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RISS 인기검색어
- 검색키워드
- 저자 : Shweta Sharma (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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QR Code Steganography for Multiple Image and Text Hiding using Improved RSA-3DWT Algorithm
Shweta Sharma,Prof. Vikas Sejwar 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.7
In this research, we presented another implanting calculation for QR Code Image Steganography and Text Hiding, which is based on 3-discrete wavelet transform (DWT) and improved RSA algorithm. Firstly, enter the text message and choose four random numbers for RSA encryption. After that, take four pictures: one is cover image and another is secret image. In the process of embedding, we divide RGB image into three planes: Red, Green and Blue. In this work, embed multiple color secret images into a single cover image for providing security. At last, encrypted text message is concealed into an embedded picture using Least significant bit (LSB). We evaluate performance on the basis of the peak signal noise ratio (PSNR) and structural similarity matrix (SSIM) with different varying weights. In this proposed, compared this algorithm to 1-DWT. In the extraction process, recover three secret image from stego image and decrypt text message.In this experiment, improved PSNR value as compared to previous paper. The experimental outcomes will be reached upto 84%. In our method, DWT is applied to decompose the cover image and produce the low and high frequency coefficients to take benefits of robustness and security goods.
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Red Upconversion Luminescence and Paramagnetism in Er/Yb Doped SnO2
Shweta Sharma,Jyoti Shah,R.K. Kotnala,Santa Chawla 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
Red upconversion luminescence has been introduced in functional semiconductor SnO2 by doping rare earth ions Er3+ and Yb3+ and using 980 nm diode laser as pump source. High temperature solid state reaction leads to incorporation of trivalent lanthanide ions in SnO2. For high concentrations of lanthanide doping,partial reduction of Sn4+ to Sn2+ occurs for charge compensation making the material system SnO2-SnO alloy. Upconverting SnO2 exhibits paramagnetic characteristics with magnetization increasing with introduction of trivalent rare earth ions Er3+/Yb3+.
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The Association of Ponticulus Posticus & Elongated Styloid Process with Headaches
Sharma, Shivani,Nagaraju, Rakesh,Sharma, Shweta Korean Academy of Orofacial Pain and Oral Medicine 2018 Journal of Oral Medicine and Pain Vol.43 No.3
Purpose: The present study was designed to investigate the association of ponticulus posticus (PP) and elongated styloid process (ESP) with headaches. Methods: Analysis of head and neck cone beam computed tomography samples from the archives of the Department of Oral Radiology was done for the presence of partial or complete PP and ESP length, type, thickness, mediolateral angulation, anterioposterior angulation (horizontal & vertical), lateral or medial curvature. This was followed by personal & telephonic questionnaires to the subjects for the evaluation of the presence of headaches & other associated symptoms. Results: Among 134 subjects, 62 subjects (46.3%) presented with headache and 72 subjects (53.7%) did not have any headache. On further analysing the total 62 subjects with headache, it was found out that 31 subjects (50.0%) of them had ESP and PP both, 16 subjects (25.8%) had only ESP, and 15 subjects (24.2%) had only PP. A strong association was present between headache and presence of PP & ESP individually and together. Conclusions: All health care professionals dealing with the head and neck pain disorders should also consider the presence of ESP & PP during diagnosis and treatment.
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The Association of Ponticulus Posticus & Elongated Styloid Process with Headaches
Shivani Sharma,Rakesh Nagaraju,Shweta Sharma 대한안면통증∙구강내과학회 2018 Journal of Oral Medicine and Pain Vol.43 No.3
Purpose: The present study was designed to investigate the association of ponticulus posticus(PP) and elongated styloid process (ESP) with headaches. Methods: Analysis of head and neck cone beam computed tomography samples from the archivesof the Department of Oral Radiology was done for the presence of partial or completePP and ESP length, type, thickness, mediolateral angulation, anterioposterior angulation (horizontal& vertical), lateral or medial curvature. This was followed by personal & telephonicquestionnaires to the subjects for the evaluation of the presence of headaches & other associatedsymptoms. Results: Among 134 subjects, 62 subjects (46.3%) presented with headache and 72 subjects(53.7%) did not have any headache. On further analysing the total 62 subjects with headache,it was found out that 31 subjects (50.0%) of them had ESP and PP both, 16 subjects (25.8%)had only ESP, and 15 subjects (24.2%) had only PP. A strong association was present betweenheadache and presence of PP & ESP individually and together. Conclusions: All health care professionals dealing with the head and neck pain disordersshould also consider the presence of ESP & PP during diagnosis and treatment.
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Shweta A Singh,Kelika Prakash,Sandeep Sharma,Gaurav Dhakate,Vikram Bhatia 대한마취통증의학회 2018 Korean Journal of Anesthesiology Vol.71 No.1
Background: We evaluated whether the addition of a small dose of ketamine or fentanyl would lead to a reduction in the total dose of propofol consumed without compromising the safety and recovery of patients having endoscopic ultrasonography (EUS). Methods: A total of 210 adult patients undergoing elective EUS under sedation were included in the study. Patients were randomized into three groups. Patients were premedicated intravenously with normal saline in group 1, 50 μg fentanyl in group 2, and 0.5 mg/kg ketamine in group 3. All patients received intravenous propofol for sedation. Propofol consumption in mg/kg/h was noted. The incidence of hypotension, bradycardia, desaturation, and coughing was noted. The time to achieve a Post Anesthesia Discharge Score (PADS) of 10 was also noted. Results: There were 68 patients in group 1, 70 in group 2, and 72 in group 3. The amount of propofol consumed was significantly higher in group 1 (9.25 [7.3–13.2]) than in group 2 (8.8 [6.8–12.2]) and group 3 (7.6 [5.7–9.8]). Patient hemodynamics and oxygenation were well maintained and comparable in all groups. The time to achieve a PADS of 10 was significantly higher in group 3 compared to the other two groups. Conclusions: The use of 50 μg fentanyl or 0.5 mg/kg ketamine in a single dose during EUS reduces the dose of propofol required for sedation. However, unlike the addition of fentanyl, the addition of ketamine increased the time to recovery. Thus, 50 μg fentanyl is a good additive to propofol infusion for sedation during EUS to reduce the requirement for propofol without affecting the time to recovery.
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