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    Wyświetlanie 1-13 z 13
    Tytuł:
    Development of Solution for Safe Ship Considering Seakeeping PERformance
    Autorzy:
    Yoon, H.K.
    Nguyen, V.M.
    Nguyen, T.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/116617.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    seakeeping
    seakeeping performance
    safe ship
    safe ship considering
    optimal weather routing
    container ship
    Dynamic Programming (DP)
    Changwon National University (CWNU)
    Opis:
    In recent years, safety of a ships has become one important issues needed to solved as soon as possible in ship navigation. Optimal weather routing is one of best solution for ensuring safe operation of a ship with a with short passage time or minimum energy to avoid a certain excessive motion. This paper introduced the development of solution for safety and optimal weather routing a ship considering seakeeping performance based on model test result. This study introduced how to apply A* algorithm based on result of the seakeeping model test for determining the optimal ship routes. Seakeeping model test of 8600 TEU container ship was carried out in Changwon National University's seakeeping basin and its RAOs at various frequencies were used to predict the RMS motion values in irregular waves. The specially modelled path-cost function and the safety constraints were proposed for finding the optimal path of the ship. The comparison of ship performances estimated by great circle’s path and estimated optimal route during the voyage of the ship was investigated.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 517-525
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    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:
    Software Startups – A Research Agenda
    Autorzy:
    Unterkalmsteiner, M.
    Abrahamsson, P.
    Wang, X. F.
    Nguyen-Duc, A.
    Shah, S.
    Bajwa, S. S.
    Baltes, G. H.
    Conboy, K.
    Cullina, E.
    Dennehy, D.
    Edison, H.
    Fernandez-Sanchez, C
    Garbajosa, J.
    Gorschek, T.
    Klotins, E.
    Hokkanen, L.
    Kon, F.
    Lunesu, I.
    Marchesi, M.
    Morgan, L.
    Oivo, M.
    Selig, C.
    Seppänen, P.
    Sweetman, R.
    Tyrväinen, P.
    Ungerer, C.
    Yagüe, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/953060.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    software startup
    research agenda
    software-intensive systems
    Opis:
    Software startup companies develop innovative, software-intensive products within limited time frames and with few resources, searching for sustainable and scalable business models. Software startups are quite distinct from traditional mature software companies, but also from micro-, small-, and medium-sized enterprises, introducing new challenges relevant for software engineering research. This paper’s research agenda focuses on software engineering in startups, identifying, in particular, 70+ research questions in the areas of supporting startup engineering activities, startup evolution models and patterns, ecosystems and innovation hubs, human aspects in software startups, applying startup concepts in non-startup environments, and methodologies and theories for startup research. We connect and motivate this research agenda with past studies in software startup research, while pointing out possible future directions. While all authors of this research agenda have their main background in Software Engineering or Computer Science, their interestin software startups broadens the perspective to the challenges, but also to the opportunities that emerge from multi-disciplinary research. Our audience is therefore primarily software engineering researchers, even though we aim at stimulating collaborations and research that crosses disciplinary boundaries. We believe that with this research agenda we cover a wide spectrum of the software startup industry current needs.
    Źródło:
    e-Informatica Software Engineering Journal; 2016, 10, 1; 89-123
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza bezczujnikowego indukcyjnego napędu trakcyjnego z optymalnym algorytmem osłabiania pola
    Optimal field-weakening algorithm for direct torque control of sensorless traction drive with induction motor
    Autorzy:
    Tarchała, G.
    Orłowska-Kowalska, T.
    Nguyen-Thac, K.
    Dybkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811970.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silnik indukcyjny
    napęd trakcyjny
    estymacja prędkości
    bezpośrednie sterowanie momentem
    osłabianie pola
    Opis:
    This paper deals with the field-weakening of the traction induction motor drive. The field-weakening method is optimal with respect to the voltage and current limits. The drive is controlled using the Direct Torque Control method with the Space Vector Modulation algorithm, DTC-SVM. The speed of the drive, used in the system, is estimated using two estimators, both are the Model Reference Adaptive System (MRAS) type. One of them takes the advantage of the PI controller, the second one uses the sign function, what is typical for the Sliding-Mode theory. The described issues are illustrated using experimental tests results, obtained on a laboratory setup with 50 kW induction motor.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 125-134
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of organisational culture on total quality management implementation and firm performance: evidence from the Vietnamese construction industry
    Autorzy:
    Panuwatwanich, K.
