High Protein, Core Muscle Rehab, Muscular Electrostimulation in Prolonged Mechanical Ventilation

The investigator aims to investigate the efficacy of below list methods in patients with prolong mechanical ventilator: * High protein formula intake benefit in successful weaning from ventilator * Core muscle rehabilitation benefit in successful weaning from ventilator * neuromuscular electric stimulation benefit in successful weaning from ventilator Participants will randomly stratify into four groups: (1) Usual care (UC), (2) UC + high protein diet (HP), (3) UC + HP + core muscle rehabilitation, (4) UC + HP + core muscle rehabilitation + neuromuscular electric stimulation (NMES). Researchers will compare group 2,3,4 to control group (1, usual care) to see if high protein diet, core muscle rehabilitation, neuromuscular electric stimulation works.