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Photosensitive materials on flexible substrates with integrated barrier foil is advantageous as the barrier acts as a protector from the unwanted atmospheric elements that degrades the lifetime of the organic-photovoltaic (OPV) modules. The choice of efficient transparent conductive electrodes [1] are one of the important aspects for developing organic optoelectronic devices such as OPV's. Although...
This paper aims to improve locality of references by suitably choosing array layouts. We use a new definition of spatial reuse vectors that takes into account memory layout of arrays. This capability creates two opportunities. First, it allows us to develop an array restructuring framework based on a combination of hyperplane theory and reuse vectors. Second, it allows us to observe the effect of...
We present a cache locality optimization technique that can opitimize a loop nest even if the arrays referenced have different layouts in memory. Such a capability is required for a global locality optimization framework that applies both loop and data transformation to a sequence of loop nests for optimizing locality. Our method finds a non-singular iteratio-space transformation matrix such that...
Heart of satellite based navigation system is timing by precise clocks. In Global Navigation Satellite System (GNSS,) mainly consisting of GPS, GLONASS, Galileo and Beiduo, timing plays a vital role also. Coordination of the time scales of all these systems is very important for the optimum utilization of GNSS. It has some stringent requirements. Coordination among different constellations is also...
The post fault transient stability of the power system is assessed in this paper using Maximum Lyapunov Exponent (MLE). The phase angles, reported by the PMUs at the generator buses are used for estimating the MLE of the system. The sign and the magnitude of the MLE serve as indicators to the stability of the system. The method utilized for estimation of the MLE is independent of the system model...
A multiquantum well (MQW) double-drift region (DDR) impact avalanche transit time (IMPATT) device based on Si/3C-SiC material system has been proposed for high frequency application. One symmetrical and two asymmetrical doping profiles for the proposed hetero-structure device are considered in the present study. The design and optimization of the abovementioned three doping profiles of SÌ/3C-SÌC MQW...
Full length Pseudo Random Noise (PRN) sequences are widely used in CDMA communication. The full length sequence number is not easily divisible. So it is not easy to generate a frequency of this value (equivalent to full length sequence) or multiple or sub-multiple thereof from a standard value of available crystal or frequency source. Truncation of few bits from the full length may reduce this problem...
Truncation of full length Pseudo Random Noise (TPRN) sequence is gaining attention. Random properties of TPRN have been studied and reported. But no work has been initiated to study the effect on TPRN when it is modulated by Binary Offset Carrier (BOC). This paper examines the characteristics of autocorrelation function for BOC modulated TPRN. Simulation in Matlab has been carried out for this purpose...
Cognitive Radio (CR) technology constitutes a new paradigm where wireless devices can access the spectrum left unused by licensed or primary users in an opportunistic way. At the same time, these unlicensed secondary users (SUs) must reliably detect the presence of licensed primary transmission to avoid interfering with them. Information about primary users (PUs) locations are very important in Cognitive...
The nano-film of diamond-like carbon (DLC) is coated on the inner walls of microfluidic laboratory-on-a-chip devices as microchannel bends fabricated by microelectronic processes. Maskless lithography and hot embossing lithography techniques are used to fabricate these micron-scale devices. The microfluidic flow of water is controlled by the level of surface wettability of DLC coating inside the microchannel...
The design, construction and operational characteristics of a portable flash X-ray source driven by battery-powered compact Marx is reported. The novel configuration of compact Marx utilizes hollow capacitors in successive stages to enhance the erection reliability. The characteristic impedance of this system is ∼200Ω. At discharge of ∼22kV, >200kV output pulse of 60ns duration (FWHM) with rise...
A Marx generator delivers high power electrical pulse in very short duration and can be configured to be compact. This ultrafast coaxial Marx generator has also been developed without pulse shaping/peaking circuit. The results of 5-stage ultrafast coaxial Marx generator has a rise time of 800ps, maximum output voltage 75kv, pulse width(FWHM) of 1.5ns, and source impedance 63Ω is presented. The coaxial...
Modern advancement in efficient and affordable electronic devices has developed a huge range of applications in the domain of wireless networks. An essential problem addressed in this Wireless sensor network is that the nodes communicate with each other or with base station without any network infrastructure or central administration. They can communicate using wireless channels and can exchange data...
Cognitive Radio has arrested the attention of researchers for the simple reason of optimum utilization of available spectrum of wireless communication in the recent scenario. The spectrum sensing by energy detection is one of the techniques for detecting spectrum holes. This paper revisits the existing energy detection technique. The influence of dynamic threshold and noise uncertainty factor on performance...
Fuzzy logic has long been used for control system, but not much effort has been put to use it for data smoothing. In this paper it has been attempted to find the average of a set of data by applying Fuzzy logic. Generation of membership function is crucial in such application. So this issue has been discussed in detail. This method has been applied on some arbitrarily generated test data for establishing...
Bus voltage and current phasors in a power system network undergo dynamic variations under system disturbances and faults. With the advent of synchrophasors, it is possible to measure these phasors within a cycle. However, fast prediction of rate of change of these phasors and acceleration of changes will find direct applications in system protection and stability prediction. This work has proposed...
In this paper a novel method based on the concept of time varying depletion width modulation at large-signal levels is proposed to obtain the parasitic resistance of the inactive region of Ka-band Silicon Single-Drift Region (SDR) Impact Avalanche Transit Time (IMPATT) diodes. A complete simulation software based on non-sinusoidal voltage excitation method is developed to obtain the large-signal electric...
Truncation of few bits from the full length Pseudo Random Noise (PRN) sequence causes the appearance of a truncation noise in their autocorrelation deteriorating considerably the system performance. Sometimes, there is the need to shorten the PRN-sequence to decrease the acquisition time and to match the data field size in frame structures. Some properties of truncated PRN sequences have been studied...
In this paper the effect of temperature transient on the large-signal properties and frequency chirping of 94 GHz pulsed silicon Double-Drift Region (DDR) Impact Avalanche Transit Time (IMPATT) device is investigated. A transient thermal model and a large-signal simulation method based on non-sinusoidal voltage excitation have been developed by the authors' to study the effect temperature transients...
The authors have made an attempt to study the millimeter-wave properties and noise performance of Si∼Si1−xGex anisotype heterojunction Double-Drift Region (DDR) Mixed Tunneling Avalanche Transit Time (MITATT) devices operating at 94 GHz. A computer simulation technique based on driftdiffusion model is used for the present study. Two different mole fractions, x = 0.1 and x = 0.3 of Ge and four types...
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