Wireline Networking Area (유선망 분야)

Wireline Networking Area

We had extensive studies on high performance multiservice and IP networking in terms of the following research issues:

• Multiservice Switch Architecture

• Traffic Modeling

• Next Generation Network Architecture VoIP Networks

• Multipoint Communications

• Network Protocols

• IP Router Architecture

• Multicast Switch Architecture

• Switch Chipsets

• Multi-Protocol Label Switching (MPLS) Network

• Traffic Arbitration

• IP traffic modeling/generation/monitoring

• Traffic Control/Priority Scheduling

• Bandwidth Estimation & Control

• Call Admission Control

• QoS Estimation & Monitoring

• Traffic Generation and Monitoring

• Signaling Networks/Intelligent networks

• Performability of Communication Networks

• Switch/Router Simulators for Performance Evaluation, etc.

■System Level Simulators for Performance Evaluation

• No.7 signaling network simulator for KT  No. 7 signaling network

• Various ATM high speed switches developed by ETRI and Korean companies

• Multiservice Switch

• Large scale router for IP and TDM traffic

(1) Selected Papers

       <Multiservice Switch Architecture>

• S.Y. Nam, S. Kim, D.K. Sung, “Estimation of Available Bandwidth for an M/G/1 Queueing System,” Applied Mathematical Modelling, vol. 33, no. 8, pp.3299-3308, Aug. 2009.

• S.Y. Nam, S. Kim, D.K. Sung, “Measurement Based Admission Control at Edge Routers,” IEEE/ACM Transactions on Networking, vol. 16, no.2, pp.410-423, April 2008.

• S.H. Kang, C. Oh, D.K. Sung, “Performance Evaluation of a High-Speed ATM Switch with Multiple Separated Common Memories,”  IEEE Trans. on Communications, vol.50, No.2, pp.332-340, Feb. 2002.

• S.H.Byun and D.K.Sung, “The UniMIN Switch Architecture for Large-Scale ATM Switches,” IEEE/ACM Trans. on Networking, vol.8, no.1, pp.109-120, Feb. 2000.

• J.W, Heo, D.K. Sung, “A New Fast Cell Re-sequence Mechanism for Multi-Path ATM Switches,” IEEE Communications Letters, Vol.3, No.10, pp.297-299, Oct., 1999.

• S.H. Byun, D.K. Sung, “ A General Expansion Architecture for Large Scale Multicast ATM Switches,”  IEICE Trans. on Communications, Vol.E80-B, No.11, pp.1671-1679, 1997.

• S.K. Roh, K.H. Kook, J.S. Lee, M.Y. Chung, and D.K. Sung, "Performance of a Time Slot Searching Mechanism in Multi-Rate Circuit Switching Systems,” S.K.Roh, K.H.Kook, J.S.Lee, M.Y.Chung, and D.K.Sung, IEICE Trans. on Communications(Japan), vol. E77-B, No. 5, pp.650-655, 1994.

  <Traffic Modeling>

• S.Kim, J.Y.Lee, D.K.Sung, “A Shifted Gamma Distribution Model for Long-Range Dependent Internet Traffic,” IEEE Communications Letters, vol. 7, no. 3, pp. 124-126, March 2003.

• S.H.Kang, Y.H.Kim, D.K.Sung, B.D.Choi, “An Application of Markovian Arrival Process (MAP) to Modeling Superposed ATM Cell Streams,” IEEE Trans. on Communications, vol. 50, no. 4, pp.633-642, April 2002.

   <Traffic Control/Priority Scheduling>

• B.D.Choi, S.H.Choi, D.K.Sung, T.H.Lee, K.S.Song, “Transient Analysis of a Markovian Arrival Queue with Congestion Control Based on Thresholds,” Journal of Applied Mathematics and Stochastic Analysis, vol.12, no.4, pp.371-392, 1999.

• D.I.Choi, B.D.Choi, D.K.Sung, "Performance Analysis of Priority Leaky Bucket Scheme with Queue-Length-Threshold Scheduling Policy,” IEE Proceedings-Communications, vol. 145, no. 6, pp.395-401, November, 1998.

• H.J. Kim, D.K. Sung, “An Enhanced Priority Reservation Algorithm for ATM Multicast Switches with a One-Shot Scheduling Scheme,” IEICE Trans. on Commun., Vol. E-81-B, No. 11, pp.2237-2241, November, 1998.

