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Systems Journal, IEEE

Issue 4 • Date Dec. 2008

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Displaying Results 1 - 18 of 18
  • [Front cover]

    Publication Year: 2008 , Page(s): C1
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    Freely Available from IEEE
  • IEEE Systems Journal publication information

    Publication Year: 2008 , Page(s): C2
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    Freely Available from IEEE
  • Table of contents

    Publication Year: 2008 , Page(s): 441
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    Freely Available from IEEE
  • A Systems Approach to Corporate Sustainability in Energy Management of Industrial Units

    Publication Year: 2008 , Page(s): 442 - 452
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1279 KB) |  | HTML iconHTML  

    This paper presents a ldquoproof of conceptrdquo system methodology for the energy management of industrial units examining them as socio-technical systems. The cybernetic viable system model (VSM) of Beer is used to consider an industrial unit as a viable organization and through this consideration to diagnose the technical and managerial gaps identifying the Best Interventions Plan according to principles of sustainability. Based on a case study concerning a Fertilizers Production Plant, a framework is developed that could be extensively used for energy management of industrial units. The systems approach of this framework emerges as a unique available tool to implement the principles of sustainability in industrial energy management. View full abstract»

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  • Duty Cycle Analysis to Drive Intelligent Actuator Development

    Publication Year: 2008 , Page(s): 453 - 463
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1535 KB) |  | HTML iconHTML  

    The field of intelligent actuators has been emerging for mechanical systems (aircraft, robots, manufacturing systems, more electric vehicles, human rehabilitation systems, etc.) as the dual of the computer chip for electronic systems. The level of intelligence necessary will be driven by the increasing performance demands for these ever more complex and nonlinear mechanical systems. These demands are best illustrated by actual duty cycles such as that presented here for aircraft control surface actuators. A representative duty cycle is analyzed using four basic methods/objectives that can be applied both in the development of new design requirements and the support of subsequent operational decision making software to maximize performance, provide for fault tolerance, and for condition-based maintenance. Both thermal and durability analyses are conducted yielding results which a prospective designer can use to support design decisions for a wide range of applications including power-by-wire (PBW) aircraft actuators. View full abstract»

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  • Efficient Satellite-Based Sensor Networks for Information Retrieval

    Publication Year: 2008 , Page(s): 464 - 475
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB) |  | HTML iconHTML  

    This paper considers a packet-based telecommunication network architecture suited to be used as an Environmental Monitoring System (EMS) over wide areas. It can be employed to retrieve the measures of physical quantities, such as temperature, humidity, and vibrations intensity (physical information) together with the geographical position where the measures are taken (position information). The telecommunication network supporting the EMS is composed of: a network of sensors, a group of earth stations called Sinks, a satellite backbone, and a destination. Each sensor collects physical and position information, encapsulates it into packets and conveys it towards the sinks which give access to the satellite backbone that connects the sinks to the destination. A single sensor transmits the information to all sinks but only one sink transmits it over the satellite channel. Even if the redundant transmission of the same data from more than one sink would increase the safety of the system, it would increase also the costs of it. The selection of the sink which forwards the information of a sensor to the destination is important to increase the performance of the EMS. This paper introduces specific performance metrics to evaluate the functionality of the whole EMS in terms of reliability, reactivity, and spent energy. The reference metrics are packet loss rate, average packet delay, and energy consumption. Then the paper presents an algorithm to select the transmitting sink for each sensor, which is aimed at maximizing the performance in terms of the mentioned metrics. The algorithm is tested through simulation. View full abstract»

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  • Penalty for Fuel Economy— System Level Perspectives on the Reliability of Hybrid Electric Vehicles During Normal and Graceful Degradation Operation

    Publication Year: 2008 , Page(s): 476 - 483
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB) |  | HTML iconHTML  

