Concurrent Scheduling of Machines and Tools without Tool Delay in a Multi Machine FMS using Flower Pollination Algorithm

Padma Lalitha Mareddy,Sivarami Reddy Narapureddy,Venkata Ramamurthy Dwivedula,Sunil V Prayagi 대한산업공학회 2023 Industrial Engineeering & Management Systems Vol.22 No.3

This paper deals with machines and tools joint scheduling in a multi-machine flexible manufacturing system to min-imize makespan with the lowest possible copies of every type of tool without tool delay. The tools are placed in a central tool magazine that shares with and serves several machines. The problem is determining the lowest possible copies of every type of tool, allocation of tool copies to job-operations, and job-operations’ sequencing on machines without tool delay for makespan minimization. This paper proposes a nonlinear mixed integer programming formula-tion to model this simultaneous scheduling problem and flower pollination algorithm based on the flowers’ pollination process for solving this problem. The results have been tabulated, analyzed, and compared.

Production of Glutaminase (E.C. 3.2.1.5) from Zygosaccharomyces rouxii in Solid-State Fermentation and Modeling the Growth of Z. rouxii Therein

( Padma Iyer ),( Rekha S. Singhal ) 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.4

Effect of annealing temperature on the electrical and structural properties of V/p-GaN Schottky structures

Padma, R.,Nagaraju, G.,Rajagopal Reddy, V.,Choi, Chel-Jong Elsevier 2016 THIN SOLID FILMS - Vol.598 No.-

<P><B>Abstract</B></P> <P>The electrical and structural properties of V/p-GaN Schottky barrier diode (SBD) have been investigated as a function of annealing temperature. The Schottky barrier height (SBH) of the as-deposited contact is found to be 0.82eV (<I>I–V</I>) and 1.10eV (<I>C–V</I>). However, it is noted that the SBH increases for the contact annealed at 400°C and the values are 0.94eV (<I>I–V</I>) and 1.21eV (<I>C–V</I>). Further, with increasing annealing temperature up to 500°C, the SBH decreases to 0.92eV (<I>I–V</I>) and 1.19eV (<I>C–V</I>). Also, the rectification ratio of the V/p-GaN SBD is evaluated for as-deposited and annealed contacts. The electrical parameters of the V/p-GaN SBD are also discussed with Cheung's and Norde functions. It is noted that the interface state density decreases upon annealing at 400°C and then slightly increases after annealing at 500°C. Results reveal that the superior electrical characteristics are obtained for the contact annealed at 400°C. The electrical results are also correlated with the interfacial microstructure of the contacts. The AES and XRD results reveal that the formation of nitride phases at the interface may be the reason for the increase of SBH after annealing at 400°C. The formation of gallide phases at the interface may be reason for the decrease in the SBH.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Annealing effects on electrical and structural properties of V/p-GaN SBD are studied. </LI> <LI> Maximum barrier height is obtained on V/p-GaN SBD upon annealing at 400°C. </LI> <LI> Interface state density decreases with increasing annealing temperature up to 400°C. </LI> <LI> Electrical results are correlated with the interfacial microstructure of the contacts. </LI> <LI> Nitride interfacial phases are responsible for increase in BH after annealing at 400°C. </LI> </UL> </P>

Multimodality Medical Image Fusion Based on New Features in NSST Domain

Padma Ganasala,Vinod Kumar Gupta 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.4

Purpose Multimodality medical image fusion supports bettervisualization of complimentary information given by differentmedical imaging modalities. This helps the radiologist forthe precise diagnosis of disease and treatment planning. Main purpose of this research is to design a unified framework for fusion of different anatomical imaging modalitiesand fusion of functional image with an anatomical image. Methods A novel image fusion framework utilizing newfeatures in Nonsubsampled Shearlet Transform (NSST) domainis proposed for fusion of anatomical images. The source imagesare represented in low-frequency (LF) and high-frequency(HF) sub-bands using NSST. LF sub-bands are combined byfusion rule based on sum of variation in squares. HF fusionrule is formulated based on two different features. InverseNSST of fused sub-bands gives the fused image. Further, thisframework is utilized for fusion of functional and anatomicalimages in l-Alpha-Beta color space. Results The proposed image fusion framework is validatedon nine sets of CT-MRI, and SPECT-MRI images of differentdiseases. It is compared with state of the art image fusionmethods both quantitatively and qualitatively. Conclusions Visual analysis of CT-MRI image fusion resultsreveal that the fused images by proposed method retain thesalient information of both CT and MRI images with morecontrast than other methods. Fused SPECT-MRI images byproposed method presents anatomical details of MRI imageswithout altering the functional content of SPECT images. However, spectral distortion is present in other methods. Quantitative comparison proved the superiority proposedmethod compared to other methods.

