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Research paper : Two types of lead users in a model for the transfer of technology into households (Y. Kubo et al.)−190−Synthesiology - English edition Vol.2 No.3 (2009) recognized. However, from the analysis of this research, to introduce advanced technology such as robots to the household, it can be seen that a social network composed of diverse lead users is needed in addition to academia and industry in order “to use” the technology. The model proposed in this research indicates the possibility that the household consumers can participate flexibly in the industrial activity using their practical knowledge. The model is expected to provide new research topics from the perspective of how to promote social innovation.AcknowledgementsI am grateful to the following people in conducting this research: Ms. Masayo Waki and Mr. Shuji Kato, cookery researchers of K.K. Trois Soeurs; Mr. Miki Shimizu and Ms. Chizuko Shimizu of Flying Saucer for providing information about interviews to various people; Mr. Kita Masaru, Mr. Ken’ichi Morijiri, and Mr. Tomohiro Mizutani of TEPCO for helping the collection of media information; Mr. Yoshiki Ogino of Panasonic Corporation for providing information on IH development; Ms. Hiromi Kawanishi for providing information on silicon spatulas; and all other people who cooperated in the interviews. I also thank Dr. Sachiko Abe, former President of Aoyama Gakuin Women’s Junior College for providing valuable advice; and Dr. Motoyuki Akamatsu and Dr. Koh Naito who took time to review the paper.NotesNote 1) Recently, a powerful argument has been proposed that for the determination of keyboard arrangement, a corporate strategy to prevent entry of newcomers by the formation of a patent barrier instigated by a trust of major manufacturers played a critical role[12].Note 2) The media information was determined as follows. For books, the books on cooking using IH cooking heater was selected visually among the books that contain “IH” in the title from the National Diet Bibliographical Database. For magazines, magazines that ranked within 5th place for circulation and were for readers 30 years old or above among “women’s magazine” and “cooking and nutrition” categories were selected from the Periodicals in Print in Japan 2008. Magazines that contain articles on cooking using IH cooking heaters were selected visually for years 2005 and 2006 when there were highest amount of information on the IH cooking heater. For television CMs, all electrification TVCMs of TEPCO and Kansai Electric Power Company were selected.Note 3) Even if there were several photographs, they were considered to be one data if they were for the same dish; even if it was one photograph or television CM, they were considered different data if there were different dishes. For magazines, advertisement and the text were separated; since the advertisements for cooking and fashion magazines were similar, they were jointly categorized as “advertisement.”Note 4) The IH cooking in advertisements were often for grill cooking, unlike in the books and magazines. Since IH could not be used with a grill, initially there were negative comments such as “you can’t bake fish with the IH cooking heater.” The grill on the IH cooking heater employs electrically heated wire rather than IH. Since the advertisements did not introduce any cooking method using new cooking tools, the figure in the graph is 0. Note 5) W conducted experiments for a cooking method where mixing is done using two wooden spatula in her own kitchen, and observed that the rice grains got caught between the two spatulas, were squashed, and clumped together. To improve this point, she used two turners instead of wooden spatulas. However, the top edge of the turner was not perpendicular to the handle, and when held in both hands, the tips did not come together but crossed, and therefore the ingredients could not be held. She used the silicon resin spatulas instead of turners and found that mixing can be done with no problem.Note 6) The import and sales of silicon spatulas were started for the first time in Japan by importer K who knew the high performance of silicon resin from his experience as a vacuum technology engineer. The product did not sell at all for the first three to four years, but the demand for the product rose from about 2004, and the sales for that year increased 2.7 times compared to the previous year.Note 7) A “select shop” is a retail store that sells products of various brands selected by the sales clerk. Flying Saucer was a wholesaler of cooking utensils for professional use, but started handling products for household use in March 30, 2001, and S who was a housewife became the store manager.Note 8) Developer W sought the silicon spatula form that was optimal for frying pan cooking using IH. The spatula designed and developed in collaboration with Kai Corporation was launched in December 2008.Note 9) The TEPCO web contents released October 2006 include the photograph of famous Chinese chef, Mr. Ken’ichi Ching, stirring fried rice holding the original spatulas from Flying Saucer in both hands. (http://www.tepco-switch.com/others/ad/index-j.html)Note 10) In IH, the pan itself becomes hot when the electricity is passed through the coil inside the stove, and the ingredients inside the pan are heated. Ignoring the variation of the resistance value of the metal of the pan, the power input and the heat value output of the pan will maintain a constant relationship. Also, ignoring the variation of the

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