SYNTHESIS AND DEPOSITION OF SENSOR MATERIALS · 301 Therefore, in practice it is always necessary to search for the best compromise and choose the method which meets as many requirements as possible. At the same time, however, these requirements may change considerably during the transition from the device's elaboration phase to industrial produc- tion. Properties that may be preferred during elaboration, such as multifunctionality, an opportunity to vary the parameters of the technological process and the deposited material, and the speed of reorganiz- ing the technological process, differ greatly from the properties necessary during industrial fabrication, such as compatibility with basic technological processes, reproducibility, productiveness, and cost. Such differences in requirements are inevitable, and it is necessary to take them into account during research targeted toward the elaboration of devices designed for application in the chemical sensor market. 15. ACKNOWLEDGMENTS This work was supported by the World Class University (WCU) Program at the Gwangju Institute of Science and Technology (GIST) through a grant (Project No. R31-20008-000-10026-0) provided by the Ministry of Education, Science and Technology (MEST) of Korea, for the project titled "Development of Maritime Environmental Sensor Using Nano and Photonic technology," funded by the Ministry of Land, Transport and Maritime Affairs, Korea, and by the Korean Science and Engineering Foundation (KOSEF) NCRC grant funded by the Korean government (MEST) (No. R15-2008-006-01002-0). G. Korotcenkov and B. K. Cho are also thankful to the Korean BK21 Program for the support of their