Time synchronization schemes in Wireless Sensor Networks have been subjected to various security threats and attacks. In this paper we throw light on some of these attacks. Nevertheless we are more concerned with the pulse delay attack which cannot be countered using any of the cryptographic techniques. We propose an algorithm called Resync algorithm which not only detects the delay attack but ...

We focus on synthesis techniques for transforming existing fault-intolerant real-time programs into fault-tolerant programs that provide phased recovery. A faulttolerant program is one that satisfies its safety and liveness specifications as well as timing constraints in the presence of faults. We argue that in many commonly considered programs (especially in mission-critical systems), when fau...

We present a generalization of the Hidden Number Problem and generalize the Boneh-Venkatesan method [BV96, Shp05] for solving it in polynomial time. We then use this to mount a key recovery attack on LWE which runs in polynomial time using the LLL lattice basis reduction algorithm. Success can be guaranteed with overwhelming probability for narrow error distribution when q ≥ 2, where n is the d...

Real-time databases are increasingly being used as an integral part of many computer systems. During normal operation, transactions in real-time databases must execute in such a way that transaction timing and data time validity constraints can be met. Real-time databases must also prepare for possible failures and provide fault tolerance capability. Principles for fault tolerance in real-time ...

we studied the effects of a single ketamine injection in an experimental model of chronic hypernatraemia in rats. three groups, each of 20 male wistar rats were chosen for the experiment; the control group was given water and the test groups were given 1% (group 1) and 2% (group 2) nacl solutions for two weeks. all groups were fed with the same diet, containing about 0.5% salt. other living con...

it is generally believed that unaccustomed exercise causes myofibrillar damage. in recent years, cold water immersion (cwi) following heavy training sessions and matches has been common aiming at reducing soreness. however, there is no strong scientific rationality if this method really accelerates recovery after exercise. in addition, there is a question that if it is possible for this method ...

objective: to evaluate the current scientific evidence for the applicability, safety and effectiveness of pathways of enhanced recovery after emergency surgery (eras). methods: we undertook a search using pubmed and cochrane databases for eras protocols in emergency cases. the search generated 65 titles; after eliminating the papers not meeting search criteria, we selected 4 cohort studies and ...

Abstract: Dissolution and recovery of Mn-Al compacts with and without a chloride flux was studied by taking samples from the melt after addition of the compact. Events occurring after the addition of the compacts into the melt were studied using water quenched specimens after holding them for a specified time in molten state. The cross sections of these specimens were characterized by SEM a...

Background: Treatment of ionizing radiation combined with chemical agents can enhance the inactivation of cells. The aim of this study was to determine the parameters involved in the inhibition of cell recovery. Materials and Methods: A mathematical model describing the process of recovery as a decrease in the effective radiation dose was used. The model includes two parameters, recovery consta...