Miracle-dz/UniFAR-FTUs huggingface dataset:
Switching Speed Analysis and Controlled Oscillatory Behavior of a Cr-Doped V2O3 Threshold Switching Device for Memory Selector and Neuromorphic Computing Application

The switching speed of a threshold switching Cr-doped V2O3 device as function of voltage and resistive load is understood by means of a thermal device model. It is found that conditions that result in switching trajectories traveling further from equilibrium result in reduced switching time and energy, providing interesting guidelines for the optimization of the 1S1R memory cell. Secondly, the addition of capacitive loads is investigated. Voltage-controlled oscillatory behavior in the frequency range of 10–30 MHz has been obtained and also properly simulated by our device model. Such nanodevice oscillators are of high interest for new neuromorphic computing paradigms.
Design of a Fully Planar BC-CSRR SIW-based H-plane Sectoral Horn with a Printed Transition

The Broadside Coupled Complementary Split Ring Resonator Substrate Integrated Waveguide (BC-CSRR SIW) is a fully planar platform for the implementation of millimeter-wave components at a minimal fabrication cost. We present here a new design H-plane sectoral horn Antenna based on the BC-CSRR SIW. A transition of parallel plate strips etched on the same substrate is also designed using parametric finite element simulations, in order to improve matching and radiation characteristics. The composite antenna comprising of the BC-CSRR SIW horn and the matching transition exhibits good return loss performance and directive end fire radiation, while the back radiation is kept small.
Reconfigurable BPF with Wide Tuning Bandwidth Range Using Open- and Short-Ended Stubs

In this paper, a reconfigurable bandwidth bandpass filter (BPF) is demonstrated operating at a fixed center frequency of 2.4 GHz. The proposed reconfigurable filter is based on a quadruple-mode square ring resonator loaded with either $\boldsymbol{\lambda}_{\boldsymbol{g}}/4$ open-ended stubs or $\boldsymbol{\lambda}_{\boldsymbol{g}}/2$ short-ended stubs to implement two reconfigurable bandwidth states. Due to symmetrical design, even- and odd-mode analysis is performed and closed form equations are derived to describe the reconfigurable filter behavior. PIN diodes are used to switch from narrowband state to wideband state. In order to suppress the higher order modes and to improve the upper stopband, a pair of parallel coupled lines (PCLs) and a pair of $\boldsymbol{\lambda}_{\boldsymbol{g}}/4$ high impedance short-ended stubs are placed at the input and output ports. To verify the validity of the simulated results, the prototype of the proposed reconfigurable filter was fabricated. The measured results demonstrate a low insertion loss less than 1 dB and a 3-dB fractional bandwidth (FBW) that can be switched from 34% to 75% while the center frequency is kept constant at 2.4 GHz.
DOA Estimation in 4D Linear Arrays With Unidirectional Phase Center Motion Using Sparse Signal Reconstruction

A novel DOA estimation method in 4D arrays with unidirectional phase center motion (UPCM) using sparse signal reconstruction is proposed in this paper. In order to reduce the influence of time modulation on noise as far as possible, a unidirectional phase center motion (UPCM) with one element turned on over a period is used. Moreover, the l1-norm with singular value decomposition (SVD) is used to reduce the computation loads in the sparse signal reconstruction algorithm. An 8-elememnt 4D linear array is used to validate the proposed method. By comparing with other methods, simulation results show that the better performance can be obtained using the proposed method.
Enhancing Memory Bandwidth in a Single Stream Computation with Multiple FPGAs

Stream computing is an area where FPGAs can be suitably utilized to meet high performance and high scalability demands. To achieve these, a deep computing pipeline is implemented on multiple FPGAs where stream computing is performed. This paper presents an approach to utilize two masters in a 1D ring network of multiple FPGAs for a single stream computation. Each master FPGA will be reading and writing to their respective DDR3 memories alternately, while streaming through the slave FPGAs. This is done in order to synchronize the computational results on physically separate memory units. Due to this, the aggregate memory bandwidth is doubled, which suggests enhanced performance. The introduction of this streaming concept lays the groundwork towards full utilization of memories in all the FPGAs, as an identified future work.
Realizing Bipolar Power Semiconductor for Highest Reliable Applications

