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Guide-wire embolism during subclavian vein catheterization by Seldinger technique
Narendra H,Baghavan K
Indian Journal of Critical Care Medicine , 2006,
Abstract: Percutaneous cannulation of central veins by Seldinger technique is a popular approach in intensive care settings. We report a case of embolization of a complete guide-wire during such a procedure. Our case differs from the few earlier reported cases in that subclavian vein was the entry site. While reviewing the available literature, we discuss few reasons and management of such a mishap.
Design and Analysis of a Novel Digital Image Encryption Scheme
Narendra K Pareek
International Journal of Network Security & Its Applications , 2012,
Abstract: In this paper, a new image encryption scheme using a secret key of 144-bits is proposed. In the substitution process of the scheme, image is divided into blocks and subsequently into color components. Each color component is modified by performing bitwise operation which depends on secret key as well as a few most significant bits of its previous and next color component. Three rounds are taken to complete substitution process. To make cipher more robust, a feedback mechanism is also applied by modifying used secret key after encrypting each block. Further, resultant image is partitioned into several key based dynamic sub-images. Each sub-image passes through the scrambling process where pixels of sub-image are reshuffled within itself by using a generated magic square matrix. Five rounds are takenfor scrambling process. The propose scheme is simple, fast and sensitive to the secret key. Due to high order of substitution and permutation, common attacks like linear and differential cryptanalysis are infeasible. The experimental results show that the proposed encryption technique is efficient and has high security features.
Design and Analysis of a Novel Digital Image Encryption Scheme
Narendra K Pareek
Computer Science , 2012, DOI: 10.5121/ijnsa.2012.4207
Abstract: In this paper, a new image encryption scheme using a secret key of 144-bits is proposed. In the substitution process of the scheme, image is divided into blocks and subsequently into color components. Each color component is modified by performing bitwise operation which depends on secret key as well as a few most significant bits of its previous and next color component. Three rounds are taken to complete substitution process. To make cipher more robust, a feedback mechanism is also applied by modifying used secret key after encrypting each block. Further, resultant image is partitioned into several key based dynamic sub-images. Each sub-image passes through the scrambling process where pixels of sub-image are reshuffled within itself by using a generated magic square matrix. Five rounds are taken for scrambling process. The propose scheme is simple, fast and sensitive to the secret key. Due to high order of substitution and permutation, common attacks like linear and differential cryptanalysis are infeasible. The experimental results show that the proposed encryption technique is efficient and has high security features.
MySQL based selection of appropriate indexing technique in hospital system using multiclass SVM
Narendra Kohli, Nishchal K Verma
International Journal of Engineering, Science and Technology , 2010,
Abstract: This paper deals with selection of appropriate indexing technique applied on MySQL Database for a health care system and related performance issues using multiclass support vector machine (SVM). The patient database is generally huge and contains lot of variations. For the quick search or fast retrieval of the desired information from the database, it becomes exigent to select and implement the appropriate indexing technique. Multiclass SVM is proposed to be the optimal solution as SVM could be trained with patient datasets to select the appropriate indexing method in the database of MySQL. B-Tree index is directly applied in most of the cases but other indexing techniques such as Bitmap and Hash are also used as per requirement. Using SVM, corresponding to the given search parameter for information, retrieval of information from the patient database results in quick retrieval of required information in the minimum processing time. Various SVM based methods like one against one, one against all, and fuzzy decision function are implemented for classification on standard electrocardiogram (ECG) datasets chosen from the University of California at Irvine (UCI) Cardiac Arrhythmias database. Suitable SVM method to be used is highlighted in the result section. Depending upon different feature values of ECG dataset, the SVM is trained to identify which categories or classes the given data points belong to. In the similar way appropriate indexing techniques will be selected in the case of health care system application by using multiclass SVM for fast retrieval of patient data. If the findings are made an integral part of the hospital system it could facilitate quick and easy retrieval of patient information, doctor information, hospital information etc. from any hospital as per the requirement. Health care system applications will be developed as front end in .Net whereas, back end as database in MySQL. International Journal of Engineering, Science and Technology, Vol. 2, No. 6, 2010, pp. 119-130
Mechanism of Trees / Bushes Like Pattern in Chemical System
P. K. Srivastava,Narendra Yadav
Journal of Chemistry , 2009, DOI: 10.1155/2009/579843
Abstract:
Synthesis of Polypyrrole Using Ferric Chloride (FeCl3) as Oxidant Together with Some Dopants for Use in Gas Sensors  [PDF]
Hemant K. Chitte, Ganesh N. Shinde, Narendra V. Bhat, Vasant E. Walunj
Journal of Sensor Technology (JST) , 2011, DOI: 10.4236/jst.2011.12007
Abstract: Polypyrrole (Ppy) was synthesized using Ferric Chloride (FeCl3) as oxidant. The ratio of monomer to oxidant was 1:2.4. The polymerization was carried out at 5C. Attempts were made to increase the electrical conduc-tivity by using various dopants viz. Lithium per Chlorate (LiClO4), para-Toluene Sulfonate (p-TS) and Nap-thalene Sulfonic acid (NSA). The materials were characterized using FTIR, X-Ray diffraction and SEM. The electrical conductivity was measured by two probe method and was found to be in the range of 10-3 to 10-2 S/cm. Thin films of these preparations were casted on the interdigited electrodes to study the detection of gases such as ammonia and LPG. It was found that for the pure Ppy and one doped with LiClO4, when ammonia gas was allowed to flow in, there was a sudden increase in the current, which decreased rapidly when gas was stopped. This behavior is in contradiction to that observed in earlier investigations where Ppy was prepared by electrochemical method. However when Ppy doped with p-TS and NSA were used, the trend was reversed. Similarly it was noted that for pure Ppy and one doped with LiClO4, p-TS and NSA there was an increase in the current when LPG gas was brought in. However the response to LPG was somewhat low as compared ammonia gas.
