scholarly journals Indoor acoustic localization: a survey

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Manni Liu ◽  
Linsong Cheng ◽  
Kun Qian ◽  
Jiliang Wang ◽  
Jin Wang ◽  
...  
Keyword(s):  
Indoor Localization ◽  
Inertial Sensors ◽  
Comprehensive Overview ◽  
Acoustic Localization ◽  
Latency Range ◽  
Body Tracking ◽  
Radio Frequency Signals ◽  
Time Latency ◽  
Future Work ◽  
Distinguishing Features

AbstractApplications of localization range from body tracking, gesture capturing, indoor plan construction to mobile health sensing. Technologies such as inertial sensors, radio frequency signals and cameras have been deeply excavated to locate targets. Among all the technologies, the acoustic signal gains enormous favor considering its comparatively high accuracy with common infrastructure and low time latency. Range-based localization falls into two categories: absolute range and relative range. Different mechanisms, such as Time of Flight, Doppler effect and phase shift, are widely studied to achieve the two genres of localization. The subcategories show distinguishing features but also face diverse challenges. In this survey, we present a comprehensive overview on various indoor localization systems derived from the various mechanisms. We also discuss the remaining issues and the future work.

scholarly journals Wearable Technologies in Field Hockey Competitions: A Scoping Review

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5242
Author(s):  
Jolene Ziyuan Lim ◽  
Alexiaa Sim ◽  
Pui Wah Kong
Keyword(s):  
Heart Rate ◽  
Inertial Sensors ◽  
Wearable Devices ◽  
Field Hockey ◽  
Heart Rate Monitors ◽  
Search Terms ◽  
Physiological Demands ◽  
And Performance ◽  
Future Work ◽  
Skin Temperatures

The aim of this review is to investigate the common wearable devices currently used in field hockey competitions, and to understand the hockey-specific parameters these devices measure. A systematic search was conducted by using three electronic databases and search terms that included field hockey, wearables, accelerometers, inertial sensors, global positioning system (GPS), heart rate monitors, load, performance analysis, player activity profiles, and competitions from the earliest record. The review included 39 studies that used wearable devices during competitions. GPS units were found to be the most common wearable in elite field hockey competitions, followed by heart rate monitors. Wearables in field hockey are mostly used to measure player activity profiles and physiological demands. Inconsistencies in sampling rates and performance bands make comparisons between studies challenging. Nonetheless, this review demonstrated that wearable devices are being used for various applications in field hockey. Researchers, engineers, coaches, and sport scientists can consider using GPS units of higher sampling rates, as well as including additional variables such as skin temperatures and injury associations, to provide a more thorough evaluation of players’ physical and physiological performances. Future work should include goalkeepers and non-elite players who are less studied in the current literature.

scholarly journals End-to-End Sequential Indoor Localization Using Smartphone Inertial Sensors and WiFi

2021 ◽  
Author(s):  
Mukhamet Nurpeiissov ◽  
Askat Kuzdeuov ◽  
Aslan Assylkhanov, ◽  
Yerbolat Khassanov ◽  
Hüseyin Atakan Varol
Keyword(s):  
Indoor Localization ◽  
Inertial Sensors ◽  
Sampling Rate ◽  
Reference Points ◽  
Measurement Unit ◽  
Localization System ◽  
Practical Applications ◽  
External Data ◽  
End To End ◽  
Commercial Off The Shelf

This paper addresses sequential indoor localization using WiFi and Inertial Measurement Unit (IMU) modules commonly found in commercial off-the-shelf smartphones. Specifically, we developed an end-to-end neural network-based localization system integrating WiFi received signal strength indicator (RSSI) and IMU data without external data fusion models. The developed system leverages the advantages of WiFi and IMU modules to locate finer-level sequential positions of a user at 150 Hz sampling rate. Additionally, to demonstrate the efficacy of the proposed approach, we created the IMUWiFine dataset comprising IMU and WiFi RSSI readings sequentially collected at fine-level reference points. The dataset contains 120 trajectories covering an aggregate distance of over 14 kilometers. We conducted extensive experiments using deep learning models and achieved a mean error distance of 1.1 meters on an unseen evaluation set, which makes our approach suitable for many practical applications requiring meter-level accuracy. To enable experiment and result reproducibility, we made the developed localization system and IMUWiFine dataset publicly available in our GitHub repository.<br>

scholarly journals A comprehensive overview on the fundamentals of curriculum development: understanding key interrelated theoretical aspects

