nils-herrmann/clean_scirepeval huggingface dataset:
A fusion scheme of visual and auditory modalities for event detection in sports video

In this paper, we propose an effective fusion scheme of visual and auditory modalities to detect events in sports video. The proposed scheme is built upon semantic shot classification, where we classify video shots into several major or interesting classes, each of which has clear semantic meanings. Among major shot classes we perform classification of the different auditory signal segments (i.e. silence, hitting ball, applause, commentator speech) with the goal of detecting events with strong semantic meaning. For instance, for tennis video, we have identified five interesting events: serve, reserve, ace, return, and score. Since we have developed a unified framework for semantic shot classification in sports videos and a set of audio mid-level representation with supervised learning methods, the proposed fusion scheme can be easily adapted to a new sports game. We are extending this fusion scheme to three additional typical sports videos: basketball, volleyball and soccer. Correctly detected sports video events will greatly facilitate further structural and temporal analysis, such as sports video skimming, table of content, etc.
A new real-time robust object tracking method

In this paper, we propose a real-time robust object tracking method that is based on a generative visual appearance model but with some level of background awareness. We introduce several strategies to ensure a stable visual appearance model for the target as tracking progresses. The strategies include modeling of a foreground color distribution, maintaining a set of foreground templates with the target region emphasized, and incorporating background templates into the dictionary for sparse representation of the target appearance. Experimental results demonstrate that our method outperforms several latest state-of-the-art tracking methods in terms of tracking performance.
Synchronous retrieval of forest canopy cover by airborn LiDAR and optical remote sensing

Forest canopy cover is retrieved Synchronous by the airborne LiDAR data and SPOT-5 HRG data, using the method of linear spectrum decomposition model combined with Li-Strahler geometric-optical model. First, the airborne LiDAR data is used to retrieve forest parameters and then the proportion of pixel not covered by crown or shadow Kg of each pixel in the sample was calculated using Li-Strahler geometric-optical model, while the linear spectrum decomposition model is used to extract the proportion of pixel not covered by crown or shadow Kg of each pixel in the whole imagery.
Arterial speed studies with taxi equipped with global positioning receivers as probe vehicle

The paper describes a new methodology for performing arterial speed studies using taxis equipped GPS receivers as probe cars. It documents the data collection and data reduction, as well as analyses that illustrate the capabilities of the GPS/GIS methodology. The data collection procedure uses taxis equipped with GPS receivers to automatically collect time, local coordinates, and speed at regular sampling periods, for example every one second. The data reduction procedure filters and aggregates GPS data to compute travel time and speed along highway segments. Finally, the developed methodology is implemented with 100 taxis equipped with GPS receivers of Guangzhou City. The results demonstrate the power of the methodology proposed in this paper on travel time.
Accurate modeling noise characteristic of microwave field-effect transistor

In this paper, a new method based support vector regression (SVR) is introduced for modeling noise parameters of FETs. Support vector machines (SVMs), which are based on the structural risk minimization (SRM) principle, have powerful generalization ability, and can handle problems with finite samples . By using the proposed method, the effect of the measurement errors can be excellent treated with. As a result, the noise characteristics of FETs can be accurately predicted with a few measurements. The SVR based modeling method about bias and frequency dependences of noise parameters is developed.  Experimental results are given out to validate the proposed methods.
Isolation Purification and Some Properties of Alkaline Phosphatase from Hypophthalmichthys Molitrix Cuv.et Val

Abstracted by Tris-HCl buffer,pH8.5, treated by n-butanol, and fractioned by (NH4)2SO4 (60%) ,the alkaline phosphatase( AKP) from guts of Hypophthalmichthys molitrix Cuv.et Val was separated through DEAE-Sepharose and Sephacryl S-200. The purification folds was 150.08,while the specific activity was 4031.15 U/mg.The properties research suggested that the optimal pH and temperature were pH10.2 and 40degC respectively,and the AKP was unstable when the pH was out of range of pH7 to pH12, or the temperature was higher than 50degC.The data showed the Km value of the AKP was 4.73 mmol/L. Also,some ions had effect on the activity of AKP,such as Mg2+ which activated the AKP and Zn2+ which inhibited the AKP.
Mechanical system and stable gait transformation of a leg-wheel hybrid transformable robot

