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Private information retrieval is an important application of homomorphic encryption. As a hot topic in recent years, homomorphic encryption scheme can operate on the ciphertext and the decryption result is equal to the same operation on the plaintext. Trivial PIR protocol faces the plaintext retrieval, so it could not guarantee the database privacy. In the cloud environment, it is unsafe to store...
In this paper we explore the effectiveness of ensemble learning in the failure prognosis field by MLP neural network. An effective ensemble should consist of a set of learners that are both accurate and diverse. In the training stage, we use the Adaboost. R2 technique to train several weak learners (multi layer perceptron network-MLP) to increase the diversity of the individual models. In the prediction...
A high pressure and high temperature method was used to efficiently extract on a large scale metallofullerenes MΓ 2n (M=La,Ce) in a closed vessel under argon gas protection. With pyridine as the HPHT solvent, about 60-80% MΓ 2n and 30-55% MΓ 82 can be enriched, MΓ 82 is dissolved selectively; With toluene as the HPHT solvent, MΓ 2n ...
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