Papers by abraham robinson gutierrez gutierrez
Sensors, 2020
Internet of Things (IoT) projects are increasing in size over time, and some of them are growing ... more Internet of Things (IoT) projects are increasing in size over time, and some of them are growing to reach the whole world. Sensor arrays are deployed world-wide and their data is sent to the cloud, making use of the Internet. These huge networks can be used to improve the quality of life of the humanity by continuously monitoring many useful indicators, like the health of the users, the air quality or the population movements. Nevertheless, in this scalable context, a percentage of the sensor data readings can fail due to several reasons like sensor reliabilities, network quality of service or extreme weather conditions, among others. Moreover, sensors are not homogeneously replaced and readings from some areas can be more precise than others. In order to address this problem, in this paper we propose to use collaborative filtering techniques to predict missing readings, by making use of the whole set of collected data from the IoT network. State of the art recommender systems metho...
Stochastics and Quality Control, 2019
The production network under examination consists of a number of workstations. Each workstation i... more The production network under examination consists of a number of workstations. Each workstation is a parallel configuration of machines performing the same kind of tasks on a given part. Parts move from one workstation to another and at each workstation a part is assigned randomly to a machine. We assume that the production network is acyclic, that is, a part does not return to a workstation where it previously received service. Furthermore, we assume that the quality of the end product is additive, that is, the sum of the quality contributions of the machines along the production path. The contribution of each machine is modeled by a separate random variable. Our main result is the construction of estimators that allow pairwise and multiple comparison of the means and variances of machines in the same workstation. These comparisons then may lead to the identification of unreliable machines. We also discuss the asymptotic distributions of the estimators that allow the use of standar...
Journal of the American Society for Horticultural Science, 1994
The aim of this study was to investigate variability in the sorbitol: sucrose ratio (SSR) in sour... more The aim of this study was to investigate variability in the sorbitol: sucrose ratio (SSR) in source leaves of different peach [Prunus persica (L.) Batsch] cultivars. Four- and 5-year-old trees of 58 cultivars were examined. Mature leaves were sampled on three dates in middle to late summer and analyzed for neutral soluble sugars using high-performance liquid chromatography. Differences in SSRs were observed. In most cultivars, the sorbitol content was at least twice that of sucrose. The maximal range of SSR occurred on the third date and ranged from 1.5 to 4.3. There was a date × genotype interaction (P < 0.01). When cultivars were grouped by country of origin, the mean ratios of the Japanese group were lower than those of the Italian and American groups for all three sampling dates. The SSRs of nectarines were higher than those of peach and canning clingstone-type cultivars. In general, variations in SSR were due mostly to differences in sucrose content. The SSR was negatively c...
Applied Sciences
Visual representation of user and item relations is an important issue in recommender systems. Th... more Visual representation of user and item relations is an important issue in recommender systems. This is a big data task that helps to understand the underlying structure of the information, and it can be used by company managers and technical staff. Current collaborative filtering machine learning models are designed to improve prediction accuracy, not to provide suitable visual representations of data. This paper proposes a deep learning model specifically designed to display the existing relations among users, items, and both users and items. Making use of representative datasets, we show that by setting small embedding sizes of users and items, the recommender system accuracy remains nearly unchanged; it opens the door to the use of bidimensional and three-dimensional representations of users and items. The proposed neural model incorporates variational embedding stages to “unpack” (extend) embedding representations, which facilitates identifying individual samples. It also replac...
