PULI ASHOK KUMAR
@cbit.ac.in
ASSISTANT PROFESSOR, ELECTRONICS AND COMMUNICATION ENGINEERING
Chaitanya Bharathi Institute of Technology, Gandipet, Hyderabad, Telangana, PIN : 500075
RESEARCH INTERESTS
VLSI System Design, Reconfigurable Antennas, RF MEMS Switches, Reconfigurable MEMS Filters, MEMS Accelerometers, MEMS Sensors, BIO – SENSORS, MEMS based Energy Harvesters and Microfluidics, MEMS based Drug Delivery Systems.
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
S.V.V. Satyanarayana, P. Ashok Kumar, K. Baboji, and M. Priyadharshni
Elsevier BV
G. Shanthi, Y. Vishwakanth, L. Dharma Teja, P. Ashok Kumar, and Aruru Sai Kumar
IEEE
Mobile Communication systems use turbo codes for correcting errors. As compared to other error correction codes, turbo codes provide great error correcting capabilities. The design of the low-power Turbo decoder in this paper is suggested as a (VLSI) Very Large-Scale Integration architecture. Inter-leavers, de-inter-leavers, and soft-in-soft-out decoders are utilized on the decoder's side, which uses the (MAP) maximum-a-posterior-algorithm. The usage of the MAP algorithm reduces Number of iterations necessary to decode the information bits being transferred. This research employs an encoder component consisting of two recursive convolutional encoders and a pseudorandom interleaved on the encoder side. The Xilinx ISM tool is used to do the Turbo encoding and decoding. The clock gating method is utilized to decrease the dissipation of power in the circuit, the simulation results show before clock gating the power dissipated in the circuit was around 112m Watts, later After using clock gating in the circuit the power dissipation is reduced to around 32m Watts. we can observe the timing, clock, power, and area reports at the end of simulations and synthesis. This research is implemented by synthesizing results from Xilinx ISM and Quartus tools to know the power analysis report. By using the clock gating technique area of the circuit might increase but the power is reduced for good performance of the circuit.
Pranav Rangole, Prabhat Kumar, and A. V. Ravi Teja
IEEE
In this paper, the rotor position at rest and running operation is estimated using the high-frequency voltage injection approach. A method for estimating starting position that was previously established was based on high-frequency voltage injection in all phases has also been extended to include predicting rotor position during standstill circumstances. The switched reluctance motor's sole idle phase is used to implement the newly designed rotor position estimation method by injecting a high-frequency voltage pulse. This method is discussed about estimating the initial rotor position by injecting a voltage pulse into all phases for a very short time, and after applying a voltage into all phases, a short current peak occurred, but inductance of the all phases differed due to the variable reluctance machine, and those peak points are fetched and based on those current peaks, changes in peak current reveal the relationship between rotor position, the initial rotor position is derived. The switched reluctance motor can be started and operated with an integrated method of rotor position estimation at a standstill and running. The proposed method is validated by MATLAB/Simulink and hardware setup.
Srinivasa Rao Karumuri, P. Ashok Kumar, Girija Sravani Kondavitee, and Aime Lay-Ekuakille
Institute of Electrical and Electronics Engineers (IEEE)
This paper presents an approach to evaluate capacitance developed by perforated membrane of RF MEMS switch with high accuracy. An analytical model is developed for both upstate and downstate of switch by including parasitic and fringing field capacitance in parallel plate capacitance model. The proposed analytical model includes the ligament efficiency term directly in the formula which reduce the efforts to calculate it individually for various perforation sizes. The capacitance analysis has been carried out by varying the physical parameters to optimize the switch dimensions and these analytical results are compared with the simulation results carried out by 3D FEM tool COMSOL multiphysics for validation. The proposed analytical model results are then compared with benchmark models to understand the efficiency of proposed model in estimating the up and downstate capacitances. The proposed analytical model proved to be good with less error percentage of 2.13% at upstate and 2.59% at downstate whereas the other benchmark models gives greater than 5% error. The switch is then fabricated using 4-mask surface micromachining process and experimental evaluation of capacitance at both upstate and downstate is carried out by DC probe station. Experimentally, the upstate capacitance is obtained as 37.4 fF and downstate as 2.43 pF and the analytical models exhibited low error percentage of 3.95% at upstate and 2.05% at downstate condition for µ = 0.5.
