osaka university

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Parameter Tuning of Rate-Based Congestion Control Algorithms and Its Application to TCP Over ABR

In this paper, the rate-based congestion control algorithm that has been standardized in the ATM Forum is evaluated. Its behavior is analyzed by utilizing a first-order fluid approximation to provide control parameter tuning. This paper obtains the maximum queue length at the switch and conditions for avoiding under-utilization. The results...

Tags: Algorithm, Congestion Control, TCP, Osaka University, Tcp/Ip, Networking

White papers 2007-11-16

Congestion Propagation Among Routers in the Internet

In recent years, various non-linear phenomena of the Internet have been discovered. For instance, it is reported that congestion of a router propagates to neighboring routers like a wave. Several researches on congestion propagation among routers have been performed. However, in these researches, cause of congestion propagation and condition that...

Tags: Internet, Router, Osaka University, Congestion Propagation, Routers & Switches, Network Technology, Networking

White papers 2007-11-16

A Control Theoretical Approach to a Window-Based Flow Control Mechanism With Explicit Congestion Notification

A window-based flow control mechanism is a sort of feedback-based congestion control mechanisms, and has been widely used in current TCP/IP networks. Recently proposed TCP Vegas is another version of the TCP mechanism and has potential to achieve much better performance than current TCP Tahoe and Reno. However, it has...

Tags: Mechanism, Window, TCP, Osaka University, Tcp/Ip, Networking

White papers 2007-11-16

On Parameter Tuning of Data Transfer Protocol GridFTP for Wide-Area Grid Computing

In wide-area Grid computing, geographically distributed computational resources are connected for enabling efficient and large-scale scientific/engineering computations. In the wide-area Grid computing, a data transfer protocol called GridFTP has been commonly used for large file transfers. GridFTP has the following features for solving problems of the existing TCP. First, for...

Tags: TCP, Osaka University, GridFTP, Tcp/Ip, Networking

White papers 2007-11-16

A Window-Based Flow Control Mechanism Based on TCP Vegas With Explicit Congestion Notification

A window-based flow control mechanism is a sort of feedback-based congestion control mechanisms, and has been widely used in TCP/IP networks. Recently proposed TCP Vegas is another version of the TCP mechanism and has potential to achieve much better performance than current TCP Tahoe and Reno. This paper focuses on...

Tags: Mechanism, Window, TCP, Osaka University, Tcp/Ip, Construction, Networking

White papers 2007-11-16

Analysis of a Window-Based Flow Control Mechanism Based on TCP Vegas in Heterogeneous Network Environment

Another version of TCP called TCP Vegas has been proposed and studied in the literature. It can achieve better performance than the current TCP Reno. In the previous studies, steady-state behavior of a window-based flow control mechanism based on TCP Vegas has been analyzed for a simple network topology. This...

Tags: Network, Window, TCP, Analysis, Osaka University, Tcp/Ip, Networking

White papers 2007-11-16

Understanding TCP Over TCP: Effects of TCP Tunneling on End-to-End Throughput and Latency

TCP tunnel is a technology that aggregates and transfers packets sent between end hosts as a single TCP connection. By using a TCP tunnel, the fairness among aggregated flows can be improved and several protocols can be transparently transmitted through a firewall. Currently, many applications such as SSH, VTun, and...

Tags: Latency, TCP, Osaka University, Tcp/Ip, Networking

White papers 2007-11-16

Ring-Based Virtual Private Network Supporting a Large Number of VPNs

This paper proposes a simple but effective VPN mechanism called RING-VPN (Ring-based Virtual Private Network) that realizes a high scalability in terms of the number of VPNs. The key idea of the RING-VPN is to logically connect nodes in a ring topology for minimizing the number of IPsec tunnels. In...

Tags: Osaka University, RING-VPN, VPNs, Network Security, Telecommunications, Networking, Security

White papers 2007-11-16

Scalable IP-VPN Flow Control Mechanism Supporting Arbitrary Fairness Criteria

In recent years, IP-based Virtual Private Networks (IP-VPNs), which provide a virtual privately owned network over an IP network, have attracted attention. With existing IP-VPNs, however, there is a serious problem that fairness among IPVPN customers is not satisfied. This paper first discuss design objectives of a control mechanism for...

Tags: IP VPN, Fairness, Osaka University, VPNs, Network Security, Networking, Telecommunications

White papers 2007-11-16

On Layered VPN Architecture for Enabling User-Based Multiply Associated VPNs

This paper proposes a layered VPN architecture for realizing user-based multiply associated VPN. This layered VPN architecture consists of three network levels such as PNL Physical Network Level, LNL Logical Network Level, and UNL User Network Level. First, the paper discusses and classifies functions required for each network level. Then...

