ϱ 1992 47 (UN)ȸ ų 3 22 , 츮 1995 ų İ δ縦 ϰ ִ.
츮 ϳ , ڿ ΰ Բ ̸, ̴ (UN) ϼ, ʴ ̵(Groundwater ; Making the invisible visible) ϼ ǥ Ͽȭ ̷ Ȱϰ ϴ ִ.
ֽô Ŀ ȫ ϰ 6 ǥâѴ. δδ ȯ ȸ õ ȭȰ ִ.
ƿ ġ ü ķ, Ʒ, ȯȭȰ ǽ ȹ̴.
ۿ ȯå ¾ ùε ǿ ʿ伺 ϰ, å 븦 ϱ ٶ١ ȯ ȸ ȯ õ ° Ƹ ȭ ù е Ź帰١ ߴ.
ȣ hoahn01@hanmail.net