Information Theory and Applications, 2007
P systems or Membrane Computing are a type of a distributed, massively parallel and non determini... more P systems or Membrane Computing are a type of a distributed, massively parallel and non deterministic system based on biological membranes. They are inspired in the way cells process chemical compounds, energy and information. These systems perform a computation through transition between two consecutive configurations. As it is well known in membrane computing, a configuration consists in a m-tuple of multisets present at any moment in the existing m regions of the system at that moment time. Transitions between two configurations are performed by using evolution rules which are in each region of the system in a non-deterministic maximally parallel manner. This work is part of an exhaustive investigation line. The final objective is to implement a HW system that evolves as it makes a transition P-system. To achieve this objective, it has been carried out a division of this generic system in several stages, each of them with concrete matters. In this paper the stage is developed by obtaining the part of the system that is in charge of the application of the active rules. To count the number of times that the active rules is applied exist different algorithms. Here, it is presents an algorithm with improved aspects: the number of necessary iterations to reach the final values is smaller than the case of applying step to step each rule. Hence, the whole process requires a minor number of steps and, therefore, the end of the process will be reached in a shorter length of time.
E-Commerce, Refuerzo Para El Desarrollo De La Agricultura Organica
Desarrollo de páginas web con PHP
Novatica Revista De La Asociacion De Tecnicos De Informatica, 2000
Artificial Life and Robotics, Nov 30, 2008
putational power has been settled, many variants are computationally complete. However, the way i... more putational power has been settled, many variants are computationally complete. However, the way in which these models can be implemented is an open problem today. As usually happens, implementation of these systems has been attacked from two different approaches: software and hardware models. On the other hand, the hardware model seems to be the most appropriate-apart from the biological implementation-in order to obtain the massive parallelization that membrane systems claim. Several research works on implementation of P-Systems have been focused on the massively parallel character of the model. In particular, it is possible to fi nd out implementation of P-System on cluster of processors, networks of processors, FPGA's ad hoc designed, and microcontrollers. Most of these solutions have been focused, mainly, in the fi rst phase of the P-System evolution describing digital circuit's architectures/designs for the application of evolution rules inside membranes. The phase of membranes communication has not been contemplated or it has simply been performed by shared memory. Authors do not carry out detailed analysis of the importance of the time costs during communication phase in the total time of P-System evolution. Hence distributed implementation of P-System has met with the communications bottleneck problem. When the number of membranes grows up in the system, the network gets congested and the communication time to execute an evolution step degrades. Recently, several works have presented new communication architectures approaching in the best possible way the inherent features of P-Systems: obtaining a balance between the previous solutions, allowing a certain grade of parallelism in the rules application phase, as well as in the communication phase of a P-System. The goal of this work is to probe the suitability of using microcontrollers in the implementation of these new architectures. This paper is structured in the following way: in the fi rst place, related works are enumerated analyzing the proposed architectures; next the basic unit circuit is introduced. Afterward a hardware model based on this basic unit is presented stating detailed analysis of the architecture. And fi nally conclusions are presented.
Revista espanola de enfermedades digestivas : organo oficial de la Sociedad Espanola de Patologia Digestiva, Jan 22, 2016
Compression of the esophagus by a retroesophageal aberrant right subclavian artery (ARSA) is a ra... more Compression of the esophagus by a retroesophageal aberrant right subclavian artery (ARSA) is a rare cause of dysphagia. We present the case of a 47-year-old female with symptoms of progressive dysphagia diagnosed with dysphagia lusoria using barium swallow and contrast computed tomography and successfully treated with a hybrid procedure: right carotid to subclavian bypass and endovascular insertion of an Amplatzer II Vascular Plug through the right superficial femoral artery. We consider this approach safer, less invasive and more complete to avoid recurrent dysphagia.
Procedure to leach copper concentrates, under pressure and at ambient temperature, by forming a reactive gel in a sulfate-chloride medium
Non-biochemical method to heap leach copper concentrates
This paper presents a new evolution rules application algorithm to a multiset of objects to use i... more This paper presents a new evolution rules application algorithm to a multiset of objects to use in the P system implementation in digital devices. In each step of this algorithm two main actions are carried out eliminating, at least, an evolution rule to the set of active rules. Therefore, the number of operations executed is limited and it can be known a priori which is its execution time at worst. This is very important as it allows for determination of the number of membranes to be located in each processor in the distributed implementation architectures of P systems to obtain optimal times with minimal resources. Although the algorithm is sequential, it reaches a certain degree of parallelism due to a rule that can be applied several times in a single step. In addition to this, this algorithm has shown in the experimental tests that the execution times is better than the ones previously published.
