197,918 research outputs found
MDL Based Model Selection for Relevance Vector Regression
No full textRelevance Vector regression is a form of Support Vector regression, recently proposed by M.E.Tipping, which allows a sparse representation of the data. The Bayesian learning algorithm proposed by the author leaves the partially open question of how to automatically choose the optimal model. In this paper we describe a model selection criterion inspired by the Minimum Description Length (MDL) principle. We show that our proposal is effective in finding the optimal kernel parameter both on an artificial dataset and a real-world application.Artificial Neural Networks --- ICANN 2002info:eu-repo/semantics/publishe
Object oriented design of a simulator for large BP Neural Networks
No full textIn this paper we describe the implementalion of the backpropagation aIgorilhm by means of an object oriented library (ARCH). The use of this library relieves the user from the details of a specific parallel programming
machines and at the same time allows a greater portability oí the generated code.
To provide a comparison with existing solutions, we survey the most relevant implementations oí the algorthm
proposed so far in the lilerature, bolh on dedicaled and general purpose computers.
Extensive experimental results show that the use of tbe library dos not hurt the performance of our
simulator, on the contrary our implementation on a connection Machine (CM-S) is comparable wilh the
fastest in its calegory
An Ontology Based Method to Solve Query Identifier Heterogeneity in Post-Genomic Clinical Trials
No full textThe increasing amount of information available for biomedical research has led to issues related to knowledge discovery in large collections of data. Moreover, Information Retrieval techniques must consider heterogeneities present in databases, initially belonging to different domains—e.g. clinical and genetic data. One of the goals, among others, of the ACGT European is to provide seamless and homogeneous access to integrated databases. In this work, we describe an approach to overcome heterogeneities in identifiers inside queries. We present an ontology classifying the most common identifier semantic heterogeneities, and a service that makes use of it to cope with the problem using the described approach. Finally, we illustrate the solution by analysing a set of real queries
Genetic and morphological evidence for a new cryptic species of Ectinogonia (Coleoptera: Buprestidae) from central Chile
No full textAnguita-Salinas, Simón, Barahona-Segovia, Rodrigo M., Poulin, Elie, Zúñiga-Reinoso, Alvaro (2017): Genetic and morphological evidence for a new cryptic species of Ectinogonia (Coleoptera: Buprestidae) from central Chile. Zootaxa 4303 (2): 284-292, DOI: https://doi.org/10.11646/zootaxa.4303.2.
Fast training of Support Vector Machines for regression
No full textWe propose here a fast way to perform the gradient computation in Support Vector Machine (SVM) learning, when samples are positioned on a m-dimensional grid. Our method takes advantage of the particular structure of the constrained quadratic programming problem arising in this case. We show how such structure is connected to the properties of block Toeplitz matrices and how they can be used to speed-up the computation of matrix-vector product
A learning-machine based method for the simulation of combustion process in automotive I.C.Engines.
No full textIn automotive applications problems related to management and diagnostics play an important role to improve engine perfonnance and to reduce fuel consumption and pollutant emissions. In the design of control systems the use of theoretical models for the simulation of engine behaviour proved to be very useful, and it is apparent from the literature.
However, since automotive engines have become very complex plants, their modelling requires a comprehensive description of the behaviour of many processes and components. Combustion process has a strong influence on perfonnance and emissions, but its theoretical description can be hardly combined with the requirements of control-oriented models (especially as regards "real-time" applications).
Two simplified theoretical models are proposed in the
paper, based on a thennodynamic and a simplified approach
respective)y. In the first case a single-zone method was
followed with the introduction of an apparent heat release rate (HRR) described as a superposition of two Wiebe functions.
Coefficients of these burning functions are estimated by means of Learning Machines (LM), i.e. Support Vector Machines (SVM), trained from experimental data and then embedded in a Simulink block
The discarded cow from the flowered desert: revalidation of Gyriosomus crispaticollis Fairmaire, 1886 stat. rev. (Coleoptera: Tenebrionidae) in Southern Atacama, Chile
No full textGuerrero, Marcelo, Diéguez, Víctor M., Anguita-Salinas, Simón, Zúñiga-Reinoso, Álvaro (2023): The discarded cow from the flowered desert: revalidation of Gyriosomus crispaticollis Fairmaire, 1886 stat. rev. (Coleoptera: Tenebrionidae) in Southern Atacama, Chile. Zootaxa 5319 (2): 283-291, DOI: 10.11646/zootaxa.5319.2.9, URL: http://dx.doi.org/10.11646/zootaxa.5319.2.
