169 research outputs found
Analysis of Supply Factors of the Migrant Workers Based on Comprehensive Fuzzy Evaluation
The factors affecting the supply of the migrant workers are very complex, which is difficult to use a specific number to demonstrate due to factors such as different groups of people, different time and different degrees of effect. This paper adopts the comprehensive fuzzy evaluation method to simulate the main factors affecting the supply of migrant workers including income, cost, expectancy, having a quantitative analysis of their influence on the labor supply of migrant workers. Key words: Comprehensive fuzzy evaluation; Migrant workers; Supply; Factors analysis Résumé: Les facteurs affectant la fourniture des travailleurs migrants sont très complexes, ce qui est difficile à utiliser c’est de démonter un nombre spécifique en raison de facteurs tels que les différents groupes de personnes, de temps différents et les différents degrés d'effet. Ce document adopte la méthode d'évaluation globale floue pour simuler les principaux facteurs affectant l'offre de travailleurs migrants dont le revenu, le coût, l'espérance, ayant une analyse quantitative de leur influence sur l'offre de travail des travailleurs migrants Mots-clés: L’évaluation floue complète; Les travailleurs migrants; L’approvisionnement; L'analyse des facteur
Adaptive supervisory switching control system design for active noise suppression of duct-like application
Active noise suppression for applications where the controlled system response varies with time is a difficult problem, especially for time varying nonlinear systems with large model error. On the basis of adaptive switching supervisory control theory, an adaptive supervisory switching control algorithm is proposed with a new controller switching strategy for active noise suppression of duct-like application. Real time experimental verification tests show that the proposed algorithm is effective with good noise suppression performance
DWSI: AN APPROACH TO SOLVING THE POLYGON INTERSECTION-SPREADING PROBLEM WITH A PARALLEL UNION ALGORITHM AT THE FEATURE LAYER LEVEL
A dual-way seeds indexing (DWSI) method based on R-tree and the OpenGeospatial Consortium (OGC) simple feature model was proposed to solve the polygon intersection-spreading problem. The parallel polygon union algorithm based on the improved DWSI and the OpenMP parallel programming model was developed to validate the usability of the data partition method. The experimental results reveal that the improved DWSI method can implement a robust parallel task partition by overcoming the polygon intersection-spreading problem. The parallel union algorithm applied DWSI not only scaled up the data processing but alsospeeded up the computation compared with the serial proposal, and it showed ahigher computational efficiency with higher speedup benchmarks in the treatment of larger-scale dataset. Therefore, the improved DWSI can be a potential approach to parallelizing the vector data overlay algorithms based on the OGC simple data model at the feature layer level
Can We `Feel' the Temperature of Knowledge? Modelling Scientific Popularity Dynamics via Thermodynamics
Just like everything in the nature, scientific topics flourish and perish.
While existing literature well captures article's life-cycle via citation
patterns, little is known about how scientific popularity and impact evolves
for a specific topic. It would be most intuitive if we could `feel' topic's
activity just as we perceive the weather by temperature. Here, we conceive
knowledge temperature to quantify topic overall popularity and impact through
citation network dynamics. Knowledge temperature includes 2 parts. One part
depicts lasting impact by assessing knowledge accumulation with an analogy
between topic evolution and isobaric expansion. The other part gauges temporal
changes in knowledge structure, an embodiment of short-term popularity, through
the rate of entropy change with internal energy, 2 thermodynamic variables
approximated via node degree and edge number. Our analysis of representative
topics with size ranging from 1000 to over 30000 articles reveals that the key
to flourishing is topics' ability in accumulating useful information for future
knowledge generation. Topics particularly experience temperature surges when
their knowledge structure is altered by influential articles. The spike is
especially obvious when there appears a single non-trivial novel research focus
or merging in topic structure. Overall, knowledge temperature manifests topics'
distinct evolutionary cycles
DWSI: AN APPROACH TO SOLVING THE POLYGON INTERSECTION-SPREADING PROBLEM WITH A PARALLEL UNION ALGORITHM AT THE FEATURE LAYER LEVEL
A dual-way seeds indexing (DWSI) method based on R-tree and the OpenGeospatial Consortium (OGC) simple feature model was proposed to solve the polygon intersection-spreading problem. The parallel polygon union algorithm based on the improved DWSI and the OpenMP parallel programming model was developed to validate the usability of the data partition method. The experimental results reveal that the improved DWSI method can implement a robust parallel task partition by overcoming the polygon intersection-spreading problem. The parallel union algorithm applied DWSI not only scaled up the data processing but alsospeeded up the computation compared with the serial proposal, and it showed ahigher computational efficiency with higher speedup benchmarks in the treatment of larger-scale dataset. Therefore, the improved DWSI can be a potential approach to parallelizing the vector data overlay algorithms based on the OGC simple data model at the feature layer level
