Almost Rerere: Learning to resolve conflicts in distributed projects

The concurrent development of applications requires reconciling conflicting code updates by different developers. Recent research on the nature of merge conflicts in open source projects shows that a significant fraction of merge conflicts have limited size (one or two lines of code) and are resolved with simple strategies that use code present in the merged versions. Thus the opportunity arises of supporting the resolution of merge conflicts automatically by learning the way in which developers fix them. In this paper we propose a framework for automating the resolution of merge conflicts which learns from the resolutions made by developers and encodes such knowledge into conflict resolution rules applicable to conflicts not seen before. The proposed approach is text-based, does not depend on the programming languages of the merged files and exploits a well-known and general language (search and replacement regular expressions) to encode the conflict resolution rules. Evaluation results on 14,872 conflicts from 25 projects show that the system can synthesize a resolution for 49% of the conflicts occurred during the merge process (89% if one considers conflicts that have at least one similar conflict in the data set) and can reproduce exactly the same solution that human developers have applied in 55% of the cases (62% for single line conflicts)

Aislamiento e identificacion de secuencias parciales de genes implicados en la bionsintesis de antocianinas en F. chiloensis ssp. chiloensis f. chiloensis

52 P.Las antocianinas son sintetizadas desde un brazo metabólico de los flavonoides. Las enzimas participantes en tales procesos utilizan los productos generados desde la ruta metabólica fenilpropanoide (p-coumaroil CoA) y las generadas en el metabolismo de ácidos grasos (malonil CoA). La biosíntesis de antocianinas se inicia con la reacción catalizada por la enzima chalcona sintasa y consecutivamente participan las enzimas: chalcona isomerasa, flavanona 3-hidroxilasa, dihidroflavonol 4-reductasa y antocianidina sintasa. En la presente memoria se analizaron las secuencias nucleotídicas parciales que codifican para la síntesis de táles enzimas. Para ello se extrajo muestras de RNA de la especie F. chiloensis ssp. chiloensis f. chiloensis, que se caracteriza por presentar bajos niveles de antocianinas. El RNA obtenido fue utilizado para la generación de cDNA, necesario para las reacciones de PCR (Reacción en Cadena de la Polimerasa) realizadas, cuyos productos de amplificación obtenidos, mediante la utilización de partidores específicos, fueron utilizados para la transformación de células competentes, necesarias para obtener una alta cantidad de clones de los productos de amplificación generados. Consiguientemente se realizó una PCR de colonias y sus productos de amplificación fueron secuenciados en Macrogen Inc., Korea. Una vez recibidas las secuencias fueron depuradas y transformadas a secuencias aminoacídicas para su siguiente análisis. Este último consistió en compararlas, mediante alineamientos múltiples, con la estructura primaria de las mismas enzimas, pero pertenecientes a otras especies. Los resultados evidenciaron la existencia de dominios conservados en varias especies de la misma familia a la cual pertenece la especie en estudio. Pero estos dominios desaparecen, en cierta medida, cuando los alineamientos se hacen con especies de diferente familia. Por otra parte, las secuencias obtenidas contienen aminoácidos altamente conservados e importantes desde el punto de vista funcional de las enzimas en estudio. Por lo tanto se puede establecer que, las secuencias parciales de los genes analizados contienen factores que son constantes en las especies analizadas e importantes para el desarrollo de una función enzimática apropiada para la vía biosintética en estudio

Model-Driven Development of Distributed Ledger Applications

Distributed Ledger Technology (DLT) is one of the most durable results of virtual currencies, which goes beyond the financial sector and impacts business applications in general. Developers can empower their solutions with DLT capabilities to attain such benefits as decentralization, transparency, non-repudiability of actions and security and immutability of data assets, to the price of integrating a distributed ledger framework into their software architecture. Model-Driven Development (MDD) is the discipline that advocates the use of abstract models and of code generation to reduce the application development and integration effort by delegating repetitive coding to an automated model-to-code transformation engine. In this paper, we explore the suitability of MDD to support the development of hybrid applications that integrate centralized database and distributed ledger architectures and describe a prototypical tool capable of generating the implementation artefacts starting from a high-level model of the application and its architecture.This preprint has not undergone peer review (when applicable) or any post-submission improvements or corrections. The Version of Record of this contribution is published in Lecture Notes in Computer Science, and a link to the published version will be added when available

