syed zahidur rashid (129 risultati)

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Condizione: Sehr gut. Zustand: Sehr gut | Seiten: 392 | Sprache: Englisch | Produktart: Bücher.

Taschenbuch. Condizione: Neu. Neuware -Emerging multimedia applications are generating a demand for public networks to be able to multiplex and switch simultaneously a wide spectrum of data rates. Traffic control and resource management are complex issues in wireless asynchronous transfer mode (WATM) due to broad range quality-of-services (QoS) and limited bandwidth spectrum. In WATM, traffic control is essential in order to protect the network from congestion and to achieve realistic network efficiency in compliance with the QoS. Exchanging access point to the backbone network is thereby common and this may contribute to connection rejections when channels are busy. The effect to QoS at call level is the high probability of handover dropping if the targeted call site has no available channels. The main objective of this book is the performance analysis of handover schemes in WATM with virtual connection tree (VCT) that can give high QoS performance in terms of probability of new call block and handover call dropping. Hence, an improvement had been made and it is called With Queuing and Reserved Channels (WQRC). Using WQRC, low probability of handover dropping is maintained and new call blocking probability is reduced.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

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Taschenbuch. Condizione: Neu. Neuware -Broadband wireless access systems such as Local Multipoint Communications Services (LMCS) is aiming to provide multimedia communication services to subscribers in fixed locations. Some of the key issues in LMCS systems are the coverage and the cochannel interference. These problems have to be resolved before a successful deployment of such services. In this book, we implement two techniques that are known to combat co-channel interference; these techniques are power control and macrodiversity. The objective of this research is to analyze the system performance of LMCS system using these techniques and under different scenarios. Appropriate power control command rate and power control step size are provided. Furthermore, the effect of macrodiversity on system availability is investigated. A computer simulation was developed and used to determine the system performance of the LMCS network model. The results of the simulation are obtained and presented for different propagation environment and system parameters. The investigated parameters include the propagation exponent, lognormal deviation, Rician K factor, correlation factor of fading channel, power control rate and step size.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 132 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -Computational linguistics (CL) is a discipline between linguistics & computer science, concerned with the computational aspects of the human language faculty. It belongs to the cognitive sciences, linguistics & overlaps with the field of artificial intelligence, a branch of computer science aiming at computational models of human cognition. Natural language processing also overlapping these fields, concerned with the interactions between computers & human languages providing the possibility of natural language interfaces to knowledge bases and natural language translation. CL develop formal models simulating aspects of the human language faculty & implement them as computer programs, which constitute the basis for the evaluation & further development of the theories. In addition to linguistic theories, findings from cognitive psychology play a major role in simulating linguistic competence. Within psychology, it is mainly the area of psycholinguistics that examines the cognitive processes constituting human language use. The relevance of computational modelling for psycholinguistic research is reflected in the emergence of a new sub discipline: computational psycholinguistics.Books on Demand GmbH, Überseering 33, 22297 Hamburg 400 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -Software engineering is the study and an application of engineering to the design, development, and maintenance of software. Documentation engineering has become a very important aspect in the software engineering community. The role of documentation in a software engineering environment is to communicate information to its audience and instil knowledge of the system and efficiently allow for future software development. An engineered solution to the documentation problem would involve allocating appropriate resources to document adequate knowledge about the system to the extent that both current and future development will optimally benefit. Unfortunately, neither do we fully understand the impact of documentation on current or future development,nor what aspects of documentation contribute to its ability to communicate effectively. We do not really know to what extent we should document in order to balance the trade-offs between, on the one hand, allocating too many resources for documentation thus hindering present development; and, on the other hand, not allocating enough resources and thus hindering future development. This book focuses on the issue of documentation quality.Books on Demand GmbH, Überseering 33, 22297 Hamburg 396 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book investigates the recent automated greyscale image colorization techniques using a custom