A VLSI DSP DESIGN AND IMPLEMENTATION OF COMB FILTER USING UN-FOLDING METHODOLOGY

In signal processing, a comb filter adds a delayed version of a signal to itself, causing constructive and destructive interference. Comb filters are used in a variety of signal processing applications that is Cascaded Integrator-Comb filters, Audio effects, including echo, flanging, and digital waveguide synthesis and various other applications. Comb filter when implemented has lower through-put as the sample period can not be achieved equal to the iteration bound because node computation time of comb filter is larger than the iteration bound. Hence throughput remains less. This paper present the comb filter using one of the methodology needed to design custom or semi custom VLSI circuits named as Un-Folding which increases the throughput of the comb filter. Un-Folding is a transformation technique that can be applied to a DSP program to create a new program describing more than one iteration of the original program. It can unravel hidden con-currency in digital signal processing systems described by DFGs. Therefore, unfolding has been used for the sample period reduction of the comb filter for its higher throughput

A VLSI DSP DESIGN AND IMPLEMENTATION OF ALL POLE LATTICE FILTER USING RETIMING METHODOLOGY

All pole lattice fil ters are used in a variety of signal processing applications that is speech processing, adaptive filters and various other applications. The implementation of lattice f i l t e r requires more clock period hence low speed. There are various transformation technique pr es ent for design of high-speed or low-area or lowpower implementations. This paper presents design of high-speed (smaller clock period) implementation of 8th order all pole lattice filter using the methodology named as Retiming. Retiming reduces the clock period of the circuit, reducing the number of registers in the circuit, reducing the power consumption of the circuit. Therefore, retiming has been used to reduce the clock period of all pole lattice filters and it increases the speed of the system

Ultra low power adiabatic logic using diode connected DC biased PFAL logic

With the continuous scaling down of technology in the field of integrated circuit design, low power dissipation has become one of the primary focuses of the research. With the increasing demand for low power devices, adiabatic logic gates prove to be an effective solution. This paper briefs on different adiabatic logic families such as ECRL (Efficient Charge Recovery Logic), 2N-2N2P and PFAL (Positive Feedback Adiabatic Logic), and presents a new proposed circuit based on the PFAL logic circuit. The aim of this paper is to simulate various logic gates using PFAL logic circuits and with the proposed logic circuit, and hence to compare the effectiveness in terms of average power dissipation and delay at different frequencies. This paper further presents implementation of C17 and C432 benchmark circuits, using the proposed logic circuit and the conventional PFAL logic circuit to compare effectiveness of the proposed logic circuit in terms of average power dissipation at different frequencies. All simulations are carried out by using HSPICE Simulator at 65 nm technology at different frequency ranges. Finally, average power dissipation characteristics are plotted with the help of graphs, and comparisons are made between PFAL logic family and new proposed PFAL logic family

Successor features based multi-agent RL for event-based decentralized MDPs

Decentralized MDPs (Dec-MDPs) provide a rigorous framework for collaborative multi-agent sequential decisionmaking under uncertainty. However, their computational complexity limits the practical impact. To address this, we focus on a class of Dec-MDPs consisting of independent collaborating agents that are tied together through a global reward function that depends upon their entire histories of states and actions to accomplish joint tasks. To overcome scalability barrier, our main contributions are: (a) We propose a new actor-critic based Reinforcement Learning (RL) approach for event-based Dec-MDPs using successor features (SF) which is a value function representation that decouples the dynamics of the environment from the rewards; (b) We then present Dec-ESR (Decentralized Event based Successor Representation) which generalizes learning for event-based Dec-MDPs using SF within an end-to-end deep RL framework; (c) We also show that Dec-ESR allows useful transfer of information on related but different tasks, hence bootstraps the learning for faster convergence on new tasks; (d) For validation purposes, we test our approach on a large multi-agent coverage problem which models schedule coordination of agents in a real urban subway network and achieves better quality solutions than previous best approaches

Reinforcement learning for zone based multiagent pathfinding under uncertainty

Ministry of Education, Singapore under its Academic Research Funding Tier

Outcome of Traumatic bilateral basal ganglia Hemorrhage: Rarest entity: Prospective study of five cases: Single institutional Experience

