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Informacje o czasopiśmie
Format
Czasopismo
eISSN
1178-5608
Pierwsze wydanie
01 Jan 2008
Częstotliwość wydawania
1 raz w roku
Języki
Angielski

Wyszukiwanie

Tom 3 (2010): Zeszyt 2 (January 2010)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
1178-5608
Pierwsze wydanie
01 Jan 2008
Częstotliwość wydawania
1 raz w roku
Języki
Angielski

Wyszukiwanie

10 Artykułów
access type Otwarty dostęp

A New Method to Assess Perceived Well-Being among Elderly People – a Follow-Up Study

Data publikacji: 12 Dec 2017
Zakres stron: 130 - 145

Abstrakt

Abstract

This is a follow-up study to a previous experiment that evaluated the feasibility of a simple monitoring device, Con-Dis, in assessing perceived well-being (PWB) among elderly people. Additionally, in the present study Con-Dis was used at the same time as blood pressure and heart rate monitors and pedometers to see the possible correlation between PWB, blood pressure, heart rate, and time spent on outdoor activity. The Con-Dis device proved technically functional, feasible, and informative throughout the four-week follow-up test period among elderly test subjects. In addition, PWB (measured by Con-Dis) appeared to correlate with mood, QoL, and time spent on outdoor activity.

Słowa kluczowe

  • Monitoring system
  • perceived well-being
  • electronic device
  • care home for the elderly
  • Con-Dis
access type Otwarty dostęp

Robust Fusion Algorithms for Linear Dynamic System with Uncertainty

Data publikacji: 12 Dec 2017
Zakres stron: 146 - 155

Abstrakt

Abstract

In this paper, two robust fusion algorithms for a linear system with observation uncertainty are proposed. The first algorithm is based on the classical median function and the second one uses relative distances between local estimates and their median value. In the view of estimation accuracy, the proposed fusion algorithms can be robust against uncertainty measurements since median can avoid extremely big or small values. This fact is verified from comparative analysis using numerical examples.

access type Otwarty dostęp

Experimental Study on Vibration Control of Shape Memory Alloy Actuated Flexible Beam

Data publikacji: 12 Dec 2017
Zakres stron: 156 - 175

Abstrakt

Abstract

This paper describes the development of an experimental platform which analyzes and controls the vibration of a Shape Memory Alloy (SMA) actuated and piezo sensed flexible beam. The vibration is controlled using the interactive force of a pair of almost identical SMA wires connected in an antagonistic manner, arranged in parallel to and on both sides of the cantilever beam structure. Data acquisition and control are implemented using a PCI data acquisition card and LabVIEW. Standard P, PI, ON-OFF controllers have been used to control the first mode of vibration of the flexible beam. Experimental results are used to demonstrate the effectiveness of the controllers designed and usefulness of the proposed test platform by exciting the structure at resonance.

Słowa kluczowe

  • Smart structure
  • Shape Memory Alloy
  • Vibration Control
  • LabVIEW
  • P, PI and ON-OFF controller
access type Otwarty dostęp

Micro-Generator Design for Smart Grid System (Comparative Study)

Data publikacji: 12 Dec 2017
Zakres stron: 176 - 216

Abstrakt

Abstract

High Speed PM Generators driven by micro-turbines are widely used in Smart Grid System. So, this paper proposes comparative study among six classical, optimized and genetic analytical design cases for 400 kW output power at tip speed 200 m/s. These six design trials of High Speed Permanent Magnet Synchronous Generators (HSPMSGs) are: Classical Sizing; Unconstrained optimization for total losses and its minimization; Constrained optimized total mass with bounded constraints are introduced in the problem formulation. Then a genetic algorithm is formulated for obtaining maximum efficiency and minimizing machine size. In the second genetic problem formulation, we attempt to obtain minimum mass, the machine sizing that is constrained by the non-linear constraint function of machine losses. Finally, an optimum torque per ampere genetic sizing is predicted. All results are simulated with MATLAB, Optimization Toolbox and its Genetic Algorithm. Finally, six design examples comparisons are introduced with study of machines waveforms, THD and rotor losses.