During the 1970s thyristors were used for the first time to realize a Line Commutated Converter (LCC) for High Voltage Direct Current (HVDC) transmission lines which decreased power losses and increased reliability. At that time thyristors with a blocking capability of 1.65 kV and a silicon diameter of 35 mm had been specially developed for this application. Nearly 43,000 thyristors were installed in this first transmission line using thyristors, Cahora Bassa, to transfer 1920 MW at ± 533 kV over 1420 km from Mozambique to South Africa. Currently there is a trend to realize HVDC transmission lines increasingly with Voltage Source Converters (VSC). This was further stimulated by the introduction of the Modular Multilevel Converter technology (MMC) which decreased system complexity greatly. Today's installations are built up to ±500 kV and 2 GW and for future projects ±800 kV with 5 GW are under discussion. Although the main semiconductor device in VSCs is the IGBT, classical bipolar devices are critical for VSC operation, too. Special developed diodes with extreme soft switching behavior are used as Free Wheeling Diodes (FWD) and antiparallel thyristors protect the IGBTs in case of surge current events. Recently Press Pack IGBT (PPI) has come into focus as an alternative realization for VSC architectures.
Perancangan Problem-Solving Environment Menggunakan Case-Based Reasoning

Problem Solving Environment (PSE) merupakan salah satu komponen yang ada dalam Intelligent Tutoring System (ITS) yang berfungsi untuk mendefenisikan aktivitas pemecahan masalah antara pelajar dengan sistem serta berisi metode yang akan digunakan untuk melakukan pemecahan masalah tersebut. Case-Based Reasoning (CBR) merupakan salah satu metode yang dapat diterapkan dalam PSE, dimana setiap persolaan dan solusi akan direpresentasikan dalam bentuk kasus-kasus. Paper ini berisi tentang perancangan PSE menggunakan CBR serta hasil dan pembahasannya.
Arabic Writer Verification Based on Shape Complexity

Writer recognition task has received a lot of interests during the last decade due to it wide range of applications. This task includes writer identification and/or verification. In this paper we propose an original approach for the Arabic writer verification based on shape complexity. In this approach two handwritten words are submitted to the system, which will proceed to a segmentation to each of them into graphemes. A dedicated segmentation module for Arabic handwriting has been developed for this purpose. All the graphemes generate are then analyzed to select the one who embed the most relevant information about the writer identity in each word. This step is performed through a shape complexity measure that determines the most complex shape (grapheme). The decision, if the two samples have been written by same writer or not is based on the similarity of the two most complex shapes extracted from each word. The approach has been evaluated on dataset of 105 and the obtained results are very promising since we succeed to accept correctly in 80 % of cases when we used the whole dataset and reject correctly in 89% of the cases when we use 20% of the dataset.
A Dual-Band Dual-Circularly Polarized Reflectarray for K/Ka-Band Space Applications

Reflectarrays (RAs) offer not only low-cost and low-profile solutions for point-to-point communications, but they also have a controllable polarization and frequency response. This property of an RA allows to realize polarization-selective and multi-band high-gain apertures. Here, we propose a novel dual-band dual-circularly polarized (CP) RA with a unique set of properties. The RA is composed of a dual-band dual-linearly polarized (LP) RA and a dual-band LP-to-CP polarizer. By dividing the CP-RA into an LP-RA and a polarizer, we obtain the ability to radiate CP shaped beams or pencil beams at desired directions for any of the dual bands and for each polarization, independently. Moreover, the polarizer has a unique property to convert an LP wave to orthogonal CP waves at the two bands. This relaxes the feed complexity and increases the out of band rejection. The underlying unit cell of the proposed RA is designed for 18.2-18.8 GHz and 27.8-28.3 GHz. It provides a 323° phase shift in the lower band and 381° phase shift in the higher band while maintaining a cross polarization level more than 15 dB in both bands, and excellent decoupling between the two bands. An offset-fed RA is designed and full-wave simulation results are presented and confirm the performance of the proposed structure.
Research on Airborne Data Bus Test Method

