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Evaluation of the Wear Resistance of PVD Coatings on Drills by Using a Slurry Jet Impact Test
Y. IWAI,Y. UENO,T. SUEHIRO,T. HONDA,S. HOGMARK 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
In this paper, we propose a slurry jet (water containing 1 ㎛ alumina particles) impact test in order to quickly evaluate the wear properties of physical vapor deposited (PVD) coatings on commercial cutting tools. Linear wear was obtained for both coating and substrate material, and the penetration through the coating into the substrate was signified by a sharp increase in slope of the wear versus time curve. The PVD coatings deposited on the tools showed the same wear rates as those on reference plate specimens produced by the same coating methods. We conclude that our proposed evaluation technique for coatings is considerably useful as a screening test when evaluating coated tools like twist drills, taps, end mills, gear hobs, etc.
Search for proton decay viap→νK+using260 kiloton·yeardata of Super-Kamiokande
Abe, K.,Hayato, Y.,Iyogi, K.,Kameda, J.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Wendell, R. A.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, K.,Yokozawa, T.,Kaji, H.,Kajita American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
Search for GUT monopoles at Super-Kamiokande
The Super-Kamiokande Collaboration,Ueno, K.,Abe, K.,Hayato, Y.,Iida, T.,Iyogi, K.,Kameda, J.,Koshio, Y.,Kozuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M. North-Holland ; Elsevier Science Ltd 2012 Astroparticle physics Vol.36 No.1
GUT monopoles captured by the Sun's gravitation are expected to catalyze proton decays via the Callan-Rubakov process. In this scenario, protons, which initially decay into pions, will ultimately produce ν<SUB>e</SUB>,ν<SUB>μ</SUB> and ν@?<SUB>μ</SUB>. After undergoing neutrino oscillation, all neutrino species appear when they arrive at the Earth, and can be detected by a 50,000 metric ton Water Cherenkov detector, Super-Kamiokande (SK). A search for low energy neutrinos in the electron total energy range from 19 to 55MeV was carried out with SK and gives a monopole flux limit of F<SUB>M</SUB>(σ<SUB>0</SUB>/1mb)<6.3x10<SUP>-24</SUP>(β<SUB>M</SUB>/10<SUP>-3</SUP>)<SUP>2</SUP>cm<SUP>-2</SUP>s<SUP>-1</SUP>sr<SUP>-1</SUP> at 90% C.L., where β<SUB>M</SUB> is the monopole velocity in units of the speed of light and σ<SUB>0</SUB> is the catalysis cross section at β<SUB>M</SUB>=1. The obtained limit is several orders of magnitude more stringent than the current best cosmic-ray supermassive monopole flux limit for β<SUB>M</SUB><10<SUP>-2</SUP> and also two orders of magnitude lower than the result of the Kamiokande experiment, which used a similar detection method.
Tanaka, T.,Abe, K.,Hayato, Y.,Iida, T.,Kameda, J.,Koshio, Y.,Kouzuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, IOP Publishing 2011 The Astrophysical journal Vol.742 No.2
<P>We present the result of an indirect search for high energy neutrinos from Weakly Interacting Massive Particle (WIMP) annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Data sets from SKI-SKIII (3109.6 days) were used for the analysis. We looked for an excess of neutrino signal from the Sun as compared with the expected atmospheric neutrino background in three upmu categories: stopping, non-showering, and showering. No significant excess was observed. The 90% C. L. upper limits of upmu flux induced by WIMPs of 100 GeV c(-2) were 6.4 x 10(-15) cm(-2) s(-1) and 4.0 x 10(-15) cm(-2) s(-1) for the soft and hard annihilation channels, respectively. These limits correspond to upper limits of 4.5 x 10(-39) cm(-2) and 2.7 x 10(-40) cm(-2) for spin-dependent WIMP-nucleon scattering cross sections in the soft and hard annihilation channels, respectively.</P>
A,Ueno,S,Kokubun,Y,Uchikawa 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2007 International Journal of Assistive Robotics and Me Vol.8 No.1
This paper presents a prototype real-time system that assesses the vigilance level of a subject and alerts the subject with sound stimulation when the assessed vigilance level is below a predetermined threshold. An acceleration property of saccadic eye movement, which is measured with a limbus eye tracker, is used as an index of the vigilance level. The algorithms for computing the index and for triggering sound stimulation according to the index value were implemented in a digital signal processor for realizing a real-time system. The developed system was evaluated through eye tracking tasks. The results indicated that the developed system stably assessed the vigilance level and stimulated the subject as designed when necessary. Although more precise and wide investigation is necessary to make a conclusion, we could confirm quantitatively that the system was able to arouse the subject by using sound stimulation. These results indicate a feasibility of the developed system not only for vigilance monitoring and subject stimulating, but also for exploring quantitatively effective conditions of stimulation to arouse the subject.
Tsukamoto,T. Ueno,K. Yamamoto,Y. Ohbuchi,H. Sakamoto 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
It is necessary for lower grade students to study the correct usage of tools as a base of the technical education for dismantling and assembling various machines. However, enough understanding has not been obtained though the usage of these tools when training first grade students. So, we started to develop a teaching text and materials within the students practice curriculum based on the dismantling and assembly of all-terrain vehicle [ATV] s, which is a very motivating for lower grade students. This practice makes the student learn both how to use the tools and the steering mechanism of cars through the dismantling and assembling of the ATV. It is possible to not only have the student learn about the knowledge obtained through the practice, but also they also acquire wider and deeper knowledge through making the text and teaching materials for the practice. The textbook and secondary educational materials of this practice curriculum were created in cooperation with a fifth grade student as part of their graduation research. As a result, an effective teaching and learning text and secondary educational material regarding manufacturing practice could be developed from the student s point of view. Making a teaching text and materials is effective for promoting the study and experience of engineering.
K. Tsukamoto,T. Ueno,K. Yamamoto,Y. Ohbuchi,H. Sakamot 한국공학교육학회 2010 공학교육연구 Vol.13 No.2
It is necessary for lower grade students to study the correct usage of tools as a base of the technical education for dismantling and assembling various machines. However, enough understanding has not been obtained though the usage ofthese tools when training first grade students. So, we started to develop a teaching text and materials within the students'practice curriculum based on the dismantling and assembly of all-terrain vehicle [ATV]'s, which is a very motivating forlower grade students. This practice makes the student learn both how to use the tools and the steering mechanism of carsthrough the dismantling and assembling of the ATV. It ispossible to not only have the student learn about the knowledgeobtained through the practice, but also they also acquire wider and deeper knowledge through making the text and teachingmaterials for the practice. The textbook and secondary educational materials of this practice curriculum were created in cooperation with a fifth grade student as part of their graduation research. As a result, an effective teaching and learningtext and secondary educational material regarding manufacturing practice could be developed from the student's point ofview. Making a teaching text and materials is effective for promoting the study and experience of engineering