Exploring the Limits of Historical Information for Temporal Knowledge Graph Extrapolation
Temporal knowledge graphs, representing the dynamic relationships and
interactions between entities over time, have been identified as a promising
approach for event forecasting. However, a limitation of most temporal
knowledge graph reasoning methods is their heavy reliance on the recurrence or
periodicity of events, which brings challenges to inferring future events
related to entities that lack historical interaction. In fact, the current
state of affairs is often the result of a combination of historical information
and underlying factors that are not directly observable. To this end, we
investigate the limits of historical information for temporal knowledge graph
extrapolation and propose a new event forecasting model called Contrastive
Event Network (CENET) based on a novel training framework of historical
contrastive learning. CENET learns both the historical and non-historical
dependency to distinguish the most potential entities that best match the given
query. Simultaneously, by launching contrastive learning, it trains
representations of queries to probe whether the current moment is more
dependent on historical or non-historical events. These representations further
help train a binary classifier, whose output is a boolean mask, indicating the
related entities in the search space. During the inference process, CENET
employs a mask-based strategy to generate the final results. We evaluate our
proposed model on five benchmark graphs. The results demonstrate that CENET
significantly outperforms all existing methods in most metrics, achieving at
least 8.3% relative improvement of Hits@1 over previous state-of-the-art
baselines on event-based datasets.Comment: Extended version of AAAI paper arXiv:2211.1090
Exploring and Verbalizing Academic Ideas by Concept Co-occurrence
Researchers usually come up with new ideas only after thoroughly
comprehending vast quantities of literature. The difficulty of this procedure
is exacerbated by the fact that the number of academic publications is growing
exponentially. In this study, we devise a framework based on concept
co-occurrence for academic idea inspiration, which has been integrated into a
research assistant system. From our perspective, the fusion of two concepts
that co-occur in an academic paper can be regarded as an important way of the
emergence of a new idea. We construct evolving concept graphs according to the
co-occurrence relationship of concepts from 20 disciplines or topics. Then we
design a temporal link prediction method based on masked language model to
explore potential connections between different concepts. To verbalize the
newly discovered connections, we also utilize the pretrained language model to
generate a description of an idea based on a new data structure called
co-occurrence citation quintuple. We evaluate our proposed system using both
automatic metrics and human assessment. The results demonstrate that our system
has broad prospects and can assist researchers in expediting the process of
discovering new ideas.Comment: Accepted by ACL 202
Automatic mapping aquaculture in coastal zone from TM imagery with OBIA approach
IEEE GRSS; The Geographical Society of China<span class="MedBlackText">Aquaculture area monitoring is of great importance for coastal zone sustainable management and planning. This paper focuses on the development and assessment of an automatic approach for aquaculture mapping in coastal zone from TM imagery. The contribution mainly consists of three aspects: first, utilizes the Multi-scale segmentation/object relationship modeling (MSS/ORM) strategy on the object based image analysis (OBIA) of TM imagery; second, evaluates the effectiveness GLCM homogeneity texture feature on pond aquaculture area information extraction; third, compares the analysis results from three different approaches, namely pixelbased maximum likelihood classifier (MLC), One-step supervised OBIA with stand nearest neighbor (SNN) and MSS/ORM OBIA strategy. The final result shows that the MSS/ORM OBIA approach greatly improves the classification accuracy and has good potential for automatic pond aquaculture land mapping in coastal zone from TM imagery.</span
Accelerating Spatial Clustering Detection of Epidemic Disease with Graphics Processing Unit
IEEE GRSS; The Geographical Society of China<span class="MedBlackText">The statistics of disease clustering is of interest to epidemiologists. In order to detect spatial clustering of disease in all the regions of China, we adopted a likelihood ratio based method which utilizes Monte Carlo simulation and spatial exploring to analyze the real time updating data stored in database. However, large number of random tests for Monte Carlo simulation and large scale of the data set had made the speed of analysis too slow to detect and monitor potential public health hazards. Therefore, we explored to adopt graphics processing unit (GPU) and compute unified device architecture (CUDA) to accelerate the spatial exploring and analyzing process. The algorithm has been implemented efficiently on GPU and the access pattern to memory has been optimized to exploit the computing power of GPU. As a result, the GPU based spatial exploring and likelihood ratio test program performed more than forty times faster then the CPU implementation. The Monte Carlo simulation on GPU performed around thirty times faster than the counter part on CPU. By using GPU and CUDA, the usage of our application is changed from verification after the event to early warning.</span
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