78,798 research outputs found
A comparative analysis of the value of information in a continuous time market model with partial information: the cases of log-utility and CRRA
We study the question what value an agent in a generalized Black-Scholes model with partial information attributes to the complementary information. To do this, we study the utility maximization problems from terminal wealth for the two cases partial information and full information. We assume that the drift term of the risky asset is a dynamic process of general linear type and that the two levels of observation correspond to whether this drift term is observable or not. Applying methods from stochastic filtering theory we derive an analytical tractable formula for the value of information in the case of logarithmic utility. For the case of constant relative risk aversion (CRRA) we derive a semianalytical formula, which uses as an input the numerical solution of a system of ODEs. For both cases we present a comparative analysis
Memristor-based Random Access Memory: The delayed switching effect could revolutionize memory design
Memristorâs on/off resistance can naturally store binary bits for non-volatile memories. In this work, we found that memristorâs another peculiar feature that the switching takes place with a time delay (we name it âthe delayed switchingâ) can be used to selectively address any desired memory cell in a crossbar array. The analysis shows this is a must-be in a memristor with a piecewise-linear ?-q curve. A âcircuit modelâ-based experiment has verified the delayed switching feature. It is demonstrated that memristors can be packed at least twice as densely as semiconductors, achieving a significant breakthrough in storage density
Nanosecond Dynamics of Single-Molecule Fluorescence Resonance Energy Transfer
Motivated by recent experiments on photon statistics from individual dye
pairs planted on biomolecules and coupled by fluorescence resonance energy
transfer (FRET), we show here that the FRET dynamics can be modelled by
Gaussian random processes with colored noise. Using Monte-Carlo numerical
simulations, the photon intensity correlations from the FRET pairs are
calculated, and are turned out to be very close to those observed in
experiment. The proposed stochastic description of FRET is consistent with
existing theories for microscopic dynamics of the biomolecule that carries the
FRET coupled dye pairs.Comment: 8 pages, 1 figure. accepted to J.Phys.Chem.
Micro-device for coupling, multiplexing and demultiplexing using elliptical-core two-mode fiber
We propose and demonstrate experimentally a fiber optic micro-device that is capable of tunably splitting, multiplexing, and demultiplexing optical signals using elliptical-core two-mode optical fiber. A crosstalk of 15 dB with an insertion loss of 1.2 dB was obtained
Analysis of electromagnetic interference from power system processing and transmission components for Space Station Freedom
The goal is to analyze the potential effects of electromagnetic interference (EMI) originating from power system processing and transmission components for Space Station Freedom.The approach consists of four steps: (1) develop analytical tools (models and computer programs); (2) conduct parameterization studies; (3) predict the global space station EMI environment; and (4) provide a basis for modification of EMI standards
Neural Wireframe Renderer: Learning Wireframe to Image Translations
In architecture and computer-aided design, wireframes (i.e., line-based
models) are widely used as basic 3D models for design evaluation and fast
design iterations. However, unlike a full design file, a wireframe model lacks
critical information, such as detailed shape, texture, and materials, needed by
a conventional renderer to produce 2D renderings of the objects or scenes. In
this paper, we bridge the information gap by generating photo-realistic
rendering of indoor scenes from wireframe models in an image translation
framework. While existing image synthesis methods can generate visually
pleasing images for common objects such as faces and birds, these methods do
not explicitly model and preserve essential structural constraints in a
wireframe model, such as junctions, parallel lines, and planar surfaces. To
this end, we propose a novel model based on a structure-appearance joint
representation learned from both images and wireframes. In our model,
structural constraints are explicitly enforced by learning a joint
representation in a shared encoder network that must support the generation of
both images and wireframes. Experiments on a wireframe-scene dataset show that
our wireframe-to-image translation model significantly outperforms the
state-of-the-art methods in both visual quality and structural integrity of
generated images.Comment: ECCV 202
Discriminative Region Proposal Adversarial Networks for High-Quality Image-to-Image Translation
Image-to-image translation has been made much progress with embracing
Generative Adversarial Networks (GANs). However, it's still very challenging
for translation tasks that require high quality, especially at high-resolution
and photorealism. In this paper, we present Discriminative Region Proposal
Adversarial Networks (DRPAN) for high-quality image-to-image translation. We
decompose the procedure of image-to-image translation task into three iterated
steps, first is to generate an image with global structure but some local
artifacts (via GAN), second is using our DRPnet to propose the most fake region
from the generated image, and third is to implement "image inpainting" on the
most fake region for more realistic result through a reviser, so that the
system (DRPAN) can be gradually optimized to synthesize images with more
attention on the most artifact local part. Experiments on a variety of
image-to-image translation tasks and datasets validate that our method
outperforms state-of-the-arts for producing high-quality translation results in
terms of both human perceptual studies and automatic quantitative measures.Comment: ECCV 201
Audio Event Detection using Weakly Labeled Data
Acoustic event detection is essential for content analysis and description of
multimedia recordings. The majority of current literature on the topic learns
the detectors through fully-supervised techniques employing strongly labeled
data. However, the labels available for majority of multimedia data are
generally weak and do not provide sufficient detail for such methods to be
employed. In this paper we propose a framework for learning acoustic event
detectors using only weakly labeled data. We first show that audio event
detection using weak labels can be formulated as an Multiple Instance Learning
problem. We then suggest two frameworks for solving multiple-instance learning,
one based on support vector machines, and the other on neural networks. The
proposed methods can help in removing the time consuming and expensive process
of manually annotating data to facilitate fully supervised learning. Moreover,
it can not only detect events in a recording but can also provide temporal
locations of events in the recording. This helps in obtaining a complete
description of the recording and is notable since temporal information was
never known in the first place in weakly labeled data.Comment: ACM Multimedia 201
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