Zeszyty czasopisma

Tom 15 (2022): Zeszyt 1 (January 2022)

Tom 14 (2021): Zeszyt 1 (January 2021)

Tom 13 (2020): Zeszyt 1 (January 2020)

Tom 12 (2019): Zeszyt 1 (January 2019)

Tom 11 (2018): Zeszyt 1 (January 2018)

Tom 10 (2017): Zeszyt 5 (January 2017)

Tom 10 (2017): Zeszyt 4 (January 2017)

Tom 10 (2017): Zeszyt 3 (January 2017)

Tom 10 (2017): Zeszyt 2 (January 2017)

Tom 10 (2017): Zeszyt 1 (January 2017)

Tom 9 (2016): Zeszyt 4 (January 2016)

Tom 9 (2016): Zeszyt 3 (January 2016)

Tom 9 (2016): Zeszyt 2 (January 2016)

Tom 9 (2016): Zeszyt 1 (January 2016)

Tom 8 (2015): Zeszyt 4 (January 2015)

Tom 8 (2015): Zeszyt 3 (January 2015)

Tom 8 (2015): Zeszyt 2 (January 2015)

Tom 8 (2015): Zeszyt 1 (January 2015)

Tom 7 (2014): Zeszyt 5 (January 2014)

Tom 7 (2014): Zeszyt 4 (January 2014)

Tom 7 (2022): Zeszyt 3 (January 2022)

Tom 7 (2022): Zeszyt 2 (January 2022)

Tom 7 (2014): Zeszyt 1 (January 2014)

Tom 6 (2013): Zeszyt 5 (January 2013)

Tom 6 (2013): Zeszyt 4 (January 2013)

Tom 6 (2013): Zeszyt 3 (January 2013)

Tom 6 (2013): Zeszyt 2 (January 2013)

Tom 6 (2013): Zeszyt 1 (January 2013)

Tom 5 (2012): Zeszyt 4 (January 2012)

Tom 5 (2012): Zeszyt 3 (January 2012)

Tom 5 (2012): Zeszyt 2 (January 2012)

Tom 5 (2012): Zeszyt 1 (January 2012)

Tom 4 (2011): Zeszyt 4 (January 2011)

Tom 4 (2011): Zeszyt 3 (January 2011)

Tom 4 (2011): Zeszyt 2 (January 2011)

Tom 4 (2011): Zeszyt 1 (January 2011)

Tom 3 (2010): Zeszyt 4 (January 2010)

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

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

Tom 3 (2010): Zeszyt 1 (January 2010)

Tom 2 (2009): Zeszyt 4 (January 2009)

Tom 2 (2009): Zeszyt 3 (January 2009)

Tom 2 (2009): Zeszyt 2 (January 2009)

Tom 2 (2009): Zeszyt 1 (January 2009)

Tom 1 (2008): Zeszyt 4 (January 2008)

Tom 1 (2008): Zeszyt 3 (January 2008)

Tom 1 (2008): Zeszyt 2 (January 2008)

Tom 1 (2008): Zeszyt 1 (January 2008)

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

Wyszukiwanie

Tom 1 (2008): Zeszyt 4 (January 2008)

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

Wyszukiwanie

12 Artykułów
access type Wymagane uwierzytelnienie

The Autonomous Golf Playing Micro Robot: With Global Vision and Fuzzy Logic Controller

Data publikacji: 02 Nov 2017
Zakres stron: 824 - 841

Abstrakt

Abstract

This paper presents design concepts in developing an Autonomous Golf Playing Micro Robot. The robot moves autonomously using 2 DC motors controlled by a remote PC using fuzzy logic system. A servomotor is used for the motion of the putter in hitting the golf ball. A microcontroller is used to process the information sent by the computer through RF communication and drive the robot motors for appropriate motions. The robot plays golf in a defined environment and avoids obstacles. A real golf ball with orange color is use during the game. The system utilizes global camera vision that serves as the eyes of the robot to know its dynamic environment for navigation. The vision system developed detects the position of the robot, golf hole, golf boundaries, and the golf ball within the playing field on real time using color object recognition algorithm. A modified golf tournament between autonomous robot golf player and man operated robot golf player was conducted. Results shows the accuracy and robustness of the autonomous robot developed in performing its tasks.

