On-line analysis/synthesis-based channel parameters estimation and wideband CDMA receiver design verification

2006 ◽  
Author(s):  
K. Cheikhrouhou ◽  
S. Affes ◽  
A. Elderini ◽  
B. Smida ◽  
P. Mermelstein ◽  
...  
Keyword(s):  
Parameters Estimation ◽  
Receiver Design ◽  
Design Verification ◽  
Wideband Cdma ◽  
Channel Parameters ◽  
On Line ◽  
Line Analysis ◽  
Cdma Receiver

scholarly journals Design Verification and Performance Evaluation of an Enhanced Wideband CDMA Receiver Using Channel Measurements

2005 ◽  
Vol 2005 (11) ◽  
Author(s):  
Karim Cheikhrouhou ◽  
Sofiène Affes ◽  
Ahmed Elderini ◽  
Besma Smida ◽  
Paul Mermelstein ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Design Verification ◽  
Channel Measurements ◽  
Wideband Cdma ◽  
And Performance ◽  
Cdma Receiver

Non Linear State and Parameters Estimation in Chemical Processes: Analysis and Improvement of Three Estimation Structures Applied to a CSTR

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Héctor Botero ◽  
Hernán Álvarez
Keyword(s):  
Parameter Estimation ◽  
Chemical Process ◽  
Chemical Processes ◽  
The State ◽  
Convergence Speed ◽  
Parameters Estimation ◽  
State Variables ◽  
Input Output ◽  
On Line ◽  
Linear State

This paper proposes a new composite observer capable of estimating the states and unknown (or changing) parameters of a chemical process, using some input-output measurements, the phenomenological based model and other available knowledge about the process. The proposed composite observer contains a classic observer (CO) to estimate the state variables, an observer-based estimator (OBE) to obtain the actual values of the unknown or changing parameters needed to tune the CO, and an asymptotic observer (AO) to estimate the states needed as input to the OBE. The proposed structure was applied to a CSTR model with three state variables. With the proposed structure, the concentration of reactants and other CSTR parameters can be estimated on-line if the reactor and jacket temperatures are known. The procedure for the design of the proposed structure is simple and guarantees observer convergence. In addition, the convergence speed of state and parameter estimation can be adjusted independently.

First on-line analysis of petroleum from single inclusion using ultrafast laser ablation

2010 ◽  
Vol 41 (2) ◽  
pp. 74-77 ◽  
Author(s):  
Herbert Volk ◽  
David Fuentes ◽  
Alexander Fuerbach ◽  
Christopher Miese ◽  
Wolfgang Koehler ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ultrafast Laser ◽  
Single Inclusion ◽  
On Line ◽  
Line Analysis ◽  
Ultrafast Laser Ablation

On-line Flow Cytometry for Real-time Surgical Guidance

Neurosurgery ◽  
2004 ◽  
Vol 55 (3) ◽  
pp. 551-561 ◽  
Author(s):  
Ali H. Mesiwala ◽  
Louis D. Scampavia ◽  
Peter S. Rabinovitch ◽  
Jaromir Ruzicka ◽  
Robert C. Rostomily
Keyword(s):  
Decision Making ◽  
Real Time ◽  
Dna Content ◽  
Time Frame ◽  
Tissue Samples ◽  
Surgical Decision ◽  
Surgical Guidance ◽  
On Line ◽  
Surgical Decision Making ◽  
Line Analysis

Abstract OBJECTIVE: This study tests the feasibility of using on-line analysis of tissue during surgical resection of brain tumors to provide biologically relevant information in a clinically relevant time frame to augment surgical decision making. For the purposes of establishing feasibility, we used measurement of deoxyribonucleic acid (DNA) content as the end point for analysis. METHODS: We investigated the feasibility of interfacing an ultrasonic aspiration (USA) system with a flow cytometer (FC) capable of analyzing DNA content (DNA-FC). The sampling system design, tissue preparation requirements, and time requirements for each step of the on-line analysis system were determined using fresh beef brain tissue samples. We also compared DNA-FC measurements in 28 nonneoplastic human brain samples with DNA-FC measurements in specimens of 11 glioma patients obtained from central tumor regions and surgical margins after macroscopically gross total tumor removal to estimate the potential for analysis of a biological marker to influence surgical decision making. RESULTS: With minimal modification, modern FC systems are fully capable of real-time, intraoperative analysis of USA specimens. The total time required for on-line analysis of USA specimens varies between 36 and 63 seconds; this time includes delivery from the tip of the USA to complete analysis of the specimen. Approximately 60% of this time is required for equilibration of the DNA stain. When compared with values for nonneoplastic human brain samples, 50% of samples (10 of 20) from macroscopically normal glioma surgical margins contained DNA-FC abnormalities potentially indicating residual tumor. CONCLUSION: With an interface of existing technologies, DNA content of brain tissue samples can be analyzed in a meaningful time frame that has the potential to provide real-time information for surgical guidance. The identification of DNA content abnormalities in macroscopically normal tumor resection margins by DNA-FC supports the practical potential for on-line analysis of a tumor marker to guide surgical resections. The development of such a device would provide neurosurgeons with an objective method for intraoperative analysis of a clinically relevant biological parameter that can be measured in real time.

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