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2020 11th International Conference on Information, Intelligence, Systems and Applications (IISA最新文献

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A Machine Learning workflow for Diagnosis of Knee Osteoarthritis with a focus on post-hoc explainability 膝骨关节炎诊断的机器学习工作流程,重点是事后可解释性
Christos Kokkotis, S. Moustakidis, E. Papageorgiou, G. Giakas, D. Tsaopoulos
Knee Osteoarthritis (KOA) is a multifactorial disease-causing joint pain, deformity and dysfunction. The aim of this paper is to provide a data mining approach that could identify important risk factors which contribute to the diagnosis of KOA and their impact on model output, with a focus on posthoc explainability. Data were obtained from the osteoarthritis initiative (OAI) database enrolling people, with nonsymptomatic KOA and symptomatic KOA or being at high risk of developing KOA. The current study considered multidisciplinary data from heterogeneous sources such as questionnaire data, physical activity indexes, self-reported data about joint symptoms, disability and function as well as general health and physical exams’ data from individuals with or without KOA from the baseline visit. For the data mining part, a robust feature selection methodology was employed consisting of filter, wrapper and embedded techniques whereas feature ranking was decided on the basis of a majority vote scheme. The validation of the extracted factors was performed in subgroups employing seven well-known classifiers. A 77.88 % classification accuracy was achieved by Logistic Regression on the group of the first forty selected (40) risk factors. We investigated the behavior of the best model, with respect to classification errors and the impact of used features, to confirm their clinical relevance. The interpretation of the model output was performed by SHAP. The results are the basis for the development of easy-to-use diagnostic tools for clinicians for the early detection of KOA.
膝骨关节炎(KOA)是一种引起关节疼痛、畸形和功能障碍的多因素疾病。本文的目的是提供一种数据挖掘方法,可以识别有助于KOA诊断的重要风险因素及其对模型输出的影响,重点是事后可解释性。数据来自骨关节炎倡议(OAI)数据库,纳入无症状性KOA和症状性KOA或发生KOA的高风险人群。目前的研究考虑了来自不同来源的多学科数据,如问卷调查数据、身体活动指数、关于关节症状、残疾和功能的自我报告数据,以及基线访问时患有或不患有KOA的个体的一般健康和体检数据。在数据挖掘部分,采用了由滤波、包装和嵌入技术组成的鲁棒特征选择方法,并基于多数投票方案确定特征排序。采用七个知名分类器对提取的因子进行亚组验证。对前40个选定的40个危险因素进行Logistic回归,分类准确率为77.88%。我们调查了最佳模型的行为,关于分类错误和使用特征的影响,以确认其临床相关性。模型输出的解释由SHAP执行。该结果为临床医生开发易于使用的诊断工具以早期发现KOA奠定了基础。
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引用次数: 3
Prediction of pain in knee osteoarthritis patients using machine learning: Data from Osteoarthritis Initiative 使用机器学习预测膝关节骨关节炎患者的疼痛:来自骨关节炎倡议的数据
Antonios Alexos, Christos Kokkotis, S. Moustakidis, E. Papageorgiou, D. Tsaopoulos
Knee Osteoarthritis(KOA) is a serious disease that causes a variety of symptoms, such as severe pain and it is mostly observed in the elder people. The main goal of this study is to build a prognostic tool that will predict the progression of pain in KOA patients using data collected at baseline. In order to do that we leverage a feature importance voting system for identifying the most important risk factors and various machine learning algorithms to classify, whether a patient’s pain with KOA, will stabilize, increase or decrease. These models have been implemented on different combinations of feature subsets, and results up to 84.3% have been achieved with only a small amount of features. The proposed methodology demonstrated unique potential in identifying pain progression at an early stage therefore improving future KOA prevention efforts.
膝骨关节炎(KOA)是一种严重的疾病,可引起多种症状,如剧烈疼痛,多见于老年人。本研究的主要目的是建立一种预后工具,利用基线收集的数据预测KOA患者疼痛的进展。为了做到这一点,我们利用一个特征重要性投票系统来识别最重要的风险因素和各种机器学习算法来分类,患者的KOA疼痛是稳定、增加还是减少。这些模型已经在不同的特征子集组合上实现,仅使用少量特征就可以达到84.3%的结果。所提出的方法在早期阶段识别疼痛进展方面显示出独特的潜力,从而改善未来KOA预防工作。
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引用次数: 6
Group affect Recognition: Facial Feature Extraction via Color Inverted Points 群体影响识别:基于颜色倒点的人脸特征提取
A. Triantafyllou, G. Tsihrintzis
The paper proposes a new approach to extract facial features via color inverted points. This approach has been incorporated in GRAFFER, a system that we have been developing towards GRoup AFFect Recognition in educational, entertaining and other events. As facial features and especially the eyes, the mouth and the eyebrows offer a lot of information about human emotional states, we investigated existing facial component extraction methods and developed feature extraction through color-inversion of frames-images with facial components.The proposed approach is implemented and tested on the extensive datasets that we have collected with GRAFFER.
