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Journal of Mobile Multimedia

Editor-in-Chief: Pavlos Lazaridis, University of Huddersfield, UK

ISSN: 1550-4646 (Print Version),

ISSN: 1550-4654 (Online Version)
Vol: 10   Issue: Combined Issue 1 & 2

Published In:   May 2014

Publication Frequency: Quarterly

Search Available Volume and Issue for Journal of Mobile Multimedia

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A Path-Consistency based Algorithm for Anomaly Detection of Spatial Constraints in GeoXACML Policies

Tuan Anh Dang and Tran Khanh Dang

Ho Chi Minh City University of Technology, VNUHCM

Abstract: [+]    |    Download File [ 496KB ]

Abstract: Anomaly detection in GeoXACML policies supports policy designers in the policy definition process to save effort, minimize errors, improve performance. Currently, there is a lot of research focusing on anomaly detection in XACML from which GeoXACML is extended. However, no research directly solves anomaly detection problem in GeoXACML, especially in the spatial aspect. In this paper, we propose an algorithm based on the path-consistency algorithm to detect anomalies in spatial constraints of GeoXACML policies. In our approach, when a policy designer adds a new rule or updates an existing rule, an engine will automatically check if this rule is potentially conflicting or redundant to others. We also present a simple example in step-by-step to clarify how this algorithm works. Finally, to analyze the performance of this algorithm, we will consider its computational complexity.

Keywords: GeoXACML, anomaly detection, RCC8, path-consistency algorithm.

Fault Resolution System for Inter-Cloud Environment

Ha Manh Tran1, Synh Viet Uyen Ha1, Huynh Tu Dang1 and Khoa Van Huynh2

1Computer Science and Engineering International University-Vietnam National University Ho Chi Minh City, Vietnam
2Network and Services Management VNPT Dong Thap-VNPT Group Dong Thap, Vietnam

Abstract: [+]    |    Download File [ 512KB ]

Abstract: Fault resolution in communication networks and distributed systems is a complicated process that demands the involvement of system administrators and supporting systems in monitoring, diagnosing, resolving and recording faults. This process becomes more challenging in inter-cloud environment where multiple cloud systems coordinate in provisioning applications and services. In this context, we propose a fault resolution system that assists system administrators in resolving faults in inter-cloud environment. The proposed system is characterized by the capability of sharing and searching fault knowledge resources among cloud systems for fault resolution. It uses a peer-to-peer network of fault managers that provide facilities to monitor faults occurring in cloud systems and search similar faults with solutions occurring in other cloud systems. We have implemented several components of the proposed system including fault monitor, fault searcher and fault updater. We have also experimented and evaluated the prototyping system on fault databases obtained from several fault sources, such as bug tracking systems, online discussion forums and vendor knowledge bases.

Keywords: Cloud Computing, Fault Resolution, Peer-to-Peer Network, Inter-Cloud Environment, Bug Tracking System

MDRAN: Multihop Disaster Recovery Access Network

Quang Tran-Minh1,2, Kien Ngyen2, Eiji Kamioka3 and Shigeki Yamada1

1National Institute of Informatics, Tokyo, Japan
2Hochiminh City University of Technology, Hochiminh, Vietnam
3Shibaura Institute of Technology, Tokyo, Japan

Abstract: [+]    |    Download File [ 374KB ]

Abstract: This paper proposed a novel approach to resilient wireless multihop disaster recovery access networks (MDRAN). Both virtual access point (VAP) and wireless virtualization (WV) techniques have been combined in an appropriate way thereby the networks can be automatically setup ondemand using on-site commodity mobile devices (laptops, tablet PCs, smart phones). In the proposed approach, difficulties remained from conventional access network technologies such as the requirements of installing special hardware (e.g. multiple network interface cards - NICs, particular mesh routers, etc.,) and software (e.g. network auto-configuration software including routing protocols) on each mobile node (MN) in advance have been resolved. As a result, users can connect to the proposed MDRAN as easily as connecting to conventional APs. After connecting to the proposed network, users naturally and unconsciously contribute to the network extension. This feature improves the self-supporting capability at the disaster's local communities. Experimental evaluations reveal the feasibility, effectiveness as well as the scalability of the proposed approach. As a result, the proposed scheme is ready to be realized in the actual disaster recovery applications.

Keywords: Resilience, Wireless virtualization, Multihop communications, Access network, Virtual access point.

