Scientific Research Publishing

Displaying 1-40 of 353 results

  • White Papers // May 2015

    Predictive Prefetching for Parallel Hybrid Storage Systems

    In this paper, the authors present a predictive prefetching mechanism that is based on probability graph approach to perform prefetching between different levels in a parallel hybrid storage system. The fundamental concept of their approach is to invoke parallel hybrid storage system's parallelism and pre-fetch data among multiple storage levels...

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  • White Papers // May 2015

    Hybrid Data Mining Models for Predicting Customer Churn

    The term "Customer churn" is used in the industry of Information and Communication Technology (ICT) to indicate those customers who are about to leave for a new competitor or end their subscription. Predicting this behavior is very important for real-life market and competition and it is essential to manage it....

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  • White Papers // Apr 2015

    Research of Big Data Based on the Views of Technology and Application

    In the era of big data, large amounts of data affect the authors' work, life and study, even national economic development. It provides a new way of thinking and approaches to analyze and solve problems, which gradually becomes a hot research. Based on describing the concept and characteristics of big...

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  • White Papers // Apr 2015

    Ensuring Security, Confidentiality and Fine-Grained Data Access Control of Cloud Data Storage Implementation Environment

    With the development of cloud computing, the mutual understandability among distributed data access control has become an important issue in the security field of cloud computing. To ensure security, confidentiality and fine-grained data access control of Cloud Data Storage (CDS) environment, the authors proposed Multi-Agent System (MAS) architecture. This architecture...

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  • White Papers // Apr 2015

    The IRIS Development Platform and Proposed Object-Oriented Data Base

    Various code development platforms, such as the ATHENA framework of the ATLAS experiment encounter lengthy compilation/linking times. To augment this situation, the IRIS development platform was built as a software development framework acting as compiler, cross-project linker and data fetcher, which allow hot-swaps in order to compare various versions of...

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  • White Papers // Apr 2015

    A Data-Placement Strategy Based on Genetic Algorithm in Cloud Computing

    With the development of computerized business application, the amount of data is increasing exponentially. Cloud computing provides high performance computing resources and mass storage resources for massive data processing. In distributed cloud computing systems, data intensive computing can lead to data scheduling between data centers. Reasonable data placement can reduce...

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  • White Papers // Mar 2015

    Human Resource Management in the Era of Big Data

    In the era of big data, enterprise management is undergoing tremendous changes. Human resource department, as an important part of the company, has also been affected by big data. The paper is in the context of the era of big data, discussing the application of big data in major modules...

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  • White Papers // Mar 2015

    M/G/1 Vacation Queueing Systems with Server Timeout

    In this paper, the authors consider a single-server vacation queueing system that operates in the following manner. When the server returns from a vacation, it observes the following rule. If there is at least one customer in the system, the server commences service and serves exhaustively before taking another vacation....

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  • White Papers // Mar 2015

    Analysis of O2O Model's Development Problems and Trend

    Future competition not only exists in the products and channels, but also exists in the resource integration and terminal consumers. O2O mode is new commerce model which does a deeper explore to the sales channels, and has a very good prospect. But, there are certain obstacles in its development. This...

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  • White Papers // Mar 2015

    Inferring Locations of Mobile Devices from Wi-Fi Data

    Mobile phones are becoming a primary platform for information access. A major aspect of ubiquitous computing is context-aware applications which collect information about the environment that the user is in and use this information to provide better service and improve user experience. Location awareness makes certain applications possible, e.g., recommending...

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  • White Papers // Mar 2015

    Comparative Analysis of Operating System of Different Smart Phones

    Now-a-days, rapidly increasing technology is mobile phone technology in telecommunication sector. This mobile device technology has great effect on everyone's life. This technology has reduced the burden of people in their daily life. To manage the rising demand for such mobile devices, numerous operating systems came in the market as...

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  • White Papers // Mar 2015

    Electricity Logistics Storage Integration System Research

    With the booming of e-commerce business and high requirement of customer, the operation mode of e-commerce distribution center is changing. Automation equipment cannot be utilized fully due to the nature fact of electricity business, which can be described as small batch and high frequency. In this paper, the authors put...

