Miracle-dz/UniFAR-FTUs huggingface dataset:
A Radial Line Slot Array Antenna with Improved Radiation Patterns for Satellite Communication

In this paper we have investigated aperture field distribution of a radial line slot array (RLSA) antenna to improve the radiation pattern quality. A circularly polarised (CP) RLSA antenna was designed with tapered amplitude distribution. The distribution was obtained by manipulating the slot lengths on the antenna aperture based on a slot coupling analysis. The antenna has achieved a peak directivity of 31.7dBic and a peak gain of 31.3 dBic at 19.3 GHz. A significant improvement has been achieved in reducing side lobe levels. The antenna has demonstrated a side lobe level of -28.8 dB in ϕ = 0° plane and -32.2 dB in ϕ = 90° plane at 19.3 GHz.
Design of a Reference Dipole-Loop Antenna Array at 28 GHz

This paper proposes an array antenna at 28 GHz that can be used to measure polarimetric omni-directional pathloss. The array consists of a printed microstrip dipole and loop with an integrated tapered balun structure. The design and experimental results of low profile microstrip dipole and loop antenna show wideband matching and radiation performance. Over 6 GHz of −10 dB impedance matching bandwidth has been achieved for the dipole, whereas the loop shows 0.2 GHz ranging from 27.9 to 28.1 GHz. A fairly good agreement between the simulated and measured radiation pattern validates our simulation method. The omni-directional behaviors of both dipole and loop make it suitable as a reference antenna for over-the-air antenna testing at 28 GHz.
Une heuristique de génération de colonnes pour le problème de tournees de vehicules avec faisabilité boite noire,Extended Abstract

Nous proposons de reformuler le VRPBB comme un probleme de partitionnement d'ensembles que nous optimisons a l'aide d'une approche (heuristique) de generation de colonnes. Des fourmis collectrices generent et collectionnent des colonnes (tournees) de facon heuristique, tout en etant guidees par des depots de pheromones provenant d'un oracle externe. Cet oracle calcule les depots de pheromones en fonction de la solution actuelle a la relaxation du probleme. L'approche nous permet d'ameliorer de maniere iterative la borne inferieure du probleme considere. Une solution entiere est trouvee en resolvant le probleme de partitionnement d'ensembles avec solveur MIP. Cet article presente trois contributions. D'abord, nous proposons un nouveau probleme generique, le probleme de tournees de vehicules avec faisabilite boite noire, qui permet de representer des problemes de tournees de vehicules exigeant la resolution d'un probleme combinatoire par tournee. Deuxiemement, nous proposons un algorithme pour resoudre ce probleme generique. Notre methode est donc independante du probleme combinatoire a resoudre pour chaque tournee. Elle peut facilement etre appliquee a un nouveau probleme en utilisant une autre fonction de faisabilite boite noire. Enfin, nous demontrons l'applicabilite de la methode proposee sur deux problemes, le VRP avec chargement en trois dimensions (3L-CVRP) et le VRP a piles multiples (MP-VRP). Nous comparons nos resultats avec ceux des approches dediees existantes pour montrer que notre approche generique est tres competitive.
An Unequal Power Divider Based on Ridge Gap Waveguide

This paper proposes a novel unequal power divider based on the ridge gap waveguide technology. Different from the conventional T-junction power divider, the unequal power divider is realized by using a half-height pin structure with an inserted conductor plane. The conductor plane is printed on a thin substrate for the mechanical feasibility. The power division ratio can be controlled by the position of the inserted conductor plane. In this paper, a 1:2 power divider is designed to verify this topology. The reflection coefficient is below -20 dB from 26 GHz to 32 GHz with 20.7% impedance bandwidth and the amplitude discrepancy between the two output ports is about 2.92 dB. Meanwhile, the maximum value of the phase difference is below 12°.
Flat Luneburg Lens at 0.24 THz for Antenna Beam Steering Applications