Słowa kluczowe

  • High Speed
  • Micro-Turbines
  • Optimization
  • PM Generators
  • Smart Grid
  • MATLAB
access type Otwarty dostęp

Simulation Studies on a New Intelligent Scheme For Relative Humidity And Temperature Measurement Using Thermistors in 555 Timer Circuit

Data publikacji: 12 Dec 2017
Zakres stron: 217 - 229

Abstrakt

Abstract

This paper presents a novel and cheap electronic version of wet and dry temperature hygrometer The instrument is centered around a 555 timer, operated in astable multivibrator mode. Two thermistors with negative temperature coefficients (NTC) serve as the two timing resistors of the multivibrator. These thermistors are used to sense the dry and wet temperatures. The durations of the ‘HIGH’ and ‘LOW’ levels of the multivibrator output are detected and these values are used to predict the relative humidity and ambient temperature by an appropriately trained Artificial Neural Network (ANN). The performance of the arrangement has been evaluated by numerical simulation studies using thermistor data from manufacturer’s table. Significantly good results have been obtained.

Słowa kluczowe

  • ANN Linearizer
  • 555 timer
  • Relative Humidity
  • Thermistor
access type Otwarty dostęp

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

Data publikacji: 12 Dec 2017
Zakres stron: 230 - 252

Abstrakt

Abstract

1-5 Napthalenedisulphonic acid (NDSA) doped polypyrrole thin films are prepared by chemical oxidation polymerization and applied as modified claddings to optical fibers for organophosphate (dimethyl-methyl phosphonate, DMMP) sensing. DMMP sensing takes place via intensity modulation in multimode fibers due to refractive index modulation in polypyrrole films due to DMMP adsorption. The polypyrrole films are characterized by FTIR and Raman spectroscopy. Ellipsometry and thin film transmission study is conducted to monitor refractive index modulation in polypyrrole thin films upon DMMP exposure. The developed fiber optic sensor shows a sensitivity of 134ppm towards DMMP. Influence of sensing element length, sensing element diameter and input light intensity on the sensor response is investigated. The selectivity, environmental and thermal stability issues are also addressed.

Słowa kluczowe

  • Conducting Polymer
  • Optical fiber Sensor
  • Polypyrrole
  • DMMP
  • Nerve agent
  • Evanacent wave sensing
  • chemo-chromic transducer
access type Otwarty dostęp

FPGA-Based Implementation of Real Time Optical Flow Algorithm and Its Applications for Digital Image Stabilization

Data publikacji: 12 Dec 2017
Zakres stron: 253 - 272

Abstrakt

Abstract

An efficient simplification procedure of the optical flow (OF) algorithm as well as its hardware implementation using the field programmable gate array (FPGA) technology is presented. The modified algorithm is based on block matching of subsets of successive frames, and exploits onedimensional representation of subsets as well as the adaptive adjustments of their sizes. Also, an l1- norm-based correlation function requiring no multiplication/division operations is used. As a result, it was possible to reduce the computational complexity of the algorithm without compromising the processing accuracy. Both the accuracy and the limitations resulting from the introduced simplifications have been verified based on several examples of both synthetic and real movie samples. The presented algorithm has been implemented using VirtexII-1000 FPGA to realize a digital stabilization system for the CMOS camera images. Experimental results fully confirm the efficiency of the presented algorithm when working with limited computational resources. This demonstrates the possibility of using our algorithm in the autonomous navigation and other battery-powered systems.

Słowa kluczowe

  • Optical flow
  • correlation algorithm
  • digital image stabilization
  • FPGA
access type Otwarty dostęp

The Effect of Catalytic Metal Contact on Methane Sensing Performance of Nanoporous ZnO -Si Heterojunction

Data publikacji: 12 Dec 2017
Zakres stron: 273 - 291

Abstrakt

Abstract

A sol-gel derived ZnO-p-Si heterojunction structure were fabricated and investigated as a potential methane sensor. Three configurations with different contacts (Pd-Ag contact both on ZnO and Si / Pd-Ag on ZnO side and Au on Si / and Au on both sides of the junction) were fabricated in order to study the impact of the catalytic contact on the methane sensing properties. Structural characterization with high resolution FESEM and EDX study revealed the synthesis of highly crystalline ZnO thin film with particle size ~40nm. The catalytic contact metal used was also of nanoporous nature as was revealed from FESEM were as the noncatalyic metal showed flake like texture. The heterojunctions were investigated at different operating temperatures (50°C-300°C) and at different operating voltages (1-5V) for varying concentrations of methane (0.1%, 0.5% and 1.0%). It was observed that the device with Pd-Ag (70%) contacts on both sides offered shorter response time (~28sec) and much higher response magnitude (~63%) compared to the sensor with Au contact both sides (response time ~47 sec and response magnitude ~ 19%). It is further revealed that the sensor performance with catalytic contact only to ZnO (and Au to Si) is almost the same as that of sensor having catalytic contact on both sides, emphasizing the fact that using catalytic contact to the sensing layer only modulates the sensor characteristics. The diode parameters like ideality factor, saturation current and the change in barrier height (upon exposure to methane) were also calculated for getting the insight of the sensing mechanism and were found to be in well agreement with the experimental results.

