Kazumichi Nakayama

Learn More
In this paper, a multilayer neural network is applied to 'Brain Computer Interface' (BCI), which is one of hopeful interface technologies between humans and machines. Amplitude of the FFT of the brain waves are used for the input data. Several techniques have been introduced for pre-processing the brain waves. They include segmentation along the time axis(More)
Retrospective analysis of 15 cases with acute subdural haematoma receiving decompressive hemicraniectomy was carried out in an effort to clarify the beneficial effect and limitation of this operative procedure. The patients in this series were divided into three groups according to postoperative intracranial pressure (ICP). Decompressive hemicraniectomy was(More)
We present here a case of intramedullary- and extramedullary-intradural, dumbbell-shaped schwannoma that developed in the upper thoracic cord in a middle-aged man. Before surgery, the tumor was clearly revealed as a mass with two components, intramedullary and extramedullary, on MRI, and it could be useful for operation. We discuss the possible pathogenesis(More)
Movements of the upper limbs are indispensable for daily activities. Rehabilitation for upper limbs is important for aged people or patients of paralysis caused by stroke. Because of aging of society, the number of stroke patients will increase more in the near future. In recent years, the needs for rehabilitation support systems are increasing, which use(More)
We investigated nine patients with rhabomyosarcoma in the head and neck (6–53 years of age), using CT and MRI. The tumours originated in the paranasal sinuses (3), cheek (2), soft palate (1), orbit (1), sternocostoclavicular muscle (1) and parapharyngeal space (1). The histological subtype was embryonal in five, alveolar in three and pleomorphic in one(More)
We reviewed the MRI of seven patients with syringomyelia associated with surgically proven adhesive spinal arachnoiditis to describe clinical and MRI findings in this condition. Using 0.5, 1.0 or 1.5 tesla units, we obtained sagittal T1- and T2-weighted spin-echo and axial T1-weighted images. Additional sagittal T2-weighted images were obtained without(More)
A 50-year-old male presented with subarachnoid haemorrhage and clipping for a ruptured aneurysm of the right middle cerebral artery, performed in 1990. Subsequent hydrocephalus was treated by insertion of a ventriculo-peritoneal (VP) shunt with a Pudenz medium-pressure valve through a left occipital burr hole. Thereafter he su¤ered repeated cerebrovascular(More)
H. Miao,1 P. Richard,1 Y. Tanaka,2 K. Nakayama,2 T. Qian,1 K. Umezawa,2 T. Sato,2,3 Y.-M. Xu,4 Y. B. Shi,1 N. Xu,1 X.-P. Wang,1 P. Zhang,1 H.-B. Yang,5 Z.-J. Xu,5 J. S. Wen,5 G.-D. Gu,5 X. Dai,1 J.-P. Hu,1,6 T. Takahashi,2,7 and H. Ding1,* 1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences,(More)
Some studies on the superficially infiltrated cancer, namely early cancer, were reported. When the patients had vague sensations referable to the esophagus, X-ray and esophagoscopic examination should be performed actively. Especially in the erosion-forming depressed type of the early cancer the esophagoscopy was most adequate for the exact diagnosis. Some(More)
Due to the nature of waterlogged fields used for rice production, we hypothesized that micro-elevation (micro-relief, micro-topography, or differences in elevation) is an important factor for site-specific management within rice fields. A 0.5-ha transplanted and weed-free paddy field was selected as the observation site, where there was micro-elevation in a(More)