Search results for "REPRESENTATION"
showing 10 items of 1710 documents
Exploiting a list of protein sequences
2007
Abstract: We describe a software program to help exploit a database of aligned protein sequences. In addition to the classical lists of sequences, a graphical representation is used to get a better overview of the information. As natural parameters, the type of amino acid and sequence position are used. Various plots or 3D representations are then updated. Examples are shown based on globin sequences from various species and on the abnormal human hemoglobins. The software should be of interest to protein engineers who need to know what variants are already known.
The Blaumanis Moment: National Literature Enters the Stage of Art
2012
My aim in this article is to discuss the literary field in Latvia slightly before 1900. More specifically, I want to focus on the particular situation when literature written in the Latvian language ceases to be a product of didactic intention and moralizing value, and makes the crucial step in recognizing its rights to submerge into primarily aesthetic issues. It is also the moment when the personality of the author cuts through the still mostly realistic surface of literary works, making him (or her) be perceived as unmistakably present, even if this move often remains unnoticed by most contemporary and even later observers.1 The author who in my article represents this departure, which u…
Posets That Locally Resemble Distributive Lattices
2000
Abstract Let P be a graded poset with 0 and 1 and rank at least 3. Assume that every rank 3 interval is a distributive lattice and that, for every interval of rank at least 4, the interval minus its endpoints is connected. It is shown that P is a distributive lattice, thus resolving an issue raised by Stanley. Similar theorems are proven for semimodular, modular, and complemented modular lattices. As a corollary, a theorem of Stanley for Boolean lattices is obtained, as well as a theorem of Grabiner (conjectured by Stanley) for products of chains. Applications to incidence geometry and connections with the theory of buildings are discussed.
Character correspondences in blocks with normal defect groups
2014
Abstract In this paper we give an extension of the Glauberman correspondence to certain characters of blocks with normal defect groups.
Distributed evolutionary approach to data clustering and modeling
2014
In this article we describe a framework (DEGA-Gen) for the application of distributed genetic algorithms for detection of communities in networks. The framework proposes efficient ways of encoding the network in the chromosomes, greatly optimizing the memory use and computations, resulting in a scalable framework. Different objective functions may be used for producing division of network into communities. The framework is implemented using open source implementation of MapReduce paradigm, Hadoop. We validate the framework by developing community detection algorithm, which uses modularity as measure of the division. Result of the algorithm is the network, partitioned into non-overlapping co…
Compactness of Fourier integral operators on weighted modulation spaces
2019
Using the matrix representation of Fourier integral operators with respect to a Gabor frame, we study their compactness on weighted modulation spaces. As a consequence, we recover and improve some compactness results for pseudodifferential operators.
Are There Essentially Incomplete Knowledge Representation Systems?
2001
A mathematical model of a knowledge representation system (KR-system) is proposed. Its prototype is the concept of an information system in the sense of Z. Pawlak; however, the model is, in fact, a substantial extension of the latter. In our model, attributes may form an arbitrary category, where morphisms represent built-in functional dependencies, and uncertainty of knowledge is treated in terms of category theory via monads. Several notions of simulation are also considered for such KR-systems. In this general setting, the semiphilosophical problem mentioned in the title, still open, is given a precise meaning.
Housing Memories in Riga: WWI and Its Aftermath—Representation of the Apartment in Soviet Cinema and Now
2020
Geography of film provides information on new historiographic perspectives in architecture, space and the imagination of urban environment. This chapter contributes to the field of human geography by conducting a content analysis of a vast number of films made between the early 1910s and present time focusing on development and spatial organization of living spaces in Riga. The research elucidates the construction of meaning of space and housing memory, where relations of dominance is defined and contested in visual representation of Riga’s apartments. A qualitative research methodology was used based on best practices of human geography data transcription and coding. The main findings show…
Efficient formulation of Multimode Equivalent Networks for 2-D waveguide steps through Kummer's transformation
2017
In this paper we present a new and improved formulation for the Multimode Equivalent Network (MEN) representation of arbitrary waveguide junctions. In the new formulation the Kummer's transformation is used to separate the kernel into dynamic and static parts, by introducing higher order extraction terms. The main difference with respect to the old formulation is that the approximation of the kernel is more accurate and the numerical computations are more efficient. In addition to theory, both formulations are compared in terms of efficiency and convergence thereby fully validating the proposed new formulation.
Efficient Computation of Multiscale Entropy over Short Biomedical Time Series Based on Linear State-Space Models
2017
The most common approach to assess the dynamical complexity of a time series across multiple temporal scales makes use of the multiscale entropy (MSE) and refined MSE (RMSE) measures. In spite of their popularity, MSE and RMSE lack an analytical framework allowing their calculation for known dynamic processes and cannot be reliably computed over short time series. To overcome these limitations, we propose a method to assess RMSE for autoregressive (AR) stochastic processes. The method makes use of linear state-space (SS) models to provide the multiscale parametric representation of an AR process observed at different time scales and exploits the SS parameters to quantify analytically the co…