150,144 research outputs found

    Mining Target-Oriented Fuzzy Correlation Rules to Optimize Telecom Service Management

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    To optimize telecom service management, it is necessary that information about telecom services is highly related to the most popular telecom service. To this end, we propose an algorithm for mining target-oriented fuzzy correlation rules. In this paper, we show that by using the fuzzy statistics analysis and the data mining technology, the target-oriented fuzzy correlation rules can be obtained from a given database. We conduct an experiment by using a sample database from a telecom service provider in Taiwan. Our work can be used to assist the telecom service provider in providing the appropriate services to the customers for better customer relationship management.Comment: 10 pages, 7 table

    "Telecommunication Services and Economic Growth: Evidence from India"

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    This paper estimates the contribution of telecommunication (or telecom) services to aggregate economic growth in India. Estimated contribution is distinguished between public and private sectors to highlight the impact of telecom privatization on economic growth. Knowledge of policy determinants of demand of telecom services is shown to be essential to enhance growth contribution of telecom services. Using a recent sample survey data from Karnataka State in South India, price and income determinants of demand for telecom services are estimated by capacity of telephone exchanges Estimation results offer evidence for significant negative own price elasticity and positive income elasticity of demand for telecom services. In addition, survey data are used to show for non-economic factors that influence demand for telecom services including non-awareness of the usage and cost of value added services. These results have implications for design of a national policy for promotion of demand for telecom services and economic growth.

    Quantum entanglement distribution with 810 nm photons through telecom fibers

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    We demonstrate the distribution of polarization entangled photons of wavelength 810 nm through standard telecom fibers. This technique allows quantum communication protocols to be performed over established fiber infrastructure, and makes use of the smaller and better performing setups available around 800 nm, as compared to those which use telecom wavelengths around 1550 nm. We examine the excitation and subsequent quenching of higher-order spatial modes in telecom fibers up to 6 km in length, and perform a distribution of high quality entanglement (visibility 95.6%). Finally, we demonstrate quantum key distribution using entangled 810 nm photons over a 4.4 km long installed telecom fiber link.Comment: 5 pages, 5 figures, 1 tabl

    Spectral noise in quantum frequency down-conversion from the visible to the telecommunication C-band

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    We report a detailed study of the noise properties of a visible-to-telecom photon frequency converter based on difference frequency generation (DFG). The device converts 580 nm photons to 1541 nm using a strong pump laser at 930 nm, in a periodically poled lithium niobate ridge waveguide. The converter reaches a maximum device efficiency of 46 % (internal efficiency of 67 %) at a pump power of 250 mW. The noise produced by the pump laser is investigated in detail by recording the noise spectra both in the telecom and visible regimes, and measuring the power dependence of the noise rates. The noise spectrum in the telecom is very broadband, as expected from previous work on similar DFG converters. However, we also observe several narrow dips in the telecom spectrum, with corresponding peaks appearing in the 580 nm noise spectrum. These features are explained by sum frequency generation of the telecom noise at wavelengths given by the phase matching condition of different spatial modes in the waveguide. The proposed noise model is in good agreement with all the measured data, including the power-dependence of the noise rates, both in the visible and telecom regime. These results are applicable to the class of DFG converters where the pump laser wavelength is in between the input and target wavelength.Comment: 10 page

    Telecom traffic and investment in developing countries : the effects of international settlement rate reductions

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    Developing countries, which received about $35 billion in net settlement payments from the United States telecom carriers between 1985 and 1998, were upset by the Federal Communications Commission's (FCC) decision to slash rates, because lower rates mean lower payments. They claim that the payments help finance telecom investment, and that the FCC's decision will therefore harm their telecom sectors. The author uses a panel data set for 178 countries from 1985 to 1998 to testhow changes in settlement rates affect telecom traffic and investment. He finds that rates are significantly negatively correlated with traffic, with the greatest effects in the poorest countries. In other words, reduced settlement rates spur telecom traffic from developing countries to the United States. And while there is a statistically significant correlation between settlement payments and telecom revenues in developing countries, he finds no correlation between the payments and the number of telephone mainlines or imports of telecommunications equipment. In short, there is no evidence that the payments are invested in telecom networks.Telecommunications Infrastructure,Housing&Human Habitats,Labor Policies,Payment Systems&Infrastructure,Economic Theory&Research,Airports and Air Services,Economic Theory&Research,Telecommunications Infrastructure,Payment Systems&Infrastructure,Housing&Human Habitats