nils-herrmann/clean_scirepeval huggingface dataset:
Coverage and capacity scaling laws in downlink ultra-dense cellular networks

Driven by new types of wireless devices and the proliferation of bandwidth-intensive applications, data traffic and the corresponding network load are increasing dramatically. Network densification has been recognized as a promising and efficient way to provide higher network capacity and enhanced coverage. Most prior work on performance analysis of ultra-dense networks (UDNs) has focused on random spatial deployment with idealized singular path loss models and Rayleigh fading. In this paper, we consider a more precise and general model, which incorporates multi-slope path loss and general fading distributions. We derive the tail behavior and scaling laws for the coverage probability and the capacity considering strongest base station association in a Poisson field network. Our analytical results identify the regimes in which the signal-to-interference-plus-noise ratio (SINR) either asymptotically grows, saturates, or decreases with increasing network density. We establish general results on when UDNs lead to worse or even zero SINR coverage and capacity, and we provide crisp insights on the fundamental limits of wireless network densification.
A connectionless multicast protocol for MANETs

In this paper, the connectionless multicast routing MCOM (Multipoint relay Connectionless Multicast) is introduced for mobile Ad hoc networks. MCOM adapts over a wide ranges of density of group members. It appears as unicast with few receivers and as flooding protocol, similar to Simplified Multicast Forwarding (SMF), with many receivers. MCOM utilizes the forwarding structure Multipoint relay (MPR) of the proactive unicast routing protocols as duplication points. In MCOM, addresses of MPRs are included in data packets instead of addresses of receivers as in the traditional connectionless multicast protocol Xcast. After receiving multicast packets from source, specific MPRs use SMF to deliver the packets to receivers. Two simulators NS-2 and nsclick were used to evaluate performance of protocols. The results from our studies demonstrate that MCOM is an efficient multicast protocols over a wide range of scenarios.
All-Optical Switches Based on Multiple Cascaded Resonators With Reduced Switching Intensity-Response Time Products

The general nonlinear behavior of multiple cascaded resonators is analyzed by using the coupled-mode theory in time and then compared to a single resonator from the viewpoint of optical bistable operation. Our analysis reveals that from the perspective of switching intensity, the multiple resonator structure is more advantageous than the single resonator with an equivalently increasing quality factor. It is also shown that a switching intensity-response time product, suggested as a performance metric for optical bistable devices, decreases linearly as the number of cascaded resonators increases. The effect of coupling n resonators is equivalent to a single resonator device with n-time increased quality factor in terms of the performance metric. The coupled-mode theory analysis is confirmed by a numerical study of the bistable operation of one-dimensional photonic crystal resonator structures using the finite-difference time-domain method.
A mutual inductance approach for optimization of wireless energy transmission

This work introduces a new approach of optimizing the efficiency of a wireless power transmission system in terms of mutual inductance. A circuit model was developed in PSpice to simulate the effect of mutual inductance by inductive coupling on power transfer efficiency. Experiments were conducted at 1.3 MHz with variations of distance between coils and coil sizes to change the mutual inductance in the equivalent circuit. Experimental results agreed well with the simulation model. The optimal mutual inductance to reach maximum power transfer efficiency for the inductive coupling system driven by a class-E amplifier was identified with respect to different coil sizes and distances. This method can guide the design strategy of the transmitter and receiver coils for specific applications.
An Experimental Study on Lexicalized Statistical Parsing for Vietnamese

Syntactic parsing is a central problem and a challenge in the field of natural language processing. It attracts many studies and consequently there exists the effective parsers for several popular languages such as English and Chinese. For Vietnamese parsing, there have been a few studies focusing on this problem, these studies lack of applying modern techniques, and no popular parser has been released. This paper presents the first study on developing a Vietnamese wide coverage parser based on lexicalized probabilistic context free grammar (LPCFG) and using a standard parsed corpus (similar to Penn Treebank). In this paper the Bikel's parser is modified to analyze Vietnamese. We also provide a comparison based on investigating different parsing models and different linguistic features. The best configuration achieves around 78\% of F-score.
0.33- mu m gate-length millimeter-wave InP-channel HEMTs with high f/sub 1/ and f/sub max/

