Co/Nb 이중층 구조의 RTA처리에 따른 층역전 현상을 이용하여 CoSi2를 형성하였다. 중간에 삽입된 Nb층은 산화성향이 매우 커서 Si와 Co의 균일한 반응을 방해하는 Si 기판 표면의 산화막을 충분히 제거해 줄 수 있을 뿐만아니라 Co 의 실리사이드화 반응시에 Co와 결합하여 안정한 화합물을 형성해서 기판 Si의 과잉 소모를 막아 줌으로써 실리사이드화 반응을 제어하는 역할을 하는 것으로 나타났다. Co/Nb이중층 구조를 800˚C에서 열처리하여 얻은 최종 구조는 NB2O5/Co2Si.CoSi/NbCox/Nb(O,C)/CoSi2/Si으로 이층들간의 역전과 안정한 CoSi2상의 형성은 비교적 고온인 약 700˚C부터 시작되었으며, 전 열처리 온도구간에서 Nb의 실리사이드가 발견되지 않았는데, 이러한 점들은 모두 Nb 산화물이나 Co-Nb합금층과 같은 매우 안정한 중간 구조상들이 Co와 Si의 원활한 이동을 제한하기 때문으로 보인다.

This study presents the characteristics of nocturnal inversion layer and their effect on the concentration variations of surface air pollutants using tethersonde and automatic weather station (AWS, 2 layer tower) system in Ulsan during 2003. The method for the distinction of inversion intensity was decided based on the sum of nocturnal temperature gradient. As the results, there was a close correlation (correlation coefficient of 0.76) between the maximum inversion height obtained from tethersonde and the sum of nocturnal temperature gradient. The air pollutant concentration was also directly proportional to the inversion intensity. When the inversion intensity was strong in the nighttime, ozone (O3) concentration was lower, while nitrogen dioxide (NO2) concentration was higher. The carbon monoxide (CO) concentration was gradually higher according to the nocturnal inversion intensity, whereas sulfur dioxide (SO2) concentration was relatively constant. In addition, we found that there was no correlation between the inversion intensity and TSP concentration.

Using measured data at Daegu by tethersonde for the period of 1984～1987, we have investigated the lower atmospheric boundary layer structure including relationships between inversion layer and meteorological factors(wind and temperature), and the inversion strength and inversion height. The inversion layer was defined from the vertical temperature profile and its strength was analyzed with the wind shear as well as the vertical temperature gradient. From October to January, measured inversion layer isn't destroyed, however, in June, after sun rise, it is destroyed by surface heating and mixed layer is developed from surface. According to Pasquill stability classes, the moderately stable cases dominated. It's the larger vertical temperature gradient, the lower SBL height. We have introduced B(bulk turbulence scale) which indicated SBL height. It's larger B, the higher SBL height and vice versa. It was noted that the bulk turbulence scale (B) is appropriate to determine the stable boundary layer height.

Meteorological measurements were carried out in the basin of Cheong-Kwan located Yang-San near Pusan city, from Oct. 30 to Nov. 1, 1988. According to the measured data, we verified the close relationship between the variation of nocturnal inversion layer and the meteorological elements. The nocturnal inversion layer by radiative cooling in this site extends up to 130 meters or so. And the nocturnal jet appears just above or at the top of the inversion layer, and the stronger of the prevailing wind blows, and the lower of the jet level appears. Some meteorological features such as heating, cooling etc., began to change in or in the slightly higher level of the inversion layer, when they are formed, reinforced and disappeared. And the air in the basin preserves its character because it is not affected by local scale air flow.

The field observation was carried out to investigate the characteristics of surface inversion layer at Kimhae using the feild observed data and upper layer meteorological data during 4-5 February 1993. The results of the study can be summarized as follows: The maximum height of surface inversion layer observed at Kimhae is 194m and the height of upper level inversion layer ranges from 200m to 300m. The surface weather elements was influenced the formation of surface inversion layer. According to the pasquill stability and time variation of temperature with height, both the surface heating from insolation and the disturbance of upper level of inversion layer was influenced the disappearance of inversion layer. And the stability of surface temperature inversion layer generally belongs to the class of F, that of upper level temperature inversion layer commonly to the class of E.