The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present the two-stage optical phase conjugation (OPC) to compensate both dispersion and Kerr nonlinearities in a long-haul 4×56 Gbit/s RZ-DQPSK DWDM transmission system. The two-stage OPC is realized to reduce the amount of unwanted products that are produced through nonlinear mixing processes in third-order nonlinear media. We have investigated the benefit of the two-stage OPC using highly nonlinear...
In this paper, we revisit multi-party Diffie-Hellman key exchange (DHKE) protocols by using multi-linear mappings and Weil pairings over elliptic curves. We show how to construct a 4-linear Weil pairing and illustrate the approach by examples. Finally, we present several necessary conditions to find a distortion map for a 5-party DHKE protocol.
This paper presents a control strategy for the AC/DC matrix converter (MC) to achieve the constant output current as well as to reduce the input current harmonic distortion under unbalanced input voltages. The Proportional Integral (PI) controller is used to regulate the output current. Meanwhile, in order to suppress the harmonic distortion of input currents, two resonant compensators are employed...
The age of information is a measure of the freshness of continually updated information, which has been studied theoretically for a variety of queueing models. We conduct an experimental evaluation of the age of information in various emulated network settings to see how well the queue models approximate a network for the purpose of age. We use CORE and EMANE to deploy a one-dimensional multi-hop...
Online banking is a substantial service in the enlargement strategy of the modern bank sector. Nevertheless, this service has not been widely used, because of users are still scared of the risks of online transactions. Thus, the in-depth and distinct works of risks in risk awareness are an essential and meaningful assignment for the banking sector. This study investigates the role of perceived risk...
Massive multiple input multiple output (MIMO) has emerged as a promising technology, which utilizes a large number of antennas at base stations (BSs) to significantly improve the spectral efficiency in terms of bits/s/Hz while reducing the radiated signal power. A critical issue with massive MIMO is the costly circuit power consumption, which is proportional to the number of antennas. This paper develops...
A complete overview in recent years, concerned with the classification, control methods, applications and future works for two-wheeled mobile robot (TWMR), is presented. There have been three main types of TWMRs: input coupling, without input coupling and reaction wheel. For the second model (TWMR without input coupling), a variety of control methods have been proposed from the classical method PID...
In this paper, the structure of indirect matrix converter (IMC) is presented and the space vector pulse width modulation method (SVPWM) is analyzed to apply for this converter. The advantage point of IMC is directly connected a load to a three-phase power source using six bidirectional switches and twelve unidirectional switches without using any intermediate energy storage element. IMC stands out...
The work represents a dynamic programming and piecewise linearization based control strategy for a perturbed discrete-time nonlinear system. Firstly, the perturbed discrete-time nonlinear system is linearized at each sampling time. The origin system is approximated by infinite number of the linearized models. Then, the disturbances are estimated under the assumption of slow variations in input and...
We report on a 32-MHz quartz TCXO fully integrated with commercial CMOS electronics and vacuum packaged at wafer level using a low-temperature MEMS-after quartz process. The novel quartz resonator design provides for stress isolation from the CMOS substrate thereby yielding classical AT-cut f/T profiles and low hysteresis which can be compensated to < ± 0.2 ppm over temperature using on-chip third-order...
The miniaturization of resonators for timing applications brings with it new challenges in terms of device optimization. As the device size is reduced, design intolerances lead to more significant differences between modeled and fabricated devices leading to poor performance. In this paper we present a methodology for improving resonator designs. A 32MHz AT-cut quartz thick VHF shear mode resonator...
Quartz MEMS resonators are attractive for use in oscillators for frequency control applications by virtue of their reduced cost, size, weight, and power (CSWaP), combined with the potential for integration with electronics. We present an ultra-miniature, oscillator (1 mm3 total volume) built with a thickness shear mode quartz resonating element integrated with a SiGe BiCMOS sustaining ASIC to achieve...
We propose a model for mobile caching in which the rate of requests for content is dependent on the popularity and the freshness of the information. We model popularity based on the history of requests and freshness based on the age of the content. We consider a discrete time (slotted) system in which new packets arrive at a limited capacity cache at discrete times. We prove that the optimal policy...
Multifunction radars (MFR) have to achieve their capability requirements in an increasingly complex environment, populated with diverse and hostile targets (e.g. low RCS, low speed targets in clutter or high speed, ballistic targets) in saturating scenarios (due to e.g. RF interference or threats). These radar systems are increasingly exploiting active electronically scanned array (AESA) technology...
This paper proposes a new virtual space vector modulation (VSVM) scheme that can eliminate the common-mode voltage (CMV) for three-level neutral-point clamped (NPC) inverters with balanced neutral-point voltage. The proposed VSVM scheme is based on the virtual space vector concept, which constructs the virtual vectors from the original medium vectors to achieve zero CMV. Moreover, the neutral-point...
This paper presents a 3D microfluidic perfusion cell culture system to mimic microenvironments. The perfusion system is integrated with bubble trapping reservoir, linear concentration generator and meandered microchannel mixer. The sudden expansion reservoir to prevent incoming of air bubbles by using buoyancy is examined. Also, for high throughput screening, the linear concentration gradient generator...
Energy harvesting (EH) is considered to be the key enabling technology for the mass deployment of wireless sensor networks (WSNs) for Internet of Things (IoT) applications. Efficient EH techniques could remove the needs of frequent energy source replacement, thus offering a near perpetual network operating environment. Advances in EH techniques have shifted the design of routing protocols for EH-WSN...
In this paper, we present an analytical framework for detecting optical unipolar orthogonal frequency-division multiplexing (U-OFDM) signals. We derive analytical expressions for time-domain signal estimates based on different schemes including maximum likelihood, maximum a-posteriori and minimum mean-square error (MMSE) estimation. These schemes are compared with state-of-the-art U-OFDM detection...
We verify the validity of the recently suggested universal superstatistical model for the modeling of the aggregated local network traffic. The empirical data set consists of 14 complete daily traffic logs obtained at the link between the Internet Service Provider (ISP) and the local subnet comprising part of the campus network of Ivanovo State University. We show explicitly that the superstatistical...
For time critical updates, it is desirable to maintain the freshness of the received information. We address the impact of hostile interference on information freshness by formulating a non-zero-sum two-player game, in which one player is the transmitter aiming to maintain the freshness of the information updates it sends to its receiver, and the other player is the interferer aiming to prevent this...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.