MOHD KHAIROL ANUAR BIN MOHD ARIFFIN / ENG (original) (raw)
Papers by MOHD KHAIROL ANUAR BIN MOHD ARIFFIN / ENG
The International Journal of Advanced Manufacturing Technology, 2015
The paper presents an algorithm for integrated scheduling, dispatching, and conflict-free routing... more The paper presents an algorithm for integrated scheduling, dispatching, and conflict-free routing of jobs and AGVs in FMS environment using a hybrid genetic algorithm. The algorithm generates an integrated schedule and detail routing paths while optimizing makespan, AGV travel time, and penalty cost due to jobs tardiness and delay as a result of conflict avoidance. The multi-objective fitness function use adaptive weight approach to assign weights to each objective for every generation based on objective improvement performance. Fuzzy expert system is used to control genetic operators using the overall population performance improvements of the last two previous generations. Computational experiments was conducted on the developed algorithm coded in Matlab to test the effectiveness of the algorithm. Integrated scheduling of jobs in FMS which are in synchrony with AGV dispatching, scheduling, and routing proved to ensure the feasibility and effectiveness of all the solutions of the integrated constituent elements.
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original documen and are linked to publications on ResearchGate, letting you access and read them immediately.
In modern railway technology exploitation, rails are exposed to a constant increase of speed and ... more In modern railway technology exploitation, rails are exposed to a constant increase of speed and loading on the vehicle axles and to constant stress increase in welded railway tracks. To meet the increased exploitation requirements, new requirements for rail steel quality in manufacturing process and inspection methods in manufacturing and service process have been pursued. In the first part of this review, probable defect in different stages such as melting, rolling, HT, drilling, cutting, installing, termite welding and exploiting are classified and their suitable non-destructive testing (NDTs) is described. In the second part of this review, the ability and sufficiency of different NDT methods for detecting a certain defect are explained. Advantages and disadvantages of Phased Array and EMAT are compared. New approaches in structural health monitoring (SHM) for rail inspecting and monitoring are investigated. In this paper a review has been conducted to bridging conventional and ...
Problem-based learning (PBL) approaches to engineering education often generate justifiable enthu... more Problem-based learning (PBL) approaches to engineering education often generate justifiable enthusiasm among faculty who has become frustrated with the limitations of traditional lecture-based education. However, faculty contemplating a change to a problem-based format rarely anticipates the many practical difficulties that can destroy one's enthusiasm and create chaos in the classroom. This paper describes in detail the implementation of PBL, a teaching method that incorporates realistic experiences in the classroom. This implementation technique has been used for two semesters in an undergraduate Chemical Engineering class in the Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia.
CITATIONS 0 READS 50 4 authors, including: Some of the authors of this publication are also worki... more CITATIONS 0 READS 50 4 authors, including: Some of the authors of this publication are also working on these related projects: Solid and Liquid Waste Mngt, Air resources Engg and Environmental conservation View project
Construction and Building Materials
This study presents an investigation into the durability of geopolymer concrete prepared using bl... more This study presents an investigation into the durability of geopolymer concrete prepared using blended ash of pulverized fuel ash (PFA) and palm oil fuel ash (POFA) along with alkaline activators when exposed to 2% solution of sulfuric acid for up to 18 months. Ordinary Portland Cement (OPC) concrete was also prepared as control concrete. The main parameters studied were the evaluation of mass, compressive strength, products of degradation and microstructural changes. The deterioration was examined using X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetry (TGA/DTG), scanning electron microscopy (SEM). The results of geopolymer and OPC concretes were compared and discussed. The performance of geopolymer concrete when exposed to 2% sulfuric acid solution for more than a year was superior to OPC concrete which is attributed to a more stable cross-linked aluminosilicate polymer structure formed in the geopolymer concrete.
The study presents an algorithm for conflict-free Automated Guided Vehicle (AGV) routing minimizi... more The study presents an algorithm for conflict-free Automated Guided Vehicle (AGV) routing minimizing travel time and total job tardiness. The problem is represented using one sub-chromosome for dispatching represented with random keys and the remaining sub-chromosomes for routing represented with priority-based encoding. The algorithm used weight mapping crossover (WMX) and Insertion Mutation (IM) for priority-based representation and parameterized uniform crossover (PUX) for random-key based representation. Conflict is detected and avoided using the route occupation time of each segment. Numerical experiment was conducted on the developed algorithm.
