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An Enhanced Ensemble-Based Long Short-Term Memory Approach for Traffic Volume Prediction

Computers, Materials & Continua 2024年第3期78卷 3585-3602页

作者： Duy quang tran Huy Q.tran Minh van Nguyen Faculty of Civil Engineering Nha Trang UniversityNha Trang650000Vietnam Robotics and Mechatronics Research Group Faculty of Engineering and TechnologyNguyen Tat Thanh UniversityHo Chi Minh City700000Vietnam Department of Civil Engineering Ho Chi Minh City University of Technology and EducationHo Chi Minh City700000Vietnam

With the advancement of artificial intelligence,traffic forecasting is gaining more and more interest in optimizing route planning and enhancing service *** volume is an influential parameter for planning and operating traffic *** study proposed an improved ensemble-based deep learning method to solve traffic volume prediction problems.A set of optimal hyperparameters is also applied for the suggested approach to improve the performance of the learning *** fusion of these methodologies aims to harness ensemble empirical mode decomposition’s capacity to discern complex traffic patterns and long short-term memory’s proficiency in learning temporal ***,a dataset for automatic vehicle identification is obtained and utilized in the preprocessing stage of the ensemble empirical mode decomposition *** second aspect involves predicting traffic volume using the long short-term memory ***,the study employs a trial-and-error approach to select a set of optimal hyperparameters,including the lookback window,the number of neurons in the hidden layers,and the gradient descent ***,the fusion of the obtained results leads to a final traffic volume *** experimental results show that the proposed method outperforms other benchmarks regarding various evaluation measures,including mean absolute error,root mean squared error,mean absolute percentage error,and *** achieved R-squared value reaches an impressive 98%,while the other evaluation indices surpass the *** findings highlight the accuracy of traffic pattern ***,this offers promising prospects for enhancing transportation management systems and urban infrastructure planning.

关键词： Ensemble empirical mode decomposition traffic volume prediction long short-term memory optimal hyperparameters deep learning

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GLOBAL BOUND ON THE GRADIENT OF SOLUTIONS TO p-LAPLACE TYPE EQUATIONS WITH MIXED DATA

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Acta Mathematica Scientia 2024年第4期44卷 1394-1414页

作者： Minh-Phuong tran The-quang tran Thanh-Nhan NGUYEN Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Nguyen Huu Huan High School Thu Duc CityVietnam Group of Analysis and Applied Mathematics Department of MathematicsHo Chi Minh City University of EducationVietnam

In this paper,the study of gradient regularity for solutions of a class of elliptic problems of p-Laplace type is *** particular,we prove a global result concerning Lorentz-Morrey regularity of the non-homogeneous boundary data problem:-div((s^(2)+|▽u|^(2)p-2/2)▽u)=-div(|f|^(p-2)f)+g inΩ,u=h in■Ω,with the(sub-elliptic)degeneracy condition s∈[0,1]and with mixed data f∈L^(p)(Q;R^(n)),g∈Lp/(p-1)(Ω;R^(n))for p∈(1,n).This problem naturally arises in various applications such as dynamics of non-Newtonian fluid theory,electro-rheology,radiation of heat,plastic moulding and many *** on the idea of level-set inequality on fractional maximal distribution functions,it enables us to carry out a global regularity result of the solution via fractional maximal *** to the significance of M_(α)and its relation with Riesz potential,estimates via fractional maximal functions allow us to bound oscillations not only for solution but also its fractional derivatives of orderα.Our approach therefore has its own interest.

关键词： gradient estimates p-Laplace quasilinear elliptic equation fractional maximal operators Lorentz-Morrey spaces

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A comparative study on kinetics and dynamics of two dump truck lifting mechanisms using MATLAB simscape

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 146-156页

作者： Thong Duc Hong Minh quang Pham Son Cong tran Lam quang tran Truong Thanh Nguyen Faculty of transportation Engineering Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City(VNU-HCM) Ho Chi Minh City 700000Vietnam Industrial Maintenance Training Center Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam

In this paper,two lifting mechanism models with opposing placements,which use the same hydraulic hoist model and have the same angle of 50°,have been *** mechanical and hydraulic simulation models are established using MATLAB Simscape to analyze their kinetics and dynamics in the lifting and holding *** simulation findings are compared to the analytical calculation results in the steady state,and both methods show good *** the early lifting stage,Model 1 produces greater force and discharges goods in the container faster than Model ***,Model 2 reaches a higher force and ejects goods from the container cleaner than its counterpart at the end lifting *** established simulation models can consider the effects of dynamic loads due to inertial moments and forces generated during the system *** is crucial in studying,designing,and optimizing the structure of hydraulic-mechanical systems.

