In this paper we propose a model for interactive, collaborative and creative multimedia distance learning in mCloud which goes beyond the existing solutions and provides personalized delivery of multimedia learning content. Our empirical results confirm that the larger groups of students and their usage of Web and mCloud lead to higher creativity of the students.
{"title":"Model for interactive, collaborative and multimedia mobile learning environment","authors":"D. Davcev, Aleksandar Karadimce","doi":"10.1145/2536853.2536913","DOIUrl":"https://doi.org/10.1145/2536853.2536913","url":null,"abstract":"In this paper we propose a model for interactive, collaborative and creative multimedia distance learning in mCloud which goes beyond the existing solutions and provides personalized delivery of multimedia learning content. Our empirical results confirm that the larger groups of students and their usage of Web and mCloud lead to higher creativity of the students.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133941592","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}
Danish Sattar, T. Sheltami, A. Mahmoud, E. Shakshuki
Time synchronization plays an important role in distributed systems. Distributed wireless sensor networks (WSN) often require accurate time synchronization for coordination and data reliability. But precision of time synchronization is limited to scope and criticality of the application. Energy, lifetime and time synchronization are important parameters of any wireless sensor network. Flooding Time Synchronization Protocol (FTSP) and Recursive Time Synchronization Protocol (RTSP) are two state of the art protocols for time synchronization in WSNs. In this paper, a comparative analysis of both protocols under two different topologies i.e. bus and tree, using message count as performance parameter. Xbee Pro and Arduino Mega are used for communication and logical design implementation of both protocols, respectively.
{"title":"A Comparative Analysis of Flooding Time Synchronization Protocol and Recursive Time Synchronization Protocol","authors":"Danish Sattar, T. Sheltami, A. Mahmoud, E. Shakshuki","doi":"10.1145/2536853.2536945","DOIUrl":"https://doi.org/10.1145/2536853.2536945","url":null,"abstract":"Time synchronization plays an important role in distributed systems. Distributed wireless sensor networks (WSN) often require accurate time synchronization for coordination and data reliability. But precision of time synchronization is limited to scope and criticality of the application. Energy, lifetime and time synchronization are important parameters of any wireless sensor network. Flooding Time Synchronization Protocol (FTSP) and Recursive Time Synchronization Protocol (RTSP) are two state of the art protocols for time synchronization in WSNs. In this paper, a comparative analysis of both protocols under two different topologies i.e. bus and tree, using message count as performance parameter. Xbee Pro and Arduino Mega are used for communication and logical design implementation of both protocols, respectively.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127828092","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}
Mobile phones are increasingly leveraged as sensor platforms to collect information about user's context. The collected sensor readings can however reveal personal and sensitive information about the users and hence put their privacy at stake. In prior work, we have proposed different user interfaces allowing users to select the degree of granularity at which the sensor readings are shared in order to protect their privacy. In this paper, we aim at further increasing user awareness about potential privacy risks and investigate the introduction of picture-based warnings based on their current privacy settings. Depending on their privacy conception and the proposed warnings, users can then adapt their settings or leave them unchanged. We evaluate the picture-based warnings by conducting a user study involving 30 participants. The results show that more than 70% of the participants would change their settings after having seen the picture-based warnings.
{"title":"Raising User Awareness about Privacy Threats in Participatory Sensing Applications through Graphical Warnings","authors":"D. Reinhardt, Martin Michalak, M. Hollick","doi":"10.1145/2536853.2536861","DOIUrl":"https://doi.org/10.1145/2536853.2536861","url":null,"abstract":"Mobile phones are increasingly leveraged as sensor platforms to collect information about user's context. The collected sensor readings can however reveal personal and sensitive information about the users and hence put their privacy at stake. In prior work, we have proposed different user interfaces allowing users to select the degree of granularity at which the sensor readings are shared in order to protect their privacy. In this paper, we aim at further increasing user awareness about potential privacy risks and investigate the introduction of picture-based warnings based on their current privacy settings. Depending on their privacy conception and the proposed warnings, users can then adapt their settings or leave them unchanged. We evaluate the picture-based warnings by conducting a user study involving 30 participants. The results show that more than 70% of the participants would change their settings after having seen the picture-based warnings.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127249519","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}
A. Liotta, D. Mocanu, Vlado Menkovski, L. Cagnetta, Georgios Exarchakos
Monitoring and controlling the user's Quality of Experience (QoE) in modern video services is a challenging proposition, mainly due to the limitations of current video quality assessment algorithms. While subjective QoE methods would better reflect the nature of human perception, these are not suitable in real-time automation cases. On the other hand, the existing objective algorithms are either too complex or too inaccurate, particularly in the context of lightweight devices such as camera sensors or smart phones. This paper introduces a novel objective QoE algorithm, Instantaneous Video Quality Assessment (IVQA), that is comparably as accurate as the most heavyweight algorithm available in the literature but can also be run in real-time. This approach is tested against a selection of ten objective metrics and benchmarked with a subjective user dataset.
