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In the last years, the research in the gas sensor field had a significant upward thrust. Regarding the chemoresistive gas sensors, this has produced a remarkable study of metal oxides semiconductors which, however, have shown different limits. In particular their low selectivity and lack of stability take them to an unreliable responses over time. For this reason, in this work it was decided to study...
In this work we present the growth of both onedimensional (1D) and two-dimensional (2D) zinc oxide (ZnO) nanostructures. The thickness (diameter in the case of nanowires) was varied by changing the growth parameters. ZnO nanowires with an average diameter of 80 – 250 nm and nanosheets with an average thickness of 70 – 360 nm were obtained. Both kinds of nanostructure have been used as conductometric...
For future low-priced electronics, high performance thin film transistors (TFTs) are highly desirable. One possible way towards device optimization is the downscaling of the channel length (L) which allows higher device density, smaller device configuration and better performance. In this paper, we present a simulation study of bottom gate TFTs based on ZnO as semiconductor, SiO2 as insulator layer...
Model-driven engineering is constantly gaining importance, expanding to domains varying from the Web to the 3D graphics. Domain-specific languages besides contributing to the development process can be used in a didactic process conducted not only in schools. Thus this paper introduces new domain-specific language and discusses its usage in teaching construction of shaders and materials while working...
Public auditing has vital significance in cloud computing. However, current public auditing schemes are bilinear map based, and they are costly. This paper brings out an XOR based public auditing scheme, which is much more efficient than current bilinear map based schemes.
In this paper, we present a method of acquiring / utilizing the study records using smartphone for improving the students learning motivation for learning. During the lecture, the students use the smartphone for learning. The results showed that the proposed study record system has a good effect for improving students' motivation for learning. For the professors of the university, it is difficult...
This paper describes the designing of a highly efficient and compact micro-strip patch array antenna for wireless communication.The antenna array is designed to transmit at 2.4 GHz frequency (ISM band). The main contribution of the paper is the integration of meta-materials with a ‘U-shape’ slotted rectangular micro-strip patch antenna, in order to achieve high gain and enhance the beam directivity...
This study presents experimental results on the variation of dielectric constant, electrical conductivity, attenuation and loss tangent of five different soil samples at three different MHz frequencies. The most important parameters needed for Ground Penetration Radar study are dielectric constant and electrical conductivity of various soil samples. Such type of studies may find very useful for designing...
We present a therapeutic application of a microfabricated implantable and resorbable medical device made out of fully degradable materials by demonstrating in vivo elimination of bacterial infection by wireless activation of the device after implantation. The device disappears upon its completion, requiring no retrieval.
There have been increasing demands for stretchable and highly sensitive sensors for use in structural health monitoring, human motion capturing, sport performance monitoring and rehabilitation. Such high performance myoelectric sensors are also remarkably important in developing artificial limbs where a combination of robotic actuators and sensory systems are required to provide lifelike, affordable,...
This work presents a study on the quality factor (Q-factor) of the passively temperature compensated CMOS-MEMS resonators through the collected material/experimental database and finite-element (FEM) simulation. By adapting an anchor-loss-free double-ended tuning fork (DETF) resonator design, the intrinsic material loss is expected to be the major loss mechanism in CMOS-MEMS resonators that limits...
Since 2011, we have been educating mentor teachers at Obuda University Trefort Agoston Centre for Engineering Education - OU TACEE. Mentor teachers can support the preparation process of our engineering teacher students in secondary vocational schools by coaching their teaching practice. I am responsible for teaching six subjects. In the first semester I gave examples on how to create good presentations...
Training for mentor teachers has been from 2011 at Obuda University Trefort Agoston Centre for Engineering Education - OU TACEE. Mentor teachers can support the preparation process of our engineering teacher students in secondary vocational schools by coaching their teaching practice. We recognized that data collection and processing was important for Mentor teachers in their work. Therefore, we involved...
The aim of this work is to analyze inclusions of samples from selected materials using metrotomography. The main part of the problem was correct methodology of software processing of the measured data acquired by computed tomography equipment Carl Zeiss METROTOM1500. For various settings of the input parameters was investigated expected output data to a known set of defects. Comparison of the effects...
In this paper, we propose a quality metric for video transmitted over HTTP adaptive streaming (HAS). Perceived video quality in HAS strongly depends on the employed rate adaptation mechanisms, transmission conditions and buffer filling levels. Predicting perceived quality in HAS is an open problem, due to the lack of appropriateness of existing metrics. To overcome this problem, a quality metric based...
A topic of interest related to titanium alloy Ti-6Al-4V implants is optional surface treatment. In many cases surface treatment is used for bioactivation of the implant and thereby improvement of its biocompatibility and osseointegration. An important factor of surface properties in the context of applying coatings is its roughness. This paper discusses the design of test samples (plates). It is aimed...
In recent years, non-stationary, non-invasive imaging methodologies demonstrated as reliable, quantitative, remote characterization and evaluation methods for characterization of biological samples. This present work incorporates a digitized frequency modulated thermal wave imaging (DFMTWI) followed by time domain analysis for bone diagnostics, especially bone with tissue, skin and muscle over layers...
This contribution demonstrates an application of non-stationary frequency modulated thermal wave imaging technique for the numerical characterization of a mild steel sample containing random shape defects. Frequency and time domain based phase analysis schemes are implemented on the recorded thermal profiles and their detectabilities are compared by taking signal to noise ratio into consideration.
Active thermographic studies using non stationary coded thermal wave imaging methods facilitate deeper sub surface analysis with better depth resolution even with relatively low peak powers. They exhibit a variation in detection capability due to their diversity in shape and frequency content etc., In order to compare the ability of these schemes in spite of their diversity, a common feature based...
Virtualizing the educational contents and resources as well as conceptual entities would form VOs and CVOs for WoO paltform. which provides dynamicity and intelligence through composition and collaboration for self-directed learning in smart learning environment. Semantic ontology in WoO platform supports dynamic composition and collaboration among objects, VO and CVO, for intelligent learning model...
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