Overlay upper Clothing Textures to Still Images based on Human Pose Estimation

Quang-Song Le1 and Minh-Triet Tran1

1 Cao Thang Technical College, University of Science, VNU-HCM
2 University of Science, VNU-HCM

Abstract: [+]    |    Download File [ 867KB ]

Abstract: The authors propose a system to enhance user’s experience in virtual shopping with image processing techniques. Our proposed system allows a user to submit his or her upright photo taken by any regular camera and choose a product interactively, and then the system returns an output image, which is morphed with upper clothing textures corresponding to the human pose estimated from the given photo. Our approach is based on the result of estimating upper human pose to calculate similarity scores between pairs of image poses and our simple yet efficient method to scale a texture image of an upper clothing product to an appropriate size for morphing. From our study on various magazines and websites of fashion, we define 16 common types of human poses. We create a dataset with 390 photos taken in studios for many products in various poses which cover the 16 defined common poses to train and test our proposed virtual dressing room. Experiments with 12 volunteers to evaluate 150 result images from 50 user images in our system show that 89% of the overlaid output images of the system have good evaluation results. Our proposed system not only enhances users’ experience but also helps users save time with a virtual dressing system before they decide to purchase upper clothing products.

Keywords: Articulated human pose estimation, virtual clothing, texture mapping, morphing.

Study of VDTN Routing Protocols Performances in Sparse and Dense Traffic in the Presence of Relay Nodes

Maria Benamar1, Sara Ahnana1, Fatima Zahrae Saiyari1, Nabil Benamar1, Moulay Driss El Ouadghiri1 and Jean-Marie Bonnin 2

1MACS Laboratory, Faculty of sciences, Meknes, Morocco
2Telecom Bretagne, Rennes, France

Abstract: [+]    |    Download File [ 446KB ]

Abstract: Vehicular Delay Tolerant Networks (VDTN) are growing challenging field of Delay Tolerant Networks (DTN) containing mobile nodes (vehicles) that communicate using the paradigm of store carry and forward. In this model, nodes store the bundle waiting for the opportunity to transfer it to another node in the same transmission range, and in a limited duration. VDTN enables communications in a sparse network characterized by low density, high mobility of nodes, intermittent connectivity, no end-to-end communication and no information on the path of nodes, which make routing in such cases difficult and challenging. This paper studies the performances of some well-known VDTN routing protocols in sparse and dense traffic. The proposed scenario considers stationary nodes representing sensors measuring different types of data to be transferred to stationary destination nodes through the VDTN network (vehicles). The destination nodes are the only part of the network that is connected to the Internet. The transmission of collected data is also made by fixed nodes representing stationary relays such as audiosignal traffic lights, placed in the crossroads of Rennes city streets. The map of Rennes has been used and the position of the stoplights has been carried out using Open Data. The aim of our simulation is to study the impact of mobile nodes and stationary relays on the routing protocols performances in dense and sparse traffic.

Keywords: Vehicular Delay-Tolerant Networks, Routing, Relay, Performance Evaluation, ONE

Improving Delay Performance for Time-Critical Communications in VANET

Dong Lai Sun1, Hafssa Benaboud2, Jianhua Li3 and Noufissa Mikou4

1SEIEE, Shanghai Jiao Tong University, Shanghai, China
2LRI, Performance Evaluation Team, Faculty of Sciences University Mohammed V-Agdal, Rabat, Morocco
3SEIEE, Shanghai Jiao Tong University, Shanghai, China
4LE2i, University of Bourgundy Dijon, France

Abstract: [+]    |    Download File [ 658KB ]

Abstract: To ensure the functionality of intelligent transportation, time-critical information is of great importance in Vehicular Ad-hoc Network (VANET). Meanwhile, non-time-critical information still exists in the network, with which regular services can be provided. A key problem in VANET is to guarantee delay performance for time-critical tra.c while still satisfying demand of non-time-critical tra.c. To achieve this object, a multiple threshold policy derived from TEOS (Threshold Enabled Opportunistic Scheduling) is studied in this paper. With this policy, overall channel e.ciency is optimized while a throughput requirement from the non-time-critical tra.c is still considered. Thus, two objects can be achieved simultaneously: time-critical packets can have a better channel access probability as a result of a more free channel; and non-time-critical tra.c can be transmitted as required. Numerical results and simulations show that this approach can provide smaller delay for time-critical transmissions in VANET.

Keywords: Time-Critical Communications, opportunistic scheduling, VANET, TEOS

Geo-Social Mobility Model for VANET Simulation

Nardine Basta1, Amal El-Nahas2, Hans-Peter Grossmann1 and Slim Abdennadher3

1Institute of Communications Engineering, University of Ulm
2Alexandria University / The German University in Cairo
3The German University in Cairo

Abstract: [+]    |    Download File [ 285KB ]

Abstract: Vehicular Ad Hoc Network (VANET) can be viewed as a special case of an ad hoc net- work formed by moving vehicles communicating through short-to-medium range wireless transmission. This emerging wireless technology allowed for a wide range of applications varying from safety and accident avoidance to leisure and entertainment. The VANET’s special features, such as high node mobility, made the design and validation of its pro- tocols a challenging task. A realistic simulation environment is then required. Since the vehicles mobility is driven by the human mobility characteristics and is controlled by the geographical restrictions of the roads, the work presented in this paper is aimed to having a realistic mobility model that incorporates both the social aspects of human mobility together with the geographical restrictions that governs the movement of the mobile nodes. The model is based on using realistic data sets rather than randomly generated data.

