Complexity Digest 2003.32

11-Aug-2003

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Content

  1. Society for Chaos Theory in Psychology & Life Sciences, Webcast
  2. Acquiring an Understanding of Design: Evidence from Children's Insight Problem Solving, Cognition
  3. Organization of cell assemblies in the hippocampus, Nature
  4. Punctuated Equilibrium in Software Evolution, arXiv
    1. Signatures of Small-world and Scale-free Properties in Large Computer Programs, arXiv
  5. Toward a Complexity Science of Entrepreneurship, Journal of Business Venturing
  6. Optimality Of Collective Choices: A Stochastic Approach, Bull. Math. Biol.
    1. Special Sales With Guaranteed Minimum Duration But Uncertain Termination Date, Appl. Math. Modelling
  7. Getting a Grip on Turbulence, Science
    1. Extended Boltzmann Kinetic Equation for Turbulent Flows, Science
    2. Stratospheric Memory and Skill of Extended-Range Weather Forecasts, Science
  8. Satellites aim to shake up quake predictions, Nature
    1. On The Effective Dimension And Dynamic Complexity Of Earthquake Faults, Chaos, Solitons & Fractals
  9. Much ado about data, The Globe Online
  10. Reading a Score, and Beethoven's Mind, NYTimes
  11. Email experiment confirms six degrees of separation, NewScientist.com news service
    1. Supercomputing's New Idea Is Old One, NYTimes
  12. Discoveries Made About Cellular Reaction Processes From Ancient Life, ScienceDaily
  13. Evolutionary Capacitance As A General Feature Of Complex Gene Networks, Nature
    1. Genetic Distance In Sequence Space Of Evolving Populations, Complexity
  14. Self-Organizing Genetic Codes And The Emergence Of Digital Life, Complexity
  15. Complex Dynamics Is Abolished In Delayed Recurrent Systems With Distributed Feedback Times, Complexity
  16. Motor proteins branch out, Nature
    1. Positive Force Feedback In Bouncing Gaits?, Alphagalileo & Proc. B
    2. Mathematical Twist Reveals The Agony Of Back Pain, New Scientist
  17. Biggest not always the daddy in mating game, New Scientist
  18. Breaching the Barrier, Science
  19. Complex Challenges: Global Terrorist Networks
    1. A Fresh Start Against Terror, NYTimes
    2. 'Soft Walls' Will Keep Hijacked Planes At Bay, New Scientist
  20. Links & Snippets
    1. Other Papers
    2. Coming and Ongoing Webcasts
    3. Conference Announcements & Call for Papers
    4. ComDig Announcement: New ComDig Archive in Beta Test

  1. Society for Chaos Theory in Psychology & Life Sciences, Webcast Next Article Bookmark and Share


  2. Acquiring an Understanding of Design: Evidence from Children's Insight Problem Solving, Cognition Next Article Bookmark and Share

    Abstract: The human ability to make tools and use them to solve problems may not be zoologically unique, but it is certainly extraordinary. Yet little is known about the conceptual machinery that makes humans so competent at making and using tools. Do adults and children have concepts specialized for understanding human-made artifacts? If so, are these concepts deployed in attempts to solve novel problems? Here we present new data, derived from problem-solving experiments, which support the following. (i) The structure of the child's concept of artifact function changes profoundly between ages 5 and 7. At age 5, the child's conceptual machinery defines the function of an artifact as any goal a user might have; by age 7, its function is defined by the artifact's typical or intended use. (ii) This conceptual shift has a striking effect on problem-solving performance, i.e. the child's concept of artifact function appears to be deployed in problem solving. (iii) This effect on problem solving is not caused by differences in the amount of knowledge that children have about the typical use of a particular tool; it is mediated by the structure of the child's artifact concept (which organizes and deploys the child's knowledge). In two studies, children between 5 and 7 years of age were matched for their knowledge of what a particular artifact "is for", and then given a problem that can only be solved if that tool is used for an atypical purpose. All children performed well in a baseline condition. But when they were primed by a demonstration of the artifact's typical function, 5-year-old children solved the problem much faster than 6-7-year-old children. Because all children knew what the tools were for, differences in knowledge alone cannot explain the results. We argue that the older children were slower to solve the problem when the typical function was primed because (i) their artifact concept plays a role in problem solving, and (ii) intended purpose is central to their concept of artifact function, but not to that of the younger children.

