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Shallow Depth SIFT Based Approach for Mapping underwater surfaces using AUV’s
RAGHURAM C S,Sai Anoop Sadineni 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Autonomous Underwater Vehicles(AUVs) have always been used in oceanic exploration. They were used for topographic mapping, studying the various elements of the sea from flora and fauna to synthetic objects and debris alike. This paper aims to produce perceivable maps of the shallow seabed using AUVs, using the Scale-Invariant Feature Transform(SIFT) algorithm for collecting features from the images and using the Brute-force matcher to match the images producing 2-dimensional rectangular maps by applying the proposed algorithm. The algorithm was tested using handheld webcams in a simulated environment and our results were consistent with the expected output, and also account for the uncertainty of noise, distortion due to the reflection of light on the surface of the water at shallow depths. This approach to mapping has a low computational cost and can be deployed to multiple AUVs to map larger areas.
Mehdi Karevan,Raghuram V. Pucha,Md.A. Bhuiyan,Kyriaki Kalaitzidou 한국탄소학회 2010 Carbon Letters Vol.11 No.4
This study investigates the effect of filler content (wt%), presence of interphase and agglomerates on the effective Young's modulus of polypropylene (PP) based nanocomposites reinforced with exfoliated graphite nanoplatelets (xGnPTM) and carbon nanotubes (CNTs). The Young's modulus of the composites is determined using tensile testing based on ASTM D638. The reinforcement/polymer interphase is characterized in terms of width and mechanical properties using atomic force microscopy which is also used to investigate the presence and size of agglomerates. It is found that the interphase has an average width of ~30 nm and modulus in the range of 5 to 12 GPa. The Halpin-Tsai micromechanical model is modified to account for the effect of interphase and filler agglomerates and the model predictions for the effective modulus of the composites are compared to the experimental data. The presented results highlight the need of considering various experimentally observed filler characteristics such as agglomerate size and aspect ratio and presence and properties of interphase in the micromechanical models in order to develop better design tools to fabricate multifunctional polymer nanocomposites with engineered properties.
Menon, Uthara,Poongodi, V,Raghuram, Pitty Hari,Ashokan, Kannan,Govindarajan, Giri Valanthan Veda,Ramanathan, Arvind Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.11
Background: Missense and frame-shift mutations within the dimer forming domain of the caspase 8 gene have been identified in several cancers. However, the genetic status of this region in precancerous lesions, like oral submucous fibrosis (OSMF), and well differentiated oral squamous cell carcinomas (OSCCs) in patients from southern region of India is not known, and hence the present study was designed to address this issue. Materials and Methods: Genomic DNA isolated from biopsy tissues of thirty one oral submucous fibrosis and twenty five OSCC samples were subjected to PCR amplification with intronic primers flanking exon 7 of the caspase 8 gene. The PCR amplicons were subsequently subjected to direct sequencing to elucidate the status of mutation. Results: Sequence analysis identified a frame-shift and a novel missense mutation in two out of twenty five OSCC samples. The frame-shift mutation was due to a two base pair deletion (c.1225_1226delTG), while the missense mutation was due to substitution of wild type cysteine residue with phenylalanine at codon 426 (C426F). The missense mutation, however, was found to be heterozygous as the wild type C426C codon was also present. None of the OSMF samples carried mutations. Conclusions: The identification of mutations in OSCC lesions but not OSMF suggests that dimer forming domain mutations in caspase 8 may be limited to malignant lesions. The absence of mutations in OSMF also suggests that the samples analyzed in the present study may not have acquired transforming potential. To the best of our knowledge this is the first study to have explored and identified frame-shift and novel missense mutations in OSCC tissue samples.
HariKrishna Devalapally,Raghavendra Swamy Navath,Venkateshwarlu Yenamandra,RaghuRam Rao Akkinepally,Rama Krishna Devarakonda 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.6
Anthracycline antibiotics, particularly doxorubicin and daunorubicin, have been used extensively in the treatment of human malignancies. However cardiotoxicity and multidrug resistance are significant problems that limit the clinical efficacy of such agents. Rational design to avoid these side effects includes strategies such as drug targeting and prodrug synthesis. Described here are the synthesis and preliminary biological evaluation of the enzymatically activated two new prodrugs (6 & 11) of doxorubicin. These prodrugs were designed as potential candidates for selective chemotherapy in ADEPT or PMT strategies. They are constituted of a galactose moiety, a spacer and the cytotoxic drug and they differ by the type of spacer. The prodrugs were stable in a buffer, and the in vitro studies showed good detoxification and hydrolysis kinetics. As prodrug 11 was readily hydrolyzed, this could be a valuable candidate for further development.
Performance of non-prismatic simply supported prestressed concrete beams
P. Markandeya Raju,K. Rajsekhar,T. Raghuram Sandeep 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
Prestressing is the most commonly employed technique in bridges and long span beams incommercial buildings as prestressing results in slender section with higher load carrying capacities. Thiswork is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any requiredsection. Based on these equations an algorithm is developed which does the stress checks for the givensection for every 500 mm interval of the span. Limit state method is used for the design of beam and finitedifference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.
Performance of non-prismatic simply supported prestressed concrete beams
Raju, P. Markandeya,Rajsekhar, K.,Sandeep, T. Raghuram Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
Prestressing is the most commonly employed technique in bridges and long span beams in commercial buildings as prestressing results in slender section with higher load carrying capacities. This work is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any required section. Based on these equations an algorithm is developed which does the stress checks for the given section for every 500 mm interval of the span. Limit state method is used for the design of beam and finite difference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.
Devalapally, Harikrishna,Navath, Raghavendra Swamy,Yenamandra, Venkateshwarlu,Akkinepally, RaghuRam Rao,Devarakonda, Rama Krishna 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.6
Anthracycline antibiotics, particularly doxorubicin and daunorubicin, have been used extensively in the treatment of human malignancies. However cardiotoxicity and multidrug resistance are significant problems that limit the clinical efficacy of such agents. Rational design to avoid these side effects includes strategies such as drug targeting and prodrug synthesis. Described here are the synthesis and preliminary biological evaluation of the enzymatically activated two new prodrugs (6 & 11) of doxorubicin. These prodrugs were designed as potential candidates for selective chemotherapy in ADEPT or PMT strategies. They are constituted of a galactose moiety, a spacer and the cytotoxic drug and they differ by the type of spacer. The prodrugs were stable in a buffer, and the in vitro studies showed good detoxification and hydrolysis kinetics. As prodrug 11 was readily hydrolyzed, this could be a valuable candidate for further development.