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RISS 인기검색어
- 검색키워드
- 저자 : M Z Kurien (검색결과 4 건)
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Doppler Shift Signature for a MCSs Selection in a VANET
Etienne Alain Feukeu,Karim Djouani,Anish Kurien 한국산학기술학회 2014 SmartCR Vol.4 No.6
The emergence of Intelligent Transportation Systems has given new hope and an unprecedented number of promising benefits to the transportation industry. However, these benefits are accompanied with inherent challenges due to the higher mobility of the vehicular nodes. One of the major problems faced is the induced Doppler shift in the carrier frequency of the transceiver node. This paper attempts to decrypt the effect of the Doppler shift impact in a Vehicle-to-Vehicle or Vehicle-to-Infrastructure communication system. Mobile nodes that are moving at a relative speed of 25 to 250 km/h are considered. Using a variable Modulation Code Scheme, the degradation effect in term of Bit Error Rate is analyzed under variable signal strength condition. Using the principle of Monte-Carlo, intense simulations are carried with a 95% Confidence Interval. Using the approximation technique, the results obtained from simulations prompted the derivation of a mathematical model. Considering the Bit Error Rate threshold limit defined by the standard, multiple simulation results are optimized to derive the composite result called the Doppler shift signature. A complete mathematical model of the Doppler shift signature accounting for all channel realizations when the Improved Direct Derivation Method is used in a Vehicular Ad-hoc Network is derived and compared against the actual. To assess and explore the effectiveness of the proposed model, several tests are conducted to evaluate the performance of the signature model against other existing rate adaptations, such as Adaptive Modulation Code, Binary phase-shift keying, and Constant. The results from simulation tests demonstrate that the proposed model in conjunction with the Improved Direct Derivation Method offers more than 200% improved throughput compared to its peers Adaptive Modulation Code, Binary phase-shift keying, and Constant.
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T.C.Manjunath,IITBombay,Sheelarani TB,CB Vinutha,MZ Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A novel chebyshev filter is designed in this paper and is used for reduction of the noises in the captured input signals which is further used for processing in the smart systems architecture,i.e., in the active vibration control of smart structures. This is the main objective of this paper.
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Best location for placement of collocated sensor / actuator pair on smart systems
T.C. Manjunath,IIT Bombay,Sheelarani T B,C B Vinutha,M Z Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Active vibration control is an important problem in structures. One of the ways to tackle this problem is to make the structure smart & intelligent by making use of certain materials called as smart materials (piezoelectrics, shape memory alloys, electrorheological fluids, PVDF, etc.). This paper features the mathematical modeling of a single input single output based Euler-Bernoulli smart beam & the usage of this mathematical model to suppress the active vibrations in it using 2 types of control laws, viz., the periodic output feedback control law & the fast output sampling feedback control law. The active vibration control concept along with the best location for the placement of the sensor / actuator pair on the smart systems is compared herewith & the conclusions are drawn. This is the main objective of this paper.
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Vibration Control of A Thin Walled Composite Beam Using PID Control Technique
T.C. Manjunath,IIT Bombay,Sheelarani T B,C B Vinutha,M Z Kurien 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper features the modeling and design of a PID controller to control the vibrations of a smart thin walled composite box beam. Collocated piezoelectric patches are bonded as sensor / actuator to the master structure at a certain finite element location on the beam, i.e., nearby the fixed end of the composite box beam. The beam structure is modeled in the state space form using the concept of piezoelectric theory, the Timoshenko beam theory and the Finite Element Method. The beam is subjected to an external disturbance (say, impulse or sine or random excitation). A novel PID controller is designed for the smart composite box beam. When the designed controller is put in the loop with the plant, i.e., the smart structure plant, the plant performs well and the vibrations are damped out in a quicker time. The performance of the designed controller is thus evaluated for vibration control and the conclusions are here by drawn. The simulation results show the effectiveness of the developed method. This is the main objective of this paper.
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