{"title":"Instantaneous Video Quality Assessment for lightweight devices","authors":"A. Liotta, D. Mocanu, Vlado Menkovski, L. Cagnetta, Georgios Exarchakos","doi":"10.1145/2536853.2536903","DOIUrl":"https://doi.org/10.1145/2536853.2536903","url":null,"abstract":"Monitoring and controlling the user's Quality of Experience (QoE) in modern video services is a challenging proposition, mainly due to the limitations of current video quality assessment algorithms. While subjective QoE methods would better reflect the nature of human perception, these are not suitable in real-time automation cases. On the other hand, the existing objective algorithms are either too complex or too inaccurate, particularly in the context of lightweight devices such as camera sensors or smart phones. This paper introduces a novel objective QoE algorithm, Instantaneous Video Quality Assessment (IVQA), that is comparably as accurate as the most heavyweight algorithm available in the literature but can also be run in real-time. This approach is tested against a selection of ten objective metrics and benchmarked with a subjective user dataset.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121471696","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}
Inter-frequency small cell deployments on hotspot locations are seen as a potential solution to offload macro user traffic to small cells. In order to discover inter-frequency small cells, macro user equipments (UE) are required to perform gap-assisted measurement. The currently existing short measurement periods can increase offloading, but at low UE speeds, it leads to unnecessarily measurement to scan neighbor cells and results in waste of UE battery. Long measurement periods are discussed in 3GPP to reduce UE power consumption. However, due to long measurement periods and consequently delayed cell discovery, inter-frequency mobility and offloading performance are degraded, especially at UE high speeds. In this paper, it is shown using simulation that mobility performance and the small cell dwelling time are degraded at high UE speeds when adopting the long measurement periods. Based the simulation results, it is proposed that applying the long measurement period is effective for low mobility UE to reduce the UE power consumption while keeping the acceptable handover failure rate and the offloading performance.
{"title":"Measurement of Inter-Frequency Small Cell in Heterogeneous Networks","authors":"Hyung-Deug Bae, Jae-Wook Shin, Pyeong-jung Song","doi":"10.1145/2536853.2536919","DOIUrl":"https://doi.org/10.1145/2536853.2536919","url":null,"abstract":"Inter-frequency small cell deployments on hotspot locations are seen as a potential solution to offload macro user traffic to small cells. In order to discover inter-frequency small cells, macro user equipments (UE) are required to perform gap-assisted measurement. The currently existing short measurement periods can increase offloading, but at low UE speeds, it leads to unnecessarily measurement to scan neighbor cells and results in waste of UE battery. Long measurement periods are discussed in 3GPP to reduce UE power consumption. However, due to long measurement periods and consequently delayed cell discovery, inter-frequency mobility and offloading performance are degraded, especially at UE high speeds. In this paper, it is shown using simulation that mobility performance and the small cell dwelling time are degraded at high UE speeds when adopting the long measurement periods. Based the simulation results, it is proposed that applying the long measurement period is effective for low mobility UE to reduce the UE power consumption while keeping the acceptable handover failure rate and the offloading performance.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"46 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114060197","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}
This paper describes a new method of music data retrieval. Proposed method provides a way to determine tune's internal homogeneity, which means detecting which parts of the tune sound typical to whole tune and which do not. Such information can be used for various purposes such as tune thumbnail creation or tune cleaning from untypical parts for further automatic analysis. In our method, we slice music piece into frames and compare these frames with the whole tune by means of Instantaneous Frequency Spectrum, which gives a comprehensive approximation of frames homogeneity. This approximation is then iteratively refined. The final result shows homogeneity of short frames to the whole tune. By setting different thresholds we can get desired level of accuracy. However, proposed automatic threshold shows good results throughout all experiments. Visual presentation of tune homogeneity gives a good description of a piece's internal structure.