RAIN: Redundant Array of Inexpensive workstations for Neurocomputing
No full textWe describe here the project RAIN, started at the beginning
of 1997 and aimed to demonstrate the use of High Performance Computing and Networking technologies in neura! network applications for industry and medicine. The target architecture of the demonstrators will be a cluster of workstations: this choice will aIlow a Iow-cost implementation and, at the same time, wilI provide sorne insight on the use of this relatively new (at least outside the academic world) parallel architecture.
Several communication networks will be tested ranging from 10 Mb/s Ethernet to 155 Mb/s ATM
Ectinogonia cryptica Anguita-Salinas & Barahona-Segovia & Poulin & Zúñiga-Reinoso 2017, sp. n.
No full text<i>Ectinogonia cryptica</i> sp. n. Anguita-Salinas & Zúñiga-Reinoso <p>(Fig. 1)</p> <p> <b>Type locality.</b> Chile, Ñuble, Pinto, Las Comadres (- 36.88905°S, - 71.56277°W).</p> <p> <b>Type material.</b> Holotype ♂. (MNNC) Chile, Provincia del Ñuble, Pinto, Las Comadres (36.887703°S, 71.567068°W). 22.I.2016. leg. S. Anguita S.. Paratypes: Chile, Provincia de Curicó: 1 ind. 1 ♂. (MNHN). Molina, El Radal. I.1957. leg. (?). Curicó, La Tabla. 1 ind. 1 ♂. (MNHN). 29.IX.1943. leg. L. E. Peña G. XI.1943. 1 ind. 1 ♂. (MNHN). leg. L. E. Peña G. 1 ind. 1 ♀. (MZUC). Curicó, Licantén. 18.XII.1993. leg. T. Moore. 1 ind. 1 ♀. (MZUC). Curicó, Cerro Condel. 4.XI.1999. leg. T. Moore. Provincia de Talca: 1 ind. 1 ♀. (MZUC). Talca. XII.1978. leg. L. E. Peña. 1 ind. 1 ♀. (MCPC). Constitución. X.2003. leg. M. Cid B. 1 ind. 1 ♀. (MCPC). Alto Pangal. XII.1999. leg. M. Cid. B. Provincia del Ñuble: 2 ind. 2 ♀. (MZUC). Pinto, Piedras Comadres. 12/ 19.I.1994. leg. T. Moore. Pinto, Las Comadres. 6 ind. 4 ♂ 2 ♀. 14.XI.2015. leg. S. Anguita. (SAPC). 3 ind. 1 ♂ 2 ♀. (SAPC). 22.I.2016. leg. S. Anguita. Pinto, Las Trancas. 1 ind. 1 ♂. (MEUC). 12/ 15.IV.1966. leg. L. E. Peña G. 4 ind. 2 ♂ 2 ♀. (MZUC). I.1971. leg. T. Moore. 3 ind. 1 ♂ 2 ♀. (MZUC). III.1971. leg. T. Moore. 1 ind. 1 ♀. (MZUC). I.1976. leg. T. Moore. 28 ind. 16 ♂ 12 ♀. (MZUC). XII.1988. leg. T. Moore. 1 ind. 1 ♀. (MZUC). I.1989. leg. T. Moore. 1 ind. 1 ♂. (MZUC). 2.I.1998. leg. T. Moore. 2 ind. 1 ♂ 1 ♀. (RBPC). 14.XII.2007. leg. R. Barahona. Pinto, La Invernada. 1 ind. 1 ♂. (MEUC). IV.1966. leg. (?).3 ind. 2 ♂ 1 ♀. (MNHN). 1967. leg. L. E. Peña G. 5 ind. 2 ♂ 3 ♀. (MEUC). I.1967. leg. Ocare. 1 ind. 1 ♀. (MZUC). I.1970. leg. T. Moore. Pinto, Puente Marchant. 1 ind. 1 ♀. (MZUC). 18.I.1997. leg. T. Moore. 13 ind. 4 ♂ 9 ♀. (MZUC). 15/ 30.XI.1997. leg. T. Moore. 2 ind. 1 ♂ 1 ♀. (MZUC). Pinto, Las Cabras. 7.I.1973. leg. G. Monsalve. 12 ind. 5 ♂ 7 ♀. (MZUC). Pinto, Los Lleuques. XI.1999. leg. J. Mondaca E. 7 ind. 3 ♂ 4 ♀. (MZUC). Pinto, Recinto. I.1976. leg. T. Moore. 1 ind. 1 ♂. (MZUC). Bulnes, Puente Quitasol. 29.VI.1995. leg. R. C. Caro. 2 ind. 1 ♂ 1 ♀. (CPAR). San Fabian, Pichi Rincón. 19.I.2010. leg. A. Ramirez. 2 ind. 1 ♂ 1 ♀. (CPAR). Estero Bullileo, San Fabian de Alico. 19.I.2011. leg. A. Ramirez. Cordillera Chillan. 6 ind. 2 ♂ 4 ♀. (MEUC). XI.1970 / II.1971. leg. Ocare. 1 ind. 1♂. (MNHN). 3.XII.1978. leg. G.Morena C. 1 ind. 1 ♀. (MNHN). 13/ 23.I.1983. leg. G.Morena C. Provincia del Bio Bio: 2 ind. 2 ♂. (MNHN). Yumbel. I/ II.1975. leg. P. Cancino. 1 ind. 1 ♂. (MZUC). Cabrero, Salto del Laja. 14.XII.1988. leg. T. Moore. 1 ind. 1 ♀. (MZUC). Cabrero. 19.X.1994. leg. C. Aracena. 4 ind. 2 ♂ 2 ♀. (MZUC). Antuco. 15.I.1987. leg. T. Moore. 11 ind. 3 ♂ 8 ♀. (MZUC). Antuco, El Toro. 15.I.1992. leg. T. Moore. Provincia del Concepción: Florida. 