4. A robot performs a loading and unloading operation for a machine tool. Currently the robot can't be integrated with human workers due to safety concerns the robot work cycle consists of the following sequence of activities Every 90 work parts, the cutting tools in the machine must be changed. This irregular cycle takes 9.0min to accomplish. The uptime efficiency of the robot is 98%; and the uptime efficiency of the machine tool is 97%, not including interruptions for tool changes. These two efficiencies are assumed not to overlap (i.e., if the robot breaks down, the cell will cease to operate, so the machine tool will not have the opportunity to break down; and vice versa). Downtime results from electrical and mechanical malfunctions of the robot, machine tool, and fixture. Determine 4.1. The company wants to improve the safety of the robot for better integration with human workers. As an industrial engineer apply at least 3 sensors that can be applied to arehive the goal. [5] 4.2.Apply 1 specific advance function that will improve the overall functioning of the robot 4.3.The hourly production rate, taking into account the lost time due to tool changes and the uptime efficiency. [15] 4.4.The company is also looking in to purchasing forklift truck to support the robot process, determine the number of forklift requires to make 50 deliveries/hour with the following requirements The average travel distance per delivery will be 500m loaded an the average empty travel distance will be 400m. Load and unload times are each 0.75min and the speed of the vehicles =350m/min. Assume the traffic factor for the system =0.85, availability =0.95, and worker efficiency =90%. [10]