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  • White Papers // Feb 2015

    A MATLAB-Based Numerical and GUI Implementation of Cross-Gradients Joint Inversion of Gravity and Magnetic Data

    "The cross-gradients joint inversion technique has been applied to multiple geophysical data with a significant improvement on compatibility, but its numerical implementation for practical use is rarely discussed in the literature. The authors present a MATLAB-based three-dimensional cross-gradients joint inversion program with application to gravity and magnetic data. The input...

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  • White Papers // Feb 2015

    Formalization of Federated Schema Architectural Style Variability

    "Data integration requires managing heterogeneous schema information. A federated database system integrates heterogeneous, autonomous database systems on the schema level, whereby both local applications and global applications accessing multiple component database systems are supported. Such a federated database system is a complex system of systems which requires a well-designed organization...

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  • White Papers // Feb 2015

    Semantic Enrichment of XML Schema to Transform Association Relationships in ODL Schema

    "In this paper, the authors present an approach for transforming an XML schema they enriched in ODL (Object Definition Language) schemas. It is possible to realize the concepts of ODL in a model of XML schema; they propose to introduce an enrichment concretizing these concepts in the XML schema models....

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  • White Papers // Feb 2015

    Content-Based Image Retrieval Using SOM and DWT

    "Content-Based Image Retrieval (CBIR) from a large database is becoming a necessity for many applications such as medical imaging, Geographic Information Systems (GIS), space search and many others. However, the process of retrieving relevant images is usually preceded by extracting some discriminating features that can best describe the database images....

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  • White Papers // Feb 2015

    Timed-Automata Based Model-Checking of a Multi-Agent System: A Case Study

    "A multi-agent based transport system is modeled by timed automata model extended with clock variables. The correctness properties of safety and liveness of this model are verified by timed automata based UPPAAL. Agents have a degree of control on their own actions, have their own threads of control, and under...

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  • White Papers // Feb 2015

    Towards Designing an Intelligent Educational Assessment Tool

    "Assessment is an important part of learning process. It can be defined as the process of gathering information for the purpose of making judgments about a current state of affairs presumably for the purpose of enhancing future outcomes. It determines whether or not the goals of education are being met....

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  • White Papers // Feb 2015

    PPP Accuracy Enhancement Using GPS/GLONASS Observations in Kinematic Mode

    Commonly, kinematic PPP techniques employ un-differenced ionosphere free linear combination of GPS observations. This, however, may not provide continuous solution in urban areas as a result of limited satellite visibility. In this paper, the traditional un-differenced as well as Between-Satellite Single-Difference (BSSD) ionosphere-free linear combinations of GPS and GLONASS measurements...

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  • White Papers // Jan 2015

    E-Learning Optimization Using Supervised Artificial Neural-Network

    "Improving learning outcome has always been an important motivating factor in educational inquiry. In a blended learning environment where e-learning and traditional face to face class tutoring are combined, there are opportunities to explore the role of technology in improving student's grades. A student's performance is impacted by many factors...

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  • White Papers // Jan 2015

    How Framing Effect Impact on Decision Making on Internet Shopping

    Framing effect is an understanding and assessment that individual implements different behaviors when facing to the multiple choice that expressing the same meaning. Previously, scholars went through numerous empirical studies regarding impact of the method as well as environment in making decision of online purchasing. Also, scholars have proved that...

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  • White Papers // Jan 2015

    The Impact of Brand Image on Consumer Behavior: A Literature Review

    The concept "Brand image" has drawn significant attention from academics and practitioners since it was put forward, because it played an important role in marketing activities. Although, brand image was recognized as the driving force of brand asset and brand performance, few studies have elaborated on the relationship between brand...

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  • White Papers // Jan 2015

    An Experiment in Use of Brain Computer Interfaces for Cognitive Researches

    Human error can be defined as some undesired behaviors caused by some improprieties such as lack of knowledge, lack of communication, lack of attention, excessive stress, mental fatigue and environmental factors. Monitoring cognitive state is a useful tool to reduce these errors. Therefore, many studies about cognitive load have been...

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  • White Papers // Jan 2015

    The Construction of Human Resource Management Cloud Service Platform

    "Human resource management service faced the challenges of promoting efficiency, costs saving, quick responding and so on. In order to face these challenges, this paper puts forward a ""6 1"" structure of human resource management service combined with some characteristics of cloud computing, elaborates the service mode of the cloud...