Tags: Network, Layered Technologies Inc., Osaka University, Network Level, VPNs, Networking, Network Security, Telecommunications, Security

White papers 2007-11-16

A Prototype Implementation of VPN Enabling User-Based Multiple Association

In this paper author implement a prototype system of a VPN that enables users to be associated with multiple VPNs using existing network technologies for demonstrating the feasibility of the architecture and for clarifying the service image of a multiple association service. This prototype system enables hosts to be simultaneously...

Tags: Osaka University, VPNs, Network Security, Telecommunications, Networking, Security

White papers 2007-11-16

Inside Theory-Aware and Standards-Compliant Authoring System

In their paper, Bourdeau and Mizoguchi foresaw a framework for ontology-based intelligent systems. Although it took longer years than their expectation, the ontology they have been developing is now released for evaluation with the help of the second author. Ontology building is a labor-intensive process and it is rarely perfect....

Tags: Theory, Authoring System, Ontology, Standards, Osaka University, Strategy, Management

White papers 2007-07-18

Inline Network Measurement: TCP Built-In Techniques for Inferring End-to-End Bandwidth

This paper introduces a method for measuring the available bandwidth in a network path between two end hosts using an active TCP connection. First it constructs a new measurement algorithm that uses a relatively small number of probe packets yet provides periodic measurement results quickly. Then it applies the proposed...

Tags: Technique, Bandwidth, Network, TCP, Osaka University, ImTCP, Tcp/Ip, Networking

White papers 2007-01-01

Congestion Control Mechanism of TCP for Achieving Predictable Throughput

The demand of Internet users for diversified services has increased due to the rapid development of the Internet, and applications requiring QoS guarantee, such as real-time media delivery services, have become popular. The research group has proposed transport-layer approaches to provide such high-level quality of network services. This paper proposes...

Tags: Congestion Control, Throughput, TCP, Osaka University, Research Group, Tcp/Ip, Internet, Networking

White papers 2006-10-12

Modeling TCP Throughput Over Wired/Wireless Heterogeneous Networks for Receiver-Based ACK Splitting Mechanism

Recently, heterogeneous networks with wired and wireless links are becoming common. However, the performance of TCP data transmission deteriorates significantly over such networks because of packet losses caused by the high bit error rate of wireless links. The paper had proposed receiver-based ACK splitting mechanism to solve that problem previously....

Tags: Bit Error Rate, Wireless Link, Modeling, Wireless, Osaka University, Tcp/Ip, Networking

White papers 2006-04-22

Performance Analysis of Large-Scale IP Networks Considering TCP Traffic

This paper proposes a novel analysis method for large-scale networks with consideration of the behavior of the congestion control mechanism of TCP. In the analysis, the paper models the behavior of TCP at end-host and network link as an independent system, and combines them into a single system in order...

Tags: Performance, Network, IP, TCP, IP Network, Analysis, Osaka University, Tcp/Ip, Networking

White papers 2006-02-09

Scalable Socket Buffer Tuning for High-Performance Web Servers

Although many research efforts have been devoted to network congestion in the face of an increase in the Internet traffic, there is little discussion on performance improvements for endhosts. This paper proposes a new architecture, called Scalable Socket Buffer Tuning SSBT, to provide high-performance and fair service for many TCP...

Tags: High-performance, TCP, Osaka University, Scalable Socket Buffer Tuning, Tcp/Ip, Internet, Leadership, Networking, Management

White papers 2001-10-02

Additional Resources

Robot buoy to track oil spills

Yesterday, Japan Today reported about a prototype of robotic buoy developed at Osaka University to fight sea pollution in the event of an environmental disaster caused by an oil spill. The current prototype, dubbed SOTAB (short for 'Spilled Oil Tracking Autonomous Buoy') is a 110-kilogram GPS-equipped robot. The cylindrical buoy...

Tags: Oil, Buoy, Robots, Emerging Technologies, Roland Piquepaille

Blog posts 2008-08-03

The first optical pacemaker

According to a short news release from the Optical Society of America OSA, an international team of scientists at Osaka University in Japan has used a femtosecond laser pacemaker to control heart muscle cells. So far, this optical pacemaker will only be used for laboratory research. As writes OSA, 'exposing...

Tags: Heart, Contraction, Laser, Cell, Roland Piquepaille

Blog posts 2008-05-29

Protein nanotech in next gen storage

The magnetic spots in disk storage are already smaller than semiconductor feature sizes, and patterned media and heat-assisted recording will allow 10 TB 2.5" disks in a few years. But then what? Optical protein-based recording could be the answer. Scientists at a Osaka University lab have demonstrated...

Tags: Disk, Protein, Nanotechnology, Protein Storage, Storage, Hardware, Robin Harris

Blog posts 2008-02-13