Koide Y.,Osaka University |
Nishiura H.,Osaka Institute of Technology
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012
A new yukawaon model is investigated under a family symmetry U(3)×S 3. In this model, all vacuum expectation values (VEVs) of the yukawaons, 〈Y f〉, are described in terms of a fundamental VEV matrix 〈Φ 0〉 as in the previous yukawaon model, but the assignments of quantum number for fields are different from the previous ones: the fundamental yukawaon Φ 0 is assigned to (3, 3) of U(3)×U(3), which is broken into (3, 1+2) of U(3)×S 3, although quarks and leptons are still assigned to triplets of U(3) and yukawaons Y f are assigned to 6 * of U(3). Then, VEV relations among yukawaons become more concise considerably than the previous yukawaon models. By adjusting parameters, we can fit not only quark mixing parameters but also lepton mixing parameters together with their mass ratios. © 2012 Elsevier B.V.
Yoshida K.,Osaka Institute of Technology
Journal of the Taiwan Institute of Chemical Engineers | Year: 2013
NOx emitted from a stationary diesel engine generator was treated with a hybrid system that achieves NOx reduction by means of nonthermal plasma (NTP) and temperature swing adsorption (TSA) driven by engine waste heat. TSA produces a low-volume gas mixture of N2 and highly concentrated NOx, which is effectively reduced by NTP treatment. The performance of NOx treatment is enhanced by the re-injection of the concentrated NOx into the engine intake. In this study, in particular, an oxidation catalyst was placed before the adsorber to enhance the adsorption of NOx by converting NO to NO2, with the aim of achieving a higher removal efficiency with a low adsorbent volume. The results show that it is possible for the treatment system to be downsized using the oxidation catalyst. The system's energy efficiency (the ratio of the amount of NOx to the input electrical energy) ranges from 260 to 304g(NO2)/kWh. © 2013 Taiwan Institute of Chemical Engineers.
Seki H.,Osaka Institute of Technology |
Mizumoto M.,Osaka Electro-Communication University
IEEE Transactions on Fuzzy Systems | Year: 2011
This paper addresses equivalence of fuzzy inference methods. It first presents several well-known fuzzy inference methods: the product-sum-gravity method, the simplified fuzzy inference method, the fuzzy singleton-type inference method, the single input rule modules connected type fuzzy inference method (SIRMs method), and the single input connected fuzzy inference method (SIC method). Second, three fuzzy inference methods of the product-sum-gravity method, simplified fuzzy inference method, and fuzzy singleton-type inference method, which are all widely used as fuzzy control methods, are shown to be equivalent to each other. Third, the equivalence conditions between the SIRMs method and the SIC method, known as single input type fuzzy inference method, are shown. Finally, it also gives the equivalence conditions between the single input type fuzzy inference methods and the previous three fuzzy inference methods. Investigating the equivalence among various fuzzy inference methods would help to understand the relationship of those fuzzy inference methods. © 2011 IEEE.
Onishi K.,Osaka Institute of Technology
Research Policy | Year: 2013
This article reports the first results on how monetary compensation plans for employee inventions affect R&D productivity, based on the notable panel data of Japanese firms. The study finds that the introduction of revenue-based compensation plans that are linked to patent performance lead to an increase in the number of high cited patents, while this never leads to an increase in the number of patent applications. Furthermore, this is strongly effective in smaller firms. These results indicate that the monetary incentives based on patent performance are effective on enhancing the motivation of employee inventors. © 2012 Elsevier B.V.
Kobayashi H.,Osaka Institute of Technology
Proceedings of the SICE Annual Conference | Year: 2012
This paper deals with a new 2D barcode based landmark system for self-localization of mobile robots. The most significant feature of the landmark proposed by the author is full self-containedness, in other words, it doesn't require any extra database nor mechanism such as internet connection because its own physical position, posture and size in the world coordinate system are all encoded in itself. In addition, thanks to using ISO/IEC 18004 standard known as "QR code" for the propsed method, code detection is considered to be suitable for robots and robust against noise. The author show some preliminary experiments including kidnapping problem. © 2012 SICE.
Daihen Corporation and Osaka Institute of Technology | Date: 2016-11-16
A metal powder contains not less than 0.10 mass% and not more than 1.00 mass% of at least one of chromium and silicon, and a balance of copper. The total content of the chromium and the silicon is not more than 1.00 mass%. In accordance with an additive manufacturing method for this metal powder, an additively-manufactured article made from a copper alloy is provided. The additively-manufactured article has both an adequate mechanical strength and an adequate electrical conductivity.
Daihen Corporation and Osaka Institute of Technology | Date: 2016-05-11
A metal powder contains not less than 0.10 mass % and not more than 1.00 mass % of at least one of chromium and silicon, and a balance of copper. The total content of the chromium and the silicon is not more than 1.00 mass %. In accordance with an additive manufacturing method for this metal powder, an additively-manufactured article made from a copper alloy is provided. The additively-manufactured article has both an adequate mechanical strength and an adequate electrical conductivity.
