Publications by authors named "H Koshida"
Article Synopsis
- The study introduces robust design methods for a vertical avalanche photodiode-based CMOS image sensor, focusing on three practical factors: eliminating guard rings for better pixel isolation, ensuring device performance is stable regardless of voltage and temperature changes, and maintaining consistent operation under intense light conditions.
- The design minimizes trade-offs between electric field concentration and pixel isolation, validated through both simulations and experiments, resulting in effective optimization strategies.
- A global feedback resistor is used to stabilize device characteristics, while an in-pixel overflow transistor improves resistance to high illumination; the sensor's robustness is confirmed by extensive testing on multiple chips under extreme conditions for over 1000 hours.
We have developed an experimental and analytical setup for thermal desorption spectroscopy of solid water films on surfaces. We obtain the coverage-dependent desorption kinetics of water molecules from a well-defined ultra-thin alumina/NiAl(110) surface in the coverage range of 0-2 monolayers. We use a novel deconvolution technique to eliminate the pumping delay of water vapor in the vacuum system, which has previously hindered the accurate estimation of desorption kinetic parameters, such as activation energy and pre-exponential factor.
View Article and Find Full Text PDFRegulation of the Hippo pathway via phosphorylation of Yorkie (Yki), the homolog of human Yes-associated protein 1, is conserved from to humans. Overexpression of a non-phosphorylatable form of Yki induces severe overgrowth in adult fly eyes. Here, we show that mRNA associates with microsomal fractions and forms foci that partially colocalize to processing bodies in the vicinity of endoplasmic reticulum.
View Article and Find Full Text PDFThe formation of (NO)3 on Cu(111) was recently reported based on scanning tunneling microscopy observations [A. Shiotari et al., J.
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