Complexity Digest 2002.27

08-Jul-2002

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Content

  1. Agent-Based Modeling: Methods and Techniques for Simulating Human Systems,, PNAS
    1. A Multitrajectory, Competition Model of Emergent Complexity in Human Social Organization, PNAS
    2. Learning Dynamics in Social Dilemmas, PNAS
    3. Competition Among Cooperators: Altruism and Reciprocity, PNAS
    4. Modeling Civil Violence: An Agent-based Computational Approach, PNAS
    5. Multiagent Model of the Kayenta Anasazi in Long House Valley, PNAS
  2. An Economic Analysis Of Altruism: Who Benefits From Altruistic Acts?, JASSS
  3. Why Aren't We Collaborating?, Darwin Mag
  4. The Power Laws, The Science of Success, GetAbstract.com
  5. The Mind Of A Child, Nature Rev. Neurosc.
  6. Short-Memory Traders and Their Impact on Group Learning in Financial Markets, PNAS
    1. Trust, Cooperation, and Market Formation in the U.S. and Japan, PNAS
  7. Individual Complexity And Self-Organization In Foraging By Leaf-Cutting Ants,, Biol Bull
    1. Decision Rules In Insect Societies,, Biol Bull
  8. Memory Use In Insect Visual Navigation, Nature Rev. Neurosc.
  9. Nanoparticles Cut Tumors' Supply Lines, Science
  10. Biomolecules See the Light,, Science
    1. Conformational Dynamics in a Dipeptide After Single-Mode Vibrational Excitation,, Science
  11. When Life Got Hard,, Science
    1. Proterozoic Modular Biomineralized Metazoan,, Science
  12. Signs Earth Recovered Quickly From Asteroid, CNN, AP
    1. A Tropical Rainforest in Colorado 1.4 Million Years After the Cretaceous-Tertiary Boundary,, Science
  13. Restoring an Ecosystem Torn Asunder by a Dam,, NYTimes
  14. Human Ecological Intervention And The Role Of Forest Fires, Sc. of Total Env.
  15. Pharm Pollution: Excreted Antibiotics Can Poison Plants,, Science News
  16. Cell-Phone Buzz: Contradictory Studies Heat Up Radiation Question,, Science News
  17. Training Rats To Search And Alert On Contraband Odors, Appl. Animal Behaviour Sc.
  18. Warning Time Becomes Issue in Air Collision, NYTimes
    1. Deadly German Air Crash Avoidable-Safety Experts, , Reuters
    2. Q&A: Mid-Air Crash,, BBC
    3. TCAS, Traffic Alert and Collision Avoidance System, , MITRE Corporation Website
  19. Complex Challenges: Global Terrorist Networks
    1. Russia Glances to the West for Its New Legal Code,, NYTimes
    2. Lawyer Barred From U.S. Man but Not From the Man's Father, , NYTimes
    3. U.S. Defends Military Custody of Suspect in 'Dirty Bomb' Case,, NYTimes
    4. U.S. Might Refuse New Peace Duties Without Immunity, , NYTimes
    5. Anthrax? The F.B.I. Yawns, NYTimes
    6. Homeland Security Page Sucks, Darwin Mag
  20. Links & Snippets
    1. Other Publications
    2. Webcast Announcements
    3. Conference Announcements
    4. Position Announcement

  1. Agent-Based Modeling: Methods and Techniques for Simulating Human Systems,, PNAS Next Article Bookmark and Share

    Abstract: Agent-based modeling is a powerful simulation modeling technique that has seen a number of applications in the last few years, including applications to real-world business problems. After the basic principles of agent-based simulation are briefly introduced, its four areas of application are discussed by using real-world applications: flow simulation, organizational simulation, market simulation, and diffusion simulation. For each category, one or several business applications are described and analyzed.

    1. A Multitrajectory, Competition Model of Emergent Complexity in Human Social Organization, PNAS Next Article Bookmark and Share

      Abstract: The repeated pattern of emergent human organization at a societal level going from small-scale, egalitarian decentralized societies to complex, stratified, and centralized societies is well-documented in the archaeological record of past societies. In this paper, I outline a multitrajectory model that relates to the broad features of this sequence of societal change. Competition is shown to play a critical role in the way interactionamong decision making, demographic parameters, and social units that organize resource ownership and procurementeither promotes or inhibits change in social organization. Multiagent simulation is discussed as a way to link culturally embedded decision making to emergent properties in the multitrajectory model.

    2. Learning Dynamics in Social Dilemmas, PNAS Next Article Bookmark and Share

      Abstract: The Nash equilibrium, the main solution concept in analytical game theory, cannot make precise predictions about the outcome of repeated mixed-motive games. Nor can it tell us much about the dynamics by which a population of players moves from one equilibrium to another. These limitations, along with concerns about the cognitive demands of forward-looking rationality, have motivated efforts to explore backward-looking alternatives to analytical game theory. Most of the effort has been invested in evolutionary models of population dynamics. We shift attention to a learning-theoretic alternative.


