Valentin Dan Zaharia | Universitatea Tehnica Cluj Napoca (original) (raw)

Papers by Valentin Dan Zaharia

IFMBE Proceedings, 2014

The aim of this paper is to present the modeling results obtained when a liquid flows through a t... more The aim of this paper is to present the modeling results obtained when a liquid flows through a tubular device which contains a solid soluble substance isolated from the fluid flux by a porous membrane. For monitoring the delivery process, a capacitor was built in the protective layer of the tubular structure, the variation of concentrations being revealed by electrical relative permittivity change. The presented device can be easily adaptable to various fields of applications used in medicine, engineering, chemistry, biology, food processing and in water supply systems.

IFMBE Proceedings, 2014

Designing precise and efficient interfacing methods for visually impaired individuals has been a ... more Designing precise and efficient interfacing methods for visually impaired individuals has been a concern of various research groups for decades. Over time, multiple concepts have been designed and presented, each of them introducing different detection and warning methods. This paper presents an upgrade for the classic long cane used by the visually impaired. The design will provide the user with additional information about the surrounding environment, thus increasing the user's awareness and safety level. The module will be able to detect obstacles 4 meters in front of the user at lover body level and 2 meters at upper body level with the help of ultrasonic sensors. Another feature of the device is to signal the user's presence and intentions by powering up an array of LEDs in low light environments or when the cane is positioned parralel to the ground.

2014 International Conference on Applied and Theoretical Electricity (ICATE), 2014

This paper approaches the electromagnetic design and finite-element analysis of an axial-flux per... more This paper approaches the electromagnetic design and finite-element analysis of an axial-flux permanent-magnet (AFPM) synchronous generator for small-scale wind turbines. The study is conducted to find a good-performance and costeffective electric generator topology for micro-wind power application. The proposed double-sided two-stators-one-rotor AFPM synchronous generator with non-overlapping concentrated slotless-stator-winding and ironless PM-rotor disk could be the machine of choice in grid-connected or stand-alone small-scale wind energy conversion systems.

2nd IFAC Workshop on Convergence of Information Technologies and Control Methods with Power Systems, 2013, 2013

Abstract The article approaches the issue of small and medium sized electric motors. This is part... more Abstract The article approaches the issue of small and medium sized electric motors. This is part of an extended study, which contains an algorithm for computing all the statistical and reliability indicators used in the design and analysis of electric motors and also the general system which include these types of motors. The general system is composed by a photovoltaic panel for power supplying, the charger and the battery module, the control module and the motor part of the system. The present paper emphasizes the FMEA analysis, considering the usual faults which might occur in the running of the mentioned electric motors. Thus, the influences of constructive elements of a motor on its reliability are computed (mode percentage); the prediction of the number of occurrences of a fault during the maximal running period of a motor, the analysis of risk level for small and medium electric motors and determining critical values for the motor's elements (mode criticality).

Efficient parameter monitoring and real-time medical data acquisition and presentation can prove ... more Efficient parameter monitoring and real-time medical data acquisition and presentation can prove to be crucial, especially in a medical unit treating patients with severe affections and highly unstable conditions. This paper proposes a monitoring system for the vital parameters of patients hospitalized in a Intensive Care Unit based on the OPC architecture.

An artificial system of tracking must acquire information about the environment exterior to it an... more An artificial system of tracking must acquire information about the environment exterior to it and to use them in order to establish a relationship between it and the objects in the respective area. So, in the surveillance system where the use of video cameras for tracking is needed for the objects in movement, the stereo vision gives the advantage of obtaining some important pieces of information regarding the area of interest. This work presents a low cost system of tracking 2D, in real time, an object by using stereo vision techniques. The application is made in the LabVIEW programming language (National Instruments) and proposes algorithms for the detection, tracking and 3D depth estimation of one object in movement within the surveillance area.

The data acquisition process has the role of transposing physical phenomena from the real world i... more The data acquisition process has the role of transposing physical phenomena from the real world into analogue and digital electrical signal for further processing, analysis and storage of the measurement data. This paper proposes a data acquisition system based on a Programmable Logic Controller (PLC) for voltage and current monitoring in a DC circuit. Two interfacing methods are presented. The first method consists of interfacing the system by means of a specialized graphical terminal. The second method is realized by connecting the system to a PC terminal trough the serial RS-232 interface.

− Multi-touch devices and their applications are one of the newest trends in human interaction re... more − Multi-touch devices and their applications are one of the newest trends in human interaction research. While this approach has been envisioned more than 20 years ago, advances in computational power and display resolution have allowed the implementation of impressive hardware devices with virtually unlimited tracking capabilities. A large number of eye-catching applications have been implemented around the world but there is a clear need for practical engineering applications in order to allow this technology to become appealing even for industrial and academic purposes. This paper tries to address this issue by proposing a complete hardware and software solution for multi-touch multi-user data visualisation. A new interface for analysing measurement data as well as manipulating virtual instruments has been created in the belief that it will help students and researchers alike.

