A. Pearmain - Academia.edu (original) (raw)

Papers by A. Pearmain

Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1978, 1978

1980 IEEE International Conference on Electrical Insulation, 1980

New dielectric tapes were developed for a superconducting, flexible, ac power cable. Preliminary ... more New dielectric tapes were developed for a superconducting, flexible, ac power cable. Preliminary aging tests were performed. Tests show that the proposed system withstood frequency accelerated aging at a cable stress of 10 MV/m for an equivalent 60 Hz time period of te 531 days under the cryogenic conditions of the proposed cable. The partial discharge inception stress for a helium density of 110 kg/mÂ³ declined from 12.3 MV/m at the beginning of aging to 7.1 MV/m at the end. This was thought to be due to the erosion of the vapor-deposited aluminum layer on the screen tapes. Although the dielectric tapes were exposed to partial discharge activity for almost the whole period of the test, there was no significant deterioration of the tapes. This suggests that damage due to discharges must be less at cryogenic temperatures.

The use of a Distributed Array Processor (DAP), either in its own right or as a technique for sim... more The use of a Distributed Array Processor (DAP), either in its own right or as a technique for simulating systolic array hardware structures, is discussed. In particular, the Geram-Schmidt open loop structure for orthogonalization and McWhirter's modified systolic array structure for Givens rotation are mapped onto the DAP with modifications to make use of the fast parallel data transfer capability

Proceedings IEEE International Conference on Multimedia Computing and Systems, 1999

The television industry is currently undergoing changes with historic proportions, posing tremend... more The television industry is currently undergoing changes with historic proportions, posing tremendous challenges and opportunities. This is fuelled by the proliferation of new delivery channels to consumers, new capabilities of these channels to carry a multitude of data in addition to conventional video/audio programmes and the need to fill these channels with content. CustomTV is addressing the crucial problem of

International Journal of Electrical Engineering Education, 1989

The ELLA hardware description language and simulator are used at Queen Mary College in a final-ye... more The ELLA hardware description language and simulator are used at Queen Mary College in a final-year course where students simulate the specification of a design to verify the correctness of the specification and the definitions of the design partitions. Research use is in evaluating alternative parallel architectures for signal processing.

Visual Communications and Image Processing 2005, 2005

In this paper the flexible macroblock ordering (FMO or arbitrary slice ordering) feature of the H... more In this paper the flexible macroblock ordering (FMO or arbitrary slice ordering) feature of the H.264/AVC codec has been used to improve the robustness of the transmitted video through unreliable channels. FMO improves the decoded video quality remarkably in the presence of an appropriate error concealment algorithm. There are a number of mapping structures to distribute the macroblocks in individual slice groups. In this paper, we propose a new mapping scheme that provides an opportunity for transmission layers to protect the macroblocks that are more important. This will introduce a new unequal error protection (UEP) scheme based on FMO. Our simulation results show that this UEP scheme is efficient and successful, especially at high bit error rates.

Proceedings of First International Workshop on Wireless Image/Video Communications, 1996

ABSTRACT

Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics, 1989

The correlation between the discharge parameters and the corresponding material damage was invest... more The correlation between the discharge parameters and the corresponding material damage was investigated for small insulating systems (arranged in butt gap formations) of UOPE- (uniaxially oriented polyethylene-) tape/oil systems under both electrical and thermal stresses. These systems were investigated with the aid of a point/plane electrode arrangement. The tests showed that there is a strong correlation between the total surface

Proceedings EC-VIP-MC 2003. 4th EURASIP Conference focused on Video/Image Processing and Multimedia Communications (IEEE Cat. No.03EX667), 2003

Abstract Embedding watermark in compressed video is a challenging problem, and moreover transcodi... more Abstract Embedding watermark in compressed video is a challenging problem, and moreover transcoding the watermarked video due to bandwidth requirement makes the watermark more difficult to survive. As we know, transcoding sometimes involves ...

IEEE Transactions on Electrical Insulation, 1984

2005 5th International Conference on Information Communications & Signal Processing, 2005

The flexible macroblock ordering (FMO) feature of the state-of-the-art advanced video coding stan... more The flexible macroblock ordering (FMO) feature of the state-of-the-art advanced video coding standard, H.264, provides an efficient error resilience tool for video transmission over unreliable channels. In this paper, we exploit FMO to classify the data and introduce an opportunity for unequal error protection (UEP), where more important macroblocks are better protected than the others. However, the default mapping structures

2006 IEEE International Conference on Multimedia and Expo, 2006

Proceedings of the 19th Electrical Electronics Insulation Conference, 1989

The occurrence of partial discharges in an insulating system consisting of lapped uniaxially orie... more The occurrence of partial discharges in an insulating system consisting of lapped uniaxially oriented polyethylene tapes impregnated with dodecylbenzene oil and their effect were studied with uniform and nonuniform field electrode arrangements. The effect of various temperatures on the breakdown stress of the insulating system was investigated for the first arrangement. A correlation between discharge energy and material damage was established for the nonuniform field arrangement. The discharge energy delivered to the test object seems to be a much more useful discharge parameter than the largest partial discharge magnitude. The influence of temperature on the breakdown stress was also studied. The present insulation system performed satisfactorily up to 70°C. It started deteriorating, however, at 90°C

Electrical Engineer's Reference Book, 1993