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Previously negative differential conductivity caused by Bloch oscillations of electrons was demonstrated in SiC natural superlattice for bipolar n++ — π — n+ structures at T=300 K. Here we investigate THz emission and electrical characteristics of the similar structures at 7 K and show common nature of both phenomena (the THz emission and the negative differential conductivity) caused by the Bloch...
The nonlinear process of cross polarized wave (XPW) generation, which has been broadly used for temporal contrast enhancement and spectral broadening [1, 2], continue to attract interest in different application schemes. A feature of space-time focusing (STF), which occurs at the focus of spatially dispersed beam, is to deliver highly localized intensity at the focus without incurring high non-linear...
DC circuits such as battery storage systems bear an inherent risk of fire through electric arc faults. This paper reveals how different system parameters are linked to the arc fault risk and which of them are useful for detection. Furthermore, a hardware-based arc fault simulator for various DC systems is introduced.
Finger-Augmented Devices (FAD) identify a particular wearable technology suitable to turn the human fingers into enhanced sensing surfaces for advanced human-computer interfaces. The feasibility of a full on-body UHF RFID-based FAD is here investigated for the first time. The system is aimed at providing impaired people suffering from a lack of thermal feeling, due to pathological disorders, with...
Direct functionalization strategy has been employed to modify the surface of the magnetic hollow spheres with (3-Aminopropyl)triethoxysilane (APTES) for targeted drug delivery. Magnetic hollow spheres were characterized by XRD, BET, FE-SEM, VSM and FT-IR. Model drug camptothecin (CPT) has been used to evaluate drug loading and in vitro release.
Bonded NdFeB magnets were fabricated by an additive manufacturing (AM) technique known as selective laser sintering (SLS). A mixture of spherical isotropic powders of a NdFeB based alloy and polymeric binder (PA 12) was used as process feedstock. The amount of binder used was varied to optimize mechanical resistance and magnetic properties. Besides that, two parameters were evaluated: layer thickness...
Performance enhancement is critical for offering competitive CMOS solutions for advanced technology nodes. To fully leverage performance enhancement elements the device reliability impact needs to be comprehended on the CMOS circuits like SRAM and ring-oscillators. We reaffirm that time-zero and BTI induced stochastic variation are most critical for SRAM circuits while for logic circuits such as ring-oscillators...
In this paper, we present a model to detect and distinguish individual musical instrument using different feature schemes. The proposed method considers ten musical instruments. The feature extraction scheme consists of temporal, spectral, cepstral and wavelet features. We developed k-nearest neighbor model and support vector machine model to test the performance of system. Our system achieves the...
In a power system network, the system power needs are met by all the generating stations working in coordination. When there are many power generating units, a lot many operating strategies are possible to meet the time based varying power demand. In this paper, an optimization study is carried out to checkout the cost effectiveness of using a deloaded photovoltaic (PV) instead of battery. The three...
Apart from the actual signal content, a digital audio recording has various artifacts and distortions due to multiple reflection of sound and other activities in the environment which produce background noise. One such parameter which results in artifacts in the audio recording is the acoustic reverberation. This reverberation depends on the room geometry. This paper describes a methodology to extract...
Expendable Launch Vehicles are designed with a single mission perspective. Reusable Launch Vehicle design aims for reusability and maintainability for multiple missions. Power system of such missions has features that are distinctive from operational launch vehicles like PSLV & GSLV. The instrumentation, Navigation Guidance & Control, pyro and actuation system power are derived from Li ion...
This paper is devoted to the collective control and group navigation based on hydroacoustic communication intended for marine autonomous robotic complex (MARC) including autonomous underwater vehicle (AUV) and autonomous surface vehicle (ASV). The structures of control and navigation systems are considered and some results of the systems operation in the real marine environment are supplemented. The...
Spectrum sharing using licensed shared access is one method of spectrum usage to be more optimal and efficient. In this paper we propose techno economic approach to know investment value and economic feasibility of using spectrum sharing at radar 2700–2900MHz band. Coverage area of spectrum sharing decided about 15km outside radar coverage at Soekarno Hatta international airport. By spectrum sharing,...
In this work, we propose Shrinkage k-means (Sk-means), a novel variant of k-means based on the James-Stein estimator for the mean of a multivariate normal given a single sample point. We evaluate Sk-means on both synthetic and real-world data. The proposed method outperformed standard clustering methods and also the existing method based on k-means which uses the James-Stein estimator. Results also...
When we look at our environment, we primarily pay attention to visually distinctive objects. Saliency maps are topographical maps of the visually salient parts of scenes in which such visually distinctive objects, henceforth called visually important or salient, can be easily highlighted. Computing these maps is still an open problem whose interest is growing in computer vision. Thus, in this work,...
Semi-supervised learning is a challenging topic in machine learning that has attracted much attention in recent years. The availability of huge volumes of data and the work necessary to label all these data are two of the reasons that can explain this interest. Among the various methods for semi-supervised learning, the co-training framework has become popular due to its simple formulation and promising...
The existence of missing data is a common fact in real applications which can significantly affect the data analysis process. In order to overcome this problem, many methods have been proposed in the literature. Extreme Learning Machine (ELM) has become a very popular research topic in machine learning and artificial intelligence areas due to its characteristics such as fast training procedure, good...
Soft landing means to land a spacecraft on a surface by gradually reducing its velocity to within 0–5m/s. In order to land the spacecraft accurately at the desired landing spot the descent velocity of the spacecraft have to be determined. This paper introduces a vision based velocity estimation of a lander during soft-landing on an alien planet or a satellite. The method estimates the velocity by...
Laboratory measurement of the IV parameters of multi-junction (MJ) solar cells is performed using solar simulators designed to match the desired illumination environment as closely as possible. This paper examines the impact of non-idealities in solar simulator spectrum on the measurement of MJ solar cell IV parameter through the use of a multi-zone solar simulator capable of varying light output...
The use of approximate algorithms in aiding heuristic search is explored. Approximate algorithms are coupled with algorithm A to generate an algorithm BFPR which maintains provably good quality of solutions. Experiments were performed with Euclidean Traveling Salesman problem and with the problem of Scheduling Independent Tasks. It is found that the algorithm expands considerably fewer number of nodes...
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