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Search Results: 1 - 10 of 8764 matches for " Sanjeev Sharma "
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A New Record on Flowering in Harar (Terminalia chebula Retz.) Seedling  [PDF]
Kamal Sharma, Sanjeev Thakur, Seema Sharma, Som Dutt Sharma
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.35083
Abstract: Harar (Terminalia chebula), a large deciduous tree belongs to family combretaceae. It grows naturally in greater part of India up to 1500 m elevation. Due to several alkaloids present in fruit, it is used as laxative, purgative and astringent for curing a number of ailments. Keeping in view its medicinal and tanning properties, the authors have been working for the last two decades on various aspects like propagation and development of promising strains of harar. Grafting/budding techniques have been standardized to produce true to type precocious plants which bear flower in two to three years. However, flowering has been observed in three months old seedling, which can be ascribed to biochemical and/or cellular changes. Early flowering is a rare incidence in tree seedlings which otherwise could be very useful for breeding and early evaluation of fruit species.
Nanoparticle Paclitaxel (Nanoxel) as a Safe and Cost-Effective Radio-Sensitizer in Locally Advanced Head and Neck Carcinoma  [PDF]
Akshay Nigam, Anupama Sharma, Sanjeev Kumar Singh
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.31006
Abstract: Squamous cell carcinoma of the head and neck (SCCHN) is a common malignancy. It is the 7th most common malignancy. Approximately 45,000 new cases are diagnosed each year in the USA. In present study 10 patients were selected of age group between 40 - 60 years from Gwalior-Chambal region, among them 3 were females and 7 were males. 3 patients were suffering from tonsilitis, 4 from Laryngeal carcinoma, 2 from carcinoma in maxillary antrum and 1 patient was suffering from carcinoma of whole tongue. The aim of present study is to evaluate the safety of nanoparticle paclitaxel (Nanoxel, a plant alkaloid) in combination with radiation in the treatment of locally advanced head and neck carcinoma. Further the patients were divided in 2 groups. The 1st group received nanoxel (plant alkaloid) administered concomitantly with radiation therapy. 2nd group received gemcitabine administered in combination with radiation therapy. 9 patients showed response for the therapy. The adverse effects in arm A, 2 patients showed anemia less than 8 gm of Hemoglobin, 2 patient showed leucopenia and 1 patient showed diarrhoea, Nausea/vomiting were shown by 4 patients, in arm B, 1 patient showed leucopenia, 1 patient showed anemia less than 9 gm hemoglobin and 5 patient showed sensory neuropathy. Nanoxel (plant alkaloid) showed best results in the case of head and neck carcinoma. The dose of 30 mg/kg b.w showed best safety with best clinical effect in term of less time of patient admission (hardly 30 mins) with less side effects with greater clinical effects in our study.
Administration of Levothyroxine 45 - 60 Minutes before Breakfast Improves Biochemical Availability as Evidenced by Reduced Thyrotropin Levels  [PDF]
Shivshankar Seechurn, Sanjeev Sharma, Samson Oyibo
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2012, DOI: 10.4236/ojemd.2012.23005
Abstract: Introduction: Serum Thyrotropin (TSH) level is used to assess adequacy of levothyroxine dosing for patients with hypothyroidism. Some patients have raised TSH levels despite being on an adequate dose of levothyroxine (100 mcg/day - 200 mcg/day). Aim: To evaluated the effect of advising patients to take their levothyroxine 45 - 60 minutes before breakfast on raised serum TSH levels. Patients and Methods: Rather than increase the dose, patients with raised TSH levels were asked to take their levothyroxine at least 45 - 60 minutes before breakfast and other oral medications. Thyroid Function Tests were assessed at base line and repeated after two months. Results: Data from ten patients who presented between 2008 and 2010 were analyzed (9 females, 1 male): With median (IQR) age: 39 (33 - 49) years and duration of hypothyroidism: 6 (3 - 7.8) years. Median (IQR) levothyroxine dose was 175 (144 - 250) mcg, serum free-Thyroxine (free-T4): 13 (10.5 - 17.1) pmol/L and serum TSH: 12.63 (6.2 - 48.3) mIU/L. After two months all patients demonstrated biochemical improvement; a decrease in serum TSH to 3.15 (0.4 - 6.1) mIU/L accompanied by an increase in serum free-T4 to 17.7 (14.8 - 21.3) pmol/L. Both changes were statistically significant (p < 0.05 and p < 0.01, respectively). The median (IQR) percentage TSH reduction was 83.5 (40.3 - 95.8) mIU/L and this bore no significant correlation with the initial TSH level (rs = 0.2, p = 0.58). Conclusion: Changing levothyroxine administration to 45 - 60 minutes before breakfast and other oral medications reduced TSH levels by 40% - 96% in all patients. We recommend this advice for all patients with hypothyroidism on adequate doses of levothyroxine but still appear biochemically under-replaced.
Identification of Critical Factors in Checkpointing Based Multiple Fault Tolerance for Distributed System
Sanjay Bansal,Sanjeev Sharma
Journal of Emerging Trends in Computing and Information Sciences , 2011,
Abstract: Performance of a checkpointing based multiple fault tolerance is low. The main reason is overheads associate with checkpointing. A checkpointing algorithm can be improved by improved storing strategy and checkpointing scheduling. Improved storage strategy and checkpointing scheduling will reduce the overheads associated with checkpointing. Performance and efficiency is most desirable feature of recovery based on checkpointing. In this paper important critical issues involved in fast and efficient recovery are discussed based on checkpointing. Impact of each issue on performance of checkpointing based recovery is also discussed. Relationships among issues are also explored. Finally comparisons of important issues are done between coordinated checkpointing and uncoordinated checkpointing.
