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Walker assistive devices play an important role in extending the autonomy of elderly people and in recovering the mobility of people affected by locomotion disabilities. The next generation of walkers are hoped to include embedded sensors and data processing capabilities that will allow for the extraction of objective metrics (about gait and body posture) to assist the work of physiotherapists and to enable the self-control nature of walker usage. The paper presents the Andante, our latest proposal of a smart walker intended to monitor and analyze gait in real time. The system makes use of e-textile electrodes to sense the heart rate of the user, load cells to measure the forces applied on the walker legs, and an inertial measurement unit to sense motion and orientation. These signals are sampled locally and transferred over a Bluetooth link to a remote host, where they are processed in real time. Data processing includes the detection, classification, and characterization of the steps. A rich set of parameters is presented for each step, including estimates of balance and motor coordination, step length and azimuth, and lift of the walker frame. This information can be used by physiotherapist to objectively assess the physical condition of the user and tune rehabilitation therapy if needed. The proposed solution can be easily integrated into any commercial walker without any loss of functionality.
Vitor Viegas; José Miguel Dias Pereira; Octavian Postolache; Pedro Silva Girão. Application of force and inertial sensors to monitor gait on legacy walkers. ACTA IMEKO 2019, 7, 33 -41.
AMA StyleVitor Viegas, José Miguel Dias Pereira, Octavian Postolache, Pedro Silva Girão. Application of force and inertial sensors to monitor gait on legacy walkers. ACTA IMEKO. 2019; 7 (4):33-41.
Chicago/Turabian StyleVitor Viegas; José Miguel Dias Pereira; Octavian Postolache; Pedro Silva Girão. 2019. "Application of force and inertial sensors to monitor gait on legacy walkers." ACTA IMEKO 7, no. 4: 33-41.
The design, implementation and tests of a system for assessment and monitoring movements, which includes the sensors from Kinect and Leap Motion Controller devices, are discussed in the present chapter. The advantages and some drawbacks of using the two devices for creating virtual environments for motor rehabilitation in which interaction of the user with virtual reality is made through natural user interfaces are described. The IoT architecture for rehabilitation environment, several serious games that our team have developed and the usability evaluation of the system are presented. Our insights, based on our research work during serious games development as well as on literature analysis, mainly focusing these on practicality of the developed serious games and on their acceptability for motor rehabilitation, are also included in the chapter. In the development of a system that includes IoT technology for movements tracking and progress evaluation during motor rehabilitation, the importance of user centered design is underscored.
Gabriela Postolache; Francisco Carry; Filipe Lourenço; Diogo Ferreira; Raul Oliveira; Pedro Silva Girão; Octavian Postolache. Serious Games Based on Kinect and Leap Motion Controller for Upper Limbs Physical Rehabilitation. Smart Sensors, Measurement and Instrumentation 2018, 147 -177.
AMA StyleGabriela Postolache, Francisco Carry, Filipe Lourenço, Diogo Ferreira, Raul Oliveira, Pedro Silva Girão, Octavian Postolache. Serious Games Based on Kinect and Leap Motion Controller for Upper Limbs Physical Rehabilitation. Smart Sensors, Measurement and Instrumentation. 2018; ():147-177.
Chicago/Turabian StyleGabriela Postolache; Francisco Carry; Filipe Lourenço; Diogo Ferreira; Raul Oliveira; Pedro Silva Girão; Octavian Postolache. 2018. "Serious Games Based on Kinect and Leap Motion Controller for Upper Limbs Physical Rehabilitation." Smart Sensors, Measurement and Instrumentation , no. : 147-177.
This paper presents a performance analysis of Artificial Neural Network (ANN) and Support Vector Machine (SVM) algorithms in arrhythmia identification task based on ECG signals. Six features are used for both algorithms: short signal 1-D wavelet energy (SS-WVE), short signal continuous wavelet transform mean (SS-CWTM), heart rate (HR), R-peaks root mean square (R-RMS), RR-peaks variance (RR-VAR) and QRS-complex standard deviation (QRS-SD). The identification methods use the MIT–BIH Dataset (Massachusetts Institute of Technology–Beth Israel Hospital) for training, validation and test phases. In this work, preliminary results shown that the classification obtained using SVM is marginally better than the one obtained with the ANN classifier for the same classification task (i.e. arrhythmia pattern identification).