    Generally people tend to think only in terms of fuel economy and additional cost premium on vehicle price while discussing about hybrid electric vehicles (HEV). This paper tries to emphasize that the overall acceptability of a vehicle also has to do with its system level reliability. It discusses the issue of system level reliability in hybrid electric vehicles from a quantitative point of view. It also introduces a quantitative meaning to the concept of graceful degradation and mode of operation under graceful degradation condition. All these are discussed in stages, starting from a regular internal combustion engine based vehicle, and later transition of those to hybrid electric vehicles. This paper intends to drive the point that in HEV, one of the penalties for fuel economy that has to be paid comes in terms of reliability. View full abstract»

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  • System-of-Systems Engineering Management: A Review of Modern History and a Path Forward

    Publication Year: 2008 , Page(s): 484 - 499
    Cited by:  Papers (38)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1882 KB) |  | HTML iconHTML  

    As our knowledge of system of systems (SoS) has grown and evolved, so has our understanding of how to engineer and manage them. In systems engineering, we develop architectures and frameworks to bring meaning to this kind of uncertainty, but for SoS engineering (SoSE) we are still in search of how we can structure this understanding. In this paper, we review the SoS literature to illustrate the need to create an SoSE management framework based on the demands of constant technological progress in a complex dynamic environment. We conclude from this review that the history and evolution of defining SoS has shown that: (1) SoS can be defined by distinguishing characteristics and (2) SoS can be viewed as a network where the ldquobest practicesrdquo of network management can be applied to SoSE. We use these two theories as a foundation for our objective to create an effective SoSE management framework. To accomplish this, we utilize modified fault, configuration, accounting, performance, and security (FCAPS) network principles (SoSE management conceptual areas). Furthermore, cited distinguishing characteristics of SoS are also used to present a SoSE management framework. We conclude with a case analysis of this framework using a known and well-documented SoS (i.e., Integrated Deepwater System) to illustrate how to better understand, engineer, and manage within the domain of SoSE. View full abstract»

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  • Web Enabled Wireless Sensor Networks for Facilities Management

    Publication Year: 2008 , Page(s): 500 - 512
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1307 KB) |  | HTML iconHTML  

    The cornerstone of building and overall facilities management is accurate and up-to-date monitoring of the context of the enterprise building environment and its surroundings, usually performed by sensors dispersed throughout the premises. Currently, the majority of building management systems is tightly coupled with the sensors that they utilize, restricting their extensibility. The emergence of Wireless Sensor Networks (WSNs) has brought significant benefits as far as monitoring is concerned, since they are more cost-efficient, due to the lack of wiring installations, compared to wired sensor solutions and allow for flexible positioning of the sensors, especially when building retrofitting is concerned. In line with the established move towards integration of enterprise level services, it is beneficial to consider the WSNs within that scope. In this paper, we propose to exploit a service oriented architecture for developing an enterprise networking environment that is used for integrating facilities management applications and building management systems with other operational enterprise functions for the purpose of information sharing and monitoring, controlling, and managing the enterprise environment. The WSN is viewed as an information service provider not only to building management systems but also to wider applications in the enterprise infrastructure. We provide specification and implementation details of the proposed architecture and discuss evaluation planning. View full abstract»

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  • A Visual Tradeoff Space for Formal Verification and Validation Techniques

    Publication Year: 2008 , Page(s): 513 - 519
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (365 KB) |  | HTML iconHTML  

    Numerous techniques exist for conducting computer-assisted formal verification and validation. The cost associated with these techniques varies, depending on factors such as ease of use, the effort required to construct correct requirement specifications for complex real-world properties, and the effort associated with instrumentation of the software under test. Likewise, existing techniques differ in their ability to effectively cover the system under test and its associated requirements. To aid software engineers in selecting the appropriate technique for the formal verification or validation task at hand, we introduce a three-dimensional tradeoff space encompassing both cost and coverage. View full abstract»

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  • A Simple and Accurate Model for RFID Rectifier

    Publication Year: 2008 , Page(s): 520 - 524
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (551 KB) |  | HTML iconHTML  

