Toyohashi University of Technology

www.tut.ac.jp/english/index.html
Toyohashi, Japan

Toyohashi University of Technology , often abbreviated to Toyohashi Tech, or TUT, is a national engineering university located in Toyohashi, Aichi, Japan. Distinguished for the upper-division student body where over 80% of them are transfer students from 5-year Technical Colleges called Kōsens, the Toyohashi Tech is one of the only two Universities of Technology, a form of universities in Japan, the other being Nagaoka University of Technology. Toyohashi Tech is also noted for the fact that majority of the students proceed to graduate schools. The university is locally nicknamed Gikadai . Wikipedia.


Time filter

Source Type

News Article | April 17, 2017
Site: phys.org

Molecular structures of unsubstituted and substituted poly (lactic acid). Credit: Tsuji, H. et al. Configurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers. Sci. Rep. 7, 45170; doi: 10.1038/srep45170 (2017). Hideto Tsuji, professor in Toyohashi University of Technology, and his colleagues have made a world-first discovery of 'molecular glue' action of a counterclockwise-helical molecule to glue two structurally-different clockwise-helical molecules together. This discovery was announced on March 24 in Scientific Reports. To bind two polymers coiled in the same direction was previously impossible. Consequently, the degree of freedom in polymer combination has increased, and development of new polymer materials with various properties has become possible. The research group led by Professor Hideto Tsuji conducts basic and applied researches on biodegradable polymers derived from renewable resources such as corn or potato starch. The group mainly studies a typical biodegradable polymer poly(lactic acid). Poly(lactic acid) is hydrolyzed and degraded in the human body and the resulting lactic acid is metabolized without causing adverse effects to the body. Because of this advantage, poly(lactic acid) is used in medical applications as a scaffold material for tissue regeneration and also in environmental applications. Poly(lactic acid) contains an asymmetric carbon and therefore occurs either as the L- or D-enantiomer, namely poly(L-lactic acid) or poly(D-lactic acid) (Fig. 1). Since the interaction between different enantiomers (i.e. between L and D) is stronger than that between the same enantiomers (e.g. between D and D), blending the two enantiomers results in co-crystallization of an L-enantiomer and a D-enantiomer (this phenomenon is also called stereocomplex formation). The stereocomplex has a higher melting point, better mechanical properties, and higher heat resistance and hydrolysis resistance than those of their constituent enantiomers, and therefore the stereocomplex can have wider applications than those of conventional biodegradable materials. Under these circumstances, stereocomplex formation between poly(lactic acid) has been actively researched in recent years. L-poly(lactic acid) is counterclockwise-helical, and D-poly(lactic acid) is clockwise-helical. Therefore, the fact that L-poly(lactic acid) and D-poly(lactic acid) form a stereocomplex together indicates that a counterclockwise-helical molecule and a clockwise-helical molecule are strongly attracted to each other. Tsuji et al. have also discovered that blending the L- and D-enantiomers of poly(2-hydroxybutanoic acid) (Fig. 1) (a poly(lactic acid) with its methyl group replaced by an ethyl group) results in stereocomplex formation as well. In addition, there are reports on the same phenomena occurring to poly(2-hydroxy-3-methylbutanoic acid) (Fig. 1) (a poly(lactic acid) with its methyl group replaced by an isopropyl group) and occurring even between poly(lactic acid) with different side chains (for example, between L-poly(lactic acid) and D-poly(2-hydroxybutanoic acid)). All these phenomena indicate the presence of strong interaction between a counterclockwise-helical molecule and a clockwise-helical molecule. This time, Tsuji et al. have found the action of a counterclockwise-helical molecule to glue two structurally-different clockwise-helical molecules that do not bind to each other otherwise (Fig. 2). This finding indicates that a clockwise-helical molecule would also have the action to glue two structurally-different counterclockwise-helical molecules that do not bind to each other otherwise. Through experiment using D-poly(lactic acid), L-poly(2-hydroxybutanoic acid), and D-poly(2-hydroxy-3-methylbutanoic acid), Tsuji et al. have discovered for the first time worldwide that counterclockwise-helical L-poly(2-hydroxybutanoic acid) acts as "helical molecular glue" to glue clockwise-helical D-poly(lactic acid) and clockwise-helical D-poly(2-hydroxy-3-methylbutanoic acid) and thereby co-crystallizes these two D-molecules despite that these two do not usually co-crystalize. This finding has opened the door to binding various polymers that are coiled in the same direction. Now that the degree of freedom in polymer combination has increased, development of new polymer materials with various properties has become possible. More information: Hideto Tsuji et al, Configurational Molecular Glue: One Optically Active Polymer Attracts Two Oppositely Configured Optically Active Polymers, Scientific Reports (2017). DOI: 10.1038/srep45170


