Papers by Thanh Thúy Nguyễn
KỶ YẾU HỘI NGHỊ KHOA HỌC CÔNG NGHỆ QUỐC GIA LẦN THỨ XI NGHIÊN CỨU CƠ BẢN VÀ ỨNG DỤNG CÔNG NGHỆ THÔNG TIN
Tái tạo mặt cong từ mô hình lưới mô phỏng bề mặt của đối đượng 3D vẫn đang là vấn đề quan tâm và ... more Tái tạo mặt cong từ mô hình lưới mô phỏng bề mặt của đối đượng 3D vẫn đang là vấn đề quan tâm và có nhiều ứng dụng thực tiễn. Mặt cong tham số B-spline tam giác tái tạo được cho phép biểu diễn các bề mặt có hình dáng đa dạng, thuận tiện khi hiệu chỉnh bề mặt thông qua các đỉnh điều khiển. Bên cạnh các đỉnh điều khiển, vị trí các vectơ nút trên miền tham số cũng ảnh hưởng đến hình dáng của mặt cong B-spline tam giác. Bài viết này để xuất kỹ thuật nhằm xác định các vectơ nút của B-spline tam giác bậc 2, 3, 4 dựa trên tỉ lệ độ lớn giữa các góc, cạnh của các tam giác trên miền tham số, áp dụng cho cả các nút bên trong và nút ở biên. Việc xác định các nút được kiểm tra thỏa điều kiện sinh nút, tránh trường hợp cộng tuyến giữa các nút được tạo ra. Kết quả được áp dụng trong quá trình tái tạo B-spline tam giác từ lưới tam giác 3D ban đầu bằng phương pháp dịch chuyển hình học. Thực nghiệm cho thấy chất lượng của mặt cong B-splỉne tam giác tái tạo được cải thiện rõ rệt.
Tạp chí Y học Việt Nam
Mở đầu: Amikacin là kháng sinh trong nhóm aminoglycosid được sử dụng trong các trường hợp nhiễm... more Mở đầu: Amikacin là kháng sinh trong nhóm aminoglycosid được sử dụng trong các trường hợp nhiễm khuẩn Gram âm nặng. Mục tiêu: Khảo sát tình hình sử dụng amikacin và đánh giá tính phù hợp, độc tính trên thận của việc sử dụng kháng sinh amikacin. Đối tượng và phương pháp: Nghiên cứu cắt ngang mô tả được thực hiện trên 288 hồ sơ bệnh án của bệnh nhân (BN) trên 18 tuổi và có sử dụng amikacin ít nhất 3 ngày từ 01/06/2020 đến 30/12/2020 tại bệnh viện Nhân dân Gia Định. Dữ liệu được thu thập và phân tích từ hồ sơ bệnh án của BN bao gồm các đặc điểm bệnh nhân, đặc điểm vi sinh, đặc điểm sử dụng amikacin, độc tính trên thận, yếu tố ảnh hưởng đến độc tính thận. Kết quả: Tuổi trung bình là 63,39 ± 16,39 tuổi, bệnh nhân nữ chiếm tỷ lệ 56,25%. Trung vị cân nặng là 52 kg, trung vị của BMI là 21,05 kg/m2, tỷ lệ bệnh nhân có suy giảm chức năng thận 40,62%. Nhiễm khuẩn niệu chiếm phần lớn với tỷ lệ 30,72%, tần suất gặp vi khuẩn Gram âm chiếm phần lớn 82,63%, vi khuẩn E.c...
ACM Transactions on Information Systems
With recent advancements in graph neural networks (GNN), GNN-based recommender systems (gRS) have... more With recent advancements in graph neural networks (GNN), GNN-based recommender systems (gRS) have achieved remarkable success in the past few years. Despite this success, existing research reveals that gRSs are still vulnerable to poison attacks , in which the attackers inject fake data to manipulate recommendation results as they desire. This might be due to the fact that existing poison attacks (and countermeasures) are either model-agnostic or specifically designed for traditional recommender algorithms (e.g., neighborhood-based, matrix-factorization-based, or deep-learning-based RSs) that are not gRS. As gRSs are widely adopted in the industry, the problem of how to design poison attacks for gRSs has become a need for robust user experience. Herein, we focus on the use of poison attacks to manipulate item promotion in gRSs. Compared to standard GNNs, attacking gRSs is more challenging due to the heterogeneity of network structure and the entanglement between users and items. To ...