This paper presents an all dielectric flat Luneburg lens using transformation optics for THz beam steering. Using gradient-index dielectric materials it is possible to manipulate the direction of propagation of a THz wave in the medium. However, at THz frequencies, the dielectric losses become prominent and this suppresses the gain of a dielectric lens antenna. As a result, in this work the dielectric loss of the material for the THz lens is measured precisely and used in the modelled lens in CST Microwave Studio to predict its performance. Additionally, the possibility of beam steering using such a lens at THz frequencies is also discussed.
High Speed, Low Power, and Ultra-Small Operating Platform with Three-Dimensional Integration (3DI) by Bumpless Interconnects

This paper proposes a fundamental architecture for a realization of an ultra-small computing system. The prospect of three-dimensional (3D) integration for Terabyte large scale integration using bumpless interconnects with low-aspect-ratio TSVs and ultra-thinning are discussed. Bumpless (no bump) interconnects between wafers are a second-generation alternative to the use of micro-bumps for Wafer-on-Wafer (WOW) technology. The bumpless interconnects technology can increase the number of TSVs per chip with fine pitch of TSVs, and reduce the impedance of the TSV interconnects with no bumps. Therefore, a promising operating platform with a higher speed by enhancing parallelism, lower power by no bumps, and smaller size by thinning wafers, can be realized. By using this technology, the 3D NAND can read and program by plane instead of by line.
Non-Destructive Testing of Metal Backed Materials Using Reflection Mode Terahertz Spectroscopy

In this paper, we propose and demonstrate an accurate, fast and thickness independent reflection mode terahertz spectroscopy technique to determine the material parameters of the test specimen. A generalized closed form expression is derived to extract the index of refraction and thickness of the material under test. The proposed method removes the most influential error introduced in the determined index of refraction because of the mechanical measurement of the sample thickness. The method is numerically tested for two configurations, viz. metal backed specimen and air backed specimen. The extracted material parameters for both configurations are in good agreement with the reference data. The proposed technique is fast, non-destructive and self-calibrated; therefore it can find applications in automobile and aviation industries, where the materials are tested with metal at the backside of the specimen.
A Balanced Feed Quad-Ridged Horn Antenna

This paper presents an optimized balanced feed quad-ridged horn antenna. The two SMA probes are inserted into two symmetric ridges, and the inner conductors of the coaxial probes are connected on the horn's symmetric center. A balanced feeding network consists of a power divider and two analog or digital phase shifters is introduced. By adjusting the phase of the phase shifter, the phase offset caused by structural asymmetry can be calibrated. Symmetrical radiation pattern and low cross polarization is achieved from 2 to 6 GHz in full wave simulation. This antenna is used as the feed antenna of Compact Antenna Test Range (CATR) or satellite reflector antenna.
Experimental Characterization of V2I Radio Channel in a Suburban Environment

This paper describes the results of the experimental vehicle-to-infrastructure radio channel sounding campaign at 1.35 GHz performed in a suburban environment in Lille, France. Based on the channel measurements acquired in vertical and horizontal polarizations, a multitaper estimator is used to estimate the local scattering function for sequential regions in time, from which Doppler and delay power profiles are deduced. We analyze second order statistics such as delay and Doppler spreads, as well as small-scale fading amplitude. A similar behavior between both polarizations is observed. In both cases, the statistical distributions of the RMS delay and Doppler spreads are best fitted to a lognormal model. The small-scale fading of the strongest path is found to be Rician distributed, while the later delay taps show occasional worse-than-Rayleigh behavior.
Delay-Constrained Routing via Heterogeneous Vehicular Communications in Software Defined BusNet