{"title":"Music Homogeneity Analysis through Instantaneous Frequencies","authors":"Tatiana Endrjukaite, Y. Kiyoki","doi":"10.1145/2536853.2536894","DOIUrl":"https://doi.org/10.1145/2536853.2536894","url":null,"abstract":"This paper describes a new method of music data retrieval. Proposed method provides a way to determine tune's internal homogeneity, which means detecting which parts of the tune sound typical to whole tune and which do not. Such information can be used for various purposes such as tune thumbnail creation or tune cleaning from untypical parts for further automatic analysis. In our method, we slice music piece into frames and compare these frames with the whole tune by means of Instantaneous Frequency Spectrum, which gives a comprehensive approximation of frames homogeneity. This approximation is then iteratively refined. The final result shows homogeneity of short frames to the whole tune. By setting different thresholds we can get desired level of accuracy. However, proposed automatic threshold shows good results throughout all experiments. Visual presentation of tune homogeneity gives a good description of a piece's internal structure.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"61 38","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133087171","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}
This paper presents a gender recognition method by combining three types of effective features, including facial texture features, hair geometry features, and mustache features. The recognition method includes two phases which are based on the AdaBoost algorithm. In the first phase, facial and hair features are extracted from a face image and then fed into a classifier to roughly classify the image into male and female classes. In the second phase, the mustache features are added into the feature vector of the female patterns which classified into female class in the first phase. The female patterns are then classified again to correct the misclassified patterns. The FERET database is used to evaluate our method in the experiment. In the FERET data set, 659 images are chosen in which 366 of them are used as training data and the rest are regarded as test data. The best classification rate of the proposed method achieves 96.25%.
{"title":"Gender Recognition Based On Combining Facial and Hair Features","authors":"Chien-Cheng Lee, Chung-Shun Wei","doi":"10.1145/2536853.2536933","DOIUrl":"https://doi.org/10.1145/2536853.2536933","url":null,"abstract":"This paper presents a gender recognition method by combining three types of effective features, including facial texture features, hair geometry features, and mustache features. The recognition method includes two phases which are based on the AdaBoost algorithm. In the first phase, facial and hair features are extracted from a face image and then fed into a classifier to roughly classify the image into male and female classes. In the second phase, the mustache features are added into the feature vector of the female patterns which classified into female class in the first phase. The female patterns are then classified again to correct the misclassified patterns. The FERET database is used to evaluate our method in the experiment. In the FERET data set, 659 images are chosen in which 366 of them are used as training data and the rest are regarded as test data. The best classification rate of the proposed method achieves 96.25%.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133647697","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}
This paper deals with the LTE downlink transmission scheme, from the base station to the terminal (the mobile phone), which is based on multicarrier modulation: OFDM (Orthogonal Frequency Division Multiplexing). LTE also supports the use of multiple antennas at both the base station and the terminal to improve communication performance: Multiple Input -- Multiple Output (MIMO) antenna processing. The project focuses on the different methods for estimating the time-varying channel between the transmitter and the receiver: to carry out coherent demodulation, the mobile terminal requires estimates of the downlink channel, and to allow this, known symbols are inserted in the transmitted signal.