2019 ◽  
Vol 8 (11) ◽  
pp. 148-168
Author(s):  
Diego Ortega-Auquilla ◽  
Irma Fajardo-Pacheco ◽  
Johanna Cabrera-Vintimilla ◽  
Paul Siguenza-Garzón
Keyword(s):  
Curriculum Development ◽  
Curriculum Design ◽  
School Administrators ◽  
School Curriculum ◽  
Daily Basis ◽  
Assessment Practices ◽  
Comprehensive Overview ◽  
The Social ◽  
Curriculum Making ◽  
Future Work

Learning about curriculum in general and the essentials of curriculum development may facilitate teachers and future curriculum workers make informed decisions and take part in the field of school curriculum more meaningfully. Thus it is paramount to examine the educational philosophies; the social and educational forces that impact the curriculum; models, process and the major stages of curriculum development; and its levels of control. Through analyzing and better understanding the aforementioned topics readers will be likely to have a more complete picture of what curriculum development entails. Therefore, this paper may be regarded as a contribution for (novice) educators’ future work in the field of curriculum design, as well as it may be seen as an informative piece of work for those who are interested in taking leadership in this field by becoming curriculum specialistis. In the end, the information of this paper makes us reflect on the notion that curriculum making is not confined to school administrators and specialists only, but especially to teachers who are involved in curricular activities on daily basis, such as planning lessons, selecting materials for classroom use, utilizing a variety of teaching methodologies, and creating assessment practices.

Design and Implementation Issues for Convincing Conversational Agents

2011 ◽  
pp. 156-176 ◽  
Author(s):  
Markus Löckelt
Keyword(s):  
Interactive Narrative ◽  
Dialogue Systems ◽  
Conversational Agents ◽  
Comprehensive Overview ◽  
Design And Implementation ◽  
Implementation Level ◽  
Multimodal Dialogue ◽  
Task Oriented ◽  
Future Work ◽  
New System

This chapter describes a selection of experiences from designing and implementing virtual conversational characters for multimodal dialogue systems. It uses examples from the large interactive narrative VirtualHuman and some related systems of the task-oriented variety. The idea is not to give a comprehensive overview of any one system, but rather to identify and describe some issues that might also be relevant for the designer of a new system, to show how they can be addressed, and what problems still remain unresolved for future work. Besides giving an overview of how characters for interactive narrative systems can be built in the implementation level, the focus is on what should be in the knowledge base for virtual characters, and how it should be organized to be able to provide a convincing interaction with one or multiple characters.

scholarly journals Translational Acceleration, Rotational Speed, and Joint Angle of Patients Related to Correct/Incorrect Methods of Transfer Skills by Nurses

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2975 ◽  
Author(s):  
Chingszu Lin ◽  
Masako Kanai-Pak ◽  
Jukai Maeda ◽  
Yasuko Kitajima ◽  
Mitsuhiro Nakamura ◽  
...  
Keyword(s):  
Nursing Faculty ◽  
Rotational Speed ◽  
Joint Angle ◽  
Inertial Sensors ◽  
Simulated Patients ◽  
Clinic Experience ◽  
The Difference ◽  
Future Work ◽  
Translational Acceleration ◽  
Nursing Teachers

Currently, due to shortages in the nursing faculty and low access to actual patients, it is difficult for students to receive feedback from teachers and practice with actual patients to obtain clinic experience. Thus, both evaluation systems and simulated patients have become urgent requirements. Accordingly, this study proposes a method to evaluate the nurse’s transfer skill through observation from the patient. After verifying the proposed method, it will be integrated with a robotic patient as a future work. To verify if such an evaluation is practical, a checklist comprising 16 steps with correct and incorrect methods was proposed by the nursing teachers. Further, the evaluation parameters were determined as translational acceleration, rotational speed, and joint angle of patient. Inertial sensors and motion capture were employed to measure the translational acceleration, rotational speed, and joint angle. An experiment was conducted with two nursing teachers, who were asked to carry out both correct and incorrect methods. According to the results, three parameters reveal the difference for a patient under correct/incorrect methods and can further be used to evaluate the nurse’s skill once the thresholds are determined. In addition, the applicability of inertial sensors is confirmed for the use of robot development.

scholarly journals iBILL: Using iBeacon and Inertial Sensors for Accurate Indoor Localization in Large Open Areas

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 14589-14599 ◽  
Author(s):  
Xudong Wu ◽  
Ruofei Shen ◽  
Luoyi Fu ◽  
Xiaohua Tian ◽  
Peng Liu ◽  
...  
Keyword(s):  
Indoor Localization ◽  
Inertial Sensors
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