• B.D.Choi, D.I.Choi, Y.Lee, D.K.Sung, "Priority Queueing System with Fixed-Length Packet Train Arrivals,” IEE-Proc. Communications, vol. 145, no. 5, pp.331-336, October, 1998.  

   <Bandwidth Estimation & Control>

• J.Y. Lee, S. Kim, D.S. Kim, D.K. Sung, “Bandwidth Optimization for Internet Traffic in Generalized Processor Sharing Servers,” IEEE Trans. on Parallel and Distributed Systems, vol. 16, no.4, pp.324-334, April 2005.

• J.Y. Lee, Sunggon Kim, D.K. Sung, “Fluid Simulation for Self-Similar Traffic in Generalized Processor Sharing Services,” IEEE Communications Letters, vol. 7, no. 6, pp.272-274, June 2003

         <Call Admission Control>

• S.H.Kang, D.K.Sung, “A CAC Scheme Based on Real-Time Cell Loss Estimation for ATM Multiplexers,” IEEE Trans. on Communications, Vol.48, No.2, pp.252-258, Feb. 2000.

• S.H.Kang, D.K.Sung, "A Trial Multilayer Perception Neural Network for ATM Connection Admission Control,” IEICE Trans. on Communications(Japan), vol. E76-B, No. 3, pp.258-262, 1993.

    <QoS Estimation & Monitoring>

• S.Y.Nam, D.K.Sung, “Fast Convolution Approximation Scheme for Estimating End-to-End Delay Performance,” IEE Electronics Letters, vol.36, no.16, pp.1432-1434, Aug. 2000.

   <Traffic Generation and Monitoring>

• S.Y.Nam, S. Kim, J. Kim, D.K. Sung, “Probing-Based Estimation of End-to-End Available Bandwidth,” IEEE Communications Letters, vol. 8, no. 6, pp.400-402, June 2004

• S.H.Kang, D.K.Sung, B.D.Choi, "An Empirical Real-Time Approximation of Waiting Time Distribution in MMPP(2)/D/1,” IEEE Communications Letter, vol.2, no.1, pp.17-19, Jan.1998.

• S.H. Kang, C. Oh, D.K. Sung, "A Traffic Measurement Based Modeling of Superposed ATM Cell Streams,” IEICE Trans. on Commun., Vol.E80-B, No.3, pp.434-441, 1997. 

    <Signaling Networks/Intelligent Networks>

• J.U. You, M.Y. Chung, D.K. Sung, “Performance Evaluation Using an Approximation Method for Sojourn Time Distributions in an IN/ISDN Signaling Platform,” Computer Communications, vol. 25, No. 14, pp.1283-1296, July 2002.

• S.J. Kwon, M.Y. Chung, D.K. Sung, “A Location Management Scheme for Support Non-Geographic Phone Numbers in Personal Communications Services,” Computer Communications, Vol.224, pp.271-283, 2001.

• M.Y. Chung, D.K. Sung, “Performance Analysis of a Profile Management Scheme for Incall Registration/Deregistration in Wireline UPT Networks - Part II : Timer-Based Scheme,”  IEICE Trans. on Communications, Vol.E84-B, No.2, pp.191-203, Feb. 2001.

• E.S.Bae, M.Y.Chung, D.K.Sung,“Performance Analysis of Fixed Local Anchor Scheme for Supporting UPT Services in Wireline Networks,” Computer Communications, Vol.23, pp.1763-1776, 2000.

• B.D.Choi, S.H.Choi, B.Kim, D.K.Sung, “Analysis of Priority Queueing system Based on Thresholds and Its Application to Signaling System No.7 with Congestion Control,” Computer Networks, pp.149-170, 2000.

• M.Y.Chung, S.H.Kang, D.K.Sung,“Performance Analysis of Two Schemes for Managing Information Related to Incall Registration in Wireline UPT Networks,” Computer Communications, vol.22, pp.1592-1606, 1999.

• M.Y.Chung, J.U.You, D.K.Sung and B.D.Choi,“Performability Analysis of Common Channel Signaling Networks Based on the Signaling System # 7,” IEEE Trans. on Reliability, vol.48, No.3, pp.224-233, Sep. 1999.

