S. NURMAYA MUSA | University of Malaya, Malaysia (original) (raw)

Papers by S. NURMAYA MUSA

A Predictive Integrated Genetic-Based Model for Supplier Evaluation and Selection

International Journal of Fuzzy Systems, May 31, 2017

Supplier evaluation and selection is a complicated multiple criteria decision-making process whic... more Supplier evaluation and selection is a complicated multiple criteria decision-making process which affects supply chain management (SCM) directly. Recent studies emphasize that artificial intelligence approaches obtain better performance than conventional methods in evaluating the suppliers’ performance and determining the best suppliers. Hence, this study proposes a new robust genetic-based intelligent approach, namely gene expression programming (GEP), to improve the supplier selection process for a supply chain and to cope with the drawback of the other intelligent approaches in this area. The applicability of this method was exhibited by a case study in the textile manufacturing industry. To show the performance of the mathematical-genetic model, comparisons with four intelligent techniques, namely multi-layer perceptron (MLP) neural network, radial basis function (RBF) neural network, adaptive neuro-fuzzy inference system (ANFIS) and support vector machine (SVM), were performed. The results derived from the intelligent approaches were compared by using a collected dataset from a textile factory. The obtained results demonstrated that first the GEP-based model provides a mathematical model for the suppliers’ performance based on the determined criteria, and the developed GEP model is more accurate than the four other intelligent models in terms of accuracy in performance estimation. In addition, to verify the validity of the developed model, different statistical tests were used and the results showed that the GEP model is statistically powerful.

Advances in Engineering Software, Dec 1, 2014

This paper addresses the economic lot scheduling problem where multiple items produced on a singl... more This paper addresses the economic lot scheduling problem where multiple items produced on a single facility in a cyclical pattern have shelf life restrictions. A mixed integer non-linear programming model is developed which allows each product to be produced more than once per cycle and backordered. However, production of each item more than one time may result in an infeasible schedule due to the overlapping production times of various items. To eliminate the production time conflicts and to achieve a feasible schedule, the production start time of some or all the items must be adjusted by either advancing or delaying. The objective is to find the optimal production rate, production frequency, cycle time, as well as a feasible manufacturing schedule for the family of items, in addition to minimizing the long-run average cost. Metaheuristic methods such as the genetic algorithm (GA), simulated annealing (SA), particle swarm optimization (PSO), and artificial bee colony (ABC) algorithms are adopted for the optimization procedures. Each of such methods is applied to a set of problem instances taken from literature and the performances are compared against other existing models in the literature. The computational performance and statistical optimization results shows the superiority of the proposed metaheuristic methods with respect to lower total costs compared with other reported procedures in the literature.

Selection of composite material based on compromise MCDM method

Nucleation and Atmospheric Aerosols, 2023

Optimisation of multi-plant capacitated lot-sizing problems in an integrated supply chain network using calibrated metaheuristic algorithms

International Journal of Operational Research, 2020

International Journal of Procurement Management, 2017

Recently shelf life during which the items remain safe within the production plants is considered... more Recently shelf life during which the items remain safe within the production plants is considered in production optimisation models. This paper addresses manufacturing system with multiple items produced on a single facility having shelf life restrictions and backorders. Backorders incur shelf life constraint alteration, affecting the corresponding inventory models. Accordingly, appropriate modifications are applied to the related mathematical models. The purpose is to determine the optimal cycle time and minimise the long-run average costs. While the cost-minimisation cycle time causes the spoilage of a product due to the shelf life restrictions, proper decisions are made based on one of the three options: production rate reduction, cycle time reduction, and a combination of both. For each option, optimal cycle time and production rate are estimated to satisfy shelf life constraint. Numerical examples are presented to illustrate the influence of production cost, backorders, and shelf life on total cost.

Journal of Fundamental and Applied Sciences, Jan 23, 2018

Selecting appropriate suppliers has directly effect on this network efficiency, costs, quality an... more Selecting appropriate suppliers has directly effect on this network efficiency, costs, quality and environmental performance. Hence, success. Supplier selection is a multi quantitative data. Thus, the aim of this paper is introducing an integrated model for green multiple sourcing in fuzzy environment. sub criteria to evaluate and rank best sup been used to find weight of each supplier. Then, a Fuzzy Technique of ranking Preferences by Similarity to the Ideal Solution (TOPSIS) method is developed to rank suppliers and select the appropriate ones. The proposed model helps managers to solve multiple reduce purchasing cost, lead time and improve quality and environmental issue.

