System Dynamics Modeling

Misyurov D.A. Dialectical formulas based on the binary notation as the development formulas // Credo New. 2012. №2

by Dmitry Misyurov

The article suggests dialectical formulas based on the binary notation as the development formulas: formula with... more The article suggests dialectical formulas based on the binary notation as the development formulas: formula with dominant and the non-dominant elements; universal formula; formula with symbolic weight of elements; tautological formula. For example, it suggests an opportunity to use the dialectical formulas for modeling and artificial intelligence creation, etc.

GNSS Based Attitude Determination for Small Unmanned Aerial Vehicles

by James Pinchin

Modeling of the Internet Film Piracy - Preliminary Report

by Pavel Janak

to be published in Tokyo

This paper covers various aspects of film piracy over the Internet. In order to successfully deal with this matter, it... more This paper covers various aspects of film piracy over the Internet. In order to successfully deal with this matter, it is needed to recognize motivational factors related to film piracy. Thus, this study discusses group factors that could motivate individuals to engage in pirate activities. Furthermore, the paper discusses the theoretical effect on box office revenues and explains it on a proposed scheme of solutions for decreasing revenues. The article also maps the scheme of incentive motivational anti-piracy campaigns. Moreover, the paper proposes the preliminary scheme for system dynamic modeling of the Internet film piracy. Scheme is developed as a model of behaviors, influences and relations among the elements pertaining to the Internet film piracy.

Critical Evaluation of Paradigms for Modeling Supply Chains as Complex Socio-Technical Systems

by Behzad Behdani

Working Paper

Each simulation paradigm is characterized by a set of core assumptions and some underlying concepts to describe the... more Each simulation paradigm is characterized by a set of core assumptions and some underlying concepts to describe the world. These assumptions, in fact, constrain the development of a conceptual model for the system of study. Consequently, the choice of appropriate simulation paradigm is an important step in model development process. In this paper, selection of a simulation approach for supply chain modeling is discussed. For this purpose, the supply chain is described from perspective of two well-established system theories. Firstly, supply chains are defined as socio-technical systems. Afterwards, they are described from complex adaptive systems perspective. This study gives a set of features for supply chains as complex socio-technical systems which is subsequently used to compare three simulation paradigms for supply chain modeling – namely, system dynamics, discrete-even simulation and agent-based simulation.

Comparison of the Electronic Realization of the Fractional-Order System and its Model

by Emmanuel Gonzalez

Co-authored with L'ubomir Dorcak, Jan Terpak, Ivo Petras, and Juraj Valsa. Accepted in the 13th International Carpathian Control Conference (ICCC 2012), High Tatras, Podbanske, Grand Hotel Permon, Slovak Republic, May 28-31, 2012.

Real objects in general are fractional-order (FO) systems, although in some types of systems the order is very close... more Real objects in general are fractional-order (FO) systems, although in some types of systems the order is very close to an integer. Also application of FO models is more adequate for the description of dynamical systems than integer-order models. This paper is devoted to the analogue electronic realization of the FO systems, e.g. controlled objects and/or controllers whose mathematical models are FO differential equations. The electronic realization is based on FO differentiator and FO integrator where operational amplifiers are connected with appropriate impedance or in our realization with so called Fractional Order Element (FOE) or Constant Phase Element (CPE). Presented network model in spite of its simplicity approximates quite well the properties of the ideal FO system compared with e.g. domino ladder networks. Also presented, along with the mathematical description, are simulation and measurement results.

A simulation of the Neolithic transition in the Indus valley

by Carsten Lemmen

Co-authored with Aurangzeb Khan, accepted for publication in AGU monograph series (Past climates, civilizations, and landscapes)

The Indus Valley Civilization (IVC) was one of the first great civilizations in prehistory. This bronze age... more The Indus Valley Civilization (IVC) was one of the first great civilizations in prehistory. This bronze age civilization flourished from the end of the fourth millennium BC. It disintegrated during the second millennium BC; despite much research effort, this decline is not well understood. Less research has been devoted to the emergence of the IVC, which shows continuous cultural precursors since at least the seventh millennium BC. To understand the decline, we believe it is necessary to investigate the rise of the IVC, i.e., the establishment of agriculture and livestock, dense populations and technological developments 7000--3000 BC. Although much archaeologically typed information is available, our capability to investigate the system is hindered by poorly resolved chronology, and by a lack of field work in the intermediate areas between the Indus valley and Mesopotamia. We thus employ a complementary numerical simulation to develop a consistent picture of technology, agropastoralism and population developments in the IVC domain. Results from this Global Land Use and technological Evolution Simulator show that there is (1) fair agreement between the simulated timing of the agricultural transition and radiocarbon dates from early agricultural sites, but the transition is simulated first in India then Pakistan; (2) an independent agropastoralism developing on the Indian subcontinent; and (3) a positive relationship between archeological artifact richness and simulated population density which remains to be quantified.

