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- Kazuo Iwama, Hiroki Morizumi
- MFCS
- 2002

We prove a lower bound of 5n − o(n) for the circuit complexity of an explicit (constructible in deterministic polynomial time) Boolean function , over the basis U2. That is, we obtain a lower bound of 5n−o(n) for the number of {and, or} gates needed to compute a certain Boolean function, over the basis {and, or, not} (where the not gates are not counted).… (More)

- T Hirose, H Horiguchi, +4 authors T Sano
- Pathology international
- 1997

This report concerns a 66-year-old man with a melanocytoma arising at the foramen magnum. Magnetic resonance imaging disclosed a well-circumscribed tumor extending from the medulla oblongata to C1 with gadolinium enhancement. A heavily pigmented tumor located under the leptomeninges was removed surgically. Although the patient died 8 months later of renal… (More)

- T Hirose, T Hasegawa, +4 authors M Tsuyuguchi
- Ultrastructural pathology
- 1996

A case is reported of atypical glomus tumor occurring in the posterior inferior mediastinum of a 26-year-old woman complaining of severe back pain. The tumor was composed of atypical small, round tumor cells with scattered mitotic figures. In addition to sheet-like, diffuse proliferation of the tumor cells, some areas of the tumor contained small "glomoid"… (More)

- H Morizumi, K Hizawa, S Nunomura, K Ii
- Acta pathologica japonica
- 1984

Histological and ultrastructural alterations of skeletal muscles in Duchenne muscular dystrophy (DMD) (32 cases) and polymyositis (PM) (33 cases) were compared qualitatively and quantitatively. Regeneration is more numerous in PM than DMD throughout all stages. Stromal fibrosis and hyaline fiber with delta lesion are characteristic for DMD. In the electron… (More)

- Kei Uchizawa, Zhenghong Wang, Hiroki Morizumi, Xiao Zhou
- CATS
- 2013

Let C be a logic circuit consisting of s gates g1, g2, . . . , gs, then the output pattern of C for an input x ∈ {0, 1} is defined to be a vector (g1(x), g2(x), . . . , gs(x)) ∈ {0, 1} of the outputs of g1, g2, . . . , gs for x. For each f : {0, 1} → {0, 1}, we define an f -circuit as a logic circuit where every gate computes f , and investigate… (More)

- F Kaneko, K Takase, K Nishiyama, K Kusaka, H Morizumi, K Matsumoto
- No shinkei geka. Neurological surgery
- 1988

Cases of intraosseous meningioma appear to be very rare. In the present paper, we report such a case and discuss its etiological histogenesis on the basis of a review of 26 cases previously reported. A 71-year-old female was admitted to our department because of a painless mass in the right parietal region. Neurological findings were normal. Plain skull… (More)

- K., K. Hizawa, S. Nunomura, H. Morizumi
- Acta Neuropathologica
- 1984

Studies were made on skeletal muscles obtained by biopsy and autopsy from a 59-year-old man with immunocyte dyscrasia and amyloidosis; he had progressive muscular stiffness with palpable tumors and ϰ-type Bence-Jones protein, but no overt myeloma. Histologically, much amyloid was seen deposited preferentially in the skeletal muscles, especially in the endo-… (More)

- Hiroki Morizumi
- Theor. Comput. Sci.
- 2009

The minimum number of NOT gates in a Boolean circuit computing a Boolean function f is called the inversion complexity of f . In 1958, Markov determined the inversion complexity of every Boolean function and particularly proved that ⌈log 2 (n+ 1)⌉ NOT gates are sufficient to compute any Boolean function on n variables. In this paper, we consider circuits… (More)

- Hiroki Morizumi
- ICALP
- 2009

- Hiroki Morizumi, Genki Suzuki
- ISAAC
- 2008