Słowa kluczowe

  • Edutainment Robots
  • Vision System
  • Image Processing
  • Golf Playing Robot
  • Fuzzy Logic System
access type Otwarty dostęp

Multi-Target, Multi-Sensor Tracking Based on Quality-Of-Information and Formal Bayesian Frameworks

Data publikacji: 02 Nov 2017
Zakres stron: 842 - 857

Abstrakt

Abstract

We consider a multi-target tracking problem that aims to simultaneously determine the number and state of mobile targets in the field. Conventional paradigms tend to report only the existence and state of targets according to centralized detection and data fusion. On the contrary, we investigate a multi-target, multi-sensor scenario in which (a) both the number and the state of the targets are unknown a priori; and (b) the detection with respect to targets is employed in a distributed manner. Toward this end, we exploit random set theory, a statistical tool based on Bayesian framework, for establishing generalized likelihood and Markov density functions to yield an iterative filtering procedure. We conduct a study regarding how the design of distributed detection has impact on the result of system level information fusion. The sources of analyzed data include (a) simulation-based sensor readings through bi-directional sensing/communication; and (b) practical images taken by multiple cameras through uni-directional sensing/communication. The formulation of Bayesian filtering suggests that a design of a tracking system be adaptive to change of detection performance.

Słowa kluczowe

  • Sensor networks
  • multi-target tracking
  • detection
  • random set theory
access type Otwarty dostęp

Advanced Predictive Guidance Navigation for Mobile Robots: A Novel Strategy for Rendezvous in Dynamic Settings

Data publikacji: 02 Nov 2017
Zakres stron: 858 - 890

Abstrakt

Abstract

This paper presents a novel on-line trajectory planning method for the autonomous robotic interception of moving targets in the presence of dynamic obstacles, i.e., position and velocity matching (also referred to as rendezvous). The novelty of the proposed time-optimal interception method is that it directly considers the dynamics of the obstacles as well as the target in its interception maneuver: the velocities and accelerations of the obstacles and the target are predicted in real-time for potential collisions. The method is designed to deal with highly- maneuvering obstacles and targets. The interception maneuver is computed using an Advanced Predictive Guidance Law.

Extensive simulation and experimental analyses, some of which are reported in this paper, have clearly demonstrated the time efficiency of the proposed rendezvous method.

Słowa kluczowe

  • Target interception
  • on-line trajectory planning
  • rendezvous guidance
access type Otwarty dostęp

A Robot Succeeds in 100% Mirror Image Cognition

Data publikacji: 02 Nov 2017
Zakres stron: 891 - 911

Abstrakt

Abstract

Humans are capable of identifying their own image when reflected in a mirror. This mechanism is a mystery that has never been solved. I created a program that achieved such awareness on a robot and conducted three experiments. The first was an experiment on a self robot that imitates its own self-image reflected in a mirror. The second experiment had a robot imitating another robot of the same type which was made to perform the same behavior. The last was an experiment using two robots of the same type and the same functions to imitate each other. In these experiments, the program calculated the coincidence rate of behavior between the self robot and the other robot. I found that compared with the case in which the robot performed a behavior according to its own judgment, the coincidence rate was always higher in the case of the mirror image. At this time, when the target moved according to its own judgment in the second experiment, this can be considered as a part of the self, similar to the use of “human hands and feet.” From this result, the mirror image can be judged to “exist closer to the self than a part of the self” and can in fact be considered a “self.” I thought that the result of these experiments indicated that mirror image cognition of the robot succeeded completely and that this would be the “first example toward explaining physically the mirror image cognition capability of humans.” This paper details logical and physical explanations for achieving the results, and in addition, presents several considerations and prospects derived from the experiment results.

