Vol 4, No 1. (2017)

Published December 19, 2017

##issue.tableOfContents##


Articles

Directional ratio: a proposed new variable of dynamic balance regai
1-4.

The use of a free oscillating platform for balance training is widespread. However, there is a lack of variables used when analyzing these measurement results. The aim of this study was to introduce and evaluate a new variable. The directional ratio is the ratio of total length of oscillation travelled in the direction parallel and perpendicula...r to perturbation, respectively. 21 adult figure skaters (m. age 28) participated in balance regain tests, adopting two-legged and one-legged stances on each leg on the PosturoMed platform (Haider Bioswing, Weiden, Germany) with a medial-lateral perturbation. Overall the directional ratio showed weak correlation with the damping ratio (r = -0.05) and the time of balance regain (r = -0.08),
suggesting new information content. One-legged stances had significantly lower damping ratio (p = 0.013) and directional ratio values (p < 0.00), showing more anterior-posterior movement and elliptical trajectories. Using the damping and directional ratios together, balance regain can be better
characterized in the future.

Show full abstract
55
56
Reconstruction of human thorax from CT images
1-8.

3D printing, as a rapid prototyping method is become more common nowadays world widely, including medicine too. The purpose of this article is to reveal the potential of using 3D printing in medicine, especially with a specific example of making a human thorax model from the very beginning of imaging diagnose to the physical model. There will b...e shown in details how the model of bones, lungs and heart had been created. The circumstances of the 3D printing will be discussed too.

Show full abstract
13
11
Implementation of Adaptive Neural Networks Controller for NXT SCARA Robot System
1-8.

Several neural network controllers for robotic manipulators have been developed during the last decades due to their capability to learn the dynamic properties and the improvements in the global stability of the system. In this paper, an adaptive neural controller has been designed with self learning to resolve the problems caused by using a cl...assical controller. A comparison between the improved unsupervised adaptive neural network controller and the P controller for the NXT SCARA robot system is done, and the result shows the improvement of the self learning controller to track the determined trajectory of robotic automated controllers with uncertainties. Implementation and practical results were designed to guarantee online real-time.

Show full abstract
21
13
Internet based light quality measurement
1-5.

The goal of this project was to implement a device, which can measure the illuminance and the correlated color temperature (CCT) of a light source and also works as a webserver. The analyzation of light sources is very important in our everyday life. With the use of a webserver the measured values are easily accessible and the calculation metho...ds can be changed without any changes on the hardware. It also provides a solution to store and analyze the results without further human interaction. Therefore the device is capable of collecting and analyzing a large amount of data. For these criterions we chose a PIC microcontroller, an Ethernet chip and two different sensors. One of the sensors is an RGB sensor and the other one is a LUX sensor. Both of the sensors are using photodiodes to sense the different attributions of a light source. Through this article we show the basic theory behind the project, the implementation and calibration of the device; then the results of the measurements and finally we mention some possibilities for future improvements.

Show full abstract
17
9
LabView-based Simulator for PV Modules Energy Efficiency Optimization
1-6.

Due to the rapid depletion of traditional fossil energy resources the optimal utilization of renewable resources such as the solar energy becomes a leading task in power engineering. In recent years photovoltaic energy-linked technologies has reached major advances in order to achieve improved energy efficiency conversion rates. In this endeavo...r, a huge amount of high quality research effort is dedicated worldwide. This paper is focused to present the design and implementation steps of a LabView -based toolkit aimed to modeling and simulates solar photovoltaic (PV) cells in a wide range of operation conditions. By using its well known mathematical model, it has been conceived a versatile and user-friendly simulator well suitable to study and evaluate energy efficiency conversion processes. In order to maximize the energy conversion efficiency the maximum power point tracking (MPPT) algorithm has been implemented. The virtual instrument (VI) developed in the graphical programming language allows fast and convenient monitoring of PV cell output magnitudes and plots the I-U and P-U diagrams under different operation conditions. These curves have been compared then with the diagrams provided by the PV module manufacturer. The obtained results are in good agreement with the manufacturer’s catalogue data.

Show full abstract
22
3
Mechatronic Systems for Caregivers Support on the Context of Bedridden People Care: Solutions to better life
1-6.