Journal of The Mechanical Behavior of Biomedical Materials, Aug 1, 2016

PVD process as a thin film coating method is highly applicable for both metallic and ceramic mate... more PVD process as a thin film coating method is highly applicable for both metallic and ceramic materials, which is faced with the necessity of choosing the correct parameters to achieve optimal results. In the present study, a GEP-based model for the first time was proposed as a safe and accurate method to predict the adhesion strength and hardness of the Nb PVD coated aimed at growing the mixed oxide nanotubular arrays on Ti67. Here, the training and testing analysis were executed for both adhesion strength and hardness. The optimum parameter combination for the scratch adhesion strength and micro hardness was determined by the maximum mean S/N ratio, which was 350 W, 20 sccm, and a DC bias of 90 V. Results showed that the values calculated in the training and testing in GEP model were very close to the actual experiments designed by Taguchi. The as-sputtered Nb coating with highest adhesion strength and microhardness was electrochemically anodized at 20 V for 4 h. From the FESEM images and EDS results of the annealed sample, a thick layer of bone-like apatite was formed on the sample surface after soaking in SBF for 10 days, which can be connected to the development of a highly ordered nanotube arrays. This novel approach provides an outline for the future design of nanostructured coatings for a wide range of applications.

International Journal of Production Economics, Sep 1, 2012

Journal of Intelligent Manufacturing, Oct 2, 2014

In this study, the design of a two-echelon distribution supply chain network for the seasonal pro... more In this study, the design of a two-echelon distribution supply chain network for the seasonal products with multiple vendors (manufacturers) and buyers (retailers), and a set of warehouses for each vendor are considered. The locations of the buyers are known and the capacity of the warehouses is restricted while the buyers purchase different products from the vendors under all unit discount policy. The main objective of this research is to find out the optimal locations of the potential vendors in addition to the quantity ordered (allocation) by the buyers so that the total inventory cost including ordering (transportation), holding and the purchasing costs is minimized. Besides, the distance from the buyers to the vendors is considered as the Euclidean distance. The total budget to buy the products is limited and the production capacity of each vendor is also restricted. To solve the problem, a modified particle swarm optimization (MPSO) algorithm is applied where the results are validated using a genetic algorithm (GA). Finally, some computational examples are gen

International Journal of Production Economics, Sep 1, 2011

The purpose of this paper is to investigate the research development in supply chain risk managem... more The purpose of this paper is to investigate the research development in supply chain risk management (SCRM), which has shown an increasing global attention in recent years. Literature survey and citation/co-citation analysis are used to fulfil the research task. Literature survey has undertaken a thorough search of articles on selected journals relevant to supply chain operations management. Meanwhile, citation/co-citation analysis uses Web of Sciences database to disclose SCRM development between 1995 and 2009. Both approaches show similar trends of rising publications over the past 15 years. This review has piloted us to identify and classify potential risk associated with different flows, namely material, cash and information flows. Consequently, we identify some research gaps. Even though there is a pressing need and awareness of SCRM from industrial aspect, quantitative models in the field is relatively lacking and information flow risk has received less attention. It is also interesting to observe the evolutions and advancements of SCRM discipline. One finding is that the intellectual structure of the field made statistically significant increase during 2000-2005 and evolved from passively reacting to vague general issues of disruptions towards more proactively managing supply chain risk from system perspectives.

Capacity Expansion Policy and Its Risk in New Product Diffusion

It is difficult to know how much one should invest in expanding capacity when a new product is in... more It is difficult to know how much one should invest in expanding capacity when a new product is introduced to market, because there is often a lack of data for sales history. Based on the Bass diffu ...

Interfacial microstructure and strength of brazed copper/porous copper foam towards the effect of porous copper foam pore density and brazing holding time

Materialwissenschaft Und Werkstofftechnik, Jun 1, 2021

The porous copper foam was sandwiched between two coppers plate and then brazed using copper‐tin ... more The porous copper foam was sandwiched between two coppers plate and then brazed using copper‐tin (9.7 %)‐nickel (5.7 %)‐phosphorus (7 %) filler foil. Brazing process was conducted to joint copper/porous copper foam by evaluating the effect of porous copper foam pore densities [pore per inch (PPI)] and brazing holding times. The brazed joint interface of copper and porous copper foam was characterised using Field emission scanning electron microscopy and Energy‐dispersive x‐ray spectroscopy for the microstructure and elemental composition analysis, respectively. X‐ray diffraction analysis was carried out on the shear fractured surfaces of brazed copper and porous copper foam for phase determination. The results exhibited distinct phases of copper (Cu), copper phosphide (Cu3P), nickel phosphide (Ni3P), and copper compound with tin (6 : 5) (Cu6Sn5). The filler layer was formed as an island‐shaped that consists of copper phosphide and nickel phosphide. Prolong brazing holding time causes a thinner filler layer in brazing seam. While the non‐uniform thickness of the filler layer was observed at different pore densities of porous copper foam. The shear strength of brazed copper/porous copper foam 15 PPI with a 10 min brazing holding time yield a maximum shear strength of 2.9 MPa.

