Pamphlets on English architecture assembled by George Gilbert Scott.

Vol. 6, unanalyzed publications, cont. Records of Buckinghamshire, by the Architectural and Archaeological Society for the County of Buckingham (1854). Includes articles: Ancient British gold coins found in Whaddon Chase. Antiquities of the Chiltern Hills / W.J. Burgess. Aylesbury Church in 1848 : architect's report / Geo. Gilbert Scott. A letter from G.G. Scott, Esq., on the supposed Saxon work at Iver and at Wing. Church bells / Robert Eaton Batty. The desecrated churches of Buckinghamshire [cont.]. Drayton Beauchamp / by W. Hastings Kelke. St. Mary's, Ashendon, Bucks. / by Frederick George Lee. Earth-works at Hampden and Little Kimble / by Boughey Burgess. Hilldesden Church -- Transactions of the St. Albans Architectural and Archaeological Society (1851). Includes article: Notice of a seal formed of bone, discovered in the Abbey Church, St. Albans ... / by Albert Way.

SDN enabled dynamically reconfigurable high capacity optical access architecture for converged services

Dynamically reconfigurable time-division multiplexing (TDM) dense wavelength division multiplexing (DWDM) long-reach passive optical networks (PONs) can support the reduction of nodes and network interfaces by enabling a fully meshed flat optical core. In this paper we demonstrate the flexibility of the TDM-DWDM PON architecture, which can enable the convergence of multiple service types on a single physical layer. Heterogeneous services and modulation formats, i.e. residential 10G PON channels, business 100G dedicated channel and wireless fronthaul, are demonstrated co-existing on the same long reach TDM-DWDM PON system, with up to 100km reach, 512 users and emulated system load of 40 channels, employing amplifier nodes with either erbium doped fiber amplifiers (EDFAs) or semiconductor optical amplifiers (SOAs). For the first time end-to-end software defined networking (SDN) management of the access and core network elements is also implemented and integrated with the PON physical layer in order to demonstrate two service use cases: a fast protection mechanism with end-to-end service restoration in the case of a primary link failure; and dynamic wavelength allocation (DWA) in response to an increased traffic demand.

Communication Architecture Design for Real-Time Networked Control Systems

Networked control over data networks has received increasing attention in recent years. Among many problems in networked control systems (NCSs) is the need to reduce control latency and jitter and to deal with packet dropouts. This paper introduces our recent progress on a queuing communication architecture for real-time NCS applications, and simple strategies for dealing with packet dropouts. Case studies for a middle-scale process or multiple small-scale processes are presented for TCP/IP based real-time NCSs. Variations of network architecture design are modelled, simulated, and analysed for evaluation of control latency and jitter performance. It is shown that a simple bandwidth upgrade or adding hierarchy does not necessarily bring benefits for performance improvement of control latency and jitter. A co-design of network and control is necessary to maximise the real-time control performance of NCSs

SKMA - A Key Management Architecture for SCADA Systems

Supervisory Control And Data Acquisition (SCADA) systems are widely used in the management of critical infrastructure such as electricity and water distrubution systems. Currently there is little understanding of how to best protect SCADA systems from malicious attacks. We review the constraints and requirements for SCADA security and propose a suitable architecture (SKMA) for secure SCADA communications. The architecture includes a proposed key management protocol (SKMP). We compare the architecture with a previous proposal from Sandia Labs.