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

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Maturity Level of the Quality Assurance Evaluation Procedures in Higher Education: A qualitative research 高等教育质量保证评价程序成熟度的定性研究
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139438
Manolis Chalaris, Ioannis Chalaris, S. Gritzalis, C. Sgouropoulou
{"title":"Maturity Level of the Quality Assurance Evaluation Procedures in Higher Education: A qualitative research","authors":"Manolis Chalaris, Ioannis Chalaris, S. Gritzalis, C. Sgouropoulou","doi":"10.1145/3139367.3139438","DOIUrl":"https://doi.org/10.1145/3139367.3139438","url":null,"abstract":"The establishment of mature operational procedures to support the educational process and the attempt to standardize and certificate these procedures is a very arduous and a demanding task that requires ensuring conditions in several levels of government. At the same time, according to the latest requirements of HQAA (Hellenic Quality Assurance & Accreditation Agency) regarding the certification of study programs and the gradual establishment of quality assurance mechanisms, it is a necessity for all educational institutions to establish such operational procedures. Standardization of procedures and effective change management are the critical issues. In this work we measured the maturity level of the current evaluation processes in an advanced academic department of a HEI (Higher Education Institute) as well as of the new procedures proposed by HQAA for the Certification of Curricula and of the establishment of a Quality Assurance System (QAS). Based on the results of our research it is possible to draw conclusions about the feasibility of implementing the new required procedures and the degree of difficulty of their application and exploitation. At the same time, an assessment of the level of process maturity in the academic department is possible, using Capability Maturity Models. At the end of this work we present a road map for the development of a QAS for a HEI.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"14 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":"131901827","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: 2
Wearable Panic Attack Detection System 可穿戴惊恐发作检测系统
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139434
Maria Sapounaki, Ioanna Polychronou, Maria Gkonta, Angeliki Vogiatzoglou, A. Kakarountas
{"title":"Wearable Panic Attack Detection System","authors":"Maria Sapounaki, Ioanna Polychronou, Maria Gkonta, Angeliki Vogiatzoglou, A. Kakarountas","doi":"10.1145/3139367.3139434","DOIUrl":"https://doi.org/10.1145/3139367.3139434","url":null,"abstract":"The paper proposes a wearable system for panic attack detection, constructed by COTS products. It is the first open hardware/open software prototype of its kind to the best of the authors knowledge. In this paper, the requirements of the system are presented, as well as the development of the system using open hardware and open software. All the components are described and the system is detailed in order to be repeated for use as a reference system for panic attack detection.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"14 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":"122130241","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
Supply Current Monitoring for Anomaly Detection on IoT Devices 物联网设备异常检测的供电电流监测
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139423
Dimitrios Myridakis, G. Spathoulas, A. Kakarountas
{"title":"Supply Current Monitoring for Anomaly Detection on IoT Devices","authors":"Dimitrios Myridakis, G. Spathoulas, A. Kakarountas","doi":"10.1145/3139367.3139423","DOIUrl":"https://doi.org/10.1145/3139367.3139423","url":null,"abstract":"This paper presents results from the correlation of the supply current of a smart device to its functional characteristics in order to detect a manufacturing or an operational anomaly. Awareness of the typical operation of a smart device in terms of operation and functionality, may prove valuable, since any deviation may warn for operational or functional anomaly. This is a symptomatic approach rather than an analytical approach of the cause. In this paper, the deviation (either increase or decrease) of the supply current is exploited for this reason. The paper offers the results from an IP camera case study that proves this assumption.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"28 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":"122178372","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: 7
Experimental Study of the Resilience of a Graph-based Watermarking System under Edge Modifications 边缘修改下基于图的水印系统弹性的实验研究
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139436
Anna Mpanti, Stavros D. Nikolopoulos, Maria Rini
