401 research outputs found
Adaptive and Robust Fault-Tolerant Tracking Control of Contact force of Pantograph-Catenary for High-Speed Trains
Abstract This paper presents a modified multi-body dynamic model and a linear time-invariant model with actuator faults (loss of effectiveness faults, bias faults) and matched and unmatched uncertainties. Based on the fault model, a class of adaptive and robust tracking controllers are proposed which are adjusted online to tolerate the time-varying loss of effectiveness faults and bias faults, and compensate matched disturbances without the knowledge of bounds. For unmatched uncertainties, optimal control theory is added to the controller design processes. Simulations on a pantograph are shown to verify the efficiency of the proposed fault-tolerant design approach
When Mobile Blockchain Meets Edge Computing
Blockchain, as the backbone technology of the current popular Bitcoin digital
currency, has become a promising decentralized data management framework.
Although blockchain has been widely adopted in many applications, e.g.,
finance, healthcare, and logistics, its application in mobile services is still
limited. This is due to the fact that blockchain users need to solve preset
proof-of-work puzzles to add new data, i.e., a block, to the blockchain.
Solving the proof-of-work, however, consumes substantial resources in terms of
CPU time and energy, which is not suitable for resource-limited mobile devices.
To facilitate blockchain applications in future mobile Internet of Things
systems, multiple access mobile edge computing appears to be an auspicious
solution to solve the proof-of-work puzzles for mobile users. We first
introduce a novel concept of edge computing for mobile blockchain. Then, we
introduce an economic approach for edge computing resource management.
Moreover, a prototype of mobile edge computing enabled blockchain systems is
presented with experimental results to justify the proposed concept.Comment: Accepted by IEEE Communications Magazin
Competition and Cooperation Analysis for Data Sponsored Market: A Network Effects Model
The data sponsored scheme allows the content provider to cover parts of the
cellular data costs for mobile users. Thus the content service becomes
appealing to more users and potentially generates more profit gain to the
content provider. In this paper, we consider a sponsored data market with a
monopoly network service provider, a single content provider, and multiple
users. In particular, we model the interactions of three entities as a
two-stage Stackelberg game, where the service provider and content provider act
as the leaders determining the pricing and sponsoring strategies, respectively,
in the first stage, and the users act as the followers deciding on their data
demand in the second stage. We investigate the mutual interaction of the
service provider and content provider in two cases: (i) competitive case, where
the content provider and service provider optimize their strategies separately
and competitively, each aiming at maximizing the profit and revenue,
respectively; and (ii) cooperative case, where the two providers jointly
optimize their strategies, with the purpose of maximizing their aggregate
profits. We analyze the sub-game perfect equilibrium in both cases. Via
extensive simulations, we demonstrate that the network effects significantly
improve the payoff of three entities in this market, i.e., utilities of users,
the profit of content provider and the revenue of service provider. In
addition, it is revealed that the cooperation between the two providers is the
best choice for all three entities.Comment: 7 pages, submitted to one conferenc
Reflexões sobre a tradução jurídica português-chinês: a tradução do Código Civil de Macau sob a influência de factores sociais
A tradução jurídica chinês-português desempenha um papel crítico no processo de
aprofundamento e expansão do uso comum do chinês juntamente com o do português
em Macau e em intercâmbios e comunicações entre a China e os países lusófonos.
Esta dissertação visa analisar as influências de factores sociais na tradução jurídica
de Macau e explorar as estratégias para lidar com elas. Para este efeito, é examinado
em especial o Código Civil de Macau como objecto de investigação. O Código Civil
de Macau é, por um lado, uma declaração de protecção dos legítimos direitos e
interesses das pessoas, estando intimamente relacionado com as pessoas na sociedade,
e, por outro, estabelece as normas de comportamento e cumprimento básico para
diversas actividades civis dos sujeitos civis. Através da comparação e análise crítica
da actual versão bilingue do Código Civil de Macau, a dissertação estuda vários
factores sociais, nomeadamente políticos e relativos ao ambiente linguístico e a
perspectiva de pensamento moldada por cultura, que afectam as decisões tomadas
durante a tradução jurídica, assim como as teorias, métodos e estratégias de tradução
aplicadas, a fim de lidar com os problemas suscitados.
Por meio da análise acima mencionada, chega-se à conclusão de que, no processo
de tradução jurídica, os factores sociais são de grande relevância para a tradução, o
que se reflecte principalmente na escolha de palavras e terminologia na língua de
chegada e na forma de construção de frases. Nesse processo, além de se explorar a
conversão equivalente ao nível das palavras e das frases, é feita uma análise sobre a
intenção legislativa e os efeitos jurídicos que a tradução correspondente pode
produzir.
No final desta dissertação, com base nas características especiais formada em
Macau durante o processo de tradução jurídica, explora-se os métodos e as estratégias
mais adequadas para a tradução jurídica português-chinês.Portuguese-Chinese legal translation plays a critical role in the process of
deepening and expanding the common use of Chinese together with that of
Portuguese in Macau and in interchanges and communications between China and
Portuguese-speaking countries.
This dissertation aims to analyze the influence of social factors in the legal
translation of Macao and to explore the strategies to deal with them. For this purpose,
the Civil Code of Macau is studied. The Civil Code of Macau, on the one hand, is a
declaration of protection of the legitimate rights and interests of people, being closely
related to people in society, and, on the other, it establishes the rules of behavior and
basic compliance for various civil activities of the civilian subjects. Through the
comparison and critical analysis of the current bilingual versions of the Civil Code of
Macau, this dissertation studies several social factors, namely political and related to
the linguistic environment and the perspective of thinking shaped by culture, which
affect decisions taken during the process of legal translation, as well as the theories,
methods and translation strategies applied in order to deal with the problems raised.
Through the aforementioned analysis, it is concluded that, in the process of legal
translation, social factors are of great relevance to the translation, which is mainly
reflected in the choice of words and terminology in the language of arrival and in the
form of sentence construction. In this process, in addition to an exploration of the
equivalent conversion at the level of words and phrases, an analysis is carried out
about the intention and the legal effects which the corresponding translation can
produce.
At the end of this dissertation, based on the special characteristics formed in Macau
during the legal translation process, appropriate methods and strategies for
Portuguese-Chinese legal translation are explored
FPTN: Fast Pure Transformer Network for Traffic Flow Forecasting
Traffic flow forecasting is challenging due to the intricate spatio-temporal
correlations in traffic flow data. Existing Transformer-based methods usually
treat traffic flow forecasting as multivariate time series (MTS) forecasting.
However, too many sensors can cause a vector with a dimension greater than 800,
which is difficult to process without information loss. In addition, these
methods design complex mechanisms to capture spatial dependencies in MTS,
resulting in slow forecasting speed. To solve the abovementioned problems, we
propose a Fast Pure Transformer Network (FPTN) in this paper. First, the
traffic flow data are divided into sequences along the sensor dimension instead
of the time dimension. Then, to adequately represent complex spatio-temporal
correlations, Three types of embeddings are proposed for projecting these
vectors into a suitable vector space. After that, to capture the complex
spatio-temporal correlations simultaneously in these vectors, we utilize
Transformer encoder and stack it with several layers. Extensive experiments are
conducted with 4 real-world datasets and 13 baselines, which demonstrate that
FPTN outperforms the state-of-the-art on two metrics. Meanwhile, the
computational time of FPTN spent is less than a quarter of other
state-of-the-art Transformer-based models spent, and the requirements for
computing resources are significantly reduced
- …