2,814 research outputs found
Indonesia embraces the Data Science
The information era is the time when information is not only largely
generated, but also vastly processed in order to extract and generated more
information. The complex nature of modern living is represented by the various
kind of data. Data can be in the forms of signals, images, texts, or manifolds
resembling the horizon of observation. The task of the emerging data sciences
are to extract information from the data, for people gain new insights of the
complex world. The insights may came from the new way of the data
representation, be it a visualizations, mapping, or other. The insights may
also come from the implementation of mathematical analysis and or computational
processing giving new insights of what the states of the nature represented by
the data. Both ways implement the methodologies reducing the dimensionality of
the data. The relations between the two functions, representation and analysis
are the heart of how information in data is transformed mathematically and
computationally into new information. The paper discusses some practices, along
with various data coming from the social life in Indonesia to gain new insights
about Indonesia in the emerging data sciences. The data sciences in Indonesia
has made Indonesian Data Cartograms, Indonesian Celebrity Sentiment Mapping,
Ethno-Clustering Maps, social media community detection, and a lot more to
come, become possible. All of these are depicted as the exemplifications on how
Data Science has become integral part of the technology bringing data closer to
people.Comment: Paper presented in South East Asian Mathematical Society (SEAMS) 7th
Conference, 10 pages, 7 figure
Fractal and Multifractal Scaling of Electrical Conduction in Random Resistor Networks
This article is a mini-review about electrical current flows in networks from
the perspective of statistical physics. We briefly discuss analytical methods
to solve the conductance of an arbitrary resistor network. We then turn to
basic results related to percolation: namely, the conduction properties of a
large random resistor network as the fraction of resistors is varied. We focus
on how the conductance of such a network vanishes as the percolation threshold
is approached from above. We also discuss the more microscopic current
distribution within each resistor of a large network. At the percolation
threshold, this distribution is multifractal in that all moments of this
distribution have independent scaling properties. We will discuss the meaning
of multifractal scaling and its implications for current flows in networks,
especially the largest current in the network. Finally, we discuss the relation
between resistor networks and random walks and show how the classic phenomena
of recurrence and transience of random walks are simply related to the
conductance of a corresponding electrical network.Comment: 27 pages & 10 figures; review article for the Encyclopedia of
Complexity and System Science (Springer Science
Evidence of Fueling of the 2000 New Economy Bubble by Foreign Capital Inflow: Implications for the Future of the US Economy and its Stock Market
Previous analyses of a large ensemble of stock markets have demonstrated that
a log-periodic power law (LPPL) behavior of the prices constitutes a qualifying
signature of speculative bubbles that often land with a crash. We detect such a
LPPL signature in the foreign capital inflow during the bubble on the US
markets culminating in March 2000. We detect a weak synchronization and lag
with the NASDAQ 100 LPPL pattern. We propose to rationalize these observations
by the existence of positive feedback loops between market-appreciation /
increased-spending / increased-deficit-of-balance-of-payment /
larger-foreign-surplus / increased-foreign-capital-inflows and so on. Our
analysis suggests that foreign capital inflow have been following rather than
causing the bubble. We then combine a macroeconomic analysis of feedback
processes occurring between the economy and the stock market with a technical
analysis of more than two hundred years of the DJIA to investigate possible
scenarios for the future, three years after the end of the bubble and deep into
a bearish regime. We also detect a LPPL accelerating bubble on the EURO against
the US dollar and the Japanese Yen. In sum, our analyses is in line with our
previous work on the LPPL ``anti-bubble'' representing the bearish market that
started in 2000.Comment: 41 Latex pages including 14 eps figure
Data Science and Knowledge Discovery
Data Science (DS) is gaining significant importance in the decision process due to a mix of various areas, including Computer Science, Machine Learning, Math and Statistics, domain/business knowledge, software development, and traditional research. In the business field, DS's application allows using scientific methods, processes, algorithms, and systems to extract knowledge and insights from structured and unstructured data to support the decision process. After collecting the data, it is crucial to discover the knowledge. In this step, Knowledge Discovery (KD) tasks are used to create knowledge from structured and unstructured sources (e.g., text, data, and images). The output needs to be in a readable and interpretable format. It must represent knowledge in a manner that facilitates inferencing. KD is applied in several areas, such as education, health, accounting, energy, and public administration. This book includes fourteen excellent articles which discuss this trending topic and present innovative solutions to show the importance of Data Science and Knowledge Discovery to researchers, managers, industry, society, and other communities. The chapters address several topics like Data mining, Deep Learning, Data Visualization and Analytics, Semantic data, Geospatial and Spatio-Temporal Data, Data Augmentation and Text Mining
