nils-herrmann/clean_scirepeval huggingface dataset:
Enhanced topology for the design of bandpass elliptic filters employing inductive windows and dielectric objects

This work presents a new topology for the design of bandpass elliptic filters employing inductive windows and dielectric objects. The proposed filtering structure combines, for the first time, the modified TE102 resonating mode with the modified TE201 mode. The TE201 mode is excited by placing a wide dielectric post inside a waveguide cavity. The main advantage of the new topology is that two transmission zeros can be synthesized in the insertion loss response of the filter, for a second order structure. Also there is a high flexibility on the location of the transmission zeros. They can be synthesized along the frequency axis for maximum selectivity, or as a pair of complex poles for phase equalization.
Design of Bandpass Elliptic Filters Employing Inductive Windows and Dielectric Objects

In this paper, we propose an alternative configuration for the design of bandpass inductive filters using transversal topologies. The structure is based on the use of a dielectric post asymmetrically placed on a cavity resonator. The input and output windows will couple energy to the TE102-and TE103 -mode resonators at the same time, therefore obtaining the transversal topology. The proposed configuration is very compact, and allows to implement transmission zeros for maximum selectivity in an easy way. Results are validated with Ansoft's finite-element High Frequency Structure Simulator tool, and with an integral-equation technique to demonstrate the validity of the proposed structure.
Field test results of a self-monitored supervisor current transformer to reduce non-technical losses

Reduction of non technical losses, in electrical systems, is a huge challenge. Cepel has developed and patented a solution for monitoring electric metering systems based on intelligent instrument transformers, in order to reduce non-technical losses and monitor all billing metering equipment. The main focus of this solution is applied to customers premises connected through indirect metering system. One of these devices is the so called Self-Monitored Current Transformers (TCAMs) and its other simplified version, Self-Monitored Current Supervisor (FCAM). Tests were performed before in both prototypes of these devices at the CEPEL's laboratories, indicating positive aspects and great potential for the use in utilities. This paper describes additional results obtained from field tests, with three prototypes of FCAMs connected in low-voltage premises, in which electrical energy measurement uses conventional current transformers. Comparisons between data measured by the FCAMs and the electric energy meter are performed in these installations, in order to validate the performance of this solution in real operational condition. The results demonstrate that the proposed TCAM / FCAM solution can be an excellent tool to diagnose and reduce non-technical losses.
Multiple Resonant Controllers for Uninterruptible Power Supplies—A Systematic Robust Control Design Approach

This paper deals with the synthesis problem of multiple resonant controllers for uninterruptible-power-supply systems in a robust control framework. The controller parameters aiming the tracking of sinusoidal reference signals (with zero steady-state error) and the rejection of harmonic components of the output voltage (when supplying energy to time-varying nonlinear loads) are determined by means of a convex optimization problem subject to a set of linear-matrix-inequality constraints. Results from a 5.0-kVA experimental setup are considered to illustrate and validate the proposed approach.
Encoder Rate Control for Transform Domain Wyner-Ziv Video Coding

Wyner-Ziv (WZ) video coding -a particular case of distributed video coding (DVC) -is a new video coding paradigm based on two major Information Theory results: the Slepian-Wolf and Wyner-Ziv theorems. Many of the practical WZ video coding solutions available in the literature make use of a feedback channel (FC) to perform rate control at the decoder which implies there must be a FC available in the application scenario addressed. The FC-based DVC solutions also have implications in terms of delay and decoder complexity since several iterative decoding operations may be needed to decode the data to the target quality level. In this context, this paper proposes an encoder rate control (ERC) solution for the transform domain WZ coding architecture previously using a FC driven rate control. Although this is the first solution in the literature, promising results are achieved with the proposed ERC solution without significantly increase the encoder complexity.
Two simple implementations of transversal filters with coupling between non-resonant nodes

This paper introduces two novel configurations, both with the same circuit topology, for the synthesis of pseudo-elliptic microwave filter responses. The structures are of second order, and implement two transmission zeros and two reflection zeros in the frequency response of the filter. The basic structure consists on input and output ports coupled, in a shunt configuration, to two resonators of different lengths, and presents also an additional coupling between the source and the load. Depending on the sign of this last coupling, dual frequency responses can be obtained. In this paper two possible microstrip implementations of passband of stopband filters are proposed, following this circuit topology. A manufactured prototype is presented. Measured results confirm the theoretical predictions, and validate the novel structures for high selectivity applications.
A methodology for replanning collision free trajectories for a mobile robot

