2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)最新文献

{"title":"Hybrid ML-MMSE adaptive multiuser detection based on joint channel estimation in SDMA-OFDM systems","authors":"U. Yesilyurt, Ö. Ertug","doi":"10.23919/SOFTCOM.2017.8115545","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115545","url":null,"abstract":"Multiuser Detection (MUD) and Channel Estimation techniques in Space-Division Multiple Access aided Orthogonal Frequency Division Multiplexing (SDMA-OFDM) systems recently received intensive interest in receiver design technologies. The maximum likelihood (ML) MUD that provides optimal performance has the cost of a dramatically increased computational complexity. The minimum mean-squared error (MMSE) MUD exhibit poor performance even though it achieves lower computational complexity. In this paper, Hybrid ML-MMSE adaptive multiuser detection based on joint channel estimation method is suggested for signal detection. The simulation results show that the proposed method has good performance close to optimal ML performance at low SNR values and a low computational complexity at high SNR values.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114409754","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}

{"title":"Evaluation of quiz using a statistical calculation in learning management system","authors":"Matea Markie","doi":"10.23919/SOFTCOM.2017.8115535","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115535","url":null,"abstract":"Learning Management Systems provide us quizzes for assessment of students' knowledge, and also a statistic report of those quizzes. Our aim was to use statistic reports as a tool for quality assessment of the five quizzes, during two academic years 2015/2016 and 2016/2017. The experiment covered five Moodle quizzes, 80 questions, and 55 students. We examined the reliability of the quizzes as they are an important part of learning and teaching process. Item analysis of the quiz is observed as the one step in learning analytics cycle. We also discuss the connection between question type and students' results on quizzes.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131953786","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}

{"title":"A smart tone reservation scheme for reducing the high PAPR of the FBMC/OQAM signal","authors":"Mounira Laabidi, R. Bouallègue","doi":"10.23919/SOFTCOM.2017.8115510","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115510","url":null,"abstract":"High Peak to Average Power Ratio (PAPR) of the Filter bank Multi-carriers Modulations (FBMC) signal has been extensively addressed in recent research studies. In this paper, we suggest an optimized and novel version of the overlapped Sliding Window Tone Reservation (SW-TR) algorithm in order to reduce the PAPR of the FBMC/OQAM signal. Our PAPR reduction scheme termed Smart Tone Reservation (STR) uses the Smart Gradient Project (SGP) algorithm to accelerate the convergence rate of the SW-TR algorithm. Simulation results indicate that the suggested PAPR reduction scheme for FBMC/OQAM is not only efficient in reducing the PAPR of the FBMC/OQAM signal with only one iteration but also outperforms OFDM with SGP-TR scheme.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127471049","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}

{"title":"Enhancing VNF's performance using DPDK driven OVS user-space forwarding","authors":"Dani Vladislavic, D. Huljenic, J. Ožegović","doi":"10.23919/SOFTCOM.2017.8115534","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115534","url":null,"abstract":"Network function virtualization (NFV) is a concept aiming to achieve telecom grade cloud ecosystem for new generation networks focusing on Capital and Operational expenditure (CAPEX and OPEX) savings. Keeping at least the same performances is one of the main requirements of the applications when being virtualized. This work presents a performance impact of Open Virtual Switch (OVS) user-space forwarding on efficiency measured in CPU load vs. throughput for the Virtual Network Function (VNF) using small packets and SCTP transport — Ericsson virtual IP-Signalling Transfer Point (vIP-STP). The conducted research discusses the benefits of using Data Plane Development Kit (DPDK) and significant performance improvements.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"2 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120917846","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}

{"title":"Steganography using local colour statistics","authors":"Tomislav Jurin, Barbara Džaja, Tonko Kovačević","doi":"10.23919/SOFTCOM.2017.8115586","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115586","url":null,"abstract":"From their beginning, people have always been prone to hiding something. Nowadays, the need for sending hidden messages has become the matter of pride and elite knowledge of managing how to send something to someone right in front of the eyes of others without others knowing about the communication. It opens a complete new perspective of the world, parallel to the existing one, where hidden messages create the world of their own. Steganography is one of the subdiscipline in the information hiding techniques. While cryptography is about protecting the content of messages, steganography is about concealing message existence in the image. In this paper the new steganography method based on the local colour statistics for edge definition in image is proposed. By defining the edges in the image, a secret map where to put the message that should not be seen is created. Differentiating the quality and thickness of the edges in the image the key to secret message can be manipulated, and not that easily cracked.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116720627","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}

