Selected Publications on Mobile Computing

Infrastructure-based MANETs and Vehicular Ad Hoc Networks
Internet-based vehicular ad hoc network (IVANET) is an emerging technique that combines a wired Internet and a vehicular ad hoc network (VANET) for developing a next generation of ubiquitous communication infrastructure and improving universal information and service accessibility. Dr. Yu works on several optimization techniques in IVANET as well as infratructure-based MANETs (IMANETs) such as data caching/invalidation.
  1. S. Lim, S. H. Chae, C. Yu, C. R. Das, “On Cache Invalidation for Internet-based Vehicular Ad Hoc Networks,” Int’l Workshop on Mobile Vehicular Networks (MoVeNet), 2008.
  2. R. Chokshi and C. Yu, "Study on VLAN in Wireless Networks," April 30, 2007.
  3. S. Mehra and C. Yu, "Enhancing the Performance of Mobile Ad Hoc Networks with the Aid of Internet Gateways," International Conference on Wireless Networks (ICWN'04), Vol. I, pp. 22-26, 2004.
  4. Shiv Mehra and C. Yu, "Survey on Techniques providing Internet Connectivity to Mobile Ad Hoc Networks, " MCRL, ECE, CSU, 2003.
  5. T. Master and C. Yu, "Wireless Repeater," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Dec. 2003.
  6. H. Sarhan and C. Yu, "IP Anycast in Ad hoc Networks," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Sep. 2002.
Cooperative Communications in Wireless Networks
As large-scale, high-density multi-hop network is desirable in many potential applications there exists a greater demand on scalable MANET architecture.  The challenge is in the limited scalability despite the improved spatial diversity in a large network area: Effective bandwidth allowed per node decreases as network size grows.  This is mainly due to the increased route length between two end nodes in a MANET. Dr. Yu works on capacity and scalability issues in large-scale multi-hop ad hoc networks via cooperation among the nodes.
  1. S. Moh, C. Yu, S.-M. Park, and H.-N. Kim, “CD-MAC: Cooperative Diversity MAC for Robust Communication in Wireless Ad Hoc Networks,” IEEE International Conference on Communications (ICC), 2007 (Acceptance rate: 28%).
  2. L. Song and C. Yu, “Improving Spatial Reuse with Collision-Aware DCF in Mobile Ad Hoc Networks,” 35th International Conference on Parallel Processing (ICPP), pp. 219-226, 2006 (Acceptance rate: 32%).
  3. L. Song and C. Yu, “Minimizing Spatial and Time Reservation with Collision-Aware DCF in Mobile Ad Hoc Networks,” accepted for publication in Ad Hoc Networks Journal (Elsevier), 2008.
  4. C. Yu, K. G. Shin, and L. Song, "Maximizing Communication Concurrency via Link-Layer Packet Salvaging in Mobile Ad Hoc Networks," IEEE Trans. Mobile Computing, Vol 6, No. 4, Apr. 2007.
  5. C. Yu, K. G. Shin, and L. Song, “Link-Layer Salvaging for Making Routing Progress in Mobile Ad Hoc Networks,” The Sixth ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc), 2005 (acceptance ratio 14%).
  6. C. Yu, K. G. Shin, and B. Lee, “Power-Stepped Protocol: Enhancing Spatial Utilization in a Clustered Mobile Ad Hoc Network,” IEEE Journal of Selected Areas in Communications (J-SAC), Vol. 22, No. 7, pp. 1322-1334, Sep. 2004.
  7. M. Lim and C. Yu, "Does Cluster Architecture Enhance Performance Scalability of Clustered Mobile Ad Hoc Networks?" Proceedings of the International Conference on Wireless Networks (ICWN'04), Vol. I, pp. 71-77, 2004.
  8. B. Lee, C. Yu, and S. Moh, "Issues in Scalable Clustered Network Architecture for Mobile Ad Hoc Networks," Handbook of Mobile Computing, CRC Press LLC, 2004.
Research on Mobility and Scale Free Wireless Networks
Mobility is a main source of many challenges in mobile, wireless networks. Dr. Yu has been studying efficient routing and multicasting schemes in the presence of mobility and clustering architecture to counter the effect of mobility as well as new mobility model that induces heterogeneous node distributions based on scale-free network topologies.
  1. S. Moh, S. J. Lee, and C. Yu, “Adaptive Multicast on Mobile Ad Hoc Networks using Tree-Based Meshes with Variable Density of Redundant Paths,” accepted for publication in Wireless Networks (WINET), Springer, 2008.
  2. S. Lim, C. Yu and C. Das, “Clustered Mobility Model for Scale-Free Wireless Networks,” IEEE 31st Conference on Local Computer Networks (LCN), 2006 (Acceptance rate: 33%).
  3. C. Yu, K. G. Shin, B. Lee, S. Park, and H. Kim, “Node Clustering in Mobile Peer-to-Peer Multihop Networks,” IEEE Percom Workshop on Mobile Peer-to-Peer Computing (MP2P’06), pp. 130-134, 2006 (Acceptance rate: 33%).
  4. S. Moh, S. J. Lee, and C. Yu, “Tree-Based Multicast Meshes with Variable Density of Redundant Paths on MANETs: Tradeoffs between Tree and Flooding,” The International Conference on Wireless Algorithms, Systems and Applications (WASA’06), 2006.
  5. C. Yu, C. Das and Y, Pan (editors), "Performance Analysis of Mobile Ad Hoc Networks," Nova Science Publishers Inc, 2006 (ISBN 1-60021-277-8).
  6. C. Yu, S. Park, and H. Kim, “Every Node is Born Equal: Attacking Preferential Attachment in Peer-to-Peer Mobile Multihop Networks” IEEE Percom Workshop on Mobile Peer-to-Peer Computing (MP2P’05), pp. 70-74, 2005.
  7. K. Kalepu, S. Mehra and C. Yu, "Experiment and Evaluation of a Mobile Ad Hoc Network with AODV Routing Protocol," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Oct. 2002.
Uncertainty and Energy Management in Wireless Sensor Networks
The characterization of uncertainty and the management of quality of service are important issues in mobile communications. In a wireless sensor network there is a high probability of redundancy, correlation, and noise in the sensor features since data is often collected from a large array of densely deployed neighboring sensors. Our research agenda is to study a soft computing approach to manage uncertainty by reasoning over inconsistent, incomplete and fragmentary information using dominance-based rough set theories as well as to illustrate its usefulness in a real world sensor network scenario.  Energy management is also a primary research goal in wireless sensor networks.
  1. S. Mal-Sarkar, I. U. Sikder, C. Yu, V. K. Konangi, “Uncertainty-Aware Wireless Sensor Networks,” accepted for publication in International Journal of Mobile Communications (IJMC, Inderscience), 2008.
  2. C. Yu, K. Shin, K. Tatapudi, and S. Kalubandi, "Design and Analysis of Bulk Synchronous Medium Access Protocol," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, August 16, 2006.
  3. Kiran Tatapudi and Chansu Yu, "SMAC Implementation for ETRI SSN-based Sensor Networks," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Jan. 31, 2006.
  4. Sridhar Kalubandi and Chansu Yu, “Bulk Synchronous Medium Access (BSMA) for Mote-based Sensor Networks,” MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Jan. 24, 2005.
  5. Sridhar Kalubandi and Chansu Yu, “Power-Aware MAC for Mote-based Sensor Networks,” MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Sep. 17, 2004.
  6. C. Yu, B. Lee, S. Kalubandi and M. Kim, "Medium Access Control Mechanisms in Mobile Ad Hoc Networks," Handbook of Mobile Computing, CRC Press LLC, 2004.
Power Aware Design in Mobile Ad Hoc Networks
Energy conservation is one of the most important issues in designing mobile ad hoc networks.  Dr. Yu has been working on energy efficient routing and multicasting protocols during the last three years.