{"title":"Experimental Study of the Resilience of a Graph-based Watermarking System under Edge Modifications","authors":"Anna Mpanti, Stavros D. Nikolopoulos, Maria Rini","doi":"10.1145/3139367.3139436","DOIUrl":"https://doi.org/10.1145/3139367.3139436","url":null,"abstract":"Over the last 25 years, a wide range of software watermarking techniques has been proposed encoding watermark numbers as graphs whose structure resembles that of real program graphs. In this domain, we have recently proposed several watermarking codec systems for encoding integer numbers w as reducible permutation flow-graphs F[π*] through the use of self-inverting permutations π*. Following up on our codec systems, we experimentally study the oldest one in order to investigate and attest its resilience to edge-modification attacks on its flow-graph F[π*]. In particular, we construct the flow-graphs F[πi*] which encode the watermarks wi in the range R4 = [8,15], we attack the graph F[πi*] by modifying k edges, perform a series of experiments for each attack case, and determine the percentage of the cases maintaining four properties, namely, Odd-One, Bitonic, Block and Range. Whenever a flow-graph F[πi*] is attacked having k edges modified, if all the four properties are satisfied during the decoding process then the decoding algorithm returns a true-incorrect watermark wj, that is, wj ≠ wi. The experimental study reveals those watermarks wi ∈ R4 which are more resilient in the sense that the decoding algorithm has low probability to return a true-incorrect watermark wj after an edge-modification attack to graph F[πi*] encoding a watermark wi.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"19 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":"114898091","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: 2
Tracking football players with a conventional mobile device camera 用传统的移动设备摄像头跟踪足球运动员
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139411
Eirini Charalampaki, A. Malamos
{"title":"Tracking football players with a conventional mobile device camera","authors":"Eirini Charalampaki, A. Malamos","doi":"10.1145/3139367.3139411","DOIUrl":"https://doi.org/10.1145/3139367.3139411","url":null,"abstract":"One of many important tasks in computer vision applications is real time object detection and tracking. Although classical tracking algorithms work accurately in perfectly arranged conditions, tracking objects in real-life situations poses challenges due to the multitude of variable conditions. However, efficient object tracking is a difficult task due to the multitude of the conditions met. Significant problems arise in computer vision systems, especially under the presence of noise, scene illumination, object shape variation and total or partial occlusion. The purpose of this paper is to develop a method for effective object tracking and detection in complex scenes, such as sports games. The proposed approach would enable to accurately track targets in motion in real scenes.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"15 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":"130611017","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
On Improving the Speedup of Slice and Tile Level Parallelism in HEVC Using AVX2 利用AVX2提高HEVC中切片和平铺并行度的加速
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139427
Dimitris Skoumpourdis, Panos K. Papadopoulos, M. Koziri, Nikos Tziritas, Thanasis Loukopoulos, Ioannis Anagnostopoulos
{"title":"On Improving the Speedup of Slice and Tile Level Parallelism in HEVC Using AVX2","authors":"Dimitris Skoumpourdis, Panos K. Papadopoulos, M. Koziri, Nikos Tziritas, Thanasis Loukopoulos, Ioannis Anagnostopoulos","doi":"10.1145/3139367.3139427","DOIUrl":"https://doi.org/10.1145/3139367.3139427","url":null,"abstract":"HEVC has emerged as the new video coding standard promising improved compression ratios (for the same quality) by up to 50% compared to H.264/AVC. To achieve this performance HEVC requires increased computational overhead compared to its predecessor. For this reason parallelism is used, usually at a coarse grained level, e.g., per slice or tile. In this paper we turn our attention towards further speeding up the HEVC encoding process by combining coarse grained parallelism with fine grained, in the form of AVX2 instructions implementing SIMD parallelism at SAD (Sum of Absolute Difference) and SSE (Sum of Squared Error) calculations. Experimental evaluation with common test video sequences illustrates that an additional reduction (in encoding time) of roughly 11% on average, compared to standalone coarse grained parallelism is achievable, leading in many cases to superlinear speedup.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"47 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":"129674285","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
Systolic Binary Counter using a Cellular Automaton-based Prescaler 基于元胞自动机预分频器的收缩二进制计数器
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139433
Vasileios Chioktour, G. Spathoulas, A. Kakarountas
