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Scheduling Optimization Modelling:A Case Study of a Woven Label Manufacturing Company

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Computer Systems Science & Engineering 2021年第8期38卷 239-249页

作者： Chia-Nan Wang Zhao-Hong Cheng nguyen ky phuc phan Van Thanh nguyen Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778TaiwanChina Department of International Business National Kaohsiung University of Science and TechnologyKaohsiung80778TaiwanChina Faculty of Industrial Engineering and Management International UniversityHo Chi Minh City70000Vietnam Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

Production scheduling involves all activities of building production schedules,including coordinating and assigning activities to each person,group of people,or machine and arranging work orders in each *** scheduling must solve all problems such as minimizing customer wait time,storage costs,and production time;and effectively using the enterprise’s human *** paper studies the application of flexible job shop modelling on scheduling a woven labelling *** labelling process includes several steps which are handled in different *** workstation is also comprised of several identical parallel *** this study,job splitting is allowed so that the power of work stations can be utilized *** final objective is to minimize the total completion time of all *** results show a significant improvement since the new planning may save more than 60%of lead time compared to the current *** contribution of this research is to propose a flexible job shop model for scheduling a woven labelling *** proposed approach can also be applied to support complex production scheduling processes under fuzzy environments in different industries.A practical case study demonstrates the effectiveness of the proposed model.

关键词： Flexible job shop scheduling Woven labelling Garment industry Optimization Production scheduling

Heuristic Scheduling of Job Orders in a Build-to-Order Manufacturing System

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Computer Systems Science & Engineering 2022年第3期40卷 1059-1072页

作者： Chia-Nan Wang Chien-Chang Chou Yu-Chi Chung nguyen ky phuc phan VanThanh nguyen Viet Tinh nguyen Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Shipping Technology National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Industrial Engineering and Management International UniversityHo Chi Minh City70000Vietnam Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

With the continuous development of technology,traditional manual work has been becoming more and more *** large or medium-sized companies have applied Enterprise Resource Planning(ERP)software into their business and production ***,since many small firms cannot afford ERP because of its expensive cost,they often still employ manual work for the same tasks this software resolves,especially for *** paper aims to provide a possible solution for small businesses to try automated scheduling and discover whether it can help *** are two main ways to make this determination:a mathematical model and a heuristic model,which are suitable for assessing low-and medium-sized workloads,*** case study was carried out in a small domestic interior furniture company,particularly in scheduling for their customized products in two-stage flow ***,they produce according to the sequence of customers’***,when we applied these supportive tools with batch-processing machines,they experienced enhanced production performance due to diminishing setup time for distinctive items and a more streamlined arrangement of job *** changes were implemented for some small companies that do not use many production stages and have a suitable number of jobs and *** this method were applied to larger demands,it would need further improvement and development to become a complete tool that can perform like a part of an ERP system.

关键词： scheduling mathematical heuristic flow shop batch-processing

Stochastic Programming For Order Allocation And Production Planning

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Computer Systems Science & Engineering 2022年第1期40卷 75-85页

作者： phan nguyen ky phuc International University-Vietnam National University Vietnam National UniversityHoChiMinh City70000Vietnam

Stochastic demand is an important factor that heavily affects production *** influences activities such as purchasing,manufacturing,and selling,and quick adaption is *** production planning,for reasons such as reducing costs and obtaining supplier discounts,many decisions must be made in the initial stage when demand has not been *** effects of non-optimal decisions will propagate to later stages,which can lead to losses due to overstocks or *** find the optimal solutions for the initial and later stage regarding demand realization,this study proposes a stochastic two-stage linear program-ming model for a multi-supplier,multi-material,and multi-product purchasing and production planning *** objective function is the expected total cost after two stages,and the results include detailed plans for purchasing and production in each demand ***-scale problems are solved through a deterministic equivalent transformation *** solve the problems in the large scale,an algorithm combining metaheuristic and sample average approximation is *** algorithm can be implemented in parallel to utilize the power of the *** algorithm based on the observation that if the remaining quantity of materials and number of units of products at the end of the initial stage are given,then the problems of the first and second stages can be decomposed.

