What is the best way to encode categorical variables in datasets with many features and avoid increasing dimensionality of the dataset?

I am working with a large dataset that has many categorical variables with many classes in each variable. I want to encode the categorical variables without increasing the dimensionality of the...

31 January 2021 6,986 3 View

If you have the authority to distribute COVID-19 vaccine to which age group or career would you begin with?

Would they be an A: elderly B: women want to be pregnant, C: health care workers, D: immune compromised E: military servants, F: or others? Please specify

14 December 2020 1,108 61 View

How to test an automatically annotated dataset for sentiment analysis?

Dear all, I have annotated a dataset of 7200 tweets with three sentiment classes: positive, negative and neutral. After training and testing multiple classification models with 6000 training +...

17 October 2020 8,501 3 View

Does electromagnetic fields harmful to our bodies?

Does magnetic field can heat the human body? According to the International Commission on Non-Ionizing Radiation protection (ICNIRP), there is a maximum allowable magnetic field exposure to our...

14 October 2020 7,594 3 View

I would like to ask how can i get adiponectin as drug to increase insulin sensitivity in obese people ?

Adiponectin as a drug

23 January 2020 8,571 1 View

Why some journals do not have an impact factor?

I have read many topics to understand the impact factor of journal. The confusion is how some journals, for example in Springer, do not have an impact factor? From discussion in this website and...

02 March 2019 8,220 3 View

Is there any articles or papers regarding Agricultural Extension Specialist?

Agricultural extension specialist topics regarding agricultural and veterinary sciences.

31 December 2018 9,622 12 View

What kind of task can be performed with "Twitter News Corpus"?

I have collected above 2.5 millions of news headlines from the newswires in Arabic (BBC, CNN, Aljazeera, AlArabyia, ....etc.) posted on twitter from 2008-now. I am asking about what kind of task...

04 May 2018 9,606 5 View

How to assign polarity for words in sentiment lexicon?

I have read many papers explaining how to assign polarity to each word in the lexicon of positive and negative terms. Some of them such as SentiWordNet assigned 3 polarity scores(Positive,...

02 March 2018 3,977 5 View

How to perform sentiment analysis for Arabic text using a hybrid approach combined a dictionary of positive&negative words and machine learning algos?

I have built my own sentiment lexicon using word embeddings and know I am stuck in how to add more features in order of train my machine learning algorithms. Please help... Thanks

02 March 2018 5,767 4 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

How to prepare a thin polymer film by post-polymerization/crosslinking?

24 February 2021 2,362 5 View

Is is possible to pole with corona poling pellets of the sample material instead of thin films?

As it is highly probable that pellets will have a higher degree of air gaps and voids than thin films, is it possible to pole the samples with corona poling nevertheless? Or is there the...

24 February 2021 1,349 1 View

How to troubleshoot Electrochromic Films and Electrochromic Devices?

I am trying to characterize an electrochromic system. The system uses ITO electrodes on glass, WO3 as the electrochromic film, and NiO as the ion storage layer. When I deposit NiO and WO3 and...

23 February 2021 9,592 2 View

How to improve the adhesion between germanium and silicon monoxide thin film layers using EBEAM evaporation?

I want to deposit multilayer coating of germanium and silicon monoxide on silicon wafer using ebeam evaporation?

21 February 2021 2,141 3 View

How can I measure the thickness of thin layers deposited on textured glass susbtrates?

I want to measure the thickness of aluminum oxide and titanium oxide layers deposited on textured glass substates. The layer thicknesses are typically below 100nm.

21 February 2021 5,465 4 View

How do I calculate absorption coefficient of my thin film if I dont know the thickness? Or how can I calculate the thickness of my sample?

I have done Uv-vis characterisation of my thin film and have received absorbance and transmittance data. Now I want to calculate the absorption coefficient but I dont know the thickness of my...

21 February 2021 7,148 8 View

How to construct different filler shape in MD simulations?

Is there any way to construct different initial filler shapes like triangle, square, rectangle, pillar, and tube in any simulation software.

20 February 2021 1,750 1 View

Can fractal dimension of thin film surfaces affects the electrons energy states?

As fractal dimension of a thin film surface implies the irregularity in the surface. Is it possible that the energy states of the electrons are also affected by the fractal dimension?

19 February 2021 5,509 3 View

What is the reason film thickness increased?

what is the reason film thickness increased when increased doping concentrations give some reasons The measured film thickness is 156, 282, 394, 548 and 681 nm for 0, 1.5, 2.5, 3.5, and 4.5 wt....

17 February 2021 8,987 5 View