52 research outputs found
Design and Development of a Research Framework for Prototyping Control Tower Augmented Reality Tools
The purpose of the air traffic management system is to ensure the safe and efficient flow of air traffic. Therefore, while augmenting efficiency, throughput and capacity in airport operations, attention has rightly been placed on doing it in a safe manner.
In the control tower, many advances in operational safety have come in the form of visualization tools for tower controllers. However, there is a paradox in developing such systems to increase controllers' situational awareness: by creating additional computer displays, the controller's vision is pulled away from the outside view and the time spent looking down at the monitors is increased. This reduces their situational awareness by forcing them to mentally and physically switch between the head-down equipment and the outside view.
This research is based on the idea that augmented reality may be able to address this issue. The augmented reality concept has become increasingly popular over the past decade and is being proficiently used in many fields, such as entertainment, cultural heritage, aviation, military & defense. This know-how could be transferred to air traffic control with a relatively low effort and substantial benefits for controllers’ situation awareness.
Research on this topic is consistent with SESAR objectives of increasing air traffic controllers’ situation awareness and enable up to 10 % of additional flights at congested airports while still increasing safety and efficiency.
During the Ph.D., a research framework for prototyping augmented reality tools was set up. This framework consists of methodological tools for designing the augmented reality overlays, as well as of hardware and software equipment to test them. Several overlays have been designed and implemented in a simulated tower environment, which is a virtual reconstruction of Bologna airport control tower. The positive impact of such tools was preliminary assessed by means of the proposed methodology
3D-in-2D Displays for ATC.
This paper reports on the efforts and accomplishments
of the 3D-in-2D Displays for ATC project at the end of Year 1.
We describe the invention of 10 novel 3D/2D visualisations that
were mostly implemented in the Augmented Reality ARToolkit.
These prototype implementations of visualisation and interaction
elements can be viewed on the accompanying video. We have
identified six candidate design concepts which we will further
research and develop. These designs correspond with the early
feasibility studies stage of maturity as defined by the NASA
Technology Readiness Level framework. We developed the
Combination Display Framework from a review of the literature,
and used it for analysing display designs in terms of display
technique used and how they are combined. The insights we
gained from this framework then guided our inventions and the
human-centered innovation process we use to iteratively invent.
Our designs are based on an understanding of user work
practices. We also developed a simple ATC simulator that we
used for rapid experimentation and evaluation of design ideas.
We expect that if this project continues, the effort in Year 2 and 3
will be focus on maturing the concepts and employment in a
operational laboratory settings
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Creation of a low-cost magnetic resonance system for the early detection of preeclampsia
The placenta is a temporary organ that develops after the implantation of a fertilized egg in the uterus, and it functions as an interface between the mother and the foetus to provide sufficient foetus nutrition. Various studies have shown that the magnetic resonance relaxation times of the placenta change during pregnancy, which could be an early indicator of a disease, such as preeclampsia (PE). However, magnetic resonance imaging (MRI) is not a suitable routine for pregnant women due to cost and availability. Low-field unilateral nuclear magnetic resonance (NMR) is a low-cost alternative capable of measuring relaxation times at a single point in space. Although the frequently adopted ultrasound imaging offers an easy technique to locate the placenta, it does not have the potential for early diagnosis of diseases like PE. Therefore, combining the two modalities, (ultrasound and low-field NMR) opens up a novel diagnostic approach at a much lower cost. This thesis aims to develop a low-field unilateral NMR system capable of measuring the relaxation time parameters at a distance from the sensor surface equivalent to the human placenta position.
