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Research paper : Development of a pressure sensor using a piezoelectric material thin film (M. Akiyama et al.)−180−Synthesiology - English edition Vol.5 No.3 (2012) cars of Audi AG and Volkswagen AG from 2009, and these cars are sold in Europe and North America. I revised part of the text and included this point.2 Disadvantage of the piezoelectric sensorQuestion (Masahiro Okaji and Shuji Abe)(Subchapter 1.2) You wrote that the piezoelectric sensor “has disadvantages such as that absolute pressure measurements cannot be taken.” Does this pose any practical problem?Answer (Morito Akiyama)Since the combustion pressure of an automobile engine changes rapidly, it is possible to take measurements with a piezoelectric sensor. However, to prevent misunderstanding, I eliminated the expression “has disadvantages such as that absolute pressure measurements cannot be taken,” as this is an irrelevant comment.3 Reason for continuing the research at AISTQuestion (Masahiro Okaji and Shuji Abe)(Chapter 5) You write, “…There are still several more issues that must be solved…. It is still in the ‘valley of death.’” However, it seems that the demonstration test for durability, for example, entered the phase where it should be carried on by private companies. Is it still in the phase where R&Ds must be continued at AIST and universities? Since I get the impression that the research stage at AIST has passed, I think you should clearly state the reason why AIST should still continue the research.Answer (Morito Akiyama)The demonstration test for durability and others have entered the phase that should be done by private companies. However, to increase the integrity of the sensor, there are points that must be improved such as the stabilization of sensor signals and achievement of high output, as well as simplification of the sensor structure. I added this comment at the end of chapter 5 as projects that must be undertaken by AIST.4 Comparison of the studied sensor and commercial sensorQuestion (Masahiro Okaji)(Subchapter 4.2) As shown in Fig. 13, the discussion progresses by comparing the studied sensor and the commercial sensor. If the generated charge is at the same level as the commercial sensor, will it satisfy the condition for the car-mounted sensor?Answer (Morito Akiyama)I added the sentence, “It was determined that the minimum sensitivity as an actual sensor onboard a car was satisfactory if the generated charge was the same level as the commercial sensor.” to subchapter 4.2.

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