• M.Y.Chung, D.K.Sung,“Performance Analysis of a Profile Management Scheme for Incall Registration/Deregistration in Wireline UPT Networks - Part I. Request-Based Scheme,” IEICE Trans. on Communications, Vol.E82-B, No.5, pp.686-694, May.1999. 

• S.H.Choi, B.D.Choi, D.K.Sung,"Analysis of a Leaky Bucket Control Scheme in Signaling System No. 7 Network,” IEE-Proceedings-Comm. Vol.145, No.1, pp.25-32, Feb. 1998.

 <Performability of Communication Networks>

• K.S. Sohn, S.Y. Nam, D.K. Sung,“A Spare Bandwidth Sharing Scheme Based on Network Reliability,” IEEE Trans. on Reliability, vol. 54, no.1, pp.123-132, March 2005.

         <Switch/Router Simulators for Performance Evaluation>

• J.W.Heo, S.H.Byun, J.Y.Lee, D.K.Sung, S.J.Lee,“Cell Level/Call Level Switch Simulator for HAN/B-ISDN ATM Switching System,” Telecommunication Systems, Vol.14, pp.291-310, Aug. 2000.

(2)  Conference Papers

• W.Y. Park, J.Y. Lee, D.K. Sung, “Bandwidth Optimization Algorithm Based on Bandwidth Ratio Adjustment in Generalized Process Sharing Servers,” IEEE ICC 2006, July 2006. 

• S.Y. Nam, S. Kim, D.K. Sung, “Minimal Backlogging Method for Estimation of Available Bandwidth,” IEEE Globecom 2004, Dec. 2004.

• C.Y. Jung, J.W. Chong, H.Y. Hwang, D.K. Sung, J.S. Park, “Performance Comparison of ATM and IP Based Transmission Schemes in the UTRAN,” IEEE WCNC 2004, March 2004. 

• J.W. Chong, J.H. Chung, H.Y. Hwang, D.K. Sung, “QoS-Based AAL2/ATM Multiplexing Schemes in the UTRAN Iub Interface,” PIMRC 2003, Sep. 2003. 

• J.A. Jun, S.H. Byun, B.J. Ahn, S.Y. Nam, and D.K. Sung, “A Two-dimensional Scalable Crossbar Matrix Switch Architecture,” IEEE ICC 2003, May 2003.

• Sunggon Kim, Ju Yong Lee, Dan Keun Sung, “Impact of Skewness in Long-Range Dependent Traffic,” APCC 2002, pp.594-597, Sep. 2002. 

• T.J. Kwon, S. Kim, D.K. Sung, “Packet Merging Effect on a Data Collection Routing Tree,” APCC 2002, pp.258-261, Sep. 2002.

• J.A. Jun, S.H. Byun, B.J. Ahn, S.Y. Nam, D.K. Sung, “Two-Dimensional Crossbar Matrix Switch Architecture,” APCC 2002, pp.411-415, Sep. 2002.

• S.Y. Nam, D.K. Sung, “Desynchronized Two-Dimensional Round-Robin Scheduler for Input Buffered Switches,” APCC 2002, pp.438-441, Sep. 2002.

•  J.A. Jun, S.H. Byun, B.J. Ahn, D.K. Sung, “Scalable Crossbar Matrix Switch Architecture Scheduled by Hierarchical Arbitration,” COIN 2002, July 2002.

• K.S. Sohn, D.K. Sung, “A Distributed LSP Mechanism to Reduce Spare Bandwidth in MPLS Networks,” ICC 2002, pp.1189-1193, May 2002.

• J.Y. Lee, S. Kim, D. Kim, D.K. Sung, “Bandwidth Allocation for Delay and Loss Requirements of Internet Traffic in GPS Multiplexer Systems,” ICACT 2002, 2002.

• S.Y. Nam, D.K. Sung, “Decomposed Crossbar Switches with Multiple Input and Output Buffers,” IEEE Globecom 2001, Vol. 4, pp.2661-2665, Nov. 2001. 

• W.Y. Park, J.H. Chung, D.K. Sung, “AAL 2/5 Link Transmission Schemes for Real-Time Voice and Non-Realtime Packets,” CDMA Int. Conference 2001, Nov. 2001.

• S.Y. Nam, K.S. Sohn, D.K. Sung, “Quasi-Shared Output Buffer Switch,” APCC 2001, pp.85-88, Sep. 2001.