Słowa kluczowe

  • Conscious system
  • robot demonstration
  • mirror test
  • mirror image cognition
  • behavior and cognition
  • self awareness
  • human consciousness
  • cognitivism
access type Otwarty dostęp

Training Data Compression Algorithms and Reliability in Large Wireless Sensor Networks

Data publikacji: 02 Nov 2017
Zakres stron: 912 - 921

Abstrakt

Abstract

With the availability of low-cost sensor nodes there have been many standards developed to integrate and network these nodes to form a reliable network allowing many different types of hardware vendors to coexist. Most of these solutions however have aimed at industry-specific interoperability but not the size of the sensor network and the large amount of data which is collected in course of its lifetime. In this paper we use well studied data compression algorithms which optimize on bringing down the data redundancy which is related to correlated sensor readings and using a probability model to efficiently compress data at the cluster heads. As in the case of sensor networks the data reliability goes down as the network resource depletes and these types of networks lacks any central synchronization making it even more a global problem to compare different reading at the central coordinator. The complexity of calibrating each sensor and using an adaptable measured threshold to correct the reading from sensors is a severe drain in terms of network resources and energy consumption. In this paper we separate the task of comparative global analysis to a central coordinator and use a reference PM ax which is a normalized probability of individual source which reflects the current lifetime reliability of the sensors calculated at the cluster heads which then is compared with the current global reliability index based on all the PMax of cluster heads. As this implementation does not need any synchronization at the local nodes it uses compress once and stamp locally without any threshold such as application specific calibration values (30±C ) and the summarization can be application independent making it more a sensor network reliability index and using it independent of the actual measured values.

access type Otwarty dostęp

Impedance Behaviour of a Microporous PMMA-Film ‘Coated Constant Phase Element’ based Chemical Sensor

Data publikacji: 02 Nov 2017
Zakres stron: 922 - 939

Abstrakt

Abstract

In this work, it has been attempted to characterize a new type of impedance sensor called constant phase element (CPE) sensor; which has microporous PMMA-film coating on the electrode surface. It has been shown that the ‘constant phase angle (CPA)’ behaviour is primarily due to the porous structure of the electrode surface. And the phase angle at the output of the sensor changes with thickness variation of the PMMA coating and ionic property of the medium in which the sensor is dipped in. The sensor has been used for chemical sensing. A phase angle detector circuit gives the output in voltage with the change in the phase angle. The complex impedance plots of the probes has also been discussed. The important fact is that the constructed CPE gives rise to a fractional order system.

Keyword

  • Chemical sensor
  • constant phase element
  • fractional order system
  • phase detector circuit
access type Otwarty dostęp

Sensitivity Improvement of Wireless Pressure Sensor by Incorporating a Saw Reflective Delay Line

Data publikacji: 02 Nov 2017
Zakres stron: 940 - 954

Abstrakt

Abstract

this paper presents a wireless surface acoustic wave (SAW) pressure sensor on 41oYX LiNbO3 for tire pressure monitoring system (TPMS) application, in which a reflective delay line composed of an interdigital transducer (IDT) and several reflectors was used as the sensor element. Using the coupling of modes (COM), the SAW reflective delay line was simulated, and the optimal design parameters were determined. The fabricated 2.4GHz SAW sensor was wirelessly characterized by the network analyzer. Sharp reflection peaks, few spurious signals, and relatively high signal-to-noise (S/N) ratio were observed. High sensitivity of 2.9 deg/kPa and good linearity were observed.

Słowa kluczowe

  • coupling of modes
  • interdigital transducer
  • LiNbO
  • piezoelectric substrate
  • reflective delay line
  • surface acoustic wave
  • wireless pressure sensor
  • temperature compensation
access type Otwarty dostęp

Implementation of linear trace moisture sensor by nano porous thin film moisture sensor and NLAmp

Data publikacji: 02 Nov 2017
Zakres stron: 955 - 969

Abstrakt

Abstract

Almost all type of moisture sensors has a non-linear response. With out linearization it is difficult to apply such a non-linear sensor in electronics circuits, specially in analog electronics. Non linear sensor and transducers characteristic can be linearized using analog electronics or digital electronics. In this paper a method of linearization of such non-linear sensors characteristics using analog electronics is described. Theoretical explanation of the methods and its verification by experiment is stated in this paper. It may possible to linearize any non linear characteristic using this method. We use thin film nano porous trace humidity sensor as a non linear device for the circuit justification. The fabrication process of the sensor is also described in this paper.