    Nguyen, T. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/406983.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Total Quality Management
    Competing Value Framework
    Construction
    Culture
    Vietnam
    Opis:
    The main purpose of this study is to examine the relationship between organisational culture (OC) and Total Quality Management (TQM), and the influence of TQM implementation on organisational performance improvement within the context of the Vietnamese construction industry. A survey was conducted with 104 respondents from Vietnamese construction firms, using validated survey instruments developed in past research. Analysis techniques include cluster analysis and Structural Equation Modelling. Findings showed that Vietnamese construction firms are dominated by clan and hierarchy cultures rather than adhocracy and market cultures according to Competing Value Framework (CVF) of OC classification. urthermore, it was found that organisations dominated by either clan or adhocracy cultures could provide a favourable environment for successful TQM implementation, whereas this is not the case for those dominated by both market and hierarchy cultures. This study also confirmed the significant and positive relationship between TQM implementation and organisational performance improvement.
    Źródło:
    Management and Production Engineering Review; 2017, 8, 1; 5-15
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the stator winding resistance on the field-weakening operation of the DRFOC induction motor drive
    Autorzy:
    Nguyen-Thac, K.
    Orlowska-Kowalska, T.
    Tarchala, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/201695.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    induction motor
    optimal field-weakening
    direct field oriented control
    Opis:
    In this paper, an analysis of the influence of the stator winding resistance on the field-weakening operation of the induction motor drive based on the Direct Rotor Flux Oriented Control (DRFOC) is presented. Two scenarions of the optimal field-weakening algorithm (with and without stator winding resistance taken into account) have been compared and verified through simulation and experiment, under different operation conditions of the DRFOC drive system with 3 [kW] induction motor.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 815-823
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of chosen field weakening methods for the space vector modulated - direct torque controlled drive system
    Autorzy:
    Nguyen Thac, K.
    Orłowska-Kowalska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807724.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    induction motor
    direct torque control
    field weakening
    optimal control
    Opis:
    This paper presents a new simple field weakening (FW) strategy for the Direct Torque Control (DTC) of the induction motor (IM). Based on the Space Vector Modulated - Direct Torque Control (SVM- DTC) scheme, an analysis and comparison of conventional (1/ωm) and proposed method are presented for a whole speed range including FW regions. The proposed strategy is verified through simulation with a 1.5 kW induction motor drive.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2011, 65, 31; 267-280
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of the DTC-FSVM based induction motor drive in a wide speed range
    Autorzy:
    Nguyen Thac, K.
    Orlowska-Kowalska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1817721.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    induction motor
    direct torque control
    Flux-Space-Vector Modulation
    field weakening control
    Opis:
    In this paper the direct flux and torque control structure based on Flux-error Space Vector Modulation (DTC-FSVM) has been analyzed and compared to a classical DTC-SVM system. The control structures have been tested in a wide speed range including field weakening algorithm based on the voltage and current limits of the voltage inverter and the induction motor. The proposed control strategies are verified through simulation with a 3 kW induction motor drive.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2014, 70, 34; 3--15
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model for the inverse 1-median problem on trees under uncertain costs
    Autorzy:
    Nguyen, K. T.
    Chi, N. T. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/254814.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    location problem
    uncertain variable
    inverse optimization problem
    tree
    Opis:
    We consider the problem of justifying vertex weights of a tree under uncertain costs so that a prespecified vertex become optimal and the total cost should be optimal in the uncertainty scenario. We propose a model which delivers the information about the optimal cost which respect to each confidence level α ∈ [0,1]. To obtain this goal, we first define an uncertain variable with respect to the minimum cost in each confidence level. If all costs are independently linear distributed, we present the inverse distribution function of this uncertain variable in [formula]time, where n is the number of vertices in the tree.
    Źródło:
    Opuscula Mathematica; 2016, 36, 4; 513-523
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of the chosen field-weakening methods for the Direct Rotor Flux Oriented Control drive system
    Autorzy:
    Nguyen, K.
    Orłowska-Kowalska, T.
    Tarchała, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/140832.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    induction motor
    optimal field-weakening
    DRFOC
    Opis:
    In this paper, an analysis of the induction motor control scheme based on the Direct Rotor Flux Oriented Control (DRFOC) for a whole speed range, including fieldweakening (FW) regions is presented. Two field-weakening algorithms have been compared and verified through simulation with a 3.0 [kW] induction motor drive.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 443-454
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence Spectra of ZnAl$\text{}_{2}$O$\text{}_{4}$:Cr$\text{}^{3+}$ Spinel Nanopowders
    Autorzy:
    Luc, H. H.
    Nguyen, T. K.
    Nguyen, V. M.
    Suchocki, A.
    Kamińska, A.
    Le, V. K.
    Nguyen, V. H.