With the increasing number of aged people, especially in developed countries, Wellbeing solutions have became an important subject to be explored and developed. Currently, as specialized Institutions in geriatric care cannot cope with the increasing requests for support of quality of life, patients have to remain at their homes having as caregi...ver the other member of the couple or a member of close family. A solution for supporting the caregiver, during assisting the bedridden person with some basic tasks as eating, taking a bath and/or hygiene care is of utmost importance. This paper presents an overview for supporting the caregiver on providing the basic needs for bedridden persons. From safety needs to repositioning and hygiene care of bedridden persons are taken into account, by developing specific mechatronic devices for supporting and helping caregivers on those tasks. The proposed mechatronic systems must, ideally, reduce the number of caregivers and the amount of spent and needed effort.

Show full abstract
20
11
Research regarding electro-oculogram based Human Computer Interface (HCI)
1-7.

In this article an electro-oculogram (EOG) based Human Computer Interface (HCI) will be presented, in order to control the mouse cursor on the screen of a computer or laptop. Electromyography (EMG) is the domain that employs the activation and deactivation (onset and cessation) of the muscles. EOG is the sub-domain of EMG field that focuses on ...the human eye’s movements. The EOG bio-signals can be recorded using Ag/AgCl electrodes coupled on the user’s skin and fed into a data acquisition device - an analog-to-digital converter (ADC) in order to be transmitted, filtered and processed on a computer or laptop. We acquired the EOG bio-signals with a 24-bit, 4 channel, 51200 samples/s per channel ADC, made by the National Instruments (N.I.), model NI-9234 industrial ADC, using only 3 recording channels and electrodes. After processing, the program running on the computer or laptop can be used to realize commands or control different applications according to the recorded bio-signals. In our case, this was done, using Artificial Neural Network (ANN) toolbox of MATLAB®. This HCI can be used by perfectly healthy or even by disabled people. In the case of disabled people, these systems can be used to control any electronic device connected to the computer or control the device itself. Applications of this type of HCIs can be Internet browsing, mail writing, word file editing, etc. This system is meant to offer a new way of computer control - other than the existing standard communication and/or control possibilities (like keyboard and/or mouse).

Show full abstract
15
11
Speed Sensorless Control of Six-Phase Asynchronous Motor Drive
1-9.

Multi -phase ac motor drives are nowadays considered for various applications, due to many advantages that they offer when compared to three-phase motors. Cancellation of mechanical position or speed sensors at the motor shaft have the attractions for adjustable speed drives of induction motor to reduce the cost and increase the reliability. To... replace the sensor, information of the rotor speed is extracted from measured stator currents and voltages at motor terminals. This paper investigates speed estimation method using model reference adaptive system (MRAS) to improve the performance of a sensorless vector controller of six-phase induction motor (IM). In the proposed method, the stator current is used as the state variable to estimate the speed. Since the stator current error is represented as a function of the first degree for the error value in the speed estimation, the proposed method provides fast speed estimation and is also, more robust to variations in the stator resistance, compared with other MRAS methods. Consequently, this method can improve the performance of a sensorless vector controller in a low speed region and at zero-speed. The proposed method is verified by simulation using the Matlab/Simulink package. The performance of the proposed system is investigated at different operating conditions. The proposed controller is robust and
suitable for high performance six-phase induction motor drives. Simulation results validate the proposed approaches.

Show full abstract
16
13
New cognitive info-communication channels for human-machine interaction
1-9.

The main goal of this paper is to discuss a new paradigm for robot teaching and supervising which is based on cognitive info-communication channels for human-machine interaction. According to the studied concept the robot is considered as an unskilled worker “who” (which) is strong and capable for precise manufacturing. “He” (it) has a ...special kind of intelligence, but “he” is handicapped in some senses, that is why “he” needs special treatment. We must command “him” clearly in a special way and we must supervise “his” work. If we can elaborate a proper way for communicating with this “new worker”, as an additional dimension of robotization, we can get a capable new “colleague”. The ultimate goal is to help the boss to be able to give the daily task to a robot in a similar way as he/she able to give the jobs to the human workers. For example, by providing the CAD documentation with some additional verbal explanation.

Show full abstract
50
22
View All Issues