Gouri Shankar Gurjar, Prabhat Kumar, Bhwani Partap Singh, Dalip Singh, and Virendra Sharma
Springer Nature Singapore
P. Ashok Kumar, Srinivasa Rao Karumuri, Girija Sravani Kondavitee, and Koushik Guha
Springer Science and Business Media LLC
K. Srinivasa Rao, P. Naveena, T. V. Aravind Swamy, P. Ashok Kumar, Koushik Guha, and K. Girija Sravani
Springer Science and Business Media LLC
Virendra Sharma, Jayesh Verma, Pravin Sonwane, Harsh Sharma, Aditya Gupta, and Prabhat Kumar
IEEE
Microgrid base hybrid power system has emerged as cost-effective and sustainable solution for domestic/rural electrification. Paper presents new control strategy based self-governed photovoltaic, wind and battery system. Proposed system is integrated at common DC/AC bus. The system is delivered balance power through common coupling point (CCP) under highly unbalanced loads on AC bus/load bus. The inverter controller is responsible for maintaining the supply voltage at CCP by adjusting the DC bus voltage. The hybrid solar-wind system is supplying the power to utility load is success fully execute for all-possible loads by the test system ON/OFF with ON/OFF grid. this proposed work, also evaluate quality of power in terms of total harmonics distortions (THDs) that give the great achievement and success fully execute for test conditions with performance index more than 5 %. The study has been carried out in MATLAB environment.
Virendra Sharma, Kavita Rawat, Gaurav Jain, Nishant Agrawal, Shaaz Rizvi, and Prabhat Kumar
IEEE
The article presents an approach to use of optimize hybrid RE-power (OHREP) from fuel cell-solar plants (FCSP) with storage to reduce energy demand of consumer loads. FCSP integrated with battery is implemented for testing of utility network loads by circuit breaker for switching at 0.1s. The RE-sources rated capacity of 6 kW of PV and 50 kW of Fuel Cell and battery are connected with network loads using dc to dc & dc-ac inverter and evaluate the instantaneous power across load as well as the performance of load parameters at grid level through simulink results. Hence hybrid solar-fuel cell RE-source system is supplying the power to utility network is success fully execute for all loads by occurring event ON/OFF for test conditions with performance index more than 1 %. The study has been carried out in MATLAB environment.
Rooban S., Prasanna D. Lakshmi, Teja K.B.S. Durga, and Kumar P.V. Mani
Totem Publisher, Inc.
K. Srinivasa Rao, Shaik Shoukat Vali, P. Ashok Kumar, and K. Girija Sravani
Springer Science and Business Media LLC
K. Srinivasa Rao, B. V. S. Sailaja, K. V. Vineetha, P. Ashok Kumar, Koushik Guha, and K. Girija Sravani
Springer Science and Business Media LLC
K. Srinivasa Rao, P. Ashok Kumar, Koushik Guha, B. V. S. Sailaja, K. V. Vineetha, K. L. Baishnab, and K. Girija Sravani
Springer Science and Business Media LLC
K. Srinivasa Rao, Sk. Shoukath Vali, K. Girija Sravani, P. Ashok Kumar, and Koushik Guha
Springer Singapore
K. Srinivasa Rao, J. Sateesh, Koushik Guha, K. L. Baishnab, P. Ashok, and K. Girija Sravani
Springer Science and Business Media LLC
Ram Naresh Mishra, D. K. Chaturvedi, and Prabhat Kumar
Springer Science and Business Media LLC
P. Ashok Kumar, K. Srinivasa Rao, and K. Girija Sravani
Springer Science and Business Media LLC
K. Srinivasa Rao, B. Mohitha reddy, V. Bala Teja, G. V. S. Krishnateja, P. Ashok Kumar, and K. S. Ramesh
Springer Science and Business Media LLC
K. Srinivasa Rao, Md. Hamza, P. Ashok Kumar, and K. Girija Sravani
Springer Science and Business Media LLC
K. Srinivasa Rao, P. S. Mounika, P. Pavan, V. Guru, N. Dinesh, P. Ashok Kumar, K. Vineetha, and K. Girija Sravani
Springer Science and Business Media LLC
Prabhat Kumar and Vishal Shrivastava
Auricle Technologies, Pvt., Ltd.
Research on autonomous vehicle system has risen in the past couple of years. It has posed challenges to the researchers to develop an understanding about the real time scenarios. Deep Learning has demonstrated its extraordinary computational potential by transcending its abilities into more complex areas, where pattern matching, image recognition and behavioral cloning plays a vital role.
 The system consists of Image Processing and analyzing of the training data into behavioral cloning of the vehicle in a simulated environment. A control algorithm responsible for consolidating the sub systems calculations of the correct steering angle is used to keep the vehicle within the lane markings of the road. The solution proposed requires a better data collection and data interpretation. Addition of cloud computing fastens the data calculation and hence improves the performance of the system.
