199,661 research outputs found
Integrating Self Testability with Design Space Exploration by a Controller based Estimation Technique
No full textRecent research for testable designs has focussed on inserting test structures by re-arranging an Register-Transfer- Level (RTL) data path generated from a behavioural description to make more testable. Although it can be argued that good results have been obtained with such approaches, we must keep in mind that with the emergence of commercial behavioural synthesis tools it is difficult for the designer to understand an automatically generated structural RTL description. With the ever increasing complexity and pressure to shorten time to market, test synthesis must not be dissociated from design synthesis. This paper shows that it is possible to generate optimised self-testable RTL when addressed at the highest level of abstraction ie., behavioural description. This is achieved by developing a novel and accurate Built-In Self-Test (BIST) resource estimation technique based on exploitation of certain characteristics of the controller of the design
Analysis of Advanced Diversity Receivers for Fading Channels
No full textProliferation of new wireless technologies has rekindled the interest on the design, analysis and implementation of suboptimal receiver structures that provide good error probability performance with reduced power consumption and complexity particularly when the order of diversity is large. This thesis presents a unified analytical framework to perform a trade-off study for a class of hybrid generalized selection combining technique for ultra-wideband, spread-spectrum and millimeter-wave communication receiver designs.
The thesis also develops an exact mathematical framework to analyze the performance of a dual-diversity equal gain combining (EGC) receiver in correlated Nakagami-m channels, which had defied a simple solution in the past. The framework facilitates efficient evaluation of the mean and variance of coherent EGC output signal-to-noise ratio, outage probability and average symbol error probability for a broad range of digital modulation schemes. A comprehensive study of various dual-diversity techniques with non-independent and non-identical fading statistics is also presented.
Finally, the thesis develops some closed-form solutions for a few integrals involving the generalized Marcum Q-function. Integrals of these types often arise in the analysis of multichannel diversity reception of differentially coherent and noncoherent digital communications over Nakagami-m channels. Several other applications are also discussed.Master of Scienc
Gaur: Wild Cattle in Peril
No full text33-35The shy gaur is under grave threat.The largest gregarious wild cattle found in Asia, with the largest population left in India, demands
long-term conservation strategy
Chromosomes of gaur cross domestic cattle hybrids
No full textThe chromosomes of five gaur (Bos gaurus hubbacki) domestic cattle (B indicus cross B taurus) hybrids (three females, two males) were studied using the leucocyte culture method and centromeric (C) banding technique. All the hybrids had a diploid chromosome number of 2n = 58, made up of two submetacentric autosomes (different in size) and 54 acrocentric autosomes, most of which could be arranged in pairs in descending order of size. The sex (X) chromosomes in females were a pair of submetacentric chromosomes smaller than the submetacentric autosomes. The Y chromosome in males was a small submetacentric chromosome. The C banding patterns were useful in identifying the X and Y chromosomes and the inherited submetacentric autosomes from the gaur sire. Phenotypically, the hybrids resembled normal B indicus cross B taurus calves except for the presence of a distinct hump-like dorsal ridge containing the spinous processes of the third to 11th thoracic vertebrae, upright 'deer-like' ears and long lean legs. The potential of these hybrids as important genetic resources for meat production is stressed
Chromosome evolution of the Malayan gaur (Bos gaurus hubbacki)
No full textA GTG-banding comparison between the chromosomes of gaur (Bos gaurus hubbacki, BGA, 2n = 56) and those of domestic cattle (Bos taurus, BTA, 2n = 60) was performed to establish chromosome homoeologies or differences between the two species. The two biarmed chromosomes of gaur (BGA1 and BGA2) were originated by centric fusion translocations between homoeologous cattle chromosomes 1/29 (BGA1) and 2/28 (BGA2). High resolution GTG-banding comparison between BGA1 and BTA1/BTA29 revealed that BGA1q differentiated from BTA1 by a paracentric inversion of a large and proximal chromosome region (BTA1q13-q32). To our knowledge, this is the first case of a bovid biarmed chromosome originated by centric fusion and paracentric inversion during karyotype evolution. The CBG-banding pattern showed clear C-bands in all autosomes, although the two biarmed pairs showed smaller C-bands, especially in BGA2. The results were discussed on the basis of previous results obtained in other bovid species, including the carriers of rob(1; 29) of cattle, the most known and widely spread chromosome abnormality in Bos taurus
SPARK: Secure Pseudorandom Key-based Encryption for Deduplicated Storage
No full textDeduplication is a widely used technology to reduce the storage and communication cost for cloud storage services. For any cloud infrastructure, data confidentiality is one of the primary concerns. Data confidentiality can be achieved via user-side encryption. However, conventional encryption mechanism is at odds with deduplication. Developing a user-side encryption mechanism with deduplication is a vital research topic. Existing state-of-the-art solutions in security of deduplication are vulnerable to dictionary attacks and tag inconsistency anomaly. In this paper, we present SPARK, a novel approach for secure pseudorandom key-based encryption for deduplicated storage. SPARK achieves semantic security along with deduplication. Security analysis proves that SPARK is secure against dictionary attacks and tag inconsistency anomaly. As a proof of concept, we implement SPARK in realistic environment and demonstrate its efficiency and effectiveness
Cryptanalysis of RC4(n, m) stream cipher
No full textRC4(n, m) is a stream cipher based on RC4 and is designed by G. Gong et al. It can be seen as a generalization of the famous RC4 stream cipher designed by Ron Rivest. The authors of RC4(n, m) claim that the cipher resists all the attacks that are successful against the original RC4.\ud
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The paper reveals cryptographic weaknesses of the RC4(n, m) stream cipher. We develop two attacks. The first one is based on non-randomness of internal state and allows to distinguish it from a truly random cipher by an algorithm that has access to 24·n bits of the keystream. The second attack exploits low diffusion of bits in the KSA and PRGA algorithms and recovers all bytes of the secret key. This attack works only if the initial value of the cipher can be manipulated. Apart from the secret key, the cipher uses two other inputs, namely, initial value and initial vector. Although these inputs are fixed in the cipher specification, some applications may allow the inputs to be under the attacker control. Assuming that the attacker can control the initial value, we show a distinguisher for the cipher and a secret key recovery attack that for the L-bit secret key, is able to recover it with about (L/n) · 2n steps. The attack has been implemented on a standard PC and can reconstruct the secret key of RC(8, 32) in less than a second
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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