As a critical part of public transportation systems, buses driving routinely in urban areas naturally form a bus ad-hoc network (BusNet). Different from conventional vehicular ad-hoc networks, the sparse distribution of buses magnifies the problem of intermittent network connectivity, making it more challenging for real-time routing. In this paper, we first present a novel architecture called software-defined BusNet, where the distributed controllers (i.e., base stations) collect traffic information and real-time requests from buses via vehicle-to-cellular communication. The collected information enables the logically centralized controller to make routing decisions with global traffic information. Then, the routing decisions are returned to roadside units (RSUs) and buses, which will instruct the data broadcast from RSUs to buses via vehicle-to-roadside (V2R) communication, and data forwarding among the buses through vehicle-to-vehicle (V2V) communication. On this basis, we formulate the problem of delay-constrained routing for BusNet (DCRB) which aims to maximize both the delivery ratio and the bandwidth efficiency. We build a probabilistic model to analyze the encounter probability and encounter delay between the relay buses based on the predicable bus traces. Further, we derive the expected reachability and expected delivery delay of the multi-hop routing path. The routing graph is constructed for searching the feasible routing paths via the modified Dijkstra algorithm. Four routing selection strategies are proposed based on different metrics: HRF (highest reachability first), SDF (shortest delivery delay first), MHF (minimum number of hops first), and RDH (combination of reachability, delay, and hop). Finally, we build the simulation model and implement the proposed routing algorithms for performance evaluation. The comprehensive simulation results demonstrate that RDH achieves the best overall performance on improving system delivery ratio and enhancing bandwidth efficiency.
GPU-based distortion correction for CMOS positioning camera using star point measurement

Due to machining errors and assembly errors, the optical system of the camera is somewhat different from the ideal model through the pinholes. That means, there are different degrees of non-linear optical distortion between the ideal image and the actual image formed by the camera. In order to improve the positioning accuracy of the camera, distortion correction should be done. This paper puts forward a GPU-Based Star Calibration and Proofreading Algorithm (GBSC-PA). This algorithm is completed by CUDA programmable graphics processor technologies, and a number of lens distortion coefficients are solved using star point images. Moreover, the optimal distortion correction matrix can be used to improve the accuracy and speed of the algorithm greatly. Through the experimental measurements and simulation, the feasibility and efficiency of the new algorithm are verified. Compared with the conventional correction algorithm based on CPU, the speed-up ratio of GPU-based parallel program can be reached to 43.094.
A Frequency-Scanned Continuous Transverse Stub Array with Broad Angle Based on SIW

A broadband continuous transverse stub (CTS) antenna array with wide steering range based on substrate integrated waveguide (SIW) is proposed in this paper. The broad steering angle is obtained by the novel coplanar waveguide (CPW) feedline loaded by slow-wave-structure. A reflector is located at one-fourth wavelength away from the antenna array to reduce the backward radiation. The proposed design has been simulated using the full-wave simulator of HFSS. The simulated results show that the -10dB bandwidth of the antenna array is 47.8 % (from 8.6 to 14 GHz). The main beam of the array can scan from -40° to 56° in E-plane with the operation frequency varying from 8.6 to 14 GHz. The gain in main radiation directions change within 9.8 ~ 12.3 dBi for all steering directions.
Cavity-excited Ferroelectric Lens Antenna for Low-Sidelobe Beam Steering

Utilizing the technique of cavity excitation, this paper proposes a novel beam steering antenna with low sidelobe level. The whole beam steering antenna consists of two parts, i.e., a parallel plate waveguide based ferroelectric lens and a cavity-type feeding source. By independently tuning the DC bias voltage of each column of the ferroelectric lens, the beam of feeding source can be effectively collimated and steered in the far-field. By eliminating the spillover radiation at lens edge, low-sidelobe beam steering can be implemented. Full-wave simulated results show that the proposed antenna can achieve sidelobe levels of -34 dB at 0° steering angle and -25 dB at 30° steering angle. Without involving the complex feeding networks, the proposed lens antenna provides a promising alternative of complicated phased array antennas.
Dual-Polarized MIMO Antenna Array Design Using Miniaturized Self-Complementary Structures for 5G Smartphone Applications

In this study, a new eight-port dual-polarized multiple-input multiple output (MIMO) antenna array design for 5G smartphone applications is proposed. The design contains four pairs of compact dual-polarized self-complementary slot-patch antennas fed by a pair of independent coupled feeding structures. The radiation elements are designed to operate at 3.6 GHz and are located on the corners of the mobile-phone PCB with an overall dimension of 75×150 mm2. A Rogers 5880 dielectric with permittivity 2.2 and loss tangent 0.0009 is chosen as the PCB substrate. The antenna element is highly miniaturized and suitable for use in 4G/5G smartphones. The design not only provides the required radiation coverage but also generates dual-polarizations. The antenna offers good isolation, high-gain radiation patterns, and sufficient efficiencies.
IoT based Disaster Monitoring and Management System for Dams (IDMMSD)

