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Wyszukujesz frazę "Van, T. T." wg kryterium: Autor


Tytuł:
Content-based image retrieval using a signature graph and a self-organizing map
Autorzy:
Van, T. T.
Le, T. M.
Powiązania:
https://bibliotekanauki.pl/articles/330159.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
binary signature
similarity measure
signature graph
image retrieval
sygnatura binarna
miara podobieństwa
wyszukiwanie obrazu
Opis:
In order to effectively retrieve a large database of images, a method of creating an image retrieval system CBIR (content-based image retrieval) is applied based on a binary index which aims to describe features of an image object of interest. This index is called the binary signature and builds input data for the problem of matching similar images. To extract the object of interest, we propose an image segmentation method on the basis of low-level visual features including the color and texture of the image. These features are extracted at each block of the image by the discrete wavelet frame transform and the appropriate color space. On the basis of a segmented image, we create a binary signature to describe the location, color and shape of the objects of interest. In order to match similar images, we provide a similarity measure between the images based on binary signatures. Then, we present a CBIR model which combines a signature graph and a self-organizing map to cluster and store similar images. To illustrate the proposed method, experiments on image databases are reported, including COREL, Wang and MSRDI.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 423-438
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical composition and antibacterial activity of ethanolic extract from trunk of Rothmannia wittii (Craib) Bremek. (Rubiaceae) newly found in Vietnam
Autorzy:
Van, H.T.
Nguyen, T.T.
Ton, H.T.T.
Dinh, K.T.T.
Le, V.S.
Pham, T.V.
Tran, G.B.
Powiązania:
https://bibliotekanauki.pl/articles/2096309.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Rothmannia wittii
extract
phytochemical composition
antibacterial activity
LC-MS
Opis:
Rothmannia wittii, which is found in Binh Chau-Phuoc Buu Nature Reserve, Bung Rieng ward, Xuyen Moc District, Ba Ria-Vung Tau Province, Vietnam, is a rare species of Rubiaceae family. The present study aimed to determine the phytochemical composition and antimicrobial activity of the ethanolic extract of the R. wittii trunk. A total of 10 compounds were identified by liquid chromatography-mass spectrophotometry (LC-MS), including 1) benzene, 1-(1,5-dimethyl-4- hexenyl)-4-methyl, 2) diphenylsulfone, 3) 6β-hydroxy-10-O-acetylgenipin, 4) cinnamyl-cinnamate, 5) genipin, 6) megastigmatrienone, 7) ethyl p-methoxy-trans-cinnamate, 8) rothalazepane, 9) 1,3,6-trimethylpyrano[2,3-d ]imidazole-2,5(1H,3H)-dione, and 10) shanzhiol. The extract also exhibited an antibacterial activity against six bacterial strains: Bacillus cereus, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Salmonella typhimurium and Salmonella enteritidis, as determined via disk diffusion agar method.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 4; 301-307
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable lean in SMEs: a quantitative analysis into improvement actions
Autorzy:
Van Landeghem, H.
Claeys, D.
Van Landeghem, T.
Powiązania:
https://bibliotekanauki.pl/articles/407201.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lean manufacturing
efficiency enhancement
productivity
continuous improvement
Opis:
Lean has established itself as the primordial approach to obtain operational excellence. Its simple and intuitive techniques focus on reducing lead time through continuous improvement, involving all levels of employees in the organization. However, the rate of successful implementations has remained low. This paper contributes to the understanding of continuous improvement in a Lean context, by analyzing a database of almost 10.000 improvement actions, from 85 companies, covering the time frame 2010–2018. It discusses categories of actions, their impact and cost, as well as key characteristics of the companies. It proposes an objective criterion to identify “success” and “failure” in Lean implementation and tries to link these to operational results. It is probably the first time an analysis of this magnitude on the subject has been performed.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 10-19
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuel continuous mixer - an approach solution to use straight vegetable oil for marine diesel engines
Autorzy:
Van Uy, D.
The Nam, T.