Dual Time Point 18F-FDG PET/CT Imaging Identifies Bilateral Renal Tuberculosis in an Immunocompromised Patient with an Unknown Primary Malignancy

Padma Subramanyam,Shanmuga Sundaram Palaniswamy 대한감염학회 2015 Infection and Chemotherapy Vol.47 No.2

18F-FDG PET/CT imaging is an established imaging modality for cancer staging and response assessment. Its role in identifying infective and inflammatory pathologies from malignancy is debated. Dual time- point imaging is a refined technique used to overcome this interpretational dilemma. We present a 59 year old male with an unknown primary malignancy who was referred for a 18F-FDG PET/CT imaging. Images revealed primary lung malignancy with co existing bilateral renal tuberculosis which otherwise would have gone amiss or would have been considered as metastases.

Nucleotide Sequencing and PCR-RFLP of Insulin-like Growth Factor Binding Protein-3 Gene in Riverine Buffalo (Bubalus bubalis)

Padma, B.,Kumar, Pushpendra,Choudhary, V.,Dhara, S.K.,Mishra, A.,Bhattacharya, T.K.,Bhushan, B.,Sharma, Arjava Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.7

Insulin-like growth factor binding protein-3 (IGFBP-3) gene is a structural gene associated with the growth and development of the animals. The present investigation was carried out to unravel nucleotide sequence and polymerase chain reactionrestriction fragment polymorphism (PCR-RFLP) of IGFBP-3 gene in buffalo. Genomic DNA was isolated from a total of 157 animals belonging to Murrah, Surti, Jaffarabadi and Nagpuri breeds of Indian riverine buffalo. A 655 bp of IGFBP-3 gene was amplified in all the breeds and amplicons were digested with Hae III, Taq I and Msp I restriction enzymes. On digestion with Hae III yielded single restriction pattern of 8 fragments of sizes 201, 165, 154, 56, 36, 19, 16 and 8 bp in all the animals studied. Similarly Taq I and Msp I also revealed single restriction pattern yielding fragments of sizes 240 and 415 bp and 145 and 510 bp, respectively. This shows nonpolymorphic nature of restriction sites in buffalo. Nucleotide sequencing of 587 bp of IGFBP-3 gene in Murrah buffalo was done and submitted to the GenBank (Accession No. AY304829). Nucleotide sequencing revealed an addition of 4 bases in the intronic region as compared to cattle.

A Survey on Study of Various Machine Learning Methods for Classification

S. Padma,R. Pugazendi 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.5

This article comprises a review of various sequential algorithms. The review represents the working nature of the learning methods. It also includes the methods such as Minimal Resource Allocation Network (MRAN), Extreme Learning Machine (ELM), Self-regulated Resource Allocation Network (SRAN) and Meta-Cognitive Neural Network (MCNN) for real –valued neural network. Projection Based Learning with Meta-Cognitive Radial Basis Function Network (PBL-McRBFN) for complex valued neural network. Finally about Meta-Cognitive Fuzzy Inference System (MCFIS) using the Neuro - Fuzzy inference system for learning. The previously said SRAN works on the basis of self – regulatory mechanism in order to reduce the huge loss error and to maximize the class – wise significance. The methods such as MCNN, PBL-McRBFN and MCFIS execute on the human learning strategies such as what – to-learn, when –to-learn and how –to – learn. This review helps to select the learning methods suitable for the data that is to be classified.

