Dual Scheme Research Articles

Dentro do círculo: sobre teatro e literatura dramática

A major trend in theatre studies divides theatre into two types: the literary and the non‑literary theatre. This essay demonstrates how such partition restricts the way we look at performances and read drama, but also how it influences the relationship between both arts, confining them to a narrative of tensions within an antithetic and dual scheme. For that reason, when we say that theatre is dif‑ ferent from literature, this assertion is necessarily accompanied by the presum‑ ably antithetic claim that theatre and literature are identical, as if one assertion could not be understood without the other. This essay seeks an alternative to the preponderance of these ideas in order to escape from their authority. By following a certain tradition of epistemology, one can find an ampler perspec‑ tive, one that liberates theatre and literature from a correlationist logic sustained by a concept of knowledge that aims to achieve certainty and unanimity. Through the use of a different idea of knowledge and being, we will be better positioned to meet and acknowledge the invisibility of things (be it a performance, a play or a person). THEATRE / DRAMA / THEATRE STUDIES / CORRELATIONISM / ONTOLOGY

Security aware dual authentication-based routing scheme using fuzzy logic with secure data dissemination for mobile ad-hoc networks

Security aware dual authentication-based routing scheme using fuzzy logic with secure data dissemination for mobile ad-hoc networks

Cascaded Lifting Wavelet and Contourlet Framework Based Dual Stage Fusion Scheme for Multimodal Medical Images

Cascaded Lifting Wavelet and Contourlet Framework Based Dual Stage Fusion Scheme for Multimodal Medical Images

A duality recipe for non-convex variational problems

The aim of this paper is to present a general convexification recipe that can be useful for studying non-convex variational problems. In particular, this allows us to treat such problems by using a powerful primal–dual scheme. Possible further developments and open issues are given.

Influence of the dynamic Stark effect on long-term frequency stability of a self-oscillating magnetometer with laser-pumped alkali atoms

This paper presents the results of investigation Stark shift effect influence on the long-term stability of a dual scheme of quantum magnetometers. Such scheme allows suppressing Stark shift components when a certain pumping light polarization is applied. As a result, long-term stability of a quantum sensor increases. However, when low-frequency (LF) and microwave fields are attached to a single vapor cell a coherence circulation in hyperfine structure of alkali atoms takes place. Physical origin of this effect is associated with the so called “dressed” atom theory, when atom is “dressed” by LF field. It yields in multiphoton absorption and resonance frequency shift. First estimates for this shift based on density matrix evolution formalism are provided in the paper.

Intercore Crosstalk in Homogeneous Multicore Fibers: Theoretical Characterization of Stochastic Time Evolution

A time-varying phase shift associated with each phase matching point of homogeneous weakly coupled multicore fibers is proposed to describe the stochastic time evolution of the intercore crosstalk (ICXT) observed experimentally. This model for the stochastic ICXT time evolution represents a generalization of current ICXT theoretical models and potentiates the development of new time-adaptive ICXT mitigation techniques. The model is first proposed considering a single polarization scheme, and is then generalized to a dual polarization scheme and to account for the polarization coupling between cores. Comparison between spectrograms of the crosstalk transfer function (XTTF) amplitude evaluated using the single polarization model and measured experimentally shows excellent agreement for short (few minutes) decorrelation times. For large decorrelation times (above 1 h), some differences in the behavior of the time evolution of the XTTF amplitude are observed. Nevertheless, excellent match between the mean and variance of the XTTF amplitude evaluated from the model and from analytical expressions proposed in the literature is observed for short and large decorrelation times. It is also shown that the decorrelation time of the short-term average crosstalk remains unchanged when the dual polarization scheme is considered. Similar spectrograms of the XTTF obtained with the single and dual polarization ICXT models are also shown.

A thermal protection module for automotive integrated circuits

Automotive ICs work in wide ambient temperature range up to 150[Formula: see text]C. It is important to design an over temperature protection mechanism for the reliability of ICs and systems. A thermal protection module for the automotive ICs is reported in this paper. Dual channel detection and decision scheme was designed based on band gap voltage reference. Precision thermal protection point was set by serial resistors and the variations of power supply, temperature and the process were removed by the resistor ratio. The thermal protection module was implemented in CSMC 0.5 [Formula: see text] 60 V BCD process, incorporated in a CAN transceiver chip. The area of the module was about 0.02 mm2 and thus it was very compact and low cost to integrate in chips. The performance of the thermal protection parameters was measured in incubators. The thermal shutdown temperature was about 164.4[Formula: see text]C and the thermal recovery temperature was about 153[Formula: see text]C with hysteresis temperature of 10 K. Additionally, the thermal protection module showed good consistency with different chips.

