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Transfer Learning for Disease Diagnosis from Myocardial Perfusion SPECT Imaging

Computers, Materials & Continua 2022年第12期73卷 5925-5941页

作者： Phung Nhu Hai nguyen Chi thanh nguyen thanh trung Tran trung Kien Institute of Information Technology AMSTHanoi11307Vietnam Department of Medical Equipment 108 Military Central HospitalHanoi11610Vietnam

Coronary artery disease(CAD)is one of the most common pathological conditions and the major global cause of *** perfusion imaging(MPI)using single-photon emission computed tomography(SPECT)is a non-invasive method and plays an essential role in diagnosing ***,there is currently a shortage of doctors who can diagnose using SPECT-MPI in developing countries,especially *** on deploying machine learning and deep learning in supporting CAD diagnosis has been noticed for a long ***,these methods require a large dataset and are therefore time-consuming and *** study aims to develop a cost-effective and high-performance CAD classification model to support doctors in these *** this paper,we propose a transfer learning framework for a multi-stage training process with different learning *** process consists of two training stages:a warming up stage in which all layers of a pre-trained model(on ImageNet dataset)are frozen;and a finetuning stage in which a small amount of the top layers are unfrozen and then retrained with a lower learning *** dataset for this study consists of the polar maps from 218 *** popular CNN-based pre-trained models have been investigated,and ResNet152V2-based model has obtained the highest performances with an accuracy of 95.5%,area under the receiver operating characteristic curve(AUC)score 0.932,sensitivity 94.4%,precision 96.4%,and F1-score 95.2%.These performances are competitive or even better than all state-of-the-art approaches in terms of classification accuracy and *** also apply the class activation mapping technique to help explain the model’s predictions and increase the model’s reliability,proving capable of assisting the SPECT image readers in the CAD diagnosis.

关键词： Coronary artery disease deep learning transfer learning SPECTMPI polar maps

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Modeling Election Problem by a Stochastic Differential Equation

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American Journal of Operations Research 2018年第6期8卷 441-447页

作者： nguyen thanh trung Faculty of Fundamental Science Military Academy of Logistics Hanoi Vietnam Faculty of Mathematics Mechanics and Informatics VNU University of Science Hanoi Vietnam

The proportion of the favorable among voters to a nominee might change over times and depend on different factors for example: talent, reputation, party and even name order on election. The unobservable factors which might have minor impacts on the approval rate are modelized by random elements. The approval rate is initially described by the differential equation and then by the random differential equation including the above unobservable factors. We figure out the formula of the solution for the stochastic differential equation and simulate these solutions to identify the changes of the approval rate over time.

关键词： Election Stochastic Differential Equation Ito’s Formula

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Taxonomic notes of three tea-plants(Camellia ***)recently described in Vietnam

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Beverage Plant Research 2022年第1期2卷 174-176页

作者： nguyen trung thanh Luong Van Dung Le Nguyet Hai Ninh Quang Cuong Truong Shixiong Yang Faculty of Biology VNU University of Science334 Nguyen TraiHanoi 100000Vietnam Faculty of Biology Dalat UniversityPhu Dong ThienVuong str.01Dalat66106Lam DongVietnam Faculty of Nong Lam Hoa Lu UniversityNinh Binh 40000Vietnam Bidoup Nui Ba National Park Tran Hung Dao str.5EDalat66116Lam DongVietnam CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina

Camellia sinensis *** is a heterotypic synonym of *** *** flosculora and *** were excluded from ***.

关键词： notes Vietnam Camellia

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The Optimal Stopping Time for Selling an Asset When It Is Uncertain Whether the Price Process Is Increasing or Decreasing When the Horizon Is Infinite

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American Journal of Operations Research 2018年第2期8卷 82-91页

作者： nguyen Khac Minh nguyen thanh trung Pham Van Khanh Thang Long Institute of Mathematics and Applied Science Hanoi Vietnam Faculty of Fundamental Science Military Academy of Logistics Hanoi Vietnam

Assume that we want to shell an asset with unknown drift but known that the drift is a two value random variable, and the initial distribution can be estimated. As time goes by, this distribution is updated and base on the probability of the drift takes the small one gives us the stopping rule. Research results show that the optimal strategy to sell the asset is if the initial probability that the drift receives a small value greater than a certain threshold then liquidates the asset immediately, otherwise the asset holder will wait until the probability of the drift receives a small value passing a certain threshold, it is the optimal time to liquidate the asset.

