289 research outputs found
Hybrid lunar inflatable structure
No full textBefore man had even stepped foot on the lunar surface, the idea of establishing a base was discussed extensively, be it in science fiction or academia. Although, to this day there has not been an actual base on the Moon, many studies have been conducted regarding design possibilities and environmental impacts. There exists a prevalent challenge in regards to the predictability of the effects the lunar environment has on surface structures. This thesis discusses those aspects of lunar habitats and proposes a new design concept.M.S.Includes bibliographical referencesby Rohith Dronadul
Institutional and Economic Dynamics of Water Users Cooperative (WUC) Societies in Cauvery Basin of Karnataka
No full textThe economic and institutional dimensions of water users cooperative (WUC) societies have been analyzed with regards to performance, membership and transaction costs in forming organization in the Cauvery basin of Karnataka. Field data have been collected from presidents and members of 30 WUC societies in Tirumakudalu Narasipura taluk of Mysore, Karnataka. Using cluster analysis, these have been grouped into (i) well performing, (ii) moderately performing, and (iii) poorly performing WUC societies. To understand institutional and economic dimensions, the selected WUC societies have been grouped based on command area, membership and conjunctive use of water. The odds ratio determined using logit model has indicated that for every one chance of not willing to pay additional water charges, there are seven chances of willingness to pay. Landholding size of farmer, conjunctive use and distance of the farm from canal have been found to significantly influence his/her willingness to pay for the assured summer irrigation. The mean willingness to pay amount for assured summer canal water has been found as ` 178 over and above the existing charge of ` 100. With all the odds being faced by these cooperatives, this study has revealed the inner strength of water user cooperative societies in canal water distribution through collective action.Water users cooperative society, Institutional economics, Water institutions, Cauvery Basin, Agricultural and Food Policy, Q13, Q15, Q25, K00,
A Structural and Algorithmic Study of Stable Matching Lattices of "Nearby" Instances, with Applications
No full textRecently [Mai and Vazirani, 2018] identified and initiated work on a new problem, namely understanding structural relationships between the lattices of solutions of two "nearby" instances of stable matching. They also gave an application of their work to finding a robust stable matching. However, the types of changes they allowed in going from instance A to B were very restricted, namely any one agent executes an upward shift.
In this paper, we allow any one agent to permute its preference list arbitrarily. Let M_A and M_B be the sets of stable matchings of the resulting pair of instances A and B, and let ℒ_A and ℒ_B be the corresponding lattices of stable matchings. We prove that the matchings in M_A ∩ M_B form a sublattice of both ℒ_A and ℒ_B and those in M_A ⧵ M_B form a join semi-sublattice. These properties enable us to obtain a polynomial time algorithm for not only finding a stable matching in M_A ∩ M_B, but also for obtaining the partial order, as promised by Birkhoff’s Representation Theorem [Birkhoff, 1937]. As a result, we can generate all matchings in this sublattice.
Our algorithm also helps solve a version of the robust stable matching problem. We discuss another potential application, namely obtaining new insights into the incentive compatibility properties of the Gale-Shapley Deferred Acceptance Algorithm
Dependence of equilibrium stacking fault width on thickness of Cu thin films: A molecular dynamics study
No full textIntraseasonal filtered bottom pressure recorder at 37.283°W, 32.2548°N
No full textIntraseasonal (30-80 days) filtered equivalent water depth extracted from bottom pressure recorder located at 37.283°W, 32.2548°N. The data is de-tidal and also gone through two stage quality control (Rohith et. al., 2019). The data is collected under EMSO (European Multidisciplinary Seafloor Observatory)
Exploiting multi-path for safeguarding mmWave communications against randomly located eavesdropper
No full textCommunication in the millimeter-wave (mmWave) band has enabled giga-bit-per-second data rates for next generation wireless systems. To this end, physical layer security techniques have emerged as a simple and yet effective way to safeguard these systems against eavesdropping attacks. These techniques make use of the large antenna arrays available in mmWave systems to provide an array gain at the target receiver and obfuscate the signal at the eavesdropper. Despite their effectiveness, majority of these techniques are based on line-of-sight communication links between the transmitter and the receiver, and may fail in the presence of blockages or non-line of-sight links. In this project, we propose a new physical layer security technique to safeguard communication systems against randomly located eavesdroppers. Numerical results demonstrate the effectiveness of proposed technique and show that higher secrecy rate can be obtained when compared to recently proposed techniques
Retracted: When a giant ovarian cyst poses a diagnostic dilemma
No full textThe article " When a giant ovarian cyst poses a diagnostic dilemma" is retracted by the Editor-in-Chief, on the request of corresponding author and co-authors. The corresponding author informed that the patient described in this article, although willingly gave her consent for revealing her clinical data for publication, later withdrew her consent after knowing about the publication of clinical material during she came for a follow up visit
Closed-Loop Non-Invasive Brain Stimulation as a Fatigue Countermeasure
No full textCognitive fatigue is a pressing issue across multiple job domains, especially within safety critical systems, where fatigue-driven lapses in operator performance and behavior have resulted in costly errors. While the importance of rest and fatigue management is known and widely acknowledged, sustainable solutions to address the core problem remain far and few between.
