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    Historical and fundamental developments in control systems

    Bushnell, L.G.
    Control Systems, IEEE

    Volume: 15 , Issue: 3
    DOI: 10.1109/37.387624
    Publication Year: 1995 , Page(s): 90 - 92

    IEEE Journals & Magazines

    The author tries to convey some of the highlights of talks in the first ever “history” session at the 33rd Conference on Decision and Control, Lake Buena Vista, FL, (1994) View full abstract»

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    Power electronics, control of the electromechanical energy conversion process and some applications

    van Wyk, J.D. ; Skudelny, H.-Ch. ; Mÿller-Hellmann, A.
    Electric Power Applications, IEE Proceedings B

    Volume: 133 , Issue: 6
    DOI: 10.1049/ip-b:19860052
    Publication Year: 1986 , Page(s): 369 - 399
    Cited by:  Papers (14)

    IET Journals & Magazines

    Some fundamental considerations regarding power electronics and machine electronics are discussed. The historical development of ideas in this field is examined, the applications in the field of electric traction for rail vehicles are summarised and possible future developments are outlined. A systematic approach to power electronics, based upon the control of energy flow in switching convertors, is presented. This approach takes into consideration the different possible switching functions, the modulation functions, the realisation of these switching and modulation functions, the realisation of these switching and modulation functions by practical power semiconductor switches and the different classes of forced turn-off and commutation in power electronic circuits. Subsequently the concepts of topology and structure are defined, leading to different generic topologies for singular convertors. The structure of the five different families of composite convertors are examined, and practical examples are given. The systematic approach to machine electronics presented in the paper is based on a power flow model, using the unifying concept of rotating field theory. In combination with previously defined systematics for power electronics, this enables a systematic approach to the different classes of variable speed drives, based on power flow considerations. The historical developments of some power electronic and machine electronic ideas are traced, starting at the beginning of this century. Since the introduction of power semiconductor switches, applications of the older ideas have increased exponentially in all fields, making it impossible to cover all of them. As a consequence the development of power electronics and control of machines by electronic convertors in the field of electric traction is discussed in some detail, because this represents a record of important engineering achievements in this field. In conclusion, the present state and future trends of power a- nd machine electronics are examined. This evaluation covers the development in the field of switching devices regarding the improvement of interfacing between signal and power electronics, the decrease of switching transition times, the reduction of device losses during conduction, and device developments for decreasing energy storage devices in convertors. The development of power electronic convertors for the reduction of the number of components in the topology and the development of convertors with a high frequency link are then covered, related to the expected development of switching devices. New directions of development regarding the electronic conditioning of the electromechanical energy conversion process concerning the elimination of undesirable effects and losses are important. The implementation of these trends by utilising the improved switching characteristics of power electronic switches and the information processing capability of microprocessors is discussed. This is then extended toward control aspects, where both these characteristics enable solutions not possible hitherto. Field control of AC machines imparts control characteristics equal to, or better than, those obtainable with DC machines to the systems, while the processing capability of microprocessors allows the configuration of adaptive machine electronic systems. Finally attention is given to the interfacing of power electronic and machine electronic systems to the power supply network. If the exponential growth of the installed capacity of equipment in the future is to be handled, active compensation of the distorted currents drawn from the supply by this equipment will have to be considered seriously. View full abstract»

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    Analysis and synthesis of dynamic performance of industrial organizations--The application of feedback control techniques to organizational systems

    Wilcox, R.
    Automatic Control, IRE Transactions on

    Volume: 7 , Issue: 2
    DOI: 10.1109/TAC.1962.1105423
    Publication Year: 1962 , Page(s): 55 - 67
    Cited by:  Papers (1)

