2021
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Item On some distributed scheduling algorithms for wireless networks with hypergraph interference models(IEEE, 2021-05-01) Ganesan, AshwinIt is shown that the performance of the maximal scheduling algorithm in wireless ad hoc networks under the hypergraph interference model can be further away from optimal than previously known. The exact worst-case performance of this distributed, greedy scheduling algorithm is analyzed.Item Performance analysis of a distributed algorithm for admission control in wireless networks under the 2-hop interference model(ICDCN, 2021-01-05) Ganesan, AshwinA general open problem in networking is: what are the fundamental limits to the performance that is achievable with some given amount of resources? More specifically, if each node in the network has information about only its 1-hop neighborhood, then what are the limits to performance? This problem is considered for wireless networks where each communication link has a minimum bandwidth quality-of-service (QoS) requirement. Links in the same vicinity contend for the shared wireless medium. The conflict graph captures which pairs of links interfere with each other and depends on the MAC protocol. In IEEE 802.11 MAC protocol-based networks, when communication between nodes i and j takes place, the neighbors of both i and j remain silent. This model of interference is called the 2-hop interference model because the distance in the network graph between any two links that can be simultaneously active is at least 2. In the admission control problem studied in the present paper, the objective is to determine, using only localized information, whether a given set of flow rates is feasible. In the present work, a distributed algorithm is proposed for this problem, where each node has information only about its 1-hop neighborhood. The worst-case performance of the distributed algorithm, i.e. the largest factor by which the performance of this distributed algorithm is away from that of an optimal, centralized algorithm, is analyzed. Lower and upper bounds on the suboptimality of the distributed algorithm are obtained, and both bounds are shown to be tight. The exact worst-case performance is obtained for some ring topologies. While distance-d distributed algorithms have been analyzed for the 1-hop interference model, an open problem in the literature is to extend these results to the K-hop interference model, and the present work initiates the generalization to the K-hop interference model.Item Three-Dimensional Printing of Synthesized Eight Link Gear Variable Topology Mechanism with Fused Deposition Modeling Technique(HAL Open Science, 2021-08-08) Daivagna, Umesh M.The paper demonstrates three-dimensional (3D) printing of synthesized mechanism with the aid of fused deposition modeling technique (FDM). The mechanism taken into consideration is eight link gear variable topology mechanism having two degrees of freedom. The over view of synthesized mechanism is dealt with and the determined parameters are considered for printing of the mechanism. Various 3D printing techniques are available and the paper focuses on FDM which appears to the part of additive manufacturing. This process creates an insight to the practical observation of mechanism behavior before proceeding to fabrication.Item Insights into the structure and ionic transport in ‘water-in-bisalt’ electrolytes for lithium-ion batteries(Royal Society of Chemistry, 2021-07-02) Kartha, Thejus R.We investigated the dynamics and transport of lithium-ion water-in-bisalt (WiBS) electrolytes that contain lithium bis(trifluorosulfonimide) (LiTFSI) and lithium triflate (LiOTf) at different concentrations and temperatures using classical molecular dynamics simulations. The presented results are helpful to access the advantages of their use as electrolytes in Li-ion batteries. The structural analysis shows that the Li-ions have analogous interactions with the oxygen atoms of TFSI, OTf- and water. The calculated ionic conductivities from the current autocorrelation function are close to the experimental data for all the concentrations except the lowest one, in which case, the correlated conductivity is close to the experiment. However, the Nernst–Einstein route for calculating ionic conductivity overestimates the values by a reasonably high margin. Ion-cage correlation dynamics show increasing ion-cage lifetimes with increasing concentration, which indicates that the Li-ions remain within the anionic cages for a longer time at higher concentrations. At higher temperatures, this lifetime is seen to decrease. The statistics of non-coordinated Li-ions that are free from TFSI- and OTf- support the ion-cage dynamics.Item Is Diversity a Source of Sustainable Competitive Advantage?(Apeejay School of Management, 2021-01-01) Panwar, TapishSeveral sources of competitive advantage have been identified by researchers in past. These sources vary from technological advancement to financial might, and design expertise to human resources. Organizations interpret these sources of competitive advantage in their way which helps them earn a unique position against the competition. Lately, the diversity of the workforce which is seen as a component of human resources has been discussed for its ability to differentiate against the competition. While several examples point towards diversity being an advantage for an organization, there is not enough support for the argument that such an advantage is sustainable in nature. Sustainability has been defined as a long-term strategic positioning against the competition based on a stable source of competitive advantage. In this article, we shed light upon the sustainability aspect of diversity as a competitive advantage by citing exhaustive work undertaken by researchers in this area.