Wyniki wyszukiwania - Biblioteka Nauki

1

A cooperative stereo matching and occlusion detection algorithm for stereo coding

100%

Han J. , Lu Z.

Machine Graphics and Vision

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2004

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tom Vol. 13, No. 1/2

25-38

EN

This paper presents a novel stereo algorithm for obtaining disparity vectors with simply detected occluded points, which is adaptive to a stereo coding scheme. In this algorithm, we first propose a novel scheme based on an adaptive UT mesh model and an epipolar line constraint principle for stereo matching. Furthermore, a simple occlusion detection algorithm is introduced, which uses two fundamental concepts: the uniqueness assumption and the disparity gradient limit principle. Our technique first extracts some triangular vertices from a reference image using an improved adaptive Delaunay triangulation representation algorithm. As feature points, these vertices are matched in the target image with some correlation measurement. After obtaining the disparity vector of each vertex, the uniqueness assumption and the disparity gradient limit are used to select occluded points and label occluded regions. Thr disparity vectors of the points among the triangular vertices can be calculated by a six-parameter affine transformation. In terms of advantages for image coding of a DT mesh model, this algorithm is definitely appropriate for stereo coding, which has been proven by experimental results. We have applied this algorithm to some stereo images, and the experimental results show that the veracity of the disparity estimation given in this paper is higher than that of the conventional algorithms. What is more. some occluded points and occlusion regions can be easily detected with this algorithm. lu addition, the algorithm can achieve higher coding efficiency as compared to conventional stereo coding algorithms.

2

Rapid Simulation of Flat Knitting Loops Based On the Yarn Texture and Loop Geometrical Model

100%

Lu Z. , Jiang G.

Autex Research Journal

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2017

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tom Vol. 17, no. 2

103--110

EN

In order to create realistic loop primitives suitable for the fast computer-aided design (CAD) of the flat knitted fabric, we have a research on the geometric model of the loop as well as the variation of the loop surface. Establish the texture variation model based on the changing process from the normal yarn to loop that provides the realistic texture of the simulative loop. Then optimize the simulative loop based on illumination variation. This paper develops the computer program with the optimization algorithm and achieves the loop simulation of different yarns to verify the feasibility of the proposed algorithm. Our work provides a fast CAD of the flat knitted fabric with loop simulation, and it is not only more realistic but also material adjustable. Meanwhile it also provides theoretical value for the flat knitted fabric computer simulation.

3

Decision-theoretic Rough Sets in Incomplete Information System

80%

Yang X. , Lu Z. , Li T.-J.

Fundamenta Informaticae

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2013

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tom Vol. 126, nr 4

353--375

EN

Decision-theoretic rough sets in two kinds of incomplete information systems are discussed in this paper. One is for the classical decision attribute and the other for the fuzzy decision attribute. In complete information system, the universe is partitioned with the equivalence relation. Given a concept, we get a pair of approximations of the concept using rough set theory, and the universe can be partitioned into three regions for making a decision. An incomplete information table can be expressed as a family of complete information tables. The universe is partitioned by the equivalence relation for each complete information table. The probability of each object belonging to the concept can be calculated in a completion from incomplete information system, and then the total probability of the object belonging to the concept can be obtained. Decision rules are derived using total probability instead of conditional probability in decision-theoretic rough sets. Finally, the universe is divided into three regions according to the total probability. A similar approach to fuzzy incomplete information system is examined and the universe is also divided into three regions.

4

The Dynamic Model of Closed-Loop Supply Chain with Product Recovering and its Robust Control

80%

Qiu R. , Huang X. , Lu Z.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 9b

1-4

EN

In recent years, closed-loop supply chain (CLSC) operation has been an important method to recover waste materials and products for resource conservation and environmental protection and paid more attention in industry and academia. We establish a dynamic model for closedloop supply chain with product recovering with the consideration of some uncertainties including remanufacturing rate, disposal rate, operation costs and customers’ demand in this paper. Furthermore, we provide some insights about robust operation of closed-loop supply chain and propose a robust H∞ control strategy based on linear matrix inequality (LMI) arithmetic. Some simulations are executed to validate the effectiveness of our control strategy, and the results show that through state feedback control of supply chain inventories, it can not only make the CLSC achieve the goal of restraining uncertainty disturbances, but also result in an ideal operation cost.

