A challenging application of control design is the use of nano robots in medicine. Nano robots will require onboard computing capability, and very tiny sensors and actuators. Fortunately, advances in bio-molecular computing, bio-sensors, and actuators are promising to enable medical nano robots to emerge within the next decade [98]. Many interesting medical applications will benefit from nano robotics. For example, one use might be to use the robotic devices to precisely deliver anti-HlV drugs or to combat cancer by targeted delivering of chemotherapy. At the present time, we cannot construct practical nano robots, but we can consider the control design process that would enable the eventual development and installation of these tiny devices in the medical field. Consider the problem of designing a nano robot to deliver a cancer drug to a specific location within the human body. The target site might be the location of a tumor, for example. Using the control design process illustrated in Figure 1.15, suggest one or more control goals that might guide the design process. Recommend the variables that should be controlled and provide a list of reasonable specifications for those variables.

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FIGURE DP1.7 An artist illustration of a nanorobot interacting with human hload cells