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Ranjini Srinivasan,Jennifer A. Faerber,Grace DeCost,Xuemei Zhang,Michael DiLorenzo,Elizabeth Goldmuntz,Mark Fogel,Laura Mercer-Rosa 한국심초음파학회 2022 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.30 No.1
BACKGROUND: Little is known regarding right ventricular (RV) remodeling immediately after Tetralogy of Fallot (TOF) repair. We sought to describe myocardial deformation by cardiac magnetic resonance imaging (CMR) after TOF repair and investigate associations between these parameters and early post-operative outcomes. METHODS: Fifteen infants underwent CMR without sedation as part of a prospective pilot study after undergoing complete TOF repair, prior to hospital discharge. RV deformation (strain) was measured using tissue tracking, in addition to RV ejection fraction (EF), volumes, and pulmonary regurgitant fraction. Pearson correlation coefficients were used to determine associations between both strain and CMR measures/clinical outcomes. RESULTS: Most patients were male (11/15, 73%), with median age at TOF repair 53 days (interquartile range, 13,131). Most patients had pulmonary stenosis (vs. atresia) (11/15, 73%) and 7 (47%) received a transannular patch as part of their repair. RV function was overall preserved with mean RV EF of 62% (standard deviation [SD], 9.8). Peak radial and longitudinal strain were overall diminished (mean ± SD, 33.80 ± 18.30% and −15.50 ± 6.40%, respectively). Longer hospital length of stay after TOF repair was associated with worse RV peak radial ventricular strain (correlation coefficient (r), −0.54; p = 0.04). Greater pulmonary regurgitant fraction was associated with shorter time to peak radial RV strain (r = −0.55, p = 0.03). CONCLUSIONS: In this small study, our findings suggest presence of early decrease in RV strain after TOF repair and its association with hospital stay when changes in EF and RV size are not yet apparent.
On the Shultz index of the subdivision graphs
P. S. Ranjini,V. Lokesha,M. A. Rajan,M. Phani Raju 장전수학회 2011 Advanced Studies in Contemporary Mathematics Vol.21 No.3
In this paper we concern with the Shultz index of the subdivision graph and calculated the explicit expressions for the Shultz index of the subdivision graph of the complete graph S_n, tadpole graph T_n,_k, the wheel graph W_(n+1), the helm graph H_(n+1) and the ladder graph L_n,
TREES AND UNICYCLIC GRAPHS EXTREMAL WITH RESPECT TO SUM CONNECTIVITY INDEX
P. S. Ranjini 장전수학회 2014 Proceedings of the Jangjeon mathematical society Vol.17 No.3
The general Sum Connectivity Index of a graph G is defined as ξα(G) = Σ (u) + d(v)]α, where d(u) denotes the degree of the vertex u in G and uv ∈ E(G). where α is a real number. We deals with the case α ≥ 1. In this paper we studied some graph transformations which increase or decrease the general sum connectivity index. As a consequence of this, obtained the extremal of this index for the classes of trees and unicyclic graph.
Dynamic Cell Reconfiguration Framework for Energy Conservation in Cellular Wireless Networks
손규호,Ranjini Guruprasad,Santosh Nagaraj,Mahasweta Sarkar,Sujit Dey 한국통신학회 2016 Journal of communications and networks Vol.18 No.4
Several energy saving techniques in cellular wireless networkssuch as active base station (BS) selection, transmit powerbudget adaptation and user association have been studied independentlyor only part of these aspects have been considered togetherin literature. In this paper, we jointly tackle these three problemsand propose an integrated framework, called dynamic cell recon-figuration (DCR). It manages three techniques operating on differenttime scales for ultimate energy conservation while guaranteeingthe quality of service (QoS) level of users. Extensive simulationsunder various configurations, including the real dataset ofBS topology and utilization, demonstrate that the proposed DCRcan achieve the performance close to an optimal exhaustive search. Compared to the conventional static scheme where all BSs are alwaysturned on with their maximum transmit powers, DCR cansignificantly reduce energy consumption, e.g., more than 30% and50% savings in uniform and non-uniform traffic distribution, respectively.
