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Triplet Energy Transfer between a Sacrificial PMP and Blue TPF2 Iridium Dopants Leading to Enhancement of OLED Device Performance
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Prophylactic and therapeutic effects for metabolic syndrome with the citrus peel extract
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가상현실 프로그램과 운동심상훈련이 정상 노인의 족저압과 균형능력^ 우울 및 낙상효능감에 미치는 영향 = Effects of virtual reality program and motor imagery training on plantar pressure^ balance ability^ depression and falls efficacy in the normal elderly
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내반 퇴행성 족관절염에 대한 과상부 절골술
- 검색키워드
- 저자 : Keisuke Kusaka (검색결과 4 건)
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MACHINE LEARNING APPLICATION TO PREDICT COMBUSTION PHASE OF A DIRECT INJECTION SPARK IGNITION ENGINE
Rio Asakawa,Keisuke Yokota,Iku Tanabe,Kyohei Yamaguchi,Ratnak Sok,Hiroyuki Ishii,Jin Kusaka 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.1
Lean-diluted combustion can enhance thermal efficiency and reduce exhaust gas emissions from spark-ignited (SI) gasoline engines. However, excessive lean mixture with external dilution leads to combustion instability due to high cycle-to-cycle variations (CCV). The CCV should be controlled as low as possible to achieve stable combustion, high engine performance, and low emissions. Therefore, a stable combustion control function is required to predict the combustion phase with a low calculation load. A machine learning-based function is developed in this work to predict the 50 % mass fraction burn location (MFB50). Input parameters to the machine learning model consist of 1-, 2-, 3-, and 4-cycle from a three-cylinder production-based gasoline engine operated under stoichiometric to the lean-burn mixture. The results show that the MFB50 prediction model achieves high accuracy when 2-cycle data are used relative to 1-cycle data, which implies that the previous cycle data affects the predicted MFB50 of the next cycle. As a result, the neural network model can predict the cyclic MFB50 error within ± 3 oCA CCV and ± 5 oCA CCV with 70 % and 90 % accuracy, respectively. However, an increasing number of cycle data worsens the prediction accuracy due to model over-learning.
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Current Source Gate Drive Circuits with Low Power Consumption for High Frequency Power Converters
Ayato Sagehashi,Keisuke Kusaka,Koji Orikawa,Jun-ichi Itoh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, three types of the gate drive circuits; voltage source, current source with continuous current and current source with discontinuous current gate drive circuits are compared from the view point of power consumption of the three types of the gate drive circuits and the switching loss of the main MOSFET. It is confirmed that the power consumption of the gate drive circuit is reduced by 56.4% using the current source gate drive circuit with discontinuous current source compared with that of the voltage source gate drive circuit by a switching test at the switching frequency of 1 MHz. Secondary, the switching loss of the main MOSFET is evaluated by experiment. The turn on and the turn off losses are 1.34 W and 1.76 W when the conventional voltage source gate drive circuit. On the other hand, the turn on and the turn off losses are 1.4W and 1.54W. The turn on loss and the turn off loss are almost same value because the input peak current of the conventional voltage source gate drive circuit and the input reactor peak current of the current source gate drive circuit with discontinuous current are same. Therefore, the current source gate drive circuit with discontinuous current can be used without increasing the switching loss of the main MOSFET similar to the conventional voltage source gate drive circuit. That is because the rise time and the fall time of the gate voltage on main MOSFET is same time.
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Keita Ohata,Masakazu Adachi,Keisuke Kusaka,Jun-ichi Itoh 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a multi-modular AC-DC converter system using wireless communication for a rapid charger of electric vehicles (EVs). The multi-modular topology, which consists of multiple modules, has an advantage on the expandability regarding voltage and power. In the proposed system, the input current and output voltage are controlled by each decentralized controller, which wirelessly communicates to the main controller, on each module. Thus, high-speed communication between the main and modules is not required. As the results in a reduced number of signal lines. The fundamental effectiveness of the proposed system is verified with a 3-kW prototype. In the experimented results, the input current imbalance rate is reduced from 49.4% to 0.1%, where total harmonic distortion is less than 3%.
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Voltage Control Method in Non-linear Dead-time Effect Region for Dual Active Bridge DC-DC Converter
Jun-ichi Itoh,Kengo Kawauchi,Hayato Higa,Hiroki Watanabe,Keisuke Kusaka 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a voltage control method for a Dual Active Bridge (DAB) converter with three-level operation in the dead-time effect region. The non-linear transmission power error is reduced by controlling the zero current phase to the dead-time or more because the nonlinear error of the transmission power occurs when the inductor current reaches zero during the dead-time. In addition, the voltage control is operated under the linear region which is decided from the output current and the zerovoltage period. The validation of the proposed method is confirmed by a 2.3-kW prototype. In the experiments, the non-linear error in the transmission power is reduced by 76.3%. The linearity between a control variable and an output current is confirmed. In addition, a load step between two modes of three-level operation is achieved without the dc offset in the inductor current. Moreover, the RMS value of the inductor current is reduced by 50.2% compared with the conventional triangular modulation.
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