Informatics Publishing Limited

D. Priyashree ¹, B. Baranidharan ¹, B. Shanthi ¹

Affiliations
1 SASTRA University, School of Computing, Thanjavur, IN

Abstract

Coverage plays a major role in energy consumption model of Wireless Sensor Networks (WSN). Energy efficient coverage of the targets becomes one of the challenging problems in WSN, because of low-energy, low processing of the nodes. In this paper target coverage had been addressed; monitoring the specific target with the set of sensors. In order to have an energy efficient coverage, it is necessary to select the node which detects target within a particular accuracy gain value. In this paper, we first randomly deployed the nodes and select the nodes which are eligible to cover the target with desired information gain value. Energy conservation is achieved through activating only the eligible nodes.

Keywords

Coverage, Energy Efficiency, Lifetime, Sensor Placement, Target Coverage

Full Text

   

G. Prem Sunder ¹, B. Shanthi ², Alamelu Nachiappan ³, S.P. Natarajan ⁴

Affiliations
1 Department of Electrical and Electronics Engineering, Mailam Engineering College, Mailam, Tindivanam − 604304, Villupuram, IN
2 Centralized Instrumentation and Service Laboratory, Annamalai University, Annamalai Nagar − 608 002, Tamil Nadu, IN
3 Department of Electrical and Electronics Engineering, Pondicherry Engineering College, Puducherry − 605 014, IN
4 Department of Instrumentation Engineering, Annamalai University, Annamalai Nagar −608001, Chidambaram, Tamil Nadu, IN

Abstract

Background/Objectives: Quasi-Z-source based multilevel inverters have attracted much interest in recent research works due to its valuable merits when evaluated with conventional voltage source inverters and Z-source Inverters. The objectives of this research work is to provide lower power rating of power devices, continuous input current, higher boosted output voltage and reduced current stress for dc source. Methods/Statistical analysis: A new quasi-Z-source Cascaded H-Bridge multilevel inverter with voltage-lift cell (VL-qZS-CHB-MLI) is analysed in this research paper. The performance of the VL-qZS-CHB-MLI is verified through simulation results obtained using multicarrier PD-PWM technique with simple boost control strategy. Shoot-through states are introduced in generated pulses by utilizing the simple boost control technique. Extended boost operation of the proposed topology is provided by the shoot-through states. Findings: In this new proposed topology, the presence of voltage-lift cell significantly strengthens the boost capability for the equal shoot-through duty ratio as in traditional qZS-CHB-MLI. The proposed topology involves lower shoot-through duty ratio as in the qZS-CHB-MLI for achieving the same boost gain. This advantage of the proposed topology makes possible the larger improvement in the output voltage. Application/Improvements: The proposed topology can be popularly utilized for high-power applications requiring good quality boosted output and low voltage stress. Also, the proposed topology offered abundant merits over traditional Cascaded H-Bridge (CHB) multilevel inverter in distributed power generation applications like PV power system and wind energy system.

Keywords

Cascaded H-Bridge (CHB) Multilevel Inverter, PD-PWM, Quasi-Z-Source, Simple Boost Control, Voltage-Lift Cell.

Full Text

   

P Satheesh Kumar ¹, S.P. Natarajan ², Alamelu Nachiappan ³, B. Shanthi ⁴

Affiliations
1 Department of Electrical and Electronics Engineering, Mailam Engineering College, Mailam, Tindivanam − 604304, Villupuram,, IN
2 Department of Instrumentation Engineering, Annamalai University, Annamalai Nagar − 608001, Chidambaram, Tamil Nadu, IN
3 Department of Electrical and Electronics Engineering, Pondicherry Engineering College,Puducherry − 605 014, IN
4 Centralized Instrumentation and Service Laboratory, Annamalai University, Annamalai Nagar − 608 002,Tamil Nadu, IN

Abstract

Background/Objectives: To overcome the restriction of step down operation in Voltage Source Inverter (VSI) and to get extra boosting ability, with same set of switches, a new topology in the family of Z source fed multilevel inverter is developed in this research article. Methods/Statistical analysis: Switched Inductor is used to develop this new topology. By Integrating switched inductor cell instead of normal inductor in Z source and cascaded multilevel inverter this topology is developed. This set up provide high boost factor than the existing Z Source Cascaded H Bridge Multi-Level Inverter (ZS CHB MLI). Findings: Maintaining constant shoot-through state and hence the boost factor is easier as shoot-through state is determined by two straight lines. For high voltage conversion ratio, this topology requires only a little duration of shoot through zero state. This increased voltage conversion ratio helps in improving the quality of the output power. Enlarged voltage adjusting ability, from low ac voltages to higher ac voltages is possible in this topology. Application/ Improvements: It has wide application in ac-dc, dc-ac, ac-ac, dc-dc, power conversion. For the applications that require low ac voltages, this topology supports as it has voltage buck inversion ability. Detailed discussion about this topology is presented.

Keywords

Cascaded Multilevel Inverter, Simple Boost Technique, Switched Inductor (SL), Z Source.

Full Text

   

V. Arun , B. Shanthi , K. Raja

Abstract

This paper represents a new topology 15 level asymmetric multilevel inverter with HYBRID PWM strategy. Multilevel inverter is triggered using hybrid PWM strategy. It includes Phase Disposition (PD) strategy, Alternate Phase Opposition Disposition (APOD) strategy and Carrier Overlapping (CO) strategy. The performance measures like Total Harmonic Distortion (THD), V_RMS (fundamental), crest factor, form factor and distortion factor are evaluated for various modulation indices. Simulation is performed using MATLAB-SIMULINK.

