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Complexity Digest wrote a new blog post titled Introduction to Focus Issue: Complex Cardiac Dynamics
Even after over a century of active research, the heart continues to reveal new complexities in behavior and remains difficult to understand fully. Multi-scale dynamics ranging from cellular and subcellular behavior to chambers of the heart and the full organ make analysis complicated. In addition, different types of heart functions, including electrical wave signaling, mechanical contraction, and blood flow, present separate challenges. Theory, numerical modeling, and experiments provide different contributions to our understanding of cardiac processes and behavior. This Focus Issue includes...
2 hours ago
Complexity Digest wrote a new blog post titled Compressibility, laws of nature, initial conditions and complexity
We critically analyse the point of view for which laws of nature are just a mean to compress data. Discussing some basic notions of dynamical systems and information theory, we show that the idea that the analysis of large amount of data by means of an algorithm of compression is equivalent to the knowledge one can have from scientific laws, is rather naive. In particular we discuss the subtle conceptual topic of the initial conditions of phenomena which are generally incompressible. Starting from this point, we argue that laws of nature represent more than a pure compression of data, and...
6 hours ago
The Reformed Broker wrote a new blog post titled This Week on TRB
These were the most read posts on the site this week, in case you missed it:...
11 hours ago
Complexity Digest wrote a new blog post titled Identifying Self-Organization and Adaptability in Complex Adaptive Systems
Self-organization and adaptability are critical properties of complex adaptive systems (CAS), and their analysis provides insight into the design of these systems, consequently leading to real-world advancements. However, these properties are difficult to analyze in real-world scenarios due to performance constraints, metric design, and limitations in existing modeling tools. Several metrics have been proposed for their identification, but metric effectiveness under the same experimental settings has not been studied before. In this paper we present an observation tool, part of a complex...
20 hours ago
Complexity Digest wrote a new blog post titled The misleading narrative of the canonical faculty productivity trajectory
Scholarly productivity impacts nearly every aspect of a researcher’s career, from their initial placement as faculty to funding and tenure decisions. Historically, expectations for individuals rely on 60 years of research on aggregate trends, which suggest that productivity rises rapidly to an early-career peak and then gradually declines. Here we show, using comprehensive data on the publication and employment histories of an entire field of research, that the canonical narrative of “rapid rise, gradual decline” describes only about one-fifth of individual faculty, and the...
22 hours ago
The Reformed Broker wrote a new blog post titled Clips From Today’s Halftime Report
General Electric will be relevant again, just not this year: Trader from CNBC. The homebuilder Citi says to buy…and the name investors should avoid from CNBC. Texas Instruments, Nvidia, Cisco & Regional Banks from CNBC....
Complexity Digest wrote a new blog post titled Network control principles predict neuron function in the Caenorhabditis elegans connectome
Recent studies on the controllability of complex systems offer a powerful mathematical framework to systematically explore the structure–function relationship in biological, social, and technological networks1, 2, 3. Despite theoretical advances, we lack direct experimental proof of the validity of these widely used control principles. Here we fill this gap by applying a control framework to the connectome of the nematode Caenorhabditis elegans4, 5, 6, allowing us to predict the involvement of each C. elegans neuron in locomotor behaviours. We predict that control of the muscles or...
Complexity Digest wrote a new blog post titled Mastering the game of Go without human knowledge
A long-standing goal of artificial intelligence is an algorithm that learns, tabula rasa, superhuman proficiency in challenging domains. Recently, AlphaGo became the first program to defeat a world champion in the game of Go. The tree search in AlphaGo evaluated positions and selected moves using deep neural networks. These neural networks were trained by supervised learning from human expert moves, and by reinforcement learning from self-play. Here we introduce an algorithm based solely on reinforcement learning, without human data, guidance or domain knowledge beyond game rules. AlphaGo...
Complexity Digest wrote a new blog post titled Interview about the Conference on Complex Systems 2017
In this episode, Haley interviews Dr. Carlos Gershenson who is a research professor, Editor-in-Chief of Complexity Digest, and a Co-Chair member of the Conference on Complex Systems. Dr. Gershenson discusses this year’s conference and how it is relevant to events happening in the world today. He also shares details about next year’s Conference on Complex Systems. Source: soundcloud.com
The Reformed Broker wrote a new blog post titled CLICK LINK IN CASE OF EMERGENCY
There's a better way: Treat it all like comedy. ...
The Aleph Blog wrote a new blog post titled The Little Market that Could
Picture Credit: Roadsidepictures from The Little Engine That Could By Watty Piper, Illustrated By George & Doris Hauman | That said, for every one that COULD, at least two COULDN’T======================================So what do you think of the market?  Why are both actual and implied volatility so low?  Why are the moves so small, but predominantly up?  Is this the closest impression of the Chinese Water Torture that a stock market can pull off?Why doesn’t the market care about external and internal risks?  Doesn’t it know that we have divisive, seemingly incompetent...
2 days ago
Quantitative Finance at arXiv wrote a new blog post titled The tipping point: a mathematical model for the profit-driven abandonment of restaurant tipping. (arXiv:1710.06893v1 [q-fin.EC])
The custom of voluntarily tipping for services rendered has gone in and out of fashion in America since its introduction in the 19th century. Restaurant owners that ban tipping in their establishments often claim that social justice drives their decisions, but we show that rational profit-maximization may also justify the decisions. Here, we propose a conceptual model of restaurant competition for staff and customers, and we show that there exists a critical conventional tip rate at which restaurant owners should eliminate tipping to maximize profit. Because the conventional tip rate has been...
2 days ago
Quantitative Finance at arXiv wrote a new blog post titled Asymptotic Expansion as Prior Knowledge in Deep Learning Method for high dimensional BSDEs. (arXiv:1710.07030v1 [q-fin.CP])
We demonstrate that the use of asymptotic expansion as prior knowledge in the "deep BSDE solver", which is a deep learning method for high dimensional BSDEs proposed by Weinan E, Han & Jentzen (2017), drastically reduces the loss function and accelerates the speed of convergence. We illustrate the technique and its implications using Bergman's model with different lending and borrowing rates and a class of quadratic-growth BSDEs.
2 days ago
The Reformed Broker wrote a new blog post titled Clips From Today’s Halftime Report
Buy the Apple doom and gloom: Drexel’s Brian White from CNBC. Apple is the biggest drag on the Dow from CNBC. President Trump’s Fed chair decision looms from CNBC. Call of the Day: Goldman downgrades Nike from CNBC. Apple, Brighthouse, United Continental & Adobe from CNBC....
2 days ago
Complexity Digest wrote a new blog post titled Waste Is Information
Waste is material information. Landfills are detailed records of everyday consumption and behavior; much of what we know about the distant past we know from discarded objects unearthed by archaeologists and interpreted by historians. And yet the systems and infrastructures that process our waste often remain opaque. In this book, Dietmar Offenhuber examines waste from the perspective of information, considering emerging practices and technologies for making waste systems legible and how the resulting datasets and visualizations shape infrastructure governance. He does so by looking at three...
2 days ago
The Reformed Broker wrote a new blog post titled 30 years ago today…
There are tradeoffs, always....
2 days ago