| Summary: | 碩士 === 國立清華大學 === 工業工程與工程管理學系 === 104 === The study is to use grating relief marks as the main feature in banknotes denomination for the blind, by printing 9 denominations of simulation banknotes to compare the correct rate and judgement time with the existing New Taiwan Dollar. The grating relief mark is a patch of horizontal lines of 8 cm high and 11 cm wide. By printing the marks on the left (short) edge of the banknotes with 1 patch, 2 patches and continuous patches without apace, it is able to code the banknotes into 3 denominations. Then, the same coding pattern is printed onto the top (long) edge, another 3 denominations is coded. These 6 denominations is then further doubled into 12 by coded with two sizes of grating stroke widths, the thicker one is 0.76mm wide (space 2.91mm); and the thinner one is the width 0.39mm wide (space 0.76mm). The relief height is 60μ. Compromising between the minimum fulfilments of 7 denominations of the Euro, against the constraint of that 12 denominations must require significant duration of learning and adaptation, the study finally determined to print 9 denominations for this study.
The study consists of a denominations sorting and real transaction experiment. The experiment group is the simulation banknote; the control group is the New Taiwan Dollar (5 denominations). Subjects are full blinds, 17males and 3 females. The denomination sorting requires that the subject to sort a pile of 90 randomly shuffled banknotes into 9 stacks of 10 each. The real transaction requires the subject to pay the exact amount of money from a stack of randomly shuffled banknotes upon the oral request of the experimenter (e.g. the amount is $5030). The experimental variables are correct rate and judgement time for a single banknote. The statistical analyses consist of the simple statistics of 2 variables, and T-test of the simulate banknotes with the New Taiwan dollar.
The results show that for the sorting experiment, the correct rate and judgement time on simulation banknotes is 98.2 %( 3%), and 7.96s (0.84s), it’s better than the New Taiwan dollar of (71.1%) ,and 13.86s(0.84s). For the real transaction, the correct rate and judgement time on simulation banknotes is 97.3 %( 4%), and 141s (97s), it is also better than 54.2% (9%), 422s (325s) of the New Taiwan dollar. Besides on correct rate, the judgement time has very obviously difference under the T-test statistical analysis.
The result of the study is promising. The number of denomination for the simulate banknotes is as high as 9, the correct rate is quite approaching to 100%, suggesting that the petition of “Without relying on any aid, whether others or assistive devices are able to independently identify the denomination of banknotes” is achievable, even though that the judgement time has not reached a satisfactory threshold in performing professional duty. In fact, most of countries are under 6 denominations in their banknotes system. If using the way by redundant coding, regrouping the grating relief marks, number of the marks and deposition of banknote, taking 12 coding lower to 6 coding, the expected correct rate and judgement time will be better.
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