Modelling, parameter estimation and validation of a 300W PEM fuel cell system

by Kary Thanapalan

Co-authored with; Bo Wang, Jonathan Williams, Guo-Ping Liu, David Rees
Published in the Proceedings of the International Control Conference 2008

In this paper a 300W PEM FC Stack dynamic model is developed and implemented in MATLAB/Simulink. Using semi-empirical... more In this paper a 300W PEM FC Stack dynamic model is developed and implemented in MATLAB/Simulink. Using semi-empirical equations for modelling a Proton Exchange Membrane (PEM) fuel cell is proposed for providing a tool for the design and analysis of fuel cell stack systems. The modelling results are compared with experimental results. The comparison shows good agreements between the modelling results and experimental data. The model could be used in PEM fuel cell control related studies.

A System Dynamics Model to Analyze Technology Districts' Evolution In a Knowledge-Based Perspective

by Rosa Maria Dangelico

link: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V8B-4XK9HYK-3&_user=3776532&_coverDate=02%2F28%2F2010&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1449716597&_rerunOrigin=scholar.google&_acct=C000061348&_version=1&_urlVersion=0&_userid=3776532&md5=02add5017318380dfd404bcbf559e277&searchtype=a

Perceptions of the effectiveness of system dynamics-based interactive learning environments: An empirical study.

by Hassan Qudrat-Ullah

Qudrat-Ullah, H. (2010). Perceptions of the effectiveness of system dynamics-based interactive learning environments: An empirical study. Computers & Education, 55: 1277–1286.

Impacting Democracy in a School District Using Social Media and System Dynamics

by Robert Skiff

This article was submitted as a comprehensive examination for the Ed.D is Educational Leadership and Policy Studies at... more This article was submitted as a comprehensive examination for the Ed.D is Educational Leadership and Policy Studies at the University of Vermont.

Getting trapped in the suppression of exploration: a simulation model

by Georges Romme

Published in: Journal of Management Studies, 2011 (co-authored with Bob Walrave and Kim van Oorschot)

The benefits of strategically balancing exploitation and exploration are well documented in the literature.... more The benefits of strategically balancing exploitation and exploration are well documented in the literature. Nonetheless, many firms tend to overemphasize exploitation efforts, a situation commonly referred to as the ‘success trap’. Previous studies have attributed this behaviour to managerial incompetence or myopia. However, some management teams appear to adequately recognize the exploration need, while not being able to bring about the required strategic change. We draw on system dynamics modelling to investigate this phenomenon. A simulation model is developed and then the behaviour of a selected firm is replicated to uncover the underlying processes. As such, we develop a process theory of the success trap at the managerial level, coined the ‘suppression process’. This process theory describes and explains how the interplay between top managers, board members, and exploitation–exploration activities can trap the firm in the suppression of
exploration.

The dynamic structure of social capital: How interpersonal connections create communitywide benefits

by Richard Dudley

Temporal effects in the growth of networks

by Giulio Cimini

An Adaptive Ecosystem Approach to Rehabilitation and Management of the Cooum River Environmental System In Chennai, India

by Martin Bunch

Book:

Bunch, M. J. (2001). An Adaptive Ecosystem Approach to Rehabilitation and Management of the Cooum River Environmental System in Chennai, India. Geography Publication Series, No. 54. Waterloo, ON, Department of Geography, University Waterloo: 461. ISBN: 0921083629

and

PhD Dissertation, Department of Geography, Faculty of Environmental
Studies, University of Waterloo, Waterloo, Ontario, Canada, 2000
xviii and 404p., 53 tables, 61 figures and 24 boxes

This research investigates the application of an adaptive ecosystem approach to the problem of the Cooum River and... more This research investigates the application of an adaptive ecosystem approach to the problem of the Cooum River and environs in Chennai (formerly Madras), India. The Cooum River is an extremely polluted urban stream that flows into the Bay of Bengal through the heart of Chennai, India’s fourth largest metropolis. During the dry (non-monsoon) season, the upper reaches of the river are dry and flow in the river may be attributed primarily to the production of sewage by the city’s population. The river is essentially a foul-smelling open sewer.

Complexity of the problem is due as much to human factors (population growth, poverty, uncontrolled urban development, jurisdictional conflicts, modes of behaviour of the citizenry, and institutional culture) as to physical characteristics of the system (flat topography, tidal action, blockage of the river mouth by sand bar formation, and monsoon flooding). Uncertainty in the situation is both structural (regarding main processes and activities in the system and the nature of relationships among the various actors and elements), and parametric (having to do with scarcity, poor quality and restricted access to data).

This work has drawn upon methods and techniques of Adaptive Environmental Management and Soft Systems Methodology to operate the ecosystem approach and address the problem. Specifically, this has involved a series of workshops which have brought together planners, researchers, NGOs, and other stakeholders in a participatory process oriented toward problem definition, system identification and conceptualization, determination of objectives for management, and the generation and exploration of management interventions. In addition, a central component of the program has been the development of a loosely-coupled GIS, environmental simulation model, and a decision support module. This is based upon a framework provided by participants in the first workshop in the series, and operationalizes a common understanding of the system.