access type Otwarty dostęp

A High Resolution of Human Breath Gas Sensor and the Analysis of Hyperventilation for Rescue Robotics in Disaster Zones (IRIS2010)

Data publikacji: 12 Dec 2017
Zakres stron: 292 - 303

Abstrakt

Abstract

This paper presents a new type of ultrasonic gas molecule concentration sensor for rescue robotics and the performance of developed sensor is investigated by applying as human breath gas measurement sensor. This devise can measure the change of the gas concentration with a sampling rate of 400 kHz. Ideal gas experiment results show that the proposed sensor could detect the difference between 5% CO2 and pure air over 50 dB S/N and could discriminate humidified air and pure air with 55 dB S/N. Another important result is that our proposed respiratory sensor could detect the “dead space” distributed from lungs to mouth, which could not be detected by previously proposed commercial use gas concentration sensors. Therefore, this sensor can detect a human-specific smallamount of molecular gas change of the survivors in a disaster zones. In addition, we measured the hyperventilation state, in which it is assumed that the survivor is in critical conditions.

Słowa kluczowe

  • Human breath sensor
  • high sampling speed
  • rescue robotics
  • hyper-ventilation
access type Otwarty dostęp

Sliding Mode Based Fuzzy Control for Positioning of Optical Pickup Head

Data publikacji: 12 Dec 2017
Zakres stron: 304 - 321

Abstrakt

Abstract

A laser diode package is mounted on an optical pickup head actuator. The laser diode package is used to sense the displacement of a moving target by self-mixing interference signals. A sliding mode based fuzzy control method is developed to achieve fast response of the optical pickup head actuator, which is driven in a focusing direction. Simulation results show the proposed method performs better than sliding-mode control. Experimental results further show that the proposed control method outperforms sliding-mode control.

Słowa kluczowe

  • Sliding-mode control
  • fuzzy control
  • optical storage device
  • feedback lasers
  • photodiodes
10 Artykułów
access type Otwarty dostęp

A New Method to Assess Perceived Well-Being among Elderly People – a Follow-Up Study

Data publikacji: 12 Dec 2017
Zakres stron: 130 - 145

Abstrakt

Abstract

This is a follow-up study to a previous experiment that evaluated the feasibility of a simple monitoring device, Con-Dis, in assessing perceived well-being (PWB) among elderly people. Additionally, in the present study Con-Dis was used at the same time as blood pressure and heart rate monitors and pedometers to see the possible correlation between PWB, blood pressure, heart rate, and time spent on outdoor activity. The Con-Dis device proved technically functional, feasible, and informative throughout the four-week follow-up test period among elderly test subjects. In addition, PWB (measured by Con-Dis) appeared to correlate with mood, QoL, and time spent on outdoor activity.

Słowa kluczowe

  • Monitoring system
  • perceived well-being
  • electronic device
  • care home for the elderly
  • Con-Dis
access type Otwarty dostęp

Robust Fusion Algorithms for Linear Dynamic System with Uncertainty

Data publikacji: 12 Dec 2017
Zakres stron: 146 - 155

Abstrakt

Abstract

In this paper, two robust fusion algorithms for a linear system with observation uncertainty are proposed. The first algorithm is based on the classical median function and the second one uses relative distances between local estimates and their median value. In the view of estimation accuracy, the proposed fusion algorithms can be robust against uncertainty measurements since median can avoid extremely big or small values. This fact is verified from comparative analysis using numerical examples.

access type Otwarty dostęp

Experimental Study on Vibration Control of Shape Memory Alloy Actuated Flexible Beam

Data publikacji: 12 Dec 2017
Zakres stron: 156 - 175

Abstrakt

Abstract

This paper describes the development of an experimental platform which analyzes and controls the vibration of a Shape Memory Alloy (SMA) actuated and piezo sensed flexible beam. The vibration is controlled using the interactive force of a pair of almost identical SMA wires connected in an antagonistic manner, arranged in parallel to and on both sides of the cantilever beam structure. Data acquisition and control are implemented using a PCI data acquisition card and LabVIEW. Standard P, PI, ON-OFF controllers have been used to control the first mode of vibration of the flexible beam. Experimental results are used to demonstrate the effectiveness of the controllers designed and usefulness of the proposed test platform by exciting the structure at resonance.