International Journal of Electrical and Computer Engineering (IJECE)
With the advancement of the internet, individuals are becoming more reliant on online application... more With the advancement of the internet, individuals are becoming more reliant on online applications to meet most of their needs. In the meantime, they have very little spare time to devote to the selection and decision-making process. As a result, the need for recommender systems to help tackle this problem is expanding. Recommender systems successfully provide consumers with individualized recommendations on a variety of goods, simplifying their duties. The goal of this research is to create a recommender system for farmers based on tree data structures. Recommender system has become interesting research by simplifying and saving time in the decision-making process of users. We conducted although a lot of research in various fields, there are insufficient in the agriculture sector. This issue is more necessary for farmers in Quangnam-Danang or all Vietnam countries by severe climate features. Storm from that, this research designs a system based on tree data structures. The proposed...
Granular Matter
Increasing seepage flow causes soil particles to migrate, i.e., from local piping to complete flu... more Increasing seepage flow causes soil particles to migrate, i.e., from local piping to complete fluidization, resulting in reduced effectives stress and degraded shear stiffness of the soil foundation. This process has received considerable attention in the past years, however, majority of them concentrate on macro-aspects such as the internal erosion and soil deformation, while there is a lack of fundamental studies addressing the energy transport at micro-scale of fluid-soil systems during soil approaching fluidization. In this regard, the current study presents an assessment of the energy evolution in soil fluidization based on the discrete element method (DEM) coupled with computation fluid dynamics (CFD). In this paper, an upward seepage flow of fluid is modelled by CFD based on the modified Navier–Stokes equations, while soil particles are governed by DEM with their mutual interactions being computed through fluid-particle force models. The energy transformation from the potenti...
International Journal of Electrical and Computer Engineering (IJECE), 2022
Normally web services are classified by the quality of services; however, the term quality is not... more Normally web services are classified by the quality of services; however, the term quality is not absolute and defined relatively. The quality of web services is measured or derived using various parameters like reliability, scalability, flexibility, and availability. The limitation of the methods employing these parameters is that sometimes they are producing similar web services in recommendation lists. To address this research problem, the novel improved clustering-based web service recommendation method is proposed in this paper. This approach is mainly dealing with producing diversity in the results of web service recommendations. In this method, functional interest, quality of service (QoS) preference, and diversity features are combined to produce a unique recommendation list of web services to end-users. To produce the unique recommendation results, we propose a varied web service classification order that is clustering-based on web services’ functional relevance such as non...
BioResources, 2021
The compaction behavior of cotton stalk particle mats, temperature profile inside the particle ma... more The compaction behavior of cotton stalk particle mats, temperature profile inside the particle mats, and influence of surface particle size were studied relative to the properties of three-layered cotton stalk particleboards. Modulus of rupture (MOR), modulus of elasticity (MOE), internal bond, and thickness swelling were used as a measure for mechanical and physical performance. Two types of cotton stalk particleboard were manufactured. Results indicated that compression stiffness of the particle mat increased with increasing particle size; however, it decreased with increasing mat moisture content and temperature. At mat moisture contents of 12% and 18%, the plateau temperature at the centerline was not significantly different between boards having coarse and fine particles. However, the plateau time of boards with coarse particles was significantly lower than that of boards with fine particles. Additionally, thickness swelling of boards with a surface particle size of 2 mm was si...
AsiaCALL Online Journal, 2021
L2 vocabulary learning seems to be one of the biggest challenges for many language major students... more L2 vocabulary learning seems to be one of the biggest challenges for many language major students as lexical knowledge involves productive understanding of its many components, including the form, meaning, and application of the terms (Nation, 2001). It is, therefore, necessary to find appropriate language education tactics and instruments for the successful and efficient acquisition of this aspect of the L2. Among advancements in the field of educational technology, Quizlet was invented with the hope that learners could effectively acquire L2 vocabulary in the absence of the teacher. In this study, the researchers want to figure out if Quizlet is helpful in assisting students in learning English vocabulary. They would also like to identify the difficulties that learners may encounter when using the application for their self-study. A quantitative survey was conducted on 100 English major freshmen and sophomores at a university in Ho Chi Minh City, Vietnam. Results reveal that Quizl...
