373 research outputs found
Speaker Recognition and Diarization
No full textItem does not contain fulltextThis chapter contains sections titled:
Introduction
Common Approaches to Speaker Diarization and Recognition
Speaker Diarization
Speaker Recognition
Conclusions
Reference
Parametric Analysis of GFRP Drilling
No full textAim of the work is to study the influence of the interaction between the fibres/matrix and the tool on the cutting force in drilling of glass fibre reinforced polymers (GFRP). Experimental analysis has been developed machining monodirectional and fabric GFRP. Instantaneous variation of the cutting force are described under different cutting conditions and fibre layout. The experimental results shown that the instantaneous variation of the force can be fundamental to introduce delamination damage in composites
Identification of Leaf Spot Causing Pathogen Through ITS Sequencing in Clove and it's Management Using Bioagents, Botanicals and Chemicals
No full textClove tree is mostly grown in the hilly tracts of Tamil Nadu and Kerala. The leaves of clove seedling and grown up trees were frequently infected with leaf spot disease. The pathogen inciting leaf spot disease was isolated and identified as Colletotrichumgloeosporioides based on ITS1 5.8s, ITS 2 rDNA sequence analysis. The present study was concerned with bio agents, fungicides and botanicals which were tested against C. gloeosporioides. Among the bio agents, Trichodermaharzianum was found effective with 72.22 growth inhibition. Among the botanicals , garlic extract at 5 and 10 concentration levels was found to be effective with 56.66 and 62.66 growth inhibition respectively followed by ginger extract 48.88 and 49.66 growth inhibition. Among chemicals,propiconazole 0.1 and 0.2 was found to be the most effective fungicide in inhibiting 100 growth of C. gloeosporioides followed by hexaconazole with 87.44 and 88.55 growth inhibition at 0.1 and 0.2 respectively. S. Aravindasamy | Dr. R. Kannan | Dr. M. Jayasekhar | Dr. R. Swarnapriya | Dr. V. Ramamoorthy "Identification of Leaf Spot Causing Pathogen Through ITS Sequencing in Clove and it's Management Using Bioagents, Botanicals and Chemicals" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-5 , August 2018, URL: https://www.ijtsrd.com/papers/ijtsrd15855.pd
Automatic segmentation of cyclic program structures based on connectivity and processor timing
No full textTime-shared, multiprogrammed, and overlayed batch systems frequently require segmentation of computer programs into discrete portions. These program portions are transferred between executable and peripheral storage whenever necessary; segmentation of programs in a manner that reduces the frequency of such transfers is the subject of this paper. Segmentation techniques proposed by C. V. Ramamoorthy are subject to limitations that arise when the preferred segment size is not compatible with the physical restrictions imposed by the available computing equipment. A generalization of Ramamoorthy's suggestions is made in order to allow their application when circumstances are other than ideal.</jats:p
“ Obesity serum factors affect human platelets SERT: we need a cellular model to investigate “
No full textAmongst molecules active in modulating 5-HT transmission, SERT exerts a main function by promoting 5-HT clearance and re-uptake into the pre-synaptic terminal, therefore controlling either the duration and extent of the transmitter action at specific targets after release or its “reserve” inside pre-synaptic vesicles. For this reason, SERT expression and function is under the control of several intracellular phosphorylation systems (Ramamoorthy et al. 2007). More recently, a relationship between obesity and inflammatory-immune response has been suggested (Matarese and La Cava, 2004), indicating a cross-talk between CNS and periphery in the control of body weight. In a preliminary attempt to elucidate these networks, the present study was thus designed to investigate the influence of 5-HT on body weight by measuring the equilibrium binding parameters (maximal binding capacity, Bmax and dissociation constant, Kd) of the high affinity SERT ligand [3H]-paroxetine in platelets from 174 subjects recruited on the basis of their body mass index (BMI), starting from 18 to > 40 kg/m2. The high affinity ligand [3H]-paroxetine was used as a selective tracer of SERT and subjects recruited to obtain five groups as regards to BMI: 1. normal weight (18-25 kg/ m2), 2. overweight (26-30 kg/ m2), 3. obese, I grade, (31-35 kg/ m2), 4. obese, II grade, (36-40 kg/ m2); 5. obese, III grade, (>40 kg/ m2). All subjects were also accurately monitored for clinical-biochemical parameters, including insulinemia and leptinemia blood glucose, insulin, leptin cytokines and other clinical-chemical parameters. We have chosen to study platelets as these non nucleate cells display an identical SERT to the brain one as well as several 5-HT receptor subtypes. For such reasons, platelets are considered “indicators” of 5-HT-regulated CNS-periphery connections and have been extensively studied in psychiatric-affective disorders since many years (Mellerup et al, 1983; Martini C. et al., 2004). Finally, platelets respond to agonist-induced activation by rapid phosphorilation and represent, therefore, a good model to study neuronal signal transduction events in periphery (Aharanovitz and Granot, 1996 ).
