Complexity Digest 2002.44

04-Nov-2002

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Content

  1. A New View of Our Universe: Only One of Many, NYTimes
  2. Systems Biology: Life's Complexity Pyramid, Science
    1. Network Motifs: Simple Building Blocks of Complex Networks,, Science
    2. Similar Patterns In Genes, Brains, Feeding, UPI Science News
    3. Transcriptional Regulatory Networks in Saccharomyces cerevisiae, Science
    4. Growing And Navigating The Small World Web By Local Content, PNAS
  3. Thin Ice Opens Lead For Life On Europa, New Scientist
  4. Communities Make Forest Carbon Trading Work, Nature Science Update
    1. Tree Farms Won'T Halt Climate Change, New Scientist
    2. Aircraft Vapour Trails Are Climate Scourge, New Scientist
  5. Neural Economics And The Biological Substrates Of Valuation, Neuron
  6. Cancer Cell Study Revives Cellphone Safety Fears, New Scientist
    1. Cancer Biology: Enhanced: A Matter of Dosage, Science
  7. Gains in Understanding Human Cells, NYTimes
    1. Researchers Discover "Doorways" Into Brain Cells, ScienceDaily
    2. Seeking Smart Drugs, The Scientist
  8. Shaky Shoes Could Boost Balance, New Scientist
  9. Ageing: The Old Worm Turns More Slowly, Nature
  10. Circadian Rhythms: Finer Clock Control, Nature
    1. Feedback Loops and Time Delays in the Drosophila Circadian Oscillator, Biophys. J.
  11. The Evolution of Female Promiscuity, University of Sussex (Video)
  12. Placentas May Nourish Complexity Studies, Science
  13. 'Collective Stomach' Drives Wasp Society, New Scientist
  14. Sorting Out Software Complexity, Communications of the ACM
  15. Quantum, Physics: NOT Logic, Nature
    1. Experimental Realization Of The Quantum Universal NOT Gate, Nature
  16. Construction and Modulation of Synaptic Structures and Circuits, Science
    1. One Nostril Knows What The Other Learns, Nature
  17. Choosing A Biological Science Of Choice, Neuron
    1. Decoding The Relationship Between Sensory Stimuli, Decisions, And Reward, Neuron
  18. When is a Cognitive System Embodied?, Cognitive Systems Research
  19. Complex Challenges: Global Terrorist Networks
    1. National Academies Slam Bush Proposal For Data Security, Nature
  20. Links & Snippets
    1. Other Publications
    2. Webcast Announcements
    3. Conference Announcements
      1. Public Conference  Calls

  1. A New View of Our Universe: Only One of Many, NYTimes Next Article Bookmark and Share

    Excerpts: The prospect of this plethora of universes has brought new attention to a philosophical debate (...) for the last few decades, a debate over the role of life in the universe and whether its physical laws are unique — or, as Einstein once put it, "whether God had any choice."

    Sprinkled through the Standard Model, the suite of equations that describe all natural phenomena, are various mysterious constants, like the speed of light or the masses of the elementary particles, whose value is not specified by any theory now known.


  2. Systems Biology: Life's Complexity Pyramid, Science Next Article Bookmark and Share

    Excerpts: Cells and microorganisms have an impressive capacity for adjusting their intracellular machinery in response to changes in their environment, food availability, and developmental state. Add to this an amazing ability to correct internal errors--battling the effects of such mistakes as mutations or misfolded proteins--and we arrive at a major issue of contemporary cell biology: our need to comprehend the staggering complexity, versatility, and robustness of living systems. (...)-viewing the cell as a network of genes and proteins offers a viable strategy for addressing the complexity of living systems.

    1. Network Motifs: Simple Building Blocks of Complex Networks,, Science Next Article Bookmark and Share

      Excerpts: Complex networks are studied across many fields of science. To uncover their structural design principles, we defined "network motifs," patterns of interconnections occurring in complex networks at numbers that are significantly higher than those in randomized networks. We found such motifs in networks from biochemistry, neurobiology, ecology, and engineering. (¡K) Similar motifs were found in networks that perform information processing, even though they describe elements as different as biomolecules within a cell and synaptic connections between neurons in Caenorhabditis elegans. Motifs may thus define universal classes of networks.


