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저차 크로스모드를 고려한 단순지지 사각 접수 평판의 방사효율해석
김현실(Kim, Hyun-Sil),김재승(Kim, Jae-Seung),김봉기(Kim, Bong-Ki),김상렬(Kim, Sang-Ryul),이성현(Lee, Seong-Hyun) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.8
In this paper, radiation efficiency of the plate surround by an infinite rigid baffle is studied. The plate is simply supported and one side is in contact with air, while other side with water. The pressure and normal velocity over the plate surface are assumed as modal summations, from which a set of linear equations is obtained for fluid-structure coupled problem. It is shown that neglect of the cross modes results in overestimation of the radiation efficiency specifically for mid-frequency ranges. Based on the fact that the responses are mainly determined from the first few cross modes in addition to the diagonal terms, a new algorithm is proposed, where banded matrix is iteratively solved in computing radiation efficiency. In numerical examples, it is found that radiation efficiency obtained from banded matrix is in excellent agreement with the one from the full matrix, while computing time is significantly reduced. It is also found that as frequency grows larger, radiation efficiency considering only diagonal terms is a good approximation.
유전자 재조합 B 형 간염 바이러스 표면 항원 , CJC-50100 의 일반약리작용
정성학(Seong Hak Jeong),최재묵(Jae Mook Choi),이남중(Nam Jung Lee),전형수(Hyung Soo Jeon),김연희(Yon Hee Kim),김재승(Jae Seung Kim),하석훈(Suk Hoon Ha),김영훈(Young Hoon Kim),이나경(Na Gyung Lee),김제학(Je Hak Kim),박완제(Wan Je Park 한국응용약물학회 2001 Biomolecules & Therapeutics(구 응용약물학회지) Vol.9 No.1
N/A CJC-50100 is a recombinant hepatitis B virus surface antigen (HBsAg) expressed in yeast. The general pharmacological properties of CJC-50100 were evaluated in mice, rats, dogs and isolated guinea pig ileum. The doses were 0.33∼33.3 ㎍/㎏ i.m. for mice and rats and 3.3∼9.9 ㎍/㎏ i.v. for dogs. The concentrations of 0.002∼0.02 ㎍/mlwere used for the assay with guinea pig ileum. Intramuscular administration of CJC-50100 at the doses did not alter general behavior and the responses for central nervous system, smooth muscle, gastrointestinal system, cardiovascular and respiratory system, and water and electrolytes excretion. In summary, CJC-50100 had no pharmacological effect in these studies even up to the 100-fold of the expected clinical dose, 20 ㎍/man/60 kg.
김현실(Kim, Hyun-Sil),김상렬(Kim, Sang-Ryul),김재승(Kim, Jae-Seung),김봉기(Kim, Bong-Ki),이성현(Lee, Seong-Hyun) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.11
Sound attenuation of periodically arranged cylindrical rods is studied numerically and experimentally. Cross section of the cylinder is circular and arrays are in a square lattice. Cylinders are made of steel, and consist of five groups with different diameters from 27.2 mm to 48 mm. Each group has 5 rows, while number of cylinders in a row varies from 17 to 31. The area filling fraction is about 60~61 %, which leads to the stop bandgap(2.9 kHz ~ 8.4 kHz). Sound attenuation is computed using two-dimensional BEM, and measurement is done by using a speaker and microphones in a semi-anechoic room. Comparison of the results by BEM and experiment shows that attenuation spectra are qualitatively in agreement, although experiment gives higher attenuations than BEM. After results by BEM are scaled up in accordance with cylinder diameter, it is observed that attenuation curves are in good agreement, which confirms that analysis by BEM is done correctly. It is also found that the measured bandgaps are shifted toward lower frequency by 0.5 kHz ~ 1.2 kHz, when compared to the predictions obtained from infinitely repeated two-dimensional cylinder arrays.