Search results

1 – 10 of 19
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 16 January 2017

Emad Abouel Nasr, Abdurahman Mushabab Al-Ahmari, Khaja Moiduddin, Mohammed Al Kindi and Ali K. Kamrani

The purpose of this paper is to demonstrate the route to digitize the customized mandible implants consisting of image acquisition, processing, implant design, fitting rehearsal…

490

Abstract

Purpose

The purpose of this paper is to demonstrate the route to digitize the customized mandible implants consisting of image acquisition, processing, implant design, fitting rehearsal and fabrication using fused deposition modeling and electron beam melting methodologies.

Design/methodology/approach

Recent advances in the field of rapid prototyping, reverse engineering, medical imaging and image processing have led to new heights in the medical applications of additive manufacturing (AM). AM has gained a lot of attention and interest during recent years because of its high potential in medical fields.

Findings

Produced mandible implants using casting, milling and machining are of standard sizes and shapes. As each person’s physique and anatomical bone structure are unique, these commercially produced standard implants are manually bent before surgery using trial and error methodology to custom fit the patient’s jaw. Any mismatch between the actual bone and the implant results in implant failure and psychological stress and pain to the patient.

Originality/value

The novelty in this paper is the construction of the customized mandibular implant from the computed tomography (CT) scan which includes surface reconstruction, implant design with validation and simulation of the mechanical behavior of the design implant using finite element analysis (FEA). There has been few research studies on the design and customization of the implants before surgery, but there had been hardly any study related to customized design implant and evaluating the biomechanical response on the newly designed implant using FEA. Though few studies are related to FEA on the reconstruction plates, but their paper lacks the implant design model and the reconstruction model. In this research study, an integrated framework is developed for the implant design, right from the CT scan of the patient including the softwares involved through out in the study and then performing the biomechanical study on the customized design implant to prove that the designed implant can withstand the biting and loading conditions. The proposed research methodology which includes the interactions between medical practitioners and the implant design engineers can be incorporated to any other reconstruction bone surgeries.

Details

Rapid Prototyping Journal, vol. 23 no. 1
Type: Research Article
ISSN: 1355-2546

Keywords

Access Restricted. View access options
Article
Publication date: 18 January 2011

Ali K. Kamrani and Maryam Azimi

Most of the current radiation treatment planning systems use pre‐treatment computed tomography (CT) images to detect the tumor location and then plan the radiation therapy to be…

637

Abstract

Purpose

Most of the current radiation treatment planning systems use pre‐treatment computed tomography (CT) images to detect the tumor location and then plan the radiation therapy to be delivered during the treatment period. It is assumed that the tumor geometry will not change throughout the treatment course; however, tumor geometry is shown to be changing over time. The purpose of this paper is to present results of an ongoing research in 3‐D modeling and reconstruction of head and neck cancer tumors. The results from this phase of the project will be used in developing a prediction model for tumor deformation during radiation treatment of cancer patients.

Design/methodology/approach

By using CT scan data in the 3‐D ASCII format, the tumor's progressive geometric changes during the treatment period are quantified. After constructing slice contours, both triangular and rectangular patch approaches are applied to map and analyze the tumor surface and volume. The changes in tumor location are calculated based on a reference feature on the top of the spine canal. MATLAB routines are developed to perform the required calculations. A set of prototype mockups of different stages are used for the purpose of validation and verification of the proposed methodology.

Findings

The proposed method is applied to calculate volume, surface, and displacement of the tumor, using patients’ data obtained from the University of Texas‐MD Anderson Cancer Center. The results are consistent with the actual data.

Originality/value

The proposed methodology increases the accuracy of treatment planning by predicting the changes in tumor geometry. The literature survey reveals that no work has been devoted to mathematically model the geometrical changes that a tumor might go through after each radiation.

