delivery latency and significant processing cost Several PMIPv6 route optimization schemes have been proposed to solve this issue However they also suffer from the high signaling costs when determining the optimized path The proposed scheme which adopts the prediction algorithm in PFMIPv6 can reduce the signaling costs of the previous schemes Analytical performance evaluation is performed to show the effectiveness of the proposed scheme
    Full-text · Article · Nov 2010 · IEICE Transactions on Communications
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    Sooyeol Ryu · Misun Kim · Youngsong Mun
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    ABSTRACT: The Internet Engineering Task Force (IETF) has standardized Proxy Mobile IPv6 (PMIPv6). Fast Handovers for Proxy Mobile IPv6 (PFMIPv6) was studied by mipshop working group to reduce packet loss in PMIPv6. PFMIPv6 is fast handover extension of PMIPv6. PFMIPv6 handover latency is longer than PMIPv6, although it reduces packet loss in PMIPv6. In this paper, we propose Enhanced PFMIPv6 to reduce handover latency. In the proposed scheme, the Proxy Binding Update (PBU) message is sent to Local Mobility Agent, in advance, when new mobile access gateway (NMAG) receives the Handover Initiate (HI) message. The HI message includes necessary information to build PBU. We analyze the performance of EPFMIPv6 compared with PMIPv6 and PFMIPv6 mathematically.
    Preview · Conference Paper · Aug 2009
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    Seonggeun Ryu · Youngsong Mun
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    ABSTRACT: Mobile IPv6 (MIPv6) is a protocol to support mobility for IPv6. Fast Handovers for MIPv6 (FMIPv6) have been studied, since in MIPv6 handover latency is long, and all packets are lost during handover. FMIPv6 provides seamless handover by minimizing handover latency, and prevents packet loss through buffering and tunneling. FMIPv6 uses anticipation based on layer 2 trigger information, and consists of two modes such as predictive mode and reactive mode. Several works have been done to evaluate the performance of FMIPv6 in different network environments. However, the previous works did not consider probability of predictive mode failure that classifies the two modes. Also, in the most previous works the two modes of FMIPv6 are evaluated separately. In this paper, FMIPv6 combining the two modes is analyzed through probability of predictive mode failure, since FMIPv6 is just a protocol. We investigate probability of predictive mode failure to find important elements in network environment. Then, FMIPv6 is analyzed by these elements for performance evaluation with respect to various metrics like signaling cost, delivery cost, and buffering cost. Numerical results show a trade-off between performance and system parameters. Then, we shows methods to optimize FMIPv6 using probability of predictive mode failure and layer 2 trigger time.
    Full-text · Conference Paper · Aug 2009
  • Kyunghye Lee · Youngsong Mun
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    ABSTRACT: IEEE 802.16e adds mobility support to the IEEE 802.16 standard so that terminals can move while receiving services and preserve ongoing IP sessions during handover. IP layer handover for MSs is handled by MIPv6. The cross-layer scheme supports seamless handover by exploiting the link layer handover indicator and designing interleaving scheme of the 802.16e and the FMIPv6 handover procedures. We propose an optimized cross-layer scheme supporting fast handover for MIPv6 over IEEE 802.16e environment. We evaluate the performance of the original scheme and the proposed scheme in terms of the signaling cost and handover latency by using the packet-level traffic model, system mode land mobility model. From the results of the performance evaluation, we can expect that the proposed scheme supports fast handover for MIPv6 insusceptible of the new address confirmation latency.
    No preview · Conference Paper · Aug 2009
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    ABSTRACT: One of the main challenges of today’s analytical geography is the back-linking of observed phenomena to individual actions, as not determined by individuals’ structural situation in a one-goal society but by their very choice of spatial goals, i.e. by what shall be called individuals’ actor-dimension. In this paper we present an actor-based model of urban residential mobility. Results show that public policies in urban development must take into account and act on this actor-dimension if they are not to obtain effects opposite to their aims.
    Full-text · Article · Jul 2009
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    Seonggeun Ryu · Youngsong Mun
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    ABSTRACT: Mobile IPv6 (MIPv6) is a presentative protocol which supports global IP mobility. MIPv6 causes a long handover latency that a mobile node (MN) cannot send or receive packets. This latency can be reduced by using Proxy Mobile IPv6 (PMIPv6). PMIPv6 is a protocol which supports IP mobility without participation of the MN, and is studied in Network-based Localized Mobility Management (NETLMM) working group of IETF. There is much packet loss during handover in PMIPv6, although PMIPv6 reduces handover latency. In this paper, to reduce packet loss in PMIPv6 we propose Packet Lossless PMIPv6 (PL-PMIPv6) with authentication. In PL-PMIPv6 a previous mobile access gateway (pMAG) registers to a Local Mobility Anchor (LMA) on behalf of a new MAG (nMAG) during layer 2 handoff. Then, the nMAG buffers packets during handover after registration. Therefore, PL-PMIPv6 can reduce packet loss in MIPv6 and PMIPv6. Also, we use Authentication, Authorization and Accounting (AAA) infrastructure to authenticate the MN and to receive MN’s profiles securely. For the comparison with MIPv6 and PMIPv6, detailed performance evaluation is performed. From the evaluation results, we show that PL-PMIPv6 can achieve low handover latency and low total cost.
    Full-text · Article · Jan 2009