Dams are of major importance, primarily because of their use for generating hydroelectricity and irrigation purposes. This has resulted in the construction of a number of dams in potential areas over the years. As there are a lot of risk factors associated with the existence of these dams, it has become the need of the hour to develop a proper monitoring and regarding the opening of the shutters thereby management system for maintaining a safe water level in dams. Mismanagement of dams can lead to manmade disasters. Currently dams in our state are being monitored and controlled manually. This manual intervention can increase the probability of error and also results in time lag in decision making. The aim of this project is to design and implement an IoT based Disaster Monitoring and Management System for Dams (IDMMSD). The proposed system involves real-time monitoring of water levels of a group of dams under study. Water levels may vary due to drastic changes in water levels of connected rivers or lakes, or due to excessive rainfall in the catchment area. The proposed project includes a mechatronics system to open the shutters at the heights pre calculated. The system comprises of sensor nodes, smart controller and communication system. The proposed system is an app based IoT system which will monitor and send real time parameters related to Dam (gate position, water discharge, water level) and weather conditions (rain fall, temperature, humidity). There will be two modes for operating the software i.e. Autopilot mode and Manual data mode. The system also includes features like SMS alert to the people of the locality and SOS to rescue operations in case of adverse weather conditions.
PLD implementation of control algorithms: design and validation [power electronics]

After an introduction to the new features of programmable components, the paper discusses the application of such devices to power electronics. The role of these components in the design of a modulator is introduced, considering both a simple hardware solution and a mixed hardware and software solution. A design methodology is presented and a detailed description of a validation process based on high level Petri nets is given. Some application examples complete the discussion.
Improving Confidentiality in Virtualized FPGAs

FPGAs are being deployed in modern datacenters to provide users with specialized accelerators that offer superior compute capability, increased energy efficiency, lower latency, and more programming flexibility than CPUs. However, FPGAs are not utilized as efficiently in datacenters: unlike CPUs, FPGAs in datacenters are currently not shared between users due to potential security risks. The higher flexibility that comes with FPGAs also gives more capabilities to malicious users. Several recent studies have demonstrated examples of FPGA user applications capable of remotely sniffing data from other applications running on the same FPGA. In this work, we look at various ways to ameliorate these threats by encrypting/decrypting the user application's data under different trust levels for current virtualized FPGAs. We also discuss the role of interconnect and discuss the potential of more efficient security features that can be implemented together with the interconnect if the FPGAs use a hard network on chip.
Millimeter-wave Near-field Spectrum Analyzer Based on Integrated Side-fire Antennas

A real-time, low-profile and shielded spectrum analyzer is proposed for operation at mm-wave frequencies based on Substrate Integrated Waveguide (SIW) technology. A novel unit cell is also proposed to enable an in-plane side-fire radiating Leaky Wave Antenna (LWA). The unit cell is inspired from a conventional T-junction and is equipped with an internal matching mechanism to suppress stop-band to achieve full-space radiation. The antenna characteristics and the system operation is confirmed using full-wave simulations. The proposed system is analog, broadband, real-time in nature, low-profile and compact in size; ideal for instrumentation applications.
Longitudinal Control of Agile Fixed-Wing UAV Using Backstepping