V C C Roza; A M Almeida; P M B Silva Girão; O A Postolache. Performance Analysis of ANN and SVM in ECG Based Arrhythmia Identification. Journal of Physics: Conference Series 2018, 1065, 132004 .
AMA StyleV C C Roza, A M Almeida, P M B Silva Girão, O A Postolache. Performance Analysis of ANN and SVM in ECG Based Arrhythmia Identification. Journal of Physics: Conference Series. 2018; 1065 (13):132004.
Chicago/Turabian StyleV C C Roza; A M Almeida; P M B Silva Girão; O A Postolache. 2018. "Performance Analysis of ANN and SVM in ECG Based Arrhythmia Identification." Journal of Physics: Conference Series 1065, no. 13: 132004.
Radioembolisation (RE) is a minimally invasive therapy for primary/metastatic liver tumours. Yttrium-90 (90Y) microspheres (MS) are infused through the hepatic artery. Positron emission tomography (PET) allows visualisation of the 90Y-MS distribution in the liver after the RE procedure. All patients are submitted to a pretherapeutic Technetium-99m (99mTc) macroaggregated albumin (MAA) perfusion scintigraphy and single-photon emission computed tomography (SPECT) liver imaging. This work investigates the value of pre-treatment 99mTc-MAA SPECT to predict intrahepatic 90Y-MS treatment dosimetry, using the gamma-index (γ-index) analytical method. Six treatments with MAA and MS administered in the same hepatic artery branches were retrospectively selected. Multimodal images were used for semi-automatic and manual segmentation of liver and tumour volumes. Absorbed dose was calculated on SPECT and PET maps using the Imalytics Research Workstation (Philips). The γ-index calculation and analysis were performed using ‘in-house’ software with multiple distance to agreement (DTA) and dose difference (DD) tolerance criteria. γ-index passing rate values of 80% and > 90% were achieved for respectively conservative 10 mm/10% and less conservative 15 mm/15% (DTA/DD) tolerance criteria. RE treatments performed in similar conditions to planning give γ-index passing rates (several DTA/DD criteria) indicating potential predictive power of dosimetry planning for post-radioembolisation dosimetry outcome.
Paulo Ferreira; Francisco P. M. Oliveira; Rui Parafita; Pedro S. Girão; Paulo L. Correia; Durval C. Costa. Patient-specific gamma-index analysis to evaluate 99mTc-MAA as a predictor for 90Y glass microspheres liver radioembolisation dosimetry. Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization 2018, 7, 583 -589.
AMA StylePaulo Ferreira, Francisco P. M. Oliveira, Rui Parafita, Pedro S. Girão, Paulo L. Correia, Durval C. Costa. Patient-specific gamma-index analysis to evaluate 99mTc-MAA as a predictor for 90Y glass microspheres liver radioembolisation dosimetry. Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization. 2018; 7 (5-6):583-589.
Chicago/Turabian StylePaulo Ferreira; Francisco P. M. Oliveira; Rui Parafita; Pedro S. Girão; Paulo L. Correia; Durval C. Costa. 2018. "Patient-specific gamma-index analysis to evaluate 99mTc-MAA as a predictor for 90Y glass microspheres liver radioembolisation dosimetry." Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization 7, no. 5-6: 583-589.
This paper presents the Spy Waìker, a measurement system intended to characterize gait in walker assistive devices. The proposed system can be easily integrated into any commercial walker without any loss of native functionality. The system makes use of e-textile electrodes to sense the heart rate of the user, load cells to measure the force applied on the walker legs, and an inertial measurement unit to sense motion and orientation. These signals are sampled locally and then transferred over a Bluetooth link to a remote host where they are processed in real time. Data processing includes the detection, classification and characterization of steps. A rich set of parameters is presented for each step, including estimates of unbalance and motor incoordination, travelled distance and azimuth, and lift of the walker frame. This information can be used by a physiotherapist to assess objectively the physical condition of the user, and tune the rehabilitation therapy if needed.
Vitor Viegas; José Pereira; Octavian Postolache; Pedro Silva Girao. Spy walker: A convenient way to assess gait in walker assistive devices. 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) 2018, 1 -6.
AMA StyleVitor Viegas, José Pereira, Octavian Postolache, Pedro Silva Girao. Spy walker: A convenient way to assess gait in walker assistive devices. 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). 2018; ():1-6.
