Wireless Sensor Networks (WSN) are planned to be deployed in critical applications like border surveillance, monitoring physical and chemical environmental phenomena, intelligent agriculture and personal healthcare. T...
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ISBN:
(纸本)9781424417964
Wireless Sensor Networks (WSN) are planned to be deployed in critical applications like border surveillance, monitoring physical and chemical environmental phenomena, intelligent agriculture and personal healthcare. Theses days, researchers' vision is to implant sensor nodes in the human body, which will monitor the biological parameters and report them to the patient and the doctor, when abnormalities are detected. However, due to the criticality of these applications a thorough evaluation of the existing standards and technologies for suitability is needed. This paper evaluates the existing technologies and standards designed for sensor networks from the perspective of a personal healthcare system. The main focus of this paper is to evaluate the power efficiency of the node and the channel reuse factor in different conditions. Proposals are also made towards improving the weaknesses.
To measure a vehicle39;s lateral position relative to the lane of the road a low cost system can be developed to measure it. While operating the system during day and night it has the capability to track white or or...
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ISBN:
(纸本)9781424417964
To measure a vehicle's lateral position relative to the lane of the road a low cost system can be developed to measure it. While operating the system during day and night it has the capability to track white or orange lines, solid or dashed edge lines. The system is comprised of two "off the shelf "black and white charge coupled devices (CCD) video cameras along with commonly available electronic components. The lane system is capable of outputting real time data at 30 Hz through an analog output. Using the data from this sensor system it is possible to detect the lane changes, determines the magnitude, duration of lane exceedance and other metrics used by researchers in transportation community. This paper will discuss the design and performance of the system, processing of raw lane trackers data, and benefits and limitations of the technology.
In our previous work [1], we have analysed Multiuser Interference (MUI) by considering synchronous and asynchronous transmission under multiuser case for DS-CDMA based OFDM system. In [1] we have considered MUI at rec...
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ISBN:
(纸本)9781424417964
In our previous work [1], we have analysed Multiuser Interference (MUI) by considering synchronous and asynchronous transmission under multiuser case for DS-CDMA based OFDM system. In [1] we have considered MUI at receiver from NI active users. In this paper we have examine MUI by considering packet based transmission with Impulse radio. In this situation MUI is generated due to collision of UWB pulses, which are used to define single bit under UWB transmission. This type of interference will take place in UWB based network due to organization of information bits into packets by higher layers. Here we have considered the TH-PAM and TH-PPM based Impulse radio systems for evaluating MUI.
In the evolving ubiquitous Internet landscape, users are willing to play a more central role by modeling and reshaping the Web experience upon their needs. They begin perceiving and exploiting the Web as a platform to...
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ISBN:
(纸本)9781424417964
In the evolving ubiquitous Internet landscape, users are willing to play a more central role by modeling and reshaping the Web experience upon their needs. They begin perceiving and exploiting the Web as a platform to collaboratively create and share contents and to communicate with each other. Moreover, they want to decide how to access services and contents, freeing themselves from traditional fixed PCs and adopting heterogeneous wireless devices such as palmtops, smartphones, wireless-enabled portable audio players and so on. The Internet of Services scenario stresses several research fields, from multimodality to mobility, from context awareness to service orientation and coordination. Research achievements, anyway, often tend to evolve separately, leading to ad-hoc solutions for specific sets of problems. We strongly believe that such evolving scenarios require a comprehensive support platform: this paper promotes a novel service-oriented middleware to assist users in the pervasive ubiquitous Internet access. The use cases we describe focus on complex scenarios that, in our opinion, will likely be more and more required in the next years.
In the coming NGN (Next Generation Network) era, a mobile end user desires not only the service accessibility anywhere, but also personalized services adapted to any device, network, and user39;s context about locat...
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ISBN:
(纸本)9781424417964
In the coming NGN (Next Generation Network) era, a mobile end user desires not only the service accessibility anywhere, but also personalized services adapted to any device, network, and user's context about location and activity. How to offer optimized user centric services, meanwhile mask the complexity, which is caused by the heterogeneity of the environment and the mobility, becomes our challenge. The goal of our solution is to propose an innovative user centric middleware (Userware) enhancing the seamless feasibility along with the location and activity, personalization and user's ambient contexts. We propose in this article, first, a decisional knowledge base (Infosphere) managing, in the real time, all the personalization and ambient environment information. An information inference (AmbientGrid) basing on the profiles' matching, is then proposed to be structured with grid covering the needed user centric environment. We introduce our experimentation and finish the article with a conclusion and perspective.