PERFORMANCE COMPARISON OF p – n JUNCTION DIODES USING ZINC OXIDE AND COPPER PHTHALOCYANINE HYBRID NANOCOMPOSITES AND BILAYER HETEROSTRUCTURES

N. PADMA,MANORANJAN GHOSH,SHASHWATI SEN,R. TEWARI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6

Nanocomposites of n-type Zinc Oxide (ZnO) and p-type copper phthalocyanine (CuPc) weresynthesized using solution route and the electrical properties of heterojunctions of ZnO and CuPcin the nanocomposite ¯lm was studied. For comparison, electrical properties of bilayer hetero-junction devices using ZnO nanostructure drop cast ¯lm and thermally evaporated CuPc werealso studied. Recti¯cation ratio (RR) of about 28 and 5.5 was obtained at 4 V for devices withnanocomposite ¯lm and bilayer heterojunctions indicating improved formation of p – n junctioncharacteristics for nanocomposite ¯lms. Values of ideality factor, barrier height at the p – njunction interface and series resistance were estimated using di®erent methods like semilog plots,Cheung and Norde's methods. Ideality factor estimated from semilog plots and Cheung'smethods were found to be higher than unity indicating deviation from ideal diode behavior. Barrier height estimated from di®erent methods was about 0.7 eV. Series resistance measuredusing Cheung and Norde's methods were found to be about 92 K ? and 21 K ? , respectively. Bilayer heterojunction devices exhibited much higher series resistance, ideality factor and barrierheight as estimated using all the above-mentioned methods as compared to the devices withnanocomposite ¯lm. The above results indicate intimate mixing and improved interface betweenZnO and CuPc in the in situ synthesized nanocomposite ¯lm thereby o®ering improved p – njunction characteristics.

Linkage disequilibrium and population-structure analysis among Capsicum annuum L. cultivars for use in association mapping

Nimmakayala, Padma,Abburi, Venkata L.,Abburi, Lavanya,Alaparthi, Suresh Babu,Cantrell, Robert,Park, Minkyu,Choi, Doil,Hankins, Gerald,Malkaram, Sridhar,Reddy, Umesh K. Springer-Verlag 2014 Molecular genetics and genomics Vol.289 No.4

<P>Knowledge of population structure and linkage disequilibrium among the worldwide collections of peppers currently classified as hot, mild, sweet and ornamental types is indispensable for applying association mapping and genomic selection to improve pepper. The current study aimed to resolve the genetic diversity and relatedness of Capsicum annuum germplasm by use of simple sequence repeat (SSR) loci across all chromosomes in samples collected in 2011 and 2012. The physical distance covered by the entire set of SSRs used was 2,265.9 Mb from the 3.48-Gb hot-pepper genome size. The model-based program STRUCTURE was used to infer five clusters, which was further confirmed by classical molecular-genetic diversity analysis. Mean heterozygosity of various loci was estimated to be 0.15. Linkage disequilibrium (LD) was used to identify 17 LD blocks across various chromosomes with sizes from 0.154 Kb to 126.28 Mb. CAMS-142 of chromosome 1 was significantly associated with both capsaicin (CA) and dihydrocapsaicin (DCA) levels. Further, CAMS-142 was located in an LD block of 98.18 Mb. CAMS-142 amplified bands of 244, 268, 283 and 326 bp. Alleles 268 and 283 bp had positive effects on both CA and DCA levels, with an average R(2) of 12.15 % (CA) and 12.3 % (DCA). Eight markers from seven different chromosomes were significantly associated with fruit weight, contributing an average effect of 15 %. CAMS-199, HpmsE082 and CAMS-190 are the three major quantitative trait loci located on chromosomes 8, 9, and 10, respectively, and were associated with fruit weight in samples from both years of the study. This research demonstrates the effectiveness of using genome-wide SSR-based markers to assess features of LD and genetic diversity within C. annuum.</P>

Isolation, Screening, and Selection of an L-glutaminase Producer from Soil and Media Optimization Using a Statistical Approach

Iyer Padma,Rekha Singhal 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.6

A culture isolated from garden soil was found to be a promising L-glutaminase producer. Biochemical identification tests and 16S rRNA sequencing identified this isolate to be Klebsiella oxytoca. Subsequently, media optimization using one-factor-at-a-time approach and response surface methodology was undertaken. A face centered central composite design was employed to investigate the interactive effects of four variables, viz. concentrations of maltose, yeast extract, beef extract, and ammonium acetate on glutaminase production. Almost all factors had significant interactive effects on glutaminase production. A medium containing (g/L): maltose, 23.31; yeast extract, 20.0; beef extract, 20.01; ammonium acetate, 10.0; mannitol, 10.0;KH2PO4, 0.4; Na2SO4, 0.4; and MgCl2, 0.4 was optimum for glutaminase production. The applied methodology was validated using this optimized media and enzyme activity of 458.91 ± 9.49 U/L and specific activity of 0.441 ± 0.04U/mg protein after 42 h of incubation at 33oC were obtained.