• J.Y. Lee, S.S. Park, and D.K. Sung, “Bandwidth Allocation for Delay and Loss requirements in Fair Queueing Systems,” APCC 2001, pp.13-16, Sep. 2001.

• S.H. Kang, Y.H. Kim, D.K. Sung, “Markovian Arrival Process (MAP) Modeling for Superposed Packet Streams,” PV2001 Conference, 2001.

• S.Y. Nam, D.K. Sung, “Measurement Based Delay Performance Estimation in ATM Networks,” Globecom 2000, pp.1766-1770, Nov. 2000.

• K.S. Shon, D.K. Sung, “A Fast and Efficient Buffer Sharing Scheme for an Input Buffer ATM Switch,” Asia Infocom Council, pp.62.1-62.12, Nov. 2000.

• J.W. Heo, D.K. Sung, “A New Fast Cell Resequence Mechanism for Multipath ATM Switches,” IEEE ICC'99, May 1999.

• J.H. Kim, Y.W. Kim, S.W. Park, D.K. Sung, “A Power Control Structure for Multimedia Traffic,” IEEE VTC'99, pp.1525-1529, 1999.

• J.A. Jun, S.M. Lee, H. Kang, D.K. Sung, “Operation and Maintenance (OAM) Scenarios for Point-to-Multipoint ATM Connections,” The 13th Int. Conference on Information Networking, 11A1.1-1.5, 1999.

• J.W. Heo, D.K. Sung, “A Switch Architecture with Quasi-Shared Buffering for Scalable Multicast ATM Switches,” The 13th Int. Conference on Information Networking, 1C1.1-1.6, 1999.

• S.Y. Nam, J.Y. Lee, D.K. Sung, S.J. Lee, “Delay Estimation through Monitoring the Address Buffers of a Shared Buffer Type ATM Switch,” The 13th Int. Conference on Information Networking. (ICOIN 13), pp. 1C2.1-2.6, 1999.

• J.U. You, M.Y. Chung, D.K. Sung, “An Approximation Method for Sojourn Time Distributions in Telecommunication Networks,” IEEE ICC'98, pp.1473-1477, June 1998.

• E.S. Bae, M.Y. Chung, D.K. Sung, “Fixed Local Anchor Scheme for Supporting UPT Services in Wired Networks,” IEEE ICC'98, pp.812-816, June 1998.

• H.J. Kim, D.K. Sung, “Photonic ATM Switch Architecture with an Arrayed Waveguide Grating Router,” Int. Conf. on Telecommunication Systems, pp.387-393, 1998.

• S.H. Byun, D.K. Sung, “A General Expansion Architecture for Large-Scale Multicast ATM Switches,” IEEE Globecom '97, pp.247-251, Nov. 1997.

• Y.W Chung, M.Y. Chung, D.K. Sung, “Performance Evaluation of Advanced Intelligent Networks Supporting Mobile Communications,” IEEE Globecom '97, pp.150-154, Nov. 1997.

• G.Y, Yi, D.K. Sung, “Multichannel Routing Network and Contention Resolution Method,” APCC'97, pp.317-321, 1997.

• S.H. Kang and D.K. Sung, “Real-Time Cell Loss Estimation for ATM Multiplexes with Heterogeneous On/Off Sources,” ICC'97, pp.1679-1683, June 1997.

• S.H. Kang, C. Oh, C.M. Han and D.K. Sung, “Performance Analysis of a High-Speed ATM Switch with Multiple Separated Common Memories,” 15th Int. Teletraffic Congress, 1997.

• H.J. Kim, D.K. Sung, “A Modular Architecture of Large - Capacity ATM Multicast Switch Using Passive Star Coupler,” Int. Conf. on Telecommunications, Melbourne, pp.303-308, 1997.

• J.U. Yoo, M.Y. Chung,T.S. Kim, D.K. Sung, B.D. Choi, K.S. Song, “Development of a SS7 Simulator and Its Applications,” 7th int. Networking Planning Symposium (NPS’96), pp.95-100, Nov. 1996.

• S.H. Kang, C. Oh, D.K. Sung, “A High Speed ATM Switch with Common Parallel Buffers,” IEEE Globecom ’95, Nov. 1995.

• S.H. Kang, D.K. Sung, “Two-State MMPP Modeling of the ATM Multiplexed Traffic Streams Based on the Interarrival Time Processes,” IEEE Globecom ‘95, pp.1422-1426, Nov. 1995.

