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This is a technical blog dedicated to software development and data analysis, in it you can find articles related to these thematics and free software to download, developed by me.

  • 18/07/2019

    In this second article in the series on combining recurrence quantification analysis (RQA) and neural networks to work with complex time series, we will examine some ideas about possible processing that you can apply to the data and the selection of parameters. We will work using electrocardiographic signals, as mentioned in the previous article.

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    Data analytics related sections viewSections related with the R programTime series with R
  • 11/06/2019

    In some other articles in this blog, I have already written about complex time series, recurrence quantification analysis (RQA) and neural networks. In this series of articles, I will discuss some points to take into account when combining the use of these two tools to identify patterns in complex series, such as detecting anomalies in electrocardiograms or electroencephalograms.

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    Data analytics related sections viewSections related with the R program
  • 28/03/2019

    When we try to learn how to work with time series, it is very useful to have good data sets, and much better if they contain real data. It is difficult to obtain long series, or series presenting interesting and well located and identified patterns, with which we can perform practices. An excellent source of complex time series is our own organism, and everything we can learn by working with them can be extrapolated to any other context.

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    Data analytics related sections viewSections related with the R programTime series with R
  • 18/03/2019

    With this article I conclude the series dedicated to the application of genetic algorithms to the design of neural networks. I will explain the most relevant code of the sample application given with these articles, mainly the classes dedicated to the genes management and the selection process. You can find more information in the previous articles of the series.

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    Data analytics related sections view
  • 28/02/2019

    In this second article on the application of evolutionary algorithms to the optimization of the design of neural networks, I am going to provide a small sample application that allows you to build and train networks, in addition to using this type of algorithms to find the best configuration for a given data set. The application allows generating artificial test data, and I provide the source code for you to be able to modify it, as you want.

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    Data analytics related sections view
  • 22/02/2019

    When we try to apply a neural network to a given problem, finding the most suitable topology for it can be a tedious trial and error task, as well as end up producing a poorly optimized network. To automate this process, we can draw on evolutionary algorithms, inspired in the natural selection of living organisms, which can greatly facilitate our job.

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    Data analytics related sections view
  • 02/12/2018

    One of the most popular algorithms for training multilayer artificial neural networks is the back propagation algorithm, or retro-propagation algorithm. In this article I will try to explain its fundamentals, through a simplified implementation of a neural network that allows testing with different configurations of the network.

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    Data analytics related sections view
  • 23/07/2018

    This article closes the series on posture recognition using the Microsoft Kinect sensor. To finish, I will simply show you the implementation of a basic form that uses the class libraries explained in the previous articles.

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    Sections related to hardware and peripheralsKinect
  • 04/06/2018

    We continue with the series about posture recognition with the Microsoft Kinect sensor. This time I will comment the classes responsible of posture normalization of the body in the way commented in the first article, so that we obtain a series of data that constitute a simplified version of the skeleton most appropriate for analysis using pattern recognition techniques.

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    Sections related to hardware and peripheralsKinect
  • 13/05/2018

    In the previous article of this series I showed the structures, enumerations and classes that the application uses to be independent of the sensor version and the Kinect SDK. In this third article I will show a possible implementation of a class that deals with reading and converting the skeletons using version 2.0 of the SDK, for the Xbox One sensor.

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    Sections related to hardware and peripheralsKinect
  • 05/05/2018

    In this second article in the series about recognition of postures using the Microsoft Kinect sensor I will show generic classes and structs used to isolate the application from the different versions of the SDK. The version of the SDK that we must use depends on the sensor model that we have. In the example code I have used version 2.0, for the Xbox One sensor.

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    Sections related to hardware and peripheralsKinect
  • 22/04/2018

    One of the most interesting features offered by the Microsoft Kinect sensor is human bodies detection, which allows us to develop applications based on the different positions of the user's body and that can be handled remotely using those positions. To do this, it provides a series of points that represent the different joints of the body.

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    Sections related to hardware and peripheralsKinect
  • 11/03/2018

    In previous articles I presented a home video surveillance system, the ThiefWatcher application. It is an extensible application that works combining several protocols, such as cameras, triggers, communication channels and storage systems. In this article I will show how to implement some of these protocols using the Microsoft Kinect sensor.

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    Sections related to hardware and peripheralsKinect
  • 18/02/2018

    The Microsoft Kinect sensor is a very powerful device that provides image capturing, distance measurement and body postures and facial expressions recognition services, which makes it suitable for infinity of applications. In this introductory article I will show how to use it to capture different types of images.

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    Sections related to hardware and peripheralsKinect
  • 10/12/2017

    Solving any Sudoku is a problem that can seem complicated if brute force methods are used, testing each and every one of the possible combinations. But, with the right approach, any of these problems can be solved in a few milliseconds. In this article, I will show you a way to achieve it through an optimized method.

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    Software developingProgramming in csharp languageLogic programming in C#
  • 02/12/2017

    To conclude this series about programming multitasking applications, I will show the use of a simple mechanism that allows implementing asynchronous methods whose waiting times are used for the execution of other parallel tasks or events triggered by user interface controls.

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    Software developingProgramming in csharp languageMultitasking
  • 18/11/2017

    So far I have shown examples of multitasking that block the application until they finished. This is not very useful in practice. Usually, we want that the user can continue interacting with the application while the tasks are running in the background; we could want also the threads to interact with the user interface.

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    Software developingProgramming in csharp languageMultitasking
  • 05/11/2017

    In multitasking applications there is a problem when concurrent access to resources, such as files or memory, when you launch several tasks at once. Two tasks cannot write at the same time in the same memory address, it is required to make sure that some data is not modified while we are reading them or things like that. In this article I will review the tools provided by .NET Framework to deal with these issues.

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    Software developingProgramming in csharp languageMultitasking
  • 19/09/2017

    After reviewing the classes to implement the basic multitasking, in this article I will review different mechanisms that allow a synchronization between various tasks, all of them defined in the System.Threading namespace, with which you can organize the work when the Interactions between tasks require a particular order.

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    Software developingProgramming in csharp languageMultitasking
  • 04/09/2017

    With this article begins a series in which I will review the basic mechanisms provided by the .NET Framework for the implementation of multitasking applications. First of all I will show the basic classes that allow you to launch multiple processes and make a performance comparison between them.

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    Software developingProgramming in csharp languageMultitasking
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