12,260 research outputs found
American Image of President Park Chung-hee of the Republic of Korea: Park Chung-heeas Death and American Newspapers
No full textSouth Korea s President Park Chung-hee was still a controversial figure in Korean history He was a man who achieved the economic miracle of South Korea while adopting repressive measures to suspend the democracy and human Korea The nostalgia of Park s era also remains Park receives fairly good evaluations from the world American newspapers at the death of Park Chung-hee provided the objective views on Park Chung-hee Throughout the newspapers editorials Park was the man who brought the economic miracle of South Korea and a good ally for the U S at the time of Cold War On the other hand he was another dictator who enjoyed autocratic rule under the U S protection The American views provide the foundation to evaluate Park Chung-hee of toda
Turbulent skin-friction drag reduction by travelling waves induced by spanwise Lorentz force
No full textThe streamwise and spanwise travelling waves induced by spanwise Lorentz force are studied for skin-friction drag reduction in a turbulent channel. The streamwise travelling wave by spanwise Lorentz force on drag reduction is compared to the with the spanwise wall motion. The drag reduction map shows a drag reduction region and a drag increase region, depending on a time scale . For spanwise travelling wave, a large drag reduction appears at large oscillation frequencies and small spanwise wave numbers, while all stationary wave cases give a drag increase. When the wave travels at an oblique angle to the streamwise mean flow, the optimal drag reduction appears in backward travelling wave case. Generally, the backward streamwise travelling wave is found to be most efficient in drag reduction among all oblique travelling waves. Spanwise oscillation, forward streamwise travelling, spanwise travelling and backward streamwise travelling wave cases share a similar drag reduction mechanism: first, the spanwise motion directly breaks the near wall quasi-streamwise vortices structure array \cite{Jeong_etal1997}, which results in the shortening of streamwise streaks; second, the spanwise velocity layer maintains the asymmetry of the positive and negative quasi-streamwise vortices, which leads to a sustained drag reduction
Effectiveness of plant-derived sorbents for the remediation of low-energy intertidal wetlands contaminated by oil spills
No full textThe use of plant-derived sorbent was investigated as a remediation strategy for low-energy intertidal wetlands contaminated by crude oil spills. Effectiveness of plant-derived sorbent as a wicking agent was evaluated in microcosms simulating intertidal wetlands. Microcosms were designed to impose three different oil penetration depths (0.25, 0.5, and 1.0 cm), two different tidal amplitudes (±5 and ±10 cm above oil-contaminated surface), and two different types of sorbents (raw bagasse and hydrophobic-treated bagasse). We observed that the use of plant-derived sorbent was beneficial not only in removing oil but also in preventing further contamination. Oil penetration depth and tidal amplitude both negatively influenced the effectiveness of the sorbent. Effectiveness of the hydrophobic-treated sorbent was always higher than that of untreated one at any given oil penetration depth and tidal amplitude. Effectiveness of hydrophobic-treated sorbent was relatively low compared to that of raw bagasse. The most plausible explanation is that oil wicking mainly occurred during low tide. From a cost-effectiveness point of view, we suggest the use of raw bagasse immediately after an oil spill for remediation of low-energy intertidal wetlands. The observed results imply that this technique has potential to stimulate biodegradation by wicking oil out of contaminated intertidal wetlands subsurface to the aerobic zone where biodegradation can take place. © Springer Science+Business Media B.V. 2012.Adebajo MO, 2003, J POROUS MAT, V10, P159, DOI 10.1023-A:1027484117065; Annunciado TR, 2005, MAR POLLUT BULL, V50, P1340, DOI 10.1016-j.marpolbul.2005.04.043; Bayat A, 2005, CHEM ENG TECHNOL, V28, P1525, DOI 10.1002-ceat.200407083; Bossert I, 1984, PETROLEUM MICROBIOLO, P435; Breitenbeck G. A, 1997, OSRADP TECHNICAL REP, P96; BROTAS V, 1990, HYDROBIOLOGIA, V207, P123, DOI 10.1007-BF00041448; Cheong C. J., 2003, J KOREAN SOC SOIL GR, V8, pp81; Cheong CJ, 2001, WATER SCI TECHNOL, V43, P171; CHOI HM, 1992, ENVIRON SCI TECHNOL, V26, P772, DOI 10.1021-es00028a016; Chung S, 2011, CHEM ENG TECHNOL, V34, P1989, DOI 10.1002-ceat.201100353; Chung S., 2008, P 2008 INT OIL SPILL; Chung S, 2012, J ENVIRON SCI-CHINA, V24, P1371, DOI 10.1016-S1001-0742(11)60955-8; de Silva A. P, 1995, THESIS U LOUISIANA B; de Oteyza TG, 2006, SCI TOTAL ENVIRON, V357, P12, DOI 10.1016-j.scitotenv.2005.04.039; Goodin D. A, 2001, 8 INT PETR ENV C HOU; Lee B. G., 1999, KENAF PROPERTIES PRO, P423; Mitsch W. J, 1986, WETLANDS, P393; Office of Technology Assessment (OTA), 1991, BIOR MAR OIL SPILLS; Purandare J. A., 1999, THESIS U CINCINNATI; Venosa Albert D., 2002, Bioremediation Journal, V6, P261, DOI 10.1080-10889860290777602; Venosa AD, 2003, SPILL SCI TECHNOL B, V8, P163, DOI 10.1016-S1353-2561(03)00019-7; Version 2.0, 1997, NOAA TECHN MEM NOS O; Zhu X, 2001, GUIDELINES BIOREMEDI1
