PROOF OF CONCEPT PROTOTYPE FOR A RAILROAD PEDESTRIAN WARNING SYSTEM USING WIRELESS SENSOR NETWORKS

Wireless sensor network is an emerging research topic due to its vast and ever-growing applications. Wireless sensor networks are made up of small nodes whose main goal is to monitor, compute and transmit data. The nodes are basically made up of low powered microcontrollers, wireless transceiver chips, sensors to monitor their environment and a power source. The applications of wireless sensor networks range from basic household applications, such as health monitoring, appliance control and security to military application, such as intruder detection. The wide spread application of wireless sensor networks has brought to light many research issues such as battery efficiency, unreliable routing protocols due to node failures, localization issues and security vulnerabilities. This report will describe the hardware development of a fault tolerant routing protocol for railroad pedestrian warning system. The protocol implemented is a peer to peer multi-hop TDMA based protocol for nodes arranged in a linear zigzag chain arrangement. The basic working of the protocol was derived from Wireless Architecture for Hard Real-Time Embedded Networks (WAHREN)

The Effect of Procedural Changes on the Rate of Clinical Alarms In the Intensive Care Unit

Clinical alarms have become an indispensable part of medical environment, but issues related to alarm artifacts, false alarms, and alarm fatigue have been identified. A national online survey administered to hospitals stated healthcare workers determined that 81% of respondents agreed that alarms occur frequently, 77% agreed that excessive clinical alarms disrupt patient care, and 78% agreed that reduced trust in alarms cause caregivers to disable them (Korniewicz, Clark, & David, 2008). Studies have suggested that preparation of skin of the patient improves electrode-skin contact, thereby resulting in fewer artifacts (Hermens, Freriks, Disselhorst-Klug, & Rau, 2000). Additionally, clinical studies have shown that the electrode-skin interface is frequently overlooked as a major source of artifact affecting many electro-physiologic recordings (Oster, 1998). The purpose of the thesis is to evaluate how the implementation of procedural changes, specifically implementing a patient\u27s chest preparation procedure prior to electrode placement influences the rate of clinical alarms, (i.e., critical or warning cardiac alarms) in an intensive care unit (ICU). Data from clinical alarms were collected from a regional hospital in South Carolina. The data contained the number of clinical alarms recorded with and without nurse administered chest preparation. Functional data analysis was used to evaluate if chest preparation procedure had a significant impact on the rate of clinical alarms produced over an 8-hour shift. The results suggest that there is no significant reduction in the alarm frequency after the implementation of nurse administered chest preparation. However, a nominal decrease in the number of alarms per hour per patient and some preliminary trends were observed during the data analysis that warrants the need for future research in this direction

Identifying bottlenecks in supply chains using visual analysis

Confidential until 24. May 202

Investigation and analysis of main effect and interaction effect for turning of Aluminium alloy Al7050

No Abstrac

Bharath hub number of graphs

The mathematical model of a real world problem is designed as Bharath hub number of graphs. In this paper, we study the graph theoretic properties of this variant. Also, we give results for Bharath hub number of join and corona of two connected graphs, cartesian product and lexicographic product of some standard graphs.Publisher's Versio

ANTIDIABETIC EFFECTS OF A SERIES OF CURCUMIN PYRAZOLES IN-VITRO

Objective: To investigate the antidiabetic potential of a series of curcumin pyrazole derivatives in-vitro.Methods: The in-vitro antidiabetic ability of curcumin pyrazole derivatives (3a-3e) was evaluated by the inhibition studies of the digestive enzymes;including alpha-amylase, rat intestinal alpha-glucosidase, and sucrase. The glucose lowering effect of the compounds was further assessed by theglucose uptake assay using a porcine diaphragm.Results: The curcumin pyrazole derivatives (3a-3e) showed a prominent inhibition of the enzymes studied. Compounds 3a and 3b were found tobe more pronounced in their hypoglycemic effects and 3b exhibited the maximum enzyme inhibitory activity. The glucose uptake through porcinediaphragm was extensively promoted by the compounds 3a and 3b than the other compounds in the series.Conclusion: The results suggest that the pyrazole derivatives of curcumin 3a and 3b have potent hypoglycemic properties. These compounds in theseries of curcumin pyrazole derivatives (3a-3e) can be selected for further in-vitro and in vivo studies.Keywords: Diaphragm, Insulin, Hypoglycemic, Enzyme inhibition

Strain measurement by contour analysis

Background: The determination of yield stress curves for ductile metals from uniaxial material tests is complicated by the presence of tri-axial stress states due to necking. A need exists for a straightforward solution to this problem. Objective: This work presents a simple solution for this problem specific to axis-symmetric specimens. Equivalent uniaxial true strain and true stress, corrected for triaxiality effects, are calculated without resorting to inverse analysis methods. Methods: A computer program is presented which takes shadow images from tensile tests, obtained in a backlight configuration. A single camera is sufficient as no stereoscopic effects need to be addressed. The specimen's contours are digitally extracted, and strain is calculated from the contour change. At the same time, stress triaxiality is computed using a novel curvature fitting algorithm. Results: The method is accurate as comparison with manufactured solutions obtained from Finite Element simulations show. Application to 303 stainless steel specimens at different levels of stress triaxiality show that equivalent uniaxial true stress -- true strain relations are accurately recovered. Conclusions: The here presented computer program solves a long-standing challenge in a straightforward manner. It is expected to be a useful tool for experimental strain analysis