This paper proposes a novel and mechanically decoupled leg and wheel hybrid transformable robot called HyTRo-I that combines the fast speed of wheeled vehicles on a flat ground and the high degree of flexibility of legged robots over irregular terrains. According to different terrain conditions, HyTRo-I can choose from three motion modes: wheeled rolling, quadrupedal walking mode and leg-wheel hybrid mode. By shifting among these moving patterns, the mobility of HyTRo-I over various surface conditions can be fully realized. While the control technology of actuating the wheeled vehicles is mature and simple, the control of quadruped walking is an area of active research. Therefore, we develop a statically stable gait controller for our robot. In addition, we study the locomotion mechanism of transformation that concerns the feasibility of three moving methods of HyTRo-I. By the mutual transformation gaits illustrated in details, HyTRo-I can be smoothly and reciprocally transformed between wheeled rolling mode and quadrupedal walking mode. Finally, we experimentally test the mode transformations of HyTRo-I.
A micromachined 805 GHz rectangular waveguide filter on silicon wafers

In this letter, a WR-1.0 rectangular waveguide band-pass filter is designed, which is fabricated using the deep reactive ion etching (DRIE) micromachining on silicon wafers. The filter consists of four inductive irises. Using Ansoft HFSS, the center frequency of the filter is at 805GHz and the insertion loss is about 1.5 dB within the 21GHz bandwidth. Effects of the DRIE process brought to the filter performance are also discussed.
A Cultivation Technique of Direct Seeding Rice Adapted to Cold Soaked Mud Field in the Mountains Southwest Hubei

The S-W Hubei area is located in the southwest of Hubei, with high-elevation terrain, unique climate, and lots of cold soaked fields. On account of the environmental characteristics of cold soaked mud fields, the procedure of direct seeding cultivation within ridging and plastic film mulching was introduced. The application of this technique can exalt the tiller node, increase the available soil nutrients of cold soaked mud fields, and improve the economic structure and the technical effect of yield, and the corresponding recommendations on the application of mechanical support, economic cost and technical standard were made.
A 650 GHz broadband 3dB coupler using a bridged PPDW

In this paper, a 650GHz broadband 3dB directional coupler with very flat coupling based on bridged parallel plate dielectric waveguide (PPDW) is presented. In the uniform coupling section, a bridge structure between the two PPDWs is employed to obtain accurate coupling value and achieve a broadband coupling. And in the transition sections, two quarter-circle bend arms are introduced to achieve strong isolation between the adjacent ports and reduce the power reflection in all ports. It is found that this new type of bridged coupler exhibits excellent performance at terahertz frequencies. Calculated results show that return loss is greater than 18dB, isolation is better than 27dB, and the average coupler loss is 1.3dB, over a percentage bandwidth of 6.2% at 650GHz. Compared to the conventional PPDW coupler, the bridged PPDW coupler shows significantly greater bandwidth (about 2.3 times), compact and mechanically stable with a much shorter uniform coupling length (reduced about 56%), which may have potential applications for terahertz integrated circuits and systems.
Steering wheel boundary feature extraction based on contour fusion for long-distance bus

Abnormal driving behavior monitoring and precaution is one of the important parts of advanced driver assistance systems (ADAS). This paper developed a boundary feature extraction algorithm based on contour fusion for steering wheel. The image pre-processed method including median filter, histogram equalization and gray level stretching were used. Boundary feature of steering wheel was extracted by using adapted Sobel operator and image was binarized with Otsu algorithm base on subimage. Contour fusion method was utilized to detect whole boundary of steering wheel. Experimental results show that the algorithm has good adaptability to illumination changing, better robustness and less computation, which lay a stable basis on intelligent analysis of abnormal driving behavior for long-distance bus.
Compact hybrid broadband GaN HEMT power amplifier based on feedback technique