developed GNU Image Manipulation Package (GIMP) plug-in. This process involves the transfer of color between a compositionally similar source color image and destination greyscale image. Emerging colorization techniques offer an automated solution to the colorization problem. A GIMP plug-in was implemented, that GIMP plug-in was used to critically evaluate the colorization process. A complete analysis was performed on the images by varying parameters to find the best balance between the neighbourhood size, sampling technique, weighted ratios of pixel luminance, standard deviation and mean. The plug-in developed offers an integrated greyscale image colorization capability to the GIMP suite, and brings the power of automated colorization to the GIMP user community.It was discovered that a trivial scan line uniform sampling technique produced comparable if not slightly better results than more computationally expensive techniques based on pixel neighbourhood statistical analysis. This book shows that it is important for images to correlate in composition and size.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 212 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book investigates the nature of imbalanced data sets and looks at two external methods, which can increase a learner¿s performance on under represented classes. Both techniques artificially balance the training data; one by randomly re-sampling examples of the under represented class and adding them to the training set, the other by randomly removing examples of the over represented class from the training set. A combination scheme is then presented. The approach is one in which multiple classifiers are arranged in a hierarchical structure according to their sampling techniques. The architecture consists of two experts, one that boosts performance by combining classifiers that re-sample training data at different rates, the other by combining classifiers that remove data from the training data at different rates. Using the F-measure, which combines precision and recall as a performance statistic, the combination scheme is shown to be effective at learning from severely imbalanced data sets. In fact, when compared to a state of the art combination technique, Adaptive-Boosting, the proposed system is shown to be superior for learning on imbalanced data sets.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 220 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -Authentication and encryption are very important factors in GSM system security. This book explains the authentication and encryption scheme used in GSM. It explains the A3, A5 and A8 protocols used in the security mechanism in GSM. It explains the different possible attacks on cellular systems, which include SIM cloning, eavesdropping, location tracking, SMS ping, SMS denial of service, authentication denial of service and SMS spam. It classifies these attacks on the basis of target of the attack, type of attack, motivation and severity. It points out the vulnerabilities that are exploited by attacks on cellular systems. The book also looks into how risk analysis, risk modeling and fuzzy logic can be applied to security in mobile systems. It proposes a fuzzy logic based risk model to secure Short Message Service in GSM based cellular networks. The proposed model uses a hybrid approach towards risk modeling and the model continues to evolve with constant feedback from the user. This approach puts the user in control and allows the model to be refined with time to better match the existing circumstances.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 220 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book focuses primarily on the development of orthoface for recognition. Orthoface method transforms faces from image space to face space. It achieves a dimension reduction similar to that of eigenface. All of the classification methods applicable to eigenface method can be applied to the orthoface method without any further modification. It maximises the inter-class scattering, and minimizes the intra-class scattering, which has been the weakness of the conventional eigenface method. The project matrix of the training face from the orthoface method forms an upper-triangular matrix. Each training face has a different number of coefficients allowing better discrimination and classification. The classification technique improves recognition speed significantly. This book also focuses on pose-invariant face recognition. This part concentrates on the use of a 3D head model and texture mapping technique to derive new pose views from one or two existing views, which is realised through the use of a deformable 3D head model. Deformation is done via parameters extracted from various feature measurements. The facial texture is mapped onto the 3D surface using cylinder texture mapping.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 212 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book inspects two different web server solutions. One is Windows solution that consists of Windows Server 2003, IIS and ASP and the other one is a open source solution consisting of FreeBSD, Apache and PHP. The both solutions had the database MySQL as a common component. The survey identifies various factors that play a part when choosing one of the solutions. Open source users prefer performance, security and costs of software while Windows users prefer required knowledge, usability and compatibility.Books on Demand GmbH, Überseering 33, 22297 Hamburg 396 pp. Englisch.