Słowa kluczowe

  • Differential slope
  • Amplifier gain control
  • Analog multiplexer
  • Trace moisture sensor
  • PWM
access type Otwarty dostęp

Detection of Transverse Cracks in a Composite Beam Using Combined Features of Lamb Wave and Vibration Techniques in Ann Environment

Data publikacji: 02 Nov 2017
Zakres stron: 970 - 984

Abstrakt

Abstract

The detection, location and sizing of transverse cracks in a composite beam, by combining damage features of Lamb wave and vibration based techniques in artificial neural network (ANN) environment, using numerical finite element model, is discussed. Four damage features, time of flight (TOF) and amplitude ratio, which are Lamb wave based features and first and second natural frequencies, which are vibration based features were used as input to ANN. The output of ANN was crack location and depth. It was demonstrated that through the simultaneous employment of features from the two modalities in an ANN environment, the sizing could be done more effectively.

Słowa kluczowe

  • Lamb wave
  • vibration
  • ANN
  • damage detection
  • crack
  • SHM
  • NDE
access type Otwarty dostęp

Development of an Fpga Based Smart Diagnostic System for Spirometric Data Processing Applications

Data publikacji: 02 Nov 2017
Zakres stron: 985 - 1018

Abstrakt

Abstract

The paper describes the development of an FPGA based fuzzy processing system for pulmonary spirometry applications predicting the approaching obstructive or restrictive pulmonary disorder of the patient before criticality actually occurs. The system employs a smart agent that accepts the Peak Expiratory Flow Rate (PEFR), Forced Expiratory Volume in 1 second (FEV1) and Forced Vital Capacity (FVC) data of patients. In order to speed up the computation process, hybrid parallel data processing architectures with dynamic scheduling mechanism have been employed leading to a speed up of approximately 12 times. The processor implemented on the FPGA can perform fuzzy inferencing at a speed of approximately 5.0 MFLIPS. The whole system is realized on Altera Cyclone EP1K6Q240C8 FPGA chip requiring 5,865 logic blocks. The system has been designed to be inexpensive, portable and user friendly for occupational health care applications in developing countries. Using the system, approaching pulmonary disorder of patients has been predicted with an accuracy of 95.83%.

Słowa kluczowe

  • Spirometry
  • fuzzy processor
  • hybrid parallel data processing architectures
  • smart agent
access type Otwarty dostęp

Design and Optimization of Bulk Micromachined Accelerometer for Space Applications

Data publikacji: 02 Nov 2017
Zakres stron: 1019 - 1030

Abstrakt

Abstract

The accelerometers used for Inertial Navigation in satellite launch vehicles demand excellent performance in terms of sensitivity, noise immunity, linearity, bias and scale factor stability over time and environmental changes. Detailed and in-depth design of the microstructure by computer simulation is required to ensure structural integrity and reliability of the microstructure. The microstructure of the accelerometer consists of a proof mass suspended from the mounting frame by beam springs. Extensive Finite Element simulation of the silicon microstructure has been carried out to obtain application specific optimum design parameters. Based on the deflection, frequency and stress analyses the optimum geometry and dimensions of the accelerometer have been determined. Noise analysis has been carried out, the performance of the accelerometer has been predicted and its compliance to the expected performance is ensured.

Słowa kluczowe

  • Microstructure
  • Microelectromechanical Systems
  • Accelerometer
access type Otwarty dostęp

Dynamic Measurements and Dynamically-Functioning Objects- Time Is to Look at Reality

Data publikacji: 02 Nov 2017
Zakres stron: 1031 - 1039

Abstrakt

Abstract

It is shown that many dynamic tests and measurement technologies base on a changing measurement equation and that internal and external disturbances may change the dynamic functional of the same object and that the reaction of measurement transducer (measurement channel) changes not only in dependence on type of loads. The reasons are given which cause methodical metering errors and make it difficult to build idealized smart sensing and intelligent systems

Słowa kluczowe

  • ‘bad’
  • posed problems
  • dynamic measurements
  • non-linear and chaotic dynamic
  • metering dynamic errors
12 Artykułów
access type Wymagane uwierzytelnienie

The Autonomous Golf Playing Micro Robot: With Global Vision and Fuzzy Logic Controller

Data publikacji: 02 Nov 2017
Zakres stron: 824 - 841

Abstrakt

Abstract

This paper presents design concepts in developing an Autonomous Golf Playing Micro Robot. The robot moves autonomously using 2 DC motors controlled by a remote PC using fuzzy logic system. A servomotor is used for the motion of the putter in hitting the golf ball. A microcontroller is used to process the information sent by the computer through RF communication and drive the robot motors for appropriate motions. The robot plays golf in a defined environment and avoids obstacles. A real golf ball with orange color is use during the game. The system utilizes global camera vision that serves as the eyes of the robot to know its dynamic environment for navigation. The vision system developed detects the position of the robot, golf hole, golf boundaries, and the golf ball within the playing field on real time using color object recognition algorithm. A modified golf tournament between autonomous robot golf player and man operated robot golf player was conducted. Results shows the accuracy and robustness of the autonomous robot developed in performing its tasks.

