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With the rapidly increasing reliance of life sciences research on digital data and sophisticated computational analysis techniques, the ability to reproduce findings generated by in-silico data analysis workflows is of increasing importance to the scientific community. However, challenges to reproducibility arise from the heterogeneity of approaches available to workflow definition and enactment....
We describe an efficient contour generation scheme implemented on a general purpose graphics processing unit (GPU) which extracts multiple contours in parallel from a high resolution multivalued image or depth map. In this paper, we describe an extension of a two stage crack based contour generation on GPU whose performance is hampered by horizontal dependencies generated when a contour crosses a...
In this work, we report an ongoing study that aims to apply cluster validation measures for analyzing email communications at an organizational level of a company. This analysis can be used to evaluate the company structure and to produce further recommendations for structural improvements. Our initial evaluations, based on data in the forms of emails logs and organizational structure for a large...
For any n-bit boolean function f, we show that the randomized communication complexity of the composed function f o g^n, where g is an index gadget, is characterized by the randomized decision tree complexity of f. In particular, this means that many query complexity separations involving randomized models (e.g., classical vs. quantum) automatically imply analogous separations in communication complexity.
A Getz-Masden dynamic system 2 (GMDS2) is investigated in this paper. For the purpose of solving time-varying complex matrix inverse, we propose a TZ-type (i.e., Taylor-Zhang type) discrete Getz-Masden dynamic system 2; i.e., the proposed TZ-type discrete Getz-Masden dynamic system 2 is discretized by Taylor-Zhang discretization formula. The results of numerical experiments not only show the efficacy...
This paper considers the observer design problem for the SISO Lur'e differential inclusion system. The feature of the observer lies that it does not hold any set-valued mappings. Different from the current works, the system with relative degree more than one is studied in this paper, and the observer is constructed by the filtering transformation method. A numerical example is simulated to show the...
Owing to its simplicity and efficacy, orthogonal matching pursuit (OMP) has been a popular sparse representation method for compressed sensing and pattern classification. As a recent extension of OMP, generalized OMP (GOMP) improves the efficiency of OMP by identifying multiple atoms each iteration. Nonetheless, GOMP utilizes the mean square error (MSE) criterion as the loss function, which has been...
One of the main issues related to the online distance learning courses is the method employed in order to connect students and professors. Two main forms of communication are normally chosen (or combined): synchronous and asynchronous. This paper aims to analyze the impressions of students and professors about the usage of both methods of communication on the specific context of Final Year Project...
The deletion channel takes as input a bit string x ∊ {0,1}^n, and deletes each bit independently with probability q, yielding a shorter string. The trace reconstruction problem is to recover an unknown string x ∊ from many independent outputs (called traces) of the deletion channel applied to x.We show that if x is drawn uniformly at random and q
In an Intelligent Tutoring System (ITS), the graphical user interface is the main mode of interaction between the program and the user. Thus, it is important to evaluate its usability, which is the system's efficiency and ease of use. For these evaluations, methods such as Nielsen heuristics and questionnaires are more recurrent. However, such procedures cannot detect problems that were not foreseen...
Modularity is an evaluation measure for graph clustering. Louvain method is constructed by local optimization for modularity and is bottom up method as well as agglomerative hierarchical clustering. Cluster validity measures are used to evaluate cluster partitions as well as modularity. They are traditional evaluation measures in the field of clustering. We propose a novel graph clustering which is...
Clustering ensemble approaches usually have more accurate, robust and stable results than traditional single clustering approaches. However, clustering ensemble can still be improved in the following aspects: (1) improve the diversity of subspaces; (2) employ probabilistic latent clustering; (3) adopt the internal latent factor analysis before the consensus function. Therefore, we propose a new clustering...
Previous labeled random finite set filter developments use a target motion model that only accounts for survival and birth. While such a model provides the means for a multi-target tracking filter such as the Generalized Labeled Multi-Bernoulli filter to capture target births and deaths in a wide variety of applications, it lacks the capability to capture the lineages of spawned target tracks. In...
Compared with Zhang dynamics (ZD) method, gradient dynamics (GD) method, which is intrinsically feasible and efficient to solve time-invariant problems, could have a simpler hardware implementation. In this paper, different from conventional type-Z0G1 controller in Zhang-gradient (ZG) framework, which uses gradient descent of input vector, a type-Z0G1 controller using gradient descent of state vector...
The perfect Gaussian integer sequences, which satisfy the ideal periodic autocorrelation functions, are of practical interest in both orthogonal frequency division multiplexing (OFDM) systems and code division multiple access (CDMA) systems. In this work, we propose an infinity family of the perfect Gaussian integer sequences constructed from a multiple of the original Payne's o-polynomial. Experimental...
The use of technological resources in education has lead to positive changes in the elaboration of new methodologies, in this context technologies such as the Digital Interactive Whiteboard (DIW) can act by facilitating Learning. The mere presence of the DIW does not guarantee benefits for the student's learning process, that raises doubts about whether or not the resources available are used in a...
The nonlinear (second-degree) generalization of the linear J-orthogonal Schur parametrization/innovations and orthogonal stochastic modeling of second-order time-series to higher-(fourth-) order non-Gaussian time-series is proposed. The J-orthogonal realization of the nonlinear parametrization/innovations filter, and the orthogonal realization of the nonlinear modeling filter is presented.
As the volume of data stored by Big data and Cloud services continues to grow, both academia and industry are seeking for high-performance storage systems. Recently, with the recent advances in write-optimized indexes (WOI), WOI-based file systems can now outperform conventional file systems with orders of magnitude on random writes, metadata updates, and small file creation. Based on the B-tree structure,...
In tourism, it is necessary to promote sightseeing areas and tourist amenities as well as to encourage repeat visits by improving the tourists' levels of satisfaction. In this paper, we focus on impressions of sightseeing spots as an important factor in improving tourist satisfaction. Many studies have analyzed the relationship between tourists' impressions of a sightseeing area and their overall...
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