The fabrication of 0.33- mu m gate-length AlInAs/InP high electron mobility transistors (HEMTs) is reported. These InP-channel devices have f/sub t/ values as high as 76 GHz, f/sub max/ values of 146 GHz, and maximum stable gains of 16.8, 14, and 12 dB at 10, 18, and 30 GHz, respectively. The extrinsic DC transconductances are as high as 610 mS/mm; with drain-source breakdown voltages exceeding 10 V. The effective electron velocity in the InP channel is estimated to be at least 1.8*10/sup 7/ cm/s, while the f/sub t/L/sub g/ product is 29 GHz- mu m. These results are comparable to the best reported results for similar InGaAs-channel devices.<<ETX>>
A Modified Sensorless Control Scheme for Interior Permanent Magnet Synchronous Motor Over Zero to Rated Speed Range Using Current Derivative Measurements

This paper proposes a modified sensorless control technique for an interior permanent magnet synchronous motor over its full-speed range based on current derivative measurements and fundamental pulsewidth modulation excitation (FPE). The proposed method employs measurement of the current derivative at only one active-voltage vector at low speeds, and at one active-voltage vector and one zero-voltage vector at medium and high speeds during each pulsewidth modulation (PWM) cycle, in contrast to two active- and two zero-voltage vectors in the conventional FPE method. The theoretical analysis is developed based on the three-phase model of the machine. The rotor position and speed are estimated at PWM frequency. In addition, the selection voltage vectors for current derivative measurement as well as the pulse stretching scheme for extending and compensating the selected voltage vectors is proposed in order to improve the accuracy of the current derivative measurement and to minimize the current distortion. The experimental results show that the proposed method results in a considerable improvement of the estimation accuracy at low speeds, a significant reduction of current distortion compared to the conventional FPE method and a full-speed range operation from no load to full load.
Nitrobacter sp. extract mediated biosynthesis of Ag2O NPs with excellent antioxidant and antibacterial potential for biomedical application.

In this study, extracellular extract of plant growth promoting bacterium, Nitrobacter sp. is used for the bioconversion of AgNO3 (silver nitrate) into Ag2O (silver oxide nanoparticles). It is an easy, ecofriendly and single step method for Ag2O NPs synthesis. The bio-synthesized nanoparticles were characterized using different techniques. UV-Vis results showed the maximum absorbance around 450 nm. XRD result shows the particles to have faced centered cubic (fcc) crystalline nature. FTIR analysis reveals the functional groups that are involved in bioconversion such as C-N, N-H and C=O. Energy-dispersive X-ray spectroscopy (EDAX) spectrum confirms that the prepared nanoparticle is Ag2O NPs. Particle size distribution result reveals that the average particle size is around 40 nm. The synthesized Ag2O NPs found to be almost spherical in shape. Biosynthesized Ag2O NPs possess good antibacterial activity against selected Gram positive and Gram negative bacterial strains namely Salmonella typhimurium, Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae when compared to standard antibiotic. In addition, Ag2O NPs exhibits excellent free radical scavenging activity with respect to dosage. Thus, this study is a new approach to use soil bacterial extract for the production of Ag2O NPs for biomedical application.
A case for a generalized periodic broadcast server: design, analysis, and implementation

Periodic broadcast is an effective paradigm for large-scale dissemination of popular videos. Considerable research efforts have gone into designing many excellent periodic broadcast protocols in terms of minimizing the server network bandwidth and the client resources. However, there are only a few implementations of periodic broadcast protocols available. This is probably because little has been documented on how the memory and disk bandwidth resources of a periodic broadcast server should be allocated. In this paper, we present a generalized periodic broadcast server (GPBS) model that supports any periodic broadcast protocol. Based on this model, we formulate and solve a new optimization problem whose solution provides insights into the server s memory and disk resources allocation. We also discuss our prototype implementation of GPBS. Our work facilitates future implementation and deployment of many existing periodic broadcast protocols.
A control strategy for dynamic voltage restorer