IMAGE: The activated brain region differs according to the syllable when observing spatial-feature patterns. view more Credit: COPYRIGHT (C) TOYOHASHI UNIVERSITY OF TECHNOLOGY. ALL RIGHTS RESERVED. A research group, including Emeritus Professor Tsuneo Nitta, Professor Junsei Horikawa, and Assistant Professor Shunji Sugimoto at Toyohashi University of Technology along with Associate Professor Koichi Katsurada of Tokyo University of Science, has developed a technology that can recognize the numbers 0 to 9 with 90% accuracy using brain waves, or electroencephalogram (EEG), while uttering the numbers. Furthermore, the technology has also realized the recognition of 18 types of Japanese monosyllables from EEG signals with 60% accuracy, which shows the possibility of an EEG-activated typewriter in the near future. The details of this research will be presented at Interspeech 2017 held in Stockholm in August. http://www. The research group has collected EEG-data while uttering Japanese digits and monosyllables. Regarding these data, the group investigated digit and monosyllable recognition experiments. Up until now, speech-decoding from EEG signals has had difficulty in collecting enough data to allow the use of powerful algorithms based on 'deep learning' or other types of machine learning. The research group has developed a different research-framework that can achieve high performance with a small training data-set. The new framework is based on holistic pattern recognition using category theory, or composite mapping, in which a dual space and a tensor space including exterior algebra are introduced. In the experiment of spoken-digit recognition from EEG signals, 90% recognition accuracy was achieved. At the same time, 61% accuracy in 18 Japanese monosyllable recognition was achieved outperforming performance in previous research (humans have sufficient intelligibility of sentences with an 80% monosyllable recognition rate). Emeritus Professor Nitta and his group aim to develop a 'Brain Computer Interface' that recognizes utterances without voicing, or speech imagery. This technology may enable handicapped people, who have lost the ability of voice-communication, to obtain the ability once again. It is also expected that the technology would give a healthy person the most natural interface without any limitations as well. Furthermore, the research group plans to develop a device that can be easily operated with fewer electrodes and connected to smartphones within the next five years. This research was funded by the Ministry of Education, Culture, Sports, Science and Technology and the Japan Society for the Promotion of Science Research Grant 16K00251. We will hold a press conference on April 18 to present the details of this research at Toyohashi University of Technology.


Patent
Sharp Kabushiki Kaisha and Toyohashi University of Technology | Date: 2016-12-08

Provided is an ion sensor including a supporting substrate, a plurality of cells, a silicon substrate, a plurality of transistors, and an analog-digital conversion circuit. The plurality of cells, the plurality of transistors, and the analog-digital conversion circuit are provided above the supporting substrate. Each of the plurality of transistors has a corresponding gate provided on a first surface of the silicon substrate. The analog-digital conversion circuit is provided on the silicon substrate. The ion-sensing surface is provided on a second surface of the silicon substrate. The second surface is opposite to the first surface.


Patent
LG Corp and Toyohashi University of Technology | Date: 2017-01-04

An airborne microbial measurement apparatus and a measurement method thereof are provided. An airborne microbial measurement apparatus according to an embodimentincludes a discharge apparatus including a discharge electrode and a voltage supply unit applying a high voltage to the discharge electrode. A substrate is provided to a side of the discharge apparatus to collect an airborne microbe from air by a high voltage applied to the discharge electrode. A reagent injection apparatus supplies a dyeing reagent to the microbe collected on the substrate or a DNA of the microbe. A light emission measurement apparatus senses a quantity of light generated from the DNA to which the dyeing reagent is supplied. The discharge apparatus includes a controller controlling the voltage supply unit so that the voltage is applied to collect the airborne microbe or destroy an external wall of the collected airborne microbe.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-20

A transformer is provided between a power supply and a load, and includes a front stage circuit and a rear stage circuit each having a function of performing switching so as to alternately invert a polarity of output relative to input. The transformer further includes: a series unit provided in at least one of the front stage circuit and the rear stage circuit and composed of a pair of reactance elements connected in series to each other via a connection point; and a switch device which, with both ends of the series unit serving as a first port, causes a part between one end of the series unit and the connection point, and a part between the other end of the series unit and the connection point, to serve as a second port alternately through switching while inverting a polarity, and executes one of power transmission from the first port to the second port, and power transmission from the second port to the first port.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-06