    IEEE Journals & Magazines

    In this paper a method is described for evaluating the dynamic performance of the operation of an organization. It is shown that the performance response of past efforts can be expressed mathematically by means of performance operators leading to the development of a mathematical model of the process of industrial operations. This paper considers the operation of an engineering organization as a dynamic system and shows that the organization may be treated as a feedback control system with all control techniques of analysis and synthesis applied. Industrial organizations are complex systems of integrated functional departments, sections, and groups. Management control is obtained by functional capability and feedback. The operation of producing a desired design and product represents a multi-loop feedback control system. Feedback provides a continuous measurement of the actual performance as the design and fabrication of the product progresses; the actual progressive accomplishment is compared to the requirements of the job. Control is obtained by means of the corrective action taken to reduce the deviation between the actual and desired result. The science of automatic control analysis as applied to engineering organizations is directly analogous to that applied to the weapon and industrial process control systems. A key measure of performance for a specific output requirement of a design or product is the relation of progressive accomplishment versus time. Accomplishment is measured by means of a number of relations, such as, degree of completion, man-months of effort, or cost to produce. Time of project performance is measured in weeks or months. The historical data of accomplishment versus time provide the dynamic performances of the functional departments as subsystems. These dynamic performance characteristics are analyzed and transformed into mathematical operators or transfer functions. Block diagrams of the integrated and cooperating project groups provide a picture of the organizational system. Feedback is predominant in such a system. A well-trained and efficiently operating organization may be considered as a complex machine. The combination of block diagrams and subsystem transfer functions provide a mathematical model of the organiz- ation and a basis for synthesis as used in feedback control systems. Examples of the above procedure are demonstrated by the use of specific case histories of a number of projects. Fundamental considerations are given of the application of time lags, dead time, lead compensation, linearity, non-linearity, sampled data, adaptive control, stability, etc., using transient and frequency response techniques. The application of synthesis indicates the measures to be taken by management to improve the organizational structure and its performance. For instance, the effects of reducing dead time, of operating as a project group versus functional groups, and of sampling performance on a weekly rather than monthly basis are explicitly investigated. The result of the dynamic analysis of organizational systems represents a new tool using known techniques for management control in the real technological sense. View full abstract»

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    Radar System Performance Charts

    Barton, D.K.
    Military Electronics, IEEE Transactions on

    Volume: 9 , Issue: 3
    DOI: 10.1109/TME.1965.4323217
    Publication Year: 1965 , Page(s): 255 - 263

    IEEE Journals & Magazines

    The fundamental limits to radar performance in search and tracking can be expressed on three charts, in terms of products involving transmitted power, antenna gain, and effective aperture area. Locations of past and present radar systems on these charts disclose evolutionary trends in system design and indicate regions of practical and economic balance between transmitter and antenna complexity, in terms of ratios of power to gain and aperture. The basis of choice for operating frequency is clarified for different applications of radar, such as air surveillance, precision tracking, weapon control, and combinations of these tasks. It is suggested that these historical trends, derived from a large sample of successful radar systems, will furnish a better guide to economic optimization than will empirical cost equations. They are also helpful in comparing diverse approaches to radar system design, and in estimating the dependence of proposed systems upon new component and technique developments. The examples used in this paper are drawn primarily from ground-based radar systems, and serve to clarify the relationships between conventional and phased-array radar systems used for aircraft and missile detection, tracking, and weapon control. View full abstract»

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    Power electronic converters for motion control

    van Wyk, J.D.
    Proceedings of the IEEE

    Volume: 82 , Issue: 8
    DOI: 10.1109/5.301683
    Publication Year: 1994 , Page(s): 1164 - 1193
    Cited by:  Papers (14)

    IEEE Journals & Magazines

    The historical development of power electronic converters to control electrical machines is traced up to the present state of the technology. The fundamental possibilities to control average power in a switching mode are considered and the concepts switching function, converter topology and converter structure defined. A systematic approach to developing more complicated topologies and structures for singular and composite converters is discussed and application to motion control systems given. A functional classification of motion control converters is also related to the switching nature of the power processing, illustrating the fundamental dilemma of this kind of highly efficient power control. The different control possibilities of using power electronic converters with electrical machines in motion control applications (DC drives, AC drives) are reviewed systematically. The paper does not attempt to compile a comprehensive list of all possible converter circuits and variations but focusses on generic issues and technologies. The switching technology in converters and its limitations is related to snubberless, snubbed, and resonant transition-type operation, with reference also to switch drive and converter protection technology. Some future generic possibilities related to electromagnetic integration of switching converters are discussed, also in relation to a motion control application View full abstract»

