In this paper novel compression techniques are developed for portable heart-monitoring equipment ... more In this paper novel compression techniques are developed for portable heart-monitoring equipment that could also form the basis for more intelligent diagnostic systems thanks to the way the compression algorithms depend on signal classification. There are two main categories of compression which are employed for electrocardiogram signals: lossless and lossy. Design of an optimal Wiener filter is implemented to remove noise from a signal, considering that the signal is statistically stationary and the noise is a stationary random process that is statistically independent of the signal. Two programs for compression and Wiener optimal filtering are realised in MATLAB.
Modified Langendorff experimental device for rat heart decellularization with a vibrating fluid column
2020 International Symposium on Electronics and Telecommunications (ISETC)
In the present paper we propose the design and realization of an experimental device of Langendor... more In the present paper we propose the design and realization of an experimental device of Langendorff type, controlled in pressure and with the vibrating column of fluid, used for decellularization of the rat heart with a surfactant solution of sodium dodecyl sulfate (SDS). The experimental device consists of two constructive parts: a hydraulic-electronic part that ensures constant pressure for retrograde heart perfusion and an electromagnetic assembly that induces the vibration of the liquid column in the immediate vicinity of the device cannula with a frequency of 15 Hz. The decellularization solution is recirculated during the experiment, so that by serial spectrophotometric determinations of the concentration of deoxyribonucleic acid (DNA) and proteins in this solution can determine the kinetics of decellularization and the moment when it is completed.
Software Validation For Automatic Heart Decellularization
2021 16th International Conference on Engineering of Modern Electric Systems (EMES), 2021
In this paper, we propose a software application for validating the automated decellularization p... more In this paper, we propose a software application for validating the automated decellularization process for a rat heart. This pilot study implemented a latex balloon that simulates a heart in which initially we introduced dye, using a syringe pump for clinical use. Then we pumped water with a controlled flow, so finally, we replaced this dye with injected water. With this design, we can validate the software application because it automatically detects the moment when the simulated heart completely discolored, and turned off the entire system, which is equivalent to total real heart decellularization. During this process, photos were automatically taken at a certain interval, selected by the user. Photos were processed according to the selected area at the beginning of each experiment. The data collected was stored and the evolution of the dye from the simulated heart was plotted. In other words, once validated, this application can be used further in the entire system created specifically for the decellularization of a rat heart. Because decellularization is a generally long process, which currently requires a lot of manual operations and supervision, the main goal in our study is to design an automated system for the entire decellularization process, so that it eliminates collecting samples for the method of ultraviolet spectrophotometry.
Four ways to improve the capabilities of a virtual instrument involving a microcontroller are cov... more Four ways to improve the capabilities of a virtual instrument involving a microcontroller are covered in this paper. They are structural modeling and programming, real-time control, asynchronous communication between the microcontroller and the host PC, and system integration. This paper covers 4 common problems encountered by embedded developers and 5 solutions to the 4 problems. The solutions and examples demonstrated in this article will help readers build robust and reliable virtual instruments for crucial applications.
Abstract:- QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) pr... more Abstract:- QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing and analysis. Large variety of methods have been proposed and used, featuring high percentages of correct detection. Nevertheless, the problem remains open especially with respect to higher detection accuracy in noisy ECGs. LabVIEW ( Laboratory Virtual Instrument Engineering Workbench) is a graphical programming language that uses icons instead of lines of text to create programs. We developed in LabVIEW the filtering for removal of artifacts in biomedical signals and the Pan-Tompkins algorithm. We have investigated problems posed by artifact, noise and interference of various forms in the acquisition and analysis of several biomedical signals. We have also established links between the characteristics of certain epochs in a number of biomedical signals and the corresponding physiological or pathological events in the biomedical systems of concern. Event detection is an importan...
Multiple Convolutional Neural Networks for Diabetic Retinopathy Classification
2021 International Conference on e-Health and Bioengineering (EHB), 2021
Diabetic retinopathy (DR) is a complication of diabetes, caused by high blood sugar levels damagi... more Diabetic retinopathy (DR) is a complication of diabetes, caused by high blood sugar levels damaging the retina blood vessels, and can lead to vision loss if it is not treated or detected in initial phases. Convolutional neural networks (CNNs) were used to classify multiple DR images on different stages for the early diagnosis purposes. Improving the accuracy and precision of examination, developing the classification of cases of diabetic retinopathy by severity are essential steps in treating diabetic retinopathy and other eye diseases.