关键词： Dump truck Lifting mechanism Hydraulic MATLAB Simscape Kinetic dynamic analysis

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An In-Depth Analysis of Road Fatal Crash Patterns and Discussions in Ho Chi Minh City

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Journal of Traffic and transportation Engineering 2024年第3期12卷 141-150页

作者： Vuong tran quang Faculty of Civil Engineering Campus in Ho Chi Minh CityUniversity of Transport and CommunicationsHo Chi MinhVietnam

Although there has been a slight decrease in road traffic crashes, fatalities, and injuries in recent years, HCMC (Ho Chi Minh City) will continue to encounter challenges in mitigating and preventing road crashes. This study analyzes road crash data from the past five years, obtained from the Road-Railway Police Bureau (PC08) and TSB (Traffic Safety Board) in HCMC. This analysis gives us valuable insights into road crash patterns, characteristics, and underlying causes. This comprehensive understanding serves as a scientific foundation for developing cohesive strategies and implementing targeted solutions to address road traffic safety issues more effectively in the future.

关键词： Traffic safety safety policies fatal crash patterns

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Push forward LC-MS-based therapeutic drug monitoring and pharmacometabolomics for anti-tuberculosis precision dosing and comprehensive clinical management

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Journal of Pharmaceutical Analysis 2024年第1期14卷 16-38页

作者： Nguyen quang Thu Nguyen tran Nam Tien Nguyen Thi Hai Yen Thuc-Huy Duong Nguyen Phuoc Long Huy Truong Nguyen Department of Pharmacology and PharmacoGenomics Research Center Inje University College of MedicineBusan47392Republic of Korea Department of Chemistry University of EducationHo Chi Minh City700000Viet Nam Faculty of Pharmacy Ton Duc Thang UniversityHo Chi Minh City700000Viet Nam

The spread of tuberculosis(TB),especially multidrug-resistant TB and extensively drug-resistant TB,has strongly motivated the research and development of new anti-TB *** strategies to facilitate drug combinations,including pharmacokinetics-guided dose optimization and toxicology studies of first-and second-line anti-TB drugs have also been introduced and *** chromatography-mass spectrometry(LC-MS)has arguably become the gold standard in the analysis of both endo-and exo-genous *** technique has been applied successfully not only for therapeutic drug monitoring(TDM)but also for pharmacometabolomics *** improves the effectiveness of treatment,reduces adverse drug reactions,and the likelihood of drug resistance development in TB patients by determining dosage regimens that produce concentrations within the therapeutic target *** on TDM,the dose would be optimized individually to achieve favorable *** is essential in generating and validating hypotheses regarding the metabolism of anti-TB drugs,aiding in the discovery of potential biomarkers for TB diagnostics,treatment monitoring,and outcome *** article highlighted the current progresses in TDM of anti-TB drugs based on LC-MS bioassay in the last two ***,we discussed the advantages and disadvantages of this technique in practical *** pressing need for non-invasive sampling approaches and stability studies of anti-TB drugs was ***,we provided perspectives on the prospects of combining LC-MS-based TDM and pharmacometabolomics with other advanced strategies(pharmacometrics,drug and vaccine developments,machine learning/artificial intelligence,among others)to encapsulate in an all-inclusive approach to improve treatment outcomes of TB patients.

关键词： Tuberculosis Therapeutic drug monitoring LC-MS MIPD Pharmacometabolomics Precision medicine

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Building the ARIMA Model for Forecasting the Production of Vietnam’s Coffee Export

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Journal of Applied Mathematics and Physics 2024年第4期12卷 1237-1246页

作者： Duy quang Phung Quoc Thang Trinh quang Truong Do Ngan Giang Nguyen van Ha Nguyen Gia Khiem Ngo Thi Minh Ngoc tran Faculty of Technology and Data Science Foreign Trade University Hanoi Vietnam School of Economics and International Business Foreign Trade University Hanoi Vietnam

Coffee is a significant industry, accounting for 3% of Vietnam’s GDP, with annual export turnover consistently exceeding USD 3 billion. Despite global economic challenges affecting purchasing power at various times, Vietnam’s coffee exports in December 2023 continued to surge, reaching the highest level in the past 9 months at 190,000 tons, a 59.3% increase compared to November 2023, but still a slight 3.5% decrease from the same period last year. The export turnover reached USD 538 million, a 51% increase from November 2023 and a 26.4% increase from the same period last year. Therefore, forecasting the coffee export volume holds significant importance for coffee producers nationwide. This research employs the Box-Jenkins method to construct an ARIMA model for forecasting Vietnam’s coffee export volume based on annual data published by the General Statistics Office. Results indicate that among the models considered, the ARIMA(1, 1, 2) model is the most suitable. The study also provides short-term forecasts for Vietnam’s coffee export volume. However, the current model is limited to forecasting and is not yet optimized, as the assumed linearity in the model is a simplification.

