Databases are the fundamental component of an application for storing data. SQL (Structured Query Language) is a query language that is used to create, read, update, and remove records in most relational databases (CRUD operations). Because new relational database management systems have arisen, it is useful to compare some of them when linked to a Java application using Spring Data JPA. The time for each CRUD activity is analyzed for thousands and hundreds of thousands of entries. The motivation is to find the most performant combination for an application, considering its size (number of entries).
Local governments and battery manufacturers will have a serious problem once the batteries from first generation of electric vehicles will reach the End of Life. These batteries are retired because they do not comply with automotive safety regulations and transportation laws. Even so they still have about 80% of their initial capacity, which makes them suitable in other less demanding applications. However, they must first undergo an extensive evaluation to identify batteries with similar characteristics so that new battery packs can be made. This paper presents the development and testing of a multi-chemistry, multi-battery state of health screening system. The design is based on a bidirectional DC-DC cascaded Buck-Boost power converter that allows simultaneous testing of two or more cells, despite their chemistry.
The temperature regime of electronic modules is crucial for their reliable operation. This study deals with the implementation of a system for experimental investigation of the temperature field of electronic devices with the use of thermal camera. The main dependencies are described so that the pixel area can be obtained and the pixels can be classified into different temperature zones. Furthermore, an algorithm of the system has been developed, which describes the process of implementing an experimental investigation of the temperature field. The brain of the system is a microcontroller, which is responsible for obtaining the sensors readings and manipulating the heater and fan. It is connected with a personal computer, which allows to obtain and store the experimental data as time series for further analysis. The developed system could be used to implement planned experiments, the data from which is appropriate for creation and verification of thermal models of electronic devices.
Intracranial hemorrhage (ICH) is a common stroke type that requires an early and urgent diagnosis. The standard imaging modality for ICH diagnosis is computed tomography (CT). However, the type of hemorrhage must be identified by the neurologist to make an effective treatment decision. Although available traditional methods and deep learning-based algorithms for ICH detection can achieve excellent performance, the classification and segmentation of ICH images are difficult tasks since multiple types of ICH may exist within the CT image. Localizing ICH through a bounding box is a more straightforward task than the semantic segmentation task where the model tries to classify pixel-wise. In this work, the YOLOv3 model is proposed to localize mixed hemorrhages from CT images. Additionally, a pipeline for data augmentation was applied to address the problem of limited bounding box annotations for ICH detection. The YOLOv3 model has been evaluated and validated on the brain hemorrhage extended dataset. The proposed method achieved competitive results against state-of-the-art methods.
In this paper, the impact of different photovoltaic power plants (PVPPs) reactive power control strategies upon a microgrid operation are compared. The first strategies consist in operating the PVPPs at unitary or fixed power factor values, while a local load compensation strategy and an optimal reactive power control strategy, based on the Grey Wolf Optimizer (GWO), are also employed. The microgrid operation is simulated for a one-year period with a one-hour granulation for all considered strategies, and the active power losses, reactive power import and bus voltage levels are compared.
