Search results
1 – 10 of 270Osama Moselhi, Sabah Alkass and Mohamed Al‐Hussein
This paper provides an overview of a recently developed system for selecting and locating mobile cranes on construction sites. The proposed system provides direct help on two…
Abstract
This paper provides an overview of a recently developed system for selecting and locating mobile cranes on construction sites. The proposed system provides direct help on two fronts: cost and time savings, and improved safety arrangements. The system has a number of interesting features: a relational database designed to store the cranes' geometry‐related variables and to present them using powerful graphics; a selection module supported by an algorithm designed to satisfy geometrical requirements and necessary clearances, accounting for site constraints and lift configurations; and 3D animation to facilitate the planning of crane operations. The system provides a near‐optimum selection of crane lift configurations, considering available cranes. This paper focuses mainly on case examples to demonstrate and to illustrate the use and capabilities of the developed system. Two actual cases, featuring different site constraints and lift configurations, are presented. In these cases, cranes were selected and their operations planned using the developed system. The findings of the two cases are discussed and the benefits of the proposed methodology are highlighted.
Details
Keywords
Pip Cornelius, Nick Higgett and Rehan Kaleem
This paper aims to describe the development of a multimedia 3D animation based resource for speech sound training.
Abstract
Purpose
This paper aims to describe the development of a multimedia 3D animation based resource for speech sound training.
Design/methodology/approach
Speech sound training is historically auditory in nature and speech sound disorders often prove intractable. Sensory articulation speech system (SASSy) combines auditory and visual stimuli as a novel multimedia resource to enhance learning.
Findings
The advantages of the visual presentation of information have been described by the authors of various studies using instrumental analysis of speech as a training resource. With the further integration of a speech analysis and biofeedback mechanism, SASSy is designed to be used as a non‐invasive diagnostic and therapeutic tool.
Practical implications
Intended users are speech and language therapy clients with motor speech sound disorders (MSDs). At any one time, up to 20 per cent of the population – adults and children – have a speech disorder arising from a difficulty in producing perceptually acceptable speech sounds. Therapy is very time and resource intensive and the consultative role that speech and language therapists are now assuming means they have less capacity to deliver and assess traditional articulation therapy. Training and feedback can only be on a 1:1 basis and relies on the therapist providing an explanation and description of the speech mechanism to facilitate correct speech.
Originality/value
MSDs often prove resistant to change which is frustrating for clients and therapists alike. It is anticipated that a new, non‐intrusive instrumental analytic and therapeutic tool will improve the treatment and management of motor speech disorders. Animations of speech sounds were derived from the instrumental analysis of real speech to provide a real‐time visual sequence for users to match.
Details
Keywords
Vijay K. Bansal and Mahesh Pal
The applications of geographic information systems (GIS) are described in the civil engineering literature for generation, visualisation and evaluation of the construction…
Abstract
Purpose
The applications of geographic information systems (GIS) are described in the civil engineering literature for generation, visualisation and evaluation of the construction schedule. GIS use is also explored for construction quantity takeoffs and cost estimation. The purpose of this paper is to supplement the already explored capabilities of GIS in construction by providing the methodology for direct sunlight visualisation on buildings.
Design/methodology/approach
The proposed methodology for direct sunlight visualisation is to calculate the solar angles and use them for spatial distribution representation of the amount of sunlight received on different faces of a building by rendering it with the colour of varied gradients. The colour gradient on any face of a building depends upon the amount of direct sunlight received. The solar gain is demonstrated through the multi‐dimensional data visualisation like sun angle variations with diurnal and annual cycles in a navigable 3D animation.
Findings
GIS‐based methodology provides the planner a way to control the natural lighting and solar gain on a building which can be combined with the project schedule, quantity takeoffs, cost estimate and 4D visualisation in a single environment. Beginning with this idea, the planner may store and share information about a construction project, site and surrounding geography.
Originality/value
Most of the existing 4D CAD technologies do not have project management capabilities and are used mainly for the planning and design stage of a construction project. In comparison, GIS‐based tools may be used in different stages. These are more management‐based and allow more collaborative and cooperative relationships between designer, constructor and client. By using a GIS‐based approach, construction documents like schedules, drawings, quantity takeoffs, cost estimates, project specifications and direct sunlight visualisations are more consistent with each other.
Details
Keywords
The number of 3D models available on the internet to both students and educators is rapidly expanding. Not only are the 3D model collections of popular websites like…
Abstract
Purpose
The number of 3D models available on the internet to both students and educators is rapidly expanding. Not only are the 3D model collections of popular websites like Thingiverse.com growing, organizations such as the Smithsonian Institution and NASA have also recently begun to build collections of 3D models and make these openly accessible online. Yet, even with increased interest in 3D printing and 3D scanning technologies, little is known about the overall structure of the 3D models available on the internet. The paper aims to discuss this issue.
