Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

Bit error rate testing scheme for digital communication devices

Abstract: In the present era, digital transmission of data plays a vital role in every sector. The main aim of this paper is to design a cost effective device which can test a transmission data and find the errors if any at the receiving end. Products based on this concept, having customizable options are widely available but with high cost. Most of the options in the testing equipment are unused, so there has been a requirement of a customized IP based tester with V.35 and PCM E1 framer which can serve in testing MODEMS. The 32 bit microcontroller STM32 monitors all the blocks on the testing board. The peripherals are connected to STM32 using various interfaces. The pattern generated is modulated on the transmission side of E1 framer or V.35. The MODEM receives the pattern and loops back it to the receiver section of E1 framer or V.35. Here the pattern is recovered via demodulator and passed to the BERT (Bit Error Rate Tester). If both are same then there will be no Bit Error, otherwise status register and bit error register values get updated automatically indicating the possibility of the error. The number of patterns generated by BERT is 23 and can be connected with multiple modems to test their working corresponding to different patterns. This process ensures the communication between MODEMS and BERT in a safest mode.

Automatic Accident Rescue System Using IoT

Abstract: Nowadays, the road accidents in modern urban areas are increased to uncertain level. In highly populated countries like India, more than 410 people get swooped up every day. A leading cause of the global burden of public health and fatalities is road accidents. The loss of human life due to accident is to be avoided. There is no technology in current times for detection of accident. Reaching of ambulance to the accident location is mostly delayed due to the conjested traffic that increases the chance of victim death. To reduce loss of life or save life of person due to accidents and reduce the time taken by ambulance to reach the hospital, there is a need of system which needs to come into force in our daily lives. To bar loss of human life due to accidents, we introduce a scheme called automatic accident rescue system (AARS). There is an automatic detection of accident by crash sensors in the vehicle. A GPS module in the vehicle will send the location coordinates of the accident using IoT platform to central unit which will notify and send an ambulance from the nearest hospital in the vicinity to the accident spot. This scheme is fully automated; thus, it finds the accident spot, helping to reach the hospital in time. This system can help in reducing the loss of lives of human which happen by the accident.

Energy-efficient approximate adders for DSP applications

Abstract: In this paper, approximate adders were proposed for DSP processors. DSP processors are mainly composed of adders and multipliers at bottom level. The power is minimized in transistor level design. Proposed adders have less power dissipation when compared to existing approximate adders. Results have shown that the proposed adders have less PDP with more accuracy. The circuits were simulated in Cadence virtuoso tool under 45 nm CMOS technology. Supply voltage is + 0.5 V.

Performance Study of LaPO4-Y2O3 Composite Fabricated by Sol-Gel Process Using Abrasive Waterjet Machining

Abstract: This chapter presents an effective approach to assess the abrasive water jet machining of lanthanum phosphate reinforced with yttrium composite. A novel composite is prepared with the mixture of lanthanum phosphate sol and yttrium nitrate hexalate with a ratio of 80/20 by aqueous sol-gel process. Silicon carbide of 80 mesh size is used as abrasive. The effects of each input parameter of abrasive water jet machining are studied with an objective to improve the material removal rate with reduced kerf angle and surface roughness. The observations show that the jet pressure contributes by 77.6% and 45.15% in determining material removal rate and kerf angle, respectively. Through analysis of variance, an equal contribution of jet pressure (38.18%) and traverse speed (40.97%) on surface roughness is recorded. Microscopic examination shows the internal stress developed by silicon carbide which tends to get plastic deformation over the cut surface.

Astaxanthin production and technology in Vietnam and other Asian countries

Abstract: Astaxanthin (3,3′-dihydroxy-β,β-carotene-4,4-dione) is a known to be valuable carotenoid with strong antioxidant, which has been extensively used in various industries (such as aquaculture, nutraceutical, pharmaceutical, and food). There have been two major sources of astaxanthin: chemical (synthetic) and biological (natural) source. In nature, astaxanthin can be synthesized by plants, crustaceans by-product, bacteria, a few fungi, and green algae, in which microalga Haematococcus pluvialis is an appropriate source of natural astaxanthin exploitation that seems to be gaining potential in the market. Technology for natural astaxanthin production is an expensive process, depending on each producer, in each country. Therefore, continuous efforts were necessary to improve the different culture systems (photobioreactor (PBR) and open pond), culture models (heterotrophic and photoautotrophic), culture methods, harvesting, and astaxanthin extraction processes for enhanced production of astaxanthin-rich biomass and cost reduction in large-scale culture. In this chapter, we summarized about astaxanthin production and technology for its production in Vietnam and other Asian countries to get a more general view of this valuable product.