In addition to generating new insight into the nature of the problem situation, the research has provided a potentially useful tool to planners, managers and researchers in Chennai in the form of a GIS database and decision support system (DSS). Aside from the tool itself , it was found that the process of developing a conceptual model, and attempting to represent this in the DSS has made a significant contribution to understanding of the Cooum system. In particular, this process forced assumptions to be stated explicitly and publically, highlighted areas of uncertainty and led to new understanding in participants’ conception of the problem situation. The program of research also provided a much needed forum for open debate and exchange of information which was removed from the restrictive institutional culture of government departments.

Umweltbezogene Informationsverarbeitung: Beiträge der Informatik zu einer Nachhaltigen Entwicklung

by Lorenz Hilty

Habilitationsschrift

Die Informatik hat die Anwendung ihrer Methoden und Techniken in Umweltschutz, Umweltforschung und Umweltplanung zu... more Die Informatik hat die Anwendung ihrer Methoden und Techniken in Umweltschutz, Umweltforschung und Umweltplanung zu einer Spezialdisziplin zusammengefaßt, die seit einigen Jahren als Umweltinformatik bezeichnet wird. Die Umweltinformatik ist bisher noch stark von einem nachsorgenden Umweltschutz geprägt, der vor allem technische Unterstützung bei der Überwachung, Analyse und Dokumentation von Umweltzuständen benötigt. Es gibt jedoch auch eine wachsende Zahl von Forschungs- und Entwicklungsarbeiten, die sich auf vorbeugende Umweltschutzmaßnahmen konzentrieren. Die verarbeiteten Daten und Informationen beziehen sich in diesem Fall seltener auf die natürliche Umwelt und häufiger auf anthropogene Systeme wie z.B. Produktionsprozesse oder Verkehrssysteme, die den Zustand der natürlichen Umwelt beeinflussen. Ziel ist dann die Abschätzung, Analyse und Reduktion der von diesen Systemen verursachten Umweltbelastungen. Wichtige Themen in diesem Bereich sind betriebliche Umweltinformationssysteme und die umweltorientierte Verkehrsmodellierung.

Das Ziel dieser Arbeit ist es, zu untersuchen, welche Beiträge die Informatik zur Verwirklichung einer nachhaltigen Entwicklung leisten kann, und welche Prinzipien und Methoden hierfür eingesetzt werden sollten. Die Orientierung am Leitbild der nachhaltigen Entwicklung macht es erforderlich, Aspekte einzubeziehen, die über die Informatik hinausgehen.

Scenario Analysis: Exploring the Macroeconomic Impacts of Information and Communication Technologies on Greenhouse Gas Emissions

by Lorenz Hilty

During the past decade, several macroeconomic studies on the potentials of information and communication technology... more During the past decade, several macroeconomic studies on the potentials of information and communication technology (ICT) to reduce greenhouse gas (GHG) emissions have been published. The mitigation potentials identified in them vary to a high degree, mainly because they are not consistently defined and diverse methodologies are applied. The characteristics of ICT—exceptional dynamics of innovation and diffusion, social embedment and cross-sector application, diverse and complex impact patterns—are a challenge for macroeconomic studies that quantify ICT impacts on GHG emissions.

This article first reviews principal macroeconomic studies on ICT and GHG emissions. In the second part, we reconsider our own study on this topic and present an in-depth scenario analysis of the future impacts of ICT applications on GHG emissions. We conclude that forthcoming macroeconomic studies could strengthen the state of the art in environmental ICT impact modeling (1) by accounting for the dynamics of new ICT applications and their first-, second-, and third-order effects on a global scale, (2) by reflecting the error margins resulting from data uncertainty in the final results, and (3) by using scenario techniques to explore future uncertainty and its impacts on the results.

The Relevance of Information and Communication Technologies for Environmental Sustainability-A Prospective Simulation Study

by Lorenz Hilty

Information and Communication Technologies (ICT) have relevant positive and negative impacts on environmental... more Information and Communication Technologies (ICT) have relevant positive and negative impacts on environmental sustainability on various levels: First-order effects such as increasing electronic waste streams; second-order effects such as improved energy-efficiency of production; third-order effects such as a product-to-service shift in consumption or rebound effects in transport. In the simulation study described in this article, all known relevant effects on all three levels were modeled using a System Dynamics approach in combination with scenario techniques and expert consultations. The prospective study for the European Union with a time-horizon until 2020 revealed great potential for ICT-supported energy management and for a structural change towards a less material-intensive economy, but strong rebound effects in the transport sector whenever ICT applications lead to time or cost savings for transport.

Dynamics identification of industrial robots using contact force for the IDCS control

by Gentiane Venture

Stewart Platform のマルチボディダイナミクスによるモデル化とIDCSによる運動制御

by Gentiane Venture

Petri nets modeling for dynamic fuzzy anticipatory systems

by Felipe Lara Rosano