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versity throughout the run is maintained at a higher level admga was previously tested in dynamic optimization problems with promising results the algorithm shows to outperform standard gas and state of the art approaches on several problems and dynamics however the performance of the algorithm degrades when the frequency of changes increases due to the premises under which admga was tested it has been argued that the replacement strategy that emerges from the algorithm s dissortative mating strategy may be harming the performance in such situations this study proposes alternative replacement schemes with the objective of improving admga s performance on fast changing environments without damaging the performance on slower ones the strategies maintain the simplicity of the algorithm i e the parameter set is not increased the replacement schemes were tested in dynamic environments based on stationary functions with different characteristics showing to improve standard admga s performance in fast dynamic problems mora fernandes herrera castillo merelo rosa sleeping with ants svms multilayer percepetrons and soms isda 10 2010 and a paper that was presented not published at a workshop in ppsn 2010 held in krakow and of which an enhanced version will be present next week in rome at lion 11 and published in a lncs volume fernandes j l j laredo j j merelo and a c rosa a self organized criticality online adjustment of genetic algorithms mutation rate workshop on self tuning self configuring and self generating search heuristics self 2010 2010 abstract this paper describes an alternative mutation control scheme for genetic algorithms gas inspired by the self organized criticality soc theory the strategy which mimics a soc system known as sand pile is able to generate mutation rates that unlike those generated by other methods of adaptive parameter control oscillate between very low values and cataclysmic mutations in order to attain the desired behaviour the sandpile is not just attached to a ga it is also modified in order for its conduct to reflect the stage of the search i e the fitness distribution of the population due to its characteristics the sandpile mutation arises as a promising candidate for efficient and yet simple and context independent approach to dynamic optimization an experimental study confirms this assumption a ga with sandpile mutation outperforms a recently proposed soc based ga for dynamic optimization furthermore the proposed method does not increase traditional gas parameter set leave a comment posted in uncategorized drawing by ants posted on april 29 2010 leave a comment my paper pherographia drawing by ants appears in the current volume and issue of leonardo journal vol 43 issue 2 here is the abstract abstract this paper addresses the hypothetical relationship of photography and so called pheromone maps created by an artificial life system that simulates an ant colony and causes its activity to evolve based on the contours of images pheromone used by ants to communicate via the environment is also simulated and from the communication and interaction of the swarm with the environment an image there results a kind of drawing made with the simulated pheromone since ants are able to detect the edges of the image the outcome is a sketch that resembles the original image as with old camera obscura drawings this text explores the observable traits shared by the photographic process and the swarm s pheromone maps the theme is discussed in the context of the emergent artificial art research field recent theoretical advances that link swarm intelligence and cognitive sciences are also addressed carlos m fernandes leave a comment posted in art and science artificial art diversity enhanced genetic algorithms for dynamic optimization posted on december 18 2009 leave a comment yesterday in lisbon i defended my phd thesis on evolutionary algorithms for dynamic optimization the pdf of the document is here and this is the abstract many industrial applications have dynamic components that lead to variations of the fitness function and genetic algorithms gas adaptiveness is an appropriate tool to solve this type of problems the thesis proposes two new evolutionary methods to tackle dynamic problems the first acts upon mating and avoids crossover between similar individuals via a self regulated mechanism thus preserving genetic diversity the second is a new mutation operator able to evolve self regulated mutation rates with a particular distribution that is suited for dynamic optimization finally an efficient hybrid method that combines both strategies is proposed the objective and main claim is the possibility of designing nature inspired protocols for gas that are efficient when evolving on dynamic environments while preserving algorithms complexity and not requiring a priori information about the problem the proposals are tested on a wide range of problems and are able to outperform frequently other gas namely when the frequency of change is lower the hybrid scheme proves to be particularly effective since it broadened the range of dynamics in which each method by itself excels as projected the proposed techniques are robust and do not increase parameters set thus fulfilling necessary conditions for real world applications carlos m fernandes leave a comment posted in uncategorized ecal 2009 posted on september 21 2009 leave a comment last week i went to budapest to present the paper an ant based rule for umda s update strategy in the 10th european conference on artificial life ecal 2009 ecal is one of the leading congresses in the area and some of the most relevant work in the artificial life research field is presented there in first hand it is held every two years and this time the capital of hungary was chosen to host the event the academy of sciences in roosevelt tér square on the banks of the danube and with a perfect view on the castle and the hills of buda was ecal s headquarters for 4 days only 30 of the accepted papers were selected for oral presentation the remaining was scheduled for poster sessions although all the accepted papers were published in full length in two lncs volumes that lasted the whole day i cannot understand why not all the congresses follow a line similar to ppsn a poster only congress with 90 minutes sessions when it comes to poster sessions but ecal s strategy is my opinion particularly ineffective and exhausting as for our paper it presents a study on an alternative update strategy for the univariate marginal distribution algorithm based on the aco computational paradigm and first presented here the aim is to control the balance between exploration and exploitation in order to avoid diversity loss reduce the optimal population size and improve the scalability of the algorithm on hard problems the results confirmed the hypothesis this is the abstract this paper investigates an update strategy for the univariate marginal distribution algorithm umda probabilistic model inspired by the equations of the ant colony optimization aco computational paradigm by adapting aco s transition probability equations to the univariate probabilistic model it is possible to control the balance between exploration and exploitation by tuning a single parameter it is expected that a proper balance can improve the scalability of the algorithm on hard problems with bounded difficulties and experiments conducted on such