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  • White Papers // Jan 2015

    Research on Supply Chain Simulation System Based on Internet of Things

    "As one of the top ten core industries in China, Internet of things has gradually changed the people life, by influencing enterprise production, storage and transportation, express, supermarket shopping, etc. By using Internet of things technology in the supply chain, enterprise can optimize the structure and process of supply chain...

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  • White Papers // Jan 2015

    Cell-Phone Recycling by Solvolysis for Recovery of Metals

    Mobile phones represent a significant and growing problem with respect to Electrical Waste and Electronic Equipment (EWEE). Nevertheless, they are perhaps one of the most valuable electronic products, since they are an important resource for the recovery of metals in terms of mass and volume. In paper, research a chemical...

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  • White Papers // Jan 2015

    Quantifying the Value of Open Source Hardware Development

    With the maturation of digital manufacturing technologies like 3-D printing, a new paradigm is emerging of distributed manufacturing in both scientific equipment and consumer goods. Hardware released under free licenses is known as Free and Open Source Hardware (FOSH). The availability of these FOSH designs has a large value to...

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  • White Papers // Dec 2014

    The Mechanism of "Big Data" Impact on Consumer Behavior

    The growth of the network data is beyond the processing capacity of the existing IT infrastructure. At the same time, "Big data" is also a major influence on consumer's behavior. C2C (Consumer-To-Consumer) e-commerce consumption pattern is experiencing a vigorous development time of the electronic commerce in China. Because of its...

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  • White Papers // Dec 2014

    Game Theory Analysis of E-Commerce's Price War

    Home appliance industry is one of the most competitive industries in China, but the price war also prolonged. The reasons for e-commerce price war of home appliance industry are various; this paper attempts to use the game theory and information economics analysis method to discuss the form of competition pattern,...

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  • White Papers // Dec 2014

    Ontologies for Software Project Management: A Review

    "Software project management is a knowledge intensive process that can benefit substantially from ontology development and ontology engineering. Ontology development could facilitate or improve substantially the software development process through the improvement of knowledge management, the increase of software and artefacts reusability, and the establishment of internal consistency within project...

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  • White Papers // Dec 2014

    Research on Location-Inventory Model in Grain Emergency Network

    "Once the disaster occurred, a huge amount of grain supply is needed from disaster area. Because of the short shelf life, grain is very strict with reserve environment and needed to rotate on a regular basis in the process of reserves. Considering the limitations of existing related research, this paper...

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  • White Papers // Dec 2014

    Proxy Server Experiment and Network Security with Changing Nature of the Web

    The total reliance on internet connectivity and World Wide Web (WWW) based services is forcing many organizations to look for alternative solutions for providing adequate access and response time to the demand of their ever increasing users. A typical solution is to increase the bandwidth; this can be achieved with...

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  • White Papers // Dec 2014

    A Study on Credit Appraisal System of C2C E-Commerce

    In the virtual network environment, the C2C (Consumer-To-Consumer) e-commerce has some problems in product quality, service, credit speculation. At present the credit appraisal system offered by domestic C2C ecommerce website ensures the network security to a certain extent while it has some problems in identity verification, evaluation rules and model,...

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  • White Papers // Nov 2014

    Smart Phone Application Evaluation with Usability Testing Approach

    "In this paper, the authors present a narrative role methodology based on different people's opinions, which is now implemented in their research environment for the purpose of testing novel techniques, the usability testing of most common used smart phones such as Android and Apple Smartphone application. This paper analysis is...

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  • White Papers // Nov 2014

    An Integrated Intrusion Detection System by Combining SVM with AdaBoost

    "In the Internet, computers and network equipments are threatened by malicious intrusion, which seriously affects the security of the network. Intrusion behavior has the characteristics of fast upgrade, strong concealment and randomness, so that traditional methods of Intrusion Detection System (IDS) are difficult to prevent the attacks effectively. In this...

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  • White Papers // Nov 2014

    Categorization of Software Release Risks and Its Abatement Strategy

    "Growing competition in the software industry with the persistently changing needs and the usual problems associated with software release, which have made acceptance of new software in market, are extremely important for the success. Volatility in the software developmental processes is generally difficult to handle. The change request at any...

