Simplified channel authentication algorithm for secure quantum key distribution

Quantum key distribution (QKD) is characterized by the implementation of the principles of quantum mechanics in distributing the symmetric cryptographic key between two communicating stations. The quantum channel through which a light beam travels and then examined quantum-mechanically is governed by several quantum cryptographic protocols. This paper presents a simplified algorithm of the quantum authentication process (QAP) of the six-state deterministic quantum protocol (6DP). The proposed setup replaces the nonlinear crystal BBO which is responsible for the second harmonic generation process with a simple polarization splitting using Glan Thompson Polarizer (GTP)

EFFECT OF TOOL SHOULDER DIAMETER ON THE MECHANICAL PROPERTIES OF 1200 ALUMINUM FRICTION STIR SPOT WELDING

A friction stir spot welding (FSSW) process is an emerging solid state joining process in which the material that is being welded does not melt. In this investigation an attempt has been made to understand the effect of tool shoulder diameter on the mechanical properties of the joint. For this purpose four welding tools diameter (10,13, 16 and 19) mm at constant preheating time and plunging time were used to carry out welding process. Effect of tool diameter on mechanical properties of welded joints was investigated using shear stress test and Microhardness of joint which welded was studied. Based on the stir welding experiments conducted in this study the results show that aluminum alloy (1200) can be welded using (FSSW) process with maximum welding efficiency (80%) shear strength using tool diameter(19mm) with rotation speed (900rpm)

A secure key distribution protocol based on hash functions and a quantum-authenticated channel using 6DP (KDP-6DP)

Security is the most tedious problem in highly sensitive communications. Quantum security is the key issue in solving the problem. A key distribution protocol based on the use of hash functions is proposed. The essential part of the protocol depends on sending a string of random characters from sender to receiver. Then, a selected hash or a cascade of two hash functions and a long-term shared secret are used to construct the key. Consequently, the session key is generated on-site by independently applying a hash function on the random string at the sender and receiver sides. This protocol requires a reliable method of authentication. Therefore, it is further proposed to use an out-of-band authentication methodology based on the deterministic six-state quantum authentication protocol that is referred to as 6DP

The Malaysia DREEM: perceptions of medical students about the learning environment in a medical school in Malaysia

BACKGROUND: Students’ perceptions of their learning environment, by defining its strengths and weaknesses, are important for continuous improvement of the educational environments and curriculum. Therefore, the aim of this study was to explore students’ perceptions of their learning environment, among medical students in Malaysia. Various aspects of the education environment were compared between year levels and sex. METHODS: This cross-sectional study was conducted at the Management and Science University, Shah Alam, Malaysia in 2012. A total number of 438 medical students participated in this study, and the response rate was 87.6%. Data were analyzed using SPSS. Comparisons of the mean scores of Dundee Ready Education Environment Measure (DREEM) subscales were calculated. The t-test was used to determine statistically significant differences. RESULTS: The majority of the study participants were female, Malay, and from year 3 (68.7%, 65.3%, and 55.7%; respectively). Analysis of each of the 50 items of the DREEM inventory showed that 47 items scored ranged between 2.00 and 3.00, and three items scored below 2.00. These were identified as problem areas in this medical school that are required to be critically addressed. The overall score showed that the medical students’ perceptions were positive. The students’ perception toward educational environment was positive for all five DREEM subscales. CONCLUSION: The study found that, in general, the perceptions of the participants about the learning environment were positive. Nevertheless, the study also found there is a need for curriculum improvement in this school and identified priority areas for such improvement

Randomness analysis of pseudo random noise generator using 24-bits LFSR

We have described in previous work the generation of PN-sequence by employing a 4-bit shifted Linear Feedback Shift Register (LFSR) for application into Direct Sequence Spread Spectrum (DSSS) system by simulation. In this paper, is proposed a pseudo random number generator (PRNG) circuit consisting of 24-bit shift registers (LFSR) which has much longer period to improve statistical properties. We simulated the LFSR circuit by using Multisim 11.0 and the pseudo random sequence generated is tested with statistical test of NIST Test suite. The sequence is passed the entire selected test and we concluded that our pseudo random sequence has long enough period to be considered as random. Keywords— Linear feedback shift register (LFSR), Pseudo random number generator (PRNG), pseudo random sequence, randomness tests, NIST SP800-22

Analysis of sequence variations in low-density lipoprotein receptor gene among Malaysian patients with familial hypercholesterolemia

<p>Abstract</p> <p>Background</p> <p>Familial hypercholesterolemia is a genetic disorder mainly caused by defects in the low-density lipoprotein receptor gene. Few and limited analyses of familial hypercholesterolemia have been performed in Malaysia, and the underlying mutations therefore remain largely unknown.</p> <p>We studied a group of 154 unrelated FH patients from a northern area of Malaysia (Kelantan). The promoter region and exons 2-15 of the LDLR gene were screened by denaturing high-performance liquid chromatography to detect short deletions and nucleotide substitutions, and by multiplex ligation-dependent probe amplification to detect large rearrangements.</p> <p>Results</p> <p>A total of 29 gene sequence variants were reported in 117(76.0%) of the studied subjects. Eight different mutations (1 large rearrangement, 1 short deletion, 5 missense mutations, and 1 splice site mutation), and 21 variants. Eight gene sequence variants were reported for the first time and they were noticed in familial hypercholesterolemic patients, but not in controls (p.Asp100Asp, p.Asp139His, p.Arg471Gly, c.1705+117 T>G, c.1186+41T>A, 1705+112C>G, Dup exon 12 and p.Trp666ProfsX45). The incidence of the p.Arg471Gly variant was 11%. Patients with pathogenic mutations were younger, had significantly higher incidences of cardiovascular disease, xanthomas, and family history of hyperlipidemia, together with significantly higher total cholesterol and low density lipoprotein levels than patients with non-pathogenic variants.</p> <p>Conclusions</p> <p>Twenty-nine gene sequence variants occurred among FH patients; those with predicted pathogenicity were associated with higher incidences of cardiovascular diseases, tendon xanthomas, and higher total and low density lipoprotein levels compared to the rest. These results provide preliminary information on the mutation spectrum of this gene among patients with FH in Malaysia.</p

Cross section measurement of t-channel single top quark production in pp collisions at root s=13 TeV

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Measurement of the top quark mass using single top quark events in proton-proton collisions at root s=8 TeV

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