    2. Similar Patterns In Genes, Brains, Feeding, UPI Science News Next Article Bookmark and Share

      Excerpts:  "We start with a network -- a list of elements and their connections," he said. "We then count how many times different patterns appear in this network. To understand which of the many patterns that occur are significant and potentially important, we compare the network to a large set of randomized networks. (...) In each of the randomized networks we again count the number of appearances of the different patterns."

      After a while, the computer program reveals some patterns ["motifs", Ed.] occur much more often than they would at random.


    3. Transcriptional Regulatory Networks in Saccharomyces cerevisiae, Science Next Article Bookmark and Share

      Excerpt: We have determined how most of the transcriptional regulators encoded in the eukaryote Saccharomyces cerevisiae associate with genes across the genome in living cells. (¡K)We use this information to identify network motifs, the simplest units of network architecture, and demonstrate that an automated process can use motifs to assemble a transcriptional regulatory network structure. Our results reveal that eukaryotic cellular functions are highly connected through networks of transcriptional regulators that regulate other transcriptional regulators.

      • Transcriptional Regulatory Networks in Saccharomyces cerevisiae, Lee, Tong Ihn, Rinaldi, Nicola J., Robert, Francois, Odom, Duncan T., Bar-Joseph, Ziv, Gerber, Georg K., Hannett, Nancy M., Harbison, Christopher T., Thompson, Craig M., Simon, Itamar, Zeitlinger, Julia, Jennings, Ezra G., Murray, Heather L., Gordon, D. Benjamin, Ren, Bing, Wyrick, John J., Tagne, Jean-Bosco, Volkert, Thomas L., Fraenkel, Ernest, Gifford, David K., Young, Richard A., Science 2002 298: 799-804

    4. Growing And Navigating The Small World Web By Local Content, PNAS Next Article Bookmark and Share

      Excerpts: Can we model the scale-free distribution of Web hypertext degree under realistic assumptions about the behavior of page authors? (...) receiving much attention due to their potential impact for understanding the structure of the Web (...). Here I investigate the connection between the linkage and content topology of Web pages. The relationship between a text-induced distance metric and a link-based neighborhood probability distribution displays a phase transition between a region where linkage is not determined by content and one where linkage decays according to a power law.


  3. Thin Ice Opens Lead For Life On Europa, New Scientist Next Article Bookmark and Share

    Excerpt: Looking at the 10 per cent of Europa's surface that Galileo has imaged at high resolution, the Arizona group found that roughly half of it consists of "tectonic" terrain, dominated by long, straight ridges and fault lines. The other half appears to be blocks of ice randomly frozen in place, as if they had tumbled together while the surrounding medium was liquid. The researchers say both types of landscape show that cracks or molten regions in the ice have repeatedly exposed the ocean below to the surface.

  4. Communities Make Forest Carbon Trading Work, Nature Science Update Next Article Bookmark and Share

    Excerpts: Big businesses can mitigate their contribution to global warming, and help to lift developing countries out of poverty, by funding forest planting in collaboration with local people, a new report concludes1. (...) The difficulty of maintaining and monitoring forests as carbon sinks has made this type of carbon trading slow to take root. But planting forests "can be the fairest and lowest-cost way of pulling carbon out of the air", says Sara Scherr, of the Washington DC-based organization Forest Trends, which co-authored the new report.

    1. Tree Farms Won'T Halt Climate Change, New Scientist Next Article Bookmark and Share

      Excerpts: The world's densest network of CO2 monitoring devices has revealed that Europe's forests are absorbing up to 400 million tonnes a year, or 30 per cent of the continent's emissions. Researchers once assumed that most of this came from young forests, since old forests were thought to be in equilibrium with the atmosphere - sucking up as much gas as they spew out. (...) old forests actually accumulate more carbon than young plantations. This suggests that conservation of old forests is a better policy for tackling global warming than planting new ones.