8-Chloro-cAMP inhibits transforming growth factor alpha transformation of mammary epithelial cells by restoration of the normal mRNA patterns for cAMP-dependent protein kinase regulatory subunit isoforms which show disruption upon transformation
No full textDifferential regulation of the regulatory subunits of cAMP-dependent protein kinase isozymes correlates with the growth inhibitory effect of site-selective 8-Cl-cAMP demonstrated in cancer cell lines (Ally, S., Tortora, G., Clair, T., Grieco, D., Merlo, G., Katsaros, D., Ogreid, D., Døskeland, S.O., Jahnsen, T., and Cho-Chung, Y.S. (1988) Proc. Natl. Acad. Sci. U. S. A. 85, 6319-6322). Such selective modulation of protein kinase isozyme regulatory subunits was also found in the 8-Cl-cAMP-induced inhibition of both transformation and transforming growth factor alpha (TGF alpha) production in Ki-ras-transformed rat kidney fibroblasts (Tortora, G., Ciardiello, F., Ally, S., Clair, T., Salomon, D. S., and Cho-Chung, Y. S. (1989) FEBS Lett. 242, 363-367). In this work, we have demonstrated that 8-Cl-cAMP antagonizes the TGF alpha effect in TGF alpha-transformed mouse mammary epithelial cells (NOG-8TFC17) at the level of gene expression for cAMP receptor protein isoforms, RI and RII (the regulatory subunits of protein kinase isozymes). Northern blot analysis demonstrated that in the transformed NOG-8TFC17 cells, compared with the nontransformed counterpart NOG-8 cells, the mRNA levels for the RI alpha cAMP receptor protein markedly increased, whereas the mRNA levels for the RII alpha and RII beta cAMP receptor proteins decreased. 8-Cl-cAMP, which induced growth inhibition and phenotypic reversion in NOG-8TFC17 cells, caused an inverse change in the mRNA patterns of the cAMP receptor proteins; RI alpha cAMP receptor mRNA sharply decreased to levels comparable with that of the nontransformed NOG-8 cells, whereas RII beta mRNA increased to a level even greater than that in the NOG-8 cells. In addition, one mRNA species of RII alpha increased, whereas the other RII alpha mRNA species decreased during the treatment. The mRNA level for the catalytic subunit of protein kinase, however, did not change during 8-Cl-cAMP treatment. In addition, 8-Cl-cAMP brought about a reduction in both TGF alpha mRNA and protein levels. These coordinated changes in the expression of the cAMP receptor proteins and TGF alpha were not observed during cis-hydroxyprolineor TGF beta-induced growth inhibition of the NOG-8TFC17 cells. Thus, the antagonistic effect of 8-Cl-cAMP toward TGF alpha-induced transformation involves modulation of the expression of a specific set of cellular genes
Pseudomonas sp. DJ77에서 클로닝한 glutathione S-transferase의 분리 및 특성 규명
No full text학위논문(석사) - 한국과학기술원 : 생명과학과, 1995.2, [ iii, 45 p. ]A new bacterial glutathione S-transferase phnC gene cloned from Pseudomonas sp. DJ77 was expressed in E. coli. The gene product PhnC was purified by glutathione-affinity chromatography. The results of SDS-polyacrylamide gel electrophoresis and gel permeation chromatography suggested that PhnC was a homo-dimeric protein, Mr of which is 42 kDa. The isoelectric point was 5.8 by isoelectric focusing. These Mr and pI values were similar to Mr (43200) and pI (5.5) predicted from DNA sequence of phnC. Furthermore, nine N-terminal amino acid residues determined by amino acid sequencer were the same as those predicted from DNA sequence. PhnC showed glutathione S-transferase activity toward glutathione and 1-chloro-2,4-dinitrobenzene (CDNB) and the specific activity was 10.6 mol/min/mg. The specific activity was higher than that of any other known bacterial glutathione S-transferase. PhnC was stable below and between pH 6 and pH 9. The highest activity was shown at pH 8.0. An analysis of circular dichroism spectra of PhnC showed that the portions of -helix, -sheet, -turn and random coil structures in PhnC were 6, 13, 22, 49\%, respectively. The portions of secondary structures were somewhat different from those of known bacterial and mammalian glutathione S-transferases. Computer modelling of the inital-rate using nonlinear least-squares regression analysis favored a rapid-equilibrium ordered bi-bi mechanism with CDNB binding first, which was different from the kinetic mechanisms of mammalian GSTs.한국과학기술원 : 생명과학과