Extension of a Glycaemic Control Medical Application with New Functions and Ergonomic User Interface Elements
2018 International Symposium on Electronics and Telecommunications (ISETC), 2018
The human body is composed of numerous highly complex metabolic processes. Abnormal variation of ... more The human body is composed of numerous highly complex metabolic processes. Abnormal variation of the blood glucose concentration is a common complication in the intensive care units. This paper presents a model-based method of glycaemic control and a medical application implementing the glycaemic control protocol. The principal cases were to extend the functionality of the application in order to automatically create multiple episodes for a patient already in the database of the application and an accessibly view for previous treatments calculation. These functions are very helpful and convenient because allow to the clinicians to have new measurements and a treatment calculation without entering the data of the patient again in the system. The visualization of previous treatments can be efficiently used to define optimized dosing for the subsequent treatment period. The paper concludes with the results of the extension of the medical application.
QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing an... more QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing and analysis. Large variety of methods have been proposed and used, featuring high percentages of corr...
Tumor Detection and Classification of MRI Brain Image using Different Wavelet Transforms and Support Vector Machines
2019 42nd International Conference on Telecommunications and Signal Processing (TSP), 2019
The brain is one of the most complex organs in the human body that works with billions of cells. ... more The brain is one of the most complex organs in the human body that works with billions of cells. A cerebral tumor occurs when there is an uncontrolled division of cells that form an abnormal group of cells around or within the brain. This cell group can affect the normal functioning of brain activity and can destroy healthy cells. Brain tumors are classified as benign or low-grade (grade 1 and 2) and malignant tumors or high-grade (grade 3 and 4). The proposed methodology aims to differentiate between normal brain and tumor brain (benign or malign). The study of some types of brain tumors such as metastatic bronchogenic carcinoma tumors, glioblastoma and sarcoma are performed using brain magnetic resonance imaging (MRI). The detection and classification of MRI brain tumors are implemented using different wavelet transforms and support vector machines. Accurate and automated classification of MRI brain images is extremely important for medical analysis and interpretation.
Environmental Engineering and Management Journal, 2010
This paper introduces the first station in Romania (Eastern Europe) outfitted for systematic moni... more This paper introduces the first station in Romania (Eastern Europe) outfitted for systematic monitoring of solar irradiance on tilted surfaces. The resulted database is in many aspects unique for Romania, allowing for the first time to derive specific parameters like diffuse fraction or sunshine number. Also for the first time, the data collected on tilted surfaces can be used to test models reported in literature and to recommend the most fitting for the region, as is detailed in the paper.
Results of studying the degradation of the silicon solar cells subjected to irradiation with prot... more Results of studying the degradation of the silicon solar cells subjected to irradiation with protons are reported. The macroscopic properties of the cells, such as current-voltage characteristics, serial/parallel resistances, fill factor and efficiency, are examined before and after irradiation. Proton irradiation was performed at the Tandem Accelerator of IFIN-HH, Bucharest. The solar cells were characterized under standard AM0 solar flux at the PV Lab of the West University of Timisoara. The results show that the proton irradiation changes the overall properties of the solar cell, causing a considerable degradation of its performances.
The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learni... more The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learning process is based on "Learning by Doing" paradigm supported by several learning tools: electronic course materials, interactive simulation, laboratory plants and real experiments accessed by Web Publishing Tools under LabVIEW. Built on LabVIEW and accompanied by a robust, flexible and versatile hardware, the experiment allows a comprehensive study by remote controlling and performing real measurements on the inverters. The study is offered in a gradual manner, according to the Leonardo da Vinci project EDIPE (E-learning Distance Interactive Practical Education) philosophy: theoretical aspects followed by simulations, while in the end the real experiments are investigated. Studying and experimenting access is opened for 24 hours a day, 7 days a week under the Moodle booking system.
In the present paper we are interested in compression and noise removal as a preprocessor for the... more In the present paper we are interested in compression and noise removal as a preprocessor for the identification of microcalcification clusters in mammograms. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) is a graphical programming language that uses icons instead of lines of text to create programs. We propose a general strategy for constructing algorithms and implementing them in LabVIEW for compression, noise removal and extracting microcalcification clusters. The comparison method presented in this paper aims to improve mammogram comparison by estimating the underlying geometric transformation for any mammogram sequence. It takes into consideration the various temporal changes that may occur between successive scans of the same woman and is designed too overcome the inconsistencies of mammogram image formation.