关键词： ARIMA Forecasting Coffee Export Volume Data Science

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Tungsten-based nanocatalysts with different structures for visible light responsive photocatalytic degradation of bisphenol A

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Journal of Environmental Sciences 2024年第5期139卷 569-588页

作者： Hai Bang Truong Thi Thu Loan Doan Nguyen Tien Hoang Nguyen van Tam Minh Kim Nguyen Le Gia Trung Jin Seog Gwag Nguyen Tien tran Optical Materials Research Group Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Applied Technology School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam The University of Da Nang University of Science and Technology54 Nguyen Luong BangDa NangViet Nam The University of Da Nang University of Science and Education459 Ton Duc Thang St.Lien ChieuDa Nang 550000Viet Nam Institute of Veterinary Science and Technology 31ha zoneTrau QuyGia LamHa Noi 12400Viet Nam Department of Physics Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea Center for Advanced Chemistry Institute of Research and DevelopmentDuy Tan University03 Quang TrungDa Nang 550000Viet Nam Faculty of Natural Sciences Duy Tan University03 Quang TrungDa Nang 550000Viet Nam

Environmental pollution,such as water contamination,is a critical issue that must be absolutely ***,three different morphologies of tungsten-based photocatalysts(WO_(3)nanorods,WO_(3)/WS_(2)nanobricks,WO_(3)/WS_(2)nanorods)are made using a simple hydrothermal method by changing the solvents(H_(2)O,DMF,aqueous HCl solution).The as-prepared nanocatalysts have excellent thermal stability,large porosity,and high *** results show all materials have good photocatalytic activity in aqueous media,with WO_(3)/WS_(2)nanorods(NRs)having the best activity in the photodegradation of bisphenol A(BPA)under visible-light *** may originate from increased migration of charge carriers and effective prevention of electron–hole recombination in WO_(3)/WS_(2)NRs,whereby this photocatalyst is able to generate more reactive·OH and·O_(2)^(–)species,leading to greater photocatalytic *** 99.6% of BPA is photodegraded within 60 min when using 1.5 g/L WO_(3)/WS_(2)NRs and 5.0 mg/L BPA at pH ***,the optimal conditions(pH,catalyst dosage,initial BPA concentration)for WO_(3)/WS_(2)NRs are also elaborately *** rod-like heterostructures are expressed as potential catalysts with excellent photostability,efficient reusability,and highly active effectivity in different types of *** particular,the removal efficiency of BPA by WO_(3)/WS_(2)NRs reduces by only 1.5% after five recycling runs and even reaches 89.1%in contaminated lake *** study provides promising insights for the nearly complete removal of BPA from wastewater or different water resources,which is advantageous to various applications in environmental remediation.

关键词： Photodegradation Bisphenol A Tungsten-based nanocatalyst Structure Nanorod

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越南玉米产业发展及市场供需现状分析

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南方农业学报 2022年第4期53卷 1186-1192页

作者：吕荣华邹成林唐茂艳陈雷刘淑仪张晓丽曾媛 tran van quang 吕佳茗广西农业科学院国际合作处广西南宁530007 广西农业科学院玉米研究所广西南宁530007 广西农业科学院水稻研究所广西南宁530007 越南农业大学越南河内100803 广西大学计算机与电子信息学院广西南宁530004

【目的】掌握越南玉米产业发展历程及现状,为中越两国开展科技合作提供决策参考。【方法】基于越南统计局数据,总结归纳越南玉米发展历程、种植生产、进口贸易及各生态区生产情况,对中越玉米在技术和市场等方面的合作进行展望。【结果... 详细信息

【目的】掌握越南玉米产业发展历程及现状,为中越两国开展科技合作提供决策参考。【方法】基于越南统计局数据,总结归纳越南玉米发展历程、种植生产、进口贸易及各生态区生产情况,对中越玉米在技术和市场等方面的合作进行展望。【结果】越南从事玉米育种研究较晚,品种引入,国外品种引进对越南玉米育种和生产发展起重要作用,越南玉米种植面积、单产和总产量自20世纪80年代以来逐年上升,目前种植面积在100万ha左右,总产量在500万t左右,2014年以来呈现逐年下滑趋势。从生态区域来看种植主要集中在北部丘陵山区,2019年北部种植面积61.97万ha,占全越南玉米1/3以上;从省份来看种植面积较大省份有山罗省、多乐省、义安省和清化省,产量来较大省份是多乐省、山罗省、同奈省、清化省、义安省、嘉莱省和得农省;从南北区域来看种植面积和产量主要集中在北部;从栽培条件来看,东南部、九龙江平原和西原地区玉米单产最高,单产较高省份是同塔、坚江、安江和同奈。越南生产的玉米约60%用于食用和生产酒精,40%用于生产饲料。越南生产的玉米满足不了本国需求,需从美国、印度等国进口大量玉米,年进口量100万~180万t,且80%为转基因玉米。种植品种主要有单交玉米GS9989(A380)、VN5885、TC 14-1,鲜食糯玉米品种VN556、甜玉米品种20(DL20)青料饲料两用玉米VS71品种。玉米草地贪夜蛾是危害中越两国迁飞性害虫;同时越南玉米生产中存在品种单一、优良品种匮乏、栽培技术落后制约其玉米产业的发展。【建议】我国相关机构部门应加强与越南玉米研究所和越南农业大学等农业研究部门合作;加大示范推广我国优良玉米品种;在越南登记经示范适用玉米品种;与企业合作将适宜品种出口到越南,加强与东盟国家合作。

