Withdrawal from opioids such as oxycodone causes physical symptoms similar to the flu. Withdrawal also causes psychological symptoms whose demoralizing affects can be just as overpowering as the physical symptoms of withdrawal.
A director is a person from a group of managers who leads or supervises a particular area of a company, program, or project. Companies that use this term often have many directors spread throughout different business functions or roles (e.g. director of human resources).
However, the employer, or the chief executive, in any particular business usually determines the extent of the operations chief's oversight, no matter what title a company applies to the role. Larger companies usually refer to a director of operations as a COO. In either case, the job is usually an executive position, but the duties for the job vary widely. Such a position may be created, or eliminated, to fit the needs of a company as it grows or downsizes.