Exact Controllability of Linear Stochastic Differential Equations and Related Problems

A notion of $L^p$-exact controllability is introduced for linear controlled (forward) stochastic differential equations, for which several sufficient conditions are established. Further, it is proved that the $L^p$-exact controllability, the validity of an observability inequality for the adjoint equation, the solvability of an optimization problem, and the solvability of an $L^p$-type norm optimal control problem are all equivalent

Research on the Application of Value Creation of Big Data in Smart Tourism

Against the background of the new era, the rapid progress of information science and technology represented by big data, cloud computing and Internet of things promotes the intelligent transformation of tourism industry. Based on the technical support of big data, it integrates tourism resources to generate value creation and apply it in smart tourism, and promotes the optimization and innovation of tourism at the level of marketing, service and management. In the context of informatization, the implementation of smart tourism has become the only way for the development of the tourism industry (Dai, P. ,2015). However, the application of big data in smart tourism also faces such problems as dense and miscellaneous information data, uneven level of information technology, lack of smart tourism big data professionals, and privacy data security (Yang, X.,2015). This paper discusses the development status and future direction of smart tourism in the context of big data, so as to boost the steady development of smart tourism relying on big data platform

Design of GPS Information Processing System Based on Single Chip Microcomputer

With the rapid development of science and technology in the 21st century, the Global Positioning System (GPS) has become one of the representatives of the development achievements of this era. The system not only has high precision and good performance, but also has a wide range of application. It has been widely used in land, ocean, space and other fields, with a very high market share. In response to a surge in demand for satellite-positioning and navigation applications, In this paper, the GPS information processing system is constructed with hardware modules such as GPS receiving module and LCD module as the main structure, single chip microcomputer as the core controller, supplemented by necessary peripheral circuits. The success of GPS information processing system based on single chip microcomputer solves the problem of high price of GPS devices in the market. In general, the design structure is not only modular and easy to carry, the most important is the human nature, cost-effective, and has great practical value

All-optical spatio-temporal metrology for isolated attosecond pulses

Characterizing an isolated attosecond pulse (IAP) is essential for its potential applications. A complete characterization of an IAP ultimately requires the determination of its electric field in both time and space domains. However, previous methods, like the widely-used RABBITT and attosecond streaking, only measure the temporal profile of the attosecond pulse. Here we demonstrate an all-optical method for the measurement of the space-time properties of an IAP. By introducing a non-collinear perturbing pulse to the driving field, the process of IAP generation is modified both spatially and temporally, manifesting as a spatial and a frequency modulation in the harmonic spectrum. By using a FROG-like retrieval method, the spatio-spectral phases of the harmonic spectrum are faithfully extracted from the induced spatio-spectral modulations, which allows a thoroughgoing characterization of the IAP in both time and space. With this method, the spatio-temporal structures of the IAP generated in a two-color driving field in both the near- and far-field are fully reconstructed, from which a weak spatio-temporal coupling in the IAP generation is revealed. Our approach overcomes the limitation in the temporal measurement in conventional in situ scheme, providing a reliable and holistic metrology for IAP characterization.Comment: 18 pages, 5 figure

MICROORGANISMS FROM HANDS OF TRADITIONAL CHINESE MEDICAL DOCTORS IN A CENTRAL HOSPITAL ENVIRONMENT

Background: In a central hospital, the heavy clinical workload makes one to overlook its hazard to health and can to a large extent promote the transmission of pathogenic microorganisms. It is not uncommon however, to observe practices that deviate from normal standards of hygiene. Hand contact between doctors of TCM and patients may lead to nosocomial infections. Materials and Methods: Samples were sourced and collected from hands of TCM doctors in a central hospital. The fungal isolates were identified by colonial morphology and microscopic examination. Sensitivity test were performed on each of the identified isolates using the Multiple Disc Diffusion method. Results: A total of 265 samples were collected from the fingers, palm and back of hands of TCM doctors. Seven organisms were isolated, with S. aureus being the most common bacterium with frequency of 55.9% in the hospital environment. Other bacteria isolated included P. aeruginosa, E. coli and K. aerogenes. S. cerevisae was the most common fungus isolated with frequency of 61.8%. Fungi isolated included P. chrysogenum and A. niger. Conclusion: The study showed clearly that hand contact between TCM doctors and patients may lead to infection of exposed susceptible patients. Results of antibiotic susceptibility pattern show that isolates in this study are mostly resistant to augmentin and most antibiotics of old generation, while gentamycin and pefloxacin were highly active against most of isolates. Considering the possibility of transmission of contamination, special attention should be directed towards disinfection of TCM doctors’ hands