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Siva Kota Reddy,Vijay,Lokesha 장전수학회 2009 Proceedings of the Jangjeon mathematical society Vol.12 No.3
A signed graph (marked graph) is an ordered pair S = (G, σ) (S = (G, μ)), where G = (V,E) is a graph called the underlying graph of S and σ : E → {+, −} (μ : V → {+, −}) is a function. The n-th power graph of a graph G = (V,E) is a graph Gn = (V,E'), with same vertex set as G, and has two vertices u and v are adjacent if their distance in G is n or less. Analogously, one can define the nth power signed graph of a signed graph S = (G, σ). Consider the marking μ on vertices of S defined as follows: each vertex v ∈ V , μ(v) is the product of the signs on the edges incident at v. The nth power signed graph of S is a signed graph Sn = (Gn, σ') where Gn is the underlying graph of Sn, where for any edge e = uv 2 Gn, 0(uv) = μ(u)μ(v). It is shown that for any signed graph S, its nth power signed graph Sn is balanced. We then give structural characterization of n-th power signed graphs. Two signed graphs S1 and S2 are switiching equivalent written S1 ~ S2, whenever there exists a marking μ of S1 such that the signed graph Sμ(S1) obtained by changing the sign of every edge of S1 to its opposite whenever its end vertices are of opposite signs, is isomorphic to S2. Further, we present solutions of some signed graph switching equations involving the line signed graph, complement and n-th power signed graph operations. One such equation (L(S))n ~ S generalizes a result of P. Siva Kota Reddy and M. S. Subramanya (L(S) ~ S) [11].
Siva Kaylasa Sundari Saravanamuthu,Shamim Rishwana Syed Mohammed,Ramani Ramasubbu,Arunjunai Raj Mahendran,Vijayakumar Chinnaswamy Thangavel 한국고분자학회 2022 폴리머 Vol.46 No.4
In this work, the synthesized nanoporous aluminum fumarate (Al_FA_A) metal organic framework (MOF) hasbeen used as reactive filler for the bisphenol-A dicyanate (BADCy) resin system. The use of Al_FA_A is interesting dueto the involvement of double bonds (fumarate) in triazine during polymerization. The thermal properties of the polymersformed with and without reactive filler were evaluated under different curing temperatures, prepolymerizations and postpolymerizations conditions. All the samples were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction analysis (XRD) andEvolved gas analysis. On the contrary, the cure chemistry was determined by non-isothermal model free kinetic methods. This study provides a new path to utilize the MOFs as reactive nanoparticle fillers to obtain multifunctional materials.
Advancements in temporomandibular joint total joint replacements (TMJR)
Siva Kumar Mamidi,Klutcharch,Shradha Rao,Julio C. M. Souza,Louis G. Mercuri,Mathew T. Mathew 대한의용생체공학회 2019 Biomedical Engineering Letters (BMEL) Vol.9 No.2
The goal of this paper is to review the advantages and disadvantages of the various treatment options of temporomandibularjoint (TMJ) total joint replacement (TJR). TMJ articles published within the last 20 years were reviewed to collect the informationon non-invasive and invasive TMD treatment methods. Recent technological advancements helped the evolution oftreatment methods and off ered signifi cant value to TMD patients and surgeons. Considering the TMD levels, the therapeuticprocedures can involve general health examiniations, physical therapy, medication, oral rehabilation or as an end stage clinicalinvention, temporomandibular joint replacement. In fact when intra-articular TMD is present, the eff ective treatmentmethod appears to be TJR. However, concern for infection, material hypersensitivity, device longevity and screws looseningissues still exists. Further combined research utilizing the knowledge and expertise of, surgeons, material scientists, andbioengineers is needed for the development of improved TMD therapeutic treatment.
A Brief Review on Variables and Test Priorities of Photovoltaic Module Life Expectancy
Siva Parvathi Padi,Sanchari Chowdhury,Muhammad Aleem Zahid,Jaeun Kim,Eun-Chel Cho,Junsin Yi 한국태양광발전학회 2021 Current Photovoltaic Research Vol.9 No.2
To endorse the reliability and durability of the solar photovoltaic (PV) device several tests were conducted before exposing to the outdoor field in a non-ideal condition. The PV module has high probability that intend to perform adequately for 30 years under operating conditions. To evaluate the long term performance of the PV module in diversified terrestrial conditions, one should use the outdoor performance data. However, no one wants to wait for 25 years to determine the module reliability. The accelerating stress tests performing in the laboratory by mimicking different field conditions are thus important to understand the performance of a PV module. In this review, we will discuss briefly about different accelerating stress types, levels and prioritization that are used to evaluate the PV module reliability and durability before using them in real field.