Słowa kluczowe

  • Edutainment Robots
  • Vision System
  • Image Processing
  • Golf Playing Robot
  • Fuzzy Logic System
access type Otwarty dostęp

Multi-Target, Multi-Sensor Tracking Based on Quality-Of-Information and Formal Bayesian Frameworks

Data publikacji: 02 Nov 2017
Zakres stron: 842 - 857

Abstrakt

Abstract

We consider a multi-target tracking problem that aims to simultaneously determine the number and state of mobile targets in the field. Conventional paradigms tend to report only the existence and state of targets according to centralized detection and data fusion. On the contrary, we investigate a multi-target, multi-sensor scenario in which (a) both the number and the state of the targets are unknown a priori; and (b) the detection with respect to targets is employed in a distributed manner. Toward this end, we exploit random set theory, a statistical tool based on Bayesian framework, for establishing generalized likelihood and Markov density functions to yield an iterative filtering procedure. We conduct a study regarding how the design of distributed detection has impact on the result of system level information fusion. The sources of analyzed data include (a) simulation-based sensor readings through bi-directional sensing/communication; and (b) practical images taken by multiple cameras through uni-directional sensing/communication. The formulation of Bayesian filtering suggests that a design of a tracking system be adaptive to change of detection performance.

Słowa kluczowe

  • Sensor networks
  • multi-target tracking
  • detection
  • random set theory
access type Otwarty dostęp

Advanced Predictive Guidance Navigation for Mobile Robots: A Novel Strategy for Rendezvous in Dynamic Settings

Data publikacji: 02 Nov 2017
Zakres stron: 858 - 890

Abstrakt

Abstract

This paper presents a novel on-line trajectory planning method for the autonomous robotic interception of moving targets in the presence of dynamic obstacles, i.e., position and velocity matching (also referred to as rendezvous). The novelty of the proposed time-optimal interception method is that it directly considers the dynamics of the obstacles as well as the target in its interception maneuver: the velocities and accelerations of the obstacles and the target are predicted in real-time for potential collisions. The method is designed to deal with highly- maneuvering obstacles and targets. The interception maneuver is computed using an Advanced Predictive Guidance Law.

Extensive simulation and experimental analyses, some of which are reported in this paper, have clearly demonstrated the time efficiency of the proposed rendezvous method.

Słowa kluczowe

  • Target interception
  • on-line trajectory planning
  • rendezvous guidance
access type Otwarty dostęp

A Robot Succeeds in 100% Mirror Image Cognition

Data publikacji: 02 Nov 2017
Zakres stron: 891 - 911

Abstrakt

Abstract

Humans are capable of identifying their own image when reflected in a mirror. This mechanism is a mystery that has never been solved. I created a program that achieved such awareness on a robot and conducted three experiments. The first was an experiment on a self robot that imitates its own self-image reflected in a mirror. The second experiment had a robot imitating another robot of the same type which was made to perform the same behavior. The last was an experiment using two robots of the same type and the same functions to imitate each other. In these experiments, the program calculated the coincidence rate of behavior between the self robot and the other robot. I found that compared with the case in which the robot performed a behavior according to its own judgment, the coincidence rate was always higher in the case of the mirror image. At this time, when the target moved according to its own judgment in the second experiment, this can be considered as a part of the self, similar to the use of “human hands and feet.” From this result, the mirror image can be judged to “exist closer to the self than a part of the self” and can in fact be considered a “self.” I thought that the result of these experiments indicated that mirror image cognition of the robot succeeded completely and that this would be the “first example toward explaining physically the mirror image cognition capability of humans.” This paper details logical and physical explanations for achieving the results, and in addition, presents several considerations and prospects derived from the experiment results.

