Since maize (Zea mays L.) originated in central and south America, it requires warm climate conditions throughout its growing season. Growth halts when night-time temperatures drop below 10℃, and the plant may die if temperature reach -1.7℃. Thus, temperature should be maintained between 10 and 30℃ from seeding to maturity. The germination temperature for maize should be at least 8-11℃, whit an optimal range 32-34℃. Since temperature significantly affects the germination rate and period, it plays a crucial role in maize growth. In this study, we evaluated the quantity and feed value of 11 major varieties to determine those best suited for maize cultivation as feed in higher latitude, specifically in Democratic People’s of Republic of Korea, below 38 degrees north. A cultivation test was also conducted in Suwon in Republic of Korea, to assess adaptability in areas south of Mt. Suyang. Among the varieties tested, Shinhwangok2 reached silking the fastest, in 65 days, while Gwangpyeongok took the longest at 75 days. The stem length of all varieties exceeded 230 cm. Gwangpyeongok had the tallest stems, while Daanok and Shinhwangok2ho displayed the highest ear ratios. Dacheongok presented the highest values in both dry matter and TDN quantity, with 31,420 kg/ha and 21,66 kg/ha respectively. Pyeonggangok had the highest crude protein content at 8.0%. TDN (%) ranged from 57-68%, with Hwangdaok reaching up to 68%. Based on these findings, Dacheongok and Pyeonggangok appear to be the most suitable varieties for cultivation in terms of both quantity and feed value.

중위도 기압골과 태풍 이동속도와의 상호작용에 대한 예측에서 한국기상청 전구자료동화예측시스템(GDAPS) 모델 바이어스 경향을 알아보기 위해 태풍 산바 사례가 선정되었다. 이 연구는 태풍 분석 및 예측 시스템(TAPS) 및 기상정보시스템-3(COMIS-3)에 저장된 태풍자료로부터 2012년 9월 15일 00UTC로 초기화 된 한국 기상청 GDAPS 분석장과 예측장을 사용하였다. 먼저 해면기압장은 500 hPa 제트구역과 연관하여 중위도 하층 저기압이 발생됨을 보여주었다. 이후 태풍 산바가 중위도 지역으로 들어온 후, 태풍의 이동속도가 증가될 것이라 예측되었다. 특히, 태풍 산바가 9월 17일 00UTC와 06UTC에 전향을 할 시점에 태풍 산바는 중위도 기압골 전면에서 중위도 서풍대와 상호작용을 하였다. 반면, 기상청 GDAPS 해면기압 예측장은 하층 중위도 저기압의 강도를 분석장보다 약하게 예측하였다. 결국 태풍 산바의 이동속도에 영향을 주는 중위도 순환은 분석장보다 느리게 나타났다. 이 순환은 500 hPa에서 제트가 약화됨으로서 증명되었다. 이런 이유로, 기상청 GDAPS 예측장은 태풍 산바가 중위도 기압골과 상호작용함으로써 느린 이동속도의 바이어스를 나타내었다.

We carried out CO survey toward IR-excess clouds using SRAO 6-m telescope in search of molecular H2. These clouds, which show far-infrared excess over what is expected from HI column density, are considered to be candidates of molecular clouds. In order to find new high Galactic latitude clouds, we made mapping observations for 14 IR-excess clouds selected from Reach et al.(1998) in 12CO J = 1 - 0 line, supplementing the similar survey in southern hemisphere (Onishi et al. 2001). 12CO emission is detected from three IR-excess clouds among 14 objects. Three newly detected clouds exhibit somewhat clumpy morphology and column densities amount to ~ 1021 cm-2. One of three clouds, DIR120-28, show discrepancy between IR-excess center and CO emission center. It seems that IR-excess may not be an effective tracer of molecular gas. Instead, optical depth(τ) excess, i.e., IR-excess corrected for temperature dependence, may be more effective tracer of molecular clouds, since, by combining statistics from both hemispheres, we found that the detection rate is higher for IR-excess clouds with lower dust temperature.

We have mapped 1 deg2 region toward a high latitude cloud MBM 40 in the J = 1 - 0 transition of 12CO and 13CO, using the 3 mm SIS receiver on the 14 m telescope at Taeduk Radio Astronomy Observatory. We used a high resolution autocorrelator to resolve extremely narrow CO linewidths of the molecular gas. Though the linewidth of the molecular gas is very narrow (FWHP < 1 km s-1), it is found that there is an evident velocity difference between the middle upper part and the lower part of the cloud. Their spectra for both of 12CO and 13CO show blue wings, and the position-velocity map shows clear velocity difference of 0.4 km s-1 between two parts. The mean velocity of the cloud is 3.1 km s-1. It is also found that the linewidths at the blueshifted region are broader than those of the rest of the cloud. We confirmed that the visual extinction is less than 3 magnitude, and the molecular gas is translucent. We discussed three mass estimates, and took a mass of 17 solar masses from CO integrated intensity using a conversion factor 2.3 × 10 20 cm -2 (K km s-1)-1. Spatial coincidence and close morphological similarity is found between the CO emission and dust far-infrared (FIR) emission. The ratio between the 100 f.Lm intensity and CO integrated intensity of MBM 40 is 0.7 (MJy/sr)/(K km s-1), which is larger than those of dark clouds, but much smaller than those of GMCs. The low ratio found for MBM 40 probably results from the absence of internal heating sources, or significant nearby external heating sources.

The investigation of the space environment requires the use of experimental and theoretical tools and resources in order to perform the research task. Understanding of these research tools is imperative for proper interpretation of the results. In this paper, we discuss on research tools that are widely used in the field of aeronomy; Fabry-Perot interferometer and Michelson interferometer. These instruments have been used extensively as passive optical devices, spectrally monitoring the natural atmospheric emissions (airglow). This function has made both instruments valuable tools in upper atmospheric studies since they provide the ability to determine the dynamic and thermodynamic properties of the upper atmosphere by monitoring naturally-occuring emission.

본 연구에서는 경위의 TM-1A와 GPS(모델명: 4000SSI, GPS 45 Garmin corporation)를 활용하여 공주대학교 천문대의 위치를 결정하였다. 경위의를 이용한 관측에서는 2개의 별(α Aur, α Boo)을 선정하여 남중시각과 남중고도를 측정한 다음위도와 경도를 얻어내었다. 또 GPS를 이용한 관측에서는 6개의 GPS 위성에서 보낸 자료를 수신하여 위도와 경도를 측정하였다. 공주대학교 천문대의 위치는 경도 127˚8'33'.16 , 위도 36˚ 28'14'.20로 결정되었다.