Our study is the first that showed a significant reduced SERT density in platelets of obese subjects (p<0.05), providing new insights in the role of 5-HT system and obesity.
Moreover, no BMI-dependent changes in [3H]-paroxetine Kd (nM) values, but a significant inverse correlation (p<0,0001) between [3H]-paroxetine Bmax values (fmol/mg protein) and BMI.
Consequently, a negative significant correlation was observed between [3H]-paroxetine Bmax values and: blood leptin, TNF-α, insulin, glicemia, PAS, aptoblobin and triglycerides.
In conclusion, these findings show that platelet SERT number is reduced in obese subjects and such a decrease could be linked, in part, to the efficiency of the insulin/adipokine-related downstream signaling cascade in periphery. These results could explain that adipose tissue entity are able to modulate SERT expression, but not his functionality, in platelets membrane.
Identification of isolated cellular model, capable to express SERT and having biochemical characteristics of platelet, could be useful to study the modulation of serotonin transporter by different factors related with obesity. We identified this model in MEG-01, a human megakaryoblastic leukaemia cell line, which specifically retains the morphological and functional properties of bone marrow megakaryocytes. This cell line is considered to be the most suitable one for evaluating human megakaryocytic maturation and differentiation into platelet-like cells (Isakari Y. et al 2007).
The evidence that SERT is present in megakaryoblasts suggests the physiological relevance of a balanced control of 5-HT levels during the differentiation processes leading to platelet formation (Liu YS et al 2006; Yang M et al 2007). After 8 days of MEG-01 cell culture with -TPA, significant cell morphological variations were observed, accompanied by changes in SERT immunostaining, from a perinuclear (undifferentiated cells) to a cytoplasm-diffuse (differentiated cells) fluorescence pattern. In -TPA activated MEG-01 cells a maximal increase of SERT mRNA was observed after 3 day of stimulation, reaching the steady state plateau; a moderate increase in protein expression was noticeable after 8 days of culture in-TPA, as shown by densitometric analysis of SERT immunoblot band and, even if not significantly, by 5-HT uptake results. 5-HT re-uptake experiments have shown that SERT is present in the plasma membrane of MEG-01 cells. Western blot revealed a single SERT band in control and treated cells, with an apparent size of 71 KDa, a M.W. comparable to that commonly reported for SERT in human brain and platelets (67-75 KDa). These findings demonstrate that megakaryoblastic cells increase SERT expression during megakaryocytopoiesis and that differentiation into megakaryocyte and proplatelet-like formation ensures an adequate SERT reserve and 5-HT storage in circulating platelets. The enhancement of SERT expression in -TPA treated cells seems in apparent contradiction with -TPA early events observed in platelets (Marazziti D et al 1999c; Jayanthi LD et al.2005; Carneiro AM et al. 2006). Nevertheless, some authors have reported that 1 M -TPA is able either to reduce (after 2h) or to stimulate (after 16 h) SERT uptake velocity in JAR placental cells (Ramamoorthy JD et al 1995). Jiang and coauthors (2002) have observed that both fibronectin and protein kinase C-dependent ERK1/2 MAPK