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Search Results: 1 - 10 of 1654 matches for " Abhijit Mandal "
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Non-Linear Canonical Correlation Analysis Using Alpha-Beta Divergence
Abhijit Mandal,Andrzej Cichocki
Entropy , 2013, DOI: 10.3390/e15072788
Abstract: We propose a generalized method of the canonical correlation analysis using Alpha-Beta divergence, called AB-canonical analysis (ABCA). From observations of two random variables, x ∈ R P and y ∈ R Q, ABCA finds directions, w x ∈ R P and w y ∈ R Q, such that the AB-divergence between the joint distribution of (w T x , w T y) and the product x y of their marginal distributions is maximized. The number of significant non-zero canonical coefficients are determined by using a sequential permutation test. The advantage of our method over the standard canonical correlation analysis (CCA) is that it can reconstruct the hidden non-linear relationship between w T xx and w T y, and it is robust against outliers. We extend ABCA when data are observed in terms of tensors. We further generalize this method by imposing sparseness constraints. Extensive simulation study is performed to justify our approach.
Optimization of machining parameters of turning operations based on multi performance criteria
Abhijit Saha,N.K.Mandal
International Journal of Industrial Engineering Computations , 2013,
Abstract: The selection of optimum machining parameters plays a significant role to ensure quality of product, to reduce the manufacturing cost and to increase productivity in computer controlled manufacturing process. For many years, multi-objective optimization of turning based on inherent complexity of process is a competitive engineering issue. This study investigates multi-response optimization of turning process for an optimal parametric combination to yield the minimum power consumption, surface roughness and frequency of tool vibration using a combination of a Grey relational analysis (GRA). Confirmation test is conducted for the optimal machining parameters to validate the test result. Various turning parameters, such as spindle speed, feed and depth of cut are considered. Experiments are designed and conducted based on full factorial design of experiment.
Experience of wireless local area network in a radiation oncology department
Mandal Abhijit,Asthana Anupam,Aggarwal Lalit
Journal of Cancer Research and Therapeutics , 2010,
Abstract: The aim of this work is to develop a wireless local area network (LAN) between different types of users (Radiation Oncologists, Radiological Physicists, Radiation Technologists, etc) for efficient patient data management and to made easy the availability of information (chair side) to improve the quality of patient care in Radiation Oncology department. We have used mobile workstations (Laptops) and stationary workstations, all equipped with wireless-fidelity (Wi-Fi) access. Wireless standard 802.11g (as recommended by Institute of Electrical and Electronic Engineers (IEEE, Piscataway, NJ) has been used. The wireless networking was configured with the Service Set Identifier (SSID), Media Access Control (MAC) address filtering, and Wired Equivalent Privacy (WEP) network securities. We are successfully using this wireless network in sharing the indigenously developed patient information management software. The proper selection of the hardware and the software combined with a secure wireless LAN setup will lead to a more efficient and productive radiation oncology department.
Development of an electronic radiation oncology patient information management system
Mandal Abhijit,Asthana Anupam,Aggarwal Lalit
Journal of Cancer Research and Therapeutics , 2008,
Abstract: The quality of patient care is critically influenced by the availability of accurate information and its efficient management. Radiation oncology consists of many information components, for example there may be information related to the patient (e.g., profile, disease site, stage, etc.), to people (radiation oncologists, radiological physicists, technologists, etc.), and to equipment (diagnostic, planning, treatment, etc.). These different data must be integrated. A comprehensive information management system is essential for efficient storage and retrieval of the enormous amounts of information. A radiation therapy patient information system (RTPIS) has been developed using open source software. PHP and JAVA script was used as the programming languages, MySQL as the database, and HTML and CSF as the design tool. This system utilizes typical web browsing technology using a WAMP5 server. Any user having a unique user ID and password can access this RTPIS. The user ID and password is issued separately to each individual according to the person′s job responsibilities and accountability, so that users will be able to only access data that is related to their job responsibilities. With this system authentic users will be able to use a simple web browsing procedure to gain instant access. All types of users in the radiation oncology department should find it user-friendly. The maintenance of the system will not require large human resources or space. The file storage and retrieval process would be be satisfactory, unique, uniform, and easily accessible with adequate data protection. There will be very little possibility of unauthorized handling with this system. There will also be minimal risk of loss or accidental destruction of information.