Powiązania:
https://bibliotekanauki.pl/articles/117233.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
fuel continuous mixer
straight vegetable oil
marine desel engine
ship operation
green fuel
mixed fuel
Vietnam Maritime University
diesel engine
Opis:
The vegetable oil is well known as green fuel for diesel engines due to its low sunphur content and renewable stock. However, there are some problems raising when vegetable oil is used as fuel for diesel engines such as highly effected by cold weather, lower general efficiency, separation in layer if mixed with diesel oil and so on. To overcome that disadvantiges, the authors propose a new idea that to use a continuous fuel mixer to blend vegetable oil with diesel oil to make so called a mixed fuel supplying to diesel engines inline. In order to ensure a quality of the mixed fuel created by continuous mixer, a homogeneous testing was introduced with believable results. Then, the continuous mixer has been installed into fuel supply system of diesel engine 6LU32 at a lab of Vietnam Maritime University in terms of checking a real operation of the fuel continuous mixer with diesel engine.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 151-157
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Locating critical circular and unconstrained failure surface in slope stability analysis with tailored genetic algorithm
Autorzy:
Pasik, T.
van der Meij, R.
Powiązania:
https://bibliotekanauki.pl/articles/178579.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
genetic algorithm
Spencers method
slope stability
critical failure surface
uplift phenomenon
Opis:
This article presents an efficient search method for representative circular and unconstrained slip surfaces with the use of the tailored genetic algorithm. Searches for unconstrained slip planes with rigid equilibrium methods are yet uncommon in engineering practice, and little publications regarding truly free slip planes exist. The proposed method presents an effective procedure being the result of the right combination of initial population type, selection, crossover and mutation method. The procedure needs little computational effort to find the optimum, unconstrained slip plane. The methodology described in this paper is implemented using Mathematica. The implementation, along with further explanations, is fully presented so the results can be reproduced. Sample slope stability calculations are performed for four cases, along with a detailed result interpretation. Two cases are compared with analyses described in earlier publications. The remaining two are practical cases of slope stability analyses of dikes in Netherlands. These four cases show the benefits of analyzing slope stability with a rigid equilibrium method combined with a genetic algorithm. The paper concludes by describing possibilities and limitations of using the genetic algorithm in the context of the slope stability problem.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 4; 87-98
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Focus of trichinellosis and factors determining its mild clinical course
Autorzy:
Kociecka, W
Van Knapen, F.
Kortbeek, T.
Powiązania:
https://bibliotekanauki.pl/articles/839887.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
human disease
man
trichinellosis
focus
Opis:
Present study aimed at analysing the set of epidemiologic, clinical and serological data in appraisal of trichinellosis focus in little towns near Poznań. It was stressed, that parasitic testing of the consumed meat associated with biological appraisal of Trichinella spiralis represent valuable criteria, which are helpful in interpretation mild clinical signs and symptoms, serological data and in establishing management of patients.
Źródło:
Annals of Parasitology; 1994, 40, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influences of porosity and tangential edge constraint on thermo-torsional postbuckling of FGM toroidal shell segments surrounded by an elastic medium
Autorzy:
Nhu Trang, L. T.
Van Tung, H.
Powiązania:
https://bibliotekanauki.pl/articles/38697106.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nonlinear buckling
porous FGM
toroidal shell segment
tangential edge constraint
torsional load
Opis:
For the first time, simultaneous influences of porosities, tangential constraints of boundary edges, surrounding elastic media and elevated temperature on the buckling and postbuckling behaviors of a functionally graded toroidal shell segment are investigated in this paper. Porosities exist in the functionally graded material (FGM) according to even and uneven distributions. Properties of constituent materials are assumed to be temperature dependent and effective properties of the porous FGM are determined using a modified rule of mixture. Governing equations are based on the classical shell theory taking into account geometrical nonlinearity and interactive pressure from surrounding elastic medium. Multi-term analytical solutions are assumed to satisfy simply supported boundary conditions and the Galerkin method is adopted to derive nonlinear load – deflection relations and buckling loads. Parametric studies are carried out to analyze the effects of porosity, shell geometry, degree of tangential edge constraint, elevated temperature and elastic media on the buckling resistance and postbuckling strength of toroidal shell segments under a torsional load. The study reveals that tangential edge restraints have considerably beneficial and detrimental influences on the nonlinear stability of torsion-loaded FGM shells at room and elevated temperatures, respectively. The results also find out that the shear layer and the elastic layer of surrounding medium significantly enhances and alleviates the buckling resistance capacity and severity of the snap-through response of the torsion-loaded porous FGM toroidal shell segment, respectively.