  1. S. Lim, C. Yu, and C. R. Das, “RandomCast: An Energy Efficient Communication Scheme for Mobile Ad Hoc Networks,” accepted for publication in IEEE Transactions on Mobile Computing.

  2. S. Moh, C. Yu, B. Lee, and H. Y. Youn, “Energy Efficient Two-Tree Multicast for Mobile Ad Hoc Networks,” Advances in Wireless Networks and Mobile Computing, Ed. D.-Z. Du and G. Xue, of book series “Network Theory and Applications,” Springer, 2007.
  3. S. Lim, C. Yu and C. Das, “Rcast: A Randomized Communication Scheme for Improving Energy Efficiency in Mobile Ad Hoc Networks,” The 25th International Conference on Distributed Computing Systems (ICDCS), 2005 (acceptance ratio 14%).
  4. Sridhar Kalubandi and Chansu Yu, “Bulk Synchronous Medium Access (BSMA) for Mote-based Sensor Networks,” MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Jan. 24, 2005.
  5. Sridhar Kalubandi and Chansu Yu, “Power-Aware MAC for Mote-based Sensor Networks,” MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Sep. 17, 2004.
  6. C. Yu, B. Lee, and H. Y. Youn, "Energy Efficient Routing Protocols for Mobile Ad Hoc Networks," Wireless Communications and Mobile Computing (WCMC) Journal, Vol. 3, Issue 8, pp. 959-973, Dec. 2003.
  7. H. Y. Youn, C. Yu, and B. Lee, "Routing Algorithms for Balanced Energy Consumption in Ad Hoc Networks," Chapter 25, Handbook of Ad Hoc Wireless Networks, CRC Press LLC, 2003.
  8. H. Y. Youn, C. Yu, B. Lee, and S. Moh, "Energy Efficient Multicast in Ad Hoc Networks," Chapter 23, Handbook of Ad Hoc Wireless Networks, CRC Press LLC, 2003.
  9. J. H. Lee, H. Y. Youn, C. Yu, and D. Lee, "Efficient Power-aware Hybrid Routing Using Zoning for Ad Hoc Network," ISCA 18th Int'l Conf. on Computers and Their Applications, Mar. 2003.
  10. E. Lee, M. Kim, C. Yu, and M. Kim, "NOAL: Node Alarming Mechanism for Energy Balancing in Mobile Ad hoc Networks," World Multiconference on Systemics, Cybernetics and Informatics (SCI 2002), July, 2002.
  11. S. Moh, C. Yu, B. Lee, and H. Y. Youn, "Energy Efficient and Robust Multicast Protocol for Mobile Ad Hoc Networks," 2002 Pacific Rim International Symposium on Dependable Computing (PRDC 2002).
  12. K. Woo, C. Yu, H. Y. Youn, and B. Lee, "Non-Blocking, Localized Routing Algorithm for Balanced Energy Consumption in Mobile Ad Hoc Networks," Int'l Symp on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS 2001), pp.117-124, 2001.

