information retrieval (IR) systems offer a variety of interfaces and interaction modes. A given IR system's interface and interaction mode may not be optimal for a given accessing device/network pair or desired by...
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ISBN:
(纸本)0769523153
information retrieval (IR) systems offer a variety of interfaces and interaction modes. A given IR system's interface and interaction mode may not be optimal for a given accessing device/network pair or desired by a given user. In this paper we propose a set of attributes to characterize IR interfaces, interaction and presentation modes. We call a set of these bound attributes an information Navigation Profile (INP). We suggest the use of INPs in dynamic adaptation of IR interface, interaction and presentation modes by both origin and proxy servers.
We propose an electronic voting (e-voting) scheme that combines user-centric mix networks with voter-verifiable receipts. Unlike traditional mixilet-based e-voting schemes, our scheme empowers voters;the voters themse...
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ISBN:
(纸本)0769523153
We propose an electronic voting (e-voting) scheme that combines user-centric mix networks with voter-verifiable receipts. Unlike traditional mixilet-based e-voting schemes, our scheme empowers voters;the voters themselves decide the degree of anonymity required. Voters requiring a greater degree of anonymity obtain it by performing several protocol iterations. The proposed scheme utilizes incoercible, voter-verifiable receipts. It is robust as no reasonable-sized coalition can interfere with the correct operation. Finally, it is efficient as the number of transmitted messages increases linearly with the number of voters.
In spatial resolution reduction transcoding, the original resolution of the incoming frames is reduced to a lower resolution in the out going frames. In the reduced resolution the motion vector of every macroblock nee...
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ISBN:
(纸本)0769521088
In spatial resolution reduction transcoding, the original resolution of the incoming frames is reduced to a lower resolution in the out going frames. In the reduced resolution the motion vector of every macroblock needs to be calculated from the corresponding four macroblock of the original frame. Instead of re-estimating these motion vectors, a number of techniques recompose these vectors using the incoming information to reduce computational complexity. Many techniques utilize the quantized DCT coefficients of residual blocks for composing the invalid vectors. This paper proposes a new motion vector composition technique by normalizing the low frequency DCT coefficients with the visual quantization matrix (VQM) derived from the study of human visual system (HVS). Simulation results show that the performance of this modified technique is better compared to other similar techniques.
In many applications a software implementation of ECC (Elliptic Curve Cryptography) might be inappropriate due to performance requirements, therefore hardware implementations are needed. We present some results about ...
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ISBN:
(纸本)0769523153
In many applications a software implementation of ECC (Elliptic Curve Cryptography) might be inappropriate due to performance requirements, therefore hardware implementations are needed. We present some results about a novel hardware implementation for ECC, that introduces also a form of parallelism to maximize the use of function units and hence to improve the throughput. Then we propose a comprehensive comparison of this new architecture with both some RSA architectures and other ECC implementations in ASIC VLSI technology.
The amount of structured information available in Internet sources is rapidly increasing. This information includes commercial databases on product information and information on e-services forming the so-called e-sho...
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ISBN:
(纸本)0769510620
The amount of structured information available in Internet sources is rapidly increasing. This information includes commercial databases on product information and information on e-services forming the so-called e-shops. However. the process of using this information has become more complicated, and can sometimes be tedious for users with different goals, interests, levels of expertise, abilities and preferences. This paper deals with the definition of an architectural framework for intelligent, adaptive and personalised navigation within large hypertext Electronic Commerce environments.
Novel synchronous coding schemes are introduced and relationships between optimal synchronous codes and Huffman codes are also discussed. Although the problem of existence of optimal synchronous codes has not been res...
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ISBN:
(纸本)0769515061;076951507X
Novel synchronous coding schemes are introduced and relationships between optimal synchronous codes and Huffman codes are also discussed. Although the problem of existence of optimal synchronous codes has not been resolved yet, we show that any synchronous code can consider as an optimal synchronous code for some information source and that there always exist optimal synchronous codes for the information source with a dyadic probability, distribution. Comparing with Huffman coding, the synchronous coding is used not only for statistical modeling but also for dictionary methods. Moreover, it is proven that breaking a synchronous code is NP-complete.
Resource Brokers on the Grid consult a number of distributed information services to select the best data source and/or computational resource based on user requirements. The consultation task increases the design com...
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ISBN:
(纸本)0769523153
Resource Brokers on the Grid consult a number of distributed information services to select the best data source and/or computational resource based on user requirements. The consultation task increases the design complexity of Resource Brokers. This work is the first attempt to unify the distributed grid information services in one framework. The Grid Query Service (GQS) is composed of information services layered on OGSA-DAI Grid services, which are generic data access and integration services. Grid Resource Brokers can consult just one service, the GQS service, to obtain indexed information about grid resources.
Personalization recommendation is a valid method for lightening the user's burden on information retrieval. In order to implement personalization recommendation for text information retrieval (TR), User-focus is d...
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ISBN:
(纸本)0769521088
Personalization recommendation is a valid method for lightening the user's burden on information retrieval. In order to implement personalization recommendation for text information retrieval (TR), User-focus is defined and algorithms for the construction of user-focus are given in this paper. The construction of user-focus for a user depends on his entire query requests at a period of time. Each query request of the user is treated as a transaction between TR system and him. Items in a transaction are non-noise words in the query request corresponding with the transaction. Each item is weighted with a value to measure the importance of the item for the user. Weighted frequent itemset is used for the user-focus's construction. In order to mine weighted frequented itemset fast, an algorithm named as WeightedFP is presented The experimental result shows that the implementation of personalization recommendation based on user-focus can lighten the user's burden caused by the work of filtering valid information from vast information in some degree while time requirement of TR is satisfied well.
A new Huffman coding and decoding technique is presented. There is no need to construct a full size Huffman table in this technique;instead, the symbols are encoded directly from the table of code-lengths. For decodin...
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ISBN:
(纸本)0769519164
A new Huffman coding and decoding technique is presented. There is no need to construct a full size Huffman table in this technique;instead, the symbols are encoded directly from the table of code-lengths. For decoding purposes a new Condensed Huffman Table (CHT) is also introduced. It is shown that by employing this technique both encoding and decoding operations become significantly faster, and the memory consumption also becomes much smaller compare to the normal Huffman coding/decoding.
We report on the performance of an optimized parallel channel coder for high-speed optical transmission systems. The coding properties are discussed by an evaluation of the signal statistics of the coded pulse train i...
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ISBN:
(纸本)0769510620
We report on the performance of an optimized parallel channel coder for high-speed optical transmission systems. The coding properties are discussed by an evaluation of the signal statistics of the coded pulse train in the time and frequency domain. The discussion is mainly based on the results far the power spectral density (PSD) and the autocorrelation function (AKF). The theoretical investigations have been verified by measurements with a developed 2.488 Gbit/s optical transmission system. Reliability studies have shown a system's bit error rate below 10(-13).
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