In this paper, the stochastic dynamical model of a single-degree-of-freedom milling operation is formulated, where Gaussian white noise process models high-frequency variation in cutting force. With help model, it shown, that large-amplitude stable vibrations can occur near critical machining parameters, due to noise-induced resonance. During analysis, second moment stability and stationary fir...

In this paper, we propose a method to compare and visualize spectrograms in a low dimensional space using manifold learning. This approach is divided in two steps: a data processing and dimensionality reduction stage and a feature extraction and a visualization stage. The procedure is applied on different types of data from a hot rolling process, with the aim to detect chatter. Results obtained...

The advent of smartphones has enormously expanded utilitarian capabilities of mobile computing and has provided many advanced capabilities to their users. We take advantage of the advanced interaction capabilities of smartphones to enable their user perform exploratory search with the goal of fostering inspiration. Our search application combines diversification of content and sources with a us...

In this paper a new 3 degree-of-freedom lumped-parameter model for machine tool vibrations is developed and analyzed. One mode is shown to be stable and decoupled from the other two, and thus the stability of the system can be determined by analyzing these two modes. It is shown that this mode-coupled nonconservative cutting tool model including the regenerative e¤ect (time delay) can produce a...

The recent volatility of cryptocurrencies has caused significant financial losses, leading many individuals to communicate their stress via social media platforms. On one such platform, Reddit, the increased suicide-related chatter prompted users post suicide help lines within forums (subreddits).

The proliferation of communication devices has brought into being a host of media, including the use of voice over telephones, text in e-mail and images in faxes. As people become more mobile, they will need portable devices to access information in a timely way, whether they are in the office or on the road. The telephone is a convenient and ubiquitous device which people already know how to u...