Syed Sajid Hussain  Jainy Sachdeva  Chirag Kamal Ahuja  Abhiav Singh 《International journal of imaging systems and technology》2023,33(2):465-482

The diagnosis' treatment planning, follow-up and prognostication of Gliomas is significantly enhanced on Magnetic Resonance Imaging. In the present research, deep learning-based variant of convolutional neural network methodology is proposed for glioma segmentation where pretrained autoencoder acts as backbone to the 3D-Unet which performs the segmentation task as well as image restoration. Further, Unet accepts input as the combination of three non-native MR images (T2, T1CE, and FLAIR) to extract maximum and superior features for segmenting tumor regions. Further, weighted dice loss employed, focusses on segregating tumor region into three regions of interest namely whole tumor with oedema (WT), enhancing tumor (ET), and tumor core (TC). The optimizer preferred in the proposed methodology is Adam and the learning rate is initially set to , progressively reduced by a cosine decay after 50 epochs. The learning parameters are reduced to a larger extent (up to 9.8 M as compared to 27 M). The experimental results show that the proposed model achieved Dice similarity coefficients: 0.77, 0.92, and 0.84; sensitivity: 0.90, 0.95, and 0.89; specificity: 0.97, 0.99, and 0.99; Hausdorff95: 5.74, 4.89, and 6.00, in the three regions including ET, WT, TC. This proposed Glioma segmentation method is efficient for segregation of tumors.  相似文献   

    

Deepika Agrawal  Sudhakar Pandey 《Concurrency and Computation》2023,35(26):e7833

The internet of things (IoT) has recently become extremely important in our lives. With the advancement in IoT, wireless sensor networks (WSNs) have gained much importance. In WSNs, the routing of clusters has gained more interest. However, there is still a problem with the hotspot. One way to address this issue is uneven clustering. In these, nodes closer to the base station have the smallest cluster size. It decreases the relay pressure of the nodes which are close to the base station. In this paper, the unequal clustering routing based on fuzzy logic and bat algorithm is proposed, that is, FUCBR. Relative intra-cluster costs and relative inter-cluster costs are used in a very innovative manner. Fuzzy logic is used to create unequal clusters while the bat algorithm is used for multi-hop routing. Unequal clustering minimizes the energy utilization for the member of the clusters. A novel probability technique is implemented in the cluster-forming process to allow cluster members to determine which cluster they wish to join. The bat algorithm's objective function is carefully chosen to optimize the cluster heads' energy usage. After simulation, it was discovered that the proposed algorithm utilizes less energy and extends the network lifespan. The simulation results show that FUCBR's performance is 30% more improved than fuzzy-based unequal clustering algorithm, genetic algorithm based unequal clustering and routing protocol, and grey wolf optimizer-C algorithms. It is suitable for networks that require a long life.  相似文献   

    

Abhishek Dhiman  Gulshan Sachdeva 《亚洲传热研究》2023,52(1):378-394

In the present research article, an indirect type solar cooking system has been developed for indoor cooking. In the proposed cooking system, a cooking pot has been placed at a distance of 5 m from the parabolic dish collector, and the heat has been transmitted from the collector to the cooking pot by means of heat transfer fluid. A gear pump of 40 W and insulated pipes have been used to circulate the fluid. A number of experiments have been performed to analyze the performance of the cooking system. During the investigation, the system achieved the temperature of the heat transfer fluid up to 175°C. The time taken for cooking the rice and the black grams has been observed 21 and 68min, respectively. The average thermal efficiency of the proposed system for the entire day has been achieved at 13.11%.  相似文献   

    

Gautam Rana;Ashish Sachdeva;M. Elangovan;Kulbhushan Sharma; 《International Journal of Numerical Modelling》2024,37(6):e70002

This work presents a FinFET-based stable, and low-power consuming static random access memory (SRAM) bit-cell that used eight transistors. The performance parameter of proposed feedback-cutting 8T (FC8T) is compared with four pre-published cell circuits, i.e., 6T, read-decoupled 8T(8TRD), Schmitt-trigger based 10T (10TST), and Schmitt-trigger-based modified 10 T (10TMST). The write power in proposed design is reduced by 1.36×/1.32×/1.88×/1.47× compared to 6T/8TRD/10TST/10TMST cells. The write and read stability of proposed design is improved by 1.15×/1.86×/1.28×/1.148× and 2.27×/1×/1.57×/1.11×, respectively. The proposed design also shows the low variability compared to other SRAM bit-cells.  相似文献   

    

Deepika Pathak  Sudhir Kumar Sharma  Vivek Singh Kushwah 《国际射频与微波计算机辅助工程杂志》2018,28(5)

This letter investigates an integrated antenna configuration for WLAN/WiMAX applications. The proposed composite antenna configuration is simply the grouping of ring dielectric resonator along with reformed square‐shaped slot antenna. Three significant characteristics of proposed article are: (1) aperture act as magnetic dipole and excite HE_11δ mode in ring dielectric resonator antenna; (2) reforming of square aperture generates orthogonal modes in ring DRA and creates CP in lower frequency band; (3) annular‐shaped Microstrip line along with reformed square aperture creates CP wave in upper frequency band. With the purpose of certifying the simulated outcomes, prototype of proposed structure is fabricated and tested. Good settlement is to be got between experimental and software generated outcome. Experimental outcomes show that the proposed radiating structure is operating over 2 frequency bands that is, 2.88‐3.72 and 5.4‐5.95 GHz. Measured 3‐dB axial ratio bandwidth in lower and upper frequency band is approximately 9.52% (3.0‐3.4 GHz) and 5.85% (5.64‐5.98 GHz), respectively. These outcomes indicate that the proposed composite antenna structure is appropriate for WLAN and WiMAX applications.  相似文献   

