250 research outputs found
Drive Video Analysis for the Detection of Traffic Near-Miss Incidents
Because of their recent introduction, self-driving cars and advanced driver
assistance system (ADAS) equipped vehicles have had little opportunity to
learn, the dangerous traffic (including near-miss incident) scenarios that
provide normal drivers with strong motivation to drive safely. Accordingly, as
a means of providing learning depth, this paper presents a novel traffic
database that contains information on a large number of traffic near-miss
incidents that were obtained by mounting driving recorders in more than 100
taxis over the course of a decade. The study makes the following two main
contributions: (i) In order to assist automated systems in detecting near-miss
incidents based on database instances, we created a large-scale traffic
near-miss incident database (NIDB) that consists of video clip of dangerous
events captured by monocular driving recorders. (ii) To illustrate the
applicability of NIDB traffic near-miss incidents, we provide two primary
database-related improvements: parameter fine-tuning using various near-miss
scenes from NIDB, and foreground/background separation into motion
representation. Then, using our new database in conjunction with a monocular
driving recorder, we developed a near-miss recognition method that provides
automated systems with a performance level that is comparable to a human-level
understanding of near-miss incidents (64.5% vs. 68.4% at near-miss recognition,
61.3% vs. 78.7% at near-miss detection).Comment: Accepted to ICRA 201
A simple procedure to determine Ca2+ in oxygen-evolving preparations from Synechococcus sp
AbstractA simple procedure to determine Ca2+ bound to low- and high-affinity sites of Synechococcus oxygen-evolving particles was developed. The method consists of determination of Ca2+ in the particle suspensions with and without treatment with a chelating resin, Chelex 100, to remove the metal cations contaminating the suspension medium as well as those weakly bound to the particles. It was found that the particles contain one tightly bound Ca2+ per PS II reaction center which cannot be extracted with Chelex 100 and a larger amount of weakly associated and resin-extractable Ca2+
Changes in the Ecosystem of Lake Suwa Attendant upon Human Activities
Article信州大学理学部付属諏訪臨湖実験所報告 5: 107-116(1984)departmental bulletin pape
Tolerance to freezing stress in cyanobacteria, Nostoc commune and some cyanobacteria with various tolerances to drying stress
Tolerance to and effects of the freezing stress in a desiccation-tolerant, terrestrial cyanobacterium, Nostoc commune, in cultivated strains of N. commune, and in desiccation-sensitive species, Synechocystis sp. PCC6803 and Fischerella muscicola, were studied by measuring their photosynthetic activities and fluorescence emission spectra. The results showed that a strain or species with higher desiccation tolerance was more tolerant to freezing stress than one with lower desiccation tolerance, which is consistent with the idea that tolerance to freezing stress is related to resistance to drying stress. Under freezing conditions, light energy absorbed by photosystem (PS) II complexes was dissipated to heat energy in N. commune, which may protect the cells from photoinactivation. N. commune encountered cellular dehydration due to ice formation outside the cell under freezing conditions. But NMR data showed that relatively high amounts of water still remained in a liquid state inside the cells at -36_C when N. commune colonies were fully wetted before freezing. High PSI activities measured by P700 photooxidation also support the result that non-freezing water remains within the cells. Besides, 5% methanol enhanced the resistance to freezing stress in the sensitive species. This effect seems to be related to maintenance of the PSI activity and pigment-protein complexes in their functional forms by methanol
X-ray Anomalous Scattering of Diluted Magnetic Oxide Semiconductors: Possible Evidence of Lattice Deformation for High Temperature Ferromagnetism
We have examined whether the Co ions crystallographically substitute on the
Ti sites in rutile and anatase Ti_{1-x}_{x}_{2-delta}K_{1-x}_{x}_{2-delta}_2_{1-x}_{x}$O thin films and
obtained direct evidence that the Co ions are indeed substituted on the Zn
sites.Comment: 5 pages, 4 figures, accepted in PR
Efficient generation of highly squeezed light and second harmonic wave with periodically poled MgO:LiNbO_3
We report on effective generation of continuous-wave squeezed light and
second harmonics with a periodically poled MgO:LiNbO (PPMgLN)
crystal which enables us to utilize the large nonlinear optical coefficient
. We achieved the squeezing level of dB at 860
nm by utilizing a subthreshol optical parametric oscillator with a PPMgLN
crystal. We also generated 400 mW of second harmonics at 430 nm from 570 mW of
fundamental waves with 70% of conversion efficiency by using a PPMgLN crystal
inside an external cavity.Comment: 4 pages, 3 figure
Ycf12 is a core subunit in the photosystem II complex
AbstractThe latest crystallographic model of the cyanobacterial photosystem II (PS II) core complex added one transmembrane low molecular weight (LMW) component to the previous model, suggesting the presence of an unknown transmembrane LMW component in PS II. We have investigated the polypeptide composition in highly purified intact PS II core complexes from Thermosynechococcus elongatus, the species which yielded the PS II crystallographic models described above, to identify the unknown component. Using an electrophoresis system specialized for separation of LMW hydrophobic proteins, a novel protein of ∼5 kDa was identified as a PS II component. Its N-terminal amino acid sequence was identical to that of Ycf12. The corresponding gene is known as one of the ycf (hypothetical chloroplast reading frame) genes, ycf12, and is widely conserved in chloroplast and cyanobacterial genomes. Nonetheless, the localization and function of the gene product have never been assigned. Our finding shows, for the first time, that ycf12 is actually expressed as a component of the PS II complex in the cell, revealing that a previously unidentified transmembrane protein exists in the PS II core complex
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