Korea Advanced Institute of Science and Technology

Hyundai Motor Company

Kia Motors Corporation

Seung Min Ryu

Sae Hoon Kim

Yoo Chang Yang

Sang Mun Chin

Dong Yol Yang

Nam Young Cho

Chong Ryul Lee

Chong K Un

The present invention provides an apparatus and method for manufacturing a metal separator for a fuel cell, which can manufacture large-sized metal separators in large quantities using metal plates such as stainless steel by thermoplastic deformation using an incremental and synchronized rubber molding process.

Method and apparatus for manufacturing metal separator for fuel cell

A local area network system using a code division multiple access method is provided. The system includes a repeater for generating a reference synchronizing signal to synchronize the system, transceivers, connected to the repeater via a sending line and a receiving line, and subscriber units, connected to each transceiver. Each transceiver includes a common synchronizing circuit section for replicating and regenerating a synchronizing signal, as a reference signal, which is equal to the reference synchronizing signal generated by the repeater. Each transceiver also has a transmitter for delaying the synchronizing signal in accordance with the specific number of each subscriber unit and the delay time attributed to the sending and the receiving lines, multiplying the delayed synchronizing signal by the signal obtained by level coding the data sent by the transmitter into M-ary data, and then transmitting multiplied data to the sending line. Moreover, the transceiver has a receiver for delaying a reference synchronizing signal which is generated at the common synchronizing circuit section with the delay time corresponding to the specific number of the receiver, detecting the sent signal which corresponds to the subscriber units of the receiver after providing a correlation value in accordance with the delayed synchronizing signal, and converting the sent signal into original data by integrating the detected signal. Therefore, the users may simultaneously transmit their data over the same transmission lines without collision among their data. Also they may exchange information with each other without a central switchboard.

Local area network system utiliziing a code division multiple access

Growing community of inventors

Daejeon, South Korea

Seung Min Ryu