Dynamic Cell Reconfiguration Framework for Energy Conservation in Cellular Wireless Networks
Son, Kyuho,Guruprasad, Ranjini,Nagaraj, Santosh,Sarkar, Mahasweta,Dey, Sujit The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
Several energy saving techniques in cellular wireless networks such as active base station (BS) selection, transmit power budget adaptation and user association have been studied independently or only part of these aspects have been considered together in literature. In this paper, we jointly tackle these three problems and propose an integrated framework, called dynamic cell reconfiguration (DCR). It manages three techniques operating on different time scales for ultimate energy conservation while guaranteeing the quality of service (QoS) level of users. Extensive simulations under various configurations, including the real dataset of BS topology and utilization, demonstrate that the proposed DCR can achieve the performance close to an optimal exhaustive search. Compared to the conventional static scheme where all BSs are always turned on with their maximum transmit powers, DCR can significantly reduce energy consumption, e.g., more than 30% and 50% savings in uniform and non-uniform traffic distribution, respectively.
Trees, unicyclic graphs extremal with respect to Kekule index
Usha.A,P. S. Ranjini,V.Lokesha 장전수학회 2014 Advanced Studies in Contemporary Mathematics Vol.24 No.3
For a molecular graph G with vertex set V(G) and edge set E(G), recently Lavanya, [1] introduced a new topologial index, the Kekule index is defined as (formula) where, (formula) and i and j are the degrees of the vertices u and v respectively. In this paper, we characterize the trees and unicyclic graphs extremal with respect to Kekule index.
Subdivision and semi total point graphs of Archimedean lattices on some topological indices
N. Ananda,P. S. Ranjini,V.Lokesha,S.A. Wazzan 장전수학회 2019 Proceedings of the Jangjeon mathematical society Vol.22 No.4
It is well known that any topological index is a type of molecular descriptor that is calculated based on the molecular graph of a chemical compound. In this paper, we investigate subdivision and semi total point graphs of the Archimedean lattices L(4;6;12) for the topological indices Nano- Zagreb index, multiplicative Nano-Zagreb index, V L-index, Atom bond connectivity index, Inverse sum indeg index, Forgotten index, Augmented Zagreb index, Geometric-Arithmetic index, SK-index and Hyper Zagreb index.
The Wiener Polynomial for the Subdivision Graph of Certain Classes of Graphs
S. Shetty,V. Lokesha,P. Raju,S. Ranjini 장전수학회 2015 Advanced Studies in Contemporary Mathematics Vol.25 No.4
One of the oldest distance-based topological index, the Wiener index is studied and expressions for the Wiener polynomial of the subdivision graph of the crown graph, trampoline graph, barbell graph and fan graph are presented here.
INVESTIGATION ON SOME TOPOLOGICAL INDICES OF CARBON NANOBUD THROUGH M-POLYNOMIAL
DEEPASREE S KUMAR,P. S. Ranjini,V. Lokesha 장전수학회 2022 Proceedings of the Jangjeon mathematical society Vol.25 No.4
Topological indices are popular descriptors used in chemical graph theory. These are basically numerical values that correlate the topology of chemical compounds to its different physical properties and synthetic reactivities. Among different classes of topological indices, degree based topological indices have prominent role in characterising the topology of molecular graph and are widely used in quantitative structure property relationship (QSPR) and quantitative structure activity relationship (QSAR) studies. Carbon Nanobud exhibits superior properties compared to both Nanotubes and Fullerene. Structure of Carbon nanobud is achieved by fusion of fullerene and Nanotubes with carbon-carbon covalent bond connections between them. Some of the popular degree based topological indices of a typical Nanobud molecular structure is estimated in this article. Here we considered a single fullerene (C60), attached on the surface of a zigzag Single Walled Carbon Nanotube (SWNT) by a [2 x 2] cyclo-addition.