• J.J. Shin, J.K. Kim, D.K. Sung, “Characterization and Modeling of Variable Bit Rate Video Traffic Sources as Autoregressive Markov Vector Processes,” IEEE Globecom '95, pp.1427-1431, Nov. 1995

• M.Y. Chung, J.U. Yoo, D.K. Sung, B.D. Choi, and J.Y. Park, “Performability Evaluation of Common Channel Signaling Networks,” APCC 1995, 1995.

• M.Y. Chung, D.K. Sung, “Performance Evaluation of Intelligent Networks Accommodating Various IN Services as well as Basic ISDN Services,” Int. Conf. on Computer Communications '95, Serial 2, 1995.

• S.H. Byun and D.K. Sung, “A UniMIN Switch Architecture with Shared Output Buffer Type Interconnection Modules,” JC-CNSS 1994, pp.263-267, 1994.

• S.H. Byun, D.K. Sung, “A Universal Multistage Interconnection Network for Large Scale ATM Switches,” IEEE Globecom '93, pp.19-23, Nov. 1993. 

• S.H. Kang, D.K. Sung, “Reliability and Performance Analysis of Satellite On-board Time-Space-Time Switching Networks with Multiple Separated Space Switches,” 6th JC-CNSS, pp.232-236, 1993.

• S.H. Byun and D.K. Sung, “A UniMIN Switch Architecture with Shared Output Buffer Type Interconnection Modules,” 6th JC-CNSS, pp.263-267, 1993.

• Y.I .Seo, D.K. Sung, “A Performance Analysis of DQDB Protocol in B-ISDN Subscriber Access Networks,” 1993 Asia Pacific Conference on Communications, vol. 2, pp.733-737, 1993.

• S.K. Roh, K.H. Kook, H. Lee, M.Y. Chung, and D.K. Sung, “A Time Slot Searching Mechanism to Improve the Performance of Mult-rate Circuit Switching Systems,”  Joint Conference on Communications, Networks, Switching Systems and Satellite Communications 1992, pp. 215-219, 1992.

• S.H. Kang and D.K. Sung, “An ATM Connection Admission Control Scheme Based on a Multilayer Perceptron Neural Estimator,” Joint Conference on Communications, Networks, Switching Systems and Satellite Communications 1992, pp. 20-24, 1992.

• S.K. Roh, K.H. Kook, and D.K. Sung, “Performance of a Rearrangement Mechanism in Multi-Rate Circuit Switching System,” International Switching Symposium 1992, pp. 326-333, 1992.

• M.Y. Chung, S.Y. Oh, and D.K. Sung, “Traffic Characteristics of Time Slot Allocation Methods with Time Slot Sequence Integrity for nX64 Kb/s Multi-Slot Connection Calls,” International Teletraffic Congress 1991, pp. 105-110, 1991.

• S.H. kang and D.K. Sung, “Reliability and Performance Analysis of Time-Space-Time Swiching Networks with Multiple Separated Space Switches,” International Teletraffic Congress 1991, pp. 111-116, 1991.

• D.K. Sung, “Computational Algorithms of Blocking Probabilities in the Multislot Connection Traffic and Their Applications,” ICCS 1988, 1998.

(3)  Patents

•  J.A. Jun, S.H. Byun, B.J. Ahn,, S.Y. Nam, D.K. Sung, “Method and Apparatus for Two-Dimensional Scalable Crossbar Matrix Switch,” US7522527, USA, (US 10/663,476, Sep. 15, 2003), April 21, 2009. 

• D.K. Sung, S.Y. Nam, “Fast Convolution Approximation Method and System Apparatus for End-to-End Delay Prediction, (단-대-단 지연 예측을 위한 고속 콘볼루션 근사화 시스템 및 그 방법),” JP3856643B2, Japan, (JP2000397873A, Dec. 27, 2000), Dec. 13, 2006.

• D.K. Sung, S.Y. Nam, “A Fast Convolution Approximation Scheme for Estimation of End-to-End Delay,” JP3856643, Japan, Sep. 22, 2006. 

• D.K. Sung, C.Y. Jung, H.Y. Hwang, J.W. Chong, “AAL2 ATM/Packet Link Multiplexing Schemes and Devices Guaranteeing the Delay Requirements of Various Services (다양한 서비스의 지연요구조건을 보장하는 ＡＡＬ2 ＡＴＭ전송장치 및 방법과 그를 이용한 패킷 전송방법),” KR10-0523482, Korea, (1020030008098 (2003.02.10)), Oct. 17, 2005.