Due to the advantages of high reliability, low delay, certainty, etc., military 1394B bus is used as the onboard data bus in aircraft such as F-35 and X-47B, which brings a new choice to the aircraft designer bus selection. For system designers, bus testing of onboard systems is critical and complete bus testing will guarantee system communication. This paper carries out related research according to the protocol of 1394B bus. In the test and test, start from the aspects of cable, physical layer, link layer, AS56643 protocol and application layer of military 1394B bus, and propose a wide-scale airborne data bus test method for other airborne data bus test reference.
A Graphical User Interface for Fast Evaluation and Testing of Machine Learning Models Performance

In this paper we propose the design of a graphical tool for fast evaluation of Machine Learning (ML) models performance in classification tasks. The motivation behind this work is to get some intuition on what machine learning model we can use to get the best possible outcome out of our datasets. The designed GUI allows us to decide whether applying data standardization and applying different data dimensionality reduction algorithms based on Principal Component Analysis (PCA). Also, we can choose between 6 generative and discriminative supervised ML classifiers for making the final predictions, including: Logistic Regression, Support Vector Machines, Random Forest, K-nearest Neighbors, Gaussian Naive Bayes and Neural Network (Multilayer Perceptron). Results demonstrate that we are able to effectively apply this set of algorithms to any given dataset that satisfies our system requirements and also visualize the model behavior as well as its performance metrics.
Air-Filled Substrate Integrate Waveguide Antenna Analyzed with Theory of Characteristic Modes

An air-filled Substrate Integrated Waveguide (SIW) Antenna is presented in this paper. The main goal of this work is to design a low profile antenna (0.028 λ0 at the central frequency, 4.51 GHz) with a good bandwidth and unidirectional radiation pattern. To obtain this performance, the antenna is formed by four semi-closed SIW cavities without lateral sidewalls and is excited by means of a capacitive feed. A parametric study, carried out using an incident plane wave and the Theory of Characteristic Modes, has been used to study the behaviour of the semi-closed SIW cavity antenna. Simulated results show a good performance, covering the frequency range 3.37–5.65 GHz with a return loss above 10 dB.
Bollywood Movie Success Prediction using Machine Learning Algorithms

Hindi Film Industry also referred to as Bollywood has now become a multibillion dollar industry and has also surpassed Hollywood in terms of amount of ticket annually sold. With so much money now riding on Bollywood movies it has become imperative to make accurate predictions about success of Bollywood films. Today even if a Bollywood movie does not become a hit at box-office the producer of movie will still make profits through sale of satellite rights and music rights but it is Distributors who suffer losses. Hence it has now become imperative for distributors to purchase distribution rights of movies at reasonable prices such that they can obtain profits from it rather than just break even. This problem is a supervised learning problem and will review regression techniques discussed in the literature for predicting the lifetime net India collections of Bollywood films as well as use classification methods on our Bollywood movie dataset for multiclass classification. An evaluation of all the approaches is proposed in which the accuracy score will be reported.
Design of an Adaptive and Reliable Network on Chip Router Architecture Using FPGA

We propose an adaptive, low cost, reliable and high performance router implemented based on a conventional two stage pipeline. The proposed Adaptive routing operates in adaptive mode as soon as the congestion is detected in network. We employ fault tolerant strategies for different components of routers such as input buffer, route compute unit, virtual channel allocation, switch allocation, and crossbar unit. The proposed router architecture differs from existing reliable routers, our implementation maintains the performance of fault tolerance router under massive network workloads by influencing the features of a crossbar, routing algorithm and router pipeline optimization. Our designed router is highly reliable than current fault receptive routers such as Wang[1], Vicis[2], BulletProof[3], RoCo[4] and Poluri[5]. The average latency is reduced by 0.69% and increased by 2.0% compared to fault tolerant and conventional router.
High-Efficiency Wideband Millimeter-Wave Channel Sounder System