Clinical significance of cumulative biological effective dose and overall treatment time in the treatment of carcinoma cervix
Mandal Abhijit,Asthana Anupam,Aggarwal Lalit
Journal of Medical Physics , 2007,
Abstract: The purpose of this retrospective study is to report the radiotherapy treatment response of, and complications in, patients with cervical cancer on the basis of cumulative biologic effective dose (BED) and overall treatment time (OTT). Sixty-four (stage II - 35/64; stage III - 29/64) patients of cervical cancer were treated with combination of external beam radiotherapy (EBRT) and low dose rate intracavitary brachytherapy (ICBT). The cumulative BED was calculated at Point A (BED 10 ); and bladder, rectal reference points (BED 2.5 ) using the linear-quadratic BED equations. The local control (LC) rate and 5-year disease-free survival (DFS) rate in patients of stage II were comparable for BED 10 < 84.5 and BED 10 > 84.5 but were much higher for BED 10 > 84.5 than BED 10 < 84.5 ( P < 0.01) in stage III patients. In the stage II patients, The LC rate and 5-year DFS rate were comparable for OTT < 50 days and for OTT> 50 days but were much higher in stage III patients with OTT < 50 than OTT> 50 days ( P < 0.001). It was also observed that patients who received BED 2.5 < 105 had lesser rectal ( P < 0.001) and bladder complications than BED 2.5 > 105. Higher rectal complication-free survival (CFS R ) rate, bladder complication-free survival (CFS B ) rate and all-type late complication-free survival rate were observed in patients who received BED 2.5 < 105 than BED 2.5 > 105. A balanced, optimal and justified radiotherapy treatment schedule to deliver higher BED 10 (>84.5) and lower BED 2.5 (< 105) in lesser OTT (< 50 days) is essential in carcinoma cervix to expect a better treatment outcome in all respects.
A generalized Swanson Hamiltonian in a second-derivative pseudo-supersymmetric framework
Bijan Bagchi,Abhijit Banerjee,Partha Mandal
Physics , 2015, DOI: 10.1142/S0217751X15500372
Abstract: We study a generalized scheme of Swanson Hamiltonian from a second-derivative pseudosupersymmetric approach. We discuss plausible choices of the underlying quasi-Hamiltonian and consider the viability of applications to systems like the isotonic oscillator and CPRS potential.
2. Sonourethrography in the evaluation of anterior urethral stricture: correlation with retrograde urethrography in male
Sumanta Kumar Mandal,Sujit Kumar Bhattacharyya,Abhijit Mandal,Debasis Deoghuria
International Journal of Pharmaceutical and Biomedical Research (IJPBR) , 2012,
Abstract: Purpose of this study was to evaluate the efficacy of sonourethrography (SUG) in detection and evaluation of anterior urethral strictures in male compared with retrograde urethrography (RUG). 50 male patients with clinically suspected benign anterior urethral stricture were subjected to RUG followed by SUG performed independently by different observer and subsequently correlated with operative findings. 50 patients with a diagnosis of urethral stricture were evaluated. Short segment, intermediate and long segment urethral stricture were detected were detected by RUG in 13,17,10 patients respectively as compared to 15,18,13 patients by SUG respectively. Sensitivity for detection of short, intermediate and long segment stricture with sonourethrography was 100%, 90.9%; & 88.2% respectively as compared to 88.23%; 83.3%, & 65.2% respectively on retrograde urethrography. Apart from stricture, mucosal, submucosal and periurethral soft tissue abnormalities could be followed up by sonourethrography as compared to retrograde urethrography. Mucosal abnormalities could be detected by SUG in 30% cases as compared to 10% by RUG, submucosal abnormalities were detected in 18% by SUG as opposed to none in RUG & spongiofibrosis was detected in 50% of case by SUG as opposed to none by RUG. SUG could detect diverticulas in 14% as against 8% by RUG and false tract in 6% cases by SUG as against 2% by SUG. Sonourethrography is highly sensitive for and accurate predictor of anterior urathral stricture for the detection of site and length of stricture for planning surgery and should be preferred diagnostic procedure. Retrograde urethrography underestimated the length of stricture in most of the cases. In addition, periurethral soft tissues can be well assessed by sonourethrography.