关键词： Mixed integer programming two-stage stochastic programming production planning order allocation

A Truck Scheduling Problem for Multi-Crossdocking System with Metaheuristics

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Computers, Materials & Continua 2022年第9期72卷 5165-5178页

作者： phan nguyen ky phuc nguyen Van Thanh Duong Bao Tram International University-Vietnam National University Vietnam National UniversityHoChiMinh City70000Vietnam Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

The cross-docking is a very important subject in logistics and supply chain *** to the definition,cross-docking is a process dealing with transhipping inventory,in which goods and products are unloaded from an inbound truck and process through a flow-center to be directly loaded onto an outbound ***-docking is favored due to its advantages in reducing the material handing cost,the needs to store the product in warehouse,as well decreasing the labor cost by eliminating packaging,storing,pick-location and order *** cross-docking,products can be consolidated and transported as a full load,reducing overall distribution *** this paper,we focus on a truck scheduling at the multidoor,multi-crossdocking network with inventory constraints and process capability *** this model,a truck can visit severals docks for loading or unloading many types *** situation is very common in *** study also developed an exact mathematical model using mixedinteger linear programming(MILP)with the objective of minimizing the makespan to obtaint the benchmark in small scale *** scale problems are solved through Simulated Annealing(SA)algorithm and Tabu Search(TS)*** of these algorithms will be compared to benchmarks obtained from solver as well as to each other.

关键词： Truck scheduling multi-door multi-crossdocking network simulated annealing tabu search

Optimization Model in Manufacturing Scheduling for the Garment Industry

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Computers, Materials & Continua 2022年第6期71卷 5875-5889页

作者： Chia-Nan Wang Yu-Chen Wei Po-Yuk So Viet Tinh nguyen phan nguyen ky phuc Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Money and Banking National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Ph.D.Program in Finance and Banking National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Commerce Van Lang UniversityHo Chi Minh CityVietnam Faculty of Industrial Engineering and Management International UniversityHo Chi Minh City70000Vietnam

The garment industry in Vietnam is one of the country’s strongest industries in the ***,the production process still encounters problems regarding scheduling that does not equate to an optimal *** paper introduces a production scheduling solution that resolves the potential delays and lateness that hinders the production process using integer programming and order allocation with a make-to-order manufacturing viewpoint.A number of constraints were considered in the model and is applied to a real case study of a factory in order to viewhowthe tardiness and latenesswould be affected which resulted in optimizing the scheduling time ***,the constraints considered were order assignments,production time,and tardiness with an objective function which is to minimize the total cost of *** results of the study precisely the overall cost of delay of the orders given to the plant and successfully propose a suitable production schedule that utilizes the most of the plant *** study has shown promising results that would assist plant and production managers in determining an algorithm that they can apply for their production process.

关键词： Production scheduling problem order allocation integer programming make-to-order manufacturing apparel industry

Face Mask Recognition for Covid-19 Prevention

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Computers, Materials & Continua 2022年第11期73卷 3251-3262页

作者： Trong Hieu Luu phan nguyen ky phuc Zhiqiu Yu Duy Dung Pham Huu Trong Cao College of Engineering Can Tho UniversityCan Tho city910900Viet Nam International University-Vietnam National University Vietnam National UniversityHoChiMinh City70000Vietnam Department of Industrial Management National Taiwan University of Science and TechnologyTaipei10607Taiwan

In recent years,the COVID-19 pandemic has negatively impacted all aspects of social *** to ease in the infected method,i.e.,through small liquid particles from the mouth or the nose when people cough,sneeze,speak,sing,or breathe,the virus can quickly spread and create severe problems for people’s *** to some research as well as World Health Organization(WHO)recommendation,one of the most economical and effective methods to prevent the spread of the pandemic is to ask people to wear the face mask in the public space.A face mask will help prevent the droplet and aerosol from person to person to reduce the risk of virus *** simple method can reduce up to 95%of the spread of the ***,this solution depends heavily on social consciousness,which is sometimes *** order to improve the effectiveness of wearing face masks in public spaces,this research proposes an approach for detecting and warning a person who does not wear or misuse the face *** approach uses the deep learning technique that relies on GoogleNet,AlexNet,and VGG16 *** results are synthesized by an ensemble method,i.e.,the bagging *** the experimental results,the approach represents a more than 95%accuracy of face mask recognition.