Słowa kluczowe

  • Smart structure
  • Shape Memory Alloy
  • Vibration Control
  • LabVIEW
  • P, PI and ON-OFF controller
access type Otwarty dostęp

Micro-Generator Design for Smart Grid System (Comparative Study)

Data publikacji: 12 Dec 2017
Zakres stron: 176 - 216

Abstrakt

Abstract

High Speed PM Generators driven by micro-turbines are widely used in Smart Grid System. So, this paper proposes comparative study among six classical, optimized and genetic analytical design cases for 400 kW output power at tip speed 200 m/s. These six design trials of High Speed Permanent Magnet Synchronous Generators (HSPMSGs) are: Classical Sizing; Unconstrained optimization for total losses and its minimization; Constrained optimized total mass with bounded constraints are introduced in the problem formulation. Then a genetic algorithm is formulated for obtaining maximum efficiency and minimizing machine size. In the second genetic problem formulation, we attempt to obtain minimum mass, the machine sizing that is constrained by the non-linear constraint function of machine losses. Finally, an optimum torque per ampere genetic sizing is predicted. All results are simulated with MATLAB, Optimization Toolbox and its Genetic Algorithm. Finally, six design examples comparisons are introduced with study of machines waveforms, THD and rotor losses.

Słowa kluczowe

  • High Speed
  • Micro-Turbines
  • Optimization
  • PM Generators
  • Smart Grid
  • MATLAB
access type Otwarty dostęp

Simulation Studies on a New Intelligent Scheme For Relative Humidity And Temperature Measurement Using Thermistors in 555 Timer Circuit

Data publikacji: 12 Dec 2017
Zakres stron: 217 - 229

Abstrakt

Abstract

This paper presents a novel and cheap electronic version of wet and dry temperature hygrometer The instrument is centered around a 555 timer, operated in astable multivibrator mode. Two thermistors with negative temperature coefficients (NTC) serve as the two timing resistors of the multivibrator. These thermistors are used to sense the dry and wet temperatures. The durations of the ‘HIGH’ and ‘LOW’ levels of the multivibrator output are detected and these values are used to predict the relative humidity and ambient temperature by an appropriately trained Artificial Neural Network (ANN). The performance of the arrangement has been evaluated by numerical simulation studies using thermistor data from manufacturer’s table. Significantly good results have been obtained.

Słowa kluczowe

  • ANN Linearizer
  • 555 timer
  • Relative Humidity
  • Thermistor
access type Otwarty dostęp

1-5 Napthalenedisulphonic Acid Doped Polypyrrole thin films as Coatings to Optical Fibers for Organophosphate Sensing

Data publikacji: 12 Dec 2017
Zakres stron: 230 - 252

Abstrakt

Abstract

1-5 Napthalenedisulphonic acid (NDSA) doped polypyrrole thin films are prepared by chemical oxidation polymerization and applied as modified claddings to optical fibers for organophosphate (dimethyl-methyl phosphonate, DMMP) sensing. DMMP sensing takes place via intensity modulation in multimode fibers due to refractive index modulation in polypyrrole films due to DMMP adsorption. The polypyrrole films are characterized by FTIR and Raman spectroscopy. Ellipsometry and thin film transmission study is conducted to monitor refractive index modulation in polypyrrole thin films upon DMMP exposure. The developed fiber optic sensor shows a sensitivity of 134ppm towards DMMP. Influence of sensing element length, sensing element diameter and input light intensity on the sensor response is investigated. The selectivity, environmental and thermal stability issues are also addressed.