    2. Aircraft Vapour Trails Are Climate Scourge, New Scientist Next Article Bookmark and Share

      Excerpt: Airlines could boost their emissions of the greenhouse gas carbon dioxide and still halve their impact on global warming. That is the paradoxical conclusion of a new study into the effects of commercial aviation on the environment.

      The CO2 emitted from their engines is not the only way aircraft affect climate. They also do so through their contrails, the long trails of water vapor and ice that form in an aircraft's wake and which can persist for several hours.


  5. Neural Economics And The Biological Substrates Of Valuation, Neuron Next Article Bookmark and Share

    Abstract: (...) single-unit (...) data from orbitofrontal cortex, suggests major additions to current models of reward processing. We review these data and models and use them to develop a specific computational relationship between the value of a predictor and the future rewards or punishments that it promises. The resulting computational model (...) is shown to anticipate a class of single-unit neural responses in orbitofrontal and striatal neurons. The model also suggests how neural responses in the orbitofrontal-striatal circuit may support the conversion of disparate types of future rewards into a kind of internal currency (...).

  6. Cancer Cell Study Revives Cellphone Safety Fears, New Scientist Next Article Bookmark and Share

    Excerpts: The safety of cellphones has been brought into question once again by research that suggests radio waves from the devices could promote the growth of tumors. Paradoxically, the study suggests that the radiation makes tumors grow more aggressively by initially killing off cancer cells.

    (...) exposed leukaemia cells in the lab to 900-megahertz radio waves at a power level of 1 milliwatt, and then looked at the activity of a gene that triggers cell suicide. (...) maximum power outputs are typically 2 watts, although they regularly use only one-tenth of this power.


    1. Cancer Biology: Enhanced: A Matter of Dosage, Science Next Article Bookmark and Share

      Summary: The canonical hypothesis of tumorigenesis is Knudson's two-hit model, which stipulates that both alleles of a tumor suppressor gene must be inactivated for tumors to form. In their Perspective, Fodde and Smits discuss new work revealing that this model may not hold for a subgroup of tumor suppressor genes. Inactivation of only one allele of these tumor suppressor genes is sufficient, either on its own or in combination with other deleterious events, to cause tumor formation.


  7. Gains in Understanding Human Cells, NYTimes Next Article Bookmark and Share

    Excerpts:  Most of the cell's heavy duty computation is done by direct interactions between the proteins. (...) "The aim of systems biology is to be able to give doctors the same kind of control over cells as electronic engineers have over their circuits."(...)

    Some of these protein-protein interactions, like the cascades that convey messages from outside the cell to the DNA in its nucleus, have been well studied, (...). This has not stopped systems biologists from discussing how they might construct computer models of the entire cell.

     


    1. Researchers Discover "Doorways" Into Brain Cells, ScienceDaily Next Article Bookmark and Share

      Excerpts: (...) discovered that neurons take in receptors and other molecules from their surface membranes through discrete "doorways" -- specialized domains on the surface of nerve cells that regulate such entry. The discovery of such entry points drastically revises a long-held theory that surface molecules such as receptors are enveloped right where they rest in the fatty membrane, to be drawn into the cell’s interior.The researchers said their discovery of the zones raises the possibility that drugs affecting receptor transport to and through the zones could prove useful in treating addiction, depression, stroke, epilepsy, and other neurological disorders (...).

      Scientists have made a significant stride toward understanding how a living cell's, operations are, controlled by the information in its genome.


    2. Seeking Smart Drugs, The Scientist Next Article Bookmark and Share

      Excerpts: Federal and biotech labs research a new generation of drug therapy hat improves memory and concentration without side effects. (...)

      One group in particular is quite interested in finding ways to improve cognition: the US military. Research projects in drug enhancement are underway at the Defense Advance Research Projects Agency, (...). "Every uniform service, as far as I know back in history, has tried to do everything they could reasonably do to enhance performance to make our guys a little better than their guys or a lot better than their guys," (...)


