Wyniki wyszukiwania - Biblioteka Nauki

1

Image segmentation based on fuzzy clustering with neighborhood information

100%

Yang Y.

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2009

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tom Vol. 39, nr 1

135--147

EN

In this paper, an improved fuzzy c-means (IFCM) clustering algorithm for image segmentation is presented. The originality of this algorithm is based on the fact that the conventional FCM-based algorithm considers no spatial context information, which makes it sensitive to noise. The new algorithm is formulated by incorporating the spatial neighborhood information into the original FCM algorithm by a priori probability and initialized by a histogram based FCM algorithm. The probability in the algorithm that indicates the spatial influence of the neighboring pixels on the centre pixel plays a key role in this algorithm and can be automatically decided in the implementation of the algorithm by the fuzzy membership. To quantitatively evaluate and prove the performance of the proposed method, series of experiments and comparisons with many derivates of FCM algorithms are given in the paper. Experimental results show that the proposed method is effective and robust to noise. In this paper, an improved fuzzy c-means (IFCM) clustering algorithm for image segmentation is presented. The originality of this algorithm is based on the fact that the conventional FCM-based algorithm considers no spatial context information, which makes it sensitive to noise. The new algorithm is formulated by incorporating the spatial neighborhood information into the original FCM algorithm by a priori probability and initialized by a histogram based FCM algorithm. The probability in the algorithm that indicates the spatial influence of the neighboring pixels on the centre pixel plays a key role in this algorithm and can be automatically decided in the implementation of the algorithm by the fuzzy membership. To quantitatively evaluate and prove the performance of the proposed method, series of experiments and comparisons with many derivates of FCM algorithms are given in the paper. Experimental results show that the proposed method is effective and robust to noise.

2

A simple and sensitive gas chromatographic-tandem mass spectrometric method for the determination of cantharidin in cosmetic products

63%

Peng M. , Yang Y.

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tom Vol. 23, no. 4

611--619

EN

The analysis of cantharidin, a potent antitumor yet highly toxic chemical, is reported in this article. In regions including the United States, Europe, and China, cantharidin is either a banned ingredient or being highly regulated in cosmetic products. In this article, a gas chromatographic-tandem mass spectrometric (GC-MS/MS) method has been established for the determination of cantharidin in cosmetic products. Cosmetic samples were divided into two groups according to whether they contained aqueous ethanol or not. Samples containing aqueous ethanol in the formulation were dried under an air flow prior to extraction by methanol. The multiple reaction monitoring (MRM) mode with the parent ion at m/z 128 and the product ions at m/z 55 and 85 was employed. The linear range covered from 0.1 to 30.00 μg mL-1 (R = 0.9996) for cantharidin. The detection limit (LOD) was 0.3 μg kg. -1. The intraday and between-day relative standard deviations (RSDs) were <8.7%. The mean recoveries were within the range 101.5–110.5%. The developed GC-MS/MS method was applied on 12 commercial cosmetic product samples, and is shown to be simple and sensitive and can be used for the qualitative and quantitative analysis of cantharidin in cosmetic products.

3

Lycocerus strictipennis sp. nov. from Yunnan, China, the second species in the Michiakii species-group of Lycocerus Gorham (Coleoptera: Cantharidae)

63%

Yang Y. , Yang X.

|

nr 4

EN

A second species of michiakii species-group of Lycocerus Gorham is described, L. strictipennis sp. nov. (CHINA, Yunnan), and provided with illustrations of aedeagus. L. michiakii Okushima et Brancucci, 2008 is recorded from China for the first time. Habitus photos of both species are presented.

4

Effectiveness of Korean pine (Pinus koraiensis) seeds dispersing by small rodents in fragmented forests

63%

Yang Y. , Yi X.