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    Development and integration of a novel IP66 Force Feedback Joystick for offshore operations

    Scaradozzi, D. ; Sorbi, L. ; Zingaretti, S. ; Biagiola, M. ; Omerdic, E.
    Control and Automation (MED), 2014 22nd Mediterranean Conference of

    DOI: 10.1109/MED.2014.6961449
    Publication Year: 2014 , Page(s): 664 - 669

    IEEE Conference Publications

    Intervention activities in underwater environments are of great importance in many areas, such as the exploration, monitoring and documentation of sea resources, historical treasures or industrial applications. The use of robotic systems and automatic procedures is becoming fundamental, since the work conditions for divers are risky and often unfeasible, and several kind of works are every way impossible for humans. One of the most important objectives of the underwater robotic research consists in making technological systems friendly and easy to use by all kind of experts. This paper presents the development and test of a Force Feedback (FFB) Joystick aimed at supporting ROVs pilots during their work. Reaction forces on the joystick axes, based on specific error parameters, let the pilot understand in real-time the underwater environment where the robot is moving and thruster velocity saturation limits, thus improving significantly the efficiency of the given mission. The present work describes the design, assembly and programming of the joystick, and its test within a virtual environment simulating the real time control of Internet-enabled smart ROVs operating in remote locations. Results obtained with this kind of applications are discussed, and potentiality of the systems are underlined for future developments. View full abstract»

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    Variable-Speed a.c. Drives with Slip-Ring Induction Machines and a Resistively Loaded Force Commutated Rotor Chopper

    van Wyk, J.D.
    Electric Power Applications, IEE Journal on

    Volume: 2 , Issue: 5
    DOI: 10.1049/ij-epa.1979.0025
    Publication Year: 1979 , Page(s): 149 - 160

    IET Journals & Magazines

    The paper deals with variable-speed drives using an induction machine with wound rotor, controlled by variation of an external rotor resistor by a parallel electronic chopper. After tracing the historical development of this type of controlled drive, the power-flow relationships are investigated to arrive at the fundamental characteristics of this type of system. Considerations leading to the selection of a variable-slip system with rotor control rather than stator control are covered, leading to a discussion of the structure for a simple variable-speed drive using a force-commutated rotor chopper. The system is modelled by idealising the power switches and analysing their behaviour as function of slip, and the switched induction machine is modelled by a torque directly proportional to chopper input current. A second-order total system model is arrived at by taking only a speed-loop time constant and a mechanical time constant into account. Particular attention is given to establishing design relationships for this kind of drive. Component ratings, rotor resistor value and commutation requirements are related to operational requirements such as maximum slip, minimum torque, rated current and minimum expected current. No detail of power-chopper design is given. Some practical characteristics of typical variable-speed drives in the 11 kW to 22 kW range arc presented to illustrate the validity of the approach taken in analysis and design. These results indicate that the simple analysis presented is adequate for understanding and predicting the steady-state behaviour of the system. The second-order model gives sufficient accuracy in predicting dynamic behaviour to be useful for the design of systems in the response range normally applicable to this type of drive in practice. When designing systems for fast dynamic response, the modelling will have to be improved. View full abstract»

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    Semiconductor nanowires: A platform for nanoscience and nanotechnology