2014 IEEE Frontiers in Education Conference (FIE) Proceedings, 2014
This paper presents the implementation of a Virtual Instrumentation (VI) based system which is us... more This paper presents the implementation of a Virtual Instrumentation (VI) based system which is used for remote monitoring of biogas production activities. The proposed measurement approach was designed and is used by students during Measurement and Instrumentation lectures. It combines hardware and software knowledge while allowing the users to interact with a domain of great interest-biogas production. The software component was developed using National Instruments' LabVIEW while dedicated gas sensors have been employed for gas concentration monitoring. The application can be used via mobile devices since it includes a Data Dashboard (DD) interface. This feature has been considered since the proliferation of remote monitoring, with the help of mobile tools, has earned a great interest in the last years. Of course, by using a computer with Internet connectivity, the students are able to connect to the measurement front panel and operate the proposed experiments. Testing of experimental results has been performed with dedicated stand alone instruments. Consequently, the students have the possibility of discussing important VI aspects compared against classic methodologies impacting the test and measurement of biogas production emissions.
Proceedings of the 6th International Conference on Optimization of Electrical and Electronic Equipments
The paper peflotms an analysis of the series resonant converter using a general averaged model. A... more The paper peflotms an analysis of the series resonant converter using a general averaged model. A nonlinear time invariant large signal averaged model describing the large signal behaviour of the converter is obtained in a closed form which can easily be embedded in a computer program. The model is general in the sense that it can be used for converters
2008 11th International Conference on Optimization of Electrical and Electronic Equipment, 2008
The measurement of shielding effectiveness of coaxial cables is often limited by the dynamic rang... more The measurement of shielding effectiveness of coaxial cables is often limited by the dynamic range of the measurement system. This paper presents a new test procedure for measuring the shielding effectiveness (SE) of shielded coaxial cables. The TEH modified measurement cell with an asymmetrically placed conductor and the proposed form of the cell establish in the zone, where the cable for testing is placed, a quasi-uniform field. Moreover, the method operates over a broad frequency range with high accuracy. I.
In this paper novel compression techniques are developed for portable heart-monitoring equipment ... more In this paper novel compression techniques are developed for portable heart-monitoring equipment that could also form the basis for more intelligent diagnostic systems thanks to the way the compression algorithms depend on signal classification. There are two main categories of compression which are employed for electrocardiogram signals: lossless and lossy. Design of an optimal Wiener filter is implemented to remove noise from a signal, considering that the signal is statistically stationary and the noise is a stationary random process that is statistically independent of the signal. Two programs for compression and Wiener optimal filtering are realised in MATLAB.
Modified Langendorff experimental device for rat heart decellularization with a vibrating fluid column
2020 International Symposium on Electronics and Telecommunications (ISETC)
In the present paper we propose the design and realization of an experimental device of Langendor... more In the present paper we propose the design and realization of an experimental device of Langendorff type, controlled in pressure and with the vibrating column of fluid, used for decellularization of the rat heart with a surfactant solution of sodium dodecyl sulfate (SDS). The experimental device consists of two constructive parts: a hydraulic-electronic part that ensures constant pressure for retrograde heart perfusion and an electromagnetic assembly that induces the vibration of the liquid column in the immediate vicinity of the device cannula with a frequency of 15 Hz. The decellularization solution is recirculated during the experiment, so that by serial spectrophotometric determinations of the concentration of deoxyribonucleic acid (DNA) and proteins in this solution can determine the kinetics of decellularization and the moment when it is completed.
Software Validation For Automatic Heart Decellularization
2021 16th International Conference on Engineering of Modern Electric Systems (EMES), 2021
In this paper, we propose a software application for validating the automated decellularization p... more In this paper, we propose a software application for validating the automated decellularization process for a rat heart. This pilot study implemented a latex balloon that simulates a heart in which initially we introduced dye, using a syringe pump for clinical use. Then we pumped water with a controlled flow, so finally, we replaced this dye with injected water. With this design, we can validate the software application because it automatically detects the moment when the simulated heart completely discolored, and turned off the entire system, which is equivalent to total real heart decellularization. During this process, photos were automatically taken at a certain interval, selected by the user. Photos were processed according to the selected area at the beginning of each experiment. The data collected was stored and the evolution of the dye from the simulated heart was plotted. In other words, once validated, this application can be used further in the entire system created specifically for the decellularization of a rat heart. Because decellularization is a generally long process, which currently requires a lot of manual operations and supervision, the main goal in our study is to design an automated system for the entire decellularization process, so that it eliminates collecting samples for the method of ultraviolet spectrophotometry.