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tom Vol. 59, nr 2

413-422

EN

The effectiveness of dispersers on seeds of Korean pine (Pinus koraiensis Siebold et Zuccarini) was investigated in three fragmented stands and one primary stand. The proportion of Korean pine trees was less than 7% in the fragmented stands but more than 90% in primary stand. Five estimates related seed dispersal (proportion of removed seeds, scatter-hoarded seeds, cache dynamics, dispersal distance and microhabitat) were assessed to see the effect of forest fragmentation on the probability of seed dispersal of Korean pine seeds. Our results indicated fast seed harvest of Korean pine by small rodents at the seed stations and no difference among the four stands. Scatter-hoarding rodents were potentially important in promoting natural regeneration of Korean pine as revealed by high proportion of seed removal (up to 50%), short seed lifetime from the seed release locations and lower proportion of seeds remained on the ground surface. Although a proportion of seeds were scatter-hoarded in fragmented stands, no seedling successfully established due to heavy predation. Dispersal distances were strongly left-skewed in fragmented stands, indicating that fragmentation is likely to be disadvantageous for longer distance dispersal. The effective dispersal was suffered from a very heavy cost as accompanied by a great portion of seed predation and lower level of scatter-hoarded seeds. Failing to see seedling establishment in fragmented stands rather than in primary stand indicated that fragmentation and deforestation have negative effects on dispersal behavior and consequently seed destination. Artificial tree plantation and pinecone protection are highly recommended for Korean pine regeneration.

5

Scatterhoarding of Manchurian walnut Juglans mandshurica by small mammals: response to seed familiarity and seed size

63%

Yi X. , Yang Y.

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2011

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tom 56

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nr 2

EN

Dispersal patterns can be affected by seed familiarity and seed traits, including size, mass, and nutritional value, but these factors have not been intensively studied in the context of seed dispersal processes. Our aim was to study how small rodents respond to seed size and seed familiarity in their pattern of Manchurian walnut (Juglans mandshurica) seeds in two different habitats in temperate forests of northeast China. Our results demonstrated that Apodemus penisulae acts as the most important disperser for Manchurian walnut seeds. Inexperienced small rodents did not reject seeds of the Manchurian walnut and show similar seed removal rates as compared with experienced rodents. Both experienced and naïve rodents actively participated in seed scatterhoarding of Manchurian walnut seeds. Consecutive survey showed that seeds with large size/mass were removed faster than those with small size/mass, indicating a preference for large seeds. However, small seeds scatter-hoarded by small rodents were transported farther than large ones, failing to support the traditional optimization models for various tree species. Small seeds of Manchurian walnut in caches were less likely to be recovered than large ones and showed greater cache survival rates, indicating that small seeds would be more advantageous for regeneration than large seeds in small rodent-dominated forests.

6

Existence results for mild solutions of impulsive periodic systems

63%

Yang Y. , Wang J.

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2012

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tom Vol. 32, no. 3

601-616

EN

By applying the Horn's fixed point theorem, we prove the existence of T0-periodic PC-mild solution of impulsive periodic systems when PC-mild solutions are ultimate bounded.

7

Novel statistical approach for segmentation of brain magnetic resonance imaging using an improved expectation maximization algorithm

63%

Yang Y. , Huang S.

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2006

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tom Vol. 36, nr 1

125-136

EN

In this paper, an improved expectation maximization (EM) algorithm called statistical histogram based expectation maximization (SHEM) algorithm is presented. The algorithm is put forward to overcome the drawback of standard EM algorithm, which is extremely computationally expensive for calculating the maximum likelihood (ML) parameters in the statistical segmentation. Combining the SHEM algorithm and the connected threshold region-growing algorithm that is used to provide a priori knowledge, a novel statistical approach for segmentation of brain magnetic resonance (MR) image data is thus proposed. The performance of our SHEM based method is compared with those of the EM based method and the commonly applied fuzzy C-means (FCM) segmentation. Experimental results show the proposed approach to be effective, robust and significantly faster than the conventional EM based method.

8

Molecular phylogeny of Populus (Salicaceae, Salicales) with focus on inter- and intrasectional relationships

51%

Du S. , Hu X. , Yang Y. , Wang Z.

|

tom 88

9

A numerical approach in applying panel method for the added mass of a group of sections in fluids

51%

Zhang D. , Li P. , Wang Q. , Yang Y.

