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Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Aleksandra Świetlicka"

» Parallel simulation of stochastic denritic neurons using NVidia GPUs with CUDA

Karol Gugała

Aleksandra Świetlicka

Agata Jurkowlaniec

Andrzej Rybarczyk

Hodgkin-Huxley model has been experimentally proved over years great usefulness in describing action potentials of neural cells. Model explains initiation and propagation of action potentials in the giant squid axon, which is very useful in case studies on action potentials [9] in biological neural networks. For work in this matter Alan Hodgkin and Andrew Huxley receive Nobel prize in 1963. Main disadvantage of mentioned model is it computational complexity, thus high demand of computational power and time expensive simulations. We consider computational simplification of model by transformation from deterministic to stochastic one. This transformation simplifies model by replacement part of differential equations derived by it with draw from normal distribution. To decrease time of simulations we decide to use parallel computing. High number of simple floating point operations led us to use GPUs in simulation tasks. In this paper we present simple dendritic neurons in tree like structures tissues simulator based on NVidia GPU written in CUDA C. We present transformation from deterministic Hodgkin - Huxley model to stochastic one. Parallelisation of simulation task of dendritic neurons in aforementioned tissues is presented. Also implemented simulator parallel algorithm is discussed. Hodgkin-Huxley kinetic model Deterministic model is given with the set of equations, where the main equation is of the form (1). Other equations are obtained from the Markov kinetic schemes,[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2011/12

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» Ideal traffic system creator

Janusz Pochmara

Aleksandra Świetlicka

An effective distribution of goods must assure the movement of products and materials from the supplier’s warehouses to the customer’s objects at the possibly lowest cost. This means that the distribution costs, such as the costs of transport, supply and administration are to be reduced, which requires the improvement of the customers service standards at the same time. The improvement of customers service standards manifest mainly in on-time delivery. The on-time delivery is connected with formation of the transport standards in order to keep it on time [1]. In logistics, every distribution system is a fundamental component of a market economy which must consist of: ● tracking and tracing system, ● monitoring with GSM/GPS communication system, ● alerts system, while is transit, ● route optimization in real time system, ● safeguarding people system, ● pay per use possibility. Combining these systems together with wireless technology makes it possible to track down and trace vehicles, goods shipments, employees and mobile resources. It therefore supports logistics companies that need to constantly monitor the flow of goods they transport. This also implies an organization and synchronization of flows through nodes and network strategies. When drivers get stuck in a traffic jam, their level of stress rises rapidly. It is connected with anxiety of being late or missing an appointment (time and money loss), impossibility to predict a journey time, wasting fuel or breathing in exhaust fumes [2]. Consequently, stressful life can lead to many diseases, such as heart attack, increased blood pressure, migraine headaches etc. [...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2012/4

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