A Novel Modified Artificial Bee Colony for DOA Estimation

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Author(s): Seyed Ahmadreza Hashemi Parsa, Ataolah Ebrahim Zadeh, Seyed Javad Kazemitabar*.

Journal Name: International Journal of Sensors, Wireless Communications and Control

Abstract:

We consider the direction of arrival (DOA) estimation for code division multiple access (CDMA) signals. Solving this problem requires non-linear optimization and thus, speed of convergence becomes crucial. Evolutionary methods have proven to be effective in solving non-linear optimization problems. In this paper a novel modified artificial bee colony (MABC) has been proposed. We use second order Taylor series expansion of the cost function to ameliorate the search ability of artificial bee colony (ABC) for finding the globally optimal solution. The main idea is to harness the exploration and exploitation features. The optimum points of second order Taylor expansion of cost function is used as velocity factor of the ABC algorithm. The proposed technique is used for solving the DOA estimation problem of a CDMA system. Simulation results confirm the performance improvement of our proposed algorithm.

Keywords: Artificial Bee Colony, Direction of Arrival Estimation, Code Division Multiple Access, Second order Taylor series

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(E-pub Abstract Ahead of Print)
DOI: 10.2174/2210327909666191209154508
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MicroRNAs associated with overweight and obesity in childhood. Systematic review

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Author(s): Carlos Andrés Rico Flórez, Herney Andrés García-Perdomo*, Mildrey Mosquera Escudero.

Journal Name: MicroRNA

Abstract:

Background: Overweight and obesity prevalence has risen substantially in the last years. MicroRNAs (miRNAs) are factors that regulate gene expression through binding to a complementary sequence of mRNA.

Objective: To determine the association between the expression of miRNAs with the overweight and obesity in children.

Methods: We carried out a systematic review in Medline (Ovid), EMBASE, LILACS, and CENTRAL. We included clinical trials, cohort studies, cases and controls, and cross-section studies. We excluded quasi-experimental, prognostic studies, animal experiments, in silico studies, and studies using the adult population.

Results: We included seven studies (684 children). Three hundred sixty-one children have obesity/overweight, and 323 had normal weight, and 40.64% (278) were boys. The classification of obesity was inconsistent between the studies with several classifications used. A total of 65 miRNAs were reported to be associated with obesity and overweight, at least two references reported miR-122, miR-122-5p, miR-15b, miR15b-5p, miR191-5p, miR-222, miR-222-3p, miR 486, miR-486-3p, miR-486-5p. Blood samples were the most common samples used to measure the miRNAs, and the approaches to select the miRNAs were diverse, with four articles performing high-throughput techniques (sequencing and microarrays) before the validation of the miRNAs associated with obesity. Pathway analysis of the repeated miRNAs showed that they were involved in the regulation of metabolic and signaling pathways, including fatty acid metabolism.

Conclusion: miRNAs have potential as biomarkers of the development of pathologies such as obesity. We found a heterogeneous group of these molecules associated with obesity in children. We consider the miR-15b-5p, miR-486-5p, and hsa-miR-122-5p as good candidates for obesity biomarkers.

Keywords: Overweight, Obesity, Child, Microrna

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DOI: 10.2174/2211536609666191209152721
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Subject Area:Medical Sciences



Ultrasonic Block Compressed Sensing Imaging Reconstruction Algorithm Based on Wavelet Sparse Representation

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Author(s): Guangzhi Dai, Zhiyong He*, Hongwei Sun.

Journal Name: Current Medical Imaging
Formerly: Current Medical Imaging Reviews

Abstract:

Background: This study is carried out targeting the problem of slow response time and performance degradation of imaging system caused by large data of medical ultrasonic imaging.In view of the advantages of CS, it is applied to medical ultrasonic imaging to solve the above problems.

Objective: Under the condition of satisfying the speed of ultrasound imaging, the quality of imaging can be further improved to provide the basis for accurate medical diagnosis.

Methods: According to CS theory and the characteristics of array ultrasonic imaging system, block compressed sensing ultrasonic imaging algorithm is proposed based on wavelet sparse representation.

Results: Three kinds of observation matrices have been designed on the basis of the proposed algorithm, which can be selected to reduce the number of the linear array channels and the complexity of the ultrasonic imaging system to some extent.

Conclusion: The corresponding simulation program is designed, and the result shows that this algorithm can greatly reduce the total data amount required by imaging and the number of data channels required for linear array transducer to receive data. The imaging effect has been greatly improved compared with that of the spatial frequency domain sparse algorithm.