    3. Competition Among Cooperators: Altruism and Reciprocity, PNAS Next Article Bookmark and Share

      Abstract: This paper develops evolutionary agent-based models to test their conjecture in cases where reciprocal preferences can differ in a variety of games. We confirm that reciprocity is necessary but not sufficient for optimal cooperation. We explore the theme of competition among reciprocal cooperators and display three interesting emergent organizations: racing to the "moral high ground," unstable cycles of preference change, and, when we implement reciprocal mechanisms, hierarchies resulting from exploiting fellow cooperators. If reciprocity is a basic mechanism facilitating cooperation, we can expect interaction that evolves around it to be complex, non-optimal, and resistant to change.


    4. Modeling Civil Violence: An Agent-based Computational Approach, PNAS Next Article Bookmark and Share

      Abstract: This article presents an agent-based computational model of civil violence. Two variants of the civil violence model are presented. In the first a central authority seeks to suppress decentralized rebellion. In the second a central authority seeks to suppress communal violence between two warring ethnic groups.


    5. Multiagent Model of the Kayenta Anasazi in Long House Valley, PNAS Next Article Bookmark and Share

      Abstract: We report on a multiagent computational model of this society that closely reproduces the main features of its actual history, including population ebb and flow, changing spatial settlement patterns, and eventual rapid decline. The agents in the model are monoagriculturalists, who decide both where to situate their fields as well as the location of their settlements. Nutritional needs constrain fertility. Agent heterogeneity, difficult to model mathematically, is demonstrated to be crucial to the high fidelity of the model.


  2. An Economic Analysis Of Altruism: Who Benefits From Altruistic Acts?, JASSS Next Article Bookmark and Share

    Excerpt: At the seminar at Collaborate East I partipated in were just 10 paying attendees. But they were the type of people the conference organizers undoubtedly wanted: mainly from large companies, trying to figure out how to use collaborative technology to save money and make money. When we went around the table asking why people were there, I was surprised that almost all of them were interested primarily in software to enable virtual meetings, products from companies such as Webex and Placeware.

  3. Why Aren't We Collaborating?, Darwin Mag Next Article Bookmark and Share

    Excerpts: Although the adults generally performed better and responded faster, there was sufficient overlap in performance to allow two 'matched' groups (...) to be separated out for comparison. A number of frontal and extrastriate brain areas showed differences in activation between children and adults(...). Specifically, there was less activation in a left frontal region and greater activation in posterior left extrastriate cortex in children than in adults, even after they were matched for performance. One possible explanation for these results is the relative maturity of different parts of the brain: the left frontal region might simply be immature in children(...).

  4. The Power Laws, The Science of Success, GetAbstract.com Next Article Bookmark and Share

    Author's Summary: The central theoretical achievement of classical and neoclassical economics is the demonstration, summed up by Adam Smith's metaphor of the 'invisible hand', that the interaction of selfish economic agents may produce a mutually beneficial and Pareto-optimal outcome. Yet, the paper presents apparently counterintuitive results, suggesting that the proposition that altruism should be beneficial in the long term to society is not based on rational economic thinking. The paper presents agent based simulations suggesting that in pure economic terms, altruism can lower society's level of aggregate wealth, except in the case of synergistic altruism, and that non-economic factors might well explain the existence of altruistic behavior

  5. The Mind Of A Child, Nature Rev. Neurosc. Next Article Bookmark and Share

    Editor's Note: Koch's Power Laws should not be confused with the fat-tailed mathematical functions, commonly known under the same name and ubiquitous in complex systems.

    Excerpt: (...) Koch's Power Laws provide a simple framework through which to view the many similarly disparate forces that affect business. Richly detailed and splendidly written, this page-turner applies the laws of science to economics and business. While this is not the first book to use metaphors like Darwinism to explain the workings of commerce, Koch is smart enough and skillful enough to move beyond simple parallels and use the science to identify and explain core elements of business. getabstract.com highly recommends this soon-to-be classic to everyone in the business world.


  6. Short-Memory Traders and Their Impact on Group Learning in Financial Markets, PNAS Next Article Bookmark and Share

    Abstract: This article highlights several issues from simulating agent-based financial markets. These all center around the issue of learning in a multiagent setting, and specifically the question of whether the trading behavior of short-memory agents could interfere with the learning process of the market as whole. It is shown in a simple example that short-memory traders persist in generating excess volatility and other features common to actual markets. Problems related to short-memory trader behavior can be eliminated by using several different methods. These are discussed along with their relevance to agent-based models in general.

    1. Trust, Cooperation, and Market Formation in the U.S. and Japan, PNAS Next Article Bookmark and Share

      Abstract: Compared with the U.S., Japan is believed to have a collectivist culture that nurtures high trust. Results from laboratory and survey research, however, show that Americans are more likely to trust strangers than are Japanese. Why would trust be lower in a collectivist culture? We use an agent-based computational model to explore the evolutionary origin of this puzzling empirical finding. Computer simulations suggest that higher social mobility in the U.S. may be the explanation. With low mobility, agents rarely encounter strangers and thus remain highly parochial, trusting only their neighbors and avoiding open-market transactions with outsiders. With moderate mobility, agents learn to read telltale signs of character so that they can take advantage of better opportunities outside the neighborhood. However, if mobility is too great, there is too little trustworthiness to make the effort to discriminate worthwhile. This finding suggests that higher mobility in the U.S. may explain why Americans are more trusting than Japanese, but if mobility becomes too high, the self-reinforcing high-trust equilibrium could collapse.