In this paper, a nonlinear backstepping based longitudinal control is applied to an agile fixed-wing unmanned aerial vehicle (UAV)to achieve transitioning between level flight at low angle of attack (cruise)and level flight at high angle of attack (harrier level)and the performance is compared with a gain scheduled state feedback control. In all flight regimes, the elevator control law is computed using backstepping control strategy designed for error dynamics in pitch and pitch rate. During transition from cruise to harrier flight, the propeller rotations per minute (RPM)is calculated using an additional Lyapunov based nonlinear control which stabilizes the error dynamics in flight path angle to zero. During cruise and harrier level, the respective trim value of RPM is applied and during transition from harrier to cruise the trim value corresponding to cruise is applied. Simulations of the control implemented on a longitudinal model of an agile fixed-wing UAV which includes propwash, wing downwash, flat plate post-stall aerodynamics and actuator constraints (first order dynamics, saturation and rate limit)to achieve the flight objective, are done using Matlab 9.4®. Compared to gain scheduled state feedback control, the advantages of the nonlinear control strategy are: 1)less altitude loss and oscillations in velocity and pitch angle during harrier to cruise transition, 2)reduction of around 60 % in maximum pitch rate during both transitions and 3)less chattering during both transitions. However, significant increase in computational complexity is a disadvantage. Overall, a preliminary assessment can be made that the nonlinear control strategy is better than the gain scheduled state feedback control for achieving the specific flight regime and could be advantageous in high angle of attack (AOA)maneuvers like perching, transition to hover and aggressive maneuvers.
Near-field vertical coupling between terahertz photonic crystal waveguides

We demonstrate near-field coupling between terahertz photonic crystal waveguides in the out-of-plane dimension, with no direct physical contact, by making use of coupled-line techniques. Efficient transfer (i.e., $\sim 80$%) of terahertz power from one waveguide to another is experimentally achieved. Thereafter, multi-Gbps data is successfully transmitted via this near-field link. This study can be considered a step towards practical connectors between terahertz photonic crystal waveguide circuits.
SAT Based Place-And-Route for High-Speed Designs on 2.5D FPGAs

2.5D stacking technology allows us to build high performance and high capacity FPGA devices at reasonable costs. The communication between multiple dies happen on a passive silicon interposer at high speed, which pose several interesting challenges. Due to clock skew characteristics across multiple dies and increase in the min-max spread of delays, place-and-route tools need to address inter-die hold violations and optimize for performance. We implement a tractable SAT based methodology to achieve this by minimally detouring data paths to meet all hold requirements while optimizing performance. We also confine the solution to a small window around each inter-die (Laguna) channel to reduce routing resource utilization, congestion, and scale the methodology to any Laguna channel utilization. We improve performance across the interface by 11% compared to a state-of-the-art commercial flow and meet a 500MHz spec on Xilinx(R) UltraScale+(TM) devices in 2E speedgrade. We address the scalability concerns of SAT and show how we can use this in practice with negligible runtimes in implementation tools. Our solution paves the way for FPGA-as-a-service platforms where fast inter-die communication, that does not interfere with user specific logic, is pivotal to their success.
Dual-Band MIMO Antenna System for 5G Mobile Terminals

A dual-band antenna system for multiple-input multiple-out (MIMO) applications in 5G mobile terminals is presented in this paper. The proposed antenna system consists of eight antenna elements which are placed along two long edges of the mobile terminal. Good antenna total efficiency is obtained for both the low band (3.3-3.6GHz) and high band (4.8-5.0GHz), while the isolation is better than 15dB between each port. Envelope correlation coefficient (ECC) and channel capacity (CC) are used to evaluate the MIMO performance of the proposed MIMO antenna system. An antenna prototype is fabricated and measured; and a quite good agreement between simulation and measurement is obtained.
User Mining Algorithm Based On PageRank Modeling Improvement and Comprehensive Influence Evaluation

Microblog has become the most popular medium of mass information dissemination. Users can know more friends in this virtual network through microblog's recommendation function. For example, Sina microblog, users can find like-minded people through the "add friends - interest" module, at present, microblog only recommends authenticated users or users' friends, and does not recommend most influential users to them. In view of the shortcomings mentioned above, this paper improves the PageRank modeling and adds the assessment of interaction and personal influence, thus improving the accuracy and comprehensiveness of the influential users' mining。 In order to verify the rationality and effectiveness of the algorithm, the real user data on Sina microblog based on Python grabbing were used for algorithm simulation, the experimental results show this algorithm has obvious advantages in terms of accuracy and recall rate when searching for potential influential users.