activities are essential to promote megakaryoblastic differentiation. These authors have demonstrated that activation of protein kinase C alone (serum free -TPA stimulation) is not able to promote a full megakaryocytopoiesis process. Thus, the observed SERT increase might depend from -TPA-protein kinase C pathways and other signaling cascades. The protein kinase network and downstream signal convergent MAPK pathways could play a key role in SERT modulation. Proteomic analysis and gene expression studies together the use of selective protein kinase (also protein kinase C) or MAPK inhibitors will clarify the signaling pathways involved. On the basis of results we hypothesize that our findings derived from an equilibrium between different SERT regulatory effects: differentiation events, inducing morphological changes and leading to the formation of cytoskeleton-organized cells with 5-HT storage vesicles (Ogura M et al 1998), increase total SERT protein density (necessity to accumulate 5-HT in dense granules); phosphorylation, down-regulation and trafficking mechanisms (linked to cytoskeleton formation) can start having influence on SERT protein expression and function, especially in late events of megakaryocytopoiesis. This could explain the observed discrepancy between SERT mRNA and protein expression after 8 days of treatment with -TPA. We cannot, in fact, exclude that our Western blot protein extracts were enriched fractions of cytoplasm and plasma membrane components. These data seem to be in accordance with binding results obtained on cell membranes. Confocal microscopy of MEG-01 cells activated by TPA will verify SERT localization during early and late differentiation events. Since diverse protein regulatory patterns are present in immature megakaryoblasts cells as regards to pro-platelets and platelets (Tytgat GAM et al. 2002), the MEG-01 model should be primarily applied as a developmental model, for investigations regarding molecular differentiation events. For instance, it should be mentioned that a SERT regulatory endoproteolytic cleavage has been observed in human platelets, producing fragments of different size after immunoblot analysis, whereas a single SERT band was resolved in MEG-01 cell extracts, using the same primary antibodies, as here reported.
Megakaryoblastic MEG-01 differentiation is a complex phenomenon leading to up or down-regulation of a variety of genes (Isakari Y et al 2009). Nevertheless, taking into account all limits, the use of MEG-01 cells can be the starting point for many investigations as the evaluation of hormone and transmitter effects on megakaryoblastic differentiation.
Moreover, this cell line could be a cellular model to screen those of obesity serum factors are mostly important for long-term SERT down or up-regulation
Hartenstein-Delft-Sep2007.fm
No full textAbstract. Because of high energy consumption our computer-based infrastructure will become unaffordable -without reinventing the entire computing discipline, also due to cope with the manycore programming crisis. The paper highlights facts, trends, and a roadmap to by-pass this crisis and to reach new horizons. The term von Neumann syndrome has been coined by C. V. "RAM" Ramamoorthy in reply to my talk a
Semiconductors V. 39, I. 01
No full textSemiconductors -- January 2005
Volume 39, Issue 1, pp. 1-159
ATOMIC STRUCTURE AND NONELECTRONIC PROPERTIES OF SEMICONDUCTORS