Applied Mechanics and Materials, 2015
2009 International Conference on Computers & Industrial Engineering, 2009
Containers have been used in past decades increasingly as one of the most important transportatio... more Containers have been used in past decades increasingly as one of the most important transportation tools. Containers have revolutionized cargo shipping and thus changed the world trade systematically. Container terminals as the transhipment facility playa valuable role in performance of this transportation system. Improvement of this facility has been widely considered in literatures. Automated container terminals (ACTs) have been introduced to pursue this purpose. In ACTs various transport vehicles are automated and integrated to each other. Automated guided vehicles (AGVs) are used in ACTs to handle containers between quay cranes and storage yards. Usually scheduling of the AGVs is known as the key factor to improve the performance of ACTs. This paper proposed a heuristic algorithm to schedule the AGVs concurrently with quay cranes. A genetic algorithm is proposed to optimize the simultaneous scheduling of AGVsand QCs. The results showed that proposed genetic algorithm can be used in practical implications while its running time is reasonably low.
2012 IEEE International Conference on Condition Monitoring and Diagnosis, 2012
Cable joint is used to connect different sections of cable because a cable section is limited to ... more Cable joint is used to connect different sections of cable because a cable section is limited to a certain length. The design of a cable joint mainly depends on the cable type, the applied voltage and the cores. These factors contribute to the way of how electric field stress is distributed at the cable joint. If there are defects exist within the cable joint insulation material, the electric field at that region is altered. The alteration may cause electrical discharges to occur within the defects if the electric field magnitude is larger than the breakdown strength at the defect sites. Therefore, this paper investigates the electric field distribution in a medium voltage cable joint in the presence of defects. The investigation was done through modelling a medium voltage (MV) cable joint using finite element analysis (FEA) software. Several parameters such as the defect size and location, insulation material dielectric constant and insulation thickness have been studied of their effects on the electric field distribution at the cable joint. The results obtained may be able to help in the designing of cable joint structures which can reduce the electric field stress.
American Journal of Engineering and Applied Sciences, 2008
Demand for lighter and stiffer products has been increasing in the last few years especially in a... more Demand for lighter and stiffer products has been increasing in the last few years especially in automobile manufacturing. The closed die forging process of Metal Matrix Material (MMC) is presented as possible solution, since it produces parts with good mechanical properties ...
IOP Conference Series: Materials Science and Engineering, 2014
ABSTRACT In previous decades, manufacturers faced a lot of challenges because of globalization an... more ABSTRACT In previous decades, manufacturers faced a lot of challenges because of globalization and high competition in markets. These problems arise from shortening product life cycle, rapid variation in demand of products, and also rapid changes in manufcaturing technologies. Nowadays most manufacturing companies expend considerable attention for improving flexibility and responsiveness in order to overcome these kinds of problems and also meet customer's needs. By considering the trend toward the shorter product life cycle, the manufacturing environment is towards manufacturing a wide variety of parts in small batches [1]. One of the major techniques which are applied for improving manufacturing competitiveness is Cellular Manufacturing System (CMS). CMS is type of manufacturing system which tries to combine flexibility of job shop and also productivity of flow shop. In addition, Dynamic cellular manufacturing system which considers different time periods for the manufacturing system becomes an important topic and attracts a lot of attention to itself. Therefore, this paper made attempt to have a brief review on this issue and focused on all published paper on this subject. Although, this topic gains a lot of attention to itself during these years, none of previous researchers focused on reviewing the literature of that which can be helpful and useful for other researchers who intend to do the research on this topic. Therefore, this paper is the first study which has focused and reviewed the literature of dynamic cellular manufacturing system.
2012 IEEE International Conference on Condition Monitoring and Diagnosis, 2012
Since insulation plays a significant role in ensuring the reliability of an polymeric underground... more Since insulation plays a significant role in ensuring the reliability of an polymeric underground cable, many researchers across the globe are very much interested to investigate the mechanisms responsible for insulation degradation when it is subjected to high electrical stresses. One of the ways to monitor the processes leading to breakdown is by observing a phenomenon known as electroluminescence (EL) within the insulating material. This paper presents the work performed for EL monitoring in various types of dielectric materials. The measurements results obtained from previous work will be compared and discussed thoroughly in order understand better the mechanisms responsible for the occurrence in EL in dielectrics. In addition, simulation studies will also be performed based on theoretical hypotheses and the results will be compared with experimental observation. By comparing the simulation results and experimental measurements, observation of EL as a pre-breakdown phenomenon can be validated.
