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1
Content available Emotion monitoring – verification of physiological characteristics measurement procedures
100%
Landowska A.
Metrology and Measurement Systems
|
2014
|
tom Vol. 21, nr 4
719--732
EN
This paper concerns measurement procedures on an emotion monitoring stand designed for tracking human emotions in the Human-Computer Interaction with physiological characteristics. The paper addresses the key problem of physiological measurements being disturbed by a motion typical for human-computer interaction such as keyboard typing or mouse movements. An original experiment is described, that aimed at practical evaluation of measurement procedures performed at the emotion monitoring stand constructed at GUT. Different locations of sensors were considered and evaluated for suitability and measurement precision in the Human- Computer Interaction monitoring. Alternative locations (ear lobes and forearms) for skin conductance, blood volume pulse and temperature sensors were proposed and verified. Alternative locations proved correlation with traditional locations as well as lower sensitiveness to movements like typing or mouse moving, therefore they can make a better solution for monitoring the Human-Computer Interaction.
2
Content available remote Configuring a sensor network for fault detection in distributed parameter systems
86%
Patan M. , Uciński D.
International Journal of Applied Mathematics and Computer Science
|
2008
|
tom 18
|
nr 4
513-524
EN
The problem of fault detection in distributed parameter systems (DPSs) is formulated as that of maximizing the power of a parametric hypothesis test which checks whether or not system parameters have nominal values. A computational scheme is provided for the design of a network of observation locations in a spatial domain that are supposed to be used while detecting changes in the underlying parameters of a distributed parameter system. The setting considered relates to a situation where from among a finite set of potential sensor locations only a subset can be selected because of the cost constraints. As a suitable performance measure, the Ds-optimality criterion defined on the Fisher information matrix for the estimated parameters is applied. Then, the solution of a resulting combinatorial problem is determined based on the branch-and-bound method. As its essential part, a relaxed problem is discussed in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gauged sites. The concavity and differentiability properties of the criterion are established and a gradient projection algorithm is proposed to perform the search for the optimal solution. The delineated approach is illustrated by a numerical example on a sensor network design for a two-dimensional convective diffusion process.
3
Content available Wykorzystanie analiz przestrzennych w wyznaczaniu położenia anten GPS stacji referencyjnej w Dziwnowie
86%
Łubczonek J.
Biuletyn Wojskowej Akademii Technicznej
|
2011
|
tom Vol. 60, nr 3
247-260
PL
Obecnie do wyboru odpowiedniej lokalizacji różnych sensorów można stosować przestrzenne analizy widoczności z wykorzystaniem Numerycznego Modelu Pokrycia Terenu. Standardowo wynikiem takiej lokalizacji jest klasyfikacja NMPT na obszary niewidoczne i widoczne. Znalezienie optymalnej lokalizacji wymaga przeprowadzenia wielu prób, które w zasadzie w sposób przybliżony, a nawet przypadkowy, wyznaczają hipotetycznie pozycję optymalną. W pracy zastosowano metodę, która jest rozwinięciem analizy widoczności, polegającej na wskazaniu obszaru lokalizacji spełniającego ustalone kryteria widoczności na obszarze opracowania. Wynikiem takiej analizy jest wyznaczenie dedykowanego obszaru lokalizacji anten, dzięki czemu można precyzyjniej określić ich docelowe położenie. Badania przeprowadzono dla stacji referencyjnej DGPS w Dziwnowie.
EN
Spatial configuration of DGPS permanent reference station elements has an effect on a performance of the entire system. The arrangement of station elements, such as a broadcast antenna and reference masts, requires an allowance and a further linking together with a number of technical, operational and terrain factors. Some technical and operational factors as a rule are determined by the equipment manufacturer; however, terrain factors are conditioned by terrain character of the future reference station site. The terrain character is a composition of its surface shape and all geographical features situated within the reference station surroundings. These factors often can cause certain difficulties during recommended elements' arrangement of the planned reference station. This elaboration presents applications of visibility analysis in planning spatial location of the reference stations GPS antennas. Visibility, or viewshed, analysis is usually available in various computer programs of Geographic Information System environment. It can be performed from any point situated in the three-dimensional space of an elaboration range. In the case of such elements as permanent GPS antennas, application of visibility analyses solves the problem of their location with the allowance of the surroundings and geographical features, which can cause limitation of visibility of satellites and occurrence of multipath. Basically, by performing this kind of analyses, the three-dimensional position of GPS antennas can be determined, which meets such requirements as recommended horizon visibility. In this paper, the extended method based on viewshed analysis is presented. By using this method, the model of obturation factor can be created, which presents a continuous spatial distribution of its values within a possible area of the antennas placement. This feature allows for more precise area determination of the possible GPS antennas location. Additionally, by applying further analysis based on a raster arithmetic, the antenna height over ground can be assessed, which is also useful during making decision about future configuration of the reference station. The study was conducted in DGPS reference station in Dziwnów mainly used for marine navigation. The analysis results show the present state of the GPS antennas location and a possibility of its correction for a better performance of the whole reference station.