  8. Shaky Shoes Could Boost Balance, New Scientist Next Article Bookmark and Share

    Excerpt: Vibrating shoes that use random noise to amplify subtle signals to the brain could keep stop people unsteady on their feet from losing their balance. When someone leans or sways to one side, pressure on the soles of the feet increases on that side. Normally the nervous system detects these changes and automatically corrects posture. But some people, particularly the elderly, have trouble picking up these signals and sway much more than normal even when they think they are standing still.

  9. Ageing: The Old Worm Turns More Slowly, Nature Next Article Bookmark and Share

    Excerpts: Detailed studies of cellular changes in ageing nematode worms show that they, like humans, suffer progressive muscle deterioration.Randomness of cell damage is another shared hallmark of the ageing process. (...)

    A dramatic feature of the changes described in the aged worms is the seemingly random nature of the large variations between individuals; in other words, the changes appear to be highly stochastic. This is all the more remarkable in an organism that, in so many other respects, is under strict genetic authority.


  10. Circadian Rhythms: Finer Clock Control, Nature Next Article Bookmark and Share

    Excerpts: The clock that governs circadian rhythms is based on a molecular feedback loop, which has just become more complex — two more proteins have been identified as likely components of the loop.(...)

    A typical molecular clock consists of an oscillatory feedback loop generated by a few central clock genes. But in order to understand how the clock regulates an organism's physiology and responds to the environment, it is essential to identify other genes and proteins that interact with the core components.


    1. Feedback Loops and Time Delays in the Drosophila Circadian Oscillator, Biophys. J. Next Article Bookmark and Share

      Excerpts: Although several detailed models of molecular processes essential for circadian oscillations have been developed, their complexity makes intuitive understanding of the oscillation mechanism difficult. The goal of the present study was to reduce a previously developed, detailed model to a minimal representation of the transcriptional regulation essential for circadian rhythmicity in Drosophila. The reduced model contains only two differential equations, each with time delays.A negative feedback loop is included, (...). A positive feedback loop is also included,(...)


  11. The Evolution of Female Promiscuity, University of Sussex (Video) Next Article Bookmark and Share

    Abstract: Males are natural philanderers, trying to seduce every female in sight; females are naturally chaste, more interested in laying eggs than having sex. Right? Wrong. Since the invention of DNA testing in the 1980s, the females of thousands of species have been shown to be rampantly promiscuous--and to gain significant fitness benefits from being so. This result, which came as a complete surprise to biologists, has forced a re-evaluation of our understanding of mating systems.

    In this talk, I will review the historical background to this re-evaluation. I will then discuss reasons that females are promiscuous, and the profound consequences of female promiscuity for male behaviour. will finish by discussing the impact of female promiscuity on broader evolutionary patterns.

    Editor note: Dr. Judson is a scientist and an award-winning journalist who wrote Dr Tatiana's Sex Advice to All Creation.


  12. Placentas May Nourish Complexity Studies, Science Next Article Bookmark and Share

    Excerpts: Placentas have evolved independently three times in closely related Poeciliopsis species (...). Other species in the genus lack placentas, and some have partial maternal provisioning by means of tissues that might be precursors of placentas. Thus the fish present the full trajectory of steps involved in the evolution of this organ, (...), allowing researchers to "see what's been added, or what has changed, and eventually identify the genes associated with the evolution of each trait." (...)

    Placentas serve as a decent stand-in for eyes and other complex organs such as the heart (...)


  13. 'Collective Stomach' Drives Wasp Society, New Scientist Next Article Bookmark and Share

    Excerpts: The mystery of how social wasps, not terribly smart as individuals, build and maintain a complex nest that lasts many generations may have been solved.

    (...) developed a mathematical model that shows that wasps achieve their complex behavior simply by monitoring the level of water in the nest - what he calls the "common stomach" of the colony.

    He believes wasps infer what the level is when they exchange fluids on meeting each other, a behavior called trophallaxis thatis common in many social insects.


