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on the circular curve, lateral acceleration affects comfort. on the spiral, both lateral acceleration and jerk affect comfort.  the determination of maximum curving speed on the basis of lateral acceleration only is not critical because the lateral acceleration is proportional to the square of speed whereas jerk is proportional to cubic power of speed. the maximum speed on a curve is thus signi...

in recent years, fashion has been introduced as a prominent taste which is imposed by owners of this industry to the society. recently change of consumption patterns have been increased rapidly, while changes in fashion industry has also changed industries and economies of these countries as well. through changes in global relationships and structures, omitting industrial concentrated productio...

the binary and ternary codes spanned by the rows of the point by block incidence matrices of some 2-designs and their complementary and orthogonal designs are studied. a new method is also introduced to study optimal codes.