Tokyo Stock Exchange Inc. President and CEO Koichiro Miyahara resigned on Monday to take responsibility for a system failure in October that caused an unprecedented full-day trading suspension at the bourse.His resignation was announced just after Japan's financial watchdog issued a business improvement order to Tokyo Stock Exchange and its parent company.With the order, the Financial Services Agency added to pressure on the bourse operator and its owner, Japan Exchange Group Inc., to take steps to restore international trust following the Oct. 1 disruption, the worst in the history of the …READ FULL ARTICLE