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We present a method for phase recovery in QAM communication systems based on higher order statistics. Under the assumption that the QAM signals have independent, identically distributed (i.i.d.) in-phase and quadrature components, we derive the relation between the phase error and the fourth-order cumulant of the output. Numerical performance of the(More)
This report concerns immunocytochemical and ultrastructural studies on the basophilic inclusions in two cases of sporadic juvenile amyotrophic lateral sclerosis (ALS). The inclusion had a globular, irregularshaped, or sometimes fragmented appearance. Ultrastructurally, the inclusions consisted mainly of thick filamentous structures associated with granules.(More)
  • H. Kusaka, T. Imai, S. Hashimoto, T. Yamamoto, K. Maya, M. Yamasaki
  • 1988
Ultrastructural features of chromatolytic neurons observed in a sporadic case with amyotrophic lateral sclerosis (ALS) are reported. A 70-year-old woman died of weakness and atrophy of the four limbs, bulbar and facial muscles, and hyperreflexia, of 3 1/2 years' duration. Neuronal loss was marked in the anterior horn of the spinal cord, with degeneration of(More)
  • H. Kusaka, S. Matsumoto, T. Imai
  • 1990
A 36-year-old man developed motor neuron signs consisting of weakness and atrophy of the right upper limb, which progressed to involve the other limbs along with development of upper motor neuron signs including pseudobulbar palsy. He died 8.5 years after onset. Bilateral precentral gyri and putamina were grossly atrophic. In addition to severe degeneration(More)
i. Introduction The study of text understanding and knowlegde extraction has been actively done by many researchers. The authors also studied a method of structured information extraction from texts without a global text analysis. The method is available for a comparatively sbort text such as a patent claim clause and an abstract of a technical paper. This(More)
  • H. Kusaka, T. Imai, S. Matsumoto, H. Ito, M. Yamasaki
  • 1992
A Schwann cell can form only one internode of myelin around an axon. However, we observed the formation by a single Schwann cell of myelin around two axons of different diameters in the sural nerve of a 45-year-old man with mononeuritis multiplex. Schwann cell processes spiraled in the same direction around each axon, forming mesaxons. The findings in this(More)
This pnpr describes n netrt method oj jxlsi-pmcrasing jor chamcfcr mcqnitinn, tuhiclr i~tilizes n nnttirnl Inn-gfinge pmcssing (NLP) s!jsfrm. Qllr method is h s e d on urod rnnirltinp mcfhnri u~hich r~erif~g the ns?tlts oJ chnmcter m q n i t t o n by ttrntchittg them witla dicttnnnry words. The chamctensiics 01 nur rnet!~d nrrr as Jol-lo~us: 1)Thr: tr~orri(More)
  • T. Kubota, H. Kusaka, A. Hirano, J. Llena
  • 1985
A case of herpes simplex encephalitis was investigated at the ultrastructural level. Herpes simplex virions were observed, both in nuclei and perikarya of degenerated cells in the cerebrum. Needle-shaped mineralized precipitates were also present in the disintegrated cells. These mineralized depositions were confined to mitochondria. This finding suggests(More)