Ohtaka A.,Osaka Institute of Technology
Chemical Record | Year: 2013
Two types of polymer-supported nanometal catalysts with high catalytic activity and recyclability in water have been developed. One catalyst was composed of linear polystyrene-stabilized metal nanoparticles (PS-MtNPs). A palladium catalyst (PS-PdONPs) was prepared in water by the thermal decomposition of Pd(OAc)2 in the presence of polystyrene. The degree of immobilization of Pd, but not the size of the Pd nanoparticles, was dependent on the molecular weight and cross-linking of the polystyrene. The PS-PdONPs exhibited high catalytic activity for Suzuki, Heck, and Sonogashira coupling reactions in water and they could be recycled without loss of activity. Linear polystyrene was also suitable as a stabilizer for in situ generated PdNPs and PtNPs. The second catalyst was a polyion complex that was composed of poly[4-chloromethylstyrene-co-(4-vinylbenzyl)tributylammonium chloride] and poly(acrylic acid)-stabilized PdNPs (PIC-PdNPs). Aggregation and redispersion of PIC-PdNPs were easily controlled by adjusting the pH value of the solution. Polymer-supported nanometal catalysts offer opportunities for a wide range of applications in organic synthesis. Linear-polystyrene-stabilized PdO nanoparticles (PS-PdONPs) have shown high catalytic activity for Suzuki, Heck, and Sonogashira coupling reactions in water and they could be recycled without any loss of activity. Linear polystyrene was also suitable as a stabilizer for PdNPs and PtNPs. A polyion complex of poly[4-chloromethylstyrene-co-(4- vinylbenzyl)tributylammonium chloride] and poly(acrylic acid)-stabilized PdNPs (PIC-PdNPs) was also developed. Aggregation and redispersion of PIC-PdNPs were controlled by adjusting the pH value of the solution. Copyright © 2013 The Chemical Society of Japan and Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
News Article | February 28, 2017
Sending stuffed animals for a sleepover at the library encourages children to read with them, even long after the sleepover took place, say researchers in a new study in Heliyon. For the first time, the study proves stuffed animal sleepovers are an effective way to get children to read. The results also suggest that stuffed animal sleepover programs may help develop children's prosocial behavior by encouraging them to read the books the stuffed animals had chosen during their sleepover. The researchers behind the new study, from Okayama University, Kanazawa University, Osaka Institute of Technology and Kyushu University in Japan, say they hope their results support the global spread of this approach, which has a positive effect on children's reading habits. Stuffed animal sleepover programs are designed to get children interested in picture books. Children take their toys to a library for the night, where the animals search for books they want to read. (At this point, staff and volunteers take photos of the animals exploring the library and reading together.) The next day, the children collect their stuffed animals and the photos of what they did during the night. They're also given the books their animals chose to read. These programs are run all around the world, but until now there was no scientific evidence that they have an impact on reading. The new study reveals for the first time that children who take part in stuffed animal sleepover programs read picture books to their stuffed animals significantly more. "We wanted to know if there really was an effect, and if so, how long it lasts," said lead author Dr. Yoshihiro Okazaki of Okayama University. "Surprisingly, not only did the children show interest in the picture books, but they also began to read to their stuffed animals. This means that a new behavior pattern emerged that the children had not exhibited before; we did not expect anything like this." Reading is important for the development of children's language skills and imagination. When parents read to their children, it is a passive form of reading for the child. But when children read to their stuffed animals, it is a more spontaneous, self-directed form of reading, helping them develop into more active readers. The team organized a "book-night party" - a typical stuffed animal sleepover program - for 42 preschool children. The researchers looked at the children's beh-avior that day, after three days and after one month, to determine the effect and how long it lasts. Before the sleepover the children did not spend time looking at the books in their play area at preschool. Immediately after the sleepover, the number of children who read to the stuffed animals was significantly higher than the number who did not, but after three days the effect had worn off. The researchers also tested an approach for sustaining the effect: they reminded the children of the sleepover a month later, by hiding the stuffed animals and showing them the photos again the next day. This simple method led to a significant increase in the number of children reading to their stuffed animals. "The photographs captured the children's imagination - many children believed the stuffed animals really found the books," said Dr. Okazaki. "But not every child who participated in the program began reading to the stuffed animals. There were individual differences in the results of this program. Because early childhood is the period when children begin to distinguish between fantasy and reality, their tendency to fantasize would be one factor that determines the effect of the stuffed animal sleepover." Article: "The Stuffed Animal Sleepover: Enhancement of Reading and the Duration of the Effect," by Yoshihiro S. Okazaki et al. The article appears in Heliyon (February 2016), published by Elsevier. Heliyon is an online only, fully open access journal from Elsevier publishing quality original research across all disciplines. All Heliyon papers are freely available on both Heliyon.com and ScienceDirect. Heliyon is also indexed on Scopus and PubMed Central, ensuring it reaches the widest possible relevant audience.
News Article | April 14, 2016
(Phys.org)—A team of researchers with Osaka Institute of Technology in Japan, has developed liquid balls that propel themselves when exposed to laser light. In their paper published in the journal Advanced Functional Materials, the team describes how the liquid balls are made, how they can be used and some possible applications for them.