International Journal of Advanced Manufacturing Technology. Mar2011, Vol. 53 Issue 1-4, p255-265. 11p.
CLOUD computing, RAPID prototyping, REVERSE engineering, DATA structures, DATA extraction, LEAST squares, ALGORITHMS, and CASE studies
Direct slicing of point cloud is an effective way to integrate reverse engineering and rapid prototyping. However, since the input of the direct slicing process is discrete point data, connections between the points are absent. The lack of global structure may make the process fail to handle complex shapes that have multicontoured slices. Furthermore, it may cause accuracy loss at some important features, e.g., at topology transitions. In order to overcome the above limitations, this paper presents a method to extract topological structure from the point cloud and applies the structure into a moving-least square (MLS) surface-based direct slicing process. In addition to the topology extraction, two modifications are made to improve the efficiency and stability of the process: (1) a variation of the traditional projection-based MLS surface is adopted; (2) a rectification algorithm is presented in 2D contour generation to avoid biased curves when abrupt curvature changes happen. The improved direct slicing method is tested by some case studies including synthetic and scanned data. The efficacy of the algorithm is demonstrated by the results. [ABSTRACT FROM AUTHOR]
NEW product development, PROTOTYPES, ENGINEERING design, CASE studies, and WINDOW blinds
This paper presents a case study of the design development of a new product, electrostatically actuated window blinds. The text presents a description of each stage in the prototype development followed by a discussion of different prototyping methods and design for manufacture and assembly issues. Results from electromechanical and thermal analyses of the product itself are also included. This case study determined that, for this product development, the most efficient, cost-effective prototyping solution was simple plastic injection moulding. It also concluded that following good design for manufacture and assembly practices during prototype construction will save time and money when transitioning to a production design. [ABSTRACT FROM AUTHOR]
CASE studies, HUMAN-computer interaction, EPIDEMIOLOGICAL research, DATA visualization software, SOFTWARE architecture, and PROTOTYPES
This paper describes the application of human-computer interaction (HCI) principles and methods to requirements engineering in a case study development of a visualisation tool, ADVISES, to support epidemiological research. The development approach consisted of scenario-based design and analysis of the users' tasks and mental model of the domain. Prototyping and storyboarding techniques were used to explore design options with users as well as specifying functionality for two versions of the software to meet the needs of novice and expert users. Application of HCI functional allocation heuristics to guide system requirements decisions is explained. An evaluation of the prototype was carried out to assess the extent to which the expert model would support public health professionals in their analysis activities. The results of the design exploration requirements analysis study are reported. The implications of scenario-based design exploration, functional allocation and software architecture are discussed. [ABSTRACT FROM AUTHOR]
International Journal of Coal Preparation & Utilization. Mar-Oct2010, Vol. 30 Issue 2-5, p239-251. 13p. 2 Black and White Photographs, 7 Diagrams, 2 Graphs.
CASE studies, COAL preparation plants, PROCESS control systems, MINERAL processing, and COAL preparation
The benefits of various enhanced methodologies in process control are well documented and include safer operation, reduced environmental impact, and improved efficiencies, qualities, and throughputs [1, 2]. Numerous applications of these techniques exist in the fields of petrochemical, oil and gas, pulp and paper, and mineral processing. However, the application of these has been slow to filter through into coal preparation . Variability associated with plant feed rates and the coal seam(s) often results in problems in achieving plant throughput and the desired quality. Since plants are generally designed to average feed specifications and as the feed material qualities change (more or less ash, fines, etc.), the plant operators and control system must compensate accordingly. This article will present two different case studies demonstrating the benefits achievable through improvements in process control techniques. The performance of industrial plants is significantly affected by control loop configuration and the effectiveness of the operator and the interface in use. The first case study will highlight the benefits of prototyping and simulating enhanced control schemes before implementation on the actual plant. The second case study demonstrates how to improve operator situation awareness through enhanced graphics techniques and process alarm rationalization. [ABSTRACT FROM AUTHOR]
AGE distribution, INFORMATION services, WEB development, CASE studies, QUESTIONNAIRES, SCALE analysis (Psychology), T-test (Statistics), TRAVEL, USER interfaces (Computer systems), and ACCESS to information
Website redesign is a complex task that requires the organised use of design methods and guidelines as well as meaningful assessments. An important reason for website redesign is to enhance the usability and accessibility for ‘non-traditional’ user groups like the older population. The paper presents a case study of the redesign of a touristic web portal in order for it to be senior-friendly. The redesign process involved: (a) identification of a set of 7 principles and 45 guidelines (7p/45g) for web design for older adults; (b) heuristic evaluation of the original website on the basis of the identified 7p/45g set; (c) redesign of the website in an interactive online prototype; and (d) comparative summative usability evaluation, which involved 12 older users and post hoc interviews and questionnaires. The results showed that the redesigned website was significantly more usable and acceptable than the original. This study makes two contributions in the field: first, it outlines a web redesign process for older adults, which is effective in terms of time and cost, making use of various assessments of experts and users; second, it presents the application of this process in a manner that can be adopted and repeated in other redesign cases. [ABSTRACT FROM AUTHOR]