关键词： Optimal Stopping Time Incomplete Information Probability Process

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三角帆蚌在越南池塘和河道养殖生长发育及环境重要因子分析

三角帆蚌在越南池塘和河道养殖生长发育及环境重要因子分析

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作者： nguyen trung thanh 上海海洋大学

学位级别：硕士

本论文报道了不同养殖模式下三角帆蚌的生长发育及几个环境因子的研究结果。研究内容分为4部分:(1)池塘养殖条件下三角帆蚌生长情况和(2)河道养殖条件下三角帆蚌的生长情况;(3)三角帆蚌的性腺发育评价;(4)养殖水体浮游植物及水质因子分... 详细信息

本论文报道了不同养殖模式下三角帆蚌的生长发育及几个环境因子的研究结果。研究内容分为4部分:(1)池塘养殖条件下三角帆蚌生长情况和(2)河道养殖条件下三角帆蚌的生长情况;(3)三角帆蚌的性腺发育评价;(4)养殖水体浮游植物及水质因子分析。研究结果如下:三角帆蚌的整个生长周期,60至180日龄(秋季后期和冬季前期)壳长、壳宽、壳高是快速增长的阶段,180到270日龄出现增长延缓,180至270日龄(冬季后期和春季前期)是缓慢增长的阶段,尤其是210-240日龄(水温最低)是生长最慢的时间,270至330日龄(春季后期和夏季前期)由于水温逐渐增高所以生长逐渐增快。300至360日龄是增长最快的阶段。360至420日龄增长变慢。实验I(池塘)贝壳性状及体重高于实验II(河道)。池塘内(I)三角帆蚌90日龄三角帆蚌日增长率(ADG)达到最高为壳长0.548mm/日、壳高0.127mm/日、壳宽0.111mm/日,120日龄养殖时ADG为壳长0.388mm/日、壳高0.116mm/日、壳宽0.110mm/日,150日龄时壳长达到0.416mm/日、壳高0.103mm/日、壳宽0.218mm/日。河道内(II)三角帆蚌90日龄壳长、壳高、壳宽增长率分别为0.479mm/日,0.134mm/日,0.147mm/日。ADG结果表明了一个增长的趋势是壳长、壳高、壳宽增长速度最快在90至150日龄,然后ADG在180日龄至240日龄缓慢。池塘内(I)三角帆蚌60-90日龄壳长比生长率(SGR)达到最高(1.389±0.06%/日)和其它阶段差异有统计学意义(P0.05)。ADG最快点在150日龄时(池塘内的三角帆蚌达0.473±0,011(g/日),河道内的三角帆蚌达0.381±0.065(g/日))。150-180日龄日间体重增长速度减慢,池塘为0.059±0.022(g/日),河道为0.085±0.031(g/日)。210-240日龄增长速度更慢,池塘内的三角帆蚌为0.028±0.022(g/日),河道内的三角帆蚌为0.077±0.032(g/日)。240-270 I和II分别为0.412±0.024(g/日)和0.388±0.023(g/日)。三角帆蚌体重比增长速率(SGRw)在60-90日龄阶段达到最高,I和II分别为3.882%/日和4,668%/日。180-210日龄增长最慢,I和II分别为0,079%/日和0.998%/日。在全周期内平均SGRw I和II分别为1.410%/日和1.574%/日,差异没有统计学意义(P>0.05)。120-270日龄SGRw差异不明显(P>0.05)。池塘和河道水体的浮游植物组成十分丰富,包括大约8门,71种类。池塘内绿藻占优势;河道内硅藻占优势。池塘内特征的种类是Pediastrum sp。河道内叶绿素含量高于河道内,池塘内绿藻占78.3%,蓝藻占69.2%;河道内绿藻门占52.2%,蓝藻门占61.5%,河道内藻类主要是硅藻。池塘内的浮游植物量高于河道内,但多样性指数低于河道内。研究的水环境指标包括水温、p H值、透明度(SD)、溶解氧(DO)、盐度(S)、硬度(H)。水温研究时间池塘和河道平均范围分别在25.5 C-36.5 C和24 C-32.5 C。池塘水体的水温最高为36.5C(夏季后期和秋季前期),最低为25.5C(冬季后期和春季前期);河道内最高为32.5C,最低为24 C,二者均在三角帆蚌的适温范围内。平均透明度池塘高于河道(36.79厘米和33.42厘米)。池塘和河道的透明度都在理想范围(30-40厘米)。溶解氧(DO)在高范围内(池塘水体为4.5-6.5mg/l、河道水体为5.5-7mg/l),DO在11月份最低池塘水体为4.5mg/l,河道水体为5.5m

