Frontiers in Neuroscience of Human Language

Kuniyoshi L. Sakai 사단법인 한국언어학회 2009 한국언어학회 학술대회지 Vol.2009 No.12

Neuroscience of Second Language Acquisition

Kuniyoshi L. Sakai 사단법인 한국언어학회 2009 한국언어학회 학술대회지 Vol.2009 No.12

Channel Transfer Function estimation based on Delay and Doppler Profiler for 5G System Receiver targeting 500km/h linear motor car

Suguru Kuniyoshi,Shiho Oshiro,Gennan Hayashi,Tomohisa Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.5

A 500 km/h linear motor high speed terrestrial transportation service is planned to launch 2027 in Japan. In order to support 5G service in the train, the Sub-carrier spacing frequency of 30 kHz is planned to be used instead of common 15 kHz sub-carrier spacing to mitigate Doppler effect in such high-speed transportation. In addition, to increase the cell size of 5G mobile system, plural Base Station antenna will transmit the identical Down Link (DL) signal to form the expanded cell size along the train rail. In this situation, forward and backward antenna signals will be Doppler shifted by reverse direction respectively and the receiver in the train might suffer to estimate accurate Channel Transfer Function (CTF) for its demodulation. In this paper, Delay and Doppler Profiler (DDP) based Channel Estimator is proposed and it is successfully implemented in signal processing simulation system. Then the simulated performances are compared with the conventional Time domain linear interpolated estimator. According to the simulation results, QPSK modulation can be used even under severe channel condition such as 500 km/h, 2 path reverse Doppler Shift condition, although QPSK modulation can be used less than 200 km/h with conventional Channel estimator.

Comparison on Safety Features among HTGR’s Reactor Cavity Cooling Systems (RCCSs)

Takamatsu Kuniyoshi,Funatani Shumpei 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.3

Reactor cavity cooling systems (RCCSs) comprising passive safety features use the atmosphere as a coolant, which cannot be lost. However, their drawback is that they are easily affected by atmospheric disturbances. To realize the commercial application of the two types of passive RCCSs, namely RCCSs based on atmospheric radiation and atmospheric natural circulation, their safety must be evaluated, that is, they must be able to remove heat from the reactor pressure vessel (RPV) surface at all times and under any condition other than under normal operating conditions. These include both expected and unexpected natural phenomena and accidents. Moreover, they must be able to eliminate the heat leakage emitted from the RPV surface during normal operation. However, utilizing all of the heat emitted from the RPV surface increases the degree of waste heat utilization. This study aims to understand the characteristics and degree of passive safety features for heat removal by comparing RCCSs based on atmospheric radiation and atmospheric natural circulation under the same conditions. It was concluded that the proposed RCCS based on atmospheric radiation has an advantage in that the temperature of the RPV could be stably maintained against disturbances in the ambient air.

An ICI Canceling 5G System Receiver for 500km/h Linear Motor Car

Suguru Kuniyoshi,Rie Saotome,Shiho Oshiro,Tomohisa Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.6

This paper proposed an Inter-Carrier-Interference (ICI) Canceling Orthogonal Frequency Division Multiplexing (OFDM) receiver for 5G mobile system to support 500 km/h linear motor high speed terrestrial transportation service. A receiver in such high-speed train sees the transmission channel which is composed of multiple Doppler-shifted propagation paths. Then, a loss of sub-carrier orthogonality due to Doppler-spread channels causes ICI. The ICI Canceler is realized by the following three steps. First, using the Demodulation Reference Symbol (DMRS) pilot signals, it analyzes three parameters such as attenuation, relative delay, and Doppler-shift of each multi-path component. Secondly, based on the sets of three parameters, Channel Transfer Function (CTF) of sender sub-carrier number 𝒏 to receiver sub-carrier number 𝒍 is generated. In case of 𝒏≠𝒍, the CTF corresponds to ICI factor. Thirdly, since ICI factor is obtained, by applying ICI reverse operation by Multi-Tap Equalizer, ICI canceling can be realized. ICI canceling performance has been simulated assuming severe channel condition such as 500 km/h, 2 path reverse Doppler Shift for QPSK, 16QAM, 64QAM and 256QAM modulations. In particular, for modulation schemes below 16QAM, we confirmed that the difference between BER in a 2 path reverse Doppler shift environment and stationary environment at a moving speed of 500 km/h was very small when the number of taps in the multi-tap equalizer was set to 31 taps or more. We also confirmed that the BER performance in high-speed mobile communications for multi-level modulation schemes above 64QAM is dramatically improved by the use of a multi-tap equalizer.

Heavy Fermion in Ferromagnetic Kondo Model with Integer Spin

Shingo Kuniyoshi,Ryousuke Shiina 한국물리학회 2023 새물리 Vol.73 No.12

A weakly anisotropic ferromagnetic Kondo model with an integer impurity spin is investigated as an effective Hamiltonian for the underscreened Kondo physics. It is shown by using the numerical renormalization group (NRG) method that the thermodynamic properties exhibit an unexpected heavy fermion behavior at low temperatures. The mechanism of the heavy fermion formation and an approximated analytic formula for the γ value of the specific heat have been discussed in conjunction with the fixed point analysis in the NRG method.

