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If you cannot get any help from UMC, then you have to guess. The fuse should be a short section of minimum width metal which then tapers to something considerably wider - 8 to 10 times minimum width. That width must be maintained to the pads for blowing them. You then need to experiment with blowing them. Charge a few uF up to a few volts and connect it to the fuse. I have looked at them under a microscope to see if they have blown cleanly.
Does UMC provide any help? (e.g., Design Rule suggestions - for the layout of the fuses, and for programming).
Sometimes fabs recommend the layout of teh fuses, but leave it up to the customer to determine the optimal and reliable (and minimum energy) way of fuse programming.
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