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Wireless LANs carry a mixture of traffic, with different delay and throughput requirements. The usual way to provide low-delay services is to give priority to such traffic. However, this creates an incentive for throughput sensitive traffic also to use this service, which degrades overall network performance. We show, analytically and by simulation, that the performance of both delay and throughput...
In this paper, we present a scalable implementation of a topic modeling (Adaptive Link-IPLSA) based method for online event analysis, which summarize the gist of massive amount of changing tweets and enable users to explore the temporal trends in topics. This model also can simultaneously maintain the continuity of the latent semantics to better capture the time line development of events. With the...
Hardware in the Loop Simulation(HILS) plays an increasingly important role in the development and test system of missile. This paper describes the structure and function of a typical HILS Platform for missile testing. The platform has a double computers structure, which consists of the control computer and the simulation computer. The paper analyses the hardware and software requirements and gives...
This paper presents the model splitting method for large-scale interactive network simulation, which addresses the separation of concerns between network researchers, who focus on developing complex network models and conducting large-scale network experiments, and simulator developers, who are concerned with developing efficient simulation engines to achieve the best performance on parallel platforms...
With the constantly growing number of multimedia devices, images can now be viewed on a broad range of display of tremendously varying size. However, perceiving all the details of a multimedia content is difficult on smaller mobile devices. To solve this problem, saliency based image re-targeting algorithms have been proposed in order to generate more perceptually efficient thumbnails. In this article,...
Traffic jam is a major problem in Bangkok and nearby provinces in Thailand. Currently, there have been several attempts to solve this elevating problem by using GPS together with GPRS technologies in tracking and collecting traffic data from vehicles. In this work, we obtained one-month records of GPS data from 297 volunteered vehicles. Using vehicles' velocity as input, we have developed a travel...
To make real-time marketing tools for online storefronts, it is necessary to understand intentions of customers who are connecting on the storefronts. One of important customer intention may be whether a customer intends to purchase or not in the current session. In this paper, we propose customer purchase probability prediction method based on clickstream data using association rule generation techniques...
Companies with established and reliable control systems are often confronted with the question of how to benefit from upcoming innovations in science and practice without removing or extensively changing their systems. One of the currently often discussed innovations is the new standard OPC Unified Architecture (OPC UA). OPC UA provides an improved data transport and a semantically rich information...
Real-time reliability assessment methods make it possible to asset system reliability on-line, which promote the development of the reliability research. A new method of real-time reliability assessment based on support vector regression (SVR) and Bayes is put forward in this paper. Firstly, principles of SVR and Bayes methods are particularly introduced, and then a model of real-time reliability...
In e-Science, many scientific workflow management systems have been developed to integrate distributed computation resources, data sets, and mining algorithms. Users usually modify and rerun a workflow while repeating procedures: preprocess of data, selection of features, modification of data, selection of mining algorithms, generation of models, and evaluation of the models. These procedures are...
System health diagnostics provides diversified benefits such as improved safety, improved reliability and reduced costs for the operation and maintenance of engineered systems. Successful health diagnostics requires the knowledge of system failures. However, with an increasing complexity it is extraordinarily difficult to have a well-tested system so that all potential faulty states can be realized...
This paper discusses the necessity and main methods of developing the three-dimensional visual and interactive system. Then the method of combining OpenGL and 3DS MAX is chosen to build the system. System structure, data transmission and interaction were presented with UML. The realization of dynamic model, viewpoint control, real-time display and vanish and other techniques are studied to ensure...
The impact of integrating large-scale solar photovoltaic (PV) generation on the balancing requirements in terms of regulation and load-following requirements in the southern Nevada balancing area is evaluated. The “swinging door” algorithm and the “probability box” method developed by Pacific Northwest National Laboratory (PNNL) were used to quantify the impact of large PV generation on the balancing...
A model has been developed that links electric power load demands to power generation pollutant emissions using data available to the general public. The relationship between generation costs and generation types is developed first using real-time fuel cost data. The locational marginal price (LMP) at any bus in the system is then used to determine the generating unit type that is “marginal” at any...
We propose an autonomous state estimation based on robotic concepts and advanced state estimation methods. An autonomous, intelligent monitoring infrastructure is proposed that reliably and automatically detects devices as they are plugged-in or -out; it identifies changes in system state and automatically updates the real-time model of the system. The real-time model is used for control, operation,...
To provide the real-time application environment in the laboratory for the research of on-line analysis and control applications in EMS system, a simulation platform used for system-level closed-loop control experiment is proposed and realized based on RTDS and EMS in this paper. A protocol converter and a real-time data storage control generator are developed independently. Through the RTDS-GTNET...
GPS is an ideal well known policy designed to share the capacity of a server between the input flows: each flow receives a fractional part, defined by the administrator, of the total server capacity1. It has several practical implementations, like P-GPS. These policies have been defined in the context of a constant-rate server. In this paper, a generalisation of GPS and P-GPS is proposed, in network...
As NextGen concepts move toward increasing en route and terminal throughput, wake turbulence separation may become a limiting factor in the pursuit of capacity improvements. Better knowledge of the probable location of wakes (for air traffic controllers as well as pilots) could help provide safe separation from wake turbulence while avoiding unnecessary restrictions to operations. The Wake Turbulence...
Model driven development (MDD) is on the rise in software engineering and no more so than in the realm of realtime and embedded systems. Being able to leverage the code generation and validation techniques made available through MDD is worth exploring, and is a large area of focus in academic and industrial research. However given the iterative nature of MDD, the evolution of models causes test case...
Performance and time to market requirements cause many real-time designers to consider components, off the shelf (COTS) for real-time cyber-physical systems. Massive multi-core embedded processors with network-on-chip (NoC) designs to facilitate core-to-core communication are becoming common in COTS. These architectures benefit real-time scheduling, but they also pose predictability challenges. In...
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