scholarly journals Optimized Electrode Locations for Wearable Single-Lead ECG Monitoring Devices: A Case Study Using WFEES Modules based on the LANS Method

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4458
Author(s):  
Zhu ◽  
Pan ◽  
Wu ◽  
Huan
Keyword(s):  
Signal To Noise Ratio ◽  
Electrode Pair ◽  
Ecg Monitoring ◽  
Principal Diagonal ◽  
Left Chest ◽  
Electrode Location ◽  
Analysis Process ◽  
Body Surface Potential ◽  
Monitoring Devices

Body surface potential mapping (BSPM) is a valuable tool for research regarding electrocardiograms (ECG). However, the BSPM system is limited by its large number of electrodes and wires, long installation time, and high computational complexity. In this paper, we designed a wearable four-electrode electrocardiogram-sensor (WFEES) module that measures six-channel ECGs simultaneously for ECG investigation. To reduce the testing lead number and the measurement complexity, we further proposed a method, the layered (A, N) square-based (LANS) method, to optimize the ECG acquisition and analysis process using WFEES modules for different applications. Moreover, we presented a case study of electrode location optimization for wearable single-lead ECG monitoring devices using WFEES modules with the LANS method. In this study, 102 sets of single-lead ECG data from 19 healthy subjects were analyzed. The signal-to-noise ratio of ECG, as well as the mean and coefficient of variation of QRS amplitude, was derived among different channels to determine the optimal electrode locations. The results showed that a single-lead electrode pair should be placed on the left chest above the electrode location of standard precordial leads V1 to V4. Additionally, the best orientation was the principal diagonal as the direction of the heart’s electrical axis.

A Case Study of a Large and Rare Pleomorphic Liposarcoma in The Chest Area

2020 ◽  
Author(s):  
Yuanjun Cheng
Keyword(s):  
Delayed Diagnosis ◽  
Clinical Work ◽  
Radical Excision ◽  
Pathological Findings ◽  
Chest Tightness ◽  
Pleomorphic Liposarcoma ◽  
Left Chest ◽  
Specific Symptoms ◽  
Work Up

Pleomorphic liposarcoma rarely develops in the chest area. This report presents a primary pleomorphic liposarcoma that was discovered in the left chest area of a 74-year-old female patient. The patient had presented specific symptoms, including cough, chest tightness and shortness of breath. A radical excision of the tumor was performed. The tumor was extremely large (27 cm - 24 cm- 10 cm) and completely encapsulated. Upon histological examination, it was diagnosed as a giant, pleomorphic liposarcoma. Thereafter, non-specific radiological and endoscopic results during clinical work-up delayed diagnosis until post-operative histology were gathered. In this report, the case-specific clinical and radiological diagnostic challenges are discussed, as well as the relevant surgical and pathological findings.

A Case Study in Extended Value Engineering

2002 ◽  
Author(s):  
R. Anderson ◽  
R. Sturges
Keyword(s):  
Process Improvement ◽  
Cost Reduction ◽  
Systematic Approach ◽  
Value Engineering ◽  
Cost Comparison ◽  
Mining Equipment ◽  
Analysis Process ◽  
Extended Value ◽  
Product And Process

Extended value engineering techniques provide an efficient, systematic approach to expose unnecessary costs, spur innovation, and direct efforts toward product and process improvement. Extended value engineering involves the comprehensive application of function diagramming, cost/cycle analysis, process diagramming, and competitive cost comparison. The application of these techniques to a mining equipment manufacturer, specifically to an ore haulage vehicle, is described in terms of cost reduction and manufacturing process improvement.

scholarly journals Collecting Microplastics in Gardens: Case Study (i) of Soil

2021 ◽  
Vol 9 ◽  
Author(s):  
Zahra Sobhani ◽  
Yunlong Luo ◽  
Christopher T. Gibson ◽  
Youhong Tang ◽  
Ravi Naidu ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Point Of View ◽  
Signal To Noise ◽  
Statistical Point ◽  
Image Mapping ◽  
Noise Ratio ◽  
In The Beginning ◽  
Raman Image ◽  
Selection Of

