nils-herrmann/clean_scirepeval huggingface dataset:
An efficient partial feedback linearization current controller for grid connected photovoltaic system

This paper aims to present an efficient nonlinear current control scheme for a single-phase grid-connected photovoltaic (PV) system in which the controller is designed using partial feedback linearization and a linear controller. The proposed controller solves the difficulty of tuning the gain in conventional linear controllers under changing atmospheric conditions. The performance of the controller is evaluated based on the tracking of grid current to the reference current by considering the changes in solar irradiation levels. The comparison between the current tracking of the partial feedback linearization with PI and PR controllers are also presented.
An instrumented compliant wrist for robotics applications

The design and implementation of an instrumented compliant wrist is presented. The compliance helps reduce the impact effects of robot/environment interaction and improves force control performance. However, position accuracy of the end-effector degrades with increased compliance. Instrumentation of the compliant wrist enables it to serve as a compliant force/torque sensor which can be used to achieve both responsive force control and accurate position control. The wrist device uses rubber elements for compliance and damping, and a serial linkage, with potentiometers at each joint, is used for sensing deflections produced in the wrist. The wrist is connected in series between the end of the robot and the tool, and is designed to partially surround the tool, thus reducing the distance between the end-effector and the tool. A hybrid control scheme is implemented to enable the wrist to be used in a variety of applications. Example applications, including tool usage, are presented.<<ETX>>
A comparison of L-band helix TWT experiments with CHRISTINE, a 1-D multifrequency helix TWT code

Extensive experimental measurements were carried out to test the accuracy of the parametric helix traveling-wave tube (TWT) code, CHRISTINE. The model is one-dimensional, with beam electrons represented as rigid disks. Multifrequency interactions are supported and the RF circuit can be optionally represented with cold-test data, a sheath helix model, or a recently implemented tape helix model. Simulations using the tape helix model are shown to be in good agreement with experimental measurements of an L-band TWT over a broad (250-MHz) frequency range. In the intermediate and saturated power regimes, the modeled and measured TWT gain versus frequency agree to better than 0.4 dB, with deviations explained by strong reflections at the output window that are not accounted for in the code. Single-tone experimental and simulated drive curves agree to better than 1 dB in the small- and large-signal regimes; relative phase shift simulations agree to within experimental measurement accuracy in the small-signal regime and to within 75% in the large-signal regime. Two-tone experimental and modeled data exhibit similarly good agreement, with CHRISTINE accurately predicting the effect of frequency-dependent gain variations on the TWT output response and third- and fifth-order intermodulation products.
Data-driven Networking Reveals 5-Genes Signature for Early Detection of Lung Cancer

A new strategy is developed for a gene signature search proceeding from a biological basis in analyzing microarray databases. The procedure involves a combination of known and original methods for correlation, statistical, and network analysis. The application of the strategy to lung adenocarcinoma resulted in a 5-gene signature, which included four genes not associated earlier with lung adenocarcinoma. 93-96% accuracy of classification of cancer vs. normal was achieved. The final stage of our procedure included expanding of the gene signature network to a 43 gene/protein network, which showed that the five genes are in the cross-talk of 24 pathways, providing thus information for mechanistic analysis.
Characterising and calibrating the SCUBA-2 superconducting bolometer arrays for science observing

SCUBA-2 is a 10,000 pixel wide field sub-millimeter camera which started science observing on James Clerk Maxwell Telescope (JCMT) in the spring of 2010. We present the results of characterising individual 1280 bolometer science grade sub-arrays, as well as experience from operating the instrument.
A relationship between the recursive least squares update and homotopy continuation methods

The authors present an alternative derivation of the general recursive least squares (RLS) algorithm using homotopy approaches. Homotopy continuation methods are briefly described, and a simple iterative update for path following is derived. A homotopy function is then constructed using the RLS filtering criteria. The equivalence between the iterative update for following the path defined by this homotopy function and the general RLS update is derived. Finally, an intuitive explanation of this result is presented.
Efficiency of helix PASOTRON backward-wave oscillator

A three-dimensional (3-D) "amplifier model" describing the steady state operation of the helix plasma-assisted slow-wave oscillators (PASOTRON) backward-wave oscillator (BWO) is presented. This model contains an equation for the envelope of the wave, whose first space harmonic is synchronous with the electron beam for the case of interaction with the backward wave, and equations for the electron 3-D motion under the action of all the field components. In the latter equations, the Hamiltonian formulation is used to reduce the number of coordinates to be integrated. The results showed that electrons injected inside the helix are those that contribute most to the device electronic efficiency over those electrons injected outside the helix. It is also shown that by reducing the beam size, high efficiencies up to 55% can be achieved. Such high electronic efficiency, which is unachievable in conventional BWOs driven by magnetized electron beams with one-dimensional motion, can be explained by a favorable effect of the transverse motion of electrons.
Design of high-average-power near-millimeter free electron laser oscillators using short period wigglers and sheet electron beams

