scholarly journals Two-stage technology of automated terminology extraction based on topic modeling and context analysis

2021 ◽  
Vol 12 (5-2021) ◽  
pp. 10-21
Author(s):  
Maksim G. Shishaev ◽  
◽  
Vladimir V. Dikovitsky ◽  
Pavel A. Lomov ◽  
◽  
...  
Keyword(s):  
Experimental Verification ◽  
Topic Modeling ◽  
Two Stage ◽  
Context Analysis ◽  
Terminology Extraction ◽  
Further Development

The paper deals with the task of automated terminology extraction. A two-stage technology for its solution is proposed, based on topic modeling and analyzing the context of the use of lexical units. The results of experimental verification of the technology and the prospects for its further development are presented.

Analysis and Visualization Latent Topic on COVID-19 Vaccine Tweet use two-stage topic modeling (Preprint)

2021 ◽  
Author(s):  
Faizah Faizah ◽  
Bor-Shen Lin
Keyword(s):  
Topic Modeling ◽  
Public Perception ◽  
Latent Dirichlet Allocation ◽  
World Health ◽  
Two Stage ◽  
The Public ◽  
Global Pandemic ◽  
Difficult Time ◽  
Latent Topic ◽  
Latent Topics

BACKGROUND The World Health Organization (WHO) declared COVID-19 as a global pandemic on January 30, 2020. However, the pandemic has not been over yet. Furthermore, in the first quartal of 2021, some countries face the third wave of the pandemic. During the difficult time, the development of the vaccines for COVID-19 accelerates rapidly. Understanding the public perception of the COVID-19 Vaccine according to the data collected from social media can widen the perspective on the state of the global pandemic OBJECTIVE This study explores and analyzes the latent topic on COVID-19 Vaccine Tweet posted by individuals from various countries by using two-stage topic modeling. METHODS A two-stage analysis in topic modeling was proposed to investigating people’s reactions in five countries. The first stage is Latent Dirichlet Allocation that produces the latent topics with the corresponding term distributions that facilitate the investigators to understand the main issues or opinions. The second stage then performs agglomerative clustering on the latent topics based on Hellinger distance, which merges close topics hierarchically into topic clusters to visualize those topics in either tree or graph views. RESULTS In general, the topic discussion regarding the COVID-19 Vaccine in five countries is similar. Topic themes such as "first vaccine" and & "vaccine effect" dominate the public discussion. The remarkable point is that people in some countries have some topic themes, such as "politician opinion" and " stay home" in Canada, "emergency" in India, and & "blood clots" in the United Kingdom. The analysis also shows the most popular COVID-19 Vaccine, which is gaining more public interest. CONCLUSIONS With LDA and Hierarchical clustering, two-stage topic modeling is powerful for visualizing the latent topics and understanding the public perception regarding the COVID-19 Vaccine.

scholarly journals A study on conceptual associations of colors in preschool children

2019 ◽  
Vol 9 (3) ◽  
pp. 729-764
Author(s):  
Özge Mazlum ◽  
Fehmi Soner Mazlum
Keyword(s):  
Preschool Children ◽  
Working Group ◽  
Sampling Method ◽  
Learning Activities ◽  
Preliminary Review ◽  
Two Stage ◽  
Context Analysis ◽  
Purposive Sampling ◽  
Analysis Technique ◽  
Descriptive Survey

In this study, the conceptual associations of colors in preschool children were examined with an interdisciplinary perspective. Designed as a preliminary review, this study provides insights and suggestions about how conceptual associations of colors can be used for developing products and services for kids and improving the effectiveness of learning activities in education. This study was designed as descriptive survey because it describes an existing situation. This research’s working group was chosen through a purposive sampling method. The study also includes interpreted components. Two-stage interviews were made with 204 children aged between 60 and 72 months in pre-school education in Ankara with active participation of their form teachers, and the data were collected using the context analysis technique. The study found that children show dominant preference for certain colors in connection with certain concepts and they made consistent spectrum preference for certain concepts. These preferences indicate that the children aged between 60 and 72 months are able to make associations between concepts and colors and attribute meanings to colors in the background, with important hints for the use of colors in designing products and planning learning activities for children.

scholarly journals Evaluation of the standard procedure for the treatment of periprosthetic joint infections (PJI) in Germany - Results of a survey within the EndoCert initiative

2020 ◽  
Author(s):  
Christina Rimke ◽  
Andreas Enz ◽  
Hermann Josef Bail ◽  
Peter Heppt ◽  
Bernd Kladny ◽  
...  
Keyword(s):  
Treatment Guidelines ◽  
Standard Procedure ◽  
Joint Infection ◽  
Treatment Options ◽  
Two Stage ◽  
Joint Replacements ◽  
Joint Infections ◽  
Standardized Treatment ◽  
Principles Of Treatment ◽  
Further Development

Abstract Background: The periprosthetic joint infection (PJI) is a severe complication in the field of arthroplasty. Despite the rising number of primary joint replacements, no unified therapeutic standard has been established for the treatment of PJI yet.Methods: A survey on the principles of treatment of PJI in Germany wasconducted. A total of 515 EndoProthetikZentren (EPZ) were included, resulting in a response rate of 100%.Results: For early infections 97.6% of the centers use prosthesis-preserving procedures (DAIR). A one-stage exchange was implemented by less than 50% of the centers. If implemented, this treatment entails a prior selection of patients for a successful treatment. The two-stage exchange is performed in all centers, and most centers proceed with the implantation of a cemented spacer between stages. 75% of the centers proceed with a center-based concept for the treatment of PJI.Conclusion: The aim of a uniform PJI standard at the centers has not yet been fully achieved. Further improvements within the certification were initiated. The most relevant treatment options in Germany are displayed. The two-stage revision with a cemented spacer is the most widely implemented treatment. This exposition of principles could help for the further development of standardized treatment guidelines and definitions.