  14. Sorting Out Software Complexity, Communications of the ACM Next Article Bookmark and Share

    Excerpts: One of the most controversial issues in industry and academia is the question of software quality. I found couple of very insightful observation of Robert L. Glass in his article on software complexity in November's issue of Communication of ACM. He is pointing at "how the complexity of software manifests itself" ... with ..."couple of little-known, but enormously relevant, research findings." "First...For every 25% increase in problem complexity, there is a 100% increase in complexity of the software solution." "Second...Explicit requirements explode by factor of 50 or more into implicit (design) requirements as a software solution proceeds." Remarkably, he is concluding that "Complexity, I would assert is the biggest factor involved in anything having to do with software field. It is explosive, far reaching, and massive in its scope." These simple, yet indicative rules may become one day part of the well-known proverbial rules explaining better some macro phenomenons.

  15. Quantum, Physics: NOT Logic, Nature Next Article Bookmark and Share

    Excerpt: For any input polarization, the NOT gate (as in conventional electronics) should transmit the opposite - in this case it should produce a photon in the orthogonal polarization state, for example going from vertical to horizontal polarization, or right circular to left circular. When the photon state is known, quantum NOT gates and cloning are possible, because the result of the transformation can be computed and the corresponding state engineered. But if nothing is known about the input state, this strategy is clearly impossible.

     


    1. Experimental Realization Of The Quantum Universal NOT Gate, Nature Next Article Bookmark and Share

      Excerpts: In classical computation, a 'bit' of information can be flipped (that is, changed in value from zero to one and vice versa) using a logical NOT gate; but the quantum analogue of this process is much more complicated. (...) But although perfect flipping of a qubit prepared in an arbitrary state (...) is prohibited by the rules of quantum mechanics, there exists an optimal approximation to this procedure. Here we report the experimental realization of a universal quantum machine that performs the best possible approximation to the universal NOT transformation.


  16. Construction and Modulation of Synaptic Structures and Circuits, Science Next Article Bookmark and Share

    Excerpts: Synapse formation and stabilization in the vertebrate central nervous system is a dynamic process, requiring bi-directional communication between pre- and postsynaptic partners. Numerous mechanisms coordinate where and when synapses are made in the developing brain. This review discusses cellular and activity-dependent mechanisms that control the development of synaptic connectivity.

    (...) aspects of vertebrate synaptogenesis and its relation to activity-dependent processes, from the cellular mechanisms by which neurons communicate with each other to establish synaptic contacts to the role of activity during the development of topographically ordered neuronal maps.


    1. One Nostril Knows What The Other Learns, Nature Next Article Bookmark and Share

      Excerpts: About 30% of the adult human population does not perceive an odour when sniffing the steroid androstenone (...), but will become sensitive to its smell after repeated exposure to the compound. Here we investigate the origin of the plasticity that governs this acquired ability by repeatedly exposing one nostril of non-detecting subjects to androstenone and then testing the unexposed nostril. We find that the exposed nostril and the naive nostril can both learn to recognize the smell, effectively doubling detection accuracy.

      • One Nostril Knows What The Other Learns, Joel D. Mainland, Elizabeth A. Bremner, Natasha Young, Brad N, Johnson, Rehan M. Khan, Moustafa Bensafi & Noam Sobel, Nature 419, 802 (2002); doi:10.1038/419802a

  17. Choosing A Biological Science Of Choice, Neuron Next Article Bookmark and Share

    Abstract: Behavioral ecologists argue that evolution drives animal behavior to efficiently solve the problems animals face in their environmental niches. Neurobiologists interested in how animals make decisons have, in contrast, focused their efforts on understanding the neurobiological hardware that serves as a more proximal cause of that same behavior. Describing the flow of information within the nervous system without regard to these larger goals has been their focus. (...) these two approaches are beginning to fuse. It may soon be possible to view the nervous system as a representational process that solves the mathematically defined economic problems animals face by making efficient decisions.

    1. Decoding The Relationship Between Sensory Stimuli, Decisions, And Reward, Neuron Next Article Bookmark and Share

      Abstract: This article relates a theoretical framework developed by British codebreakers in World War II to the neural computations thought to be responsible for forming categorical decisions about sensory stimuli. In both, a weight of evidence is computed and accumulated to support or oppose the alternative interpretations. A decision is reached when the evidence reaches a threshold value. In the codebreaking scheme, the threshold determined the speed and accuracy of the decision process. Here we propose that in the brain, the threshold may be controlled by neural circuits that calculate the rate of reward.


