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New Functional Devices Using Josephson Vortices in Strongly Anisotropic Superconductors
Kazuto Hirata 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
In strongly anisotropic superconductors, we have measured the Josephson-vortex (JV) flowresistance with the current along the c-axis and the magnetic field parallel to the superconducting layers. We found a universal periodic oscillations of the flow-resistance to the magnetic field. The oscillations exist with the same period over a wide range of temperatures and magnetic fields. The oscillations provide several important experimental possibilities: the three-dimensionally (3D) ordered state of JVs in vortex physics, a novel application as a magnetic sensors, and a proposal for new functional devices. In the oscillations, the period is found to change to double, depending on the magnetic fields, the applied currents, and the size of the junctions. This suggests a transformation to a rectangular lattice from the 3D ordered state (triangular lattice) of JVs. Detailed analyses on the oscillations show that this property can afford a novel magnetic sensor to detect the absolute magnetic field and to measure the field precisely to an accuracy of 0.001 mT even under Teslaorder high-magnetic fields. Furthermore, the periodic oscillations lead us to propose a novel device structure with nano-technology, provided we can put nano-electrodes onto the superconducting layers.츺
Kazuto Yamashita,Hisanari Ishii,Kiichi Hirota,Masami Sato,Hiroko Tanabe,Kazuhiko Fukuda,박문호,권도영,김용현 대한마취통증의학회 2012 Korean Journal of Anesthesiology Vol.62 No.5
Stress-induced cardiomyopathy, also referred to Takotsubo cardiomyopathy or apical ballooning syndrome presents in perioperative period. We demonstrated a case of Takotsubo cardiomyopathy recognized after general anesthesia for bladder hydrodistension therapy as ambulatory surgery, which we surmise was due to inadequate blockage of surgical stress and sympathetic discharge against noxious stimulus during ambulatory anesthesia.
Quantum Searching as a Resonance
Kazuto Oshima 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.51
We reexamine the driving Hamiltonian in the continuous time formulation of Grover's algorithm by Farhi and Gutmann from the standpoint of a resonance. For a quantum system with a given oracle Hamiltonian Ejwihwj, we show that the driving Hamiltonian Ejsihsj produces jwi especially well among the family fE0jsihsjg. We also see that it practically attains a geometrical optimum time.