227results about How to "Quick and accurate determination" patented technology

The invention discloses a metro shield construction general segment assembling point location determining method. A shield tunneling machine is used for conducting shield tunneling construction on a construction tunnel along a tunnel central axis from back to front. After the shield tunneling construction is completed for one link, shield segment assembling construction is carried out. Before anylink of shield segment assembling construction is performed, first of all, segment assembling point locations of current shield segments are determined. Processes include the following steps that firstly, selectable assembling point locations are determined; secondly, selection influence indexes and weight coefficients of the selection influence indexes are determined, and the three selection influence indexes and the weight coefficients of the three selection influence indexes influencing segment assembling point location selection are determined separately; thirdly, the selectable assemblingpoint locations are selectively evaluated, wherein according to a weight coefficient method, the selection of all the selectable assembling point locations is evaluated separately, and the segment assembling point locations of the current shield segments are determined. The shield general segment assembling point location determining method is simple in step reasonable in design, convenient to achieve, good in using effect and capable of conveniently, fast and precisely determining the assembling point locations of the general segments.

The invention provides a method and device for achieving message layer-2 isolation based on a VLAN and an interchanger. The method includes the steps that a message is received and analyzed; when it is determined that the VLAN ID carried in the analyzed message is a preset VLAN ID and the analyzed message is in a layer-2 forwarding mode, layer-2 isolation is conducted on the analyzed message. According to the method and device, layer-2 isolation can be conducted on the message from the specific VLAN ID flexibly, and the problems existing in a port isolation method in the prior art are solved.

An auto trimming oscillator includes a Successive Approximation Register (SAR), a frequency detector and an n-bit comparator. The SAR is used to iteratively trim the oscillator output clock frequency based on a difference between a reference clock frequency and the oscillator output clock frequency. The oscillator is trimmed to deliver a clock frequency which is a closest match to the reference clock frequency.