Effects of splitter Blade Length on disc pump performance

The disc pump operates using boundary layer principle and viscous drag with a relatively low efficiency. There are methods to increase head and efficiency, one of them is the placing of blades sectors or splitter blades in discs. This method has been applied only in the low viscosity fluids pumping (v < 0.1 stokes). This study describe an experimental research in a hight viscocity fluid (v = 2 stokes) with exit angle (32 = 35° and different splitter blades Lengths (Ls) (75, 50, 25%). The purpose is to determinate the splitter blades length that achieves the most effective combination between the blade effect and boundary layer effect in order to increase the energy transmission efficiency from the impeller to the fluid. As result, it can be established that the use of spliter blades is an alternative to increase the performance of the disc pump. The highest efficiency and head were obtained for the gapsize between two discs (b) of 12 mm using a 50% spliter blades length of the main blade length

Mejoramiento de suelos arcillosos, utilizando cal en la sub rasante de pavimentos, pasaje El Porvenir, sector el Parral, Jaén, Cajamarca 2022

El desarrollo del presente proyecto “Mejoramiento de suelos arcillosos utilizando cal en la sub rasante de pavimentos, pasaje El Porvenir, sector el Parral, Jaén, Cajamarca 2022”. Tiene como objetivos a). de Clasificar las muestras de suelos mediante sus ensayos de granulometría, límites de Atterberg con el método AASTHO y SUCS, b). Determinar el contenido de humedad y la densidad seca del suelo, mediante el ensayo de Proctor modificado y c). Realizar ensayos de Californian Bearing Ratio (CBR), de muestras del suelo en estudio en estado natural y con diferentes con los porcentajes de cal del 7%, 10% y 12%. Cuyos resultados en las tablas muestra las cantidades en porcentaje de material que pasan por los varios tamices la cual se puede apreciar claramente que el material predominante según la clasificación SUCS. En su conclusión los estudios realizados se comprobaron que con una adición de cal del 12% al suelo natural el CBR incrementó, esto significa que el nuevo valor de CBR al 100% de la MDS estabilizado fue de 15.50%

ODIN AD: a framework supporting the life-cycle of time series anomaly detection applications

Anomaly detection (AD) in numerical temporal data series is a prominent task in many domains, including the analysis of industrial equipment operation, the processing of IoT data streams, and the monitoring of appliance energy consumption. The life-cycle of an AD application with a Machine Learning (ML) approach requires data collection and preparation, algorithm design and selection, training, and evaluation. All these activities contain repetitive tasks which could be supported by tools. This paper describes ODIN AD, a framework assisting the life-cycle of AD applications in the phases of data preparation, prediction performance evaluation, and error diagnosis

Survival analysis of author keywords: An application to the library and information sciences area

"This is the peer reviewed version of the following article: Peset, F, F Garzón-Farinós, LM González, X García-Massó, A Ferrer-Sapena, JL Toca-Herrera, and EA Sánchez-Pérez. 2019. "Survival Analysis of Author Keywords: An Application to the Library and Information Sciences Area." Journal of the Association for Information Science and Technology 71 (4). Wiley: 462-73. doi:10.1002/asi.24248, which has been published in final form at https://doi.org/10.1002/asi.24248. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."[EN] Our purpose is to adapt a statistical method for the analysis of discrete numerical series to the keywords appearing in scientific articles of a given area. As an example, we apply our methodological approach to the study of the keywords in the Library and Information Sciences (LIS) area. Our objective is to detect the new author keywords that appear in a fixed knowledge area in the period of 1 year in order to quantify the probabilities of survival for 10 years as a function of the impact of the journals where they appeared. Many of the new keywords appearing in the LIS field are ephemeral. Actually, more than half are never used again. In general, the terms most commonly used in the LIS area come from other areas. The average survival time of these keywords is approximately 3 years, being slightly higher in the case of words that were published in journals classified in the second quartile of the area. We believe that measuring the appearance and disappearance of terms will allow understanding some relevant aspects of the evolution of a discipline, providing in this way a new bibliometric approach.Peset Mancebo, MF.; Garzón Farinós, MF.; Gonzalez, L.; García-Massó, X.; Ferrer Sapena, A.; Toca-Herrera, JL.; Sánchez Pérez, EA. (2020). 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Breaking the configurational anisotropy in Fe single crystal nanomagnets

In this work, we improve the ability to tailor the switching mechanism in nanomagnets by introducing an additional, highly controlled source of anisotropy: magnetocrystalline anisotropy. We analyze the vortex dynamics in single crystal Fe nanotriangles with different orientations of the crystalline axes. By experimental studies and simulation, we show that the angular dependence of the vortex annihilation field springs from the convolution of the crystalline and configurational anisotropies. In contrast, the remanence and the nucleation field present a much simpler behavior controlled by the existence of a single symmetry axis when shape and crystalline orientation are taken into account