Investigación de los Indicadores de Productividad y Mejores Practicas de la Industria Manufacturera Regiomontana a través de un Estudio de Benchmarking
ABSTRACT
A Web Implemetation of a Generalized Nep
ABSTRACT
Oncotarget, Jan 16, 2015
The epidermal growth factor receptor (EGFR) contributes to the pathogenesis of head&neck squamous... more The epidermal growth factor receptor (EGFR) contributes to the pathogenesis of head&neck squamous cell carcinoma (HNSCC). However, only a subset of HNSCC patients benefit from anti-EGFR targeted therapy. By performing an unbiased proteomics screen, we found that the calcium-activated chloride channel ANO1 interacts with EGFR and facilitates EGFR-signaling in HNSCC. Using structural mutants of EGFR and ANO1 we identified the trans/juxtamembrane domain of EGFR to be critical for the interaction with ANO1. Our results show that ANO1 and EGFR form a functional complex that jointly regulates HNSCC cell proliferation. Expression of ANO1 affected EGFR stability, while EGFR-signaling elevated ANO1 protein levels, establishing a functional and regulatory link between ANO1 and EGFR. Co-inhibition of EGFR and ANO1 had an additive effect on HNSCC cell proliferation, suggesting that co-targeting of ANO1 and EGFR could enhance the clinical potential of EGFR-targeted therapy in HNSCC and might cir...
Searching for the New Technologies of 2010 and Beyond: New Technology Evaluations Conducted in 2006-2009 at the NASA JSC Innovation Partnerships Office
AIAA SPACE 2010 Conference & Exposition, 2010
Lecture Notes in Computer Science, 2009
Nowadays, it is possible to find out different viable architectures that implements P Systems in ... more Nowadays, it is possible to find out different viable architectures that implements P Systems in a distributed cluster of processors. These proposed architectures have reached a certain compromise between the massively parallelism character of the system and the evolution step times. They are based in the distribution of several membranes in each processor, the use of proxies to control the communication between membranes and mainly, the suitable distribution of the architecture in a balanced tree of processors. For a given P-system and K processors, there exists a great volume of possible distributions of membranes over these. The main disadvantage related with these architectures is focused in the selection of the distribution of membranes that minimizes the external communications between them and maximizes the parallelism grade. In this paper, we suggest the use of Self-Organizing Neural Networks (SONN) with growing capability to help in this selection process for a given P-system.
2011 IEEE International Conference on Advanced Information Networking and Applications, 2011
The need to create a standard which unifies data transfer between producing companies and broadca... more The need to create a standard which unifies data transfer between producing companies and broadcasters of live programs will be discussed in the article, as well as examples of services which may be implemented, and the contribution of all parties involved in the processes for carrying out that standard. In this work, a study is conducted on added services which producers may provide to the broadcasters about content; a system is proposed by which additional communication expenses are not made and a model of information transfer is offered which allows low cost developments to supply new media platforms.
Hardware and Software Architecture for Implementing Membrane Systems: A Case of Study to Transition P Systems
Lecture Notes in Computer Science, 2008
... Membrane Systems: A Case of Study to Transition P Systems Abraham Gutiérrez, Luís Fernández,F... more ... Membrane Systems: A Case of Study to Transition P Systems Abraham Gutiérrez, Luís Fernández,Fernando Arroyo, and Santiago Alonso Natural Computing Group - Universidad Politécnica de Madrid 28031 Madrid, Spain {abraham, setillo, farroyo, salonso}@eui.upm.es ...
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Papers by abraham robinson gutierrez gutierrez