Changes in Speed Skating Velocity in Relation to Push-Off Effectiveness

2013 ◽  
Vol 8 (2) ◽  
pp. 188-194 ◽  
Author(s):  
Dionne A. Noordhof ◽  
Carl Foster ◽  
Marco J.M. Hoozemans ◽  
Jos J. de Koning
Keyword(s):  
Radio Frequency Identification ◽  
Muscle Power ◽  
Frontal View ◽  
Power Losses ◽  
Knee Angle ◽  
World Cup ◽  
Speed Skating ◽  
Frequency Identification ◽  
Identification Tags ◽  
Insight Into

Speed skating posture, or technique, is characterized by the push-off angle or effectiveness (e), determined as the angle between the push-off leg and the ice; the preextension knee angle (θ0); and the trunk angle (θ1). Together with muscle-power output and environmental conditions, skating posture, or technique, determines velocity (v).Purpose:To gain insight into technical variables that are important to skate efficiently and perform well, e, θ0, θ1, and skating v were determined every lap during a 5000-m World Cup. Second, the authors evaluated if changes (Δ) in e, θ0, and θ1 are associated with Δv.Methods:One camera filmed the skaters from a frontal view, from which e was determined. Another camera filmed the skaters from a sagittal view, from which θ0 and θ1 were determined. Radio-frequency identification tags around the ankles of the skaters measured v.Results:During the race, e progressively increased and v progressively decreased, while θ0 and θ1 showed a less consistent pattern of change. Generalized estimating equations showed that Δe is significantly associated with Δv over the midsection of the race (β = −0.10, P < .001) and that Δθ0 and Δθ1 are not significantly associated with Δv.Conclusions:The decrease in skating v over the race is not due to increases in power losses to air friction, as knee and trunk angle were not significantly associated with changes in velocity. The decrease in velocity can be partly ascribed to the decrease in effectiveness, which reflects a decrease in power production associated with fatigue.

The Association Between Changes in Speed Skating Technique and Changes in Skating Velocity

2014 ◽  
Vol 9 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Dionne A. Noordhof ◽  
Carl Foster ◽  
Marco J.M. Hoozemans ◽  
Jos J. de Koning
Keyword(s):  
Confidence Interval ◽  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Performance Level ◽  
World Cup ◽  
Video Recordings ◽  
Speed Skating ◽  
Frequency Identification ◽  
Identification Tags ◽  
And Performance

A meaningful association between changes (Δ) in push-off angle or effectiveness (e) and changes in skating velocity (v) has been found during 5000-m races, although no significant association was found between changes in knee (θ0) and trunk angle (θ1) and Δv. It might be that speed skating event, sex, and performance level influence these associations.Purpose:To study the effect of skating event, sex, and performance level on the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.Methods:Video recordings were made from frontal (e) and sagittal views (θ0 and θ1) during 1500- and 5000-m men’s and women’s World Cup races. Radio-frequency identification tags provided data of v.Results:Skating event influenced the association between Δe and Δv, which resulted in a significant association between Δe and Δv for the 5000-m (β = –0.069, 95% confidence interval [–0.11, –0.030]) but not for the 1500-m (β = –0.011 [–0.032, 0.010]). The association between Δθ0 and Δθ1 and Δv was not significantly influenced by skating event. Sex and performance level did not substantially affect the association between Δe and Δv and between Δθ0 and Δθ1 and Δv.Conclusions:Skating event significantly influenced the association between Δe and Δv; a 1° change in e results in a 0.011-m/s decrease in v during the 1500-m and a 0.069-m/s decrease in v during the 5000-m. Thus, it seems especially important to maintain a small e during the 5000-m.

