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- Emiko Ishiwata
- Computing
- 2000

- Kazuya UESUGI, Yoshiaki, Emiko ISHIWATA
- 2004

In this paper, we consider the following logistic equation with piecewise constant arguments: dN (t) dt = rN (t){1 − m j=0 a j N ([t − j])}, t ≥ 0, m ≥ 1, m j=0 a j > 0, and [t] means the maximal integer not greater than t. The sequence {N n } ∞ n=0 , where N n+1 = N n exp{r(1 − m j=0 a j N n−j)}, n = 0, 1, 2, · · ·. Under the condition that the first term… (More)

- Isamu Ishiwata, Chieko Ishiwata, +5 authors Hiroshi Ishikawa
- Human cell
- 2005

A cell line designated "HIBSPP" was established from a human malignant choroids plexus papilloma of 29-year-old Japanese woman. This line grew well without interruption for 3 years and was subcultivated over 70 times. The cells were spindle, oval, and polygonal in shape, and neoplastic and pleomorphic features, a jigsaw puzzle-like arrangement,… (More)

- Kazushige Kiguchi, Isamu Ishiwata, +8 authors Hiroshi Ishikawa
- Human cell
- 2005

Human uterine cervical malignant lymphoma (B-cell type) was cultured and the cell line (HIUML) was newly established. The HIUML cells were round in shape and had a tendency to make floating clusters. The cells had a smooth surface or protrusion on the margin of the cytoplasm, and proliferate in floatation. The population doubling time was about 32 hours and… (More)

- Tsubasa Saito, Emiko Ishiwata, Hidehiko Hasegawa
- ICCSA
- 2010

When floating point arithmetic is used in numerical computation, cancellation of significant digits, round-off errors and information loss cannot be avoided. In some cases it becomes necessary to use multiple precision arithmetic; however some operations of this arithmetic are difficult to implement within conventional computing environments. In this paper… (More)

- Tsubasa Saito, Emiko Ishiwata, Hidehiko Hasegawa
- J. Comput. Science
- 2012

To verify computation results of double precision arithmetic, a high precision arithmetic environment is needed. However, it is difficult to use high precision arithmetic in ordinary computing environments without any special hardware or libraries. Hence, we designed the quadruple precision arithmetic environment QuPAT on Scilab to satisfy the following… (More)

- Akiko Fukuda, Yusaku Yamamoto, Masashi Iwasaki, Emiko Ishiwata, Yoshimasa Nakamura
- Numerical Algorithms
- 2012

Based on the integrable discrete hungry Toda (dhToda) equation, the authors designed an algorithm for computing eigenvalues of a class of totally nonnegative matrices (Ann Mat Pura Appl, doi: 10.1007/s10231-011-0231-0 ). This is named the dhToda algorithm, and can be regarded as an extension of the well-known qd algorithm. The shifted dhToda algorithm has… (More)

- Isamu Ishiwata, Chieko Ishiwata, +4 authors Hiroshi Ishikawa
- Human cell
- 2004

We placed on culture the 13 cases of meningiomas, succeeded in making a primary culture of 10 cases and maintained 5 cases in vitro over considerable period of time (over three month), and one cell line derived from a malignant meningioma were established. In the early period of the primary culture, meningioma cells were spindle- or round-shaped cells. In… (More)

- Kensuke Aihara, Kuniyoshi Abe, Emiko Ishiwata
- J. Computational Applied Mathematics
- 2014

- Daisuke Aoto, Emiko Ishiwata, Kuniyoshi Abe
- J. Computational Applied Mathematics
- 2010