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Adaptive asymptotically efficient estimation in heteroscedastic nonparametric regression
Leonid Galtchouk,Sergey Pergamenshchikov 한국통계학회 2009 Journal of the Korean Statistical Society Vol.38 No.4
The paper considers some asymptotic properties of the adaptive procedure proposed in authors' paper, 2007, for estimating an unknown nonparametric regression. We show that the procedure is asymptotically efficient for quadratic risk, i.e. the asymptotic quadratic risk of the procedure coincides with the corresponding Pinsker constant provided the sharp lower bound for the quadratic risk over all possible estimators.
Leonid Kostrykin,Claus Rohr,Karl Rohr 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Large-scale image stitching of temporal video data acquired by a small robot can facilitate the inspection process of electric generators, reduce the inspection time, and improve the reliability. However, the image data poses a number of challenges due to the small field of view, lack of distinct texture, specular highlights, and other image artifacts. We introduce a novel image stitching method, which generates composite images of generator wedges from temporal videos using intensity-based registration and non-linear blending. In contrast to previous intensity-based registration approaches, our global method simultaneously exploits the information of all image frames of a video and directly determines the global image translations. We propose a suitable energy function and employ a graph-based method for globally optimal minimization in linear runtime. Regularization is used to exploit physical knowledge about the application domain which improves the robustness. We have applied our approach to temporal video data of rotor wedges and performed a comparison with previous methods. We found that our method yields superior results.
Remote Sensing of Surface Films as a Tool for the Study of Oceanic Dynamic Processes
Leonid Mitnik,Vyacheslav Dubina,Oleg Konstantinov,Vitaly Fischenko,Denis Darkin 한국해양과학기술원 2009 Ocean and Polar Research Vol.31 No.1
Biogenic surface films, which are often present in coastal areas, may enhance the signatures of hydrodynamic processes in microwave, optical, and infrared imagery. We analyzed ERS-1/2 Synthetic Aperture Radar (SAR) and Envisat Advanced Synthetic Aperture Radar (ASAR) images taken over the Japan/East Sea (JES). We focused on the appearance of the contrast SAR signatures, particularly the dark features of different scales caused by various oceanic and atmospheric phenomena. Spiral eddies of different scales were detected through surface film patterns both near the coast and in the open regions of the JES in warm and cold seasons. During field experiments carried out at the Pacific Oceanological Institute (POI) Marine Station ‘Cape Shults’ in Peter the Great Bay, the sea surface roughness characteristics were measured during the day and night using a developed polarization spectrophotometer and various digital cameras and systems of floats. The velocity of natural and artificial slicks was estimated using video and ADCP time series of tracers deployed on the sea surface. The slopes of gravity-capillary wave power spectra varied between −4 and −5. Surface currents in the natural and artificial slicks increased with the distance from the coast, varying between 4 and 40 cm/s. The contrast of biogenic and anthropogenic slicks detected on vertical and horizontal polarization images against the background varied over a wide range. SAR images and ancillary satellite and field data were processed and analyzed using specialized GIS for marine coastal areas. Biogenic surface films, which are often present in coastal areas, may enhance the signatures of hydrodynamic processes in microwave, optical, and infrared imagery. We analyzed ERS-1/2 Synthetic Aperture Radar (SAR) and Envisat Advanced Synthetic Aperture Radar (ASAR) images taken over the Japan/East Sea (JES). We focused on the appearance of the contrast SAR signatures, particularly the dark features of different scales caused by various oceanic and atmospheric phenomena. Spiral eddies of different scales were detected through surface film patterns both near the coast and in the open regions of the JES in warm and cold seasons. During field experiments carried out at the Pacific Oceanological Institute (POI) Marine Station ‘Cape Shults’ in Peter the Great Bay, the sea surface roughness characteristics were measured during the day and night using a developed polarization spectrophotometer and various digital cameras and systems of floats. The velocity of natural and artificial slicks was estimated using video and ADCP time series of tracers deployed on the sea surface. The slopes of gravity-capillary wave power spectra varied between −4 and −5. Surface currents in the natural and artificial slicks increased with the distance from the coast, varying between 4 and 40 cm/s. The contrast of biogenic and anthropogenic slicks detected on vertical and horizontal polarization images against the background varied over a wide range. SAR images and ancillary satellite and field data were processed and analyzed using specialized GIS for marine coastal areas.