A Language and Its Dimensions: Intrinsic Dimensions of Language Fractal Structures
The present paper introduces a novel object of study - a language fractal
structure. We hypothesize that a set of embeddings of all -grams of a
natural language constitutes a representative sample of this fractal set. (We
use the term Hailonakea to refer to the sum total of all language fractal
structures, over all ). The paper estimates intrinsic (genuine) dimensions
of language fractal structures for the Russian and English languages. To this
end, we employ methods based on (1) topological data analysis and (2) a minimum
spanning tree of a data graph for a cloud of points considered (Steele
theorem). For both languages, for all , the intrinsic dimensions appear to
be non-integer values (typical for fractal sets), close to 9 for both of the
Russian and English language.Comment: Preprint. Under revie
Information measure for financial time series: quantifying short-term market heterogeneity
A well-interpretable measure of information has been recently proposed based
on a partition obtained by intersecting a random sequence with its moving
average. The partition yields disjoint sets of the sequence, which are then
ranked according to their size to form a probability distribution function and
finally fed in the expression of the Shannon entropy. In this work, such
entropy measure is implemented on the time series of prices and volatilities of
six financial markets. The analysis has been performed, on tick-by-tick data
sampled every minute for six years of data from 1999 to 2004, for a broad range
of moving average windows and volatility horizons. The study shows that the
entropy of the volatility series depends on the individual market, while the
entropy of the price series is practically a market-invariant for the six
markets. Finally, a cumulative information measure - the `Market Heterogeneity
Index'- is derived from the integral of the proposed entropy measure. The
values of the Market Heterogeneity Index are discussed as possible tools for
optimal portfolio construction and compared with those obtained by using the
Sharpe ratio a traditional risk diversity measure
Geospatial analysis and living urban geometry
This essay outlines how to incorporate morphological rules within the exigencies of our technological age. We propose using the current evolution of GIS (Geographical Information Systems) technologies beyond their original representational domain, towards predictive and dynamic spatial models that help in constructing the new discipline of "urban seeding". We condemn the high-rise tower block as an unsuitable typology for a living city, and propose to re-establish human-scale urban fabric that resembles the traditional city. Pedestrian presence, density, and movement all reveal that open space between modernist buildings is not urban at all, but neither is the open space found in today's sprawling suburbs. True urban space contains and encourages pedestrian interactions, and has to be designed and built according to specific rules. The opposition between traditional self-organized versus modernist planned cities challenges the very core of the urban planning discipline. Planning has to be re-framed from being a tool creating a fixed future to become a visionary adaptive tool of dynamic states in evolution
Computation in Complex Networks
Complex networks are one of the most challenging research focuses of disciplines, including physics, mathematics, biology, medicine, engineering, and computer science, among others. The interest in complex networks is increasingly growing, due to their ability to model several daily life systems, such as technology networks, the Internet, and communication, chemical, neural, social, political and financial networks. The Special Issue âComputation in Complex Networks" of Entropy offers a multidisciplinary view on how some complex systems behave, providing a collection of original and high-quality papers within the research fields of: ⢠Community detection ⢠Complex network modelling ⢠Complex network analysis ⢠Node classification ⢠Information spreading and control ⢠Network robustness ⢠Social networks ⢠Network medicin
Human Computation and Economics
This article is devoted to economical aspects of Human Computation (HC) and
to perspectives of HC in economics. As of economical aspects of HC, it is first
observed that much of what makes HC systems effective is economical in nature
suggesting that complexity being reconsidered as a âHC complexityâ and the conception
of efficient HC systems as a âHC economicsâ. This article also points to the
relevance of HC in the development of standard software and to the importance of
competition in HC systems. As of HC in economics, it is first argued that markets
can be seen as HC systems avant la lettre. Looking more closely at financial markets,
the article then points to a speed differential between transactions and credit
risk awareness that compromises the efficiency of financial markets. Finally, a HCbased
credit risk rating is proposed that, overcoming the afore mentioned speed
differential, holds promise for better functioning financial markets
- âŚ