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Mitsumasa Iwamoto,Takaaki Manaka,Kei Yoshiz 한국물리학회 2005 Current Applied Physics Vol.5 No.4
Carrier injection, carrier separation, and carrier transport in the films are key processes in organic devices. Therefore, the understanding of interfacial electrostatic phenomena is of crucial importance. From the view point of dielectric physics, we have been studying the surface polarization phenomena. Using Maxwell displacement current (MDC) measurement, optical second harmonic generation (SHG) measurement, and Kelvin-probe surface potential measurement, surface polarization phenomena at the interfaces have been elucidated experimentally and theoretically. This paper describes how the surface polarization phenomena can be clarified by these measurements. Finally, our experiment on evaporated Alq3 film is shown.
Mitsumasa Iwamoto,Ryosuke Tamura,Takaaki Manaka, 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Based on an analysis of the organic field effect transistor (OFET) as an element of the Maxwell-Wagner effect system, we studied the effect of the contact resistance Rc. The charging time tc leads to a decrease in the effective mobility, μeff, due to an increase in the response time required for charge accumulation at the interface. We show that the contact resistance Rc can be determined using the time-resolved microscopic optical second harmonic generation (TRM-SHG) measurement in combination with the typical FET characteristics because the TRM-SHG measurement directly probes carrier motion in the FET channel. With these results we discuss the carrier injection, transport and accumulation mechanisms in detail.
Mitsumasa Iwamoto,Takaaki Manaka,,Cheng-Quan Li 한국물리학회 2005 Current Applied Physics Vol.5 No.2
At the metal.organic film nano-interface, surface polarization phenomena are observed, due to the displacement of excess charges from metal to the films as well as alignment of polar dipoles. Surface potential method has been employed to examine these surface polarization phenomena, and the distribution of space charges and distribution of electronic density of states have been determined. However, for further understanding of the nanometric interface phenomena, it is very helpful to develop an experimental method that can detect electrical and optical phenomena induced by the space charge formation. In this paper, it is shown that optical second harmonic generation measurement is effective through our experiment on phthalocyanine films deposited on Al and Au electrodes.
( Mitsumasa Okano ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Despite of advances in high sensitivity troponin measurements and echocardiography, there are still diffi culties for the diagnosis of the acute coronary syndrome caused by the culprit lesion in left circumfl ex coronary artery. For examples, LCX is sometimes severely diseased with no signifi cant changes in ECG or minimal abnormalities in echocardiography. Methods: We hypothesized that we could evaluate the ECG changes in the patients who underwent PCI for LCX during the occlusion of LCX by ballooning, for the better understanding of the ECG changes when LCX was occluded. We retrospectively extracted ACS and Stable Angina Pectoris patients who underwent PCI for LCX in our hospital between April 2013 and February 2014. ECG before PCI and during the occlusion of LCX were compared. Patients with chronic total obstruction of LCX and other culprit lesions were excluded. Results: A total of 23 patients were included for these analyses. Thirteen patients (57%) showed the changes in 1 and aVL leads. Nine patients (39%) showed the changes in 2, 3, and aVF leads. Eleven patients (48%) showed the changes in aVR leads, all of whom accompanied with the simultaneous changes in 1 and aVL leads, and 6 of whom accompanied with additional changes in 2, 3, and aVF leads. Conclusions: Balloon occlusion of LCX showed a variety of changes in ECG, not only typical ECG changes in lateral leads but also changes in inferior leads with changes in aVR leads.