Proceedings of the 21st Pan-Hellenic Conference on Informatics最新文献

Machine Learning Technique in Time Series Prediction of Gross Domestic Product 国内生产总值时间序列预测中的机器学习技术

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139443

Georgios N. Kouziokas

引用次数: 6

ToA estimation system for efficient cycling in Smart Cities 智慧城市高效骑行的ToA估算系统

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139412

Theodoros Anagnostopoulos, K. Ntalianis, Christos Skourlas, I. Sosunova, P. Fedchenkov, A. Zaslavsky

引用次数: 1

LIVA: An efficient local breakout scheme for V2V communicatons LIVA:一种高效的V2V通信本地分路方案

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139393

A. Kaloxylos

引用次数: 5

Privacy Flag: A crowdsourcing platform for reporting and managing privacy and security risks 隐私标志:一个报告和管理隐私和安全风险的众包平台

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139432

V. Vlachos, Y. Stamatiou, Adelina Madhja, S. Nikoletseas

{"title":"Privacy Flag: A crowdsourcing platform for reporting and managing privacy and security risks","authors":"V. Vlachos, Y. Stamatiou, Adelina Madhja, S. Nikoletseas","doi":"10.1145/3139367.3139432","DOIUrl":"https://doi.org/10.1145/3139367.3139432","url":null,"abstract":"Nowadays we are witnessing an unprecedented evolution in how we gather and process information. Technological advances in mobile devices as well as ubiquitous wireless connectivity have brought about new information processing paradigms and opportunities for virtually all kinds of scientific and business activity. These new paradigms rest on three pillars: i) numerous powerful portable devices operated by human intelligence, ubiquitous in space and available, most of the time, ii) unlimited environment sensing capabilities of the devices, and iii) fast networks connecting the devices to Internet information processing platforms and services. These pillars implement the concepts of crowdsourcing and collective intelligence. These concepts describe online services that are based on the massive participation of users and the capabilities of their devices.in order to produce results and information which are \"more than the sum of the part\". The EU project Privacy Flag relies exactly on these two concepts in order to mobilize roaming citizens to contribute, through crowdsourcing, information about risky applications and dangerous web sites whose processing may produce emergent threat patterns, not evident in the contributed information alone, reelecting a collective intelligence action. Crowdsourcing and collective intelligence, in this context, has numerous advantages, such as raising privacy-awareness among people. In this paper we summarize our work in this project and describe the capabilities and functionalities of the Privacy Flag Platform.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125950049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Movie SCoRe: Personalized Movie Recommendation on Mobile Devices 电影评分:移动设备上的个性化电影推荐

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139383

H. Papadakis, N. Michalakis, P. Fragopoulou, C. Panagiotakis, A. Malamos

引用次数: 5

Intrinsic dimension estimation of the fMRI space via sparsity-promoting matrix factorization: Counting the 'brain cores' of the human brain 通过稀疏促进矩阵分解的fMRI空间的固有维数估计:人脑的“脑核”计数

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139391

H. Georgiou

{"title":"Intrinsic dimension estimation of the fMRI space via sparsity-promoting matrix factorization: Counting the 'brain cores' of the human brain","authors":"H. Georgiou","doi":"10.1145/3139367.3139391","DOIUrl":"https://doi.org/10.1145/3139367.3139391","url":null,"abstract":"Functional Magnetic Resonance Imaging (fMRI) is a powerful non-invasive tool for localizing and analyzing brain activity. This study focuses on one very important aspect of the functional properties of human brain, specifically the estimation of the level of parallelism when performing complex cognitive tasks. Using fMRI as the main modality, the human brain activity is investigated through a purely data-driven signal processing and dimensionality analysis approach. Specifically, the fMRI signal is treated as a multidimensional data space and its intrinsic 'complexity' is studied via sparsity-promoting matrix factorization in the sense of blind-source separation (BSS). One simulated and two real fMRI datasets are used in combination with Independent Component Analysis (ICA) for estimating the intrinsic (true) dimensionality via detection of statistically independent concurrent signal sources. This analysis provides reliable data-driven experimental evidence on the number of independent active brain processes that run concurrently when visual or visuo-motor tasks are performed. The results prove that, although this number is can not be defined as a hard threshold but rather as a continuous range, however when a specific activation level is defined, an estimated number of concurrent processes or the loose equivalent of 'brain cores' can be detected in human brain activity.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129417034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Vulnerability Severity using Text Mining 基于文本挖掘的漏洞严重性评估

