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Search Results: 1 - 10 of 15209 matches for " Dr. Gautam Das "
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An Overview of Microcontroller Unit: From Proper Selection to Specific Application
Manas Kumar Parai,Banasree Das,Dr. Gautam Das
International Journal of Soft Computing & Engineering , 2013,
Abstract: It is very difficult to choose a particular Microcontroller for specific application. Success or failure of any project largely depends on proper selection of the Microcontroller Unit. In this paper a brief overview of the unit is described as far as the right selection for particular application is concerned. So many manufactures are producing microcontroller in bulk amount. Comparison is based on products of few leading manufactures. System requirements, availability, performance, size, power dissipation, flexibility, Reliability, Maintainability, Environmental constraints, software support, correctness, safety, Cost, manufacturer’s history and track records are the vital factors to be considered whenever a system is to be implemented using a microcontroller which is the heart of the device. In this paper several factors are focused and follow up of those factors leads to success of the project.
Clinical Implications and Management of Sub Clinical Hyperthyroidism: A Review  [PDF]
Parijat De, Terence Pang, Gautam Das
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2012, DOI: 10.4236/ojemd.2012.23004
Abstract: Sub clinical hyperthyroidism (SCH) is characterized by normal free thyroid hormone concentrations along with a low or undetectable serum TSH (thyrotropin) level. The increased use of TSH as a screening measure and improved assay sensitivity is contributing to the diagnosis of sub clinical hyperthyroidism more frequently than ever in our clinical practise leading to the increased prevalence of the disease. The significance of SCH remains uncertain for most patients as some will revert to normal thyroid status over time whereas others will either remain static or progress to overt thyroid disease in the future. The detrimental effects of a persistently suppressed TSH has now been extensively studied and its effect on the cardiovascular system, the skeleton, mood disturbance, quality of life is quite significant leading to considerable morbidity and mortality. Majority of the patients are asymptomatic and lack overt features but the relevance of treatment is more focussed in elderly patients where the risk of developing cardiac arrhythmia and loss of bone mineral density is much more than young people in whom a conservative approach is usually preferred. The issue is contentious, the situation is challenging and the benefits of treatment are debatable. The consensus for who, when and how to treat is growing but still hasn’t been universally accepted. We attempt to review the recent literature available for sub clinical hyperthyroidism and suggest an analytical approach to its investigations and management.
The Concept of Universal Brotherhood And Buddhism
Dr. Gautam Kumar Sinha
Indian Streams Research Journal , 2012,
Abstract: "At the very outset, it is significant to explain the meaning of Universal Brotherhood as this concept has scientific origin and rational justification. In fact, the philosophy of Universal Brotherhood is the basic tenet of the philosophy of 'Theosophy' which holds and sees that the entire species of Homo Sapiens belong to one large family. Although, this one family is divided in to different branches but ultimately, they are connected to one another as a tree of humanity. The essence of the philosophy of Theosophy or Universal Brotherhood is “kindness for all living beings”.
Letters to the Editor
Dr. Shikha Gautam
Australasian Medical Journal , 2011,
Abstract: .
Recurrent Herpes Zoster- A Marker of AIDS
Mazumdar Gautam,Das Sudip
Indian Journal of Dermatology , 2003,
Abstract: A 32 year old female presented to us with herpes zoster involving the T 8 to T 10 dermatomes. She had a scar involving the same dermatomes on the other half of the body. Investigations revealed that both the patient and her husband were HIV positive with CD4 cell count less than 200.
Porokeratosis Masquerading As Lupus Vulgaris
Das Sudip,Banerjee Gautam
Indian Journal of Dermatology , 2004,
Abstract: Porokeratosis is a specific disorder of kerstinization characterized histologically by cornoid lamella. Lesions of porokeratosis present varied features, often mimicking other dermatological disorders. Herein, we report a case of porokeratosis of Mibelli presenting with verrucous lesions simulating lupus vulgaris.
Liberalization Impact on Indian Small Industries: An Empirical Study of Punjab
Dr. Raj Kumar Gautam,Dr. Raghbir Singh
Business Intelligence Journal , 2012,
Abstract: The aim of the paper is to study the impact of liberalization on the Indian Small-Scale Industry in the leading industrial state of Punjab. After liberalization SSI is facing lot of challenges in various areas such as marketing issues , more competition, customer management and retention and shift in labour and capital. The factors which can boost the small business have also been highlighted in the paper. A number of statements indicating the impact of liberalization on SSI have been developed and the respondents were asked to express their level of agreement/disagreement with these statements on five-point Likert scale. Kruskal-Wallis test has been applied to know the significant differences among the respondents relating to different industries, age and turnover groups with respect to these statements. The test has been applied at assumed p-value =0.05. The statements with less than 0.05 p-value are considered significant and those with p-value more than the assumed value are considered to be insignificant.
