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Improvement of a Low Cost MEMS Inertial-GPS Integrated System Using Wavelet Denoising Techniques
Chang Ho Kang,Sun Young Kim,Chan Gook Park 한국항공우주학회 2011 International Journal of Aeronautical and Space Sc Vol.12 No.4
In this paper, the wavelet denoising techniques using thresholding method are applied to the low cost micro electromechanical system (MEMS)-global positioning system(GPS) integrated system. This was done to improve the navigation performance. The low cost MEMS signals can be distorted with conventional pre-filtering method such as low-pass filtering method. However, wavelet denoising techniques using thresholding method do not distort the rapidly-changing signals. They can reduce the signal noise. This paper verified the improvement of the navigation performance compared to the conventional pre-filtering by simulation and experiment.
Chang-Ho Kang,Sang-Hyun Han,Ja-Ryoung Koo,소재성 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.3
In this study, the anti-inflammatory effects of Chrysanthemum zawadskii var. latilobum were evaluated on lipopolysaccharide (LPS)-treated RAW 264.7 macrophages. C. latilobum ethanolic extracts were fractionated sequentially with n-hexane, chloroform, ethyl acetate, and n-butanol. C. latilobum extracts significantly decreased LPS-induced nitric oxide (NO) and prostaglandin E2 (PGE2) production in a concentration-dependent manner. In particular, nhexane soluble fractionates from 95% ethanol of C. latilobum (CLNH, at a concentration of over 20 μg/mL, P < 0.001) strongly inhibited NO and PGE2 synthesis. Consistent with these findings, CLNH reduced the LPSinduced expression of inducible nitric oxide synthase (iNOS) and Cyclooxygenase-2 (COX-2) gene expression. iNOS and COX-2 mRNA expression in LPS-treated RAW cells was tested by using reverse transcription polymerase chain reaction (RT-PCR). These results suggest that C. latilobum may have a strong inhibitory effect against iNOS and COX-2 gene expression and may be useful for reducing the production of inflammatory mediators in chronic diseases and oxidative stress.
In vitro Micropropagation of Water Lettuce (Pistia stratiotes L.) via Direct Organogenesis
Chang Ho Kang,Jae Hyeok Lee,Yeong Min Lee,Chae Oh Lim 경상대학교 농업생명과학연구원 2024 농업생명과학연구 Vol.58 No.2
Water lettuce (Pistia stratiotes L.) is a free-floating perennial herbaceous plant with rosette leaves and a stem. Although this plant multiplies and has adverse effects on aquatic ecosystems, it can be used for biological purification of polluted water and production of valuable substances as a traditional medicine. In this study, we report a protocol to establish an in vitro micropropagation method based on direct shoot organogenesis from stem explants. In media comprising two types of basal medium and different growth regulators, multiple shoot organogenesis was observed on stems. The micropropagation method was most effective on Schenk and Hildebrandt (SH) medium with 1 mg/L indole-3-acetic acid and 2 mg/L 6-benzylaminopurine supplemented with 30 g/L sucrose, on which all explants produced multiple shoots. The shoots rooted spontaneously on solid half-strength Murashige and Skoog (MS) and SH media without growth regulators (1/2MSO and 1/2SHO). However, roots developed more vigorously in liquid media. Regenerated plants colonized and grew more rapidly in SH basal medium than in MS basal medium and produced 6–8 stolons within 2 weeks on 1/2SHO. In summary, we established a method for micropropagation in vitro through direct organogenesis of water lettuce, which shows the potential of water lettuce as a model aquatic plant for phytochemical and pharmacological research.