Advances in Computational Collective Intelligence, 2020
Decrease in visibility causes many difficulties in vision, tracking. Current classic object detec... more Decrease in visibility causes many difficulties in vision, tracking. Current classic object detection techniques do not give satisfying results in less visibility. It is essential to detect and recognize the objects under such conditions and devise a better object detection mechanism. The paper proposes a solution to this problem by using a multi step approach that uses Saliency techniques and modern object detection algorithms to obtain the desired results. The distorted image is enhanced via a deep neural network for visibility enhancement. The image frame of a better quality undergoes saliency techniques so that less visible objects are visible. Faster Region-based Convolutional Neural Network (R-CNN) then runs on the saliency output to yield bounding boxes for all the objects. The coordinates of the bounding boxes are then applied on the original image thus detecting all the objects in a distorted image with less visibility.
FAIR - NGHIÊN CỨU CƠ BẢN VÀ ỨNG DỤNG CÔNG NGHỆ THÔNG TIN - 2016, 2017
Tái tạo mặt cong tham số từ lưới tam giác, đặc biệt là mặt cong tham số bậc thấp, có ý nghĩa quan... more Tái tạo mặt cong tham số từ lưới tam giác, đặc biệt là mặt cong tham số bậc thấp, có ý nghĩa quan trọng và mang lại nhiều ứng dụng thực tiễn trong lĩnh vực tái tạo ngược, thực tại ảo và hỗ trợ thiết kế. Bài báo này đề xuất một phương pháp mới nhằm tái tạo các mặt cong trên miền tham số tam giác có bậc thấp (cụ thể là các mặt Bézier, B-patch và B-spline) dựa trên phương pháp dịch chuyển hình học cục bộ và lược đồ tái hợp mảnh. Bằng cách sử dụng lược đồ tái hợp mảnh nhằm thô hóa lưới điều khiển của mặt cong và điều chỉnh cục bộ các điểm điều khiển thông qua mỗi bước dịch chuyển hình học, các mặt cong được tái tạo xấp xỉ với hầu hết các điểm dữ liệu của lưới tam giác ban đầu mà không cần phải giải các hệ phương trình tuyến tính phức tạp. Độ chính xác của mặt cong tham số tái tạo đạt được bằng cách điều chỉnh vị trí các điểm điều khiển và đám mây nút trong mỗi bước lặp. Các kết quả thực nghiệm cho thấy phương pháp đề xuất đơn giản, mềm dẻo, hiệu quả và có thể áp dụng được với lưới tam giác có hình dạng bất kỳ. Từ khóa-Mặt cong tham số, lưới tam giác, dịch chuyển hình học, tái hợp mảnh, tái tạo mặt cong.
Fibrous geomaterials are widely used in geo-engineering practices for stabilisation, filtration a... more Fibrous geomaterials are widely used in geo-engineering practices for stabilisation, filtration and drainage. Most applications rely on their exceptional hydraulic conductivity despite the current paucity of numerical methods which can simultaneously capture the behaviour of fibre and fluid. In this paper, a coupling numerical approach is proposed where fibres are modelled by Discrete Element Method (DEM) and fluid is simulated by Finite Volume Method (FVM). The Parallel Bond Model incorporated in DEM will reasonably capture the linear stress-strain behaviour of natural fibres such as jute, but unlike previous studies where the fibres are either pre-formed and have an unchanged geometry, the coupling technique provides a good agreement in predicting the hydraulic behaviour of fibrous porous media. The motion of fibres due to fluid flow is also analysed. RÉSUMÉ: Les géomatériaux fibreux sont largement utilisés dans les pratiques de géo-ingénierie par exemple la stabilisation, la filt...
Despite the acknowledged importance of learning communities to students’ learning experiences, cu... more Despite the acknowledged importance of learning communities to students’ learning experiences, cultivating communities in online environments is difficult. This research investigates the promotion of students’ informal online learning communities (OLCs) through suggesting compatible study partners, taking into account students’ characteristics and preferences. Using a Design Science Research approach, a learning partner recommender system was created and evaluated by students, academics, and educational designers. Results highlighted the potential of learning partner recommender systems for facilitating the formation of OLCs amongst students, along with additional secondary benefits. The research also provided important insights into barriers to student adoption of voluntary educational technologies.