Details

Rapid Prototyping Journal, vol. 17 no. 1
Type: Research Article
ISSN: 1355-2546

Keywords

Access Restricted. View access options
Article
Publication date: 1 June 1994

Chiu‐Chi Wei, Ali K. Kamrani and Henry Wiebe

Develops a graphic simulation system in conjunction with a kinematicerror model to assist management in making investment decisions. UsesTaguchi‐type experimental design to…

512

Abstract

Develops a graphic simulation system in conjunction with a kinematic error model to assist management in making investment decisions. Uses Taguchi‐type experimental design to predict the robot process capability. Two sets of charts are created by the system to represent the repeatability and accuracy of the robot performing a given operation. These charts are, first, histograms in the x, y, and z directions and, second, scattered ellipses in the xy, yz, and xz planes. Central to the system are three characteristics: a description of the geometric error and of the kinematic error; a common function to request and display a robot moving from one position to the next; and a family of charts showing the capability of the robot implementing a given task. The results provided by the system can help management to analyse robot projects concerning robot selection and implement action in a more systematic manner.

Details

Integrated Manufacturing Systems, vol. 5 no. 2
Type: Research Article
ISSN: 0957-6061

Keywords

Access Restricted. View access options
Article
Publication date: 1 March 2013

Avi Friedman, Aaron Sprecher and Basem Eid Mohamed

The concept of employing web-based configuration systems towards mass customization of housing has been implemented by some prefabricated housing companies around the globe, and…

44

Abstract

The concept of employing web-based configuration systems towards mass customization of housing has been implemented by some prefabricated housing companies around the globe, and has become a challenging research area in the last few decades as an outcome of advancements in communication and design technologies. Different methodologies have been employed with the aim of efficiently engaging future homebuyers in the design of their homes. The thrust of this paper is to systematically formalize an advanced configuration system for mass customization of prefabricated housing for a company operating in the Canadian market. The focus is on one floor bungalows which are common within the Province of Quebec. Such housing models targets a specific market sector; elderly couples seeking retirement homes, with the aim of improving affordability through maintaining particular design and production qualities.

Details

Open House International, vol. 38 no. 1
Type: Research Article
ISSN: 0168-2601

Keywords

Available. Content available
Article
Publication date: 23 October 2009

1192

Abstract

Details

Journal of Manufacturing Technology Management, vol. 20 no. 8
Type: Research Article
ISSN: 1741-038X

Available. Content available
Article
Publication date: 7 August 2007

197

Abstract

Details

Assembly Automation, vol. 27 no. 3
Type: Research Article
ISSN: 0144-5154

Access Restricted. View access options
Article
Publication date: 9 March 2012

Ali Kamrani, Hazem Smadi and Sa'Ed M. Salhieh

The purpose of this paper is to present the results on a model for manufacturing under the constraints and conditions of mass customization environment.

1002

Abstract

Purpose

The purpose of this paper is to present the results on a model for manufacturing under the constraints and conditions of mass customization environment.

Design/methodology/approach

The proposed model is based on manufacturing features and entails the concept of modular design. That is, manufacturing features are identified and analyzed in a way that enables the generation of what is called “manufacturing core”. Manufacturing cores are semi‐finished products that have certain manufacturing features. The core can be used to manufacture a range of products after conducting certain manufacturing processes. Manufacturing cores are generated through two phases of optimization. The first phase is known as product's manufacturing features analysis which includes starting features identification. The second phase is known as manufacturing cores formation that ends with generation of manufacturing cores.

Findings

The methodology is implemented on real products (flanges) as a case study. The proposed model for mass customization is compared at make‐to‐stock and make‐to‐order policies in terms of a burden which includes the time and the cost that are required to fulfil a production order. Applying the proposed model of mass customization entails the minimum total burden required.

Research limitations/implications

When the number of generic and variant features increases, an automated feature‐recognition module or sub‐system is required to facilitate the extraction of manufacturing features.

Practical implications

The proposed methodology is used for design of customized product through the application of integrated design for modularity and mass customization approach for production.

Originality/value

The proposed methodology entails development of semi‐finished products based on manufacturing features that can be used for design and manufacturing of a range of products.

Details

Journal of Manufacturing Technology Management, vol. 23 no. 3
Type: Research Article
ISSN: 1741-038X

Keywords

Access Restricted. View access options
Article
Publication date: 1 July 2006

Ali Kamrani and Abhay Vijayan

The primary objective of this paper is to illustrate the development of an integrated product development environment using template‐based methodology. This system would thus act…

1805

Abstract

Purpose

The primary objective of this paper is to illustrate the development of an integrated product development environment using template‐based methodology. This system would thus act as an effective tool to reduce cost by foreseeing manufacturability constraints during concept generation phase. Concurrent engineering approach is applied to product and process development and thus the different phases of manufacturing are integrated together. The developed template system is then used for the design of a prototype using an electric motor.