 

Keywords

APOD, CO, PD, PWM

Full Text

   

N. Prabaharan , V. Arun , B. Shanthi

Abstract

This paper focuses a new topology of an asymmetrical seven level inverter with binary DC sources. Multilevel inverter is triggered by using Unipolar Multicarrier Pulse Width Modulation (UMCPWM) method, sine and trapezoidal references with triangular carriers; it includes Phase Disposition (PD) method, Alternate Phase Opposition Disposition (APOD) method, Carrier Overlapping (CO) method and Variable Frequency (VF) method. The Performances measure like, Total Harmonic Distortion (THD), Fundamental V_RMS Crest Factor (CF), Form Factor (FF) and Distortion Factor (DF) are evaluated for various modulation indices. Simulation is carried out by using MATLAB-SIMUINK. It is observed that UMCVFPWM method provides lower THD, UMCCOPWM method provides higher fundamental V_RMS output voltage, and UMCAPODPWM method provides lower Distortion Factor.

Keywords

APOD, CO, PD, PWM, UMCPWM, VF

Full Text

   

Jyothi Elizabeth Roy ¹, B. Shanthi ², V. S. Kalaiselvi ³

Affiliations
1 Post Graduate, Department of Biochemistry, Sree Balaji Medical College and Hospital, Bharath Institute of Higher Education and Research, Chennai, IN
2 Professor and HOD, Department of Biochemistry, Sree Balaji Medical College and Hospital, Bharath Institute of Higher Education and Research, Chennai, IN
3 Professor, Department of Biochemistry, Sree Balaji Medical College and Hospital, Bharath Institute of Higher Education and Research, Chennai, IN

Abstract

Background: In CKD, there is a dynamic and tenacious loss of renal capacity which at last leads on to end organize renal malady (ESRD). Sickliness is a typical confusion of CKD and creates before ESRD. Hepcidin is known to be the focal controller of iron homeostasis in the body. It is up-controlled by aggravation and downregulated by iron deficiency. Past work has demonstrated that serum hepcidin levels were expanded in patients with CKD. Comprehension of hepcidin hormone and its job in iron digestion could prompt new treatments for CKD-related frailty. It is conceivable that expanded hepcidin fixations may cause ironconfined erythropoiesis additionally in CKD-related pallor.

Aim and Objectives: The aim of the study is to estimate the levels of hepcidin in CKD patients and to check the correlation of hepcidin to anemia in chronic kidney disease.

Method: This cross-sectional investigation was led at the Department of Biochemistry, Central Laboratory, Sree Balaji Medical College and Hospital, Chromepet, Chennai during January 2017 - June 2018 among 50 patients of incessant kidney sickness in the age gathering of 18-60 years. The blood tests were gathered utilizing vacutainer framework. Tests for serum hepcidin, urea and creatinine were gathered in red bested plain vacuum tube. The examples were centrifuged at 3000 rpm for 15 minutes. The examples were then prepared, and qualities were gotten. The information were examined utilizing SPSS bundle.

Results: The mean values of s. Hepcidin and s. ferritin were found to be increased in the study population. The mean values of s. Iron, s. TIBC, s. Transferrin levels and hemoglobin were lower in the study population.

Conclusion: Hepcidin levels are elevated in CKD and hepcidin is a predictor of iron stores since it correlated well with the markers of iron status, serum iron and ferritin levels.

Keywords

Chronic Kidney Disease (CKD), Hepcidin.

Full Text

     

Jyothi Elizabeth Roy ¹, B. Shanthi ², V. S. Kalaiselvi ³

Affiliations
1 Post Graduate, Department of Biochemistry, Sree Balaji Medical College an Hospital, Bharath Institute of Higher Education and Research, Chennai, IN
2 Professor and HOD, Department of Biochemistry, Sree Balaji Medical College an Hospital, Bharath Institute of Higher Education and Research, Chennai, IN
3 Professor, Department of Biochemistry, Sree Balaji Medical College an Hospital, Bharath Institute of Higher Education and Research, Chennai, IN

Abstract

Background: In CKD, the dynamic and tenacious loss of renal capacity which eventually leads on to end arrange renal malady (ESRD). Iron deficiency is a typical entanglement of CKD and creates before ESRD. Hepcidinis considered as the headliner of iron homeostasis in the body. It is up-managed by aggravation and downregulated by pallor. Past work has demonstrated that serum hepcidin levels were expanded in patients with CKD. This was astounding as these patients had a constant incendiary state and concurrent iron deficiency. It is conceivable that expanded hepcidin focuses may cause iron-confined erythropoiesis likewise in CKD-related weakness.

Aim and Objectives: The aim of the study is to estimate the levels of serum hepcidin in patients with chronic kidney disease.

Methods: This cross-sectional examination was directed at the Department of Biochemistry, Central Laboratory, Sree Balaji Medical College and Hospital, Chromepet, Chennai during January 2017 - June 2018 among 50 patients of incessant kidney illness in the age gathering of 18-60 years. The blood tests were gathered utilizing vacutainer framework. Tests for serum hepcidin, urea and creatinine were gathered in red bested plain vacuum tube. The examples were centrifuged at 3000 rpm for 15 minutes. The examples were then processed,and qualities were gotten. The information were investigated utilizing SPSS bundle.

Results: In CKD patients, serum hepcidin levels are found to be elevated and found to be positively correlating with serum urea and creatinine values.

Conclusion: Serum hepcidin levels are elevated in CKD patients which could be responsible for the iron restricted erythropoiesis and resistance to erythropoietin stimulating agents in CKD.

Keywords

Chronic Kidney Disease (CKD), Hepcidin.

Full Text