No abstract

The important role that taxis play in bringing passengers from an airport terminal to their final destination is often overlooked in airport operations and design. Due to varying flight arrival patterns at different terminals, taxi drivers are often unsure which terminal they should queue at. In this thesis, we present ChangiNOW, a mobile app that uses a predictive queueing model to efficiently allocate taxis. The ChangiNOW system uses observed taxi and flight data at each of the four terminals of Singapores Changi Airport to estimate the expected waiting time and queue length for taxis arriving at these terminals, and then sends taxis to terminals where waiting time is shortest. The app communicates this information to taxi drivers in a visually intuitive and appealing way, motivating them to service those terminals with the highest taxi demand. We present the theoretical details that underpin our prediction engine and validate our theory with several targeted numerical simulations. Finally, we evaluate the performance of this system in large-scale experiments and show that our system achieves a significant improvement in both passenger and taxi waiting time.

This paper presents the research results on the development and implementation of a traceable and efficient system which is characterized by a high accuracy level, transposed within a specialized IT application in order to properly implement certain sampling schemes required for assessing the conformity of civil use explosives and pyrotechnic articles, in compliance with the

In order to have a proper image of the seismic effect generated by blasting works performed in quarries, the assessment methods applied before starting the blasting activity using explosives for civil use have to take into account as many information as possible with regard to blasting conditions, type of explosive, blasting technique, characteristics of the environment in which the explosive is detonated and in which the seismic waves are generated. Given the complex mode of propagation of seismic waves in the vicinity of quarries, the assessment process may show differences between anticipated values and those measured when performing blasting in quarries. The differences ascertained highlights the importance of seismic measurements in situ, the appropriate way to establish the safety level in carrying blasting in quarries with regard to the seismic effect. This paper presents the results obtained by applying the empirical formulas for estimating the seismic effect and the evaluation of the seismic effect by applying methods and criteria based on the results recorded to the seismic measurements made in quarries. The results obtained according to the requirements of the general standards or other technical regulations, make possible to observe the level of risk regarding the seismic effect for the purpose of applying technical measures to reduce it if the situation requires.

The paper presents the results of the theoretical and practical research on the development of the technical and methodological infrastructure for assessing the safety parameter regarding the sensitivity to impact of explosives for civil use in order to increase the degree of security in their handling and use. The currently used method for determining the sensitivity to impact is based on the provisions of harmonized European Standard SR EN 13631-4. Expression of the results implies a particular experience of the research team, the conclusion of the test being in the form of a qualitative response reaction/non reaction to different energies (J) applied to the explosive samples, based on observed effects such as: smoke, explosion noise, flame / spark with or without combustion traces on the subassembly of the specialized test equipment. In order to carry out in good conditions the installation, use and maintenance of the specialized equipment for assessing the susceptibility of the tested substances to impact stimuli, the working procedure of the Department of Explosives and Pyrotechnic Products was elaborated and implemented, PL-04 working procedure with the designation “Working procedure for the installation, use and maintenance of BFH-12A type equipment designed to assess the sensitivity of test substances to impact stimuli”.