PL

Closed loop supply chain (CLCP – zamknięta pętla łańcucha zasobów) jest dziś ważną metodą odzyskiwania zmarnowanego materiału i produktu w celu ochrony środowiska i konserwacji zasobów. Zaproponowano model dynamiczny uwzględniający niepewności typu tempo produkcji, tempo usuwania, koszty operacyjne i żądania klienta.

5

Visualization investigation on the marine data with multivariate statistical analysis methods

80%

Li Y. , Lu Z. , Wang M.

Polish Maritime Research

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2017

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tom S 2

89--94

EN

Marine information is an important way for us to know and study more about the ocean. Marine data makes the basic of marine information. Because of the huge quantity and diversity of marine data, and at the same time marine data is polyatomic variable, we start with statistical analysis methods to search for the regularity of the marine data. On one hand, we get the aggregate variation functions of the marine data by factor analyzing in aspect of the spatiality. Then we visually describe the marine status of the studied sea area with pre variogram function and post variogram function. On the other hand, we used cluster analysis method to get the verifying rule in time and make visible graphs of the marine data. In this way, we can also supply with the suggestions in classifying the sea seawater quality. The data processing result shows that the suggested methods in this article are both operable and effective. At the same time some reasonable suggestions are given in the article.

6

Digital watermarking based on error correction coding technique

80%

Niu X. , Lu Z. , Sun S.

Image Processing & Communications

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2000

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tom Vol. 6, no 1-2

23-28

EN

In this paper, a method of embedding a digital watermark into an image is proposed. By taking advantage of zerotree in the rearranged DCT coeffcients for watermarking, the algorithms can extract the watermark without original image. To enhance the robustness of watermarking, the watermark information is coded by error correction coding of Hamming code in our algorithm. Experimental results show that the proposed techniques successfully survive some image processing operations and the lossy compression techniques such as Joint Photographic Experts Group (JPEG).

7

The Development of the Flat-Knitted Shaped Uppers based on Ergonomics

80%

Lu Z. , Jiang G. , Cong H. , Yang X.

Autex Research Journal

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2016

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tom Vol. 16, no. 2

67--74

EN

To achieve the efficiency and specification of the flat-knitted uppers design, the basic patterns of uppers are made from shoe lasts based on the research on the characteristics of human’s feet and wearability requirements on uppers. The knitting technology for half-shaped and fully shaped uppers was formed after the shear deformation of basic pattern and combination with flat knitting technology. As regards to the functional requirements on key parts of uppers, the structures of flat-knitted shaped uppers were intensively analysed and studied, dividing them into two categories (functional structure and decorative structure), discussing the knitting methods and advantages of different structure, and finally experimentally proving that the planar pattern of flat knitted uppers can apply to the design of flat-knitted uppers and achieve the combination of functionality and artistry of sneakers after combining with structural changes, with a great significance on the achievement of the efficient production of uppers and the enhancement of its commercial value.

8

Maintainability fuzzy evaluation based on maintenance task virtual simulation for aircraft system

80%

Lu Z. , Zhou J. , Li N.

Eksploatacja i Niezawodność

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2015

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tom Vol. 17, no. 4

504--512

EN

Maintainability is a significant design characteristic of civil aircraft system that has great effect on system availability, life cycle cost and operation safety. A virtual maintenance environment is constructed to support maintainability concurrent design of aircraft system, the evaluation method of maintainability attribute is proposed based on maintenance task virtual simulation or maintainability checklist, and then system maintainability comprehensive evaluation is proposed based on fuzzy theory. A case study, which is maintainability evaluation of a nose landing gear system in civil aircraft, shows the effectiveness of the method presented herein.

PL

Obsługiwalność jest ważną cechą konstrukcyjną systemów stosowanych w samolotach cywilnych, która ma ogromny wpływ na gotowość systemu, koszty eksploatacji i bezpieczeństwo pracy W przedstawionych badaniach stworzono wirtualne środowisko eksploatacji wspierające łatwość obsługi systemów lotniczych; zaproponowana metoda oceny atrybutu obsługiwalności oparta jest o wirtualną symulację zadań konserwacyjnych lub listę kontrolną obsługiwalności. Następnie zaproponowano kompleksową ocenę obsługiwalności systemu opartą o teorię zbiorów rozmytych. Studium przypadku, analizujące obsługiwalność systemu podwozia części nosowej cywilnego samolotu, pokazuje skuteczność metody przedstawionej w niniejszym artykule.

