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SIP-based QoS control over satellite networks

SIP-based QoS control over satellite networks

引用

International Conference on Emerging Technologies, ICET

作者： R.I. Qureshi O. Alphand Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan Software & Tools for Communication Group CNRS-LAAS Toulouse France

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CDMA Based Wireless Transceiver System MATLAB Simulation and FPGA Implementation

CDMA Based Wireless Transceiver System MATLAB Simulation and...

引用

Student Conference on engineering Sciences and technology, SCONEST

作者： Zohaib Mahtab Suhaib Jalis Ahmed syed Sameem Hussain Sarwar Hasan Department of Computer & Information Systems Engineering N.E.D. University of Engineering and Technology Karachi Pakistan

Code Division Multiple Access (CDMA) has become the technology of choice for the current and future generation of wireless systems. We have implemented the CDMA IS-95 based Wireless Transceiver System using Matlab Simulink v 7.0. The entire system is implemented using the Xilinx System Generator Block v6.3. Even though the CDMA IS-95 system is already implemented in Simulink and is provided as a demo, there is no way of converting it into real Hardware. Using Xilinx System Generator we have made our implementation capable of being translated into any of the HDL codes. This can be then mapped onto appropriate FPGA easily. We have used the hardware co-simulation feature of the Xilinx System generator to create a library of the basic building blocks of the IS-95 system. This library can be used for implementing to create the various channels that are the part of the CDMA system.

关键词： Multiaccess communication Transceivers MATLAB Field programmable gate arrays Libraries Hardware Cyclic redundancy check Viterbi algorithm Decoding Filters

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Role of agents in providing better communication

Role of agents in providing better communication

引用

Student Conference on engineering Sciences and technology, SCONEST 2004

作者： Bawany, Narmeen Shawoo Paracha, Asma Mushakbar Naz, Nadia Department of Computer Science and Information Technology Jinnah University for Women Karachi Pakistan Department of Computer Engineering Sir Syed Univerversity of Engineering and Technology Karachi Pakistan

ISBN: (纸本)0780388712

Strong growth of both Internet and mobile communication leads to new promising mass-market end-user applications. Telecommunications and computing industries are not only merging their main concepts, but working towards a similar goal, namely to have fully cooperative communication systems that help automate various everyday tasks or chores. Software agent technology provides benefit to both the network Manager and the end user, so that communications systems can be efficiently maintained, which in turn provides increased business productivity and improved value added services. Sophisticated softwares are involved in Communications management and control which aid in decision making on how the network system should be configured and operated. Agents, especially mobile agents seem to be best suited because of their characteristics of autonomy, intelligence, mobility, co-ordination and cooperation. Mobile multi-agent system, control the network elements without having to rely on human mangers. In this paper we examine how mobile agents can enhance traditional connectivity provisioning management services, allowing flexible customer network management with respect to performance, fault and dynamic reconfiguration which are driven by customer-defined policies. © 2004 IEEE.

关键词： Wireless telecommunication systems

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Multislot scheduling algorithm in ATM networks

Multislot scheduling algorithm in ATM networks

引用

Proceedings - 2004 International Networking and Communication Conference, INCC 2004

作者： Khan, M. Sadiq Ali Burney, S. M. Aqil Naseem, M. Department of Computer Science University of Karachi Department of Computer Engineering Sir Syed University of Engg. and Tech.

ISBN: (纸本)0780383257

A key implementation issue of multicast switching systems is the reduction of cell conflicts, which occur when two, or more cells approaches for the same link, internal link or output link, simultaneously. When a cell conflicts occurs, only one of the contending cells is allowed to access the link and the others are dropped or stored in some internal buffers. The cell contention is the basic reason that drops the switch throughput. Several Contention Resolution Schemes have been proposed. Each input port is associated with a tag-queue for storing a routing text of arriving cells, and a cell-scheduling controller is provided to resolve the output contention problem according to the HOL entries of Tag queues. The proposed algorithm differs from previous algorithms in that we consider the output contention resolution for multiple slots instead of the current time slot only. Like window based scheduling algorithm, our algorithm allows cells behind an HOL cell to be transmitted prior to HOL cell in the same input port. Thus, HOL blocking can be alleviated. This Algorithm has illustrated that the delay throughput performance of our algorithm outperforms most of those algorithms that consider only the output contention resolution for the current time slot. ©2004 IEEE.