    Lieber, Charles M.
    Nanoelectronics Conference (INEC), 2010 3rd International

    DOI: 10.1109/INEC.2010.5424478
    Publication Year: 2010 , Page(s): 5 - 6

    IEEE Conference Publications

    Nanoscience offers the promise of producing revolutionary advances in many areas of science and technology, ranging from electronics and computing to biology and medicine, yet the realization of this promise will depend critically on the rational development of unique nanoscale structures whose properties and/or function are controlled during materials synthesis. This review will illustrate these concepts using nanowires as a platform material. First, a brief historical perspective on emergence of nanowires as a central material will be presented. Second, the `chemical' synthesis, atomic-level structural characterization and properties of complex modulated nanowires will be discussed with an emphasis on structures with radial and axial dopant modulation, and novel but controlled structural modulations. The implementation of these functional nanowires as a platform for investigating fundamental properties and performance limits of nanoscale quantum electronic and photovoltaic devices at the single nanowire level will be described. Second, the development of active interfaces between nanowire nanoelectronic devices and biological systems will be discussed, including label-free electronic detection at the single molecule level and multiplexed recording from individual cells through complex biological tissue, such as the brain. In addition, the development of novel nanowire probes that exploit unique synthetic capabilities for the nanowire platform and move beyond capabilities of conventional electrophysiological techniques will be discussed. Last, a critical look at progress made and scientific challenges that remain to realize true technologies in the future will be reviewed. View full abstract»

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    Robotics education for engineering and computer science students in the University of Michigan-Dearborn

    Orady, E.A. ; Dixon, J.R.
    Frontiers in Education Conference, 1988., Proceedings

    DOI: 10.1109/FIE.1988.34957
    Publication Year: 1988 , Page(s): 65 - 69

    IEEE Conference Publications

    The course objectives, contents, laboratory facilities, student projects, and experience gained in teaching are described for an industrial robotics course, a three-credit junior-level undergraduate elective course. The course objectives are directed towards introducing students to the basics of industrial robots with the following emphasis: the historical development of industrial robots and their impact on automation and the factory of the future; the fundamental technology of robots, including robot configurations, drive systems, control systems and precision of motion; types of end effectors and selection criteria based on applications; robot sensors and their role and usage in automated robot work cells; robot programming i.e., leadthrough and textual programming methods; design of robot work cells, and introduction to basic applications of robots in industry View full abstract»

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    α-β target tracking systems: a survey

    Kalata, Paul R.
    American Control Conference, 1992

    Publication Year: 1992 , Page(s): 832 - 836
    Cited by:  Papers (3)  |  Patents (2)

    IEEE Conference Publications

    This paper is a survey of the α-β target tracking process: historical developments and significant estimation and control concepts. The α-β filter is a popular algorithm for radar/target tracking and is often integrated with missile intercept systems. The algorithm is simple: virtually anyone can understand its operation, use it and it works virtually all the time. With this premise, this survey paper addresses fundamental control concepts such as stability, noise reduction, transient response, order reduction, maneuver idenification, noise estimation, track fusion, prediction/smoothing and adaptive tracking. As a survey guide, this paper considers the following questions: Where/when was the first significant reported α-β target tracker and what was its technical message? Why do Radar/Systems Engineers like to use the α-β target tracker? How do Radar/Systems Engineers view the α-β target tracker function? How do Control Engineers view the α-β target tracker function? One of the first relationship found between the α and β parameters was β=α2/(2-α); how many other relationships are there and which one is right? The noise reduction ratio is a useful performance measure; what simple performance does optimal target tracker have? Can one improve the α-β target tracker performance? And if so, how much of an improvement? Can the α-β target tracker be self-tuned? Can multiple α-β target trackers be efficiently fused? View full abstract»

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    Heating systems for gravity based offshore LNG tank concrete structures

    Hoy, D.S. ; Chakkalakal, F. ; Beres, J.
    Petroleum and Chemical Industry Conference, 2005. Industry Applications Society 52nd Annual

    DOI: 10.1109/PCICON.2005.1524550
    Publication Year: 2005 , Page(s): 141 - 149

    IEEE Conference Publications

    The increased focus on LNG as a vital part of the energy equation around the world has resulted in the development of new concepts for the export, reception, storage, and vaporization of LNG. The offshore located gravity based structures significantly differ from historical methods of cryogenic gas storages, and therefore the heating systems have to be carefully evaluated and selected as its purpose and design differs from that of traditional land-based cryogenic tank base heating systems. This paper offers a brief review of design fundamentals and refers to the latest tools in design such as 3D finite element analysis and other such analytical tools. The paper also offers insights into the application of skin effect heat management systems for heating the offshore gravity based structures. The introduction of cutting-edge technologies in temperature control and monitoring is also introduced as a means of delivering optimum heating to the LNG tanks located on these structures. View full abstract»

