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Avionics Full Duplex Switched Ethernet (AFDX) network is an emerging Ethernet media based technology for the next generation avionic data bus. One of the key issues in AFDX networks is to guarantee the data transmission delay and optimize the worst case end-to-end delay performance in order to meet the requirements of safety-critical applications, such as flight control. In this paper, a more accurate...
Cloud computing is a consolidation environment that hosts heterogeneous applications. Currently, clouds use virtualization technologies to provide an isolated execution environment and agile resource provisioning. Furthermore, live migration is widely exploited to achieve energy saving. However, consolidation and live migration can cause resource contention and utilization overhead that influence...
The purpose of this paper is to present performance characteristics of a quick response digital peak-current-mode 380V dc-dc converter for the green IT system. A proto-type is constructed as the digital control dc-dc converter used in the higher voltage direct current (HVDC) system for the green IT. The proto-type uses the digital peak-current-mode control to show a superior transient response. A...
The purpose of this paper is to present a transient response of proposed quick response peak current control dc-dc converter. In the proposed method, the peak current is able to be detected in real time by using voltage controlled oscillator (VCO) which is very low cost and a high speed A-D converter. The proposed circuit generates the turn off signal of the main switch. In simulated results, the...
Avionics Full DupleX (AFDX) Switched Ethernet technology provides a deterministic network to avionics context. Guarantees on worst-case end-to-end (ETE) communication delays are required for certification purposes. This paper identifies the worst-case ETE analysis as an optimization problem and proposes a mathematical programming approach to calculate an exact worst-case delay and the corresponding...
To alleviate the growing concern of energy waste in networked devices, we propose an energy saving strategy in the ``server-centric" data center network. Focusing on servers, we introduce a basic scheme based on the transition of automata. By changing efficiently from sleeping state to active state in different network traffic, servers save the energy. This scheme is self-adaptive and simple...
Live streaming distribution services have spread as one of the most popular services. The technique of creating contents has been developed, and users can use it easily. Accordingly, the number of contents rapidly increased. In the existing content distribution system, users must select an interesting content from a large amount of contents in the Internet. It takes long time to find out the most...
Cognitive Radio Networks have been designed to increase spectrum utilization by utilizing temporarily unused spectrum bands in the primary user's licensed spectrum by secondary (unlicensed) users. In general, when a primary user appears in a band occupied by a secondary user, the secondary user will temporarily cease its transmission and change the operating channel. Unfortunately, successive spectrum...
A novel wideband bandpass filter (BPF) using open-stub and short-stub loaded multi-mode ring resonator (MMRR) is proposed in this paper. The characteristics of the multi-mode resonator are investigated using even-odd mode analysis. The odd-mode resonance frequency is mainly determined by the length of ring resonator, while the even-mode frequencies can be tuned effectively by changing the lengths...
The stability analysis of network control systems still poses a challenge due to the nonlinear behavior induced by network transmissions. The current paper addresses the stability problem for a network control system which includes a nonlinear network transmission model. The network transmission model embeds the main characteristics of real TCP/IP network transmissions like time varying delays, packet...
In this work we focus on the study of limit cycles that appear on an Integrator Process with Time Delay (IPD) controlled by a PI when the feedback is done with an event-based paradigm. We use a level crossing sampling which can be characterized as a non-linearity of n levels with hysteresis, and possibly with saturation. We also study the differences between placing the sampler after the process output...
Multipath transmission is the important way to increase the efficiency and reliability of network transmission. Along with the development of overlay network, multi-homed host et al, multipath transmission control becomes the hot spot of network transmission technology research gradually. As the base of path choice and switching in multipath transmission, real-time evaluation of path QoS is a key...
This paper presents a new type observer design by using only the sampled delayed measurements where the delay value is different of the sampling period. This proposed piecewise continuous observer, called Piecewise Continuous Systems and derived by using the theory of a particular hybrid systems characterized by autonomous switchings and controlled impulses, has a very simple structure and can be...
This paper presents a Proportional Derivative (PD) controller with gain-scheduling depending on the distance for haptic interfaces and virtual environments subject to communication delays. It is well known that the presence of delays deteriorates the overall system performance. More precisely, depending on the proposed architecture as, for example, bilateral position-position coupling, time-delays...
The use of beamforming antennas has received significant attention over the last decade. We consider beamforming applied to dynamic operations such as networked UAV hubs which interconnect with users on the ground. The key problem involves scheduling these communications with users serviced by different beam patterns. This paper develops a linear program to optimally allocate time to beams for client...
Instead of applying physical techniques to prevent crosstalk on off-chip parallel data buses, another approach is to code the sent information, [1]. Through developing of a crosstalk avoidance code (CAC) is possible to create a forbidden transition channel (FTC) that prevents transitions responsible for generating crosstalk, [2]. Rules used in developing a CAC can be very complex, and because of that...
To properly operate closed industrial control networks, it is required that communication with nearly constant delay bounds be supported. In [9] the authors introduced FlexTDMA in order to provide this support, and with minimal delay-jitter in an asynchronous network, under unicast communication. In this paper we consider how periodic on-off traffic and frame loss are managed in the presence of network...
The core idea of cognitive radio technology is to realize the dynamic spectrum allocation and spectrum sharing through spectrum sensing and system learning. This paper sets the throughput and delays as the algorithm design target, puts forward a cognitive radio multi-channel routing algorithm based on a modified PCNN (MPCNN), which fully considered the multi-channel characteristic, through both the...
This paper addresses the NP-hard problem of switching off bundled links whilst retaining the QoS provided to existing applications. We propose a fast heuristic, called Multiple Paths by Shortest Path First (MSPF), and evaluated its performance against two state-of-the-art techniques: GreenTE, and FGH. MSPF improves the energy saving on average by 5% as compared to GreenTE with only 1% CPU time. While...
This paper presents a fast response digitally controlled full bridge converter in parallel operation. The digital controlled circuit has some problem. One of the main problems is the delay time. The delay time includes the conversion time of A-D converter and processing time of digital controller. It exerts a bad influence on the dynamic characteristic. In the proposed method, the sample timing for...
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