• J.A. Jun, S.H. Byun, B.J. Ahn, S.Y. Nam, D.K. Sung, “Scalable Crossbar Matrix Switch and Arbitration Method Thereof (확장형 크로스바 매트릭스 스위치 및 중재 방법),” KR10-0508635, Korea, (1020030013079 (2003.03.03)), Aug. 8, 2005. 

•  D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An ATM Switch and a Method for Determining Buffer Threshold,” DE19824799 B4, Germany, (DE1998124799, June 3, 1998), Jan. 27, 2005.  

• D.K. Sung, S.H. Moon, S.J. Kim, “Variable-Length Packet Scheduling Algorithm and Cross-Point Control Scheme in Input Buffer Switches without Packet Reassembly Buffers (패킷 재조립 버퍼가 필요없는 입력 버퍼형 스위치의 인터넷 패킷 단위 스케쥴링 방법 및 접점 설정 제어방법),” KR10-0452620, Korea, (1020010059832 (2001.09.27)) Oct. 4, 2004. 

• D.K. Sung, S.Y. Nam, “Partitioned Crossbar Switch with Multiple Input/Output Buffers (다중 입출력 버퍼를 둔 분할형 크로스바 스위치),” KR10-0404376, Korea, (1020010084875 (2001.12.26)), Oct. 23, 2003. 

• D.K. Sung, J.W. Heo, “Asynchronous Transfer Mode Switch and Cell Format (대용량화가 가능한 대중 경로 비동기 전송 모드 스위치 및 셀 구조),” KR10-0378588, Korea, (1019990017946 (1999.05.19)), Mar. 20, 2003. 

• D.K. Sung, J.W. Heo, “Quasi-Shared Buffering Type Multicast ATM Switch Module Architecture with Two QoS Classes (두가지 ＱｏＳ 클래스를 지원하는 준 공유 버퍼방식 멀티캐스트 ＡＴＭ 스위치소자 구조),” KR10-0372231, Korea, (1020000031120 (2000.06.07)), Feb. 3, 2003. 

• D.K. Sung, S.Y. Nam, “A Fast Convolution Approximation Scheme for Estimating End-to-End Delay (단-대-단 지연 예측을 위한 고속 콘볼루션 근사화 시스템 및 그 방법),” KR10-0342434, Korea, (1020000056784 (2000.09.27)), June 17, 2002. 

• D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An ATM Switch and a Method for Determining Buffer Threshold,” US6,388,993, USA, (US 09/095,744, June 11, 1998), May 14, 2002. 

• D.K. Sung, J.H. Chung, W.Y. Park, E.M. Chu, “Apparatus and Method for AAL2 ATM Transferring about Heterogeneous Traffic Group (이종 트래픽군에 대한 에이에이엘2 에이티엠 전송 장치 및 방법),” KR10-0334320, Korea, (1020000047616 (2000.08.17)), April 15, 2002. 

•  D.K. Sung, J.H. Chung, W.Y. Park, E.M. Chu “Apparatus and Method of Cell Generation in AAL2 Asynchronous Mode) (에이에이엘 2 에이티엠 셀 생성 장치 및 방법), " KR10-0334319, Korea, (1020000047618 (2000.08.17)), April 15, 2002.

• D.K. Sung, J.H. Chung, W.Y. Park, “Apparatus and Method for AAL2 ATM transferring (에이에이엘2 에이티엠 전송 장치 및 방법),” KR10-0334318, Korea, (1020000047616 (2000.08.17)), April 15, 2002. 

•  D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An ATM Switch Input Tolerance Setting Method,” JP3255883B2, Japan, (JP16315898A, June 11, 1998), Feb. 12, 2002. 

• B.H. Chung, T.H. Lee, K.S. Song, D.K. Sung, B.D. Choi, J.M. Chung, S.H. Choi, “Method for Analyzing Capacity of Common Channel Signaling Network (공통선 신호망에서의 단대단 성능분석방법),” KR10-0317707, Korea, (10-1998-0062049, (1998.12.30), Dec. 4, 2001. 