Chicago/Turabian StyleVitor Viegas; José Pereira; Octavian Postolache; Pedro Silva Girao. 2018. "Spy walker: A convenient way to assess gait in walker assistive devices." 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) , no. : 1-6.
This paper presents a measurement system intended to monitor the usage of walker assistive devices. The goal is to guide the user in the correct use of the device in order to prevent risky situations and maximize comfort. Two risk indicators are defined: one related to force unbalance and the other related to motor incoordination. Force unbalance is measured by load cells attached to the walker legs, while motor incoordination is estimated by synchronizing force measurements with distance data provided by an optical sensor. The measurement system is equipped with a Bluetooth link that enables local supervision on a computer or tablet. Calibration and experimental results are included in the paper.
Vítor Viegas; J. M. Dias Pereira; Octavian Postolache; Pedro Silva Girão. Monitoring Walker Assistive Devices: A Novel Approach Based on Load Cells and Optical Distance Measurements. Sensors 2018, 18, 540 .
AMA StyleVítor Viegas, J. M. Dias Pereira, Octavian Postolache, Pedro Silva Girão. Monitoring Walker Assistive Devices: A Novel Approach Based on Load Cells and Optical Distance Measurements. Sensors. 2018; 18 (2):540.
Chicago/Turabian StyleVítor Viegas; J. M. Dias Pereira; Octavian Postolache; Pedro Silva Girão. 2018. "Monitoring Walker Assistive Devices: A Novel Approach Based on Load Cells and Optical Distance Measurements." Sensors 18, no. 2: 540.
Data from the survey on patients' perspectives on electronic health records requirements and barriers for adoption in physiotherapy are presented and discussed in view of tailoring information and communication technologies (ICTs) to support physiotherapy for rural elderly. Socio-demographic data on rural elderly suggest that they could not be aware or understand the ICTs based healthcare tools that may improve accessibility and quality of care. By integrating personally controlled health records, patient reported outcomes and educational resources, the understanding and efficient use of health information technologies may increase and medical errors may be prevented.
Gabriela Postolache; Raul Oliveira; Pedro Silva Girao; Miguel Dias Pereira; Octavian Postolache. Tailoring information and communication technologies to support physiotherapy for rural elderly. 2017 E-Health and Bioengineering Conference (EHB) 2017, 93 -96.
AMA StyleGabriela Postolache, Raul Oliveira, Pedro Silva Girao, Miguel Dias Pereira, Octavian Postolache. Tailoring information and communication technologies to support physiotherapy for rural elderly. 2017 E-Health and Bioengineering Conference (EHB). 2017; ():93-96.
Chicago/Turabian StyleGabriela Postolache; Raul Oliveira; Pedro Silva Girao; Miguel Dias Pereira; Octavian Postolache. 2017. "Tailoring information and communication technologies to support physiotherapy for rural elderly." 2017 E-Health and Bioengineering Conference (EHB) , no. : 93-96.
Recent advances in low-cost natural user interfaces such as Microsoft Kinect and Leap Motion controller allow the Virtual Reality implementation of 3D serious games for, posture, upper limb and lower limb rehabilitation purposes. However, it is very important to compare the results obtained by the users that train in virtual and real environments. This paper presents a virtual reality serious game for upper limb rehabilitation using a natural user interface expressed by Leap Motion controller. One of the developed virtual reality serious game for rehabilitation is converted to a real scenario with the same elements and rules and the same aims of physical rehabilitation. In order to extract appropriate information from the serious game based on real objects a RFID technology was used together with software components developed in LabVIEW. The evaluation of hand muscles' activity during the training session is based on the usage of thermography that permits to measure in an unobtrusive way the distribution of the temperature on the hands' level. Based on analysis of thermographic images obtained before and after serious game practice, the level of activity of specific muscles associated with training for virtual and real scenario is extracted. Experimental results that are also included in the paper underline the effectiveness of the proposed method for the comparison of the training in virtual and real scenarios.
Octavian Postolache; Filipe Lourenco; J. M. Dias Pereira; Pedro Silva Girao. Serious game for physical rehabilitation: Measuring the effectiveness of virtual and real training environments. 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) 2017, 1 -6.
AMA StyleOctavian Postolache, Filipe Lourenco, J. M. Dias Pereira, Pedro Silva Girao. Serious game for physical rehabilitation: Measuring the effectiveness of virtual and real training environments. 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). 2017; ():1-6.