Synthesis of Polypyrrole Using Ammonium Peroxy Disulfate (APS) as Oxidant Together with Some Dopants for Use in Gas Sensors  [PDF]
Hemant K. Chitte, Narendra V. Bhat, Mr. Ajit V. Gore, Ganesh N. Shind
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.210201
Abstract: Polypyrrole (Ppy) was synthesized using Ammonium Peroxy Disulfate (APS) as oxidant in a standard ratio of monomer to oxidants at 5℃. Attempts were made to increase the electrical conductivity by using various dopants viz. Lithium per Chlorate (LiClO4), para-Toluene Sulfonate (p-TS) and Napthalene Sulfonic acid (NSA). The materials were characterized using FTIR, X Ray diffraction and SEM. The electrical conductivity was measured by two probe method and was found to be in the range of 10-3 S/cm. Thin films of these preparations were casted on the interdigited electrodes to study the detection of gas such as ammonia. It was found that for the pure Ppy when ammonia gas was allowed to flow in, there was a sudden increase in the current, which decreased rapidly when gas was stopped. However when Ppy doped with p-TS, NSA and LiClO4, the trend was reversed.
Synthesis and Characterization of Polymeric Composites Embeded with Silver Nanoparticles  [PDF]
Hemant K. Chitte, Narendra V. Bhat, Narayan S. Karmakar, Dushyant C. Kothari, Ganesh N. Shinde
World Journal of Nano Science and Engineering (WJNSE) , 2012, DOI: 10.4236/wjnse.2012.21004
Abstract: Silver nanoparticles were synthesized by chemical reduction method. The Ag nanoparticles (AgNP) were characterized using UV-Vis spectroscopy which shows an absorption band at 420 nm confirming the formation of nanoparticles. For any practical application of the silver nanoparticles it is necessary to stabilize it which can be done by making a composite. In the present studies three polymers were chosen such that AgNP could be put to some practical use. Polyvinyl Alcohol (PVA), Polypyrrole (Ppy) and Carboxymethyl cellulose (CMC) are important for use in textiles, electronics and food/drug technologies respectively. Polymeric composites of PVA, PPy, and CMC were prepared by mixing the aqueous solutions of the respective polymers and the colloidal suspension of preformed silver nanoparticles. Various compositions containing 1% to 5% of Ag nanoparticles were prepared. Thin films of these composites were characterized by UV-Vis spectroscopy, X-ray diffraction and Scanning electron microscopy. X-ray diffraction showed the presence of the peaks at 2θ values of 38.1°, 44.2°, 64.4 and 78.2° corresponding to cubic phase of silver metal. SEM photographs revealed the presence of Ag nanoparticles of sizes varying from 40 to 80 nm. The electrical conductivity of these materials was studied using the four probe method. The conductivity was found to increase from 10–6 for control samples to 10–3 S/cm after the formation of the nanocomposites.
A Rare Association of Congenital Diaphragmatic Hernia with Lower Esophageal Atresia and Perforation
Narendra Kumar Are,K. Nagarjuna,Lavanya Kannaiyan
International Journal of Pediatrics , 2010, DOI: 10.1155/2010/738546
Abstract: Congenital diaphragmatic hernia is known to be associated with esophageal atresia, which is a rare association. We report a rare occurrence of congenital diaphragmatic hernia and lower esophageal atresia.
The role of nanosized gold particles in adsorption and oxidation of carbon monoxide over Au/Fe2O3 Catalyst
Narendra M Gupta,Arvind K Tripathi
Gold Bulletin , 2001, DOI: 10.1007/BF03214824
Abstract: Thermochemical measurements reveal that the oxidation of carbon monoxide on both Fe2O3 and Au/Fe2O3 occurs via similar redox mechanisms, involving the abstraction and replenishment of lattice oxygen, where the presence of nanosize gold particles promotes these processes. This is attributed to their capacity to adsorb carbon monoxide because of their inherent defective structural sites. It is suggested that the energy that evolves during chemisorption of CO is responsible for the surge in temperature at the Au-Fe2O3 interfaces, which in turn serve as sites for the accelerated reaction between CO and the support. The role of gold particle size is discussed in terms of the effect of geometry of surface metal atoms in the nanosize clusters.
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