Słowa kluczowe

  • Conducting Polymer
  • Optical fiber Sensor
  • Polypyrrole
  • DMMP
  • Nerve agent
  • Evanacent wave sensing
  • chemo-chromic transducer
access type Otwarty dostęp

FPGA-Based Implementation of Real Time Optical Flow Algorithm and Its Applications for Digital Image Stabilization

Data publikacji: 12 Dec 2017
Zakres stron: 253 - 272

Abstrakt

Abstract

An efficient simplification procedure of the optical flow (OF) algorithm as well as its hardware implementation using the field programmable gate array (FPGA) technology is presented. The modified algorithm is based on block matching of subsets of successive frames, and exploits onedimensional representation of subsets as well as the adaptive adjustments of their sizes. Also, an l1- norm-based correlation function requiring no multiplication/division operations is used. As a result, it was possible to reduce the computational complexity of the algorithm without compromising the processing accuracy. Both the accuracy and the limitations resulting from the introduced simplifications have been verified based on several examples of both synthetic and real movie samples. The presented algorithm has been implemented using VirtexII-1000 FPGA to realize a digital stabilization system for the CMOS camera images. Experimental results fully confirm the efficiency of the presented algorithm when working with limited computational resources. This demonstrates the possibility of using our algorithm in the autonomous navigation and other battery-powered systems.

Słowa kluczowe

  • Optical flow
  • correlation algorithm
  • digital image stabilization
  • FPGA
access type Otwarty dostęp

The Effect of Catalytic Metal Contact on Methane Sensing Performance of Nanoporous ZnO -Si Heterojunction

Data publikacji: 12 Dec 2017
Zakres stron: 273 - 291

Abstrakt

Abstract

A sol-gel derived ZnO-p-Si heterojunction structure were fabricated and investigated as a potential methane sensor. Three configurations with different contacts (Pd-Ag contact both on ZnO and Si / Pd-Ag on ZnO side and Au on Si / and Au on both sides of the junction) were fabricated in order to study the impact of the catalytic contact on the methane sensing properties. Structural characterization with high resolution FESEM and EDX study revealed the synthesis of highly crystalline ZnO thin film with particle size ~40nm. The catalytic contact metal used was also of nanoporous nature as was revealed from FESEM were as the noncatalyic metal showed flake like texture. The heterojunctions were investigated at different operating temperatures (50°C-300°C) and at different operating voltages (1-5V) for varying concentrations of methane (0.1%, 0.5% and 1.0%). It was observed that the device with Pd-Ag (70%) contacts on both sides offered shorter response time (~28sec) and much higher response magnitude (~63%) compared to the sensor with Au contact both sides (response time ~47 sec and response magnitude ~ 19%). It is further revealed that the sensor performance with catalytic contact only to ZnO (and Au to Si) is almost the same as that of sensor having catalytic contact on both sides, emphasizing the fact that using catalytic contact to the sensing layer only modulates the sensor characteristics. The diode parameters like ideality factor, saturation current and the change in barrier height (upon exposure to methane) were also calculated for getting the insight of the sensing mechanism and were found to be in well agreement with the experimental results.

access type Otwarty dostęp

A High Resolution of Human Breath Gas Sensor and the Analysis of Hyperventilation for Rescue Robotics in Disaster Zones (IRIS2010)

Data publikacji: 12 Dec 2017
Zakres stron: 292 - 303

Abstrakt

Abstract

This paper presents a new type of ultrasonic gas molecule concentration sensor for rescue robotics and the performance of developed sensor is investigated by applying as human breath gas measurement sensor. This devise can measure the change of the gas concentration with a sampling rate of 400 kHz. Ideal gas experiment results show that the proposed sensor could detect the difference between 5% CO2 and pure air over 50 dB S/N and could discriminate humidified air and pure air with 55 dB S/N. Another important result is that our proposed respiratory sensor could detect the “dead space” distributed from lungs to mouth, which could not be detected by previously proposed commercial use gas concentration sensors. Therefore, this sensor can detect a human-specific smallamount of molecular gas change of the survivors in a disaster zones. In addition, we measured the hyperventilation state, in which it is assumed that the survivor is in critical conditions.

Słowa kluczowe

  • Human breath sensor
  • high sampling speed
  • rescue robotics
  • hyper-ventilation
access type Otwarty dostęp

Sliding Mode Based Fuzzy Control for Positioning of Optical Pickup Head

Data publikacji: 12 Dec 2017
Zakres stron: 304 - 321

Abstrakt

Abstract

A laser diode package is mounted on an optical pickup head actuator. The laser diode package is used to sense the displacement of a moving target by self-mixing interference signals. A sliding mode based fuzzy control method is developed to achieve fast response of the optical pickup head actuator, which is driven in a focusing direction. Simulation results show the proposed method performs better than sliding-mode control. Experimental results further show that the proposed control method outperforms sliding-mode control.

Słowa kluczowe

  • Sliding-mode control
  • fuzzy control
  • optical storage device
  • feedback lasers
  • photodiodes

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