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Memcapacitor Emulator with Off-the-Shelf Devices
Maheshwar Pd. Sah(마헤스워 샤파라),Ramkaji Budhathoki(람 카지 부다토기),Changju Yang(양창주),Hyeon Cheol(최현철),Hyongsuk Kim(김형석) 제어로봇시스템학회 2013 제어로봇시스템학회 각 지부별 자료집 Vol.2013 No.12
We built a memcapacitor emulator with off-the-shelf electronic devices. The memcapacitor is an element whose capacitance can be altered with external current or voltage. The implementation of the emulator is very important since commercial versions are not yet available. The proposed memcapacitor emulator has a simple dedicated memcapacitor architecture that does not require a mutator. It is the first memcapacitor emulator implemented with commercially available devices. The operation as a memcapacitor has been proven via both breadboard experiments and PSPICE simulations.
A Feed forward Differential Architecture for the Analog PRML Viterbi Decoder
Maheshwar Pd. Sah(마헤스워 사),Changju Yang(양창주),Hyongsuk Kim(김형석) 제어로봇시스템학회 2010 제어로봇시스템학회 합동학술대회 논문집 Vol.2010 No.12
In this paper, an analog parallel processing circuit in the form of feed forward differential architecture is proposed to implement on analog PRML Viterbi decoder. It is based on the idea that the decoding of PRML is done mainly with the information of the first several number of stages. Several benefits including higher speed, no path memory, no trace back unit and no A/D converter are required for the decoding of the signals. Most of the conventional analog parallel processing-based PRML decoders are differential architecture with the feedback, where states are changed depending on the previous decoded data. The architecture used in this paper is without feedback, where error metric accumulation is allowed to start from odd and even input of subtrellis. It is simpler than that of the conventional analog parallel processing structure with similar decoding performance. The feature of proposed architecture is investigated through simulation results.
Electrical and optical properties of semiconducting camphoric carbon films
Maheshwar Sharon,Debabrata Pradhan,Yoshinori Ando,Xinluo Zhao 한국물리학회 2002 Current Applied Physics Vol.2 No.6
In situ variation in resistance of camphoric carbon versus time of pyrolysis, temperature of pyrolysis and eect of sintering arestudied to perceive the time required for the completion of pyrolysis and the activation energy from the electrical conductance plot.Variation in the electrical conductance versus temperature and activation energies derived from these measurements, are repro-ducible when lm is thermally treated below 750.C. Thermal treatment above 750.change in the conductance prole as well as decreases its band gap to 0.1 eV. Camphor pyrolyzed at 650.C gives semiconductingcarbon with optical band gaps 1 eV (direct) and 0.8 eV (indirect). Increase in pyrolysis temperature also shifts G-band of Ramanspectrum from 1605 to 1586 cm. 1 i.e., towards value corresponding to graphitic carbon. SEM micrograph of camphoric lm showsabsence of any carbon nanobeads or bers as normally observed with camphoric carbon pyrolysed in this temperature range.
Laser Ablated Carbon Thin Film from Carbon Nanotubes and Their Property Studies
Maheshwar Sharon,M. Rusop,T. Soga,Rakesh A. Afre 한국탄소학회 2008 Carbon Letters Vol.9 No.1
A carbon nanotube (CNT) of diameter ~20 nm has been synthesized by spray pyrolysis of turpentine oil using Ni/Fe catalyst. Pellet of CNTs has been used as a target to produce semiconducting carbon thin film of band gap 1.4 eV. Presence of oxygen pressure in the pulse laser deposition (PLD) chamber helped to control the sp3/sp2 ratio to achieve the desired band gap. Results are discussed with the help of Raman spectra, SEM TEM micrographs and optical measurements suggest that semiconducting carbon thin film deposited by PLD technique has retained its nanotubes structure except that its diameter has increased from 20 nm to 150 nm.
Hydrogen Storage by Carbon Fibers Synthesized by Pyrolysis of Cotton Fibers
Maheshwar Sharon,Madhuri Sharon,Golap Kalita,Bholanath Mukherjee 한국탄소학회 2011 Carbon Letters Vol.12 No.1
Synthesis of carbon fibers from cotton fiber by pyrolysis process has been described. Synthesis parameters are optimized using Taguchi optimization technique. Synthesized carbon fibers are used for studying hydrogen adsorption capacity using Seivert's apparatus. Transmission electron microscopy analysis and X-ray diffraction of carbon fiber from cotton suggested it to be very transparent type material possessing graphitic nature. Carbon synthesized from cotton fibers under the conditions predicted by Taguchi optimization methodology (no treatment of cotton fiber prior to pyrolysis, temperature of pyrolysis 800℃, Argon as carrier gas and paralyzing time for 2 h) exhibited 7.32 wt% hydrogen adsorption capacity.
