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Human-Mobility-Based Spray and Wait: Efficient Routing Protocol for Pocket Switched Networks
Namita Mehta,Mehul Shah 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.1
Delay and/or Disruption-Tolerant Networking (DTN) is a novel communication prototype that can span across multiple networks and deal with unpredicted conditions in the Internet model. Pocket Switched Networks (PSN) are delay tolerant networks with hand held devices. Nodes in a PSN make use of a store-carry-and-forward paradigm to communicate along with themselves. The routing protocols performances that have been developed for DTN based on the movement pattern of the nodes. We propose a Human Mobility based Spray & Wait Routing protocol (HMSaW). This protocol makes use of truncated power law distribution of pause time and flight length of human mobility to smartly forward data in DTN and PSN. Simulation results show that the proposed HMSaW shows better delivery ratio and the communication overhead, with marginal reduction in average delay compared to existing PROPHET and Spray & Wait Routing protocol.
On the security of pairing-free certificateless digital signature schemes using ECC
Namita Tiwari 한국통신학회 2015 ICT Express Vol.1 No.2
I cryptanalyze the pairing-free digital signature scheme of Islam et al. which is proven secure against “adaptive chosen message attacks”. I introduce this type of forgery to analyze their scheme. Furthermore, I comment on general security issues that should be considered when making improvements on their scheme. My security analysis is also applicable to other digital signatures designed in a similar manner.
Namita Dutta Gupta,Supratim Maity,Kalyan Kumar Chattopadhyay 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Polypyrrole–multiwalled carbon nanotubes (PPy–MWCNT) nanocomposites with high field emission characteristics have been fabricated by a very simple and effective in situ chemical polymerization technique that bypasses the need of de-agglomerating the MWCNT. Based on structural characterization, we have proposed formation of a three tier structure of PPy–MWCNTs composite with granular PPy on the top. Field emission studies, explained on the basis of band bending at the PPy–MWCNT interface, show drastic increase of field enhancement factor (~4664) and low turn on field (1.7 V/mm), opening new possibilities of improvement of PPy/PPy–MWCNT composites.
Namita Goswami,Jung Hoon Han,Richard A. Holley 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.2
Antimicrobial coating on chicken carcasses may reduce the effects of cross-contamination and improve product shelflife and safety. Thyme oil was mixed at 0.5%(v/v) with a pre-gelatinized pea starch coating solution. The coating solution was spread on chicken breast meat after inoculation with selected spoilage and pathogenic bacteria. After inoculation, the chicken meats were packaged in plastic bags and stored at 4℃. During 12 day storage, total aerobic bacteria, lactic acid bacteria, and inoculated organisms were counted at 4 day intervals. Thyme oil treatments reduced the viability of Salmonella as well as the growth of Listeria and Pseudomonas by 2 log CFU/g, and appeared to eliminate inoculated Campylobacter during storage. The addition of thyme oil increased the viscosity of the pre-gelatinized pea starch solution. The results suggested that thyme oil inclusion in an edible starch coating may be a satisfactory delivery system to enhance the safety of processed fresh meat.
Namita Kalra,Apoorva Rathore,Rishi Tyagi,Amit Khatri,Deepak Khandelwal,Padma Yangdol 대한치과마취과학회 2023 Journal of Dental Anesthesia and Pain Medicine Vol.23 No.6
Background: Eye movement desensitization and reprocessing (EMDR) therapy has been reported to be very efficacious for treating post-traumatic stress disorder (PTSD) and other anxiety-related conditions. However, a review of the literature reveals the sparse use of this therapy in the field of pediatric dentistry. This study aimed to evaluate anxiety trends in pediatric dental patients during local anesthesia and extraction with and without EMDR therapy. Methods: Children in the age range of 8–12 years who required dental extractions were assigned randomly into two groups: an EMDR group (group 1) and a routine behavior management therapy group (group 2; receiving more traditional interventions such as tender love and care behavioral modeling, and distraction). Anxiety scores were recorded at four levels using the visual facial anxiety scale (VFAS) preoperatively, after therapy, after the administration of local anesthesia (LA), and after extraction. Results: Reduced anxiety was observed after the delivery of EMDR therapy, after LA administration, and post-extraction in the EMDR group compared to pre-operative anxiety scores of anxiety (P < 0.001; unpaired Student’s t and Mann-Whitney U tests). In the control group, mild reductions in anxiety after routine behavior management therapy were observed, accompanied by spikes in anxiety levels after LA and extractions. Conclusion: EMDR therapy was found to be valuable for reducing anxiety among pediatric dental patients during tooth extraction procedures.
Active control of delaminated composite shells with piezoelectric sensor/actuator patches
Namita Nanda,Y. Nath 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.2
Present study deals with the development of finite element based solution methodology to investigate active control of dynamic response of delaminated composite shells with piezoelectric sensors and actuators. The formulation is based on first order shear deformation theory and an eight-noded isoparametric element is used. A coupled piezoelectric-mechanical formulation is used in the development of the constitutive equations. For modeling the delamination, multipoint constraint algorithm is incorporated in the finite element code. A simple negative feedback control algorithm coupling the direct and converse piezoelectric effects is used to actively control the dynamic response of delaminated composite shells in a closed loop employing Newmark’s time integration scheme. The validity of the numerical model is demonstrated by comparing the present results with those available in the literature. A number of parametric studies such as the locations of sensor/actuator patches, delamination size and its location, radius of curvature to width ratio, shell types and loading conditions are carried out to understand their effect on the transient response of piezoceramic delaminated composite shells.
Namita Mehta,Mehul Shah 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.1
Delay and/or Disruption-Tolerant Networking (DTN) is a novel communication prototype that can span across multiple networks and deal with unpredicted conditions in the Internet model.Delay-tolerant networks (DTNs) are partitioned wireless ad hoc networks with intermittent connectivity. Additional terminology in this family of dynamic networks includes disruption-tolerant networks, intermittently connected networks, and opportunistic networks. Routing of the packets in DTN is based on store-carry-and forward paradigm. In this paper, we study and analyze performance of well known PROPHET and Spray and Wait routing protocol, under different human mobility models such as Truncated Levy Walk mobility model (TLW),Self-similar Least Action Walk (SLAW) and Random way point (RWP) model. The MATLAB simulator is used in order to analyze the performance of these routing protocols.Simulation results illustrate that Spray and Wait significantly outperforms the PROPHET on aspects of delivery ratio, average delay and communication overhead.