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tom Vol. 75, nr 1-2

151--168

EN

This paper firstly expands an efficient numerical methodology developed from the source panel method to the added mass calculation of long column systems in fluid. Structures submerged in fluid are considered as two-dimensional and are discretized into a number of source panels. The influence coefficient matrices and the potential function are then calculated and the fluid forces are calculated by the unsteady Bernoulli equation. Finally, we utilize this present method to calculate the mass coefficients of some typical problems, which effectively verifies its feasibility and accuracy. This method takes into account both applicability and computational efficiency. On the one hand, in contrast to the analytical method which is only applicable to specific cross-sections, this method is applicable to arbitrary boundaries with C0 continuity in mathematics. On the other hand, this method requires less mesh and computation than commercial software. This paper extends the application of the source panel method which is widely used in aerodynamics to provide a reference for added mass calculation problems in engineering.

10

One cabin equipment location method based on the visibility human-factor potential field

51%

Ge Z. , Wu F. , Yang Y. , Luo X.

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tom Vol. 17, no. 2

236--242

EN

The visibility is the basic condition for cabin equipment location. For the description of human, object and obstacle, the humanfactor potential field concept is proposed in this paper, concluding the visibility potential field, the reachability potential field. The cabin equipment layout problem is modeled based on the basic visibility potential field model. The optimal layout optimization method is studied based on the particle swarm optimization (PSO) algorithm by natural selection. Finally, the applicability of the proposed idea is illustrated by numerical studies.

PL

Widoczność jest podstawowym warunkiem przy projektowaniu rozmieszczenia przyrządów pokładowych. W przedstawionej pracy zaproponowano pojęcie potencjałowego pola czynnika ludzkiego (human-factor potential field, HFPF), które służy do opisu czynnika ludzkiego, przedmiotów oraz przeszkód. HFPF obejmuje pojęcia potencjałowego pola widoczności oraz potencjałowego pola dostępu. Problem umiejscowienia elementów wyposażenia kabiny zamodelowano na podstawie podstawowego modelu potencjałowego pola widoczności. Metodę optymalizacji rozmieszczenia elementów wyposażenia badano w oparciu o algorytm optymalizacji rojem cząstek (PSO), metodą naturalnej selekcji. Zastosowanie proponowanej koncepcji zilustrowano na przykładzie badań numerycznych.

11

Simulated ammonia nitrogen wastewater treated with spent mushroom compost in a laboratory bioreactor

51%

Yang Y. , Liang W. , Hu K.

|

2016

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tom 25

|

nr 5

EN

The simulated ammonia nitrogen wastewater was treated with spent mushroom compost (SMC) in a laboratory bioreactor (LBR), and shifts in microbial diversity in LBR were conducted by polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE). We found that the removal efficiencies of NH4+-N and COD reached 73.4% and 61.7%, respectively, and that simultaneous nitrification and denitrification (SND) was observed during the process of NH4+-N removal. In addition, we observed that there were no obvious changes in microbial diversity shifts, and that the predominant four isolates were identified as Flavobacterium johnsoniae, Sphinbacterium multivorum, Comamonas sp., and Rhizobium sp., which functioned together and played a critical role in treating simulated ammonia nitrogen wastewater in LBR. Overall, SMC could provide both carbon sources and indigenous functional microorganisms for nitrogen removal, indicating that SMC has potential for wastewater treatment.

12

Analysis of jacking force for rectangular pipe-jacking machine

51%

Li H. , Yang Y. , Tu X. , Wang T.

|

tom R. 88, nr 9b

200-203

EN

For the electrical control system of push pipe driving machine, the adjustment of jacking force is critical to balancing the resistance force and moving the pipe string forward. This force should be well under control so as to avoid both the collapse (active failure) and the blow-out (passive failure) of the soil mass near the tunnel face. The aim of this paper is to determine the collapse and blow-out face jacking force of a rectangular tunnel. The analysis is carried out in the framework of the kinematic method of limit analysis theory. The numerical results obtained are presented and analyzed.

PL

W maszynach do przeciskania rur istotną role odgrywa siła przecisku (jacking force). W artykule analizuje się tę siłę dla prostokątnego tunelu.

