Search results for "PGA"
showing 10 items of 244 documents
Rīgas apgaismes tehnikas rūpnīcas darbība no 1958.-1991.gadam
2016
PSRS rūpniecības vēsture ir interesanta un maz pētīta nozare, kas aktuāla arī mūsdienās, jo sekas atstājušas ietekmi ne tikai uz ekonomiku, bet arī uz lielas sabiedrības daļas domāšanas veidu. Tādēļ nepieciešami jauni pētījumi, kas raksturotu un analizētu PSRS ekonomikas pozitīvos un negatīvos aspektus. Uzmanība pievērsta konkrētam rūpniecības uzņēmumam - Rīgas apgaismes tehnikas rūpnīcai. Rūpnīcas darbībā redzamas problēmas, ko sagādāja ekonomikas plānošana pa piecgades periodiem, kas bija jāizpilda par katru cenu, neraugoties uz neprecīzajiem aprēķiniem un nepielāgojoties tirgus situācijai. Tas noveda pie izejmateriālu deficīta, sliktas kvalitātes ražojumiem un nespējas konkurēt ne tikai …
Simulation and experimental validation of multicarrier PWM techniques for three-phase five-level cascaded H-bridge with FPGA controller
2017
The FPGA represents a valid solution for the design and implementation of control systems for inverters adopted in many fields of power electronics because of its high flexibility of use. This paper presents an overview and an experimental validation of the MC SPWM techniques for a three-phase, five-level, cascaded H-Bridge inverter with FPGA controller-based. Several control algorithms are here implemented by means of the VHDL programming language and the output voltage waveforms obtained from the main PWM techniques are compared in terms of THD%. Simulation and experimental results are analyzed, compared and discussed.
Parallel and scalable short-read alignment on multi-core clusters using UPC++
2016
[Abstract]: The growth of next-generation sequencing (NGS) datasets poses a challenge to the alignment of reads to reference genomes in terms of alignment quality and execution speed. Some available aligners have been shown to obtain high quality mappings at the expense of long execution times. Finding fast yet accurate software solutions is of high importance to research, since availability and size of NGS datasets continue to increase. In this work we present an efficient parallelization approach for NGS short-read alignment on multi-core clusters. Our approach takes advantage of a distributed shared memory programming model based on the new UPC++ language. Experimental results using the …
Classifier Optimized for Resource-constrained Pervasive Systems and Energy-efficiency
2017
Computational intelligence is often used in smart environment applications in order to determine a user’scontext. Many computational intelligence algorithms are complex and resource-consuming which can beproblematic for implementation devices such as FPGA:s, ASIC:s and low-level microcontrollers. Thesetypes of devices are, however, highly useful in pervasive and mobile computing due to their small size,energy-efficiency and ability to provide fast real-time responses. In this paper, we propose a classi-fier, CORPSE, specifically targeted for implementation in FPGA:s, ASIC:s or low-level microcontrollers.CORPSE has a small memory footprint, is computationally inexpensive, and is suitable for…
An Embedded Biometric Sensor for Ubiquitous Authentication
2013
Communication networks and distributed technologies move people towards the era of ubiquitous computing. An ubiquitous environment needs many authentication sensors for users recognition, in order to provide a secure infrastructure for both user access to resources and services and information management. Today the security requirements must ensure secure and trusted user information to protect sensitive data resource access and they could be used for user traceability inside the platform. Conventional authentication systems, based on username and password, are in crisis since they are not able to guarantee a suitable security level for several applications. Biometric authentication systems…
Apgaismojuma izpēte impresionisma mākslinieku gleznojumos 4. klases vizuālās mākslas stundās
2019
Darba autore Elizabete Šulte ir izstrādājusi diplomdarbu, kura tēma ir “Apgaismojuma izpēte impresionisma mākslinieku gleznojumos 4. klases vizuālās mākslas stundās”. Mērķis ir izpētīt kā impresionisma mākslinieki gleznoja apgaismojumus darbā ar 4.klases skolēniem vizuālās mākslas stundās. Diplomdarbs ir veidots no trīs daļām. Pirmajā daļā ir izpētīta impresionisma vēsture un attīstība; otrajā daļā tika veikta teorētiska māksliniecisko izteiksmes līdzekļu izpēte, kas saistīta ar impresionisma mākslas virzienu. Diplomdarba trešajā daļā ir izveidota uzdevumu kopa, kas atbilst skolēnu vecumposmam, uzdevumu kopas aprobācija un secinājumi. Noslēguma veikti secinājumi par diplomdarbu. Diplomdarbs…
A Decision-Tree Approach to Assist in Forecasting the Outcomes of the Neonatal Brain Injury
2021
Neonatal brain injury or neonatal encephalopathy (NE) is a significant morbidity and mortality factor in preterm and full-term newborns. NE has an incidence in the range of 2.5 to 3.5 per 1000 live births carrying a considerable burden for neurological outcomes such as epilepsy, cerebral palsy, cognitive impairments, and hydrocephaly. Many scoring systems based on different risk factor combinations in regression models have been proposed to predict abnormal outcomes. Birthweight, gestational age, Apgar scores, pH, ultrasound and MRI biomarkers, seizures onset, EEG pattern, and seizure duration were the most referred predictors in the literature. Our study proposes a decision-tree approach b…
Brief an Johann G. Herder.
1799
Ms. 930a, Nr. 17, Bl. 43r-44v Garlieb H. Merkel. Brief an Johann G. Herder. Berlin, d[en] 9ten März 1799 Autora rokraksts / Autograph, vācuval. / Deutsch [4] lpp. / S. Attēlu numuri / Bildnummern: 930a-017-1, 930a-017-2-3, 930a-017-4 Wahrscheinlich handelt es sich bei diesem Dokument um ein Konzeptdes Briefes von Merkel an Herder; es ist also nicht gesichert, ob dieser in Reinschrift verfasst undan den Adressaten abgeschickt wurde. Merkel schreibt sehr persönlich über sich selbst und versucht das Bild eines draufgängerischen Lebemannes zu geben, der seinen Horizont, wenn möglich, lieber durch eigene Erfahrungen als durch Buchlektüre erweitern will. Merkel weiß, dass er diese Sichtweise mit …
A new control system prototype for the energy production maximization of a unequally irradiated PV system
2011
This paper deals with the mismatch effect due to a unequally irradiation on a PV (PhotoVoltaic) system. The mismatch effect due to the partial shading of a PV module can be limited thanks to the installation of both bypass and block diodes. Unfortunately, this solution cannot fully solve the disvantages related to the mismatch effect. The Authors, in previous papers [1, 2], have theoretically demonstrated that the mismatch effect can be solved by changing the parallel/series connections of the modules of a PV system, taking into account each module radiating condition. This paper represents a first step of the experimental development of the above mentioned theoretical result. Specifically,…
Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger
2020
The PreProcessor of the ATLAS Level-1 Calorimeter Trigger prepares the analogue trigger signals sent from the ATLAS calorimeters by digitising, synchronising, and calibrating them to reconstruct transverse energy deposits, which are then used in further processing to identify event features. During the first long shutdown of the LHC from 2013 to 2014, the central components of the PreProcessor, the Multichip Modules, were replaced by upgraded versions that feature modern ADC and FPGA technology to ensure optimal performance in the high pile-up environment of LHC Run 2. This paper describes the features of the newMultichip Modules along with the improvements to the signal processing achieved.