Umar Waqas | Comsats University Islamabad (original) (raw)
Papers by Umar Waqas
Proceedings of the WESE'15: Workshop on Embedded and Cyber-Physical Systems Education, 2015
Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing s... more Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing such systems is a challenging task due to the multi-disciplinary nature of these systems, and the range of abstraction levels involved. To facilitate hands-on experience with such systems, we develop a cyber-physical platform that aids in research and education on CPS. This paper describes this platform, which contains all typical CPS components. The platform is used in various research and education projects for bachelor, master, and PhD students. We discuss the platform and a number of projects and the educational opportunities they provide.
Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing s... more Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing such systems is an especially challenging task due to the multi-disciplinary nature of these systems, and the range of abstraction levels involved. To facilitate hands-on experience with such systems, we develop a cyber-physical platform that aids in both research and education on CPS. This paper describes this platform, which contains all typical CPS components. The platform is used in various research and education projects for bachelor, master, and PhD students. We discuss the platform and illustrate its use with a number of projects and the educational opportunities they provide.
Today’s manufacturing systems are typically complex cyber-physical systems where the physical and... more Today’s manufacturing systems are typically complex cyber-physical systems where the physical and control aspects interact with the scheduling decisions. Optimizing such facilities requires ordering jobs and configuring the manufacturing system for each job. This optimization problem can be described as a Multi-Objective Generalized TSP where conflicting objectives lead to a trade-off space. This is the first work to address this TSP variant, introducing a compositional heuristic suitable to online application.
Wireless communication has become an integral part of our everyday life. In order to meet the cur... more Wireless communication has become an integral part of our everyday life. In order to meet the current requirements of wireless operators and technology providers, Software Defined Radios (SDRs) are used. SDR is a form of radio that performs the signal processing in software. The requirements include flexible design, upgrade and reuse of radios. In this thesis, we propose a model based design approach to develop SDRs. Specifically, we present constructs to model the digital baseband processing in an SDR. As a case study, we model a Digital Video Broadcasting Terrestrial (DVBT) decoder over a heterogeneous Multi Processor System-on-Chip (MPSoC) which is MARS. A typical SDR may have data and reception dependent operations referred to as scenarios during its operation. These operations have varying resource requirements. We present constructs to model scenarios. Moreover, we identify the scenarios present in a DVBT decoder. SDRs usually have a high data rate that requires efficient impl...
2018 21st Euromicro Conference on Digital System Design (DSD), Aug 1, 2018
DOI to the publisher's website. • The final author version and the galley proof are versions of t... more DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:
A Large Scale Printer (LSP) is a Cyber Physical System (CPS) printing thousands of sheets per day... more A Large Scale Printer (LSP) is a Cyber Physical System (CPS) printing thousands of sheets per day with high quality. The print requests arrive at run-time requiring online scheduling. We capture the LSP scheduling problem as online scheduling of reentrant flowshops with sequence dependent setup times and relative due dates with makespan minimization as the scheduling criterion. Exhaustive approaches like Mixed Integer Programming can be used, but they are compute intensive and not suited for online use. We present a novel heuristic for scheduling of LSPs that on average requires 0.3 seconds per sheet to find schedules for industrial test cases. We compare the schedules to lower bounds, to schedules generated by the current scheduler and schedules generated by a modified version of the classical NEH (MNEH) heuristic [1], [2]. On average, the proposed heuristic generates schedules that are 40% shorter than the current scheduler, have an average difference of 25% compared to the estimated lower bounds and generates schedules with less than 67% of the makespan of schedules generated by the MNEH heuristic.
Proceedings of the WESE'15: Workshop on Embedded and Cyber-Physical Systems Education, 2015
Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing s... more Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing such systems is a challenging task due to the multi-disciplinary nature of these systems, and the range of abstraction levels involved. To facilitate hands-on experience with such systems, we develop a cyber-physical platform that aids in research and education on CPS. This paper describes this platform, which contains all typical CPS components. The platform is used in various research and education projects for bachelor, master, and PhD students. We discuss the platform and a number of projects and the educational opportunities they provide.
Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing s... more Cyber-Physical Systems (CPS) play an important role in the modern high-tech industry. Designing such systems is an especially challenging task due to the multi-disciplinary nature of these systems, and the range of abstraction levels involved. To facilitate hands-on experience with such systems, we develop a cyber-physical platform that aids in both research and education on CPS. This paper describes this platform, which contains all typical CPS components. The platform is used in various research and education projects for bachelor, master, and PhD students. We discuss the platform and illustrate its use with a number of projects and the educational opportunities they provide.
Today’s manufacturing systems are typically complex cyber-physical systems where the physical and... more Today’s manufacturing systems are typically complex cyber-physical systems where the physical and control aspects interact with the scheduling decisions. Optimizing such facilities requires ordering jobs and configuring the manufacturing system for each job. This optimization problem can be described as a Multi-Objective Generalized TSP where conflicting objectives lead to a trade-off space. This is the first work to address this TSP variant, introducing a compositional heuristic suitable to online application.
Wireless communication has become an integral part of our everyday life. In order to meet the cur... more Wireless communication has become an integral part of our everyday life. In order to meet the current requirements of wireless operators and technology providers, Software Defined Radios (SDRs) are used. SDR is a form of radio that performs the signal processing in software. The requirements include flexible design, upgrade and reuse of radios. In this thesis, we propose a model based design approach to develop SDRs. Specifically, we present constructs to model the digital baseband processing in an SDR. As a case study, we model a Digital Video Broadcasting Terrestrial (DVBT) decoder over a heterogeneous Multi Processor System-on-Chip (MPSoC) which is MARS. A typical SDR may have data and reception dependent operations referred to as scenarios during its operation. These operations have varying resource requirements. We present constructs to model scenarios. Moreover, we identify the scenarios present in a DVBT decoder. SDRs usually have a high data rate that requires efficient impl...
2018 21st Euromicro Conference on Digital System Design (DSD), Aug 1, 2018
DOI to the publisher's website. • The final author version and the galley proof are versions of t... more DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:
A Large Scale Printer (LSP) is a Cyber Physical System (CPS) printing thousands of sheets per day... more A Large Scale Printer (LSP) is a Cyber Physical System (CPS) printing thousands of sheets per day with high quality. The print requests arrive at run-time requiring online scheduling. We capture the LSP scheduling problem as online scheduling of reentrant flowshops with sequence dependent setup times and relative due dates with makespan minimization as the scheduling criterion. Exhaustive approaches like Mixed Integer Programming can be used, but they are compute intensive and not suited for online use. We present a novel heuristic for scheduling of LSPs that on average requires 0.3 seconds per sheet to find schedules for industrial test cases. We compare the schedules to lower bounds, to schedules generated by the current scheduler and schedules generated by a modified version of the classical NEH (MNEH) heuristic [1], [2]. On average, the proposed heuristic generates schedules that are 40% shorter than the current scheduler, have an average difference of 25% compared to the estimated lower bounds and generates schedules with less than 67% of the makespan of schedules generated by the MNEH heuristic.