yasser mohamed | Alexandria University (original) (raw)

Papers by yasser mohamed

J Manage Eng, 2009

The importance of integrating construction knowledge into the design process has long been recogn... more The importance of integrating construction knowledge into the design process has long been recognized by the construction industry. This paper studies early contractor involvement in design and its impact on construction schedule performance through a ...

Ieee Transactions on Power Electronics, 2007

J Constr Eng Manage Asce, 2005

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving th... more The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving the management of radioactive sealed sources (RSSs) in Egypt. When completed, IMPRSS will protect the people and the environment from another radioactive incident. The ...

The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving th... more The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving the management of radioactive sealed sources (RSSs) in Egypt. When completed, IMPRSS will protect the people and the environment from another radioactive incident. The ...

Proceedings of the 40th Conference, 2008

Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distribu... more Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distributing a number of resources amongst multiple agents. This field has interdisciplinary characteristics and relates to a wide range of applications, such as industrial procurement, scheduling and network routing. Many construction operations involve entities sharing and competing for limited resources. The decision to allocate these resources to entities usually has a significant impact on the schedule and cost of these operations. The dynamic and continuously changing nature of construction operations justifies the need for decision support tools with high adaptability and handling of uncertainty which is featured by MARA. This paper presents the main elements and techniques in MARA and discusses a sample case applying these techniques for the modeling of industrial construction assembly processes, also presents the conceptual model of the sample case and a prototype implementation of that model using Repast multi-agent simulation package.

Proceedings of the 40th Conference, 2008

Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distribu... more Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distributing a number of resources amongst multiple agents. This field has interdisciplinary characteristics and relates to a wide range of applications, such as industrial procurement, scheduling and network routing. Many construction operations involve entities sharing and competing for limited resources. The decision to allocate these resources to entities usually has a significant impact on the schedule and cost of these operations. The dynamic and continuously changing nature of construction operations justifies the need for decision support tools with high adaptability and handling of uncertainty which is featured by MARA. This paper presents the main elements and techniques in MARA and discusses a sample case applying these techniques for the modeling of industrial construction assembly processes, also presents the conceptual model of the sample case and a prototype implementation of that model using Repast multi-agent simulation package.

Journal of Construction Engineering and Management, Mar 1, 2011

Journal of Construction Engineering and Management, Mar 1, 2011

Journal of Computing in Civil Engineering, Jul 1, 2005

ABSTRACT Modeling and analyzing construction operations using simulation techniques allows resear... more ABSTRACT Modeling and analyzing construction operations using simulation techniques allows researchers to capture the uncertainty and randomness usually associated-with these operations and can thus be an effective tool for analysis and improvement. However, the effort and knowledge required to build simulation models and experiment with them tend to limit the use of simulation in construction. A common recommendation for removing this obstacle found in the literature leans towards developing simulation tools that reduce model development and experimentation time on the construction engineer's side by-packaging most of the knowledge required into the tool itself. Such "intelligent" simulation modeling tools may significantly impact the way construction engineers use simulation techniques in day-to-day decision making. This paper presents a framework that extends and formalizes this recommendation by providing the foundation for building intelligence into simulation objects. The proposed framework provides the structure necessary for building intelligence and autonomy into simulation objects and permits,a further reduction in the knowledge required to experiment with simulation models. This approach also automates model modification, not only through changes in numeric parameters, but through topological model changes as well, which may assist the model user in making. marry decisions throughout the different phases of simulation experimentation.

Journal of Computing in Civil Engineering, Jul 1, 2005

ABSTRACT Modeling and analyzing construction operations using simulation techniques allows resear... more ABSTRACT Modeling and analyzing construction operations using simulation techniques allows researchers to capture the uncertainty and randomness usually associated-with these operations and can thus be an effective tool for analysis and improvement. However, the effort and knowledge required to build simulation models and experiment with them tend to limit the use of simulation in construction. A common recommendation for removing this obstacle found in the literature leans towards developing simulation tools that reduce model development and experimentation time on the construction engineer's side by-packaging most of the knowledge required into the tool itself. Such "intelligent" simulation modeling tools may significantly impact the way construction engineers use simulation techniques in day-to-day decision making. This paper presents a framework that extends and formalizes this recommendation by providing the foundation for building intelligence into simulation objects. The proposed framework provides the structure necessary for building intelligence and autonomy into simulation objects and permits,a further reduction in the knowledge required to experiment with simulation models. This approach also automates model modification, not only through changes in numeric parameters, but through topological model changes as well, which may assist the model user in making. marry decisions throughout the different phases of simulation experimentation.