{"title":"Systolic Binary Counter using a Cellular Automaton-based Prescaler","authors":"Vasileios Chioktour, G. Spathoulas, A. Kakarountas","doi":"10.1145/3139367.3139433","DOIUrl":"https://doi.org/10.1145/3139367.3139433","url":null,"abstract":"Counters are among the fundamental digital circuits in every computing system. For this reason, counter design is of great interest in the design of computers and embedded systems, in terms of area requirements, power dissipation and performance. Many techniques have been proposed in the past specifically to increase the counter's speed without increasing design complexity. Traditionally, it is of great concern to make a fast counter suitable for many applications, without adding to the critical path and keeping speed independent of its size. In this work, a binary counter is proposed, based on 1D Cellular Automata (CA), which is used as a prescaler in a systolic structure, that offers constant delay for counters of various bit-widths.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"68 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":"121787884","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
Sentiment Analysis to Track Emotion and Polarity in Student Fora 情感分析追踪学生论坛的情绪与极性
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139389
Andreas F. Gkontzis, Christoforos V. Karachristos, C. Panagiotakopoulos, E. C. Stavropoulos, Vassilios S. Verykios
{"title":"Sentiment Analysis to Track Emotion and Polarity in Student Fora","authors":"Andreas F. Gkontzis, Christoforos V. Karachristos, C. Panagiotakopoulos, E. C. Stavropoulos, Vassilios S. Verykios","doi":"10.1145/3139367.3139389","DOIUrl":"https://doi.org/10.1145/3139367.3139389","url":null,"abstract":"The purpose of this paper is to propose a data mining methodology for analysing data relating to the participation of students in the online forum of a postgraduate course at the Hellenic Open University. Data is migrated to MongoDB, a NoSQL database management system, and analysed using the rmongodb package of R statistical environment. We focus in sentiment analysis to extract the emotional knowledge of students' fora. Polarity and emotion are identified in messages and are classified as positive, negative or neutral. Messages are categorized and visualized in six basic emotions, as a multiclass approach in understanding students' written opinion. By identifying sentiment behaviour from students' discussion fora, we are able to assess the effectiveness of the learning environment to improve students' learning experience, tutors' instructional experience and the university's institutional strategic view.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"14 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":"129167472","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: 22
Usability Testing of Mobile Applications: Web vs. Hybrid Apps 移动应用的可用性测试:Web vs.混合应用
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139410
Panagiotis T. Koziokas, N. Tselikas, G. Tselikis
{"title":"Usability Testing of Mobile Applications: Web vs. Hybrid Apps","authors":"Panagiotis T. Koziokas, N. Tselikas, G. Tselikis","doi":"10.1145/3139367.3139410","DOIUrl":"https://doi.org/10.1145/3139367.3139410","url":null,"abstract":"The paper targets on usability testing comparison of two different models used in mobile applications' development. We first present the most popular models used in mobile applications' development. We compare two of them, i.e., the web applications' and the hybrid applications' model, respectively based on qualitative and quantitative usability evaluation criteria. Finally, we present and evaluate the corresponding experimental corresponding results.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"5 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":"133440612","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: 4
Natural interaction with large map interfaces in VR 与VR中的大地图界面进行自然交互
Proceedings of the 21st Pan-Hellenic Conference on Informatics Pub Date : 2017-09-28 DOI: 10.1145/3139367.3139424
I. Giannopoulos, Andreas Komninos, J. Garofalakis
{"title":"Natural interaction with large map interfaces in VR","authors":"I. Giannopoulos, Andreas Komninos, J. Garofalakis","doi":"10.1145/3139367.3139424","DOIUrl":"https://doi.org/10.1145/3139367.3139424","url":null,"abstract":"Location based services are a common application scenario in mobile and ubiquitous computing. A major issue with map applications in this domain is the limited size of the display, which makes interaction and visualization a difficult problem to solve. With the increasing popularity of VR and AR systems, an opportunity exists for map-based applications to overcome the limitation small display sizes, as the user's information visualization space can extend to her entire surroundings. We present a preliminary investigation into how interaction with such very large display interfaces can take place, using a virtual reality headset as the sole input and interaction method.","PeriodicalId":436862,"journal":{"name":"Proceedings of the 21st Pan-Hellenic Conference on Informatics","volume":"27 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":"124049710","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: 18
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