  18. When is a Cognitive System Embodied?, Cognitive Systems Research Next Article Bookmark and Share

    Abstract: For cognitive systems, embodiment appears to be of crucial importance. Unfortunately, nobody seems to be able to define embodiment in a way that would prevent it from also covering its trivial interpretations such as mere situatedness in complex environments. The paper focuses on the definition of embodiment, especially whether physical embodiment is necessary and/or sufficient for cognitive systems. Cognition is characterized as a continuous complex process rather than ahistorical logical capability. Furthermore, the paper investigates the relationship between cognitive embodiment and the issues of understanding, representation and task specification.

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

    Excerpts: America's scientific élite has issued a stern warning about what it says are the pitfalls of the Bush administration's proposal to create a new category of sensitive, but unclassified, technical information.

    (...) The administration hasn't released details of what kinds of information would be included in the category, which it calls 'sensitive homeland-security information' (...).

    "Experience shows that vague criteria of this kind generate deep uncertainties among both scientists and officials responsible for enforcing regulations," (...). "The inevitable effect is to stifle scientific creativity and to weaken national security."


    1. National Academies Slam Bush Proposal For Data Security, Nature Next Article Bookmark and Share

  20. Links & Snippets Next Article Bookmark and Share

    1. Quantum Computing of Quantum Chaos in the Kicked Rotator Model, B.Levi, B.Georgeot and D.L.Shepelyansky, arXiv
    2. Light-Emitting Silicon Shines Much Brighter in New Invention, John Markoff, NYTimes, 02/10/28 STMicroelectronics has a breakthrough in light-emitting silicon that could lead to more powerful computing processors.
    3. Circulation Is Established In A Step-Wise Pattern In The Mammalian Embryo, Kathleen E McGrath, Anne D Koniski, Jeffrey Malik, James Palis, Blood published 24 October 2002, 10.1182/blood-2002-08-2531
    4. PCR in a Rayleigh-Benard Convection Cell, Madhavi Krishnan, Victor M. Ugaz, Mark A. Burns, p. 793
    5. Pairs Of Dipeptides Synergistically Activate The Binding Of Substrate By Ubiquitin Ligase Through Dissociation Of Its Autoinhibitory Domain, Fangyong Du, Federico Navarro-Garcia, Zanxian Xia, Takafumi Tasaki, Alexander Varshavsky, PNAS 2002;99 14110-14115
    6. A Simple Physical Model For Binding Energy Hot Spots In Protein-Protein Complexes, Tanja Kortemme and David Baker, PNAS 2002;99 14116-14121
    7. On The Simulation Of Protein Folding By Short Time Scale Molecular Dynamics And Distributed Computing, Alan R. Fersht, PNAS 2002;99 14122-14125
    8. Sea Lion Scores Top For Memory, 19:00 23 October 02, James Randerson
    9. Quantum Mechanics: To Condense or Not to Condense, Rice, T. M., Science 2002 298: 760-761, As these recent experiments illustrate, quantum magnetism in a magnetic field offers exemplary systems for exploring the competition between the classical and quantum ground states for interacting bosons--a subject of current research also for the dilute atomic bosonic clouds.
    10. Quantum Pattern Recognition. Carlo A. Trugenberger. arXiv. 2002-10-25.
    11. Echoes in classical dynamical systems. Bruno Eckhardt. arXiv. 2002-10-28.
    12. Gravity Waves Analysis Opens "Completely New Sense", ScienceDaily, Date: 10/30/2002
    13. A Serial Test Of The Laterality Of Familiar Face Recognition, M. Kampfa, I. Nachson & H. Babkoffa, Brain and Cognition, Vol. 50, Issue 1, pp:35-50, Oct. 2002, DOI: 10.1016/S0278-2626(02)00008-8
    14. Adaptive Control Utilising Neural Swarming, A E. Conradie, R. Miikkulainen, C. Aldrich, Proc. Genetic & Evol. Compu. Conf., 2002
    15. Robust Non-Linear Control Through Neuroevolution, F. Gomez & R. Miikkulainen, Tech.Report, AI-TR-2002-292, Oct. 2002.
    16. A Fuzzy Expert System For Evaluating Human Observers In A Visual Detection Task, J. A. Padilla-Medina, F. J. Sanchez-Marin, Fuzzy Sets and Sys., Vol. 132, Issue 3, pp: 389-400, 12/16/2002, DOI: 10.1016/S0165-0114(02)00109-4
    17. Fuzzy Stopping In Continuous-Time Dynamic Fuzzy Systems, Y. Yoshida, Fuzzy Sets and Sys., Vol. 132, Issue 3, pp:291-301, 12/16/2002, DOI: 10.1016/S0165-0114(01)00233-0
    18. A Two-Variable Model Of Somatic-Dendritic Interactions In A Bursting Neuron, C. R. Laing & A. Longtin, Bull. of Math. Biol., Vol. 64, Issue 5, pp:829-860, Sept. 2002, DOI: 10.1006/bulm.2002.0303
    19. DNA Arrays And Neurobiology - What's New And What's Next?, C. Barlow & D. J. Lockhart, Vol. 12, Issue 5, pp:554-561, 10/01/2002, DOI: 10.1016/S0959-4388(02)00353-7
    20. Nonlinear Dynamics Of A Machining System With Two Interdependent Delays, A. M. Gouskov,  S. A. Voronov, H. Paris & S. A. Batzer, Comm. Nonlin. Sc. and Numerical Simul., Vol. 7, Issue 4, pp:207-221, Dec. 2002
    21. Stock Exchange Dynamics Involving Both Gaussian And Poissonian White Noises: Approximate Solution Via A Symbolic Stochastic Calculus, G. Jumarie, Insurance: Math. and Eco., Vol. 31, Issue 2, pp:179-189, Oct. 2002
    22. A Statistical Model For The Genetic Origin Of Allometric Scaling Laws In Biology, R. Wu,   C. X. Ma, R. C. Littell & G. Casella, J. Theor. Biol., Vol. 219, Issue 1, pp: 121-135, Nov. 2002
    23. Fisher's Randomization Test And Darwin's Data- A Footnote To The History Of Statistics, J. A. Jacqueza & Geoffrey M. Jacquez , Math. Biosc., Vol. 180, Issues 1-2, pp:23-28, Nov.-Dec. 2002
    24. Qualitative Theory Of Compartmental Systems With Lags, J. A. Jacqueza & C. P. Simon, Math. Biosc., Vol. 180, Issues 1-2, pp: 329-362, Nov.-Dec. 2002