Today39;s softwaresystems are increasingly required to be flexible which is achieved by providing various forms of loose coupling and configuration options. While loose coupling and configuration options facilitate...
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ISBN:
(纸本)9781450357296
Today's softwaresystems are increasingly required to be flexible which is achieved by providing various forms of loose coupling and configuration options. While loose coupling and configuration options facilitate quick adaptation to changing requirements, such flexibility increases the difficulty of system testing. It is often relatively straight-forward to create different configuration options as test cases, but it is typically much more difficult to formulate the expected system behavior, which is known as the oracle problem. NASA's GMSEC software bus is such a flexible system that serves as a central communication channel for software components based on a publish and subscribe architecture where several software components can be dynamically connected to the system. To cope with the difficulties in testing such a flexible softwaresystem, we present a metamorphic testing approach that explicitly addresses the test oracle problem. In this paper, we focus on testing the publish and subscribe functionality of GMSEC motivated by the fact that its middleware-based system architecture is the foundation of many of NASA's missions.
Most applications of wireless sensor networks require that the sensor nodes be location-aware. Finding location without the aid of GPS in each node of a sensor network is important in cases where GPS is either not acc...
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ISBN:
(纸本)9781424417964
Most applications of wireless sensor networks require that the sensor nodes be location-aware. Finding location without the aid of GPS in each node of a sensor network is important in cases where GPS is either not accessible, or not practical to use due to power, form factor or line of sight conditions. In many cases, range-based localization schemes not feasible due to hardware cost and resource restriction of the sensor nodes. As cost-efficient solutions, range-free localization schemes are quite attractive for large-scale networks. We designed a novel range-free, neighbor-information-based localization system (NBLS) which takes neighbor information into account besides hop information used in DV-Hop. It is shown that our NBLS outperforms DV-Hop and HCRL scheme significantly in terms of the average localization error when the topology of network is irregular. Even if network topology is grid, NBLS performs better than the other two schemes.
The Biometric based user authentication systems are highly secured and efficient to use and place total trust on the authentication server where bio-metric verification data are stored in a central database. Such syst...
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ISBN:
(纸本)9781424417964
The Biometric based user authentication systems are highly secured and efficient to use and place total trust on the authentication server where bio-metric verification data are stored in a central database. Such systems are, prone to dictionary attacks initiated at the server side. Compromise of the authentication server by either outsiders or insiders do all user private data to exposure and may have serious repercussions to an organization. In this paper, we present a practical fingerprint based user authentication and key exchange system employing a novel two-server architecture. Here, we make use of Image processing techniques to extract a biometric measurement from fingerprint image. In this system, only a front-end service server engages directly with users while a control server stays behind the scene;therefore, can be directly applied to strengthen existing single-server biometric systems without requiring additional computation by the users. In addition, the system is secure against offline dictionary attacks mounted by either of the two servers.
Medium Access Control (MAC) entity forms the most important part of any high speed packet access system. Complying with the high data rate requirements, MAC Layer requires a highly efficient Scheduler algorithm workin...
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ISBN:
(纸本)9781424417964
Medium Access Control (MAC) entity forms the most important part of any high speed packet access system. Complying with the high data rate requirements, MAC Layer requires a highly efficient Scheduler algorithm working in tandem with the Flow Control, buffer utilization, access terminal's capability and with Channel Quality requirements. The MAC entity mainly consists of the Flow Control Engine, Buffer Management, Scheduler, Encoder and HARQ process that together provide a steady packet flow to the physical layer. In this paper, we study the new design methodology for MAC layer's based on the modified Opportunistic Proportionate Fairness Scheduler (OPTS) 12 algorithm which dynamically adapts the Transport Format (TF) Selection either based on legacy algorithm or access terminal's feedback taking stress condition in the system, balancing Proportionate and Priority factor dynamically per scheduling cycle, providing the correct feedback to Flow Control and the HARQ retransmission process. MAC calculates the weighted capability per queue per user depending on the retransmission, actual buffer occupancies, dynamic token value, Traffic Class Priority, as well as in varying channel conditions and sends the selected queue to the physical layer.
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