This paper presents a configuration and a control strategy for dynamic voltage restorer (DVR). In order to compensate the voltage of each phase separately, a closed-loop PI control law in the d-q reference frame is proposed. The proposed method provides a fast response and effective sag compensation capabilities. In addition, in order to detect voltage sag, a linear Kalman filter is employed to estimate three-phase voltages. By using Kalman filter, the voltage sag can be detected faster than other conventional methods. Therefore DVR can compensate voltage sag quickly and accurately. The obtained results that are simulated in Matlab/ Simulink indicate that the proposed method can mitigate the balanced and unbalanced voltage sag types efficiently in the distribution networks.
A practical implementation of wireless sensor network based smart home system for smart grid integration

This paper presents a hardware design of smart grid home gateway that integrates smart home network to be compatible for smart grid integration. In this network, a Smart Grid Home Gateway can control the electrical appliances based on the programming schedule or data received from control center. Moreover, some low cost wireless transceivers for Smart Grid are investigated and a simple wireless network topology based on star routing protocol for Smart Grid Home Network is also proposed. Final, demonstration results display an actual SGHG prototype to verify the system.
An XY θz flexure mechanism with optimal stiffness properties

The development of optimal XY θz flexure mechanisms, which can deliver high precision motion about the z-axis, and along the x- and y-axes is highly desirable for a wide range of micro/nano-positioning tasks pertaining to biomedical research, microscopy technologies and various industrial applications. Although maximizing the stiffness ratios is a very critical design requirement, the achievable translational and rotational stiffness ratios of existing XY θz flexure mechanisms are still restricted between 0.5 and 130. As a result, these XY θz flexure mechanisms are unable to fully optimize their workspace and capabilities to reject disturbances. Here, we present an optimal XY θz flexure mechanism, which is designed to have maximum stiffness ratios. Based on finite element analysis (FEA), it has translational stiffness ratio of 248, rotational stiffness ratio of 238 and a large workspace of 2.50 mm × 2.50 mm × 10°. Despite having such a large workspace, FEA also predicts that the proposed mechanism can still achieve a high bandwidth of 70 Hz. In comparison, the bandwidth of similar existing flexure mechanisms that can deflect more than 0.5 mm or 0.5° is typically less than 45 Hz. Hence, the high stiffness ratios of the proposed mechanism are achieved without compromising its dynamic performance. Preliminary experimental results pertaining to the mechanism's translational actuating stiffness and bandwidth were in agreement with the FEA predictions as the deviation was within 10%. In conclusion, the proposed flexure mechanism exhibits superior performance and can be used across a wide range of applications.
A novel passive micromixer with trapezoidal blades for high mixing efficiency at low Reynolds number flow

In this paper, we propose a novel passive micromixer structure based on the effect of stretching-folding in both vertical and horizontal directions. The channel depth of the micromixer is tightened at two ends each mixing unit. The fluid flows are repeatedly twisted and bent from left to right and vice versa. With this special structure, our proposed micromixer can create vortices and transversal flow even at low Reynolds number. Therefore, it can efficiently mix low speed liquid flows, making it easy to be built into micro-devices. We conduct intensive simulation to evaluate the performance of our proposed mixer by using COMSOL Multiphysics package with Navier-Stokes, convection-diffusion equation and particle tracking method. The simulation results demonstrated that our micromixer may be the first device that is able to operate with high mixing efficiency independent of the Reynolds number in the range of 0.5 to 60. Especially, at very low Reynolds number the mixing efficiency of our proposed micromixer is 220-240% higher compared with those of rhombic mixer with branch channels and pure rhombic mixer.
A non-geometric method for inverse kinematics solution of a delta-structure ship motion simulator and its trajectory control

