The board shall elect one of its members chairman, who shall serve for one year or until he is re-elected or his successor is elected and qualified. The board shall appoint a secretary who may be an officer of the governing authority or of the zoning board. The board shall adopt rules of procedure in accordance with the provisions of an ordinance adopted pursuant to this chapter. Meetings of the board must be held at the call of the chairman and at such other times as the board may determine. Public notice of all meetings of the board of appeals shall be provided by publication in a newspaper of general circulation in the municipality or county. In cases involving variances or special exceptions conspicuous notice shall be posted on or adjacent to the property affected, with at least one such notice being visible from each public thoroughfare that abuts the property. The chairman or, in his or her absence, the acting chairman, may administer oaths and compel the attendance of witnesses by subpoena. The board shall keep minutes of its proceedings, showing the vote of each member upon each question, or if absent or failing to vote, indicating that fact, and shall keep records of its examinations and other official actions, all of which must be immediately filed in the office of the board and must be a public record.