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Multicast based audio/video collaboration system is one of representative applications in next generation internet. Adopting multicast technique could save bandwidth for multipoint-to-multipoint audio/video communication. Lack of ubiquitous native multicast limits the application, and current multicast based A/V collaboration systems lack effective control mechanism. This paper introduces one controllable...
Aspect Oriented Programming (AOP) was introduced 10 years ago and many research projects have focused on broadening AOP and its target areas. However, few applications in the Grid computing world adopt AOP in comparison with very vigorous research of AOP. Therefore, we present a case study that covers a general networking problem in the Grid computing. AOP provides a novel solution of the problem...
In order to make the best use of available energy budget, we propose a QoS adjustment method which maximizes the total QoS-provisioning of multimedia tasks with uncertain execution time. This method utilizes the probability distribution of task’s execution time to determine an instant QoS level. Our experiments show that the proposed method gives 52% more QoS-provisioning than the conventional method...
In this paper, we propose a Reconfigurable Access Terminal (RAT) which is composed of SDR(Software Defined Radio) hardware platform test bed and SCA(Software Communication Architecture) - based software platform. Specifically, we propose a design of the SDR Access Terminal middleware, wireless protocol software component and the procedure of reconfiguration which changes one mode into the other mode...
Mobile Ad hoc Networks (MANETs) are very attractive for many applications. However, media streaming over MANET is quite challenging task. In this paper, we depict a framework for audio streaming over multihop wireless network. And we propose multipath routing for MANET and investigated media streaming using different scalable speech coding techniques. With the simulation results, performance of such...
In this paper, a design for a low-power 512-bit synchronous EEPROM with flash cells for passive UHF RFID tag chip is presented. Applied are low-power schemes such as dual power supply voltage(VDD=1.5V and VDDP=2.5V), clocked inverter sensing, voltage-up converter, IO interface, and Dickson charge pump using schottky diode. An EEPROM is fabricated with the 0.25μm- EEPROM process. Simulation results...
Many service discovery protocols have been proposed by far to support ubiquitous computing. But they don’t always apply to ubiquitous computing because of their confines. In this paper, we propose a service discovery protocol named VPDP adopted in our DOM-based middleware architecture, which aims to support as many types of ubiquitous environments as possible. VPDP is important for our middleware...
Business Intelligence (BI) Systems are today considered as a major strategic tool of many well-established companies like Lufthansa, TDC Telecom and AT&T. Of course, the knowledge derived from the experience of those companies could be helpful guide in building efficient BI Systems. Thus, this study highlights the main points arisen from the worldwide practice of building successful BI Systems...
This paper proposes an algorithm for tracking of the residual phase errors incurred by carrier and sampling frequency offset in the OFDM transmission systems which is suitable for high speed and high capacity wireless multimedia communication networks. The proposed scheme utilizes the degree of the channel fading in the frequency domain in the offset tracking procedure which improves the error estimation...
In this paper, we propose the dynamic memory manager and garbage collector for the embedded Java virtual machine. In order to facilitate to memory allocation and deallocation fast, the memory manager divides a heap into various sizes and thus manages it with the unit of block which is a set of identical cell. And we propose a new 4-color based Mark & Sweep garbage collector in order to support...
In lager-scale P2P file sharing systems, peers often must interact with unknown or unfamiliar peers without the benefit of trusted third parties or authorities to mediate the interactions. The decentralized and anonymous characteristics of P2P environments make the task of controlling access to sharing information more difficult. In this paper, we identify access control requirements and propose a...
Wireless sensor networks generally have three kinds of objects: sensor nodes, sinks, and users that send queries and receive data via the sinks. In addition, the user and the sinks are mostly connected to each other by infrastructure networks. The users, however, should receive the data from the sinks through multi-hop communications between disseminating sensor nodes if such users move into the sensor...
Peer-to-peer (P2P) file sharing systems often replicate files to multiple nodes. File replication is beneficial in the sense that it can achieve good query latency, load balance, and reliability. However, it introduces another problem of maintaining mutual consistency among replica when a file is updated. The new file has to be propagated to all of its replica. In this paper, we propose an update...
In this paper we present work in progress on extending multimedia conferencing standards to scalable, mobile multimedia group support based on SIP initiated Source Specific IP Multicast. We propose extensions of SIP for negotiating SSM sessions. SIP protocol specifications and semantics are compatibly extended without adding new SIP methods. We will introduce a multimedia communication software with...
Recently, Peer-to-Peer (P2P) technology has become one of the hottest topics in the research area of Internet. With a variety of P2P applications, especially those applications sharing large-size file resources among a large scale of user community, P2P brought us an even more exciting Internet life. However, P2P also made lots of troubles to network managers because of consuming too much network...
We propose an algorithm to realize proportional bandwidth allocation in DiffServ networks. According to the feedback information, ingress routers adjust Committed Information Rates (CIRs) of different aggregates using AIMD way to let the network reach an exactly subscribed state. Based on CIRs, packets are marked. Simulations with ns2 show that proportional bandwidth allocation under different network...
In multi-level HMIPv6 (M-HMIPv6) networks the MN has to select a proper MAP using MAP selection schemes when migrating to the visited ARs. Currently, distance-based MAP Selection (DMS), Mobility-based MAP Selection (MMS) and Adaptive MAP Selection (AMS) schemes have been proposed, and AMS outperforms the other ones in several aspects. However, none of these schemes consider the handover Quality-of-Service...
Web service composition is a promising technology to effectively integrate distributed autonomous services in service oriented paradigm. When providing composite services, ensuring user experienced QoS (Quality of Service) in dynamic environment poses a great challenge. In this paper, we present a distributed service selection approach for optimizing composite service with complex structures. The...
Traffic sampling technology has been widely deployed in front of many high-speed network applications to alleviate the great pressure on packet capturing. However, knowing the number and length of the original flows is necessary for some applications. This paper provides a novel method that uses flow statistics formed from sampled packet stream to infer the absolute frequencies of lengths of flows...
In this paper, we proposed an IP Local Link-Protection (IPLLP) scheme based on the characteristic of shortest-path routing in IP networks. Our scheme working in an intra-area routing domain provides a simple and efficient solution to improve IP network survivability without extra control protocols and enhanced routing protocols. Because the backup next hops are predetermined in advance, the service...
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