Our current Editors' Choice for home automation hubs, the Wink Hub 2 works with devices that use Z-Wave, Zigbee, Lutron Clear Connect, Kidde, Bluetooth, and Wi-Fi. It is also for the future. That includes just about everything in the smart home spectrum, from Philips Hue lighting and the Netgear Arlo camera, to Google Home. It's the most reliable, widely supported hub we've tested.
Each new development in the history of powered machines has brought with it an increased requirement for control devices to harness the power of the machine. The earliest steam engines required a person to open and close the valves, first to admit steam into the piston chamber and then to exhaust it. Later a slide valve mechanism was devised to automatically accomplish these functions. The only need of the human operator was then to regulate the amount of steam that controlled the engine’s speed and power. This requirement for human attention in the operation of the steam engine was eliminated by the flying-ball governor. Invented by James Watt in England, this device consisted of a weighted ball on a hinged arm, mechanically coupled to the output shaft of the engine. As the rotational speed of the shaft increased, centrifugal force caused the weighted ball to be moved outward. This motion controlled a valve that reduced the steam being fed to the engine, thus slowing the engine. The flying-ball governor remains an elegant early example of a negative feedback control system, in which the increasing output of the system is used to decrease the activity of the system.
Cohn refers to the middle layer of the pyramid as the service layer, but it's also known as the layer for automated API tests, automated component tests, or acceptance tests. You use this automation layer to test the business logic without involving the user interface (UI). By testing outside the UI, you can test the inputs and outputs of the APIs or services without all the complications the UI introduces.
Business process automation (BPA), also known as business automation or digital transformation, is the technology-enabled automation of complex business processes. It can streamline a business for simplicity, achieve digital transformation, increase service quality, improve service delivery or contain costs. It consists of integrating applications, restructuring labor resources and using software applications throughout the organization. Robotic process automation is an emerging field within BPA and uses artificial intelligence.