chinese university of hong kong

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A Simple Model for Analyzing P2P Streaming Protocols

P2P streaming tries to achieve scalability (like P2P file distribution) and at the same time meet real-time playback requirements. It is a challenging problem still not well understood. This paper describes a simple stochastic model that can be used to compare different data-driven downloading strategies based on two performance metrics:...

Tags: P2P, Chinese University Of Hong Kong, Peer To Peer (P2P), Strategy, Internet, Management

White papers 2007-08-30

Cooperative Protocols for Multiple-Source Multiple-Relay Wireless Networks

This paper studies the cooperative communications in wireless systems with ns source nodes, nr relay nodes, and single destination node. The paper proposes cooperative protocols and analyzes the system performance of the cooperation systems. For ns = 1; nr > 1, the nodes cooperate in a repetition way. The impact...

Tags: Node, Chinese University Of Hong Kong, Wi-Fi, Wireless

White papers 2007-04-02

Balancing Throughput and Fairness for TCP Flows in Multihop Ad-Hoc Networks

Analyzing transport layer operation and enhancing its performance over multihop ad hoc networks have attracted a lot of attentions. Although the fundamental reasons for the performance degradation of TCP have been studied for many years, the tight coupling between transport layer and the wireless MAC layer is still not well...

Tags: Network, TCP, Fairness, Chinese University Of Hong Kong, Optimization Framework, Tcp/Ip, Networking

White papers 2007-02-23

Performance Modeling on the Interaction of ISPs

This paper considers interactions of Internet Service Providers ISPs and how these interactions can affect the overall traffic and resource allocation between ISPs. In particular, the paper considers a simplified two-level hierarchical model wherein there are a single tier-1 ISP and N>1 tier-2 ISPs. Each tier-2 ISP needs to pay...

Tags: Performance, Internet Service Provider, Service Provider, Chinese University Of Hong Kong, Internet Service Providers (ISPs), Business Services, Internet

White papers 2007-01-01

Defending Against Low-Rate TCP Attacks: Dynamic Detection and Protection

This paper considers a distributed approach to detect and to defend against the low-rate TCP attack. The low-rate TCP attack is essentially a periodic short burst which exploits the homogeneity of the minimum Retransmission Time Out RTO of TCP flows and forces all affected TCP flows to back off and...

Tags: TCP, Attack, Chinese University Of Hong Kong, TCP Attack, Tcp/Ip, Networking

White papers 2007-01-01

Analysis of a Distributed Denial-of-Service Attack

DDoS is a growing problem in cyber security. One DDoS defense technique actively studied by researchers is on-line packet attribute analysis followed by selective packet filtering. In order to evaluate the effectiveness of this technique, they have analyzed the packet traffic data collected at the routers in two sites: a...

Tags: Technique, Packet, Distributed Denial Of Service, Analysis, Chinese University Of Hong Kong, Productivity, Security

White papers 2006-12-05

WDM PON for Next-Generation Optical Broadband Access Networks

TDM-PON systems such as BPON and GPON are being deployed in current generation FTTH/FTTP access networks for providing broadband access offering triple play services including video, data and voice. In the near future, it is in general agreed that WDM based access networks will be enabling the next-generation optical broadband...

Tags: Microsoft Access, Network, Broadband, Broadband Access, WDM, Chinese University Of Hong Kong, WDM-PON, Optical Networking, Broadband Internet, Telecommunications, Networking

White papers 2006-06-25

Voice Over Wireless LAN Via IEEE 802.16 Wireless MAN and IEEE 802.11 Wireless Distribution System

IEEE 802.16 Wireless MANs WMAN aims to extend the wireless broadband access up to kilometers to facilitate the long-range 'last-mile' Solution. For short-range extension, IEEE 802.11 Wireless Distribution System WDS can be set up easily by connecting Access Points AP together to form multi-hop networks. This provides a quick, easy...

Tags: IEEE 802.11, Voice, WLAN, IEEE 802.16, Chinese University Of Hong Kong, WiMAX, Wireless LANs, Wireless, Wi-Fi, LANs, Networking

White papers 2005-05-01

Voice Over Wireless LAN Via Wireless Distribution System

Today, most Wireless LANs W LAN are connected to the backbone via a wired Distribution System DS. A Wireless Distribution System WDS provides quick and easy networking in circumstances that require temporary network services or when cabling is difficult, for example, in open area conversations, disasters and military usages. WDS...

Tags: Voice, WLAN, Chinese University Of Hong Kong, Wireless Distribution System, Wi-Fi, Wireless LANs, LANs, Wireless, Networking

White papers 2005-01-28

Solutions to Performance Problems in VoIP Over 802.11 Wireless LAN

VoIP over WLAN is poised to become an important Internet application. However, two major technical problems that stand in the way are low VoIP capacity in WLAN and unacceptable VoIP performance in the presence of coexisting traffic from other applications. With each VoIP stream typically requiring less than 10 Kbps,...

Tags: 802.11 Wireless LAN, IEEE 802.11, Performance, WLAN, Chinese University Of Hong Kong, Telephony, Wireless LANs, VOIP, Telecommunications, Wi-Fi, Wireless, Networking

White papers 2004-08-17

Additional Resources

Chinese...How's that for a 21st Century Skill?

Chinese...How's that for a 21st Century Skill?Not a needed skillMany Chinese people are learning English from an early age.Imagine a situation in which a person with some Chinese in school is in a meeting with a Chinese person who has spent decades working on fluency in English. How likely...

Tags: Chinese People

Discussion threads 2008-12-05

When it comes to China, is Skype the new Yahoo?

Any major Western company doing business in China is collaborating with the government to some degree. We know this. Chinese citizens know this. The best case scenario is probably Microsoft or Google's operations where access to certain information is limited. The worst case, until now, has been Yahoo's explicit cooperation...

Tags: China, Yahoo! Inc., Skype Technologies S.A., Tom, Government, Blogging, Vertical Industries, Wireless, Internet, Enterprise Software, Software, Richard Koman

Blog posts 2008-10-03

China cuts off iTunes, likely over 'Songs of Tibet'

China cuts off iTunes, likely over 'Songs of Tibet'Learn from M$, Google and YahooThey cooperated with the local bully, they were allowed to run business over there. Don't p*ss of their government, that's the key in China. Yahoo went so far they handed in evidence to China government to help...

Tags: Tibetan family, Han, census, Apple iTunes

Discussion threads 2008-08-22

Cloud Computing for Students

Cloud Computing for StudentsRather absurd..."Without opportunities like this, most CS students graduate without ever writing anything bigger than an application written in one programming language that runs on a single machine."Why not? Most large universities have big, heterogeneous environments with Windows, Apple, and several flavors of Unix. As...

Tags: SEARCH, Marketing research, search engine, search engine marketing, programming, Timev Media

Discussion threads 2007-10-08