Advances in Manufacturing and Materials Engineering

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Authors: M.N.B.A. Nazri, M. Haque, A.N. Mustafizul Karim, Fatima B. Muhamad
Abstract: Bread is considered as a prime item of cereal intake globally. Due to the rising public health concerns and their dietary needs, importance of identifying the factors in bread making, and taking necessary action plans can hardly be overemphasized. Moreover, to be competitive in business it is crucial for any bread maker to address the manufacturing factors or attributes to reduce the rejection level due to poor quality. This study makes an attempt to identify those attributes and rank them through application of analytic hierarchy process (AHP). The questionnaire is prepared to judge the ranking of initially identified five prime attributes such as ingredient quality, processing time and procedure, environment and workers’ skill. The responses by the manager, supervisor, line leader and quality control inspector on pair-wise comparison scale are collected and analyzed by using Expert Choice software along with the verification of inconsistency value. According to the results, quality of ingredient is ranked first followed by the processing time of the bread, production procedure, worker’s skill, and production environment. Since the inconsistency level is found to be below the threshold value, policies can be adopted safely in accordance with the ranking of factors to uphold the quality of bread and reduce the rejection level.
Authors: Irfan Hilmy, Erry Yulian T. Adesta, Nur’atiyah Najwa binti Samsul Bahrim, Aini Nurrasyidah binti Azhar, Siti Fatimah binti Mohd Shahar
Abstract: In developing any engineering product, it is crucial to develop product architecture of the system. An engineering team who responsible in developing different module should work together in order to obtain product architecture as a blueprint of the project. It is common to breakdown system or product into smaller elements as follows: subsystems, modules and component and define the interactions between components and subsystems. In order to achieve the performance of the system as a whole, these elements must be integrated to work together. One of the method to develop product architecture is Design Structure Matrix (DSM). The use of DSM for Development of Product architecture with case study a CNC router platform is presented. Using DSM, order of product development can be optimized and any form of wastes can be eliminated in the design stage.
Authors: H.M.E. Kays, A.N. Mustafizul Karim, M.N.B. Tajudin, M. Abdesselam
Abstract: A production flow line balancing problem for automotive industry has been studied. A batch of an end item is produced by transforming sheet metals into parts at different manufacturing stages followed by assembly operations. The forming operations of the sheet metals into various parts and their assembly works are illustrated through 22 different tasks. Some of the tasks have the processing times greater than the takt time and are categorized as extra-long tasks. Attempts were made to solve this intricate line balancing problem by adopting the Ranked Positional Weight (RPW) method. But the solution given by the RPW model loses its exactitude due to the presence of the extra-long tasks. In this research a heuristic approach based on RPW is developed through which the problem has been resolved in an efficient and effective manner and hence the proposed heuristic is deemed to be capable of balancing production lines having such extra-long tasks.
Authors: M. Abdesselam, A.N. Mustafizul Karim, H.M. Emrul Kays, Mohamed Abdul Rahman, R.A. Sarker
Abstract: In order to survive in a competitive environment, industries are required to adopt strategies that ensure their abilities to provide their customers with a product featured by good quality, low cost and short delivery time. Short term scheduling plays a pivotal role in this context by ensuring the operations to be executed and monitored in an optimal or sub-optimal manner which guarantees the product shipping within the customers’ due dates at lower cost and/or higher utilization of resources. However, the dynamic nature of the shop floor environment causes the predictive schedules to be no longer optimal or even feasible. Frequent disruptions occurring during the execution of the predictive schedule require the operations managers to be reactive to make appropriate decision considering the new situation. Adequate research works based on integer programming are available in literature to cope with static scheduling problems, but there is a dearth in integer programming based approaches for dynamic or reactive situations. The aim of this work is to formulate a model that solves the reactive flow-shop scheduling problem subject to arrival of new orders. Objective function for makespan minimization and the comprehensive equations for predictive and reactive schedules are presented with the necessary elaboration.
Authors: Azmi Hassan, Chairul Saleh, Baba Md Deros, Mohd Nizam Ab Rahman, Raden Achmad Chairdino Leuveano, Andra Adiyoga
Abstract: This paper presents product marketing and inventory policy for a manufacturer and multi-retailer system under vendor managed inventory (VMI) mode of operation. The aim is to maximize individual profit where each firm interacted through decentralised supply chain. For this reason, the manufacturer often considers managing the system-wide inventories by determining replenishment cycles, backorder quantity, wholesale price, and advertising investment. Also, due to the information-asymmetric VMI, retailers sequentially need to determine their optimal retail prices and advertisement policies. In order to find the optimal solution i.e. better profit equilibrium for all supply chain channel, a Genetic Algorithm is proposed in this study. The proposed algorithm is assessed for its solution quality. Furthermore, the performance evaluations are given, to present an improvement to the model.
Authors: Wan Yusoff, Emad El-Kashif
Abstract: Nowadays, a lot of technologies have been developed in order to design and construct the product easily and economically. Rapid Prototyping (RP) technology is one of the most utilized technologies when it comes to creating the prototype parts. The purpose of this project is to implement the rapid prototyping technology as a great value tool in supporting medical activities with consideration fabrication cost of biomodel. The RP technique applied to fabricate the biomodel is FDM and the material used is Acrylonitrile Butadiene Styrene (ABS). The models produced by using RP bring the significant in educational and pre-medical surgical environments. The fabricated biomodels are useful to simplify the complex surgical procedures and the visualization of anatomical structures in educational environment.

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