  • No preview · Article · Jan 2009 · Lecture Notes in Computer Science

  • No preview · Conference Paper · Jan 2009
  • Duckki Kim · Youngsong Mun
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    ABSTRACT: The purpose of this study addresses service model for enhancement u-learning system’s utilization on adaptive instruction system. Proposed service model include two systems. The one is the U-book system and the other is the preWBI system. Proposed service model should be able to retrieve information without ubiquitous computing technology and to access on line contents unless location of them. Under more individualized instruction environment, proposed service model support maximum utilization of u-learning system for adaptive instruction system.
    No preview · Article · Jan 2009
  • Joo-Hyung Kwon · Gye-Young Kim · Youngsong Mun
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    ABSTRACT: This paper proposes an efficient method for warping facial features. The existing methods use points, which are standard for facial features warping, without the reason or calculation. And existing methods have difficulties for facial feature warping. We estimate the standard points by using BSM(Bayeian Shape Model). From the experiment results for the various image, the proposed algorithm shows more natural results than the conventional algorithm and is more efficient than ASM(Active shape model).
    No preview · Conference Paper · Jun 2008
  • Kyunghye Lee · Miyoung Kim · Gye-Young Kim · Youngsong Mun
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    ABSTRACT: Introduction of IPv6 protocol in IEEE 802.16e based network without any modification could occur many problems due to IEEE 802.16 standard’s point-to-multipoint and connection oriented features and absent of the native multicast support. In this paper, we propose a method for supporting address autoconfiguration and DAD mechanism to the IPv6 nodes in IEEE 802.16e based network. The proposed scheme uses multicast and broadcast service (MBS) and the service’s transport connection identifiers (MCIDs) and assigns them to the IPv6 node as soon as the nodes complete the layer 2 handover. Using the proposed scheme, IPv6 nodes in IEEE 802.16e network can exchange the ND messages sent to the multicast address. We analyze the network resource usages for the existing method and the proposed scheme. Through the performance evaluation, we see that the proposed scheme can reduce the whole network resource usage up to maximum 32 percent.
    No preview · Conference Paper · Jun 2008
  • Young Jae Park · Youngsong Mun · Keun Su Lee · Gye-Young Kim
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    ABSTRACT: In this paper, we propose that method of extract changing scene in animation. A new method differed about attributes of animation based on already exist one. We mix histogram method and block method plus new things. We found it much improved than traditional method.
    No preview · Conference Paper · Jun 2008
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    ABSTRACT: The scheme proposed in this thesis organizes dynamically clusters at the time of events occurrence and maintains them. The other side, the existing cluster based USN (ubiquitous sensor networks) organize at the network initial time in a lump. So the existing method causes of much energy exhaustion. Therefore the scheme proposed in this thesis can be more efficient than the existing one in the aspect of the energy usage and the gathering and sending data. In order to efficiently process various events, the scheme proposed in this thesis divides a cluster when the other events occurred in the area which the cluster organized in. In another case, it merges clusters when a same event occurs in a different near cluster. Like above, the scheme of this thesis dynamically organizes clusters in the node centeredness. The simulation to evaluating the scheme shows that the scheme of this thesis increase the performance by maximumly 50% compared with the existing study.
    No preview · Conference Paper · Jun 2008
  • Source
    Seonggeun Ryu · Gye-Young Kim · Byunggi Kim · Youngsong Mun
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    ABSTRACT: Mobile IPv6 (MIPv6) is a presentative protocol which supports global IP mobility. MIPv6 causes a long handover latency that a mobile node (MN) doesnpsilat send or receive packets. This latency can be reduced by using Proxy Mobile IPv6 (PMIPv6). PMIPv6 is a protocol which network supports IP mobility without participation of the MN, and is studied in Network-based Localized Mobility Management (NETLMM) working group of IETF. There is much packet loss during handover in PMIPv6, although PMIPv6 reduces handover latency. In this paper, to reduce packet loss in PMIPv6 we propose Packet Lossless PMIPv6 (PL-PMIPv6) with authentication. In PL-PMIPv6 a previous mobile access gateway (pMAG) registers to a Local Mobility Anchor (LMA) on behalf of a new MAG (nMAG) during layer 2 handoff. Then, the nMAG buffers packets during handover after registration. Therefore, PL-PMIPv6 can reduce packet loss than them in MIPv6 and PMIPv6. Also, we use Authentication,Authorization and Accounting (AAA) infrastructure to authenticate the MN and to receive MNpsilas profiles securely. We shows performance of PL-PMIPv6 through comparison of packet loss during handover of MIPv6, PMIPv6 and PL-PMIPv6.
    Full-text · Conference Paper · Jun 2008
  • Misun Kim · Youngsong Mun
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    ABSTRACT: This paper investigates differentiated services in heterogeneous mobile IP networks using a distributed method that supports service differentiation and admission control. Mobility and quality of service (QoS) are becoming more important issues in mobile networks. It is general that the traditional Internet service provides the same level of service to all users. However, new type of services demand better QoS and host mobility according to wireless and Internet technologies have being speedily developed. To satisfy these requirements, we deploy differentiated service (Diffserv) model to provide various demand of new application in heterogeneous mobile IP networks. The operational procedures and cost evaluation schemes for seamless connection during a mobile node (MN) changes its network attachment point are proposed while satisfying its QoS requirement. We present through simulation that our distributed virtual schemes are applied to the admission control of the radio channel then a globally stable state can be maintained without the need for complex centralized radio resource management. Finally, we discuss a distributed service level management scheme that builds on the proposed algorithms to offer continuous service with handoff.
    No preview · Conference Paper · Jun 2008

Publication Stats

252 Citations
41.48 Total Impact Points

Institutions

  • 1995-2012
    • Soongsil University
      • Department of Computing
      Sŏul, Seoul, South Korea
  • 2005
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 2003
    • Korea Polytechnic University
      • Department of Computer Engineering
      Sŏul, Seoul, South Korea