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Effect of Sintering Temperature on the Micro Strain and Magnetic Properties of Ni-Zn Nanoferrites
D. Venkatesh,M. Siva Ram Prasad,B. Rajesh Babu,K. V. Ramesh,K. Trinath 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
In this study, nanocrystalline ferrite powders with the composition Ni0.5Zn0.5Fe₂O₄ were prepared by the autocombustion method. The obtained powders were sintered at 800℃, 900℃ and 1,000℃ for 4 h in air atmosphere. The as-prepared and the sintered powders were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and magnetization studies. An increase in the crystallite size and a slight decrease in the lattice constant with sintering temperature were observed, whereas microstrain was observed to be negative for all the samples. Two significant absorption bands in the wave number range of the 400 cm<SUP>?1</SUP> to 600 cm<SUP>?1</SUP> have been observed in the FT-IR spectra for all samples which is the distinctive feature of the spinel ferrites. The force constants were found to vary with sintering temperature, suggesting a cation redistribution and modification in the unit cell of the spinel. The M-H loops indicate smaller coercivity, which is the typical nature of the soft ferrites. The observed variation in the saturation magnetization and coercivity with sintering temperature has been attributed to the role of surface, inhomogeneous cation distribution, and increase in the crystallite size.
Daniel Popa,Jayapal Ramesh,Shajan Peter,C. Mel Wilcox,Klaus Mönkemüller 대한소화기내시경학회 2014 Clinical Endoscopy Vol.47 No.1
Self-expanding metal stents are a useful therapy to palliate malignant and benign luminal gastrointestinal obstruction. Self-expanding metal stents has been widely reported for colonic, esophageal, and gastric obstruction. However, endoscopic delivery and placement to the small bowel is more challenging and difficult. This case illustrates the usefulness and technical advantages of the balloon-overtube and enteroscopy technique for the palliative treatment of neoplastic stenosis affecting the small intestine.
Bathina Venkateswararao,Devarapalli Ramesh,García Márquez Fausto Pedro 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
An electrical power system is a vast interlocked network that needs a vigilant design to sustain the system with an uninterrupted power flow operation without any restrictions, called optimal power flow (OPF). OPF problem requires robust and fast optimization techniques to volve it due to its complexity. Cuckoo Search (CS) is one method that is being applied in OPF problems, and it has many advantages, e.g., ease use and littler tuning parameters. But it is not good enough, falling into local optimal resolutions and slow converges. Therefore, recently developed Grey Wolf Optimization (GWO) algorithm is used to solve OPF, but it has low accuracy and inadequate local searching ability. To overcome these problems, this paper proposed to combine CS with GWO to create a novel the Hybrid algorithm, called here HCSGWO. The main objective is to deduce the emission, true power generation cost, true power losses, and voltage stability, being a multi-objective problem. THCSGWO are validated by solving the OPF problem considering the calssic IEEE57 bus system. The results are compared with GWO and other algorithms employed in the literature.
Ramesh T.R.,Vijayaragavan M.,Poongodi M.,Mounir Hamdi,Huihui Wang,Sami Bourouis 한국통신학회 2022 ICT Express Vol.8 No.3
Vehicular ad hoc network (VANETs) has gained wide popularity such that it is necessary to incorporate trust among each node in the network. However, trust management among vehicles is a challenging task as malicious nodes are prone to disturb data transmission among different vehicles. The aim of this work is to establish the truth of consensus, to identify the malicious nodes with no further delay, by considering the decision of each vehicle on finding the trust values. The experimental analysis for the proposed approach done using the NS3 with CAIDA data set, the proposed scheme shows superior results compared to the other existing schemes for the detection rate of malicious nodes. It enhances the attack Detection Rate (DR) as 96.5% for the projected dual weighted trust evaluation technique. But, DR for the triumphing technique firecol is 74.9% and AODV is 60%. Thus, it is experimentally proved that dual weighted trust mechanism has high attack detection rate, comparatively. Also, proposed method outperforms very well with respect to the data transmission parameters like packet delivery ratio, energy Consumption and average latency comparatively over the existing mechanisms.