提出了一种利用颜色倒立点提取人脸特征的新方法。这种方法已经被纳入了GRAFFER,这是一个我们一直在开发的系统,用于在教育、娱乐和其他活动中进行群体影响识别。由于面部特征,特别是眼睛、嘴巴和眉毛提供了大量关于人类情绪状态的信息,我们研究了现有的面部成分提取方法,开发了通过对含有面部成分的帧图像进行颜色反演的特征提取方法。我们在使用GRAFFER收集的大量数据集上对所提出的方法进行了实现和测试。
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引用次数: 0
A Sentiment-based Hotel Review Summarization using LSTM Neural Networks 基于情感的LSTM神经网络酒店评论总结
Agorakis Bompotas, A. Ilias, Maria Adamopoulos, Andreas Kanavos, C. Makris, G. Rompolas, A. Savvopoulos
Hotel customers express reviews for every accommodation service provided and/or for the accommodation as a whole. On the other hand, reviews are particularly interested for the tourism industry in order to extract customers’ opinions and aspects, which will assist them to improve their provided services. The reviews can be thoroughly found in the Web and their quantity can be considered as big data in Natural Language Processing. In this paper, we have designed an architecture and have implemented a system that initially utilizes some preprocessing techniques, as classic Natural Language Processing approaches, namely TF-IDF bag of words and word embeddings, are employed. These approaches can be further used as the input of various classifiers and Long Short Term Memory Neural Networks. The accuracy of these classifiers is evaluated on a dataset consisting of several reviews for the well known evaluation metrics, namely Precision, Recall and Fl-Measure.
酒店顾客会对酒店提供的每一项住宿服务和/或整个住宿进行评价。另一方面,评论对旅游业特别感兴趣,它可以提取顾客的意见和方面,这将有助于他们改善所提供的服务。这些评论可以在网上找到,其数量可以被认为是自然语言处理中的大数据。在本文中,我们设计了一个架构并实现了一个系统,该系统最初使用了一些预处理技术,如经典的自然语言处理方法,即TF-IDF词袋和词嵌入。这些方法可以进一步用作各种分类器和长短期记忆神经网络的输入。这些分类器的准确性在一个数据集上进行评估,该数据集由几个众所周知的评估指标(即Precision, Recall和Fl-Measure)的评论组成。
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引用次数: 5
Securing Access to Healthcare Data with Context-aware Policies 使用上下文感知策略保护对医疗保健数据的访问
Evgenia Psarra, Ioannis Patiniotakis, Giannis Verginadis, Dimitris Apostolou, G. Mentzas
Data security in the healthcare domain is of paramount importance. There is a need for advanced access control mechanisms that can be used in the healthcare domain and raise security awareness. In this work, we report on the development of a web-based editor, that enables a user to edit concepts and properties for tailoring a context-aware security model for creating and enforcing access control policies for electronic health records (EHRs). These access control policies are to be enforced as part of two different sequential authorisation paradigms that will be employed for achieving high levels of security controls. These paradigms are the Attributebased Access Control (ABAC), which permits or denies access and/or grants or not editing rights to (encrypted) EHRs and the Attribute-based Encryption (ABE), which handles the way sensitive data should be decrypted, so as to edit functionalities for creating context-aware access policies (ABAC and ABE).