Performance Improvement of TCP in MANETs
Mandakini Tayade,,Sanjeev Sharma
International Journal of Engineering Science and Technology , 2011,
Abstract: Ad hoc network is the collection of mobile devices forming a temporary network without an internet need for a centralized infrastructure or access point and any node can be connected to network temporarily. To support mobility, in ad hoc network node communicates by wireless channel. In this temporary link failures and route changes happen frequently, so temporary link outages or fadinginduced bit errors will result in packet losses. The Transmission Control Protocol (TCP) was designed to provide reliable end-to-end delivery of data over unreliable networks. Some variations of TCP have been developed to improve the transport protocol erformance for wire network. TCP is a transport protocol formally designed for the wired Internet and it is known to suffer from erformance degradation in Adhoc networks environment. We study the performance of different approaches in order to improve the TCP throughput performance and reviews best method for wireless TCP for Ad hoc Networks.
Error Probability of Different Modulation Schemes for OFDM based WLAN standard IEEE 802.11a
sanjeev kumar,Swati Sharma
International Journal of Engineering , 2010,
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a key technique for achieving high data rates and spectral efficiency requirements for wireless communication systems. This paper presents a modeling and simulation of OFDM based on WLAN standard (IEEE 802.11a). Performance of OFDM is evaluated for different modulation schemes such as PSK, QAM, DQPSK, and OQPSK. The performance of OFDM is compared in terms of BER vs SNR for different modulation formats.
Performance Comparison of TCP Variants in Mobile Ad- Hoc Networks
Mandakini Tayade,Sanjeev Sharma
International Journal of Computer Science and Information Security , 2011,
Abstract: Mobile Ad-Hoc networks (MANETs) are characterized by self organized, adaptive and multihop wireless link; frequently changing network topology due to mobility support. Transmission Control Protocol (TCP) is connection oriented, reliable, congestion control and end to end mechanism. In TCP due to network congestion and link failure packets are losses and TCP tries to control this loss. In this article we present the performance comparison of existing TCP variants: TCP Tahoe, Reno, Lite, and New Reno for mobile ad-hoc networks. The behavior of TCP was different depending on the type of TCP variants because of improper activation or missing of congestion control. This analysis and comparisons are necessary to be aware of which TCP implementation is better for a specific scenario.
BER Performance Evaluation of FFT-OFDM and DWT-OFDM
Swati Sharma,Sanjeev Kumar
International Journal of Network and Mobile Technologies , 2011,
Abstract: Orthogonal frequency division multiplexing (OFDM) is a special form of multi carrier transmission which has found its application in a number of wireless and wireline systems. In an OFDM scheme, a large number of orthogonal, overlapping, narrow band sub-channels or subcarriers, transmitted in parallel, divide the availabletransmission bandwidth. The separation of the subcarriers is theoretically minimal such that there is a very compact spectral utilization. This paper presents the overview and then the performance evaluation results of an OFDM system by using Fast Fourier Transform (FFT) and Discrete Wavelet Transform (DWT). The results presented in the paper are based on computer simulations performed using Matlab; a highly efficient tool for different applications.
Improve Performance of TCP New Reno Over Mobile Ad-Hoc Network Using ABRA
Dhananjay Bisen,Sanjeev Sharma
International Journal of Wireless & Mobile Networks , 2011,
Abstract: In a mobile ad hoc network, temporary link failures and route changes occur frequently. With theassumption that all packet losses are due to congestion, TCP performs poorly in such an environment.There are many versions of TCP which modified time to time as per need. In this paper modificationsintroduced on TCP New Reno over mobile ad-hoc networks using calculation of New RetransmissionTime out (RTO), to improve performance in term of congestion control. To calculate New RTO, adaptivebackoff response approach (ABRA) in TCP New Reno was applied which suggest ABRA New Reno. Itutilizes an ABRA by which congestion window and slow start threshold values were decreased wheneveran acknowledgement is received and new backoff value calculate from smoothed round trip time.Evaluation based on comparative study of ABRA New Reno with other TCP Variants like New Reno andReno was done using realistic parameters like TCP Packet Received, Packet Drop, Packets Retransmitted,Throughput, and Packet Delivery Ratio calculated by varying attributes of Node Speed, Number of Nodesand Pause Time. Implementation and simulations were performed in QualNet 4.0 simulator.
An Agent Based Energy Efficient Local Monitoring
Rahul Dubey,Sanjeev Sharma
International Journal of Soft Computing & Engineering , 2011,
Abstract: Local monitoring is the one of the powerful technique for improving the security in multihope Wireless Sensor Network (WSN).Although it is a good technique for security purpose in WSN but it has a major drawback that it is costly in terms of energy consumption which make overhead for the energy constrained system such as WSN. In WSN environment, the scarce power resources are typically addressed through sleep- wake scheduling of nodes but sleep-wake technique is vulnerable even to simple attacks .In this paper a new technique is proposed that is not only energy efficient but also a secure technique which combine the sleep wake up scheduling with local monitoring which we call the OD –AEELMO (On Demand Agent Based Energy Efficient Local Monitoring ).it enables sleep- wake management in secure manner even in face of adversarial nodes that choose not to awaken nodes responsible for monitoring their traffic.
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