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- 저자 : Menghua Wang (검색결과 3 건)
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Ocean color products from the Korean Geostationary Ocean Color Imager (GOCI).
Wang, Menghua,Ahn, Jae-Hyun,Jiang, Lide,Shi, Wei,Son, SeungHyun,Park, Young-Je,Ryu, Joo-Hyung Optical Society of America 2013 Optics express Vol.21 No.3
<P>The first geostationary ocean color satellite sensor, Geostationary Ocean Color Imager (GOCI), which is onboard South Korean Communication, Ocean, and Meteorological Satellite (COMS), was successfully launched in June of 2010. GOCI has a local area coverage of the western Pacific region centered at around 36N and 130E and covers ~2500 2500 km(2). GOCI has eight spectral bands from 412 to 865 nm with an hourly measurement during daytime from 9:00 to 16:00 local time, i.e., eight images per day. In a collaboration between NOAA Center for Satellite Applications and Research (STAR) and Korea Institute of Ocean Science and Technology (KIOST), we have been working on deriving and improving GOCI ocean color products, e.g., normalized water-leaving radiance spectra (nLw(λ)), chlorophyll-a concentration, diffuse attenuation coefficient at the wavelength of 490 nm (Kd(490)), etc. The GOCI-covered ocean region includes one of the world's most turbid and optically complex waters. To improve the GOCI-derived nLw(λ) spectra, a new atmospheric correction algorithm was developed and implemented in the GOCI ocean color data processing. The new algorithm was developed specifically for GOCI-like ocean color data processing for this highly turbid western Pacific region. In this paper, we show GOCI ocean color results from our collaboration effort. From in situ validation analyses, ocean color products derived from the new GOCI ocean color data processing have been significantly improved. Generally, the new GOCI ocean color products have a comparable data quality as those from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the satellite Aqua. We show that GOCI-derived ocean color data can provide an effective tool to monitor ocean phenomenon in the region such as tide-induced re-suspension of sediments, diurnal variation of ocean optical and biogeochemical properties, and horizontal advection of river discharge. In particular, we show some examples of ocean diurnal variations in the region, which can be provided effectively from satellite geostationary measurements.</P>
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Effects of Surface Energy on the Nonlinear Behaviors of Laminated Nanobeams
Menghua Xu,Baolin Wang,Aibing Yu 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.4 No.1
Using an improved multilayer-beams model, the surface effect caused by surface stress and surface elasticity on mechanical properties of laminated nanobeams in bending, bucking and vibration is incorporated into the nonlinear beam theory. Analytical solutions are obtained to study the influence of surface and interface effects for simply supported boundary conditions. Unlike the deduction of previous beam theory, the theoretical derivation in present work includes the effect of both surface and interface. Numerical cases of double layer and multilayer Nickel-silver laminated beams indicate that the interface effect observably change the elastic behaviour of laminated beams on the nanometer scale, especially for multilayer cases.
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Juan Zhao,Wei Ma,Weizhi Chen,Jie Gao,Chunling Li,Yahong Tong,Qin Zhou,Xiuling Zhao,Menghua Wang,Huan Xiao,Yanrong Jin 한국통합생물학회 2019 Animal cells and systems Vol.23 No.6
Endometriosis (EMs) is one of the most common gynaecological diseases in women of childbearing age. Astrocyte elevated gene-1 (AEG-1) is associated with the invasion, migration, apoptosis and prognosis of various cancers. However, the roles of AEG-1 in EMs and its corresponding molecular mechanism are still unknown. In this study, animal models of EMs were established and mice were divided into two groups (n = 10): Sham group and EMs group. The EMs cells were isolated from EMs model. The AEG-1 gene was knocked down by shRNA, while the SOCS1 gene was knocked down by siRNA. Histological changes, AEG-1 expression in tissues and inflammatory factors level were detected by H&E staining, immunohistochemistry and ELISA, respectively. RTqPCR and western blotting were used to determine the expression level of related proteins. The present study found AEG-1 was up-regulated in the EMs model. Enhanced AEG-1 promoted inflammatory cell infiltration, and elevated the levels of IL-1β, IL-6, and TNF-α in EM group (p < 0.05). Besides, AEG-1 overexpression promoted the expression of NALP3, ASC and Cleavedcaspase- 1, while decreased SOCS1 level (p < 0.05). Decrease of SOCS1 further promoted the formation of NALP3 inflammasome. The inhibitory effect of AEG-1 on SOCS1 was weakened after the addition of MG-132 (p < 0.01). Furthermore, silencing AEG-1 alone increased SOCS1 level, decreased the levels of inflammatory cytokines, thereby inhibited the formation of NALP3 inflammasome. All these results demonstrated that AEG-1 aggravated inflammation via promoting NALP3 inflammasome formation in murine endometriosis lesions.
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