Exact(1)
Although the GNU Project produced many useful system utilities, it had less success in developing a kernel, or central module of an operating system, that did not rely on any of the proprietary code from UNIX.
Similar(59)
Many useful systems are, in effect, modifications of previous designs.
With those sensors and log capability of smartphone, we can develop many useful systems or applications in different domains such as healthcare (elderly monitoring system [1, 2], human fall detection [3, 4]), transportation (monitoring road and traffic condition [5]), personal [6, 7] and social behavior [8, 9], environmental monitoring (pollution [10], weather) and etc.
Many useful manmade systems in this world are extremely complex; a typical example is a large infrastructure.
"This is further evidence that there are many useful CRISPR systems waiting to be discovered," said Jonathan Strecker, a postdoc in the Zhang Lab, a Human Frontiers Science program fellow, and the study's first author.
Many useful face detection systems use various basic theories [3 6].
There are many original ideas and useful system inputs embedded in the building of human settlements in Scandinavian regions, where the landscape and habitat are strongly interconnected.
Even though the nonlinear damping characteristics inherently pertain to most structural systems, many useful dynamic models are still linear.
Many useful properties of the polyurethane systems are greatly influenced by water absorption phenomena by polyurethane films.
So far, many useful results for positive switched systems have been obtained in the literature, particularly with respect to the stability analysis [13 16].
Facebook could use this information for many useful purposes — perhaps most immediately a bespoke emoji system.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com