In this study, methods for data acquisition, analysis, modelling, and simulation of performance parameters in road cycling on real tracks were developed an evaluated. A simulator was designed to facilitate the measurement in a laboratory environment . The simulation included real height profiles and a video playback that was synchronised with the cyclist's current virtual position on the track and online visualisation of course and performance parameters. Field data obtained on mountain tracks in this study were compared with the state-of-the art mathematical model for road cycling power, established by Martin et al. in 1998, which accounts for the gradient force, air resistance, rolling resistance, frictional losses in wheel bearings, and inertia. The model described the performance parameters accurately with correlation coefficients of 0.96-0.99 and signal-to-noise ratios of 19.7-23.9 dB. It was shown that the mathematical model can be implemented on an ergometer for simulating rides on real courses providing similar quality measures when comparing field and simulator measurements.

The effect of observer metamerism induced by electronic displays depends to a large extent on their primary spectra (red, green, and blue in the most common case). In particular, for narrow‐band primary spectra whose peak wavelength lies in the range of high variability of the observer's color‐matching function, some observers can experience very large differences between actual surface colors (e.g. in a light booth) and displayed colors if the monitor is optimized for the International Commission on Illumination (CIE) 1931 standard observer. However, because narrow‐band light‐emitting diodes lead to larger color gamuts, more and more monitors with very narrow band primaries are coming onto the market without manufacturers taking into account the associated problem of observer variations. Being able to measure these variations accurately and efficiently is therefore an important objective. In this paper, we propose a new approach to predict the extent of observer metamerism for a particular multiprimary display. Unlike existing dedicated models, ours does not depend on a reference illuminant and a set of reflectance spectra and is computationally more efficient.

Abstract:In the Internet age, e-commerce provides customers global reach to a wide variety of products and plays a dominant role in business activity and competition. Competition is especially aggressive in the online travel domain where wholesalers, e.g. brokerage companies, contract through their contract managers with thousands of hotel brands and trade hotel products (usually hotel nights) for travel businesses or end customers.In order to conclude a profitable contract, a contract manager should be able to compare all the particulars of the prospective partner hotel with those of the competing hotels in the target city. Given that the number of contract managers is comparatively small compared to the large number of hotels, the possible knowledge base is limited. Thus, the hotel brokerage companies are only able to bargain with a relatively limited number of hotels, and the contract profitability relies heavily on the contract managers' expertise and communication skills. In this paper we present a price management decision support system (DSS) for hotel brokers that allows analysis of hotel prices using spatial and non-spatial characteristics, estimation of the objective relative hotel prices, and determination of the profitability of the existing or future contracts. We built our system using free and open source tools including geographic information system and data mining frameworks that allow companies with limited money resources or manpower to implement such a prototype. We show the effectiveness of our tool by covering all the major components of the DSS such as data selection and integration, model management and user interface. We demonstrate our tool on the area of Barcelona, Spain using a real data of 168 hotels provided by one of the travel service providers.