Vol.3 No.3 2010

Research paper : Development of a sensor system for animal watching to keep human health and food safety (T. Itoh et al.)−230−Synthesiology - English edition Vol.3 No.3 (2010) transmission simulation program is created using the data for the rate of infection spread to study the relationship between the node concentration and the time required to discover the infection, and this is utilized in the development of the monitoring program[3]. In this simulation, if it is determined that an infection is suspected when three chickens behave abnormally, it is known that by attaching the sensors to 5 % of the chickens, detection can be done two days faster than the visual observation currently set by the government.To extract the issues when such wireless sensing system is used in the poultry house, the above prototype node is made into a wing band so it can be easily attached to the chickens. Also, we are reviewing a health management system for poultry farms to monitor the heat stress during summer, by setting up the wireless network system in an experimental poultry house in the Ibaraki Prefectural Livestock Research Center[14].6 Progress and prospect of the researchThe objective of this research is to complete the practical level chicken health monitoring system by the end of FY 2011. While there are some differences in the progress of development of the elemental technologies listed in table 3, at this point, the overall achievement level compared to the initial goal is 60~70 %. For the digital piezoelectric accelerometer that is being developed as the key device among the elemental devices, we are ready to conduct demonstrations of the prototype node using the test device. For the digital bimetal thermosensor, the development of the new structure for manufacturing at the wafer level including the packaging process is in progress[15], and an investigation for a mass production process will be done in FY 2010. For custom-made RF-IC, design and a prototype are being done for scheduled completion in November 2010, and the node that is close to the final goal is to be completed within FY 2010. The technological issues include:・Development of the software for the reception system, and・Development of the low-cost wafer-level packaging technology for the digital MEMS sensor.Particularly, the packaging technology greatly affects the manufacture cost of the digital MEMS sensor device, and it is necessary to optimize not only the packaging process but also the manufacturing process of the device itself.The final goal of this research is the practical use, or the introduction to the sites of commercial poultry farming, rather than constructing a “practical level” system and demonstrating it. However, there are various issues that cannot be solved by technological development alone. In addition to the development of low-cost attachment and removal, there are issues of how to make this technology improve the farm productivity, and how to establish a government monitoring system.Fig. 7 Examples of data obtained by experimental infectionA/chicken/Yamaguchi/7/2004(H5N1) A/duck/Yokohama/ aq10/2003(H5N1) A/chicken/Miyazaki/ K11/2007(H5N1) Yokohama2003Changes in body temperature fluctuationChange in virus transmissionYamaguchi2004Miyazaki2007Hours after inoculationBody temperature (℃)2530354045024487296120144168Hours after inoculationBody temperature (℃)2530354045024487296120144168Hours after inoculationBody temperature (℃)2530354045024487296120144168Hours after inoculationBody temperature (℃)253035404504896144192240288336384Hours after inoculationBody temperature (℃)253035404504896144192240288336384Hours after inoculationBody temperature (℃)253035404504896144192240288336384Separately reared chickens in separate houseCo-reared chickens in same houseInoculated chickensVirus strain


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