Electronic nose 12 electronic nose 9 History of engineering and technology 8 Research & information: general 5 Technology: general issues 5 Machine learning 4 Pattern recognition 4 Quality control 4 machine learning 4 pattern recognition 4 Artificial olfaction 3 Chemistry 3 Internet of things 3 Principal component analysis 3 Support vector machines 3 6G-IoT 2 6g-IoT 2 Acetone 2 Apple quality grading 2 Aquaphotomics 2 Benchmarking 2 Biology, life sciences 2 Colony Count, Microbial 2 Computational fluid dynamics 2 Computational fluid dynamics simulations 2 Constrained optimization 2 Convolution 2 Convolutional neural network 2 Data handling 2 Decision trees 2