American Journal of Engineering and Applied Sciences, 2010
Applied Mechanics and Materials, 2014
ABSTRACT Uncertainty is a condition that needs to be dealt with by Supply Chain Management (SCM) ... more ABSTRACT Uncertainty is a condition that needs to be dealt with by Supply Chain Management (SCM) in many organization. The factors that contributed to the uncertainty have to be understood in order to manage it in the best and practical ways. Uncertainty in an Oil & Gas firm propagates through the supply chain network including vessel sourcing activities that involved offshore transportation and installation activities. It is important to have a sustainable and reliable vessel supply in supporting offshore activities. Therefore, this paper presents the analysis of uncertainty in supply chain management process of vessels in the Oil & Gas Industry. This research is conducted by analysing quantitative data from vessel sourcing database focuses on uncertainty recorded from January to August 2012. It has been found that, the major causes of uncertainty is due to the unavailability of vessel with 51% of causes of uncertainty recorded. This is due to the increment of vessel utilization from year 2011 to 2012. However the uncertainty can be appropriately managed by implementing product departmentalization instead of customer departmentalization which is currently practiced by the firm under study. It can be concluded that, there are four factors that contributed to uncertainty which are vessels availability, project management plan, project requirement, and vendor reliability.
Transactions of the Indian Institute of Metals, 2014
An experiment was conducted to characterize microstructural and mechanical behavior of AA6061 all... more An experiment was conducted to characterize microstructural and mechanical behavior of AA6061 alloy during an artificial aging treatment through destructive and ultrasonic nondestructive techniques. Identical aluminum plates of AA6061-T6 aluminum alloy were solutionized at &800 K, followed by quenching and artificial aging at 493 K up to 8 h. The microstructural evolution was analyzed using scanning electron microscopy. The variations in hardness, yield stress, and ultimate tensile strength with respect to aging time were discussed. Besides, ultrasonic parameters velocity and attenuation were measured and correlated with the microstructural evolution as well as certain mechanical properties. The ultrasonic measurements showed a good correlation with the microstructural features and mechanical properties of the alloy during aging, whereby an excellent correlation was found between the longitudinal wave velocity and strength properties of the aged specimens. The longitudinal wave velocity was found to be directly related to the hardness with a correlation coefficient of 0.99.
The International Journal of Advanced Manufacturing Technology, 2015
The paper presents an algorithm for integrated scheduling, dispatching, and conflict-free routing... more The paper presents an algorithm for integrated scheduling, dispatching, and conflict-free routing of jobs and AGVs in FMS environment using a hybrid genetic algorithm. The algorithm generates an integrated schedule and detail routing paths while optimizing makespan, AGV travel time, and penalty cost due to jobs tardiness and delay as a result of conflict avoidance. The multi-objective fitness function use adaptive weight approach to assign weights to each objective for every generation based on objective improvement performance. Fuzzy expert system is used to control genetic operators using the overall population performance improvements of the last two previous generations. Computational experiments was conducted on the developed algorithm coded in Matlab to test the effectiveness of the algorithm. Integrated scheduling of jobs in FMS which are in synchrony with AGV dispatching, scheduling, and routing proved to ensure the feasibility and effectiveness of all the solutions of the integrated constituent elements.
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original documen and are linked to publications on ResearchGate, letting you access and read them immediately.
In modern railway technology exploitation, rails are exposed to a constant increase of speed and ... more In modern railway technology exploitation, rails are exposed to a constant increase of speed and loading on the vehicle axles and to constant stress increase in welded railway tracks. To meet the increased exploitation requirements, new requirements for rail steel quality in manufacturing process and inspection methods in manufacturing and service process have been pursued. In the first part of this review, probable defect in different stages such as melting, rolling, HT, drilling, cutting, installing, termite welding and exploiting are classified and their suitable non-destructive testing (NDTs) is described. In the second part of this review, the ability and sufficiency of different NDT methods for detecting a certain defect are explained. Advantages and disadvantages of Phased Array and EMAT are compared. New approaches in structural health monitoring (SHM) for rail inspecting and monitoring are investigated. In this paper a review has been conducted to bridging conventional and ...