Słowa kluczowe

  • Conscious system
  • robot demonstration
  • mirror test
  • mirror image cognition
  • behavior and cognition
  • self awareness
  • human consciousness
  • cognitivism
access type Otwarty dostęp

Training Data Compression Algorithms and Reliability in Large Wireless Sensor Networks

Data publikacji: 02 Nov 2017
Zakres stron: 912 - 921

Abstrakt

Abstract

With the availability of low-cost sensor nodes there have been many standards developed to integrate and network these nodes to form a reliable network allowing many different types of hardware vendors to coexist. Most of these solutions however have aimed at industry-specific interoperability but not the size of the sensor network and the large amount of data which is collected in course of its lifetime. In this paper we use well studied data compression algorithms which optimize on bringing down the data redundancy which is related to correlated sensor readings and using a probability model to efficiently compress data at the cluster heads. As in the case of sensor networks the data reliability goes down as the network resource depletes and these types of networks lacks any central synchronization making it even more a global problem to compare different reading at the central coordinator. The complexity of calibrating each sensor and using an adaptable measured threshold to correct the reading from sensors is a severe drain in terms of network resources and energy consumption. In this paper we separate the task of comparative global analysis to a central coordinator and use a reference PM ax which is a normalized probability of individual source which reflects the current lifetime reliability of the sensors calculated at the cluster heads which then is compared with the current global reliability index based on all the PMax of cluster heads. As this implementation does not need any synchronization at the local nodes it uses compress once and stamp locally without any threshold such as application specific calibration values (30±C ) and the summarization can be application independent making it more a sensor network reliability index and using it independent of the actual measured values.

access type Otwarty dostęp

Impedance Behaviour of a Microporous PMMA-Film ‘Coated Constant Phase Element’ based Chemical Sensor

Data publikacji: 02 Nov 2017
Zakres stron: 922 - 939

Abstrakt

Abstract

In this work, it has been attempted to characterize a new type of impedance sensor called constant phase element (CPE) sensor; which has microporous PMMA-film coating on the electrode surface. It has been shown that the ‘constant phase angle (CPA)’ behaviour is primarily due to the porous structure of the electrode surface. And the phase angle at the output of the sensor changes with thickness variation of the PMMA coating and ionic property of the medium in which the sensor is dipped in. The sensor has been used for chemical sensing. A phase angle detector circuit gives the output in voltage with the change in the phase angle. The complex impedance plots of the probes has also been discussed. The important fact is that the constructed CPE gives rise to a fractional order system.

Keyword

  • Chemical sensor
  • constant phase element
  • fractional order system
  • phase detector circuit
access type Otwarty dostęp

Sensitivity Improvement of Wireless Pressure Sensor by Incorporating a Saw Reflective Delay Line

Data publikacji: 02 Nov 2017
Zakres stron: 940 - 954

Abstrakt

Abstract

this paper presents a wireless surface acoustic wave (SAW) pressure sensor on 41oYX LiNbO3 for tire pressure monitoring system (TPMS) application, in which a reflective delay line composed of an interdigital transducer (IDT) and several reflectors was used as the sensor element. Using the coupling of modes (COM), the SAW reflective delay line was simulated, and the optimal design parameters were determined. The fabricated 2.4GHz SAW sensor was wirelessly characterized by the network analyzer. Sharp reflection peaks, few spurious signals, and relatively high signal-to-noise (S/N) ratio were observed. High sensitivity of 2.9 deg/kPa and good linearity were observed.

Słowa kluczowe

  • coupling of modes
  • interdigital transducer
  • LiNbO
  • piezoelectric substrate
  • reflective delay line
  • surface acoustic wave
  • wireless pressure sensor
  • temperature compensation
access type Otwarty dostęp

Implementation of linear trace moisture sensor by nano porous thin film moisture sensor and NLAmp

Data publikacji: 02 Nov 2017
Zakres stron: 955 - 969

Abstrakt

Abstract

Almost all type of moisture sensors has a non-linear response. With out linearization it is difficult to apply such a non-linear sensor in electronics circuits, specially in analog electronics. Non linear sensor and transducers characteristic can be linearized using analog electronics or digital electronics. In this paper a method of linearization of such non-linear sensors characteristics using analog electronics is described. Theoretical explanation of the methods and its verification by experiment is stated in this paper. It may possible to linearize any non linear characteristic using this method. We use thin film nano porous trace humidity sensor as a non linear device for the circuit justification. The fabrication process of the sensor is also described in this paper.