Chicago/Turabian StyleOctavian Postolache; Filipe Lourenco; J. M. Dias Pereira; Pedro Silva Girao. 2017. "Serious game for physical rehabilitation: Measuring the effectiveness of virtual and real training environments." 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) , no. : 1-6.
Connected healthcare devices, including medical equipments as well as personal health devices based on emerging mobile technologies used by healthcare providers and consumers, are expanding traditional means of practicing healthcare particularly physiotherapy services. We describe a system based on physiotherapy smart connected devices, as smart walker, smart crutches, force platform and natural user interface devices — characterized by different sensing technologies including piezorezistive force sensors and microwave radars. The information from the physiotherapy connected devices is stored and shared based on client-server architecture. Signals and metrics that combine the data from connected devices and serious games associated with physical rehabilitation are presented in the paper.
Octavian Postolache; Pedro Silva Girao. Physiotherapy smart connected devices for S-health. 2016 7th International Conference on Information, Intelligence, Systems & Applications (IISA) 2016, 1 -6.
AMA StyleOctavian Postolache, Pedro Silva Girao. Physiotherapy smart connected devices for S-health. 2016 7th International Conference on Information, Intelligence, Systems & Applications (IISA). 2016; ():1-6.
Chicago/Turabian StyleOctavian Postolache; Pedro Silva Girao. 2016. "Physiotherapy smart connected devices for S-health." 2016 7th International Conference on Information, Intelligence, Systems & Applications (IISA) , no. : 1-6.
Heart motion and blood ejection during the cardiac cycle originates a set of body vibrations that are sensed through the usage of different sensing systems that provide the information on cardiac mechanics and cardiac output. Ballistocardiogram (BCG) and seismocardiogram (SCG) are the recording of body vibration induced by heart bit. The sensing of the BCG requires mechanical contact between the user body parts equipment and furniture embedded BCG sensing to provide data for that can be used to validate the BCG models. The heart activity generates a set of forces and reverberations that may be modeled in two directions, anteroposterior and dorsoventral. As the ballistocardiogram sensing is usually done at the person's back or at the posterior pelvic region the cardiac forces models are associated with these two directions. Additionally a set of results including the designed models simulations and the BCG validation signals obtained from BCG sensing systems prototypes are included in the paper.
Eduardo Pinheiro; Octavian Postolache; Pedro Silva Girao. Ballistocardiogram: Model and sensing systems. 2016 10th International Conference on Sensing Technology (ICST) 2016, 1 -6.
AMA StyleEduardo Pinheiro, Octavian Postolache, Pedro Silva Girao. Ballistocardiogram: Model and sensing systems. 2016 10th International Conference on Sensing Technology (ICST). 2016; ():1-6.
Chicago/Turabian StyleEduardo Pinheiro; Octavian Postolache; Pedro Silva Girao. 2016. "Ballistocardiogram: Model and sensing systems." 2016 10th International Conference on Sensing Technology (ICST) , no. : 1-6.
The paper presents a simulation tool that emulates the development environment of Foundation Fieldbus (FF) applications. The idea is to use the resources provided by LabVIEW®—in particular its dataflow programming paradigm—to design, execute, and debug FF control applications. Function blocks are implemented as virtual instruments, data links are represented by virtual wires, and bus monitoring tools are replaced by application debugging tools. The simulator can easily be connected to virtual (simulated) processes or to physical (real) processes. Tests were made to evaluate the capabilities of the simulator and to assess its degree of fidelity against commercial FF systems. The goal was to release an easy-to-use, low-cost training tool to disseminate knowledge about process control using the FF technology. © 2016 Wiley Periodicals, Inc. Comput Appl Eng Educ 24:914–925, 2016; View this article online at wileyonlinelibrary.com/journal/cae; DOI 10.1002/cae.21761
Vítor Viegas; Octavian Adrian Postolache; Pedro M. B. Silva Girão; José M. Dias Pereira. Quimera: The easy way to simulate Foundation Fieldbus applications. Computer Applications in Engineering Education 2016, 24, 914 -925.
AMA StyleVítor Viegas, Octavian Adrian Postolache, Pedro M. B. Silva Girão, José M. Dias Pereira. Quimera: The easy way to simulate Foundation Fieldbus applications. Computer Applications in Engineering Education. 2016; 24 (6):914-925.
