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Yasuhiro Tanaka,Kenji Yonemitsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The current-voltage characteristics and mechanism of bias-induced breakdown in one-dimensional models for band and Mott insulators are investigated theoretically by using nonequilibrium Green’s functions. We attach the models to metallic electrodes, the effects of which are incorporated into the self-energy. For the models of both the band and the Mott insulators with lengths LC, the bias voltage induces a breakdown of the insulating state, and the breakdown mechanism shows a crossover depending on LC. When LC is smaller than the correlation length ξ = W/Δ, the threshold is determined basically by the bias Vth ~ Δ, where W and Δ are the bandwidth and the energy gap, respectively. For systems with LC ξ, the threshold is governed by the electric field, Vth/LC, which is consistent with a Landau-Zener-type breakdown Vth/LC / Δ2/W.
Discrete element simulations of continental collision in Asia
Tanaka Atsushi,Sanada Yoshinori,Yamada Yasuhiro,Matsuoka Toshifumi,Ashida Yuzuru Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.1
조립질 물질을 이용한 축소모형실험(예를 들어 모래상자실험)을 다양한 크기의 많은 지질학적 문제에 성공적으로 적용되어왔다. 이러한 물리적 실험은 개별요소법(DEM)을 이용하여 수치적으로도 수행될수 있다. 이연구에서는 현재 지구상에서 가장 중요한 지구조적 과정 중의 하나인 인도판과 유라시아판의 충돌문제를 시뮬레이션하기 위해 개별요소법을 적용하였다. 개별요소 시뮬레이션은 구조지질학뿐만 아니라 토질역학, 암석역학 등의 다양한 동역학적 분야에 적용되어왔다. 조사대상이 많은 작은 입자들의 조합으로 가정되기 때문에 개별요소 시뮬레이션은 거대하고 불연속적인 변형이 일어나는 대상을 다룰 수 있다. 그러나 DEM 시뮬레이션에서는 개개 입자에 대한 입력변수들과 전체 물성의 관계에 대해 거의 알려져 있지 않기 때문에 입력 변수들의 타당성을 검증하기 어려운 경우가 자주 있다. 그러므로 이전의 연구들에서는 시행착오에 의해 입력변수를 조정하여만 하였다. 이러한 어려움을 극복하기 위하여, 이 연구에서는 개별요소 시뮬레이션에 수치적인 이축 시험을 도입하였으며, 이러한 수치 시험 결과를 이용하여 충돌 모델에 사용되는 입력변수의 타당성을 검토하였다. 결과적인 층돌 모델은 동 아시아에서 관측되는 실제 변형과 매우 비슷하며, GPS 자료 및 동 아시아의 원위치 응력자료와 잘 대비된다.
Tanaka, Motohiro,Kawasaki, Shoji,Taoka, Hisao,Matsuki, Junya,Hayashi, Yasuhiro The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.1
In recent years, the debasement of the power quality of a distribution system such as deterioration of voltage imbalance and current imbalance or the increase of harmonics has been apprehended with diversification of the load by progress of power electronics technology and with increase of the amount of connection of a distributed generators for home use with the reduction of the effect on the environment. In this paper, the authors propose the restraint method of harmonics and improvement of voltage imbalance in distribution system utilizing the power conditioner systems of photovoltaic systems and verify the validity of the proposal method by the numerical calculation using an analytical model of distribution system.
Synthesis and biological evaluation of bilobol and adipostatin A.
Tanaka, Ayano,Arai, Yasuhiro,Kim, Su-Nam,Ham, Jungyeob,Usuki, Toyonobu Gordon and Breach ; Taylor Francis Health Sciences 2011 Journal of Asian natural products research Vol.13 No.4
<P>Concise total synthesis of bilobol 5-pentadecenylresorcinol (1), isolated from Gingko biloba fruits, has been achieved in 10 steps with 51% overall yield from 3,5-dihydroxybenzoic acid (3). Adipostatin A (2), isolated from the fruits as well as from Streptomyces cyaneus 2299-SV1, has also been synthesized in two steps from methylated bilobol (10). The structure-activity relationship study of synthetic products was described by means of cytotoxic assay against human KB carcinoma cell lines.</P>
Kawasaki, Yasuhiro,Saito, Mitsuru,Won, Jonghwa,Bae, Jin Young,Sato, Hajime,Toyoda, Hiroki,Kuramoto, Eriko,Kogo, Mikihiko,Tanaka, Takuma,Kaneko, Takeshi,Oh, Seog Bae,Bae, Yong Chul,Kang, Youngnam Frontiers Media S.A. 2018 Frontiers in cellular neuroscience Vol.12 No.-
<P>Glutamatergic dendritic EPSPs evoked in cortical pyramidal neurons are depressed by activation of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels expressed in dendritic spines. This depression has been attributed to shunting effects of HCN current (<I>I</I><SUB>h</SUB>) on input resistance or <I>I</I><SUB>h</SUB> deactivation. Primary sensory neurons in the rat mesencephalic trigeminal nucleus (MTN) have the somata covered by spine-like microvilli that express HCN channels. In rat MTN neurons, we demonstrated that <I>I</I><SUB>h</SUB> enhancement apparently diminished the glutamate receptor (GluR) current (<I>I</I><SUB>GluR</SUB>) evoked by puff application of glutamate/AMPA and enhanced a transient outward current following <I>I</I><SUB>GluR</SUB> (OT-<I>I</I><SUB>GluR</SUB>). This suggests that some outward current opposes inward <I>I</I><SUB>GluR</SUB>. The <I>I</I><SUB>GluR</SUB> inhibition displayed a U-shaped voltage-dependence with a minimal inhibition around the resting membrane potential, suggesting that simple shunting effects or deactivation of <I>I</I><SUB>h</SUB> cannot explain the U-shaped voltage-dependence. Confocal imaging of Na<SUP>+</SUP> revealed that GluR activation caused an accumulation of Na<SUP>+</SUP> in the microvilli, which can cause a negative shift of the reversal potential for <I>I</I><SUB>h</SUB> (<I>E</I><SUB>h</SUB>). Taken together, it was suggested that <I>I</I><SUB>GluR</SUB> evoked in MTN neurons is opposed by a transient decrease or increase in standing inward or outward <I>I</I><SUB>h</SUB>, respectively, both of which can be caused by negative shifts of <I>E</I><SUB>h</SUB>, as consistent with the U-shaped voltage-dependence of the <I>I</I><SUB>GluR</SUB> inhibition and the OT-<I>I</I><SUB>GluR</SUB> generation. An electron-microscopic immunohistochemical study revealed the colocalization of HCN channels and glutamatergic synapses in microvilli of MTN neurons, which would provide a morphological basis for the functional interaction between HCN and GluR channels. Mathematical modeling eliminated the possibilities of the involvements of <I>I</I><SUB>h</SUB> deactivation and/or shunting effect and supported the negative shift of <I>E</I><SUB>h</SUB> which causes the U-shaped voltage-dependent inhibition of <I>I</I><SUB>GluR</SUB>.</P>