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Backward Dijkstra Algorithms for Finding the Departure Time Based on the Specified Arrival Time for Real-Life Time-Dependent Networks

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Journal of Applied Mathematics and Physics 2016年第1期4卷 1-7页

作者： Gelareh Bakhtyar Vi nguyen Mecit Cetin duc nguyen Department of Civil and Environmental Engineering Old Dominion University Norfolk USA Department of Mechanical and Aerospace Engineering Old Dominion University Norfolk VA USA Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk VA USA

A practical transportation problem for finding the “departure” time at “all source nodes” in order to arrive at “some destination nodes” at specified time for both FIFO (i.e., First In First Out) and Non-FIFO “Dynamic ” Networks is considered in this study. Although shortest path (SP) for dynamic networks have been studied/documented by various researchers, contributions from this present work consists of a sparse matrix storage scheme for efficiently storing large scale sparse network’s connectivity, a concept of Time Delay Factor (TDF) combining with a “general piece- wise linear function” to describe the link cost as a function of time for Non-FIFO links’ costs, and Backward Dijkstra SP Algorithm with simple heuristic rules for rejecting unwanted solutions during the backward search algorithm. Both small-scale (academic) networks as well as large- scale (real-life) networks are investigated in this work to explain and validate the proposed dynamic algorithms. Numerical results obtained from this research work have indicated that the newly proposed dynamic algorithm is reliable, and efficient. Based on the numerical results, the calculated departure time at the source node(s), for a given/specified arrival time at the destination node(s), can be non-unique, for some Non-FIFO networks’ connectivity.

关键词： Backward Dijkstra Dynamic Networks Piece-Wise Linear Function Specified Arrival Time

Analysis of the Differences in Expenditure Levels of Participants at the 2014 Asian Basketball League in Ho Chi Minh City

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Journal of Sports Science 2016年第6期4卷 377-382页

作者： Lam Quang Thanh nguyen Hoang Mirth thuan nguyen Thanh Tu Vietnam Sport Science Institute Viemam Sports Administration Ha Noi Capital 100000 Viet Nam Department of Sport Management University of Sport Hochiminh City Ho Chi Minh City 700000 Viet Nam

Research focuses on studying the economic impacts of 2014 Asian Basketball League in Ho Chi Minh City （hereinaiter referred as ABL 2014） with respect to direct expenditure of all types of participants, including organizers, coaches/athletes, journalists/communicators, audiences, etc. Research was implemented with 920 subjects, including 48 members of the organizing committee, 56 coaches/athletes, 800 audiences and 16 members of journal and media teams.

关键词： Differences level of expenditure participants.

Parameters Effecting on Head Brown Rice Recovery and Energy Consumption of Rubber Roll and Stone Disk Dehusking

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Journal of Agricultural Science and Technology(B) 2015年第6期5卷 383-388页

作者： nguyen duc Canh nguyen Thanh Nghi nguyen Van Hung Center for Agricultural Energy and Machinery Nong Lam University Ho Chi Minh City 700000 Vietnam Crop and Environmental Science Division International Rice Research Institute Metro Manila 1301 Philippines

Application of improper methods on rice processing affects rice quality and head rice recovery. In Vietnam, paddy with different moisture contents （from 13% to 17%） is dehusked by both rubber roll and stone disk. Thus, objective of this research was to evaluate the technical and economic aspects of the two methods. Optimization was conducted with 20 experiments for input factors （moisture content） and output factors （head brown rice recovery, specific energy consumption）. Besides, other factors were also monitored, such as the gap between the two disks, speed of disk and roll, and pressure of rubber roll on paddy. Test results showed that the maximum value of head brown rice （77.4%） and the minimum value of specific energy consumption （0.66 kWh/ton） corresponding to moisture content of paddy of 13.7% for stone disk dehusker. At similar moisture content （13.7%）, head brown rice recovery and specific energy consumption were 77.2% and 1.04 kWh/ton for rubber roll dehusker, respectively. As the result, specific energy consumption of rubber roll dehusker was higher than that of stone disk dehusker, corresponding to the higher dehusking efficiency.

关键词： Paddy moisture content rubber roll dehusker stone disk dehusker head mill rice recovery energy consumption.

Does Customer Experience Management Impact Customer Loyalty Shopping at Supermarket？ The Case in the Mekong Delta, Vietnam

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Economics World 2018年第1期6卷 13-21页

作者： Luu Tien thuan nguyen Huynh Bao Ngoc nguyen Thu Nha Trang Can Tho University Can Tho Vietnam

This research analyzes and answers the question ＂Does customer experience management impact to customer loyalty shopping at supermarket, in the case of Mekong Delta, Vietnam？＂, 321 customers of supermarkets in the Mekong Delta were interviewed by questionnaire. The descriptive statistics, factor analysis, Cronbach＇s alpha, structural equation modeling, and multi-group structural analysis methods were used in this study. The results confirm that customer experience management impacts to customer loyalty shopping at supermarkets. There are six components of customer experience management including brand name, space, commodity, staff, parking lot, and the presence of other stores in supermarkets. In particular, the commodity composition has the strongest impact on customer experience management and satisfaction and directly influences on customer loyalty. In addition, elements of customer experience management affect customer loyalty indirectly through sensory experience, social experience, and satisfaction. The results of multivariate analysis show that age group, spending per shopping at supermarkets, and marital status of the client do not change the relationships in the research model. Meanwhile, the relationship of the different models of the client group income, gender, education, occupation and customers is different. This study adds value to consumer behavior and customer experience management literature.

