Is yelling at and shaming an employee ever justifiable?

Imagine that a product at work must be shipped by a certain deadline -- and if it's late, the company will suffer a major loss. All the workers involved know that, yet as the deadline approaches, one worker works slowly, seemingly without concern for the deadline. When reminded, he acknowledges the deadline, yet his work continues to be as slow as ever. In such cases, might yelling at that worker -- even shaming him in front of co-workers -- be just what he needs to motivate him to get the project done? If not, what else should be done?