1 ind. 1 ♀. (MZUC). 19.IX.1962. leg. Mendez. 1 ind. 1 ♀. (MZUC). 15.XII.1962. leg. (?). Concepcion, 1 ind. 1 ♀. (MZUC). Bellavista. 4.IV.1969. leg. Artiguez. Provincia de Malleco: 1 ind. 1 ♀. (MZUC). Angol. 1.XII.1936. leg. (?).Provincia de Arauco: 1 ind. 1 ♂. (MZUC). Cañete, Chacay. 18.X1963. leg. Moyano.</p> <p> <b>Diagnosis.</b> Based on the holotype: Dark graphite back (<i>E. buqueti</i> with dorsal surface copper or bronze). Costae on the elytra slightly prominent, delimited by lines of shallow punctation and some striae (<i>E. buqueti</i> and <i>E. intermedia</i> with deep punctation and striae). Elytral lateral margin heavily crenulated in the proximal quarter (<i>E. catenulata</i> with incipient or non existent crenulations). Elytral disc decorated with transverse and reticulated rugosities between the elytral suture and the first costa. (<i>E. buqueti</i> and <i>E. intermedia</i> are distinctly decorated with a simple wrinkle) (Fig. 1 A).</p> <p> <b>Description.</b> Body length 19.5mm. Dorsal side dark graphite black with coppery shine, ventral side and legs bronze.</p> <p> <b>Head.</b> Dark graphite black and coppery. Labrum heavily punctate, anterior margin straight, with tufts of long setae at the corners. Short hairs uniformly distributed over the entire surface. Frontoclypeus wrinkled with long setae on the surface, concentrated to the central axis, clypeal suture not visible. Frons wrinkled with abundant long setae concentrated to the lateral margins. Vertex wrinkled forming raised carinae. Mentum semi rough and with long setae concentrated in the central axis. Antennae black with thin white pilosity. Antennae reach 1/3 of length of pronotal margin. First antennomere longer and wider than antennomeres II and III. Antennomeres IV–VI of similar size. Antennomeres VII–XI smaller than antennomeres IV–VI.</p> <p> <b>Thorax.</b> Pronotum glabrous with strong punctation laterally, narrowest in the anterior third. Anterior angles rounded. Anterior margin slightly bisinuate, with setae scattered on the anterior margin. Posterior margin glabrous and slightly bisinuate. Lateral margins glabrous, crenulated, curved forward in the anterior half and almost straight in the posterior half. Posterior angles semi-raised and acute angled. Pronotal disc with two subparallel wide carinae that converge towards the anterior margin, with sparse isolated punctures, with a concentration of small punctures between carinae. Longitudinal middle carina slightly raised and semi-wrinkled. Proepisternum wrinkled and with sparse setae. Prosternum irregularly punctate with short sparse pilosity. Prosternal process cuneiform, with few punctures and longer setae in the distal portion and with a tuft of setae at the apex. Mesosternum depressed longitudinally in the central axis, with uniform setae in the depression and abundant disorganised long setae on the lateral margins. Metasternum subcaniculate on the central axis, with sparse deep punctation and sparse white setae.</p> <p> <b>Elytra.</b> With four slightly raised costae, delimited by lines of shallow punctures. Costae interrupted by concentrated areas of fine punctures. Lateral margin heavily crenulated in the basal fourth; barely noticeable in the distal fourth. Elytral disc slightly enhanced, wrinkled and punctured. The rugosities converge from the first costa towards the elytral suture and scutellum. Punctures concentrated at the basal end of the elytral disc. Intercostal space between costa II and elytral margin with white pilosity in the basal half. Elytral suture enhanced and smooth after the basal third. Elytral epipleura with scattered medial setae in the distal third.