• B.H. Chung, T.H. lee, K.S. Song, D.K. Sung, B.D. Choi, M.Y. Chung, J.U. Yu, “Common Channel Signaling Network Simulator (공통선 신호망 시뮬레이터 시스템),” KR10-317706, Korea, (1019980055260 (1998.12.16)), Dec. 4, 2001. 

•  D.K. Sung, J.W. Heo, S.H. Byun, J.W. Yang, J.J. Shin, K.K. Lee, “ATM Switch and a Method for Determining Buffer Threshold,” JP3255883, Japan, Nov. 30, 2001. 

• D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An Input Buffer Controller Utilizing Back Pressure Signals in ATM Switches and a Method for Determining the Logical Queue Depth,” US6,259,698 B1, USA, (US 09/095,727, June 11, 1998), July 10, 2001. 

• D.K. Sung, J.W. Heo, S.H. Byun, J.W. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “Input Buffer Control Device and Logical Buffer Size Determination Method for ATM Switch System,” JP3150941, Japan, (JP16331998A, June 11, 1998), March 26, 2001. 

• D.K. Sung, S.H. Kang, “Traffic Monitoring System Using Virtual Buffer in ATM Multiplexer (비동기식 전송모드 다중화기에서 가상버퍼를 이용한 트래픽 관측 시스템),” KR10-0265383, Korea, (1019970048368 (1997.09.24)), June 13, 2000. 

• J.W. Heo, S.H. Byun, J.Y. Lee, J. Yang, J.J. Shin, K.G. Lee, D.K. Sung, “Apparatus and Method for Controlling Logical Queue Depth,” GB2328593, United Kingdom, (19980012553, 1998.6.11), March 15, 2000. 

• D.K. Sung, K.H. Lee, S.J. Lee, T.W. Kim, J.W. Heo, S.H. Byun, J.Y. Lee, “Idle Address Controller for a Shared Buffer Type ATM Switch,” US6,023,469, U.S.A., (US 08/874,822, June 13, 1997), Feb. 8, 2000. 

•  D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An ATM Switch and a Method for Determining Buffer Threshold (ATM 스위칭 시스템의 단일 스위치 소자 및 버퍼 문턱값 결정 방법),” KR10-0247022, Korea, (10-1997-0024144, 1997.6.11), Dec. 9, 1999. 

• D.K. Sung, J.Y. Lee, K.H. Lee, S.J. Lee, T.W. Kim, “Device for Measuring Cell Loss Probability in Asynchronous Transfer Mode (비동기 전송 모드에서 셀손실 확률 측정 장치),” KR10-0243667, Korea, (1019970069723 (1997.12.17)), Nov. 17, 1999. 

•  D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An Input Buffer Controller Using Back-Pressure Signals in ATM Switches and A Method for Determining the Logical Queue Depth (ATM 스위치에서 셀 손실율 개선을 위한 역방향압력 신호를 이용한 입력 버퍼 제어기 장치 및 논리버퍼 크기 결정알고리즘),” AU712478B2, Australia, (AU69811/98A, May 29, 1998), Nov. 11, 1999.

•  D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An Input Buffer Controller and Logical Buffer Size Decision Algorithm (ATM 스위치에서 셀 손실율 개선을 위한 역방향압력 신호를 이용한 입력 버퍼 제어기 장치 및 논리버퍼 크기 결정알고리즘),” KR216368, Korea, (10-1997-0024145, 1997.6.11), May 28, 1999. 

• D.K. Sung, K.H. Lee, S.J. Lee, T.W. Kim, J.W. Heo, S.H. Byun, J.Y. Lee, “ATM Switch Address Controlling Apparatus (공유버퍼형 ATM 스위치에서의 휴지주소 제어장치),” KR10-0 194590, Korea, (1019960047442 (1996.10.22)), Feb. 10, 1999. 

• D.K. Sung, J.W. Heo, S.H. Byun, J.U. Yang, J.Y. Lee, J.J. Shin, K.K. Lee, “An ATM Switch and a Method for Determining Buffer Threshold,” DE19824799 A1, Germany, (DE1998124799, June 3, 1998), Dec. 24, 1998. 

•  S.H. Byun, D.K. Sung, “Large Scale ATM Switching System ((대용량화에 적합한 비동기 전송모드 스위칭 시스템),” KR10-0150622, Korea, (1019940040606 (1994.12.31)), June 15, 1998. 

