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Domain Mapping using Nonlinear Finite Element Formulation
Patro, Tangudu Srinivas,Voruganti, Hari K.,Dasgupta, Bhaskar,Basu, Sumit Society for Computational Design and Engineering 2008 International Journal of CAD/CAM Vol.8 No.1
Domain mapping is a bijective transformation of one domain to another, usually from a complicated general domain to a chosen convex domain. This is directly useful in many application problems like shape modeling, morphing, texture mapping, shape matching, remeshing, path planning etc. A new approach considering the domain as made up of structural elements, like membranes or trusses, is developed and implemented using the nonlinear finite element formulation. The mapping is performed in two stages, boundary mapping and inside mapping. The boundary of the 3-D domain is mapped to the surface of a convex domain (in this case, a sphere) in the first stage and then the displacement/distortion of this boundary is used as boundary conditions for mapping the interior of the domain in the second stage. This is a general method and it develops a bijective mapping in all cases with judicious choice of material properties and finite element analysis. The consistent global parameterization produced by this method for an arbitrary genus zero closed surface is useful in shape modeling. Results are convincing to accept this finite element structural approach for domain mapping as a good method for many purposes.
Proton therapy for reducing heart and cardiac substructure doses in Indian breast cancer patients
Sapna Nangia(Sapna Nangia ),Nagarjuna Burela(Nagarjuna Burela ),M. P. Noufal(M. P. Noufal ),Kartikeswar Patro(Kartikeswar Patro ),Manoj Gulabrao Wakde(Manoj Gulabrao Wakde ),Dayanada S. Sharma(Dayanad 대한방사선종양학회 2023 Radiation Oncology Journal Vol.41 No.2
Purpose: Indians have a higher incidence of cardiovascular diseases, often at a younger age, than other ethnic groups. This higher baseline risk requires consideration when assessing additional cardiac morbidity of breast cancer treatment. Superior cardiac sparing is a critical dosimetric advantage of proton therapy in breast cancer radiotherapy. We report here the heart and cardiac-substructure doses and early toxicities in breast cancer patients treated post-operatively with proton therapy in India’s first proton therapy center. Materials and Methods: We treated twenty breast cancer patients with intensity-modulated proton therapy (IMPT) from October 2019 to September 2022, eleven after breast conservation, nine following mastectomy, and appropriate systemic therapy, when indicated. The most prescribed dose was 40 GyE to the whole breast/chest wall and 48 GyE by simultaneous integrated boost to the tumor bed and 37.5 GyE to appropriate nodal volumes, delivered in 15 fractions. Results: Adequate coverage was achieved for clinical target volume (breast/chest wall), i.e., CTV40, and regional nodes, with 99% of the targets receiving 95% of the prescribed dose (V95% > 99%). The mean heart dose was 0.78 GyE and 0.87 GyE for all and left breast cancer patients, respectively. The mean left anterior descending artery (LAD) dose, LAD D0.02cc, and left ventricle dose were 2.76, 6.46, and 0.2 GyE, respectively. Mean ipsilateral lung dose, V20Gy, V5Gy, and contralateral breast dose (Dmean) were 6.87 GyE, 14.6%, 36.4%, and 0.38 GyE, respectively. Conclusion: The dose to heart and cardiac substructures is lower with IMPT than published photon therapy data. Despite the limited access to proton therapy at present, given the higher cardiovascular risk and coronary artery disease prevalence in India, the cardiac sparing achieved using this technique merits consideration for wider adoption in breast cancer treatment.
Elliptic Curve Signcryption Based Security Protocol for RFID
( Anuj Kumar Singh ),( B. D. K. Patro ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1
Providing security has been always on priority in all areas of computing and communication, and for the systems that are low on computing power, implementing appropriate and efficient security mechanism has been a continuous challenge for the researchers. Radio Frequency Identification (RFID) system is such an environment, which requires the design and implementation of efficient security mechanism. Earlier, the security protocols for RFID based on hash functions and symmetric key cryptography have been proposed. But, due to high strength and requirement of less key size in elliptic curve cryptography, the focus of researchers has been on designing efficient security protocol for RFID based on elliptic curves. In this paper, an efficient elliptic curve signcryption based security protocol for RFID has been proposed, which provides mutual authentication, confidentiality, non-repudiation, integrity, availability, forward security, anonymity, and scalability. Moreover, the proposed protocol successfully provides resistance from replay attack, impersonation attack, location tracking attack, de-synchronization attack, denial of service attack, man-in-the-middle attack, cloning attack, and key-compromise attack. Results have revealed that the proposed protocol is efficient than the other related protocols as it takes less computational time and storage cost, especially for the tag, making it ideal to be used for RFID systems.
