http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
FPGA-Based Binary Labeling Signal Transmission System
Toshiyuki Inoue,Kohei Nomura,Ryosuke Noguchi,Natsuyuki Koda,Akira Tsuchiya,Keiji Kishine 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.3
We implemented and evaluated our newly developed binary labeling signal transmission system using field-programmable gate arrays. In this system, the state of “0” or “1” of labeling signals is related to modulation or non-modulation of frame signals, and the labeling signals can be multiplexed to frame signals and transmitted without changing the configuration of the original frame signal. We designed a modulation-system protocol for implementing the above system and propose a digital smoothing technique for stabilizing a phase-locked loop circuit. We verified that our digital smoothing technique prevents bit error of the modulated frame signals in the implemented transmitter. The labeling signal multiplexed to the frame signals is demodulated without bit error in the implemented transceiver.
Design Method for Active-shunt-feedback Type Inductorless Low-noise Amplifiers in 65-nm CMOS
Toshiyuki Inoue,Akira Tsuchiya,Keiji Kishine 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.2
We demonstrated low-power and compact active-shunt-feedback type inductorless low-noise amplifiers (LNAs) in 65-nm CMOS. We pointed out the importance of considering an intermediate-node voltage in the LNA, and proposed a design method focusing on the intermediate voltage. The influence of the intermediate voltage upon the gain and noise figure was examined by a circuit simulator, and it was clarified that the intermediate voltage of VDD/2 was appropriate for high gain and low noise figure. Based on the proposed method, the active-shunt-feedback type LNA was fabricated in a 65-nm CMOS chip. The figure-of-merit considering the power, gain, bandwidth, noise factor, and linearity improved by 6 in comparison with that of the conventional 0.13-mm CMOS type.
Vortex Cavitation from Baffle Plate and Pump Vibration in a Double-Suction Volute Pump
Sato, Toshiyuki,Nagahara, Takahide,Tanaka, Kazuhiro,Fuchiwaki, Masaki,Shimizu, Fumio,Inoue, Akira Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
This study highlights especially the mechanism of vortex cavitation occurrence from the end of the suction duct in a double-suction volute pump and pump oscillation which causes cavitation noise from the pump. In this study, full 3D numerical simulations have been performed using a commercial code inside the pump from the inlet of suction duct to the outlet of delivery duct. The numerical model is based on a combination of multiphase flow equations with the truncated version of the Rayleigh-Plesset model predicting the complicated growth and collapse process of cavity bubbles. The experimental investigations have also been performed on the cavitating flow with flow visualization to evaluate the numerical results.
Masahiro Inoue,Hisamitsu Ide,Koji Kurihara,Tatsuro Koseki,Jingsong Yu,Toshiyuki China,Keisuke Saito,Shuji Isotani,Satoru Muto,Shigeo Horie 대한비뇨의학회 2012 Investigative and Clinical Urology Vol.53 No.6
Purpose: The purpose of this study was to investigate the clinical and hormonal features of patients with incidentally discovered adrenal adenomas in relation to corticotropin releasing hormone (CRH) testing and the clinical outcome of adrenalectomy. Materials and Methods: Twenty-three consecutive patients with incidentally detected adrenal adenomas were included in this retrospective study. All the patients underwent abdominal computed tomography scans and hormonal assays, including assessment of circadian rhythms of plasma cortisol and corticotropin (adrenocorticotropic hormone, ACTH), a corticotropin stimulation test, and low-dose and high-dose dexamethasone tests. The patients were reevaluated at regular intervals (6, 12, and 24 months) for a median period of 24 months. Subclinical Cushing’s syndrome (SCS) was diagnosed in patients with subtle hypercortisolism who did not present clinical signs of Cushing’s syndrome. Results: We calculated the responsive index (peak value of ACTH in CRH test/baseline value of ACTH in CRH test). Of 23 patients, 6 had Cushing’s syndrome, 8 had SCS, and 9 had a non-functioning tumor. All patients underwent laparoscopic adrenalectomy. Several patients (5 of 6 with Cushing’s syndrome and 2 of 8 with SCS) required cortisol replacement therapy after surgery. The remaining patients required no hormonal replacement after surgery. Those who required hormone replacement had a responsive index of less than 1.2. Those who did not need hormone replacement therapy had a responsive index of more than 2.0. Conclusions: In our limited experience, the responsive index of the CRH test might be a valuable tool for predicting the need for cortisol replacement after surgery in patients with SCS. Purpose: The purpose of this study was to investigate the clinical and hormonal features of patients with incidentally discovered adrenal adenomas in relation to corticotropin releasing hormone (CRH) testing and the clinical outcome of adrenalectomy. Materials and