XIX IMEKO World …, Jan 1, 2009

Multi-touch devices and their applications are one of the newest trends in human interaction rese... more Multi-touch devices and their applications are one of the newest trends in human interaction research. While this approach has been envisioned more than 20 years ago, advances in computational power and display resolution have allowed the implementation of impressive hardware devices with virtually unlimited tracking capabilities. A large number of eye-catching applications have been implemented around the world but there is a clear need for practical engineering applications in order to allow this technology to become appealing even for industrial and academic purposes. This paper tries to address this issue by proposing a complete hardware and software solution for multi-touch multi-user data visualisation. A new interface for analysing measurement data as well as manipulating virtual instruments has been created in the belief that it will help students and researchers alike.

Designing precise and efficient interfacing methods for visually impaired individuals has been a ... more Designing precise and efficient interfacing methods for visually impaired individuals has been a concern of various research groups for decades. Over time, multiple concepts have been designed and presented, each of them introducing different detection and warning methods. This paper presents an upgrade for the classic long cane used by the visually impaired.
The design will provide the user with additional information about the surrounding environment, thus increasing the user’s awareness and safety level. The module will be able to detect obstacles 4 meters in front of the user at lover body level and 2 meters at upper body level with the help of ultrasonic sensors. Another feature of the device is to signal the user’s presence and intentions by powering up an array of LEDs in low light environments or when the cane is positioned parallel to the ground.

Electric power measuring and management is a major issue in the current agenda of the electrical ... more Electric power measuring and management is a major issue in the current agenda of the electrical research community. In order to realize a real-time data acquisition system for monitoring electrical parameters in a wide-spread process, special hardware and software equipments have to be used. This paper proposes an experimental data acquisition system based on a Programmable Logic Controller (PLC), connected to a monitoring station via a pair of OPC Server/Client applications. The data collected are presented in real-time via an customized HMI application, and is also stored in a database for further calculations and analysis.

Extensive static and dynamic foot problems in modern society are a direct consequence of the life... more Extensive static and dynamic foot problems in modern society are a direct consequence of the lifestyle of the individual. Continuous use of transportation, prolonged periods of physical inactivity and obesity modify the normal structure of the foot in time leading to traumatic disorders. Correctly assessing the plantar pressure and identifying potential problems due to the unbalance of the foot structure are key factors in preventing and treating of conditions such as flat feet, high arches, bunions, hammertoes, plantar fasciitis etc. The research leading to this paper addresses these issues and a low cost computer aided optical podoscope is presented. With the use of modern computational systems, patient information can be analyzed, stored and compared and visual pressure points can be linked to accurate measurements when body mass and touch areas are known. By combining different illumination techniques the effects of the environment lighting are diminished and the images of the foot interaction with the sensitive surface increase in resolution. Moreover, the pressure information can be separated or connected to the rest of the foot allowing for better visual identification of the static and dynamic foot problems.

Acta Electrotehnica, Volume 42, Nr. 3, 1/10/2011, Cluj-Napoca, Romanania, Mediamira Science Publishing, ISSN 1841-3323

The data acquisition process has the role of transposing physical phenomena from the real world i... more The data acquisition process has the role of transposing physical phenomena from the real world into analogue and
digital electrical signal for further processing, analysis and storage of the measurement data. This paper proposes a data
acquisition system based on a Programmable Logic Controller (PLC) for voltage and current monitoring in an DC circuit. Two
interfacing methods are presented. The first method consists of interfacing the system by means of a specialized graphical terminal.
The second method is realized by connecting the system to a PC terminal trough the serial RS-232 interface.

Acta Electrotehnica Special Issue, Volume 43, Number 5 ISSN 1841-3323, 5th International Conference on Modern Power Systems MPS 2013, 28-31 May 2013, Cluj-Napoca, Romania, pp. 233-236

IFMBE Proceedings, 2014

2014 International Conference on Applied and Theoretical Electricity (ICATE), 2014

2nd IFAC Workshop on Convergence of Information Technologies and Control Methods with Power Systems, 2013, 2013

XIX IMEKO World …, Jan 1, 2009

Designing precise and efficient interfacing methods for visually impaired individuals has been a ... more Designing precise and efficient interfacing methods for visually impaired individuals has been a concern of various research groups for decades. Over time, multiple concepts have been designed and presented, each of them introducing different detection and warning methods. This paper presents an upgrade for the classic long cane used by the visually impaired.
The design will provide the user with additional information about the surrounding environment, thus increasing the user’s awareness and safety level. The module will be able to detect obstacles 4 meters in front of the user at lover body level and 2 meters at upper body level with the help of ultrasonic sensors. Another feature of the device is to signal the user’s presence and intentions by powering up an array of LEDs in low light environments or when the cane is positioned parallel to the ground.

Acta Electrotehnica, Volume 42, Nr. 3, 1/10/2011, Cluj-Napoca, Romanania, Mediamira Science Publishing, ISSN 1841-3323

The data acquisition process has the role of transposing physical phenomena from the real world i... more The data acquisition process has the role of transposing physical phenomena from the real world into analogue and
digital electrical signal for further processing, analysis and storage of the measurement data. This paper proposes a data
acquisition system based on a Programmable Logic Controller (PLC) for voltage and current monitoring in an DC circuit. Two
interfacing methods are presented. The first method consists of interfacing the system by means of a specialized graphical terminal.
The second method is realized by connecting the system to a PC terminal trough the serial RS-232 interface.

Acta Electrotehnica Special Issue, Volume 43, Number 5 ISSN 1841-3323, 5th International Conference on Modern Power Systems MPS 2013, 28-31 May 2013, Cluj-Napoca, Romania, pp. 233-236