Four ways to improve the capabilities of a virtual instrument involving a microcontroller are cov... more Four ways to improve the capabilities of a virtual instrument involving a microcontroller are covered in this paper. They are structural modeling and programming, real-time control, asynchronous communication between the microcontroller and the host PC, and system integration. This paper covers 4 common problems encountered by embedded developers and 5 solutions to the 4 problems. The solutions and examples demonstrated in this article will help readers build robust and reliable virtual instruments for crucial applications.
Abstract:- QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) pr... more Abstract:- QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing and analysis. Large variety of methods have been proposed and used, featuring high percentages of correct detection. Nevertheless, the problem remains open especially with respect to higher detection accuracy in noisy ECGs. LabVIEW ( Laboratory Virtual Instrument Engineering Workbench) is a graphical programming language that uses icons instead of lines of text to create programs. We developed in LabVIEW the filtering for removal of artifacts in biomedical signals and the Pan-Tompkins algorithm. We have investigated problems posed by artifact, noise and interference of various forms in the acquisition and analysis of several biomedical signals. We have also established links between the characteristics of certain epochs in a number of biomedical signals and the corresponding physiological or pathological events in the biomedical systems of concern. Event detection is an importan...
Multiple Convolutional Neural Networks for Diabetic Retinopathy Classification
2021 International Conference on e-Health and Bioengineering (EHB), 2021
Diabetic retinopathy (DR) is a complication of diabetes, caused by high blood sugar levels damagi... more Diabetic retinopathy (DR) is a complication of diabetes, caused by high blood sugar levels damaging the retina blood vessels, and can lead to vision loss if it is not treated or detected in initial phases. Convolutional neural networks (CNNs) were used to classify multiple DR images on different stages for the early diagnosis purposes. Improving the accuracy and precision of examination, developing the classification of cases of diabetic retinopathy by severity are essential steps in treating diabetic retinopathy and other eye diseases.
Extension of a Glycaemic Control Medical Application with New Functions and Ergonomic User Interface Elements
2018 International Symposium on Electronics and Telecommunications (ISETC), 2018
The human body is composed of numerous highly complex metabolic processes. Abnormal variation of ... more The human body is composed of numerous highly complex metabolic processes. Abnormal variation of the blood glucose concentration is a common complication in the intensive care units. This paper presents a model-based method of glycaemic control and a medical application implementing the glycaemic control protocol. The principal cases were to extend the functionality of the application in order to automatically create multiple episodes for a patient already in the database of the application and an accessibly view for previous treatments calculation. These functions are very helpful and convenient because allow to the clinicians to have new measurements and a treatment calculation without entering the data of the patient again in the system. The visualization of previous treatments can be efficiently used to define optimized dosing for the subsequent treatment period. The paper concludes with the results of the extension of the medical application.
QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing an... more QRS and ventricular beat detection is a basic procedure for electrocardiogram (ECG) processing and analysis. Large variety of methods have been proposed and used, featuring high percentages of corr...
Tumor Detection and Classification of MRI Brain Image using Different Wavelet Transforms and Support Vector Machines
2019 42nd International Conference on Telecommunications and Signal Processing (TSP), 2019
The brain is one of the most complex organs in the human body that works with billions of cells. ... more The brain is one of the most complex organs in the human body that works with billions of cells. A cerebral tumor occurs when there is an uncontrolled division of cells that form an abnormal group of cells around or within the brain. This cell group can affect the normal functioning of brain activity and can destroy healthy cells. Brain tumors are classified as benign or low-grade (grade 1 and 2) and malignant tumors or high-grade (grade 3 and 4). The proposed methodology aims to differentiate between normal brain and tumor brain (benign or malign). The study of some types of brain tumors such as metastatic bronchogenic carcinoma tumors, glioblastoma and sarcoma are performed using brain magnetic resonance imaging (MRI). The detection and classification of MRI brain tumors are implemented using different wavelet transforms and support vector machines. Accurate and automated classification of MRI brain images is extremely important for medical analysis and interpretation.
