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The US equity exchange market is organized as a National Market System, enforcing price priority across exchanges, but otherwise allowing competition for order flow among exchanges. This flexibility has naturally evolved to a market where exchanges have varying quality and cost of execution. To meet the obligation for best execution, a broker must employ a strategy for selecting the exchange to which...
New generation embedded systems demand high performance, efficiency, and flexibility. Reconfigurable hardware can provide all these features. However, the costly reconfiguration process and the lack of management support have prevented a broader use of these resources. To solve these issues we have developed a scheduler that deals with task-graphs at run-time, steering its execution in the reconfigurable...
A queuing system with dual services, i.e., the primary service and the auxiliary service, is considered in the present article. The server has to allocate part of its capacity to process the additional service when the auxiliary service is requested. We show that the possible optimal auxiliary capacity is actually on the convex envelope of the auxiliary cost function. Also, the optimal control policy...
We develop a framework to study differentiated services when there are competing network providers. We adopt a multi-class queueing model, where providers post prices for various service classes. Traffic is elastic and users are Quality of Service (QoS)-sensitive, and choose a queue and a class with one of the providers. We model the relationship between capacity, QoS and prices offered by service...
Wireless mesh network (WMN) is a promising technology for broadband Internet access due to its low cost, ease of deployment, increased coverage, and robustness. Equipping each mesh router with multiple radios can greatly improve the capacity of WMNs since the radios at each node can simultaneously transmit data on orthogonal channels. Channel assignment is an important problem in multi-radio multi-channel...
In this paper, we present a system that optimally and dynamically allocates the available computing resources to virtual machines that support virtual collaboration environments. Such environments are emerging fast via on-line social networks, virtual worlds, and the "Web 3.0" or "collaborative Web" paradigm. We use a utility-based framework to differentiate the applications hosted...
Implementation of heterogeneous wireless networks is a key issue that needs to be attended for delivering 4G services. The concept of reconfigurable interoperability defines mechanisms for coexistence of the wireless networks and intelligent management and reconfiguration within such systems. This paper elaborates the design of reconfigurable interoperable wireless communication system (RIWCoS). It...
Sub-50 nm CMOS technologies are affected by significant variability which causes power and performance variations among nominally similar cores in MPSoC platforms. This undesired heterogeneity threatens execution predictability and energy efficiency. We propose two techniques to allocate sets of barrier-synchronized tasks (representative of a wide class of image processing workloads) onto variability-affected...
We consider a practical application of intelligent vehicles for intersection traffic control. Specially, we study the intersection traffic control problem using reservation-based intersection traffic control system, which utilizes the information exchange between intelligent vehicles and management agents around the intersections to direct traffic, instead of traffic lights. We focus on how to design...
A (layered) broadcast approach is studied for fading wiretap channels. The basic idea is to employ superposition coding to encode information into a number of layers and use stochastic encoding for each layer to keep the corresponding information secret from an eavesdropper. The legitimate receiver successively decodes information one layer after another by canceling the interference caused by the...
A mission critical environment (MCE) consists of error-prone, highly variable, and highly rate limited communication channels. Paradoxically, this substantially increases the need to perform optimal task allocation (OTA), while at the same time making it much harder to perform OTA efficiently. To simplify the problem, we consider OTA for publish/subscribe-based MCE since it has unique characteristics...
This paper proposes a framework for spectrum sharing between multiple Universal Mobile Telecommunication System (UMTS) operators in the UMTS extension band. An algorithm is proposed, and the performance of the algorithm is investigated under uniform and non-uniform traffic conditions. The impact of call setup messages on the overall performance of the algorithm show that DSA gains in the region of...
As the number of mobile users increases, and cell phones become more powerful, delivering multimedia content to them using a centralized infrastructure becomes both expensive and inadequate. Here we study an alternative solution, which leverages local dedicated caches on these devices to opportunistically fulfill other user requests, in a peer-to-peer manner. The problem we study is that of choosing...
As chip-multiprocessor systems (CMP) have become the predominant topology for leading microprocessors, critical components of the system are now integrated on a single chip. This enables sharing of computation resources that was not previously possible. In addition, the virtualization of these computational resources exposes the system to a mix of diverse and competing workloads. Cache is a resource...
Taking the uplink scheduling technique in 3GPP LTE system into consideration, the two-level buffer state report (BSR) scheme is proposed as a better candidate solution for uplink resource allocation in LTE system and future beyond third-generation system. In the proposed two-level scheme, the second level BSR content is a complement information of the BSR in LTE system which is regarded as the first...
We consider a scenario in which two sources exchange stochastically varying traffic with the aid of a bidirectional relay that may perform network coding over the incoming packets. Each relay use incurs a unit cost, e.g., transmission energy. This cost is shared between the sources when packets from both are transmitted via network coding; if traffic from a single source is sent, the cost is passed...
6LoWPAN is a low-power wireless personal area network and a technique to apply TCP/IP stack to sensor networks. By installing IPv6 stack to the sensor node, the sensor networks have interoperability with the external IPv6 network. To solve the 6LoWPAN's restrictions, IETF working group recently published problems, IPv6 header compression, and routing mechanism requirement documents through their study...
Multi-nexthop routing mechanisms is the key point in network congestion, and the essential question is how to forward packets among multi-nexthop to reach equiponderant forwarding. This paper proposes an equiponderant forwarding strategy in multi-nexthop routing, which forwards the packets according to the actual capability of each node, and resolves the equiponderant forwarding problem of multi-nexthop...
DCUR follows the same procedure as define in Bellman-Ford but uses two vectors, namely least cost and least delay vector. The main drawback of DCUR is its assumption of link costs. It means that the minimum cost path is more often chosen and therefore the load distribution is not fair for the minimum cost paths. In this paper we propose a way to modify the cost and delay metrics dynamically in the...
Dynamic server provisioning is critical to quality-of-service assurance for multi-tier Internet applications. In this paper, we address three important and challenging problems. First, we propose an efficient server provisioning approach on multi-tier clusters based on an end-to-end resource allocation optimization model. It is to minimize the number of servers allocated to the system while the average...
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