Effect of the Parameters of Sapphire Substrates on the Crystalline Quality of GaN Layers
Yu. N. Drozdov, N. V. Vostokov, D. M. Gaponova, V. M. Danil'tsev, M. N. Drozdov, O. I. Khrykin, A. S. Filimonov, and V. I. Shashkin
pp. 1-3 Full Text: PDF (108 kB)
ELECTRONIC AND OPTICAL PROPERTIES OF SEMICONDUCTORS
Properties of the GaSb:Mn Layers Deposited from Laser Plasma
Yu. A. Danilov, E. S. Demidov, Yu. N. Drozdov, V. P. Lesnikov, and V. V. Podol'skii
pp. 4-7 Full Text: PDF (59 kB)
Effect of the Conditions of Metal–Organic Chemical-Vapor Epitaxy on the Properties of GaInAsN Epitaxial Films
V. M. Danil'tsev, D. M. Gaponova, M. N. Drozdov, Yu. N. Drozdov, A. V. Murel', D. A. Pryakhin, O. I. Khrykin, and V. I. Shashkin
pp. 8-10 Full Text: PDF (50 kB)
SEMICONDUCTOR STRUCTURES, INTERFACES, AND SURFACES
Growth of BGaAs Layers on GaAs Substrates by Metal–Organic Vapor-Phase Epitaxy
D. A. Pryakhin, V. M. Danil'tsev, Yu. N. Drozdov, M. N. Drozdov, D. M. Gaponova, A. V. Murel', V. I. Shashkin, and S. Rushworth
pp. 11-13 Full Text: PDF (53 kB)
Features of GaN Growth Attained by Metal–Organic Vapor-Phase Epitaxy in a Low-Pressure Reactor
O. I. Khrykin, A. V. Butin, D. M. Gaponova, V. M. Danil'tsev, M. N. Drozdov, Yu. N. Drozdov, A. V. Murel, and V. I. Shashkin
pp. 14-16 Full Text: PDF (53 kB)
LOW-DIMENSIONAL SYSTEMS
Effect of an Interfacial Oxide Layer on the Electroluminescence Efficiency of Metal–Quantum-Confined Semiconductor Heterostructures
N. V. Baidus', P. B. Demina, M. V. Dorokhin, B. N. Zvonkov, E. I. Malysheva, and E. A. Uskova
pp. 17-21 Full Text: PDF (125 kB)
Spectra of Persistent Photoconductivity in InAs/AlSb Quantum-Well Heterostructures
V. Ya. Aleshkin, V. I. Gavrilenko, D. M. Gaponova, A. V. Ikonnikov, K. V. Marem'yanin, S. V. Morozov, Yu. G. Sadofyev, S. R. Johnson, and Y.-H. Zhang
pp. 22-26 Full Text: PDF (76 kB)
Long-Time Photoluminescence Kinetics of InAs/AlAs Quantum Dots in a Magnetic Field
T. S. Shamirzaev, A. M. Gilinskii, A. K. Bakarov, A. I. Toropov, S. A. Figurenko, and K. S. Zhuravlev
pp. 27-29 Full Text: PDF (44 kB)
Electroluminescent Properties of Heterostructures with GaInNAs Quantum Wells
A. V. Murel', V. M. Danil'tsev, Yu. N. Drozdov, D. M. Gaponova, V. I. Shashkin, V. B. Shmagin, and O. I. Khrykin
pp. 30-32 Full Text: PDF (49 kB)
A Study of Recombination Centers Related to As–Sb Nanoclusters in Low-Temperature Grown Gallium Arsenide
P. N. Brunkov, A. A. Gutkin, Yu. G. Musikhin, V. V. Chaldyshev, N. N. Bert, S. G. Konnikov, V. V. Preobrazhenskii, M. A. Putyato, and B. R. Semyagin
pp. 33-36 Full Text: PDF (71 kB)
Effect of the Electrochemical Modification of a Thin Ga(In)As Cap Layer on the Energy Spectrum of InAs/GaAs Quantum Dots
I. A. Karpovich, A. V. Zdoroveishchev, S. V. Tikhov, P. B. Demina, and O. E. Khapugin
pp. 37-40 Full Text: PDF (57 kB)
Intersubband Absorption of Light in Heterostructures with Double Tunnel-Coupled GaAs/AlGaAs Quantum Wells
L. E. Vorob'ev, V. Yu. Panevin, N. K. Fedosov, D. A. Firsov, V. A. Shalygin, V. V. Kapaev, S. Hanna, S. Schmidt, E. A. Zibik, and A. Seilmeier
pp. 41-43 Full Text: PDF (52 kB)
Current Oscillations under Lateral Transport in GaAs/InGaAs Quantum Well Heterostructures
A. V. Antonov, V. I. Gavrilenko, E. V. Demidov, B. N. Zvonkov, and E. A. Uskova
pp. 44-49 Full Text: PDF (90 kB)
Optical Phenomena in InAs/GaAs Heterostructures with Doped Quantum Dots and Artificial Molecules