A transformer is provided between a power supply, and a load with a resistance value R, and includes a two-terminal pair circuit composed of n-number of reactance elements that are mutually connected, where n is a natural number equal to or greater than 4. With respect to any value of the resistance value R of the load, an input impedance Z_(in) of the two-terminal pair circuit has a real number component of kR, where k is a constant, and an imaginary number component of 0. Such a transformer has a small size and a light weight, and does not need a coil, an iron core, and the like as used in a conventional transformer.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2015-02-25

A power inverter circuit 1 in accordance with one embodiment of the present invention is a bridge power inverter circuit comprising first and second switching elements 11, 12 sequentially connected in series between input terminals on higher and lower voltage sides and third and fourth switching elements 13, 14 sequentially connected in series between the input terminals on the higher and lower voltage sides and alternately turning on a set of the first and fourth switching elements 11, 14 and a set of the second and third switching elements 12, 14 so as to convert a DC power fed between the input terminals on the higher and lower voltage sides into an AC power. One of the sets of the first and third switching elements 11, 13 and the second and fourth switching elements 12, 14 is subjected to switching control at a frequency higher than that of the other.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2016-07-06

A transformer of distributed-constant type is provided between an AC power supply with a frequency f and a load with a resistance value R, and includes: a first converter connected to the AC power supply and having a length of /4; and a second converter provided between an end of the first converter and the load, and having a length of /4, where a wavelength at the frequency f is . Such a transformer has a small size and a light weight, and does not need a coil, an iron core, and the like as used in a conventional transformer.


Patent
Sumitomo Electric Industries and Toyohashi University of Technology | Date: 2015-10-07

A switching circuit comprising first to fourth semiconductor switch elements each having an input terminal, an output terminal, and a common terminal, an output terminal of the first semiconductor switch element and an output terminal of the third semiconductor switch element being connected to each other, a common terminal of the second semiconductor switch element and a common terminal of the fourth semiconductor switch element being connected to each other, a common terminal of the first semiconductor switch element and an output terminal of the second semiconductor switch element being connected to each other, a common terminal of the third semiconductor switch element and an output terminal of the fourth semiconductor switch element being connected to each other, and a pulse-like signal being applied to each input terminal of the first to fourth semiconductor switch elements such that the second and third semiconductor switch elements are in an OFF state when the first and fourth semiconductor switch elements are in an ON state and the second and third semiconductor switch elements are in an ON state when the first and fourth semiconductor switch elements are in an OFF state, further comprising a first capacitance element connected between the output terminal of the second semiconductor switch element and the input terminal of the fourth semiconductor switch element, and a second capacitance element connected between the input terminal of the second semiconductor switch element and the output terminal of the fourth semiconductor switch element, wherein the first capacitance element has a capacitance to reduce a parasitic capacitance between the input terminal and the output terminal of the fourth semiconductor switch element to less than that obtained when the first capacitance element is not connected at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal supplied to the fourth semiconductor switch element, and the second capacitance element has a capacitance to reduce a parasitic capacitance between the input terminal and the output terminal of the second semiconductor switch element to less than that obtained when the second capacitance element is not connected at a frequency N times (N is an integer of 1 or more) as high as a clock frequency of the pulse-like signal supplied to the second semiconductor switch element.


Patent
Yamanashi University, Sintokogio Ltd. and Toyohashi University of Technology | Date: 2016-03-02

[Problem to be solved] To provide a pouring control method, for a ladle-tilting automatic pouring device, where the operation for identification of the parameters, which normally takes much time to complete, can take less time and the device can pour with a high degree of precision by sequentially updating pouring model parameters according to the pouring situation. [Solution] The present method is a pouring control method for controlling pouring based on a mathematical model of a pouring process from input of control parameters to pouring of molten metal using a pouring ladle in an automatic pouring device with a tilting-type pouring ladle that pours the molten metal into a mold by tilting the pouring ladle that holds the molten metal, and the method comprises: identifying, using an optimization technique, a flow rate coefficient, a liquid density, and a pouring start angle that is a tilting angle of the pouring ladle at which flowing out of the molten metal starts, wherein the flow rate coefficient, the liquid density, and the pouring start angle are the control parameters in the mathematical model, based on weight of liquid that flows out of the pouring ladle and tilting angle of the ladle that are measured during pouring, and a command signal that controls the tilting of the pouring ladle, and updating the control parameters to the identified control parameters.

Loading Toyohashi University of Technology collaborators
Loading Toyohashi University of Technology collaborators