Wyniki wyszukiwania - Biblioteka Nauki

1

Real-time face detection and pose estimation for driver monitoring

100%

Guo Z. , Yan Y. , Hua J. , Yang J.

Image Processing & Communications

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2006

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tom Vol. 11, no 2

83-96

EN

For a driver monitoring system, one of the most important problems to solve is face detection rapidly. This paper presents an efficient approach to achieve fast and accurate face detection in gray level videos. Candidates of face at different scales are selected by finding regions based on Mask Transform (MT). To obtain real one, all the face candidates are then verified by using support vector machines (SVMs) based on Multi-scale 2D Walsh-Hadamard features. Head pose is estimated on the basis of accurate face detection. At last, we analyzed the head pose by a kind of Bilateral-projection Matrix Principle Component Analysis (BMPCA) algorithm proposed. Experimental results on many videos show that the algorithm can detect driver's face rapidly and estimate the head pose accurately. The proposed method is robust to deal with illumination changes, glasses wearing and different head pose with moderate rotations. Experimental results demonstrate its effectiveness.

2

Hermite–Hadamard type inequalities for extended s-convex functions on the co-ordinates in a rectangle

100%

Xi B.-Y. , Hua J. , Qi F.

Journal of Applied Analysis

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2014

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tom Vol. 20, nr 1

29--39

EN

In the paper, the authors obtain some Hermite–Hadamard type integral inequalities for extended s-convex functions on the co-ordinates in a rectangle.

3

The characteristics of two-blade Submersible Mixers’ flow field inner the pool

88%

Fei T. , Weidong S. , Qihua Z. , Hua J. , Desheng Z.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 3b

236--241

EN

To study the flow pattern of submersible mixers inner the pool, the research uses FLUENT6.3 mainframe computational fluid mechanics software as well as RNG k –εturbulent model、SIMPLE algorithm and rigid-lid assumption to numerically simulate the two-blade submersible mixers inner the sewage treatment pool and also analyzes the velocity distribution inner big pool and the distributions of the flow field, pressure and the velocity circulation inner the mixers’ impellers. The results indicate that the fluid flow inner the pool belongs to high Reynolds number with large turbulence intensity; the fluid flow is complex, and there exists obvious big vortex; Coanda Effect and boundary-layer separation is also apparent. Clearly large vortex exists and the flow velocity near the blades is higher while the flow velocity of the pool’s surface and bottom takes the form of double parabolic distribution and is lower. The velocity gradient and pressure gradient are obvious from working face to the blade back; the flow velocity is lower and the pressure is higher near the working face of the blades, moreover, there are high velocity zone and negative zone in the blade back. The velocity in the axis surface inlet and outlet the blades is also parabolic distributed, and its circulation does not vary considerably; the velocity in the axis surface inlet and outlet the blades is distributed similar as the velocity in the isometric axis surface, and its velocity circulation follows a linear law distribution. It can guide submersible mixer hydraulic performance in design study, simulation and engineering application.

PL

W artykule przedstawiono wyniki badań dotyczących przepływu w mieszaczach zatapialnych, znajdujących się w basenie. W celu przeprowadzenia symulacji mieszacza dwułopatowego, wykorzystano m. in. oprogramowanie FLUENT6.3, model turbulencji k-epsilon, algorytm SIMPLE oraz założono sztywność wieka. Analizie poddano także rozkład prędkości i cieśnienia wokół wirnika mieszacza. Wyniki badań zostały omówione i przedstawione wnioski.

4

Determination of four kinds of endogenous hormones in poplar dialyzate by HPLC with microdialysis

88%

Jinlong M. , Guobin J. , Bo J. , Hua J. , Shanjing Y.

Acta Chromatographica

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2013

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tom Vol. 25, no. 4

627--637

EN

A dialyzate was obtained from the tender stems of living poplar (Populus wutunensis) by microdialysis (MD). Four kinds of endogenous hormones, namely, benzylamino purine, gibberellic acid, indole acetic acid, and abscisic acid, were then simultaneously determined by HPLC. The molecular weight cutoff (MWCO) of the MD probe was 30 kDa. The perfusion rate was 1 μL/min, and the perfusion liquid was Millipore-Q water. HPLC was performed using an Inertsil ODS-SP column. The mobile phase comprised 60:40 (v/v) methanol and water containing 0.2% phosphoric acid. The elution rate was 0.6 mL/min rate at 30°C. The average recoveries of the four kinds of hormones ranged from 93% to 109%, with correlation coefficients greater than 0.998. The determinations of endogenous hormones in plants as real time, living, and online were realized by MD-HPLC. The cells and macromolecules were excluded by the MD probe so centrifugation or protein precipitation was not required prior to analysis. MD-HPLC is a highly sensitive and selective method for the simultaneous profiling and quantification of a wide variety of plant hormone groups. This method is convenient for studying the mechanism of plant hormones.

5

Hydrothermal Synthesis and Crystal Structure of Cu3I3(C12H8N2)2

51%

Yu J. H. , Shi Z. , Xu J. Q. , Chu D. Q. , Jin W. J. , Ding H. , Hua J. , Xu J. N. , Cui X. B. , Wang T. G. , Zhang L. J. , Li C. B.

Polish Journal of Chemistry

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2001

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tom Vol. 75, nr 11

1785-1789