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Seoul National University (17 results)
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- Bit and Power Allocation for MIMO-OFDM Systems With Spatial Mode Selection Over Frequency- Space- Time- Selective Channels
- Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system is known to reduce the negative impact of the time dispersive characteristic of channels and show high spectral efficiency. Various spatial modes, such as multiplexing and diversity, can be used to improve the spectral efficiency further. This paper proposes the...
- White papers 2004-10-04
- Raptor Code-Based Video Multicast Over IEEE 802.11 WLAN
- This paper applies a Raptor code-based forward error correcting scheme right above the Medium Access Control MAC layer in order to ensure the reliability of the video multicast over IEEE 802.11 Wireless LANs WLANs. Both Raptor code rate and PHYsical layer PHY transmission rate are dynamically adapted according to the...
- White papers 2008-06-30
- The Seoul National University of Technology Deploys DX 3600 to Ensure Peak Availability
- During peak periods such as entrance examinations and class registration, the Seoul National University of Technology SNUT's network was often overwhelmed by a sharp increase in traffic. The congestion worsened as deadlines drew near, threatening to bring down the university's three Web application servers. SNUT also introduced a new admission...
- Case studies 2007-12-01
- Minimizing Overhead in Implicit Locking for Object-Oriented Databases
- Object-Oriented Databases OODBs have been adopted for many advanced database applications such as artificial intelligence and computer-aided design. In this paper, a locking-based concurrency control scheme for OODBs is presented. The proposed scheme is based on so called the implicit locking and incurs less locking overhead than the implicit locking...
- White papers 2008-01-01
- Novell Case Study: Seoul National University
- Seoul National University SNU is South Korea's premier and largest national university, as well as a leading research center, with more than 30,000 students and 1,700 full-time faculty and 1,400 staff members. SNU is striving to become South Korea's hub for grid computing, taking advantage of networked computers to handle...
- Case studies
- Java-Based Programmable Networked Embedded System Architecture With Multiple Application Support
- This paper addresses the problem of designing embedded system architecture for emerging information appliances such as PDAs and IMT2000 terminals. These systems are characterized by multiple-application support and network connectivity. Programmable architecture is an efficient way of implementing the multiple-application support. This paper proposes an FPGA-based embedded system architecture using...
- White papers
- TCP Dynamics Over IEEE 802.11e WLANs: Modeling and Throughput Enhancement
- Today, IEEE 802.11 Wireless LAN WLAN has become a prevailing solution for broadband wireless Internet access while Transport Control Protocol TCP is the dominant transport protocol in the Internet. It is known that, in an infrastructure-based WLAN with multiple stations carrying long-lived TCP flows, the number of stations that are...
- White papers 2007-07-11
- TCP-Vegas Slow Start Performance in Large Bandwidth Delay Network
- With the rapid expansion of the Internet, it has become possible for end hosts that are separated long apart to be connected through high bandwidth links. This environment, called a Large Bandwidth Delay Network, poses a major challenge to the performance of the Internet. A long-delay connection usually suffers from...
- White papers 2007-01-01
- A Cross-Layer Approach for Per-Station Fairness in TCP Over WLANs
- This paper investigates the issue of per-station fairness in TCP over IEEE 802.11-compliant Wireless Local Area Networks WLANs, especially in Wi-Fi hot spot. It is asserted that the hot spot suffers from the unfairness among stations in exploiting the wireless medium. The source of this unfairness is analyzed from two...
- White papers 2007-06-16
- Modeling and Analysis of TCP Dynamics Over IEEE 802.11 WLAN
- Today, IEEE 802.11 Wireless LAN WLAN is a prevailing solution for the wireless Internet access while Transport Control Protocol TCP is the dominant transport protocol in the Internet. It is known that, in the infrastructure WLAN with multiple long-lived TCP flow stations, the actual number of contending TCP stations is...
- White papers 2006-12-01
- A Seamless Handover Mechanism for IEEE 802.16e Broadband Wireless Access
- Handover is one of the most important factors that may degrade the performance of TCP connections and real-time applications in wireless data networks. This paper developed a loss-free handover scheme called LPM Last Packet Marking for IEEE 802.16e-based broadband wireless access networks. By integrating MAC and network layer handovers efficiently,...
- White papers 2005-02-28
- IEEE 802.11h: Technology and Application
- This paper focuses on the 802.11h specification for spectrum and transmit power management. The paper overviews the two new mechanisms the 802.11h defines on top of the 802.11 MAC and the 802.11a PHY [8], namely, DFS Dynamic Frequency Selection and TPC Transmit Power Control, and then describe an example DFS...
- White papers 2004-09-21
- Throughput Enhancement of IEEE 802.11 WLAN Via Frame Aggregation
- The popular IEEE 802.11 WLAN is known to achieve relatively small throughput performance compared to the underlying PHYsical layer PHY transmission rate. This is due mainly to the large overheads composed of Medium Access Control MAC header, PHY preamble/header, backoff time, ACKnowledgement ACK transmission, and some Inter-Frame Spaces IFSs. Since...
- White papers 2004-07-07
- Adaptive Token Bucket Algorithm for Fair Bandwidth Allocation in DiffServ Networks
- This paper proposes an adaptive token bucket algorithm for achieving proportional sharing of bandwidth among aggregate flows in Differentiated Service DiffServ networks. By observing the simulation results obtained in a study of the throughput of TCP flows in a DiffServ network, the paper notes that the aggregate flow with a...
- White papers 2007-01-01
- Comparison of Modified Dual Queue and EDCA for VoIP Over IEEE 802.11 WLAN
- The popular IEEE 802.11 WLAN today does not provide any Quality-of-Service QoS because of its contention-based channel access nature of the Medium Access Control MAC. Therefore, this paper proposes a simple software upgrade-based solution, called a dual queue scheme, to provide QoS to real-time services such as Voice-over-IP VoIP in...
- White papers 2006-03-20
- A Constrained Multipath Traffic Engineering Scheme for MPLS Networks
- A traffic engineering problem consists of setting up paths between the edge nodes of the network to meet traffic demands while optimizing the network performance. It is known that total traffic throughput in a network, hence the resource utilization, can be maximized if the traffic demand is split over multiple...
- White papers 2008-01-01
- A Study on Representing Collaborative Web Design Project Process as Shared Reminder
- The features of current Web Design Project WDPs are so complex and long lasting that projects need effective collaboration. For this reason, Intranet/groupware/extranet is used for managing some projects. Practically, this can not be common ground for collaboration because it isn't designed for process management. Even though firms may have...
- White papers 2007-08-30
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