Time and Date: 13:35 - 15:15 on 11th June 2018
Chair: Kourosh Modarresi
| Optimal Control of Nonlinear Multi-Link Inverted Pendulum Systems using ANFIS Controller [abstract]
Abstract: Adaptive network-based fuzzy inference system (ANFIS), is a suitable technique for predicting the behavior of systems. In recent years, the capabilities of ANFIS in controlling nonlinear systems, has been studied by researchers. In this work, ability of ANFIS controller to stabilize the multi-link inverted pen-dulum-cart system is presented. The inverted pendulum on a cart system is a sys-tem with unstable and nonlinear behavior. Different types of inverted pendulum including single link inverted pendulum(SIP), double link inverted pendu-lum(DIP), triple link inverted pendulum(TIP) are subject of this paper. Training can be considered the most important and challenging part in design of ANFIS controller. To solve this problem, linear quadratic regulator(LQR) and linear model of inverted pendulum system are used, in a way that data including state variables are reduced to two variables, error and variation of error and are used for training of ANFIS. The most important section in designing of LQR is ap-propriate determination of Q and R matrices and consequently control gain matrix K so that it can meet the desired system characteristics such as settling time, over-shoot, …. The classic way for determination of these matrices, is trial and error approach that can be very time consuming and frustrating in some cases in addi-tion there is no guarantee to find the best possible solutions. To overcome this problem, Optimization algorithms have been used. Two Powerful optimization algorithms including genetic algorithm and particle swarm optimization algorithm are used and their results have been compared. In the end, the obtained results in MATLAB/SIMULINK environment show that the proposed ANFIS controller has an excellent ability to stabilize nonlinear multi-link inverted pendulum system in a very short time. The results associated with adding noise at the input of the system are provided in the final section of this paper which confirm that the pro-posed ANFIS controller is robust and effective.
| On Two Kinds of Dataset Decomposition [abstract]
Abstract: We consider a Cartesian decomposition of datasets, i.e. finding datasets such that their unordered Cartesian product yields the source set, and some natural generalization of this decomposition. In terms of relational databases, this means reversing the SQL CROSS JOIN and INNER JOIN operators (the last is equipped with a test verifying the equality of a table’s attribute to another table’s attribute). First we outline a polytime algorithm for computing the Cartesian decomposition. Then we describe a polytime algorithm for computing a generalized decomposition based on the Cartesian decomposition. Some applications and relating problems are discussed.
| A Graph-based Algorithm for Supervised Image Classification [abstract]
Abstract: Manifold learning is a main stream research track used for dimensionality reduction as a method to select features. Many variants have been proposed with good performance. In this paper, we present a novel graph-based supervised learning framework for image classification. It takes the advantage of graph embedding to improve the recognition accuracy. The proposed method is tested on four benchmark datasets of different types including scene, face and object. The experimental results demonstrate the effectiveness of the proposed algorithm by the comparison with other tested algorithms.
|Ke Du, Jinlong Liu, Xingrui Zhang, Jianying Feng, Yudong Guan and Stéphane Domas
| An Adversarial Training Framework for Relation Classification [abstract]
Abstract: Relation classification is one of the most important topics in Natural Language Processing (NLP) which could help mining structured facts from text and constructing knowledge graph. Although deep neural network models have achieved improved performance in this task, the state-of-the-art methods still suffer from the scarce training data and the overfitting problem. In order to solve this problem, we adopt the adversarial training framework to improve the robustness and generalization of the relation classifier. In this paper, we construct a bidirectional recurrent neural network as the relation classifier, and append word-level attention to the input sentence. Our model is an end-to-end framework without the use of any features derived from pre-trained NLP tools. In experiments, our model achieved higher F1-score and better robustness than comparative methods.
|Wenpeng Liu, Yanan Cao, Cong Cao, Yanbing Liu, Yue Hu and Li Guo
| Topic-Based Microblog Polarity Classification Based on Cascaded Model [abstract]
Abstract: Given a microblog post and a topic, it is an important task to judge the sentiment towards that topic: positive or negative, and has important theoretical and application value in the public opinion analysis, personalized recommendation, product comparison analysis, prevention of terrorist attacks, etc. Because of the short and irregular messages as well as containing multifarious features such as emoticons, and sentiment of a microblog post is closely related to its topic, most existing approaches cannot perfectly achieve cooperating analysis of topic and sentiment of messages, and even cannot know what factors actually determined the sentiment towards that topic. To address the issues, MB-LDA model and attention network are applied to Bi-RNN for topic-based microblog polarity classification. Our cascaded model has three distinctive characteristics: (i) a strong relationship between topic and its sentiment is considered; (ii) the factors that affect the topic’s sentiment are identified, and the degree of influence of each factor can be calculated; (iii) the synchronized detection of the topic and its sentiment in microblog is achieved. Extensive experiments show that our cascaded model outperforms state-of-the-art unsupervised approach JST and supervised approach SSA-ST significantly in terms of sentiment classification accuracy and F1-Measure.
|Quanchao Liu, Yue Hu, Yangfan Lei, Xiangpeng Wei and Wei Bi
| A novel pedestrian detection method based on combination of LBP, HOG, and Haar-like features [abstract]
Abstract: The existing pedestrian detection methods are still challenging under abrupt illumination, different human shape, and cluttered backgrounds. In this contribution, we suggest a novel method to handle the above detection failures. On account of the fact that the potential of features are different and a single feature cannot extract the comprehensive information and human appearance can be better acquired by combinations of efficacious features, we combine HOG, LBP, and Haar-like features. Thus, the proposed method contains the edge, texture information, and local shape information. It should be mentioned that there has not been a method based on combination of these three features yet. After feature combination, linear SVM classifier is used to detect pedestrian images from non-pedestrian. In experiments, INRIA dataset, Daimler dataset, and ETH dataset are adopted as the training and testing sets. Each dataset was recorded in various environments, resolution, and background occlusion. As a result, employing three various datasets can help not only further enrich our data but also scrutinize the robustness and precision of the proposed method in more depth. The substantial experimental result indicated that the proposed scheme outperformed the state of the art methods in terms of the accuracy with comparable computational time.
|Mina Etehadi Abari