  7. Individual Complexity And Self-Organization In Foraging By Leaf-Cutting Ants,, Biol Bull Next Article Bookmark and Share

    Abstract: Leaf-cutting ants cut vegetation into small fragments that they transport to the nest, where a symbiotic fungus cultivated by the ants processes the material. (...) In this paper I summarize experimental work focusing on the decision-making processes that occur at the individual level, and discuss to what extent individual complexity contributes to the emergence of collective foraging patterns. Although some basic features of self-organizing systems, such as the existence of regulatory positive and negative feedback loops, are expected to be involved in the collective organization of leaf-cutting ant foraging, I contend that they are combined with complex individual responses that may result from the integration of local information during food collection with an assessment of colony conditions.

    1. Decision Rules In Insect Societies,, Biol Bull Next Article Bookmark and Share

      Excerpt: In both cases, decision rules are based on intelligent criteria that intrinsically integrate information on multiple variables that are relevant to the ants. Furthermore, the environment can contribute directly to the emergence of collective patterns, independently of any individual behavioral changes. Each environmental factor, including abiotic ones, that alters the dynamics of information transfer in group-living animals should be reconsidered not simply as a constraint but also as a part of the decision-making process and as a agent that shapes the collective pattern.

  8. Memory Use In Insect Visual Navigation, Nature Rev. Neurosc. Next Article Bookmark and Share

    Excerpts: Insects use a mixture of strategies for their navigation. Some strategies involve little memory, and can be used for navigation through an unfamiliar environment. However, these early strategies may be inaccurate or slow. Later, more memory-intensive strategies can be faster or more accurate, but are possible only after multi-trial learning. Early strategies aid learning by providing consistent routes and views. Once a territory becomes familiar and appropriate memories are available, later strategies that rely on these memories tend to take precedence over earlier strategies.

    As yet, there is little evidence that memories are linked into a global map-like network.


  9. Nanoparticles Cut Tumors' Supply Lines, Science Next Article Bookmark and Share

    Excerpts: Molecular-level understanding of the complex dynamics of biological processes such as protein folding will greatly advance the treatment of human disease. (...)

    Using a supersonic jet, infrared (IR) and ultraviolet (UV) lasers, and ab initio quantum chemical calculations, the authors isolated a biomolecule in the gas phase, and identified (...) its energetically accessible "conformational substates" under collision-free conditions.(...). Surprisingly, they found that the resulting population distributions depend upon the precise nature of the excitation, demonstrating for the first time that there are distinguishable pathways for conformational change.


  10. Biomolecules See the Light,, Science Next Article Bookmark and Share

    Excerpts: The dynamics of conformational isomerization are (...), using infrared-ultraviolet (IR-UV) hole-filling and IR-induced population transfer spectroscopies. IR radiation selectively excites individual NH stretch vibrational fundamentals of single conformations of the molecule in the early portions of a gas-phase expansion, and then this excited population is collisionally recooled into its conformational minima for subsequent conformation-specific detection. (...) The quantum yields for transfer of the population into the various conformational minima depend uniquely on which conformation is excited and on which NH stretch vibration is excited within a given conformation.

    1. Conformational Dynamics in a Dipeptide After Single-Mode Vibrational Excitation,, Science Next Article Bookmark and Share

      Summary: Solid tumors do not grow well without a blood supply, and much effort has been directed toward designing drugs that selectively destroy actively growing blood vessels feeding tumors. (...) cationic nanoparticles (NPs) can deliver a toxic gene to tumor blood vessels. Vascular targeting and internalization of the NPs was achieved by coupling them to an organic ligand (...). Systemic injectionof these tailored NPs produced durable regressions of both primary and metastatic tumors in mice.

  11. When Life Got Hard,, Science Next Article Bookmark and Share

    Summary: Biomineralization has been thought to have developed in a series of steps before a great jump in complexity near the base of the Cambrian. Wood et al. (p. 2383) now describe a fossil showing complex patterns of biomineralization from rocks dated to 548 million years ago, in the uppermost Precambrian. This organism, named Namapoikia reitogensis, may also have helped the formation of early reefs.

    1. Proterozoic Modular Biomineralized Metazoan,, Science Next Article Bookmark and Share

      Abstract: We describe a Proterozoic, fully biomineralized metazoan from the Omkyk Member (~549 million years before the present) of the northern Nama Group, Namibia. Namapoikia rietoogensis gen. et sp. nov. is up to 1 meter in diameter and bears a complex and robust biomineralized skeleton; it probably represents a cnidarian or poriferan. Namapoikia encrusts perpendicular to the walls of vertical synsedimentary fissures in microbial reefs. This finding implies that large, modular metazoans with biologically controlled mineralization appeared some 15 million years earlier than previously documented.


  12. Signs Earth Recovered Quickly From Asteroid, CNN, AP Next Article Bookmark and Share

    Excerpts: (...) a lush and vibrant rainforest that emerged surprisingly soon after the asteroid collision that wiped out the dinosaurs 65 million years ago.

