Abstract: Provided are a target retrieval method and device, and a storage medium.

Abstract: A pricing optimization system can solve a constrained optimization problem by generating one or more prices for one or more items that satisfy a maximum number of prioritized constraints. The one or more generated prices can be one or more prices that represent a minimal deviation between the generated one or more prices and one or more original prices for the one or more items. By satisfying a maximum number of prioritized constraints, and by minimizing a deviation from the one or more original prices for the one or more items, the generated one or more prices are one or more optimal prices.

Abstract: A pricing optimization system can solve a constrained optimization problem by generating one or more prices for one or more items that satisfy a maximum number of prioritized constraints. The one or more generated prices can be one or more prices that represent a minimal deviation between the generated one or more prices and one or more original prices for the one or more items. By satisfying a maximum number of prioritized constraints, and by minimizing a deviation from the one or more original prices for the one or more items, the generated one or more prices are one or more optimal prices.

Abstract: A transmission system includes a rotatable main gear, first and second transmission gears rotatably and movably disposed and respectively in constant mesh with the main gear, and first and second power output components rotatably disposed and in constant mesh with each other. The first and second transmission gears detachably mesh with the first and second power output components respectively. The main gear is rotated counterclockwise to drive the second transmission gear away from the second power output component, and to drive the first transmission gear to mesh with the first power output component to rotate the first and second power output components. The main gear is rotated clockwise to drive the first transmission gear away from the first power output component, and to drive the second transmission gear to mesh with the second power output component to rotate the second and first power output components.

Abstract: A simplex and duplex continuous automatic document feeder includes a sheet input tray in which a sheet is placed before the sheet is fed, a first sheet output tray in which the sheet, after being fed, is placed, an image processing region in which the sheet is processed, a sheet input passageway communicating the sheet input tray with the image processing region, a turning passageway having a front end and a rear end both communicating with the image processing region, a sheet output passageway communicating the image processing region with the first sheet output tray, and a sheet-feeding mechanism for transporting the sheet from the sheet input tray to the first sheet output tray across the image processing region.