The present invention provides a method and system for determining hedging transactions to meet required characteristics of risks associated with an insurance instrument, and mitigating the risks associated with the insurance instrument by executing hedging transactions. The joint includes a peripheral channel having a depth that is greater than a wall thickness of the first tubular member, and a weld is positioned in the peripheral channel. The plurality of image elements, and the associated GPU programs, is communicated from the CPU to a GPU. , a preparation method and use thereof. Accordingly, the calculation times of the temperature can be reduced, and the power consumption is therefore reduced.