    In this paper, a simple model for the UHF low power rectifier circuit is proposed. Using a novel approach to model the rectifier current waveform, simple analytical equations are derived. The output DC voltage and the efficiency of the rectifier are derived analytically. Simulation results of the rectifier using actual models are very close to those predicted by the proposed model. The derived formulas for the output DC voltage and the efficiency are simple and physically meaningful and can be used to optimize the performance of the rectifier. View full abstract»

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  • Supporting Quality-of-Service Scheduling in a TT-FR WDM System

    Publication Year: 2008 , Page(s): 525 - 535
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (824 KB) |  | HTML iconHTML  

    In this paper, our recent work interval-based orderly scheduling strategy (IOSS) is extended by adding quality-of-service (QoS) provisioning. A revised medium access control (MAC) protocol is introduced, which supports priority-based QoS in wavelength division multiplexing (WDM) networks with star topology. The proposed interval-based prioritized orderly scheduling strategy (IPOSS) operates in a distributed manner, and has the capability of handling channel collision and destinations conflicts in order to provide a collision-free scheduling scheme. Each node in the network is equipped with a tunable transmitter and a fixed receiver, assuring that the scheme is scalable with respect to the number of nodes and channels. Also, each node may accept high- and low-priority packet arrivals. IPOSS favors high-priority packets, without regarding packets' length or packets' destination. Moreover, the proposed scheme differentiates the packet's schedule order by prioritizing the long-length over the short-length packets. It is found that the adopted access control scheme achieves a critically high throughput-delay performance for real-time traffic. Furthermore, IPOSS presents a little bit improved throughput performance than IOSS scheme, since it handles in a different way the case in which two or more requests demand the same amount of transmission time. The traffic involved in the simulation results follows Bernoulli and Poisson distribution, regarding the arrival of the requests. View full abstract»

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  • Multi-Objective Optimization Models for Improved Decision-Support in Humanitarian Infrastructure Project Selection Problems

    Publication Year: 2008 , Page(s): 536 - 547
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1537 KB) |  | HTML iconHTML  

    The process by which U.S. military organizations select humanitarian infrastructure projects in host countries is hampered by a lack of quantitative decision-support. Addressing this problem is important because the degree of effectiveness of projects selected and completed significantly impacts geo-political implications for the U.S. and, further, directly impacts the quality of life for citizens in host countries. In this paper, a family of multi-objective optimization problems are formulated and solved to explore quantitative, system-level insights on optimal project groupings and comparisons to historical data. Objective functions are found which produce project groupings that match well with historical data, and the optimization model expresses significant information about the sensitivity of solutions in the decision-space. However, imperfection in the matching as well as insights from sensitivities suggests the need for augmentations to improve upon a single organization, optimization-only model. In particular, the use of agent-based modeling is presented for extended work to capture the unmodeled dynamics in the system. View full abstract»

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  • Call for papers 3rd Annual IEEE International Systems Conference

    Publication Year: 2008 , Page(s): 548 - 549
    Save to Project icon | Request Permissions | PDF file iconPDF (1028 KB)  
    Freely Available from IEEE
  • 2009 IEEE International Conference on System of Systems Engineering (SoSE)

    Publication Year: 2008 , Page(s): 550
    Save to Project icon | Request Permissions | PDF file iconPDF (605 KB)  
    Freely Available from IEEE
  • 2008 Index IEEE Systems Journal Vol. 2

    Publication Year: 2008 , Page(s): 551 - 560
    Save to Project icon | Request Permissions | PDF file iconPDF (88 KB)  
    Freely Available from IEEE
  • IEEE Systems Council Information

    Publication Year: 2008 , Page(s): C3
    Save to Project icon | Request Permissions | PDF file iconPDF (26 KB)  
    Freely Available from IEEE
  • IEEE Systems Journal Information for authors

    Publication Year: 2008 , Page(s): C4
    Save to Project icon | Request Permissions | PDF file iconPDF (34 KB)  
    Freely Available from IEEE

Aims & Scope

The IEEE Systems Journal is created to provide a systems-level focused forum for application-oriented manuscripts that address complex systems and system-of-systems of national and global significance

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Professor Vincenzo Piuri
Università degli Studi di Milano