Realtime Multilevel Crowd Tracking using Reciprocal Velocity Obstacles

We present a novel, realtime algorithm to compute the trajectory of each pedestrian in moderately dense crowd scenes. Our formulation is based on an adaptive particle filtering scheme that uses a multi-agent motion model based on velocity-obstacles, and takes into account local interactions as well as physical and personal constraints of each pedestrian. Our method dynamically changes the number of particles allocated to each pedestrian based on different confidence metrics. Additionally, we use a new high-definition crowd video dataset, which is used to evaluate the performance of different pedestrian tracking algorithms. This dataset consists of videos of indoor and outdoor scenes, recorded at different locations with 30-80 pedestrians. We highlight the performance benefits of our algorithm over prior techniques using this dataset. In practice, our algorithm can compute trajectories of tens of pedestrians on a multi-core desktop CPU at interactive rates (27-30 frames per second). To the best of our knowledge, our approach is 4-5 times faster than prior methods, which provide similar accuracy

How do we acquire understanding of conceptual models?

In organizations, conceptual models are used for understanding the domain concepts. Such models are crucial in analysis and development of information systems. An important factor of using the conceptual models is how quickly analysts are able to learn the domain concepts as depicted in the models. Using a laboratory experiment, this research used eye tracking technique to capture the speed of acquisition of understanding conceptual models. Two sets of conceptual models were used in this study- one theory based (REA pattern) and the other non-theory based (non REA pattern). It was found that the rate of learning of the domain concepts was faster with theory based models than with non-theory based models. However, users of the non-theory based model were able to catch up with the learning of the model concepts after being repeatedly exposed to the model

Noise Effect of Building Installation

Environmental state of domiciliation influenced basically by the noise load, which nowadays is the most important quality criterion. The paper shows investigation of authors and conclusions about actual questions of building installation equipment noise. | Calitatea mediului înconjurător al locuinţelor este esenţial influenţată de nivelul de zgomot, care, în zilele noastre este un criteriu calitativ important. Lucrarea prezintă cercetările şi concluziile autorilor privind problemele actuale de zgomot ale echipamentelor instalaţiilor interrioare din clădiri

Dynamical quantum phase transitions in Weyl semimetals

The quench dynamics in type-I inversion symmetric Weyl semimetals (WSM) are explored in this work which, due to the form of the Hamiltonian, may be readily extended to two-dimensional Chern insulators. We analyze the role of equilibrium topological properties characterized by the Chern number of the pre-quench ground state in dictating the non-equilibrium dynamics of the system, specifically, the emergence of dynamical quantum phase transitions (DQPT). By investigating the ground state fidelity, it is found that a change in the signed Chern number constitutes a sufficient but not necessary condition for the occurrence of DQPTs. Depending on the ratio of the transverse and longitudinal hopping parameters, DQPTs may also be observed for quenches lying entirely within the initial Chern phase. Additionally, we analyze the zeros of the boundary partition function discovering that while the zeros generally form two-dimensional structures resulting in one-dimensional critical times, infinitesimal quenches may lead to one-dimensional zeros with zero-dimensional critical times provided the quench distance scales appropriately with the system size. This is strikingly manifested in the nature of non-analyticies of the dynamical free energy, revealing a logarithmic singularity. In addition, following recent experimental advances in observing the dynamical Fisher zeros of the Loschmidt overlap amplitude through azimuthal Bloch phase vortices by Bloch-state tomography, we rigorously investigate the same in WSMs. Finally, we establish the relationship between the dimension of the critical times and the presence of dynamical vortices, demonstrating that only one-dimensional critical times arising from two-dimensional manifolds of zeros of the boundary partition function lead to dynamical vortices.Comment: 15 pages, 9 figure

Financial crisis: The incrediable hulk in Indian economic growth and external sector

This paper empirically examines the impact of current world-wide recession on India’s growth. The data for this study were compiled from RBI and Central Statistical Organisation (CSO). The paper has applied regression technique with GDP as dependent variable, while exports, imports, FDI and FII were taken as independent variables. Prior to regression analysis, all the variables are tested for stationarity, applying Augmented Dickey-Fuller (ADF) test. The data sets were also tested for seasonality by applying auxiliary regression. Because of the problem of multicolinearity among the independent variables, three models, dropping one of the highly collinear variables, were estimated. The results suggest that financial crisis has adversely impacted India’s GDP although imports, exports and FDI were found to have exercised stimulating influence through technological spillovers and other externalities. The paper suggests that recovery of global economy is extremely important for Indian economic growth although the effects of global slow down could be minimized through the use of stimulant fiscal and monetary measures.The impact on the world economy; Impact on Indian Economy; Impact on External Sector; Data Sources and Methodology; Regression Analysis: Discussion and Interpretation; Seasonality test; Regression Results and discussion; Conclusions