2,044 research outputs found
Ubiquitous Smart Home System Using Android Application
This paper presents a flexible standalone, low-cost smart home system, which
is based on the Android app communicating with the micro-web server providing
more than the switching functionalities. The Arduino Ethernet is used to
eliminate the use of a personal computer (PC) keeping the cost of the overall
system to a minimum while voice activation is incorporated for switching
functionalities. Devices such as light switches, power plugs, temperature
sensors, humidity sensors, current sensors, intrusion detection sensors,
smoke/gas sensors and sirens have been integrated in the system to demonstrate
the feasibility and effectiveness of the proposed smart home system. The smart
home app is tested and it is able to successfully perform the smart home
operations such as switching functionalities, automatic environmental control
and intrusion detection, in the later case where an email is generated and the
siren goes on.Comment: 11 pages, 10 figure
Application of cepstrum analysis and linear predictive coding for motor imaginary task classification
In this paper, classification of electroencephalography (EEG) signals of motor imaginary tasks is studied using cepstrum analysis and linear predictive coding (LPC). The Brain-Computer Interface (BCI) competition III dataset IVa containing motor imaginary tasks for right hand and foot of five subjects are used. The data was preprocessed by applying whitening and then filtering the signal followed by feature extraction. A random forest classifier is then trained using the cepstrum and LPC features to classify the motor imaginary tasks. The resulting classification accuracy is found to be over 90%. This research shows that concatenating appropriate different types of features such as cepstrum and LPC features hold some promise for the classification of motor imaginary tasks, which can be helpful in the BCI context
Predicting MoRFs in protein sequences using HMM profiles
Background: Intrinsically Disordered Proteins (IDPs) lack an ordered three-dimensional structure and are enriched in
various biological processes. The Molecular Recognition Features (MoRFs) are functional regions within IDPs that
undergo a disorder-to-order transition on binding to a partner protein. Identifying MoRFs in IDPs using computational
methods is a challenging task.
Methods: In this study, we introduce hidden Markov model (HMM) profiles to accurately identify the location of
MoRFs in disordered protein sequences. Using windowing technique, HMM profiles are utilised to extract features from
protein sequences and support vector machines (SVM) are used to calculate a propensity score for each residue. Two
different SVM kernels with high noise tolerance are evaluated with a varying window size and the scores of the SVM
models are combined to generate the final propensity score to predict MoRF residues. The SVM models are designed
to extract maximal information between MoRF residues, its neighboring regions (Flanks) and the remainder of the
sequence (Others).
Results: To evaluate the proposed method, its performance was compared to that of other MoRF predictors;
MoRFpred and ANCHOR. The results show that the proposed method outperforms these two predictors.
Conclusions: Using HMM profile as a source of feature extraction, the proposed method indicates improvement in
predicting MoRFs in disordered protein sequence
Two-dimensional Laplacianfaces method for face recognition
In this paper we propose a two-dimensional (2D) Laplacianfaces method for face recognition. The new algorithm is developed based on two techniques, i.e., locality preserved embedding and image based projection. The 2D Laplacianfaces method is not only computationally more efficient but also more accurate than the one-dimensional (1D) Laplacianfaces method in extracting the facial features for human face authentication. Extensive experiments are performed to test and evaluate the new algorithm using the FERET and the AR face databases. The experimental results indicate that the 2D Laplacianfaces method significantly outperforms the existing 2D Eigenfaces, the 2D Fisherfaces and the 1D Laplacianfaces methods under various experimental conditions
Brain wave classification using long short - term memory based OPTICAL predictor
Brain-computer interface (BCI) systems having the ability to classify brain waves with greater accuracy are highly desirable. To this end, a number of techniques have been proposed aiming to be able to classify brain waves with high accuracy. However, the ability to classify brain waves and its implementation in real-time is still limited. In this study, we introduce a novel scheme for classifying motor imagery (MI) tasks using electroencephalography (EEG) signal that can be implemented in real-time having high classification accuracy between different MI tasks. We propose a new predictor, OPTICAL, that uses a combination of common spatial pattern (CSP) and long short-term memory (LSTM) network for obtaining improved MI EEG signal classification. A sliding window approach is proposed to obtain the time-series input from the spatially filtered data, which becomes input to the LSTM network. Moreover, instead of using LSTM directly for classification, we use regression based output of the LSTM network as one of the features for classification. On the other hand, linear discriminant analysis (LDA) is used to reduce the dimensionality of the CSP variance based features. The features in the reduced dimensional plane after performing LDA are used as input to the support vector machine (SVM) classifier together with the regression based feature obtained from the LSTM network. The regression based feature further boosts the performance of the proposed OPTICAL predictor. OPTICAL showed significant improvement in the ability to accurately classify left and right-hand MI tasks on two publically available datasets. The improvements in the average misclassification rates are 3.09% and 2.07% for BCI Competition IV Dataset I and GigaDB dataset, respectively. The Matlab code is available at https://github.com/ShiuKumar/OPTICAL
2-Bromo-5,7-dimethÂoxy-4-phenylÂquinoline
The title compound, C17H14BrNO2, was synthesized by the treatment of 5,7-dimethÂoxy-4-phenylÂquinolin-2-one with phosphoryl bromide in a Vilsmeier-type reaction. There are two independent molÂecules (A and B) in the asymmetric unit which differ by 11.2° in the orientation of the 4-phenyl ring with respect to the planar quinoline ring system [dihedral angles = 55.15 (8) and 66.34 (8)° in molÂecules A and B, respectively]. In the crystal structure, the independent molÂecules are linked via C—H⋯N and C—H⋯O hydrogen bonds, forming centrosymmetric tetraÂmeric units which are cross-linked through C—H⋯π and C—Br⋯π interÂactions with Br⋯centroid distances of 3.4289 (8) and 3.5967 (8) Å
Model Building and Phenomenology of Flux-Induced Supersymmetry Breaking on D3-branes
We study supersymmetry breaking effects induced on D3-branes at singularities
by the presence of NSNS and RR 3-form fluxes. First, we discuss some local
constructions of chiral models from D3-branes at singularities, as well as
their global embedding in flux compactifications. The low energy spectrum of
these constructions contains features of the supersymmetric Standard Model. In
these models, both the soft SUSY parameters and the mu-term are generated by
turning on the 3-form NSNS and RR fluxes. We then explore some
model-independent phenomenological features as, e.g., the fine-tuning problem
of electroweak symmetry breaking in flux compactifications. We also comment on
other phenomenological features of this scenario.Comment: 41 pages, 10 figure
Orientifolds, RG Flows, and Closed String Tachyons
We discuss the fate of certain tachyonic closed string theories from two
perspectives. In both cases our approach involves studying directly
configurations with finite negative tree-level cosmological constant. Closed
string analogues of orientifolds, which carry negative tension, are argued to
represent the minima of the tachyon potential in some cases. In other cases, we
make use of the fact, noted in the early string theory literature, that strings
can propagate on spaces of subcritical dimension at the expense of introducing
a tree-level cosmological constant. The form of the tachyon vertex operator in
these cases makes it clear that a subcritical-dimension theory results from
tachyon condensation. Using results of Kutasov, we argue that in some
Scherk-Schwarz models, for finely-tuned tachyon condensates, a minimal model
CFT times a subcritical dimension theory results. In some instances, these two
sets of ideas may be related by duality.Comment: 15 pages, 2 figures, uses harvmac; v2: references adde
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