Reduced rank MIMO-OFDM channel estimation for high speed railway communication using 4D GDPS sequences

Farnoosh Talaei,Xiaodai Dong 한국통신학회 2017 ICT Express Vol.3 No.4

This paper presents a reduced rank channel estimator for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) high speed railway (HSR) systems. Conventional interpolation based channel estimators require high pilot load for robust estimation of the rapidly time varying frequency-selective MIMO-OFDM HSR channel. To relax the high pilot overhead requirement, we take advantage of the channel’s restriction to low dimensional subspaces due to the time, frequency and spatial correlation and propose a low complexity linear minimum mean square error (LMMSE) channel estimator. The channel estimator utilizes a four-dimensional (4D) basis expansion channel model obtained from band-limited generalized discrete prolate spheroidal (GDPS) sequences. Simulation results validate that the mean square estimation error of the proposed estimator is smaller than that of the conventional interpolation based least square (LS) estimator and the performance is robust to different delay, Doppler and angular spreads.

An Automated Approach for Optimal Design of Prestressed Concrete Slabs using PSOHS

A. S. Talaei,A. Nasrollahi,M. Ghayekhloo 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3

In this paper a new automated approach is presented for optimal design of prestressed concrete slabs. To achieve this goal, the model of a slab is formed using SAP2000, and it is linked to a meta-heuristic code. This code utilizes the result of analyzed models in each iteration to provide new design parameters of the slab for the subsequent one. Canadian Standard Association requirements are met thoroughly to reach a safe code-based design. A recently enhanced version of Particle Swarm Optimization (PSO), so-called PSOHS, is employed, and it is shown that the latter is superior to the standard PSO. Results prove the efficiency of the PSOHS, indicating the possibility of its application in professional engineering. Furthermore, the comparison of the PSO and PSOHS shows that PSOHS is less parameter sensitive, and provides final designs with smaller cost functions.

Targeting HSP90 Gene Expression with 17-DMAG Nanoparticles in Breast Cancer Cells

Mellatyar, Hassan,Talaei, Sona,Nejati-Koshki, Kazem,Akbarzadeh, Abolfazl Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5

Background: Dysregulation of HSP90 gene expression is known to take place in breast cancer. Here we used D,L-lactic-co-glycolic acid-polyethylene glycol-17-dimethylaminoethylamino-17-demethoxy geldanamycin (PLGA-PEG-17DMAG) complexes and free 17-DMAG to inhibit the expression of HSP90 gene in the T47D breast cancer cell line. The purpose was to determine whether nanoencapsulating 17DMAG improves the anti-cancer effects as compared to free 17DMAG. Materials and Methods: The T47D breast cancer cell line was grown in RPMI 1640 supplemented with 10% FBS. Encapsulation of 17DMAG was conducted through a double emulsion method and properties of copolymers were characterized by Fourier transform infrared spectroscopy and H nuclear magnetic resonance spectroscopy. Assessment of drug cytotoxicity was by MTT assay. After treatment of T47D cells with a given amount of drug, RNA was extracted and cDNA was synthesized. In order to assess HSP90 gene expression, real-time PCR was performed. Results: Taking into account drug load, IC50 was significant decreased in nanocapsulated 17DMAG in comparison with free 17DMAG. This finding was associated with decrease of HSP90 gene expression. Conclusions: PLGA-PEG-17DMAG complexes can be more effective than free 17DMAG in down-regulating of HSP90 expression, at the saesm time exerting more potent cytotoxic effects. Therefore, PLGA-PEG could be a superior carrier for this type of hydrophobic agent.