    The fossils (...) challenge scientists' long-held assumption that a desolate Earth took about 10 million years to recover from the catastrophe and sprouted only a few dreary plant varieties for a long time.

    Instead, the finding suggests that plant life -- at least at this now-dry prairie along Interstate 25 -- was flourishing as early as 1.4 million years after the impact.


    1. A Tropical Rainforest in Colorado 1.4 Million Years After the Cretaceous-Tertiary Boundary,, Science Next Article Bookmark and Share

      An extremely diverse lower Paleocene (64.1 million years ago) fossil leaf site from Castle Rock, Colorado, contains fossil litter that is similar to the litter of extant equatorial rainforests. The presence of a high-diversity tropical rainforest is unexpected, because other Paleocene floras are species-poor, a feature generally attributed to the Cretaceous-Tertiary (K-T) extinction. (...). Orographic conditions caused by local topography, combined with equable climate, appear to have allowed for the establishment of rainforests within 1.4 million years of the K-T boundary.


  13. Restoring an Ecosystem Torn Asunder by a Dam,, NYTimes Next Article Bookmark and Share

    Excerpts: Adaptive management, they say, rests on two core principles. First, complex systems are inherently unpredictable; it is impossible to know the consequences of various human actions. Second, the only way to manage complex problems is through a collaborative process in which everyone with a stake agrees to try new measures. When experiments fail, (...) these stakeholders must stand ready to try something else based on common interests.

    The technique is being tried in many ecosystems, including the Everglades, the Columbia River basin and the San Francisco Bay delta.


  14. Human Ecological Intervention And The Role Of Forest Fires, Sc. of Total Env. Next Article Bookmark and Share

    Abstract: The present text is a summary of research on the relationship between forest fires and human activities (...) argues that the intense forest fires we experience today are an artifact of human intervention in forest ecology, especially by the reduction of herbivores and are relatively recent, approximately 100000-250000 BP. The history of fire in the context of the increased dominance of humans, has produced a progressively fire-adapted ecology, which argues for human-free wildlife areas and against prescribed burns under many circumstances.

  15. Pharm Pollution: Excreted Antibiotics Can Poison Plants,, Science News Next Article Bookmark and Share

    Excerpt: Patrick K. Jjemba was curious about the interplay of protozoa and the bacteria they eat in soil. As part of his research, he began altering the organisms' environment. When he applied large amounts of protozoan-killing antibiotics to dirt around the roots of soybeans, Jjemba was amazed at what happened. The drugs-widely used in human and veterinary medicine-did far more than subtly alter the balance of microbial predators and prey. One drug stunted soybeans, and another killed the plants.

  16. Cell-Phone Buzz: Contradictory Studies Heat Up Radiation Question,, Science News Next Article Bookmark and Share

    Excerpt: A team from Finland examined the activity of about 4,500 genes in human cells cultured in the laboratory and exposed to cell-phone radiation for 48 hours. The researchers, led by Dariusz Leszczynski of the Radiation and Nuclear Safety Authority in Helsinki, found that in cells exposed to radiation, more than 20 genes were either more or less active than usual. They also noted changes in the amounts of proteins produced by these genes.

    Preliminary results suggest that some of the genes control cell proliferation and response to stress.


  17. Training Rats To Search And Alert On Contraband Odors, Appl. Animal Behaviour Sc. Next Article Bookmark and Share

    Excerpt: But the officials later said their warning came closer to one minute before the crash.

    It "was not irresponsible," but it was "fairly tight," conceded Anton Maag, chief of tower at the Zurich airport.

    Even then, the Russian plane's descent might have avoided a crash had it not been for the automated collision avoidance system on board DHL's Boeing aircraft. It detected the collision course about the same time the Russian plane started to descend, and sent the Boeing downward as well.


  18. Warning Time Becomes Issue in Air Collision, NYTimes Next Article Bookmark and Share

    TCAS barks an audible warning to pilots if an on-board radar system detects another aircraft on the same course, instructing the crew to "CLIMB, CLIMB, CLIMB" or "DESCEND, DESCEND, DESCEND" if a collision becomes imminent.

    "They (TCAS systems) also talk to each other so that both the pilots don't turn in the same direction," said David Learmount, safety editor at Flight International, a weekly trade magazine.

    Editor's Note: This transponder based system apparently doesn't predict the flight path and only recommends up/down as avoidance direction. GPS based systems with state-of-the art computers should be able to do much better.


    1. Deadly German Air Crash Avoidable-Safety Experts, , Reuters Next Article Bookmark and Share

      Excerpt: As often happens at such handovers, pilots are instructed to switch to a new radio frequency to contact the next radio controller. In that switch over there can be a degree of confusion.

      The pilot may not take down the frequency correctly and will call back on the previous frequency to ask who should be contacting them and what the right numbers are. So there can be confusion that creeps in at that moment in time.