K. Srinivasa Rao, Ch. Gopi Chand, K. Girija Sravani, D. Prathyusha, P. Naveena, G. Sai Lakshmi, P. Ashok Kumar, and T. Lakshmi Narayana
Institute of Electrical and Electronics Engineers (IEEE)
This paper illustrates the design, modeling, and analysis of bridge type structure based capacitive RF MEMS switch with different beam thickness and materials. We have used Ashby’s approach to select the best materials in each and every level which helped to improve the overall performance of the switch in terms of mechanical, electrical, and RF properties. Silicon Nitride thin film (<inline-formula> <tex-math notation="LaTeX">$\\varepsilon _{\\mathrm {r}}= 7.8$ </tex-math></inline-formula>) is used as a dielectric material. The beam structure stiffness is analyzed with different materials, such as gold, titanium, and platinum, within these materials gold with high thermal conductivity and Euler–Young’s modulus of 77 GPa is offering the best performance. Incorporation of meanders and perforations to the membrane helped to reduce the pull-in voltage. The proposed switch is offering very low pull-in voltage of 1.9 V. The deflection of beam thickness is tabulated for the three materials among them the 2 <inline-formula> <tex-math notation="LaTeX">$\\mu \\text{m}$ </tex-math></inline-formula> thickness is best beam thickness for the switch for X-band applications. The switch offers best return loss (S<sub>11</sub>) of −21.36 dB, insertion loss (S<sub>12</sub>) of −0.147 dB, and isolation (S<sub>21</sub>) of −52.04 dB at 8GHz. The switch presented in this paper is preferable in X-band applications.
K. Girija Sravani, D. Prathyusha, K. Srinivasa Rao, P. Ashok Kumar, G. Sai Lakshmi, Ch. Gopi Chand, P. Naveena, Lakshmi Narayana Thalluri, and Koushik Guha
Institute of Electrical and Electronics Engineers (IEEE)
This paper deals with the study of dimple type RF MEMS capacitive shunt switch using different meandering techniques for high isolation and low actuation voltage. The novelty of the proposed RF MEMS switch is it incorporates the meanders and dimples, which help to reduce the actuation voltage. The proposed switch structure is optimized, designed, and simulated with FEM analysis such as electromechanical and electromagnetic by using COMSOL and HFSS tools respectively. The best performance of the switch is observed by varying different parameters such as beam material, beam thickness, dielectric thickness, and airgap. The proposed switch with different meandering techniques attains the pull-in voltage in the range of 10.3–46 V, particularly the three uniform meander technique has low actuation voltage of 10.3 V. The RF performance of the device is particularly tuned in the range of 26.5–40 GHz frequency range and it is analyzed for all types of meanders. Among them, the non-uniform single meander has attained the best isolation of −54.13 dB at 40 GHz in the off state. The insertion and return losses of the device are −0.514 dB and −17.35 dB over 1–40 GHz frequency in on state.
K. Srinivasa Rao, B. V. S. Sailaja, K. Girija Sravani, K. V. Vineetha, P. Ashok Kumar, D. Prathyusha, G. Sai Lakshmi, C. H. Gopi Chand, and Koushik Guha
Institute of Electrical and Electronics Engineers (IEEE)
Movable suspended microstructures are common features of sensors and devices in the field of micro electro mechanical systems (MEMS). This paper addresses the study of approach to model the capacitance for the crab-type meander-based RF MEMS shunt switch with etching holes on the beam. The presented paper evaluates the parallel-plate capacitance and fringing-field capacitance caused by the etching holes on the beam and introduces empirical formulae. From the literature study, an accurate empirical formula is presented. The capacitance involves a parallel plate and a fringing field. The parallel-plate capacitance term is proposed by the authors of this work; the fringing-field capacitance term is adopted from previous work. The proposed accurate empirical capacitance formulae are derived by curve fitting the simulated values through the commercially available FEM solver. The two existing benchmark models of fringing-field capacitance are used to modify the perforated MEMS switch to obtain the proposed formula. With the existing models and presented formula, the capacitances are computed for a wide range of dimensions; the simulated results of the presented formula are validated with the calculated results. The deviation of the presented formula has an error estimation of ±0.1%. The variation of the capacitance with different deictic thicknesses and errors is estimated and analyzed for the presented formula. The Mejis model is found to be satisfactory for a lower air gap and a 1-<inline-formula> <tex-math notation="LaTeX">$\\mu \\text{m}$ </tex-math></inline-formula>-thick beam. The Yang’s model is sufficient for a higher air gap and a large number of etching holes. The proposed formulae are good for the ligament efficiency <inline-formula> <tex-math notation="LaTeX">$\\mu \\le 0.5$ </tex-math></inline-formula>, with thickness <inline-formula> <tex-math notation="LaTeX">$> 1~\\mu \\text{m}$ </tex-math></inline-formula>, and the deviation of error estimation is within ±5%.
Pramod Kumar, Jitendra Kumar, Utkarsh, Shailendra Singh, and Santanu Dwari
Springer Science and Business Media LLC