Effects of Platelet-Rich Plasma on Kidney Regeneration in Gentamicin-Induced Nephrotoxicity

Abbas Moghadam,,Tahereh Talaei-Khozani,Afsaneh Mafi,Mohammad Reza Namavar,Farzaneh Dehghani 대한의학회 2017 Journal of Korean medical science Vol.32 No.1

Platelet-rich plasma (PRP) as a source of growth factors may induce tissue repairing and improve fibrosis. This study aimed to assess the effects of PRP on kidney regeneration and fibrosis in gentamicin (GM)-induced nephrotoxicity rat model by stereological study. Thirty-two male rats were selected. Nephrotoxicity was induced in animals by administration of GM (80 mg/kg/daily, intraperitoneally [IP], 8 day) and animals were treated by PRP (100 µL, intra-cortical injection using surgical microscopy, single dose). Blood samples were collected for determine blood urea nitrogen (BUN) and creatinine (Cr) before and after PRP therapy. At the end of experiment, right kidneys were sectioned by Isotropic Uniform Random (IUR) method and stained with H & E and Masson’s Trichrome. The stereological methods were used for estimating the changes in different structures of kidney. PRP increased the number of epithelial cells in convoluted tubules, and decreased the volume of connective tissue, renal corpuscles and glomeruli in GM-treated animals (P < 0.05). Our findings indicate that PRP had beneficial effects on proliferation of epithelial cells in convoluted tubules and ameliorated GM-induced fibrosis.

Role of cuticle-degrading enzymes of Beauveria bassiana and Metarhizium anisopliae in virulence on Plodia interpunctella (Lepidoptera, Pyralidae) larvae

Golzan Seyedeh Reyhaneh,Talaei-Hassanloui Reza,Homayoonzadeh Mohammad,Safavi Seyed Ali 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2

Entomopathogenic fungi (EPF) are important biological control agents in pest management programs in agroecosystems against insect pests. EPF such as Beauveria bassiana (Bals.) Vuillemin and Metarhizium anisopliae (Metchn.) Sorokin produce a wide range of extracellular enzymes involved in disturbance of the first barrier in the insect cuticle comprising proteins, chitin, and lipids. Realizing relationships between the expression of these enzymes and fungal virulence might aid in development of effective mycoinsecticides. The virulence of B. bassiana (isolates TV and OZ1) and M. anisopliae (isolate CS1) were investigated on Plodia interpunctella (Hübner) larvae in this study. The third instar larvae were immersed in a suspension containing 1 × 108 conidia mL− 1 of fungal conidial inoculum. The results revealed that all three fungal isolates caused mortality in larvae, but there was a considerable variation in their virulence. Total proteinase, exochitinase and lipase assays were done for these isolates. The TV isolate with the highest mortality with 41.7%, had the highest level of specific activity of exochitinase, protease, and lipase with 0.148, 0.654, and 0.190 U. mg− 1 protein, respectively. In the current study, a positive correlation was determined between the virulence of fungal isolates and the activities of protease and lipase, but this link was not significant for exochitinase. Our results demonstrated that extracellular enzymes, particularly protease and lipase, may play a crucial role in the virulence of these fungal isolates against P. interpunctella larvae.

Application of couple sparse coding ensemble on structural damage detection

Fallahian, Milad,Khoshnoudian, Faramarz,Talaei, Saeid Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.1

A method is proposed to detect structural damages in the presence of damping using noisy data. This method uses Frequency Response Function (FRF) and Mode-Shapes as the input parameters for a system of Couple Sparse Coding (CSC) to study the healthy state of the structure. To obtain appropriate patterns of FRF for CSC training, Principal Component Analysis (PCA) technique is adopted to reduce the full-size FRF to overcome over-fitting and convergence problems in machine-learning training. To verify the proposed method, a numerical two-story frame structure is employed. A system of individual CSCs is trained with FRFs and mode-shapes, and then termed ensemble to detect the health condition of the structure. The results demonstrate that the proposed method is accurate in damage identification even in presence of up to 20% noisy data and 5% unconsidered damping ratio. Furthermore, it can be concluded that CSC ensemble is highly efficient to detect the location and the severity of damages in comparison to the individual CSC trained only with FRF data.

