• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.2
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• pp.146-156
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• 1998

Thispapr proposes hybrid navigation parameter estimation using sequential aerial images. The proposed navigation parameter estimation system is composed of two parts: relative position estimation and absolute position estimation. the relative position estimation recursively computes the current velocity and absolute position estimation. The relative position estimation recursively computes the current velocity and position of an aircraft by accumulating navigation parameters extracted from two succesive aerial images. Simple accumulation of parameter values decreases reliability of the extracted parameters as an aircraft goes on navigating. therefore absolute position estimation is required to compensate for position error generated in the relative position step. The absolute position estimation algorithm combining image matching and digital elevation model(DEM) matching is presented. Computer simulation with real aerial image sequences shows the efficiency of the proposed hybrial algorithm.

• Journal of Korean Society of Rural Planning
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• v.27 no.4
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• pp.55-70
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• 2021

In this study, in the field of remote sensing, where the scope of application is rapidly expanding to fields such as land monitoring, disaster prediction, facility safety inspection, and maintenance of cultural properties, monitoring of rural space and surrounding environment using UAV is utilized. It was carried out to verify the possibility, and the following main results were derived. First, the aerial image taken with an unmanned aerial vehicle had a much higher image size and spatial resolution than the aerial image provided by the National Geographic Information Service. It was suitable for analysis due to its high accuracy. Second, the more the number of photographed photos and the more complex the terrain features, the more the point cloud included in the aerial image taken with the UAV was extracted. As the amount of point cloud increases, accurate 3D mapping is possible, For accurate 3D mapping, it is judged that a point cloud acquisition method for difficult-to-photograph parts in the air is required. Third, 3D mapping technology using point cloud is effective for monitoring rural space and rural resources because it enables observation and comparison of parts that cannot be read from general aerial images. Fourth, the digital elevation model(DEM) produced with aerial image taken with an UAV can visually express the altitude and shape of the topography of the study site, so it can be used as data to predict the effects of topographical changes due to changes in rural space. Therefore, it is possible to utilize various results using the data included in the aerial image taken by the UAV. In this study, the superiority of images acquired by UAV was verified by comparison with existing images, and the effect of 3D mapping on rural space monitoring was visually analyzed. If various types of spatial data such as GIS analysis and topographic map production are collected and utilized using data that can be acquired by unmanned aerial vehicles, it is expected to be used as basic data for rural planning to maintain and preserve the rural environment.

• Natural Product Sciences
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• v.6 no.4
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• pp.189-192
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• 2000

A new isoflavone, $(+)-4'-O-methyl-8-C-{\beta}-D-glucopyranosylgenistein$, was isolated from the aerial parts of Spartidium saharae together with the known isoflavone, $(+)-8-C-{\beta}-D-glucopyranosylgenistein$ as well as dipiperidine alkaloids, (+)-ammodendrine and (+)-N-acetyl hystrine. Details of their structure elucidation are based on chemical and spectroscopic methods. N-formyl ammodendrine was detected by GC-MS. The potential chemotaxonomic value of the alkaloid content is explored. Cytotoxic activity has been determined for both alcoholic extract and isolated compounds.

• Natural Product Sciences
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• v.11 no.1
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• pp.41-44
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• 2005

Chemical investigation of the aerial parts of Chloranthus japonicus Sieb. led to the isolation a new compound, 9-hydroxy heterogorgiolide (1) and $isofraxidin-7-O-{\beta}-D-glucopyranoside$ (2), the isolation of which is reported for the first time from this plant, along with the known components, ${\beta}-sitosterol,\;{\beta}-sitosterol-3-O-{\beta}-D-glucopyranoside$, palmitic acid and octacosanoic acid. The structures of compound 1 and 2 were determined on the basis of spectroscopic data including two dimensional NMR and high resolution MS.

