The winners of the 2010 Yonsei Univeristy Research Scholar Awards in the natural sciences are Professor Kim Dong-Ho (Chemistry) and Professor Kim Sang-Hyo (Civil Engineering). Established in 1968, the Yonsei Univeristy Research Scholar Awards are presented to outstanding faculty members from each of the five fields: humanities, social sciences, fundamental sciences, applied sciences and medicines. Professor Kim Dong-ho’s Research “Möbius aromaticity and antiaromaticity in expanded porphyrins” In his paper “Möbius aromaticity and antiaromaticity in expanded porphyrins”, Professor Kim Dong-ho has discovered and examined various Möbius aromatic expanded porphyrins and their photophysical properties. While the concept of Möbius aromaticity was suggested theoretically in 1964, almost 50 years ago, stable Möbius aromatic molecules have not been found or synthesized. Determined to solve this problem, Professor Kim has recently examined Möbius aromatic expanded porphyrins realized by a number of methods, including (1) metalation, (2) temperature control, (3) protonation and (4) ring-fusion reaction. His findings have been published in a series of papers in prominent international journals such as Nature Chemistry, Journal of the American Chemical Society and Angewandte Chemie International Edition. Acknowledged for the scientific progress in the field of Möbius aromaticity, his studies have been selected as the cover article in journal, editorial news and Hot Paper. Professor Kim has also received numerous invitations to give presentations on this topic at various international conferences. Professor Kim Sang-hyo’s Research “An Analytical investigation of thermal prestressing method for continuous composite girder bridges” In most civil and building structures, thermal responses due to the temperature change in structural members and the temperature gradient in member sections are assumed to cause negative effects on structural behavior. In his study “An Analytical investigation of thermal prestressing method for continuous composite girder bridges”, Professor Kim Sang-hyo proposed an innovative design and construction method called the thermal pre-stressing method (TPSM) which can use these thermal behaviors and prestresses in order to improve structural behavior. By using the induction heater, TPSM adapts the thermal prestressing forces in the various shape steel members and the flat steel plates very efficiently. Illustrative applications of TPSM include 1) suppressing the slab cracks and improvement of behavior of internal support sections in continuous composite girder bridges, 2) strengthening/prestressing of steel/concrete girders and slab, 3) repairing and reinforcing various structures, and 4) key-segment closing method for partially earth-anchored long-span cable-stayed bridges. Further research on TPSM is continuously being conducted for practical applications in various civil and building structures.