A review of passive self-sensing tag

Sensor Review ◽  
2017 ◽  
Vol 37 (3) ◽  
pp. 338-345 ◽  
Author(s):  
Yawei Xu ◽  
Lihong Dong ◽  
Haidou Wang ◽  
Jiannong Jing ◽  
Yongxiang Lu
Keyword(s):  
Radio Frequency Identification ◽  
Large Scale ◽  
Low Cost ◽  
Integrated Sensor ◽  
Content Type ◽  
Passive Sensing ◽  
Static Information ◽  
Potential Applications ◽  
Frequency Identification ◽  
Identification Tags

Purpose Radio frequency identification tags for passive sensing have attracted wide attention in the area of Internet of Things (IoT). Among them, some tags can sense the property change of objects without an integrated sensor, which is a new trend of passive sensing based on tag. The purpose of this paper is to review recent research on passive self-sensing tags (PSSTs). Design/methodology/approach The PSSTs reported in the past decade are classified in terms of sensing mode, composition and the ways of power supply. This paper presents operation principles of PSSTs and analyzes the characteristics of them. Moreover, the paper focuses on summarizing the latest sensing parameters of PSSTs and their matching equipment. Finally, some potential applications and challenges faced by this emerging technique are discussed. Findings PSST is suitable for long-term and large-scale monitoring compared to conventional sensors because it gets rid of the limitation of battery and has relatively low cost. Also, the static information of objects stored in different PSSTs can be identified by a single reader without touch. Originality/value This paper provides a detailed and timely review of the rapidly growing research in PSST.

A comparative study of RFID adoption patterns in retail

2021 ◽  
pp. 1-20
Author(s):  
Narges Kasiri ◽  
G. Scott Erickson ◽  
Gerd Wolfram
Keyword(s):  
Comparative Study ◽  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Structural Model ◽  
Slow Pace ◽  
The Us ◽  
Frequency Identification ◽  
Insight Into ◽  
Current Stage ◽  
Over Time

Radio frequency identification (RFID) has been viewed as a promising technology for quite some time. Initially developed a couple of decades ago, the technology has been accompanied by predictions of imminent widespread adoption since its beginnings. A majority of retailers and other users are now using or planning to use the technology. This paper employs a combination of the technology-organization-environment (TOE) model and the 3-S (substitution, scale, structural) model to analyze the long journey of RFID adoption in retail. Top retail executives in the US and Europe were interviewed to investigate RFID adoption patterns based on differences in technological, organizational, and environmental circumstances. As the retail industry is moving into a post-adoption era, these results demonstrate the current stage of retail RFID adoption, identify factors playing important roles over time as motivators or impediments, and provide some insight into the slow pace of adoption.

Reliability evaluation of wearable radio frequency identification tags: Design and fabrication of a two-part textile antenna

2018 ◽  
Vol 89 (4) ◽  
pp. 560-571 ◽  
Author(s):  
Xiaochen Chen ◽  
Leena Ukkonen ◽  
Johanna Virkki
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Integrated Circuit ◽  
High Performance ◽  
Cyclic Strain ◽  
Moist Environment ◽  
Frequency Identification ◽  
Identification Tags ◽  
Cost Efficient ◽  
The One

Passive radio frequency identification-based technology is a convincing approach to the achievement of versatile energy- and cost-efficient wireless platforms for future wearable applications. By using two-part antenna structures, the antenna-electronics interconnections can remain non-stressed, which can significantly improve the reliability of the textile-embedded wireless components. In this article, we describe fabrication of two-part stretchable and non-stretchable passive ultra-high frequency radio frequency identification textile tags using electro-textile and embroidered antennas, and test their reliability when immersed as well as under cyclic strain. The results are compared to tags with traditional one-part dipole antennas fabricated from electro-textiles and by embroidery. Based on the results achieved, the initial read ranges of the two-part antenna tags, around 5 m, were only slightly shorter than those of the one-part antenna tags. In addition, the tag with two-part antennas can maintain high performance in a moist environment and during continuous stretching, unlike the one-part antenna tag where the antenna-integrated circuit attachment is under stress.

Enabling Technologies in an Ambient Intelligence (AmI) System

2010 ◽  
pp. 296-315
Author(s):  
Simrn Kaur Gill ◽  
Kathryn Cormican
Keyword(s):  
Radio Frequency Identification ◽  
Ambient Intelligence ◽  
Reference Model ◽  
New Venture ◽  
New Paradigm ◽  
Everyday Objects ◽  
Enabling Technologies ◽  
Information And Communication ◽  
Frequency Identification ◽  
Identification Tags

This chapter introduces the concept of Ambient Intelligence (AmI) with regard to the enabling technologies and how they are combined to assist e-entrepreneurs. AmI is a new paradigm in the area of Information and Communication Technology (ICT). AmI allows for seamless interaction between the human and technology. The AmI system provides the human user with information and decision support tailored to their specific needs. To achieve seamless interaction between the human and technology requires the environment that surrounds the human to be embedded with technology in everyday objects. These technologies gather information that the AmI system uses to adapt its responses to the human user. The aim of the chapter is to provide a better understanding of the AmI process and knowledge of the AmI system and tools. To this end three of the enabling technologies are discussed: semantic web, multi-modal services, and radio frequency identification tags. These technologies are then examined within the AmI reference model. The reference model provides an understanding of how the technologies can be combined to achieve different AmI features for the human users. This toolkit can be used by a new venture in the area of e-entrepreneurship to provide AmI to service providers, new businesses and traditional industries.

