Randula L. Hettiarachchi, Pisut Koomsap and Panarpa Ardneam
An inherent problem on risk priority number (RPN) value duplication of traditional failure modes and effect analysis (FMEA) also exists in two customer-oriented FMEAs. One has no…
Abstract
Purpose
An inherent problem on risk priority number (RPN) value duplication of traditional failure modes and effect analysis (FMEA) also exists in two customer-oriented FMEAs. One has no unique value, and another has 1% unique values out of 4,000 possible values. The RPN value duplication has motivated the development of a new customer-oriented FMEA presented in this paper to achieve practically all 4,000 unique values and delivering reliable prioritization.
Design/methodology/approach
The drastic improvement is the result of power-law and VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR). By having all three risk factors in a power-law form, all unique values can be obtained, and by applying VIKOR to these power-law terms, the prioritization is more practical and reliable.
Findings
The proposed VIKOR power law-based customer-oriented FMEA can achieve practically all 4,000 unique values and is tested with two case studies. The results are more logical than the results from the other two customer-oriented FMEAs.
Research limitations/implications
The evaluation has been done on two case studies for the service sector. Therefore, additional case studies in other industrial sectors will be required to confirm the effectiveness of this new customer-oriented RPN calculation.
Originality/value
Achieving all 1,000 unique values could only be done by having experts tabulate all possible combinations for the traditional FMEA. Therefore, achieving all 4,000 unique values will be much more challenging. A customer-oriented FMEA has been developed to achieve practically all 4,000 unique risk priority numbers, and that the prioritization is more practical and reliable. Furthermore, it has a connection to the traditional FMEA, which helps explain the traditional one from a broader perspective.
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Faisal Rasool, Pisut Koomsap, Bilal Afsar and Babrak Ali Panezai
Disruptive innovations have the potential to fundamentally change how businesses operate. This study aims to propose a five-step framework to help firms develop disruptive…
Abstract
Purpose
Disruptive innovations have the potential to fundamentally change how businesses operate. This study aims to propose a five-step framework to help firms develop disruptive innovations and to offer a scale for evaluating their disruptive potential. This scale can also be applied to identify the disruptive potential of innovations introduced to the market by competitors.
Design/methodology/approach
The framework was designed on the basis of criteria chosen to identify the disruptive potential of innovations at early stages of development based on a theoretical understanding of disruptive innovation, its challenges and holistic consideration of innovation as a dynamic process. It consists of steps that could serve as a reference model during the process of developing innovations with disruptive potential. A case study is discussed in detail to demonstrate the applicability of the framework.
Findings
A simple yet comprehensive assessment framework for disruptive innovation has been developed, which can help develop innovations with disruptive potential in existing settings of incumbent firm. A case study of the Wii demonstrates that Nintendo could have planned its disruptive product using the proposed framework.
Originality/value
Most research works in this area have focused on difficulties experienced by firms facing disruption and failed to highlight its opportunities; this study argues that firms can intentionally create disruptive innovations. The results of this study offer firms a tool that facilitates a proactive approach, helping develop new disruptive innovations and identify those from competitors.
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Panitcha Peganant and Pisut Koomsap
The purpose of this paper is to present a new tile dispensing decision-making to improve a row formation of a product flow-based tiling automation that has been being developed to…
Abstract
Purpose
The purpose of this paper is to present a new tile dispensing decision-making to improve a row formation of a product flow-based tiling automation that has been being developed to support tile placement for custom mosaic design.
Design/methodology/approach
A new tile dispensing decision-making combines maximum tile loading and simple cycle strategies to minimize time for forming rows of tiles. The maximum tile loading strategy is for minimizing the number of loading rounds, while the simple cycle strategy is for minimizing the movement during the row formation.
Findings
This proposed decision-making has been developed; implemented in LabVIEW software; linked with other LabVIEW-based programs to control the system; and tested. The results showed the tile dispensing with the proposed decision-making performed better than the previous one.