This paper presents a non-geometric method for solving the inverse kinematics of a ship motion simulation system having Delta structure as shown in Fig. 1, and then investigated the problem of path tracking control generally. As the complexity of the joint structure of this system, obtaining the inverse kinematics is difficult and computationally expensive and traditional methods such as geometric, iterative and algebraic seem not completely effective. So, author uses the ability of ANFIS (Adaptive Neuro-Fuzzy Inference System) to learn from training data, it is possible to create ANFIS with limited mathematical representation of the system. Simulation is carried out by Matlab to indicate that this method has the advantage of faster learning rate, higher identifying precision and better real-time ability. The purpose of trajectory control is to define a temporal motion law along a given geometric path. A method for trajectory control is presented which is based on a modified trapezoidal velocity profile (TVP), and velocity control method is proposed using a PID controller to ensure the end effector tracking the desired path with high precision. At last, a demo model is used to verify the feasibility of the method. The results of the paper are very useful for solving the inverse kinematics of manipulator as well as demonstrate the improved performance of controller combining between TVP and PID over conventional trajectory control - point to point type.
Building Population-Specific Reference Genomes: A Case Study of Vietnamese Reference Genome

The human reference genome is an essential tool for studying human genomes. The standard reference genome is constructed from genomes of a few donors. The 1000 genomes project has revealed a huge amount of genetic differences between diverse populations. It is therefore naturally questioned whether the standard reference genome can work well for all human genome studies or population-specific reference genomes are needed accordingly. In this paper, we present a pipeline for constructing and evaluating a population-specific reference genome. The pipeline was examined on building the Vietnamese reference genome from 100 Kinh Vietnamese genomes obtained from the 1000 genomes project. Experiments showed that the resulting Vietnamese reference genome was better than the standard reference genome at analyzing Vietnamese genomic data. It helped improve the quality of short reads mapping and genotype calling for Vietnamese genomes. The pipeline is applicable for building and evaluating other population-specific reference genomes. For the first time the Vietnamese reference genome, which is now available for further Vietnamese genome studies, was successfully built.
Decentralized constructive collision avoidance for multi-agent dynamical systems

This paper describes the principles of a decentralized framework for the guaranteed collision avoidance of Multi-Agent dynamical systems sharing a common working space. The results are constructive and can be effective in the certification of mission safety. The geometric aspects of the collision avoidance problem are exploited to define the control policies. The main contributions are related to the optimization-based decentralized feedback control which renders a so-called functioning zone controlled invariant. An illustrative example is analyzed in order to highlight the effectiveness of the proposed approaches.
A hydrophone using liquid to bridge the gap of a piezo-resistive cantilever

This paper reports on a hydrophone based on a structure in which liquid was used to bridge the gap between a piezoresistive cantilever and the surrounding walls. Due to surface tension, the liquid filled the cantilever's gap while it did not leak through the microscale gap. Evaluation experiments showed that the combination of liquid bridge and cantilever enables the hydrophone to have high sensitivity. Being compact, high sensitivity, low cost, simple fabrication process, the hydrophone is promisingly widely applied in under water communication system and medical field.
Avoiding local minima in entropy-based SAR autofocus

This paper explores the problem of avoiding local minima solutions in entropy-based synthetic aperture radar (SAR) autofocus. These autofocus algorithms correct defocused SAR images by determining the phase error estimate that produces the image with minimum entropy. However, the optimization strategy may converge to local minima solutions that correspond to incorrect image restorations. We propose two methods for reducing the likelihood of achieving such solutions. The first is a novel wavelet-based decomposition technique that determines the neighborhood of the global entropy minimum. A second strategy is the application of simulated annealing techniques to the optimization. We explore the performance of these methods using simulated SAR data, and provide a justification for how they work. Worst case phase errors in which the phase is random and uncorrelated between elements are considered.
A New Approach to Modeling Hysteresis in a Pneumatic Artificial Muscle Using The Maxwell-Slip Model