NOx Emissions From Industrial Boilers: Potential Control Methods

1974 ◽  
Vol 96 (1) ◽  
pp. 1-6 ◽  
Author(s):  
C. W. Siegmund ◽  
D. W. Turner
Keyword(s):  
Flue Gas ◽  
Two Stage ◽  
Potential Control ◽  
Excess Air ◽  
Stage Combustion ◽  
Utility Boilers ◽  
Industrial Boilers ◽  
Potential Methods ◽  
Further Development ◽  
Methods Of Control

Future regulations may limit emissions of NOx from industrial/commercial boilers as well as utility boilers. The potential methods of control for these boilers are the same as those for utility boilers—low excess air, flue gas recycle, and two stage combustion. Low excess air and flue gas recycle can control NOx from thermal fixation. Two stage combustion controls both thermal and fuel NOx. Further development work is needed to apply these combustion modification procedures to industrial/commercial boilers in which volumetric heat release rate is normally quite high.

scholarly journals Trends in the development of turbocharging systems in automotive vehicles

2008 ◽  
Vol 133 (2) ◽  
pp. 61-76
Author(s):  
Krzysztof DANILECKI
Keyword(s):  
Single Stage ◽  
Compression Ignition ◽  
Two Stage ◽  
Compression Ignition Engines ◽  
Further Development

The application of turbocharging systems results in serious problems related to the delivery of appropriate amount of air needed to entirely burn the supplied dose of fuel. This problem is particularly relevant for non-adjustable turbocharging systems (constant geometry turbines). The improvements of the turbocharging systems in compression ignition engines may be implemented through such solutions as two stage or sequential turbocharging that show significant benefits as opposed to a single stage variable turbocharger geometry (VGT) turbocharging. The paper presents adjustable two stage turbocharging and sequential turbocharging finding application in serially manufactured vehicles. The assessment of the properties of these solutions and attempts to describe the trends in the further development of the turbocharging systems have been made. With this background, the results of own research of the author have been presented performed on a SW 680 sequentially turbocharged engine.

scholarly journals Evaluation of the standard procedure for the treatment of periprosthetic joint infections (PJI) in Germany - results of a survey within the EndoCert initiative

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Christina Rimke ◽  
Andreas Enz ◽  
Hermann Josef Bail ◽  
Peter Heppt ◽  
Bernd Kladny ◽  
...  
Keyword(s):  
Treatment Guidelines ◽  
Standard Procedure ◽  
Joint Infection ◽  
Treatment Options ◽  
Two Stage ◽  
Joint Replacements ◽  
Joint Infections ◽  
Standardized Treatment ◽  
Principles Of Treatment ◽  
Further Development

Abstract Background The periprosthetic joint infection (PJI) is a severe complication in the field of arthroplasty. Despite the rising number of primary joint replacements, no unified therapeutic standard has been established for the treatment of PJI yet. Methods A survey on the principles of treatment of PJI in Germany was conducted. A total of 515 EndoProthetikZentren (EPZ) were included, resulting in a response rate of 100%. Results For early infections 97.6% of the centers use prosthesis-preserving procedures (DAIR). A one-stage exchange was implemented by less than 50% of the centers. If implemented, this treatment entails a prior selection of patients for a successful treatment. The two-stage exchange is performed in all centers, and most centers proceed with the implantation of a cemented spacer between stages. 75% of the centers proceed with a center-based concept for the treatment of PJI. Conclusion The aim of a uniform PJI standard at the centers has not yet been fully achieved. Further improvements within the certification were initiated. The most relevant treatment options in Germany are displayed. The two-stage revision with a cemented spacer is the most widely implemented treatment. This exposition of principles could help for the further development of standardized treatment guidelines and definitions.

scholarly journals Supervised Latent Dirichlet Allocation with Covariates: A Bayesian Structural and Measurement Model of Text and Covariates

2021 ◽  
Author(s):  
Kenneth Tyler Wilcox ◽  
Ross Jacobucci ◽  
Zhiyong Zhang ◽  
Brooke A. Ammerman
Keyword(s):  
Latent Variables ◽  
Topic Modeling ◽  
Latent Variable ◽  
Latent Dirichlet Allocation ◽  
R Package ◽  
Measurement Model ◽  
Psychological Research ◽  
Two Stage ◽  
Modeling Approaches ◽  
Dirichlet Allocation

Text is a burgeoning data source for psychological researchers, but little methodological research has focused on adapting popular modeling approaches for text to the context of psychological research. One popular measurement model for text, topic modeling, uses a latent mixture model to represent topics underlying a body of documents. Recently, psychologists have studied relationships between these topics and other psychological measures by using estimates of the topics as regression predictors along with other manifest variables. While similar two-stage approaches involving estimated latent variables are known to yield biased estimates and incorrect standard errors, two-stage topic modeling approaches have received limited statistical study and, as we show, are subject to the same problems. To address these problems, we proposed a novel statistical model --- supervised latent Dirichlet allocation with covariates (SLDAX) --- that jointly incorporates a latent variable measurement model of text and a structural regression model to allow the latent topics and other manifest variables to serve as predictors of an outcome. Using a simulation study with data characteristics consistent with psychological text data, we found that SLDAX estimates were generally more accurate and more efficient. To illustrate the application of SLDAX and a two-stage approach, we provide an empirical clinical application to compare the application of both the two-stage and SLDAX approaches. Finally, we implemented the SLDAX model in an open-source R package to facilitate its use and further study.

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