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구강 편평 상� 암종의 전이시 발현이 증가된 유전자들의 검색
윤도준,육종인,박상욱 關東大學校 醫科大學 醫科學硏究所 1999 關東醫大學術誌 Vol.3 No.1
We compared the gene expressions in primary and metastic tumor cells derived from two oral squamous cell carcinoma patients. cDNA was synthesized from RNA of primary and metastic tumor cells and amplified with arbitrary primers by polymerase chain reaction. cDNA of increased and decreased gene expression on 6% denaturing polycrylamide gel eletrophoresis was confirmed by dot blot hybridization. We identified 9 cDNAs of increased gene expression and 3 cDNAs of decreased in both merastatic tumor cells. But the gene expression of others was increased or decreased in one of two metastatic tumor cells .These result imply that the pattern of changes of gene expression in metastasis was different in different patients.
Development of the Main Wing Structure of a High Altitude Long Endurance UAV
박상욱,신정우,김태욱 한국항공우주학회 2018 International Journal of Aeronautical and Space Sc Vol.19 No.1
To enhance the flight endurance of a HALE UAV, the main wing of the UAV should have a high aspect ratio and low structural weight. Since a main wing constructed with the thinwalled and slender components needed for lowstructural weight can suffer catastrophic failure during flight, it is important to develop a light-weight airframe without sacrificing structural integrity. In this paper, the design of the main wing of the HALE UAV was conducted using spars which were composed of a carbon– epoxy cylindrical tube and bulkheads to achieve both the weight reduction and structural integrity. The spars were sized using numerical analysis considering non-linear deformation under bending moment. Static strength testing of the wing was conducted under the most critical load condition. Then, the experimental results obtained for the wing were compared to the analytical result from the non-linear finite-element analysis. It was found that the developed main wing reduced its structural weight without any failure under the ultimate load condition of the static strength testing.