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A fully automated framework for helicopter rotor blades design and analysis including aerodynamics,structure, and manufacturing

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Chinese Journal of Aeronautics 2016年第6期29卷 1602-1617页

作者： Ngoc Anh Vu Jae Woo lee Tuan Phuong Nam le Song Thanh Thao Nguyen Division of Computational Mechatronics Institute for Computational Science Ton Duc Thang University Faculty of Electrical & Electronics Engineering Ton Duc Thang University Department of Aerospace Information Engineering Konkuk University Faculty of Mechanical Engineering Industrial University of Ho Chi Minh City Department of Aerospace Engineering Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City

This study describes an integrated framework in which basic aerospace engineering aspects(performance, aerodynamics, and structure) and practical aspects(configuration visualization and manufacturing) are coupled and considered in one fully automated design optimization of rotor blades. A number of codes are developed to robustly perform estimation of helicopter configuration from sizing, performance analysis, trim analysis, to rotor blades configuration representation. These codes are then integrated with a two-dimensional airfoil analysis tool to fully design rotor blades configuration including rotor planform and airfoil shape for optimal aerodynamics in both hover and forward flights. A modular structure design methodology is developed for realistic composite rotor blades with a sophisticated cross-sectional geometry. A D-spar cross-sectional structure is chosen as a baseline. The framework is able to analyze all realistic inner configurations including thicknesses of D-spar, skin, web, number and ply angles of layers of each composite part,and materials. A number of codes and commercial software(ANSYS, Gridgen, VABS, Pre VABS,etc.) are implemented to automate the structural analysis from aerodynamic data processing to sectional properties and stress analysis. An integrated model for manufacturing cost estimation ofcomposite rotor blades developed at the Aerodynamic Analysis and Design Laboratory(AADL),Aerospace Information Engineering Department, Konkuk University is integrated into the framework to provide a rapid and dynamic feedback to configuration design. The integration of three modules has constructed a framework where the size of a helicopter, aerodynamic performance analysis, structure analysis, and manufacturing cost estimation could be quickly investigated. All aspects of a rotor blade including planform, airfoil shape, and inner structure are considered in a multidisciplinary design optimization without an exception of critical configuration.

关键词： Design optimization Helicopter rotor blades Integrated framework Modular structure design methodology Perform estimation

Effects of asphalt types and aging on healing performance of asphalt mixtures using induction heating method

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第2期7卷 227-236页

作者： Hai Viet Vo Dae-Wook Park Jung-Woo Seo Tri Ho Minh le Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam Department of Civil Engineering Kunsan National UniversityKimsan 54150South Korea

This paper investigates the effects of types and aging of asphalt binder on healing performance of asphalt mixture modified with steel wool fibers(SWF)using induction heating *** binders PG58-22,PG64-22 and PG76-22,widely used in Korea,were applied in this *** rolling thin film oven(RTFO)and pressure ageing vessel(PAV)tests were conducted to simulate the aging process of asphalt *** healing performance of mixtures was evaluated by the crack-heal process,which included semi-circular bending and induction heating *** cooking oil waste was used as a rejuvenator in order to refresh the aged binder and its healing performance was also *** results indicated that the performance grade(PG)of asphalt binder slightly affected the healing performance of mixtures due to the difference of binder *** addition,the healing level of asphalt mixture was reduced significantly by aged asphalt ***,it was found that using cooking oil waste as a rejuvenator for the aged asphalt mixture can improve its healing performance.

关键词： Asphalt mixture Induction heating Steel wool fibers Healing Aging Cooking oil waste

Novel enzymatically crosslinked chitosan hydrogels with free-radical-scavenging property and promoted cellular behaviors under hyperglycemia

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Progress in Natural Science:Materials International 2020年第5期30卷 661-668页

作者： Dieu Linh Tran Phuong le Thi Thai Thanh Hoang Thi Ki Dong Park Department of Molecular Science and Technology Ajou University Biomaterials and Nanotechnology Research Group Faculty of Applied Sciences Ton Duc Thang University

The impairment of regenerative processes induced by high blood-glucose level(hyperglycemia) and excessive reactive oxygen species(ROS) contributes to the diabetic complication progression and development. In this study, an injectable, in situ crosslinkable chitosan hydrogel with ROS-scavenging capability was developed by conjugating gallic acid onto the chitosan backbone(CGA). We hypothesized that gallic acid serves as both antioxidant and crosslinking moieties to form hydrogel in situ by means of enzymatic crosslinking with horseradish peroxidase(HRP). The rapid gelation(from 30 s) was observed by vial tilting. The mechanical properties and microstructures of CGA hydrogels can be well controlled by varying the concentrations of H2O2. The ROSscavenging ability of these CGA hydrogels was demonstrated against DPPH radical, hydroxyl radical, and total reducing power. Notably, in an in vitro hyperglycemia environment, CGA hydrogels significantly improved the proliferation and migration of human dermal fibroblast cells, which are closely related to diabetic wound healing. These results suggest that CGA hydrogels have potential as advanced materials for the treatment of diabetes-related diseases via attenuating the excessive ROS production and improving cellular behaviors.