    Luong, T. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037040.pdf
    Data publikacji:
    2003-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.60.-b
    72.80.Ga
    81.05.Je
    81.05.Mh
    Opis:
    The synthetic ZnAl$\text{}_{2}$O$\text{}_{4}$ spinels doped with Cr$\text{}^{3+}$ ions are prepared from ZnSO$\text{}_{4}$, Al$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$, and Cr$\text{}_{2}$(SO$\text{}_{4}$)$\text{}_{3}$. The spinel single phase is detected from X-ray diffraction. Luminescence properties of Cr$\text{}^{3+}$ in ZnAl$\text{}_{2}$O$\text{}_{4}$ were studied by low temperature luminescence and decay measurements. Four luminescence lines at 14570, 14520, 14460, and 14330 cm$\text{}^{-1}$ were found to originate from structure distortion and the line at 14175 cm$\text{}^{-1}$ - from chromium pairs. The broad emission band at about 13540 cm$\text{}^{-1}$ is considered to arise from a new Cr$\text{}^{3+}$ center in ZnCr$\text{}_{2}$O$\text{}_{4}$.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 6; 581-587
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concrete grade change in the layers of three-layer steel fibre reinforced concrete beams
    Autorzy:
    Lam, T. Q. K.
    Do, T. M. D.
    Ngo, V. T.
    Nguyen, T. T. N.
    Pham, D. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818828.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    steel fibre concrete
    stress-strain
    crack
    material nonlinear
    multi-layer beams
    concrete grade
    beton
    włókno stalowe
    naprężenie-odkształcenie
    pęknięcie
    materiał nieliniowy
    belki wielowarstwowe
    klasa betonu
    Opis:
    Purpose: Determine the state of stress-strain, formation and development cracks, three-layer beam diagrams of load-compression stress, load-tension stress, load-vertical displacement relationships with a change in concrete grade. Design/methodology/approach: This paper presents the results of an ANSYS numerical simulation analysis involving stress-strain state and cracking of the steel fiber concrete layers of three-layer reinforced concrete beams with the upper and lower layers. With a cross-section of 150x300 mm, a total span of 2200 mm and an effective length of 2000 mm, the middle is a normal concrete layer. Under two-point loads, all the beam samples were tested. The research simulated three-layer concrete beams in different layers of beams with a change in concrete grade, and compared with and without the use of steel fibers in layers of concrete beams, including the nonlinearity of the material considered. Findings: A diagram of the formation and development of cracks in three-layer concrete beams has been constructed by the study results, determining the load at which the concrete beams begin to crack, the load at which the concrete beams are damaged. In the middle of three-layer steel fiber reinforced concrete beams, load-compression stress, loadtension stress, load-vertical displacement relationships are established. Study results show that these three-layer concrete beams appear to crack earlier than in other cases in cases 2 and 3, but the beam bearing capacity is damaged at 67 kN, the earliest in case 3. And case 6 at 116 kN is the latest. The effects of case 1 and case 3 are small compared with and without the use of steel fibers in cases, while the effects of case 5 and case 6 are very high. Research limitations/implications: The research focuses only on the change of concrete grade in the layers, but the input parameters affecting three-layer steel fiber concrete beams have not been researched, such as the number of tensile steel bars, tensile steel bar diameter, steel fiber content in concrete, thickness variation in three-layer concrete beam layers, etc. Practical implications: Provides a result of experimental study and ANSYS numerical simulation in multi-layer steel fiber concrete beams. Originality/value: The analysis of multi-layered steel fiber concrete beams using experimental and simulation methods shows that other parameters influencing the beams will continue to analysis the working stages of three-layer beams.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 102, 1; 16--29
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of water supply networks for water transfer to the urban area Case study: Balikpapan city
    Autorzy:
    Huy, Dinh T.N.
    Dwijendra, Ngakan K.A.
    Poltarykhin, Andrey
    Suksatan, Wanich
    Nahi, Nooraldeen S.
    Mahmudiono, Trias
    Hai, Nguyen T.
    Kadhim, Mustafa M.
    Singh, Krishanveer
    Ahmed, Alim A.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174373.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    network design
    water distribution
    water shortage
    water supply network
    water transmission
    Opis:
    The growing population and the development of industries in all countries of the world have created a very important and complex issue for water supply to cities. Today, many parts of the world are facing the problem of water shortage and this problem cannot be easily solved. In addition to the proper use of water resources and preventing the loss of natural water, the establishment of regional water supply networks is effective in meeting the future needs of the people. A water distribution network (water supply network) is a set of interconnected pipelines used to transport and distribute water in a complex. In designing the water distribution network, factors such as the type of water distribution network, water pressure, water velocity, design flow, minimum pipe diameter, pipe material and many other factors should be considered. In this study, we have tried to design the water supply network of a part of Balikpapan city in Indonesia. The design method led to the determination of pressure values in the connection nodes, pipe diameters, flow rate and velocity in the pipes. All the existing criteria are considered in the design of the water supply network. Although this study has been implemented for a specific study area, it can be of great help to designers in designing the water supply network.
    Źródło:
    Journal of Water and Land Development; 2022, 54; 251--254
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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