R. Samanta - Academia.edu (original) (raw)

Papers by R. Samanta

Research paper thumbnail of Crystal structure of a dinucleotide-binding protein (Y224A/Y246A) of ABC transporter endogenously bound to uridylyl-3'-5'-phospho-guanosine (Form I)

Research paper thumbnail of Crystal structure of a dinucleotide-binding protein (T240A) of ABC transporter endogenously bound to uridylyl-3'-5'-phospho-guanosine

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in a closed state bound to cellopentaose

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in a closed state bound to cellotriose (Form II)

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein of ABC transporter in a closed state bound to cellobiose

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein of ABC transporter in an open state (Form II)

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in an open state

Research paper thumbnail of Electron capture cross section in collision of multi-charged neon ions with ground state hydrogen and helium

Indian Journal of Physics, 2012

The classical trajectory Monte Carlo method and the post form of three-body boundary corrected co... more The classical trajectory Monte Carlo method and the post form of three-body boundary corrected continuum intermediate state (BCCIS-3B) approximation are employed to calculate the cross sections for total and state-selective electron capture in collision of highly charged Ne q? ions with ground state hydrogen atom in the intermediate to high energy region. In both these methods, the active electron interactions with the partially stripped neon ions are described by a model potential containing both a long-range part and a short-range part. We have also calculated the double electroncapture cross sections in collision of fully stripped neon ion with helium atom in the energy range 80-2,000 keV/amu using the post-form of four-body BCCIS approximation (BCCIS-4B). In BCCIS formalism, the intermediate continuum state of the active electrons with the projectile ion has been taken into account as the projectile charge is greater than the target charge. In addition, state-selective charge transfer cross sections are given in tabular and graphical form.

Research paper thumbnail of Elastic Timing Scheme for Energy-Efficient and Robust Performance

9th International Symposium on Quality Electronic Design (isqed 2008), 2008

In nanometer regime, IC designers are struggling between significant variation effects and tight ... more In nanometer regime, IC designers are struggling between significant variation effects and tight power constraints. The conventional approach-using timing safety margin, consumes power continuously to guard against low probability timing variations. Such power inefficiency is largely eliminated in the Razor technology which detects and corrects variation induced timing errors at runtime. However, the error correction scheme of Razor causes pipeline stalling/flushing and therefore is not preferred in real-time systems or sequential circuits with feedback loops. We propose an elastic timing scheme which can correct timing errors without stalling/flushing pipeline. This is achieved by dynamically boosting circuit speed when timing error occurs. A dynamic clock skew shifting technique is suggested to reduce the boosting cost. An optimization algorithm is also provided to minimize the cost overhead. Compared to conventional safety margin based approach, the elastic timing scheme can reduce power dissipation by 20% − 27% on ISCAS89 sequential circuits while retaining similar variation tolerance. After optimization, the boosting is needed for only a small portion of entire circuit. As a result, the area overhead is usually less than 5%. 2 Background on Razor Our idea of elastic timing scheme is inspired by Razor [7], which is a power-efficient technique for variation tolerance. The 9th International Symposium on Quality Electronic Design

Research paper thumbnail of State-selective charge transfer in ion–ion interactions at intermediate and high energies

Physica Scripta, 2010

ABSTRACT The total and state-selective cross sections for charge transfer in H++He+, He2++Li2+, H... more ABSTRACT The total and state-selective cross sections for charge transfer in H++He+, He2++Li2+, He2++He+ and Li3++Li2+ collisions were calculated using the boundary corrected continuum intermediate state approximation with an energy range of 30–2000 keV amu−1. In this model, distortion in the final channel related to the Coulomb continuum states of the projectile ion and the electron in the field of the residual target is included. The sub-shell distribution of total charge transfer cross section has been reported in tabular form. Comparison of the results is made with those of other recent theoretical investigations and experimental findings. The present results are found to be in very good agreement with the available experimental findings.

Research paper thumbnail of Clock Buffer Polarity Assignment for Power Noise Reduction

IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2009

Research paper thumbnail of Lower Incidence of Stent Thrombosis and Mace with Prasugrel in Stemi Patients <76 Years of Age

Heart, Lung and Circulation, 2013

Research paper thumbnail of Clinical Outcome of Drug-Eluting Stents Versus Bare-Metal Stents in Patients Undergoing Percutaneous Intervention in Vein Grafts

Heart, Lung and Circulation, 2013

length as compared to patients with less than 5% struts malapposed (11 ± 9.07 mm and 4.33 ± 6.07 ... more length as compared to patients with less than 5% struts malapposed (11 ± 9.07 mm and 4.33 ± 6.07 mm, respectively-p = 0.011). Calcific plaque thickness of >65 m also corresponded to greater than 5% malapposition in stent struts (p = 0.01). Conclusion: Calcific plaque length and thickness appears to predict stent strut malapposition in our small study.