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    Meeting the challenge of military avionics procurement in beyond the end of the century

    Grimes, V.H. ; Willis, L.T.
    Southeastcon '96. Bringing Together Education, Science and Technology., Proceedings of the IEEE

    DOI: 10.1109/SECON.1996.510144
    Publication Year: 1996 , Page(s): 608 - 617

    IEEE Conference Publications

    The military avionics procurement system is increasingly challenged to deliver sufficient quantity and performance in avionics to meet a wide variety of operational user requirements. This paper traces the development of military avionics over the past forty years to provide a historical perspective of the process. The authors conducted an extensive review of user requirements for selected fixed and rotary wing aircraft assigned to the U.S. Air Force and Army. This study lead to the development of a two-tiered approach to aircraft avionics. The core avionics package (CAP) provides the capabilities required of all aircraft. Extended avionics packages (EAPs) are sensor packages that use the services of the CAP to meet the full user requirement. The authors address several of the challenges that must be met to implement a new approach towards the development of military avionics. They recommend additional study of two fundamental concepts in the Department of Defense (DOD) avionics acquisition process View full abstract»

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    Instrument Landing Systems

    Sanders, L. ; Fritch, V., Jr.
    Communications, IEEE Transactions on

    Volume: 21 , Issue: 5
    DOI: 10.1109/TCOM.1973.1091710
    Publication Year: 1973 , Page(s): 435 - 454

    IEEE Journals & Magazines

    A historical background of instrumental approach and landing equipment for aircraft is given beginning with post-World War I efforts of J. D. Doolittle and emphasizing military-civil standardization efforts that began in 1948 and are continuing. The inadequacies of the current Instrument Landing System (ILS) are detailed and the various efforts of special committees to define an eventual replacement system are described. These committees include the Radio Technical Commission for Aeronautics (RCTA), Special Committee SC-117; the NATO Industrial Advisory Group (NIAG) Subgroup (SG-1); and the International Civil Aviation Organization, All Weather Panel (ICAOAWOP). A five-year national plan for development of a Microwave Landing System (MLS) is being carried out under the leadership of the FAA. The goals of the MLS program are stated and discussed. A number of the fundamental issues on system requirements and system design that were decided by the RTCA are described with their alternates. These issues include the use of air-derived data for extracting aircraft position data; the use of precision distance measuring equipment (DME); the requirement to provide flare-out guidance; and the establishment of a two-band approach using frequencies in theCand Kubands. An important issue not resolved was the selection of a technique for providing precision angular measurement of aircraft position. Two approaches are defined: scanning beam and Doppler technique. The basic configuration of a generic MLS is given to establish those functions that are common to both scanning beam and Doppler techniques. The two techniques are then compared in detail to show the advantages and disadvantages of each. The on-going MLS program has as a basic objective the resolution of this issue. View full abstract»

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    The inverted pendulum: A fundamental benchmark in control theory and robotics

    Boubaker, O.
    Education and e-Learning Innovations (ICEELI), 2012 International Conference on

    DOI: 10.1109/ICEELI.2012.6360606
    Publication Year: 2012 , Page(s): 1 - 6

    IEEE Conference Publications

    For at least fifty years, the inverted pendulum has been the most popular benchmark, among others, for teaching and researches in control theory and robotics. This paper presents the key motivations for the use of that system and explains, in details, the main reflections on how the inverted pendulum benchmark gives an effective and efficient application. Several real experiences, virtual models and web-based remote control laboratories will be presented with emphasis on the practical design implementation of this system. A bibliographical survey of different design control approaches and trendy robotic problems will be presented through applications to the inverted pendulum system. In total, 150 references in the open literature, dating back to 1960, are compiled to provide an overall picture of historical, current and challenging developments based on the stabilization principle of the inverted pendulum. View full abstract»

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    Role of the town and country planning system in controlling development of electricity generating installations

