Abstract. By adopting the fuzzy control theory, a greenhouse irrigation automatic control system has been designed with the characteristic of accurate of the nonlinear, time-variability, long time delay and the characteristic of accurate mathematic model being hard to establish. Through some basic experiments, the basic domain of input and output of the fuzzy controller were ascertained. Time v...

Network coding, where relay nodes combine the information received from multiple links rather than simply replicating and forwarding the received packets, has shown the promise of significantly improving system performance. In very recent works, multiple researchers have presented methods for increasing system throughput by employing network coding inspired methods to mix packets at the physica...

This paper presents optimal coordination of overcurrent relays by using artificial bees colony algorithm. The objective function of the relay coordination problem is to minimize the operation time of associated relays in the systems. The control variables used in this paper are the pickup current and time dial setting of relays. The proposed method was tested with four systems study consists 5-...

Relay feedback has a large variety of applications in control engineering. Several interesting phenomena occur in simple relay systems. In this paper, scalar linear systems with relay feedback are analyzed. It is shown that a limit cycle where part of the limit cycle consists of fast relay switchings can occur. This chattering is analyzed in detail and conditions for approximating it by a slidi...

L2TP Active Discovery Relay for PPPoE describes a method to relay Active Discovery and Service Selection functionality from PPPoE over the reliable control channel within L2TP. Two new L2TP control message types and associated PPPoE-specific Attribute Value Pairs (AVPs) for L2TP are defined. This relay mechanism provides enhanced integration of a specific feature in the PPPoE tunneling protocol...

For the distance protection applied in converter-interfaced renewable energy systems, various AC fault ride-through strategies of sources will cause a large phase difference between operating current relay and current, resulting mal-operation relay. To overcome this issue, paper proposes an active control for systems to enhance reliability This scheme firstly calculates by only using local meas...

In this paper the problem of flow control in fast, connection oriented communication networks supporting traffic generated by multiple sources is considered. The network is modelled as a dynamic system with different delay times. A nonlinear strategy governing the behaviour of the sources is proposed. The strategy combines Smith principle and feed-forward compensation with the conventional rela...

The paper presents a scheme for obtaining a linear-feedback law for a linear system as a result of minimizing a quadratic-performance index; the resulting closed-loop system has the property that all its poles lie in a halfplane Re (s) < -a, where a >0 may be chosen by the designer. The advantages of this arrangement over conventional optimal design are considered. In particular, it is shown th...

In order to improve the Voice over IP (VoIP) capacity of a Wireless Local Area Network (WLAN), we develop a relay-aided solution, which includes a relay-aided admission control scheme, a packet aggregation scheme, and a protocol for packet relay without sacrificing the voice quality. Basically, our admission control scheme utilizes relay stations to admit as many VoIP sessions as possible. When...