Multi-sensor data fusion for low power transmission of wireless sensor network in a greenhouse

The Wireless Sensor Network (WSN) is widely used for the acquisition of distributed greenhouse micro-climate data, such as temperature, humidity, CO2 concentration and solar radiation. In this paper the communication reliability of a WSN was evaluated based on experimental data within the greenhouse. In order to reduce redundant and invalid data to achieve a low power transmission, this paper proposes two kinds of multi-sensor data fusion scheme depending on the characteristics of the parameters. For parameters that change slowly (such as temperature, humidity, and CO2), a time fusion algorithm which can detect the time consistency of data is used to reduce the amount of data transmitted. The spatial fusion based on the supporting vector is used to give the final decision variable for the control system. For rapidly-changing parameters such as solar radiation, this paper proposes the Dual Prediction Scheme (DPS) based on an adaptive model selection to reduce the amount of data transmitted, with a spatial fusion algorithm based on GIA (Grey Incidence Analysis) for the aggregator. The data fusion schemes were implemented and tested in a greenhouse at the Tongji University Jiading Campus. The implementation results showed that the data fusion schemes can guarantee the sensor precision, and also significantly reduce the amount of data transmitted, which means prolonging the lifetime of the network.

Improving the construction of ORB through FPGA-based acceleration

Binary descriptors have won their place as efficient and effective visual descriptors in several vision tasks. In this context, one of the most widely used binary descriptors to date is the ORB descriptor. ORB is robust against rotation changes, and it uses a learning procedure to generate sampling pairwise tests to construct the descriptor. However, this construction involves a sequential memory access of as many steps as the binary string size. From the latter and motivated by the fact that modern computer vision tasks may require the construction of thousands, if not millions of binary descriptors, we propose to accelerate the construction process of the ORB descriptor via an FPGA-based hardware architecture. The latter is leveraged with a novel arrangement of pairwise tests, which takes advantage of a dual random access memory scheme achieving an acceleration of up to 17 times when compared against the sequential way. The empirical assessment indicates that ORB descriptors obtained from the proposed approach keep a similar performance to that of the original ORB.

Optimal Dual Pricing and Passenger Safety Level for Cruise Revenue Management

Despite the remarkable continual growth of the world cruise industry, studies have yet to be attempted on many revenue management problems in cruise operations. This paper suggests two schemes that can be easily applied to cruise revenue management: optimal dual pricing and passenger safety level. In optimal dual pricing, a pair of higher and lower prices is applied to cabin reservation through market segmentation. This scheme can be executed with a linear price-response function for the current unreserved cabins. A cruise line could benefit from this scheme to maximize reservation revenue while attaining full occupancy. The dual pricing scheme is also devised to produce only integer demands to suit real management practices. The life boat capacity is an additional service capacity unique to the cruise industry, catering to passengers’ safety. The concept of passenger safety level is defined and computed for any passenger life boat capacity of a cruise ship. It can be used to evaluate the passenger safety of a cruise ship in operation, as well as to determine the number of life boat seats required for a new cruise ship. Hypothetical examples are used to illustrate the operation of these two schemes.