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Taschenbuch. Condizione: Neu. Neuware -The network management function includes monitoring the activities of all network devices and the activities of the user. It also logs the anomalous or malicious activity of the user called intrusions. Normally the administrator would detect network problems or intrusions by analyzing the information in the log file at regular intervals of time. It is proposed to use aural signaling of malicious events. Thus a suitable auralization of all the modules in a network management application would allow a network administrator to take the necessary corrective actions. The goal of this research is to investigate usefulness of auralization in intrusion detection. The work focuses on the auralization of an intrusion detection system and an experimental determination of the effectiveness of the auralization performed. The auralization would allow the administrator to detect some attacks like Denial of service, which would assist in providing better service to the legitimate users by thwarting the intrusions immediately. The work attempts to find the effectiveness of auralization in early detection of false positives as well as in monitoring intruders and vulnerable hosts in a timely manner.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 284 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -Main objectives pursued by parallelism in communications are network capacity enhancement and fault-tolerance. Enhancing efficiently the capacity of a network by parallel communications is a non-trivial task. The parallel paths of arbitrary network topologies can share common resources. Some applications may allow one to split also the sources and the destinations into multiple sources and destinations. An example is parallel I/O. Parallel I/O requires scalability, high throughput and good load balance. In this book we combine fine granularity with scalable high throughput. The network overhead can be reduced and the network throughput can be increased by aggregation of data into large messages. In low latency high performance networks, serious congestions occur due to large indivisible messages competing for shared resources. We propose to optimally schedule the parallel communications taking into account the network topology. The developed scheduling method optimally uses the potential transmission capacity of the network. A challenging idea, inspired by nature, is to simultaneously use all parallel resources. This idea is applied to fine-grained packetized communications.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 260 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book focuses on the fast convergence in Open Shortest Path First (OSPF) based network, which is a crucial factor for real time applications. This book also provides comprehensive coverage of OSPF network design, deployment, and management. One of the most prevalent Interior Gateway Protocols (IGPs), OSPF is in use in numerous networks across the globe. OSPF is also one of the most widely tested protocols. From a technical perspective, the overwhelming presence of OSPF ensures that people will encounter it at some point in his career. As a result, every networking researcher should understand how OSPF operates, how to configure and troubleshoot this important protocol, and most importantly how to design a network that uses OSPF. The book begins with a detailed examination of how OSPF fits into the big picture. It also discusses how OSPF neighboring routers communicate with one another via link-state advertisements (LSAs) and how to optimize this communication for network efficiency. A detailed explanation of how to apply the 'golden rules of design' to create an optimal OSPF network is provided and follows up with a logical approach to configuring OSPF routers and areas.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 324 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -This book is concerned with the image compression methods to advanced video coding algorithms & thus yields an exclusive, self-contained reference for practitioners to build a basis for future study, research, & development. It introduces image compression methods in the case of binary, gray scale, color palette, true color & video images. It works up from basic principles to the advanced video compression systems including MPEG 1, 2, 4 & 7, JPEG, H.261, H.263 & H.264/MPEG-4 AVC. Topics include fractal-based compression, statistical modeling, context modeling, Huffman coding, arithmetic coding, Colomb coding, transform-based modeling, run-length modeling, predictive modeling, progressive image decompression, vector quantization. Existing & forthcoming standards such as JBIG1, JBIG2, JPEG, JPEG-LS & JPEG-2000 are covered. For each algorithm, issues such as quality vs. bit rate vs. MSE and BPP, susceptibility to channel errors & implementation complexities are considered. It contains a lots of reconstructed & error images illustrating the outcome of each compression technique on a consistent image set, thus allowing for a direct assessment of bit rates & reconstructed image quality.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 328 pp. Englisch.

Taschenbuch. Condizione: Neu. Neuware -Face recognition is a complex and difficult problem that is important for surveillance and security, telecommunications, digital libraries, and human-computer intelligent interactions.The book is based on the design and construction of a test-bed for prototyping of embedded face detection and recognition algorithms. It makes use of a hand-held device. This system is different from existing systems because of its embedded information technologies.The embedded device performs both detection and recognition. We present a skin color approach in the YCbCr color space for fast and accurate skin detection. We then process this image using a combination of morphological operators and elliptical shape of faces to segment faces from the other skin colored regions in an image. An eigenface algorithm processes the segmented faces and matches the face to a face database. The methods presented are synergetic efforts from the fields signal and image processing, pattern recognition, machine learning, neural networks, psychophysics, and system engineering. The emphasis is on tested methods such as principal component analysis, dynamic link architecture, support vector machines, and video processing.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 408 pp. Englisch.

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Rashid Syed ZahidurHis research interests are QoS routing in mobile ad-hoc networking, MIMO aware MAC protocols, industrial protocols performance, Chaos in Communications, web based process, network monitoring & control, Telecommunic.

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Rashid Syed ZahidurMy primary interest is cognition and attentional control within the visual system, to how multisensory processing contributes to perception and cognition.Working with blind individuals in particular to reveal the r.

Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Rashid Syed ZahidurHis areas of interest are in the fields of e-marketing and strategic use of social media, interpersonal, organizational, & inter-cultural communication, crisis management, political public relations, terrorism and .