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  • White Papers // Nov 2014

    Technical Possibilities of Cloud-Based Virtual Reality Implementing Software as a Service for Online Collaboration in Urban Planning

    In this paper, the authors discuss the technical possibilities of cloud-based Virtual Reality (cloud-based VR) computing tools for online collaboration in urban planning and design. A platform for cloud-based VR technology, i.e., a VR-cloud server, is used to open the VR dataset to public collaboration over the Internet. The digital...

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  • White Papers // Nov 2014

    An Empirical Study of the Optimum Team Size Requirement in a Collaborative Computer Programming/Learning Environment

    "Pair programming has been widely acclaimed the best way to go in computer programming. Recently, collaboration involving more subjects has been shown to produce better results in programming environments. However, the optimum group size needed for the collaboration has not been adequately addressed. This paper seeks to inculcate and acquaint...

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  • White Papers // Nov 2014

    Detecting Design Patterns in Object-Oriented Program Source Code by Using Metrics and Machine Learning

    "Detecting well-known design patterns in object-oriented program source code can help maintainers understand the design of a program. Through the detection, the understandability, maintainability, and reusability of object-oriented programs can be improved. There are automated detection techniques; however, many existing techniques are based on static analysis and use strict conditions...

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  • White Papers // Nov 2014

    An Integrated Multi-Echelon Model for a Sustainable Closed Loop Supply Chain Network Design

    "The integration of entire supply and value chain into a closed loop network is gaining more importance in recent times in order to ensure a business to be economically and environmentally sustainable with the changing trends in business and social environments, growing environmental consciousness in the society and government legislations...

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  • White Papers // Nov 2009

    A Comparative Study of Medium Access Control Protocols for Wireless Sensor Networks

    One of the major constraints in Wireless Sensor Networks (WSNs) is power consumption. In recent years, a lot of efforts have been put into the design of Medium Access Control (MAC) protocols for WSN, in order to reduce energy consumption and enhance the network's lifetime. This paper surveyed some MAC...

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  • White Papers // Aug 2010

    A Survey on Context-Aware Sensing for Body Sensor Networks

    Context awareness in Body Sensor Networks (BSNs) has the significance of associating physiological user activity and the environment to the sensed signals of the user. The context information derived from a BSN can be used in pervasive healthcare monitoring for relating importance to events and specifically for accurate episode detection....

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  • White Papers // Mar 2012

    An Integrative Comparison of Energy Efficient Routing Protocols in Wireless Sensor Network

    Many advances have been made in sensor technologies which are as varied as the applications; and many more are in progress. It has been reasonable to design and develop small size sensor nodes of low cost and low power. In this paper, the authors have explored some energy-efficient routing protocols...

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  • White Papers // Mar 2011

    A Comment on Link Dynamics and Protocol Design in a Multi-Hop Mobile Environment

    This paper is a supplementary document for "Link Dynamics and Protocol Design in a Multi-Hop Mobile Environment", which presents an analytic model to obtain link lifetime in mobile wireless networks. The model outcome is used as groundwork for several mobility-related evaluations. Here, it is discussed how an improper assumption in...

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  • White Papers // Apr 2011

    A Practical Solution for Location Estimation in Manually Deployed Wireless Sensor Networks

    This paper addresses the existing research and adds another aspect of functionality by incorporating pertinent sensor nodes to provide a dynamic location discovery and estimation. The software used provides an easy graphical user interface to visualize a particular location in accordance with geographical latitude and longitude. A simple real time...

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  • White Papers // Apr 2011

    Classification of Object Tracking Techniques in Wireless Sensor Networks

    Object tracking is one of the killer applications for Wireless Sensor Networks (WSN) in which the network of wireless sensors is assigned the task of tracking a particular object. The network employs the object tracking techniques to continuously report the position of the object in terms of Cartesian coordinates to...

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  • White Papers // Apr 2011

    A Direct Trust Dependent Link State Routing Protocol Using Route Trusts for WSNs (DTLSRP)

    The traditional cryptographic security techniques are not sufficient for secure routing of message from source to destination in Wireless Sensor Networks (WSNs), because it requires sophisticated software, hardware, large memory, high processing speed and communication bandwidth. It is not economic and feasible because, depending on the application, WSN nodes are...

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  • White Papers // Apr 2011

    Ambient Intelligence: Awareness Context Application in Industrial Storage

    WSNs are designed to efficiently collect data and monitor environments, among other applications. This paper describes the concept and realization of an Active Security System for security management of warehousing of chemical substances using WSNs. The authors present an approach to modeling and simulating cooperation between intelligent products that are...