Tunable Single-Longitudinal-Mode High-Power Fiber Laser
Jonas K. Valiunas,Gautam Das
International Journal of Optics , 2012, DOI: 10.1155/2012/475056
Abstract: We report a novel CW tunable high-power single-longitudinal-mode fiber laser with a linewidth of 9?MHz. A tunable fiber Bragg grating provided wavelength selection over a 10?nm range. An all-fiber Fabry-Perot filter was used to increase the longitudinal mode spacing of the laser cavity. An unpumped polarization-maintaining erbium-doped fiber was used inside the cavity to eliminate mode hopping and increase stability. A maximum output power of 300?mW was produced while maintaining single-longitudinal-mode operation. 1. Introduction Fiber lasers are established as robust and reliable devices with a variety of applications in industry and medicine due to their unique characteristics, such as all-fiber designs, compact size, cost-effective production and operation, and the no need for realignment or external cooling. High-power single-wavelength and multiwavelength infrared fiber lasers are very attractive for applications in optical communications, sensing, spectroscopy, biomedical instrumentation, and nonlinear optics. The continued progress in fiber pumping techniques, advanced fiber designs, and fabrication processes, as well as the availability of high-power pump diodes, has assisted in the development of high-power fiber lasers [1–5]. Fiber lasers have found applications in temperature and strain sensors [6–11], medical diagnostics [12–14], and industrial processing [15]. High-power fiber lasers using erbium-ytterbium codoped fibers as the gain medium, which operates in the eye-safe (1.5?μm to 1.6?μm) spectral range, can now compete with traditional solid-state bulk lasers. The applications of recently reported single-wavelength [16, 17] and multiwavelength [18, 19] high-power fiber lasers were limited due to large linewidth of the lasing wavelength, multi-longitudinal-mode oscillations, small tuning range, and complex designs. In this paper we present a novel tunable, high-power, single-wavelength, single-longitudinal-mode, fiber ring laser. 2. Experimental Setup The experimental setup of the fiber laser is shown in Figure 1. The resonant cavity consists of a high-power polarization-independent optical isolator (OI), which guaranteed the unidirectional propagation and thus eliminated the spatial hole-burning effects [20]; an all-fiber polarization controller; a commercially available tunable fiber Bragg grating (TFBG) with a tuning range of 10?nm (1565?nm–1575?nm); a 4?m long double-clad erbium-ytterbium codoped (DC-EYDF) fiber with core/cladding diameters of 10/131?μm which was used as the gain medium. In general to produce high output power from a
Improved Interference in Wireless Sensor Networks
Pragya Agrawal,Gautam K. Das
Computer Science , 2012,
Abstract: Given a set ${\cal V}$ of $n$ sensor node distributed on a 2-dimensional plane and a source node $s \in {\cal V}$, the {\it interference problem} deals with assigning transmission range to each $v \in {\cal V}$ such that the members in ${\cal V}$ maintain connectivity predicate ${\cal P}$, and the maximum/total interference is minimum. We propose algorithm for both {\it minimizing maximum interference} and {\it minimizing total interference} of the networks. For minimizing maximum interference we present optimum solution with running time $O(({\cal P}_n + n^2) \log n)$ for connectivity predicate ${\cal P}$ like strong connectivity, broadcast ($s$ is the source), $k$-edge(vertex) connectivity, spanner, where $O({\cal P}_n)$ is the time complexity for checking the connectivity predicate ${\cal P}$. The running time of the previous best known solution was $O({\cal P}_n \times n^2)$ [Bil$\grave{o}$ and Proietti, 2008]. For the minimizing total interference we propose optimum algorithm for the connectivity predicate broadcast. The running time of the propose algorithm is O(n). For the same problem, the previous best known result was $2(1 + \ln (n-1))$-factor approximation algorithm [Bil$\grave{o}$ and Proietti, 2008]. We also propose a heuristic for minimizing total interference in the case of strongly connected predicate and compare our result with the best result available in the literature. Experimental results demonstrate that our heuristic outperform existing result.
A New Technique of Developing a CPLD Based System for Wireless Device Control through Mobile Phone
Manas Kumar Parai,Gautam Das,Banasree Das
International Journal of Recent Technology and Engineering , 2012,
Abstract: Sometimes it is very much essential to control thehome appliances and different devices from a far distance. Thispaper gives an idea of developing a system which will enable userto control from a remote using a mobile phone based interface.Within the large coverage area of the service provider mobilephone is used to control the devices which may be locatedgeographically far apart. CPLD is used here to direct theinterfacing circuitry either to switch on or off the devicesconnected with it. CPLD based system is used due to fasterimplementation and hardware verification facilities. The device isprogrammable and reconfigurable. This is one of the mostpowerful advantages of using the device where the program is tobe changed frequently for some specific applications. Thefunctions associated with the assigned keys are stored in theCPLD. It processes the data coming from the output of a DTMFdecoder and generates the output according to the key pressedfrom the mobile phone at the transmitting end. Xilinx 9.2isoftware is used to write the program in VHDL and the hardwareis implemented with the help of VLSI trainer kit (Model:UNI-BSX-M1, Manufacturer: Milman).
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