Tsuguhiro Hirose

Title: The Innovations of Tsuguhiro Hirose

Introduction

Tsuguhiro Hirose is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of technology, particularly in video on demand systems and packet scheduling methods. With a total of 12 patents to his name, Hirose's work has had a lasting impact on the industry.

Latest Patents

One of Hirose's latest patents is a video on demand system that presents users with a selection list of proposed videos for which server and network resources are available to immediately serve the selected video. This innovative system includes one or more hybrid fiber coax access networks connecting set-top units to corresponding head-end units. The head-end unit for an access network is connected to an asynchronous transfer mode wide area network (ATM WAN). A hierarchical system of video servers, including at least one center server and at least one local server or cache node, are also connected to the ATM WAN. When a user wishes to select a video, a service control unit coupled to the ATM WAN generates a selection list of proposed videos for which server and network resources are available to immediately serve the user-selected video. The service control unit determines whether server and network resources are available by sending separate queries to server and network resources management control units. Alternatively, the service control unit may generate the selection list based on whether the probability of a particular video being immediately served is greater than a threshold.

Another notable patent is a method and apparatus for packet scheduling using queue length and connection weight. This packet scheduling scheme is capable of realizing fair scheduling regardless of the weights of connections. A packet scheduler has a plurality of packet queues for temporarily storing entered packets, each of which has a weight set up. The scheduling information management unit manages scheduling information to specify the order to read out packets stored in the packet queues, according to the queue length of each packet queue and the weight set up for each packet queue. This innovation ensures that the processing time required for scheduling remains constant regardless of the number of connections.

Career Highlights

Hirose has worked with notable companies such as Toshiba Corporation and Tokyo Shibaura Electric Co., Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in technology.

Collaborations

Throughout his career, Hirose has collaborated with esteemed colleagues, including Hiroshi Kobayashi