  3. Organization of cell assemblies in the hippocampus, Nature Next Article Bookmark and Share

    Excerpts: Neurons can produce action potentials with high temporal precision1. A fundamental issue is whether, and how, this capability is used in information processing. According to the 'cell assembly' hypothesis, transient synchrony of anatomically distributed groups of neurons underlies processing of both external sensory input and internal cognitive mechanisms (É) Here we find that the spike times of hippocampal pyramidal cells can be predicted more accurately by using the spike times of simultaneously recorded neurons in addition to the animals location in space.

  4. Punctuated Equilibrium in Software Evolution, arXiv Next Article Bookmark and Share

    Abstract: The approach based on paradigm of self-organized criticality proposed for experimental investigation and theoretical modelling of software evolution. The dynamics of modifications studied for three free, open source programs Mozilla, Free-BSD and Emacs using the data from version control systems. Scaling laws typical for the self-organization criticality found. The model of software evolution presenting the natural selection principle is proposed. The results of numerical and analytical investigation of the model are presented. They are in a good agreement with the data collected for the real-world software.

    1. Signatures of Small-world and Scale-free Properties in Large Computer Programs, arXiv Next Article Bookmark and Share

      Abstract: A large computer program is typically divided into many hundreds or even thousands of smaller units, whose logical connections define a network in a natural way. This network reflects the internal structure of the program, and defines the ``information flow'' within the program. We show that, (1) due to its growth in time this network displays a scale-free feature in that the probability of the number of links at a node obeys a power-law distribution, and (2) as a result of performance optimization of the program the network has a small-world structure. We believe that these features are generic for large computer programs. Our work extends the previous studies on growing networks, which have mostly been for physical networks, to the domain of computer software.

  5. Toward a Complexity Science of Entrepreneurship, Journal of Business Venturing Next Article Bookmark and Share

    Abstract: Darwinian selectionist theory is characterized as equilibrium bound. Complexity science focuses on order creation, hence is a better platform for a science of entrepreneurship. "Self-organization biologists" study order creation in the context of all four Aristotelian causes: material, formal, final, and efficient, whereas normal science rests only on efficient cause. Mohr's process theory and Siggelkow's narrative about entrepreneurship rest on all four, standing as good representations of postmodernist ontology. Since modern epistemology still calls for model-centered science, agent models are proposed as an alternative to mathematics as a means of applying modern normal science standards to research on entrepreneurship--all without downgrading thick, postmodernist descriptions of complex causality.

  6. Optimality Of Collective Choices: A Stochastic Approach, Bull. Math. Biol. Next Article Bookmark and Share

    Abstract: Amplifying communication is a characteristic of group-living animals. This study is concerned with food recruitment by chemical means, known to be associated with foraging in most ant colonies but also with defence or nest moving. A stochastic approach of collective choices made by ants faced with different sources is developed (...). Our results not only confirm that selection is the result of a trail modulation according to food quality but also show the existence of an optimal quantity of laid pheromone for which the selection of a source is at the maximum, whatever the difference between the two sources might be.

    1. Special Sales With Guaranteed Minimum Duration But Uncertain Termination Date, Appl. Math. Modelling Next Article Bookmark and Share

      Abstract: This paper examines a retailer's response to a vendor's trade promotion, which is guaranteed to last some fixed length of time, followed by an additional (uncertain) period of time, "while supplies last". At issue is the development of a general-special-sales model under uncertainty, which produces profit-maximizing policies for a retailer during both the deterministic and the stochastic portions of the special sale period. The search for the optimal policies is substantially simplified by showing that (i) the total profit for the retailer's response problem may be written as a function only of the ending inventory of the deterministic period; (...).

