In 1997, Dr. James Chien-Min Sung patented the technology of making diamond tools according to a predetermined pattern. The optimization of this pattern may double the tool life and the cutting speed. In 1998, Sung also made DiaGrid® saw segments that showed superior performance in cutting granite and marble. In 2000, Sung visited Shinhan and introduced them this revolutionary concept of diamond saw segments. In 2005, Shinhan adapted the idea and produced saw segments with diamond grits set in a predetermined pattern, their results confirmed that the sawing speed and the sawing life were both improved over conventional designs.

The premiums on closed-end country funds tend to move in tandem, but do not move together with premiums on domestic closed-end funds. After controlling for foreign maket fundamentals, changes in the stock price of country funds co-move with U.S. market returns, but changes in their net asset values do not. An index of changes in country fund premiums explains cross-sectional stock returns in the U.S. market, particularly for small firms. Collectively, these findings suggest U.S. stock prices are affected by market-wide sentiments which are reflected in closed-end country fund premiums.