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Hisatake, H.,Matsubara, I.,Maeda, K.,Yasuoka, H.,Mazaki, H.,Shinohara, H.,Takahashi, M. 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.1
We observed the photoinduced irreversible change of complex permeability and an additional remarkable disaccommodation of magnetic permeability (DA) of single crystalline samples of yttrium iron garnet(YIG) below room temperature. One of the most interesting characteristics of these phenomena is the appearance of metastability in these properties at low temperatures, $T{\leq}250K$. These results are interpreted within the context of configuration coordinate(CC) diagrams with large lattice relaxations.
Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yoshimizu, Yasuyuki,Hisatake, Shintaro,Kuwano, Shigeru,Terada, Jun,Yoshimoto, Naoto,Nagatsuma, Tadao The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach for generating highly stable coherent sub-terahertz (THz) signals for wireless communications. As proof-of-concept we transmit data at 100 GHz carrier frequency using on-off keying modulation and heterodyne detection. The sub-THz carrier signals are generated by photo-mixing two optical carrier signals at different frequencies, extracted from an optical frequency comb. We introduce a novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bit rate of 8.5 Gbit/s at 100 GHz.
Yusuke Asakura,Hiroki Tsuchiya,Hisatake Mori,Takashi Yano,Yasuhide Kanayama,Hideki Takagi 대한마취통증의학회 2011 Korean Journal of Anesthesiology Vol.61 No.5
Background: Venous thromboembolism (VTE) and the subsequent development of pulmonary embolism (PE) is a major cause of post-operative mortality in total knee arthroplasty (TKA). We evaluated whether the addition of an ultrasound-guided femoral nerve block with general anesthesia affected the incidence in the development of VTE following TKA. Methods: This was a retrospective non-randomized comparative study with patients assigned to groups based on the surgery date (pre-femoral nerve block versus post-femoral nerve block periods). All anesthesia and medical records of the patients who had undergone computer-navigated TKA in our facility between January 2009 and March 2010were retrospectively reviewed. Results: Forty patients were identified; 15 patients underwent computer-navigated TKA under general anesthesia alone (Group G) and 25 patients underwent surgery under general anesthesia combined with ultrasoundguided femoral nerve block (Group F). The incidence of development of VTE post-operatively was significantly lower in Group F (P = 0.037). Logistic regression analysis identified the use of a femoral nerve block as the most significant variable correlating with the incidence of post-operative development of VTE, and the odds ratio for VTE development in Group G was 3.12 (95% CI, 0.57-20.56). Conclusions: We suggest the possibility that the addition of a femoral nerve block on general anesthesia may reduce the incidence of the development of VTE following TKA.
Generation of Coherent Sub-Terahertz Carrier with Phase Stabilization for Wireless Communications
Yasuyuki Yoshimizu,Shintaro Hisatake,Shigeru Kuwano,Jun Terada,Naoto Yoshimoto,Tadao Nagatsuma 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
In this paper, we present a photonic approach forgenerating highly stable coherent sub-terahertz (THz) signals forwireless communications. As proof-of-concept we transmit data at100 GHz carrier frequency using on-off keying modulation andheterodyne detection. The sub-THz carrier signals are generatedby photo-mixing two optical carrier signals at different frequencies,extracted from an optical frequency comb. We introducea novel system to stabilize the phase of the optical carrier signals. Error-free transmission is successfully achieved up to a bitrate of 8.5 Gbit/s at 100 GHz.
Wireless Communication at 310 GHz Using GaAs High-Electron-Mobility Transistors for Detection
Stéphane Blin,Lucie Tohme,Dominique Coquillat,Shogo Horiguchi,Yusuke Minamikata,Shintaro Hisatake,Philippe Nouvel,Thomas Cohen,Annick Pénarier,Fabrice Cano,Luca Varani,Wojciech Knap,Tadao Nagatsuma 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
We report on the first error-free terahertz (THz) wirelesscommunication at 0.310 THz for data rates up to 8.2 Gbps using a18-GHz-bandwidth GaAs/AlGaAs field-effect transistor as a detector. This result demonstrates that low-cost commercially-availableplasma-wave transistors whose cut-off frequency is far below THzfrequencies can be employed in THz communication. Wirelesscommunication over 50 cm is presented at 1.4 Gbps using a unitravelling-carrier photodiode as a source. Transistor integration isdetailed, as it is essential to avoid any deleterious signals that wouldprevent successful communication. We observed an improvementof the bit error rate with increasing input THz power, followed bya degradation at high input power. Such a degradation appearsat lower powers if the photodiode bias is smaller. Higher-dataratecommunication is demonstrated using a frequency-multipliedsource thanks to higher output power. Bit-error-ratemeasurementsat data rates up to 10 Gbps are performed for different inputTHz powers. As expected, bit error rates degrade as data rate increases. However, degraded communication is observed at somespecific data rates. This effect is probably due to deleterious cavityeffects and/or impedance mismatches. Using such a system, realtimeuncompressed high-definition video signal is successfully androbustly transmitted.
Wireless Communication at 310 GHz using GaAs High-Electron-Mobility Transistors for Detection
Blin, Stephane,Tohme, Lucie,Coquillat, Dominique,Horiguchi, Shogo,Minamikata, Yusuke,Hisatake, Shintaro,Nouvel, Philippe,Cohen, Thomas,Penarier, Annick,Cano, Fabrice,Varani, Luca,Knap, Wojciech,Nagats The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
We report on the first error-free terahertz (THz) wireless communication at 0.310 THz for data rates up to 8.2 Gbps using a 18-GHz-bandwidth GaAs/AlGaAs field-effect transistor as a detector. This result demonstrates that low-cost commercially-available plasma-wave transistors whose cut-off frequency is far below THz frequencies can be employed in THz communication. Wireless communication over 50 cm is presented at 1.4 Gbps using a uni-travelling-carrier photodiode as a source. Transistor integration is detailed, as it is essential to avoid any deleterious signals that would prevent successful communication. We observed an improvement of the bit error rate with increasing input THz power, followed by a degradation at high input power. Such a degradation appears at lower powers if the photodiode bias is smaller. Higher-data-rate communication is demonstrated using a frequency-multiplied source thanks to higher output power. Bit-error-rate measurements at data rates up to 10 Gbps are performed for different input THz powers. As expected, bit error rates degrade as data rate increases. However, degraded communication is observed at some specific data rates. This effect is probably due to deleterious cavity effects and/or impedance mismatches. Using such a system, realtime uncompressed high-definition video signal is successfully and robustly transmitted.