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  • White Papers // May 2011

    In-Motes EYE: A Real Time Application for Automobiles in Wireless Sensor Networks

    Wireless sensor networks have been identified as one of the key technologies for the 21st century. In order to overcome their limitations such as fault tolerance and conservation of energy, the authors propose a middleware solution, In-Motes. In-Motes stands as a fault tolerant platform for deploying and monitoring applications in...

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  • White Papers // May 2011

    Implementation Study of a Centralized Routing Protocol for Data Acquisition in Wireless Sensor Networks

    Wireless Sensor Networks (WSNs) attract considerable amount of research efforts from both industry and academia. With limited power and computational capability available on a sensor node, robustness and efficiency are major concerns when designing a routing protocol for WSNs with low complexity. There are various existing design approaches, such as...

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  • White Papers // Mar 2011

    A Fault-Tolerant Cooperative Spectrum Sensing Algorithm Over Cognitive Radio Network Based on Wireless Sensor Network

    A serious threat to cognitive radio networks that sense the spectrum in a cooperative manner is the transmission of false spectrum sensing data by malicious sensor nodes. SNR fluctuations due to wireless channel effects complicate handling such attackers even further. This enforces the system to acquire authentication. Actually, the decision...

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  • White Papers // Mar 2011

    Performance Evaluation of Routing Protocols on the Reference Region Group Mobility Model for MANET

    Group mobility is prevalent in many Mobile Ad hoc NETwork (MANET) applications, such as disaster recovery, military operations, searching and rescue activities. Group partition, as an inherent phenomenon in group mobility, may occur when mobile nodes move in diverse mobility patterns and it causes the network to be partitioned into...

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  • White Papers // Mar 2011

    Energy-Efficient and Reliable Transport Protocols for Wireless Sensor Networks: State-of-Art

    New wireless sensor network applications (e.g., military surveillance) require higher reliability than a simple best effort service could provide. Classical reliable transport protocols like Transmission Control Protocol (TCP) are not well suited for wireless sensor networks due to both the characteristics of the network nodes (low computing power, strong energy...

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  • White Papers // Sep 2009

    Bandwidth Optimization in 802.15.4 Networks Through Evolutionary Slot Assignment

    Traditional Wireless Sensor Networks (WSNs) based on carrier sense methods for channel access suffer from reduced bandwidth utilization, increase energy consumptions and latency problems in networks with high traffic. In this paper, a novel Evolutionary Slot Assignment (ESA) algorithm has been developed to increase the throughput of large wireless mesh...

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  • White Papers // Sep 2009

    Positioning a Node of Wireless Sensor Networks in 3 Dimensional Space

    To know the location of nodes is very important and valuable for Wireless Sensor Networks (WSN), the authors present an improved positioning model (3D-PMWSN) to locate the nodes in WSN. In this model, grid in space is presented. When one tag is detected by a certain reader whose position is...

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  • White Papers // Oct 2009

    An Adaptive Data Aggregation Algorithm in Wireless Sensor Network With Bursty Source

    The Wireless Sensor network is distributed event based systems that differ from conventional communication network. Sensor network has severe energy constraints, redundant low data rate, and many-to-one flows. Aggregation is a technique to avoid redundant information to save energy and other resources. There are two types of aggregations. In one...

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  • White Papers // Nov 2009

    Evaluation of Network Stack Optimization Techniques for Wireless Sensor Networks

    The authors present a network stack implementation for a wireless sensor platform based on a byte-level radio. The network stack provides error-correction code, multi-channel capability and reliable communication for a high packet reception rate as well as a basic packet-level communication interface. In outdoor tests, the packet reception rate is...

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  • White Papers // Nov 2009

    Modified Ceiling Bounce Model for Computing Path Loss and Delay Spread in Indoor Optical Wireless Systems

    This paper proposes modifications to the tradional Ceiling Bounce Model and uses it to characterize diffuse indoor optical wireless channel by analyzing the effect of transceiver position on signal propagation properties. The modified approach uses a combination of the tradional ceiling bounce method and a statistical approach. The effects of...