9

Enhanced Photocatalytic Properties of Ag-Loaded N-Doped Tio2 Nanotube Arrays

71%

Gao D. , Lu Z. , Wang C. , Li W. , Dong P.

Autex Research Journal

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2018

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tom Vol. 18, no. 1

67--72

EN

Highly ordered TiO2 nanotube (TiO2 NT) arrays were prepared by anodic oxidizing method on the surface of the Ti substrate. Nitrogen-doped TiO2 nanotube (N-TiO2 NT) arrays were carried out by ammonia solution immersion, and Ag nanoparticles loaded N-doped TiO2 nanotube (Ag/N-TiO2 NT) arrays were obtained by successive ionic layer adsorption and reaction (SILAR) technique. The samples were characterized by the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL) emission spectra, ultraviolet–visible (UV–vis) diffuse reflectance spectroscopy (DRS). The result indicated that the diameter and wall thickness of the TiO2 NT are 100–120 and 20–30 nm, respectively. Moreover, the morphology and structure of the highly ordered TiO2 NTs were not affected by N-doping. Furthermore, Ag nanoparticles were evenly deposited on the surface of TiO2 NTs in the form of elemental silver. Finally, the photocatalytic activity of Ag/N-TiO2 NTs was evaluated by degradation of methyl orange (MO) under visible-light irradiation. The Ag/N-TiO2 NTs exhibited enhanced photocatalytic properties, which could reach 95% after 90-min irradiation.

10

Bafilomycin blocks vesicular histamine transport in Drosophila

71%

Borycz J. A. , Borycz J. , Lu Z. , Pyza E. , Meinertzhagen I. A.

Acta Neurobiologiae Experimentalis

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2005

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tom 65

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nr 3

11

The feedback stability research of HDRI system

71%

Chen Z. , Shen C. , Xu J. , Ni X. , Lu Z.

Optica Applicata

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2009

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tom Vol. 39, nr 2

357-363

EN

In this paper, one kind of high dynamic range imaging (HDRI) system is analyzed and the feedback stability is optimized. In this system, space light modulator (SLM) is used to modulate the input illuminance with the feedback signals. Because of the illuminance uncertainty of the scene, the feedback may take too long or turn into oscillations. To acquire the optimized feedback configuration, PID theory is used to analyze the feedback process. After PID parameter is obtained, simulations are applied to study the parameters. The optimized value range and principle of choice for the feedback control are discussed. Lastly, imaging experiments are conducted to obtain high dynamic range images, and the results prove the validity of PID parameters.

12

Mean failure mass and mean failure repair time: parameters linking reliability, maintainability and supportability

71%

Yang Y. , Lu Z. , Luo X. , Ge Z. , Qian Y.

Eksploatacja i Niezawodność

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2014

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tom Vol. 16, no. 2

307--312

PL

Jak dotąd w inżynierii niezawodności nie istniały parametry łączące niezawodność, obsługiwalność i utrzymywalność. Wskaźniki takie jak gotowość mogą być stosowane w celu sprawdzenia zgodności tych cech RAM (Reliability, Availability, Maintainability – Niezawodność, Gotowość, Obsługiwalność) dopiero po uzyskaniu indywidualnego wskaźnika każdej charakterystyki, takich jak MTBF, MTTR, itp. W ten sposób dostępne metody równoważenia owych trzech cech nie są wystarczająco skuteczne i bezpośrednie w fazie projektowania produktu . Niniejszy artykuł przedstawia pojęcia średniej masy uszkodzenia i średniego czasu naprawy uszkodzenia. Badając zależność prawdopodobieństwa uszkodzenia i masy produktu, uzyskuje się cechę łączącą niezawodność i utrzymywalność. Podobnie, badając zależność prawdopodobieństwa uszkodzenia i średniego czasu naprawy produktu, uzyskuje się cechę łączącą niezawodność i obsługiwalność. Na bazie powyższych definicji osiągnięto kompromisowe podejście do niezawodności, obsługiwalności i utrzymywalności podczas fazy projektowania. Skuteczności obu nowych koncepcji dowodzi przykład równoważenia niezawodności i obsługiwalności podsystemu stacji kosmicznej.