     SFI Working Papers

    1. Proto-Organism Kinetics: Evolutionary Dynamics of Lipid Aggregates with Genes and Metabolism, Steen Rasmussen, Liaohai Chen, Bärbel M. R. Stadler, and Peter F. Stadler, SFI WP 02-10-054
    2. Modelling “evo-devo” with RNA, Walter Fontana, SFI WP 02-09-053
    3. Centers of Complex Networks, Stefan Wuchty and Peter F. Stadler, SFI WP 02-09-052

    1. Other Publications Next Article Bookmark and Share

      1. Genomics and the Future of Health and Society, Institute of Medicine, 02/10/14
      2. Organizational Change and Leadership, Institute of Medicine, 02/10/1
      3. 7th Experimental Chaos Conference, San Diego, Ca, 02/08/26-29, Video/Audio Report
      4. Seventh International Conference on the Simulation of Adaptive Behavior, Edinburgh, UK, 02/08/04-11, Video/Audio Reports
      5. The Technology Frontier, Gemini Ernst & Young Center for Business Innovation, 02/09/18
      6. Brookings Report Urges Congress to Revise President Bush's Homeland Security Proposal, A Brookings Press Briefing, 02/07/15, Event Video
      7. International Conference on Complex Systems (ICCS2002), Nashua, NH, 02/06/09-14 (video + mp3 downloadable audio)
      8. Understanding Complex Systems: Symposium Complexity in Physical and Biological Structures, Medicine & Ecology, Department of Physics, University of Illinois at Urbana-Champaign, 02/05/13-15
      9. ROBOT: The Future of Flesh and Machine, Rodney A. Brooks, MIT AI Lab, Talk given at the School of Cognitive and Computing Sciences of the University of Sussex, May 14th, 2002.
      10. Dean LeBaron's Archive of Daily Video Commentary, Ongoing Since February 1998