CYP2C19 is one of the principal enzymes involved in the antiplatelet prodrug in patients with acu... more CYP2C19 is one of the principal enzymes involved in the antiplatelet prodrug in patients with acute myocardial infraction. Different genotypes can cause various responses to platelet aggregation inhibitors. Therefore, we conduct research to evaluate the relationship between CYP2C19 polymorphisms and platelet aggregation in patients with acute myocardial infraction. The study was processed with a cross-sectional study of patients diagnosed acute myocardial infraction had blood samples tested for the gene CYP2C19 and platelet aggregation. The results in 64 consecutive patients, phenotypes based on genotypes: 59,3% poor and intermediate metabolizer, 40,7% extensive metabolizer. The average platelet aggregation of (poor, intermediate) metabolizer and extensive N.T.T. Mậu và nnk. / Tạp chí Khoa học ĐHQGHN: Khoa học Y Dược, Tập 33, Số 2 (2017) 68-74 74 metabolizer were 29,79±13,6 and 23,27±11,6, respectively, there was a high similarity between the groups (p>0,05). The average platelet...
2017 Seventh International Conference on Image Processing Theory, Tools and Applications (IPTA), 2017
Dynamic texture (DT) is a challenging problem in computer vision because of the chaotic motion of... more Dynamic texture (DT) is a challenging problem in computer vision because of the chaotic motion of textures. We address in this paper a new dynamic texture operator by considering local structure patterns (LSP) and completed local binary patterns (CLBP) for static images in three orthogonal planes to capture spatial-temporal texture structures. Since the typical operator of local binary patterns (LBP), which uses center pixel for thresholding, has some limitations such as sensitivity to noise and near uniform regions, the proposed approach can deal with these drawbacks by using global and local texture information for adaptive thresholding and CLBP for exploiting complementary texture information in three orthogonal planes. Evaluations on different datasets of dynamic textures (UCLA, DynTex, DynTex++) show that our proposal significantly outperforms recent results in the state-of-the-art approaches.
International Journal of Applied Research in Social Sciences, 2020
Virtual reality technology currently tends to develop and apply strongly in all areas of social l... more Virtual reality technology currently tends to develop and apply strongly in all areas of social life. Therefore, the application of virtual reality technology in education and training is becoming more and more urgent. If we know how to effectively exploit and apply virtual reality technology to the design of the education and training process, the teaching of teachers and the acquisition of learners' knowledge will become easy, born dynamic. However, in order to achieve high efficiency, it is necessary to have a creative, flexible and appropriate application based on the actual conditions of each field, each school, the learning ability of learners, the ability to use using modern teaching facilities of teachers, specific subjects
Pediatric Anesthesia, 2019
Comparison of different dosage regimes of epsilon aminocaproic acid on blood loss in children und... more Comparison of different dosage regimes of epsilon aminocaproic acid on blood loss in children undergoing craniosynostosis surgery.
Paediatric anaesthesia, Jan 8, 2018
Children undergoing posterior spinal fusion experience high blood loss often necessitating transf... more Children undergoing posterior spinal fusion experience high blood loss often necessitating transfusion. An appropriately activated coagulation system provides hemostasis during surgery, but pathologic dysregulation can cause progressive bleeding and increased transfusions. Despite receiving antifibrinolytics for clot stabilization, many patients still require transfusions. We sought to examine the association of dilutional coagulopathy with blood loss and blood transfusion in posterior spinal fusion for pediatric scoliosis patients. A retrospective, single institution study of children undergoing posterior spinal fusion >6 levels with a standardized, prospective anesthetic protocol utilizing antifibrinolytics. Blood loss was evaluated using a hematocrit-based calculation. To evaluate transfusions, a normalized Blood Product Transfusion calculation was developed. Factors associated with blood loss and blood transfusions were determined by univariate analysis and multivariate regre...
VNU Journal of Science: Education Research, 2017
Interactive teaching analysis reveals the differences and inclusiveness of interactive teaching m... more Interactive teaching analysis reveals the differences and inclusiveness of interactive teaching methods in all teaching methods. The role and significance of this teaching method in teaching robotics in general and electronics in particular. In teaching activities, to promote learning methods to a higher level is to teach virtual interaction. Learners are not just the center, the focus is on the classroom transition.
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Papers by Thanh Thúy Nguyễn