Design/methodology/approach

In this paper, implementation of an integrated design based on templates is presented. The developed system components such as design calculations, component search, machine selection, process template retrieval and cost estimation. These components are integrated to relational databases. These databases contain all information required for integrated product and process development. Concepts used in developing the system are independent of the software used.

Findings

By using templates, the time required for new product development is drastically reduced. At the same time incorporating computer‐aided process planning into the system gives the designer a better understanding of the cost implications of the modified design with respect to manufacturing. The major challenge in implementing of such system is that any changes in the manufacturing facility have to be incorporated in the process plans stored. This can be a tedious job but can be overcome by using hybrid process planning approach instead of variant based approach.

Research limitations/implications

The proposed template systems can be further developed to be considered as infrastructure necessary for design within a collaborative engineering environment. Further research and development is necessary for implementation. Though, the result from this case is promising.

Originality/value

The paper proposes the structure necessary for the implementation of a template‐based system. The approach used in the development of the integrated systems could be used by small and mid segment industries which do not have enough resources for costly software upgrading and complex computer technologies. By using templates, the time required for new product development is drastically reduced.

Details

Journal of Manufacturing Technology Management, vol. 17 no. 5
Type: Research Article
ISSN: 1741-038X

Keywords

Available. Content available
Article
Publication date: 1 January 2013

1376

Abstract

Details

Journal of Manufacturing Technology Management, vol. 24 no. 1
Type: Research Article
ISSN: 1741-038X

Access Restricted. View access options
Article
Publication date: 6 February 2023

Nofirman Firdaus, Hasnida Ab-Samat and Bambang Teguh Prasetyo

This paper reviews the literature on maintenance strategies for energy efficiency as a potential maintenance approach. The purpose of this paper is to identify the main concept…

627

Abstract

Purpose

This paper reviews the literature on maintenance strategies for energy efficiency as a potential maintenance approach. The purpose of this paper is to identify the main concept and common principle for each maintenance strategy for energy efficiency.

Design/methodology/approach

A literature review has been carried out on maintenance and energy efficiency. The paper systematically classified the literature into three maintenance strategies (e.g. inspection-based maintenance [IBM], time-based maintenance [TBM] and condition-based maintenance [CBM]). The concept and principle of each maintenance strategy are identified, compared and discussed.

Findings

Each maintenance strategy's main concept and principle are identified based on the following criteria: data required and collection, data analysis/modeling and decision-making. IBM relies on human senses and common senses to detect energy faults. Any detected energy losses are quantified to energy cost. A payback period analysis is commonly used to justify corrective actions. On the other hand, CBM monitors relevant parameters that indicate energy performance indicators (EnPIs). Data analysis or deterioration modeling is needed to identify energy degradation. For the diagnostics approach, the energy degradation is compared with the threshold to justify corrective maintenance. The prognostics approach estimates when energy degradation reaches its threshold; therefore, proper maintenance tasks can be planned. On the other hand, TBM uses historical data from energy monitoring. Data analysis or deterioration modeling is required to identify degradation. Further analysis is performed to find the optimal time to perform a maintenance task. The comparison between housekeeping, IBM and CBM is also discussed and presented.

Practical implications

The literature on the classification of maintenance strategies for energy efficiency has been limited. On the other hand, the ISO 50001 energy management systems standard shows the importance of maintenance for energy efficiency (MFEE). Therefore, to bridge the gap between research and industry, the proposed concept and principle of maintenance strategies will be helpful for practitioners to apply maintenance strategies as energy conservation measures in implementing ISO 50001 standard.

Originality/value

The novelty of this paper is in-depth discussion on the concept and principle of each maintenance strategy (e.g. housekeeping or IBM, TBM and CBM) for energy efficiency. The relevant literature for each maintenance strategy was also summarized. In addition, basic rules for maintenance strategy selection are also proposed.

Details

Journal of Quality in Maintenance Engineering, vol. 29 no. 3
Type: Research Article
ISSN: 1355-2511

Keywords

1 – 10 of 19
Per page
102050