Devices, systems and methods for passing a suture. The laser unit is shifted by a shift adjusting means in a predetermined direction with respect to the optical axis of the incident optical system so as to make an illuminance distribution of scanning lines on the scanned surface become substantially symmetrical about the scanning central axis. The non-orthogonal CID-based scheduling method and apparatus is capable of selecting the slots for use in the non-orthogonal CID-based scheduling according to a rule so as to overcome CID collision in the system of using the non-orthogonal CID. A first dipole element is formed from a portion of the first flexible conductor extending from a link member in a first direction transverse to a length of the elongated monopole radiating element. Rubber seals are included on the edges of the dowels to provide spacing or a gap between the dowel and the preexisting slab to allow for lateral independent movement of the adjacent slabs, and to prevent concrete from the newly poured second slab from entering into the gap.