Environmental Engineering and Management Journal, 2010
This paper introduces the first station in Romania (Eastern Europe) outfitted for systematic moni... more This paper introduces the first station in Romania (Eastern Europe) outfitted for systematic monitoring of solar irradiance on tilted surfaces. The resulted database is in many aspects unique for Romania, allowing for the first time to derive specific parameters like diffuse fraction or sunshine number. Also for the first time, the data collected on tilted surfaces can be used to test models reported in literature and to recommend the most fitting for the region, as is detailed in the paper.
Results of studying the degradation of the silicon solar cells subjected to irradiation with prot... more Results of studying the degradation of the silicon solar cells subjected to irradiation with protons are reported. The macroscopic properties of the cells, such as current-voltage characteristics, serial/parallel resistances, fill factor and efficiency, are examined before and after irradiation. Proton irradiation was performed at the Tandem Accelerator of IFIN-HH, Bucharest. The solar cells were characterized under standard AM0 solar flux at the PV Lab of the West University of Timisoara. The results show that the proton irradiation changes the overall properties of the solar cell, causing a considerable degradation of its performances.
The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learni... more The paper describes aspects regarding an E-learning approach of resonant ac inverters. The learning process is based on "Learning by Doing" paradigm supported by several learning tools: electronic course materials, interactive simulation, laboratory plants and real experiments accessed by Web Publishing Tools under LabVIEW. Built on LabVIEW and accompanied by a robust, flexible and versatile hardware, the experiment allows a comprehensive study by remote controlling and performing real measurements on the inverters. The study is offered in a gradual manner, according to the Leonardo da Vinci project EDIPE (E-learning Distance Interactive Practical Education) philosophy: theoretical aspects followed by simulations, while in the end the real experiments are investigated. Studying and experimenting access is opened for 24 hours a day, 7 days a week under the Moodle booking system.
In the present paper we are interested in compression and noise removal as a preprocessor for the... more In the present paper we are interested in compression and noise removal as a preprocessor for the identification of microcalcification clusters in mammograms. LabVIEW (Laboratory Virtual Instrument Engineering Workbench) is a graphical programming language that uses icons instead of lines of text to create programs. We propose a general strategy for constructing algorithms and implementing them in LabVIEW for compression, noise removal and extracting microcalcification clusters. The comparison method presented in this paper aims to improve mammogram comparison by estimating the underlying geometric transformation for any mammogram sequence. It takes into consideration the various temporal changes that may occur between successive scans of the same woman and is designed too overcome the inconsistencies of mammogram image formation.
2014 IEEE Frontiers in Education Conference (FIE) Proceedings, 2014
This paper presents the implementation of a Virtual Instrumentation (VI) based system which is us... more This paper presents the implementation of a Virtual Instrumentation (VI) based system which is used for remote monitoring of biogas production activities. The proposed measurement approach was designed and is used by students during Measurement and Instrumentation lectures. It combines hardware and software knowledge while allowing the users to interact with a domain of great interest-biogas production. The software component was developed using National Instruments' LabVIEW while dedicated gas sensors have been employed for gas concentration monitoring. The application can be used via mobile devices since it includes a Data Dashboard (DD) interface. This feature has been considered since the proliferation of remote monitoring, with the help of mobile tools, has earned a great interest in the last years. Of course, by using a computer with Internet connectivity, the students are able to connect to the measurement front panel and operate the proposed experiments. Testing of experimental results has been performed with dedicated stand alone instruments. Consequently, the students have the possibility of discussing important VI aspects compared against classic methodologies impacting the test and measurement of biogas production emissions.
Proceedings of the 6th International Conference on Optimization of Electrical and Electronic Equipments
The paper peflotms an analysis of the series resonant converter using a general averaged model. A... more The paper peflotms an analysis of the series resonant converter using a general averaged model. A nonlinear time invariant large signal averaged model describing the large signal behaviour of the converter is obtained in a closed form which can easily be embedded in a computer program. The model is general in the sense that it can be used for converters
2008 11th International Conference on Optimization of Electrical and Electronic Equipment, 2008
The measurement of shielding effectiveness of coaxial cables is often limited by the dynamic rang... more The measurement of shielding effectiveness of coaxial cables is often limited by the dynamic range of the measurement system. This paper presents a new test procedure for measuring the shielding effectiveness (SE) of shielded coaxial cables. The TEH modified measurement cell with an asymmetrically placed conductor and the proposed form of the cell establish in the zone, where the cable for testing is placed, a quasi-uniform field. Moreover, the method operates over a broad frequency range with high accuracy. I.
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Papers by Mihaela Lascu