  7. Getting a Grip on Turbulence, Science Next Article Bookmark and Share

    Excerpts: Turbulence--the chaotic behavior of fluid flows--occurs in a wide variety of flows, from the dispersal of pollutants in the atmosphere to the flow of air around automobiles and airplanes. On page 633 of this issue, Chen et al. (1) introduce a new approach that facilitates numerical simulations of these complex processes. All turbulent flows can be described by a set of nonlinear partial differential equations, which were first introduced almost 200 years ago by Navier and Stokes.

    1. Extended Boltzmann Kinetic Equation for Turbulent Flows, Science Next Article Bookmark and Share

      Abstract: Complex fluid physics can be modeled using an extended kinetic (Boltzmann) equation in a more efficient way than using the continuum Navier-Stokes equations. Here, we explain this method for modeling fluid turbulence and show its effectiveness with the use of a computationally efficient implementation in terms of a discrete or "lattice" Boltzmann equation.

    2. Stratospheric Memory and Skill of Extended-Range Weather Forecasts, Science Next Article Bookmark and Share

      Excerpts: Accurate weather forecasts are difficult to make more than a few days in advance because tropospheric dynamics are complicated and chaotic. Stratospheric circulation data may provide a better handle on long-term trends. Baldwin et al. (p. 636) report that the time scale of the Arctic Oscillation (AO), which is associated with variations in wintertime high- to mid-northern latitude weather, appears to be related to stratospheric circulation anomalies that affect surface weather by modulating waves along the top of the troposphere (the tropopause region). The predictability of the AO can be improved by using the lowermost stratospheric circulation instead of that of the troposphere, as is done now.

  8. Satellites aim to shake up quake predictions, Nature Next Article Bookmark and Share

    Excerpts: The controversial idea that earthquakes can be predicted by monitoring tiny fluctuations in Earth's magnetic field is to be tested by two new satellites. Although many seismologists see little merit in the idea, NASA and the US Air Force are together contributing about $1 million to provide data analysis and ground instrumentation to support experiments with the first satellite, (É), the craft is now returning data from orbit after its 30 June launch. A second more expensive and ambitious satellite, funded by the CNES, (É), will follow next April.

    1. On The Effective Dimension And Dynamic Complexity Of Earthquake Faults, Chaos, Solitons & Fractals Next Article Bookmark and Share

      Abstract: We measure the effective dimensionality of a driven, dissipative fault model as its dynamics explore a wide parameter range from a crack like model to a dislocation model. The dynamics of each fault model are probed by recording (a) the first and second order moments of the stresses and slips defined in the fault plane, and (b) the surface deformations that indirectly reflect the brittle processes of the fault (...) we identify the coherent structures (dominant modes) present in the surface deformation fields and project the model dynamics onto the principal directions defined by these coherent structures.

  9. Much ado about data, The Globe Online Next Article Bookmark and Share

    Excerpts: " or years, Shakespeare scholars have debated whether a strange 16th-century play known as ''Edward III'' actually was written by the bard of Avon himself. Some see Shakespeare's brilliant wit in the scene where a clown helps the anxious king compose a love letter. And a few suggest the entire work is genuine Shakespeare, produced early in his career, and deserves a place in the canon."

  10. Reading a Score, and Beethoven's Mind, NYTimes Next Article Bookmark and Share

    Excerpts: It has been 20 years since Roger Norrington began researching the way Beethoven's symphonies were performed in the composer's time and how that style might be revived. Sir Roger was not the first to raise those questions, but the startling set of Beethoven symphonies he recorded in the 1980's with his period instrument band, the London Classical Players, lighted a fire in the world of Beethoven interpretation. At the time most of the early-music world was focused on Baroque and Classical music,(...).

  11. Email experiment confirms six degrees of separation, NewScientist.com news service Next Article Bookmark and Share

    Excerpts: They were asked to contact that person by sending email to people they already knew and considered potentially "closer" to the target. The targets were chosen at random and included a professor from America, an Australian policeman and a veterinarian from Norway. The researchers found that it in most cases it took between five and seven emails to contact the target. Watts says this shows that email has not fundamentally changed the way social ties are created.

