Search results for " machine"
showing 7 items of 1317 documents
Overview of Power Electronic Switches: A Summary of the Past, State-of-the-Art and Illumination of the Future.
2020
As the need for green and effective utilization of energy continues to grow, the advancements in the energy and power electronics industry are constantly driven by this need, as both industries are intertwined for obvious reasons. The developments in the power electronics industry has over the years hinged on the progress of the semiconductor device industry. The semiconductor device industry could be said to be on the edge of a turn into a new era, a paradigm shift from the conventional silicon devices to the wide band gap semiconductor technologies. While a lot of work is being done in research and manufacturing sectors, it is important to look back at the past, evaluate the current progr…
Efficient remote authentication
2013
In 2003, Kennel and Jamieson described a method of remote machine authentication. By authentication, the authors meant that the remote machine is non-virtual, and the operating system on the remote machine is not malicious. The described method does not consider the variety of versions of each operating system. The description completely ignores the existence of modules that can be plugged into the operating system. The authors of this paper adapt the method described by Kennel and Jamieson to the real world so that itcan be applied without prior knowledge of theoperating system or the modules on the remote machine. peerReviewed
Design, fabrication and evaluation of an online Intelligent machine for trout beheading and gutting
2021
La clasificación y procesado de pescado empleando máquinas automáticas reduce costes e incrementa el volumen de procesado. Después de su llegada a los mercados de distribución mayorista y minorista, el tamaño de los ejemplares suele ser muy variado para la mayoría de las especies (trucha, caballa, dorada, lubina, etc.). Debido a ello, la limpieza y corte de pescado se realiza habitualmente de forma manual. Este proceso involucra diferentes pasos y a menudo se corta en función de la demanda del usuario: sin cabeza, sin vísceras, sin cabeza ni vísceras, fileteado, etc. Combinando diferentes elementos tecnológicos, hoy en día es posible el desarrollo de sistemas automáticos capaces de mejorar …
Damping Provision by Different Virtual Synchronous Machine Schemes
2020
The adoption of virtual synchronous machine (VSM) schemes for the control of power converters is gaining more and more attention both in academia and industry. The VSM control strategies fall into the category of grid-forming converter controls, and they are intended for a range of different applications, providing specific services and different kinds of support to the grid. The paper investigates the possibility of damping provision to the system by VSM power converters. Different schemes are considered and compared, showing the opportunity of the investigated solutions through combined modal and time domain analyses. A specific modification of the power synchronization loop is recognized…
Sensitivity Analysis and Frequency Dynamics of Grid-Connected Converters with Virtual Inertia
2021
For the participation in the frequency control of the system, power converters can be controlled with different strategies and methods, sharing the common concept of virtual inertia capability. In this work, a sensitivity analysis of two main categories of converter controls with virtual inertia is presented. The considered schemes are a grid-following current vector control with additional virtual inertia block and a grid-forming control scheme based on virtual synchronous machine concept. A proper basis for the comparison is first assessed providing an analytical correlation between the control parameters of the two schemes. For the two control strategies, the sensitivity analysis of the …
Anomaly detection using one-class SVM with wavelet packet decomposition
2011
Anomaly detection has become a popular research topic in the field of machine learning. Support vector machine is one anomaly detection technique and it is coming one the most widely used. In this research, anomaly detection is applied to road condition monitoring, especially pothole detection, using accelerometer data. The proposed concept includes data preprocessing, feature extraction, feature selection and classification. Accelerometer data was first filtered and segmented, after which features were extracted with frequency- and time-domain functions, with genetic programming and with wavelet packet decomposition. A classification model was built using support vector machine and the cal…
Miten konesydän sykkii? Ruotsalainen Hubotit – melkein ihmisiä ei pelkää kysyä isoja kysymyksiä.
2013
Hubotit - melkein ihmisiä (Äkta Människor, Ruotsi 2011-) tuo pohjoismaiseen televisiofiktioon tieteisfiktion tutut teemat kuten ihmisen ja koneen risteymät sekä kuolemattomuuden. Teknologisen kehityksen takana tieteisfiktiossa piilee usein, ellei jopa aina, kysymyksiä kehityksen vaikutuksesta ihmisyyteen. Myös Hubotit - melkein ihmisiä esittää näitä suuria kysymyksiä: Mitä meille tapahtuu teknologian kehittyessä? Voimmeko muuttua joksikin paremmaksi teknologian avulla, vai onko ihmisyys jotain, jota ei voi teknologian avulla luoda tai laajentaa? Millainen voisi olla ihmismielen, -sydämen ja -sielun ohjelmakoodi? nonPeerReviewed