Structural Behaviour of Reinforced Concrete Beams Made with Ferrochrome Slag as Coarse Aggregate
Jnyanendra Kumar Prusty,Sanjaya Kumar Patro,Tribikram Mohanty 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2
Nowadays, industrial wastes are utilized in concrete to reduce the demand of natural resources as well as for environmental safety. This research deals with the structural behaviour of reinforced concrete beams made with ferrochrome slag as coarse aggregate. In two different phases, total eighteen number of beams were tested. In first phase, the ultimate failure load of conventional reinforced concrete beams (CRCB) and ferrochrome slag based reinforced concrete beams (FRCB) were compared. After noticing the higher load carrying capacity of FRCB than that of CRCB, in second phase only FRCBs were considered to observe the effect of span length and tension reinforcement ratio on its structural properties. The ultimate flexural strength, shear strength, short-term deflection, and crack widths were observed and compared with the predicted values obtained from IS 456 and EUROCODE 2. It has been observed that both Indian and European standards were well predicted the flexural capacity of FRCB. However, they were more conservative to predict the shear capacity of FRCB. The short-term deflection and crack width under service load has satisfied well, the requirement of the design code
Mallappa J. Madolli,Sushil K. Himanshu,Epari Ritesh Patro,Carlo De Michele 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.4
This paper presents a detailed review and discussion on the long-range forecast (LRF) of Indian summer monsoon rainfall(ISMR), its present status, problems, and perspectives with an emphasis on the Indian meteorological department (IMD)operational forecasting methods and its forecasts. Verifications of IMD LRF for 1924-1987 revealed a success rate of nearly64%. IMD operational LRF skills (correlation coefficient) during the period 1988-2020 were found as 0.25 and 0.34 for the1st -stage (April) and 2nd -stage (June), respectively. From 1988 to 2020 (33-years), 21-years of predictions were predictedout of the confidence band (±4%LRF). Out of these 21-years, 18-years were individual or co-occurring El Niño-SouthernOscillation (ENSO) and Indian Ocean Dipole (IOD) event years. It indicates that IMD operational models have failed tocapture ENSO and IOD phenomenon effects in their predictions considerably, despite the developing stage of ENSO andIOD events during the monsoon season. Moderate success and limitations of statistical models of IMD lead to the launchingof the Monsoon mission (MM) in 2012 to use the dynamical prediction system by using the climate forecast system. Withina span of 7-years, MM has brought the skill of ISMR prediction to 0.71, which is above the older potentially predictablelimit estimate of 0.65. Overall, in the last century, enormous progress has been made on the LRF of the ISMR. The accuratecapturing of the ENSO and IOD phenomenon, incorporation of non-stationarity components in the predictors, improvementsin the model microphysics and initial conditions could improve prediction skills.
Hedge Fund Ownership and Voluntary Disclosure
Bok Baik,Jin-Mo Kim,Kyonghee Kim,Sukesh Patro 한국재무학회 2014 한국재무학회 학술대회 Vol.2014 No.05
Using 13F filings from 1996 to 2011, we examine the association between hedge fund ownership and a firm’s voluntary disclosure. We find that hedge fund holdings are negatively associated with the subsequent frequency of voluntary disclosure. This is opposite to the positive association documented in earlier studies for overall institutional ownership as well as for non-hedge fund ownership in our sample. The negative association is more pronounced in firms held mainly by hedge funds with short-term investment horizons. We also find that the stocks that decrease their voluntary disclosure subsequent to increases in hedge fund holdings earn positive abnormal returns. Overall, our findings suggest that hedge fund influence on firm voluntary disclosure policy differs from that of other institutional investors and potentially contributes to hedge fund profitability.