A broadband hybrid power amplifier using a gallium nitride (GaN) high electron mobility transistor (HEMT) is presented. A discrete GaN HEMT bare die with 1.25 mm of gate width is used, and a compact size of 8.3 × 12.7 mm is achieved by using a feedback technique based on lumped elements. The power amplifier operates from 100 to 1000 MHz, and shows more than 12.8 dB gain and higher than 30.7 dBm output power in the overall bandwidth. Power added efficiency of 61.3% was acquired at the mid-band frequency and more than 54.5% throughout the bandwidth.
A novel forward single-stage single-switch power factor correction AC/DC converter

This paper proposes a novel forward single-stage single-switch power factor correction AC/DC power converter. The proposed topology adds an inductor, transformer windings and diodes into a forward converter. The input current satisfies IEC 1000-3-2 Class D standards with output voltage quickly regulated, and the storage capacitor voltage can be low enough. This paper gives out detailed theoretical analysis and experimental results, which confirm the predicted performance of the proposed topology.
An improved nonlinear thermal resistance extraction method for AlGaN/GaN HEMTs

In this paper, a novel nonlinear thermal resistance extraction method for Gallium Nitride (GaN) high electron-mobility transistors (HEMTs) is presented. Pulsed I-V measurements were performed at different ambient temperatures to extract the relationship between transistor's channel currents and channel temperature under various power dissipations. The temperature-dependent access resistances which play a vital role to the channel currents was also extracted. By using the extracted current-temperature relationship and access resistances, current differences between DC I-V and pulsed I-V were translated into channel temperature differences versus device power dissipations, from which the nonlinear channel thermal resistance was determined. This extraction method was applied to a 400 μm gate widths GaN HEMTs. Finite element analysis (FEA) was also employed for the verification purposes. Results show that this extraction approach can provide accurate power-dependent thermal resistance which is important for GaN HEMTs modeling and reliability assessment.
Chromatic surface microstructures on bionic soft robots for non-contact deformation measurement

This paper presents a bionic soft robot with chromatic surface micro-structure (CSM), as a new approach for the measurement of body deformation of the soft robots. Firstly, the CSM films are fabricated by diffraction gratings mold using material polydimethylsiloxane (PDMS). Then, the CSM films are attached to the surface of the soft actuators based on shape memory alloy (SMA) wires. By recording and matching the pattern through two cameras, the continuous deformation curvature degrees of SMA soft actuators are attained. Finally, by integrating three actuators mentioned previously, a bio-inspired prototype of three-legged soft robot is manufactured to carry out motions of both freely and grasp obstacles. By recording and matching the pattern of the robot, we demonstrated a non-contact deformation measurement for flexible devices. As a new non-contact measurement method for body deformation of soft robots, it may shed some light on the issues of the soft robots' sensing and controlling in the future.
A Ka-band high isolation and in phase planar six way power divider based on LTCC technology

In this paper, a Ka-band in-phase high isolation planar six way power divider is designed and simulated. This six way power divider is realized using stripline on Low Temperature Co-fired Ceramic (LTCC) substrate. From 34GHz to 36 GHz, the isolation between all outputs are far better than 20 dB. The average insertion loss is 8.38 dB. It has a maximum phase difference of 6 degrees.
An op amp-less band-gap voltage reference with high PSRR and low voltage