4
Content available remote Optymalne, brzegowe rozmieszczenie czujników pomiarowych dla układu o parametrach rozłożonych
72%
Szewczyk D.
Przegląd Elektrotechniczny
|
2010
|
tom R. 86, nr 3
256-261
PL
W pracy przedstawiony został problem optymalnego rozmieszczenia czujników pomiarowych dla liniowego układu o parametrach rozłożonych opisanego równaniem różniczkowym cząstkowym typu parabolicznego, w przypadku ograniczenia możliwości dokonywania pomiarów do brzegu obszaru określoności tego układu.
EN
The boundary optimum experimental design problem for linear distributed parameter systems described by linear parabolic equations is considered. The approach, based on appropriate optimization techniques, shows how to construct and determine the initial state.
5
Content available Planowanie eksperymentu dla wyznaczania warunku początkowego układu o parametrach rozłożonych
72%
Szewczyk D.
Pomiary Automatyka Kontrola
|
2007
|
tom R. 53, nr 10
7-11
PL
W pracy przedstawiony został problem optymalnego rozmieszczenia czujników pomiarowych dla liniowego układu o parametrach rozłożonych opisanego równaniem różniczkowym cząstkowym typu parabolicznego z mieszanymi warunkami brzegowymi. Przedstawiony jest również sposób wyznaczenia przybliżenia funkcyjnego warunku początkowego.
EN
The optimum experimental design problem for linear distributed parameter systems described by linear parabolic equations is considered. The approach, based on appropriate optimization techniques, shows how to construct and determine the initial state.
6
Diagnostyka procesów z czasoprzestrzenną dynamiką z zastosowaniem przetwarzania równoległego
72%
Baranowski P. , Kuczewski B.
Pomiary Automatyka Kontrola
|
2005
|
tom R. 51, nr 9 bis
74--76
PL
W pracy formułuje się problem określania optymalnych położeń czujników pomiarowych w sposób zapewniający maksymalną moc testu weryfikującego hipotezę dotyczącą prawdziwości nominalnego modelu procesu charakteryzującego bezawaryjny stan procesu z czasoprzestrzenną dynamiką, zdefiniowanego w zadanym dwuwymiarowym obszarze przestrzennym. Optymalne położenia czujników wyznacza się w oparciu o kryterium T-optymalności, należące do klasy kryteriów maksyminowych. Rozwiązań numerycznych poszukuje się w oparciu o implementację algorytmu programowania półnieskończonego w klastrze obliczeniowym obejmującym osiem 64-bitowych procesorów Intel Itanium.
EN
The paper formulates the problem of optimal sensor location for maximizing the power of the test for the hypothesis that the nominal fault-free model of a given process is true. The process is assumed to be a distributed parameter system, i.e., it is described by a system of partial differential equations. Optimal sensor locations arc determined based on the T-optimality criterion belonging to the family of maximin criteria which usually involve a high computational load. Numerical solutions are efficiently sought using an implementation of a semi-infinite programming algorithm in a cluster including eight 64-bit Intel Itanium processors.
7
Content available remote Optimal Selection of Measurement Locations for Parameter Estimation in Distributed Processes
72%
Uciński D.
International Journal of Applied Mathematics and Computer Science
|
2000
|
tom Vol. 10, no 2
357-379
EN
The problem of locating pointwise sensor measurements so as to optimally estimate unknown parameters in a class of distributed systems is studied. Based on a scalar measure of performance defined on the corresponding Fisher information matrix, two approaches are developed for this problem: introduction of continuous designs, which allows for adaptation of well-known sequential algorithms of classical optimum experimental design, and application of standard non-linear programming techniques. In each case, particular algorithms are delineated and analysis of the appropriate sensor placements is made. The relative advantages and shortcomings of both the approaches are discussed and demonstrated by applying them to a two-dimensional diffusion process.
8
Content available remote Configuring a sensor network for fault detection in distributed parameter systems
58%
Patan M. , Uciński D.
International Journal of Applied Mathematics and Computer Science
|
2008
|
tom Vol. 18, no 4
513-524
EN
The problem of fault detection in distributed parameter systems (DPSs) is formulated as that of maximizing the power of a parametric hypothesis test which checks whether or not system parameters have nominal values. A computational scheme is provided for the design of a network of observation locations in a spatial domain that are supposed to be used while detecting changes in the underlying parameters of a distributed parameter system. The setting considered relates to a situation where from among a finite set of potential sensor locations only a subset can be selected because of the cost constraints. As a suitable performance measure, the Ds-optimality criterion defined on the Fisher information matrix for the estimated parameters is applied. Then, the solution of a resulting combinatorial problem is determined based on the branch-and-bound method. As its essential part, a relaxed problem is discussed in which the sensor locations are given a priori and the aim is to determine the associated weights, which quantify the contributions of individual gauged sites. The concavity and differentiability properties of the criterion are established and a gradient projection algorithm is proposed to perform the search for the optimal solution. The delineated approach is illustrated by a numerical example on a sensor network design for a two-dimensional convective diffusion process.
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