Keywords: Block Compressed Sensing, Ultrasonic Imaging, Sparse Representation, Wavelet Transformation, Phased Array, Image Reconstruction

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DOI: 10.2174/1573405615666191209151746
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Meet Our Editor-in-Chief

Author(s): Dimitra Hadjipavlou-Litina.

Journal Name: Medicinal Chemistry

Volume 16 , Issue 1 , 2020

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VOLUME: 16
ISSUE: 1
Year: 2020
Page: [2 - 3]
Pages: 2
DOI: 10.2174/157340641601191209150949



A literature review on planning and analysis of multi-stress accelerated life test for reliability assessment

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Author(s): Xiangxiang Zhang, Jun Yang*, Xuefeng Kong.

Journal Name: Recent Patents on Engineering

Abstract:

Background: Multi-stress accelerated life test (MALT) has obtained increasing attention in reliability assessment due to its advantages. Started with constant-stress ALT with two stress variables, MALT has developed a lot during the past decades. In MALT, design of test plan and data analysis are two crucial aspects. Numerous researchers have discussed these two aspects and some important methods of planning and data analysis for MALT are presented.

Methods: We first conducted a survey in the journal databases including Elsevier, Springer, IEEEXplore, Wiley and Taylor & Francis; and patent databases like Spacenet, USPTO and WIPO. Then we revised the literature including patents comprehensively on planning and analysis of multi-stress ALT.

Results: Optimal designs for MALT under different stress loadings are summarized, and different types of statistical inference methods are categorized and introduced. Finally, some challenges and research trends are discussed for future study.

Keywords: Δ9-tetrahydrocannabinol, cannabidiol, schizophrenia, rodent model, CB1, CB2, neuregulin, Multiple Stresses, Accelerated Life Test, Reliability Assessment, Optimal Designs, ALT Planning, Data Analysis

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DOI: 10.2174/1872212113666191209150647
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Foreword

Author(s): Dimitra Hadjipavlou-Litina.

Journal Name: Medicinal Chemistry

Volume 16 , Issue 1 , 2020

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VOLUME: 16
ISSUE: 1
Year: 2020
Page: [1 - 1]
Pages: 1
DOI: 10.2174/157340641601191209150546


Medicinal Chemistry

Editor-in-Chief:

Dimitra Hadjipavlou-Litina
Aristotle University of Thessaloniki
Thessaloniki
Greece

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Synbiotic Functional Malt Beverage Supplemented with Inulin and Probiotic Strains

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Author(s): Nayereh Zakipour, Leila Roozbeh Nasiraie, Amir Mohammad Mortazavian*, Nasim Khorshidian, Sara Sohrabvandi.

Journal Name: Current Nutrition & Food Science

Abstract:

Background: Cereal-based beverages can provide essential nutrients and phytochemicals as well as being suitable carriers for probiotics. Prebiotic ingredients present in grains or incorporated into beverages can improve the growth of probiotics leading to emerge of functional synbiotic beverages.

Objective: This study aimed to produce a malt-based synbiotic beverage containing inulin as a prebiotic and three strains of probiotics and evaluate its physiochemical and antioxidant properties during storage.

Methods: A synbiotic malt beverage containing 2.25% inulin and 2.25% sucrose with three probiotic strains including Lactobacillus acidophilus, Lactobacillus casei and Lactobacillus plantarum was produced and its chemical properties, antioxidant activity, total phenolic compounds and viability of probiotics were determined during 28 days of storage.

Results: The results showed that although the viability of probiotic bacteria in synbiotic malt beverage was decreased during refrigerated storage, it remained above 107 cfu/mL. The lowest and the highest viability was observed in the case of L. acidophilus and L. plantarum, respectively after 28 days of storage. pH, brix and total sugar decreased due to probiotic growth and activity. Ethanol concentration increased, but was lower than 0.1% in all samples and thus the final product can be considered as non-alcoholic. Moreover, the content of phenolic compounds was increased in samples with probiotics due to the hydrolysis of glycosylic phenolic compounds and generation of free phenolic compounds. The samples containing L. casei presented the highest total phenolic content followed by L. acidophilus and L. plantarum, respectively. Malt beverages containing L. casei showed the highest antioxidant activity followed by samples with L. acidophilus and L. plantarum.

Conclusion: It can be concluded that proper probiotic strains besides inulin as a prebiotic can be used for development of a functional synbiotic malt beverage with high phenolic content and antioxidant activity.

Keywords: Antioxidant Activity, Inulin, Malt Beverage, Probiotics, Symbiotic, Viability

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DOI: 10.2174/1573401315666191209145851
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