With the trend of low-power, low-voltage in IC design, conventional band-gap voltage reference will not be the most suitable candidate anymore. In this paper, an op amp-less band-gap voltage reference is designed in 0.35um 5V/3.3V CMOS process. After the principle and stability of the voltage reference is introduced, the power supply noise rejection ratio (PSRR) and temperature coefficient in low voltage supply are analyzed too. The simulation results indicate that the temperature range is −40□ to 125□, the reference voltage is 1.166V–1.171V and the PSRR is 104dB at 1KHz when the supply voltage range is 2.5V±10% So the proposed op amp-less band-gap reference has the features of high-PSRR, low-voltage and low temperature coefficient. It is very suitable to be applied in low voltage ADC and DAC.
New techniques of remote sensing in the university of architecture and planning

Expatiated on the education program setting, characteristics, aims and contents of new remote sensing technology in the university of such architecture and planning in China. Mainly introduced three kinds of training plans of new remote sensing techniques which are designed for RS, GIS and Geomatics program, namely training plan of satellite remote sensing application, training plan of terrain remote sensing application and training plan of integrated RS, GPS and GIS technique application, and five practices of these training plans, meanwhile, presented five successful application examples for these practices of training plans, which worked by single student or a team of students.
Study on on-ramp control strategy of urban freeway based on fuzzy control

The on-ramp control strategies are classified after expounding mechanism of ramp control strategies of urban freeway. The applicability is summarized respectively based on advantages and disadvantages of each strategy. A new on-ramp control method of urban freeway is proposed by using the fuzzy control algorithm and the support vector machine algorithm, which can satisfy with demands which ramp control strategies should change with real-time changing of traffic condition. At last, some ramp control strategies are given by using control algorithm in this paper, based on the survey data of a main road in Guangdong province. The new control strategies and previous control strategies are applied to ramp control respectively, and new control strategies can satisfy dynamic changes of traffic condition by analyzing survey data, and have a better effect on the on-ramp control than old control strategy.
Three-Level Bidirectional Converter for Fuel-Cell/Battery Hybrid Power System

A novel three-level (3L) bidirectional converter (BDC) is proposed in this paper. Compared with the traditional BDC, the inductor of the 3L BDC can be reduced significantly so that the dynamic response is greatly improved. Hence, the proposed converter is very suitable for fuel-cell/battery hybrid power systems. In addition, the voltage stress on the switch of the proposed converter is only half of the voltage on the high-voltage side, so it is also suitable for high-voltage applications. The operation principle and the implementation of the control circuit are presented in detail. This paper also proposes a novel bidirectional soft-start control strategy for the BDC. A 1-kW prototype converter is built to verify the theoretical analysis.
Wideband waveguide to microstrip probe transition with LTCC technology

A novel broadband waveguide to microstrip probe transition based on low-temperature co-fired ceramic (LTCC) technology is presented and experimentally verified for the first time. To improve the bandwidth and impedance matching, a multilayer step-shape matching structure beneath the probe is buried in the LTCC substrate, which is implemented by installing conducting ground strips on different substrate layers connected by the staggered via side walls. A waveguide to microstrip probe transition is fabricated to verify the design with compact size. Measured results show good agreement with simulated results.
A Novel Six Bit Phase Shifter for the Ku Band

A novel 15-GHz six-bit digital phase shifter has been proposed. The developed phase shifter has been realized in a hybrid MIC technique with PIN diodes as switching elements. The circuit consists of four bits realized as periodically loaded-line and two bits based on novel switched-line with loaded-line. All of six bits have special tuning elements for the fine tuning of the required phase shift. The insertion loss for the 64 phase states is 5.2dBplusmn1.1 dB over the operating bandwidth of 14.9-15.1GHz, and the phase error for the 64 phase states is not greater than 3.4 degrees at the designed center frequency of 15GHz.
A novel W-band ultra-wideband substrate integrated waveguide (SIW) T-junction power divider