As an emerging contaminant, microplastic is receiving increasing attention. However, the contamination source is not fully known, and new sources are still being identified. Herewith, we report that microplastics can be found in our gardens, either due to the wrongdoing of leaving plastic bubble wraps to be mixed with mulches or due to the use of plastic landscape fabrics in the mulch bed. In the beginning, they were of large sizes, such as > 5 mm. However, after 7 years in the garden, owing to natural degradation, weathering, or abrasion, microplastics are released. We categorize the plastic fragments into different groups, 5 mm–0.75 mm, 0.75 mm–100 μm, and 100–0.8 μm, using filters such as kitchenware, meaning we can collect microplastics in our gardens by ourselves. We then characterized the plastics using Raman image mapping and a logic-based algorithm to increase the signal-to-noise ratio and the image certainty. This is because the signal-to-noise ratio from a single Raman spectrum, or even from an individual peak, is significantly less than that from a spectrum matrix of Raman mapping (such as 1 vs. 50 × 50) that contains 2,500 spectra, from the statistical point of view. From the 10 g soil we sampled, we could detect the microplastics, including large (5 mm–100 μm) fragments and small (<100 μm) ones, suggesting the degradation fate of plastics in the gardens. Overall, these results warn us that we must be careful when we do gardening, including selection of plastic items for gardens.

Capturing toleration on social networks sites using internet-mediated research: June 30th Egyptian revolution case study

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Noha A. Nagy ◽  
Amira S.N. Tawadros ◽  
Amal S. Soliman
Keyword(s):  
Content Analysis ◽  
Design Methodology ◽  
Web Content ◽  
Validity And Reliability ◽  
Social Phenomena ◽  
Egyptian Revolution ◽  
Content Type ◽  
Analysis Process ◽  
Egyptian Culture

Purpose This paper aims at understanding the dynamics underlying toleration as a complex social phenomenon and its pattern on Facebook during the June 30th revolution in Egypt. Thanks to the huge advances in ICT, internet-mediated research (IMR) has become one of the most prominent research methodologies in social sciences. Discussions on social network sites cannot be neglected in studying the dynamics complex and emerging social phenomena such as changes in public opinion, culture, attitudes and virtues. Design/methodology/approach To fulfill this aim, the researchers used web content analysis as a method inside IMR paradigm to analyze the discussions on Tamarrod’s Facebook page in the period from June 30th to July 5th and to examine the emerging overall pattern of toleration. Findings The results show indications that toleration is inherent in the Egyptian culture, and that the Egyptian society still keeps its reputation as a highly tolerant society, even in crises periods where tensions are witnessed everywhere. Moreover, the results also show that the web content analysis process proposed in this study is highly reliable and valid. Originality/value The importance of the study lies in introducing a computational and empirical approach to analyze web content in a semi-automated way and proving its validity and reliability to study social phenomena such as toleration.

scholarly journals Secondary teachers' perspectives on sustaining growth mindset concepts in instruction

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Maria Jorif ◽  
Cheryl Burleigh
Keyword(s):  
Instructional Practices ◽  
Growth Mindset ◽  
Structured Interviews ◽  
Content Type ◽  
Analysis Process ◽  
Learning Tasks ◽  
Depth Analysis ◽  
Secondary Grades ◽  
Teachers Perspectives

PurposeThe purpose of this paper is to explore perspectives of secondary (9–12) teachers on how to sustain growth mindset concepts within instructional practices as well as identifying barriers to sustainment.Design/methodology/approachThis study employed an exploratory case study to obtain the lived experiences of participants. An inductive analysis process was utilized on the data collected through structured interviews and a semi-structured focus group.FindingsFour major themes emerged from an in-depth analysis process: embed growth mindset practices in daily classroom instruction, communicate verbal affirmations and implement growth mindset learning tasks, allow students to experience academic successes and failures and teachers should receive continual support.Research limitations/implicationsThe study was limited to secondary grades (9–12). Therefore, it is recommended to expand the study to grades K-8.Originality/valueDue to a gap in the literature, this study provided insights into sustaining an innovative psychological approach, growth mindset, within academic instruction. Growth mindset concepts have been supported through the work of seminal researcher Carol Dweck and other prevalent educational researchers (e.g. Robert Marzano) to provide teachers with effective classroom instructional practices that can academically progress students.