This study reports the development of a low-field magnetic resonance system, called NMR-CAPIBarA (Clinical Assessment of Patients Implemented with Bar magnet Arrays), capable of measuring spin-lattice relaxation time (T1) and effective transverse relaxation time (Teff2 ) covering the whole range of values relevant to the developing placenta. Two different materials were used to mimic the placental tissue relaxation time values presented in previous literature: PDMS silicone oils representing Teff2 and full-fat milk powder solution representing T1. The low-field electronic system was operated at a magnetic field of 18 mT and was successful in generating and detecting NMR signals using two types of radiofrequency coils: a solenoid and a printed circuit board surface coil, paired with the constructed planar magnet. The most significant result is the positive correlation between the relaxation times measured on the developed system when compared to the same measurements made by a commercial MRI scanner. In particular, the values obtained from the different silicone oil viscosities showed the capability of the low-field system to provide quantitative relaxation measurements over a range of required values to predict the health of the placenta, assuring that the proposed diagnostic approach is quite promising
Subtitling Humour from the Perspective of Relevance Theory: The Office in Traditional Chinese
Subtitling the scenes containing humorous utterances in cinematic-televisual productions encounters a myriad of challenges, because the subtitler has to face the technical constraints that characterise the professional subtitling environment and the cultural barriers when reproducing humorous utterances for viewers inhabiting another culture. Past studies tend to explore more limited humour-related areas, which means that a more comprehensive picture of this specialised field is missing. The current research investigates the subtitling of humour, drawing on the framework of relevance theory and the British sitcom The Office, translated from English dialogue into Traditional Chinese subtitles. This research enquires into whether or not relevance theory can explain the subtitling strategies activated to deal with various humorous utterances in the sitcom, and, if so, to what extent. The English-Chinese Corpus of The Office (ECCO), which contains sample texts, media files and annotations, has been constructed to perform an empirical study. To enrich the corpus with valuable annotations, a typology of humour has been developed based on the concept of frame, and a taxonomy of subtitling strategies has also been proposed. The quantitative analysis demonstrates that the principle of relevance is the main benchmark for the choice of a subtitling micro-strategy within any given macro-strategy. With the chi-square test, it further proves the existence of a statistically significant association between humour types/frames and subtitling strategies at the global level. The qualitative analysis shows that the principle of relevance can operate in a subtle way, in which the subtitler invests more cognitive efforts to enhance the acceptability of subtitles. It also develops three levels of mutual dependency between the two variables, from strong, weak to null, to classify different examples. Overall, this study improves our understanding of humour translation and can facilitate a change in the curricula of translator training
The design and analysis of an ultrasonic linear actuator mechanism for zoom lens control on aircraft mounted cameras
Abstract: The demand for compact military and aerospace imaging devices is increasing. These devices are required to be lightweight, durable and reliable. Most existing compact imaging devices use a miniature cam drive mechanism to control the zoom lens. However, high-speed friction induces excessive wear between the surfaces of moving parts in the zoom lens system, reducing its durability. Additionally, the cam drive mechanism also has many moving parts, which decreases its reliability...M.Tech. (Mechanical Engineering
Engaging Environmental Turbulence
In the academic debate on dealing with environmental turbulence survival or organizational success is being presented as a result of activating dynamic capabilities to repetitively create temporary advantages. A practical question left open in this debate is which organizational determinants matter in the development and deployment of dynamic capabilities. Based on existing strategic management literature this study has derived absorptive capacity, modular organizing, and lateral coordination as important determinants to invest in when confronted with environmental turbulence. The Netherlands armed forces have been selected as the study’s central research case, because this organization faces the similar demand of combining organizational change and stability as many profit organizations do. The study’s main assumption is that giving insight into the way in which the Netherlands armed forces apply the above mentioned determinants, could also be of value for organizations operating in a less extreme business context. The findings show that lateral coordination, absorptive capacity, and modular organizing some or less equally influence the activation of a mixture of strategic, structural, and operational dynamic capabilities. Furthermore, the results demonstrate that this mixture of dynamic capabilities has a positive impact on organizational performance as long as the level of environmental turbulence is not becoming too high. This has to do with the fact that dynamic capabilities follow a rather patterned mode of change, and are, therefore, less useful in situations of extreme turbulence, where primarily quick and ad hoc problem solving is required
Time Localization of Abrupt Changes in Cutting Process using Hilbert Huang Transform
Cutting process is extremely dynamical process influenced by different phenomena such as chip formation, dynamical responses and condition of machining system elements. Different phenomena in cutting zone have signatures in different frequency bands in signal acquired during process monitoring. The time localization of signal’s frequency content is very important.
An emerging technique for simultaneous analysis of the signal in time and frequency domain that can be used for time localization of frequency is Hilbert Huang Transform (HHT). It is based on empirical mode decomposition (EMD) of the signal into intrinsic mode functions (IMFs) as simple oscillatory modes. IMFs obtained using EMD can be processed using Hilbert Transform and instantaneous frequency of the signal can be computed.
This paper gives a methodology for time localization of cutting process stop during intermittent turning. Cutting process stop leads to abrupt changes in acquired signal correlated to certain frequency band. The frequency band related to abrupt changes is localized in time using HHT. The potentials and limitations of HHT application in machining process monitoring are shown
Construction management abstracts : cumulative abstracts and indexes of journals in construction management, 1983-2000
The purpose of this document is to provide a single source of reference for
every paper published in the journals directly related to research in
Construction Management.
It is indexed by author and keyword and contains the titles, authors, abstracts
and keywords of every article from the following journals:
• Building Research and Information (BRI)
• Construction Management and Economics (CME)
• Engineering, Construction and Architectural Management (ECAM)
• Journal of Construction Procurement (JCP)
• Journal of Construction Research (JCR)
• Journal of Financial Management in Property and Construction (JFM)
• RICS Research Papers (RICS)
The index entries give short forms of the bibliographical citations, rather than
page numbers, to enable annual updates to the abstracts. Each annual
update will carry cumulative indexes, so that only one index needs to be
consulted
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