http://hdl.handle.net/10453/101 Sat, 25 May 2013 16:09:21 GMT 2013-05-25T16:09:21Z http://hdl.handle.net/10453/19066 Oxidation of MDMA in urine after exposure to bleach Pham Annie Quynh Ngan; Fu Shanlin; Dawson Michael Dimitri Gerostamoulos; Jochen Beyer For the drug testing of MDMA (3,4-methylenedioxymethamphetamine or 'ecstasy') and other drugs of abuse, urine is generally the matrix of choice. However, the main issue concerned with urine drug testing is the lack of sample integrity due to acts of urine adulteration. A novel approach in the fight against urine adulteration is researched in this article, involving the use of LC-MS/MS (liquid chromatography-tandem mass spectrometry) to study and identify stable reaction products between the chemical reaction of MDMA and hypochlorite. Samples were analysed on an X Bridge C 18 column ( 150mm x 4.6mm, 3.51-Jm, Waters). Chromatographic separation was achieved at a tlow rate of 0.3ml/min using gradient elution involving 2mM ammonium formate solution in Milli-Q water and acetonitrile as the mobile phases. Kinetic experiments were performed whereby 11-JL of urinary reaction mixture was injected every 30min of reaction. One major reaction product, N-chloroMDMA, was formed and found to be unstable at room temperature (20°C), possibly reverting back into MDMA. It is suggested that bleach may possibly be able to oxidise a low dosage of MDMA to below cutoff concentration values and thus, conceal MDMA use. However, more research is required. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19066 2011-01-01T00:00:00Z http://hdl.handle.net/10453/19067 A sensitive method to detect and quantify delta-9 tetrahydrocannabinol in oral fluid by liquid chromatography - tandem mass spectrometry Molnar Anna; Fu Shanlin; Doble Philip; Lewis John Dimitri Gerostamoulos; Jochen Beyer Delta9 -tetrahydrocannabinol (THC) is the major psychoactive constituent of cannabis. It causes a decrease in motor function and concentration making it hazardous for an individual to drive whilst under the inftuence of this drug. Roadside testing procedures for cannabis are therefore necessary since it is the most widely used illicit drug in Australia and around the world and is commonly implicated in drug-driving offences. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/10453/19067 2011-01-01T00:00:00Z http://hdl.handle.net/10453/16077 Revisiting Key-swapping Collusion Attack on Distributed Sensor Networks Tran Thanh Dai; Agbinya Johnson Jaime Lloret Mauri, Jens Martin Hovem, Jean Philippe Vasseur, Cosmin Dini Recent study has demonstrated that quite a few well-know pairwise key establishment schemes are susceptible to key-swapping collusion attack aiming to subvert crucial applications that require cooperative efforts, e.g., data fusion algorithms, routing protocols, etc. Previous works against this attack have shown their own limitations. To overcome these limitations, we propose a new countermeasure in this paper. Our approach makes good use of symmetric-key cryptographic primitives and a hidden one-way hash chain to avoid unreasonable assumptions and/or costly methods, and guarantee network scalability. The intensive security analysis reveals that the countermeasure eliminates the possibility of the attack under normal conditions with only a tiny increase in under the worst case. This susceptibility can be eliminated by some additional mechanisms. Lastly, performance overheads are well justified by theoretical analyses and simulation to be suitable for current sensor node generations. Fri, 01 Jan 2010 00:00:00 GMT http://hdl.handle.net/10453/16077 2010-01-01T00:00:00Z http://hdl.handle.net/10453/16076 Availability Measure Model for Assistive Care Loop Framework Using Wireless Sensor Networks Balasubramanian Appiah Venkatakrishnan; Hoang Doan S. Marusic, M. Palaniswami, J. Gubbi, P. Corke Nowadays, body area wireless sensor networks (BAWSNs) applications are increasingly being used in in-house health monitoring systems. These applications have stringent timing requirements and often run continuously without interruptions. Hence, it becomes imperative to determine the operational continuity of the BAWSN applications by measuring their availability. The BAWSN applications rely on the collection of data within a critical time from all of the source sensor nodes rather than the data from an individual source. Subsequently, the measure of availability for a BAWSN application should be based on the time and the data delivery from all the sensor nodes. Taking into account these specific characteristics and the constraints of the BAWSN, we develop a model to measure the availability of a BAWSN application based on the unavailable time. The proposed model is evaluated through a series of experiments conducted in our existing Assistive Care Loop Framework (ACLF). Furthermore, we also develop an analogous theoretical model to evaluate the availability of a BAWSN application. Fri, 01 Jan 2010 00:00:00 GMT http://hdl.handle.net/10453/16076 2010-01-01T00:00:00Z