Low Power Reconfiguration of Approximate Arithmetic Units Using Verilog HDL

Nithin Nagabasavanna,Nagaraju Chowdaiah 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.9

Approximate computing is the theme that a system can let applications trade off accuracy for efficiency. It involves any technique where the system intentionally let on incorrectness to the application layer in order for conserving some resource. Floating point numbers i.e. approximate real number arithmetic to save space and time over arbitrary precession numerical representation. Approximate (APP) Computing is a technique of computation which ripostes less accuracy in results instead of an accurate output, which is enough for the desired application. The proposed work gives the basic allies on approximate computing based on arithmetic units using Verilog HDL. In dual mode operation, full adders and its types of adders resemble minimizing the power consumption and overall delay. Results show the great power saving efficiency and the 37mV and overall delay of 15.519ns.

A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

Nithin Raj,Jagadanand G,Saly George 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.

A Modified Charge Balancing Scheme for Cascaded H-Bridge Multilevel Inverter

Raj, Nithin,G, Jagadanand,George, Saly The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.6

Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.

Three-dimensional cone-beam computed tomographic sialography in the diagnosis and management of primary Sjögren syndrome: Report of 3 cases

Thomas, Nithin,Kaur, Aninditya,Reddy, Sujatha S.,Nagaraju, Rakesh,Nagi, Ravleen,Shankar, Vidya Gurram Korean Academy of Oral and Maxillofacial Radiology 2021 Imaging Science in Dentistry Vol.51 No.2

Sjögren syndrome is a chronic autoimmune inflammatory disease characterized by lymphocytic infiltration of exocrine glands, predominantly the parotid and lacrimal glands, thereby resulting in oral and ocular dryness. It has been reported to occur most frequently in women between 40 and 50 years of age. Sjögren syndrome has an insidious onset, is slowly progressive, and presents a wide range of clinical manifestations, leading to delays or challenges in the diagnosis. Early diagnosis of this condition is essential to prevent the associated complications that affect patients' quality of life. This report presents 3 cases of Sjögren syndrome in female patients aged between 40 and 75 years who presented with complaints of persistent dry mouth and burning sensation. The cases highlight the diagnostic value of 3-dimensional cone-beam computed tomographic sialography in the detection of salivary gland pathologies at an early stage.

A Short Preamble-Based Synchronization for QPSK/TDMA Satellite Receiver - Implementation on Multi-core DSP

Dileep K G,Pradeep Goutam,Laxmaiah P,Nithin Kumar S,Hari Prasad S V,Nithin B 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1

This paper demonstrates the implementation of a QPSK/Time Division Multiple Access (TDMA) satellite receiver using short preamble-based synchronization in the presence of timing, frequency and phase offsets, and with Additive White Gaussian Noise (AWGN). The detection and estimation of synchronization parameters of the received signal, i.e., frequency, phase and symbol timing, are highly dependent on the preamble of the burst. Moreover, computational complexity and acquisition time of the receiver are directly proportional to the preamble length. The implemented receiver uses a 64-bit short preamble for synchronization and gives better bit error rate (BER) performance at low signal to noise ratio (SNR), close to -3dB. The functional verification of the synchronization algorithm is done using Matlab simulations and the algorithm implementation uses fixed-point C. The receiver design has been prototyped for 4 TDMA channels in Texas Instruments (TI) multi-core C66x DSP. The design and implementation of this receiver have been done for C-DOT indigenous satellite project.

Single-insertion technique for anesthetizing the inferior alveolar nerve, lingual nerve, and long buccal nerve for extraction of mandibular first and second molars: a prospective study

Benny Joseph,Nithin Kumar,Suresh Vyloppilli,Shermil Sayd,KP Manojkumar,Depesh Vijaykumar 대한구강악안면외과학회 2020 대한구강악안면외과학회지 Vol.46 No.6

Objectives: Appropriate and accurate local anesthetic (LA) techniques are indispensable in the field of oral and maxillofacial surgery to obtain a satisfactory outcome for both the operating surgeon and the patient. When used alone, the inferior alveolar nerve block (IANB) technique requires supplemental injections like long buccal nerve block for extraction of mandibular molars leading to multiple traumatic experiences for the patient. The aim of this study was to anesthetize the inferior alveolar, lingual, and long buccal nerves with single-needle penetration requiring a minimal skillset such as administering a conventional IANB through introduction of the Benny Joseph technique for extraction of mandibular molars. Materials and Methods: This was a prospective study conducted in the Department of Oral and Maxillofacial Surgery, Kunhitharuvai Memorial Charitable Trust (KMCT) Dental College, Calicut, India. The duration of the study was 6 months, from June to November 2017, with a maximum sample size of 616 cases. The LA solution was 2% lignocaine with 1:100,000 adrenaline. The patients were selected from a population in the range of 20 to 40 years of age who reported to the outpatient department for routine dental extraction of normally positioned mandibular right or left first or second molars. Results: Of the 616 patients, 42 patients (6.8%) required re-anesthetization, a success rate of 93.2%. There were no complications such as hematoma formation, trismus, positive aspiration, and nerve injuries. None of the cases required re-anesthetization in the perioperative period. Conclusion: The Benny Joseph technique can be employed and is effective compared with conventional IANB techniques by reducing trauma to the patient and also requires less technique sensitivity.

