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Outputs (444)

Approximating the number of acyclic orientations for a class of sparse graphs (2004)
Journal Article
Bordewich, M. (2004). Approximating the number of acyclic orientations for a class of sparse graphs. Combinatorics, Probability and Computing, 13(1), 1-16. https://doi.org/10.1017/s0963548303005844

The Tutte polynomial $T(G;x,y)$ of a graph evaluates to many interesting combinatorial quantities at various points in the $(x,y)$ plane, including the number of spanning trees, number of forests, number of acyclic orientations, the reliability polyn... Read More about Approximating the number of acyclic orientations for a class of sparse graphs.

On the space of oriented affine lines in R^3 (2004)
Journal Article
Guilfoyle, B., & Klingenberg, W. (2004). On the space of oriented affine lines in R^3. Archiv der Mathematik, 82(1), 81 - 84. https://doi.org/10.1007/s00013-003-4861-3

We introduce a local coordinate description for the correspondence between the space of oriented affine lines in Euclidean and the tangent bundle to the 2-sphere. These can be utilised to give canonical coordinates on surfaces in, as we illustrate wi... Read More about On the space of oriented affine lines in R^3.

Characterisation of Bluetooth Carrier Frequency Errors (2003)
Presentation / Conference Contribution
Robinson, C., & Purvis, A. (2003, June). Characterisation of Bluetooth Carrier Frequency Errors. Presented at Proceedings of the 9th IEEE International Mixed Signal Testing Workshop (IMSTW’03), Seville, Spain

Bluetooth, the short range wireless communications standard, operates in the unlicensed ISM frequency band at 2.4 GHz using Gaussian Frequency Shift Keying (GFSK) modulation. After a brief introduction to GFSK and FM demodulation, the paper describes... Read More about Characterisation of Bluetooth Carrier Frequency Errors.

The Development of a Digital Switched Mode Power Supply Controller and Controller Design Tool (2003)
Presentation / Conference Contribution
Maiden, A., Purvis, A., & Kinghorn, M. (2003, March). The Development of a Digital Switched Mode Power Supply Controller and Controller Design Tool. Presented at Proc International Signal Processing Conference, Dallas, Texas

This paper presents a software tool for the autonomous design of digital Switched-Mode Power Supply compensators based on step -response. The program uses a Genetic Algorithm (GA) to locate an optimal controller configuration within a search space. S... Read More about The Development of a Digital Switched Mode Power Supply Controller and Controller Design Tool.

Bi-dynamic indoor measurements with high resolution channel sounder (2002)
Presentation / Conference Contribution
Salous, S., & Hinostroza, V. (2002, December). Bi-dynamic indoor measurements with high resolution channel sounder

In this paper, we describe the architecture of a fully bi-dynamic 300 MHz channel sounder developed at UMIST for indoor channel characterisation. Results of measurements in different indoor environments are presented.

Urban and suburban frequency division duplex measurements for UMTS (2002)
Presentation / Conference Contribution
Salous, S. (2002, December). Urban and suburban frequency division duplex measurements for UMTS

Wideband measurements across the two frequency bands allocated for UNITS serivesc have been carried out in the dense urban environment of Manchester city centre and in the suburbas of Manchester. The data were anaylsed to characterise the differences... Read More about Urban and suburban frequency division duplex measurements for UMTS.

A VXIBus Based Bluetooth Radio Test Set For IC Validation and Debug (2002)
Presentation / Conference Contribution
Robinson, C., & Purvis, A. (2002, June). A VXIBus Based Bluetooth Radio Test Set For IC Validation and Debug. Presented at Proceedings of the 8th IEEE International Mixed Signal Testing Workshop (IMSTW’02), Montreux, Switzerland

Dual-frequency sounder for UMTS frequency-division duplex channels (2002)
Journal Article
Salous, S., & Gokalp, H. (2002). Dual-frequency sounder for UMTS frequency-division duplex channels. IEE proceedings. Communications, 149(2), 117-122. https://doi.org/10.1049/ip-com%3A20020248

A single-frequency wideband chirp sounder designed and implemented at UMIST was modified to carry out Simultaneous measurements at the uplink and downlink frequencies of the UMTS bands. Measurements in the dense urban environment of Manchester city c... Read More about Dual-frequency sounder for UMTS frequency-division duplex channels.

Mains Appliance Identification for Electrical Safety Test System. (2002)
Presentation / Conference Contribution
McWilliam, R., & Purvis, A. (2002, March). Mains Appliance Identification for Electrical Safety Test System. Presented at Proc. 6th International Symposium on Power-Line Communications and its Applications., Athens, Greece

A new algorithm for high-quality ionogram generation and analysis (2002)
Journal Article
Arikan, F., Arikan, O., & Salous, S. (2002). A new algorithm for high-quality ionogram generation and analysis. Radio Science, 37(1), https://doi.org/10.1029/2000rs002569

Standard digital ionograms that are generated by fast Fourier transform or autoregressive modeling suffer from high interference levels due to other users of the HF channel which produce artifacts and distortion, hence complicating automatic processi... Read More about A new algorithm for high-quality ionogram generation and analysis.

Characterisation of W-CDMA channels in FDD units bands - 2001 IEEE 54thVehicular Technology Conference - VTC Fall '01 (2001)
Presentation / Conference Contribution
Salous, S., & Gokalp, H. (2001, December). Characterisation of W-CDMA channels in FDD units bands - 2001 IEEE 54thVehicular Technology Conference - VTC Fall '01

Simultaneous wideband measurements across the two-60 MHz bands allocated for the frequency division duplex UNITS channels were carried out in the dense urban environment of Manchester city-centre. Measurements with a trolley or a van are used to dete... Read More about Characterisation of W-CDMA channels in FDD units bands - 2001 IEEE 54thVehicular Technology Conference - VTC Fall '01.

Bi-dynamic UHF channel sounder for indoor measurements (2001)
Presentation / Conference Contribution
Salous, S., & Hinostroza, V. (2001, December). Bi-dynamic UHF channel sounder for indoor measurements

This paper presents the architecture of a 300 MHz linearly frequency modulated sounder suitable for indoor measurements. The sounder, which uses a digital frequency technique, permits the sampling of the channel at high repetition rates and full bi-d... Read More about Bi-dynamic UHF channel sounder for indoor measurements.

Real hypersurfaces of Kahler manifolds (2001)
Journal Article
Klingenberg, W. (2001). Real hypersurfaces of Kahler manifolds. Asian Journal of Mathematics, 5(1), 1 -18. https://doi.org/10.4310/ajm.2001.v5.n1.a1

Building on work by S. M. Webster \ref[J. Differential Geom. 13 (1978), no. 1, 25--41; MR0520599 (80e:32015)] the author studies the geometry of the second fundamental form of a real hypersurface in a Kähler manifold. As an application he proves that... Read More about Real hypersurfaces of Kahler manifolds.