A new filter design for airborne disease transmission
No full textSubmission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01The student, Chun-I Chung, accepted the attached license on 2021-12-07 at 01:36.The student, Chun-I Chung, submitted this Thesis for approval on 2021-12-07 at 01:36.This Thesis was approved for publication on 2021-12-07 at 14:12.DSpace SAF Submission Ingestion Package generated from Vireo submission #17207 on 2022-04-06 at 17:16:50Made available in DSpace on 2022-04-29T21:45:53Z (GMT). No. of bitstreams: 2
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Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I OnlyTwo particle filters were designed using a vortex trap concept with equally spaced channels and tortuous airflow paths. A small wind tunnel was built to evaluate the filters’ efficiency under various conditions. Emphasis is placed on the effect of the following parameters, namely, tortuosity, T = 1.3 and 2.0, square conduit size of 0.4 mm and 0.7 mm, and incoming flow velocity U =0.2 m/s and 0.4 m/s. Results show that a particle size on the order of 10 μm passing through a two-layer filter with T = 2 and square-hole size of 0.7 mm width provide 98.5% efficiency
The application of user log for online business environment using content-based Image retrieval system
No full textOver the past few years, inter-query learning has gained much attention in the research and development of content-based image retrieval (CBIR) systems. This is largely due to the capability of inter-query approach to enable learning from the retrieval patterns of previous query sessions. However, much of the research works in this field have been focusing on analyzing image retrieval patterns stored in the database. This is not suitable for a dynamic environment such as the World Wide Web (WWW) where images are constantly added or removed. A better alternative is to use an image's visual features to capture the knowledge gained from the previous query sessions. Based on the previous work (Chung et al., 2006), the aim of this paper is to propose a framework of inter-query learning for the WWW-CBIR systems. Such framework can be extremely useful for those online companies whose core business involves providing multimedia content-based services and products to their customers
Turbulent structures in unsteady wall-bounded flow subject to temporal acceleration
No full textDirect numerical simulations (DNS) of a transient turbulent channel flow subject to constant temporal acceleration have been performed with a final Reynolds number of \Retau=800. The response of turbulent structures to the temporal acceleration is investigated. A significant delay in the response of turbulent flow is observed in various turbulent properties. It is found that the response of turbulent flow to temporal acceleration consists of two stages: the destruction of the initial \emph{old} turbulence, followed by the generation of \emph{new} turbulence associated with a higher number. The \emph{new} turbulence is much stronger than the \emph{old} turbulence
The political role of the people's liberation army 1949-1973
No full textThis thesis is to study the political role of the People's Liberation Army from the approach of structure and function. The framework of the thesis consists of three major parts, first, the influence of Chinese traditional political culture on, and the formation of, the political role of the PL A; second, the influence of domestic political struggles and external military conflicts on the development of the political role of the PLA; and the third, the analysis of the transition of the PLA's political role from the structure and personnel arrangements of the CCPCC Within the above-mentioned three scopes, this thesis make a thorough discussion on the following: (1) The relationship between the structure of the PRC and the formation of the PLA's political role; (2) How has ideology influenced the army's political role; (3) What is Mao's viewpoint and his influence on the development of the army's political role; (4) What is the link between the army and the party, and how has this developed; (6) What accounts for the expansion of the PLA's political functions; (7) What is the influence of political factional struggles on the PLA's political role; (8) Is it political institution or military institution that controls the recruitment of the military elite; (9) What are the disparities between the military elite in handling international conflicts and what are their political considerations; (10) What is the Party's position in the army; (11) How have the Party’s important meetings and personnel arrangements influenced the rise and fall of the PLA's political role
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