Root Cause Analysis of Glovebox Glove Failure

2007 ◽  
Author(s):  
Y. H. Park ◽  
Michael Cournoyer
Keyword(s):  
Safety Concern ◽  
National Laboratory ◽  
Root Cause Analysis ◽  
Nuclear Materials ◽  
Alamos National Laboratory ◽  
Cause Analysis ◽  
Los Alamos National Laboratory ◽  
Root Cause ◽  
Analysis Process

The Nuclear Materials Technology (NMT) Division has the largest inventory of glovebox gloves at Los Alamos National Laboratory (LANL). Consequently, the minimization of unplanned breaches of the glove material, typically resulting in glove failures, is a significant safety concern in the daily operations in NMT Division facilities. To investigate processes and procedures that minimize unplanned breaches in the glovebox, information on glovebox glove failures has been compiled from formal records and analyzed using statistical methods. Based on these research results, the next step of the research is to identify root causes of glove failures and the actions adequate to prevent recurrence. In this paper, root cause analysis was conducted for a cleanup breach case study to demonstrate the computerized root cause analysis process. Based on analysis results, effective recommendations were generated.

VafusQ: A methodology to build visual analysis applications with data quality features

2018 ◽  
Vol 18 (4) ◽  
pp. 384-404
Author(s):  
Jhon Alejandro Triana ◽  
Dirk Zeckzer ◽  
Hans Hagen ◽  
Jose Tiberio Hernandez
Keyword(s):  
Data Quality ◽  
Visual Analysis ◽  
New Technologies ◽  
The Public ◽  
Interactive Applications ◽  
Public Transport System ◽  
Analysis Process ◽  
Interactive Visualizations ◽  
Quality Features

The use of interactive applications to support the decision-making process is more common every day. However, a huge amount of data is required in order to make more informed decisions. Fortunately, with the arrival of new technologies there are many data sources available. This requirement of data causes heterogeneity and data quality problems. A set of data quality problems are reduced in the preprocessing stage. However, many data quality issues persist after the preprocessing stage. For this reason, we proposed a methodology to take the data quality problems, to represent them and simultaneously support the analysis process. In addition, an application is developed as a use case of the methodology by analyzing the public transport system in Bogotá. Furthermore, a case study is performed to test the usefulness of the developed application. As a result, the methodology made possible the development of interactive visualizations that constitute an application that is useful to achieve the analysis tasks by including data quality features.

Uncertainties in GPS-based operational orbit determination: A case study of the Sentinel-1 and Sentinel-2 satellites

2020 ◽  
Vol 124 (1276) ◽  
pp. 888-901 ◽  
Author(s):  
P. Kuchynka ◽  
M.A. Martin Serrano ◽  
K. Merz ◽  
J. Siminski
Keyword(s):  
Orbit Determination ◽  
State Vector ◽  
Signal To Noise Ratio ◽  
Precise Orbit Determination ◽  
Space Operations ◽  
Gps Navigation ◽  
Least Squares Fit ◽  
Observation Programme ◽  
Sentinel 2

ABSTRACTThe European Space Operations Centre currently operates five Copernicus Sentinel satellites in the framework of Europe’s Copernicus Earth observation programme. The routine operations rely on a daily orbit determination, carried out on-ground, consisting in a least-squares fit of a dynamical model to GPS navigation solutions generated on-board. The purpose of this paper is the estimation of realistic uncertainties on this daily determined state vector. By comparison with the orbit derived by Precise Orbit Determination, we estimate the 1-sigma errors at approximately 0.5m and 0.5mm/s. Non-stationary errors in the navigation solution preclude their characterisation with a constant covariance matrix. Error whitening is achieved by decreasing the signal-to-noise ratio in the errors through the use of underestimated weights on the data. The approach keeps the errors on the derived state vector unchanged and allows the covariance on the state vector to become realistic.

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