Abstract: A reflow oven central monitoring method includes setting standard operating parameters of a reflow oven, acquiring real-time operating parameters of the reflow oven, and comparing the real-time operating parameters respectively to the standard operating parameters to determine whether a difference exceeds a predetermined range. If the difference exceeds the predetermined range, workpieces are stopped from flowing into the reflow oven, a position of abnormal workpieces is locked, an alarm signal is sent, a prompt of locking the position of the abnormal workpieces is sent, and at least one of the real-time operating parameters is provided for inspection of the abnormal workpieces. The standard operating parameters include a standard temperature of each reheating zone of the reflow oven, a conveying speed of the reflow oven, and an oxygen content. The real-time operating parameters respectively correspond to the standard operating parameters.

Abstract: A smart decision feedback method for inspecting a circuit board includes obtaining a number of abnormal solder paste points of a circuit board identified by a solder paste inspection device, determining whether the number of abnormal solder paste points is greater than or equal to a first predetermined value, determining whether an identification result of the solder paste inspection device is abnormal when the number of abnormal solder paste points is less than the first predetermined value, obtaining an inspection result performed by a testing device inspecting the circuit board when the identification result of the solder paste inspection device is abnormal, analyzing an adjustment parameter of the solder paste inspection device, and sending the adjustment parameter to the solder paste inspection device. A first prompt is displayed when the number of abnormal solder paste points is greater than or equal to the first predetermined value.

Abstract: IEEE 802.11 power management scheme for an ad hoc network is based on the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) access procedure to transmit/receive their data frames. CSMA/CA may waste the scarce energy and bandwidth due to frame collisions and lengthen the frame delay due to waiting backoff time. In addition, IEEE 802.11 power management scheme does not specify how to tune the ATIM window size in a beacon interval. However, the ATIM window size affects the power consumption and throughput of a network considerably. The fixed ATIM window size cannot always accommodate the various traffic conditions. To conquer these problems and to improve the performance of networks, we propose a energy efficient MAC protocol for IEEE 802.11 networks by scheduling transmission after the ATIM window and adjusting the ATIM window dynamically to adapt to the traffic status.