Źródło:
Archives of Mechanics; 2023, 75, 4; 401-429
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of surface water pollutant models of estuaries and coastal zone of Quang Ninh – Hai Phong using Spot-5 images
Ocena modeli zanieczyszczeń wód powierzchniowych w ujściach rzek i strefy przybrzeżnej Quang Ninh – Hai Phong przy wykorzystaniu obrazów Spot-5
Autorzy:
Ke, L. C.
Van Trang, H. T.
Liem, V. H.
Tuong, T. N.
Duyen, P. T.
Powiązania:
https://bibliotekanauki.pl/articles/145410.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
estuarine
pollution
BOD
COD
TSS
zanieczyszczenia
wody powierzchniowe
metoda teledetekcyjna
Opis:
The coastal zone and estuaries of Quang Ninh and Hai Phong have great potential not only for economic development but also for protection and conservation of biodiversity and ecosystem. Nowadays, due to industrial, agricultural and anthropogenic activities signs of water pollution in the region have been found. The level of surface water pollution can be determined by traditional methods through observatory stations. However, a traditional approach to determine water contamination is discontinuous, and thereby makes pollution assessment of the entire estuary very difficult. Nowadays, remote sensing technology has been developed and widely applied in many fields, for instance, in monitoring water environments. Remote sensing data combined with information from in-situ observations allow for extraction of polluted components in water and accurate measurements of pollution level in the large regions ensuring objectivity. According to results obtained from Spot-5 imagery of Quang Ninh and Hai Phong, the extracted pollution components, like BOD, COD and TSS can be determined with the root mean square error, the absolute mean error and the absolute mean percentage error (%): ±4.37 (mg/l) 3.86 (mg/l), 27%; ±55.32 (mg/l), 48.30 (mg/l), 14%; and ±32.90 (mg/l), 23.38 (mg/l), 28%; respectively. Obtained outcomes guarantee objectivity in assessing water contaminant levels in the investigated regions and show the advantages of remote sensing applications in Resource and Environmental Monitoring in relation to Water – Air – Land.
Strefa przybrzeżna i ujścia rzek w Quang Ninh – Hai Phong ma potencjał do rozwoju gospodarczego i ochrony różnorodności biologicznej i ekosystemu. Ostatnio stwierdzono tam wiele oznak zanieczyszczenia wody. Poziom zanieczyszczenia wód powierzchniowych może być określany na stacjach obserwacyjnych metodami tradycyjnymi, jednak znacznie szybsze i dokładniejsze jest wykorzystanie metod teledetekcyjnych. Analiza obrazów Spot-5 w Quang Ninh – Hai Phong umożliwiła stwierdzenie obecności różnych zanieczyszczeń, w tym BOD, COD i TSS ze średnim błędem kwadratowym, średnim błędem absolutnym i średnim błędem względnym odpowiednio: ± 4.37 (mg/l), 3.86 (mg/l), 27%; ± 55.32 (mg/l), 48.30 (mg/l), 14%; ± 32.90 (mg/l), 23.38 (mg/l), 28%. Otrzymane wyniki gwarantują obiektywizm przy ocenie poziomu zanieczyszczeń w badanych regionach i pokazują korzyści zastosowań teledetekcji w monitoringu zasobów i środowiska w odniesieniu do wody – powietrza – terenu.
Źródło:
Geodesy and Cartography; 2015, 64, 1; 29-42
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two implementations of the preconditioned conjugate gradient method on heterogeneous computing grids
Autorzy:
Collignon, T. P.