    1. Supercomputing's New Idea Is Old One, NYTimes Next Article Bookmark and Share

      Excerpts: After a period of neglect, the intellectual legacy of Seymour Cray, the father of the modern supercomputer, is being revived. The scientists in government, industry and academia who are engaged in the race to build the world's fastest computing machines are now turning their attention once again to Mr. Cray's elegant approach to building ultra-fast computers. When Mr. Cray died (...), the one-of-a-kind machines that embodied his computing philosophy had gone out of fashion, largely replaced by designs based on thousands of connected microprocessors that are inexpensive and mass produced.

  12. Discoveries Made About Cellular Reaction Processes From Ancient Life, ScienceDaily Next Article Bookmark and Share

    Excerpts: How did life begin? What chemical combination launched the first organism with self-contained metabolism? And then what happened? Researchers (...) are tracing the family tree of life on earth by tracing the biochemical mechanisms within the cell - specifically those that are used in the formation of peptide bonds. The building blocks of enzymatic and functional structures in living organisms are proteins created by linking amino acids into peptides (sub units of proteins). "Enzymes that mechanistically do the same thing are included into a family, and we believe that there is an ancestral enzyme for this family." .

  13. Evolutionary Capacitance As A General Feature Of Complex Gene Networks, Nature Next Article Bookmark and Share

    Excerpts: An evolutionary capacitor buffers genotypic variation under normal conditions, thereby promoting the accumulation of hidden polymorphism. But it occasionally fails, thereby revealing this variation phenotypically. (É) Here we use numerical simulations of complex gene networks, as well as genome-scale expression data from yeast single-gene deletion strains, to present a mechanism that extends the scope of evolutionary capacitance (É). We illustrate that most, and perhaps all, genes reveal phenotypic variation when functionally compromised, and that the availability of loss-of-function mutations accelerates adaptation to a new optimum phenotype.

    1. Genetic Distance In Sequence Space Of Evolving Populations, Complexity Next Article Bookmark and Share

      Abstract: A genome-based measure for the distance between two populations is introduced. It fulfills the triangular inequality and can be easily computed, when the genetic sequences of a large number of individuals in two different populations are given. We use this distance for a study of mutating populations evolving under selective pressure, which are living on a computer. As a particular result, we find that evolution is diffusive. We include a comparison of our novel concept and the notion of genomic complexity of populations (...)

  14. Self-Organizing Genetic Codes And The Emergence Of Digital Life, Complexity Next Article Bookmark and Share

    Abstract: The emergence of self-replicating programs from an initially disordered prebiotic phase consisting of randomly generated opcodes (virtual machine instructions) is a challenging problem. The computer world, Amoeba, has many virtual CPUs acting upon sequences of randomly generated codons (opcode templates). An assignment matrix degenerately maps these codons to a genetic basis set of opcodes, analogous to the translation of nucleotides to amino acids. Amoeba self-organizes by increasing assignment probabilities for those codon-opcode pairs in successfully generated children. This halves the effective size of the opcode basis set, doubling the rate of emergence over the control case (random assignments).

  15. Complex Dynamics Is Abolished In Delayed Recurrent Systems With Distributed Feedback Times, Complexity Next Article Bookmark and Share

    Abstract: Feedback systems with a single delay time (...) are known to exhibit various dynamical behaviors including complex oscillations and chaos. Here we show that the consideration of a broad distribution of delay times instead of a single delay results in a shift of the dynamical bifurcations toward higher parameter values, yielding a larger set of parameters with fixed point behavior or simple oscillatory behavior. Our results suggest that the observed simplification of the dynamics is independent of the shape of the delay distribution and the precise nature of the feedback.

  16. Motor proteins branch out, Nature Next Article Bookmark and Share

    Excerpts: Molecular motors are perhaps best known for their ability to transport cargo around inside cells. To do so, these tiny vehicles move along defined intracellular 'tracks'; (É). But some kinesins have a quite separate function, at least in cultured cells: they can break down microtubules into their constituent parts. (É) propose that this function is essential in vivo for the brain to develop normally. (É)Video analysis showed that, in wild-type neurons, any collateral branches that formed actively shrank back. But in the mutant cells the branches continued growing.