A methodology for planning optimized collision free trajectories for a mobile robot is presented. This methodology consists in making necessary modifications to a precomputed trajectory in order to avoid collisions with fixed or moving obstacles not previously considered or detected. The methodology is intended to be used on an online trajectory replanner of a mobile robot and is particularly suited for robots operating in semi-structured environments. The optimization has to do with finding the best trade-off between the best path to accomplish the proposed goals and the flexibility necessary to safely avoid unpredicted obstacles.<<ETX>>
Visualizing Thermal Information and Knowledge Creation in Grain Storage Bin Based on Three-Dimensional (3D) Interface Model and Computer Graphic Techniques

This paper presents a new methodology for studying thermal behavior of grain storage bins through the use of intelligent instrumentation combined with an advanced three-dimensional (3D) interface model using computer graphic techniques, which is useful for increasing the safety margin of storage processes with consequent loss decrease. Result was obtained by incorporating into the automation process a vector regarding to spatial and temporal temperature variability in these bins, which is essential for decision-making in storage processes. The algorithm was developed as an integral part of an application system for IBM-PC computers with a Microsoft Windows platform. A Borland C++ Builder 6 was used in its development. The environment created, using the OpenGL Library and its auxiliary libraries, allows 3D data visualization, and simultaneous observation of temperatures in preprogrammed positions with their interaction with other planes or regions of interest.
Simple and accurate transverse equivalent network to model radiation from hybrid leaky-wave antennas with control of the polarization

A novel technique to control the polarization in stub-loaded leaky-wave antennas was first proposed in , and lately studied in more detail in . The cross section of the antenna, based on hybrid waveguide-planar technology , is shown in Fig.1-a. In , it was shown how this technology allows to obtain horizontal, vertical, elliptical and circular polarizations. However, the designs presented in  were performed using three dimensional electromagnetic simulations obtained from commercial finite element solver (HFSS). These designs were also validated with experiments in . In this paper we present a novel transverse equivalent network (TEN) to analyze in a more efficient way the behavior of the proposed leaky-wave antenna (LWA).
Simulations and analysis of distribution systems with aspects of smart grids using MICQ, RTDS and PSCAD

This paper presents a procedure for the analysis of distribution systems including aspects of smart grids such as the inclusion of distributed generators and protection devices. The procedure uses MICQ to obtain detailed and accurate results. The results are compared with RTDS and PSCAD simulations. Some studies are performed to analyze distribution system performance in real time and protection devices.
An Efficient Technique to Assess the Convergence of the Multimode Equivalent Network for Waveguide Devices

Numerical methods are widely used to analyze and design microwave components for communication applications. In the implementation of any numerical technique, however, there are always a set of parameters that must be properly adjusted in order to obtain, at the same time, computational efficiency and numerical accuracy of the results. In this context, therefore, we focus in this paper on the multimode equivalent network formulation for waveguide devices, and we propose a more intuitive and efficient strategy for choosing these parameters. Following our approach, setting only one global numerical variable is sufficient to adjust automatically the specific convergence parameters of each discontinuity to give a specific level of numerical accuracy of the results. As a consequence, the computational efficiency is significantly increased. In addition, the user experience is significantly improved since our approach eliminates all lengthy convergence tests previously needed to assure good numerical accuracy. In addition to theory, we discuss in this paper a number of numerical results that clearly demonstrate how the new strategy is very effective, thereby fully validating the theoretical formulation.
Video Summary - Neptus, Command and Control Infrastructure for Heterogeneous Teams of Autonomous Vehicles

This video shows a brief overview over Neptus, a command and control infrastructure for heterogeneous teams of autonomous vehicles. Having different types of vehicles at our laboratory and from our partners, there was an increasing need to create a common infrastructure to all these systems. Additionally, a tool to support the entire mission life cycle (planning, execution, review and dissemination) was lacking. Neptus was created to provide vehicle independence and seamless inter-systems communications. Currently, Neptus has been already tested with remotely operated vehicles, autonomous underwater vehicles, unmanned air vehicles, autonomous surface vehicles and wireless sensor networks. Some of these systems were operated simultaneously by various operating consoles that were sharing the same communication infrastructure. The received data was being relayed to a Web server that allowed for the real-time mission following by using a common Web browser.
Necessary conditions of optimality for impulsive control problems with state constraints

This article concerns necessary conditions of optimality for impulsive control problems with dynamics given by measure driven differential inclusions or controlled differential equations and featuring both state and control constraints. We address a paradigm more general than the one usually considered in the literature since, here, the singular dynamics may depend on both the state and the control variables. One key feature of our optimality conditions consists in the fact that we consider problems which, besides the more common pointwise control and endpoint constraints, also exhibit state constraints.
Design and prototyping of direct torque control of induction motors in FPGAs