Ramesh M,Sujatha C. M 대한전자공학회 2018 IEIE Transactions on Smart Processing & Computing Vol.7 No.2
The current diagnostic evaluation criteria for Alzheimer’s disease (AD) are restricted to cognitive deficits, and less consideration is given to AD-related noncognitive, behavioral, and psychological symptoms of dementia. Vascular deterioration in AD subjects manifests neuropsychiatric symptoms (NPS). Early anxiety and depression are associated with cognitive decline. The brainstem undergoes deformation during the initiation of AD due to NPS. In this work, structural deformation of the brainstem is analyzed using Lattice Boltzmann criterion-based hybrid level set method (LSM) and fourth-order diffusion filtering. Contour and skeletal-based shape measures are extracted and analyzed using multilayer perceptron (MLP). Results show that the fourth-order diffusion filter provides strong edges, which aids in accurate segmentation. The Lattice Boltzmann criterion-based hybrid LSM is able to delineate the whole brainstem. Hough transform statistics (HTS) obtained from the segmented brainstem describe the geometric properties of the boundary of the brainstem. Eigen space values identify the skeletal variations of the brainstem for normal, Mild Cognitive Impairment (MCI), and AD subjects. Both HTS and eigen space features are found to represent better differentiation between normal, MCI, and AD subjects with a significance of p<0.05. It is observed that Hough transform–based statistical values have the ability to better discriminate the structural deformity of the brainstem with classification accuracies of 73%, 68%, and 71% for normal–MCI, MCI–AD, and normal–AD classifications, respectively, using MLP. Thus, this analysis identifies the presence of structural abnormality in the brainstem during the progression of AD, and therefore, this analysis could aid in early diagnosis of AD.
Sintering behavior and characteristic of bio-based hydroxyapatite coating deposited on titanium
M. A. Roudan,S. Ramesh,Y.H. Wong,H. Chandran,S. Krishnasamy,W.D. Teng,L.T. Bang 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
Deposition of hydroxyapatite derived from bio-waste eggshell on titanium substrate via electrophoretic deposition method andthe thermal stability of the resulting coating were investigated. The coated substrates was sintered at different temperatures ranging from 900 oC to 1100 oC in argon atmosphere prior to characterisation. The results indicated that a crack-free HA coating layer having an average thickness of 20 µm was successfully deposited at the optimum temperature of 1050 oC. The XRD analysis indicated that the sintered coated substrates was fully HA phase and was stable up to 1050 oC, with Ca/P ratioof 1.67. The SEM results showed that good bonding was achieved between the HA coating and the Ti substrate. There was also no secondary phase formation at the joint interface. This study demonstrate the viability of using electrophoretic deposition method to coat a thin layer of bio-based HA onto titanium without disrupting the biocompatibility nature of the HA phase.
M. Amuthasurabi,J. Chandradass,V Ramesh Babu,P.Baskara Sethupathi,M. Leenus Jesu Martin 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.11
We report on the performance of the thin film transistors (TFTs) using ZnO as an active channel layer grown by using radio frequency (rf) magnetron sputtering technique. The TFT device structure used in this study was a bottom gate type, which consists of SiNx as a gate insulator and indium tin oxide (ITO) as a gate deposited onto corning glass substrates. Electrical characteristics of the device showed clear saturation region without any output current degradation due to self heating effect. These ZnO TFTs had a saturation field effect mobility of about 2.14 cm2/Vs, an on to off ratio of greater than 105, the off current of less than 10−10 A and a threshold voltage of 15 V at a maximum device processing temperature of 350 oC. This TFT had a channel width of 300 μm and channel length of 30 μm. Moreover, the SiNx dielectric layer was found to be optimum for the high performance ZnO based TFTs because of the very low leakage current and good interface between the channel layer and gate material.
Development of New Productive Bivoltine Silkworm (Bombyx mori L.) Hybrid, APS83 X APS102
M. Ramesh Babu,H. Lakshmi,J. Prasad,J. Seetharamulu,Chandrashekharaiah 한국잠사학회 2005 International Journal of Industrial Entomology Vol.11 No.1
Successful silkworm breeding attempts were made at Andhra Pradesh State Sericulture Research and Development Institute (APSSRDI), Hindupur, India in developing productive bivoltine silkworm hybrids.One hundred hybrid combinations involving 10 parents (five each of oval and peanut) were evaluated in complete diallel pattern and identified the combination APS83 × APS102 as most promising. This hybrid showed economic merit for the characters fecundity (524 eggs/laying), pupation percentage (96.0%), cocoon yield per 10,000 larvae by weight (19.0 kg), cocoon weight (1.85 g), shell weight (41.7 cg), shell ratio (22.5%), filament length (1,004 m), reelability (88.4%),raw silk recovery (18.4%) and neatness (92 point) over the control hybrid APS9 × APS8. The breeding process and identification of APS83 × APS102 is discussed in the paper.