关键词： customer experience management customer loyalty satisfaction supermarket

Seasonal and geographical distribution of bacillary dysentery(shigellosis)and associated climate risk factors in Kon Tum Province in Vietnam from 1999 to 2013

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Infectious Diseases of Poverty 2017年第1期6卷 1012-1022页

作者： Hu Suk Lee TTHa Hoang Phuc Pham-duc Mihye Lee Delia Grace Dac Cam Phung Vu Minh Thuc Hung nguyen-Viet International Livestock Research Institute(ILRI) Room 301-302B1 BuildingVan Phuc Diplomatic Compound298 Kim Ma StreetBa Dinh DistrictHanoiVietnam Department of Bacteriology National Institute of Hygiene and EpidemiologyHanoiVietnam Center for Public Health and Ecosystem Research Hanoi University of Public HealthHanoiVietnam Medical Microbiology Department The Royal Bournemouth HospitalBournemouthUK ILRI NairobiKenya Thanh Do University HanoiVietnam

Background:Bacillary dysentery(BD)is an acute bacterial infection of the intestine caused by Shigella spp.,with clinical symptoms ranging from fever to bloody diarrhoea to abdominal cramps to *** Vietnam,enteric bacterial pathogens are an important cause of diarrhoea and most cases in children under 5 years of age are due to Shigella *** serogroups *** and *** are considered to be the most *** main objective of this study was to,for the first time,assess the seasonal patterns and geographic distribution of BD in Vietnam,and to determine the climate risk factors associated with the incidence of BD in Kon Tum Province,where the highest rate of bacillary dysentery was observed from 1999 to ***:The seasonal patterns and geographic distribution of BD was assessed in Vietnam using a seasonaltrend decomposition procedure based on *** addition,negative binomial regression models were used to determine the climate risk factors associated with the incidence of BD in Kon Tum Province,from 1999 to ***:Overall,incidence rates of BD have slightly decreased over time(except for an extremely high incidence in 2012 in the north of Vietnam).The central regions(north/south central coast and central highlands)had relatively high incidence rates,whereas the northwest/east and Red River Delta regions had low incidence ***,seasonal plots showed a high peak in the mid-rainy reason and a second smaller peak in the early or late rainy *** incidence rates significantly increased between May and October(“wet season”)across the *** Kon Tum Province,temperature,humidity,and precipitation were found to be positively associated with the incidence of ***:Our findings provide insights into the seasonal patterns and geographic distribution of BD in Vietnam and its associated climate risk factors in Kon Tum *** study may help clinicians and the general public to better understand the timings of outbr

关键词： Shigella Bacillary dysentery Incidence rate Seasonality Wet season Eco-regions Central regions Vietnam

方解石原位U-Pb测年结合磷灰石裂变径迹方法约束鄂尔多斯盆地西南部构造演化

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石油与天然气地质 2021年第5期42卷 1189-1201页

作者：杨鹏任战利 Jianxin Zhao Ai duc nguyen Yuexing Feng 祁凯王琨页岩油气富集机理与有效开发国家重点实验室北京102206 中国石化油气成藏重点实验室江苏无锡214126 西北大学大陆动力学国家重点实验室陕西西安710069 西北大学地质学系陕西西安710069 Radiogenic Isotope Facility School of Earth and Environmental SciencesThe University of QueenslandBrisbaneQLD 4072Australia

鄂尔多斯盆地下古生界油气资源丰富,盆地西南部下古生界海相碳酸盐岩地层沉积厚度大、有机质丰度较高,烃源岩热演化达到过成熟生干气阶段,但是构造演化缺乏深入研究,早期构造事件具体时限是一个亟待解决的关键科学问题。在详细的野外调... 详细信息

鄂尔多斯盆地下古生界油气资源丰富,盆地西南部下古生界海相碳酸盐岩地层沉积厚度大、有机质丰度较高,烃源岩热演化达到过成熟生干气阶段,但是构造演化缺乏深入研究,早期构造事件具体时限是一个亟待解决的关键科学问题。在详细的野外调查、显微结构特征、原位微量元素分析和区域沉积-埋藏演化历史的约束下,结合下古生界碳酸盐岩地层及其断裂破碎带内次生方解石原位U-Pb测年与磷灰石裂变径迹时间-温度曲线模拟结果,揭示了鄂尔多斯盆地西南部晚奥陶世、晚三叠世、晚侏罗世和早白垩世末期—新生代以来的4期构造事件。结果表明研究区晚奥陶世(452±13)Ma存在一期热液改造事件,可能与加里东期原特提斯洋俯冲闭合密切相关;印支期(214±22)Ma的断裂活动是引起区域构造-热事件的重要原因,印支期构造事件规模有限;燕山期和喜马拉雅期构造活动强烈,造成鄂尔多斯盆地西南部大幅度隆升和强烈剥蚀。盆地西南部多阶段复杂的构造演化历史导致油气保存条件破坏严重,对寻找古生界天然气藏不利,应重视盆地天然气保存条件的研究。研究结果对鄂尔多斯盆地古生界油气勘探工作有重要指导意义。将低温热年代学与断裂带方解石原位U-Pb定年相结合分析构造演化的新思路,为解析复杂叠合盆地盆缘带构造演化及其后期改造过程的研究提供了新途径。

