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Classication of fNIRS Data Using an Articial Neural Network for Image Sequence Recognition
Sei Takahashi,Nagako Saito,Hideo Nakamura,Hitoshi Tsunashima 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We describe classication of functional near-infrared spectroscopy (fNIRS) data acquired during finger tapping and motor imagery tasks performed by a human subject, using an articial neural network for image sequence recognition. Our goal is to develop a brain-computer interface. We used an fNIRS system to collect neural information from brain activity. For discrimination of fNIRS data, we used our previously proposed neural network model called the Neocognitron-type Image Sequence Recognition Model (Neo-ISRM), which is suitable for multichannel temporal patterns. Finger tapping and its motor imagery were used as the motion and mental tasks to be discriminated using Neo-ISRM. The model gave good discrimination results for each category of tasks.
Multichannel Temporal Data Classification of Motor Imagination Using fNIRS
Sei Takahashi,Hideo Nakamura,Hitoshi Tsunashima 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
We describe classification of functional near-infrared spectroscopy (fNIRS) data acquired during finger tapping imagery tasks performed by a human subject, using an artificial neural network designed for image sequence recognition. Our goal is to develop a brain-computer interface that can handle various intentions of users. We used an fNIRS system to collect neural information from brain activity. For discrimination of the fNIRS data, we used our previously proposed neural network model called the Neocognitron-type Image Sequence Recognition Model (Neo-ISRM), which is suitable for analyzing multichannel temporal patterns. Finger tapping imagery of both left and right hands was used as the mental tasks to be discriminated with Neo-ISRM. The model gave good discrimination results for each category of tasks from data for the motor area, the prefrontal area, and the frontal lobe. In all experiments, we confirmed that the discrimination results for the frontal lobe had fewer discrimination errors compared with the results for both the motor and prefrontal areas.
Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura,Satoshi Nishida,Ryo Ishikawa 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we propose a new modulation method combining code-division multiple access (CDMA) and quadrature amplitude modulation (QAM), called CDMAQAM. It transmits QAM symbols allocated based on a CDMA signal, and it has the benefit that QAM errors can be recovered if they are in a range where they can be absorbed by CDMA demodulation. We applied the method to railway signaling and developed a CDMA-QAM rail transmission system having a transmission speed of 1500 bps using digital signal processors. We also conducted a field experiment using an actual rail and verified that the system can achieve favorable constellation characteristics.
Development of a Multi-Channel Processing Matched Filter Using FPGA for CDMA-QAM Method
Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura,Satoshi Nishida,Ryo Ishikawa 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
At present, we attempt to apply our proposed CDMA-QAM method to railway signaling, and evaluate basic characteristics using computer simulation. In this paper, we describe development of a multichannel processing matched lter as a CDMA receiver. We noted that Walsh code is 1 or -1, and proposed the design that has no multipliers. In addition, we applied some techniques such as time-sharing processing, and optimized the design to reduce number of logic elements that an FPGA has. As a result, we show that we could implement the multi-channel processing matched lter in an FPGA.
Analysis of Revision Surgery of Microsurgical Lumbar Discectomy
Taku Inada,Sei Nishida,Taigo Kawaoka,Toshiyuki Takahashi,Junya Hanakita 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.1
Study Design: A retrospective study. Purpose: Our objectives were to determine the association between the pathological changes of disc herniation and the interval between primary and revision surgeries and to investigate the frequency and site of the dural laceration in the primary and revision surgeries. Overview of Literature: Among 382 patients who underwent microsurgical lumbar discectomy, we investigated 29 who underwent revision surgery to analyze recurrent herniation pathologies and complications to determine the manner in which lumbar disc herniation can be more efficiently managed. Methods: Of 29 patients, 22 had recurrent disc herniation at the same level and site. The pathological changes associated with compression factors were classified into the following two types depending on intraoperative findings: (1) true recurrence and (2) minor recurrence with peridural fibrosis (>4 mm thickness). The sites of dural laceration were examined using video footage and operative records. Results: The pathological findings and days between the primary and revision surgeries showed no statistical difference (p =0.14). Analysis of multiple factors, revealed no significant difference between the primary and revision surgery groups with regard to hospital days (p =0.23), blood loss (p =0.99), and operative time (p =0.67). Dural lacerations obviously increased in the revision surgery group (1.3% vs. 16.7%, p <0.01) and were mainly located near the herniated disc in the primary surgery group and near the root shoulder in the revision surgery group, where severe fibrosis and adhesion were confirmed. To avoid dural laceration during revision surgery, meticulous decompressive manipulation must be performed around the root sleeve. Conclusions: We recommend that meticulous epidural dissection around the scar formation must be performed during revision surgery to avoid complications.
Formal Analysis of Automatic Train Protection and Block System for Regional Line Using VDM++
Guo Xie,Xinhong Hei,Hiroshi Mochizuki,Sei Takahashi,Hideo Nakamura 한국철도학회 2012 International Journal of Railway Vol.5 No.2
This paper introduced a novel railway system, Automatic Train Protection and Block (ATPB) briefly, which is proposed to improve the efficiency of existing regional train lines with low cost in Japan. The biggest superiority of ATPB system is a great use of universal and mature technologies, such as GPS and regular mobile telephone networks, so that there is nearly no increment of trackside equipments in the reconstruction. Then in order to guarantee the system safety, a formal model of ATPB is established and analyzed by formal method VDM++. Firstly, the specification is specified by VDM++ formally without ambiguity. Secondly, its internal consistency is proved by discharging the proof obligations. And finally, its satisfiability is checked by systematic testing, which executes specification and checks the outputs against corresponding inputs.