检索结果-内蒙古大学图书馆

Efficiency assessment of wind farms: A two-stage approach

AIP Conference Proceedings 2015年第1期1648卷

作者： C. B. Vaz A. P. Ferreira *Polytechnic Institute of Bragança Campus de Santa Apolónia Apartado 1134 5301-857 Portugal clvaz@ipb.pt CGEI Centre for Management and Industrial Engineering INESC TEC †Polytechnic Institute of Bragança Campus de Santa Apolónia Apartado 1134 5301-857 Portugal apf@ipb.pt CISE Electromechatronic Systems Research Center University of Beira Interior

This study proposes an integrated methodology to provide insights regarding the efficiency of wind farms of two major promoters in the Portuguese energy sector. The focus of the wind farms performance assessment is on the operating stage which corresponds to the electrical energy production process. In a first stage, Data Envelopment Analysis is used to measure the efficiency of wind farms in producing electrical energy from the resources available and exogenous variables. This method is complemented by bootstrapping to refine the efficiency estimates. In a second stage, the factors which may influence the performance of wind farms are investigated by using truncated regression with bootstrapping. The methodology proposed may be used by promoters in management of wind farms and may also be useful to regulator agents on the supervision of the energy market.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Development of an Unmanned Capsule for large-scale maritime search and rescue

Development of an Unmanned Capsule for large-scale maritime ...

引用

OCEANS

作者： Aníbal Matos Eduardo Silva Nuno Cruz José Carlos Alves Duarte Almeida Miguel Pinto Alfredo Martins José Almeida Diogo Machado INESC TEC-Institute for Systems and Computer Engineering of Porto

ISBN: (纸本)9781479913084

This paper describes the development and testing of a robotic capsule for search and rescue operations at sea. This capsule is able to operate autonomously or remotely controlled, is transported and deployed by a larger USV into a determined disaster area and is used to carry a life raft and inflate it close to survivors in large-scale maritime disasters. The ultimate goal of this development is to endow search and rescue teams with tools that extend their operational capability in scenarios with adverse atmospheric or maritime conditions.

关键词： Robots Global Positioning System Springs Vehicles Sensors Batteries

来源：评论

学校读者我要写书评

暂无评论

On the Adequacy of Tabu Search for Global Robot Path Planning Problem in Grid Environments

引用

Procedia computer Science 2014年 32卷 604-613页

作者： Imen Châari Anis Koubâa Hachemi Bennaceur Adel Ammar Sahar Trigui Mohamed Tounsi Elhadi Shakshuki Habib Youssef University of Manouba ENSI Manouba Tunisia Cooperative Intelligent Networked Systems (COINS) Research Group Riadh Saudi Arabia Prince Sultan University College of Computer and Information Sciences Riadh Saudi Arabia CISTER/INESC-TEC ISEP Polytechnic Institute of Porto Porto Portugal Al-Imam Mohamed bin Saud University Research Unit of Sciences and Technology Riadh Saudi Arabia Acadia University Jodrey School of Computer Science Canada University of Sousse PRINCE Research Unit Sousse Tunisia

This paper investigates the capabilities of tabu search for solving the global path planning problem in grid maps. Accordingly, a tabu search system model is designed and a tabu search planner algorithm for solving the path planning problem is proposed. A comprehensive simulation study is conducted using the proposed model and algorithm, in terms of solution quality and execution time. A comparison between our results with those of A* and genetic algorithms (GA) is presented for small, medium and large-scale grid maps. Simulation results show that the tabu search planner is able to find the optimal solution for small scale environments. However, for large scale maps, it provides near-optimal solutions with small gap while ensuring shorter execution times as compared to the A* Algorithm. A discussion about the advantages and limitations of TS for solving a path planning problem is also presented.

关键词： Mobile robots Global path planning Tabu search.

来源：评论

学校读者我要写书评

暂无评论

Thermographic and visible spectrum camera calibration for marine robotic target detection

Thermographic and visible spectrum camera calibration for ma...