Design/methodology/approach
To initiate this project, a list was built of 33 of the most widely used 3D model websites on the internet. Freely downloadable models, as well as models available for purchase or as 3D printed objects were included in the list. Once the list of 33 websites was created, the data for each individual 3D model in the collections was manually assembled and recorded. The titles of the 3D models, keywords, subject headings, license information, and number of views and downloads were recorded, as this information was available. The data were gathered between January and May 2015, and compiled into a CSV database. To determine how online 3D model content relates to a variety of educational disciplines, relevant subject terms for a variety of educational disciples were extracted from the EBSCO database system. With this list of subject terms in hand, the keywords in the CSV database of model information were searched for each of the subject terms, with an automated process using a Perl script.
Findings
There have been many teachers, professors, librarians and students who have purchased 3D printers with little or no 3D modelling skills. Without these skills the owners of these 3D printers are entirely reliant on the content created and freely shared by others to make use of their 3D printers. As the data collected for this research paper shows, the vast majority of open 3D model content available online pertains to the professions already well versed in 3D modelling and Computer Aided Design design, such as engineering and architecture.
Originality/value
Despite that fact that librarians, teachers and other educators are increasingly using technologies that rely on open 3D model content as educational tools, no research has yet been done to assess the number of 3D models available online and what educational disciplines this content relates to. This paper attempts to fill this gap, providing an overview of the size of this content, the educational disciplines this content relates to and who has so far been responsible for developing this content. This information will be valuable to librarians and teachers currently working with technology such as 3D printers and virtual reality, as well as those considering investing in this technology.
Details
Keywords
In order to present a significant usage of the computer-aided design (CAD)/computer-aided manufacturing (CAM) systems in the apparel and textile industry, the current literature…
Abstract
Purpose
In order to present a significant usage of the computer-aided design (CAD)/computer-aided manufacturing (CAM) systems in the apparel and textile industry, the current literature has been observed. Although the CAD/CAM systems have also been increasingly applied to all fields apparel and textile manufacturing for the last few decades, improving the precision, productivity and the organization of the information flow, they have not been fully utilized in these industrial fields. The paper aims to discuss these issues.
Design/methodology/approach
The paper is structured in three main sections showing the vast applicability of the CAD/CAM systems, the benefits provided by them and the future trend in their development.
Findings
Although the initial development of the CAD/CAM systems strived to completely eliminate manual and time-consuming operations, they have not been accepted in practice due to their inflexibility at making changes and the time needed for regenerating a complex parametric model. The textile and apparel industries show slow progress in acquiring the CAD/CAM systems.
Originality/value
This CAD/CAM technology enabled the customization in the design process according to individual needs and directed the textile and the apparel industry to moving into new directions such as the mass customization to personalization. The paper makes clear that although this technological concept is rather old, the use of the CAD/CAM systems will inevitably broaden in terms of applicability to new production stages.
Details
Keywords
C.H.M. Hardaker and G.J.W. Fozzard
States that there has been considerable interest in recent years over the development of a computer system to provide the garment designer with a 3D design environment. Although…
Abstract
States that there has been considerable interest in recent years over the development of a computer system to provide the garment designer with a 3D design environment. Although the use of such technology is commonplace in many industries, the problems associated with the development of a suitable system for garment design have yet to be fully resolved. Envisages that such a system would provide the tools to develop a 3D simulation of a prototype garment which can be viewed from any angle prior to making a physical sample. This combined with the facility to develop the corresponding 2D pattern shapes and evaluate the fit of the virtual garment make the prospect of such a system extremely enticing. Considers the need for 3D working methods in garment design and the research issues involved in the development of a 3D computer aided design (CAD) system for garment design. The potential features of such a system are introduced in the context of a hypothetical system. Discusses the approach of a number of researchers in the field and considers future developments.
Details
Keywords
Vacharapoom Benjaoran and Sdhabhon Bhokha
The 4D CAD model has been accepted for better conceptualizing and comprehending the sequences and spatial constraints in a construction schedule. The purpose of this paper is to…
Abstract
Purpose
The 4D CAD model has been accepted for better conceptualizing and comprehending the sequences and spatial constraints in a construction schedule. The purpose of this paper is to identify the deficiencies of the visualization of the 4D CAD model and to propose improvements.
Design/methodology/approach
The presentation abilities of the existing 4D CAD model are analyzed and compared with the other conventional methods, namely Gantt chart, network diagram, and the calendar. Four aspects of the visualization are addressed, namely the overview of a schedule, the duration of an activity, the relationship of an activity, and the project progress tracking. The proposed improvements employed different visual properties of 3D CAD objects such as color, line weight, and line type to represent the different activities' performing statuses. A prototype of the 4D CAD model with enhanced visualization was developed on a construction project case.