Irrig Drain, 2009

The underperformance problem of large-scale irrigation systems particularly in developing countri... more The underperformance problem of large-scale irrigation systems particularly in developing countries, has adversely affected levels of production of those systems. The fact that these irrigation systems are not managed in response to their performance has been identified as the main reason behind their malfunctioning. A performance-oriented management approach is demonstrated here to help irrigation system managers take the right decisions, through continuous in-season performance assessment. The Advanced Very High Resolution Radiometer satellite images of the National Oceanic and Atmospheric Administration (NOAA-AVHRR) for the year 2000, complemented by water release data, were used to assess the performance of the Rahad irrigation scheme, Sudan (126 000 ha), on a 10-day time step. The Surface Energy Balance Algorithm (SEBAL) was used to process the NOAA-AVHRR images. The decisions on irrigation water allocation are guided by maps of the relative water supply and soil moisture content generated for the last time step. Further decision support could be realized using the performance indicators of the system and the soil water balance for the given time step.

2012 IEEE PES Innovative Smart Grid Technologies (ISGT), 2012

ABSTRACT

Careful and economic design of stilling basins is a major factor when considering design of hydra... more Careful and economic design of stilling basins is a major factor when considering design of hydraulic structures such as barrages, weir, spillways, …, etc. Recently, the non-prismatic stilling basins attracted many researchers due to its effective dissipation of excess energy. Radial stilling basins are characterizing with symmetric flow patterns that in turn minimize the expected damages of the erodible bed downstream the stilling basins. In this paper, the submerged flow in radial stilling basin provided with negative step and an end sill is analyzed both theoretically and experimentally. The effects of various parameters such as submergence, relative height of sill, relative height of step and inlet Froude number are presented and discussed. The experimental study is conducted on 30 cm wide, 45 cm deep and 12 m long open channel. The theoretical study utilizes the onedimensional momentum and continuity equations. The developed equations are verified using the obtained experimental data. Also, prediction models to estimate the length of jump are developed using the dimensional analysis and statistical methods. The models are calibrated and verified using the experimental data.

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

2010 Second International Conference on Advances in System Simulation, 2010

Modular construction is a common practice for building industrial plants, particularly in the oil... more Modular construction is a common practice for building industrial plants, particularly in the oil sands region of Alberta, Canada. Each module is a project with its own activities and constraints. These modules are prefabricated offsite, at a location called the module assembly yard, and then shipped to the site. Effective scheduling of modules of an industrial plant involves developing a realistic schedule that makes best use of limited resources in the yard while satisfying the constraints and uncertainties of the entire project. Scheduling such large-scale, multi-unit projects using commercial CPM-based scheduling applications (e.g. Primavera, Microsoft Project) is not effective. In previous work, we have introduced a hybrid framework, called Simulation-Based Auction Protocol (SBAP), for effective resource scheduling in largescale projects. The present study employs the SBAP framework for effective allocation of resources (e.g. space, skilled crew) and for satisfaction of various constraints. This system pulls data from a comprehensive database, runs the simulation model behind the scenes, and generates various graphical reports to aid superintendents and project managers in pertinent project decisions. The developed system is also capable of scheduling the fast-track modular A c c e p t e d M a n u s c r i p t N o t C o p y e d i t e d 2 construction projects with limited data available, doing effective resource leveling, and

IEEE Transactions on Power Systems, 2015

ABSTRACT

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997

A new resource allocation scheme suitable for the high bit rate radio LAN was developed. The sche... more A new resource allocation scheme suitable for the high bit rate radio LAN was developed. The scheme is an adaptive one which allocates a portion of the available bandwidth only to those users who are active. The scheme is given the name Linked cluster Graph theoretic Multiple Access (LGMA). The scheme places the nodes of an ad hoc network in

J Manage Eng, 2009

The importance of integrating construction knowledge into the design process has long been recogn... more The importance of integrating construction knowledge into the design process has long been recognized by the construction industry. This paper studies early contractor involvement in design and its impact on construction schedule performance through a ...

