Distribution Grid Voltage Regulation for Power Quality Improvement Using UPQC

Poor voltage regulation is experienced for the costumers connected at the end of low voltage distribution grid. In the proposed paper, voltage regulation is achieved in the distribution grid using Unified Power Quality Compensator (UPQC). Different control techniques are used for shunt inverter in UPQC to improve the power quality of the Distribution Grid. Control techniques, including the PI control, DQ control and Minimum Power Point Tracking (mPPT) for voltage control are analyzed and simulated in the proposed paper. Simulation with UPQC is done for three different control techniques and its performances are compared. The mPPT avoids the circulation of unnecessary reactive compensation for voltage regulation by operating at the Minimum Power Point (mPP). Comparative analysis is made for UPQC with the different control techniques during sag, swell and fault condition. The simulation of distribution Grid for voltage regulation using UPQC is carried out using MATLAB Simulink

Revisiting the Fourier transform on the Heisenberg group

A recent theorem of S. Alesker, S. Artstein-Avidan and V. Milman characterises the Fourier transform on Rn as essentially the only transform on the space of tempered distributions which interchanges convolutions and pointwise products. In this note we study the image of the Schwartz space on the Heisenberg group under the Fourier transform and obtain a similar characterisation for the Fourier transform on the Heisenberg group

Problems in Public Distribution System

To minimize the poverty level among general public, Government of India promoted Public distribution system for extending basic necessary goods at subsidized rates. But their primary motto has not been fulfilled due to numerous problems prevailing in PDS. Thus, an attempt has been made in this study to ascertain the Problems prevailing in PDS. The result of the study indicates that Adulteration, Distribution of inferior quality goods, Under Weighment are the common problems found in Public distribution system

A comparative study of intravenous dexmedetomidine and midazolam on prolongation of spinal anesthesia

Background: The present study was conducted to compare the efficacy and safety of intravenous dexmedetomidine and midazolam on prolongation of spinal anesthesia.Methods: The study population included people who were undergoing for spinal anesthesia for various surgeries. A total of 90 subject were randomized equally to Dexmedetomidine, Midazolam and saline groups using a computer generated random number sequence. Three study groups were compared with respect to all the baseline variables. The key outcome parameters and hemodynamic parameters were compared among the three study groups.Results: No statistically significant differences were observed in baseline paramters across study groups. The median values of patient satisfaction score and anesthesiologist satisfaction score were almost equal among three study groups, but the association was statistically not significant. The median VAS and the median HSL were slightly lower in dexmedetomidine group than other two groups (VAS-1,2,3 respectively and HSL -4,6,6 respectively) with statistically significant association (P0.05) except with number of patients requiring analgesic for the first 24 hours (P value<0.05).Conclusions: Measurement of patient and anesthesiologist satisfaction scores are more or less similar in midazolam and dexmedetomidine groups compare to saline group

Privacy Preserving Physical Layer Authentication Scheme for LBS based Wireless Networks

With the fast development in services related to localisation, location-based service (LBS) gains more importance amongst all the mobile wireless services. To avail the service in the LBS system, information about the location and identity of the user has to be provided to the service provider. The service provider authenticates the user based on their identity and location before providing services. In general, sharing location information and preserving the user’s privacy is a highly challenging task in conventional authentication techniques. To resolve these challenges in authenticating the users, retaining users’ privacy, a new SVD (singular value decomposition) based Privacy Preserved Location Authentication Scheme (SPPLAS) has been proposed. In this proposed method, physical layer signatures such as channel state information (CSI) and carrier frequency offset (CFO) are used for generating secret key required for encrypting the user’s location and identity information, and thus encrypted user’s information is sent to service provider for authentication. Secret key is generated by applying SVD on CSI vector. The proposed scheme aids in authenticating the user through location information while protecting the user’s privacy. The performance of the proposed method is evaluated in terms of bit mismatch, leakage and bit error rate performance of receiver and adversary. The simulation results show that the proposed scheme achieves better robustness and security than the existing location-based authentication techniques

Effect of Antioxidants like α-Tocopherol and Ascorbic Acid in arresting the progression of Diabetic Retinopathy and ascertain the Morphological changes in the Red blood cells as Oxidative Stress marker: A Randomized, Open Label, Comparative Pilot Study