• D.K. Sung, S.H. Byun, J.W. Heo, H.S. Park, “Multi-Stage Connected ATM Concentration and Expander (다단접속 에이티엠 집선장치 및 확선장치)s,” KR10-0147343, Korea, (10-1995-0032133 (1995.09.27)), May 16, 1998. 

• S.H. Byun, J.W. Heo, D.K. Kim, S.J. Lee, D.K. Sung, “Device for Controlling Broadcasting in Asynchronous Transfer Mode (ATM) Switch of Shared Buffer Type (공유버퍼형 에이티엠 스위치에서의 방송제어 장치),” KR10-0146763, Korea, (1019950025320 (1995.08.17)), May 13, 1998. 

• D.K. Kim, S.K. Chang, D.K. Sung, Y.B. Lee, M.Y. Chung, “Real-Time Traffic Generation Method (실시간 트래픽 발생 방법),” KR10-0123062, Korea, 10-1994-0028029 (1994.10.28)), Sep. 10, 1997. 

• S.K. Roh, J.S. Lee, D.K. Sung, “Multi-Slot Calling Method for Time-Space-Time Type Switching Network (단일버퍼 구성의 시간-공간-시간형 교환망에서의 다중 슬롯호 수용방법),” KR10-0116031 , Korea, (10-1993-0028944, (1993.12.21 ) ), June 5, 1997.

• D.K. Sung, S.H. Kang, “Satellite On-Board Time-Space-Time Switching Network (위성탐재 시간-공간-시간형 교환망)", KR10-0102376, Korea, (1019920019052 (1992.10.16)), July 22, 1996. 

• S.K. Roh, K.H. Kook, D.K. Sung, J.S. Lee, “Multi-slot Call Rearrangement Method in Time-Space-Time Switching Network (시간-공간-시간 교환망에서 다중 슬롯호 재배열 방법),” KR10-0096222, Korea, (1019920019674 (1992.10.24)), Feb. 27, 1996. 

•  S.K. Roh, K.H. Kook, D.K. Sung, J.S. Lee “Method for Processing Multislot Call of T-S-T Type Switching Network (T-S-T 형 스위칭 네트워크의 다중슬롯호 수용방법)", KR10-0068852, Korea, (1019910008590 (1991.05.25) Dec. 18,1993. 

(4)  Book/Book Chapter in ATM Networks

•  C.H.Yim, D.K.Sung, C.M.Han, Y.S.Kim, ATM Switching, 1996.

•  S.H. Byun and D.K. Sung, “A General Expansion Architecture for Large-Scale Multicast ATM Switches,” High Performance Backbone Network Technology, edited by Naoaki Yamanaka, published 2004 by Marcel Dekker, Inc.

      (5) Major Research Projects

• • ¨Performance Evaluation of Packet Switches for IP & TDM Traffic, 2003

  • ¨QoS Assurance Schemes in High Performance Routers, 2003

  • ¨Performance Evaluation of an ATM/MPLS System, 2001-2002.

  • ¨Performance Evaluation of a Multiservice Switch, 2000-2001.

  • ¨Study on the Next-Generation Multi-Service Switch Architecture, 2001.

  • ¨Development of an Arbitrator Chip for High Speed Packet Switches, 2000-2002.

  • ¨Performance Evaluation of the ACE 2000 ATM Switching System, 2000.

  • ¨Multiplexing Scheme of Voice and Data Traffic in Transmission Links, 2000.

  • ¨Next Generation Multicast ATM Switch, 1999-2002.

  • ¨Non-Realtime Traffic Control in HANBIT ACE Switching System, 1999.

  • ¨Broadcast Service Technologies in Communication Networks, 1999.

  • ¨Multicast ATM Switch, 1997-1999.

  • ¨Measurement-Based Traffic Control of a Shared Buffer Type ATM Switch, 1998.

  • ¨Measurement-Based ATM Traffic Control, 1997.

  • ¨Basic Studies on B-ISDN Core Technologies, 1995-1997.

  • ¨Development of an ATM LAN Switch Simulator, 1996.

  • ¨Development of a CCS No. 7 Signaling System Simulator, 1994-1997

  • ¨Development of an ATM Switch Simulator, 1994-1996.

  • ¨Study on Advanced Intelligent Network(AIN) based Mobile Switching Center, 1996.

  • ¨Study on a Real-time ATM Traffic Generator, 1993.

  • ¨Study on Usage Parameter Control, 1992, etc.