医疗保健领域的数据安全至关重要。需要高级访问控制机制,这些机制可用于医疗保健领域并提高安全意识。在这项工作中,我们报告了基于web的编辑器的开发,该编辑器使用户能够编辑概念和属性,以定制上下文感知的安全模型,从而为电子健康记录(EHRs)创建和实施访问控制策略。这些访问控制策略将作为两种不同的顺序授权范例的一部分来实施,这些范例将用于实现高级别的安全控制。这些范例是基于属性的访问控制(ABAC),它允许或拒绝访问和/或授予或不授予(加密)电子邮件记录的编辑权限;以及基于属性的加密(ABE),它处理敏感数据的解密方式,以便编辑功能以创建上下文感知的访问策略(ABAC和ABE)。
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引用次数: 6
Web-based Application for Screening Energy Efficiency Investments: A MCDA Approach 筛选能源效率投资的网络应用:MCDA方法
A. Papapostolou, Filippos-Dimitrios K. Mexis, Elissaios Sarmas, C. Karakosta, J. Psarras
Energy Efficiency (EE) has been identified as one of the most cost-effective means aiming at reducing energy consumption while maintaining an equivalent level of economic activity. Mainstreaming EE financing is considered a key priority to avert climate change. The lack of evidence on the performance, commonly agreed procedures and standards for EE investments, particularly during the first stages of investment generation and pre-selection/pre-evaluation, are the key problems hampering EE investment financing. It is also true that often project developers do not have the expertise or resources to make a convincing financing case for investors. In order to boost EE investments, this paper proposes a Multi-Criteria Decision Analysis (MCDA) methodology intending to support financing institutions to identify attractive EE project ideas in the early development phase of project initiation and planning. The study implements the ELECTRE TRI method to benchmark EE project ideas in a standardized, investor recognizable credit rating form. A respective web-based tool facilitating the methodology and the screening of EE projects is also developed, supporting financing bodies and EE funds to rapidly detect and aggregate projects that meet the necessary criteria to be financed.
能源效率(EE)已被确定为最具成本效益的手段之一,旨在减少能源消耗,同时保持同等水平的经济活动。绿色能源融资主流化被认为是避免气候变化的关键优先事项。特别是在投资产生和预选/预评估的第一阶段,缺乏关于EE投资绩效的证据、共同商定的程序和标准,是阻碍EE投资融资的关键问题。此外,项目开发商往往缺乏专业知识或资源,无法为投资者提供令人信服的融资案例。为了促进节能环保投资,本文提出了一种多标准决策分析(MCDA)方法,旨在支持金融机构在项目启动和规划的早期发展阶段确定有吸引力的节能环保项目理念。本研究采用ELECTRE TRI方法,以一种标准化的、投资者可识别的信用评级形式对EE项目理念进行基准测试。此外,还开发了一种基于网络的工具,以促进EE项目的方法和筛选,支持融资机构和EE基金迅速发现和汇总符合必要标准的项目。
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引用次数: 7
Eye Gaze Analysis of Students in Educational Systems 教育系统中学生的目光分析
Panteleimon-Evangelos Aivaliotis, F. Grivokostopoulou, I. Perikos, Ioannis Daramouskas, Ioannis Hatziligeroudis
Eye gaze provides indicative information about the status and the behavior of a person and can be very assistive in human-computer interaction. Eye-gaze analysis is very helpful in a variety of applications in order to understand the interest of the users, their behavior or even to unveil distractions. However, the accurate eye-gaze estimation is a very challenging process. In this paper, we present an eye gaze estimation work that relies on convolutional neural networks which imitate the LeNet’s architecture. They analyze eye gaze and provide a 2D vector that concerns the coordinates of the specific pixel inside the 2D screen’s space, in which the user is looking at. Also, a system capable of working under various real-world conditions such as light, angle and distance differentiations was designed and developed. An evaluation study was performed and the results are quite promising pointing out that the system is scalable and accurate in estimating the eye gaze of the users.
眼神凝视提供了关于一个人的状态和行为的指示性信息,在人机交互中非常有帮助。眼球注视分析在很多应用中都非常有用,它可以帮助我们了解用户的兴趣、行为,甚至可以帮助我们发现干扰因素。然而,准确的人眼注视估计是一个非常具有挑战性的过程。在本文中,我们提出了一种基于卷积神经网络的人眼注视估计方法,该方法模仿LeNet的结构。它们分析眼睛的凝视,并提供一个2D向量,该向量与用户正在观看的2D屏幕空间内特定像素的坐标有关。此外,设计和开发了一个能够在各种现实条件下工作的系统,如光线、角度和距离差异。进行了评估研究,结果表明该系统具有可扩展性和准确性,可以准确地估计用户的目光。
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引用次数: 2
A Theoretical Persuasive Framework for Supporting and Evolving an Individual’s Sustainable Mobile Traveling Attitude 支持和发展个体可持续移动旅行态度的理论说服框架
M. Angelaki, T. Karvounidis, C. Douligeris
This paper proposes an innovative theoretical framework for the development of a persuasive prototype for supporting and evaluating an individual’s traveling attitude through the use of well-designed persuasive smartphone applications for sustainable urban mobility purposes. The newly introduced framework emphasizes the importance of engaging and committing users to improve their travel habits through continuous motivation and evaluation of both how their traveling habits affect the environment and how they contribute to better future mobility planning decisions. It consists of five stages; it takes into consideration various elements from existing frameworks and introduces a critical stage, that of the users’ rewarded assessment/feedback, based on the daily evaluation of the application effectiveness to persuade the user to move in an eco-friendlier way. For each stage of the proposed framework, a detailed description of the strategies that could be applied, and the related target group is provided.