关键词：玉米越南农业生态区种植面积栽培技术

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越南香蕉生产概况

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南方农业学报 2014年第12期45卷 2284-2287页

作者：谢春斌温国泉吕荣华曾媛刘忠刘淑仪周行孔令孜韦莉萍 tran van quang 广西农业科学院农业资源与环境研究所广西农业科学院农业科技信息研究所广西农业科学院国际合作处南宁530007 越南国家农业大学越南河内100803

近年来,越南香蕉种植面积稳定在11.00万ha左右,主要集中在九龙江平原及中北部及中部沿海地区,香蕉种植面积最大的省份为九龙江平原的朔庄省(Soc trang);越南香蕉总产量超过160.00万t,2010年产蕉大省青化省(Thanh Hoa)香蕉总产量为13.29... 详细信息

近年来,越南香蕉种植面积稳定在11.00万ha左右,主要集中在九龙江平原及中北部及中部沿海地区,香蕉种植面积最大的省份为九龙江平原的朔庄省(Soc trang);越南香蕉总产量超过160.00万t,2010年产蕉大省青化省(Thanh Hoa)香蕉总产量为13.29万t;越南香蕉单产量约16.00 t/ha,产量最高的省份为红河平原地区兴安省(Hung Yen),单产超过45.00 t/ha。相对广西来说,越南香蕉单产偏低,广西在种蕉与香蕉组培苗技术方面可与越南开展合作,以促进广西香蕉产业在越南的影响力,达到经济效益与社会效益双赢。

关键词：香蕉生产概况农业生态区越南

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越南木薯生产概况

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湖南生态科学学报 2021年第3期8卷 61-68页

作者：吕荣华谢春斌陈雷曾媛 tran van quang 吕佳茗广西农业科学院国际合作处广西南宁530007 广西农业科学院水稻研究所广西南宁530007 越南国家农业大学越南河内100803 广西大学计算机与电子信息学院广西南宁530004

【目的】越南地处热带,光照充足,雨量充沛。通过对越南气候条件、农业生态区域、越南全国、各生态区、部份省份近几年种植木薯面积、单产及总产概况分析,了解越南木薯发展现状和趋势,为我国木薯产业发展提供参考。【方法】基于越南农业... 详细信息

【目的】越南地处热带,光照充足,雨量充沛。通过对越南气候条件、农业生态区域、越南全国、各生态区、部份省份近几年种植木薯面积、单产及总产概况分析,了解越南木薯发展现状和趋势,为我国木薯产业发展提供参考。【方法】基于越南农业统计数据库、越南统计总局网站、越南农业农村部栽培局、越南统计年鉴和越南国情报告年度数据,分析越南全国、各生态区、部份省份近几年木薯发展、种植、生产及贸易概况。【结果】越南纬度跨越大,气候条件差异大,分6个农业生态区。越南木薯种植主要在丘陵山区,在热带地区可全年种植,越南南部是热带地区,北部是亚热带地区,越南种植木薯主要集中在南部,近年来全国种植木薯面积已超过50万公顷,木薯总产已超1000万吨,其中2016年达到最高面积为56.90万公顷,产量达1090.99万吨,2019年种植面积为51.93万公顷,产量984.69万吨;2019年南部种植面积是36.07万公顷,北部只有15.88万公顷,2012年越南木薯及木薯产品出口价值达最高13.514亿美元,2019年为9.669亿美元。【结论】越南地处热带亚热带,北部是亚热带,四季分明,南部是热带,分旱季和雨季。木薯是越南重要的经济作物,越南是全球木薯出口大国,越南木薯及木薯产品出口价值10亿美元左右,全球排名第二。我国广西等西南地区与越南相邻,有比较相似的气候和环境条件,合作的空间和潜力有广阔的前景。

关键词：越南木薯概况农业生态区

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