关键词：三角帆蚌生长发育浮游植物水质指标

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Effect of Combinations of Sucrose and Cryoprotectants on the Survival of Catfish Embryos （Pangasidae hypophthamus）

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Journal of Agricultural Science and Technology(B) 2013年第12期3卷 887-892页

作者： nguyen Thi Hong nguyen Thi Nhung nguyen Thi Uoc nguyen trung thanh nguyen Thi Hiep nguyen Van Hanh Pham Van Khanh Ha Thi Ngoc Nga Truong Van Thuong Bui Xuan nguyen Department of Embryo Biotechnology Institute of Biotechnology Vietnam Academy of Science and Technology 18-Hoang QuocViet Hanoi 8404 Vietnam Department of Environment and Pathology Research Institute for Aquaculture No. 2 Cai Be Tien Giang 8473 Vietnam Research Institute for Aquaculture No. 1 Dinh Bang Tu Son Bac Ninh 84241 Vietnam

Although cryopreservation of embryos has been used in most terrestrial animals, the application of this technique has not been succeeded for aquatic animals. In this study, the authors investigate the effect of different combinations of sucrose （SUC, C12H22OH） and cryoprotectants （CPAs） on the survival of the catfish embryos （Pangasidae hypophthalmus） at low temperatures （4, 0 and -20 ℃） for short-term storage. For this aim, embryos with somites and optic cups were exposed to different combinations of sucrose with methanol （SUC ＋ MeOH）, 1.2-propylene glycol （SUC ＋ PROH） and ethylene glycol （SUC ＋ EG） at four concentrations ratios：（1） 0.5 M SUC ＋ 0.5 M CPA; （2） 1 M SUC ＋ 0.5 M CPA; （3） 0.5 M SUC ＋ 1 M CPA; （4） 1 M SUC ＋ 1 M CPA for 40 min at 4, 0 and -20 ℃. Embryos kept in water at room temperature （RT）, 4, 0 and -20℃ were used as controls. The survival rate was expressed as a percentage of hatched embryos per total embryos treated. The results showed that the hatching rate declined significantly when embryos were stored in water at 0 ℃ and -20℃. For embryos at 0 ℃ storage, the highest survival rate （87.78%） was obtained with 1 M SUC ＋ 1 M MeOH combination while at -20 ℃, only embryos in the combined treatments of 0.5 M SUC ＋ 1 MEG and 0.5 M SUC ＋ 1 M PROH reached the hatching stage （40% and 83.33%, respectively）. In conclusion, the results showed that the catfish embryos are sensitive to sub-zero temperatures and the combined treatment of 0.5 M sucrose and 1 M propylene glycol can be used to protect catfish embryos from damages caused by low temperature （0 ℃ and -20 ℃）.

关键词： Catfish cryoprotectants embryos low temperature sucrose.

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Schistosomal appendicitis:A serious and often misdiagnosed condition

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World Journal of Clinical Cases 2025年第10期13卷 62-64页

作者： Phi Duong nguyen thanh Kien Lam Orthopaedic-Burn-Plastic Surgery City Children’s HospitalHo Chi Minh City 71815Viet Nam The Faculty of Medical Technology Van Lang UniversityHo Chi Minh City 700000Viet Nam

Schistosomal appendicitis(SA)is a rare but serious complication of schistosomiasis,a parasitic disease affecting over 250 million people worldwide.A recent retrospective study by Wang et al provides important insights into the clinicopathological characteristics of *** study compared 136 cases of SA to 5418 cases of non-SA over a ten-year *** findings include a higher average age of SA patients(61.73 years vs 35.8 years for non-SA),a higher proportion of acute on chronic appendicitis(33.1%vs 16%),and a significantly higher incidence of colorectal cancer(11.7%vs 2.2%).Despite these differences,SA remains a diagnostic challenge due to its nonspecific clinical presentation and lack of specific laboratory *** study also highlights the persistent prevalence of SA,accounting for 1.6%-3.4%of all appendicitis cases each year from 2013 to *** findings underscore the need for enhanced awareness,early detection,and prompt treatment of SA in endemic *** the association with colorectal cancer,patients with SA require thorough screening and *** research into the pathogenesis and diagnostic markers of SA is *** the global battle against schistosomiasis continues,targeted efforts to diagnose and manage SA can significantly improve patient outcomes.