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  • White Papers // Nov 2009

    Real-Time Automatic ECG Diagnosis Method Dedicated to Pervasive Cardiac Care

    Recent developments of the wireless sensor network will revolutionize the way of remote monitoring in different domains such as smart home and smart care, particularly remote cardiac care. Thus, it is challenging to propose an energy efficient technique for Automatic ECG Diagnosis (AED) to be embedded into the wireless sensor....

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  • White Papers // Nov 2009

    AEESPAN: Automata Based Energy Efficient Spanning Tree for Data Aggregation in Wireless Sensor Networks

    In Wireless Sensor Networks (WSNs), sensor nodes are developed densely. They have limit processing capability and low power resources. Thus, energy is one of most important constraints in these networks. In some applications of sensor networks, sensor nodes sense data from the environment periodically and transmit these data to sink...

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  • White Papers // Nov 2009

    Distributed Video Coding Using LDPC Codes for Wireless Video

    Popular video coding standards like H.264 and MPEG working on the principle of motion-compensated predictive coding demand much of the computational resources at the encoder increasing its complexity. Such bulky encoders are not suitable for applications like wireless low power surveillance, multimedia sensor networks, wireless PC cameras, mobile camera phones...

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  • White Papers // Nov 2009

    Dynamic Hierarchical Communication Paradigm for Wireless Sensor Networks: A Centralized, Energy Efficient Approach

    A Wireless Sensor Network (WSN) consists of a large number of randomly deployed sensor nodes. These sensor nodes organize themselves into a cooperative network and perform the three basic functions of sensing, computations and communications. Research in WSNs has become an extensive explorative area during the last few years, especially...

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  • White Papers // Nov 2009

    Minimization of Collision in Energy Constrained Wireless Sensor Network

    Wireless Sensor Networks (WSNs) are one of the fastest growing and emerging technologies in the field of Wireless Networking today. The applications of WSNs are extensively spread over areas like Military, Environment, Health Care, Communication and many more. These networks are powered by batteries and hence energy optimization is a...

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  • White Papers // Nov 2009

    An Energy-Efficient MAC Protocol for WSNs: Game-Theoretic Constraint Optimization With Multiple Objectives

    In WSNs, energy conservation is the primary goal, while throughput and delay are less important. This results in a tradeoff between performance (e.g., throughput, delay, jitter, and packet-loss-rate) and energy consumption. In this paper, the problem of energy-efficient MAC protocols in WSNs is modeled as a game-theoretic constraint optimization with...

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  • White Papers // Jul 2011

    An Exploratory Study of Experimental Tools for Wireless Sensor Networks

    The objective of this contribution is to present expositive review content on currently available experimental tools/services/concepts used for most emerging field Wireless Sensor Network that has capability to change many of the Information Communication aspects in the upcoming era. Currently due to high cost of large number of sensor nodes...

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  • White Papers // Nov 2009

    A Novel Topology for the Zonal Network With Wireless Coverage

    In this paper, the authors propose a banyan-tree topology for the wireless coverage along the road or railway, which is characterized as a zonal network. Theoretical analysis and numerical studies show that the proposed banyan-tree topology is appropriate for the zonal network with the Wireless Mesh Network (WMN) technology, which...

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  • White Papers // Nov 2009

    A Multipath Routing Algorithm Based on Traffic Prediction in Wireless Mesh Networks

    The technology of QoS routing has become a great challenge in Wireless Mesh Networks (WMNs). There exist a lot of literatures on QoS routing in WMNs, but the current algorithms have some deficiencies, such as high complexity, poor scalability and flexibility. To solve the problems above, a Multipath Routing Algorithm...

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  • White Papers // Nov 2009

    Mobile Positioning System Based on the Wireless Sensor Network in Buildings

    Established on the Intel Multi-Core Embedded platform, using 802.11 Wireless Network protocols as the communication medium, combining with Radio Frequency-Communication and Ultrasonic Ranging, implement a mobile terminal system in an intellectualized building. It can provide its holder such functions: accurate positioning, intelligent navigation, video monitoring, and wireless communication. The innovative...

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  • White Papers // Dec 2009

    Target Tracking With QoS Support in Large Wireless Sensor Networks

    Quality of Service (QoS) is important in the application of target tracking in Wireless Sensor Networks (WSNs). When a target appears, it will trigger an event from one or more sensors. A target can only be accurately detected if a certain number of event packets are received by the sink...

