7 research outputs found
Personal History and List of Main Publications of Professor
Other信州大学経済学論集 67: 59-64(2016)othe
Position Tracking for Passive UHF RFID Tags with the Aid of a Scanned Array
Thanks to the proliferation of radio frequency identification systems (RFID), applications have emerged concerning positioning techniques for inexpensive passive RFID tags. The most accurate approaches for tracking the tag's position, deliver precision in the order of 20 cm over a range of a few meters and require moving parts in a predefined pattern (mechanical antenna steering), which limits their application. Herein, we introduce an RFID tag positioning system that utilizes an active electronically-steered array, based on the principles of modern radar systems. We thoroughly examine and present the main attributes of the system with the aid of an finite element method simulation model and investigate the system performance with far-field tests. The demonstrated positioning precision of 1.5, which translates to under 1 cm laterally for a range of a few meters can be helpful in applications like mobile robot localization and the automated handling of packaged goods.DF
Advances in UWB-based Indoor Position Estimation and its Application in Fall Detection
In an indoor propagation environment, the position of an Object of
Interest (OOI) is typically estimated by cleverly manipulating range
or proximity measurements that are obtained from a series of reference
node combinations. In a noise-free propagation scenario, these
measured parameters are fed into conventional position estimation
techniques and an accurate estimate of the OOI’s position is obtained.
In practice, the propagation scenario is never quite noise-free; hence
the OOI’s position estimate is obtained in error. Ultra-Wideband
(UWB) is a wireless communication technology that is able to resolve
individual multipath components and this ensures that it is capable
of estimating the arrival time of the first signal path. The implication
of this lies in the fact that the accuracy of the range or proximity
measurements obtained from the reference node combinations is guaranteed;
hence leading to a reliable estimate of the OOI’s position.
In the research work presented in this thesis, the body of knowledge
that relates to indoor position estimation is advanced upon. With a
primary focus of enhancing the estimation accuracy of indoor position
estimation systems, UWB is utilised as the underlying wireless
communications technology. The challenges faced by current UWBbased
position estimation systems are identified and tackled directly.
Specifically, the position estimation error that is due to multipath
propagation is addressed and a pre-localisation algorithm that serves
the purpose of resolving individual multipath UWB signals in the
immediate environment is proposed.
Additionally, a novel position estimation technique coined as Time
Reflection of Arrival (TROA) is presented in this thesis. Through a
series of Mean Squared Error (MSE) and Cram´er-Rao Lower Bound
(CRLB) analyses, TROA is shown to be very effective when compared
to TOA and the typically unvoiced TSOA technique. In the last section
of this thesis, an application of UWB in the area of Biomedical
Engineering is demonstrated. Specifically, UWB-based position estimation
is used to define a novel fall detection algorithm tailored for
Dementia patients
Factors Influencing Customer Satisfaction towards E-shopping in Malaysia
Online shopping or e-shopping has changed the world of business and quite a few people have
decided to work with these features. What their primary concerns precisely and the responses from
the globalisation are the competency of incorporation while doing their businesses. E-shopping has
also increased substantially in Malaysia in recent years. The rapid increase in the e-commerce
industry in Malaysia has created the demand to emphasize on how to increase customer satisfaction
while operating in the e-retailing environment. It is very important that customers are satisfied with
the website, or else, they would not return. Therefore, a crucial fact to look into is that companies
must ensure that their customers are satisfied with their purchases that are really essential from the ecommerce’s
point of view. With is in mind, this study aimed at investigating customer satisfaction
towards e-shopping in Malaysia. A total of 400 questionnaires were distributed among students
randomly selected from various public and private universities located within Klang valley area.
Total 369 questionnaires were returned, out of which 341 questionnaires were found usable for
further analysis. Finally, SEM was employed to test the hypotheses. This study found that customer
satisfaction towards e-shopping in Malaysia is to a great extent influenced by ease of use, trust,
design of the website, online security and e-service quality. Finally, recommendations and future
study direction is provided.
Keywords: E-shopping, Customer satisfaction, Trust, Online security, E-service quality, Malaysia
Epidemiology of Injury in English Women's Super league Football: A Cohort Study
INTRODUCTION: The epidemiology of injury in male professional football has been well documented (Ekstrand, Hägglund, & Waldén, 2011) and used as a basis to understand injury trends for a number of years. The prevalence and incidence of injuries occurring in womens super league football is unknown. The aim of this study is to estimate the prevalence and incidence of injury in an English Super League Women’s Football squad. METHODS: Following ethical approval from Leeds Beckett University, players (n = 25) signed to a Women’s Super League Football club provided written informed consent to complete a self-administered injury survey. Measures of exposure, injury and performance over a 12-month period was gathered. Participants were classified as injured if they reported a football injury that required medical attention or withdrawal from participation for one day or more. Injuries were categorised as either traumatic or overuse and whether the injury was a new injury and/or re-injury of the same anatomical site RESULTS: 43 injuries, including re-injury were reported by the 25 participants providing a clinical incidence of 1.72 injuries per player. Total incidence of injury was 10.8/1000 h (95% CI: 7.5 to 14.03). Participants were at higher risk of injury during a match compared with training (32.4 (95% CI: 15.6 to 48.4) vs 8.0 (95% CI: 5.0 to 10.85)/1000 hours, p 28 days) of which there were three non-contact anterior cruciate ligament (ACL) injuries. The epidemiological incidence proportion was 0.80 (95% CI: 0.64 to 0.95) and the average probability that any player on this team will sustain at least one injury was 80.0% (95% CI: 64.3% to 95.6%) CONCLUSION: This is the first report capturing exposure and injury incidence by anatomical site from a cohort of English players and is comparable to that found in Europe (6.3/1000 h (95% CI 5.4 to 7.36) Larruskain et al 2017). The number of ACL injuries highlights a potential injury burden for a squad of this size. Multi-site prospective investigations into the incidence and prevalence of injury in women’s football are require