7,036 research outputs found
An Optimal Algorithm for the Maximum-Density Segment Problem
We address a fundamental problem arising from analysis of biomolecular
sequences. The input consists of two numbers and and a
sequence of number pairs with . Let {\em segment}
of be the consecutive subsequence of between indices and
. The {\em density} of is
. The {\em maximum-density
segment problem} is to find a maximum-density segment over all segments
with . The best
previously known algorithm for the problem, due to Goldwasser, Kao, and Lu,
runs in time. In the present paper, we solve
the problem in O(n) time. Our approach bypasses the complicated {\em right-skew
decomposition}, introduced by Lin, Jiang, and Chao. As a result, our algorithm
has the capability to process the input sequence in an online manner, which is
an important feature for dealing with genome-scale sequences. Moreover, for a
type of input sequences representable in space, we show how to
exploit the sparsity of and solve the maximum-density segment problem for
in time.Comment: 15 pages, 12 figures, an early version of this paper was presented at
11th Annual European Symposium on Algorithms (ESA 2003), Budapest, Hungary,
September 15-20, 200
"An Econometric Analysis of SARS and Avian Flu on International Tourist Arrivals to Asia"
This paper compares the impacts of SARS and human deaths arising from Avian Flu on international tourist arrivals to Asia. The effects of SARS and human deaths from Avian Flu will be compared directly according to human deaths. The nature of the short run and long run relationship is examined empirically by estimating a static line fixed effect model and a difference transformation dynamic model, respectively. Empirical results from the static fixed effect and difference transformation dynamic models are consistent, and indicate that both the short run and long run SARS effect have a more significant impact on international tourist arrivals than does Avian Flu. In addition, the effects of deaths arising from both SARS and Avian Flu suggest that SARS is more important to international tourist arrivals than is Avian Flu. Thus, while Avian Flu is here to stay, its effect is currently not as significant as that of SARS.
Quantum Critical Spin-2 Chain with Emergent SU(3) Symmetry
We study the quantum critical phase of a SU(2) symmetric spin-2 chain
obtained from spin-2 bosons in a one-dimensional lattice. We obtain the scaling
of the entanglement entropy and finite-size energies by exact diagonalization
and density-matrix renormalization group methods. From the numerical results of
the energy spectrum, central charge, and scaling dimension we identify the
conformal field theory describing the whole critical phase to be the SU(3)
Wess-Zumino-Witten model. We find that while in the whole critical phase the
Hamiltonian is only SU(2) invariant, there is an emergent SU(3) symmetry in the
thermodynamic limit
Iterative Scale-Up ExpansionIoU and Deep Features Association for Multi-Object Tracking in Sports
Multi-object tracking algorithms have made significant advancements due to
the recent developments in object detection. However, most existing methods
primarily focus on tracking pedestrians or vehicles, which exhibit relatively
simple and regular motion patterns. Consequently, there is a scarcity of
algorithms that address the tracking of targets with irregular or non-linear
motion, such as multi-athlete tracking. Furthermore, popular tracking
algorithms often rely on the Kalman filter for object motion modeling, which
fails to track objects when their motion contradicts the linear motion
assumption of the Kalman filter. Due to this reason, we proposed a novel online
and robust multi-object tracking approach, named Iterative Scale-Up
ExpansionIoU and Deep Features for multi-object tracking. Unlike conventional
methods, we abandon the use of the Kalman filter and propose utilizing the
iterative scale-up expansion IoU. This approach achieves superior tracking
performance without requiring additional training data or adopting a more
robust detector, all while maintaining a lower computational cost compared to
other appearance-based methods. Our proposed method demonstrates remarkable
effectiveness in tracking irregular motion objects, achieving a score of 75.3%
in HOTA. It outperforms all state-of-the-art online tracking algorithms on the
SportsMOT dataset, covering various kinds of sport scenarios
BIOMECHANICAL ANALYSIS DURING COUNTERMOVEMENT JUMP IN CHILDREN AND ADULTS
This study was to examine the biomechanical characteristics of children and adults during countermovement jump. Seven children and seven adult males were recruited to the study. A Peak high-speed camera (120Hz) synchronized with a force plate (600Hz) were used to record vertical jumping action. The kinetic parameters were calculated by using inverse dynamic method. Results showed that the children had both immature joint function prior to propulsion and inadequate knee and ankle joints function during propulsion. It is concluded that a lack of form in jumping strategy was performed during vertical jumpings in the children's group in terms of the kinetic methods was performed. This information may be used in following studies about countermovement jump, avoiding some important information needed only by kinematic analysis, it will be more complete to apply kinetic analysis for children movement researches
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