    Kellett, J.E.
    Science, Measurement and Technology, IEE Proceedings A

    Volume: 140 , Issue: 1
    Publication Year: 1993 , Page(s): 94 - 99

    IET Journals & Magazines

    As all current methods of electricity generation imply the use of land and produce a range of environmental impacts it is inevitable that the provisions of the various town and country planning acts shall be brought to bear on decisions about the development of new power generation facilities. The author sets out the fundamentals of the system and seeks to explain the roles of central and local government in the decision making process. The essentially political nature of decision making is described as resting on a range of legislative requirements, central government advice, locally generated and centrally approved plans and informal policy. The purpose and role of land use zoning is discussed as are regional policy variations which result from historical processes, local political attitudes and the impact of various environmental pressure groups. Examples are used to illustrate the way the planning system has dealt with the development of power generating facilities. The changing nature of power generation, particularly the growth of pressure for the development of renewable technologies is discussed and the response of the planning system to these developments is examined. View full abstract»

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    Artificial neural network (ANN) application in dissolved gas analysis (DGA) methods for the detection of incipient faults in oil-filled power transformer

    Zakaria, F. ; Johari, D. ; Musirin, I.
    Control System, Computing and Engineering (ICCSCE), 2012 IEEE International Conference on

    DOI: 10.1109/ICCSCE.2012.6487165
    Publication Year: 2012 , Page(s): 328 - 332

    IEEE Conference Publications

    Power transformer is one of the fundamental equipments in the power system. Transformer breakdown or damage may interrupt power distribution and transmission operation, as well as incur high repair cost. Thus, detection of incipient faults in power transformer is essential and it has become an interesting topic to study. This paper presents the application of artificial neural network (ANN) in detecting incipient faults in power transformers by using dissolved gas analysis (DGA) technique. DGA is a reliable technique to detect incipient faults as it provides wealth of information in analyzing transformer condition. For this project, ANN was developed to classify seven types of transformer condition based on three combustible gas ratios. The development involves constructing several ANN designs and selecting network with the best performance. The gas ratio are based on IEC 60599 (2007) standard while historical data were used in the training and testing processes. The selected ANN design yields a very satisfactory result where it can make a reliable classification of transformer condition with respect to combustible gas generated. View full abstract»

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    Internal Control Analysis Based on the Relationship of Internal Controls, Risk Management, Strategic Objectives

    Tan Xuhong ; Dang Junfeng
    E-Business and E-Government (ICEE), 2010 International Conference on

    DOI: 10.1109/ICEE.2010.1041
    Publication Year: 2010 , Page(s): 4145 - 4149

    IEEE Conference Publications

    The core objective of enterprise management activities is to achieve corporate strategic objectives, Ieaving the core objective to talk about any activity is meaningless. This paper analyzes the delicate relationship of the internal control, the risk management and strategic objectives from the perspective of internal control which is one important way to achieve the core objective of enterprise, The establishment and improvement of internal control for the sustainable development of enterprises hold an very important role. Theorists and practitioners always exist controversy on the relationship of between risk management and internal control. Author not only tries to analyze their relationship from both of the historical development, both of the fundamental aim is to achieve corporate strategic goals, also analyze the enterprises of our county exist the main problems in the implementation of our internal control and put forward constructive suggestions to address these issues. View full abstract»

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    Technology and policy: Opposite ends of the paradox spectrum?

    John, L. ; Boardman, J. ; Sauser, B.
    System of Systems Engineering, 2008. SoSE '08. IEEE International Conference on

    DOI: 10.1109/SYSOSE.2008.4724162
    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (1)

    IEEE Conference Publications

    Based on preliminary research of the experience of ldquosoft subjectrdquo groups like the policy community, we believe that engineers, especially those developing systems of systems, may benefit from an appreciation of paradox. For example, the policy community not only reckons with paradox, it embraces and leverages it to address problems that might otherwise prove intractable. We briefly review the definition of paradox and summarize its potential to generate ldquobreakthroughrdquo thinking that can produce innovative solutions, and illustrate some contemporary engineering problems that contain paradoxes. We then recount several historical examples of successfully applied paradoxical thinking, illustrate the paradoxes inherent in two fundamental systems thinking constructs, and postulate a three-step approach to leveraging paradox in problem solving situations. We close by posing some key follow-on questions and a research program designed to support the development of paradox-related training in a systems thinking/engineering training curriculum. View full abstract»

