The phrase "are frequently needed" is correct and usable in written English.
It can be used when discussing items, resources, or skills that are often required or necessary in a particular context.
Example: "In our line of work, certain technical skills are frequently needed to ensure project success."
Alternatives: "are often required" or "are commonly necessary."
Nonsteroidal anti-inflammatory drugs (NSAIDs) are frequently needed for the treatment of patients with arthritis.
Railway ballast degradation under dynamic loads progressively leads to loss of mechanical performance and geometry of the track, so that maintenance interventions are frequently needed.
DHR evaluations are frequently needed in both ambulatory and hospital settings and have a complex diagnosis that requires a detailed clinical history and other tests that may include in vitro tests and in vivo procedures such as skin tests and drug provocation tests.
The architectural template consists of a versatile on-chip interconnect with asynchronous FIFOs and bitwidth conversion placed into the communication links, a performance monitoring infrastructure for collecting performance information during runtime and a set of generic infrastructure cores which are frequently needed in accelerator designs.
They are frequently needed to stabilize soils but they may compete with woody regeneration.
For example, one can move "hot" columns (the ones which are frequently needed) first, if the halt of relocation can happen.
To satisfy present or emerging energy demands, the expansion of transmission networks is frequently needed.
Network matching is frequently needed for integrating data that come from different sources.
Welding at low atmospheric temperatures is frequently needed for the construction of steel structures in cold regions.
After all, it has a shelf life of only 42 days, must be kept refrigerated, and is frequently needed on an urgent basis.
Such image processing is frequently needed to separate the inherent surface microstructure from the global topography related to sample tilt or surface waviness.
