Dr Debmalya Bhattacharya | Pune University, MIT Academy of Engineering (original) (raw)

Papers by Dr Debmalya Bhattacharya

This paper proposes a technique of GPS/GPRS module inbuilt in a watch. In everyday life women are... more This paper proposes a technique of GPS/GPRS module inbuilt in a watch. In everyday life women are unsafe to go out of their residence. In order to provide some safety measure, we have design a watch which will work as a GPS/GPRS locator, which will find the positioning of the person. The transmission of the signals take place by a GSM module and the image processed by the camera lens are being sent for the recipient. The functioning of the complete system will save a victim under any circumstances. The practical examination of the system is done by 4*4cm GPS/GPRS module and micro SIM slot at the back side of the watch, entire system works with common powered battery.

This paper represents low power and high speed 128-point pipelined Fast Fourier Transform (FFT) a... more This paper represents low power and high speed 128-point pipelined Fast Fourier Transform (FFT) and its inverse Fast Fourier Transform (IFFT) processor for OFDM. The Modified architecture also provides concept of ROM module and variable length support from 128~2048 point for FFT/IFFT for OFDM applications such as digital audio broadcasting (DAB), digital video broadcasting-terrestrial (DVB-T), asymmetric digital subscriber loop (ADSL) and very-high-speed digital subscriber loop (VDSL). The 128-point architecture consists of an optimized pipeline implementation based on Radix-2 butterfly processor Element. To reduce power consumption and chip area, special current-mode SRAMs are adopted to replace shift registers in the delay lines. In low-power operation, when the supply voltage is scaled down to 2.3 V, the processor consumes 176mW when it runs at 17.8 MHz.

It is well known that new nanoscale materials useful for laser, medicine, display, etc. Applicati... more It is well known that new nanoscale materials useful for laser, medicine, display, etc. Applications have been carefully studied last decade. In the current paper the search for the effective nanostructured materials has been revealed in two directions: to optimize the mechanical and laser features of the inorganic systems and to improve the surface properties of the organics polaroid films with nanoobjects. It has been testified that the surface mechanical properties of the inorganic materials via nanotubes treatment process can be drastically improved. For example, the surface mechanical hardness of the UV and IR range "soft" inorganic materials can be increased up to 2-10 times under the conditions of oriented nanotubes placement. It has been obtained that the surface mechanical hardness of the organic polaroid films can be increased saving the spectral features. with nanostructured surfaces based on nanotubes". Tech. Phys. Lett. 2010 8 in publishing.

Computer Networks, 2009

Wireless sensor networks often consists of a large number of low-cost sensor nodes that have stri... more Wireless sensor networks often consists of a large number of low-cost sensor nodes that have strictly limited sensing, computation, and communication capabilities. Due to resource restricted sensor nodes, it is important to minimize the amount of data transmission so that the average sensor lifetime and the overall bandwidth utilization are improved. Data aggregation is the process of summarizing and combining sensor data in order to reduce the amount of data transmission in the network. As wireless sensor networks are usually deployed in remote and hostile environments to transmit sensitive information, sensor nodes are prone to node compromise attacks and security issues such as data confidentiality and integrity are extremely important. Hence, wireless sensor network protocols, e.g., data aggregation protocol, must be designed with security in mind. This paper investigates the relationship between security and data aggregation process in wireless sensor networks. A taxonomy of secure data aggregation protocols is given by surveying the current ''state-of-the-art" work in this area. In addition, based on the existing research, the open research areas and future research directions in secure data aggregation concept are provided.

In this paper a design of an performance analysis of FR-4 substrate for high frequency microstrip... more In this paper a design of an performance analysis of FR-4 substrate for high frequency microstrip antenna and inset-fed dual frequency circular microstrip antenna rectangular slot for application in wireless communication and parasitically loaded CPW fed monopole antenna for broadband operation. The circular microstrip antenna resonates at 1.58 GHz and 2.43 GHz, which enables it’s usage in the wireless communication domain such as in Wireless Local Area Network (WLAN).By varying the lengths of the rectangular slot, the proposed antenna can provide a tunable frequency ratio of 1.50 to 1.62 for the two operating frequency band. The performance of a low-profile coplanar waveguide (CPW)-fed monopole antenna comprising of a straight strip, a parasitic circular-hat patch, and a slotted CPW ground for broadband operation is presented. A measured dual-frequency operation with a broad impedance bandwidth(10 dB return loss) of 77% from 3.4–7.62 GHz, covering the required bandwidths of the low...

