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Taschenbuch. Zustand: 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.

Taschenbuch. Zustand: Neu. Neuware -High Speed Packet Access is an amalgamation of High Speed Downlink Packet Access (HSDPA) & High Speed Uplink Packet Access (HSUPA), that extends & improves the performance of mobile telecommunication networks utilizing the WCDMA protocols. HSDPA allows for higher data rates due to new adaptive Modulation and Coding techniques, Hybrid Automatic Repeat reQuest & fast scheduling algorithm. One of the key features of HSDPA is to handle UMTS traffic classes with different QoS requirements. In order to provide QoS several scheduling algorithms, QoS control constraints, & different other schemes have been proposed in literature. In this book, a sophisticated model for HSDPA is presented to simulate various algorithms. The QoS controls in terms of guaranteed bit rate have been implemented by means of barrier functions which perform barrier around the feasible region. The results illustrate the trade-off between the cell throughput & the minimum guaranteed bit rate. Traffic classes are prioritized by means of QoS parameters. The priority is given to RT traffic streams over interactive services. Real-Time algorithms have been simulated to prioritize traffic classes based on delays.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 108 pp. Englisch.

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Taschenbuch. Zustand: Neu. Kommunikations-management | Multi-organisatorische Perspektiven | Syed Zahidur Rashid | Taschenbuch | 312 S. | Deutsch | 2025 | Verlag Unser Wissen | EAN 9786208494797 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu.

Taschenbuch. Zustand: 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. Zustand: 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.

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Taschenbuch. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: Neu. Neuware -The purpose of this book is to provide a tutorial overview on the subject of computerized tomographic imaging. The book is expected to be useful for practicing engineers & scientists for gaining an understanding of what can & cannot be done with tomographic imaging. Toward this end, the author has tried to strike a balance among purely algorithmic issues, topics dealing with how to generate data for reconstruction in different domains, & artifacts inherent to different data collection strategies. Our hope is that the style of presentation used will also make the book useful for a beginning graduate course on the subject. The book is mostly self-contained for graduate students in engineering, the sciences, & mathematics. But if the instructor wishes to impart proficiency in the implementations, it would be desirable for the students to have had some prior experience with writing computer programs for digital signal or image processing. The introductory material included in this book should help the reader review the relevant practical details in digital signal & image processing. In general, this book is intended for physicians, radiographers, engineers, technicians and physicists.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 404 pp. Englisch.

Taschenbuch. Zustand: 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.

Zustand: New.

Zustand: New.