• Archives of Pharmacal Research
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• v.26 no.7
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• pp.521-525
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• 2003

Phytochemical works on the aerial parts of Aster oharai (Compositae) led to the isolation of a new sesquiterpene hydroperoxide, 7$\alpha$-hydroperoxy-3, 11-eudesmadiene (2) and seven known compounds, teucdiol B (1), $\alpha$-spinasterol (3), oleanolic acid (4), $\alpha$-spinasterol 3-Ο-$\beta$-D-glucopyranoside (5), methyl 3,5-di-Ο-caffeoyl quinate (6), 3,5-di-Ο-caffeoylquinic acid (7), 3,4-di-Ο-caffeoylquinic acid (8). The chemical structures of 1-8 were established by chemical and spectroscopic methods. Compound 2 showed cytotoxicity against cultured human tumor cell lines in vitro, SK-OV-3 (ovarian), SK-MEL-2 (skin melanoma), and HCT15 (colon) with $ED_{50}$ values ranging from 3.86-17.21 $\mu$g/mL.

• Natural Product Sciences
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• v.14 no.2
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• pp.86-89
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• 2008

Phytochemical study of the aerial parts of Lotus lalambensis Schweinf resulted in the isolation and identification of two new flavonol glycosides; kaempferol $3-O-(5"-acetyl)-apioside-7-O-{\alpha}-L-rhamnopyranoside$ (1) and kaempferol $3-O-{\alpha}-[{\beta}-D-xylosyl-(1""{\rightarrow} 2")-L-rhamnopyranoside]-7-O-{\alpha}-L-rhamnopyranoside$ (2). Structures were determined utilizing different physical, chemical, spectroscopic data including 2D-NMR experiments and HRFABMS.

• Natural Product Sciences
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• v.21 no.2
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• pp.71-75
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• 2015

In this study, phytochemical investigation on the aerial parts of Bupleurum falcatum resulted in the isolation of fourteen compounds including three quinic acid derivatives (1 - 3), five flavonoids (4 - 8), three monoterpene glycosides (9 - 11), and three saikosaponins (12 - 14). Compound 1 was first isolated from nature and unambiguously determined to be 3-O-feruloyl 5-O-caffeoylquinic acid on the basis of the extensive spectroscopic evidence. Biological testing revealed that saikosaponin A (12) and saikosaponin D (13) showed moderate antiproliferative effects on HL-60 and HepG2 cancer cell lines.

• Natural Product Sciences
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• v.11 no.4
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• pp.196-198
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• 2005

Four ursane type triterpenes have been isolated from the methanolic extract of the aerial parts of Agrimonia pilosa Ledeb. (Rosaceae) through repeated silica gel and reverse-phase C-18 column chromatography. Their chemical structures were elucidated as ursolic acid (1), pomolic acid (2), tormentic acid (3), and corosolic acid (4) on the basis of their MS, $^1H-$, and $^{13}C-NMR$ spectral data. Compounds 2 and 4 were isolated from the genes of Agrimonia for the first time.

• Natural Product Sciences
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• v.6 no.1
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• pp.11-15
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• 2000

Two soyasaponins were isolated from the aerial parts of Astragalus tribuloides Del. Their structures were established on the basis of spectroscopic and chemical methods. In addition, ursolic acid, ${\beta}-sitosterol\;{\beta}-D-glucoside$ and isorhamnetin 3-O-glucoside were isolated and identified by comparing their mp, spectral and chromatographic data with those of authentic samples. This is the first report of screening and isolation of the chemical constituents of this species of genus Astragalus.

• Archives of Pharmacal Research
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• v.15 no.4
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• pp.365-370
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• 1992

Seven flavonoids were isolated from the aerial parts of Lonicera japonica. Their structures were characterized as hydnocarpin 1, quercetin 2, ochnaflavone 3, ochnaflavone 4'-O-methylether 4, astragalin 5, isoquercitrin 6, and rhoifolin 7 by chemical and spectroscopic evidences.