Because the number of elderly people is rapidly growing, using information and communication technology (ICT) for services to watch single-elder-person households has been attracting attention. Most of these services are aimed at detecting elders’ abnormalities. They could become more effective, from the preventive-medicine point of view, if additional functions were added to watch for any decline in the elders’ cognitive functions. In this paper, we describe a method for detecting minor declines in elders’ cognitive functions, which they may not be aware of, by measuring and analyzing their spiral-tracing ability using a tablet device. We developed such a measurement/analysis system and applied it to three groups of test participants: young, non-frail elders, and frail elders. This paper first describes the method for analyzing the numbers of out-of-orbit tracing attempts, the numbers of uncompleted attempts, the required time, and the angular velocities, and then refers to these tasks to reveal the elders’ characteristics from the analytic results.
A gallium complex (GaMq2Cl) consisting of two 2-methyl-8-hydroxyquinolines (Mq) and a chlorine was synthesized and used for the fabrication of organic light-emitting diodes (OLEDs). The photoluminescent peak of GaMq2Cl at 492 nm was as strong in intensity as that of tris(8-hydroxyquinolinato)aluminum (Alq3). The OLED using GaMq2Cl as an emitting material showed blue-green luminance of 10 490 cd/m2. When it was used as an electron transport material in a rubrene doped cell, an OLED with a high luminance of 27 700 cd/m2 was obtained. We found that GaMq2Cl also was useful as a host material.
Children with autism have difficulties in social
interaction with other people and much attention
in recent years has been directed to robots as therapy
tools. We studied the social interaction between
children with autism and robots longitudinally
to observe developmental changes in their
performance. We observed children at a special
school for six months and analyzed their performance
with robots. The results showed that two
children adapted to the experimental situations
and developed interaction with the robots. This
suggests that they changed their interaction with
the robots from an object-like one into an agentlike
one.
We improved the characteristics of blue-polymer-light-emitting diodes by introducing hole-transporting and electron-transporting layers. Poly[(9,9-dioctylfluorene-2,7-diyl)-alt-(triphenylamine-4,4'-diyl)] [PF8-TPA (50%)], poly[(9,9-dioctylfluorene-2,7-diyl)-co-(stilbene-4,4'-diyl)] [PF8-SB (10%)], and poly[(9,9-dioctylfluorene-2,7-diyl)-alt-(pyridine-2,6-diyl)] [PF8-Py (50%)] were used as the hole-transporting material, blue-light-emitting material and electron-transporting material, respectively. It was found that by introducing the hole-transporting layer, luminance and efficiency were greatly increased. At 1000 cd/m2, efficiency was increased from 0.60 cd/A for a single layer device to 1.29 cd/A for a bilayer device and external quantum efficiency was increased from 0.60% for a single layer device to 0.74% for a bilayer device. Efficiency and external quantum efficiency at 1000 cd/m2 can be further increased up to 1.50 cd/A and 0.95%, respectively, by introducing the electron-transporting layer. These improvements of efficiencies are supposed to be achieved by the good confinement of holes and electrons in the emitting layer by the hole-transporting layer and electron-transporting layer.
Red phosphorescent polymer light-emitting diodes based on bis(2-(2'-pyridyl)benzo[b]thiophene-N,C3)iridium(III)acetylacetonate [btp2Ir(acac)] and poly[(9,9-dioctylfluorene)-alt-(pyridine)] (PF8-Py) have been investigated. The btp2Ir(acac):PF8-Py blend device emitted a rich red phosphorescence from the btp2Ir(acac) complex. This is due to the effective energy transfer from the PF8-Py copolymer to btp2Ir(acac) enhanced by the pyridine unit in the copolymer. By the addition of a hole transporting material, i.e., N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD), to the btp2Ir(acac):PF8-Py blend, the driving voltage of the device was dramatically lowered and luminance and efficiency were greatly increased. Device performance can be further improved by introducing a hole transporting layer (HTL). The multilayer device, with a poly[(9,9-dioctylfluorene)-alt-(triphenylamine)] (PF8-TPA) layer as a hole transporting layer, showed a maximum luminance of 2600 cd/m2, a maximum efficiency of 3.78 cd/A and a maximum external quantum efficiency of 4.92%. These are supposed to be obtained by having a good carrier balance in an emitting layer, an effective energy transfer from PF8-Py to the btp2Ir(acac) complex, and a highly-efficient triplet emitter.
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