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In multi-sensor spatial registration process, the ill-posedness of the information matrix is the main factor which affects the quality of the registration result. This paper focuses on this problem and makes some progress. For simplicity and without loss of generality, we firstly revisit the least square registration algorithm and analyze the ill-posedness of the information matrix and its reasons...
This work proposed a motion estimation method for a flexible robotic manipulator with a vision-based end-effector. The effectiveness of the proposed estimation method was evaluated by utilizing a non-linear dynamic model of a flexible manipulator using the co-rotational finite element method. This modeling utilized multiple co-ordinate (co-rotational) systems which rotated and translated with each...
Multi-pulse fuel injection in diesel engines enables a large flexibility in controlling the fueling profile, such that the engine performance can be maintained subject to disturbances, i.e., ambient condition changes and fuel injection deviations. Based on linearized systems, current fuel injection controller synthesis methods do not consider ambient condition changes as well as the nonlinear impact...
An electromagnetism scattering characteristics of Stealth target is a base for bistatic radar design. To study anti— stealth technology of bistatic radar, the radar cross section(RCS) of F-22 are calculated and measured by a true contrail. The simulation conclusion is accordant with the theory. Some valuable data can be provided as the theoretical bases for the design of anti-stealth radar systems.
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction...
The high-accuracy retrieval of sea remote sensing information, such as wind field, wave height and Permittivity, is determined by the microwave scattering model at the sea surface. Thus it is meaningful to study the accurate microwave scattering characteristic of rough sea surface. Based on the current Two-Scale model, this paper modifies the model of microwave scattering from three aspects:the correction...
This paper reviews the emergence and progress of phosphorene FETs, all within about a year. In such a short time, back-gated FETs evolved into top-gated FETs, gate length was reduced to the sub-micron range, passivation by high-k dielectrics or hexagonal boron nitride was demonstrated with temporal, thermal and mechanical stability, ohmic contact was achieved down to cryogenic temperatures, and cutoff...
With the application of multiple-pulse fuel injection profiles, the performance of diesel engines is enhanced in terms of low fuel consumption and low engine-out emission levels. However, the calibration effort increases due to a larger number of injection timing parameters. The difficulty of controlling the combustion phase also increases because of coupling between individual fuel injection pulses...
In this paper, the torque control problem for spark-ignition engines is considered. The objective is to provide good output torque tracking with minimum fuel consumption, while avoiding engine knock and misfire. To this end, three control strategies are proposed: a feed-forward controller with recalibrated engine maps, a PI control scheme and a model predictive controller. For the model predictive...
A broadband coplanar stripline was used in conjunction with a microfluidic channel for microwave sensing of live and dead biological cells with single-cell sensitivity and reproducibility. To facilitate sensing, AC dielectrophoresis was used to trap the cells between the stripline electrodes without electrode polarization. The measured dispersion of the scattering parameters were found to be proportional...
The article sets the urban area and 14 suburbs of Chengdu as the research object, along with selecting ten important indicators that influence the housing price, adopting the method of factor analysis and utilizing SPSS software, in order to analyze the housing price in Chengdu. Two representative indicators, i.e. the regional economic development as F1 and the regional fixed-asset investment as F2,...
The performance index of the radar signal processing system is the main technical specification to measure the working performance of the radar receiver. This paper designs a specified integrated tester for a reconnaissance radar. It mainly introduces the signal characteristics demand, overall plan, software testing flow, and the detection of the signal processing system of the device. The device...
Using a novel broadband microchamber, electrical detection of live and dead single cells was demonstrated. Tests on Jurkat cells showed that live cells had lower resistance but higher capacitance than that of dead cells. The test results were compared with the limited literature on broadband electrical detection of single cells and the discrepancies, both qualitative and quantitative, were discussed...
Detecting duplicate and near-duplicate documents is critical in applications like Web crawling since it helps save document processing resources. Simhash is a state-of-art method to assign a bit-string fingerprint to a document, such that similar documents have similar fingerprints. Finding the near-duplicates in a large collection of documents consists of two stages: (a) compute the simhash fingerprint...
In this paper, we study on Chinese text classification using character-based approach (N-gram) and word-based approach and propose the use of uni-gram, bi-gram and word features of length greater than or equal to three. A weight coefficient which can be used to give higher weights to word features is also introduced. We further investigate a serial approach based on feature transformation and dimension...
For the first time, intermodulation distortion of micro-electromechanical capacitive switches in the actuated state was analyzed both theoretically and experimentally. The distortion, although higher than that of switches in the suspended state, was found to decrease with increasing bias voltage but to depend weakly on modulation frequencies between 55 kHz and 1.1 MHz. This dependence could be explained...
Integer compression techniques can generally be classified as bit-wise and byte-wise approaches. Though at the cost of a larger processing time, bit-wise techniques typically result in a better compression ratio. The Golomb-Rice (GR) method is a bit-wise loss less technique applied to the compression of images, audio files and lists of inverted indices. However, since GR is a serial algorithm, decompression...
Due to the intermittent connectivity of content-centric opportunistic networks, data dissemination is often performed by replication which easily leads to network congestion. Many existing message forwarding or dropping strategies provide congestion avoidance based on only the node-related metrics or the message-related metrics, i.e. the meeting history between nodes, the number of subscribers, message...
An improved microchamber for electrical detection of biological cells was designed, fabricated and tested. The microchamber was formed between a gold coplanar stripline fabricated on a sapphire microscope slide and a single microfluidic channel fabricated in a polydimethylsiloxane cover. Compared with the previous design of a coplanar waveguide on a quartz slide with multiple microfluidic channels,...
In this paper, several sets of experiments were carried out to study the impact of word segmentation errors on automatic Chinese text classification. Comparison experiment of four word-based approaches was first carried out and the results show that the performance was significantly reduced when using automatic word segmentation instead of manual word segmentation which means errors caused by automatic...
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