L. E. Vorob'ev, V. Yu. Panevin, N. K. Fedosov, D. A. Firsov, V. A. Shalygin, A. A. Andreev, Yu. B. Samsonenko, A. A. Tonkikh, G. E. Cirlin, N. V. Kryzhanovskaya, V. M. Ustinov, S. Hanna, A. Seilmeier, N. D. Zakharov, and P. Werner
pp. 50-53 Full Text: PDF (76 kB)
Calculation of the States of Shallow Donors in Quantum Wells in a Magnetic Field Using Plane Wave Expansion
V. Ya. Aleshkin and L. V. Gavrilenko
pp. 54-57 Full Text: PDF (49 kB)
The Effect of the Localization in a Quantum Well on the Lifetime of the States of Shallow Impurity Centers
E. E. Orlova, P. Harrison, W.-M. Zhang, and M. P. Halsall
pp. 58-61 Full Text: PDF (65 kB)
Cyclotron Resonance in Doped and Undoped InAs/AlSb Heterostructures with Quantum Wells
V. Ya. Aleshkin, V. I. Gavrilenko, A. V. Ikonnikov, Yu. G. Sadofyev, J. P. Bird, S. R. Johnson, and Y.-H. Zhang
pp. 62-66 Full Text: PDF (65 kB)
Terahertz Luminescence of GaAs-Based Heterostructures with Quantum Wells under the Optical Excitation of Donors
N. A. Bekin, R. Kh. Zhukavin, K. A. Kovalevskii, S. G. Pavlov, B. N. Zvonkov, E. A. Uskova, and V. N. Shastin
pp. 67-72 Full Text: PDF (77 kB)
Efficient Near IR Photoluminescence from Gallium Nitride Layers Doped with Arsenic
A. V. Andrianov, S. V. Novikov, I. S. Zhuravlev, T. Li, R. Xia, S. Bull, I. Harrison, E. C. Larkins, and C. T. Foxon
pp. 73-76 Full Text: PDF (64 kB)
Properties of Structures Based on Laser-Plasma Mn-Doped GaAs and Grown by MOC-Hydride Epitaxy
Yu. V. Vasil'eva, Yu. A. Danilov, Ant. A. Ershov, B. N. Zvonkov, E. A. Uskova, A. B. Davydov, B. A. Aronzon, S. V. Gudenko, V. V. Ryl'kov, A. B. Granovsky, E. A. Gan'shina, N. S. Perov, and A. N. Vinogradov
pp. 77-81 Full Text: PDF (71 kB)
A Study of the Properties of the Structures with Al Nanoclusters Incorporated into the GaAs Matrix
N. V. Vostokov, S. A. Gusev, V. M. Danil'tsev, M. N. Drozdov, Yu. N. Drozdov, A. I. Korytin, A. V. Murel, and V. I. Shashkin
pp. 82-85 Full Text: PDF (161 kB)
InGaAs/GaAs Quantum Dot Heterostructures for 3–5 µm IR Detectors
A. V. Antonov, D. M. Gaponova, V. M. Danil'tsev, M. N. Drozdov, L. D. Moldavskaya, A. V. Murel', V. S. Tulovchikov, and V. I. Shashkin
pp. 86-88 Full Text: PDF (48 kB)
Study of the Photoelectric Properties of Ge Quantum Dots in a ZnSe Matrix on GaAs
I. G. Neizvestny, S. P. Suprun, and V. N. Shumsky
pp. 89-94 Full Text: PDF (80 kB)
Unusual Persistent Photoconductivity in the InAs/AlSb Quantum Well
Yu. G. Sadofyev, A. Ramamoorthy, J. P. Bird, S. R. Johnson, and Y.-H. Zhang
pp. 95-99 Full Text: PDF (66 kB)
Special Features of Structural Interaction in (AlGaIn)N/GaN Heterostructures Used as Dislocation Filters
I. P. Soshnikov, N. N. Ledentsov, A. F. Tsatsul'nikov, A. V. Sakharov, W. V. Lundin, E. A. Zavarin, A. V. Fomin, D. Litvinov, E. Hahn, and D. Gerthsen
pp. 100-102 Full Text: PDF (160 kB)
Lateral Photoconductivity of AlGaAs/InGaAs Structures with Quantum Wells and Self-Organized Quantum Dots Under Interband Illumination
O. A. Shegai, A. K. Bakarov, A. K. Kalagin, and A. I. Toropov
pp. 103-106 Full Text: PDF (56 kB)
Spin Effects in Magnetoresistance Induced in an n-InxGa1 – xAs/GaAs Double Quantum Well by a Parallel Magnetic Field
M. V. Yakunin, G. A. Al'shanskii, Yu. G. Arapov, V. N. Neverov, G. I. Kharus, N. G. Shelushinina, B. N. Zvonkov, E. A. Uskova, A. de Visser, and L. Ponomarenko
pp. 107-112 Full Text: PDF (80 kB)