Prediction of Compressive Strength of Self-Compacting Concrete using Least Square Support Vector Machine and Relevance Vector Machine

Bhairevi Ganesh Aiyer,김두기,Nithin Karingattikka,Pijush Samui,P. Ramamohan Rao 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.6

This article examines the capability of Least Square Support Vector Machine (LSSVM) and Relevance Vector Machine (RVM) fordetermination of compressive strength (fc) of self compacting concrete. The input variables of LSSVM and RVM are Cement (kg/m3)(C),Fly ash (kg/m3)(F), Water/powder (w/p), Superplasticizer dosage (%)(SP) Sand (kg/m3)(S) and Coarse Aggregate (kg/m3)(CA). Theoutput of LSSVM and RVM is fc. The developed LSSVM and RVM give equations for prediction of fc. A comparative study has beendone between the developed LSSVM, RVM and ANN models. Experiments have been conducted to verify the developed RVM andLSSVM. The developed RVM gives variance of the predicted fc. The results confirm that the developed RVM is a robust model forprediction of fc of self compacting concrete.

Experimental investigation of dynamic trim control devices in fast speed vessel

Kwang-Cheol Seo,Nithin Gopakumar,Mehmet Atlar 한국항해항만학회 2013 한국항해항만학회지 Vol.37 No.2

The displacement Deep-V catamaran concept was developed in Newcastle University(UNEW) through development of the systematic Deep-V catamaran series. One of the most important Deep-V catamaran launched to date is Newcastle University’s own multi-purpose research vessel, The Princess Royal. The vessel was launched in 2011 and enhanced the Deep-V catamaran concept further with the successful adoption of a novel anti-slamming bulbous bow and tunnel stern for improved efficiency. It was however identified that the vessel has substantial amount of dynamic trim that limited the visibility of the captain. The dynamic trim also increased the wave-making resistance thereby preventing the vessel from attaining its maximum speed in certain sea states. This paper therefore presents the application of devices such as Trim Tabs, Interceptors, Transom Wedges and Integrated Transom Wedges-Tabs to control the dynamic trim and improvement of fuel efficiency of the vessel. All of these energy saving devices were fitted into a model for tests in Newcastle University’s Towing Tank. Model test verification confirmed that the optimum appendage was the interceptors, they produced a 5 % power saving and 1.2 degree trim reduction at 15 knots, and investigations of full scale trials will be scheduled with and without application of device to compare the improvement of performance.

Experimental investigation of dynamic trim control devices in fast speed vessel

Seo, Kwang-Cheol,Gopakumar, Nithin,Atlar, Mehmet Korean Institute of Navigation and Port Research 2013 한국항해항만학회지 Vol.37 No.2

The displacement Deep-V catamaran concept was developed in Newcastle University(UNEW) through development of the systematic Deep-V catamaran series. One of the most important Deep-V catamaran launched to date is Newcastle University's own multi-purpose research vessel, The Princess Royal. The vessel was launched in 2011 and enhanced the Deep-V catamaran concept further with the successful adoption of a novel anti-slamming bulbous bow and tunnel stern for improved efficiency. It was however identified that the vessel has substantial amount of dynamic trim that limited the visibility of the captain. The dynamic trim also increased the wave-making resistance thereby preventing the vessel from attaining its maximum speed in certain sea states. This paper therefore presents the application of devices such as Trim Tabs, Interceptors, Transom Wedges and Integrated Transom Wedges-Tabs to control the dynamic trim and improvement of fuel efficiency of the vessel. All of these energy saving devices were fitted into a model for tests in Newcastle University's Towing Tank. Model test verification confirmed that the optimum appendage was the interceptors, they produced a 5% power saving and 1.2 degree trim reduction at 15 knots, and investigations of full scale trials will be scheduled with and without application of device to compare the improvement of performance.

Design and Performance Evaluation of 1.2 kV, 325 A SiC-MOSFET High Performance Module based 100 kVA Three-phase Two-level Power Block

Sayan Acharya,Anup Anurag,Nithin Kolli,Subhashish Bhattacharya 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

To ramp up the adaptation of the highly optimized high current 1.2 kV Sillicon Carbide (SiC) based Metal Oxide Semiconductor Field Effect Transistor (MOSFET) power modules, a high power three-phase two-level power block is designed which is rated at 100 kVA and operates with 800 V DC bus. The power modules combined with low inductance busbar and optimized loop thermo-syphon based heatsink extracts the full performance of the power electronic switches. In this paper, the design details of the power block is presented. Furthermore, the performance of the power block is qualified by a back-to-back pump back test set up where two power blocks are interconnected via inductors. Furthermore, closed loop voltage and current control are implemented to circulate the desired amount of AC current between the power blocks. Moreover, heat run tests are carried out to quantify the thermal performance of the thermal management system. The experimental results demonstrate the performance benefits of the power block.