Research paper thumbnail of Lower MACE Rates with Integrity™ Stents Compared to Contemporary Bare Metal Stents in High Risk PCI Cohort

Heart, Lung and Circulation, 2012

Background: There is limited long-term randomised control trial or registry data available on the... more Background: There is limited long-term randomised control trial or registry data available on the safety and effectiveness of Everolimus eluting stents (EES) in patients with ST elevation myocardial infarction (STEMI). We present registry data from a tertiary referral centre in New Zealand. Methods: This is a retrospective analysis of patients presenting acutely with STEMI treated by primary or rescue angioplasty between 1 April 2007 and 31 October 2010. The primary endpoint was major adverse cardiovascular event (MACE), which included all cause death, MI and target vessel revascularisation (TVR). We compared outcomes in patients who received EES (Xience) to the infarct lesion with those who received bare metal stents. Results: Of 506 consecutive patients, 468 underwent primary angioplasty and 38 underwent rescue angioplasty; 369 (73%) were males and mean age was 62 ± 12.3yrs. At least one EES was implanted in the infarct lesion in 360 and one BMS in 146 patients. Mean number of stents per patient was 1.8. As at 31 October 2011, MACE was 18.3% after EES compared with 19.8% after BMS (p = 0.56), death and MI was 15.2% vs. 17.8% (p = 0.78) and all cause death was 7.7% vs. 9.5% (p = 0.87), respectively. Target lesion revascularisation (TLR) was 2.8% for EES and 6.8% for BMS (p = 0.33). Conclusion: There was no significant difference between long-term outcomes after EES compared with BMS.

Research paper thumbnail of Electron capture by fast protons from helium-like ions

The European Physical Journal D, 2011

Four-body formalism of boundary corrected continuum intermediate state (BCCIS-4B) approximation h... more Four-body formalism of boundary corrected continuum intermediate state (BCCIS-4B) approximation have been applied to calculate the single-electron capture cross sections by fast protons through some helium-like ions in a large energy range from 30-1000 keV. In this model, distortion has been taken into account in the entrance channel. In the final channel, the passive electron plays the role of screening of the target ion. However, continuum states of the projectile and the electron in the field of the residual target ion are included. The comparison of the results is made with those of other theoretical investigations and experimental findings. The present calculated results are found to be in good agreement with the available experimental findings.

Research paper thumbnail of Crystal structure of a dinucleotide-binding protein (Y224A/Y246A) of ABC transporter endogenously bound to uridylyl-3'-5'-phospho-guanosine (Form I)

Research paper thumbnail of Crystal structure of a dinucleotide-binding protein (T240A) of ABC transporter endogenously bound to uridylyl-3'-5'-phospho-guanosine

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in a closed state bound to cellopentaose

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in a closed state bound to cellotriose (Form II)

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein of ABC transporter in a closed state bound to cellobiose

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein of ABC transporter in an open state (Form II)

Research paper thumbnail of Crystal structure of beta-glycosides-binding protein (W177X) of ABC transporter in an open state

Research paper thumbnail of Electron capture cross section in collision of multi-charged neon ions with ground state hydrogen and helium

Indian Journal of Physics, 2012

The classical trajectory Monte Carlo method and the post form of three-body boundary corrected co... more The classical trajectory Monte Carlo method and the post form of three-body boundary corrected continuum intermediate state (BCCIS-3B) approximation are employed to calculate the cross sections for total and state-selective electron capture in collision of highly charged Ne q? ions with ground state hydrogen atom in the intermediate to high energy region. In both these methods, the active electron interactions with the partially stripped neon ions are described by a model potential containing both a long-range part and a short-range part. We have also calculated the double electroncapture cross sections in collision of fully stripped neon ion with helium atom in the energy range 80-2,000 keV/amu using the post-form of four-body BCCIS approximation (BCCIS-4B). In BCCIS formalism, the intermediate continuum state of the active electrons with the projectile ion has been taken into account as the projectile charge is greater than the target charge. In addition, state-selective charge transfer cross sections are given in tabular and graphical form.

