Computer aided frequency planning for the radio and tv broadcasts

Cataloged from PDF version of article.The frequency planning of the VHF and UHF broadcasts in Turkey is described. This planning is done with the aid of computer databases and digital terrain map. The frequency offset is applied whenever applicable to increase the channel capacity. The offset assignment is done through Simulated Annealing algorithm. The international rules and regulations concerning Turkey are also considered

An examination of the effect of polarization on the radiation losses of bent optical fibres

It has long been recognized that the bending losses in weakly guiding optical fibres are independent of the polarization for large bend radius. Here, we show this fact using the volume equivalent current method. The procedure is then applied to a helically bent fibre and it is shown that the radiation from the helical fibre is also independent of the polarization as long as the fibre is weakly guiding. © 1993 Chapman & Hall

Urban information model for city planning

City planning is a complex task and therefore needs to consider the interplay between multi-aspects of a city, for example, transport, pollution, and crime. A city model is important to representing urban issues in a clear manner to the relative stakeholders. Although some city models have been used in the planning process, they are often based on narrow data sets. When sustainability and the quality of urban life generally is considered a more holistic analysis of city issues during the planning process is needed. It calls for city models to be based on integrated data sets. The paper describes the concept and challenges of nD urban information model. The research work on how to develop an nD urban information model to accommodate data sets relevant to different aspects of city planning is presented