Demystifying die protection--Sensors and controls: eyes and brain of die protection

摘要

Technology is rapidly changing lives and how people live. Most days they leave the house and go to work without noticing that anything differs that day from the day before or even the week before. But every day the world changes. It may be gradual and subtle, but change is constant and unstoppable. One of the best examples of this is the evolution of cell phones. These days everyone has a cell phone and many people have more than one. The first hand-held phones on the market were bulky and had a short battery life. Service was restricted to major cities and highways. Cell phones evolved and now can be used as movie cameras, to access the Internet, send text messages, do daily planning, alert with alarms- and the list goes on and on.