Chicago/Turabian StyleVítor Viegas; Octavian Adrian Postolache; Pedro M. B. Silva Girão; José M. Dias Pereira. 2016. "Quimera: The easy way to simulate Foundation Fieldbus applications." Computer Applications in Engineering Education 24, no. 6: 914-925.
The paper discusses the evaluation of the uncertainty of a multivariate quantity using the Law of Propagation of Uncertainty defined in the Guide to the Expression of Uncertainty in Measurement (GUM) and a Monte Carlo method according to the GUM’s Supplement 2. The quantity analysed is the electrical impedance, which is not a scalar but a complex quantity. The used measuring method allows the evaluation of the impedance and of its uncertainty in different ways and the corresponding results are presented, compared and discussed. For comparison purposes, results of the impedance uncertainty obtained using the NIST Uncertainty Machine are also presented.
Pedro M. Ramos; Fernando Janeiro; Pedro S. Girão. Uncertainty evaluation of multivariate quantities: A case study on electrical impedance. Measurement 2016, 78, 397 -411.
AMA StylePedro M. Ramos, Fernando Janeiro, Pedro S. Girão. Uncertainty evaluation of multivariate quantities: A case study on electrical impedance. Measurement. 2016; 78 ():397-411.
Chicago/Turabian StylePedro M. Ramos; Fernando Janeiro; Pedro S. Girão. 2016. "Uncertainty evaluation of multivariate quantities: A case study on electrical impedance." Measurement 78, no. : 397-411.
This paper presents a method for ultrasonic ranging based on the cross-correlation of two multi-frequency signals. The stimulus signal is composed by multiple sine-wave bursts/segments, each containing a different frequency and an integer number of periods. The frequency of each sine-wave burst is different from that of the adjacent bursts, but it is very close to the transducer resonant frequency. The time-of-flight (TOF) is estimated by finding the maximum of the cross-correlation. Interpolation is used to increase the measurement resolution. The experimental error corresponding to two standard deviations, for a range up to 1 m, is less than 0.3 mm.
Ricardo Queirós; Francisco Corrêa Alegria; Pedro Silva Girão; António Cruz Serra. A multi-frequency method for ultrasonic ranging. Ultrasonics 2015, 63, 86 -93.
AMA StyleRicardo Queirós, Francisco Corrêa Alegria, Pedro Silva Girão, António Cruz Serra. A multi-frequency method for ultrasonic ranging. Ultrasonics. 2015; 63 ():86-93.
Chicago/Turabian StyleRicardo Queirós; Francisco Corrêa Alegria; Pedro Silva Girão; António Cruz Serra. 2015. "A multi-frequency method for ultrasonic ranging." Ultrasonics 63, no. : 86-93.
In the last decade, the clinical reasoning in physical therapy has been to develop systems for physiotherapists to make clinical decisions rapidly, effectively and efficiently, in response to the increasingly complex needs of health and rehabilitation units [1]-[3]. Some studies show the importance of walking aids during rehabilitation from some diseases, and after surgery for arthroplasty in the elderly population [4], and in elderly patients with balance disorders, muscle weakness [5] or in people with diabetes mellitus [6]. Walkers are important devices that aid the rehabilitation process. The use of a walker is recommended for gait changes and imbalance due to various factors, such as surgery of the lower limbs or neurodegenerative changes, especially in the early recovery period [7].
Octavian Postolache; José Pereira; Vítor Viegas; Luisa Pedro; Pedro Silva Girão; Raul Oliveira; Gabriela Postolache. Smart walker solutions for physical rehabilitation. IEEE Instrumentation & Measurement Magazine 2015, 18, 21 -30.
AMA StyleOctavian Postolache, José Pereira, Vítor Viegas, Luisa Pedro, Pedro Silva Girão, Raul Oliveira, Gabriela Postolache. Smart walker solutions for physical rehabilitation. IEEE Instrumentation & Measurement Magazine. 2015; 18 (5):21-30.
Chicago/Turabian StyleOctavian Postolache; José Pereira; Vítor Viegas; Luisa Pedro; Pedro Silva Girão; Raul Oliveira; Gabriela Postolache. 2015. "Smart walker solutions for physical rehabilitation." IEEE Instrumentation & Measurement Magazine 18, no. 5: 21-30.