A New Distillation Process for the Upgrading of Acid Gas

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 183154, “The Potential of a New Distillation Process for the Upgrading of Acid Gas,” by L.A. Pellegrini, G. De Guido, S. Langé, and S. Moioli, Politecnico de Milano, and B. Picutti, P. Vergani, G. Franzoni, and F. Brignoli, Tecnimont, prepared for the 2016 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, 7–10 November. The paper has not been peer reviewed. In this work, the potential of a new low-temperature distillation process for natural-gas sweetening has been investigated. The proposed technology consists of a dual pressure-distillation scheme designed to avoid the formation of a solid phase in all parts of the process while remaining able to fulfill the required natural-gas-purity specifications. The new process offers the competitive advantages of low-temperature technologies while avoiding carbon dioxide (CO2) solidification and solvent addition. Introduction The industry must find technologies that allow the profitable exploitation of low-quality and high-CO2-content gas reserves in order to meet increasing demand while still decreasing production costs. Low-temperature processes are preferred to traditional chemical or physical absorption for gas purification when the CO2 concentration in natural-gas streams is high. For this reason, attention on low-temperature processes for CO2 removal has increased in recent years. In this work, an analysis has been carried out to determine the trade-off between classical methyldiethanolamine (MDEA) gas-sweetening units, still representing the industry benchmark for acid- and sour-gas purification, and a low-temperature distillation process. The MDEA unit typically requires steam at the reboiler of the regeneration column, while the low-temperature distillation processes consume electric energy to drive the refrigeration cycle. In amine regeneration units, the steam consumption is a significant part of the total energy demand of the process and thus of the total operating costs. The complete paper defines a merit-index function to determine the trade-off between the two considered technologies. The Low-Temperature Process The new process for the low-temperature purification of natural gas is based on a dual-pressure (approximately 40/50 bar) low-temperature distillation operation, designed to bypass the solid/liquid/vapor (SLV) locus of the methane (CH4) and CO2 binary mixture through a proper thermodynamic pathway. In this work, an optimized process layout has been taken into account. The gas stream to be purified is fed to the high-pressure (HP) section at its dewpoint; in this first part of the distillation unit, the natural-gas feed is separated into two streams: a bottom one with a high CO2 content and a top product flow rich in CH4. The top product stream from the HP section is split into two streams: the first is heated and expanded to the low-pressure (LP) section; the second one is cooled so that after expansion it is at its bubblepoint at 40 bar. The superheated gas stream is fed at the bottom of the LP section, while the liquid feed enters the column a few theoretical trays above the bottom of the LP section. In the LP distillation section, a top product CH4 gas stream at commercial grade is obtained, while the bottom liquid stream rich in CH4 is pumped back to the HP section to provide the reflux. The condenser is a full-reflux condenser, and the top product stream is obtained as gas. The rationale of the process to avoid solid CO2 formation is the bypassing of the maximum of the SLV locus of the CH4-CO2 system.

Families of univariate and bivariate subdivision schemes originated from quartic B-spline

Families of parameter dependent univariate and bivariate subdivision schemes are presented in this paper. These families are new variants of the Lane-Riesenfeld algorithm. So the subdivision algorithms consist of both refining and smoothing steps. In refining step, we use the quartic B-spline based subdivision schemes. In smoothing step, we average the adjacent points. The bivariate schemes are the non-tensor product version of our univariate schemes. Moreover, for odd and even number of smoothing steps, we get the primal and dual schemes respectively. Higher regularity of the schemes can be achieved by increasing the number of smoothing steps. These schemes can be nicely generalized to contain local shape parameters that allow the user to adjust locally the shape of the limit curve/surface.

Dual CDS scheme embedded in SAR‐based ADCs for low‐noise CMOS imagers without a PGA

A dual correlated double sampling (CDS) scheme, which can be embedded into a successive approximation register (SAR) or SAR/single-slope analogue-to-digital converters (ADCs) for low-noise CMOS imagers without the use of a power-consuming programmable gain amplifier (PGA) is proposed. To reduce the noise of the readout channel, the proposed dual CDS scheme removes the sampling error, which occurs in the capacitor digital-to-analogue converter (DAC), by storing only a reset voltage of the pixel into the capacitor DAC. In addition, without using the PGA, it amplifies the output of the readout channel by controlling the reference voltages of the ADC. The readout channel using the proposed CDS scheme was designed using a 90 nm CMOS imager process technology. The simulation results show that the signal-to-noise-distortion ratio of the readout channel using the proposed dual CDS scheme is 81.8 dB, which is an improvement of 10.8 dB over the digital CDS scheme. In addition, the output of the readout channel is amplified without the use of a PGA.

ICRH physics and technology achievements in JET-ILW

ICRH was extensively used in the 2015-16 JET-ILW (ITER like wall) experimental campaign; bulk heating together with high-Z impurity chase-out from plasma centre importantly contributed to the good DD fusion performance obtained recently in JET. Power up to 6 MW was launched in H-mode deuterium plasmas and 8 MW during the hydrogen campaign. The ILA was re-installed and contributed positively to the availability of ICRH power. The ILA produces slightly less high-Z impurities than the A2's and the PWI measured via Be line emission on limiters is in the same ballpark. Specific experiments were conducted to optimise ICRH scenarios in preparation for DT in particular the dual frequency scheme, (H)D and (He)D were tested. In addition, it was confirmed that the (D)H scenario is accessible in a ILW environment and the novel 3-ions ICRH scheme was validated experimentally.