关键词：方解石U-Pb定年裂变径迹构造演化下古生界鄂尔多斯盆地

Eye Strain Detection During Online Learning

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Intelligent Automation & Soft Computing 2023年第3期35卷 3517-3530页

作者： Le Quang Thao Duong duc Cuong Vu Manh Hung Le Thanh Vinh Doan Trong Nghia Dinh Ha Hai nguyen Nhan Nhi Faculty of Physics VNU University of ScienceHanoi100000Vietnam University of Science Vietnam National UniversityHanoi100000Vietnam VNU-HUS High School for Gifted StudentsHanoi100000Vietnam Hanoi-Amsterdam High School for the Gifted Hanoi100000Vietnam

The recent outbreak of the coronavirus disease of 2019(Covid-19)has been causing many disruptions among the education systems worldwide,most of them due to the abrupt transition to online *** sudden upsurge in digital electronic devices usage,namely personal computers,laptops,tablets and smart-phones is unprecedented,which leads to a new wave of both mental and physical health problems among students,for example eye-related *** overexpo-sure to electronic devices,extended screen time usage and lack of outdoor sun-light have put a consequential strain on the student’s ophthalmic health because of their young age and a relative lack of responsibility on their own *** to take appropriate external measures to mitigate the negative effects of this pro-cess could lead to common ophthalmic illnesses such as myopia or more serious *** remedy this situation,we propose a software solution that is able to track and capture images of its users’eyes to detect symptoms of eye illnesses while simultaneously giving them warnings and even offering *** meet the requirements of a small and light model that is operable on low-end devices without information loss,we optimized the original MobileNetV2 model with depth-wise separable convolutions by altering the parameters in the last layers with an aim to minimize the resizing of the input image and obtained a new model which we call *** with applying the knowledge distillation tech-nique and ResNet-18 as a teacher model to train the student model,we have suc-cessfully increased the accuracy of the EyeNet model up to 87.16%and support the development of a model compatible with embedded systems with limited computing power,accessible to all students.

关键词： Digital eye strain Covid-19 online study knowledge distillation eye care EyeNet

Mass Creation from Extra Dimensions

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Journal of Modern Physics 2014年第6期5卷 477-482页

作者： Dao Vong duc nguyen Mong Giao Hung Vuong University Ho Chi Minh City Vietnam Institute of Physics Hanoi Vietnam

In this work we consider a mechanism for mass creation based on the periodicity condition dictated from the compactification of extradimensions. It is shown that the existence and the compactification of extradimensions are the origin for creating particle mass in ordinary 4-dimensional space-time. Mass of Higgs particles themselves would be also originated from the geometric topology of extradimensions.

关键词： Origin of Mass Mass of Higg Particles Extra Dimensions

A New Job Shop Heuristic Algorithm for Machine Scheduling Problems

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Journal of Applied Mathematics and Physics 2017年第11期5卷 2172-2182页

作者： Maryam Ehsaei duc T. nguyen Civil and Environmental Engineering Department Old Dominion University Norfolk VA USA Civil and Environmental Engineering (CEE) and Modeling Simulation and Visualization Engineering (MSVE) Departments Old Dominion University Norfolk VA USA

The purpose of this research is to present a straightforward and relatively efficient method for solving scheduling problems. A new heuristic algorithm, with the objective of minimizing the makespan, is developed and presented in this paper for job shop scheduling problems (JSP). This method determines jobs’ orders for each machine. The assessment is based on the combination of dispatching rules e.g. the “Shortest Processing Time” of each operation, the “Earliest Due Date” of each job, the “Least Tardiness” of the operations in each sequence and the “First come First Serve” idea. Also, unlike most of the heuristic algorithms, due date for each job, prescribed by the user, is considered in finding the optimum schedule. A multitude of JSP problems with different features are scheduled based on this proposed algorithm. The models are also solved with Shifting Bottleneck algorithm, known as one of the most common and reliable heuristic methods. The result of comparison between the outcomes shows that when the number of jobs are less than or equal to the number of machines, the proposed algorithm concludes smaller, and better, makespan in a significantly lower computational time, which shows the superiority of the suggested algorithm. In addition, for a category when the number of jobs are greater than the number of machines, the suggested algorithm generates more efficient results when the ratio of the number of jobs to the number of machines is less than 2.1. However, in this category for the mentioned ratio to be higher than 2.1, the smaller makespan could be generated by either of the methods, and the results do not follow any particular trend, hence, no general conclusions can be made for this case.

关键词： Heuristic Algorithm Job Shop Scheduling Shifting Bottleneck Makespan