5,206 research outputs found
Part-based Multi-stream Model for Vehicle Searching
Due to the enormous requirement in public security and intelligent
transportation system, searching an identical vehicle has become more and more
important. Current studies usually treat vehicle as an integral object and then
train a distance metric to measure the similarity among vehicles. However,
these raw images may be exactly similar to ones with different identification
and include some pixels in background that may disturb the distance metric
learning. In this paper, we propose a novel and useful method to segment an
original vehicle image into several discriminative foreground parts, and these
parts consist of some fine grained regions that are named discriminative
patches. After that, these parts combined with the raw image are fed into the
proposed deep learning network. We can easily measure the similarity of two
vehicle images by computing the Euclidean distance of the features from FC
layer. Two main contributions of this paper are as follows. Firstly, a method
is proposed to estimate if a patch in a raw vehicle image is discriminative or
not. Secondly, a new Part-based Multi-Stream Model (PMSM) is designed and
optimized for vehicle retrieval and re-identification tasks. We evaluate the
proposed method on the VehicleID dataset, and the experimental results show
that our method can outperform the baseline.Comment: Published in International Conference on Pattern Recognition 201
食源性疾病监测研究进展
Foodborne disease is a global public health problem, which is also a severe challenge in China. Since 1984 WHO defined "foodborne disease"as a professional term, all countries have paid more attention to foodborne diseases monitoring, established and improved the monitoring system. Assessment of burden of foodborne disease, especially the in-depth study of the epidemiological burden and economic burden, has important significance on the prevention and control of foodborne diseases.食源性疾病是全球突出的公共卫生问题,也是中国面临的严峻考验。自1984年世界卫生组织将“食源性疾病”(foodborne disease)一词作为正式的专业术语到现今,各国都越发重视食源性疾病的监测,并且逐步完善监测体系。对监测结果进行评估,尤其对流行病学负担和经济负担的深入研究,将对预防和控制食源性疾病有着重要意义
Waveform-Controlled Terahertz Radiation from the Air Filament Produced by Few-Cycle Laser Pulses
Waveform-controlled Terahertz (THz) radiation is of great importance due to
its potential application in THz sensing and coherent control of quantum
systems. We demonstrated a novel scheme to generate waveform-controlled THz
radiation from air plasma produced when carrier-envelope-phase (CEP) stabilized
few-cycle laser pulses undergo filamentation in ambient air. We launched
CEP-stabilized 10 fs-long (~ 1.7 optical cycles) laser pulses at 1.8 {\mu}m
into air and found that the generated THz waveform can be controlled by varying
the filament length and the CEP of driving laser pulses. Calculations using the
photocurrent model and including the propagation effects well reproduce the
experimental results, and the origins of various phase shifts in the filament
are elucidated.Comment: 5pages, 5 figure
Methological quality of systematic reviews and meta-analyses on acupuncture for stroke: a review of review
Objective:
To assess the methodological quality of systematic reviews and meta-analyses regarding acupuncture intervention for stroke and the primary studies within them.
Methods:
Two researchers searched PubMed, Cumulative index to Nursing and Allied Health Literature, Embase, ISI Web of Knowledge, Cochrane, Allied and Complementary Medicine, Ovid Medline, Chinese Biomedical Literature Database, China National Knowledge Infrastructure, Wanfang and Traditional Chinese Medical Database to identify systematic reviews and meta-analyses about acupuncture for stroke published from the inception to December 2016. Review characteristics and the criteria for assessing the primary studies within reviews were extracted. The methodological quality of the reviews was assessed using adapted Oxman and Guyatt Scale. The methodological quality of primary studies was also assessed.
Results:
Thirty-two eligible reviews were identified, 15 in English and 17 in Chinese. The English reviews were scored higher than the Chinese reviews (P=0.025), especially in criteria for avoiding bias and the scope of search. All reviews used the quality criteria to evaluate the methodological quality of primary studies, but some criteria were not comprehensive. The primary studies, in particular the Chinese reviews, had problems with randomization, allocation concealment, blinding, dropouts and withdrawals, intent-to-treat analysis and adverse events.
Conclusions:
Important methodological flaws were found in Chinese systematic reviews and primary studies. It was necessary to improve the methodological quality and reporting quality of both the systematic reviews published in China and primary studies on acupuncture for stroke
A Novel Uni-Acupoint Electroacupuncture Stimulation Method for Pain Relief
Electroacupuncture stimulation (EAS) has been demonstrated effective for pain relief and treating other various diseases. However, the conventional way of EAS, the bi-acupoint method, is not suitable for basis study of acupoint specificity. Moreover, its operations are inconvenient and difficult to be persevered, especially for long-term, continuous and even imperative treatments. These disadvantages motivate designs of new EAS methods. We present a novel uni-acupoint electrical stimulation method, which is applied at a single acupoint and quite meets the needs of basis study and simpler clinical application. Its pain relief effect has been evaluated by animal tests of Wistar rats. During the experiments, rats were given 30 min 2/100 Hz uni- and bi-acupoint EAS and their nociceptive thresholds before and after EAS were attained by hot-plate test. The analgesic effect was defined as the change of nociceptive threshold and used to evaluate the effectiveness of uni-acupoint EAS for pain relief. The hot-plate test results indicated that analgesic effect of uni-acupoint group was significantly higher than that of the control group and there was no significant difference of analgesic effects between uni- and bi-acupoint EAS. The results suggested that uni-acupoint method was an effective EAS method and had comparable pain relief effect with bi-acupoint method
Population Redistribution among Multiple Electronic States of Molecular Nitrogen Ions in Strong Laser Fields
We carry out a combined theoretical and experimental investigation on the
population distributions in the ground and excited states of tunnel ionized N2
molecules at various driver wavelengths in the near- and mid-infrared range.
Our results reveal that efficient couplings (i.e., population exchanges)
between the ground state and the excited states occur in strong laser fields.
The couplings result in the population inversion between the ground and the
excited states at the wavelengths near 800 nm, which is verified by our
experiment by observing the amplification of a seed at ~391 nm. The result
provides insight into the mechanism of free-space nitrogen ion lasers generated
in remote air with strong femtosecond laser pulses.Comment: 18 pages, 4 figure
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