关键词： Schistosomal appendicitis Schistosomiasis Colorectal cancer Misdiagnosis Clinicopathological characteristics

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Static and free vibration analyses of functionally graded porous variable-thickness plates using an edge-based smoothed finite element method

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Defence Technology（防务技术） 2021年第3期17卷 971-986页

作者： trung thanh Tran Quoc-Hoa Pham trung nguyen-Thoi Department of Mechanics Le Quy Don Technical UniversityHanoiViet Nam Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

The main purpose of this paper is to present numerical results of static bending and free vibration of functionally graded porous(FGP) variable-thickness plates by using an edge-based smoothed finite element method(ES-FEM) associate with the mixed interpolation of tensorial components technique for the three-node triangular element(MITC3), so-called ES-MITC3. This ES-MITC3 element is performed to eliminate the shear locking problem and to enhance the accuracy of the existing MITC3 element. In the ES-MITC3 element, the stiffness matrices are obtained by using the strain smoothing technique over the smoothing domains formed by two adjacent MITC3 triangular elements sharing an edge. Materials of the plate are FGP with a power-law index(k) and maximum porosity distributions(U) in the forms of cosine functions. The influences of some geometric parameters, material properties on static bending, and natural frequency of the FGP variable-thickness plates are examined in detail.

关键词： Functionally graded porous(FGP)plates Edge-based smoothed finite element method(ES-FEM) Mixed interpolation of tensorial components(MITC) Static bending Free vibration

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A novel finite element formulation for static bending analysis of functionally graded porous sandwich plates

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1599-1620页

作者： Van Chinh nguyen trung thanh TRAN trung nguyen-THOI Quoc-Hoa PHAM Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiVietnam Laboratory for Applied and Industrial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityVietnam Faculty of Mechanical-Electrical and Computer Engineering Van Lang UniversityHo Chi Minh CityVietnam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich *** FGP sandwich plates consist of three layers including the bottom skin of homogeneous metal,the top skin of fully ceramic and the FGP core layer with uneven porosity distribution.A quadrilateral(Q4)element with nine degrees of freedom(DOFs)per node is derived and employed in analyzing the static bending response of the plate under uniform and/or sinusoidally distributed *** accuracy of the present finite element formulation is verified by comparing the obtained numerical results with the published results in the ***,some numerical examples are performed to examine the effects of the parameters including power-law index k and porosity coefficient on the static bending response of rectangular FGP sandwich *** addition,a problem with a complicated L-shape model is conducted to illustrate the superiority of the proposed finite element method.

关键词： sandwich plates functionally graded porous static bending Quasi-3D theory Q4 element

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Marketing Strategies Evaluation and Selection for Supply Chain Management Under Uncertainty

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Computers, Materials & Continua 2022年第12期73卷 6535-6546页

作者： Ngo Quang trung nguyen Van thanh Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

Sustainable marketing,often known as green marketing,has grown in popularity over the last two *** is currently putting pressure to encourage firms to become environmentally aware in multiple aspects like human and financial utilization,advertisement,and product *** types of companies are including many environmental campaigns into their own products to take advantage of the *** many scholars have addressed the relevance of green marketing as well as theory development,this study is unique in that it examines both techniques in a fuzzy *** integrated Fuzzy Multicriteria Decision Making Model(MCDM)of the analytical hierarchy process(AHP)and a Portuguese-acronymous MCDM method(TODIM)are used to select the best marketing strategy from five alternatives:(i)Green Design,(ii)Green Positioning,(iii)Green Pricing,(v)Green Packaging,and(iv)Green *** on criteria such as the scale of the green market,price parity,and the commitment of top *** for evaluating green marketing strategies was established in the study as contributions for decisionmakers in this field under unclarified *** research also a useful guideline for ranking alternatives in others industry.

关键词： Green marketing MCDM model sustainable marketing strategy

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