Itaru Mimura

Flexible service creation node architecture and its implementation

With the spread of always-on forms of broadband-access, such as ADSL and FTTH, new content-delivery services have appeared. However, conventional network nodes are not capable of providing rapid content provision, because they have poor scalability and a lack of reliability. We propose a flexible service-creation node architecture, based on the following concepts. Scalability is achieved by inserting multiple functionally identical service modules into extensible function blocks; new functions are easily added by inserting modules with the appropriate new functionality, and a failure occurring in one module does not affect the other modules because they all work independently. A prototype system shows that this modular node architecture is effective in terms of performance scalability, functional flexibility, and reliability.

New scanning method with variable field frequency for solid state TV camera.

固体テレビカメラのS/N改善を目的とした新しい走査方式を検討した.本方式は, 被写体の動きを検出し, 動きに応じて動解像度と感度を最適化する方式である.今回, 動き検出用の走査と, 蓄積時間を可変し感度を調節する走査を1枚の固体撮像素子に行わせる方式を考案した.MOS型撮像素子を用いた実験カメラにより素子の動作を確認し, 本カメラの可能性を示した.