Van Gijzen, M. B.
Powiązania:
https://bibliotekanauki.pl/articles/907778.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przetwarzanie siatkowe
system liniowy
metoda iteracyjna
gradient sprzężony
przepływ pęcherzykowy
grid computing
large sparse linear systems
iterative methods
conjugate gradient method
Chronopoulos/Gear CG
GridSolve middleware
bubbly flows
Opis:
Efficient iterative solution of large linear systems on grid computers is a complex problem. The induced heterogeneity and volatile nature of the aggregated computational resources present numerous algorithmic challenges. This paper describes a case study regarding iterative solution of large sparse linear systems on grid computers within the software constraints of the grid middleware GridSolve and within the algorithmic constraints of preconditioned Conjugate Gradient (CG) type methods. We identify the various bottlenecks induced by the middleware and the iterative algorithm. We consider the standard CG algorithm of Hestenes and Stiefel, and as an alternative the Chronopoulos/Gear variant, a formulation that is potentially better suited for grid computing since it requires only one synchronisation point per iteration, instead of two for standard CG. In addition, we improve the computation-to-communication ratio by maximising the work in the preconditioner. In addition to these algorithmic improvements, we also try to minimise the communication overhead within the communication model currently used by the GridSolve middleware. We present numerical experiments on 3D bubbly flow problems using heterogeneous computing hardware that show lower computing times and better speed-up for the Chronopoulos/Gear variant of conjugate gradients. Finally, we suggest extensions to both the iterative algorithm and the middleware for improving granularity.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 1; 109-121
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Focus of trichinellosis and factors determining its mild clinical course
Autorzy:
Kocięcka, W.
Van Knapen, F.
Kortbeek, T.
Powiązania:
https://bibliotekanauki.pl/articles/2151497.pdf
Data publikacji:
1994
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
human disease
man
trichinellosis
focus
Opis:
Present study aimed at analysing the set of epidemiologic, clinical and serological data in appraisal of trichinellosis focus in little towns near Poznań. It was stressed, that parasitic testing of the consumed meat associated with biological appraisal of Trichinella spiralis represent valuable criteria, which are helpful in interpretation mild clinical signs and symptoms, serological data and in establishing management of patients.
Źródło:
Wiadomości Parazytologiczne; 1994, 40, 4; 375-380
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Velociraptorine dromaeosaurid teeth from the Kimmeridgian [Late Jurassic] of Germany
Autorzy:
van der Lubbe, T
Richter, U.
Knotschke, N.
Powiązania:
https://bibliotekanauki.pl/articles/21506.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
velociraptorine dromaeosaurid
tooth
Kimmeridgian
Late Jurassic
Jurassic
Germany
Saurischia
Theropoda
Dromaeosauridae
dromaeosaurid
paleontology
Opis:
Six theropod teeth from a Late Jurassic (Kimmeridgian) bone bed in Langenberg Quarry of Oker (Goslar, Germany) are identified as a new dromaeosaurid taxon, here left in open nomenclature. Direct comparison reveals that the teeth are very similar to velociraptorine dromaeosaurid teeth from the Guimarota coal mine (Late Jurassic, Portugal) and to velociraptorine dromaeosaurid teeth from Uña (Barremian, Cuenca Province, Spain). Our data indicate that the teeth from the Kimmeridgian of Lower Saxony are of velociraptorine dromaeosaurid type, and therefore represent one of the oldest occurrences of the group Dromaeosauridae.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 3; 401-408
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal stability of estimated soil water flux patterns across agricultural fields
Autorzy:
Guber, A.K.
Gish, T.J.
Pachepsky, Y.A.
van Genuchten, M.T.
Daughtry, C.S.T.
Nicholson, T.J.
Cady, R.E.
Powiązania:
https://bibliotekanauki.pl/articles/26191.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2008, 22, 3; 209-214
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of contamination in Namson Landfill, Hanoi, Vietnam by hydrogeophysical methods
Ocena stopnia skażenia terenu na obszarze składowiska odpadów Namson w Hanoi (Wietnam) z wykorzystaniem metod hydro-geofizycznych
Autorzy:
Van Giang, N.