Hymenobacter daeguensis sp. nov. isolated from river water
Leonid N. Ten,이연희,이재진,박수진,이승열,박상규,이대성,강인규,정희영 한국미생물학회 2017 The journal of microbiology Vol.55 No.4
A Gram-stain-negative, non-motile, non-spore-forming, rodshaped,aerobic bacterial strain, designated 16F3Y-2T, wasisolated from the Han River, South Korea, and was characterizedtaxonomically using a polyphasic approach. Comparative16S rRNA gene sequence analysis showed that strain16F3Y-2T belonged to the family Cytophagaceae in the phylumBacteroidetes and was most closely related to ‘Hymenobacterterrae’ DG7A (98.01%), H. soli PB17T (97.26%), H. glaciei VUG-A130T (96.78%), H. antarcticus VUG-A42aaT(96.72%), H. ruber PB156T (96.61%), and H. saemangeumensisGSR0100T (95.77%). The G+C content of the genomic DNAof strain 16F3Y-2T was 62.9 mol%. The isolate contained MK-7as the predominant respiratory quinone, and summed feature3 (C16:1 ω7c/C16:1 ω6c; 35.5%), C15:0 iso (16.9%), C16:1 ω5c(10.9%), and C15:0 anteiso (9.9%) as major fatty acids. The majorpolar lipid was phosphatidylethanolamine. Phenotypicand chemotaxonomic data supported the affiliation of strain16F3Y-2T with the genus Hymenobacter. However, strain16F3Y-2T exhibited relatively low levels of DNA-DNA relatednesswith 'H. terrae' KCTC 32554 (44.1%) and H. soli KCTC12607T (24.3%), clearly indicating that the isolate constitutesa new genospecies. Strain 16F3Y-2T could be differentiatedfrom its phylogenetic neighbors on the basis of several phenotypic,genotypic, and chemotaxonomic features. Therefore,strain 16F3Y-2T represents a novel species in the genus Hymenobacter,for which the name Hymenobacter daeguensissp. nov. is proposed. The type strain is 16F3Y-2T (=KCTC52537T =JCM 31654T).
(Leonid N .Ten,(Mee Kyoung Lee,(Mi Ja Lee,(Hoon Park 한국응용생명화학회 2000 Journal of Applied Biological Chemistry (J. Appl. Vol.43 No.4
The ginseng growth-promoting bacterium Pseudomonas fluorescens KGPP 207 synthesized indole-3-acetic acid (IAA) from L-tryptophan, indole-3-pyruvic acid (IPyA), and indole-3-acetaldehyde (IAAId), but not from indole-3-acetamide (IAM) and other intermediates
Leonid N. Ten,Hae-Min Jung,임완택,유순애,이성택 한국미생물학회 2008 The journal of microbiology Vol.46 No.5
A Gram-negative, aerobic, rod shaped, non-spore-forming bacterial strain, designated Dae08^T, was isolated from sediment of the stream near Daechung dam in South Korea, and was characterized in order to determine its taxonomic position, using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strain Dae08^T belongs to the family Xanthomonadaceae of the Gammaproteobacteria, and is related to Lysobacter brunescens ATCC 29482^T (97.3%). The phylogenetic distances from any other species with validly published names within the genus Lysobacter were greater than 3.7%. The G+C contents of the genomic DNA of strain Dae08^T was 69.3 mol%. The detection of a quinone system with Q-8 as the predominant compound and a fatty acid profile with iso-C_15:0, iso-C_17:1 ω9c, iso-C_17:0, iso-C_16:0, and iso-C_11:0 3-OH as the major acids supported the affiliation of strain Dae08^T to the genus Lysobacter. DNA-DNA relatedness between strain Dae08^T and its phylogenetically closest neighbour was 28%. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain Dae08^T (= KCTC 12600^T) should be classified in the genus Lysobacter as the novel species, for which the name Lysobacter daecheongensis sp. nov. is proposed.