The Invisible Hand Guiding Technology

2011 ◽  
Vol 2 (4) ◽  
pp. 1-15
Author(s):  
Nada K. Kakabadse ◽  
Andrew Kakabadse ◽  
Reeves Knyght ◽  
Linda Lee-Davies
Keyword(s):  
Human Rights ◽  
Radio Frequency Identification ◽  
Qualitative Methodology ◽  
Invisible Hand ◽  
Rfid Technology ◽  
Domestic Life ◽  
Frequency Identification ◽  
Study Participants ◽  
Near Future ◽  
Insight Into

This paper examines attitudes towards Radio Frequency Identification (RFID) technology and explores the wider concerns of the ever increasing prospect of social tagging. Capturing vignettes and narratives from a sample of study participants, the paper highlights concerns about adopting RFID implements now and in the future. The views captured through qualitative methodology act as the platform for a wider argument concerning the human rights and privacy intrusion concerns over IT applications. Intended as an insight into the reality of technology impact, this paper lists a series of questions for leaders to consider over matters of human rights specifically concerning RFID adoption. The authors conclude that caution, naivety and fear are the underlying reasons for society accepting RFIDs without question and that RFIDs will be a part of everyday working and domestic life in the near future.

Utilizing Modeling in a Reliability Study of ACA Joints in Humidity Tests

2013 ◽  
Vol 10 (1) ◽  
pp. 30-39 ◽  
Author(s):  
Kirsi Saarinen ◽  
Laura Frisk
Keyword(s):  
Radio Frequency Identification ◽  
Cost Savings ◽  
Experimental Tests ◽  
Shear Stresses ◽  
Cycling Test ◽  
Humidity Level ◽  
Anisotropic Conductive Adhesive ◽  
Frequency Identification ◽  
Identification Tags ◽  
Selection Of

Radio frequency identification tags (RFID) with anisotropic conductive adhesive (ACA) joints are used in various applications where the environmental conditions may impair their reliability. Thus the effects of different environmental stresses on reliability need to be investigated. The purpose of this work was to study whether a relatively simple shear stress model can be utilized in reliability prediction of anisotropically conductive paste (ACP) joints in an accelerated humidity test on the basis of the information obtained from another humidity test. If modeling gives accurate results when studying reliability, the need for actual testing would decrease and thereby time and cost savings could be achieved. In this study, finite element models were made to calculate shear stresses in ACP joints induced by two different humidity tests. Additionally, experimental tests were performed and the results were compared with those of modeling. The test samples were RFID tags whose microchips were attached with ACP. A constant humidity test was used to study the effects of high humidity level and a humidity cycling test was used to examine the effects of constantly varying humidity. In the modeling it was observed that the selection of the stress-free temperature has a significant effect on the results. With three different stress-free temperatures, three different sets of results were obtained. Although the tags saturated in the extreme conditions of the humidity cycling test, according to modeling, the change in relative humidity level in the humidity cycling test did not increase the harshness of the test. However, the temperature change in the humidity cycling test increased the harshness.

scholarly journals Wireless Breast Localization Using Radio-frequency Identification Tags: The First Reported European Experience in Breast Cancer

In Vivo ◽  
2019 ◽  
Vol 34 (1) ◽  
pp. 233-238 ◽  
Author(s):  
UMAR WAZIR ◽  
SALIM TAYEH ◽  
NICHOLAS PERRY ◽  
MICHAEL MICHELL ◽  
ANMOL MALHOTRA ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Radio Frequency ◽  
Radio Frequency Identification ◽  
European Experience ◽  
Frequency Identification ◽  
Identification Tags
Sign in / Sign up

Export Citation Format

Share Document