Search results for "technical"
showing 10 items of 955 documents
Safety assurance of an industrial robotic control system using hardware/software co-verification
2022
As a general trend in industrial robotics, an increasing number of safety functions are being developed or re-engineered to be handled in software rather than by physical hardware such as safety relays or interlock circuits. This trend reinforces the importance of supplementing traditional, input-based testing and quality procedures which are widely used in industry today, with formal verification and model-checking methods. To this end, this paper focuses on a representative safety-critical system in an ABB industrial paint robot, namely the High-Voltage electrostatic Control system (HVC). The practical convergence of the high-voltage produced by the HVC, essential for safe operation, is f…
A comparative analysis of the statistical properties of large mobile phone calling networks.
2014
Mobile phone calling is one of the most widely used communication methods in modern society. The records of calls among mobile phone users provide us a valuable proxy for the understanding of human communication patterns embedded in social networks. Mobile phone users call each other forming a directed calling network. If only reciprocal calls are considered, we obtain an undirected mutual calling network. The preferential communication behavior between two connected users can be statistically tested and it results in two Bonferroni networks with statistically validated edges. We perform a comparative analysis of the statistical properties of these four networks, which are constructed from …
Effect of FRP strengthening on the flexural behaviour of calcarenite masonry walls
2017
The use of fiber-reinforced polymers (FRP) for structural strengthening has become increasingly popular in recent years. Several applications of FRP have been proposed and applied, depending on the target of the technique, kind and/or material of the structural member. In particular, because of their great tensile strength, FRP materials are commonly used to enhance the out-of-plane behaviour of masonry walls, allowing to increase their strength, ductility and improving safety against overturning. For these reasons, FRP laminates are often applied in vulnerable ancient buildings in seismic areas to reinforce façades and walls with poor structural features. However, some issues arise when a…
Identifying wave and turbulence components in wind-driven shallow basins
2012
Wind-induced waves play an important role in shallow lake hydro- and sediment dynamics. That is why field measurements are important for the validation of their estimation methods, especially in shallow waters. In the first part of the present paper a method is introduced to improve the interpretation of the measured data, applicable both for pressure and velocity data. Replacing the turbulence-affected tail of the measured spectrum with a fitted power function causes a considerable 8-10% difference in the derived bulk wave parameters so this procedure is worth to be done. In the second part an appropriate technique to obtain wave features from 3D velocity time series will be described. The…
Seismically induced, non-stationary hydrodynamic pressure in a dam-reservoir system
2003
Stochastic seismic analysis of hydrodynamic pressure in a dam-reservoir system is presented in this paper. The analysis is conducted assuming infinite reservoir compressible fluid and modeling seismic acceleration as a normal zero-mean stochastic process obtained by Penzien filter. The non-homogeneous boundary conditions associated to the problem have been incorporated into the equation of pressure wave scattering in the form of a forcing function turning the non-homogeneous boundary value problem into an homogeneous one. Solution obtained via modal analysis in time-domain is coupled with the use of classical Ito stochastic differential calculus to characterize the stochastic hydrodynamic p…
DEVELOPMENT OF LATVIAN AUTO ROADS AND ADMINISTRATIVE SYSTEM IMPROVEMENT
2012
Auto road sector in national economy, is a sector development of which, with appropriate funding, creates basis for other sector development and facilitates competitiveness of country in international market. The goal of auto road sector is auto road network maintenance and development, in order to contribute to the development of the whole country, increase of standards of living of inhabitants, as well as facilitate compliance of Latvian auto roads with the European Union requirements for auto road network. Effective resource utilization and investment attraction to auto road sector is determinant for favorable conditions to overcome economic crisis, structural changes in national econom…
The History of European Infrastructure Finance: An Analytical Framework
2016
How can socio-economic resources be mobilized to pay for works that offer benefits only in the future, often in the distant future? We discuss what we understand by infrastructure, a term that can have different meanings/semantic contents, and whose definition issues reveal some recurrent conceptual problems. Finance is here understood in the very broad sense of a set of mechanisms bringing to investment, and future benefits, the resources needed in advance to pay for it. We offer a brief discussion of technological and organizational change, as several of our examples and other literature that we cite show that investment and finance decisions are deeply interwoven with knowledge, manageme…
A Comprehensive Look at the Real-Life Performance of Moving Average Trading Strategies
2015
Despite the enormous current interest in market timing and a series of publications in academic journals, there is still lack of comprehensive research on the evaluation of the profitability of trading rules using methods that are free from the data-snooping bias. In this paper we utilize the longest historical dataset that spans 155 years and extend previous studies on the performance of moving average trading rules in a number of important ways. Among other things, we investigate whether overweighting the recent prices improves the performance of timing rules; whether there is a single optimal lookback period in each trading rule; and how accurately the trading rules identify the bullish …
Destructuration of typical Sicilian calcarenites
2010
The paper discusses some interesting features of Sicilian fine grain calcarenites. Uniaxial, triaxial, oedometer and isotropic compression tests were undertaken on intact specimens of two types of calcarenite in order to investigate their mechanical characteristics. It was found that the strength and deformability is significantly influenced by the structure (fabric and bonding) and by the destructuration processes. A better understanding of fracture development behavior is gained through a combination of acoustic emission and photographic monitoring on non-homogeneous samples with natural pre-existing heterogeneities due to cementation or to density. The results show that the destructurati…
Place des ERP dans le suivi de la performance des filiales par la maison-mère
2016
This study seeks to shed the light on the role of Enterprise Resource Planning (ERP) as a management tool adopted by multinational corporations in their monitoring of the headquarters/ subsidiary performance. We have opted for a deductive approach, focusing on multinational corporations whose subsidiaries are based in Morocco and which are endowed with the ERP tool. To meet this end, we have carried out both a qualitative and a quantitative study. Qualitatively, the six semi directive interviews conducted with the subsidiaries management fit in harmoniously with the items that figure in our questionnaire, submitted to 104 subsidiaries in the framework of a quantitative study. We have found …