Problem-based learning (PBL) approaches to engineering education often generate justifiable enthu... more Problem-based learning (PBL) approaches to engineering education often generate justifiable enthusiasm among faculty who has become frustrated with the limitations of traditional lecture-based education. However, faculty contemplating a change to a problem-based format rarely anticipates the many practical difficulties that can destroy one's enthusiasm and create chaos in the classroom. This paper describes in detail the implementation of PBL, a teaching method that incorporates realistic experiences in the classroom. This implementation technique has been used for two semesters in an undergraduate Chemical Engineering class in the Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia.
CITATIONS 0 READS 50 4 authors, including: Some of the authors of this publication are also worki... more CITATIONS 0 READS 50 4 authors, including: Some of the authors of this publication are also working on these related projects: Solid and Liquid Waste Mngt, Air resources Engg and Environmental conservation View project
Construction and Building Materials
This study presents an investigation into the durability of geopolymer concrete prepared using bl... more This study presents an investigation into the durability of geopolymer concrete prepared using blended ash of pulverized fuel ash (PFA) and palm oil fuel ash (POFA) along with alkaline activators when exposed to 2% solution of sulfuric acid for up to 18 months. Ordinary Portland Cement (OPC) concrete was also prepared as control concrete. The main parameters studied were the evaluation of mass, compressive strength, products of degradation and microstructural changes. The deterioration was examined using X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetry (TGA/DTG), scanning electron microscopy (SEM). The results of geopolymer and OPC concretes were compared and discussed. The performance of geopolymer concrete when exposed to 2% sulfuric acid solution for more than a year was superior to OPC concrete which is attributed to a more stable cross-linked aluminosilicate polymer structure formed in the geopolymer concrete.
The study presents an algorithm for conflict-free Automated Guided Vehicle (AGV) routing minimizi... more The study presents an algorithm for conflict-free Automated Guided Vehicle (AGV) routing minimizing travel time and total job tardiness. The problem is represented using one sub-chromosome for dispatching represented with random keys and the remaining sub-chromosomes for routing represented with priority-based encoding. The algorithm used weight mapping crossover (WMX) and Insertion Mutation (IM) for priority-based representation and parameterized uniform crossover (PUX) for random-key based representation. Conflict is detected and avoided using the route occupation time of each segment. Numerical experiment was conducted on the developed algorithm.
Applied Mechanics and Materials, 2015
2009 International Conference on Computers & Industrial Engineering, 2009
Containers have been used in past decades increasingly as one of the most important transportatio... more Containers have been used in past decades increasingly as one of the most important transportation tools. Containers have revolutionized cargo shipping and thus changed the world trade systematically. Container terminals as the transhipment facility playa valuable role in performance of this transportation system. Improvement of this facility has been widely considered in literatures. Automated container terminals (ACTs) have been introduced to pursue this purpose. In ACTs various transport vehicles are automated and integrated to each other. Automated guided vehicles (AGVs) are used in ACTs to handle containers between quay cranes and storage yards. Usually scheduling of the AGVs is known as the key factor to improve the performance of ACTs. This paper proposed a heuristic algorithm to schedule the AGVs concurrently with quay cranes. A genetic algorithm is proposed to optimize the simultaneous scheduling of AGVsand QCs. The results showed that proposed genetic algorithm can be used in practical implications while its running time is reasonably low.
2012 IEEE International Conference on Condition Monitoring and Diagnosis, 2012
Cable joint is used to connect different sections of cable because a cable section is limited to ... more Cable joint is used to connect different sections of cable because a cable section is limited to a certain length. The design of a cable joint mainly depends on the cable type, the applied voltage and the cores. These factors contribute to the way of how electric field stress is distributed at the cable joint. If there are defects exist within the cable joint insulation material, the electric field at that region is altered. The alteration may cause electrical discharges to occur within the defects if the electric field magnitude is larger than the breakdown strength at the defect sites. Therefore, this paper investigates the electric field distribution in a medium voltage cable joint in the presence of defects. The investigation was done through modelling a medium voltage (MV) cable joint using finite element analysis (FEA) software. Several parameters such as the defect size and location, insulation material dielectric constant and insulation thickness have been studied of their effects on the electric field distribution at the cable joint. The results obtained may be able to help in the designing of cable joint structures which can reduce the electric field stress.
American Journal of Engineering and Applied Sciences, 2008
Demand for lighter and stiffer products has been increasing in the last few years especially in a... more Demand for lighter and stiffer products has been increasing in the last few years especially in automobile manufacturing. The closed die forging process of Metal Matrix Material (MMC) is presented as possible solution, since it produces parts with good mechanical properties ...