Terahertz Oscillator Based on Nonlinear Frequency Conversion in a Double Vertical Cavity
Yu. A. Morozov, I. S. Nefedov, V. Ya. Aleshkin, and I. V. Krasnikova
pp. 113-118 Full Text: PDF (83 kB)
Localization of Holes in an InAs/GaAs Quantum-Dot Molecule
M. M. Sobolev, G. E. Cirlin, Yu. B. Samsonenko, N. K. Polyakov, A. A. Tonkikh, and Yu. G. Musikhin
pp. 119-123 Full Text: PDF (89 kB)
AMORPHOUS, VITREOUS, AND POROUS SEMICONDUCTORS
The Engineering and Properties of InAs Quantum Dot Molecules in a GaAs Matrix
Yu. B. Samsonenko, G. E. Cirlin, A. A. Tonkikh, N. K. Polyakov, N. V. Kryzhanovskaya, V. M. Ustinov, L. E. Vorob'ev, D. A. Firsov, V. A. Shalygin, N. D. Zakharov, P. Werner, and A. Andreev
pp. 124-126 Full Text: PDF (108 kB)
Resonant Raman Scattering and Atomic Force Microscopy of InGaAs/GaAs Multilayer Nanostructures with Quantum Dots
M. Ya. Valakh, V. V. Strelchuk, A. F. Kolomys, Yu. I. Mazur, Z. M. Wang, M. Xiao, and G. J. Salamo
pp. 127-131 Full Text: PDF (176 kB)
Photoluminescence and the Raman Scattering in Porous GaSb Produced by Ion Implantation
Yu. A. Danilov, A. A. Biryukov, J. L. Gonçalves, J. W. Swart, F. Iikawa, and O. Teschke
pp. 132-135 Full Text: PDF (109 kB)
Efficiency of Avalanche Light-Emitting Diodes Based on Porous Silicon
S. K. Lazarouk, A. A. Leshok, V. A. Labunov, and V. E. Borisenko
pp. 136-138 Full Text: PDF (52 kB)
PHYSICS OF SEMICONDUCTOR DEVICES
Observation of the Middle-Infrared Emission from Semiconductor Lasers Generating Two Frequency Lines in the Near-Infrared Region of the Spectrum
V. Ya. Aleshkin, V. I. Gavrilenko, S. V. Morozov, K. V. Marem'yanin, B. N. Zvonkov, and S. M. Nekorkin
pp. 139-141 Full Text: PDF (53 kB)
The Resonant Terahertz Response of a Slot Diode with a Two-Dimensional Electron Channel
V. V. Popov, G. M. Tsymbalov, M. S. Shur, and W. Knap
pp. 142-146 Full Text: PDF (61 kB)
Bloch Oscillations in Superlattices: The Problem of a Terahertz Oscillator
Yu. A. Romanov and Yu. Yu. Romanova
pp. 147-155 Full Text: PDF (111 kB)
The Mode Competition, Instability, and Second Harmonic Generation in Dual-Frequency InGaAs/GaAs/InGaP Lasers
V. Ya. Aleshkin, B. N. Zvonkov, S. M. Nekorkin, and Vl. V. Kocharovsky
pp. 156-159 Full Text: PDF (59 kB)Archived web conten
Processing embodied conversation for interactive task learning
No full textLifelong learning is a long-standing goal of human-robot interaction. One approach to achieving this is through Interactive Task Learning (ITL) scenarios, in which the learner uses natural interaction with a user, acting as a teacher, to learn new tasks. One type of natural interaction is embodied conversation, initiated by an instruction such as “move the one red cube in front of a blue cylinder”. A key challenge for ITL is that the learner’s domain conceptualization may entirely lack the concepts necessary for solving the task. In other words, the teacher’s natural language expressions are neologisms to the learner (“red” or “cube”, say, in our example) that may denote concepts that are not a part of the learner’s conceptualization of the domain at all. To handle such un-foreseen possibilities, the learner must perform interactive symbol grounding: that is, they must expand their hypothesis space of possible states to include newly discovered concepts and learn in real-time how to recognize objects denoted by this unforeseen concept to successfully solve the task, using the teacher’s messages as evidence.