    1. Positive Force Feedback In Bouncing Gaits?, Alphagalileo & Proc. B Next Article Bookmark and Share

      Abstract: In daily routine, many stereotypic movements are required. For instance, during childhood, we acquire the skills to walk or run by interacting with our environment. Following this process, uniform, rhythmic muscle activations emerge. What mechanism could evoke the appropriate activations? We investigated whether the control effort of bouncing tasks (hopping or running) could be relaxed by incorporating muscle specific sensory information. We found that a simple, force dependent modulation of the muscle activation (positive force feedback) is most appropriate. Hence, it seems that locomotor tasks could profit from the mechanical interaction of the neuromuscular system with its environment.

    2. Mathematical Twist Reveals The Agony Of Back Pain, New Scientist Next Article Bookmark and Share

      Excerpts: The first comprehensive model of the human spine is challenging our assumptions about the causes of back pain. Contrary to the idea that spinal injuries are caused by a combination of compression, bending, tension and shear forces, the 3D animated mode,. (É) In contrast, the FSS is at least 10 times as complex as any other model, (É). To evaluate the risk of spinal injury, it can be varied to account for body size and strength, as well as the nature of an impact, such as a car crash.

  17. Biggest not always the daddy in mating game, New Scientist Next Article Bookmark and Share

    Excerpts: Being a big, macho male does not always impress the fairer sex. Contrary to commonly accepted theory, the females of some species are partial to weedier partners. Animal behaviourists usually expect males to compete with each other for mates, with females preferring the larger, more aggressive or better-endowed winners. But this is not so for certain salmon and quail.Some male coho salmon, known as jacks, stop growing earlier in their lives and remain smaller than their larger cousins, known as hooknoses, (...).

  18. Breaching the Barrier, Science Next Article Bookmark and Share

    Excerpts: Transporter proteins are integral membrane proteins that selectively mediate the passage of molecules across the otherwise impermeable barrier (...) that surrounds all cells and organelles. (...) Among the most fascinating transporters are those that act as molecular pumps, translocating their substrates across membranes against a concentration gradient; this thermodynamically unfavorable process is powered by coupling to a second, energetically favorable process such as ATP hydrolysis or the movement of a second solute down a transmembrane concentration gradient. (...) a new era in defining transport mechanisms in molecular detail.
    • Source: Breaching the Barrier, Kaspar P. Locher, Randal B. Bass, Douglas C. Rees, Science 2003 301: 603-604.

  19. Complex Challenges: Global Terrorist Networks Next Article Bookmark and Share

    1. A Fresh Start Against Terror, NYTimes Next Article Bookmark and Share

      Excerpts: At the C.I.A., (...), the "business model" goes something like this: "Collect information other countries don't want us to have. (...). And keep all of this a tightly guarded secret so we can keep doing it as long as possible." Homeland security, however, requires a totally different business model: "Collect information from as many sources as possible. Get the product out quickly to thousands of local officials and emergency workers so they can anticipate threats and respond effectively. And do all of this while respecting the civil liberties of Americans."
      • Source: A Fresh Start Against Terror, NYTimes

    2. 'Soft Walls' Will Keep Hijacked Planes At Bay, New Scientist Next Article Bookmark and Share

      Excerpts: Lee's system, called "soft walls", would first gently resist the pilot, and then become increasingly forceful until it prevailed. To the pilot, it would feel like fighting an external force, such as a strong wind. (...) The system would include an on-board database of the GPS coordinates of the no-fly zones. If it sensed an attempt to jam GPS signals it would switch to other navigation aids such as airport beacons. Being independent of ground control means soft walls would be immune to hacking. Editor's Note: "Immune to hacking." sounds like "once-and-for-all pest control" or "final anti-biotic" or ... suggesting a profound ignorance of the adaptibility of complex adaptive systems.