Research limitations/implications
The tiling automation is being developed and is currently on a prototyping stage.
Originality/value
Tile dispensing is critical for this row by row automated assembly, but the existing shortest distance strategy does not guarantee the best performance for a row formation. Therefore, the combination of the maximum tile loading and simple cycle strategies has been developed to improve the performance of the product flow-based tiling automation to better support assembly of custom mosaic design that requires individual tesserae to be assembled to particular positions to illustrate an image properly.
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Thittikorn Phattanaphibul, Pisut Koomsap, Irwansyah Idram and Suchart Nachaisit
This paper aims to introduce selective vacuum manufacturing (SVM), a powder-based rapid prototyping (RP) technique, and the ongoing development to improve its capability to apply…
Abstract
Purpose
This paper aims to introduce selective vacuum manufacturing (SVM), a powder-based rapid prototyping (RP) technique, and the ongoing development to improve its capability to apply in temporary scaffold fabrication.
Design/methodology/approach
SVM employs a combination of sand casting and powder sintering process to construct a prototype layer by layer. A dense layer of support material is prepared and selectively removed to create a cavity where part material is filled and sintered to form a solid layer. In order for SVM to be considered for scaffold fabrication, besides preparing poly-lactic acid (PLA) for part material, support material preparation and process parameters identification have been studied. Redesigning of SVM machine to be more suitable for the real usage has also been presented.
Findings
Particle size of salt has been controlled, and its suitable composition with flour and water has been determined. Process parameters have been identified to scale down the size of scaffolds to meso-scale and to achieve mechanical requirement. Properties of fabricated scaffolds have been enhanced and can be used for soft tissue applications. A prototype of the medical SVM machine has been constructed and tested. An examination of scaffolds fabricated on this new machine also showed their qualification for soft tissue application.
Research limitations/implications
Further study will be on conducting a direct cytotoxicity test to provide the evidence for tissue growth before the clinical usage, on continuing to scaling down the scaffold size, and on improving SVM to meet the requirement of hard tissue.
Originality/value
This simple, inexpensive RP technique demonstrates its viability for scaffold fabrication.
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Apinya Chanthakulchan, Pisut Koomsap, Kampanat Auyson and Pitt Supaphol
– This paper aims to present the development of an electrospinning-based rapid prototyping (ESRP) technique for the fabrication of patterned scaffolds from fine fiber.
Abstract
Purpose
This paper aims to present the development of an electrospinning-based rapid prototyping (ESRP) technique for the fabrication of patterned scaffolds from fine fiber.
Design/methodology/approach
This ESRP technique unifies rapid prototyping (RP) and electrospinning to obtain the ability of RP to create a controllable pattern and of electrospinning to create a continuous fine fiber. The technique follows RP process of fused deposition modeling, but instead of using extrusion process for fiber creation, electrospinning is applied to generate a continuous fiber from a liquid solution. A machine prototype has been constructed and used in the experiments to evaluate the technique.
Findings
Three different lay-down patterns: 0°/90°, 45°/135° and 45° twists were used in the experiments. According to the experimental results, stacks of patterned layers could be created with the ESRP technique, and the fabrication process was repeatable and reproducible. However, the existing machine vibration influenced the fiber size and the ability to control straightness and gap size. Also, incomplete solidification of the fibers prior to being deposited obstructed the control of layer thickness. Improvement on vibration suppression and fiber solidification will strengthen the capability of this ESRP technique.
Research limitations/implications
This research is currently limited to the introduction of the ESRP technique, to the development of the machine prototype, to the demonstration of its capability and to the evaluation of the structural properties of the fabricated patterned scaffolds. Further studies are required for better control of the patterned scaffolds and for investigation of mechanical and biological properties.
Originality/value
This unification of the two processes allows not only the fabrication of controllable patterned scaffolds but also the fabrication of both woven and non-woven layers of fibers to be done on one machine.