A survey of wireless sensor network solutions for gait assessment is presented including own developed solution gait assessment based on smart insoles nodes ZigBee compatible characterized by multichannel force measurement and MEMS inertial measurement IMU. The system was developed to measure ground reaction force, acceleration and direction of feet in order to provide information to physiotherapists for an objective evaluation of rehabilitation effectiveness. Based on acquired data from the sensing channels a set of gait feature extraction such as walking speed stride length, swing time are calculated as part of gait analysis. Software for WSN node control, gait feature calculation and primary analysis of rehabilitation effectiveness developed for the physiotherapist was designed and implemented and preliminary tests were carried out for normal and simulated anomalous gait.
Octavian Postolache; José M. D. Pereira; Pedro Silva Girão; Gabriela Postolache. WSN gait monitoring for objective evaluation of rehabilitation process. 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) 2015, 3, 1637 -1641.
AMA StyleOctavian Postolache, José M. D. Pereira, Pedro Silva Girão, Gabriela Postolache. WSN gait monitoring for objective evaluation of rehabilitation process. 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI). 2015; 3 ():1637-1641.
Chicago/Turabian StyleOctavian Postolache; José M. D. Pereira; Pedro Silva Girão; Gabriela Postolache. 2015. "WSN gait monitoring for objective evaluation of rehabilitation process." 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) 3, no. : 1637-1641.
This paper presents a distributed control and measurement system based on the Foundation Field Bus protocol. A system's prototype is described together with some implementation details and experimental results. The system also includes interfaces for conventional measurement and control devices that are connected through 4-20 mA current loops. The proposed prototype seems to be a very suitable solution for teaching purposes since it is an open solution that can be used to integrate devices from different manufacturers, as long as the prototype is provided with the appropriate interface.
J. M. Dias Pereira; Vitor Viegas; Octavian Postolache; Pedro Silva Girao. Fieldbus: Developing a laboratory prototype for learning purposes. 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) 2015, 1, 387 -391.
AMA StyleJ. M. Dias Pereira, Vitor Viegas, Octavian Postolache, Pedro Silva Girao. Fieldbus: Developing a laboratory prototype for learning purposes. 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI). 2015; 1 ():387-391.
Chicago/Turabian StyleJ. M. Dias Pereira; Vitor Viegas; Octavian Postolache; Pedro Silva Girao. 2015. "Fieldbus: Developing a laboratory prototype for learning purposes." 2015 12th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) 1, no. : 387-391.
Human gait is a complex motion that implies the movement of different parts of the body such as arms, legs and feet, being the functional human movements' analysis indispensable for bio-mechanical diagnostic and treatment tool for clinics and rehabilitation services. During the rehabilitation process, walkers are frequently prescribed to improve the patient's stability but can also be transformed into instruments for quantitative evaluation of rehabilitation progress by embedding sensors to capture the motion characteristics. In this work, a practical approach concerning the possibilities to use microwave Doppler radars embedded in four wheels walkers for gait capture is presented. The signals acquired from the sensors are processed using time-frequency transform such as STFT. A set of gait characteristics, such as gait velocity and stride rate, are extracted based on wavelet signal processing, STFT spectrogram and moving average filtering. A set of spectrogram features is calculated to discriminate between normal and abnormal gait.
Octavian Postolache; J.M. Dias Pereira; Vítor Viegas; Pedro Silva Girão; Postolache O.; Viegas V.; Silva Girao P.. Gait rehabilitation assessment based on microwave Doppler radars embedded in walkers. 2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings 2015, 208 -213.
AMA StyleOctavian Postolache, J.M. Dias Pereira, Vítor Viegas, Pedro Silva Girão, Postolache O., Viegas V., Silva Girao P.. Gait rehabilitation assessment based on microwave Doppler radars embedded in walkers. 2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings. 2015; ():208-213.
Chicago/Turabian StyleOctavian Postolache; J.M. Dias Pereira; Vítor Viegas; Pedro Silva Girão; Postolache O.; Viegas V.; Silva Girao P.. 2015. "Gait rehabilitation assessment based on microwave Doppler radars embedded in walkers." 2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA) Proceedings , no. : 208-213.