This work presents an implementation of a direct torque control (DTC) strategy, which is used to control induction motors. Following a tendency in this research area, the algorithm proposed is implemented in a unique FPGA substrate, which allows for a faster validation and simplifies the control structure. A binary format is used with a variable word-size approach, which permits a reduction in truncation through the calculation processes, resulting in smaller errors without increasing excessively the hardware area in the prototyping step. Matlab is used to validate the algorithm. The calculation error between Matlab's double precision representation and the proposed alternative is small and can be neglected in DTC control.
Development and implementation of a low-cost LBL navigation system for an AUV

A reliable navigation system is a key factor for the success of an operational mission with an AUV in a real scenario. We address the main issues involved in the implementation of a long baseline (LBL) navigation system for a REMUS AUV. This system replaces both the original hardware and software of the vehicle with a simpler, faster, less expensive and more precise system, based on a Kalman filter. We also discuss the influence of transponder location in the overall performance of the LBL navigation, and present results obtained with this new system in operational missions.
Defending Internet of Things against Exploits

The Internet of Things (IoT) demands tailor-made security solutions. Today, there are a number of proposals able to meet IoT's demands in the context of attacks from outsiders. In the context of insiders, however, this does not hold true. Existing solutions to deal with this class of attacks not always take into consideration the IoT's idiosyncrasies and, therefore, they do not produce the best results. This work aims at coming up with tailor-made security schemes for thwarting attacks from insiders in the context of IoT systems. Our solution makes use of a pioneering solution to pinpoint vulnerabilities: we crosscheck data from communicating nodes. It provides the same guarantees as traditional security mechanisms, but it is about 83% more efficient, according to the experiments that this article describes.
Distributed video coding: Basics, main solutions and trends

After the great success of the predictive video coding approach, which led to a number of largely deployed MPEG and ITU-T standards, the video coding research community has been working on a new video coding paradigm, so-called distributed video coding (DVC), which is based on some Information Theory results from the 70s: the Slepian-Wolf and the Wyner-Ziv theorems. The first practical solutions have emerged around 2002 at the Stanford University and the University of California, Berkeley. This talk will address the basics, main solutions and trends on distributed video coding with especial emphasis on the Stanford DVC codec which has deserved a larger research investment. The rate-distortion (RD) performance of a state-of-the-art Stanford based DVC codec will be presented and benchmarked by the relevant alternative standard based video coding solutions. Finally, some trends on the DVC research will be discussed.
A moving path following approach for trajectory optimization of UAVs: An application for target tracking of marine vehicles

In this paper we propose a novel numerical approach to the design of smooth trajectories for fixed-wing Unmanned Aerial Vehicles (UAVs) with applications to target tracking of marine vehicles. Given a desired geometric path with respect to a possible moving target vehicle, we are interested in computing a feasible UAV trajectory that best approximates in L2 sense the desired geometric moving path with a specified airspeed profile assigned on it. Due to communication range limitations (e.g., the UAV is operating as a wireless communication relay between a target vehicle and a ground station), the UAV trajectory needs to satisfy given path constraints. Space-varying wind is also taken into account. We address this problem by taking a Virtual Target Vehicle (VTV) perspective. We set up a suitable optimal control problem based on the error coordinates between the UAV and the VTV. We solve the optimal control problem numerically by using PRONTO, a very versatile control optimization tool enabling to deal with a wide variety of trajectory functionals and constraints. We provide and discuss numerical computations based on a practical scenario where an Autonomous Surface Vehicle (the target vehicle) transmits data to the UAV which sends them back to a ground station.
Video compression: An evolving technology for better user experiences

Video compression is a key technology in the current multimedia services and applications landscape, which has been evolving to provide increasingly powerful user experiences. This evolution has continuously enlarged the set of networks and terminals able to provide video enabled experiences, as well as continuously improved the quality of the experiences provided for important services and applications, ranging from digital TV, and mobile and Internet video streaming to video games and Blu-ray discs. This evolution and its market impact is strongly determined by the set of video compression standards developed along the years since these standards allowed to provide easier interoperability and reduce the deployment costs. This paper reviews the current status quo in video compression, as well as the main trends, with special emphasis on video compression standards, considering their particular influence on the deployment success of this technology.
Efficient Analysis and Design of Novel SIW Leaky-Wave Antenna

A novel transverse equivalent network is developed in this letter to efficiently analyze a recently proposed leaky-wave antenna in substrate integrated waveguide (SIW) technology. For this purpose, precise modeling of the SIW posts for any distance between vias is essential to obtain accurate results. A detailed parametric study is performed resulting in leaky-mode dispersion curves as a function of the main geometrical dimensions of the antenna. Finally, design curves that directly provide the requested dimensions to synthesize the desired scanning response and leakage rate are reported and validated with experiments.
Frequency Steerable Two Dimensional Focusing Using Rectilinear Leaky-Wave Lenses

