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Search Results: 1 - 10 of 464096 matches for " Hosny A. Abbas "
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Efficient Web-Based SCADA System
Hosny A. Abbas
Computer Science , 2015,
Abstract: Computer-based supervisory control and data acquisition (SCADA) systems have evolved over the past four decades, from standalone, compartmentalized operations into networked architectures that communicate across large distances. There is an emerging trend comprising SCADA and conventional IT units toward consolidating some overlapping activities. This trend is motivated by cost savings achieved by consolidating disparate platforms, networks, software, and maintenance tools. For reasons of efficiency, maintenance, economics, data acquisition, control platforms have migrated from isolated in-plant networks using proprietary hardware and software to PC-based systems using standard software, network protocols, and the Internet. In this thesis, we present an approach for web-based SCADA systems that adapt to the behavior of the target application. In addition, we take into account the real time constraints that imposed by the nature of the problem. We show that our approach is more efficient than other approaches in terms of consuming as little as possible of the available resources (computational power and network bandwidth).
Review on the Design of Web Based SCADA Systems Based on OPC DA Protocol
Hosny A. Abbas,Ahmed M. Mohamed
Computer Science , 2015,
Abstract: One of the most familiar SCADA (supervisory control and data acquisition) application protocols now is OPC protocol. This interface is supported by almost all SCADA, visualization, and process control systems. There are many research efforts tried to design and implement an approach to access an OPC DA server through the Internet. To achieve this goal they used diverse of modern IT technologies like XML, Web services, Java and AJAX. In this paper, we present a complete classification of the different approaches introduced in the literature. A comparative study is also introduced. Finally we study the feasibility of the realization of these approaches based on the real time constraints imposed by the nature of the problem.
Simple, Flexible, and Interoperable SCADA System Based on Agent Technology
Hosny A. Abbas,Samir I. Shaheen,Mohammed H. Amin
Computer Science , 2015,
Abstract: SCADA (Supervisory Control and Data Acquisition) is concerned with gathering process information from industrial control processes found in utilities such as power grids, water networks, transportation, manufacturing, etc., to provide the human operators with the required real-time access to industrial processes to be monitored and controlled either locally (on-site)or remotely (i.e., through Internet). Conventional solutions such as custom SCADA packages, custom communication protocols, and centralized architectures are no longer appropriate for engineering this type of systems because of their highly distribution and their uncertain continuously changing working environments. Multi-agent systems (MAS) appeared as a new architectural style for engineering complex and highly dynamic applications such as SCADA systems. In this paper, we propose an approach for simply developing flexible and interoperable SCADA systems based on the integration of MAS and OPC process protocol. The proposed SCADA system has the following advantages: 1) simple (easier to be implemented); 2) flexible (able to adapt to its environment dynamic changes); and 3) interoperable (relative to the underlying control systems, which belongs to diverse of vendors). The applicability of the proposed approach is demonstrated by a real case study example carried out in a paper mill.
On the Adoption of Multi-Agent Systems for the Development of Industrial Control Networks
Hosny A. Abbas,Samir I. Shaheen,Mohammed H. Amin
Computer Science , 2015,
Abstract: Multi-Agent Systems (MAS) are adopted and tested with many complex and critical industrial applications, which are required to be adaptive, scalable, context-aware, and include real-time constraints. Industrial Control Networks (ICN) are examples of these applications. An ICN is considered a system that contains a variety of interconnected industrial equipments, such as physical control processes, control systems, computers, and communication networks. It is built to supervise and control industrial processes. This paper presents a development case study on building a multi-layered agent-based ICN in which agents cooperate to provide an effective supervision and control of a set of control processes, basically controlled by a set of legacy control systems with limited computing capabilities. The proposed ICN is designed to add an intelligent layer on top of legacy control systems to compensate their limited capabilities using a cost-effective agent-based approach, and also to provide global synchronization and safety plans. It is tested and evaluated within a simulation environment. The main conclusion of this research is that agents and MAS can provide an effective, flexible, and cost-effective solution to handle the emerged limitations of legacy control systems if they are properly integrated with these systems.
Simple, Flexible, and Interoperable SCADA System Based on Agent Technology  [PDF]
Hosny Abbas, Samir Shaheen, Mohammed Amin
Intelligent Control and Automation (ICA) , 2015, DOI: 10.4236/ica.2015.63018
Abstract: SCADA (Supervisory Control and Data Acquisition) is concerned with gathering process information from industrial control processes found in utilities such as power grids, water networks, transportation, manufacturing, etc., to provide the human operators with the required real-time access to industrial processes to be monitored and controlled either locally (on-site)or remotely (i.e., through Internet). Conventional solutions such as custom SCADA packages, custom communication protocols, and centralized architectures are no longer appropriate for engineering this type of systems because of their highly distribution and their uncertain continuously changing working environments. Multi-agent systems (MAS) appeared as a new architectural style for engineering complex and highly dynamic applications such as SCADA systems. In this paper, we propose an approach for simply developing flexible and interoperable SCADA systems based on the integration of MAS and OPC process protocol. The proposed SCADA system has the following advantages: 1) simple (easier to be implemented); 2) flexible (able to adapt to its environment dynamic changes); and 3) interoperable (relative to the underlying control systems, which belongs to diverse of vendors). The applicability of the proposed approach is demonstrated by a real case study example carried out in a paper mill.