本文研究了基于多载波调制OFDM (Orthogonal Frequency Division Multiplexing)的LTE下行传输方案，即从基站到终端(手机)的传输。LTE还支持在基站和终端使用多天线来提高通信性能:多输入多输出(MIMO)天线处理。该项目侧重于估计发射器和接收器之间时变信道的不同方法:为了进行相干解调，移动终端需要估计下行信道，为了实现这一点，在发射信号中插入已知符号。
{"title":"Channel estimation algorithms for MIMO-OFDM systems (LTE standard)","authors":"A. Laraki, D. E. Ouadghiri, A. Jamali","doi":"10.1145/2536853.2536906","DOIUrl":"https://doi.org/10.1145/2536853.2536906","url":null,"abstract":"This paper deals with the LTE downlink transmission scheme, from the base station to the terminal (the mobile phone), which is based on multicarrier modulation: OFDM (Orthogonal Frequency Division Multiplexing). LTE also supports the use of multiple antennas at both the base station and the terminal to improve communication performance: Multiple Input -- Multiple Output (MIMO) antenna processing.\u0000 The project focuses on the different methods for estimating the time-varying channel between the transmitter and the receiver: to carry out coherent demodulation, the mobile terminal requires estimates of the downlink channel, and to allow this, known symbols are inserted in the transmitted signal.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115747031","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}
Paolo Pilloni, F. Mulas, Luisella Piredda, S. Carta
In the last years, researchers are experimenting with innovative methodologies to help people in their daily training routines. Our research activity focuses on the study of the effects of the former technologies on people's sport habits. This work describes an experimentation conducted on Everywhere Run! (EWRun), a mobile application part of a bigger platform, that aims at helping people to stay active behaving like a virtual personal trainer. In this work we show some interesting results that arise from recent radical changes we made to the software usability and its graphical design. We observed a considerable increment of the user base and, as a consequence, of the total number of daily trainings. To statistically prove the effectiveness of the redesign, we decided to compare the two versions of the application. The results confirm its effectiveness in terms of usability and brought us to investigate how the new design is affecting user motivation by means of a custom questionnaire and a well known motivation assessment tool. The positive result observed will be the starting point of our forthcoming researches: we aim at further validating the results presented in this work over a longer period of time and over a larger number of real users.
{"title":"Assessing the User Experience Design as a Persuasive Methodology in a Real World Sport Application","authors":"Paolo Pilloni, F. Mulas, Luisella Piredda, S. Carta","doi":"10.1145/2536853.2536874","DOIUrl":"https://doi.org/10.1145/2536853.2536874","url":null,"abstract":"In the last years, researchers are experimenting with innovative methodologies to help people in their daily training routines. Our research activity focuses on the study of the effects of the former technologies on people's sport habits. This work describes an experimentation conducted on Everywhere Run! (EWRun), a mobile application part of a bigger platform, that aims at helping people to stay active behaving like a virtual personal trainer. In this work we show some interesting results that arise from recent radical changes we made to the software usability and its graphical design. We observed a considerable increment of the user base and, as a consequence, of the total number of daily trainings. To statistically prove the effectiveness of the redesign, we decided to compare the two versions of the application. The results confirm its effectiveness in terms of usability and brought us to investigate how the new design is affecting user motivation by means of a custom questionnaire and a well known motivation assessment tool. The positive result observed will be the starting point of our forthcoming researches: we aim at further validating the results presented in this work over a longer period of time and over a larger number of real users.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116177509","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}
S. Verstockt, Viktor Slavkovikj, P. D. Potter, Baptist Vandersmissen, Jürgen Slowack, R. Walle
In this paper, we describe a novel approach for the automatic generation of a GEO-MASHUP related to a user his outdoor activities. Each mashup consists of online geotagged media resources related to the geographic keypoints where the outdoor activity was performed. In order to detect candidate keypoints, we search low-activity locations based on the travelling distance over time. Subsequently, we filter out route-specific keypoints (such as traffic lights) using online trajectory information. Finally, the remaining keypoints are fed to a set of social media web services to retrieve the geotagged media which summarizes the user's activity. The GEO-MASHUP demonstrator, which is evaluated in real-world conditions, shows the feasibility of our novel approach.
{"title":"Automatic GEO-MASHUP generation of outdoor activities","authors":"S. Verstockt, Viktor Slavkovikj, P. D. Potter, Baptist Vandersmissen, Jürgen Slowack, R. Walle","doi":"10.1145/2536853.2536949","DOIUrl":"https://doi.org/10.1145/2536853.2536949","url":null,"abstract":"In this paper, we describe a novel approach for the automatic generation of a GEO-MASHUP related to a user his outdoor activities. Each mashup consists of online geotagged media resources related to the geographic keypoints where the outdoor activity was performed. In order to detect candidate keypoints, we search low-activity locations based on the travelling distance over time. Subsequently, we filter out route-specific keypoints (such as traffic lights) using online trajectory information. Finally, the remaining keypoints are fed to a set of social media web services to retrieve the geotagged media which summarizes the user's activity. The GEO-MASHUP demonstrator, which is evaluated in real-world conditions, shows the feasibility of our novel approach.","PeriodicalId":135195,"journal":{"name":"Advances in Mobile Multimedia","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121789389","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}
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