Today, ultracapacitors are a viable component for production aim designs in the power electronics... more Today, ultracapacitors are a viable component for production aim designs in the power electronics world. The need for highly reliable back-up and emergency power are creating significant markets for energy storage and power delivery. Electrical wind turbine pitch systems, uninterruptible power supplies and electronic products such as wireless communication devices and digital cameras are some of the many applications where ultracapacitors have been designed in. Ultracapacitors are components which have properties of a complexe capacitor system which is sensitive to voltage, temperature and frequency. The understanding of their behavior is primordial to characterize and operate them.

International journal of innovative research and development, 2013

In modern advancement of electronics world leads the research community towards the printed versi... more In modern advancement of electronics world leads the research community towards the printed version of all the devices, which is known as flexible electronics. In this paper we will describe the way to “print” devices directly onto the skin so people can wear them for an extended period while performing normal daily activities. Such systems could be used to track health and monitor healing near the skin’s surface, as in the case of surgical wounds.

Abstract-The main purpose was to provide an implementable design scenario for underground coal mi... more Abstract-The main purpose was to provide an implementable design scenario for underground coal mines using wireless sensor networks (WSNs). The main reason being that given the intricacies in the physical structure of a coal mine, only low power WSN nodes can produce accurate surveillance and accident detection data. The work mainly concentrated on designing and simulating various alternate scenarios for a typical mine and comparing them based on the obtained results to arrive at a final design. In the Era of embedded technology, the Zigbee protocols are used in more and more applications. Because of the rapid development of sensors, microcontrollers, and network technology, a reliable technological condition has been provided for our automatic real-time monitoring of coal mine. The underground system collects temperature, humidity and methane values of coal mine through sensor nodes in the mine; it also collects the number of personnel inside the mine with the help of an IR sensor,...

This paper proposes a technique of thin film graphene solar cell coating with anti reflecting lay... more This paper proposes a technique of thin film graphene solar cell coating with anti reflecting layer of titanium dioxide for absorbing the light energy. Ultra capacitor/super capacitor is used as a storage element in this paper, which is a excellent storage device as per now. The normal car battery can be replaced by ultra capacitor. The absorbed light energy is converted into electricity which will drive the car.

Image coding is to represent an image with as few bits as possible while preserving the level of ... more Image coding is to represent an image with as few bits as possible while preserving the level of quality and intelligibility required for the given application. In this project we use the Supervised Table Set-Partitioning In Hierarchical Trees (STSPIHT) algorithm. In which the lookup table is supervised for the transmission of images to preserve the brightness and contrast. Approach supports progressive transmission which makes maximum use of all previously transmitted data. With progressive transmission, one can have a rough picture of the image transmitted and access it before the end of the transmission. When this algorithm is implemented in the VLSI processor the number of gate levels is reduced. The processing speed for the transmission is increased by 85% when compared to the existing methods.

Software Defined Radio (SDR) is a recent technology evolving in the area of wireless communicatio... more Software Defined Radio (SDR) is a recent technology evolving in the area of wireless communications. Finite Impulse Response filters places an important role for designing SDR. To achieve the flexibility dynamically reconfigurable filters are need to be designed. In order to achieve that, this paper provides one method called constant shift elimination method based on the binary common sub expression algorithm. The goal of the constant shift elimination method is to identify multiple occurrences of identical bit patterns and eliminate the redundant multiplication. That will reduce the number of adders used to implement the coefficient multiplier used for designing dynamically reconfigurable FIR filters. Design examples shows that the proposed method offers good power reductions and speed improvement compared to the best existing reconfigurable FIR filter implementations.

International Journal of Innovative Research and Development, May 31, 2013

In modern advancement of electronics world leads the research community towards the printed versi... more In modern advancement of electronics world leads the research community towards the printed version of all the devices, which is known as flexible electronics. In this paper we will describe the way to "print" devices directly onto the skin so people can wear them for an extended period while performing normal daily activities. Such systems could be used to track health and monitor healing near the skin's surface, as in the case of surgical wounds.

The main purpose was to provide an implementable design scenario for underground coal mines using... more The main purpose was to provide an implementable design scenario for underground coal mines using wireless sensor networks (WSNs). The main reason being that given the intricacies in the physical structure of a coal mine, only low power WSN nodes can produce accurate surveillance and accident detection data. The work mainly concentrated on designing and simulating various alternate scenarios for a typical mine and comparing them based on the obtained results to arrive at a final design. In the Era of embedded technology, the Zigbee protocols are used in more and more applications. Because of the rapid development of sensors, microcontrollers, and network technology, a reliable technological condition has been provided for our automatic real-time monitoring of coal mine. The underground system collects temperature, humidity and methane values of coal mine through sensor nodes in the mine; it also collects the number of personnel inside the mine with the help of an IR sensor, and then transmits the data to information processing terminal based on ARM.