13

Research on Interval Concept Lattice and its Construction Algorithm

51%

Liu B. , Zhang C. , Yang Y.

|

2013

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tom R. 89, nr 1b

1--6

EN

In classic concept lattice and rough concept lattice, the concept extents have all the attributes or only one attribute sometimes. So the support and confidence degree of the extracted association rules would be reduced greatly. To solve this problem, authors have put forward a new concept lattice structure: interval concept lattice Lαβ (Mα, Mβ,Y) based on the parameter interval [ α,β ] (0 ≤ α ≤ β ≤ 1). The concept extent is an object sets which meet the properties in the intent in the interval [ α,β ] 0 ≤ α ≤ β ≤ 1. It has been proved that interval concept lattice degenerate into classic concept lattice when ( α = β = 1), and when ( α > 0, β = 1), interval concept lattice degenerate into rough concept lattice. Then some unique properties of interval concept lattice have been proved. The construction algorithm of interval concept lattice was designed. Finally, the necessity and practicability were verified through a case study.

PL

W klasycznej i przybliżonej kracie pojęć ich obszar obejmuje każdy lub czasami tylko jeden atrybut. A więc podstawa i stopień poufności wydobywanych relacji mogą zostać poważnie zredukowane. Aby rozwiązać ten problem autorzy proponują nową strukturę kraty pojęć: przedziałową kratę pojęć Lαβ (Mα, Mβ,Y) zdefiniowaną w przedziale [ α,β ] (0 ≤ α ≤ β ≤ 1). Udowodniono, że przedziałowa krata pojęć przekształca się w klasyczną jeśli ( α = β = 1) i w przybliżoną gdy ( α > 0, β = 1). Zbadano unikalne własności kraty przedziałowej i zaprojektowano algorytm jej budowy. W końcu zweryfikowano , w przypadku studialnym, potrzebę jej wprowadzenia i możliwość wykonania.

14

Does environmentalregulation affect the introduction of foreign direct investment in China? - Empirical research based on the spatial Durbin model

51%

Yang Y. , Niu G. , Tang D. , Zhu M.

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tom 28

|

nr 1

EN

Based on the statistical data of 30 provinces in China from 2003 to 2014, this paper uses the spatial Durbin model to empirically test the influence of China’s urban environmental regulation on the introduction of foreign direct investment (FDI). The results show that there is significant spatial correlation between environmental regulation and FDI. Environmental regulation has a negative impact on the introduction of FDI, but the impact is not significant across the country, indicating that the evidence of the pollution haven hypothesis is insufficient in China. Then, the influential effect of environmental regulation on the introduction of FDI has obvious regional differences. The level of environmental regulation in the eastern region is positively correlated with the convenience in FDI introduction, while in the central and western regions, environmental regulation pose a hindrance to the introduction of FDI, which is remarkable only in the central area. In addition, labor costs and human capital levels have a direct effect on the introduction of FDI in the region. The level of regional economic development and R&D investment have a significant indirect impact on the introduction of FDI in surrounding areas, and economic openness has a significant impact on the introduction of FDI in all regions.

15

Pollution processes in chinese mining area from isotope evidence

51%

Meng Z. , Yang Y. , Qin Z.

|

nr 6

EN

Hydrological and nitrate pollution processes are important parts of aquatic ecosystems. For this study we collected samples of river water, reservoir water, shallow groundwater, deep groundwater, and precipitation in the Fenhe River Basin. δD and δ¹⁸O were used to identify the hydrological process. δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ were used to identify the sources and pollution process of NO₃⁻. The results show that precipitation is the main source of water in the study area, and there is an obvious isotopic fractionation caused by evaporation. The reservoir water, river water, soil water, and shallow groundwater had a mutual recharge and discharge association. Deep groundwater is recharged by archaic groundwater and less affected by evaporation and human activity. NO₃⁻ is the main N species in the study area, nitrification is the main source of NO₃⁻, and denitrification is also found in some river branches. 46.2% of NO₃⁻-N concentrations exceeded the drinking water standard of China. NO₃⁻ Sources are mainly controlled by land use type. Nitrogen in precipitation and soil organic N are the major sources of NO₃⁻ in the upstream. The midstream area is mainly polluted by manure and sewage, while the downstream area is polluted by a mixture of soil organic N and fertilizers.