    2. Q&A: Mid-Air Crash,, BBC Next Article Bookmark and Share

      Excerpt: Then, in 1974 (sic!), MITRE proposed an alternative. Using the transponders already installed in many aircraft for communication with the FAA's ground-based Air Traffic Control Radar Beacon System (ATCRBS) as the basis for an airborne tracking system, developers could take advantage of existing technologies to significantly hasten the design and implementation process. The Beacon-Based Collision Avoidance System (BCAS) was the predecessor of today's TCAS. This kind of system sends interrogation signals to nearby aircraft in much the same way that the FAA's radar system does. The transponders then send back response signals. The system interprets these signals to learn the location, speed and course of each plane and uses the data to determine whether there is a potential threat.

    3. TCAS, Traffic Alert and Collision Avoidance System, , MITRE Corporation Website Next Article Bookmark and Share

      Abstract: This paper describes (...) experiments that were conducted to test a new concept using rats to detect contraband odors, such as explosives, drugs, or prohibited foodstuffs. Under this concept, the trained alerting behavior of rats is remotely monitored by humans and/or computers to determine when the animals detect a scent of interest (e.g. contraband) during their search behavior. The rats alert on a scent by rearing on their hind legs, which is detected by computer. Our experimental measures include performance and search effectiveness for the rats, detecting a variety of odors including explosive, cocaine, and bleach scents.

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

    Editor's Note:  In ANKOS Wolfram describes how simple (CA) rules can generate the complexity of the universe. Currently we witness fundamental bifurcations in the rules that govern the behavior and interactions of human agents: laws and legal regulations.

    Russia finally made a transition to a modern legal system with rules like "innocent until proven guilty. On the other hand in the current US government has suspended exactly those basic legal rules for one class of people whom the US president accuses of being "enemy combatants". There are no established rules as to who can be given that label. In all examples in history where legal rules for enemies of the community have been suspended, the abuse was pre-programmed: By eliminating any rules of defense for an accused, a false label is easily attached but very hard to remove.

    Once an absolutist view of legal rules is established, it is only consistent that the current US government will not tolerate any international criminal court.

     


    1. Russia Glances to the West for Its New Legal Code,, NYTimes Next Article Bookmark and Share

      Excerpts:  On Monday, Russia will adopt a new legal code that governs the prosecution of criminal cases and protects the rights of those accused. (...)

      Anyone accused of a crime must now appear in court within 48 hours, codifying the concept of habeas corpus into Russia's system. (...)

      The code enshrines the fundamental concept of presumption of innocence and gives new responsibilities - and, in theory, independence - to judges, while it will gradually strip prosecutors of the enormous powers they have wielded over almost every step of any prosecution, (...).


    2. Lawyer Barred From U.S. Man but Not From the Man's Father, , NYTimes Next Article Bookmark and Share

      Excerpts:  The decision covered one narrow aspect of a case that poses numerous constitutional questions about the reach of the president's authority over the rights of an American citizen in a time of war. (...)

      Those questions include whether an American citizen who is accused by the president of being an enemy combatant has a right to a lawyer and whether the United States may detain that person indefinitely without charging him with a crime.


    3. U.S. Defends Military Custody of Suspect in 'Dirty Bomb' Case,, NYTimes Next Article Bookmark and Share

      Excerpts:  The government argued that the federal court in New York lacked jurisdiction over Mr. Padilla, who is being held in a Navy brig in Charleston, S.C., and that the petition, for a writ of habeas corpus, "seeks to interject this court into the president's conduct of ongoing hostilities." (...)

      He is being held in Charleston as an enemy combatant. (...)

      "Padilla is currently being held," the government says, "consistent with the laws and customs of war."


    4. U.S. Might Refuse New Peace Duties Without Immunity, , NYTimes Next Article Bookmark and Share

      Excerpts:  The administration worries (...) American military personnel would not have the constitutional rights granted all Americans in criminal proceedings (...).

      The lawyer, M. Cherif Bassiouni, a professor at DePaul University's law school in Chicago, said prosecutors for the court were selected by its 75 member-states.

      He said the court's statutes also "contain all of the due process guarantees available in the U.S. legal system, and even go beyond that." He added, "The only thing it does not have is a trial by jury."


    5. Anthrax? The F.B.I. Yawns, NYTimes Next Article Bookmark and Share

      Excerpts: The F.B.I.'s bumbling before 9/11 is water under the bridge. But the bureau's lackadaisical ineptitude in pursuing the anthrax killer continues to threaten America's national security (...).

      Some in the biodefense community think they know a likely culprit, whom I'll call Mr. Z. Although the bureau has polygraphed Mr. Z, searched his home twice and interviewed him four times, it has not placed him under surveillance or asked its outside handwriting expert to compare his writing to that on the anthrax letters.


    6. Homeland Security Page Sucks, Darwin Mag Next Article Bookmark and Share

      Excerpt: In one of his speeches, Ridge says, "We're going to knock down the information "stovepipes" throughout government and turn them into pipelines." Excellent and important. So where are those pipelines on the Homeland home page? Where's even a link to the FBI page? How about a link to something - anything! - that isn't just more PR about what a swell job Ridge is doing?