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139390

Georgios Spanos, L. Angelis, Dimitrios Toloudis

{"title":"Assessment of Vulnerability Severity using Text Mining","authors":"Georgios Spanos, L. Angelis, Dimitrios Toloudis","doi":"10.1145/3139367.3139390","DOIUrl":"https://doi.org/10.1145/3139367.3139390","url":null,"abstract":"Software1 vulnerabilities are closely associated with information systems security, a major and critical field in today's technology. Vulnerabilities constitute a constant and increasing threat for various aspects of everyday life, especially for safety and economy, since the social impact from the problems that they cause is complicated and often unpredictable. Although there is an entire research branch in software engineering that deals with the identification and elimination of vulnerabilities, the growing complexity of software products and the variability of software production procedures are factors contributing to the ongoing occurrence of vulnerabilities, Hence, another area that is being developed in parallel focuses on the study and management of the vulnerabilities that have already been reported and registered in databases. The information contained in such databases includes, a textual description and a number of metrics related to vulnerabilities. The purpose of this paper is to investigate to what extend the assessment of the vulnerability severity can be inferred directly from the corresponding textual description, or in other words, to examine the informative power of the description with respect to the vulnerability severity. For this purpose, text mining techniques, i.e. text analysis and three different classification methods (decision trees, neural networks and support vector machines) were employed. The application of text mining to a sample of 70,678 vulnerabilities from a public data source shows that the description itself is a reliable and highly accurate source of information for vulnerability prioritization.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128232426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

Cross-layer Aware TDD Frame Adaptation for FDD/TDD Carrier Aggregation in LTE-A Systems LTE-A系统中FDD/TDD载波聚合的跨层感知TDD帧自适应

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139370

Apostolos Xenakis, F. Foukalas

{"title":"Cross-layer Aware TDD Frame Adaptation for FDD/TDD Carrier Aggregation in LTE-A Systems","authors":"Apostolos Xenakis, F. Foukalas","doi":"10.1145/3139367.3139370","DOIUrl":"https://doi.org/10.1145/3139367.3139370","url":null,"abstract":"In this paper, we study the aggregation between the FDD and TDD spectrum bands within the context of 3GPP LTE-A system. To be specific, we first provide a cross-layer design analysis to obtain the achievable throughput using the TDD mode for transmission in LTE-A system. Under particular QoS requirements and certain channel conditions, the achievable throughput is derived and evaluated. The QoS requirements originate from the upper layers, where the file size, the TCP window size and the latency for efficient transmission are incorporated in the final formulation. Having obtained the formulation, simulation results highlight the impact of the QoS parameters to different TDD frame formats. We therefore propose a framework for TDD frame adaptation within the LTE-A system. The aim of this framework is to provide the options of choosing different TDD frame formats by calculating the DL:UL subframes ratio under certain channel conditions and QoS requirements. Simulation results are carried out, which reveal the probability of choosing the different TDD frame formats from the system under certain channel conditions and QoS requirements.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129287492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

E-PreS: Evaluation of Building Evacuation Drills: A Smart Tool to Help Building Evacuation Drill Designers to Find the Optimal Evacuation Pattern E-PreS:建筑疏散演习评估:帮助建筑疏散演习设计者找到最佳疏散模式的智能工具

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139369

Michail Chatzidakis, Michael Loukeris, S. Hadjiefthymiades

引用次数: 0

Affiance Computer Science and Machining Technology for cheap and efficient Solar Energy 面向廉价高效太阳能的计算机科学与加工技术

Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139445

N. Karanikolas, A. Liaramantzas

引用次数: 2