To achieve high-efficiency millimeter-wave channel measurements in outdoor environments, a new wideband single input and single output channel sounder system with rotatable high-gain horn antennas is presented. This system operates at various millimeter wave frequencies of up to 40 GHz with signal bandwidth of 500 MHz. Two GPS disciplined Rubidium (Rb) clocks are utilized for frequency and timing synchronization. Adding an external power amplifier at the transmitter and an external low noise amplifier at the receiver enables long-distance channel measurement. A rapid measurement method is presented to improve data capturing efficiency together with automatic measurement software. Channel measurement campaigns at 27.5 and 39.5 GHz are conducted in an outdoor-to-indoor scenario. Experimental results are finally analyzed.
IXPE Mission System Concept and Development Status

The goal of the Imaging X-Ray Polarimetry Explorer (IXPE) Mission, a NASA Small Explorer (SMEX), is to expand understanding of high-energy astrophysical processes and sources, in support of NASA's first science objective in Astrophysics: “Discover how the universe works. ” Polarization uniquely probes astrophysical anisotropies—ordered magnetic fields, aspheric matter distributions, or general relativistic coupling to black-hole spin—that are not otherwise measurable. Imaging enables the specific properties of extended X-ray sources to be differentiated. IXPE will conduct X-ray imaging polarimetry for multiple categories of cosmic X-ray sources such as neutron stars, stellar-mass black holes, supernova remnants and active galactic nuclei. The Observatory uses a single science operational mode capturing the X-ray data from the targets. The IXPE Observatory consists of spacecraft and payload modules built up in parallel to form the Observatory during system integration and test. The payload includes three X-ray telescopes each consisting of a polarization-sensitive, gas pixel X-ray detector, paired with its corresponding grazing incidence mirror module assembly (MMA). A deployable boom provides the correct separation (focal length) between the detector units (DU) and MMAs. These payload elements are supported by the IXPE spacecraft which is derived from the BCP-small spacecraft architecture. This paper summarizes the IXPE mission science objectives, describes the Observatory implementation concept including the payload and spacecraft elements and summarizes the mission status.
A Pattern Reconfigurable Antenna System Integrated in a Truck Side Mirror

Truck-to-Truck (T2T) communications possess an essential role in the field of vehicular communications and Intelligent Transportation Systems (ITS). The research investigations that are demonstrated in this paper involve the design, the development and the integration of an antenna array system inside a truck side mirror. A novel printed 3-element Electronically Switched Parasitic Array Radiator (ESPAR) antenna is presented, exhibiting pattern reconfigurability at 5.9 GHz (two directive beams, one omni-directional pattern). The measured reflection coefficient results indicate negligible deviations between the three antenna operating modes due to a switched impedance matching network that is embedded in the planar antenna structure. A system of two ESPAR antennas is enabled through a novel diversity scheme. An accurate integration approach of the two antennas in the upper part of the truck side mirror is proposed, implemented and experimentally verified, demonstrating an impedance bandwidth of 6.7% and a satisfactory pattern switching capability (3-4 dB gain increase between states).
Improving Isolation Between Antenna Array Elements Using Lossy Microstrip Resonators

A Quarter-wavelength Lossy microstrip resonator is applied to minimize the mutual coupling between antenna array elements. The proposed lossy resonator is placed between the adjacent E-plane coupled elements in the antenna array to restrict the propagation of surface waves between the antennas of the array. In order to validate the practicability of the proposed structure, a two-element antenna array with half wavelength distance between centers of two patches is designed, fabricated, and measured. The experimental results show a reduction in the mutual coupling of more than 26 dB obtained between elements at the operation frequency of the array.
Tutorial: digital neurocomputing for signal/image processing