problems with increasing difficulty and size confirmed these assumptions these are important results because the performance is improved without increasing the complexity of the model which is known to have a considerable computational effort authors carlos m fernandes claudio f lima j l j laredo j j merelo and a c rosa leave a comment posted in ant algorithms conferences evolutionary computation genetic algorithms papers stigmergy inside art and science posted on august 17 2009 leave a comment inside gathers 22 artists that interact with science and aims at bridging the gaps between natural sciences and humanities the exhibition opens at cordoria lisbon on the september 24 i will contribute to the it with an artwork based on pherographia and also with a text on art science and consilience that will appear in the catalogue when once asked what he would have liked to be if not a neurologist egas moniz 1874 1955 replied a painter if i just had the skills this statement which is not surprising for those who are aware of the tight links between art and science and the related nature of scientific and artistic creativity is the perfect starting point for some thoughts on the role and the meaning of talent not only in art but also in the realm of scientific research and development the discussion will drive us to through the importance of talent and creativity in art and in the contemporary movements that merge it with science of which artificial art is one of the branches carlos m fernandes leave a comment posted in art and science carlos m fernandes exhibitions pherographia robot arte posted on july 20 2009 leave a comment recently i was invited by leonel moura to write a foreword for a catalog of one of his exhibitions the text ended up being a kind of short essay on art and science with a final overview on artificial life and artificial art the book may be ordered at moura s website in science as in art inspiration is the milestone that marks the beginning of another journey of hard work and exhaustive study the famous anecdote of isaac newton s 1643 1727 apple is the perfect symbol of inspiration or creative leap be it artistic or scientific if it is possible to distinguish them the hidden part that suddenly enlightens the whole the cement that gives consistency to disperse thoughts the decisive step that puts an end to a trembling walk these are the meanings of newton s apple or archimedes s c 287 bc c 212 bc bath eureka albert einstein s 1879 1955 dream of the solution to the general theory of relativity or françois jacob s b 1920 glimpse of how genes work together to make life possible while enjoying a play in a paris theatre are some of the 20 th century s expressions of this old tradition art although it is less dependent on rules and verification is also punctuated by creative leaps take for instance wassily kandinsky 1866 1944 when he said that his painting with a circle 1911 was the first abstract painting he was categorizing the result of an ongoing personal process of denaturalizing motifs but in that particular work unlike the preceding and some of the following a radical change occurred we no longer recognize any figure besides the circles a shape that remained constant throughout the abstract period of his work apparently painting with a circle was not one of kandinsky s favorite works at the time and only later he acknowledged the real implications of his breakthrough and jackson pollock 1912 1956 didn t start his career by dripping paint over a canvas on the floor on the movie pollock 2001 lee krasner his wife played by marcia gay hardner when seeing the painter s first work with that newly found technique said you ve done it pollock you ve cracked it wide open that dramatized scene portrays the well established notion of the artist cracking it wide open after a foretaste of inspiration but the leap is not the only link between art and science in both we recognize that the preparation and meditation on a problem or a feeling precedes the creative burst and after the enlightenment comes the confirmation or development of the concept many beautiful theories are thrown away without even being published that is true but the same happens in the artistic realm with its exasperating dead ends when succeed in the first steps the scientist gains insight into the subject matter through testing the theory and submitting it to methodological falsification an artist goes deep into the subject enhances his ideas and sharpens his view chance or randomness also plays a crucial rule in this whole process many ideas are dealt with and then discarded artists and scientists know what is facing an inglorious ending for a promising thought that cognitive spark the leap that allows us to solve a problem jump into the next stage or broaden our artistic horizons is probably a matching part of two very similar methods if not identical on the other hand it is the notion of creative leap that leads many philosophers and scientists to doubt the algorithmic essence of mind as if the evolutionary process could not create a system capable of that sudden enlightenment or intuition some support their objections on quantum physics others will stick to the vague concept of holism but unless we believe in skyhooks an expression coined by daniel dennett to describe a source of complexity which has not been driven by evolution there seems to be no way around a computational representation of the mind at least if we regard connectionism and self organization as an extension of that line of thought and not as opposing theories in fact the sciences of complexity the discipline that studies complex adaptive system and the emergence of complex behaviour have provided not only a new breath to the old artificial intelligence and robotics fields of research too much dependent on the manipulation of symbols associated with the gofai good old fashioned artificial intelligence but they also contributed to an alternative view of the human mind nowadays complexity and new connectionism are shedding some light on this problem and are gradually erasing the mysticism around emergent and complex behaviour we will address these issues later first let us look at a few dialogues between art and science throughout history carlos m fernandes leave a comment posted in art and science artificial art an ant based rule for umda s update strategy posted on july 20 2009 leave a comment by c m fernandes c f lima j l j laredo a c rosa and j j merelo abstract this paper investigates an update strategy for the univariate marginal distribution algorithm umda probabilistic model inspired by the equations of the ant colony optimization aco computational paradigm by adapting aco s transition probability equations to the univariate probabilistic model it is possible to control the balance between exploration and exploitation by tuning a single parameter it is expected that a proper balance can improve the scalability of the algorithm on hard problems with bounded difficulties and experiments conducted on such problems with increasing difficulty and size confirmed these assumptions these are important results because the performance is improved without increasing the complexity of the model which is known to have a considerable computational effort to appear soon at the european congress on artificial life ecal 2009 carlos m fernandes leave a comment posted in ant algorithms conferences evolutionary computation genetic algorithms papers stigmergy s...