Optimized Denoising scheme via Opposition based Self-adaptive learning PSO algorithm for Wavelet Based ECG Signal Noise Reduction

Electrocardiogram (ECG) signal is significant to diagnose cardiac arrhythmia among various biological signals. The accurate analysis of noisy electrocardiographic (ECG) signal is a very motivating challenge. According to this automated analysis, the noises present in electrocardiogram signal need to be removed for perfect diagnosis. Numerous investigators have been reported different techniques for denoising the electrocardiographic signal in recent years. In this paper, an efficient scheme for denoising electrocardiogram (ECG) signals is proposed based on a wavelet-based threshold mechanism. This scheme is based on an opposition-based self-adaptive learning particle swarm optimisation (OSLPSO) in dual tree complex wavelet packet scheme, in which the OSLPSO is utilised to for threshold optimisation. Different abnormal and normal electrocardiographic signals are tested to evaluate this approach from MIT/BIH arrhythmia database, by artificially adding white Gaussian noises with variation of 5 dB, 10 dB and 15 dB. Simulation results illustrate that the proposed system has good performance in various noise level and obtains better visual quality compared with other methods.

A modified dual scheme for solving an elastic crack problem

A dual scheme for solving a crack problem in terms of displacements is considered. The dual solution method is based on a modified Lagrange functional. The convergence of the method is investigated under a natural assumption of H1-regularity of the solution to the crack problem. A duality relation for the primal and dual problems is proposed.

A modified dual scheme for solving an elastic crack problem

A modified dual scheme for solving an elastic crack problem

Comprehensive Spectrum Management for Heterogeneous Networks in LTE-U

Recent interesting activities in spectrum analysis have introduced an additional band, the 5 GHz unlicensed spectrum, which has been primarily used for Wi-Fi. There are many challenges related to the coexistence of two different networks, a Wi-Fi network and an LTE network, sharing unlicensed bands but causing interference with each other. In this article, to solve the coexistence challenges, we propose a new protocol for carrier sensing and interference avoidance for heterogeneous networks: carrier sense LTE unlicensed access (CASLUA). The key idea of this protocol is that it listens to the channel by using a Wi-Fi air interface, but actually transmits data via an LTE air interface. This is achieved by using a proposed dual frame aggregation scheme where two frames (an L-frame and a U-frame) are allocated to licensed and unlicensed bands, respectively. Two implementations of CASLUA are carried out, one based on standalone operation (S-CASLUA)and the other operating with assistance from a software-defined network controller (SDN-CASLUA). SDN assistance lies in the monitoring of multiple network parameters, which are then used to make a decision on effective spectrum allocation with awareness of interference and capacity demands. Simulation results show that the CASLUA protocol helps to avoid interference and increases the average throughput by up to 40 percent for both Wi-Fi and LTE users in LTE-Unlicensed.

Dual camera-based split shutter for high-rate and long-distance optical camera communications

Smartphones have been very versatile communication devices. Cameras fitted in smartphones are primarily used to capture photographs and for relevant multimedia functions. Recently, smartphone cameras have been studied for short-range wireless communications. Camera-based optical wireless communication, termed optical camera communication (OCC), is a form of visible light communication. In the OCC, a camera is employed as the receiver, while either a light emitting diode or a liquid crystal display (LCD) is used as the transmitter. This paper proposes a downlink OCC scheme with a dual camera (receiver) and an LCD (transmitter) is employed, using a unique capture method called split shutter method. The split shutter method combined with dual camera offers a significantly increased capture rate as well as increased coverage distance. Experiments were conducted to verify the proposed dual camera-based split shutter OCC scheme. Compared with a standard camera shutter, it is found that the proposed method effectively increases the transmission rate by a factor of two under identical experimental conditions, achieving a maximum of 11,520 bits per second and a distance of up to 2 m using a 1280×720 pixels camera resolution. When compared with conventional rolling shutter OCCs, the proposed method offers four times farther the coverage distance at an identical resolution. It is also demonstrated that the data rate can be further increased when a larger number of transmitters are employed.

Solar photovoltaic fed dual input LED lighting system with constant illumination control

A dual input LED lighting scheme with constant illumination is proposed in this paper. The scheme employs a photovoltaic array as the first input and a battery as the second one. A microcontroller is programmed to operate a changeover switch as well as a DC-DC converter for uninterrupted and constant illumination in work place. The scheme is suitable for conference halls, laboratories, clean rooms, marriage halls, theaters, etc. The complete modeling, design and experimentation of the proposed scheme are explained and the economic viability of the scheme is justified.