2 Members of AST Research Board of Directors Resign : Technology: Firm has had turnover among executives as financial losses have mounted.

Turnover in the leadership ranks at AST Research Inc. continued Thursday as the Irvine-based computer manufacturer announced the resignation of two members of its board of directors.

The financially struggling company said directors Delbert W. Yocam, 51, and Noh Byung Park, 40, had resigned and would not be replaced.

Yocam, former president of Tektronix Inc., had served on AST’s board since 1992. His resignation, for personal reasons, created an imbalance in the makeup of the board that led to the departure of Park, AST said.

Following Samsung Electronics Inc.’s purchase of 40% of AST in July for $378 million, the board had consisted of seven AST-appointed directors and six installed by Samsung. When Yocam resigned, the number of AST-appointed directors and number of directors installed by Samsung were equal, a condition not permitted under the terms of the deal between the two companies. Park, a Samsung executive elected to the board just two months ago, resigned to preserve the balance.

The resignation of the two board members follows a series of executive departures at AST over the past two weeks. On Wednesday, AST’s head of worldwide manufacturing, Kirby Coryell, resigned to take a job with NEC Corp. in Mountain View.

Last week, AST announced the resignations of three top executives, including board member and President James Schraith. The company said it plans to fill the board vacancy created by Schraith’s departure.

AST reported a loss of nearly $100 million in the fiscal year that ended July 1 and has warned that it expects to lose more than $40 million this quarter.