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Technologies, Volume 2, Issue 2 (June 2014), Pages 54-114

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Research

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Open AccessArticle Development of a Large, Low-Cost, Instant 3D Scanner
Technologies 2014, 2(2), 76-95; doi:10.3390/technologies2020076
Received: 19 February 2014 / Revised: 10 May 2014 / Accepted: 12 May 2014 / Published: 20 May 2014
Cited by 8 | PDF Full-text (848 KB) | HTML Full-text | XML Full-text
Abstract
Three-dimensional scanning serves a large variety of uses. It can be utilized to generate objects for, after possible modification, 3D printing. It can facilitate reverse engineering, replication of artifacts to allow interaction without risking cultural heirlooms and the creation of replacement bespoke [...] Read more.
Three-dimensional scanning serves a large variety of uses. It can be utilized to generate objects for, after possible modification, 3D printing. It can facilitate reverse engineering, replication of artifacts to allow interaction without risking cultural heirlooms and the creation of replacement bespoke parts. The technology can also be used to capture imagery for creating holograms, it can support applications requiring human body imaging (e.g., medical, sports performance, garment creation, security) and it can be used to import real-world objects into computer games and other simulations. This paper presents the design of a 3D scanner that was designed and constructed at the University of North Dakota to create 3D models for printing and numerous other uses. It discusses multiple prospective uses for the unit and technology. It also provides an overview of future directions of the project, such as 3D video capture. Full article
Open AccessArticle Electronic Spatial Assistance for People with Dementia: Choosing the Right Device
Technologies 2014, 2(2), 96-114; doi:10.3390/technologies2020096
Received: 18 December 2013 / Revised: 28 May 2014 / Accepted: 28 May 2014 / Published: 13 June 2014
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Abstract
The demographic change and ageing in Europe will lead to a growing number of people suffering from dementia. Consequently, costs for public health will increase because people become more and more reliant on care and gradually lose their independence and mobility. In [...] Read more.
The demographic change and ageing in Europe will lead to a growing number of people suffering from dementia. Consequently, costs for public health will increase because people become more and more reliant on care and gradually lose their independence and mobility. In the case of dementia, remedial measures could be provided by assistive technology to support independent living at home for as long as possible. Current assistance systems are often limited to actively raising an alert (i.e., electronic panic buttons) or location tracking. Due to this small range of functions these systems are poorly accepted by the target group. Thus, this paper reports on a selection process for a spatial data collection device allowing the development of a new so-called mobility safeguarding assistance system for people with dementia which combines features of different systems. In particular, the wearability as an everyday object is a key issue when it comes to identifying an adequate gadget for elderly people. The proposed methodology considers user requirements as well as technical requirements when it comes to finding a suitable device. Based on these requirements, several different devices were reviewed and tested in order to find most suitable potential device as part of the selection process. The device selected shows that the proposed process on how to choose the right device performed well. Full article

Review

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Open AccessReview Applications of Optical Interferometer Techniques for Precision Measurements of Changes in Temperature, Growth and Refractive Index of Materials
Technologies 2014, 2(2), 54-75; doi:10.3390/technologies2020054
Received: 13 December 2013 / Revised: 16 March 2014 / Accepted: 27 March 2014 / Published: 5 May 2014
Cited by 2 | PDF Full-text (991 KB) | HTML Full-text | XML Full-text
Abstract
Optical metrology techniques used to measure changes in thickness; temperature and refractive index are surveyed. Optical heterodyne detection principle and its applications for precision measurements of changes in thickness and temperature are discussed. Theoretical formulations are developed to estimate crystal growth rate, [...] Read more.
Optical metrology techniques used to measure changes in thickness; temperature and refractive index are surveyed. Optical heterodyne detection principle and its applications for precision measurements of changes in thickness and temperature are discussed. Theoretical formulations are developed to estimate crystal growth rate, surface roughness and laser cooling/heating of solids. Applications of Michelson and Mach-Zehnder interferometers to measure temperature changes in laser heating of solids are described. A Mach-Zehnder interferometer is used to measure refractive index and concentration variations of solutions in crystal growth experiments. Additionally, fluorescence lifetime sensing and fluorescence ratio method are described for temperature measurement. For all the above techniques, uncertainty calculations are included. Full article
(This article belongs to the Special Issue Precision Measurements and Metrology Using Lasers)

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