The requirements on both the computations and storage for neural networks are extremely demanding. Neural information processing would be practical only when efficient and high-speed computing hardware can be made available. The author reviews several approaches to architecture and implementation of neural networks for signal and image processing. The author discusses direct design of dedicated neural networks implemented by a variety of hardware technologies (e.g. CMOS, CCD), and introduces an indirect design approach based on matrix-based mapping methodology for systolic/wavefront array processor. The array processors mapping technique presented should be applicable to both programmable neurocomputer and dedicated digital or analog neural processing circuits. Several key general-purpose and system-oriented designs are surveyed. Key design examples of existing parallel processing neurocomputers are also discussed. <<ETX>>
Encrypted Keyword Search in Cloud Computing using Fuzzy Logic

Research and Development, and information management professionals routinely employ simple keyword searches or more complex Boolean queries when using databases such as PubMed and Ovid and search engines like Google to find the information they need. While satisfying the basic needs of the researcher, basic search is limited which can adversely affect both precision and recall, decreasing productivity and damaging the researchers’ ability to discover new insights. The cloud service providers who store user’s data may access sensitive information without any proper authority. A basic approach to save the data confidentiality is to encrypt the data. Data encryption also demands the protection of keyword privacy since those usually contain very vital information related to the files. Encryption of keywords protects keyword safety. Fuzzy keyword search enhances system usability by matching the files perfectly or to the nearest possible files against the keywords entered by the user based on similar semantics. Encrypted keyword search in cloud using this logic provides the user, on entering keywords, to receive best possible files in a more secured manner, by protecting the user’s documents.
Calculation and Analysis of Constant Stiffness Space for Redundant Cable-Driven Parallel Robots

In this paper, a new concept of the constant stiffness space (CSS) of cable-driven parallel robots (CDPRs) is presented to meet the requirement for the constant stiffness plane of CDPRs in ground simulation spacecraft landing addressing experiments. First, the previously studied stiffness model and cable tension feasible region are reviewed. Then, the concept of the stiffness relative contribution coefficient is proposed, which can directly reflect the influence of controllable stiffness on system stiffness and guide the selection of driving cables and the setting of cable tension limiting values. Further, a method to calculate the CSS is proposed. This method can effectively obtain the CSS of robots according to the target stiffness. Next, an evaluation index for the local and global stability of the CSS is presented to analyze and evaluate the stability of the CSS of CDPRs. The influences of the load and posture of the end-effector of a CDPR on the volume and stability of the CSS are analyzed. The analysis results can serve as guidelines for determining the CSS in practical applications. The correctness and efficacy of the proposed method are verified through the experimental and theoretical analyses. The results show that the proposed method is computationally efficient and can obtain the CSS of CDPRs within a given accuracy range.
Handbook of Evolutionary Computation

From the Publisher: Many scientists and engineers now use the paradigms of evolutionary computation (genetic agorithms, evolution strategies, evolutionary programming, genetic programming, classifier systems, and combinations or hybrids thereof) to tackle problems that are either intractable or unrealistically time consuming to solve through traditional computational strategies. Recently there have been vigorous initiatives to promote cross-fertilization between the EC paradigms, and also to combine these paradigms with other approaches such as neural networks to create hybrid systems with enhanced capabilities. To address the need for speedy dissemination of new ideas in these fields, and also to assist in cross-disciplinary communications and understanding, Oxford University Press and the Institute of Physics have joined forces to create a major reference publication devoted to EC fundamentals, models, algorithms and applications. This work is intended to become the standard reference resource for the evolutionary computation community. The Handbook of Evolutionary Computation will be available in loose-leaf print form, as well as in an electronic version that combines both CD-ROM and on-line (World Wide Web) acess to its contents. Regularly published supplements will be available on a subscription basis.
Application of Sequential Rotation Technique on Monopulse Radar Antennas

In this paper an investigation of the effects of the sequential rotation technique on the sum and difference patterns of monopulse radar antennas is presented. A LHCP polarized test antenna is designed and simulated and used to build linear arrays in different configurations. 10 cases for sum pattern with amplitude uniform and tapered amplitude distributions as well as 6 cases for difference pattern are compared in beam direction, beam width and axial ratio. The results show an influence on the pattern in particular for tapered sum patterns and difference patterns.