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Wyświetlanie 1-15 z 38
Tytuł:
Modified Distributed Arithmetic Concept for Implementations Targeted at Heterogeneous FPGAs
Autorzy:
Rawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226835.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed arithmetic
FPGA
heterogeneous programmable structures
Opis:
Distributed Arithmetic (DA) plays an important role in designing digital signal processing modules for FPGA architectures. It allows replacing multiply-and-accumulate (MAC) operations with combinational blocks. The quality of implementations based on DA strongly depends on efficiency of methods that map combinational DA block into FPGA resources. Since modern FPGAs have heterogeneous structure, there is a need for quality algorithms to target these structures and the need for flexible architecture exploration aiding in appropriate mapping. The paper presents a modification of DA concept that allows for very efficient implementation in heterogeneous FPGA architectures.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 345-350
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Dynamics in a Bertrand Duopoly Game with Heterogeneous Players
Autorzy:
Dubiel-Teleszyński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/483303.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bertrand duopoly
heterogeneous expectations
nonlinear dynamics
chaos
Opis:
A heterogeneous Bertrand duopoly game with bounded rational and adaptive players manufacturing differentiated products is subject of investigation. The main goal is to demonstrate that participation of one bounded rational player in the game suffices to destabilize the duopoly. The game is modelled with a system of two difference equations. Evolution of prices over time is obtained by iteration of a two dimensional nonlinear map. Equilibria are found and local stability properties thereof are analyzed. Complex behavior of the system is examined by means of numerical simulations. Region of stability of the Nash equilibrium is demonstrated in the plane of the speeds of adjustment. Period doubling route to chaos is presented on the bifurcation diagrams and on the largest Lyapunov characteristic exponent graph. Lyapunov time is calculated. Chaotic attractors are depicted and their fractal dimensions are computed. Sensitive dependence on initial conditions is evidenced.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2010, 2, 2; 95-116
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Input Variable Partitioning Method for Decomposition-Based Logic Synthesis targeted Heterogeneous FPGAs
Autorzy:
Rawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/227236.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
functional decomposition
heterogeneous FPGA
bound set selection
Opis:
The functional decomposition has found an application in many fields of modern engineering and science, such as combinational and sequential logic synthesis for VLSI systems, pattern analysis, knowledge discovery, machine learning, decision systems, data bases, data mining etc. It is perceived as one of the best logic synthesis methods for FPGAs. However, its practical usefulness for very complex systems depends on efficiency of method used in decomposition calculation. One of the most important steps in functional decomposition construction is selection of the appropriate input variable partitioning. In case of modern heterogeneous programmable structures efficiency of methods used to solve this problem becomes especially important. Since the input variable partitioning problem is an NP-hard, heuristic methods have to be used to efficiently and effectively search for optimal or near-optimal solutions. The paper presents a method for bound set selection in functional decomposition targeted FPGAs with heterogeneous structure. This heuristic algorithm delivers optimal or near optimal results and is much faster than other methods.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 1; 15-20
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the Arithmetic Decomposition of DA-LUT Block for Heterogeneous FPGA Structures
Autorzy:
Staworko, M.
Rawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226414.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed arithmetic
FPGA
FIR filter
heterogeneous programmable structures
Opis:
Distributed arithmetic is well known technique of designing FIR filters in FPGA devices. The quality of such filter implementation strongly depends on synthesis results of the DALUT block. Heterogeneity of modern FPGA structures introduces new possibilities into implementation process, that may lead to better results, but also makes it more complicated. This paper presents the simple mathematical model for estimating the necessary FPGA resources to implement DA-LUT using decomposition-based approach. The model takes into account the type of logic cells or memory blocks used for decomposition process. The proposed model is help ful to determinate the DALUT decomposition strategy for further automation of modified distributed arithmetic decomposition method.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 335-344
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distillation profiles in ternary heterogeneous mixtures with distillation boundaries: staged columns
Autorzy:
Królikowski, A.R.
