53,759 research outputs found
Graph-Segmenter: Graph Transformer with Boundary-aware Attention for Semantic Segmentation
The transformer-based semantic segmentation approaches, which divide the
image into different regions by sliding windows and model the relation inside
each window, have achieved outstanding success. However, since the relation
modeling between windows was not the primary emphasis of previous work, it was
not fully utilized. To address this issue, we propose a Graph-Segmenter,
including a Graph Transformer and a Boundary-aware Attention module, which is
an effective network for simultaneously modeling the more profound relation
between windows in a global view and various pixels inside each window as a
local one, and for substantial low-cost boundary adjustment. Specifically, we
treat every window and pixel inside the window as nodes to construct graphs for
both views and devise the Graph Transformer. The introduced boundary-aware
attention module optimizes the edge information of the target objects by
modeling the relationship between the pixel on the object's edge. Extensive
experiments on three widely used semantic segmentation datasets (Cityscapes,
ADE-20k and PASCAL Context) demonstrate that our proposed network, a Graph
Transformer with Boundary-aware Attention, can achieve state-of-the-art
segmentation performance
Learning Multi-Level Information for Dialogue Response Selection by Highway Recurrent Transformer
With the increasing research interest in dialogue response generation, there
is an emerging branch formulating this task as selecting next sentences, where
given the partial dialogue contexts, the goal is to determine the most probable
next sentence. Following the recent success of the Transformer model, this
paper proposes (1) a new variant of attention mechanism based on multi-head
attention, called highway attention, and (2) a recurrent model based on
transformer and the proposed highway attention, so-called Highway Recurrent
Transformer. Experiments on the response selection task in the seventh Dialog
System Technology Challenge (DSTC7) show the capability of the proposed model
of modeling both utterance-level and dialogue-level information; the
effectiveness of each module is further analyzed as well
Network algebra for synchronous dataflow
We develop an algebraic theory of synchronous dataflow networks. First, a
basic algebraic theory of networks, called BNA (Basic Network Algebra), is
introduced. This theory captures the basic algebraic properties of networks.
For synchronous dataflow networks, it is subsequently extended with additional
constants for the branching connections that occur between the cells of
synchronous dataflow networks and axioms for these additional constants. We
also give two models of the resulting theory, the one based on stream
transformers and the other based on processes as considered in process algebra.Comment: 24 page
Safety issues in PV systems: design choices for a secure fault detection and for preventing fire risk
Photovoltaic systems have played a key role over the last decade in the evolution of the electricity sector. In terms of safety design, it's important to consider that a PV plant constitutes a special system of generation, where the Direct Current (DC) presence results in changes to the technical rules. Moreover, if certain electrical faults occur, the plant is a possible source of fire. Choices regarding the grounding of the generator and its protection devices are fundamental for a design that evaluates fire risk. The subject of the article is the analysis of the relation between electrical phenomena in PV systems and the fire risk related to ensuring appropriate fault detection by the electrical protection system. A description of a grid-connected PV system is followed firstly by a comparison of the design solutions provided by international Standards, and secondly by an analysis of electrical phenomena which may trigger a fire. A study of two existing PV systems, where electrical faults have resulted in fires, is then presented. The study highlights the importance of checking all possible failure modes in a PV system design phase, to assess fire risk in advance. Some guidelines for the mitigation of electrical faults that may result in a fire are finally provided
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