본 논문에서는 이동물체에 의해 가진 받는 보의 동적반응을 보다 용이하게 다룰 수 있는 간결한 수치해석 알고리즘을 제안하였다. 구조물과 이동물체를 각각 균일한 Euler보와 질점으로 모델링하여 보의 운동방정식을 유도하였으며 이 식을 유연영향함수를 이용하여 적분형 미분방정식으로 바꾸어줌으로써 수치해석에 적용할 수 있는 형태로 바꾸어 주었다. 유도된 운동방정식을 모우드 해석기법을 이용하여 수치해를 구하였으며 기존의 수치해석 연구결과들과 비교하여 본 연구결과의 타당성을 검증함으로써 본 연구에서 개발한 수치해석 알고리즘은 이동물체에 의해 가진받는 보의 초기 해석과 설계과정에서 효율적으로 사용할 수 있음을 보였다.

An attempt has been made to analyze time series of Hα, Hβ, and Hɤ line profiles taken from a 3B/X6.1 flare which occurred on Oct. 27, 1991 in an active region, NOAA 6891. A total of 22 sets of Hα, Hβ, and Hɤ taken with a low and non-uniform time resolution of 10-40 seconds were scanned by PDS with absolute intensity calibration to derive the physical characteristics of the material in the flare chromosphere. Our . results are as follows: (1) The lower Balmer lines observed during the flare activity are broadened by Stark effect. (2) At the peak of the flare activity, the electron temperature of the Balmer line emitting region reaches up to 35000K and its geometrical thickness increases to a scale of ~104km, suggesting that high energy particles penetrate deep into the photospheric level.

감쇠재료인 점탄성재료는 여러 산업현장에서 발생하는 소음 및 진동문제를 해결하기 위하여 널리 쓰이고 있다. 기존의 진동감쇠 제어기술을 이용하여 이러한 문제를 성공적으로 해결하기 위해서는 먼저 제어하고자 하는 구조물에 적용될 점탄성재료의 진동감쇠 특성이 명확히 규명되어야 한다. 따라서 본 연구에서는 1)우리의 일반적인 실험실 환경에서 모우드해석법을 통해 점탄성재료의 진동감쇠특성을 측정할 수 있는 실험이론과 기법을 정립하고 2)제한된 환경(온도 및 주파수)에서 얻어진 실험 데이타를 이용하여 reduced-frequenct-nomogram(RFN)을 그릴 수 있는 전산프로그램을 개발하였으며 또한 RFN으로부터 확보한 점탄성재료의 진동감쇠특성을 이용하여 감쇠처리된 구조물의 진동해석을 수행하였다.

거대한 평판형 격자구조물올 연속체 평판으로 모델링하기 위한 보다 용이한 기법올 에너지동둥 개 념에 근기 하여 제시하였다. 단위 격 자가 갖 는 탄성변형에너지와 운동에너지를 구 할때 기폰의 유한요소 행렬을 이용하였다. 연속체 평 판의 퉁 가불성치 는 연속체평판과 격자평판에 해당하는 축소된 강성 및 질 량행 렬들 올 직 접 비 교 하여 구하였다- 본 연구에서 제안된 모 델링기법이 기존의 잘 알려진 기볍들에 옷지 않는 좋 은 결 과를 보여주고 있음을 예제해석을 통해 확인하였다.

In the present study a two-mode, separately concurring resonant cavity model is proposed for theoretical interpretation of the 3 minute umbral oscillation. The proposed model has been investigated by calculating the transmission coefficients of the waves propagating through the umbral photosphere (photospheric weak-field cavity) and chromosphere (chromospheric strong-field cavity) into the corona, for 3 different umbral model atmospheres by Staude (1982), Beebe et al. (1982) and Avrett (1981). In computing the transmission coefficients we made use of multi-layer approximation by representing the umbra] atmosphere by a number of separate layers with (1) temperature varying linearly with depth and (2) temperature constant within each layer. The medium is assumed to be compressible, non-viscous, perfectly conducting under gravity. The computed resonant periods, transmission spectra, phase spectra, and kinetic energy density of the waves associated with the oscillations are presented in comparison with the observations and their model dependent characteristics are discussed.

Making use of the arbitrary shock theory developed by Ulmschneider (1967, 1971) and Ulmschneider and Kalkofen (1978), we have calculated the dissipation rates of upward-travelling slow-mode acoustic shock waves in umbral chromospheres for two umbral chromosphere models, a plateau model by Avrett (1981) and a gradient model by Yun and Beebe (1984). The computed shock dissipation rates are compared with the radiative cooling rate given by Avrett (1981). The results show that the slow-mode acoustic shock waves with a period of about 20 second can heat the low umbral chromospheres travelling with a mechanical energy flux of 2.6 × 10 6 e r g / c m 2 s at a height of 300 ∼ 400 k m above the temperature minimum region.

Background : There are about 30 species of Adenophora triphylla which grow wild in Korea. but they are very similar so that it is difficult to distinguish with the naked eye. Therefore, it is separated by conformational differences such as leaf shape and flower size. However, these morphological distinction is not useful because even in the same type there are differences by a growth phase or the environment. It is difficult to identify and classify Adenophora triphylla because the phenotypes between plant individuals are diverse greatly even within the same type. For this reason, we will investigate the flowering characteristics of Adenophora triphylla and this information will be used as the basis for the breeding line. Methods and Results : We used the second year Adenophora triphylla in Herbal Crop Research Division, Department of Herbal Crop Research in Eumseong. We Investigated flowering characteristics from June 2015 to November 2015. The 34 individuals of 134 individuals were died by pests and diseases. Depending on the flowering and fruition characteristics were classified into 5 populations, except for the early and late maturing individuals. Conclusions : The flowering period of Adenophora triphylla is 1 month from mid-July to mid-August, and it takes 15 days from the flowering season to the 70% of flowering. It usually takes about 60 days from flowering to fruition, and the fruition is finished in mid-October.