Powiązania:
https://bibliotekanauki.pl/articles/185501.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mieszaniny heterogeniczne
granice destylacji
destylacja
heterogeneous mixtures
distillation
distillation boundaries
distillation profiles
staged column
Opis:
Distillation boundaries originate from saddle azeotropes, dividing the composition space into distillation regions. In heterogeneous mixtures distilled in packed columns, distillation regions overlap. The common area of distillation regions is parametrically sensitive, and it determines the possibilities of crossing (at a finite reflux) the distillation boundaries defined for a total reflux or reboil ratio. This work is an extended research of the paper (Krolikowski et al., 2011) conducted to scrutinize whether the distillation regions overlapped in heteroazeotropic systems distilled in staged columns. Presented studies were performed by finding such composition points of the products, for which the rectifying profiles of staged columns were ended in different distillation regions. Calculations were executed for the heterogeneous mixture classified under Serafimov's topological class as 3.1-2: ethanol - benzene - water. Distillation regions for staged columns were found to overlap each other in the heterogeneous systems. As a result, their common part was parametrically sensitive.
Źródło:
Chemical and Process Engineering; 2012, 33, 2; 207-219
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Styrene epoxidation over heterogeneous manganese (III) complexes
Autorzy:
Kuźniarska-Biernacka, I.
Lisinska-Czekaj, A.
Czekaj, D.
Alves, M. J.
Fonseca, A. M.
Neves, I. C.
Powiązania:
https://bibliotekanauki.pl/articles/958207.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
styrene epoxidation
heterogeneous manganes
Opis:
The manganes (III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese (LTI) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1477-1482
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of N-Propanol Dehydration Process Via Heterogeneous Azeotropic Distillation Using the NRTL Equation
Autorzy:
Wyczesany, A.
Powiązania:
https://bibliotekanauki.pl/articles/185713.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dehydration of n-propanol
heterogeneous azeotropic distillation
dehydratacja n-propanolu
heterogeniczna destylacja azeotropowa
Opis:
Numerical values of the NRTL equation parameters for calculation of the vapour - liquid - liquid equilibria (VLLE) at atmospheric pressures have been presented for 5 ternary mixtures. These values were fitted to the experimental VLLE and vapour - liquid equilibrium (VLE) data to describe simultaneously, as accurately as possible, the VLE and the liquid - liquid equilibria (LLE). The coefficients of this model called further NRTL-VLL were used for simulations of n-propanol dehydration via heterogeneous azeotropic distillation. The calculations performed by a ChemCAD simulator were done for 4 mixtures using hydrocarbons, ether and ester as an entrainer. In majority simulations the top streams of the azeotropic column had composition and temperature similar to the corresponding experimental values of ternary azeotropes. The agreement between the concentrations of both liquid phases formed in a decanter and the experimental values of the LLE was good for all four simulations. The energy requirements were the most advantageous for the simulation with di-npropyl ether (DNPE) and isooctane. Simulations were performed also for one mixture using the NRTL equation coefficients taken from the ChemCAD database. In that case the compositions of the liquid organic phases leaving the decanter differed significantly from the experimental LLE data.
Źródło:
Chemical and Process Engineering; 2017, 38, 1; 163-175
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Spectrum Utilization and Flow Controlling In Heterogeneous Network with Reconfigurable Devices
Autorzy:
Hashmi, S. S.
Sattar, S. A.
Soundararajan, K.
Powiązania:
https://bibliotekanauki.pl/articles/226380.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rate-inference optimization
heterogeneous network
flow control
spectrum utilization
Opis:
Fairness provisioning in heterogeneous networks is a prime issue for high-rate data flow, wherein the inter-connectivity property among different communication devices provides higher throughput. In Hetnet, optimal resource utilization is required for efficient resource usage. Proper resource allocation in such a network led to higher data flow performance for real-time applications. In view of optimal resource allocation, a resource utilization approach for a reconfigurable cognitive device with spectrum sensing capability is proposed in this paper. The allocation of the data flow rate at device level is proposed for optimization of network fairness in a heterogeneous network. A dynamic approach of rate-inference optimization is proposed to provide fairness in dynamic data traffic conditions. The simulation results validate the improvement in offered quality in comparison to multi-attribute optimization.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 3; 269-277
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic semantic description and search methods for heterogeneous learning resources
Autorzy:
Lai, Xiaocong
Pan, Ying
Jiang, Xueling
Powiązania:
https://bibliotekanauki.pl/articles/2173685.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heterogeneous data
learning resources
semantic description
semantic search
dane niejednorodne
zasoby edukacyjne
opis semantyczny
wyszukiwanie semantyczne
Opis:
Learning resources are massive, heterogeneous, and constantly changing. How to find the required resources quickly and accurately has become a very challenging work in the management and sharing of learning resources. According to the characteristics of learning resources, this paper proposes a progressive learning resource description model, which can describe dynamic heterogeneous resource information on a fine-grained level by using information extraction technology, then a semantic annotation algorithm is defined to calculate the semantic of learning resource and add these semantic to the description model. Moreover, a semantic search method is proposed to find the required resources, which calculate the content with the highest similarity to the user query, and then return the results in descending order of similarity. The simulation results show that the method is feasible and effective.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e139434
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micro-macro model for prediction of local temperature distribution in heterogeneous and two-phase media
Autorzy:
Furmański, P.