16

Separation of split shear waves based on a hodogram analysis of HTI media

51%

Yang Y. , Lu J. , Wang Y.

|

tom Vol. 66, no. 4

643--658

EN

Although the shear-wave birefringence phenomenon affects the imaging of converted shear waves, it also provides a considerable amount of information on subsurface fracture development. Therefore, it is significant to separate split shear waves before seismic interpretation and reservoir prediction. In this paper, we propose a new method of split shear waves separation based on the polarization directions derived from hodogram analysis. Through the hodogram analysis, we find that the split shear-wave particle motions are within the range of a specific and fixed rectangle, which have relations with the fracture azimuth in strata. In addition, we found that a couple of split shear waves can only be fitted to the unique trajectory rectangle through the theoretical derivation. Based on this, we establish the trajectory rectangle through the wave vector calculation and calculate the fracture azimuth according to the fact that the one edge of the trajectory rectangle is along or perpendicular to the fracture azimuth. Synthetic data analysis shows that the calculation accuracy of fracture azimuth under the constraint of trajectory rectangle is less affected by the time delay between split shear waves than using the method of eigenvector–eigenvalue decomposition (EED). Therefore, we can obtain better results for separation of split shear waves using our method than using EED. Eventually, we propose an approach of layer stripping to deal with the problem that shear wave split several times due to the situation that different strata have different fracture azimuths. Synthetic data test indicates that our method can achieve higher calculation efficiency and faster convergence speed than the conventional eigenvector–eigenvalue decomposition method, even though the data are of a low signal-to-noise ratio. Moreover, field data applications show the effectiveness and potential of our method.

17

Morphological and molecular study of Neorhadinorhynchus nudus (Harada, 1938) (Acanthocephala: Cavisomidae) from Auxis thazard Lacepede (Perciformes: Scombridae) in the South China Sea

51%

Li L. , Chen H.-X. , Yang Y.

|

nr 3

18

Advanced treatment of coal chemical industry wastewater by electro-catalysis with Gd-doped Ti/SnO2 anode

51%

Hou B. , Deng R. , Zhuang H. , Yang Y.

|

tom 26

|

nr 3

EN

The preparation of a Gd-doped Ti/SnO₂ anode using the sol-gel method was employed in electrolysis as an advanced treatment of coal chemical industry wastewater. The optimal Gd-doped content and sintering temperature were 2% and 750ºC. The electro-catalytic performance was enhanced after doping with an adequate amount of Gd. The doped Gd accelerated the generation rate and content of hydroxyl radicals in the electrolysis process. Gd was mixed into the SnO₂ lattice by means of displacement to refine the SnO₂ crystalline grain. The diminution of grain size supplied more active sites on the electrode surface. The reaction of TOC degradation was between pseudo zero-order and first-order kinetics, and was more inclined to pseudo first-order kinetics. The performance and the stability test demonstrated that the prepared Ti/Gd-SnO₂ anode was competent and that electrolysis with the anode could serve as a technically feasible method with potential application for the advanced treatment of coal chemical industry wastewater.

19

Mutual influence of energy consumption and foreign direct investment on haze pollution in China: a spatial econometric approach

51%

Tang D. , Xu H. , Yang Y.

Polish Journal of Environmental Studies

|

2018

|

tom 27

|

nr 4

EN

Based on the data of annual average values of PM₁₀ concentrations in China, this study empirically investigates the spatial autocorrelation of haze pollution in China and the mutual influence of energy consumption and foreign direct investment on haze pollution in China from 2004 to 2014 using the spatial econometric method. Moran’s I values are all above 0 during the 10 years, which indicates that haze pollution in China exists with significant spatial autocorrelation. Then the spatial econometric model estimation results show that energy consumption has a significant and positive effect on haze pollution in China while foreign direct investment has a significant and negative effect on haze pollution. Meanwhile, the regression coefficient of mutual variable of energy consumption and foreign direct investment is 0.063 at the 5% level, which suggests that foreign direct investment plays an important role in regulating the relationship between energy consumption and haze pollution, namely that the aggravation effect of energy consumption on haze pollution will increase with the increase of foreign direct investment. Finally, we provide some policy guidance for controlling haze pollution in China.

20

Study on striking ship with loading impact on the performance of the double hull oil tanker collision

51%

Wu W. , Yang Y. , Zhang J. , Lu J.

|

2018

|

tom S 2

42--48

EN

Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/ LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker.