It is expected that the proportional fair (PF) scheduler will be used widely in cdma2000 1xEV-DO systems because it maximizes the sum of each user’s utility, which is given by the logarithm of its average throughput. In this paper, we address an influence of the PF scheduler on the packet transmission delay in base station (BS) and propose an analytic model.

The proportional differentiation model is a newly introduced approach for differentiated services networks. This paper proposes and evaluates a scheduling mechanism for the combined control of delay and throughput metrics, according to the proportional differentiation model. The scheme is based on the well known Little’s Law. A moving window averaging mechanism and an active queue management sc...

As an important differentiated service model, proportional delay differentiation (PDD) aims to maintain the queuing delay ratio between different classes of requests or packets according to pre-specified parameters. This paper considers providing PDD service in web application servers through feedback control-based database connection management. To achieve this goal, an approximate linear time...

In this paper, we consider an optimal mean-variance investment and reinsurance problem with delay Common Shock Dependence. An insurer can control the claim risk by purchasing proportional reinsurance. He/she invests his/her wealth on a risk-free asset risky asset, which follows jump-diffusion process. By introducing capital flow related to historical performance of insurer, process described st...

Rate allocation has become a demanding task in data networks as diversity in users and traffics proliferate. Most commonly used algorithm in end hosts is TCP. This is a loss based scheme therefore it exhibits oscillatory behavior which reduces network performance. Moreover, since the price for all sessions is based on the aggregate throughput, losses that are caused by TCP affect other sessions...

This article proposes a method to compute the maximum allowable delay time (  ) for linear-timeinvariant-time-delayed-systems (LTI-TDS) with state-PID feedback control. It presents the main theorem with corollary, and computing steps to obtain .  Stability of a LTI-TDS with stateproportional integral derivative (PID) feedback is ensured if the delay time is less than .  The proposed approach...

Supporting Quality of Service (QoS) over the Internet is a very important issue and many mechanisms have been already devised or are under way towards achieving this goal. One of the most important approaches is the so called Differentiated Services (DiffServ) architecture, which provides a scalable mechanism for QoS support in a TCP/IP network. The main concept underlying DiffServ is the aggre...

Many routing 1 protocols have been proposed for wireless sensor networks. The majority of these protocols considered energy efficiency as the main objective and assumed data traffic with unconstrained delivery requirements. But the introduction of image and video sensors demand certain quality of services (QoS) from the routing protocols and underlying networks. Managing such real-time data req...

Tiger beetles are fast diurnal predators capable of chasing prey under closed-loop visual guidance. We investigated this control system using statistical analyses of high-speed digital recordings of beetles chasing a moving prey dummy in a laboratory arena. Correlation analyses reveal that the beetle uses a proportional control law in which the angular position of the prey relative to the beetl...

In many industrial processes, the first order plus time delay (FOPDT) is still being widely used. FOPDT systems are also called “KLT systems (gain, delay, and time constant).” Considering uncertainties in the time delay, this paper attempts to answer this research question: “Will a fractional order controller help and do better?” In this paper, we first focus on fractional order proportional an...