MOS-2: A Two-Dimension Space for Positioning MAS Organizational Models
Hosny Abbas,Samir Shaheen
Computer Science , 2015,
Abstract: The increased complexity and dynamism of present and future Multi-Agent Systems (MAS) enforce the need for considering both of their static (design-time) and the dynamic (run-time) aspects. A type of balance between the two aspects can definitely give better results related to system stability and adaptivity. MAS organization is the research area that is concerned with these issues and it is currently a very active and interesting research area. Designing a MAS with an initial organization and giving it the ability to dynamically reorganize to adapt the dynamic changes of its unpredictable and uncertain environment, is the feasible way to survive and to run effectively. Normally, MAS organization is tackled by what is called, MAS organizational models, which are concerned with the description (formally or informally) of the structural and dynamical aspects of agent organizations. This paper proposes a two-dimension space, called MOS-2, for positioning and assessing MAS organizational models based on two dimensions: their adopted engineering viewpoint (agent-centered or organization-centered) as the vertical dimension and the agents awareness/unawareness of the existence of the organizational level as the horizontal dimension. The MOS-2 space is applied for positioning a number of familiar organizational models. Its future trends and possible improvements are highlighted. They include the following, (1) adding Time as a dimension, (2) increasing the considered dimensions, (3) providing a quantitative approach for positioning MAS organizational models.
Review on the Design of Web Based SCADA Systems Based on OPC DA Protocol
Hosny Ahmed Abbas, Ahmed M. Mohamed
International Journal of Computer Networks , 2011,
Abstract: One of the most familiar SCADA (supervisory control and data acquisition)application protocols now is OPC protocol. This interface is supported by almostall SCADA, visualization, and process control systems. There are many researchefforts tried to design and implement an approach to access an OPC DA serverthrough the Internet. To achieve this goal they used diverse of modern ITtechnologies like XML, Webservices, Java and AJAX. In this paper, we present acomplete classification of the different approaches introduced in the litrature. Acomparative study is also introduced. Finally we study the feasibilty of therealization of these approaches based on the real time constraints imposed bythe nature of the problem.
Adaptive Agent-Based SCADA System
Hosny Abbas,Samir Shaheen,Mohammed Amin
Computer Science , 2015,
Abstract: Modern supervisory control and data acquisition (SCADA) systems comprise variety of industrial equipment such as physical control processes, logical control systems, communication networks, computers, and communication protocols. They are concerned with control and supervision of production control processes. Modern SCADA networks contain highly distributed information, control, and location. Moreover, they contain large number of heterogeneous components situated in highly changing and uncertain environments. As a result, engineering modern SCADA is a challenging issue and conventional engineering approaches are no longer suitable for them because of their increasing complexity and highly distribution. In this research, Multi-Agent Systems (MAS) are used to enable building adaptive agent-based SCADA system by modeling system components as agents in the micro level and as organizations or societies of agents in the macro level. A prototype has been implemented and evaluated within a simulation environment for demonstrating the adaptive behavior of the system-to-be, which results in continuous improvement of system performance.
Forearm lengthening
G. A. Hosny
Journal of Orthopaedics and Traumatology , 2005, DOI: 10.1007/s10195-005-0096-3
Abstract: Eleven cases of forearm shortening underwent lengthening using Ilizarov principles. The aetiology was hereditary multiple exostosis in 6 cases, radial club hand in 2 cases, and trauma in 3 cases. Average age at operation was 15.5 years (range, 9–40 years). At an average follow-up of 3.5 years (range, 2–6 years), there were 8 good, 2 fair and one poor results. Achieved lengthening ranged from 2 cm (10% of the original bone length) to 11 cm (110%). The average healing index was 40 days/cm. There were no neurovascular problems. Complications included pin tract infections in all cases, fracture of the regenerated bone in one case, breakage of a half pin in one case and increased carpal subluxation in another case. Combination of Ilizarov method and hybrid fixation provides a relatively safe method of forearm lengthening with possibility of deformity correction and gradual reduction of chronic dislocations.
Organization of Multi-Agent Systems: An Overview
Hosny Ahmed Abbas,Samir Ibrahim Shaheen,Mohammed Hussein Amin
Computer Science , 2015, DOI: 10.11648/j.ijiis.20150403.11
Abstract: In complex, open, and heterogeneous environments, agents must be able to reorganize towards the most appropriate organizations to adapt unpredictable environment changes within Multi-Agent Systems (MAS). Types of reorganization can be seen from two different levels. The individual agents level (micro-level) in which an agent changes its behaviors and interactions with other agents to adapt its local environment. And the organizational level (macro-level) in which the whole system changes it structure by adding or removing agents. This chapter is dedicated to overview different aspects of what is called MAS Organization including its motivations, paradigms, models, and techniques adopted for statically or dynamically organizing agents in MAS.
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