Słowa kluczowe

  • Differential slope
  • Amplifier gain control
  • Analog multiplexer
  • Trace moisture sensor
  • PWM
access type Otwarty dostęp

Detection of Transverse Cracks in a Composite Beam Using Combined Features of Lamb Wave and Vibration Techniques in Ann Environment

Data publikacji: 02 Nov 2017
Zakres stron: 970 - 984

Abstrakt

Abstract

The detection, location and sizing of transverse cracks in a composite beam, by combining damage features of Lamb wave and vibration based techniques in artificial neural network (ANN) environment, using numerical finite element model, is discussed. Four damage features, time of flight (TOF) and amplitude ratio, which are Lamb wave based features and first and second natural frequencies, which are vibration based features were used as input to ANN. The output of ANN was crack location and depth. It was demonstrated that through the simultaneous employment of features from the two modalities in an ANN environment, the sizing could be done more effectively.

Słowa kluczowe

  • Lamb wave
  • vibration
  • ANN
  • damage detection
  • crack
  • SHM
  • NDE
access type Otwarty dostęp

Development of an Fpga Based Smart Diagnostic System for Spirometric Data Processing Applications

Data publikacji: 02 Nov 2017
Zakres stron: 985 - 1018

Abstrakt

Abstract

The paper describes the development of an FPGA based fuzzy processing system for pulmonary spirometry applications predicting the approaching obstructive or restrictive pulmonary disorder of the patient before criticality actually occurs. The system employs a smart agent that accepts the Peak Expiratory Flow Rate (PEFR), Forced Expiratory Volume in 1 second (FEV1) and Forced Vital Capacity (FVC) data of patients. In order to speed up the computation process, hybrid parallel data processing architectures with dynamic scheduling mechanism have been employed leading to a speed up of approximately 12 times. The processor implemented on the FPGA can perform fuzzy inferencing at a speed of approximately 5.0 MFLIPS. The whole system is realized on Altera Cyclone EP1K6Q240C8 FPGA chip requiring 5,865 logic blocks. The system has been designed to be inexpensive, portable and user friendly for occupational health care applications in developing countries. Using the system, approaching pulmonary disorder of patients has been predicted with an accuracy of 95.83%.

Słowa kluczowe

  • Spirometry
  • fuzzy processor
  • hybrid parallel data processing architectures
  • smart agent
access type Otwarty dostęp

Design and Optimization of Bulk Micromachined Accelerometer for Space Applications

Data publikacji: 02 Nov 2017
Zakres stron: 1019 - 1030

Abstrakt

Abstract

The accelerometers used for Inertial Navigation in satellite launch vehicles demand excellent performance in terms of sensitivity, noise immunity, linearity, bias and scale factor stability over time and environmental changes. Detailed and in-depth design of the microstructure by computer simulation is required to ensure structural integrity and reliability of the microstructure. The microstructure of the accelerometer consists of a proof mass suspended from the mounting frame by beam springs. Extensive Finite Element simulation of the silicon microstructure has been carried out to obtain application specific optimum design parameters. Based on the deflection, frequency and stress analyses the optimum geometry and dimensions of the accelerometer have been determined. Noise analysis has been carried out, the performance of the accelerometer has been predicted and its compliance to the expected performance is ensured.

Słowa kluczowe

  • Microstructure
  • Microelectromechanical Systems
  • Accelerometer
access type Otwarty dostęp

Dynamic Measurements and Dynamically-Functioning Objects- Time Is to Look at Reality

Data publikacji: 02 Nov 2017
Zakres stron: 1031 - 1039

Abstrakt

Abstract

It is shown that many dynamic tests and measurement technologies base on a changing measurement equation and that internal and external disturbances may change the dynamic functional of the same object and that the reaction of measurement transducer (measurement channel) changes not only in dependence on type of loads. The reasons are given which cause methodical metering errors and make it difficult to build idealized smart sensing and intelligent systems

Słowa kluczowe

  • ‘bad’
  • posed problems
  • dynamic measurements
  • non-linear and chaotic dynamic
  • metering dynamic errors

Zaplanuj zdalną konferencję ze Sciendo