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    Control stratory in coastal area using Markov Chain and Random Forest

    Sheng-peng Li ; Hong-li Wang
    Industrial Engineering and Engineering Management (IE&EM), 2011 IEEE 18Th International Conference on

    Volume: Part 3
    DOI: 10.1109/ICIEEM.2011.6035480
    Publication Year: 2011 , Page(s): 1664 - 1666

    IEEE Conference Publications

    Economy in coastal cities plays an important role in China. It is urgent to protect environment with economy developing. Four types of sea water quality can be regarded as states of Markov Chain. Transfer probability is viewed as the function of sewage and investment in environmental protection. Based on historical datum in Tianjin, the function is estimated by Random Forest. Given objective of sewage reduction and environmental investment, transfer probability matrix can be calculated and long-term proportion of four types of sea water is obtained. It provides scientific reference for design goal of sewage reduction and environmental investment in reason. View full abstract»

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    Airborne imaging for cultural heritage

    Wypych, T. ; Strawson, J. ; Petrovic, V. ; Angelo, R. ; Hoff, A. ; Howland, M. ; Seracini, M. ; Levy, T. ; Kuester, F.
    Aerospace Conference, 2014 IEEE

    DOI: 10.1109/AERO.2014.6836525
    Publication Year: 2014 , Page(s): 1 - 9

    IEEE Conference Publications

    We present our work in designing and deploying airborne sensor vehicles specifically for cultural heritage applications. Numerous practical cultural heritage missions in survey, assessment, and conservation work can benefit from the utility of specializing commodity and customizable airborne platforms to collect visual and non-visual data. These systems and customizations therein have undergone several generations of development both in our own designs and in the research community at large. We discuss the historical application of airborne imaging to cultural heritage conservation and surveying as well as discuss the design evolution towards multi-rotor systems from conventional rotary-wing and fixed-wing systems. This discussion addresses the fundamental principles of operation, as well as the capabilities, contemporary methods and commodity components available for the implementation of such a system. We present our current system and its features in concert with example payloads of utility in conducting these practical reconnaissance missions, as well as useful post-processing techniques, as well as future work in applied visualization. View full abstract»

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    Complexity and the notion of system of systems: part (I): general systems and complexity

    Karcanias, N. ; Hessami, A.G.
    World Automation Congress (WAC), 2010

    Publication Year: 2010 , Page(s): 1 - 7
    Cited by:  Papers (5)

    IEEE Conference Publications

    The paper reviews the origins of the fundamentals of the systems notion which may underpin the development of a unifying conceptual framework that explains the notion of System of Systems and supports the development of methodologies for System of Systems Engineering. The paper is organised in two parts. Part I deals with a historical review of the development of the notion of systems and then deal with the definition of its key components. The crucial notion of emergence is discussed and links with different domains, where the concept emerges are established. We attempt to identify and classify the fundamental ingredients of the notion of “system complexity”. A typical complex problem, the Integrated Manufacturing System is then considered and its multi-dimensionality and associated challenges provides a motivation for the development of a new structural approach to the definition and characterisation of the notion of System of Systems, which is undertaken in Part II. View full abstract»

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    A historical perspective on localized waves

    Ziolkowski, R.W.
    Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE

    DOI: 10.1109/APS.2014.6904935
    Publication Year: 2014 , Page(s): 1216 - 1217

    IEEE Conference Publications

    A historical perspective on the origins, development and applications of localized waves (LWs) will be presented. In similarity with plane waves, the fundamental LWs can be superimposed to form finite energy solutions of the wave equation or Maxwell's equations. In contrast to plane waves, some form of localization in space-time and phase space is a characteristic of LWs. Bi-directional representations of these LWs help reveal their intrinsic properties and provide techniques to generate many varietals of them. Experimental confirmation of launching LWs from independently addressable, time dependent arrays will be described. View full abstract»

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