Childhood cutaneous leishmaniasis

Safar Ali TALARI,Rezvan TALAEI,Gholamreza SHAJARI,Zarichehr VAKILI,Abbas TAGHAVIARDAKANI 대한기생충학열대의학회 2006 The Korean Journal of Parasitology Vol.44 No.4

New puzzles in precipitation microphysics revealed by the Multi Angle Snowflake Camera

Tim Garrett,Ahmad Talaei,Kyle Fitch,Logan Hill 한국기상학회 2018 한국기상학회 학술대회 논문집 Vol.2018 No.10

Host preference of Encarsia formosa (Hym.:Aphelinidae) towards untreated and Lecanicillium longisporum-treated Trialeurodes vaporariorum (Hem.: Aleyrodidae)

M. Fazeli-Dinan,R. Talaei-Hassanloui,H. Allahyari 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.4

The host preference in Encarsia formosawas studiedwhen parasitoid receiving signals related to either untreated and Lecanicillium longisporum-treated Trialeurodes vaporariorum. The experiments were done by the type two selection experiment. The third instar nymphs of T. vaporariorum were used as parasitoid host. Untreated hosts sprayed with Tween 80 as control and treated host infected by the three isolates of L. longisporum; LRC190, LRC216 and LRC229. Simultaneously, the healthy hosts were presented to parasitoid with the infected hosts at four time intervals: 0, 24, 48 and 72 h post-treatment. This investigation showed a highly significant preference of E. formosa towards the untreated host at 24, 48 and 72 h after fungi spraying.Whereas in 0 h after fungi treatment parasitoids could not discriminate between healthy and infected host therefore, therewas not a preference to host selection. The highest Manly's preference index (β) of parasitoid to choose healthy hosts in the simultaneous presence of infected hosts by isolates LRC190, LRC216 and LRC229 was estimated 0.88±0.02, 0.87±0.02 and 0.79±0.03, respectively at 72 h after spraying,while the lowest valuewas estimated 0.44±0.03, 0.49±0.4 and 0.52 ± 0.03, respectively, at 0 h after treatment. Overall we concluded that female parasitoid is capable recognize infected host in longer time intervals after treatment and prefers to lay on the uninfected ones. These results demonstrated the suitable adaptation of simultaneous application of E. formosa and L. longisporum for biological control of T. vaporariorum.

Impact of Metabolic Syndrome on Response to Medical Treatment of Benign Prostatic Hyperplasia

Ali Cyrus,Ali Kabir,Davood Goodarzi,Afsaneh Talaei,Ali Moradi,Mohammad Rafiee,Mehrdad Moghimi,Elham Shahbazi,Elaheh Farmani 대한비뇨의학회 2014 Investigative and Clinical Urology Vol.55 No.12

Purpose: To investigate the effect of metabolic syndrome (MetS) on the response to medicaltherapy of benign prostatic hyperplasia (BPH) after a 3-month period of treatment. Materials and Methods: This was a cohort study of 100 patients, 47 with MetS and 53without MetS, referred to either the primary care unit or referral hospital with BPHwho had moderate lower urinary tract symptoms of prostate involvement and were candidatesfor medical treatment. Our main outcome was response to medical treatmentwith prazosin 1 mg twice a day and finasteride 5 mg daily in patients with BPH on thebasis of International Prostate Symptom Score (IPSS). Multivariate analysis of covariancewas used to compare BPH treatment response in patients with and withoutMetS before and after receiving treatment. Results: The mean volume of the prostate was significantly higher in MetS patientsthan in patients without MetS (57±32.65 mL compared with 46.00±20.19 mL, p=0.036). The control group demonstrated an 11-unit reduction in IPSS, whereas those with MetSshowed a reduction in the symptom score of only 6 units (p<0.001). Regarding the componentsof MetS separately, triglyceride (p<0.001), fasting blood sugar (p=0.001), andwaist circumference (p=0.028) significantly affected the clinical progression of BPH. The observational nature of this study may be a limitation in comparison with an interventionalstudy. Conclusions: The results of the present study showed that MetS can negatively affectthe response to medical treatment of BPH. Therefore, it is necessary to consider MetSin selecting patients with BPH for drug therapy.