关键词： Chitosan Gallic acid Injectable hydrogel Hyperglycemia Free-radical-scavenging

Dealing with the Class Imbalance Problem in the Detection of Fake Job Descriptions

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Computers, Materials & Continua 2021年第7期68卷 521-535页

作者： Minh Thanh Vo Anh H.Vo Trang Nguyen Rohit Sharma Tuong le Faculty of Information Technology Ho Chi Minh City University of Technology(HUTECH)Ho Chi Minh CityVietnam Faculty of Information Technology Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Information Technology Ho Chi Minh City Open UniversityHo Chi Minh CityVietnam Department of Electronics&Communication Engineering SRM Institute of Science and TechnologyNCR CampusGhaziabadIndia Informetrics Research Group Ton Duc Thang UniversityHo Chi Minh CityVietnam

In recent years,the detection of fake job descriptions has become increasingly necessary because social networking has changed the way people access burgeoning information in the internet *** fraud in job descriptions can help jobseekers to avoid many of the risks of job ***,the problem of detecting fake job descriptions comes up against the problem of class imbalance when the number of genuine jobs exceeds the number of fake *** causes a reduction in the predictability and performance of traditional machine learning *** therefore present an efficient framework that uses an oversampling technique called FJD-OT(Fake Job Description Detection Using Oversampling Techniques)to improve the predictability of detecting fake job *** the proposed framework,we apply several techniques including the removal of stop words and the use of a tokenizer to preprocess the text data in the first *** then use a bag of words in combination with the term frequency-inverse document frequency(TF-IDF)approach to extract the features from the text data to create the feature dataset in the second ***,our framework applies k-fold cross-validation,a commonly used technique to test the effectiveness of machine learning models,that splits the experimental dataset[the Employment Scam Aegean(ESA)dataset in our study]into training and test sets for *** training set is passed through the third module,an oversampling module in which the SVMSMOTE method is used to balance data before training the classifiers in the last *** experimental results indicate that the proposed approach significantly improves the predictability of fake job description detection on the ESA dataset based on several popular performance metrics.

关键词： Fake job description detection class imbalance problem oversampling techniques

A deep feed-forward neural network for damage detection in functionally graded carbon nanotube-reinforced composite plates using modal kinetic energy

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1453-1479页

作者： Huy Q.le Tam T.TRUONG D.DINH-CONG T.NGUYEN-THOI Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh City 700000Vietnam Faculty of Civil Engineering Ho Chi Minh City University of TransportHo Chi Minh City 700000Vietnam Division of Construction Computation Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh City 700000Vietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh City 700000Vietnam

This paper proposes a new Deep Feed-forward Neural Network(DFNN)approach for damage detection in functionally graded carbon nanotube-reinforced composite(FG-CNTRC)*** the proposed approach,the DFNN model is developed based on a data set containing 20000 samples of damage scenarios,obtained via finite element(FE)simulation,of the FG-CNTRC *** elemental modal kinetic energy(MKE)values,calculated from natural frequencies and translational nodal displacements of the structures,are utilized as input of the DFNN model while the damage locations and corresponding severities are considered as *** state-of-the art Exponential Linear Units(ELU)activation function and the Adamax algorithm are employed to train the DFNN ***,in order to enhance the performance of the DFNN model,the mini-batch and early-stopping techniques are applied to the training process.A trial-and-error procedure is implemented to determine suitable parameters of the network such as the number of hidden layers and the number of neurons in each *** accuracy and capability of the proposed DFNN model are illustrated through two distinct configurations of the CNT-fibers constituting the FG-CNTRC plates including uniform distribution(UD)and functionally graded-V distribution(FG-VD).Furthermore,the performance and stability of the DFNN model with the consideration of noise effects on the input data are also *** results indicate that the proposed DFNN model is able to give sufficiently accurate damage detection outcomes for the FG-CNTRC plates for both cases of noise-free and noise-influenced data.

关键词： damage detection deep feed-forward neural networks functionally graded carbon nanotube-reinforced composite plates modal kinetic energy

Lithium-conductive LiNbO_(3) coated high-voltage LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathode with enhanced rate and cyclability

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Green Energy & Environment 2022年第2期7卷 266-274页

作者： Haifeng Yu Shouliang Wang Yanjie Hu Guanjie He le Quoc Bao Ivan P.Parkin Hao Jiang Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Christopher Ingold Laboratory Department of ChemistryUniversity College London20 Gordon StreetLondonWC1H 0AJUK Faculty of Applied Sciences Ton Duc Thang University19 Nguyen Huu ThoDistrict 7Ho Chi Minh CityViet Nam

LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523) cathode materials can operate at extremely high voltages and have exceptional energy ***,their use is limited by inherent structure instability during charge/discharge and exceptionally oxidizing Ni^(4+)at the ***,we have developed a citrate-assisted deposition concept to achieve a uniform lithium-conductive LiNbO_(3) coating layer on the NCM523 surface that avoids self-nucleation of Nb-contained compounds in solution *** electrode-electrolyte interface is therefore stabilized by physically blocking the detrimental parasitic reactions and Ni^(4+)dissolution whilst still maintaining high Li+***,the modified NCM523 exhibits an encouraging Li-storage specific capacity of 207.4 m Ah g-1at 0.2 C and 128.9 m Ah g-1 at 10 C over the range 3.0-4.5 ***,a 92% capacity retention was obtained after 100 cycles at 1 C,much higher than that of the pristine NCM523(73%).This surface engineering strategy can be extended to modify other Ni-rich cathode materials with durable electrochemical performances.