This paper presents a low cost measurement system that can be used to extract kinematic parameters from walker devices. The proposed measurement system can be easily integrated in any commercial non-smart walker device and includes mainly a set of six force sensing resistors and one 3D accelerometer, with the associated signal conditioning circuits, and the data acquisition and processing unit with wireless communication capabilities. The signals that are acquired from the sensors are used to obtain, in real time, the values of several variables related with strength, acceleration and tilt angles that are associated with the usage of walker devices. The proposed measurement system enables the detection of conditions that are related with a deficient usage of the walker device, such as, bad positioning of the walker legs during gait, amplitude and timing unbalances of the forces applied on the walker legs or on the walker hand grips, excessive values of mechanical oscillations or tilt angles of the walker device. Some calibration and experimental results are included in the paper.
J.M. Dias Pereira; Octavian Postolache; Vítor Viegas; Pedro Silva Girão; Dias Pereira J.M.; Postolache O.; Viegas V.; Silva Girao P.. A low cost measurement system to extract kinematic parameters from walker devices. 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings 2015, 1991 -1996.
AMA StyleJ.M. Dias Pereira, Octavian Postolache, Vítor Viegas, Pedro Silva Girão, Dias Pereira J.M., Postolache O., Viegas V., Silva Girao P.. A low cost measurement system to extract kinematic parameters from walker devices. 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings. 2015; ():1991-1996.
Chicago/Turabian StyleJ.M. Dias Pereira; Octavian Postolache; Vítor Viegas; Pedro Silva Girão; Dias Pereira J.M.; Postolache O.; Viegas V.; Silva Girao P.. 2015. "A low cost measurement system to extract kinematic parameters from walker devices." 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings , no. : 1991-1996.
The paper presents a smart sensing system for health monitoring based on the IEEE 1451 standard. The system makes use of smart transducer interfaces, namely the 1451.1 information model and 1451.4 transducer data sheets. Attention is given to the implementation of the 1451.1 information model using the .NET Framework, including the customization efforts to meet the requirements of a specific application, which, in the present case, consists of a smart wheelchair prepared to monitor the user's physical condition. Experimental tests were done to characterize the sensing channels and to evaluate the communication capabilities of the system. Results are analyzed and conclusions extracted about the effectiveness of the system and its overall performance.
Vítor Viegas; José Pereira; Pedro Silva Girao; Gabriela Postolache; Octavian Postolache. Smart transducer interfaces applied to health monitoring. 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings 2015, 1640 -1645.
AMA StyleVítor Viegas, José Pereira, Pedro Silva Girao, Gabriela Postolache, Octavian Postolache. Smart transducer interfaces applied to health monitoring. 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings. 2015; ():1640-1645.
Chicago/Turabian StyleVítor Viegas; José Pereira; Pedro Silva Girao; Gabriela Postolache; Octavian Postolache. 2015. "Smart transducer interfaces applied to health monitoring." 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings , no. : 1640-1645.
Multiple influence quantities affect environmental sensing and measurement (ESM) systems. Accounting for their variations over time promotes metrological comparability and traceability of measurement results. Using suitable data processing techniques allows identification of the main influence quantities that affect the measurement result of a given quantity and allows evaluation of the associated compensation coefficients. This paper presents several concerns related to implementation of ESM systems, paying particular attention to the impact of the multiple of measuring and influence quantities on system performance. A review of different data processing techniques to compensate for the effects of influence quantities is presented. A case study based on water conductivity measurements is used to illustrate the capability of artificial neural network (ANN) based techniques and to cope with errors due to a low number of measurement values and due to collinear effects between influence quantities.
Miguel Dias Pereira; Octavian Postolache; Pedro Silva Girao. Using neural network techniques in environmental sensing and measurement systems to compensate for the effects of influence quantities. IEEE Instrumentation & Measurement Magazine 2014, 17, 26 -56.
AMA StyleMiguel Dias Pereira, Octavian Postolache, Pedro Silva Girao. Using neural network techniques in environmental sensing and measurement systems to compensate for the effects of influence quantities. IEEE Instrumentation & Measurement Magazine. 2014; 17 (6):26-56.
Chicago/Turabian StyleMiguel Dias Pereira; Octavian Postolache; Pedro Silva Girao. 2014. "Using neural network techniques in environmental sensing and measurement systems to compensate for the effects of influence quantities." IEEE Instrumentation & Measurement Magazine 17, no. 6: 26-56.