关键词： Switching systems

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Developing a framework to implement security in web services

引用

2nd International Workshop on Grid and Cooperative Computing, GCC 2003

作者： Alvi, Fawaz Amin Khoja, Shakeel A. Jabeen, Zohra Sir Syed University of Engineering and Technology Karachi Pakistan Karachi Institute of Information Technology Karachi Pakistan

ISBN: (纸本)3540219889

Recent advancement in XML and increasing use of World Wide Web allow users to use internet as a document sharing and hosting system, with certain security features. Currently no guidelines are available for developers to enforce security policies for XML andWeb Services. It is crucial in order to facilitate a secure dissemination of XML documents, containing information of different sensitivity levels, among (possibly large) user communities. The paper concentrates on developing a framework and proposing design considerations to implement the PKI enables security in XML documents and web services, by defining a component model and processing rules that can be shared across applications using common tools, avoiding the need for extensive customisation of applications to add security. This allows interoperability with a wide range of existing infrastructures and across deployments. © Springer-Verlag Berlin Heidelberg 2004.

关键词： XML

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A generalized framework for distributed intelligent process automation

A generalized framework for distributed intelligent process ...

引用

International Workshop on Robot Motion and Control (RoMoCo)

作者： S. Enam-ur-Rehman A. Sikander U. Shafique Department of Computer Engineering Sir Syed University of Engineering & Technology Karachi Pakistan

Rapid advancements in computing have lead to sophisticated solutions for real world problems requiring complex logic, hefty interfaces and growing need of intelligence. This elaborates the importance of isolation of logic from interfaces and the availability of reusable standardized tools for tasks, most commonly required by various processes. Auto-Mate is a generic framework aimed at meeting these requirements. A novel approach has been adopted by employing Soar (a general cognitive architecture and AI engine) as a dedicated element for controlling the functionality of the system. The framework also focuses on providing standardized and generic interfaces for software components as well as physical links for hardware interconnection. The framework is made extendible, scalable and compatible with multiple platforms and services for supporting applications of variant magnitudes and scope. Auto-Mate is most suitable for process automation based on discrete events.

关键词： Automation Automatic control Logic Application software Artificial intelligence Engines Hardware Scalability computer interfaces Control systems

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Multislot scheduling algorithm in ATM networks

Multislot scheduling algorithm in ATM networks

引用

IEEE International Networking and Communications Conference, INCC

作者： M.S.A. Khan S.M.A. Burney M. Naseem Department of Computer Science University of Karachi Pakistan Department of Computer Engineering Sir Syed University of Engineering and Technology Pakistan

A key implementation issue of multicast switching systems is the reduction of cell conflicts which occur when two, or more, cells approach for the same link, internal link or output link, simultaneously. When a cell conflict occurs, only one of the contending cells is allowed to access the link and the others are dropped or stored in internal buffers. The cell contention is the basic reason that the switch throughput drops. Several contention resolution schemes have been proposed. Each input port is associated with a tag queue for storing a routing text of arriving cells, and a cell-scheduling controller is provided to resolve the output contention problem according to the HOL (head-of-line) entries of tag queues. The proposed algorithm differs from previous algorithms in that we consider the output contention resolution for multiple slots instead of only the current time slot. Like a window based scheduling algorithm, our algorithm allows cells behind an HOL cell to be transmitted prior to the HOL cell in the same input port. Thus, HOL blocking can be alleviated. The delay throughput performance of our algorithm outperforms most of those algorithms that consider the output contention resolution only for the current time slot.

