The phrase "problems existing in" is correct and usable in written English.
You can use it when you are referring to difficulties that are present in a particular area or situation. Example: There are many problems existing in the educational system that need to be addressed.
"Don't fantasize that privatization can resolve all the problems existing in industry monopolies," said the article in Qiushi, which means "seeking truth".
"The crisis has put China's dairy industry in peril and exposed major problems existing in the quality control and supervision of the industry," an official with China's National Development and Reform Commission said in a posting on the agency's Web site.
However, physical and technical problems existing in this technology are complicated.
Problems existing in current one-way delay estimation schemes are investigated in this paper.
Before we can generate quadrilaterals from these interceptions, we need to address two problems existing in the preliminary set.
Multi-antenna and smart antenna techniques are widely used to solve the problems existing in high-speed railway [3].
Tom Rasberry (whose name is one letter short of the red fruit) faced this particular ant menace in Pasadena, Texas, back in 2002, and learned that the pesky things had no problem existing in an ant apocalypse of sorts: Rasberry said he treated a half-acre plot with insecticide, returning months later to find the area covered thickly with two inches of dead ants.
For this purpose, we have chosen the error correcting codes optimization problem, a problem existing in the communication systems.
However, one problem existing in this method is that the oil produced may have a mass loss during the drying process.
In addition, the proposal has totally eliminated the silhouette problem existing in the previous IBE schemes, and its effectiveness and feasibility have been demonstrated by numerical simulations.
The algorithm of this proposal is specially designed for single-beam optical decryption and can thoroughly resolve the silhouette problem existing in the previous interference-based scheme.