Two main challenges in using a pneumatic artificial muscle (PAM) actuator are the nonlinearity of pneumatic system and the nonlinearity of the PAM dynamics. The latter is complicated to characterize. In this paper, a Maxwell-slip model used as a lumped-parametric quasi-static model is proposed to capture the force/length hysteresis of a PAM. The intuitive selection of elements in this model interprets the unclear, but blended contributing causes of the hysteresis very well, which are assumed to originate from the dry friction of the double helix weaving of the PAM braided shell, the friction of the weaving and the bladder, the elasticity of the bladder and/or the deformation of the conical parts of a PAM close to the end caps. The obtained model is simple, but physically meaningful and easy to handle in terms of control.
Design of novel grid-tied solar — Wind hybrid power plant using photovoltaic cell emulating system

The utilization rate of the power conditioner in the grid-tied solar power system is low because the operation of photovoltaic (PV) cell depends on the sunlight. Adding the small scale wind power generating system to the existing solar power system can increase the utilization rate of the power conditioner. In this paper, we propose a novel design method by which the small scale wind power generating system can connect to the grid-tied power conditioner of solar panel and hybrid power system can transmit power to the utility grid.
Compositional Dependence of the Young’s Modulus and Piezoelectric Coefficient of (110)-Oriented Pulsed Laser Deposited PZT Thin Films

In this contribution, we report on the compositional dependence of the mechanical and piezoelectric properties of Pb(ZrxTi1-x)O3 (PZT) thin films fabricated by pulsed laser deposition (PLD). These films grow epitaxially on silicon with a (110) preferred orientation and have excellent piezoelectric properties, which make them outstanding candidates for application in microelectromechanical system devices. Vibrometric measurements on capacitors showed that the effective longitudinal piezoelectric coefficient (d33,f) of 100-nm thick PZT films has a maximum value of 72 pm/V for a composition of x = 0.52. The Young's modulus was determined by measuring the difference in the flexural resonance frequencies of cantilevers before and after the deposition of the PZT thin films. The compositional dependence of the Young's modulus shows an increase in value for the Zr-rich compositions, which is in agreement with the trend observed in their bulk ceramic counterparts. From the obtained dielectric constant and d33,f, we show that the calculated coupling coefficients of the PLD-PZT thin films have higher values for most of the compositions than their ceramic counterparts.
Automatic Anonymization of Natural Languages Texts Posted on Social Networking Services and Automatic Detection of Disclosure

One approach to overcoming the problem of too much information about a user being disclosed on social networking services (by the user or by the user's friends) through natural language texts (blogs, comments, status updates, etc.) is to anonymize the texts. However, determining which information is sensitive and should thus be anonymized is a challenging problem. Sensitive information is any information about a user that could be used to identify the user. We have developed an algorithm that anonymizes sensitive information in text to be posted by generalization. Synonyms for the anonymized information are used as fingerprints for detecting a discloser of the information. The fingerprints are quantified using the modified discernability metric to enable an appropriate level of anonymity to be used for each group of the user's friends. The fingerprints cannot be converted into another one to incorrectly identify a person who has revealed sensitive information. Use of the algorithm to control the disclosure of information on Facebook demonstrated that it works well not only in social networking but also in other areas (health, religion, politics, military, etc.) that store sensitive information.
Combination of Features for Vietnamese News Multi-document Summarization

The aim of multi-document summarization is to produce an abridged version which contains important information from a set of documents on the same topic. This paper describes an approach that incorporates a set of features at word and sentence level to extract important sentences from input documents for Vietnamese news multi-document summarization system. Then, the summaries are evaluated automatically by using the ROUGE measure. The obtained result indicates that this approach produces good summaries and is appropriate for Vietnamese as well as languages limited linguistic resources.