EN

Up to now, no parameters linking reliability, maintainability and supportability directly are available in reliability engineering. Index such as availability can be used to check the compatibility of those RAM features only after individual index of every characteristic is obtained such as MTBF, MTTR, etc. Thus available methods to balance those three features are not efficient and direct during the product design phase. In this paper, concepts of mean failure mass and mean failure repair time are presented. By investigating the relationship of the failure probability and the mass of a product, a feature linking reliability and supportability is obtained. Similarly, by studying the relationship of the failure probability and the mean time to repair of a product, a feature linking reliability and maintainability is obtained. Based on above definitions, an approach of reliability, maintainability and supportability trade-off during design phase is achieved. Effectiveness of both of the new concepts is demonstrated by an example of balancing the maintainability and supportability of a subsystem of a space station.

13

Influence of paclobutrazol on the growth and photosynthesis of Sequoia sempervirens seedlings

61%

Ju S. , Xu D. , Zhan C. , Ji L. , Yin T. , Li Z. , Lu Z.

Journal of Horticultural Research

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2019

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tom 27

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nr 1

14

Genetic diversity analysis in Valencia peanut [Arachis hypogaea L.] using microsatellite markers

61%

Krishna G. K. , Zhang J. , Burow M. , Pittman R. N. , Delikastadinov S. G. , Lu Z. , Puppala N.

Cellular and Molecular Biology Letters

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2004

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tom 09

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nr 4A

685-697

EN

Cultivated peanut or groundnut (Arachis hypogaea L) is an important source of oil and protein. Considerable variation has been recorded for morphological, physiological and agronomic traits, whereas few molecular variations have been recorded for this crop. The identification and understanding of molecular genetic diversity in cultivated peanut types will help in effective genetic conservation along with efficient breeding programs in this crop. The New Mexico breeding program has embarked upon a program of improvement of Valencia peanut (belonging to the sub species fastigiata), because efforts to improve the yield potential are lacking due to lack of identified divergent exotic types. For the first time, this study has shown molecular diversity using microsatellite markers in the cultivated Valencia peanut (sub spp. fastigiata) from around the globe. In this investigation, 48 cultivated Valencia peanut genotypes have been selected and analyzed using 18 fluorescently labeled SSR (f-SSR) primer pairs. These primer pairs amplified 120 polymorphic loci among the genotypes screened and amplified from 3 to 19 alleles with an average of 6.9 allele per primer pair. The f-SSR marker data was further analyzed using cluster algorithms and principal component analysis. The results indicated that (1) considerable genetic variations were discovered among the analyzed genotypes; (2) The f-SSR based clustering could identify the putative pedigree types of the present Valencia types of diverse origins, and (3) The f-SSR in general is sufficient to obtain estimates of genetic divergence for the material in study. The results are being utilized in our breeding program for parental selection and linkage map construction.

15

Contributions of radiation interception and radiation-use efficiency to biomass decrease due to potassium starvation depend on potassium deficiency intensities

61%

Pan Y. , Lu Z. , Li X. , Cong R. , Ren T. , Lu J.

