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Micro-grid technology is well-suited to power supply of an island. As to micro-grid planning, a critical issue is how to optimize sizes of distributed generation so that reliability and efficiency of power supply can be assured. This paper calculates different costs of equipment, operation, maintenance and replacement for different distributed resource models. Annual meteorological conditions, load...
Security challenges in cloud environments remain largely catastrophic due to the nature of the cloud; complex, heterogeneous, widely accessible over the internet, and virtualised resource sharing. Static and boundary-based conventional security approaches are clearly not effective as the sole countermeasures. Instead, countermeasures need to be intelligent with a high degree of autonomous, self-managing...
A conceptual model for quality assurance of species occurrence observations in citizen science projects is described below. We adopted the notion of trust as an indicator of VGI quality and define the concept of trustworthiness of a VGI record as a function of three main contexts: consistency with habitat, consistency with neighbors, and the reputation of the volunteer. Using fuzzy control system...
With the development of renewable energy in China, the related fields like smart grid develops faster. Microgrid, as the main form of smart grid, its optimized design is the primary problem to construct microgrid. We use off-grid microgrid and on-grid microgrid as the research objects, take economical cost, electricity supply reliability and energy utilization ratio as optimized targets, use GA-PSO...
The paper introduces the problem of building diagnostic models according to knowledge engineering conceptualization and methodology, where the model is a formal and computable symbolic representation of the specific domain knowledge. Diagnostic process is conceptualized as computable inferential reasoning from observable symptoms to unobservable causes. Uncertainty inherent in such reasoning is represented...
This paper introduces a framework for studying resilience of networked systems in the presence of strong network externalities. The framework used in this paper explicitly incorporates costs of connection and the benefits that are received by direct and indirect access to resources. We show that this simple framework is capable of capturing the three key parameters of resilience: Magnitude of Performance...
As conventional tools for assessing and improving the ability of older adults to perform functional tasks that entail executive functions (EF) are limited, there is a need to identify alternate approaches including the use of simulated environments. The objectives of this study were (1) to investigate differences in EF in older and young adults as determined by their performance on the Adapted Four-Item...
In the 5G era, it is expected that various services will be provided on network slices, which are virtualized network resources. Unlike the uniform service level provided in the current Internet, a network slice has to support multiple service levels for various types of services such as IP telephony, Internet-access and IoT/M2M. Because their requirements are quite different. IP telephony and Internet-access...
To increase mobile ad hoc network reliability, virtually decrease the packets loss to zero, and to support multimedia communications multi-route is required. In order to ensure the availability of two routes, node density must be above a certain value. To the best our knowledge, this paper is the first paper that mathematically determines the required node density to ensure the availability of two...
Biometric is a pattern recognition system that automatically identifies people according to their physiologic and behavioral properties. Among the physiologic properties, hand has a special place so that all features of hand like palm lines, inner knuckles, external knuckles and geometry could be used. More recently, the usage of blood vessels pattern in the palm, in addition to the high acceptability,...
PPV (Perturbation Projection Vector) modeling is an unifying theory for the characterization of the general oscillators. However, for the emerging memristor-based oscillators, the existing PPV abstraction method, which is based on the direct PSS/PXF simulation, encounters the convergence problem due to the hidden state. In this paper we propose a reliable PPV abstraction method based on the conversion...
Economic affordability is a crucial factor for repairable systems. Previous work about economic life prediction of systems mainly concerned about cost models, regardless of system structure or components' relationship. In this paper, a new economic life prediction method has been proposed with combination of a maintenance model and an accumulative damage model. The maintenance model is to depict the...
Wireless Sensor Networks (WSNs) equipped with directional communication and sensing devices provide a high level of tunability needed in optimizing their performance in critical applications. Such devices and nodes, however, remain prone to failure when operating in the field. In this paper we formalize a problem, called directional breach path detection reliability (DIR-BPDREL), that quantifies the...
some urban corridors see serious congestion during rush hours, but travel time is still predictable; while others may not suffer from heavy congestion but exhibit high travel time unreliability. The latter case usually makes motorists more frustrated. Moreover, empirical studies show that the level of unreliability varies over time of day. Using the collected travel time and travel speed data, this...
The effectiveness of robot interaction depends on the robot's ability to perform task-relevant actions and on the degree to which it is able to predict the outcomes of these actions. In this paper we argue that the two learning problems - learning actions and learning forward models - must be tightly coupled for each of them to be successful. We present an approach that is able to learn a set of continuous...
The electric power system is one of the most complex engineered systems. It is, thus, a challenge to design a market that is efficient, transparent, and provides the proper incentives to market participants. Existing market models employ constraint relaxations, which enable various constraints to be relaxed (violated) for a high penalty price. This paper examines the practice of allowing transmission...
Recently lots of new technologies are introduced at the distribution level, and the distribution system is facing challenges on technology and management during reforming toward an Active Distribution System. The sustainability evaluation (SE) fits the new era better than the conventional reliability and economic evaluation. In this regard, by reviewing recent works on sustainability evaluation, the...
In real time systems, random caches have been proposed as a way to simplify software timing analysis, by avoiding corner cases usually found in deterministic systems. Using this random approach, one can obtain an application's probabilistic Worst Case Execution Time (pWCET) to be used for timing analysis. As with deterministic systems, technology scaling in cache memories is making transient and permanent...
This paper proposes a kind of 3 degree-of-freedom spatial parallel micromanipulator driven by linear ultrasonic motors, as well as the kinematic and dynamic analysis. The micromanipulator is a parallel mechanism jointed by flexible hinges. It has two fingers and the moving finger is driven by linear ultrasonic motors which possess plenty of advantages such as high displacement resolution, fast response...
The implementation of Management Information Systems (MIS) in educational management and administration is a relatively innovative field which is rapidly evolving because of its high efficiency and effectiveness. There is a relatively small number of research studies reported in the literature evaluating MIS implementations in universities. This case study focuses on the post-implementation evaluation...
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