{"title":"Network analysis of evolving software-systems","authors":"S. Babic, Tihana Galinac Grbac","doi":"10.23919/SOFTCOM.2017.8115564","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115564","url":null,"abstract":"Many real-world systems can be represented as networks, such as social networks, Internet, metabolic networks, food webs, neural networks, communication and distribution networks. The same approach can be adopted for the software-systems. Although this topic has been subject of research for some time now, there are still unresolved problems. In our work, we have analyzed ten versions of Java development tool (JDT) evolving open-source software-system, adopting new approach in software engineering that uses a network theory. Statistical analysis of software networks has revealed some properties such as, power-law degree distribution, scale-free and small-world. And our work is based on detecting these properties on an open-source software-system in evolution.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129215266","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}

{"title":"Temperature increase in the extracted and compound eye models","authors":"M. Cvetković, Hrvoje Dodig, D. Poljak","doi":"10.23919/SOFTCOM.2017.8115589","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115589","url":null,"abstract":"The paper deals with the comparison of the temperature increase due to a high frequency exposure in two realistic human eye models. The first model of the human eye, named extracted eye model is placed in the free space, while the second model of the eye, named compound eye model is included in the detailed human head model obtained from the magnetic resonance imaging scans. The numerical results are obtained using the hybrid finite element/boundary element method (FEM/BEM) formulation for the electromagnetic model, while the thermal dosimetry model based on the use of Pennes bioheat transfer equation is treated via FEM technique. Although qualitatively similar distributions of temperature increase have been obtained for both eye models, further analysis showed that the compound eye model is more suitable when the polarization of the incident EM wave is taken into account. On the other hand, the extracted eye model, due to much easier implementation compared to the compound model, can be found helpful when carrying out the preliminary dosimetric analysis.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128501645","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}

{"title":"Computation of Carson formulas using piecewise quadratic approximation","authors":"I. Krolo, S. Vujević, Tonći Modrić","doi":"10.23919/SOFTCOM.2017.8115518","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115518","url":null,"abstract":"In this paper, an existing numerical algorithm for high-accurate computation of exact Carson formulas based on piecewise linear approximation is improved. Carson formulas are used for computing of per-unit-length (pul) self and mutual impedances of infinitely long parallel conductors. The proposed algorithm is based on piecewise quadratic approximation of kernel function and analytical integrations of approximated kernel function multiplied by the rest of two integrands. Using proposed algorithm, high-accurate results with desired computer machine n-digit accuracy can be easily obtained. Total number of sample points is significantly decreased with proposed algorithm in comparison with piecewise linear approximation. Results computed by two approximation methods are compared with high-accurate results computed by proposed numerical algorithm for large frequency range.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115800250","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}

{"title":"Application of the behaviour change wheel framework to the development of interventions within the City4Age project","authors":"A. Direito, S. Michie, C. Lefevre, Emilly I M. Collins","doi":"10.23919/SOFTCOM.2017.8115507","DOIUrl":"https://doi.org/10.23919/SOFTCOM.2017.8115507","url":null,"abstract":"The probability of an intervention being effective is likely increased if it is designed following a behavioural analysis and with the aid of evidence-based intervention frameworks. For example, the Behaviour Change Wheel (BCW) framework and its associated COM-B model of behaviour have been used successfully as a starting point for designing behaviour change interventions. However, the BCW framework can also be applied at a later stage in the design process, such as when an intervention has been designed but before it is deployed. Here we describe the application of the BCW framework and COM-B model to evaluate and refine already designed interventions. We use a multidisciplinary multi-site project (‘City4Age’) as a case study. The project aims to promote independent living of older adults through the deployment of interventions using wearable and environment-based technology. We conducted face-to-face interviews with site representatives to identify the target behaviours, perceived barriers and facilitators, intervention functions, and modes of delivery for each planned intervention. Additionally, literature reviews were conducted to identify evidence-based facilitators and barriers for each targeted behaviour. Subsequently, we 1) compared the intervention functions proposed by the project-sites with those most likely to be effective according to the BCW; and 2) assessed the congruency of the barriers and facilitators identified by the pilot-sites with those identified in the literature. For five planned interventions across two project-sites (Birmingham and Singapore), two had intervention functions unlikely to be effective according to the BCW. The two planned interventions to promote social engagement did not address barriers or facilitators evident in the literature, indicating they required refinement. Applying the BCW framework allowed to identify which interventions needed refining. It also helped in providing specific guidance in our recommendations for improvements prior to deployment.","PeriodicalId":189860,"journal":{"name":"2017 25th International Conference on Software, Telecommunications and Computer Networks (SoftCOM)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127250931","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}