Seredyński, M.
Łapka, P.
Banaszek, J.
Powiązania:
https://bibliotekanauki.pl/articles/240316.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heterogeneous media
heat conduction
micro-macro modeling
materiały niejednorodne
przewodnictwo ciepła
mikro modelowanie
makromodelowanie
Opis:
Heat flow in heterogeneous media with complex microstructure follows tortuous path and therefore determination of temperature distribution in them is a challenging task. Two-scales, micro-macro model of heat conduction with phase change in such media was considered in the paper. A relation between temperature distribution on the microscopic level, i.e., on the level of details of microstructure, and the temperature distribution on the macroscopic level, i.e., on the level where the properties were homogenized and treated as effective, was derived. The expansion applied to this relation allowed to obtain its more simplified, approximate form corresponding to separation of micro- and macro-scales. Then the validity of this model was checked by performing calculations for 2D microstructure of a composite made of two constituents. The range of application of the proposed micro-macro model was considered in transient states of heat conduction both for the case when the phase change in the material is present and when it is absent. Variation of the effective thermal conductivity with time was considered and a criterion was found for which application of the considered model is justified.
Źródło:
Archives of Thermodynamics; 2014, 35, 3; 81-103
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling vehicular behaviour using trajectory data under non-lane based heterogeneous traffic conditions
Autorzy:
Gaddam, Hari Krishna
Rao, Ramachandra K.
Powiązania:
https://bibliotekanauki.pl/articles/224361.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-lane discipline
heterogeneous traffic
vehicle trajectories
lateral separation distance
frictional clearance
ruch heterogeniczny
trajektorie pojazdów
odległość boczna
tarcie
Opis:
The present study aims to understand the interaction between different vehicle classes using various vehicle attributes and thereby obtain useful parameters for modelling traffic flow under non-lane based heterogeneous traffic conditions. To achieve this, a separate coordinate system has been developed to extract relevant data from vehicle trajectories. Statistical analysis results show that bi-modal and multi-modal distributions are accurate in representing vehicle lateral placement behaviour. These distributions help in improving the accuracy of microscopic simulation models in predicting vehicle lateral placement on carriageway. Vehicles off-centeredness behaviour with their leaders have significant impact on safe longitudinal headways which results in increasing vehicular density and capacity of roadway. Another interesting finding is that frictional clearance distance between vehicles influence their passing speed. Analysis revealed that the passing speeds of the fast moving vehicles such as cars are greatly affected by the presence of slow moving vehicles. However, slow moving vehicles does not reduce their speeds in the presence of fast moving vehicles. It is also found that gap sizes accepted by different vehicle classes are distributed according to Weibull, lognormal and 3 parameter log logistic distributions. Based on empirical observations, the study proposed a modified lateral separation distance factor and frictional resistance factor to model the non-lane heterogeneous traffic flow at macro level. It is anticipated that the outcomes of this study would help in developing a new methodology for modelling non-lane based heterogeneous traffic.
Źródło:
Archives of Transport; 2019, 52, 4; 95-108
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometric factors influencing entry capacity of roundabouts under heterogeneous traffic conditions
Autorzy:
Zacharia, Arun Baby
Madhavan, Harikrishna
Anjaneyulu, M. V. L. R.