This paper presents a Microstrip planar Antenna for Ultra Wide Band frequency for cover a large b... more This paper presents a Microstrip planar Antenna for Ultra Wide Band frequency for cover a large bandwidth of 4GHz with the Resonance frequency of 5.8GHz.Here its wide applications like Medical Application, radar imaging technology, WLAN, Wi-MAX, PC Peripherals, Wireless mouse, satellite communications etc. The gain and directivity of the propose antenna is 2.66db and 3db respectively. for this design and simulation of antenna HFSS simulator is used .

WLAN requires low-cost and compact antennas with sufficient bandwidth. Chip antennas are particul... more WLAN requires low-cost and compact antennas with sufficient bandwidth. Chip antennas are particularly attractive as they are not substrate dependent and are solderable with standard reflow processes. Therefore, low-cost substrates can be used for the circuit board with no major consequence on radiation. Among possible antenna solutions dielectric resonator antennas (DRAs) offer an assembly that is surface mount technology (SMT) process compatible and their manufacturing can be based on standard processes. They also exhibit excellent properties regarding bandwidth and quasi omni directional radiation. When compactness is a main issue, conducting plates can be placed at the electric walls of the fundamental mode of the DRA to reduce its dimensions. However, this also decreases the bandwidth. Wider bandwidth structures have been proposed but they remain larger compared to a wavelength. In this paper, we propose a new DRA topology with both reduced size and large bandwidth. It has been designed for the low band of Hiperlan2 and IEEE802.11a standards [5.15-5.35] GHz. The proposed structure has been optimised using 3D EM simulations and is compared to a more conventional compact design. A novel technique for producing enhanced band width in micro and mm wave region of spectrum is presented. A new design of compact & broadband wave dielectric resonator antenna is proposed using co-axially probe feed technique. Two different WDRA are designed and their characteristic behaviors are compared. Finally, parametric study of Second Antenna has been done. With the proper design the resonant behavior of the antenna is found, over which the leaky wave DRA produces extended bandwidth. Numerous designs for the WRDRA are simulated and bandwidths exceeding 20% are achieved.

Market trends and consumer demands for enhanced ergonomic feel and touch, grippability, aesthetic... more Market trends and consumer demands for enhanced ergonomic feel and touch, grippability, aesthetics, cushioning against impact, vibration isolation and insulation have driven novel developments in thermoplastic elastomers for overmolding applications. Principles of adhering soft elastomer to a rigid substrate as well as utilizing novel thermoplastic elastomers for various overmolding applications are detailed in this paper.

A probe feed, slotted hexagonal patch antenna has been proposed. Bandwidth enhancement has been i... more A probe feed, slotted hexagonal patch antenna has been proposed. Bandwidth enhancement has been improved by suitably cutting slots into hexagonal patch. Proposed antenna is suitable for various telecoms, LAN, Wi-Fi applications in ISM-band. It is demonstrated that the proposed antenna exhibits resonance in ISM-Band and a peak gain of 6dBi.The antenna structure is described and simulated results are presented.

Within materials science, the optical properties of carbon nanotubes refer specifically to photol... more Within materials science, the optical properties of carbon nanotubes refer specifically to photoluminescence, and Raman spectroscopy of carbon nanotubes. Spectroscopic methods offer the possibility of quick and non-destructive characterization of relatively large amounts of carbon nanotubes. There is a strong demand for such characterization from the industrial point of view: numerous parameters of the nanotube synthesis can be changed, intentionally or unintentionally, to alter the nanotube quality. As shown below, optical absorption, photoluminescence and Raman spectroscopies allow quick and reliable characterization of this "nanotube quality" in terms of non-tubular carbon content, structure (chirality) of the produced nanotubes, and structural defects. Those features determine nearly any other properties such as optical, mechanical, and electrical properties. Key words: Carbon nanotube (CNT), Single wall carbon nanotube (SWCNT), Multiwall carbon nanotube (MWCNT) ISSN: ...

Computer Networks, 2009

International journal of innovative research and development, 2013

International Journal of Innovative Research and Development, May 31, 2013

In modern advancement of electronics world leads the research community towards the printed versi... more In modern advancement of electronics world leads the research community towards the printed version of all the devices, which is known as flexible electronics. In this paper we will describe the way to "print" devices directly onto the skin so people can wear them for an extended period while performing normal daily activities. Such systems could be used to track health and monitor healing near the skin's surface, as in the case of surgical wounds.