       


  20. Links & Snippets Next Article Bookmark and Share

    1. Other Publications Next Article Bookmark and Share

      1. The Semantic Argument Web, David Weinberger, Darwin Mag, 02/06/14
      2. Nonlinear Dynamics Of Ice-Wedge Networks And Resulting Sensitivity To Severe Cooling Events, L. J. Plug And B. T. Werner, Nature 417, 929 - 933 (2002)
      3. Pest Control: Caffeine As A Repellent For Slugs And Snails, R G Hollingsworth, J W Armstrong & E Campbell, Nature 417, 915 (2002)
      4. A Plant Receptor-Like Kinase Required For Both Bacterial And Fungal Symbiosis, Silke Stracke, Catherine Kistner, Satoko Yoshida, Lonneke Mulder, Shusei Sato, Takakazu Kaneko, Satoshi Tabata, Niels Sandal, Jens Stougaard, Krzysztof Szczyglowski & Martin Parniske, Nature 417, 959 - 962 (2002)
      5. Spider Scents Attract Prey, John Whitfield, Nature Science update, 02/06/24, Sex Pheromone Mimic Lures Two Moths To Their Doom.
      6. Investigating Nonlinear Dynamics From Time Series: The Influence Of Symmetries And The Choice Of Observables, Christophe Letellier Luis A. Aguirre, Chaos, 02/09
      7. Patterns Of Intracellular And Intercellular Ca2+ Waves In The Longitudinal Muscle Layer Of The Murine Large Intestine In Vitro, Grant W. Hennig, Christian B. Smith, Deirdre M. O'Shea, and Terence K.Smith, J. Physiol. (Lond) published 28 June 2002, 10.1113/jphysiol.2002.018986
      8. Art as a State of Mind, Gene J. Koprowski, Wired, 02/07/01, While most artists use paint brush on canvas or another medium to get concepts across, Kaul expresses her ideas with a brain-wave interface.
      9. The Pendulum in the 21st Century--Relic or Trendsetter?, Randall D. Peters, arXiv:physics/0207001, 02/06/28
      10. Bugs Clean Teeth, John Whitfield, Nature Science update, 02/06/28, GM yoghurt could fight tooth decay.
      11. Toward A Method Of Selecting Among Computational Models Of Cognition, Pitt MA, Myung IJ, Zhang S., Psychol Rev. PMID: 12088241
      12. The Influence Of Referential Processing On Sentence Complexity, Warren T, Gibson E., Cognition. 2002 Aug;85(1):79-112.
      13. A Cellular Automata Model Of Water Structuring By A Chiral Solute, Testa B, Kier LB, Cheng CK., J Chem Inf Comput Sci. 2002 May-Jun;42(3):712-6
      14. Wavelet-Based Multifractal Analysis Of Human Balance, Morales CJ, Kolaczyk ED., Ann Biomed Eng. 2002 Apr;30(4):588-97
      15. Aging, Cognitive Complexity, And The Fundamental Attribution Error, Follett KJ, Hess TM., J Gerontol B Psychol Sci Soc Sci. 2002 Jul;57(4):P312-23
      16. Using Information Theory To Assess The Diversity, Complexity, And Development Of Communicative Repertoires, McCowan B, Doyle LR, Hanser SF., J Comp Psychol. 2002 Jun;116(2):166-72
      17. Recall Of Morphologically Complex Forms Is Affected By Memory Task But Not Dyslexia, Service E, Tujulin AM., Brain Lang. 2002 Apr-Jun;81(1-3):42-54.
      18. Telemedicine Versus In-Person Dermatology Referrals: An Analysis Of Case Complexity, Krupinski E, Barker G, Rodriguez G, Engstrom M, Levine N, Lopez AM, Weinstein RS., Telemed J E Health. 2002 Summer;8(2):143-7
      19. Exploring The Complexity Of Compliance In Schizophrenia, Pinikahana J, Happell B, Taylor M, Keks NA., Issues Ment Health Nurs. 2002;23(5):513-28
      20. Gaia As A Complex Adaptive System, Lenton TM, Van Oijen M., Philos Trans R Soc Lond B Biol Sci. 2002 May 29;357(1421):683-95
      21. Self-Organized Instability In Complex Ecosystems, Sole RV, Alonso D, McKane A., Philos Trans R Soc Lond B Biol Sci. 2002 May 29;357(1421):667-71
      22. The Fractal Nature Of Nature: Power Laws, Ecological Complexity And Biodiversity, Brown JH, Gupta VK, Li BL, Milne BT, Restrepo C, West GB., Philos Trans R Soc Lond B Biol Sci. 2002 May 29;357(1421):619-26
      23. Influence Of Increased Environmental Complexity On Leg Condition, Performance, And Level Of Fearfulness In Broilers, Bizeray D, Estevez I, Leterrier C, Faure JM., Poult Sci. 2002 Jun;81(6):767-73
      24. Spatial And Temporal Circulation Of Dengue Virus Serotypes: A Prospective Study Of Primary School Children In Kamphaeng Phet, Thailand, Endy TP, Nisalak A, Chunsuttiwat S, Libraty DH, Green S, Rothman AL, Vaughn DW, Ennis FA., Am J Epidemiol. 2002 Jul 1;156(1):52-9
      25. Complexity Of Sensory Environment Drives The Expression Of Candidate-Plasticity Gene, Nerve Growth Factor Induced-A, Pinaud R, Tremere LA, Penner MR, Hess FF, Robertson HA, Currie RW., Neuroscience. 2002;112(3):573-82.