IOP Conference Series: Materials Science and Engineering, 2014
ABSTRACT In previous decades, manufacturers faced a lot of challenges because of globalization an... more ABSTRACT In previous decades, manufacturers faced a lot of challenges because of globalization and high competition in markets. These problems arise from shortening product life cycle, rapid variation in demand of products, and also rapid changes in manufcaturing technologies. Nowadays most manufacturing companies expend considerable attention for improving flexibility and responsiveness in order to overcome these kinds of problems and also meet customer's needs. By considering the trend toward the shorter product life cycle, the manufacturing environment is towards manufacturing a wide variety of parts in small batches [1]. One of the major techniques which are applied for improving manufacturing competitiveness is Cellular Manufacturing System (CMS). CMS is type of manufacturing system which tries to combine flexibility of job shop and also productivity of flow shop. In addition, Dynamic cellular manufacturing system which considers different time periods for the manufacturing system becomes an important topic and attracts a lot of attention to itself. Therefore, this paper made attempt to have a brief review on this issue and focused on all published paper on this subject. Although, this topic gains a lot of attention to itself during these years, none of previous researchers focused on reviewing the literature of that which can be helpful and useful for other researchers who intend to do the research on this topic. Therefore, this paper is the first study which has focused and reviewed the literature of dynamic cellular manufacturing system.
2012 IEEE International Conference on Condition Monitoring and Diagnosis, 2012
Since insulation plays a significant role in ensuring the reliability of an polymeric underground... more Since insulation plays a significant role in ensuring the reliability of an polymeric underground cable, many researchers across the globe are very much interested to investigate the mechanisms responsible for insulation degradation when it is subjected to high electrical stresses. One of the ways to monitor the processes leading to breakdown is by observing a phenomenon known as electroluminescence (EL) within the insulating material. This paper presents the work performed for EL monitoring in various types of dielectric materials. The measurements results obtained from previous work will be compared and discussed thoroughly in order understand better the mechanisms responsible for the occurrence in EL in dielectrics. In addition, simulation studies will also be performed based on theoretical hypotheses and the results will be compared with experimental observation. By comparing the simulation results and experimental measurements, observation of EL as a pre-breakdown phenomenon can be validated.
American Journal of Engineering and Applied Sciences, 2010
Applied Mechanics and Materials, 2014
ABSTRACT Uncertainty is a condition that needs to be dealt with by Supply Chain Management (SCM) ... more ABSTRACT Uncertainty is a condition that needs to be dealt with by Supply Chain Management (SCM) in many organization. The factors that contributed to the uncertainty have to be understood in order to manage it in the best and practical ways. Uncertainty in an Oil & Gas firm propagates through the supply chain network including vessel sourcing activities that involved offshore transportation and installation activities. It is important to have a sustainable and reliable vessel supply in supporting offshore activities. Therefore, this paper presents the analysis of uncertainty in supply chain management process of vessels in the Oil & Gas Industry. This research is conducted by analysing quantitative data from vessel sourcing database focuses on uncertainty recorded from January to August 2012. It has been found that, the major causes of uncertainty is due to the unavailability of vessel with 51% of causes of uncertainty recorded. This is due to the increment of vessel utilization from year 2011 to 2012. However the uncertainty can be appropriately managed by implementing product departmentalization instead of customer departmentalization which is currently practiced by the firm under study. It can be concluded that, there are four factors that contributed to uncertainty which are vessels availability, project management plan, project requirement, and vendor reliability.
Transactions of the Indian Institute of Metals, 2014
An experiment was conducted to characterize microstructural and mechanical behavior of AA6061 all... more An experiment was conducted to characterize microstructural and mechanical behavior of AA6061 alloy during an artificial aging treatment through destructive and ultrasonic nondestructive techniques. Identical aluminum plates of AA6061-T6 aluminum alloy were solutionized at &800 K, followed by quenching and artificial aging at 493 K up to 8 h. The microstructural evolution was analyzed using scanning electron microscopy. The variations in hardness, yield stress, and ultimate tensile strength with respect to aging time were discussed. Besides, ultrasonic parameters velocity and attenuation were measured and correlated with the microstructural evolution as well as certain mechanical properties. The ultrasonic measurements showed a good correlation with the microstructural features and mechanical properties of the alloy during aging, whereby an excellent correlation was found between the longitudinal wave velocity and strength properties of the aged specimens. The longitudinal wave velocity was found to be directly related to the hardness with a correlation coefficient of 0.99.