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8 results on '"Maeda, Tadashi"'

1. An 0.1-micrometer voidless double-deck-shaped (DDS) gate HJFET with reduced gate-fringing-capacitance

Author

Wada, Shigei, Yamazaki, Jin, Ishikawa, Masaoki, and Maeda, Tadashi

Subjects
Field-effect transistors -- Research, Etching -- Research, Gates (Electronics) -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A novel double-deck-shaped gate technology for 0.1 micrometer heterojunction field-effect transistors (HJFET) based on dry-etching processes was described. The technology used a T-shaped SiO2-opening and gate-metal filling techniques which cuts into half the external gate fringing capacitance of conventional T-shaped gate HJFETs and allows the fabrication of voidless refractory gate-electrodes which ensure high uniformity. The fabricated HJFETs provided higher performance since the technology was based on an all-dry-etching process.

Published
1999

2. 0.2-microm fully-self-aligned Y-shaped gate HJFET's with reduced gate-fringing capacitance fabricated using collimated sputtering and electroless Au-plating

Author

Wada, Shigeki, Tokushima, Masatoshi, Fukaishi, Muneo, Matsuno, Noriaki, Yano, Hitoshi, Hida, Hikaru, and Maeda, Tadashi

Subjects
Field-effect transistors -- Design and construction, Integrated circuit fabrication -- Methods, Cathode sputtering (Plating process) -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

The method used in fabricating a new fully-self-aligned, 0.2-microm, high-aspect ratio, Y-shaped-gate heterojunction-field-effect transistor (HJFET) is presented. Its external gate-fringing capacitance is half of that of existing HJFETs. WSi-collimate sputtering and electroless Au-plating were used in forming the gate electrodes without voids for greater uniformity and reliability. The new HJFET has a small current saturation voltage of 0.25 V, a threshold voltage of 9 mV, a gm(sub max) of 631 mS/mm, an f(sub max) of 120 GHz and a gate-reverse breakdown voltage of -6 V.

Published
1998

3. 0.1-micron p+-GaAs gate HJFET's fabricated using two-step dry-etching and selective MOMBE growth techniques

Author

Wada, Shigeki, Furuhata, Naoki, Tokushima, Masatoshi, Fukaishi, Muneo, Hida, Hikaru, and Maeda, Tadashi

Subjects
Gallium arsenide semiconductors -- Analysis, Crystals -- Etching, Etching -- Methods, Plasma devices -- Analysis, Field-effect transistors -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Pseudomorphic heterojunction-FET's with very short gates are successfully developed through the two-step dry-etching and selective growth MOMBE techniques. The use of the drying technique has reduced gate-openings with a high aspect-ratio of 3.5 in Sio(sub 2) film. While the introduction of the MOMBE growth techniques has completed the filling of the openings with refractory p+-GaAs. This fabrication technology has strong potentials for future high speed applications.

Published
1998

4. An accurate HJFET capacitance-voltage model for implementation with a circuit simulator

Author

Matsuno, Noriaki, Yano, Hitoshi, Hida, Hikaru, and Maeda, Tadashi

Subjects
Field-effect transistors -- Models, Electric circuit analysis -- Models, Business, Electronics, Electronics and electrical industries
Abstract

A new hetero-junction field effect transistor capacitance model for implementation with a circuit simulator is proposed. The analytical model characterizes capacitance-voltage properties over a wide supply voltage range. It considers both the gradual capacitance transition near the threshold voltage and the parasitic metallized semiconductor capacitance at elevated gate voltage.

Published
1997

5. Diagnostic significance of interferon-γ in tuberculous pleural effusions *. (clinical investigation)

Author

Aoe, Keisuke, Hiraki, Akio, Murakami, Tomoyuki, Eda, Ryosuke, Maeda, Tadashi, Sugi, Kazuro, and Takeyama, Hiroyasu

Subjects
Interferon gamma -- Complications and side effects, Tuberculosis -- Diagnosis -- Complications and side effects, Pleural effusions -- Diagnosis -- Complications and side effects, Health, Diagnosis, Complications and side effects
Abstract

Study objectives: Tuberculosis (TB), the single most frequent infectious cause of death worldwide, also is a major cause of pleural effusion, which in TB usually has lymphocytic and exudative characteristics. [...]