Charge Controlled Meminductor Emulator
Maheshwar Pd. Sah,Ram Kaji Budhathoki,Changju Yang,Hyongsuk Kim 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.6
Emulations of memristor-family elements are very important, since their physical realizations are very difficult to achieve with recent technologies. Although some previous studies succeeded in designing memristor and memcapacitor emulators, no significant contribution towards meminductor emulator has been presented so far. The implementation of a meminductor emulator is very important, since real meminductors are not expected to appear in near future. We designed the first meminductor emulator whose inductance can be varied by an external current source without employing any memrisitve system. The principle of our architecture and its feasibility have been verified using SPICE simulation.
Memristor Circuit for Artificial Synaptic Multiplication
Maheshwar Pd. Sah(마헤스워 사),Changju Yang(양창주),이청호,Hyongsuk Kim(김형석) 제어로봇시스템학회 2011 제어로봇시스템학회 각 지부별 자료집 Vol.2011 No.7
A memristor circuit is proposed to synaptic multiplication of artificial neural networks by using ohms law v = M(q) x i. The weight and synaptic processing can be performed positively or negatively through a share input terminal. Several benefits like compact integration, lower power consumption and analog processing is applicable in the circuit. The simulations of the proposed circuit are analyzed with Hewlett-Packard (HP) TiO₂ memristor model.
Acacia mangium Willd. - A Fast Growing Tree for Tropical Plantation
Maheshwar Hegde,K. Palanisamy,Jae Seon Yi 강원대학교 산림과학연구소 2013 Journal of Forest Science Vol.29 No.1
Acacia mangium is an evergreen fast-growing tropical tree, which can grow up to 30 m tall and 50 cm thick, under favorable conditions. It is a low-elevation species associated with rain forest margins and disturbed, well-drained acid soils. It is native to Papua, Western Irian Jaya and the Maluku islands in Indonesia, Papua New Guinea and north-eastern Queensland in Australia. Due to its rapid growth and tolerance of very poor soils, A. mangium was introduced into some Asian, African and western hemisphere countries where it is used as a plantation tree. A. mangium has good quality wood traits, such as a comparatively low proportion of parenchymatous cells and vessels, white and hard wood, and high calorific value. Therefore, it is useful for a variety of purposes, such as furniture, cabinets, turnery, floors, particleboard, plywood, veneer, fence posts, firewood, and charcoal. It is also being used in pulp and paper making because it has good pulp traits, with high yields of pulp, quality of kraft, and produces paper with good optical, physical and surface properties. Because there are significant provenance differences in growth rate, stem straightness, heartwood formation and frequency of multiple leaders, the productivity and quality also varies depending upon environmental conditions, so genetic improvement programmes have been undertaken in countries like Australia, India, Indonesia, Malaysia, the Philippines, Taiwan and Thailand. The programme includes provenance identifications and testing, plus tree selection and clonal multiplication, establishment of seed orchards and hybridization. The phenology, reproductive biology, fruit characteristics, silvicultural practices for cultivation, pest and diseases problems, production of improved planting stock, harvesting, wood properties and utilization have been discussed in this paper.
CERTAIN RELATIONS FOR MOCK THETA FUNCTIONS OF ORDER EIGHT
Pathak, Maheshwar,Srivastava, Pankaj Korean Mathematical Society 2009 대한수학회논문집 Vol.24 No.4
The aim of the present paper is to establish certain relations for partial mock theta functions and mock theta functions of order eight with other partial mock theta functions and mock theta functions of order two, six, eight and ten respectively.
Charge Controlled Meminductor Emulator
Sah, Maheshwar Pd.,Budhathoki, Ram Kaji,Yang, Changju,Kim, Hyongsuk The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.6
Emulations of memristor-family elements are very important, since their physical realizations are very difficult to achieve with recent technologies. Although some previous studies succeeded in designing memristor and memcapacitor emulators, no significant contribution towards meminductor emulator has been presented so far. The implementation of a meminductor emulator is very important, since real meminductors are not expected to appear in near future. We designed the first meminductor emulator whose inductance can be varied by an external current source without employing any memrisitve system. The principle of our architecture and its feasibility have been verified using SPICE simulation.