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Yakiyama, Yumi,Ueda, Akira,Morita, Yasushi,Kawano, Masaki The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.86
<P>A tripyridyl multi-interactive ligand TPHAP is prepared by a one-pot reaction on a gram scale. Network formation of Co(<SMALL>II</SMALL>) with TPHAP<SUP>−</SUP> gave kinetic and thermally more stable products. The kinetic network showed an unprecedented dynamic network transformation on the crystal surface by a ligand exchange reaction.</P> <P>Graphic Abstract</P><P>Co(<SMALL>II</SMALL>) and multi-interactive ligand TPHAP afford a kinetic network followed by ligand exchange mediated dynamic network transformation on the crystal surface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc35078e'> </P>
Yakiyama, Yumi,Lee, Gil Ryeong,Kim, Sung Yeon,Matsushita, Yoshitaka,Morita, Yasushi,Park, Moon Jeong,Kawano, Masaki The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.31
<P>Crystalline powders self-assembled from interactive discrete molecules reversibly transformed from a porous structure to a 2D one with a nanometer-thick H<SUB>2</SUB>O layer by hydration/dehydration. Multi-point weak intermolecular interactions contributed to maintenance of each phase. This structure transformation induced a humidity-dependent ion conductivity change from insulator to 3.4 × 10<SUP>−3</SUP> S cm<SUP>−1</SUP>.</P> <P>Graphic Abstract</P><P>Powder analysis revealed that multi-interactive molecules formed an ion conductive nanometer-thick water layer at high humidity and porous insulator by dehydration. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc01568e'> </P>
Selective Formation of Conductive Network by Radical-Induced Oxidation
Koo, Jin Young,Yakiyama, Yumi,Lee, Gil Ryeong,Lee, Jinho,Choi, Hee Cheul,Morita, Yasushi,Kawano, Masaki American Chemical Society 2016 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.138 No.6
<P>Cd-based coordination networks having channels were formed selectively by using a redox-active aromatic ligand 2,5,8-tri(4-pyridyl)1,3-diazaphenalene (TPDAP, H(+)1(-)). An electron-conductive network having a pi-pi stacking columnar structure of TPDAP formed in the presence of a trace amount of TPDAP radical (1(center dot)). In contrast, a nonconductive network having a dimer unit of H(+)1(-) formed in the absence of 1(center dot). These results suggest the presence of a unique oxidation mechanism of TPDAP induced by formation of H(+)1(-)-1(center dot) dimer, which was initiated by a trace amount of 1(center dot). The dimerization increased HOMO level of H(+)1(-) moiety within the dimer to generate further radicals that could not form when H(+)1(-) was well isolated in CH3OH.</P>
Evaluating People’s Attention in the Real World
Niwat Thepvilojanapong,Yasunori Yakiyama,Oru Mihirogi,Masayuki Iwai,Kazunori Umeda,Yoshit Tobe,Ryosuke Shibasaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Although human activities in the World Wide Web are rapidly increasing due to the advent of many online services and applications, we still need to appraise how things such as a merchandise in a store or pictures in a museum receive attention in the real world. To measure people’s attention in the physical world, we propose a Sensor of Physical-world Attention using Lasers canning(SPAL). It is challenging to use alaser scanner because it provides only front-side circumference of any detected objects in a measurement area. Unlike cameras, a laser scanner poses no privacy problem because it does not recognize and record an in dividual. SPAL includes many important factors when calculating people’s attention, i.e., lingering time, direction of people, distance between people and a target object. To obtain such information for calculation, we develop three processing modules to extract information from raw data measured by a lasers canner. We define two attention metrics and two measurement models to compute people’s attention. To validate the proposed system, we implemented aprototype of SPAL and conducted experiments in the real-world environment. The results show that the proposed system is a good candidate for determining people’s attention.
Crystallinity-dependence of ionic conductivity in the ion pairs of a multi-interactive anion
Lee, Gil Ryeong,Ohtsu, Hiroyoshi,Koo, Jinyoung,Yakiyama, Yumi,Park, Moon Jeong,Inoue, Daishi,Hashizume, Daisuke,Kawano, Masaki The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.20
<P>Ammonium and sodium salts (ion pairs) of a multi-interactive tri-(4-pyridyl) hexaazaphenalenyl anion (TPHAP(-)) showed completely different ion-conductive properties depending on the crystal structure. TPHAP columnar crystals showed a high conductivity of 10(-3) S cm(-1) while retaining their structures even under humid conditions, whereas TPHAP dimer crystals exhibited a conductivity of similar to 10(-5) S cm(-1) with crystallinity deterioration. The main unit structures induced by multi-interactivity realized different water accessibility, which explains the differences in their ion conductivity and stability against humidity.</P>