引用

OCEANS

作者： André Dias Carlos Brás Alfredo Martins José Almeida Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto Porto Polytechnic Institute Porto Portugal

ISBN: (纸本)9781479913084

In the context of detection, location and tracking of human targets with combination of thermographic and visible cameras, this paper addresses the problem of geometric calibration of thermographic and visible spectrum cameras necessary for the stereo perception of targets in the robot frame. A method for precise geometric calibration of thermographic and visible cameras in the autonomous surface vehicle (ASV) ROAZ II is presented. The method combine the utilization of special patterns for intrinsic calibration of thermographic cameras, with the usage of a high-resolution 3D laser scanner for the extrinsic calibration, relating the cameras frames with the robot frame. Calibration process results are presented and analyzed.

关键词： Cameras Calibration Robot vision systems Three-dimensional displays Vehicles Lasers

来源：评论

学校读者我要写书评

暂无评论

Groundtruth system for underwater benchmarking

Groundtruth system for underwater benchmarking

引用

OCEANS

作者： Alfredo Martins André Dias Hugo Silva José Almeida Pedro Gonçalves Flávio Lopes André Faria João Ribeiro Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto Porto Polytechnic Institute Porto Portugal

In this paper a vision based groundtruth system for underwater applications is presented. The proposed system as an external validation perception and localization mechanism for underwater trials in the inesc tec / IS... 详细信息

ISBN: (纸本)9781479913084

关键词： Cameras Vehicles Image color analysis Robots Synchronization Calibration Three-dimensional displays

来源：评论

学校读者我要写书评

暂无评论

Field experiments for marine casualty detection with autonomous surface vehicles

Field experiments for marine casualty detection with autonom...

引用

OCEANS

作者： Alfredo Martins André Dias José Almeida Hugo Ferreira Carlos Almeida Guilherme Amaral Diogo Machado João Sousa Pedro Pereira Aníbal Matos Vitor Lobo Eduardo Silva INESC TEC Institute for Systems and Computer Engineering of Porto CINAV Portuguese Navy Research Center Almada Portugal

ISBN: (纸本)9781479913084

In this paper we present a set of field tests for detection of human in the water with an unmanned surface vehicle using infrared and color cameras. These experiments aimed to contribute in the development of victim target tracking and obstacle avoidance for unmanned surface vehicles operating in marine search and rescue missions. This research is integrated in the work conducted in the European FP7 research project Icarus aiming to develop robotic tools for large scale rescue operations. The tests consisted in the use of the ROAZ unmanned surface vehicle equipped with a precision GPS system for localization and both visible spectrum and IR cameras to detect the target. In the experimental setup, the test human target was deployed in the water wearing a life vest and a diver suit (thus having lower temperature signature in the body except hands and head) and was equipped with a GPS logger. Multiple target approaches were performed in order to test the system with different sun incidence relative angles. The experimental setup, detection method and preliminary results from the field trials performed in the summer of 2013 in Sesimbra, Portugal and in La Spezia, Italy are also presented in this work.

关键词： Vehicles Cameras Image color analysis Robots Ocean temperature Object detection Sea surface

来源：评论

学校读者我要写书评

暂无评论

Collaborative projects involving industry and academia to enhance electrical engineering education: The perspective of three Portuguese Higher Education Institutions at the master degree level

Collaborative projects involving industry and academia to en...

引用

EAEEIE Annual Conference,

作者： Maria João Martins Fernando Lopes Inácio Fonseca C. Machado Ferreira F. Maciel Barbosa Academia Militar Lisboa Portugal Instituto de Telecomunicacoes-Polo de Coimbra Polo II da Universidade de Coimbra Coimbra Portugal Instituto Superior de Engenharia de Coimbra (IPC/ISEC) Coimbra Portugal Institute for Systems Engineering and Computers at Coimbra Coimbra Portugal Departamento de Engenharia Electrotecnica e de Computadores Faculdade de Engenharia da Universidade do Porto (FEUP) and INESC TEC Porto Portugal

In this paper, Electrical engineering Education at the Master level is presented through three perspectives of collaborative projects involving industry and academia. The presented perspectives originate from three Portuguese Higher Education Institutions representing the University, Military Academy and Polytechnic School viewpoints. Throughout the presented projects, an increasing student motivation was observed, driven by the practical experience provided through the industrial sector approach. This cooperation also generates opportunities to develop new perspectives and ideas for follow-on projects as well as innovative academic publications.