INTRODUCTION : Diabetic retinopathy, a debilitating microvascular complication of Diabetes, is the leading cause of acquired blindness. Oxidative stress, a cytopathic consequence of imbalance between the production and removal of free radicals is implicated in the pathogenesis of Diabetic retinopathy. Oxidative stress induced Haemolytic anaemia, vasospasm and chronic inflammation causes retinal ischaemia and progression of Diabetic retinopathy. Antioxidants like α-Tocopherol (Vitamin E) and Ascorbic acid (Vitamin C) scavenges free radicals and prevents the progression of retinopathy and also normalises the crenated red blood cells(RBCs). AIMS AND METHODOLOGY: This study aims to assess the effect of Vitamin E & C in arresting the progression of Diabetic retinopathy and correction of haemolytic anaemia using RBC morphology as biomarker of Oxidative stress. This study is an interventional, randomized, open label study conducted on 60 adult patients diagnosed as Non-proliferative diabetic retinopathy(NPDR) at Regional Institute Government Ophthalmic Hospital, Egmore. They were divided into two groups with 30 in each group. Control group received antidiabetic treatment only whereas study group received T.Vitamin C 500mg once daily and C. Vitamin E400mg twice daily for 12 weeks per patient. They were reviewed every 4 weeks for lab investigation, RBC morphology and Ophthalmic examination. They were followed up for a post-treatment period of 4 weeks. The obtained data were analysed using SPSS vs 21. RESULTS: There was a statistically significant reduction in the fasting blood glucose levels at the end of 12 weeks between two groups (p<0.001). There was also significant reduction in the number of patients with very severe and severe NPDR (p=0.001). 20% of study population showed improvement in visual acuity in contrast to 3.33% of control group at the end of the study. The mean percentage of crenated RBCs with Heinz bodies reduced significantly from 80.40% to 7.20% in study group compared to 82.57% to 82.33% in control group at the end of 12 weeks. CONCLUSION: Oxidative stress plays a vital role in the development of Diabetes and its complications like retinopathy. In this study, supplementation of antioxidants like Vitamin C & E showed that there was arrest in the progression of Diabetic retinopathy and there was also a significant improvement in visual acuity in the study group at the end of 12 weeks. Free radicals induced hyperglycaemia and crenated RBCs were also normalised after antioxidants intake in the study group. This proved the hypothesis that free radicals are responsible for Diabetic retinopathy and antioxidants like Vitamin E & C acts as disease modifying agents and improves quality of life in Type II diabetic patients

A Clinicopathological Study of Ovarian Tumors and The Role of Immunohistochemical Proliferative Marker Ki 67.

Like The Everyform Of Cancer, Early Detection Is What All About.. It Can Be Prevented With Testing And It Can Be Beaten If Caught Early! -Rod Stewart The Ovarian Tumors Are Not A Single Entity, But A Complex Wide Spectrum Of Neoplasms Involving A Variety Of Histological Tissues, Ranging From Epithelial Tissues, Connective Tissues, Specialized Hormone Secreting Cells To Germinal And Embryonal Cells.40 The Ovary Is Complex In Its Embryology, Histology, Steroidogenesis And Has Potential To Develop Malignancy40. Of All The Gynecologic Cancers, The Ovarian Malignancies Represent The Greatest Challenge Because The Ovary Gives Rise To Greater And Larger Variety Of Tumors Than Any Other Organ.A Female’s Risk At Birth Of Having Ovarian Tumor Sometime In Her Life Is 6- 7%,Of Having Ovarian Cancer Is Almost 1.5% And Dying From Ovarian Cancer Is 1%49 The Incidence Of Ovarian Cancer Ranks Below Only To The Carcinoma Of Cervix.The Ovarian Tumors Constitute About 5% Of Gynaecological Admissions. About 75% Of Them Are Benign And 25% Are Malignant. In India, Ovarian Tumors Account For 8% Of All Gynecological Malignancies43 Different Tumors Tend To Involve Different Age Groups.They Occur In Perimenopausal And Postmenopausal Women, Infrequently In Children Also. The Risk Of Developing Ovarian Tumor Peaks In The Fifth Decade Of Life88. The Ovarian Tumors Pose A Special Diagnostic And Management Problem In The Postmenopausal Women Because Of Their Late Presentation , High Risk Of Malignancy And Poor Prognostic Outcome And In Children Pose A Great Challenge To The Clinicians Owing To The Need Of Conservation Of Reproductive, Endocrinal And Menstrual Function On One Hand And Malignant Potential On The Other. Apart From Primary Tumors, Ovaries Are Frequent Site For Metastatic Involvement From Organs Like Stomach, Colon And Breast Signs And Symptoms Of Ovarian Cancer Are Frequently Absent Or Subtle Early On , Or Persist For Several Months Before Being Recognized And Diagnosed. More Than 50% Of Patients Are Diagnosed In The Advanced Stage Of The Disease. This Study Is Undertaken To Analyze The Histopathological Spectrum And Clinical Features And To Emphasize The Importance Of Immunohistochemical Markers In Accurate Diagnosis And To Investigate The Biological Significance Of Ki 67 Antigen Expression In Benign, Borderline And Malignant Ovarian Tumors