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  • White Papers // Dec 2009

    A Mobile-Agent-Based Adaptive Data Fusion Algorithm for Multiple Signal Ensembles in Wireless Sensor Networks

    Distributed Compressed Sensing (DCS) is an emerging field that exploits both intra- and inter-signal correlation structures and enables new distributed coding algorithms for multiple signal ensembles in wireless sensor networks. The DCS theory rests on the joint sparsity of a multi-signal ensemble. In this paper, the authors propose a new...

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  • White Papers // Dec 2009

    EasiSim: A Scalable Simulator for Wireless Sensor Networks

    Traditional simulators have deficiencies of scalability, thus they are not so efficient in running simulations with large-scale networks. In this paper, the authors present a new simulator, namely EasiSim, specifically for evaluating sensor networks on a large scale. EasiSim is featured by organizing its core components, including nodes, topology and...

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  • White Papers // Dec 2009

    Dynamic Load Balancing With Overlay-Based Reconfiguration for Wireless Sensor Networks

    Wireless sensor networks are characterized by multihop wireless links and resource constrained nodes. In terms of data collection and forwarding scheduling, this paper investigates the load balancing in sensor nodes and wireless link based on the performance of wireless sensor networks. Leveraging the property of dissimilarity distribution, a method to...

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  • White Papers // Jun 2009

    Fractional Sampling Improves Performance of UMTS Code Acquisition

    An improved technique with a fractional sampling based on two samples per chip, according to the Nyquist criterion, has been employed by the authors to enhance the performance in the code synchronization of UMTS (or W-CDMA) systems. In this paper, the authors investigate on the theoretical rationale of such a...

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  • White Papers // Jun 2009

    On Approaches to Congestion Control Over Wireless Networks

    Congestion control in wireless networks has been extensively investigated over the years and several schemes and techniques have been developed, all with the aim of improving performance in wireless network. With the rapid expansion and implementation of wireless technology it is essential that the congestion control problem be solved. This...

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  • White Papers // Jun 2009

    An Improved Analytical Model for IEEE 802.11 Distributed Coordination Function Under Finite Load

    In this paper, an improved analytical model for IEEE 802.11 Distributed Coordination Function (DCF) under finite load is proposed by closely following the specifications given in IEEE 802.11 standard. The model is investigated in terms of channel throughput under perfect and slow Rayleigh fading channels. It is shown that the...

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  • White Papers // Jul 2009

    The Application of Optical CDMA-Based Fiber Radio Networks in Wireless Sensor Networks

    One fiber radio scheme using shifted prime codes for interference elimination is proposed for Optical Code-Division Multiple-Access (OCDMA) network. By taking advantage of the cyclic property of the shifted prime codes in the same code groups, the proposed compact decoder is low cost and suitable to be used in the...

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  • White Papers // Jul 2009

    Centralized Quasi-Static Channel Assignment for Multi-Radio Multi-Channel Wireless Mesh Networks

    Employing multiple channels in wireless multi-hop networks is regarded as an effective approach to increasing network capacity. This paper presents a centralized quasi-static channel assignment for multi-radio multi-channel Wireless Mesh Networks (WMNs). The proposed channel assignment can efficiently utilize multiple channels with only 2 radios equipped on each mesh router....

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  • White Papers // Aug 2009

    UWB-Based Localization in Wireless Sensor Networks

    Localization has many important applications in wireless sensor networks, such as object searching and tracking, remote navigation, location based routing etc. The distance measurements have been based on a variety of technologies, such as acoustic, infrared, and UWB (Ultra-Wide Band) media for localization purposes. In this paper, the authors propose...

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  • White Papers // Jul 2009

    Incremental Network Programming for Wireless Sensors

    The authors present an incremental network programming mechanism which reprograms wireless sensors quickly by transmitting the incremental changes using the Rsync algorithm; they generate the difference of the two program images allowing one to distribute only the key changes. Unlike previous approaches, their design does not assume any prior knowledge...

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  • White Papers // Jul 2009

    Performance of Block Space-Time Code in Wireless Channel Dynamics

    In this paper, the authors observe the behavior of block space-time code in wireless channel dynamics. The block space-time code is optimally constructed in slow fading. The block code in quasi-static fading channels pro-vides affordable complexity in design and construction. Their results show that the performance of the block space-time...

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