The design and feasibility of a 1-MW continuous-wave (CW) free electron laser (FEL) oscillator are reviewed. The proposed configuration includes a short-period (I/sub w/ approximately 1 cm) planar wiggler, a sheet electron beam, a 0.5-1.0-MV thermionic electron gun, a hybrid waveguide/quasi-optical resonator, commercial DC power supplies, and a depressed collector. Cavity ohmic RF losses are estimated to be extremely low ( >
Ad Hoc Based Secure Architecture for Survivable and Reliable Substation Automation System

This paper presents an ad hoc based secure architecture for survivable and reliable substation automation system (SAS). Various security attacks with existing routing protocols are presented and a new secure wireless routing protocol is proposed to identify malicious and unauthorized nodes and counter these attacks on substation automation systems networks. Performance of the proposed protocol is tested and analysed with the embedded security model using SWANS (scalable wireless ad-hoc network simulator). Simulation results show that the proposed secure protocol performs better than the existing secure protocols for SAS networks.
A novel RFID dipole tag with meandered arms and a modified T-match for UHF band

The design and development of a novel RFID dipole tag with meandered arms and a modified T-match for UHF band are presented. The fabricated tag with optimized parameters is characterized using an RFID reader STA IR0507E. This dipole tag shows good read range characteristics over the entire UHF RFID band of 860–930 MHz. The variations of read range over elevation and azimuth angular ranges are measured and the results are presented.
Current status of the large-signal code TESLA: Recent development and new applications

TESLA is a 2.5D large-signal code, which is suitable for the modeling of single-beam and multiple-beam amplifiers based on linear propagating beams. Initially developed for the modeling of conventional, single-beam klystrons mainly, later on the code was extended and successfully validated to allow modeling of multiple-beam klystrons (MBKs), extended interaction klystrons (EIKs) and Inductive Output Tubes (IOTs). This work reports the current status of the code TESLA, including the latest advances in its development, validation and successful extension of its applicability.
Broadband vector channel sounder for MIMO channel measurement

3G and 4G mobile communication systems consider multiple antennas at both receiver and transmitter for reaching enhanced channel capacity at well defined quality of service. Perfect design of such systems requires profound knowledge of the radio channel, especially its time-variant characteristics in various radio environments. A precise characterization of the radio channel is given by the vector channel impulse response (VCIR). In multi input multiple output (MIMO) systems the VCIR is measured for each transmitting antenna to a configured RX antenna array. The time variance of the radio channel requires high speed recording of VCIR with respect to the maximum Doppler frequency. The presented vector channel sounder covers all MIMO aspects. Up to 256 MIMO channels can be configured by software. The broadband technique grants high time resolution. Superresolution techniques can be used for joint estimation of time delay, direction of arrival and direction of departure with respect to multipath propagation. The measurement data can be used directly (as stored radio channel) as well as indirectly (as derived channel model) for realistic link- and system-level simulation. (4 pages)
A linear algorithm for motion estimation using straight line correspondences

A linear algorithm is presented for determining 3-D motion parameters of a rigid object based on straightline correspondences. The algorithm requires a minimum number of thirteen-line correspondences over three frames. It comprises three steps: three intermediate matrices are computed; several candidate solutions of the rotation matrices and translation vectors are obtained from the intermediate matrices; and motion parameters are uniquely determined by the physical constraints of the 3-D rotations and translations. Some simulation results are given.<<ETX>>
Consensus Oriented Recommendation

Recommender systems are useful tools that help people to filter and explore massive information. While most recommender systems focus on providing recommendations for individuals, people's minds are easily altered and dominated by crowds, especially in a socialized environment. In addition to fulfill personalized intentions, more considerate recommendations, which maximize satisfactions of both individuals and common interests within crowds, are expected in various daily-life scenarios: e.g., scenic spots recommendation to help trip planning making for a group of friends, and movie/TV program recommendation for family members. In this paper, we aim at advancing the group recommendation and propose a novel approach which predicts user preferences with the consideration of "group consensus". We combine observations from real-world group discussions with the model learning and conduct several experiments on a real-world dataset. The results show that the proposed approach benefits both individual and group recommendation and surpasses the state-of-the-art approach in terms of individual preference prediction.
A NS-3 module for LTE UE energy consumption