Acta Physiologiae Plantarum

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2019

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tom 41

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nr 04

EN

Yield loss due to insufficient potassium fertilizer supply has been well documented; however, the information about the negative effect of potassium deficiency on crop yield caused by ecophysiological determinants is not enough. A field experiment with three K treatments (severe K deficiency treatment, K₁; moderate K deficiency treatment, K₂; and sufficient K supply treatment, K₃) was conducted to (1) assess the effects of potassium deficiency on green leaf area index (GLAI) reduction; (2) quantify the contributions of single leaf area, leaf senescence, and leaf appearance to GLAI reduction under potassium deficiency; (3) reveal the changes in the contributions of accumulated radiation interception (RIacc) and radiation-use efficiency (RUE) to above-ground biomass (AM) decrease of oilseed rape under different K supplies. GLAI was restrained due to potassium deficiency, with a reduction ranging from 10.6 to 45.4%. The reduced single leaf area and accelerated leaf senescence caused by potassium starvation accounted for 5.9–23.7% and 2.4–29.0% reduction in GLAI, but delayed leaf appearance rate contributed little. The RIacc during the seedling stage in the K₁, K₂, and K₃ treatments was 101.2, 110.7, and 120.0 MJ m⁻² , respectively, and the RUE in the K₁, K₂, and K₃ treatments was 1.03, 2.22, and 2.98 g MJ⁻¹ , respectively, which caused a 61.7% and 48.2% reduction of the final harvested AM in the K₁ and K₂ treatments compared with the K₃ treatment. When AM reduction was less than 24.8%, RIacc was the main determining factor; however, it transferred to RUE when biomass decreased more. In conclusion, GLAI decreased due to potassium starvation was mainly caused by the reduced single leaf area and accelerated leaf senescence, and the relative contribution of RIacc and RUE to AM decline was related to the degree of potassium deficiency.

16

Preparation, structure and optical properties of transparent conducting gallium-doped zinc oxide thin films

61%

Gu J. H. , Lu Z. , Long L. , Zhong Z. Y. , Yang C. Y. , Hou J.

Materials Science Poland

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2015

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tom Vol. 33, No. 3

470--481

EN

Highly conductive gallium-doped zinc oxide (GZO) transparent thin films were deposited on glass substrates by RF magnetron sputtering. The deposited films were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), four-point probe and UV-Vis spectrophotometer, respectively. The effect of growth temperature on the structure and optoelectrical properties of the films was investigated. The results demonstrate that high quality GZO films oriented with their crystallographic c-axis perpendicular to the substrates are obtained. The structure and optoelectrical properties of the films are highly dependent on the growth temperature. It is found that with increasing growth temperature, the average visible transmittance of the deposited films is enhanced and the residual stress in the thin films is obviously relaxed. The GZO films deposited at the growth temperature of 400 degrees C, which have the largest grain size (74.3 nm), the lowest electrical resistivity (1.31 x 10(-3) Omega.cm) and the maximum figure of merit (1.46 x 10(-2) Omega(-1)), exhibit the best optoelectrical properties. Furthermore, the optical properties of the deposited films were determined by the optical characterization methods and the optical energy-gaps were evaluated by extrapolation method. A blue shift of the optical energy gap is observed with an increase in the growth temperature.

17

Flat Knitting Loop Deformation Simulation Based on Interlacing Point Model

61%

Jiang G. , Lu Z. , Cong H. , Zhang A. , Dong Z. , Jia D.

Autex Research Journal

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2017

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tom Vol. 17, no. 4

361--369

EN

In order to create realistic loop primitives suitable for the faster CAD of the flat-knitted fabric, we have performed research on the model of the loop as well as the variation of the loop surface. This paper proposes an interlacing point-based model for the loop center curve, and uses the cubic Bezier curve to fit the central curve of the regular loop, elongated loop, transfer loop, and irregular deformed loop. In this way, a general model for the central curve of the deformed loop is obtained. The obtained model is then utilized to perform texture mapping, texture interpolation, and brightness processing, simulating a clearly structured and lifelike deformed loop. The computer program LOOP is developed by using the algorithm. The deformed loop is simulated with different yarns, and the deformed loop is applied to design of a cable stitch, demonstrating feasibility of the proposed algorithm. This paper provides a loop primitive simulation method characterized by lifelikeness, yarn material variability, and deformation flexibility, and facilitates the loop-based fast computer-aided design (CAD) of the knitted fabric.

18

Age, growth, and abundance fluctuation of Jordan’s damsel, Teixeirichthys jordani (Actinopterygii: Perciformes: Pomacentridae), in the southern Taiwan Strait

61%

Ju P. , Cheung W. W. L. , Lu Z. , Yang S. , Guo Z. , Chen M. , Xiao J.

Acta Ichthyologica et Piscatoria

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2019

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tom 49

|

nr 3

19

A blastocyst biopsy approach for preimplantation genetic diagnosis technique that affects the expression of SNAP-α in mice

51%

Zhang Y. , Fang Z. , Lu H. , Li Y. , Baloch Z. , Liu Y. , Yang S. , Lu Z. , Ding C.

Reproductive Biology

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2020

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tom 20

|

nr 3