Traumatic Basal ganglia hemorrhage is rare entity but bilateral basal ganglia hematoma after trauma is extremely rare and is limited to case reports. We describe five cases of traumatic bilateral basal ganglia hemorrhage, and its outcome and management. All Cases were managed conservatively. The general incidence of TBGH is reported between 2.4-3% of closed head injury. However, the incidence is higher in post mortem studies (9.8%). Five consecutive patients of TBGH, shown in initial Noncontrast CT (NCCT) head, admitted in our institute from August 2013 to August 2016, during this period total patient admitted of head injury is 1061 so incidence of Traumatic bilateral basal ganglia Hemorrhage in our series is 0.47% which is very less compare to previous literature formed the prospective study group. There were 3 males and 2 females; age ranging from 20 to 45 years (average 30 years).Hypertensive patients, drugs abuse history, history of coagulopathy with doubtful history of trauma or unknown mode of injury was excluded from the study. All patients had sustained road traffic accidents. NCCT head done of all patients after initial resuscitation. GCS at admission were 9 to 12 (mean 10.4), Outcome assessed by Glasgow outcome Score. All patients outcome was good. Average follow up 8.54 months

Paediatric traumatic brain injury: Study of analysis of outcome predictors

Introduction. Traumatic brain injury is a leading cause of death and disability among children, adolescents. Therefore, analysing outcome predictors and initiating preventive policies may contribute to decreased incidence and better prognosis. Aim. Aim to describe the epidemiologic characteristics, mechanism of injury, radiological findings and also to analyse the determinants of outcome that could help to provide better critical care and also to establish effective preventive policies. Material and Methods. We conducted a prospective study including patients ?18 years admitted to our Neuro-intensive care unit at R.N.T. Medical College ,Udaipur, Rajasthan, India from September 2016 to June 2018.Factors including age, gender ,mode of injury, Glasgow coma score(GCS) at admission ,pupillary size-reaction, radiological findings and their relation to outcome was assessed .Patients were divided into mild, moderate and severe head injury according to GCS. Outcome of patients was assessed by Glasgow outcome scale. For statical Analysis used Chisquare test. Statistical Analysis was carried out using Stata 11.0(College station, Texas, USA) Results. The study comprised of 84 paediatric patients. 44.4%of patients were within 1–5-year age group. The most common cause for trauma was falls and traffic accidents. Patients with mild, moderate and severe head injury were 38.1%, 47.6%and 14.3% respectively. Poor outcome predictors included severity of head injury, pupil size and reaction, midline shift on CT. Conclusion. This study emphasizes increased burden of paediatric brain injury with assessment of predicting factors for more effective critical care of patients and emerging need for effective fall and traffic accidents prevention strategies

Ultra low power high speed domino logic circuit by using FinFET technology

Scaling of the MOSFET face greater challenge by extreme power density due to leakage current in ultra deep sub-micron (UDSM) technology. To overcome from this situation double gate device like FinFET is used which has excellent control over the thin silicon fins with two electrically coupled gate, which mitigate shorter channel effect and exponentially reduces the leakage current. In this research paper utilize the property of FinFET in domino logic, for high speed operation and reduction of power consumption in wide fan-in OR gate. Proposed circuit is simulated in FinFET technology by BISM4 model using HSPICE at 32nm process technology at 250C with CL=1pF at 100MHz frequency. For 8 and 16 input OR gate we save average power 11.5%,11.39% in SFLD, 22.97%, 18.12% in HSD, 30.90%, 34.57% in CKD in SG mode and for LP mode 11.26%, 15.78% in SFLD, 19.74%, 17.94% in HSD, 45.23%, 34.69% in CKD respectivel

Clinical spectrum of paediatric head injury: A prospective study from tribal region

Introduction: Traumatic Brain injury is considered as a major health problem which causes frequent deaths and disabilities in paediatric population with special concern to tribal regions of developing countries like India where etiology of traumatic brain injury in the paediatric population fall from height dominant over the road traffic accident as a major. Aim and objective: The aim is to analyse the epidemiology, mechanism, clinical presentation, severity and outcome of paediatric head injury in the tribal region of northern India that could help to make preventive policies to improve their care. Material methods: It is a prospective observational study of 345 children of up to 18 years of age admitted under Department of Neurosurgery from October 2017 to April 2019. Results: The study population comprised of 345 paediatric patients. Mean age was 9.25 years.36.81% patients were in 1-6-year age group and male to female ratio was 2.45. The most common cause for trauma was fall from height in 179(52%) cases followed by RTA in 141(41%) cases. The most common radiological finding was depressed skull fractures in 97(50%) cases. There was 35% mortality in severe head injury patients. Conclusion: This study through some light on the different scenario of head injury in Tribal regions of Developing country and will help to formulate effective strategies for prevention and better care of the patients