NS-3 has evolved into a very popular simulator platform for networking research studies. As energy consumed by LTE user equipment (UE) is of keen interest to researchers working in wireless networks, they often analyze the energy consumed by a UE when running network simulations. Thus, there is a stringent need for the underlying simulator to have an energy consumption model, but NS-3 currently does not have a LTE UE energy expenditure module. In literature, the LTE UE energy expenditure is profiled and modeled for a commercial UE. A corresponding implementation of the same is needed in NS-3. In this paper, we present the design and implementation details of LTE UE energy model in NS-3 and then validate it by running various experiments. Our implementation of LTE UE energy consumption model yields the expected power profile in our experiments with varying scheduling of resources to UEs. We made the LTE UE energy module code open  for the research community to get benefited.
Discrete and continuous band-limited signal extrapolation

This paper has two main purposes. First, some new algorithms for the extrapolation of multidimensional band-limited sequences are presented. These algorithms extend those given in  in two ways: 1) We do not impose any restrictions on either the shape of the region containing the set of samples of the two-dimensional signal to be extrapolated or on the shape of its passband zone. 2) We obtain a class of sequences which are band-limited extrapolations of the given data (including the minimum norm solution of  as a special case). The second objective of out paper is to relate the discrete extrapolation problem to the continuous signal extrapolation problem . Specifically, we prove that the solution obtained by using our approach for the discrete extrapolation problem tends to the solution of the continuous problem when the sampling rate used in the known part of the continuous signal to be extrapolated approaches infinity.
A noiseless quantum optical memory at room temperature

A quantum optical memory (QM) is a device that can store and release quantum states of light on demand. Such a device is capable of synchronising probabilistic events, for example, locally synchronising non-deterministic photon sources for the generation of multi-photon states, or successful quantum gate operations within a quantum computational architecture , as well as for globally synchronising the generation of entanglement over long distances within the context of a quantum repeater . Desirable attributes for a QM to be useful for these computational and communicational tasks include high end-to-end transmission (including storage and retrieval efficiency), large storage-time-bandwidth product, room temperature operation for scalability and, of utmost importance, noise free performance for true quantum operation.
Connected Line Drawing Extraction from a Perspective View of a Polyhedron

To extract line drawings with positional information from perspective veiws of three-dimensional objects is essential in image analysis and understanding. A new heuristic-search algorithm driven by a priori knowledge contained in a world model is presented which extracts a connected line drawing from a perspective view of a polyhedron. A main feature of our algorithm is that the search is concentrated on local areas centered at corners found with a corner finder. Therefore, the search time is significantly reduced and so are the positional errors in the extracted line drawing. An iterative process removes the false corners and lines and thus guarantees that our algorithm will work stably and reliably even in a noisy environment. Experimental results are presented.
CAPLIM: a Visual Basic program to calculate the capillary limit of an axially-grooved heat pipe

The program CAPLIM predicts the capillary limit of an axially-grooved heat pipe as a function of working temperature and heat pipe geometry. Calculations for water, ethanol, and ammonia are built into the program, and a user-defined function is provided to allow for the addition of other working fluids. The thermal-fluid properties of the working fluids are approximated by polynomial curve fits as functions of temperature. The Visual Basic programming language incorporated into Microsoft EXCEL (Version 5.0a) is used to perform the calculations and plot the capillary limit as a function of temperature. A sample calculation is provided to ensure proper operation of the program. A listing of the program code is available which includes a variable dictionary and an explanation of the program flow. This program can be used as a design tool to quickly evaluate potential heat pipe/working fluid combinations.
60 GHz polarimetric MIMO sensing: Architectures and technology

Millimeter-Wave (mm-W) is considered a potential technology for high-data rate wireless transmission and for high-resolution short-range radar, due to the 7-9 GHz bandwidth at the 60 GHz unlicensed band available worldwide. Developing ultrawideband architectures including multiple-input-multiple-output (MIMO) antenna systems at mm-W offer many advantages including jointly optimized analogue and digital signal processing at carrier frequency and baseband. This allows for flexible antenna designs and reduced losses, as many passive structures can be avoided at both sides of the link. Besides, based on flexible polarimetric approaches, the polarimetric propagation of electromagnetic waves can be exploited. In this paper we present a 60 GHz polarimetric MIMO system architecture, which includes analogue miniaturized frontends designed and manufactured by multi-layer packaging technologies. Such architecture permitted the design of compact MIMO radar and multi-dimensional channel sounding. The MIMO approach allows not only polarimetric filtering and fully polarimetric/directional signal processing to increase the signal-to-clutter-plus-noise ratio of mm-W radar systems, but also the full characterization of wireless channels including multipath with orthogonal polarizations.
A novel circuit for the evaluation of thermal impedance characteristics of MOS integrated circuits

