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Intermixing processes in quantum wells have been extensively studied in order to modify characteristic of semiconductor devices such as LEDs. Controlling the band gap of material by introducing intermixing process can be used to enable broadband and controllable emission of LEDs. Quantum well intermixing (QWI) in InGaN/GaN double quantum well (DQW) is discussed in this paper. By varying the interdiffusion...
Based on relaxation equations of energy balance, momentum and occupation of valleys was modelling the transitional effect „overshoot” of drift velocity in threenitrids osn the example of aluminium nitride, gallium nitride, indium nitride. The possibility of multiple exceeding over the stationary values.
In the growth of AlGaInAs/InP material system by metal organic vapor phase epitaxy (MOVPE), there are many hillocks on the wafer in some growth conditions. We analyzed the hillocks by TEM and EDX and found that the origin of the hillocks is InAs dots on growth interrupted interface. In addition, we investigated the growth condition dependence of hillock distribution in details, and revealed the origin...
The GCMOSFET device is used as IR medium region (1.5 μm-6.0 μm) detector. This can be done by using Indium as dopant in the GCMOSFET device. GCMOSFET gives significantly higher drive current than MOSFET: therefore, GCMOSFET needs lower power consumption. This can be achieved because GCMOSFET has shorter effective channel length than MOSFET.
The current RTP/RTCP [1] standard is not optimal for deployment in large-scale sessions with a single source. As the IPTV market is expected to be growing in the coming years, many universities and research laboratories are involved in optimizing for this couple of protocols. One of the most promising technologies for such purposes seems to be the Hierarchical Aggregation (HA). It optimizes transmitting...
In this paper, we analyze a discrete-time priority queue with session-based arrivals. We consider a user population, where each user can start and end sessions. Sessions belong to one of two classes and generate a variable number of fixed-length packets which arrive to the queue at the rate of one packet per slot. The lengths of the sessions are generally distributed. Packets of the first class have...
We propose a transport-layer approach to provide predictable throughput for applications requiring stable bandwidth resource, such as video streaming and VoIP. The proposed mechanism deploys an end-to-end approach: it dynamically sets the increase degree of the congestion window size of a TCP connection according to the measurement results of the available bandwidth of the network path, which is obtained...
Data broadcasting is independent of client arrival rate, and thus it is very suitable to transmit popular videos that interest many clients at a particular period of time. One broadcasting method (called periodic broadcasting) is to partition a video into segments, which are then simultaneously broadcast on several data channels. Once clients want to watch the video, they download the segments from...
Data stream has attracted many researchers from various communities (network, database and data mining). There are a variety of techniques for solving the similarity matching in time series datasets. However, subsequence matching over data stream, finding those subsequences which are similar to a query sequence in a progressive and real-time fashion, is a challenging and novel problem due to the high...
In recent time we spot a tendency to use the computing capacity of workstation clusters instead of investing in single machines with tremendous calculation power. Applying this idea we are able to execute multiple jobs paralelly. However, it still remains unclear how to schedule given jobs among available machines most effectively. Therefore this paper is an approach to optimization of mentioned scheduling...
We introduce a new downward compatible routing protocol called Routing Information Protocol with Minimal Topology Information (RIP-MTI) which is based on the simple Routing Information Protocol (RIP). We exploit the distance vector updates more thoroughly than common RIP-protocols, and therefore, need not alter the interactive behavior of the Routing Information Protocol. With this approach, we are...
A wireless sensor network consists of a large quantity of small, low-cost sensor nodes that are limited in terms of memory, available energy and processing capacity. Generally, these sensor nodes are distributed in space to obtain physical parameters such as temperature, humidity, vibration or light conditions, and transmit the measured values to a central entity. The measurements are tagged with...
In this contribution an analysis of MultiCarrier Modulation (MCM) is realized. The features of Discrete MultiTone modulation (DMT), Orthogonal Frequency Division Multiplexing (OFDM) and alternative modulation based on filter bank - Filtered MultiTone (FMT) will be mentioned. Based on this study the half sub-channel overlapped Filtered MultiTone Modulation will be introduced.
Among the metric space indexing methods, AESA is known to produce the lowest query costs in terms of the number of distance computations. However, its quadratic construction cost and space consumption makes it in feasible for large datasets. There have been some work on reducing the space requirements of AESA. Instead of keeping all the distances between objects, LAESA appoints a subset of the database...
Trees in 3D interactive applications began mostly as textured billboards, scaled semi- transparent pictures that spun around their vertical axis to face the viewer. Those situations where vegetation began to play a stronger foreground role required higher fidelity, and simple geometric structures emerged. Although initially rudimentary and sometimes combined with textured subshapes, these new forms...
We consider the problem of finding a lower bound on the minimum mean-squared error in a Bayesian estimation problem. The bound of Young and Westerberg, which is based on determining the optimal bias function, is extended to the case of a vector parameter. A numerical study demonstrates that the bound is both tighter and simpler to compute than alternative techniques.
The design of sensor networks capable of reaching a consensus on a globally optimal decision test, without the need for a fusion center, is a problem that has received considerable attention in the last years. Many consensus algorithms have been proposed, with convergence conditions depending on the graph describing the interaction among the nodes. In most works, the graph is undirected and there...
The classical problem discussed in the literature of compressed sensing is recovering a sparse vector from a relatively small number of linear non-adaptive projections. In this paper, we study the recovery of a continuous set of sparse vectors sharing a common set of locations of their non-zero entries. This model includes the classical sparse representation problem, and also its known extensions...
A simple graphical method (P. Kundur, 1993) could be used to obtain the appropriate shape and the correct complex plane location of the OOS polygons at locations where the swing traces a classical locus. The swing locus could, however, be greatly non-classical at certain locations in networks that have shunts (i.e. loads, voltage regulating shunts, etc) [1]. At locations where the swing locus is greatly...
The capacitor-commutated converter (CCC) has frequently been used in the conception of HVDC systems connected to busbars with low short circuit level. This alternative arrangement, in substitution to the conventional ones, guarantees less sensitive operational conditions to problems related with the commutation failure in the inverters besides supplying part of the reactive energy to be compensated...
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