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Quality of Service (QoS) differentiation measurement provides the ability to evaluate different level of QoS support in 4G networks such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Many research studies around the world have addressed the QoS Differentiation (QoS-Diff) considerations, however, to the best of our knowledge, only a few have attempted to...
In this study, we test anomaly based Denial of Service (DoS) detection approaches on networks with different utilization profiles. In the experiments, we use operational background traffic and performed Distributed DoS attackswithout disturbing the operational network. Experiment results indicate that the detection approach's detection performance is inversely proportional to network utilization and...
MEMS Gyroscope mathematical model is needed while an electric-optical control system is designed, because MEMS gyroscope is used as angular rate component and its error is also added into the servo loop. To compose the mathematical model, three parameters, damping ratio, scale factor and natural frequency are identified. First a gyroscope mathematical model is presented. Second a MEMS gyroscope is...
Frequency reuse schemes are an interference management techniques well suited to OFDMA-based cellular networks. In this paper, analytical expressions are derived for the worst case Signal to Interference Ratio (SIR) ratio for both Fractional Frequency Reuse (FFR), and Soft Frequency Reuse (SFR). Also, analytical expressions are derived for the best inner radius using the worst SIR in both FFR, and...
A low-noise transimpedance amplifier (TIA) for 2.5 Gb/s family is presented using 0.35 μπι BiCMOS technology. It would be used in radiation detectors to transform the current pulse produced by a photo-sensitive device into an output voltage pulse with a specified amplitude and shape. In this paper the mathematical analysis of the proposed TIA is presented together with a detailed analytical noise...
This paper presents a circuit analysis of electromagnetic band gap structures (EBG). Microwave transmission line theory is used to accurately analyze EBG structures. The results of this analysis are compared with previously published results, including more time-intensive full-wave analysis result, and this analysis is validated. The analysis applies to any type of EBG structure, including conventional...
Providing optimal Quality of Service (QoS) for Cloud Services Delivery Networks (CSDN) is a challenging task due to the mutual-interference phenomenon among multiple applications. Existing approaches only provide best-effort services, which aim to maximize the number of served users and sacrifice service dependability. To enhance the service dependability, designs of allocating fixed bandwidth among...
Saturation of femtosecond vibrational Raman coherence and coherent anti-Stokes Raman scattering (CARS) signal in air show drastically different characteristic compared to nanosecond regime. Rotational Raman saturation is shown to dictate the behavior of vibrational Raman.
The paper introduces a new method of reconstruction of varying bandwidth signal sampled at sub-Nyquist rate. The temporal bandwidth is estimated dynamically by sampling the signal at its local extrema. The extremum sampling, which produces samples irregularly in time, provides at once the samples of the signal and its first derivative, since the local extrema occur at zero-crossings of the first time-derivative...
We give a generic divide-and-conquer approach for constructing collusion-resistant probabilistic dynamic traitor tracing schemes with larger alphabets from schemes with smaller alphabets. This construction offers a linear tradeoff between the alphabet size and the codelength. In particular, we show that applying our results to the binary dynamic Tardos scheme of Laarhoven et al. leads to schemes that...
Sustaining the memory locality is critical for obtaining high performance in NUMA system. But how to identify a locality leakage problem and how to measure the leakage is still open issue. This paper provides an algorithm to quantitatively measure the locality leakage based on the memory trace produced by IBS (Instruction-Based-Sampling). A """"perfect matrix""""...
In this paper, we present an improved low voltage current mirror with enhanced bandwidth. The bandwidth enhancement is obtained by using a compensation resistor between the gates of the primary transistor pair. In this technique, a carefully determined resistance is used in the diode connected MOSFET of the current mirror for enhancing the bandwidth. Active realization of the compensation resistance...
Energy-efficient computing is becoming more important with the latest technology improvements. State-of-the-art dynamic voltage/frequency scaling (DVFS) policies manage resources' voltage and frequency to achieve higher energy efficiency. A DVFS policy manages a single resource by continuously evaluating its utilization. We propose a new integrated DVFS policy that manages both CPU and memory. The...
A design procedure for fourth and sixth order ultra-wide band filter using step impedance resonators (SIR) is presented in this paper. SIR provides wide degree of freedom in structures and capable of handling wide frequency band. Due to these features and its simpler structure, it gives many possibilities for practical applications. In this paper, transfer function is extracted from equivalent circuit...
Network Virtualization has been proposed as new promising resource management approach that allows multiple customized Virtual Networks (VNs) to be setup on a shared physical infrastructure. In this paper, our focus is on the embedding problem which consists on the mapping of VN resources onto physical infrastructure network. Since this problem is known to be NP-hard, in literature, number of works...
The IEEE 802.11 Distributed Coordination Function (DCF) does not require the presence of a central controller or access point. It is therefore, the standard protocol used for resolving medium access contention in mobile ad hoc networks. IEEE 802.11 DCF is based on carrier sense multiple access with collision avoidance and Binary Exponential Back off Algorithm (BEBA). BEBA can improve the system throughput...
Over the years of the emergence of peer-to-peer systems a phenomenon named 'Free Riding' has affected its performance and become a serious threat to be resolved. Free riding phenomenon was first felt in the study of Gnutella. As the number of free riders increases, the performance of the overall system decreases as free riders use resources without giving anything to the system. To solve the problem...
In recent years, there has been an increasing interest in P2P (Peer-to-Peer) streaming environments. There are various types of streaming contents. One of them is a content that can be separated into model and motion data like CG animations. The interruption times that occur during playing the data can be reduced by considering the time to start playing each type of data. However, previous researches...
In this paper, we analyze the performance of time delay estimation with regards to different pulse shape in UWB indoor navigation. For the performance of time delay estimation, the Cramer-Rao Lower Bound (CRLB) criterion is used and the performance is analyzed under various criteria of pulse shape, such as pulse period, order of differentiation, and the effective pulse width. Moreover, the reasonability...
During the design phase of avionics systems, the activity of selecting the physical components of an IMA platform and allocating the avionics system's applications into the chosen components may lead to several options to configure the given IMA architecture. The aeronautical industry already realized that this activity can be assisted by automated methods. Focusing on the communication allocation,...
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