The MOS thermal impedance test circuit (MOST) is a simple device for evaluating thermal impedance values using the electrical test method. Results are presented for bipolar. CMOS, and NMOS devices. The data presented show that the use of the MOST circuit is a viable method for procuring average thermal impedance values. It provides a low-cost alternative to integrated systems and can be duplicated for multiple test setups. In a large-scale test area, many of the circuits can be used for simultaneous testing, dedicating one (or more) circuit to each family of devices to be evaluated. In the manner, the measurement delay need only be set once for the initial lot and checked periodically for utmost accuracy.<<ETX>>
Advanced refractory layout of preheater vessels

The clinker burning process in modern kiln lines, with multi staged preheating towers under the use of high rates of alternative fuels and raw materials, needs special attention regarding several possible wear phenomena of refractory and the steel structure itself. Analyses of refractory installations with long term running time experiences of our worldwide operators, guided us to new concepts and layouts for special areas of preheating towers. Focussed on steel shell corrosion we give examples about the corrosion mechanism, and adapted refractory concepts are presented to avoid steel shell corrosion. An outlook is given about an advanced possible solution where the energy saving aspect is taken into account.
Automatic Video Annotation Using Multimodal Dirichlet Process Mixture Model

In this paper we infer a multimodal Dirichlet process mixture model from video data, the mixture components in this model follow a Gaussian-multinomial distribution. The multimodal Dirichlet process mixture model clusters freely available multimodal data in videos i.e., the combination of visual track and the corresponding keywords extracted from speech transcripts obtained from the audio track of videos, using the parameters of the model we build a predictive model that can output keyword annotations given video shots. In the multimodal Dirichlet process mixture model the keywords follow a multinomial distribution while the features used to represent the video shot follow a Gaussian distribution. We infer the multimodal Dirichlet process mixture model by collecting samples from the corresponding Markov chain using a blocked Gibbs sampling algorithm, and use the inferred parameters to predict video shot annotations that can be used to perform text based retrieval of shots. We compare the performance of our proposed model with other baseline models that use predicted annotations for retrieval.
Estimation of the Correlation Properties of Large Scale Parameters from Measurement Data

Interdependences of radio-channel model parameters, being observed in some measurement data, should be reproduced by the model. For that purpose the statistical correlation is often used. From the same wideband multiple-input and multiple- output (MIMO) channel data, estimated correlation between large-scale propagation parameters (e.g. delay spread and shadow fading) could be different due to non-uniqueness of post-processing procedure. In this paper, through examining a set of measurement data, we studied the impacts of differently parameterized post-processing procedures of measurement data on the auto- and cross-correlation properties of large scale parameters. We focus on the single parameter in postprocessing procedures: different margins of noise cutting level. The measurement data are gathered in a public hotspot bridge-to-car highway LOS scenario in Ulm, Germany.
Audio events detection based highlights extraction from baseball, golf and soccer games in a unified framework

We developed a unified framework to extract highlights from three sports: baseball, golf and soccer by detecting some of the common audio events that are directly indicative of highlights. We used MPEG-7 audio features and entropic prior hidden Markov models (HMM) as the audio features and classifier respectively to recognize these common audio events. Together with pre- and post-processing techniques using general sports knowledge, we have been able to generate promising results dealing with the audio track that is dominated by audio mixtures and noisy background.
Estimating three-dimensional motion parameters of a rigid planar patch, III: Finite point correspondences and the three-view problem

Two results are presented in this paper. First, it is shown that in estimating three-dimensional motion of a rigid planar patch, the eight pure parameters used in  and  are uniquely determined from the image correspondences of four points, no three collinear, and can be estimated by solving a set of linear equations. The second result concerns the three-view problem. It is proved that given four image point correspondences in three perspective views of a planar patch undergoing general three-dimensional rigid body motion, the number of solutions for the motion parameters is one, as opposed to two [2] when only two perspective views are given.
A novel approach to expression recognition from non-frontal face images

Non-frontal view facial expression recognition is important in many scenarios where the frontal view face images may not be available. However, few work on this issue has been done in the past several years because of its technical challenges and the lack of appropriate databases. Recently, a 3D facial expression database (BU-3DFE database) is collected by Yin et al.  and has attracted some researchers to study this issue. Based on the BU-3DFE database, in this paper we propose a novel approach to expression recognition from non-frontal view facial images. The novelty of the proposed method lies in recognizing the multi-view expressions under the unified Bayes theoretical framework, where the recognition problem can be formulated as an optimization problem of minimizing an upper bound of Bayes error. We also propose a close-form solution method based on the power iteration approach and rank-one update (ROU) technique to find the optimal solutions of the proposed method. Extensive experiments on BU-3DFE database with 100 subjects and 5 yaw rotation view angles demonstrate the effectiveness of our method.