The phrase "already existing implementation" is correct and usable in written English.
It can be used when referring to a system, method, or process that has been developed and is currently in use.
Example: "Before we create a new solution, we should evaluate the already existing implementation to identify any potential improvements."
Alternatives: "current implementation" or "existing solution".
For the structural-based features, we adapted an already existing implementation of Naccess (Hubbard and Thornton, 1993) and DSSP (Kabsch and Sander, 1983) to calculate exposed residue surface area and for assigning secondary structure, respectively.
Besides reporting the factors influencing the pathway implementation and giving practical implications how to improve pathway implementation, we proposed a theoretical framework by arranging the findings in a multidimensional model and thereby add innovative aspects to the already existing implementation research.
This new approach exhibits some interesting advantages compared to already existing methods (implementation, performance flexibility, robustness etc).
Already existing system implementations and system approaches can be assigned to exactly one level.
While parser generators allow the extensible or even incremental [22] generation of parsers, they lack the ability of integrating and composing already existing parser implementations.
Sadly Python doesn't have this functionality in the default libraries so I went looking for an existing implementation.
(TODO: sidebar) Some notes on implementation details: The existing implementation uses this data structure for the signing context.
Contrary to the GP-GPU programming accelerating many scientific codes, the standard x86 architecture of the Xeon Phi processors allows to reuse the already existing multi-core implementation.
Having reviewed already existing packages for the implementation of BCIs, we introduce our own solution which specifically considers the relevance of multi-subject handling for experimental and clinical trials, for example by implementing ready-to-use solutions for pseudo-/sham-neurofeedback.
Furthermore, since implementations for NoSQL databases were already existing, we simply reused the client implementation for MongoDB for obtaining our baseline measurements.
In order to simplify the development and implementation task, already existing command line tools were selected to carry out all interaction with the used storage services.