This thesis studies three ways in which the formal semantic analysis of embodied conversation can aid ITL. Firstly, we study how processing referential expressions like “the one red cube” with their logical consequences (e.g. that there is exactly one red cube in the environment) aids interactive symbol grounding. Secondly, we look into designing dialogue strategies under unawareness by quantifying the value of asking questions which require the teacher’s effort vs. risking solving tasks with current beliefs, which will be costly if wrong. Our unique contribution is that our learning models cope with an ever-expanding hypothesis space of possible states and actions that arise in ITL. Finally, we consider corrections of the agent’s execution actions, which arise when the ITL agent attempts to solve the task but performs a sub-optimal action in the environment (e.g., picking a red cylinder rather than a red cube), exposing its false beliefs and so prompting the teacher to express the source of the error (e.g., “No, this is a cylinder”). Such corrective feedback triggers belief revision, which, by exploiting the semantic consequences of the fact that it’s a correction (in this case, that the picked object is not a cube), complements and further improves the learning process.
We study these three facets by developing and evaluating neuro-symbolic methods for interactive symbol grounding and policy learning. Through our experiments, we conclude that agents who use formal semantic analysis when processing embodied conversation, outperform learners lacking these capabilities
Ferroelectrically Gated Atomically Thin Transition-Metal Dichalcogenides as Nonvolatile Memory
No full textFerroelectrically driven nonvolatile memory is demonstrated by interfacing 2D semiconductors and ferroelectric thin films, exhibiting superior memory performance comparable to existing thin-film ferroelectric field-effect transistors. An optical memory effect is also observed with large modulation of photoluminescence tuned by the ferroelectric gating, potentially finding applications in optoelectronics and valleytronics
A digital procedure for finding all directed subgraphs of a signal flow graph
No full textThe algebra of flow graphs is well defined and several techniques are available for obtaining input-output relations. A brief review is presented with the addition of the application to sampled data systems. However, all of the techniques for obtaining input-output relations depend upon the users ability to identify all subgraphs within his system flow graph. Several papers have been presented concerning error free identification of these loops and paths, however, the techniques involved are usually laborious and lengthy. Through the use of the connection matrix approach of Mr. C. V. Ramamoorthy a digitial computer program is developed that finds all loops and paths that exist within a flow graph. This research was restricted to only continuous variable systems, however, techniques are suggested for handling the hybrid case, containing discrete as well as continuous variables. Several examples are preseneted to demonstrate the capability of the program. Suggestions are also made for handling multi-input-output problems.Electrical and Computer Engineering, Department o
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