A major bottleneck remains a lack of clarity on the nature of the phenomenon, where a task in-variant operational definition is impeded by individual differences, confounds related to workload, motivation or saturation, and the classic incongruities between performance or perception-centric views of the construct. Furthermore, mitigation strategies have rarely strayed beyond consumables (e.g. caffeine) or pharmacological aids that are used on an ad-hoc basis. Therefore, there is an imminent need to develop alternatives that could sustainably redress these conditions, and advance solutions that are explicitly informed by user cognitive states.
To that end, this dissertation investigates the operational significance, the mechanistic relevance, and fieldability barriers associated with the use of non-invasive brain stimulation (NIBS) as a fatigue countermeasure. Low intensity electrical stimulation of brain regions responsible for cognitive faculties such as attention, vigilance, and working memory has shown promise across a myriad task contexts, and lends confidence to its use as a fatigue countermeasure in related experiments. A fatiguing working memory exercise serves as the sandbox to investigate the parameters of interest for NIBS on fatigue effects. Stimulation was shown to enhance task performance, while the subjective perceptions of fatigue remain unaltered. Cerebral hemodynamics reveal structural and functional disparities of fatigue effects over the time course of the experiment, with cardiac activity, captured unobtrusively, shown to mirror the changes observed across task-relevant cortical networks. This observation lends confidence to the predictive potential of cardiac measures as neurocognitive indices of fatigue states, however, the search for the underlying ground truth that qualifies these states remains an open question. This dissertation explores the specific challenges and benefits that come from taking performance and perception-centric views of fatigue, while proposing alternatives derived from cardiac heuristics to successfully forecast these states over a desired prediction horizon.
Together the evidence found in this dissertation provide the necessary foundation for the development of a closed-loop framework for mitigating fatigue states in related experiments. However, the domain translation and task-invariability demands of these observations demand more ecologically valid task contexts, and extensive validation studies in future assessments
Pole Changing Wide Speed Range Induction Motor Drive for Electric Vehicles
No full textThe paper presents a two phase variable speed induction motor drive for wide speed application. The drive is designed to meet drive cycle requirements of Worldwide harmonized Light vehicles Test Procedure (WLTP). The required torque speed specifications of the induction machine are obtained from the drive cycle. The wide speed range operation of the drive obtained by pole changing technique. The proposed induction motor drive system consists of an online pole changing two phase induction motor which is driven using a four leg voltage source converter. Using the voltage source converter currents are controlled in certain coil groups of the machine to enable operation as two pole and four pole motor. The paper describes the windings configuration and operation of the two phase induction machine drive
Applications of Fixator-norator Pair in Companion Model Based Designs
No full textAbstractThis paper presents a novel approach to the accurate time domain analysis and design of analog circuits containing storage elements by making use of ‘companion models’. The emphasis is given to the design using fixator-norator pair, which is now ingenious in analog circuit design. The Backward Euler method can render a storage element to an equivalent circuit, containing only linear components viz. current source or voltage source and resistance. This distinctive feature allows us to generate equivalent companion models of the storage elements for every time step, whereby persuading the application of fixator-norator pairs in such circuits containing reactive components. This paper briefly explains the construction of equivalent circuits at desired time steps and provides a detailed explanation on the design of the gain of an op-amp differentiator for a given input by exploiting the fixator-norator method. The proposed method reveals to be much reliable and accurate in the design of circuits containing reactive elements
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