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A process control system in a multi-input/output coordinate control system for executing coordinate control of a main input. The process control system sets an operating point set value for an operating point of an n-th control output, generates the n-th control output to control the main input base

A process control system in a multi-input/output coordinate control system for executing coordinate control of a main input. The process control system sets an operating point set value for an operating point of an n-th control output, generates the n-th control output to control the main input based on the n-th control output, and generates an m-th control output to control the operating point of the n-th control output so that the operating point of the n-th control output becomes equal to the operating point set value, thereby to allow the n-th control output of fast response to operate at the operating point set value by controlling the main input.

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A process control system in a multi-input/output coordinate control system for executing coordinate control of a main input. The process control system sets an operating point set value for an operating point of an n-th control output, generates the n-th control output to control the main input base

A process control system in a multi-input/output coordinate control system for executing coordinate control of a main input. The process control system sets an operating point set value for an operating point of an n-th control output, generates the n-th control output to control the main input based on the n-th control output, and generates an m-th control output to control the operating point of the n-th control output so that the operating point of the n-th control output becomes equal to the operating point set value, thereby to allow the n-th control output of fast response to operate at the operating point set value by controlling the main input. te across said reflective boundaries.3. The site marker of claim 2, wherein the surface contour is selected from the group consisting essentially of a coiled contour; a multi-planar contour; a faceted contour; a notched contour, a grooved contour; a lobulate contour; and combinations thereof.4. The site marker of claim 2, wherein the body comprises a coil having a least one helical groove.5. The site marker of claim 4, wherein the body is formed at least in part of stainless steel.6. The site marker of claim 4, wherein the diameter of the coil is from about 0.5 mm to about 5 mm; and the length of the coil is from about 1 to about 10 times the diameter.7. The site marker of claim 1, wherein the body has a body surface texture which includes a plurality of distinct reflective boundaries having a contrast in acoustical impedance of at least about 15 times with the tissue of the selected site across said reflective boundaries.8. The site marker of claim 7, wherein the surface texture is selected from the group consisting essentially of a porous texture; a frosted texture; a matte texture; a shot-peened texture; a scored texture; a pitted texture; and combinations thereof.9. The site marker of claim 7, wherein the body is generally spherical.10. The site marker of claim 9, wherein the surface texture is selected from the group consisting of a frosted texture; a matte texture; a shot peened texture; and combinations thereof.11. The site marker of claim 10, wherein the body is formed of stainless steel.12. The site marker of claim 10, wherein the body has a diameter of from about 0.5 mm to about 4 mm.13. The site marker of claim 1, wherein the matrix if formed of a material selected from the group consisting essentially of metal, ceramic materials, metal oxides, polymer, and composites and mixtures thereof.14. The site marker of claim 1, wherein the surface contour is selected from the group consisting essentially of a generally cylindrical shape, a generally cylindrical shape with a band, a cruciform shape, a polyhedral shape, a stellate shape, a generally spherical shape, a coil shape, and the shape of a known symbol.15. The site marker of claim 1, wherein the body is at least in part formed of a porous material, has a porous surface texture, and has the interior configuration with a plurality of internal gas-filled pores.16. The site marker of claim 15, wherein the average size of the plurality of internal gas-filled pores ranges from about 5 micrometers to about 40 micrometers.17. The site marker of claim 15, wherein the porous material is selected from the group consisting essentially of sintered metal, polyethylene, and polytetrafluoroethylene.18. The site marker of claim 15, wherein the surface contour is generally cylindrical.19. The site marker of claim 18, wherein the diameter of the generally cylindrical body is from about 0.5 mm to about 5 mm; and the length of the generally cylindrical body is from about 1 to about 10 times the diameter.20. The site marker of claim 19, wherein the diameter of the generally cylindrical body is about 1.5 mm; and the length of the generally cylindrical body is from about 5 to 7 times the diameter.21. The site marker of claim 15, wherein the body has a surface contour which includes a plurality of distinct reflective surface portions of the body to enhance an acoustic signal.22. The site marker of claim 21, wherein the surface contour includes at least two generally planar body portions having generally flat surfaces.23. The site marker of claim 22 wherein the surface contour is a generally polyhedral solid having multiple planar surface portions.24. The site marker of claim 22 wherein the body has a maximum dimension of about 0.5 mm to about 5 mm.25. The site marker of claim 22, wherein the body is generally cruciform in cross-section, and at least one of the flat surfaces is aligned substantially perpendicularly to at least one other of the flat surfaces, so as to reinforce an acoustic sig