    

Sumit Sachdeva  Manjunath R. Venkatesh  Brahim El Mansouri  Jia Wei  Andre Bossche  Freek Kapteijn  Guo Qi Zhang  Jorge Gascon  Louis C. P. M. de Smet  Ernst J. R. Sudhölter 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(29)

The in situ electrochemical growth of Cu benzene‐1,3,5‐tricarboxylate (CuBTC) metal–organic frameworks, as an affinity layer, directly on custom‐fabricated Cu interdigitated electrodes (IDEs) is described, acting as a transducer. Crystalline 5–7 µm thick CuBTC layers are grown on IDEs consisting of 100 electrodes with a width and a gap of both 50 µm and a height of 6–8 µm. These capacitive sensors are exposed to methanol and water vapor at 30 °C. The affinities show to be completely reversible with higher affinity toward water compared to methanol. For exposure to 1000 ppm methanol, a fast response is observed with a capacitance change of 5.57 pF at equilibrium. The capacitance increases in time followed diffusion‐controlled kinetics (k = 2.9 mmol s^?0.5 g^?1_CuBTC). The observed capacitance change with methanol concentration follows a Langmuir adsorption isotherm, with a value for the equilibrium affinity K _e = 174.8 bar^?1. A volume fraction f _MeOH = 0.038 is occupied upon exposure to 1000 ppm of methanol. The thin CuBTC affinity layer on the Cu‐IDEs shows fast, reversible, and sensitive responses to methanol and water vapor, enabling quantitative detection in the range of 100–8000 ppm.  相似文献   

    

Varun Goyal  Shallu Gupta  Pal Dinesh Kumar  Deepika Jindal  Gokul Singh  Arun Agarwal  Prem Lata 《Propellants, Explosives, Pyrotechnics》2020,45(1):9-19

In this research work, a novel idea of using a pressure swirl single-fluid atomizer is used for the preparation of ultrafine 1,3,5-Trinitro-1,3,5-triazinane or formally cyclotrimethylenetrinitramine (RDX) explosive using the solvent/ anti-solvent method with reaching a milestone development of a numerical model to determine the particle size. A theoretical analysis is performed and referred to compute the optimum dimensions of the atomizer and a detailed numerical and experimental investigation is presented. Computer-Aided-Design (CAD) and Computational Fluid Dynamics (CFD) is used to model and simulate the flow of solvent through the atomizers in order to determine the most important parameters like the Sauter Mean Diameter (SMD) of the droplets, Turbulent Dissipation Rate, Turbulent Kinetic Energy and the exit velocity through the atomizer. Ultrafine RDX explosive is recrystallized with a mean particle size of 4.99 μm and a standard deviation of 1.35 μm. The experimental process performed using the fabricated atomizer is a laboratory scale table-top pilot plant which is simple, cost-effective, and safe. It is then observed that this numerical model accurately predicts the particle size from the designed atomizer when compared to the experimentally obtained particle size with the difference lying between 1 % and 5 %.  相似文献   

    

Deepika Deepika  Shiv Narayan  Sandeep Kaur 《Asian journal of control》2019,21(1):387-396

This paper proposes a new robust exponential sliding mode differentiator for estimating the (n ? 1) derivatives of a non‐linear function. Finite time convergence, robustness, and exactness are also ensured analytically with the proposed methodology. In addition, the results of the proposed sliding mode differentiator are extended to derive theorems for the novel state (SO) and extended state observers (ESO), which would estimate the system states as well as uncertainties recursively in finite time. Finally, three examples are implemented to validate the proposed methodologies and the obtained simulations are compared with the previously developed methods in literature.  相似文献   

    

Deepika Deepika  Sandeep Kaur  Shiv Narayan 《Asian journal of control》2019,21(4):2038-2048

This paper proposes a novel secondary frequency regulation technique for an uncertain islanded micro grid (MG). The major motivation of the work is to integrate the intrinsic robustness of the sliding mode control scheme with the disturbance observer to estimate and alleviate the unknown mismatched uncertainties caused by renewable resources and load variations. To this end, a dynamical sliding manifold is first utilized and then a control law is derived with Lyapunov's method which stabilizes the MG dynamics. Moreover, in order to ensure faster time domain responses of the closed‐loop system, we employ a power rate reaching law in our proposed control design. Thereafter, the performances of the introduced control strategy are tested on an islanded MG using MATLAB/Simulink, and robustness analysis is also carried out by considering five different case studies. Further, in contrast to the existing approaches such as robust H _∞ and robust PID control, the proposed strategy renders appealing time domain characteristics such as settling time, peak overshoot, and integral absolute frequency error.  相似文献   

    

Sharma Dileepkumar Ramlal  Jainy Sachdeva  Chirag Kamal Ahuja  Niranjan Khandelwal 《International journal of imaging systems and technology》2019,29(2):146-160

This research proposes an improved hybrid fusion scheme for non-subsampled contourlet transform (NSCT) and stationary wavelet transform (SWT). Initially, the source images are decomposed into different sub-bands using NSCT. The locally weighted sum of square of the coefficients based fusion rule with consistency verification is used to fuse the detailed coefficients of NSCT. The SWT is employed to decompose approximation coefficients of NSCT into different sub-bands. The entropy of square of the coefficients and weighted sum-modified Laplacian is employed as the fusion rules with SWT. The final output is obtained using inverse NSCT. The proposed research is compared with existing fusion schemes visually and quantitatively. From the visual analysis, it is observed that the proposed scheme retained important complementary information of source images in a better way. From the quantitative comparison, it is seen that this scheme gave improved edge information, clarity, contrast, texture, and brightness in the fused image.  相似文献