</p> <p> <b>Abdomen.</b> Ventrites with scattered thick white medial setae, increasing in density toward the lateral margins. Ventrite I has a bare area at the center, of subrectangular shape that continues uninterrupted onto ventrite II. Ventrite V with distal margin subtruncate.</p> <p> <b>Legs.</b> Bronze color. Coxae dotted and with abundant white setae in the base. Trochanter with scarce pilosity. Femora punctate, with setae, longer in the lower face. Tibial punctures with short setae more abundant on the lower face. Tarsi with abundant setae in the upper face. Each tarsus with simple claws.</p> <p> <b>Male genitalia</b> (Fig. 1 B). Parameres heavily sclerotized, almost parallel sided narrowing at apical and a basal ends, apically terminated with an elongated sensorial process with scarce long sensory setae. Median lobe produced at apex in a strongly sclerotized V shaped process, followed by a longitudinally groove. Basal lamina of tegmen wider than long, ending in a subcurved margin.</p> <p> <b>Variability.</b> Width and development of carinae variable; coloration ranging from copper, graphite and black, and enhancement of pronotal disc.</p> <p> <b>Sexual dimorphism.</b> Females larger than males. Average length (standard deviation): male = 18.6 mm (±1.9) and female= 21.3 mm (±1.9). Distal margin of last ventrite is subtruncate in males, in females distal margin of last ventrite is subcurved.</p> <p> <b>Genetic differentiation.</b> The unrooted NJ tree showed four separated and highly supported groups, each one containing the sequences of a single species (Fig. 1 C). The genetic distance between <i>E. cryptica</i> <b>sp. n.</b> with other species (i.e. <i>E. buqueti</i>, <i>E. intermedia</i> and <i>E. speciosa oscuripennis</i>) was greater than 4.6% and statistically significant (see Table 2.). According with the NJ tree and p-distances, <i>E. cryptica</i> <b>sp. n.</b>, <i>E. buqueti</i> and <i>E. speciosa oscuripennis</i> exhibited similar genetic distances amongst them (4.2% to 5.4%) and low intraspecific genetic variability (0.3% to 0.8%) while <i>E. intermedia</i> showed higher values of both p-distance and genetic variability (Fig. 1 C).</p> <p> <b>Etymology.</b> The specific epithet “ cryptica ”, is an adjective, feminine that refers to the Greek word <i>kryptikos</i> that means hidden or enigmatic, because the species was not recognized and classified as <i>E. buqueti</i>.</p> <p> <b>Distribution and Bionomy.</b> Chile, Maule and Bio Bio regions: Curicó, Talca, Linares, Ñuble, Biobío, Concepción and Arauco provinces (Fig. 2 A). Foothills of the Andes Range and Coast Range in Concepción and Arauco provinces, close to the 1000 meters in environments with open xerophytic scrublands (Fig. 2 B). The adults were found associated with <i>Colletia spinossisima</i> and <i>C. hystrix</i> (Rhamnaceae) (Fig. 2 C).</p>Published as part of <i>Anguita-Salinas, Simón, Barahona-Segovia, Rodrigo M., Poulin, Elie & Zúñiga-Reinoso, Alvaro, 2017, Genetic and morphological evidence for a new cryptic species of Ectinogonia (Coleoptera: Buprestidae) from central Chile, pp. 284-292 in Zootaxa 4303 (2)</i> on pages 286-289, DOI: 10.11646/zootaxa.4303.2.8, <a href="http://zenodo.org/record/840968">http://zenodo.org/record/840968</a>
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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