In order to improve the prediction accuracy of gas emission in the mining face, a method combining least absolute value convergence and selection operator (LASSO), whale optimization algorithm (WOA), and extreme Stable Accessories gradient boosting (XGBoost) was proposed, along with the LASSO-WOA-XGBoost gas emission prediction model.Aiming at the
Ambiguity resolution (AR) is critical for achieving a fast, high-precision solution in precise point positioning (PPP).In the standard uncombined PPP (S-UPPP) method, ionosphere-free code biases are Net superimposed by ambiguity and receiver clock offsets to be estimated.However, besides the time-constant part of the receiver code bias, the complex
The volatility of tourism demand is often caused by some irregular events in recent years.Typically, inbound tourists are quite sensitive to various factors, including the exchange rate fluctuation, consumer price index, personal or household income or consumption expenditure.We combine these multivariate time series data GUM CHOCOLATE MINT onto an
A systematic study has been carried out to assess the underground water contamination and the effect of textile effluents on Noyyal River basin in and around Tiruppur Town.Twenty six sampling locations were selected at random and the ground water samples were collected mostly from tube wells at Noyyal River basin in and around Tiruppur area.The sam
Reputation systems are an important means to facilitate trustworthy interactions between on-and off-chain services and users.However, contemporary reputation systems are typically dependent on a trusted central authority to preserve privacy of raters or on adding noise into the user feedback.Moreover, the accuracy of reputation values relies on the