Research paper thumbnail of Elastic Timing Scheme for Energy-Efficient and Robust Performance

9th International Symposium on Quality Electronic Design (isqed 2008), 2008

In nanometer regime, IC designers are struggling between significant variation effects and tight ... more In nanometer regime, IC designers are struggling between significant variation effects and tight power constraints. The conventional approach-using timing safety margin, consumes power continuously to guard against low probability timing variations. Such power inefficiency is largely eliminated in the Razor technology which detects and corrects variation induced timing errors at runtime. However, the error correction scheme of Razor causes pipeline stalling/flushing and therefore is not preferred in real-time systems or sequential circuits with feedback loops. We propose an elastic timing scheme which can correct timing errors without stalling/flushing pipeline. This is achieved by dynamically boosting circuit speed when timing error occurs. A dynamic clock skew shifting technique is suggested to reduce the boosting cost. An optimization algorithm is also provided to minimize the cost overhead. Compared to conventional safety margin based approach, the elastic timing scheme can reduce power dissipation by 20% − 27% on ISCAS89 sequential circuits while retaining similar variation tolerance. After optimization, the boosting is needed for only a small portion of entire circuit. As a result, the area overhead is usually less than 5%. 2 Background on Razor Our idea of elastic timing scheme is inspired by Razor [7], which is a power-efficient technique for variation tolerance. The 9th International Symposium on Quality Electronic Design

Research paper thumbnail of State-selective charge transfer in ion–ion interactions at intermediate and high energies

Physica Scripta, 2010

ABSTRACT The total and state-selective cross sections for charge transfer in H++He+, He2++Li2+, H... more ABSTRACT The total and state-selective cross sections for charge transfer in H++He+, He2++Li2+, He2++He+ and Li3++Li2+ collisions were calculated using the boundary corrected continuum intermediate state approximation with an energy range of 30–2000 keV amu−1. In this model, distortion in the final channel related to the Coulomb continuum states of the projectile ion and the electron in the field of the residual target is included. The sub-shell distribution of total charge transfer cross section has been reported in tabular form. Comparison of the results is made with those of other recent theoretical investigations and experimental findings. The present results are found to be in very good agreement with the available experimental findings.

Research paper thumbnail of Clock Buffer Polarity Assignment for Power Noise Reduction

IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 2009

Research paper thumbnail of Lower Incidence of Stent Thrombosis and Mace with Prasugrel in Stemi Patients <76 Years of Age

Heart, Lung and Circulation, 2013

Research paper thumbnail of Clinical Outcome of Drug-Eluting Stents Versus Bare-Metal Stents in Patients Undergoing Percutaneous Intervention in Vein Grafts

Heart, Lung and Circulation, 2013

length as compared to patients with less than 5% struts malapposed (11 ± 9.07 mm and 4.33 ± 6.07 ... more length as compared to patients with less than 5% struts malapposed (11 ± 9.07 mm and 4.33 ± 6.07 mm, respectively-p = 0.011). Calcific plaque thickness of >65 m also corresponded to greater than 5% malapposition in stent struts (p = 0.01). Conclusion: Calcific plaque length and thickness appears to predict stent strut malapposition in our small study.

Research paper thumbnail of Lower MACE Rates with Integrity™ Stents Compared to Contemporary Bare Metal Stents in High Risk PCI Cohort

Heart, Lung and Circulation, 2012

Background: There is limited long-term randomised control trial or registry data available on the... more Background: There is limited long-term randomised control trial or registry data available on the safety and effectiveness of Everolimus eluting stents (EES) in patients with ST elevation myocardial infarction (STEMI). We present registry data from a tertiary referral centre in New Zealand. Methods: This is a retrospective analysis of patients presenting acutely with STEMI treated by primary or rescue angioplasty between 1 April 2007 and 31 October 2010. The primary endpoint was major adverse cardiovascular event (MACE), which included all cause death, MI and target vessel revascularisation (TVR). We compared outcomes in patients who received EES (Xience) to the infarct lesion with those who received bare metal stents. Results: Of 506 consecutive patients, 468 underwent primary angioplasty and 38 underwent rescue angioplasty; 369 (73%) were males and mean age was 62 ± 12.3yrs. At least one EES was implanted in the infarct lesion in 360 and one BMS in 146 patients. Mean number of stents per patient was 1.8. As at 31 October 2011, MACE was 18.3% after EES compared with 19.8% after BMS (p = 0.56), death and MI was 15.2% vs. 17.8% (p = 0.78) and all cause death was 7.7% vs. 9.5% (p = 0.87), respectively. Target lesion revascularisation (TLR) was 2.8% for EES and 6.8% for BMS (p = 0.33). Conclusion: There was no significant difference between long-term outcomes after EES compared with BMS.

Research paper thumbnail of Electron capture by fast protons from helium-like ions

The European Physical Journal D, 2011

Four-body formalism of boundary corrected continuum intermediate state (BCCIS-4B) approximation h... more Four-body formalism of boundary corrected continuum intermediate state (BCCIS-4B) approximation have been applied to calculate the single-electron capture cross sections by fast protons through some helium-like ions in a large energy range from 30-1000 keV. In this model, distortion has been taken into account in the entrance channel. In the final channel, the passive electron plays the role of screening of the target ion. However, continuum states of the projectile and the electron in the field of the residual target ion are included. The comparison of the results is made with those of other theoretical investigations and experimental findings. The present calculated results are found to be in good agreement with the available experimental findings.