关键词： Face mask detection deep learning AlexNet GoogLeNet VGG16 ensemble method

System Dynamics Forecasting on Taiwan Power Supply Chain

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Computer Systems Science & Engineering 2022年第6期41卷 1191-1205页

作者： Zhiqiu Yu Shuo-Yan Chou phan nguyen ky phuc Tiffany Hui-Kuang Yu Department of Industrial Management National Taiwan University of Science and TechnologyTaipei10607Taiwan Industrial Engineering and Management Department International UniversityHo Chi Minh City70000Vietnam Department of Public Finance Feng Chia UniversityTaichungTaiwan

This research aims to study the sustainability of Taiwan power supplychain based on system dynamics forecasting. The paper tries to investigate electricity shortage effects not only on the industrial side, but also from the standpointof society. In our model, different forecasting methods such as linear regression,time series analysis, and gray forecasting are also considered to predict the parameters. Further tests such as the structure, dimension, historical fit, and sensitivityof the model are also conducted in this paper. Through analysis forecasting result,we believe that the demand for electricity in Taiwan will continue to increase to acertain level for a period of time in the future. This phenomenon is closely relatedto Taiwan’s economic development, especially industrial development. We alsopoint out that electricity prices in Taiwan do not match with high industrialdemand, and that prices are still slightly low. Finally, the future growth trend ofTaiwan’s electricity demand has not changed, and ensuring adequate supply tomeet electricity demand to prevent potential power shortages will pose somedifficulty.

关键词： System dynamics taiwan power supply chain electricity demand

Patterns of hepatitis B virus exposure and associated predictors in Vietnam: A crosssectional study

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Asian Pacific Journal of Tropical Medicine 2020年第12期13卷 535-541页

作者： Minh C.Duong phuc V.D.Le Oanh N.K.Pham Hien D.T.Pham Toan B.nguyen Hai T.phan School of Public Health and Community Medicine University of New South WalesSydneyNew South WalesAustralia MEDIC Medical Center Ho Chi Minh CityVietnam Hospital for Tropical Diseases Ho Chi Minh CityVietnam Pham Ngoc Thach University of Medicine Ho Chi Minh CityVietnam

Objective:To examine the magnitude of isolated anti-HBc and other HBV serological patterns and associated predictors among adults seeking general health check-up at a large health center in ***:All 564 outpatients seeking general health checkup between January 2016 and December 2016 were asked to undertake HBV surface antigen,surface antibody,IgG and IgM core antibody(anti-HBc total),platelet counts,and liver function *** administered questionnaire was used to collect information regarding demography,in-house sources of infection,lifestyle,health condition and treatment,and HBV ***:Male gender(P=0.043),age(P=0.000),living in urban areas(P=0.040),HBV vaccination status(P=0.033),and ALT(P=0.040) were associated with isolated *** infection was associated with HBV vaccination status(P=0.001),ALT levels(P=0.010),AST levels(P=0.020),and platelet counts(P=0.007).Past/resolved HBV infection was associated with AST levels(P=0.005),ALT levels(P=0.014),and age(P=0.000).Conclusions:Isolated anti-HBc is quite *** of isolated anti-HBc include male gender,living in rural areas,and HBV *** prevalence of isolated anti-HBc also increases with *** timely detect occult HBV infection and prevent transmission,anti-HBc testing should be included in the health check-up for high risk individuals and screening program where HBV nucleic acid test is not *** prevent transmission,clinicians need to pay more attention on those who are at risk of having isolated anti-HBc and closely follow-up patients with isolated anti-HBc and educate them about the prevention of HBV infection.

关键词： prevention seeking Vietnam

Inferences on the Difference of Two Proportions: A Bayesian Approach

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Open Journal of Statistics 2017年第1期7卷 1-15页

作者： Thu Pham-Gia nguyen Van Thin phan phuc Doan Department of Mathematics and Statistics Université de Moncton New Brunswick Canada Faculty of Mathematics and Computer Science Hochiminh University of Science Ho Chi Minh Vietnam

Let π=π1-π2 be the difference of two independent proportions related to two populations. We study the test H0:π≥0 against different alternatives, in the Bayesian context. The various Bayesian approaches use standard beta distributions, and are simple to derive and compute. But the more general test H0:π≥η, with η>0, requires more advanced mathematical tools to carry out the computations. These tools, which include the density of the difference of two general beta variables, are presented in the article, with numerical examples for illustrations to facilitate comprehension of results.

关键词： Proportion Convolution Normal Beta Bayesian Critical Value Appell’s Function