6,319 research outputs found

    Fiscal Update, August 30, 2006

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    The Fiscal Division newsletter, published weekly during session and periodically during the interim

    A simulation into the physical and network layers of optical communication network for the subsea video surveillance of illicit activity.

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    Criminal activity is increasingly entering the ocean subsurface with acts such as illegal fishing and narco-submarining becoming points of contention. This among other illicit acts taking place in this domain imply a need for surveillance to render these activities apparent. However, subsurface Underwater Sensor Networking which is central to the surveillance is still generations behind terrestrial networking, therefore it is still challenging to monitor for subsurface activities. This is since the current signal transmission standard, acoustic communication, is limited in practical bandwidth and thus channel data-rate, this is, however, caveated with omni-directional propagation and supreme range rendering it reliable but incapable of carrying video or other data intensive sensor information. There is, however, an emerging technology based on optical (visible light) communication that can accommodate surveillance applications with superior data rates and energy savings. This investigation demonstrates how theoretically it is possible to achieve a network of underwater channels capable of sustaining a multimedia feed for monitoring subsurface activity using modern optical communication when in compared to an acoustic network. In addition, a simple topology was investigated that shows how the range limitations of this signaling can be extended by adding floating relay nodes. Through simulations in Network Simulator 3 (NS-3)/Aquasim-NG software it is shown that Visible Light wireless communication in visible light networks have a channel capacity high enough to carry out monitoring in strategic areas, referencing, optical modems that are available in the market. This implies that data-rates of 10 Mb/s are possible for the real-time video surveillance

    The Cord (November 10, 2010)

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    Designing a constellation for AIS mission based on data acquisition of LAPAN-A2 and LAPAN-A3 satellites

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    Indonesia requires a maritime surveillance system that's capable to monitor its extensive waters territorial. One of the maritime standard navigation systems named AIS (Automatic Identification System), which is based on GPS and VHF digital communication, have enabled the ship monitoring in a real-time. By placing AIS receiver on the satellite, its coverage will be larger compared to the one usually placed on the seashore by maritime authority. Orbiting the AIS receiver prompted appearing the limitation of Time Division Multiple Access (TDMA) technology so the probability of ship detection would decrease drastically due to a huge number of heard ship signal simultaneously. This paper describes the design of satellite constellation for Indonesian maritime surveillance based on the result of the AIS data acquisition by LAPAN-A2 and LAPAN-A3 satellites that operate in both equatorial and polar orbit

    Broadband infrastructure in the 21st century : an evaluation of local outcomes and conditions.

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    Since 2001, the Federal government has invested approximately 10billiontoexpandbroadbandinfrastructurethroughoutthenation,includingvariousloanprogramsandgrantsauthorizedthroughFarmBillsand,morerecently,theAmericanRecoveryandReinvestmentActof2009(Kruger,2012).Theseinvestmentsdwarfcapitalinvestmentsmadebythetoptelecommunicationsandcablecompaniesestimatedat10 billion to expand broadband infrastructure throughout the nation, including various loan programs and grants authorized through Farm Bills and, more recently, the American Recovery and Reinvestment Act of 2009 (Kruger, 2012). These investments dwarf capital investments made by the top telecommunications and cable companies estimated at 50 billion per year (Federal Communications Commission [FCC], 2010, p. 18). While the rage on all levels has been connecting residents, few studies have attempted to measure investments in broadband infrastructure to demonstrate positive outcomes or improvements, especially from a wide variety of economic and social indicators. This project was implemented to explore the importance of broadband infrastructure to communities in the post-industrial, digitization era or the period defined by Daniel Bell (1998) as the “third technological revolution” (pp. 96-115). Using an economic utilitarian approach, the investigator investigated the relationships between broadband infrastructure and commonly accepted economic indicators. Both quantitative and qualitative methods were used for collecting and analyzing data relating to the broadband infrastructure, economic growth, and social characteristics of counties-the primary unit of measurement in this study. Specifically, the investigator analyzed relationships using ordinary least squares linear regression analysis at the aggregate level, and qualitative comparative analysis using a sample of counties. The results from this study suggest that some direct effects may exist between broadband and select economic growth indicators. However, broadband more likely provides an interaction effect on economic growth across all industry sectors through variables representing human capital (e.g., educational attainment, worker skills and training), household income and community earnings levels, and industry diversity. There is also a strong relationship between broadband infrastructure and urban influence, which is consistently significant at explaining growth indicators. However, the exact nature of the interaction between broadband and urban influence remains unknown. Based on both the quantitative and qualitative results, there is evidence that broadband infrastructure and being “wired” does come with benefits at the community level and support economic growth. This study provided empirical data to support these relationships at the local scale in the United States

    The George-Anne

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    GSU Talks Green: Conversations in Campus Sustainability Begin Friday News Opinion Features Classifieds Briefs Sport

    The George-Anne

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