Millimeterwave Spectral Studies of Propynal (HCCCHO) Produced by DC Glow Discharge and Ab Initio DFT Calculation
A. I. Jaman,Rangana Bhattacharya,Debasish Mandal,Abhijit K. Das
Journal of Atomic, Molecular, and Optical Physics , 2011, DOI: 10.1155/2011/439019
Abstract: The ground-state (=0) millimeterwave rotational spectrum of propynal (HCCCHO) produced by a DC glow discharge through a low-pressure (~10–20 mTorr) flow of propargyl alcohol (HCCCH2OH) vapor has been observed in the frequency region: 36.0–94.0 GHz. Measured rotational transition frequencies along with the previously reported microwave and millimeterwave transitions were fitted to a standard asymmetric-top Hamiltonian to determine an improved set of rotational and centrifugal distortion constant. Detailed DFT calculations were also carried out with various functional and basis sets to evaluate the spectroscopic constants, dipole moment, and various structural parameters of propynal and compared with the corresponding experimental values.
Comparative studies on enhanced oil recovery by alkali–surfactant and polymer flooding
Abhijit Samanta,Achinta Bera,Keka Ojha,Ajay Mandal
Journal of Petroleum Exploration and Production Technologies , 2012, DOI: 10.1007/s13202-012-0021-2
Abstract: Chemical flooding methods are now getting importance in enhanced oil recovery to recover the trapped oil after conventional recovery. In the present study, a comprehensive study has been carried out on alkali, surfactant and polymer flooding. The chemicals with different compositions and combinations were used to recover the oil after conventional water flooding. It has been observed that increase in concentration of alkali, surfactant and polymer increases the additional recovery, but beyond a certain limit, the increase in recovery is only marginal. A series of flooding experiments using the combination of the above methods have been performed with additional recoveries more than 25 %. An analysis has been made on the relative cost of the different chemical slugs injected and the corresponding additional oil recovery. Based on the analysis, an optimum composition of the alkali–surfactant–polymer system has been recommended.
Surfactant and Surfactant-Polymer Flooding for Enhanced Oil Recovery
Abhijit Samanta,Keka Ojha,Ashis Sarkar,Ajay Mandal
Advances in Petroleum Exploration and Development , 2011, DOI: 10.3968/10.3968/ j.aped.1925543820110201.608
Abstract: Investigation has been made to characterize the surfactant solution in terms of its ability to reduce the surface tension and the interaction between surfactant and polymer in its aqueous solution. A series of flooding experiments have been carried out to find the additional recovery using surfactant and surfactant polymer slug. Approximately 0.5 pore volume (PV) surfactant (Sodium dodecylsulfate) slug was injected in surfactant flooding, while 0.3 PV surfactant slug and 0.2 PV polymer (partially hydrolyzed polyacrylamide) slug were injected for surfactant-polymer flooding. In each case chase water was used to maintain the pressure gradient. The additional recovery in surfactant and polymer augmented surfactant flooding were found around 20% and 23% respectively.Key words: Enhanced oil recovery; Surfactant; Polymer; Surface tension; Flooding
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