关键词： coating exceptional Lithium

Novel Z-Scheme ZnIn_(2)S_(4)-based photocatalysts for solar-driven environmental and energy applications: Progress and perspectives

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Journal of Materials Science & Technology 2021年第28期87卷 234-257页

作者： Yogesh Kumar Rohit Kumar Pankaj Raizada Aftab Aslam Parwaz Khan Quyet Van le Pardeep Singh Van-Huy Nguyen School of Advanced Chemical Sciences Shoolini UniversitySolanHP173229India Department of Chemistry Government Degree CollegeSolanHP173212India Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Applied Sciences Ton Duc Thang UniversityHo Chi Minh CityVietnam

Benefiting from strong redox ability,improved charge transport,and enhanced charge separation,Zscheme heterostructures of ZnIn_(2)S_(4) based photocatalysts have received considerable interest to tackle energy needs and environmental *** present review highlights the properties of ZnIn_(2)S_(4),which make it a promising photocatalyst,and a suitable combination with oxidation photocatalyst to form Zscheme,leading to improve their photocatalytic properties *** the central part of this review,various types of Z-scheme heterojunction developed recently based on ZnIn_(2)S_(4) and their application in pollutant degradation,water splitting,CO_(2) reduction,and toxic metals *** analytical techniques to detect or trap the active radical and study the charge separation and lifetime of charge carriers in these Z-schemes are *** review offers its readers a broad optical window for the structural architecture of ZnIn_(2)S_(4)-based Z-schemes,photocatalytic activity,stability,and their technological ***,we discuss the challenges and opportunities for further development on Z-Scheme ZnIn_(2)S_(4)-based photocatalysts toward energy and environmental applications based on the recent progress.

关键词： ZnIn_(2)S_(4) Z-scheme photocatalyst Charge transfer mechanism Pollutant degradation Environmental remediation

Predicting residue contacts for protein-protein interactions by integration of multiple information

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Journal of Biomedical Science and Engineering 2014年第1期7卷 28-37页

作者： Tu Kien T. le Osamu Hirose Vu Anh Tran Thammakorn Saethang Lan Anh T. Nguyen Xuan Tho Dang duc Luu Ngo Mamoru Kubo Yoichi Yamada Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Institute of Science and Engineering Kanazawa University Kanazawa Japan

Detailed knowledge of interfacial region between interacting proteins is not only helpful in annotating function for proteins, but also very important for structure-based drug design and disease treatment. However, this is one of the most difficult tasks and current methods are constrained by some factors. In this study, we developed a new method to predict residue-residue contacts of two interacting protein domains by integrating information about evolutionary couplings andamino acid pairwise contact potentials, as well as domain-domain interaction interfaces. The experimental results showed that our proposed method outperformed the previous method with the same datasets. Moreover, the method promises an improvement in the source of template-based protein docking.

关键词： Residue-Residue Contacts Domain-Domain Interactions Protein-Protein Interactions Domain Interfaces Residue Co-Evolution Contact Potentials

Assessment of Radiation Dose Caused by Radioactive Gaseous Effluent Released from Nuclear Power Plant Ninh Thuan 1 under Scenario of Normal Working Conditions

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World Journal of Nuclear Science and Technology 2015年第3期5卷 183-191页

作者： Nguyen Tuan Khai Do Xuan Anh le Dinh Cuong Duong duc Thang Vuong Thu Bac Nguyen Thi Thu Ha Nguyen Quang Long Trinh Van Giap Nguyen Hao Quang Institute for Nuclear Science and Technology (INST) Hanoi Vietnam Vietnam Atomic Energy Institute (VINATOM) Hanoi Vietnam

Based on guides RG 1.109, RG 1.111 published by United States Nuclear Regulatory Commission (USNRC), our research concentrates in assessing radiation doses caused by radioactive substances released from the nuclear power plant (NPP) Ninh Thuan 1 under the scenario of normal operation using software package NRCDose72 provided by the USNRC. The database including the released radioactive nuclides, meteorology, terrain, population and agricultural production activities have been collected and processed to build the input data for the model calculation. The wind rose distribution obtained from the meteorological data in a five-year period from 2009-2013 showed that the radioactive nuclides released to environment spread in two main wind directions which are North East and South West. The X/Q (s/m3) and D/Q (s/m2) qualities which are, respectively, the ratio of activity concentration to release rate and that of deposition density of radioactive nuclides to release rate were calculated within an area of 80 km radius from the NPP site using XOQDOQ. Population doses were calculated using GASPAR. The XOQDOQ and GASPAR are two specific softwares in NRCDose72 package.

关键词： NPP Radioactive Release Radiation Dose Population Dose X/Q and D/Q