Ieee Transactions on Power Electronics, 2007

J Constr Eng Manage Asce, 2005

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving th... more The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving the management of radioactive sealed sources (RSSs) in Egypt. When completed, IMPRSS will protect the people and the environment from another radioactive incident. The ...

The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving th... more The Integrated Management Program for Radioactive Sealed Sources (IMPRSS) is greatly improving the management of radioactive sealed sources (RSSs) in Egypt. When completed, IMPRSS will protect the people and the environment from another radioactive incident. The ...

Proceedings of the 40th Conference, 2008

Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distribu... more Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distributing a number of resources amongst multiple agents. This field has interdisciplinary characteristics and relates to a wide range of applications, such as industrial procurement, scheduling and network routing. Many construction operations involve entities sharing and competing for limited resources. The decision to allocate these resources to entities usually has a significant impact on the schedule and cost of these operations. The dynamic and continuously changing nature of construction operations justifies the need for decision support tools with high adaptability and handling of uncertainty which is featured by MARA. This paper presents the main elements and techniques in MARA and discusses a sample case applying these techniques for the modeling of industrial construction assembly processes, also presents the conceptual model of the sample case and a prototype implementation of that model using Repast multi-agent simulation package.

Proceedings of the 40th Conference, 2008

Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distribu... more Multi-Agent Resource Allocation (MARA) is a field developing solutions to the problem of distributing a number of resources amongst multiple agents. This field has interdisciplinary characteristics and relates to a wide range of applications, such as industrial procurement, scheduling and network routing. Many construction operations involve entities sharing and competing for limited resources. The decision to allocate these resources to entities usually has a significant impact on the schedule and cost of these operations. The dynamic and continuously changing nature of construction operations justifies the need for decision support tools with high adaptability and handling of uncertainty which is featured by MARA. This paper presents the main elements and techniques in MARA and discusses a sample case applying these techniques for the modeling of industrial construction assembly processes, also presents the conceptual model of the sample case and a prototype implementation of that model using Repast multi-agent simulation package.

Journal of Construction Engineering and Management, Mar 1, 2011

Journal of Construction Engineering and Management, Mar 1, 2011

Journal of Computing in Civil Engineering, Jul 1, 2005

ABSTRACT Modeling and analyzing construction operations using simulation techniques allows resear... more ABSTRACT Modeling and analyzing construction operations using simulation techniques allows researchers to capture the uncertainty and randomness usually associated-with these operations and can thus be an effective tool for analysis and improvement. However, the effort and knowledge required to build simulation models and experiment with them tend to limit the use of simulation in construction. A common recommendation for removing this obstacle found in the literature leans towards developing simulation tools that reduce model development and experimentation time on the construction engineer's side by-packaging most of the knowledge required into the tool itself. Such "intelligent" simulation modeling tools may significantly impact the way construction engineers use simulation techniques in day-to-day decision making. This paper presents a framework that extends and formalizes this recommendation by providing the foundation for building intelligence into simulation objects. The proposed framework provides the structure necessary for building intelligence and autonomy into simulation objects and permits,a further reduction in the knowledge required to experiment with simulation models. This approach also automates model modification, not only through changes in numeric parameters, but through topological model changes as well, which may assist the model user in making. marry decisions throughout the different phases of simulation experimentation.

Journal of Computing in Civil Engineering, Jul 1, 2005

ABSTRACT Modeling and analyzing construction operations using simulation techniques allows resear... more ABSTRACT Modeling and analyzing construction operations using simulation techniques allows researchers to capture the uncertainty and randomness usually associated-with these operations and can thus be an effective tool for analysis and improvement. However, the effort and knowledge required to build simulation models and experiment with them tend to limit the use of simulation in construction. A common recommendation for removing this obstacle found in the literature leans towards developing simulation tools that reduce model development and experimentation time on the construction engineer's side by-packaging most of the knowledge required into the tool itself. Such "intelligent" simulation modeling tools may significantly impact the way construction engineers use simulation techniques in day-to-day decision making. This paper presents a framework that extends and formalizes this recommendation by providing the foundation for building intelligence into simulation objects. The proposed framework provides the structure necessary for building intelligence and autonomy into simulation objects and permits,a further reduction in the knowledge required to experiment with simulation models. This approach also automates model modification, not only through changes in numeric parameters, but through topological model changes as well, which may assist the model user in making. marry decisions throughout the different phases of simulation experimentation.