A novel w-band ultra-wideband SIW power divider is presented. This ultra-wideband power divider utilizes substrate integrated waveguide (SIW) such that the overall size is largely reduced by half. SIW belongs to a sort of closed power splitter structure can effectively evade cavity resonance problem caused by W-band power divider. The power divider uses traditional T-junction Wilkinson structure. A novel method by setting the appropriate cut-off frequency, either complete the W-band power distribution, but also isolate the low harmonics (60GHz in this design) at the same time. A very broad bandwidth from 80GHz up to 100GHz is obtained. In the meanwhile, output return loss is better than -15dB by EM simulation.
Aeroelastic Analysis of a Supersonic Fin Based on CFD/CSD Coupling

The main goal of this paper is to analyze the flutter boundary and dynamic load of a supersonic fin. Reduced order mode (ROM) based on Volterra Series is presented to calculate the flutter boundary, and CFD/CSD coupling is used to compute the transient aerodynamic load. The Volterra-based ROM is obtained using the derivative of unsteady aerodynamic step-response, and the infinite plate spline is used to perform interpolation of physical quantities between the fluid and the structural grids. The results show that inertia force plays a significant role in the dynamic load, the moment cause by inertia force is lager than the aerodynamic force, because of the huge dynamic load, structure may be broken by aeroelasticity under the flutter dynamic pressure.
The BCGS-FFT method for electromagnetic scattering from inhomogeneous objects in a planarly layered medium

An iterative method, the stabilized biconjugate gradient fast Fourier transform (BCGS-FFT) method, combined with the FFT is developed for solving electromagnetic (EM) scattering from inhomogeneous objects embedded in a planarly layered medium. The CPU time and memory cost of this BCGS-FFT method is O(NlogN) and O(N), respectively, significantly more efficient than both direct and iterative solutions of the method of moment. As a result, this method is capable of solving large-scale EM scattering problems in a planarly layered background.
Research on conformance testing method for 6LoWPAN neighbor discovery protocol and system implementation

Protocol conformance testing can be used to detect whether protocol implementations are conform to the protocol specification. 6LoWPAN neighbor discovery protocol is designed for neighbor discovery and address registration in low-power WPAN. In order to accomplish the conformance testing for this protocol, formal methods are introduced to model the entities in the protocol and an enhanced algorithm is proposed to generate test sequences. Then, based on TTCN-3 architecture, a conformance testing system is implemented. The result indicates the generated test sequences are shorter with less redundancy. The system can perform conformance test properly, and thus provide reference for the development of 6LoWPAN protocol testing system.
Simplified phase noise model for negative-resistance oscillators and a comparison with feedback oscillator models

This paper describes a greatly simplified model for the prediction of phase noise in oscillators which use a negative resistance as the active element. It is based on a simple circuit consisting of the parallel addition of a noise current, a negative admittance/resistance, and a parallel (Q-limited) resonant circuit. The transfer function is calculated as a forward trans-resistance (VOUT/IIN) and then converted to power. The effect of limiting is incorporated by assuming that the phase noise element of the noise floor is kT/2, i.e., -177 dBm/Hz at room temperature. The result is the same as more complex analyses, but enables a simple, clear insight into the operation of oscillators. The phase noise for a given power in the resonator appears to be lower than in feedback oscillators. The reasons for this are explained. Simulation and experimental results are included.
A survey of biologically inspired chemical plume tracking strategies for single robot in 2-D turbulence dominated flow environments

A survey of biologically inspired chemical plume tracking strategies for single robot is presented. We focus on the 2-D turbulence dominated airflow environments. Olfactory-based mechanisms have been hypothesized for biological behaviors including foraging, mate-seeking, homing, and host-seeking. Server robots with such chemical plume tracking feats would have applicability in many dangerous or toxic searching tasks. In this paper, we classify the biologically inspired chemical plume tracking strategies for single robot in 2-D turbulence dominated flow environments into four types, namely chemotaxis-based, anemotaxis-based, infotaxis-based, and vision fusion-based. The advantages and disadvantages of the typical algorithms in each strategy are reviewed in detail. In final, further research directions in this area are presented.