Vu, N. T.
Duan, N. B.
Powiązania:
https://bibliotekanauki.pl/articles/218928.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obrazowanie elektrooporowe
metoda potencjałów własnych
badanie elektromagnetyczne bardzo niskich częstotliwości (VLF)
electrical resistivity tomography
self-potential
hydrogeophysics
NamSon waste site
Opis:
The main objective of this study was to assess the environmental impact of the subsurface geological structure in Nam Son landfill by hydrogeophysical method. The Electrical Resistivity Tomography (ERT), Self-Potential (SP) and Very Low Frequency (VLF) method was used for geological structure investigation. Three profiles (total 900 m long) of two-dimensional ERT, VLF density sections and 180 SP data points scattered within the study area near the disposal site were implemented. Surface water and groundwater samples were collected from 10 sites in the area for hydrochemical analysis. Interpretations of geophysical data show a low resistivity zone (<15 Ω m), which appears to be a fully saturated zone with leachate from an open dumpsite. There is a good correlation between the geophysical investigations and the results of hydrochemical analysis.
Podstawowym celem pracy było określenie stopnia oddziaływania na środowisko w podpowierzchniowych warstwach geologicznych na obszarze składowiska odpadów Nam Son przy wykorzystaniu metod hydro-geofizycznych. W badaniach budowy geologicznej terenu wykorzystano metodę obrazowania elektrooporowego (Electrical Resistivity Tomography – ERT), metodę potencjałów własnych (Self-Potential – SP) oraz badania elektromagnetyczne bardzo niskich częstotliwości (Very Low Frequency – VLF). Wytypowano trzy profile (o całkowitej długości 900 m) do dwuwymiarowego obrazowanie ERT oraz siatki gęstości do badania elektromagnetycznego VLF oraz 180 rozproszonych punktów do badań metodą potencjałów własnych na badanym terenie. Próbki wód powierzchniowych i gruntowych do analizy chemicznej pobrano z 10 lokalizacji na terenie składowiska. Interpretacja danych geofizycznych wykazała istnienie strefy charakteryzującej się niskimi oporami (<15 Ω), w pełni nasyconej odpadami ciekłymi wypłukiwanymi z otwartego składowiska. Stwierdzono wysoki poziom korelacji pomiędzy rezultatami badań geofizycznych a wynikami analiz chemicznych.
Źródło:
Archives of Mining Sciences; 2018, 63, 2; 397-416
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of a thoracolumbosacral orthosis on gait performance in healthy adults during walking
Autorzy:
Van Criekinge, T.
Truijen, S.
Hallemans, A.
Saeys, W.
Powiązania:
https://bibliotekanauki.pl/articles/306970.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tułów
lokomocja
kinematyka
zjawisko biomechaniczne
torso
orthotic devices
locomotion
kinematics
biomechanical phenomenon
Opis:
Since the thorax and pelvis are primary determinants of normal and pathological walking, it is important to know how gait performance is influenced when the trunk is constraint. The objective of this study is to investigate the effect of a thoracolumbosacral orthosis (TLSO) on gait performance in healthy adults during overground walking. Methods: Fourteen healthy volunteers walked with and without TLSO. Outcome measures consisted of spatiotemporal parameters and clinically important joint angular time profiles of the lower limbs. Joint angular time profiles were assessed in the sagittal, frontal and transversal plane. A paired t-test was used for discrete parameters and spm1d for assessing the joint angular time profiles. Results: Walking with a constraint resulted in decreased stride time and step time, increased step width and cadence. In the sagittal plane, no significant differences were observed regarding joint kinematics in the hip, knee and ankle. In the frontal plane, decreased adduction during stance and abduction during swing was observed in the hip. In the transversal plane, increased external rotation of the hip and increased internal rotation of the ankle was seen when wearing a contstraint. Conclusions: Wearing a TLSO can already bring forth significant changes in gait performance, suggesting an important relationship between trunk movements and mobility.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 4; 15-21
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł

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