      26. 15 Answers to Creationist Nonsense, John Rennie, , Scientific American, 02/07, Opponents of evolution want to tear down real science, but their arguments don't hold up
      27. Invariant Manifolds and Collective Motion in Many-body Systems . T. Papenbrock, T. H. Seligman, arXiv.
      28. Computational Organization Science: A New Frontier . Kathleen M. Carley, PNAS.
      29. Software Agents and the Route to the Information Economy . Jeffrey O. Kephart, PNAS.
      30. Tools and Techniques for Developing Policies for Complex and Uncertain Systems . Steven C. Bankes, PNAS.
      31. Policy Analysis from First Principles . Scott Moss, PNAS.
      32. Foundations of "New" Social Science: Institutional Legitimacy from Philosophy, Complexity Science, Postmodernism, and Agent-based Modeling . Leslie Henrickson and Bill McKelvey, PNAS.
      33. Endogenizing Geopolitical Boundaries with Agent-based Modeling . Lars-Erik Cederman, PNAS.
      34. Overcoming Design and Development Challenges in Agent-based Modeling Using ASCAPE . Mario E. Inchiosa and Miles T. Parker, PNAS.
      35. A New Decision Sciences for Complex Systems . Robert J. Lempert, PNAS.
      36. Invariance and Universality in Social Agent-based Simulations . Claudio Cioffi-Revilla, PNAS.
      37. The Hunt Hypothesis and the Dividend Policy of the Firm. The Chaotic Motion of the Profits , Safieddine Bouali, arXiv Paper ID: nlin.CD/0206032. 20-Jun-2002
      38. Modeling the Stylized Facts in Finance Through Simple Nonlinear Adaptive Systems , Cars H. Hommes, PNAS Colloquium Papers 99 (Suppl. 3)
      39. Hear, Here, R. Jones, Nature Reviews Neuroscience, Vol. 3 No 7, pp:492, July 2002, 2002.27, Gerbils do not use a simple delay-line system to calculate sound position.
      40. Complex Dynamics In Nearly Symmetric Three-Cell Cellular Neural Networks, M. Di Marco, M. Forti & A. Tesi, Intl. J. of Bifur. and Chaos, Vol. 12, No. 6, pp:1357-1362, July 2002, 2002.27
      41. Targeting Of Chaotic Dynamical Systems Using Nonlinear Approximations, D. L. Hill, Intl. J. of Bifur. and Chaos, Vol. 12, No. 6, pp:1385-1393, July 2002, 2002.27
      42. Nonlinear Signal Classification, P. E. Rapp, T. A. A. Watanabe, P. Faure, C. J. Cellucci, Intl. J. of Bifur. and Chaos, Vol. 12, No. 6, pp: 1273-1293, July 2002, 2002.27
      43. Investigating Nonlinear Dynamics From Time Series: The Influence Of Symmetries And The Choice Of Observables, C. Letellier & L. A. Aguirre, Chaos: An Interdiscip. J. of Nonlin. Sc., Vol. 12, Issue 3, pp. 549-558, September 2002, 2002.36
      44. The Amygdala And Reward, M. G. Baxter & E. A. Murray, Nature Reviews Neuroscience, Vol. 3 No 7, pp:563 -573, July 2002, 2002.27
      45. Animal Models Of Neurological Deficits: How Relevant Is The Rat?, M. A. Cenci, I. Q. Whishaw & T. Schallert, Nature Reviews Neuroscience 3, pp:574 -579, July 2002, 2002.27
      46. Chaos Control By Using Motor Maps, P. Arena, L. Fortuna & M. Frasca, Chaos: An Interdiscip. J. of Nonlin. Sc., Vol. 12, Issue 3, pp:559-573, September 2002, 2002.36
      47. Chaos Control By Using Motor Maps, P. Arena, L. Fortuna & M. Frasca, Chaos: An Interdiscip. J. of Nonlin. Sc., Vol. 12, Issue 3, pp:559-573, September 2002, 2002.36
      48. Bridging The Gap Between Ecological Diversity Indices And Measures Of Biodiversity With Shannon's Entropy: Comment To Izsák And Papp, C. Ricotta ,Ecological Modelling, Vol. 152 (1), pp:1-3,15 June 2002
      49. Aluminium Content Of Drinking Waters, Fruit Juices And Soft Drinks: Contribution To Dietary Intake, F. F. López, C. Cabrera , M. L. Lorenzo & M. C. López, The Sc. of the Total Environment, Vol. 292 (3), pp: 205-213, 20 June 2002
      50. emerging: Plexus Institute Newsletter, May-June
        • the story Stuart Kauffman told (at a Plexus Institute workshop on narratives, story-telling and complexity) about his life's journey in science;
        • media watch features on Stephen Woframs'a new book A New Kind of Science and a journal article on the first clinical trials of heartwaves, a novel approach to exercise invented by Irving Dardik;
        • "Meet Jim Taylor" - thoughts from a hospital CEO on complexity and management;
        • "NonLinear Conversations" - an alternative to the typical physician-patient interview

         


    2. Webcast Announcements Next Article Bookmark and Share

      1. International Conference on Complex Systems (ICCS2002), Nashua, NH, 02/06/09-14 (video + mp3 downloadable audio)
      2. 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
      3. 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.
      4. Introducing Complexity, The University of Liverpool ,02/04/24, (mp3 web-cast and audio download, contributed by Carlos Gershenson)
      5. Dean LeBaron's Archive of Daily Video Commentary, Ongoing Since February 1998

    3. Conference Announcements Next Article Bookmark and Share

      1. Let's Face Chaos Through Nonlinear Dynamics, Maribor, Slovenia, 02/06/30 - 07/14
      2. Dynamical Systems in Physiology and Medicine, Urbino, Italy02/07/07-17
      3. 7th International Conference on Music Perception & Cognition - ICMPC7, Sydney, 02/07/17-21
      4. Mental Research Institute 2002 Summer Conference, San Mateo, CA, 02/07/26-27
      5. 20th System Dynamics Conference: Organizational Change Dynamics - Understanding Systems, Managing Transformation, Palermo, Italy, 02/07/28-08/01
      6. Complexity and Philosophy, Norwood, Massachusetts, USA, 02/07/29-30
      7. Workshop On Fluctuations Chaos And Complexity In Multistable Systems, Lancaster University, 02/08/01-07
      8. 12th Ann Intl Conf Society For Chaos Theory in Psychology & Life Sciences: Chaos and Complexity in a Changing World, Portland, OR, USA, 02/08/01-04
      9. FROM ANIMALS TO ANIMATS 7 The Seventh International Conference on the SIMULATION OF ADAPTIVE BEHAVIOR (SAB'02), Edinburgh, UK, 02/08/04-11
      10. New Directions in Dynamical Systems, Kyoto, Japan, 02/08/05-15
      11. International Workshop on Meta-Synthesis and Complex Systems, Shanghai, China, 02/08/07-08
      12. International Workshop on Biologically Inspired Robotics: The Legacy of W. Grey Walter, Bristol, UK, 02/08/14-16
      13. 7th Experimental Chaos Conference, San Diego, USA, 02/08/25-29
      14. Econophysics Conference, Denpasar, Bali, Indonesia, 02/08/29-31
      15. Self-Organisation and Evolution of Social Behaviour, Monte Verità, Switzerland, 02/09/08-13
      16. Complex Systems (CS02) Complexity with Agent-Based Modeling, Chuo University, Tokyo, Japan, 02/09/10-12
      17. 3rd Intl NAISO Symposium on Engineering Of Intelligent Systems (EIS 20020), Malaga, Spain, 02/09/24-27
      18. Seminar on Non-equilibrium Phenomena and Phase Transitions in Complex Systems, Avila, Spain, 02/09/24-28.
      19. ACRI 2002, 5th Intl Conf on Cellular Automata for Research and Industry, Geneva, Switzerland, 02/10/09-11 
      20. Dynamical Systems Methods for Advanced Diagnosis and Prognosis, 39th Annual Technical Meeting of the Society of Engineering Science, University Park, Pennsylvania, 02/10/13-16
      21. 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
      22. International Conference on Systems, Development and Self-Organization (ICSDS'2002 ),Beijing, 02/11/30-12/01
      23. Managing the Complex IV, Naples , FL, Early December 2002
      24. Artificial Life VIII, UNSW, Sydney, Australia, 02/12/09-13
        1. 1st Workshop on the Modelling of Dynamical Hierarchies in Alife (WDH 2002)
      25. Hawaii International Conference On System Sciences (HICSS-36), Big Island, Hawaii, 03/01/06-09
      26. INSC 2003, International Nonlinear Sciences Conference Research and Applications in the Life Sciences,Vienna, Austria, 03/02/07-09
      27. 21st ICDE World Conference on Open Learning and Distance Education, Hong Kong, 03/06/01-05

    4. Position Announcement Bookmark and Share

      President of the Santa Fe Institute: We are seeking a distinguished scientist with a demonstrated record of leadership in the scientific community, including recognizing and recruiting scientific colleagues of genuine distinction, and focusing attention on new interdisciplinary frontiers. An appreciation of, interest in, and understanding of transdisciplinary research is essential. The candidate must be an articulate spokesperson for the Santa Fe Institute, and be able to convey to potential donors and the broad general public the excitement of working at the frontiers of science.
      • Robert J. Denison, Chairman of the Board of Trustees, Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501

       

      Staff Memberposition available, Modeling, Algorithms, and Informatics Group (CCS-3), Los Alamos National Laboratory, (...) Current areas of focus relevant to this job include cybersecurity, intelligence analysis for homeland defense, object/target recognition, document classification, bionetwork identification and bio-ontology systems, knowledge network analysis, and collaboration and recommendation technology for digital libraries.

      • Luis Mateus Rocha, Complex Systems Research, MS B256, Los Alamos, NM, (505) 665-1676

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