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Takeyuki Moriuchi,Keisuke Morishima,Yuji Furukawa 한국정밀공학회 2008 International Journal of Precision Engineering and Vol.9 No.2
As a biofuel source, direct photosynthetic/metabolic biofuel cells (DPBFC) use cyanobacteria whose photosynthesis and metabolization reactions can convert light energy to electricity. In our previous work, we fabricated a prototype micro-DPBFC that could generate a peak current density of 36 ㎂/㎠ and a maximum power density of 270 ㎻/㎠. In this study, we improve on the previous results by using carbon micro electromechanical systems (C-MEMS), formed from the pyrolysis of patterned photoresist, to fabricate carbon electrodes of an arbitrary shape and controlled porosity to increase the surface area. With these new C-MEMS electrodes, the maximum power density of the micro-DPBFC was 516 ㎻/㎠, a performance twice as good as the results of our previous work.
Generating a Category Set of Words Using a Hierarchical Part-of-Speech System and Tagged Corpus
( Takeyuki Kojima ),( Yoshiyuki Kotani ) 한국언어정보학회 2002 국제 워크샵 Vol.2002 No.-
In this paper, we propose a method of generating a propercategorization of morphemes by giving a hierarchical part-ofospeech system and a corpus tagged using this part-of-speech system. Our method use hierarchical information in the part-of-speech system and statistical information in the corpus to generate a category set. The statistical information is based on te context of occurrence of categories. First, we specify the format of given information. Then, we describe an algorithm to generate a proper categorization. Finally, we present the results of our experiments in applying this method. We obtaind a moderately proper categorization and found several candidates for improvement.
Flow-induced Vibration of a High-speed Train Running in a Tunnel
Takeyuki KODERA,Hiroki NAGAI,Keisuke-ASAI,Osamu Terashima 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
In recent years, flow-induced vibration on the tail car of a high-speed train cruising in a tunnel has become a critical aerodynamic problem because it makes a ride comfort of the train poor. To further increase the train speed, it is required to identify the cause of this phenomenon and take necessary countermeasures. The objective of the present study is to clarify the effects of the tunnel wall on vibrations of a high-speed train running inside a tunnel. We conducted wind tunnel tests of a simplified train model with a flat plate simulating the effect of tunnel wall. Pressure transducers were used to measure unsteady pressure fluctuations on the tunnel wall and Pressure Sensitive Paint (PSP) was applied to measure time-averaged surface pressure distribution on the train model. In addition, we conducted Large Eddy Simulation (LES) calculation for the same model and test condition. In the experiment, pressure fluctuations with the Strouhal number similar to the actual case were observed near the tail car locations. The results of LES calculation indicated that LES could reconstruct the spectrum of pressure fluctuation that observed in the experiment. It was suggested from these results that the vibrations on the tail car were caused by the interaction of the flow separated from the tunnel side of the tail car with the tunnel wall.
Development of a Flexible Direct Photosynthetic/Metabolic Biofuel Cell for Mobile Use
Takeyuki Moriuchi,Shiro Sumida,Akihiro Furuya,Keisuke Morishima,Yuji Furukawa 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.1
We have developed a direct photosynthetic/metabolic biofuel cell (DPBFC) without a mediator, based on the extraction of electrons directly from bacteria using a polyaniline electrode. Since previous developments of this nature are rigid, they are not suitable/or use on curved or soft surfaces. Our DPBFC has a flexible structure due to its flexible components: a membrane electrode assembly made of Nafion 117, a carbon cloth electrode made of modified polyaniline, a copper foil current collector, an anode chamber made from molded polydimethylsiloxane (PDMS), and a cathode chamber and cover cut from a PDMS membrane. Silicone bonds were used/or assembling the individual parts. Our 50×50×3-㎜ flexible DPBFC has a stable electrical power output up to a bending angle of 170°. The maximum power density using purple photosynthetic bacteria (Rhodopesudomonas palustris) as a fuel source was 5.26㎼/㎝2 with an open-circuit voltage of 0.089 V.
Takeyuki Abe,Hiroyuki Sasahara 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The direct metal lamination is a kind of the additive manufacturing process using the arc welding technology; where the molten metalmade by the arc discharge is accumulated successively in this process. Overhanging shapes can be fabricated without supportmaterials but lamination height error is caused in largely inclined area. In this paper, the lamination height error was estimated byusing the accumulated metal shape model. Then, the lamination height error was compensated by changing welding torch feed speedso that the top surface of the laminated layer became horizontal. As a result, not only the lamination height error was decreased by50%, but average inclination angle error was decreased by 50%.
Global Trends in Internal Combustion Engines
Takeyuki, Kamimoto 경상대학교 공과대학 항공기계공학부 1999 WORKSHOP 자료집 Vol.1999 No.1
Global wanning, energy saving and local pollution issues demand more advanced propulsion systems for automobiles for the future. These demands are accelerating the development of new systems such as fuel-cell and hybrid vehicles. This article describes first the state-of-art of these new technologies and relevant factors such as fuel cost and customers needs, and then introduces several estimates on the time schedule of possible introduction of these technologies. The performances of the conventional piston engines are being significantly improved recently so as to be competent to these new systems. The current trends in internal combustion engines are also explained in the latter half of the article.
Temporal Measurement of Size and Concentration of Soot Aggregates in Diesel Exhaust
Takeyuki Kamimoto,Toshiaki Nakajima,Myung-whan Bae 한국자동차공학회 2001 한국자동차공학회 Symposium Vol.- No.-
An optical method to measure the size and number density of soot aggregates in the diesel exhaust has been proposed. Two laser beams in co-axial alignment transmit a soot loaded exhaust gas flow, and the transmittance at each wavelength is detected simultaneously. Volume equivalent diameter and number density of soot aggregates in the optical path can be theoretically given by the transmittance values measured at two wavelengths. A test conducted using a single cylinder DI diesel engine showed that the proposed method is able to measure the temporal variations of the size and number density of soot aggregates in the diesel exhaust at a transient mode operation.<br/> <br/>
Moriuchi, Takeyuki,Morishima, Keisuke,Furukawa, Yuji Korean Society for Precision Engineering 2008 International Journal of Precision Engineering and Vol.9 No.2
As a biofuel source, direct photosynthetic/metabolic biofuel cells (DPBFC) use cyanobacteria whose photosynthesis and metabolization reactions can convert light energy to electricity, In our previous work, we fabricated a prototype micro-DPBFC that could generate a peak current density of $36{\mu}A/cm^{2}$ and a maximum power density of $270nW/cm^{2}$. In this study, we improve on the previous results by using carbon micro electromechanical systems (C-MEMS), formed from the pyrolysis of patterned photoresist, to fabricate carbon electrodes of an arbitrary shape and controlled porosity to increase the surface area. With these new C-MEMS electrodes, the maximum power density of the micro-DPBFC was $516nW/cm^{2}$, a performance twice as good as the results of our previous work.