Sustainability, Feb 11, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Supply chains have expanded rapidly over the decades, with the aim to increase productivity, lowe... more Supply chains have expanded rapidly over the decades, with the aim to increase productivity, lower costs and fulfil demands in emerging markets. The increasing complexity in a supply chain hinders visibility and consequently reduces one's control over the process. Cases of disruption such as the ones faced by Ericsson and Enron, have shown that a risk event occurring at one point of the supply chain can greatly affect other members, when the disruption is not properly controlled. Supply chain management thus faces a pressing need to maintain the expected yields of the system in risk situations. To achieve that, we need to both identify potential risks and evaluate their impacts, and at the same time design risk mitigation policies to locate and relocate resources to deal with risk events.

Journal of Cleaner Production, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Polymers

The aim of this research was to study the possibility of using silver nanoflakes (SNFs) as an ant... more The aim of this research was to study the possibility of using silver nanoflakes (SNFs) as an antibacterial agent in polysulfone (PSF) membranes. SNFs at different concentrations (0.1, 0.2, 0.3 and 0.4 wt.%) were added to a PSF membrane dope solution. To investigate the effect of SNFs on membrane performance and properties, the water contact angle, protein separation, average pore size and molecular weight cutoffs were measured, and water flux and antibacterial tests were conducted. The antimicrobial activities of the SNFs were investigated using Escherichia coli taken from river water. The results showed that PSF membranes blended with 0.1 wt.% SNFs have contact angles of 55°, which is less than that of the pristine PSF membrane (81°), exhibiting the highest pure water flux. Molecular weight cutoff values of the blended membranes indicated that the presence of SNFs does not lead to enlargement of the membrane pore size. The rejection of protein (egg albumin) was improved with the a...

Augmented reality assisted facility layout digitization and planning

Journal of Mechanical Science and Technology

Operations and Supply Chain Management: An International Journal

The container terminal is considered as a supply chain station where freight containers are trans... more The container terminal is considered as a supply chain station where freight containers are transferred from the sea into the hinterland or vice versa. Port terminal operators have to brighten up their strategies for increasing port performance to compete with other rival marine ports. Technological advances in port operation have created a wide variety of study options for port designers, but little attention has been paid to the fully examine factor influence in port performance from both technical operation and management perspectives simultaneously. The paper aims to substantially review factors that influenced container terminal performances. The authors report a systematic literature review conducted using the method of Preferred Reporting Items for Systematic reviews and Meta-Analyses. 106 published articles have been gathered from Web of Sciences journal databases. The findings of the review classify the domain of the studies into eight main themes such as assignment, scheduling, optimization, strategic management, risk, performance evaluation, information system, and maintenance. The literature review also identified trends of those main themes. Furthermore, the studies found the highest performance cluster of container terminals focused on operation, facility, and equipment. In conclusion, operation time, container handling time, and quay crane productivity have been identified as the primary elements that influenced container terminal performance.

Challenges to promoting eco-industry parks in Malaysia: A case study of Rawang Integrated Industrial Park

Journal of Material Cycles and Waste Management, 2021

Malaysia is a developing country, and its economic growth has caused the increase in the generati... more Malaysia is a developing country, and its economic growth has caused the increase in the generation of industrial waste in terms of its volume. The increase has its impacts towards the environment. Thus, it is imperative for the stakeholders to address the waste disposal issues in general. Currently, majority practice the end-of-pipe approach, that promotes the use of landfill disposal method. As this is not an eco-friendly solution, strategy such as recyclable material recovery is explored. This paper presents an overview of the current non-hazardous industrial solid waste management and typical challenges faced for developing eco-industrial park (EIP). In this paper, we select Rawang Integrated Industrial Park, Malaysia as our study model. A total of 29 companies in this park, which are comprised of small, medium and large industries, agreed to participate in this study. The questionnaires were distributed via email, followed by telephone calls and face-to-face interviews to increase the response rate. Results shown that 66% of the companies did not have designated personnel in solid waste management because it was not a major concern so long the waste was collected and disposed by the waste collection contractor. The common types of non-hazardous wastes generated were food wastes, waste papers, plastic wastes, glass and metals. Furthermore, none of the respondents knew where their wastes were disposed. Finally, the case study of Rawang Integrated Industrial Park suggests four typical challenges for developing eco-industrial parks in Malaysia. They were namely, low quantity of recyclable generated by industry, lack of top management commitment, absence of synergies between industries and lack of enforcement.

Container Movement Evaluation Using System Dynamics Simulation

2020 IEEE International Conference on Industrial Engineering and Engineering Management (IEEM), 2020

The paper evaluates the effect of container handling rules to the smoothness of container movemen... more The paper evaluates the effect of container handling rules to the smoothness of container movement. The movement includes box transfer from into vessel, movement in stacking yard and discharging box in-out the port. High amount container stacked in stacking yard indicates problem in container flow. The goals of this research was to find out the variable that affected balance of container moves, then analyze rules of transfer process and set out the option of reference in order to reduce idle time and excessive stock of containers in stacking yard. The value of this study is to extract factors for reducing idle time and unbalance of container quantity in the chain of transfer area which effect on the port performance through system dynamics simulation. Result discovered reasonable rules could develop for enhancing continuity of container moves are effective arrangement in handling equipment and information sharing among stakeholders.