Ya está disponible nuestro nueva publicación.

Developing an intelligent system for the prediction of soil properties with a portable mid-infrared instrument.

Highlights

Hoy nos han comunicado la publicación de un nuevo artículo, con el que llevábamos trabajando desde el año pasado.

High-Throughput Infrastructure for Advanced ITS Services: A Case Study on Air Pollution Monitoring.

Abstract:

Novel cooperative intelligent transportation systems (ITS) serve as the basis for the provision of a number of services for drivers, occupants, and third parties. The vast amount of information to be collected, especially in vehicle-to-infrastructure (V2I) communication services, requires new algorithms and hardware platforms to cope with real-time requirements; however, this combination is not properly addressed in the literature. In this paper, we introduce a high-throughput hardware-software infrastructure to gather information from vehicles and efficiently process it to provide novel ITS services. We propose a parallelization approach of a fuzzy clustering technique on heterogeneous servers based on CPU and several GPUs, tailored to classification problems in V2I. The infrastructure is empirically tested to offer a geo-located pollution information service through the periodical collection of both vehicle’s position and status data. We offer a real service that correctly identifies highly polluting traffic areas and drivers. The results indicate a good performance of the system under high loads, and our scalability analysis reveals a good operation in real-ambitious deployments thanks to the use of the both CPU and multiple GPUs, showing that our proposal can efficiently host cooperative services involving high processing in the ITS context.

Otra artículo que nos publican: A novel fuzzy clustering approach to regionalise watersheds with an automatic determination of optimal number of clusters. Una nueva aplicación de los algoritmos de clasificación difusa.

Abstract

One of the most important problems faced in hydrology is the estimation of flood magnitudes and frequencies in ungauged basins. Hydrological regionalisation is used to transfer information from gauged watersheds to ungauged watersheds. However, to obtain reliable results, the watersheds involved must have a similar hydrological behaviour. In this study, two different clustering approaches are used and compared to identify the hydrologically homogeneous regions. Fuzzy C-Means algorithm (FCM), which is widely used for regionalisation studies, needs the calculation of cluster validity indices in order to determine the optimal number of clusters. Fuzzy Minimals algorithm (FM), which presents an advantage compared with others fuzzy clustering algorithms, does not need to know a priori the number of clusters, so cluster validity indices are not used. Regional homogeneity test based on L-moments approach is used to check homogeneity of regions identified by both cluster analysis approaches. The validation of the FM algorithm in deriving homogeneous regions for flood frequency analysis is illustrated through its application to data from the watersheds in Alto Genil (South Spain). According to the results, FM algorithm is recommended for identifying the hydrologically homogeneous regions for regional frequency analysis.

Contribución Workshop Proceedings of the 13th International Conference on Intelligent Environments, Seoul, Korea, August 2017.

Abstract

The determination of carbon is one of the most important in soil analysis. However traditional techniques are costly and time consuming. In this manuscript we propose an alternative predictive approach based on portable mid-infrared spectroscopy data modeled by machine learning techniques. We evaluate the performance of different machine learning models and sample size to predict soil carbon in 457 Australian soils. The results show a good performance of the models. All models are validate by statistical tests. The best performing technique with a 99% of confidence level is the Gaussian Process providing a 98% of accuracy for the prediction of soil carbon. Moreover, this technique is the most robust for the different sample sizes tested. When compared with the commonly used Partial Least Squares Regression technique, the machine learning approaches provide more successful and balanced results.

Interesante Webinars de cómo MatLab trata grandes conjuntos de datos

Big Data con MATLAB
Paz Tárrega, MathWorks

Descripción general

Según crecen nuestros datos en tamaño y complejidad, se hace más difícil trabajar con ellos, particularmente cuando los datos no caben en memoria. MATLAB ofrece un entorno único para trabajar con big data conviertiendo el análisis y el proceso de big data en fácil, coveniente y escalable.

En este webinar aprenderá estrategias y técnicas para manejar grandes volúmenes de datos en MATLAB. Se muestran las nuevas capacidades de la versión 2016b de MATLAB, incluyendo tall arrays. Utilizando tall arrays puede prescindir de aprender programación orientada a big data o técnicas de manejo de datos fuera de memoria, simplemente utilice el código y la sintaxis que utiliza hasta ahora de MATLAB.

Las técnicas de Fuzzy Clustering podemos aplicarlas en diferentes campos. En este ejemplo tenemos una colaboración que busca mejorar los métodos QSAR, de técnicas computacionales relacionadas con el cálculo de propiedades fisicoquímicas moleculares.

Abstract

Various methods are used to make the partition of data sets for QSAR development and model validation. In this work we used a fuzzy minimals partitioning and we compare this methodology with another rational partition methods like k-means clustering (KMS) and Minimal Test Set Dissimilarity (MTSD). For the development of QSAR models Ordinary Least Squares (OLS) and Extreme Learning Machine (ELM) methods were used. The generated QSAR equations were validated by the coefficient of determination of the internal leave one out (LOO) cross validation method QLOO 2 and then the coefficient of the external test set Qext 2 was compared between partition methods. The results of this comparison showed that using fuzzy minimal for big and structurally diverse data sets gave an applicability domain similar to KMS and a better predictability models than both methods, KMS and MTSD.