Controller Design for Automated Drug Delivery Unit

Vol. 2 No. 4

Year: 2012

Issue: June-August

Title: Controller Design for Automated Drug Delivery Unit 

Author Name: Vipeesh P, N.J.R. Muniraj 

Synopsis: 

Disease classification and drug diffusion are the two major tasks that have to be performed by automated drug delivery unit. Both these operations have to be performed with utmost care and the performance of the system should be reliable and reproducible. The electrical signals that are produced by the sensor array network, that indicate the concentration of analyte solution based on the kind of disease being detected, is used as the input to the classification problem. The developed model is used for classification cancer data obtained from the sensor array network. In this paper design of controller for drug diffusion is also presented. Both the novel algorithm based expert system and the controller logic for drug diffusion to measure and analyze the real time performance of the system. A detailed discussion on the design, modelling and implementation of the expert system and drug delivery unit is presented.

Disturbance Rejection of Nanopositioner Using Internal Model Control

Vol. 2 No. 4

Year: 2012

Issue: June-August

Title: Disturbance Rejection of Nanopositioner Using Internal Model Control 

Author Name: Sheilza Jain, Maneesha Garg, A. Swarup 

Synopsis: 

Nanopositioning, the precise control and manipulation of devices and materials at nanoscale, plays an important role in all applications of nanotechnology. Nanopositioners are designed to move objects over a small range with a resolution down to a fraction of an atomic diameter.  The primary objectives of nanopositioners include fast response with very little or no overshoot, large travel range, very high resolution, extremely high precision and high bandwidth.   Performance characteristics of the system can be improved by the use of feedback controller. Complexity of controller depends upon model of the plant/process and objectives of the control system. The primary objectives of control system are to obtain fast and accurate set point tracking as well as efficient disturbances rejection. The Internal model control (IMC) structure is a suitable control system for satisfying these objectives. This paper presents the identification of nanopositioning device and analyzes its open loop behavior.  The IMC scheme is implemented on non-minimum phase nanopositioning devices and is verified for set point changes and disturbance rejection. The proposed control scheme possesses good robustness against set point changes and disturbance rejection. In this paper, performance specifications of nanopositioning system with IMC structure are also compared with traditional PID controller tuning algorithms. Results simulated on MATLAB demonstrate its effectiveness and versatility for precise positioning. 

Parametric Influence on Noise in High Electron Mobility Transistor LNA

Vol. 2 No. 3

Year: 2012

Issue: Mar-May

Title: Parametric Influence on Noise in High Electron Mobility Transistor LNA 

Author Name: V.J.K. Kishor Sonti, V. Kannan 

Synopsis: 

In this paper, parametric influence on noise in HEMT LNA designed using FR4 substrate was analyzed. At higher frequencies of operation high electron mobility transistor designs are often influenced by shot noise and this shot noise is depended on different parameters of the device. This design is carried out at a centre frequency of 5.8GHz and critical parameters like gate resistance, transconductance; gate source biasing values influence on noise immunity of this design is analyzed in the frequency range of 1GHz to 10GHz. Variation of Maximum Gain and Noise Figure w.r.t to frequency were obtained for different parametric values. Obtained results had given better understanding of the noise influence on the design performance under different constraints pertained to parameter variation. These observations are in greater agreement with the theoretical facts. This work is carried out using ADS simulation software.

  

 

 

 

 

 

   

  

 

     

Investigations of Current Mechanisms and Electronic Properties of Schottky Barrier Diode

Vol. 2 No. 3

Year: 2012

Issue: Mar-May

Title: Investigations of Current Mechanisms and Electronic Properties of Schottky Barrier Diode 

Author Name: Wagah F. Mohammad, Nada Nabil Khatib 

Synopsis: 

The energy band diagram and space charge regions of Schottky barrier (SB) solar cells are different from normal pn solar cells.  Many facts and theories must be studied and developed to assist understanding and implementing SB solar cells.  Few samples of SB devices were prepared by thermal deposition under vacuum then tested and studied carefully.  An interfacial layer was introduced between metal and semiconductor.  I-V and C—V are measured, drawn and discussed in details.  The current transportation mechanism of the prepared samples is found to be of thermal mechanism type.  The current transportation depends on the potential barrier height.  From C— V characteristics, it is found that the potential barrier height is decreased as the interfacial oxide becomes thicker.

Low Power Reconfigurable Vlsi Architecture For Fir Filters

Vol. 2 No. 3

Year: 2012

Issue: Mar-May

Title: Low Power Reconfigurable Vlsi Architecture For Fir Filters 

Author Name: S. Karthick, R.Nirmal Kumar, S.Valarmathy 

Synopsis: 

Reconfigurability and low complexity are the two key requirements of finite impulse response (FIR) filters. Two new efficient reconfigurable architectures namely constant shift method (CSM) and programmable shift method (PSM) of low complexity are used for design of higher order finite impulse response (FIR) filters. The FIR filter architecture is capable of operating for different wordlength filter coefficients without any overhead in hardware circuitry. The CSM results in higher speed whereas the PSM results in lower area. These methods are based on the binary common subexpression elimination (BCSE) algorithm using canonical signed digit (CSD) representation of coefficients. The CSD representation is widely used in implementing multiple constant multiplication because it guarantees the least number of additions for a given constant multiplication. Hence the CSM architecture is used for high speed applications and the PSM architecture is used in applications where area and power have to be minimized. The experimental results are synthesized and major parameters like area, delay, power are compared for both CSM and PSM architecture using Xilinx ISE 8.1tool.

 

 

 

 

   

  

 

     

Harmonic Optimization of Multilevel Inverters Using Hybrid GA/PSO

Year: 2012

Issue: Mar-May

Title: Harmonic Optimization of Multilevel Inverters Using Hybrid GA/PSO 

Author Name: Suryakalavathi, K. Mahendran , B. Indhumathy 

Synopsis: 

This paper presents Hybrid GA/PSO optimization (HGAPSO) technique applied to determine the switching angles of a cascaded multilevel inverter. This technique eliminates specified higher order harmonics while maintaining the required fundamental voltage. This technique can be applied to multilevel inverters with any number of levels. As an example, in this paper an eleven-level inverter is considered and the optimum switching angles are calculated offline to eliminate the 5th, 7th, 11th and 13th order harmonics. The simulation is carried out in MATLAB/Simulink package. Results show that the proposed method does effectively eliminate a great number of specific harmonics and the output voltage is resulted in low total harmonic distortion (THD).

FIR Filter Approach for Gene Prediction

Year: 2012

Issue: Mar-May

Title: FIR Filter Approach for Gene Prediction 

Author Name: Renu Sharma, Ajay Kaushik , Neeraj Sharma 

Synopsis: 

Gene prediction is a very challenging problem in the field of medical science. Gene constitute of exons and introns. Exons are responsible for encoding of proteins. The main target of gene prediction is to identify the exons. Gene identification can be done on the basis of property of codon structure that exons exhibits period-3 behavior. To identify the period-3 property, signal processing is used which uses numerical indicator sequences to process the data. This is the reason to convert the characters sequences of DNA sequences into numerical sequences (Binary indicator sequence, paired indicator sequence, real indicator sequence) and then pass through the FIR filter. The present research shows that the FIR filter gives accurate results for selected frequency range.