Irrig Drain, 2009

The underperformance problem of large-scale irrigation systems particularly in developing countri... more The underperformance problem of large-scale irrigation systems particularly in developing countries, has adversely affected levels of production of those systems. The fact that these irrigation systems are not managed in response to their performance has been identified as the main reason behind their malfunctioning. A performance-oriented management approach is demonstrated here to help irrigation system managers take the right decisions, through continuous in-season performance assessment. The Advanced Very High Resolution Radiometer satellite images of the National Oceanic and Atmospheric Administration (NOAA-AVHRR) for the year 2000, complemented by water release data, were used to assess the performance of the Rahad irrigation scheme, Sudan (126 000 ha), on a 10-day time step. The Surface Energy Balance Algorithm (SEBAL) was used to process the NOAA-AVHRR images. The decisions on irrigation water allocation are guided by maps of the relative water supply and soil moisture content generated for the last time step. Further decision support could be realized using the performance indicators of the system and the soil water balance for the given time step.

2012 IEEE PES Innovative Smart Grid Technologies (ISGT), 2012

ABSTRACT

Careful and economic design of stilling basins is a major factor when considering design of hydra... more Careful and economic design of stilling basins is a major factor when considering design of hydraulic structures such as barrages, weir, spillways, …, etc. Recently, the non-prismatic stilling basins attracted many researchers due to its effective dissipation of excess energy. Radial stilling basins are characterizing with symmetric flow patterns that in turn minimize the expected damages of the erodible bed downstream the stilling basins. In this paper, the submerged flow in radial stilling basin provided with negative step and an end sill is analyzed both theoretically and experimentally. The effects of various parameters such as submergence, relative height of sill, relative height of step and inlet Froude number are presented and discussed. The experimental study is conducted on 30 cm wide, 45 cm deep and 12 m long open channel. The theoretical study utilizes the onedimensional momentum and continuity equations. The developed equations are verified using the obtained experimental data. Also, prediction models to estimate the length of jump are developed using the dimensional analysis and statistical methods. The models are calibrated and verified using the experimental data.

Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ..... more Development of intermediate-depth borehole disposal for unwanted radioactive sources in Egypt. ... Conference: Proposed for presentation at the Waste Mangement'05 Symposium held February 27-March 3, 2005 in Tucson, AZ.

2010 Second International Conference on Advances in System Simulation, 2010

Modular construction is a common practice for building industrial plants, particularly in the oil... more Modular construction is a common practice for building industrial plants, particularly in the oil sands region of Alberta, Canada. Each module is a project with its own activities and constraints. These modules are prefabricated offsite, at a location called the module assembly yard, and then shipped to the site. Effective scheduling of modules of an industrial plant involves developing a realistic schedule that makes best use of limited resources in the yard while satisfying the constraints and uncertainties of the entire project. Scheduling such large-scale, multi-unit projects using commercial CPM-based scheduling applications (e.g. Primavera, Microsoft Project) is not effective. In previous work, we have introduced a hybrid framework, called Simulation-Based Auction Protocol (SBAP), for effective resource scheduling in largescale projects. The present study employs the SBAP framework for effective allocation of resources (e.g. space, skilled crew) and for satisfaction of various constraints. This system pulls data from a comprehensive database, runs the simulation model behind the scenes, and generates various graphical reports to aid superintendents and project managers in pertinent project decisions. The developed system is also capable of scheduling the fast-track modular A c c e p t e d M a n u s c r i p t N o t C o p y e d i t e d 2 construction projects with limited data available, doing effective resource leveling, and

IEEE Transactions on Power Systems, 2015

ABSTRACT

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion, 1997

A new resource allocation scheme suitable for the high bit rate radio LAN was developed. The sche... more A new resource allocation scheme suitable for the high bit rate radio LAN was developed. The scheme is an adaptive one which allocates a portion of the available bandwidth only to those users who are active. The scheme is given the name Linked cluster Graph theoretic Multiple Access (LGMA). The scheme places the nodes of an ad hoc network in