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The Licklider transmission protocol (LTP) is a delay-tolerant point-to-point protocol being developed by the Delay-Tolerant Networking Research Group (DTNRG). LTP-Transport is an extension to LTP that provides end-to-end services and which is designed to be a generic Delay-Tolerant Network (DTN) friendly transport protocol. We describe our network emulation based test setup for these protocols and...
Challenging networks require transmission protocols able to deal with the specificities of the environment. These adverse conditions include very long delays (delays in hours are normal), episodic connectivity, asymmetric data rates, higher bit error rate (The raw BERs are in the order of 10-2), very high free space losses (around 250-300 dB) and power constraints that may severely compromise the...
As the technology underlying sensor networks becomes more advanced and reliable, ubiquitous computing will come closer to being a reality. This paper details the design and deployment of several sensor nodes that use the delay tolerant network approach in order to meet the relevant application requirements. Two applications are presented, lake water quality monitoring in rural lakes and noise level...
An array of double-heterostructure photonic crystal QW membrane lasers was fabricated in which number of cladding periods was varied. 60 muW peak output power was collected from the facet of one device by a bare fiber.
All optical switching has been demonstrated using photonic crystal directional couplers illuminated with a 10 mW control signal. Power splitters and wavelength filters are also demonstrated with these 10times12 mum footprint devices.
This paper reviews the Internet-inspired security work on delay tolerant networking, in particular, as it might apply to space missions, and identifies some challenges arising, for both the Internet security community and for space missions. These challenges include the development of key management schemes suited for space missions as well as a characterization of the actual security requirements...
Lasing near 1300 nm in microdisks with InAs quantum dot active regions is reported for the first time. The microdisks were optically pumped at room temperature, and lasing occurred in devices that are 2.5 /spl mu/m in diameter and larger.
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