Powiązania:
https://bibliotekanauki.pl/articles/224085.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roundabout
entry capacity
geometry
heterogeneous traffic
traffic conditions
regression
rondo
najazd
geometria ronda
ruch heterogeniczny
warunki drogowe
Opis:
Roundabout entry capacity is influenced by geometric features of the roundabout, traffic flow characteristics, vehicle are checked. In comparison with the existing empirical models such as the LR942 regression model and German empirical model, the proposed regression model produced better estimates and much lower RMSE values. Approach width is found to have the highest impact on entry capacity. The entry capacity is found to be negatively influenced by entry angle. Circulating flow is considered in terms of per metre width against the usual convention. This modification incorporates the effect of circulatory roadway width also into consideration. The circulatory roadway width has a diverse effect on entry capacity at different levels of circulating flow. Modification of inscribed circle diameter and circulatory roadway width is suggested as a potential solution for improving entry capacity. Sensitivity analysis is carried out to quantify the effect of variation of entry angle, circulatory roadway width, inscribed circle diameter and approach width on entry capacity based on the non-linear model. The sensitivity plots can be used to make subtle geometric modifications to improve capacity at congested roundabouts.
Źródło:
Archives of Transport; 2019, 49, 1; 87-101
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Coverage and Area Spectral Efficiency under Various Design Parameters of Heterogeneous Cellular Network
Autorzy:
Abbasi, Anum
Shaikh, M. Mujtaba
Dahri, Safia
Soomro, Sarfraz Ahmed
Panhwar, Fozia Aijaz
Powiązania:
https://bibliotekanauki.pl/articles/2055224.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heterogeneous network
coverage
area spectral efficiency
5G
ultra-dense network
Opis:
As day by day the population is increasing, the use of mobile phones and different applications is increasing which requires high data rate for transmission. Homogeneous cellular network cannot fulfill the demand of mobile users, so creating a heterogeneous cellular network (HCN) is a better choice for higher coverage and capacity to fulfil the increasing demand of upcoming 5G and ultra-dense cellular networks. In this research, the impact of antenna heights and gains under varying pico to macro base stations density ratio from 2G to 5G and beyond on two-tier heterogeneous cellular network has been analyzed for obtaining optimum results of coverage and area spectral efficiency. Furthermore, how the association of UEs affects the coverage and ASE while changing the BSs antenna heights and gains has been explored for the two-tier HCN network model. The simulation results show that by considering the maximum macro BS antenna height, pico BS antenna height equal to user equipment (UE) antenna height and unity gains for both macro and pico tiers, the optimum coverage and area spectral efficiency (ASE) for a two-tier fully loaded heterogeneous cellular network can be obtained.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 4; 639--645
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
M/G→ /n/0 Erlang queueing system with heterogeneous servers and non-homogeneous customers
Autorzy:
Ziółkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/199840.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-server queueing systems
queueing systems with non-homogeneous customers
queueing systems with heterogeneous servers
total volume distribution
Laplace–Stieltjes transform
system kolejkowania
transformata Laplace'a-Stieltjesa
dystrybucja
Opis:
In the present paper, we investigate a multi-server queueing system with heterogeneous servers, unlimited memory space, and non-homogeneous customers. The arriving customers appear according to a stationary Poisson process. Service time distribution functions may be different for every server. Customers are additionally characterized by some random volume. On every server, the service time of the customer depends on their volume. The number of customers distribution function is obtained in the classical model of the system. In the model with non-homogeneous customers, the stationary total volume distribution function is determined in the term of Laplace–Stieltjes transform. The stationary first and second moments of a total customers volume are calculated. An analysis of some special cases of the model and some numerical examples are also included.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 59-66
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Log-Normal Distribution of Heterogeneous Nucleation Substrate in the AZ91/SiCp Composite
Autorzy:
Gracz, B.
Żak, P. L.
Szucki, M.
Lelito, J.
Powiązania:
https://bibliotekanauki.pl/articles/379492.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AZ91/SiCp composite
heterogeneous nucleation
log-normal distribution
substrate distribution
kompozyt AZ91/SiCp
zarodkowanie heterogeniczne
rozkład log-normalny
rozkład podłoża
Opis:
The aim in this work is to develop a log-normal distribution of heterogeneous nucleation substrates for the composite based on AZ91 alloy reinforced by SiC particles. The computational algorithm allowing the restore of the nucleation substrates distribution was used. The experiment was performed for the AZ91 alloy containing 4%wt. of SiC particles. Obtained from experiment, the grains density of magnesium primary phase and supercooling were used to algorithm as input data.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3 spec.; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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