Methods: Twenty-three consecutive patients with incidentally detected adrenal adenomas were included in this retrospective study. All the patients underwent abdominal computed tomography scans and hormonal assays, including assessment of circadian rhythms of plasma cortisol and corticotropin (adrenocorticotropic hormone, ACTH), a corticotropin stimulation test, and low-dose and high-dose dexamethasone tests. The patients were reevaluated at regular intervals (6, 12, and 24 months) for a median period of 24 months. Subclinical Cushing’s syndrome (SCS) was diagnosed in patients with subtle hypercortisolism who did not present clinical signs of Cushing’s syndrome. Results: We calculated the responsive index (peak value of ACTH in CRH test/baseline value of ACTH in CRH test). Of 23 patients, 6 had Cushing’s syndrome, 8 had SCS, and 9 had a non-functioning tumor. All patients underwent laparoscopic adrenalectomy. Several patients (5 of 6 with Cushing’s syndrome and 2 of 8 with SCS) required cortisol replacement therapy after surgery. The remaining patients required no hormonal replacement after surgery. Those who required hormone replacement had a responsive index of less than 1.2. Those who did not need hormone replacement therapy had a responsive index of more than 2.0. Conclusions: In our limited experience, the responsive index of the CRH test might be a valuable tool for predicting the need for cortisol replacement after surgery in patients with SCS.
A Method for Accelerating the Inference Process of FPGA-based LSTM for Biometric Systems
Ukyo Yoshimura,Toshiyuki Inoue,Akira Tsuchiya,Keiji Kishine 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.5
Biometric systems require the regression and classification of biological sensing data, which are both carried out using machine learning. Long short-term memory (LSTM) is one of the most common methods used for regression and classification. We have developed and implemented a low-energy LSTM algorithm for the regression of microwave sensor signals in a small-scale FPGA. Experimental results show that the FPGA-based parallel-pipelined unrolled algorithm can reduce the computation time by 95% compared to an FPGA-based sequential algorithm. In addition, we found that the power consumption can be reduced by 92% and 91% compared to that obtained with a high-end GPU and CPU, respectively.
Dynamic Memory Access Control for Accelerating FPGA-based Image Processing
Kenta Nishiguchi,Toshiyuki Inoue,Rei Yamazaki,Kazunori Ogohara,Akira Tsuchiya,Keiji Kishine 대한전자공학회 2021 Journal of semiconductor technology and science Vol.21 No.1
In an FPGA-based image processing system, memory access plays an important role in increasing the speed of image processing. With the conventional method, the memory access interval for image processing was fixed, which limited the processing speed. In this work, we developed a novel memory access method that dynamically controls the intervals between memory access requests for image processing by monitoring the memory status. We implemented an image processing system with the proposed method and examined its characteristics. The maximum processing speed with the proposed method reached 30.7 fps, which was 1.65 times faster than that of the conventional method.
Koki Mitani,Toshiyuki Takahashi,Shinya Tokunaga,Tomoo Inoue,Ryo Kanematsu,Manabu Minami,Junya Hanakita 대한척추신경외과학회 2023 Neurospine Vol.20 No.4
Objective: The treatment of osteoporotic vertebral compression fractures (OVCFs) is based on their severity; however, an efficient prediction tool is lacking. We aimed to evaluate the validity of the osteoporotic fracture classification (OF classification) and scoring system (OF score) in predicting the treatment strategy for patients with OVCF, defined according to the Japanese criteria. Methods: We retrospectively investigated 487 consecutive patients diagnosed with vertebral body fractures between January 2018 and December 2022. Only patients with their fresh vertebral fracture episode during the study period were included. Patients were classified into 3 groups: conservative treatment, balloon kyphoplasty (BKP), and open surgery. OF classification and OF scores were assessed for each patient. Results: A total of 237 patients with OVCF were included. There were 127, 81, and 29 patients in the conservative, BKP, and open surgery groups, respectively. The OF score was significantly higher in the BKP and open surgery groups than in the conservative group (p < 0.001). Multivariate logistic regression analysis showed that antiosteoporotic drug use, OF classification, progressive deformity, neurological symptoms and mobilization were independent risk factors for operative treatment (all p < 0.001). Receiver operating characteristic analysis showed that the cutoff OF score for operative indication was 5.5, with a sensitivity of 91.9%, specificity of 56.5%, and area under the curve of 0.820 (95% confidence interval, 0.769–0.871). Conclusion: The OF score identified patients who required operative treatment with a high degree of accuracy. This is especially important for ruling out patients who definitely require operative treatment.