Published
2003

6. Pilot study of cyclophosphamide-doxorubicin-vincristine-cisplatin-etoposide hybrid chemotherapy in small cell lung cancer

Author

Ohnoshi, Taisuke, Hiraki, Shunkichi, Ueoka, Hiroshi, Kiura, Katsuyuki, Kamei, Haruhito, Horiguchi, Takashi, Kodani, Tsuyoshi, Maeda, Tadashi, Tabata, Masahiro, Shibayama, Takuo, Segawa, Yoshihiko, Miyatake, Kazuyo, Takigawa, Nagio, and Kimura, Ikuro

Subjects
Chemotherapy, Combination -- Evaluation, Lung cancer, Small cell, Drug resistance -- Research, Cyclophosphamide -- Physiological aspects, Doxorubicin -- Physiological aspects, Vincristine -- Physiological aspects, Cisplatin -- Physiological aspects, Etoposide -- Physiological aspects, Health
Abstract

Background. Small cell lung cancer (SCLC) is highly sensitive to chemotherapy. Despite the introduction of intensive combination chemotherapy, long-term disease-free survivors are still rare. The emergence of drug-resistant tumor cells during chemotherapy is presumed to be the major cause of poor outcome. Methods. A pilot Phase 11 study of hybrid chemotherapy for patients with SCLC was conducted between October 1986 and March 1988. Dose and schedule for each drug in the regimen were as follows: cyclophosphamide, 700 mg/[m.sup.2] intravenously (IV), day 1; doxorubicin, 30 mg/[m.sup.2] IV, day 1; vincristine, 1.4 mg/[m.sup.2] IV, day 1; cisplatin, 60 mg/[m.sup.2] IV, day 8; and etoposide, 100 mg/[m.sup.2] IV, days 8 and 9. Courses were repeated every 4 weeks for up to six cycles. Patients with limited disease (LD) received chest irradiation of 5000 cgy when a maximal response was achieved. Only patients with LD who achieved a complete response (CR) received prophylactic cranial irradiation of 3000 cGy. Results. Thirty-six patients were enrolled and fully evaluated for tumor response and toxicity. All 20 patients with LD responded to the regimen, and 14 (70%) of those achieved a CR. Of 16 patients with extensive disease (ED), 7 CR and 7 partial responses were noted, indicating an overall response rate of 88%. The median survival time was 23.6 months for patients with LD and 12.6 months for those with ED. Myelosuppression was the major toxicity, but it was generally well tolerated. Conclusions. These results indicate that the hybrid regimen is a highly active one for the treatment of patients with SCLC and warrants additional clinical trials. Cancer 1993; 72:1597-601.

Published
1993

7. Soluble receptor-binding cancer antigen expressed on SiSo cells in pleural fluid *: a potential diagnostic marker for malignant pleural effusion

Author

Aoe, Keisuke, Hiraki, Akio, Maeda, Tadashi, Murakami, Tomoyuki, Yamazaki, Koichi, Sugi, Kazuro, and Takeyama, Hiroyasu

Subjects
Lung cancer -- Diagnosis -- Research, Pleural diseases -- Diagnosis -- Research, Health, Diagnosis, Research
Abstract

Background: We sought a marker to differentiate malignant from nonmalignant pleural effusions. Methods: We studied 41 patients presenting with pleural effusions to the National Sanyo Hospital between April 2000 and [...]

Published
2004

8. Comparison of six biological markers for the diagnosis of tuberculous pleuritis *

Author

Hiraki, Akio, Aoe, Keisuke, Eda, Ryosuke, Maeda, Tadashi, Murakami, Tomoyuki, Sugi, Kazuro, and Takeyama, Hiroyasu

Subjects
Health
Abstract

Study objective: We sought a marker to differentiate tuberculous pleural effusions from nontuberculous pleural effusions, which otherwise can be difficult. Patients: We studied 55 patients with pleural effusions, 20 (36%) [...]

Published
2004

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