  20. Links & Snippets Next Article Bookmark and Share

    1. Other Papers Next Article Bookmark and Share

      1. Anusaaraka: Overcoming the Language Barrier in India, Akshar Bharati, Vineet Chaitanya, Amba P. Kulkarni, Rajeev Sangal, G Umamaheshwara Rao, 2003-08-07, arXiv, DOI: cs.CL/0308018
      2. The Influence of Hierarchy on Probability Judgment, David A. Lagnado, David R. Shanks, 2003-09, Cognition 89(2):157-178, DOI: 10.1016/S0010-0277(03)00099-4
      3. Mathematical Modelling Of The Cellular Mechanics Of Plants, D. M. Bruce, 2003/07/30, DOI: 10.1098/rstb.2003.1337
      4. Amphibians' Life Stages Influence Contaminant Transfer From Aquatic To Terrestrial Environments, 2003/08/01, ScienceDaily & Univ. Of Georgia
      5. Marine Protected Areas In "Non-Linear" Ecosystems, J. H. Steele & A. R. Beet, 2003/08/04
      6. Climate And Density Shape Population Dynamics Of A Marine Top Predator, C. Barbraud & H. Weimerskirch, 2003/08/04
      7. Researchers Find Way To Improve Musical Performance, 2003/08/04, ScienceDaily & Imperial College Of Sc., Tech. & Med.
      8. Controlling Body Size By Regulating The Number Of Cells, G. Bradley - pressabiomedcentral.com, 2003/08/05
      9. Purdue Scientists Discover Why We're All Lefties Deep Down, 2003/08/06, ScienceDaily & Purdue Univ.
      10. Divergent Evolution During An Experimental Adaptive Radiation, R. C. MacLean & G. Bell, 2003/08/07, DOI: 10.1098/rspb.2003.2408
      11. Is Hippocampal Volume Affected By Specialization For Food Hoarding In Birds?, A. Brodin & K. Lundborg, 2003/08/07, DOI: 10.1098/rspb.2003.2413
      12. Mixed States On Neural Network With Structural Learning, T. Kimoto & M. Okada, Article in Press, DOI: 10.1016/S0893-6080(03)00137-0
      13. Limits On Theory Of Mind Use In Adults, B. Keysar, S. Lina & D. J. Barr, Aug. 2003, DOI: 10.1016/S0010-0277(03)00064-7
      14. Fractal Dimensional Analysis Of Indian Climatic Dynamics, G. Rangarajan & D. A. Sant, Jan. 2004, DOI: 10.1016/S0960-0779(03)00042-0
      15. Fractal Dynamics In The Growth Of Root, Z. Morávek & J. Fiala, Jan. 2004, DOI: 10.1016/S0960-0779(03)00086-9
      16. A Two-Current Model For The Dynamics Of Cardiac Membrane, C. C. Mitchell & D. G. Schaeffer, Sep. 2003, DOI: 10.1016/S0092-8240(03)00041-7

    2. Coming and Ongoing Webcasts Next Article Bookmark and Share

      1. 13th Ann Intl Conf, Soc f Chaos Theory in Psych & Life Sciences, Boston, MA, USA, 2003/08/08-10
      2. IMA International Conference Bifurcation 2003, Univ. Southampton, UK, 27-30 July, 2003
      3. New Santa Fe Institute President About His Vision for SFI's Future Role, (Video, Santa Fe, NM, 03/06/04)
      4. Edge Videos
      5. World Economic Forum Extraordinary Annual Meeting, Jordan, 03/06/21-23
      6. SPIE's 1st Intl Symp on Fluctuations and Noise, Santa Fe, NM, 2003/06/01-04
      7. NAS Sackler Colloquium on Mapping Knowledge Domains, Video/Audio Report, 03/05/11
      8. Uncertainty and Surprise: Questions on Working with the Unexpected and Unknowable, The University of Texas Austin, Texas USA, 2003/04/10-12
      9. New Trends In Industrial Partnership And Innovation Management At European Research Laboratories, CERN, Geneva, 2003/03/19 (with webcast)
        1. CERN Webcast Service, Streamed videos of Archived Lectures and Live Events
      10. Dean LeBaron's Archive of Daily Video Commentary, Ongoing Since February 1998

       