Human Adipose Tissue Derivatives as a Potent Native Biomaterial for Tissue Regenerative Therapies
Siva Sankari Sharath,Janarthanan Ramu,Shantikumar Vasudevan Nair,Subramaniya Iyer,Ullas Mony,Jayakumar Rangasamy 한국조직공학과 재생의학회 2020 조직공학과 재생의학 Vol.17 No.2
Background: Human adipose tissue is a great source of translatable biomaterials owing to its ease of availability and simple processing. Reusing discardable adipose tissue for tissue regeneration helps in mimicking the exact native microenvironment of tissue. Over the past 10 years, extraction, processing, tuning and fabrication of adipose tissue have grabbed the attention owing to their native therapeutic and regenerative potential. The present work gives the overview of next generation biomaterials derived from human adipose tissue and their development with clinical relevance. Methods: Around 300 articles have been reviewed to widen the knowledge on the isolation, characterization techniques and medical applications of human adipose tissue and its derivatives from bench to bedside. The prospective applications of adipose tissue derivatives like autologous fat graft, stromal vascular fraction, stem cells, preadipocyte, adipokines and extracellular matrix, their behavioural mechanism, rational property of providing native bioenvironment, circumventing their translational abilities, recent advances in featuring them clinically have been reviewed extensively to reveal the dormant side of human adipose tissue. Results: Basic understanding about the molecular and structural aspect of human adipose tissue is necessary to employ it constructively. This review has nailed the productive usage of human adipose tissue, in a stepwise manner from exploring the methods of extracting derivatives, concerns during processing and its formulations to turning them into functional biomaterials. Their performance as functional biomaterials for skin regeneration, wound healing, soft tissue defects, stem cell and other regenerative therapies under in vitro and in vivo conditions emphasizes the translational efficiency of adipose tissue derivatives. Conclusion: In the recent years, research interest has inclination towards constructive tissue engineering and regenerative therapies. Unravelling the maximum utilization of human adipose tissue derivatives paves a way for improving existing tissue regeneration and cellular based therapies and other biomedical applications.
Siva, Vantari,Park, Kwangwook,Kim, Min Seok,Kim, Yeong Jae,Lee, Gil Ju,Kim, Min Jung,Song, Young Min Springer US 2019 Nanoscale research letters Vol.14 No.1
<P>The phosphorus-doped ZnO nanorods were prepared using hydrothermal process, whose structural modifications as a function of doping concentration were investigated using X-ray diffraction. The dopant concentration-dependent enhancement in length and diameter of the nanorods had established the phosphorus doping in ZnO nanorods. The gradual transformation in the type of conductivity as observed from the variation of carrier concentration and Hall coefficient had further confirmed the phosphorus doping. The modification of carrier concentration in the ZnO nanorods due to phosphorus doping was understood on the basis of the amphoteric nature of the phosphorus. The ZnO nanorods in the absence of phosphorus showed the photoluminescence (PL) in the range of the ultraviolet (UV) and visible regimes. The UV emission, i.e. near-band-edge emission of ZnO, was found to be red-shifted after the doping of phosphorus, which was attributed to donor-acceptor pair formation. The observed emissions in the visible regime were due to the deep level emissions that were aroused from various defects in ZnO. The Al-doped ZnO seed layer was found to be responsible for the observed near-infrared (NIR) emission. The PL emission in UV and visible regimes can cover a wide range of applications from biological to optoelectronic devices.</P>
Siva Pratap Reddy Mallem,Peddathimmula Puneetha,Kalupudi Subramanyam,Varra Rajagopal Reddy,이동연,김영래,안성진,박귀일 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
Cubic-structured europium (Eu) doped zinc sulfide (ZnS) nanoparticles (NPs) were prepared via refluxing at 150 °C. Absolute structural studies showed that Eu+ ions were successfully substituted into the ZnS host lattice and changed the original structure of the host. As-fabricated ZnS:Eu NPs exhibited typical red emission due to the transition of the Eu dopant in the 5d0-7f1, 5d0-7f2, 5d0-7f3, and 5d0-7f4 energy levels of the 4f orbital of the dopant. The typical diamagnetic ZnS could be converted to tunable paramagnetic as a function of Eu-doping content. These NPs were quantified for hydrogen evolution through water splitting by artificial solar spectrum. Eu doping can drastically enhance the hydrogen (H2) evolution capability of ZnS, which is higher than that of bare ZnS NPs. The causes behind these engrossing results will be revealed. These interesting properties may find applications in optoelectronics, spintronics, and H2 evolution.
A Brief Review on Recent Developments in MAPbI3 Perovskite-Based Transistors
Siva Parvathi Padi,김태용,라벨로 마테우스,이준신 한국전기전자재료학회 2021 전기전자재료학회논문지 Vol.34 No.5
Field-effect transistors (FETs) are the key elements of conventional electronics; hence, have drawn a lot of research and commercial interests. In recent years, metal halide perovskite materials have achieved a remarkable efficiency of 29.15% in the field of photovoltaics, and have drawn the scientific community’s attention to promote their use in the field of optoelectronics, such as FETs and phototransistors. The MAPbI3 (methylammonium lead iodide) perovskite TFT has achieved a record hole mobility of 21.41 cm2/V-s in the year 2020. In this review, we will briefly discuss the physical structure of MAPbI3 perovskite and the essential factors that stimulate these devices, together with the role of defects, the ion migration concept, and the implication of both dielectric and electrode materials on the device’s performance.