关键词： Decision support systems

来源：评论

学校读者我要写书评

暂无评论

Combining sparse and dense methods in 6D visual odometry

Combining sparse and dense methods in 6D visual odometry

引用

International Conference on Autonomous Robot systems

作者： Hugo Silva Eduardo Silva Alexandre Bernardino INESC TEC Robotics Unit School of Engineering Polytechnic Institute of Porto Institute of Systems and Robotics IST Lisbon Portugal

ISBN: (纸本)9781479912483

Visual Odometry is one of the most powerful, yet challenging, means of estimating robot ego-motion. By grounding perception to the static features in the environment, vision is able, in principle, to prevent the estimation bias rather common in other sensory modalities such as inertial measurement units or wheel odometers. We present a novel approach to ego-motion estimation of a mobile robot by using a 6D Visual Odometry Probabilistic Approach. Our approach exploits the complementarity of dense optical flow methods and sparse feature based methods to achieve 6D estimation of vehicle motion. A dense probabilistic method is used to robustly estimate the epipolar geometry between two consecutive stereo pairs;a sparse feature stereo approach to estimate feature depth;and an Absolute Orientation method like the Procrustes to estimate the global scale factor. We tested our proposed method on a known dataset and compared our 6D Visual Odometry Probabilistic Approach without filtering techniques against a implementation that uses the well known 5-point RANSAC algorithm. Moreover, comparison with an Inertial Measurement Unit (RTK-GPS) is also performed, for providing a more detailed evaluation of the method against ground-truth information.

关键词： information evaluation Procrustes

来源：评论

学校读者我要写书评

暂无评论

Multi-Robot Cooperative Stereo for Outdoor Scenarios

Multi-Robot Cooperative Stereo for Outdoor Scenarios

引用

International Conference on Autonomous Robot systems

作者： A. Dias J. Almeida E. Silva P. Lima INESC TEC Robotics Unit School of Engineering Polytechnic Institute of Porto Institute for Systems and Robotics Instituto Superior Técnico (IST) Lisbon Portugal

ISBN: (纸本)9781479912483

In this paper, we propose a cooperative perception framework for multi-robot real-time 3D high dynamic target estimation in outdoor scenarios based on monocular camera available on each robot. The relative position and orientation between robots establishes a flexible and dynamic stereo baseline. Overlap views subject to geometric constraints emerged from the stereo formulation, which allowed us to obtain a decentralized cooperative perception layer. Epipolar constraints related to the global frame are applied both in image feature matching and to feature searching and detection optimization in the image processing of robots with low computational capabilities. In contrast to classic stereo, the proposed framework considers all sources of uncertainty (in localization, attitude and image detection from both robots) in the determination of the objects best 3D localization and its uncertainty. The proposed framework can be later integrated in a decentralized data fusion (DDF) multi-target tracking approach where it can contribute to reduce rumor propagation data association and track initialization issues. We demonstrate the advantages of this approach in real outdoor scenario. This is done by comparing a stereo rigid baseline standalone target tracking with the proposed multi-robot cooperative stereo between a micro aerial vehicle (MAV) and an autonomous ground vehicle (AGV).

关键词： propagation association sources

来源：评论

学校读者我要写书评

暂无评论

Identifying combinatorial effects in requirements engineering

Lecture Notes in Business Information Processing

引用

Lecture Notes in Business Information Processing 2013年 LNBIP 146卷 88-102页

作者： Verelst, Jan Ferreira, David Almeida Mannaert, Herwig Silva, Alberto Rodrigues Huysmans, Philip Normalized Systems Institute Department of Management Information Systems University of Antwerp Antwerp Belgium Department of Computer Science and Engineering IST and INESC-ID Lisbon Portugal

ISBN: (纸本)9783642381164

There are several best practices and proposals that help to design and develop software systems immune (to some extent) to combinatorial effects as these systems evolve. Normalized systems theory, considered at the software architecture level, is one of such proposals. However, at the requirements engineering (RE)-level, little research has been done regarding this issue. This paper discusses examples related with this problem considering two distinct RE abstract levels, namely at the business and system levels. The examples provided follow the notations and techniques typical used to model the software system at such levels, namely DEMO/EO, BPMN, and UML (Use Cases and Class diagrams). The analysis of these examples suggests that combinatorial effects can be easily found at these different levels. This paper also proposes a research agenda to further investigate this matter in terms of the effects of combinatorial effects, and envisions the mechanisms and solutions for dealing with them. It is suggested that an artifact-based, domain-specific approach is best suited to achieve highly agile enterprises and RE-processes in the future. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Requirements engineering

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：