The Sensex at the Bombay Stock Exchange rose 84 points, or 0.5 percent, to 18,793, today, on fresh hopes of more economic reforms. The Sensex had lost about 350 points in the previous two trading sessions. The Nifty at the National Stock Exchange climbed 29 points, or 0.5 percent, to 5,705.Stock markets in Japan, China, Hong Kong, South Korea and Singapore ended mixed.