A 24-GHz SiGe Phased-Array Receiver—LO Phase-Shifting Approach

A local-oscillator phase-shifting approach is introduced to implement a fully integrated 24-GHz phased-array receiver using an SiGe technology. Sixteen phases of the local oscillator are generated in one oscillator core, resulting in a raw beam-forming accuracy of 4 bits. These phases are distributed to all eight receiving paths of the array by a symmetric network. The appropriate phase for each path is selected using high-frequency analog multiplexers. The raw beam-steering resolution of the array is better than 10 [degrees] for a forward-looking angle, while the array spatial selectivity, without any amplitude correction, is better than 20 dB. The overall gain of the array is 61 dB, while the array improves the input signal-to-noise ratio by 9 dB

Game on! a report on the interactive leisure software subsector in London

There is a paucity of good quality data on the UK video games industry. Information such as value-added, investment on R&D, average annual expenditure on training and the value of video games in terms of exports, for example, is thin or incomplete. This is a serious problem. If we are to improve the competitiveness of the UK games development sector then we must have better quality information. Games developers will then be able to benchmark their business activities against industry averages. Overseas investors will also then be better informed about the benefits of investing in the UK leisure software sector. This Report confirms the lacunae in our knowledge that exists about the video games industry. For example, the Office of National Statistics still does not have a specific code to identify interactive leisure software businesses. Yet the Report also shines a light on the video games industry in the UK in general and in London in particular

Learning through online discussion: a case of triangulation in research

This paper reports on issues in carrying out research into online discussion. The context is a study of a distance learning module within an MBA program. The module required students to tackle problems based on real life scenarios within small online groups. Students were studying part time and shared similar professional backgrounds. The research looked at students' overall evaluation of the module, ways in which group work was conducted, and the contribution of the tutor. The approach taken was an interpretive case study using questionnaire survey, text analysis and interviews. The main findings from the study are reported, but the focus is on the strengths of, and difficulties in, using the research methods. Triangulation of methods provides the researcher with a greater degree of confidence in reporting findings, although subjective interpretation is still needed

Shifting Tides: China and North Korea

"The nuclear test was no less than a slap in China's face." Zhu Feng is a professor of the School of International Studies and director of the International Security Program in Peking University

Clinical audit: a synopsis

This synopsis is a brief report of the proceedings of the Clinical Audit Seminar organized by the Continuing Professional Development (CPD) Committee, held on the 29th October 2002. The seminar attracted a broad inter-professional audience, mainly consisting of doctors but also including pharmacists, nurses, and health service managers. In an effort to provide a broader focus, an effort has been made to introduce various perspectives on the topic, including one external to medicine. The idea was to try to learn concepts from other professions which could then be used to improve patient care; this practice has taken place in many industries, and is finally beginning to develop in medicine in different spheres.peer-reviewe

Exploring the environment, discovering learning resources and creating low cost training and development

School of Managemen

A multiphase seismic investigation of the shallow subduction zone, southern North Island, New Zealand

The shallow structure of the Hikurangi margin, in particular the interface between the Australian Plate and the subducting Pacific Plate, is investigated using the traveltimes of direct and converted seismic phases from local earthquakes. Mode conversions take place as upgoing energy from earthquakes in the subducted slab crosses the plate interface. These PS and SP converted arrivals are observed as intermediate phases between the direct P and S waves. They place an additional constraint on the depth of the interface and enable the topography of the subducted plate to be mapped across the region. 301 suitable earthquakes were recorded by the Leeds (Tararua) broad-band seismic array, a temporary line of three-component short-period stations, and the permanent stations of the New Zealand national network. This provided coverage across the land area of southern North Island, New Zealand, at a total of 17 stations. Rays are traced through a structure parametrized using layered B-splines and the traveltime residuals inverted, simultaneously, for hypocentre relocation, interface depth and seismic velocity. The results are consistent with sediment in the northeast of the study region and gentle topography on the subducting plate. This study and recent tectonic reconstructions of the southwest Pacific suggest that the subducting plate consists of captured, oceanic crust. The anomalous nature of this crust partly accounts for the unusual features of the Hikurangi margin, e.g. the shallow trench, in comparison with the subducting margin further north