Multimedia and QoS in Mobile Wireless Networks
Mobile IP will be the prevailing form of mobile networks because it provides Internet connectivity while supproting mobility.  Supporting multimedia data over the Mobile IP networks requires careful investigation of QoS issues in the presence of handoff and tuning of system paramaters for real-time service.

  1. K. Lee, M. Kim, C. Yu, B. Lee and S Hong, "Selective Advance Reservations Based on Host Movement Detection and Resource-aware Handoff," International Journal of Communication Systems, Special Issue on Radio Resource Management for Provisioning IP-Based QoS in Wireless Cellular Networks, Vol. 19, Issue 2, pp. 163-184, Mar. 2006.
  2. E. Nurvitadhi, B. Lee, C. Yu, and M. Kim, "Adaptive Semi-Soft Handoff for Cellular IP Networks," International Journal of Wireless and Mobile Computing, Special Issue "Media Streaming Over Wireless and Mobile Networks, Vol. 1, Issue 4, 2005.
  3. Srinivas Tera, Amit Panchal, Abhijit Kadam, Lubo Song, and Chansu Yu, “Experimental Study of an Ad-hoc Positioning System based on IEEE 802.11-based PDA Network,” MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Oct. 29, 2004.
  4. W. Kim, M. Kim, K. Lee, C. Yu, B. Lee, “Link Layer Assisted Mobility Support Using SIP for Real-time Multimedia Communications,” ACM International Workshop on Mobility Management and Wireless Access (MobiWac 04) in conjunction with Mobicom 2004, Sep. 2004.
  5. K. Lee, M. Kim, S. T. Chanson, C. Yu and J. Lee, "CORP - A Method of Concatenation and Optimization for Resource Reservation Path in Mobile Internet," IEICE Transactions on Communications, Vol. E86-B, No. 2, Feb. 2003.
  6. Soonuk Seol, Myungchul Kim, Chansu Yu, and Jong-Hyun Lee, "Experiments and Analysis of Voice over Mobile IP," The 13th IEEE International Symposium on personal, Indoor and Mobile Radio Communications (PIMRC 2002).
  7. Wonyong Yoon, Dongman Lee, Chansu Yu and Myungchul Kim, "Tree-Based Reliable Multicast in Combined Fixed/Mobile IP Networks ," 25th Annual IEEE Conference on Local Computer Networks (LCN 2000) , pp. 478-487, November 2000.
Energy Aware Mobile Systems
Mobile devices in the form of cell phone, PDA, Palm PC, handheld devices and various embedded devices are fundamental elements in future computing environments.  Based on his experience in developing mobile devices based on MS Windows CE, Dr. Yu has been studying energy efficient MPEG decoding schemes.  His prior research projects during 1998-2001 include Embedded web camera based on ARM processor and Remote system monitoring tool for developing VxWorks-based embedded systems using Tornado.
  1. W. Chedid, C. Yu and B. Lee, "Power Analysis and Optimization Techniques for Energy Efficient Computer Systems," Advances in Computers, Special issue in the area of computer architecture, Vol. 63, Ed. A. R. Hurson and M. V. Zelkowitz, Elsevier Academic Press, pp. 129-164, 2005.
  2. B. Lee, E. Nurvitadhi, R. Dixit, C. Yu, and M. Kim, "Dynamic Voltage Scaling Techniques for Power Efficient Video Decoding," Journal of Systems Architecture, Vol. 41, Issues 10-11, pp. 633-652, Oct.-Nov. 2005.
  3. E. Nurvitadhi, B. Lee, C. Yu, and M. Kim, "A Comparative Study of Dynamic Voltage Scaling Techniques for Low-Power Video Decoding," 2003 International Conference on Embedded Systems and Applications (ESA '03), 2003.
  4. W. Chedid and C. Yu, "Survey on Power Management Techniques for Energy Efficient Computer Systems," MCRL (Mobile Computing Research Lab.), ECE Dept., CSU, Sep. 2002.
  5. Donghwan Son, Chansu Yu and Heung-Nam Kim, "Dynamic Voltage Scaling on MPEG Decoding," International Conference on Parallel And Distributed Systems (ICPADS 2001) , pp. 633-640, 2001.
  6. J. Kang and C. Yu, "Some Memory Management Issues in the Construction of ROM-Based Microkernel Systems," Technical Journal of LG Research, Vol.III, pp.406-413, Nov.1995.
World Wide Web Pages for Mobile Computing Lab. (last update 8/6/08)