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.
In this paper, we present an economic cost analysis, including the capacity analysis subject to deployment cost constraint in the relay-enhanced cellular networks. Based on stochastic geometry analysis of throughput performance, we provide a framework to determine the maximum areal capacity with the given deployment cost, which involves the optimum RS and BS densities. Based upon the throughput analysis,...
This paper proposes a distributed coordination framework with opportunistic scheduling among the multiple users as opposed to the existing works on the multi-cell cooperative beamforming problem subject to a single active user in each cell. This framework deals with the best throughput trade-off between throughput gain by interference nulling, and opportunistic scheduling gain in a cellular MISO system...
We consider a ship ad-hoc network (SANET) that extends the service coverage for data communication with the multi-hop connectivity among the ships. In this paper, we propose two means of transmission rate control to maximize the system throughput subject to the reservation-based random access that is is inherent to the ad-hoc self-organizing TDMA (ASO-TDMA) protocol in SANET. It has been demonstrated...
Stochastic geometry analysis has been adopted to compute the analytical system performance under a scenario of dense relay station deployment for the relay-enhanced cellular network. Our numerical results show that the system throughput can be consistently increased with the larger number of relay stations, especially when the radio resource is properly shared between relay and access links.
The resent observations of neutrino oscillations are conclusive evidence that the neutrino has a non-zero mass, and provides motivation for neutrinoless double beta decay (0ν DBD) searches. Searches for 0ν DBD are challenging experimental approaches aimed at establishing the neutrino's nature (Dirac or Majorana) and absolute mass scale [1–3].
Coordination of the multiple base stations by user and beam scheduling can be considered as a promising means of mitigating the inter-cell interference in future cellular networks. Due to the complexity of joint user and beam scheduling problem, its optimal performance has never been revealed yet. In this paper, we investigate its sub-optimal performance by employing genetic algorithm (GA), which...
We consider the device-to-device (D2D) communication underlaying multi-cell interference system, in which the cellular downlink (DL) resource is reused by K cells and two D2D transmission links within each cell. In this paper, we propose an interference alignment (IA) scheme that can effectively reduce both the inter-cell interference and intra-cell interference. It has been demonstrated that a total...
In this paper, we consider an interference-limited dual-hop relay system, in which the overall system performance is governed not by an additive white Gaussian noise (AWGN), but by co-channel interference (CCI), due to aggressive frequency reuse for high spectrum utilization. We consider that the received signal-to-interference power ratio (SIR) at each hop is affected by large-scale fading (path-loss...
A new type of cold cathode field emission electron source capable of emission at levels comparable to thermal sources is described. The emitter is a unique structure, comprised of a monolithic and rigid porous semiconductor nanostructure with homogenously distributed emission sites, and is fabricated through a room temperature process which allows for control of emission properties. These electron...
In this paper, we present a resource management framework for scalable transmission control, which optimizes resource allocation for scalable video coding (SVC)-based mobile IPTV service. In particular, it includes a scenario without any bandwidth constraint, in which total resource consumption for mobile IPTV service must be minimized so as to support more unicast data traffic with the remaining...
The feasibility condition for interference alignment (IA) with no channel extension has not been known yet. In this paper, for the first time, we explore the feasibility of interference alignment and cancellation (IAC) which has been proposed for IA with no channel extension. We investigate IAC for the Gaussian interference multiple access channel (MAC) with K receivers and J users, each with M antennas...
We designed and developed 50-passenger class WIG craft WSH-500 based on the sea trial data of Fischer-Flugmechanik's two-seater test craft Hoverwing 2 VT. WSH-500 is A-type WIG craft which is certified for operation only in ground effect. Its length is 29m and take-off weight is about 17tons. Target cruising speed is 95knots. This paper deals with the results of the development and the sea trial of...
Nowadays the higher strength steel sheets are desired for weight reduction of the steel structures, typically car. The mechanical properties of steel strip is mainly affected by phases which are determined by contents of the alloy elements and conditions of the rolling process. With given volume fraction of the phases, the mechanical properties are correlated with the micro-structure such as grai...
In this paper, we propose a scalable transmission control (STC) scheme as a new framework of radio resource allocation for mobile IPTV service, especially when scalable video coding (SVC) is used for all programs channels in Mobile WiMAX network. We present a suboptimal solution to the STC problem and demonstrate that the overall service coverage can be significantly improved by the proposed framework...
We present the direct measurement of the gate capacitance of a silicon nanowire field effect transistor using time-domain monitoring of the source current when the gate pulses with various frequencies and amplitudes are applied. The displacement current induced at the gate capacitance is proportional to the derivative of the gate pulse, and it becomes measurable when the rise time of the gate pulse...
In this paper, we consider a cooperative beam-forming problem for MISO interference networks, modeling the downlink capacity that is significantly limited by inter-cell interference (ICI). It is yet a critical issue to improve the performance of cell-edge users who suffer from strong ICI. We propose a cooperative beamforming scheme that combines resource allocation and beam selection to deal with...
As various types of wireless systems are characterized by its own individual reliability and transmission cost in the multi-band maritime communication network, a means of selecting a least-cost system is required for transmitting the shipment information within a pre-specified time constraint. In this paper, a simple decision criterion for a least-cost network selection has been derived with a stochastic...
This study focused on the monitoring method of dry etching chambers using optical emission spectroscopy(OES). A novel normalization method was suggested for the quantitative analysis of plasma emission spectra in dry etching process. The spectral signal was simplified into peaks and valleys, and then the peak intensity was divided with the average intensity of adjacent valleys. The normalized intensity...
In this paper, we consider the BER analysis of the constellation rearrangement (CoRe), which is not subject to the Gray-encoding constraint for the first transmission. This type of CoRe can be applied in a parallel transmission system such as cooperative relaying networks. Furthermore, it allow us to construct the accumulate constellation, which obtained by separating and rearranging the received...
In this paper, we analyze the outage performance of relay-enhanced cellular systems in an interference-limited environment, where the co-channel interference (CCI) is a crucial factor that governs the overall system performance as compared to an AWGN (additive white Gaussian noise). Furthermore, the relay station and destination are subject to the different but arbitrary number of CCIs on each node...
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.