       


    2. Webcast Announcements Next Article Bookmark and Share

      1. Managing Complex Organizations In A Complex World, NECSI, Boston, MA, 02/11/14-15
      2. American Association for Artificial Intelligence (AAAI) Fall Symposium on Chance Discovery: The Discovery and Management of Chance Events, North Falmouth, MA, USA, 02/11/15-17
      3. 4th Asia-Pacific Conference on Simulated Evolution And Learning (SEAL'02), 9th International Conference on Neural Information Processing (ICONIP'02), International Conference on Fuzzy Systems and Knowledge Discovery (FSKD'02), Singapore, 02/11/18-22
      4. Workshop on Modeling Complex Systems, University of Nevada, Reno, 02/11/20-21
        1. One-Day Course: Introduction to Complex Systems, Univ Nevada, Reno, 02/11/19
      5. Strengthening Your Capacity for Healthier Communities, PlexusInstitute, Los Angeles, 02/11/22-23
      6. International Conference on Systems, Development and Self-Organization (ICSDS'2002 ),Beijing, 02/11/30-12/01
      7. 23rd Army Science Conference (ASC): "Transformational Science & Technology for the Army....a race for speed and precision.", Orlando Fl, 02/12/02-05
      8. Managing the Complex IV, ISCE and FGCU, Fort Myers, FL, 02/12/07-10
      9. Artificial Life VIII, UNSW, Sydney, Australia, 02/12/09-13
        1. 1st Workshop on the Modelling of Dynamical Hierarchies in Alife (WDH 2002)
      10. UK Special Interest Group on Multi-Agent Systems (UKMAS-02), Liverpool, UK, 02/12/18-19
      11. One-Week Intensive Course: Complex Physical, Biological and Social Systems, NECSI, Cambridge, MA, 03/01
      12. Hawaii International Conference On System Sciences (HICSS-36), Big Island, Hawaii, 03/01/06-09
      13. INSC 2003, International Nonlinear Sciences Conference Research and Applications in the Life Sciences,Vienna, Austria, 03/02/07-09
      14. 21st ICDE World Conference on Open Learning and Distance Education, Hong Kong, 03/06/01-05
      15. 2003 Genetic and Evolutionary Computation Conference (GECCO-2003), Chicago, IL,03/07/12-16
      16. 2003 AAAI Spring Symposium Series, Computational Synthesis: From Basic Building Blocks To High Level Functionality, Stanford, 03/03/24-27
      17. Uncertainty and Surprise: Questions on Working with the Unexpected, U. of Texas at Austin, Texas, 03/04/10-12
      18. SPIE's First International Symposium on Fluctuations and Noise, Santa Fe, NM, 03/06/01-04
      19. Second International Joint Conference on Autonomous Agents and Multi-Agent Systems (AAMAS-2003), Melbourne, Australia, 03/07/14-18
      20. 2003 IEEE/WIC Intl Joint Conf. Web Intelligence and Intelligent Agent Technology, Beijing, China, 03/10/13-17
      21. On the Prospects of Chaos Aware Traffic Modeling, A. Fekete, M. Marodi, G. Vattay, arXiv

    3. Conference Announcements Next Article Bookmark and Share

      , PlexusCalls, 02/11/08, 1 - 2 pm EST
    4. The Complexity of Entrepreneurship: A Launchcyte Story, PlexusCalls, 02/11/22, 1 - 2 pm EST

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      Complexity: Art and Complex Systems, SUNY, New Paltz, 02/09/14-11/24, COMPLEXITY is the second major museum exhibition about complex systems. It creates bridges across many branches of science and also offers a revolutionary intellectual vector that has ramifications for other disciplines such as art and philosophy.

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