A 2×2 MIMO Spatial Multiplexing 5G Signal Reception in a 500 km/h High-Speed Vehicle using an Augmented Channel Matrix Generated by a Delay and Doppler Profiler

Suguru Kuniyoshi,Rie Saotome,Shiho Oshiro,Tomohisa Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.10

This paper proposes a method to extend Inter-Carrier Interference (ICI) canceling Orthogonal Frequency Division Multiplexing (OFDM) receivers for 5G mobile systems to spatial multiplexing 2×2 MIMO (Multiple Input Multiple Output) systems to support high-speed ground transportation services by linear motor cars traveling at 500 km/h. In Japan, linear-motor high-speed ground transportation service is scheduled to begin in 2027. To expand the coverage area of base stations, 5G mobile systems in high-speed moving trains will have multiple base station antennas transmitting the same downlink (DL) signal, forming an expanded cell size along the train rails. 5G terminals in a fast-moving train can cause the forward and backward antenna signals to be Doppler-shifted in opposite directions, so the receiver in the train may have trouble estimating the exact channel transfer function (CTF) for demodulation. A receiver in such high-speed train sees the transmission channel which is composed of multiple Doppler-shifted propagation paths. Then, a loss of sub-carrier orthogonality due to Doppler-spread channels causes ICI. The ICI Canceller is realized by the following three steps. First, using the Demodulation Reference Symbol (DMRS) pilot signals, it analyzes three parameters such as attenuation, relative delay, and Doppler-shift of each multi-path component. Secondly, based on the sets of three parameters, Channel Transfer Function (CTF) of sender sub-carrier number n to receiver sub-carrier number l is generated. In case of n≠l, the CTF corresponds to ICI factor. Thirdly, since ICI factor is obtained, by applying ICI reverse operation by Multi-Tap Equalizer, ICI canceling can be realized. ICI canceling performance has been simulated assuming severe channel condition such as 500 km/h, 8 path reverse Doppler Shift for QPSK, 16QAM, 64QAM and 256QAM modulations. In particular, 2×2MIMO QPSK and 16QAM modulation schemes, BER (Bit Error Rate) improvement was observed when the number of taps in the multi-tap equalizer was set to 31 or more taps, at a moving speed of 500 km/h and in an 8-pass reverse doppler shift environment.

Emission Characteristics of MOS Electron Tunneling Cathode

Yokoo, Kuniyoshi 한국진공학회 1993 Applied Science and Convergence Technology Vol.2 No.3

실리콘 gate의 MOS 전자 턴넬링 전극을 구성하여 그 특성을 조사하였다. 전자 방출은 전 gate 영역에서 MOS diode의 전위차를 지나는 턴넬링에 의하여 일어나고 안정하였다. 측정된 전류에서 산화막과 gate에서의 열전자의 충돌을 연구하였다. 방출된 전류는 압력에 관계없이 일정하였다.

Delay and Doppler Profiler based Channel Transfer Function Estimation for 2×2 MIMO Receivers in 5G System Targeting a 500km/h Linear Motor Car

Suguru Kuniyoshi,Rie Saotome,Shiho Oshiro,Tomohisa Wada International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.9

In Japan, high-speed ground transportation service using linear motors at speeds of 500 km/h is scheduled to begin in 2027. To accommodate 5G services in trains, a subcarrier spacing frequency of 30 kHz will be used instead of the typical 15 kHz subcarrier spacing to mitigate Doppler effects in such high-speed transport. Furthermore, to increase the cell size of the 5G mobile system, multiple base station antennas will transmit identical downlink (DL) signals to form an expanded cell size along the train rails. In this situation, the forward and backward antenna signals are Doppler-shifted in opposite directions, respectively, so the receiver in the train may suffer from estimating the exact Channel Transfer Function (CTF) for demodulation. In a previously published paper, we proposed a channel estimator based on Delay and Doppler Profiler (DDP) in a 5G SISO (Single Input Single Output) environment and successfully implemented it in a signal processing simulation system. In this paper, we extend it to 2×2 MIMO (Multiple Input Multiple Output) with spatial multiplexing environment and confirm that the delay and DDP based channel estimator is also effective in 2×2 MIMO environment. Its simulation performance is compared with that of a conventional time-domain linear interpolation estimator. The simulation results show that in a 2×2 MIMO environment, the conventional channel estimator can barely achieve QPSK modulation at speeds below 100 km/h and has poor CNR performance versus SISO. The performance degradation of CNR against DDP SISO is only 6dB to 7dB. And even under severe channel conditions such as 500km/h and 8-path inverse Doppler shift environment, the error rate can be reduced by combining the error with LDPC to reduce the error rate and improve the performance in 2×2 MIMO. QPSK modulation scheme in 2×2 MIMO can be used under severe channel conditions such as 500 km/h and 8-path inverse Doppler shift environment.

Investigation on a Porous Wall-Cavity System for the Mixing Enhancement at Supersonic Flows

Nao Kuniyoshi,Minoru Yaga,Heuy Dong Kim 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5

In this study, a calculation was conducted to clarify an effect of the porous cavity on a supersonic flow field wherejetsare normally injected. Some experiments also were conducted. However, it is difficult to measure total pressure loss and the circulation between the main flow and cavity flow in the experiment. Calculation was conducted using AUSMDV scheme and the four stage Runge-Kutta scheme. As a result, some flow features were clarified. The circulation between the main flow and the cavity flow was mainly affected by the bow shock wave and dead water region. Moreover, effects of the porous cavity on the total pressure loss became clear.