本文提出了一个创新的理论框架,用于开发一个有说服力的原型,通过使用精心设计的有说服力的智能手机应用程序来支持和评估个人的旅行态度,以实现可持续的城市交通目的。新引入的框架强调了通过持续激励和评估用户的出行习惯对环境的影响以及对未来出行规划决策的贡献,吸引和承诺用户改善其出行习惯的重要性。它包括五个阶段;它考虑到现有框架中的各种元素,并引入一个关键阶段,即用户奖励评估/反馈,基于对应用程序有效性的日常评估,以说服用户以更环保的方式行动。对于拟议框架的每个阶段,都提供了可应用的战略和相关目标群体的详细说明。
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引用次数: 0
Switching angles calculation through Mathematical optimization in Multilevel Inverters 基于数学优化的多电平逆变器开关角计算
Ioannis Batsis, D. Bargiotas, Aspassia Daskalopulu
The Inverter is a DC/AC type Power Converter and is an important part of Electrical Power Networks because several energy source outputs are in DC form. In the mid-80s, the Multilevel Inverter (MLI) was developed. Its output is a staircase waveform, which approximates the sinusoidal waveform of the Power Network. Approximation improves as the number of stairs (levels) increases. But due to practical difficulties, concerning the circuit layout and the implementation of a suitable control strategy for the switching elements, eleven levels output is a common practice. Research interest around MLIs abounds due to the advantages they offer compared to classical DC/AC Inverters. MLIs may lead to new circuit layouts with fewer components, novel and more effective control strategies for the switching elements and to the development of new modulation methods for calculating the time of activation and deactivation of the switching elements. In this paper we propose a new modulation method based on the technique of Mathematical optimization.
逆变器是一种DC/AC型功率变换器,是电网的重要组成部分,因为几个电源输出都是直流形式的。在80年代中期,多电平逆变器(MLI)被开发出来。它的输出是一个阶梯波形,近似于电网的正弦波形。近似值随着楼梯(水平)的增加而提高。但由于实际操作的困难,在电路布局和开关元件控制策略的实施方面,十一电平输出是一种常见的做法。由于与传统的DC/AC逆变器相比,mli具有优势,因此对mli的研究兴趣丰富。mli可能会导致新的电路布局与更少的元件,新颖和更有效的控制策略的开关元件,并开发新的调制方法来计算开关元件的激活和失活的时间。本文提出了一种新的基于数学优化技术的调制方法。
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引用次数: 1
MADM System for the Development of Adaptable Mobile Applications for People with Intellectual Disabilities 为智障人士开发可适应移动应用程序的MADM系统
O. Shabalina, V. Guriev, Stanislav Kosyakov, Nikita Dmitriev, A. Davtian
Many people with intellectual disabilities (PID) can experience problems in different aspects of their everyday life. The capabilities of modern mobile applications offer promising opportunities to help PID to cope with their everyday life problems and to feel more confident in everyday activities. Mobile application development is one of the most fast-moving industries and to support the mobile applications development process special software tools are designed. However, the development of mobile applications for PID has its own specifics due to capabilities and limitations of this category of users. The article presents a mobile application development management (MAMD) system, that takes into account these specifics and covers both the stage of the development of mobile applications for PID and the stage of their usage. The system supports modular development of mobile applications based on reusing software components. The system allows to conFigure the interface of mobile applications and adapt it to the users with different capabilities and limitations. The system is universal in terms of platform selection, so the developers of mobile applications for PID can always chose the most suitable platform for different categories of PID.
许多智障人士在日常生活的不同方面都会遇到问题。现代移动应用程序的功能提供了有希望的机会,帮助PID处理他们的日常生活问题,并在日常活动中感到更自信。移动应用程序开发是发展最快的行业之一,为了支持移动应用程序的开发过程,设计了特殊的软件工具。然而,由于这类用户的能力和限制,PID移动应用程序的开发有其特殊性。本文提出了一个移动应用程序开发管理(MAMD)系统,该系统考虑了这些细节,并涵盖了PID移动应用程序的开发阶段和使用阶段。该系统支持基于软件组件复用的移动应用模块化开发。该系统允许配置移动应用程序的界面,并使其适应不同能力和限制的用户。系统在平台选择上具有通用性,因此PID移动应用的开发者可以随时针对不同类别的PID选择最适合的平台。
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引用次数: 0
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2020 11th International Conference on Information, Intelligence, Systems and Applications (IISA
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