Traffic Danger Recognition With Surveillance Cameras Without Training Data

We propose a traffic danger recognition model that works with arbitrary traffic surveillance cameras to identify and predict car crashes. There are too many cameras to monitor manually. Therefore, we developed a model to predict and identify car crashes from surveillance cameras based on a 3D reconstruction of the road plane and prediction of trajectories. For normal traffic, it supports real-time proactive safety checks of speeds and distances between vehicles to provide insights about possible high-risk areas. We achieve good prediction and recognition of car crashes without using any labeled training data of crashes. Experiments on the BrnoCompSpeed dataset show that our model can accurately monitor the road, with mean errors of 1.80% for distance measurement, 2.77 km/h for speed measurement, 0.24 m for car position prediction, and 2.53 km/h for speed prediction.Comment: To be published in proceedings of Advanced Video and Signal-based Surveillance (AVSS), 2018 15th IEEE International Conference on, pp. 378-383, IEE

Low pressure chemical vapor deposition of silicon nitride films from ditertiarybutylsilane

In this study amorphous stoichiometric silicon nitride films were synthesized by low pressure chemical vapor deposition (LPCVD) using DTBS (ditertiarybutylsilane) and ammonia (NH3). The growth kinetics were determined as a function of temperature in the range of 600-900 00, pressure in the range of 0.2-1.1 Torr, DTBS flow rate in the range of 10-50 sccm, and NH3/DTBS flow ratio in the range of 5-20. At constant condition of pressure (0.5 Torr), DTBS flow rate (10sccm) and NH3 flow rate (100 sccm), the deposition rate of as-deposited silicon nitride films was found to follow an Arrehnius behavior in the temperature range of 600-700 °C with an activation energy of 50.0±0.2 kcal mol-1. The film characterizations including physical, compositional, structural, optical and mechanical properties were determined by using Nanospec Interferometry, XPS, RBS, X-ray diffraction, FTIR, UV Visible, Ellipsometer, and Nano Instrument Indenter. The obtained results demonstrated the feasibility of using DTBS in the synthesis of high quality silicon nitride films by LPCVD. Furthermore, some advantages of DTBS over traditional precursors were found and thus indicated that high quality amorphous silicon nitride films can be obtained from DTBS-NH3 precursor system using LPCVD by optimizing the film synthesis conditions

Adaptive receivers for direct-spread and multi-carrier code division multiple access systems

In this thesis, the detection of Direct Sequence Code Division Multiple Access (DS-CDMA) signals in an AWGN channel and Multi-Carrier (MC) CDMA signals in a time-dispersion channel is discussed. The DS-CDMA receiver employs an adaptive multiuser interference canceler that utilizes deadzone limiters in the tentative decision stage. With weights adjusted adaptively, the prior knowledge of signal powers is unnecessary. The steady state error performance of this receiver is obtained and found to be superior to the performance of the same receiver using hard limiters for tentative decisions. The channel is considered non-fading in. this receiver. Modeling the frequency selective channel lading as narrowband fiat-flat fading centered at each subcarrier, the MC-CDMA technique reduces the effect of channel dispersion. A decorrelating multiuser interference canceler is introduced in the MC-CDMA receiver to reduce the multi-access interference, especially when the orthogonality of signature codes is degraded by the fading channel

The Spirit of Humanistic Care in Alice Munro’s Dear life

Dear Life is considered to be Munro’ s last work, which Munro said was “the first, last, and most intimate words” about her life. This work not only takes women as the protagonists, grabs the fragments of women’s life to observe their living conditions and explores their rich inner world, but also creates a large number of male images with marginal status, vague identity, passive behavior and even subordinate to women. These men no longer represent the traditional powerful patriarchy and the supreme male power. Instead, they display anxiety about their own masculinity and their male submissive identity, thus presenting a crisis of masculinity and gender paradox. Whether in her description of the plight of women’s survival or in her portrayal of male images losing their subject identity, Munro, in this work, manages to express a humanistic concern for human nature. From the perspective of her understanding of women and her care for men, this paper will discuss Munro’s spirit of humanistic care in Dear life.

Functional Studies of the Recombinant Subunits of a Cytolethal Distending Holotoxin

Cytolethal distending toxin (CDT) is a multicomponent bacterial holotoxin that targets most eukarytotic cells causing distension and cell cycle arrest. A number of diverse pathogenic bacterial species associated with diarrhoea, chancroid, chronic hepatitis and periodontal disease produce a CDT. Synthesis of the holotoxin is directed by the expression of three genes, cdtA, cdtB and cdtC. Although the product of the CdtB gene was previously identified as a type I deoxyribonuclease, the functions of the cdtA and cdtC products have not been characterized. Using the periodontal pathogen, Actinobacillus actinomycetemcomitans, we demonstrate that the recombinant product of the CdtA gene binds to the surface of Chinese hamster ovary (CHO) cells. This protein did not induce distension or cytotoxicity when introduced into the cytosol using a lipid-based protein delivery system. Recombinant CdtB and CdtC proteins failed to bind to CHO cells. However, the delivery of either CdtB or CdtC into the cytosol resulted in the characteristic pattern of distension followed by cell death. Based on these results, it appears that the CdtA protein subunit alone is responsible for anchoring the holotoxin to the cell surface. The CdtC subunit, in concert with CdtB, contributes to the cytotoxic activities of the holotoxin. The specific mechanism of CdtC cytotoxicity is currently unknown