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High schools have rapidly adapted computers in their administration, management and academy. School management uses papers and computers as tools to store the administrative and management data. However computers are not used to analyze data and output information. Therefore, e-School Management System (e-SMS) is developed to facilitate teaching and administration staffs to manage school activities...
This paper considers a selective maintenance policy for multi-component systems for which a minimum level of reliability is required for each mission. Such systems need to be maintained between consecutive missions. The proposed strategy aims at selecting the components to be maintained (renewed or submitted to imperfect preventive maintenance) after the completion of each mission such that a required...
The consumers in a wireless grid will prefer reliable and cost optimal resources for job execution, while the grid service providers prefer efficient utilization of their resources. Hence brokering of resources that meet the requirements of consumers and providers is a challenging task in presence of unstable (wireless) network connections, market dynamics and rational users. This paper models a resource...
Pedagogically, feedback in CAPT systems can be improved by focusing on the most critical errors rather than presenting all errors to the users at the same time. This paper presents our work on the use of crowdsourcing for collection of gradations of word-level mispronunciations in non-native English speech. Quality control procedures based on the proposed WorkerRank algorithm (adapted from well-known...
We present the results of a simulation to assess the optimal design characteristics of rainwater harvesting systems to be used in a semi-arid region of the United States. The simulation leverages a stochastic, non-parametric rainfall generator based on 64-years of daily historical data. The assumption of non-stationarity of rainfall is also thoroughly investigated for this paper. Of specific interest...
This paper presents an efficient combinatorial approach to compute the reliability of Folded Crossed cube topology. The reliability measure has been defined as Task-based Reliability (TBR).The model is based on decomposition principle which is entirely task-based and can handle any degradation. The reliability results are obtained using recursive equation both optimistic and pessimistic are better...
In this paper we study the feasibility of IEEE 802.11ah radio technology for internet of things (IoT) and machine to machine (M2M) use cases. Devices in internet of things and machine to machine networks are foreseen to communicate wirelessly. Therefore, it is of foremost importance to have a reliable, low-energy wireless technology available that may be used anywhere and anytime without draining...
This paper deals with a reliability optimization problem for a series system with multiple-choice and budget constraints. Choosing one technology for each subsystem and for maximizing the reliability of the whole system subject to the available budget, the optimization criteria are in used. We develop an efficient genetic algorithm hybridized with a local search step to solve the problem. In the approach,...
Current trends in information technology emphasize the need of flexible systems that are able to adapt to their changing environment. The aim of this paper is to develop an infrastructure for architecture level self-adaptation, and to study its applicability in the case of distributed systems. The approach is based on dynamically inserted and removed design solutions. The built infrastructure provides...
This paper proposes an approach to evaluate user satisfaction of adaptation in service-based business processes execution. First, Withdrawal business spanning graph is introduced to achieve adaptation of service-based business processes at run-time. Second, a set of well-defined Quality of Service (QoS) criteria is used to evaluate user satisfaction. Finally, three simulation examples of adaptation...
Wireless sensor networks (WSN) are being used in a wide range of application areas, such as national security, attack and disaster preparation and response, military surveillance, and medical care. All these applications require a certain level of reliability and security during data transmission. Data loss or corruption in WSN may be due to hardware failures, wireless channel noises, or malicious...
In this paper, we present a new tri-criteria scheduling heuristic for scheduling data-flow graphs of operations onto parallel heterogeneous architectures according to three criteria: first the minimization of the schedule length crucial for real-time systems, second the maximization of the system reliability crucial for dependable systems, and third minimizing energy consumption crucial for autonomous...
The study of the women's competitive gymnastics, picking out 60 young women whose bodies are close to the physiological index of competitive gymnastics athletes to try on. Using the methods of the subjective and objective experiments, the paper makes a research into pressure comfort when people try on seamless gymnastics clothing in the stillness and movement conditions. Applying the parameter interval...
One of the most powerful ways to achieve transmission reliability over wireless links is to employ efficient coding techniques. This paper investigates the performance of a transmission over a relay channel where information is protected by two layers of coding. In the first layer, transmission reliability is ensured by fountain coding at the source. The second layer incorporates network coding at...
The grid expansion is the most usual alternative to increase the coverage of distribution utility in rural areas. However, this alternative has several constraints related with its costs, the dispersion of costumers, assets configuration (mostly radial), and reliability, among others. This paper summarizes the main issues concerning to supply the energy demand in rural areas. Technical and economic...
Due to their remarkable merits, partial resonant ac link converters (PR-acL) have received noticeable attention during the last few years. These converters are compact, reliable, efficient and they offer longer life time compared to the other types of converters. However, they require more switches which make the control process more complicated. In this paper, a modified configuration that reduces...
Climate change and severe weather impacts on transportation and infrastructure have become global and environmental issues in the whole world. All human and transportation infrastructure systems are affected by climate change. Taiwan was hit by Typhoon Morakot and it caused a flood disaster in August 2009. This research focuses on the weather assessment measures of network reliability under route...
Under the severe energy crisis and the fast development of cloud computing, nowadays sustainability in large data centers receives much more attention than ever. Due to its high performance and reliability, RAID, particularly RAID-5, is widely used in these data centers. However, a challenge on the sustainability of RAID-5 is its scalability, or how to efficiently expand/reduce the disks. The main...
Due to their high reliability and luminous efficacy, HB-LEDs are being widely used in lighting applications and, therefore, their power supplies are required to have also high reliability and efficiency. A very common approach for achieving this in ac-dc applications is using a two-stage topology. The Power Factor Corrector Boost converter operating in Boundary Conduction Mode is a very common converter...
This paper proposes a novel single stage Photovoltaic (PV) inverter which fulfills all the system requirements (i.e. inverting dc voltage to proper ac, stepping up or down the input voltage, maximum power point tracking (MPPT), generating low harmonic ac current and input/output isolation). This three-phase inverter is a new class of partial resonant ac link converters in which the link is formed...
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