The concept of frequency steerable two-dimensional electromagnetic focusing by using a tapered leaky-wave line source embedded in a parallel-plate medium is presented. Accurate expressions for analyzing the focusing pattern of a rectilinear leaky-wave lens (LWL) from its constituent leaky-mode tapered propagation constant are described. The influence of the main LWL structural parameters on the synthesis of the focusing pattern is discussed. The ability to generate frequency steerable focusing patterns has been demonstrated by means of an example involving a LWL in hybrid waveguide printed-circuit technology and the results are validated by a commercial full-wave solver.
Defending Code from the Internet of Things against Buffer Overflow

The Internet of Things (IoT) demands tailor-made security solutions. Today, there are a number of proposals able to meet IoT's demands in the context of attacks from outsiders. In the context of insiders, however, this does not hold true. Existing solutions to deal with this class of attacks not always take into consideration the IoT's idiosyncrasies and, therefore, they do not produce the best results. This work aims at coming up with tailor-made security schemes for thwarting attacks from insiders in the context of IoT systems. Our propose makes use of a pioneering solution to pinpoint vulnerabilities: we crosscheck data from communicating nodes. Our solution provides the same guarantees as traditional security mechanisms, but it is about 83% more efficient, according to the experiments that this article describes.
Combined Self-Seeding and Carrier Remodulation Scheme for WDM-PON

In this work, we propose a novel self-seeded WDM-PON topology. Unlike previous works, in our case, the self-seeding occurs in RSOAs located at the OLT, allowing upstream transmission based on carrier remodulation at the ONT. Thus, a single wavelength per user can be employed for both traffic directions while eliminating the need for an external broadband light source at the CO. A maximum bidirectional 2.5 dB power penalty for a BER of 10-10 was obtained for an injection power level of -22 dBm into the ONT RSOAs. We also investigate the tolerance of downstream BER to downstream extinction ratio (ERD) and self-seeding power (Pss), as well as analyze the impact of upstream extinction level (ERUP), injection power (Pinj) and ERD levels on upstream BER performance, on symmetric 1.25 Gbps OOK transmission over 20 km without DTLA and FFCI mechanisms. We have successfully demonstrated downstream error free transmission (BER of 10-12) for an as low as 3.5 dB.
Correlation noise modeling for multiview transform domain Wyner-Ziv video coding

Multiview Wyner-Ziv (MV-WZ) video coding rate-distortion (RD) performance is highly influenced by the adopted correlation noise model (CNM). In the related literature, the statistics of the correlation noise between the original frame and the side information (SI), typically resulting from the fusion of temporally and inter-view created SIs, is modelled by a Laplacian distribution. In most cases, the Laplacian CNM parameter is estimated using an offline approach, assuming that either the SI is available at the encoder or the originals are available at the decoder which is not realistic. In this context, this paper proposes the first practical, online CNM solution for a multiview transform domain WZ (MV-TDWZ) video codec. The online estimation of the Laplacian CNM parameter is performed at the decoder based on metrics exploring both the temporal and inter-view correlations with two levels of granularity, notably transform band and transform coefficient. The results obtained show that better RD performance is achieved for the finest granularity level since the inter-view, temporal and spatial correlations are exploited with the highest adaptation.
Efficient plenoptic imaging representation: Why do we need it?

The 3D representation of the world visual information has been a challenge for a long time both in the analogue and digital domains. At least in the past decade, 3D stereo-based solutions have become very common. However, several constraints and limitations ended up causing a negative impact on its user popularity and market deployment. Recent developments in terms of acquisition and display devices have shown that it is possible to offer more immersive and powerful 3D experiences by adopting higher dimensional representations. In this context, the so-called plenoptic function offers an excellent framework to analyze and discuss the recent and future developments towards improved 3D imaging representations, functionalities and applications. Since they are associated to huge amounts of data, the new imaging modalities such as light fields and point clouds critically ask for appropriate efficient coding solutions. In this context, the main objective of this paper is to present, organize and discuss the recent trends and future developments on 3D visual data representation in a plenoptic function framework. This is critical to effectively plan the next research and standardization steps on 3D imaging representation and coding.
Design of a mission management system for the autonomous underwater vehicle MARIUS

This paper describes the initial design phase of the software control architecture for the AUV MARIUS. This research effort is part of a long term project that aims to enable the prototype vehicle to carry out environmental surveying missions in coastal waters, in a completely autonomous mode. Throughout the project, MARIUS will be used as an advanced testbed to test developments in the areas of mission planning and real-time mission execution systems for AUVs.