Combined epithelial odontogenic tumors are very rare and represent hybrid lesion comprising adenomatoid odontogenic tumor intermixed with calcifying epithelial odontogenic tumor. The authors present 3 cases of combined epithelial odontogenic tumor which contained diagnostic areas for both adenomatoid odontogenic tumor and calcifying epithelial odontogenic tumor. Their behaviour and histogenesis were discussed.

본 연구는 소 난관 상피 세포를 채취 체외 배양을 실시하고, 이에 착상과 관련이 있은 IL-4를 첨가하여 배양액내의 임신에 관련된 호르몬들(P4, E2, TGF-)의 변화를 관찰함으로써, 소 난관 상피 세포와 착상과의 관계를 구명하고자 실시하였으며, 그에 따른 결과는 다음과 같다. 소 난관 상피 세포의 체외 배양시 IL-4 첨가에 의한 배양액내의 P4의 생산은 0.001 ng/ml의 IL-4를 첨가한 배양액의 P4의 농도는 배양 시간이 경과할수록 증가하

Infrared color-color diagram of 10 giant molecular clouds are examined to explore the dust property from the COBE Diffuse Infrared Background Experiment of the 100, 140, and 240μm emission. Four of them, Taurus, Mon OB1, Gem OB1, and Chameleon, show the anti-correlation in R100/140−R140/240 plot and the horizontal distribution in R100/240−R140/240 plot, which disagree with those of theoretical calculation. These could be explained by the depletion of 100μm and the excess of 140μm emission, though no existing dust model could support them. Mean color temperature of the anti-correlation region appears to be lower than that of the linear region, whose temperatures are 15.3, 17.0 K, respectively. And the linear region shows large dispersion in the plot of intensity relation. Both imply that a star formation would be more active, but not homogeneous, in the linear region compared to the anti-correlation region.

This present study borrows the framework of action research as a tool for improving the quality of instruction in a university reading comprehension course by reflecting previous and current teaching practices, by incorporating students’ feedback and preferences, and by intervening students’ beliefs and strategy use. In doing so, the study examines the potential effects and problems of strategy-based instruction in the reading comprehension tasks that integrate TETE in collaborative, task-based learning environment. The students were assigned to the training of two different types of strategies in terms of language processing: paraphrasing vs. translation strategies in a TETE class. A total of 107 students from two reading comprehension courses were asked to take a TOEFL and answer a self-report questionnaire both at the beginning and at the end of the semester. While students’ use of metacognitive and cognitive strategies increased significantly, their use of translation strategies and beliefs about translation were persistent to change as the students seemed to regard translation an important tool for reading comprehension. A follow-up interview and course evaluation were also used for triangulating the quantitative findings. It is suggested that the role of L1 in language classes should be revisited and the English-only policy be reconsidered.

The purpose of this study was to investigate the antioxidative effect and quality characteristics of cookies made with Sea tangle powder(STP). The cookies were at 30℃ for 45 days. The 3% STP had higher pH value compared to the other groups and control. As more STP was added, the L-value and b-value decreased, and the a-value increased for the color values. The results of sensory evaluation and acceptance test showed that the cookies with 3% STP was significantly more preferable in overall acceptability than the others. The acid value, peroxide value, and thiobarbituric acid value were lower in cookies with 3% and 6% STP than in those cookies made 9% STP and the control cookies.

The damage aspects of soybean by common cutworm, Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) at different larval density and different growth stage of soybean were studied in soybean field. The percent yield reduction(Y) of soybean infested by different densities of S. litura (X, no. of larvae/plant) under outdoor conditions for a three week period were estimated by the following equations: (1) Y = 1.655X - 6.025 (R² = 0.952) for the R1 (flowering stage), (2) Y = 0.725X - 0.475 (R² = 0.986) for the R3 (beginning pod stage), and (3) Y=0.635X - 1.325 (R² = 0.986) for the R5 (beginning seed stage). Based on the relationships between the densities of S. litura larvae and the yield index of soybean, the number of larvae (2nd-3rd instar) which caused 5% loss of yield (Tolerable injury level) was estimated to as approximately 6.7 for the R1, 7.5 for the R3, and 10.0 per plant for the R5, respectively. Average soybean leaf areas consumed by 1st, 2nd, 3rd, 4th, 5th and 6th larvae of Spodoptera litura during 24 hr at 28℃ was 0.3, 0.7, 2.6, 4.0, 20.1, and 55.8 ㎠, respectively.

본 논문은 자이로콥터의 유한요소 모델링과 로터의 회전에 의한 동하중을 고려한 전산진동해석을 수행하였다. 이를 위해 자이로콥터의 최종 조립된 3차원 CATIA 모델을 구축하였으며, 3차원 데이터를 바탕으로 비구조 질량을 포함한 구조진동해석을 위한 유한요소모델을 생성하였다. 실용적인 전산구조동역학 해석을 위해 상용 유한요소 해석프로그램인 MSC/NASTRAN과 자체 개발한 프로그램을 병용하여 사용하였다. 비행 중 회전하는 로터에 의해 발생하는 동하중은 상용 CFD 프로그램인 FLUENT를 이용하였다. 유체해석과 구조진동해석의 결합을 위해 자체적으로 통합 연계 시스템을 구축하였다. 3차원 구조의 효율적인 진동특성을 고찰하기 위해 모달영역에서 천이응답해석과 주파수응답해석을 수행하였다. 실제 자이로콥터의 연료조건과 비행조건을 고려하였으며, 전산해석을 통하여 고유진동, 주파수 응답 및 천이응답 특성을 고찰하였다.

근래에 들어서 사회적 및 경제적인 요구에 의하여 건축구조물이 점차 고층화 및 대형화됨에 따라서 다양한 형식의 구조시스템이 연구 및 개발되고 있다. 비교적 최근에 개발된 초대형 골조시스템은 초대형부재의 조합으로 횡방향 강성을 충분히 발휘함으로써 초고층건물에 적합한 구조시스템으로 인식되고 있다. 그러나 이러한 초대형 골조시스템을 적용한 건물의 거동을 예측하기 위해서는 매우 많은 수의 절점과 요소로 이루어진 유한요소 모델을 해석해야 하므로 상당한 양의 해석시간과 엔지니어의 노력이 필요하게 된다. 따라서 본 연구에서는 초대형 골조시스템 전용 해석프로그램을 개발하여 초대형 골조구조물의 해석과 설계에 소요되는 시간과 노력을 줄이고자 한다. 이를 위하여 초대형 골조구조물의 특징을 활용한 효율적인 모형화기법과 행렬응축기법을 사용하여 해석에 사용되는 자유도수를 최소화도록 만든 해석모델이 개발되었다. 예제구조물의 해석을 수행하여 본 연구에서 개발된 프로그램을 사용한 결과와 일반적인 해석방법에 의한 결과와 비교함으로써 개발된 프로그램의 효율성과 정확성을 검증하였다.