seoul national university

ZDNet Resources

• sort by:
• Relevance
• Date
• Popularity

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...

Tags: Seoul National University, WLAN, TCP, IEEE, Modeling, Wireless LANs, LANs, Wi-Fi, Wireless, Networking

White papers 2007-07-11

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...

Tags: Seoul National University, Hot Spot, WLAN, TCP, Tcp/Ip, Wireless LANs, LANs, Networking, Wi-Fi, Wireless

White papers 2007-06-16

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...

Tags: Bandwidth, Seoul National University, Performance, Network, Buffer, Connection, TCP-Vegas, Internet, Performance Management, Human Resources, Workforce Management

White papers 2007-01-01

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...

Tags: Algorithm, Bandwidth, Seoul National University, Allocation, Engineering, Tcp/Ip, Networking

White papers 2007-01-01

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...

Tags: IEEE 802.11, Seoul National University, Station, WLAN, TCP, Analysis, Modeling, Wireless LANs, LANs, Wi-Fi, Wireless, Internet, Networking

White papers 2006-12-01

Nortel Network Case Study: Seoul National University (SNU)

SNU was established in 1946 to become the first national university in modern Korean history. The company wanted high performance networking infrastructure to PEGASUS's cluster-type architecture, the SNU research team took on the hunt for the right supplier - their search led them to Nortel and its enterprise networking portfolio....

Tags: Seoul National University, Network, Nortel Networks Corp., High-performance, Leadership, Networking, Management

Case studies 2006-06-29

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...

Tags: Contention, IEEE 802.11, Seoul National University, QoS, MAC, Telephony, Wireless LANs, VOIP, Telecommunications, Networking, Wireless

White papers 2006-03-20

A Novel ARQ Strategy for Wireless Mobile IP Network

In recent years, the broadband Internet experience drives the demand for the high-speed wireless access to the IP network everywhere even in mobile environments. In order to respond to such a fashion, new wireless systems are emerging. Automatic Repeat reQuest ARQ is one of the effective techniques against the transmission...

Tags: Seoul National University, QoS, MAC, Network, IP Network, Wi-Fi, Wireless, Telecommunications, Networking

White papers 2005-03-11

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,...

Tags: Seoul National University, Network, Broadband Wireless, Broadband, TCP, IEEE, Wireless Access, Handover, Tcp/Ip, Broadband Internet, Telecommunications, Wireless, Networking

White papers 2005-02-28

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...

Tags: Seoul National University, Allocation, MIMO-OFDM

White papers 2004-10-04

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...

Tags: IEEE 802.11, Seoul National University, IEEE, Wireless LANs, Wi-Fi, Wireless

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...

Tags: IEEE 802.11, Seoul National University, Aggregation, Transmission, IEEE 802.11 WLAN, Wireless LANs, Wi-Fi, Wireless

White papers 2004-07-07

Game Transport Protocol: A Reliable Lightweight Transport Protocol for Massively Multiplayer On-Line Games (MMPOGs)

With the advent of high-speed access network technologies such as ADSL, increasing numbers of Internet users are participating in various interactive multimedia applications. Among these, the most popular are the massively interactive on-line games, or MMPOGs. In MMPOGs, a large amount of event data is associated with various control objects....

Tags: Seoul National University, Event Data, Games, Internet, Tcp/Ip, Networking, Personal Technology

White papers 2002-07-07

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...

Tags: Novell Inc., Seoul National University, Grid Computing, Utility Computing, It Management, Network Technology, Open Source, Servers, It service Management, Networking, Hardware

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...

Tags: Seoul National University, Embedded System, FPGA, Architecture, Programming Languages, Java, Software Development, Software/Web Development

White papers

Additional Resources

The future of tech IPOs

At the AlwaysOn Summit at Stanford University, Frank Quattrone, co-founder of Qatalyst, talks about the dismal condition of the current IPO market, why venture capitalist backed companies are not going public right now, and what the future holds.

Tags: IPO, Financial Planning, Investment, Venture Capital, Financial Services, Finance, Financing Startups, Tech IPOs

Videos 2008-07-25

10 essential gadgets for students

I chose these from personal experience, but also from asking many friends from around the world who are involved in technology and study at the same time. Some gadgets come with a recommendation, whereas others don't; things like laptops and cell phones can't be selected for everybody, it'd be ridiculous...

Tags: Headphone, Phone, Cell Phone, Laptop Computer, Lecture, Notebooks, Telecom & Utilities, Hardware, Notebooks & Tablets, Zack Whittaker

Blog posts 2008-07-25

10 essential gadgets for students

Showing you some of the gadgets college and university students really shouldn't live without. by Zack Whittaker

Tags: Student, Zack Whittaker, Gadgets, University, Pen drive, Cell phone, Laptop, Computer

Image galleries 2008-07-25

Government, markets and regulation

Government, markets and regulationJust Another Gov't Program Gone BadFannie Mae was created in the Depression to create liquidity in the mortgage market. Lequidity had been wiped out by the stock market collapse and bank runs.As with all government programs, it just grew and grew and never went away. ...

Tags: Mortgages, Vertical industries, Fannie Mae, Freddie Mac, mortgage, government

Discussion threads 2008-07-24

Is open source hurt by piracy?

Is open source hurt by piracy?Only hurts Open Source if proprietary is seen as "better"Sounds like what you are saying is for example, that the competition in the office suite space is Open Office Vs MS Office Vs pirated MS Office. Those willing to pirate see both Open Office...

Tags: Operating systems, open source, piracy, OpenOffice, Microsoft Office, Microsoft Corp., Linux, software

Discussion threads 2008-07-24