Keywords: VANET, Mobility Model, Social Network

An In-Vehicle Embedded System for CAN-bus Events Monitoring

Shichao Cai1, Mohamed Bakhouya2, Mohamed Becherif3, Jaafar Gaber4 and Maxime Wack4

1China HUANQIU Contracting & Engineering CORP
2International University of Rabat, Morocco
3FCLab FR CNRS 3539, Femto-ST UMR CNRS 6174
4SET, University of Technology Belfort-Montbeliard, 90010 Belfort Cedex, France

Abstract: [+]    |    Download File [ 773KB ]

Abstract: ITS applications usually involve inter-vehicle communication as a medium to exchange information between vehicles experiencing undesirable and/or dangerous situations (e.g., traffic jam, accident, or bad road conditions) and other surrounding vehicles. For example, if the in-vehicle ABS is activated, it might indicate bad road conditions, and if this information is shared between vehicles, other drivers will be warned to take preventive actions before getting into a dangerous situation. In this paper, an embedded system is presented for in-vehicle event monitoring. The system uses a diagnostic interface to plug into the vehicle’s existing network (i.e. CAN bus) and a software is integrated to extract relevant information. Wireless communication modules, mainly WLAN, ZigBee and GPS/GPRS, are integrated into the system to communicate with other surrounding vehicles as well as emergency/control centers. A prototype is developed and deployed in a real vehicle, experiments are conducted, and results are reported to show the efficiency of the system and the soundness of gathered in-vehicle data.

Keywords: In-Vehicle embedded systems, Inter-Vehicle communication, ITS context-aware applications, On-board sensors and CAN bus.

Field Measurements of an Urban Two-Tier Wireless Mesh Access Network: End-User Perspective

Driss Benhaddou and Julian Naranjo

University of Houston, TX, USA

Abstract: [+]    |    Download File [ 1148KB ]

Abstract: Multi-tier wireless mesh networks are promising technologies that are deployed to provide economic high speed Internet access. In an effort to provide low-cost broadband Internet access to a low income neighborhood in Southeast Houston, Rice University and Technology for All (TFA) organization deployed a multi-tier mesh Wi-Fi Network that extends a single fiber-optic channel to serve a large coverage area. The access tier connects homes to the nearest Wi-Fi Mesh Access Point (MAP); several MAPs are installed in specific locations for complete coverage of the neighborhood. The MAPs form a multi-hop wireless network to the fiber back-haul. This paper presents an extensive in-home performance measurement of the TFA network to characterize the network performance from user perspective. The results show that the current design need improvement to fulfill user expectation and implementation of wireless mesh network as an access technology for end-users’ broadband access. In addition the paper simulates the effect of directional antenna on the design of such network.

Keywords: Wireless Mesh Network, Field measurements, Received Signal Strength Indicator

Design of Disaster State Presentation System Using Ultra High Resolution Display

Akira Sakuraba1, Tomoyuki Ishida2, Yasou Ebara3 and Yoshitaka Shibata4

1Iwate Prefectural University, Takizawa-vil., Iwate-pref., JAPAN
2Ibaraki University, Hitachi-city, Ibaraki-pref., JAPAN
3Osaka University, Ibaraki-city, Osaka-pref., JAPAN
4Iwate Prefectural University, Takizawa-vil., Iwate-pref., JAPAN

Abstract: [+]    |    Download File [ 1875KB ]

Abstract: Management of disaster information is identified as one of the important functions in disaster countermeasure activity once large scale disaster has broken out. Since a large number of disaster information regarding with damage state in aftermath phase are reported to Counter Disaster headquarter (CDH), officers of CDH have to consolidate those to understand the state and to do decision making for quick and correct activity. In conventional, printed large maps are used for disaster management. However, the printed maps are disadvantage because a rapid and flexible reflection of disaster association between the damage state and geographical location cannot be easily attained. On the other hand, a GIS based disaster information system which represents disaster information on a standard display device is proposed and used for small number of disaster officers with relatively small scale of disasters. In this paper we propose LIVEwall by tiled displayed System based presentation and sharing platform for a large disaster case. Our system provides aggregated functions which can visually overlay the damage information on digital map for decision making in the disaster case. The damage state is managed and consolidated and displayed on the digital map on each CDH in local governments. In addition, we propose a shared workspace on the unified shared display device to show both the detail of indicated object and the perspicuity of whole wide area. We consider various interactions between users and tiled display system for both within the same CDH and inter-CDHs as design concept.

Keywords: Tiled display wall, Disaster Countermeasure Operation, GIS, Disaster Information

River Publishers: Journal of Mobile Multimedia