关键词： Scheduling algorithm Intelligent networks Asynchronous transfer mode Switches Routing Switching systems Job shop scheduling Multicast algorithms Buffer storage Throughput

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Role of Agents in Providing Better Communication

Role of Agents in Providing Better Communication

引用

Student Conference on engineering, Sciences and technology

作者： N.S. Bawany A.M. Paracha N. Naz Department of Computer Science and Information Technology Jinnah University for Women Karachi Pakistan Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan

Strong growth of both Internet and mobile communication leads to new promising mass-market end-user applications. Telecommunications and computing industries are not only merging their main concepts, but working towards a similar goal, namely to have fully co-operative communication systems that help automate various everyday tasks or chores. Software agent technology provides benefit to both the network Manager and the end user, so that communications systems can be efficiently maintained, which in turn provides increased business productivity and improved value added services. Sophisticated softwares are involved in Communications management and control which aid in decision making on how the network system should be configured and operated. Agents, especially mobile agents seem to be best suited because of their characteristics of autonomy, intelligence, mobility, co-ordination and cooperation. Mobile multi-agent system, control the network elements without having to rely on human mangers. In this paper we examine how mobile agents can enhance traditional connectivity provisioning management services, allowing flexible customer network management with respect to performance, fault and dynamic reconfiguration which are driven by customer-defined policies.

关键词： Mobile communication Communication system control Control systems Mobile agents Internet Application software computer applications Telecommunication computing Communication industry computer industry

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Developing a framework to implement public key infrastructure enabled security in XML documents 7

Developing a framework to implement public key infrastructur...

引用

7th IEEE International Multi Topic Conference, INMIC 2003

作者： Alvi, F.A. Khoja, S.A. Jabeen, Z. Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan Department of Computer Science Karachi Institute of Information Technology Karachi Pakistan

ISBN: (纸本)0780381831

This work concentrates on proposing a framework to implement the PKI which enables security in XML documents, by defining a common framework and processing rules that can be shared across applications using common tools, avoiding the need for extensive customization of applications to add security. The Framework reuses the concepts, algorithms and core technologies of legacy security systems while introducing changes necessary to support extensible integration with XML. This allows interoperability with a wide range of existing infrastructures and across deployments. Currently no strict security models and mechanisms are available that can provide specification and enforcement of security policies for XML documents. Such models are crucial in order to facilitate a secure dissemination of XML documents, containing information of different sensitivity levels, among (possibly large) user communities. © 2003 IEEE.

关键词： Web services

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Fuzzy control of baseline activity within the basal ganglia of rat brain 7

Fuzzy control of baseline activity within the basal ganglia ...

引用

7th IEEE International Multi Topic Conference, INMIC 2003

作者： Ozair, M.Z. Enam-Ur-Rehman, S. Enam, S.A. Department of Biological and Biomedical Sciences Aga Khan University and Hospital Karachi Pakistan Department of Computer Engineering Sir Syed University of Engineering and Technology Karachi Pakistan Department of Neurosurgery Henry Ford Health Systems MI United States

ISBN: (纸本)0780381831

Deep brain stimulation (DBS) is an increasingly popular treatment modality for Parkinson's disease (PD) based on chronic electrical stimulation of the basal ganglia. The basal ganglia are responsible for regulating motor control of the human body, a function exemplified by disease states such as PD. We describe a novel technique based on a chronically implantable neural prosthetic device that could be used as a potential treatment in many basal ganglia disorders, including PD. The prosthetic device implements a fuzzy control of the baseline excitation of the motor cortex and derives a feedback loop from the thalamocortical pathway, thus forming a closed loop control. It improves over DBS by being self-adjustable, thereby eradicating the need of repeated adjustments of various parameters of the excitatory signal(s). The neural prosthetic device can be implanted in a rat brain and the fuzzy control rule set be derived from in vitro organotypic slice culture models of the basal ganglia. © 2003 IEEE.

关键词： Neurodegenerative diseases

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