Findings
The model evaluation showed that this development could enhance the visualization of the 4D CAD model and provide a more informative construction schedule.
Original/value
It is anticipated that the 4D CAD model with these enhancements can substitute for conventional presentation methods of construction schedules.
Details
Keywords
Sisi Zlatanova, Laure Itard, Mahmud Shahrear Kibria and Machiel van Dorst
Urban renewal is a multifaceted activity that involves numerous actors, software, and types of data. Design communication tools play an important role in this process. Visual…
Abstract
Urban renewal is a multifaceted activity that involves numerous actors, software, and types of data. Design communication tools play an important role in this process. Visual information helps to outline, understand, and choose sustainable solutions for problems in the design, while visual tools should be able to diminish professional differences and establish a common language. Recent 3D geo-technologies offer a great variety of new tools that significantly enrich visualisation possibilities and allow for flexible switching between different 3D representations. However, studies have indicated that particular representations create different perceptions in professional compared to non-professional individuals. This paper discusses the specifics of urban renewal processes in the Netherlands and investigates recently developed 3D geo-information technology, and more specifically multiple 3D representations, that can support this task. The concept of LOD, which uses five levels of information, was evaluated as a very promising approach to agree on abstractions and representations in the different renewal phases. The study did not reveal a lack of digital possibilities for visualisation, but instead showed that the simultaneous visualisation of the proposed alternatives should be a priority. This investigation did reveal that different levels of interactivity could be used for the presentation and communication of project alternatives.
Details
Keywords
Zhijia Dong, Gaoming Jiang, Guoming Huang and Honglian Cong
The virtual display of 3D garment is one of the most important features in a computer-aided garment design system. The purpose of this paper is to present a novel web-based 3D…
Abstract
Purpose
The virtual display of 3D garment is one of the most important features in a computer-aided garment design system. The purpose of this paper is to present a novel web-based 3D virtual display framework for the online design of warp-knitted seamless garment using the latest WebGL and HTML5 technologies.
Design/methodology/approach
Based on the feature-based parametric 3D human body model, the 3D model of skin-tight warp-knitted seamless garment is established using the geometric modeling method. By applying plane parameterization technology, the 3D garment model is then projected into corresponding 2D prototype pattern and a texture-mapping relationship is obtained. Finally, an online 3D virtual display application framework for warp-knitted seamless garment is implemented on modern WebGL-enabled web browsers using the latest WebGL and HTML5 technologies, which allow garment designers to globally access without installing any additional software or plugin.
Findings
Based on the 2D/3D model of warp-knitted seamless garment, an online 3D virtual display application running on modern WebGL-enabled web browser is implemented using the latest Javascript, WebGL and HTML5 technologies, which is proven to be an effective way for building the web-based 3D garment CAD systems.
Originality/value
This paper provides a parametric design method for warp-knitted seamless garment 2D/3D model, and web-based online virtual display of 3D warp-knitted seamless garment is implemented for the first time, which establishes the foundation for the web-based online computer-aided warp-knitted seamless garment design system.
Details
Keywords
Victor Kuzmichev, Aleksei Moskvin, Evgenii Surzhenko and Mariia Moskvina
Designing of clothes using the historical prototypes is very popular in contemporary practice. The purpose of this paper is to apply 2D and 3D computer-aided design (CAD) systems…
Abstract
Purpose
Designing of clothes using the historical prototypes is very popular in contemporary practice. The purpose of this paper is to apply 2D and 3D computer-aided design (CAD) systems to reconstruct the historical pattern block and get the virtual image in accordance with the prototypes. New algorithm has been proved for men trousers taken from the nineteenth century.
Design/methodology/approach
Our approach is to develop a method of CAD to reconstruct historical trousers through analyzing and rebuilding of historical algorithms used to pattern blocks making, old anthropometrical database, and the pattern blocks shaping. Trousers construction, methods of trousers shaping by hands, body sizes schedule, manuals of 36 pattern cutting systems, and its sketches from nineteenth century have been analyzed. Then, by means of parameterization of historical pattern blocks, we have developed the universal trousers pattern cutting algorithm. The final step of the research has been devoted to virtual fitting technology that helps to determine the differences between historical trousers chosen as prototype and virtual image reconstructed by 3D CAD.
Findings
The authors have developed the parametrical module of 2D CAD and expanded the application of 3D CAD to re-designing of completely new object such as nineteenth century trousers pattern blocks in accordance with the historical method of shaping by hands. The conformity between the style of historical trousers and the virtual images reconstructed from two resources – pattern block and sketch silhouette – has been achieved.
Originality/value
This study demonstrated the contemporary approach to historical garments reconstruction by means of CAD. This study should help researchers of historical costume and practical specialists in apparel industry to apply historical heritage in a contemporary way.
Details