    3. Conference Announcements & Call for Papers Next Article Bookmark and Share

      1. Exystence Thematic Institute - Algorithms And Challenges In Hard Combinatorial Problems - Trieste, Italy, 03/07/01-31, Turin, Italy, 03/10/01-30
      2. Thematic Institute "Networks and Risks", Budapest, Hungary, 03/08/25 - 09/27
      3. Conference on Growing Networks and Graphs in Statistical Physics, Finance, Biology and Social Systems, Rome, 03/09/01-05
      4. Call for Papers on Dynamical Hierarchies, Special Issue of Artificial Life, Deadline: 2003/09/05
      5. 7th European Conference on Artificial Life (ECAL-2003), Dortmund, Germany, 2003/09/14-17
      6. A Dual International Conference on Ethics, Complexity & Organisations & Creativity, London, UK, 2003/09/17-18
      7. 1st German Conference on Multiagent System Technologies (MATES'03), Erfurt, Germany, 2003/09/22-25
      8. Dynamics Days 2003, XXIII Annual Conference, 4 Decades of Chaos 1963-2003, Palma de Mallorca, Spain, 03/09/24-27
      9. Improving The NHS Through The Lens Of Complexity, U Exeter, UK, 03/09/24-26
      10. Emerging Technologies Conference at MIT, Cambridge, MA, 2003/09/24-25
      11. Intl School Mathematical Aspects of Quantum Chaos II Quantum Chaos on Hyperbolic Manifolds, Schloss Reisensburg (Günzburg, Germany), 03/10/04-11
      12. European Workshop on The Analysis of Microfabrics in Geomaterials, München, Germany, 03/10/06-11
      13. 2003 IEEE/WIC Intl Joint Conf. Web Intelligence and Intelligent Agent Technology, Halifax, Canada, 2003/10/13-17
        1. Workshop on Collaboration Agents: Autonomous Agents for Collaborative Environments, Halifax, Canada, 03/10/13
      14. American Society for Cybernetics (ASC) 2003 Conference (H.v.Foerster), Vienna, Austria, 2003/11/10-15
      15. Trends And Perspectives In Extensive And Non-Extensive Statistical Mechanics, In Honour Of The 60th Birthday Of Constantino Tsallis, Angra Dos Reis, Brazil, 2003/11/19-21
      16. ICDM '03: The Third IEEE International Conference on Data Mining, Melbourne, Florida, USA, 2003/11/19-22
      17. 4th Intl Conf on Systems Science and Systems Engineering, Hong Kong, 03/11/25-28
      18. 3rd International Workshop on Meta-Synthesis and Complex System, Guangzhou, China, 2003/11/29-30
      19. 2nd International Workshop on the Mathematics and Algorithms of Social Insects, Georgia Tech, Atlanta, Georgia, USA; 2003/12/15-17
      20. 2nd Biennial Seminar on the Philosophical, Epistemological, and Methodological Implications of Complexity Theory, Havana, Cuba, 04/01/07-10
      21. 1st International Workshop on Biologically Inspired Approaches to Advanced Information Technology, Lausanne, Switzerland, 04/01/29-30
      22. 4th Intl ICSC Symposium Engineering Of Intelligent Systems (EIS 2004), Island of Madeira, Portugal, 04/02/29-03/02
      23. Fractal 2004, "Complexity and Fractals in Nature", 8th Intl Multidisciplinary Conf, Vancouver, Canada, 2004/04/04-07
      24. Urban Vulnerability and Network Failure: Constructions and Experiences of Emergencies, Crises and Collapse, Manchester, UK, 04/04/29-30
      25. Fifth International Conference on Complex Systems (ICCS2004), Boston, MA, USA, 2004/05/16-21
      26. 13th International Symposium on HIV & Emerging Infectious Diseases, Toulon, France, 04/06/03-05

       


    4. ComDig Announcement: New ComDig Archive in Beta Test Bookmark and Share

      We are in the process of upgrading the Complexity Digest archives to a format with improved search capabilities. Also, we will finally be able to adequately publish the valuable feedback and comments from our knowledgable readers. You are cordially invited to become a beta tester of our new ComDig2 archive.

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