Academic literature on the topic 'Reliable work schedule'
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Journal articles on the topic "Reliable work schedule"
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Lebedeva, Ol'ga. "INDICATORS OF ESTIMATION OF EFFICIENCY OF PUBLIC TRANSPORT WORK." Modern Technologies and Scientific and Technological Progress 2018, no. 1 (March 23, 2020): 108–9. http://dx.doi.org/10.36629/2686-9896-2020-2018-1-108-109.
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The indicators of the evaluation of the efficiency of work on urban passenger
transport are considered. The variants of transport costs reduction by route survey and provision of
reliable service by rolling stock rolling on schedule with minimally modified time are considered.
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Suvorov, D. M., and N. V. Tatarinova. "Efficiency of CHPP Operation in Heat-Supply Systems when the Transition to Lowered and Extended Schedules of Heating Regulation." Problems of the Regional Energetics, no. 3(55) (August 2022): 68–83. http://dx.doi.org/10.52254/1857-0070.2022.3-55.06.
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The aim of the work is a theoretical study of the efficiency of heat supply based on a software package that includes mathematical models of a real CHPP, a real heating network and real heat consumers with a high share of hot water supply load using extended and reduced temperature schedules of heating regulation. The set aim is achieved by solving the following problems: choosing a method for calculating various schedules of regulating heat supply from CHPPs; construction of initial, reduced and extended temperature schedules and schedules of delivery water consumption; determination of optimal energy costs and heat-transfer agent costs. The most important of the results achieved is the carried analysis of the energy and economic efficiency indicators changes during the transition from the traditional to lowered and extended schedules of heat-supply system regulation. The total fuel savings at CHPP during the transition from the initial design temperature schedule with a maximum delivery water temperature of 150°C to the most energy efficient schedules reaches about 2%, which should be recognized as very significant. The significance of the obtained results lies in the fact that they allow calculating the energy effect in the form of fuel savings at CHPPs compared to their operation with the design temperature schedule. It is shown that the use of these technologies will increase the efficiency of district heating that will ensure a reliable and high-quality supply of heat energy to consumers and reduce its cost.
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Shahin, A., S. M. AbouRizk, Y. Mohamed, and S. Fernando. "Simulation modeling of weather-sensitive tunnelling construction activities subject to cold weather." Canadian Journal of Civil Engineering 41, no. 1 (January 2014): 48–55. http://dx.doi.org/10.1139/cjce-2013-0087.
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In cold regions, weather introduces a great deal of uncertainty to weather-sensitive construction activities, resulting in project schedules that deviate from plans. To maximize construction process productivity, decisions regarding process execution planning and sequence of work need to be made, based on reliable plans and schedules. Faced with winter weather uncertainty in cold regions, this task becomes quite challenging. This paper follows the framework that was proposed in the literature for simulating weather-sensitive construction projects executed under cold weather conditions. In the literature, the authors applied the framework steps to enable simulating and planning pipeline construction activities under severe cold weather. The proposed framework sets out a work breakdown structure of activities to account for and quantify weather impact on the project schedule. The steps outlined in the framework are followed to enable simulating and planning tunnelling construction activities executed under severe cold weather conditions. Relevant simulation findings, which clarify the impact of cold weather events on construction projects and can assist in project planning and decision support, are reported.
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Matteson, Alicia V., and Bonnie Moradi. "Examining the Structure of the Schedule of Sexist Events: Replication and Extension." Psychology of Women Quarterly 29, no. 1 (March 2005): 47–57. http://dx.doi.org/10.1111/j.0361-6843.2005.00167.x.
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The current study reexamined the factor structure of the Lifetime and Recent scales of the Schedule of Sexist Events (SSE; Klonoff & Landrine, 1995 ) and conducted the first factor analysis of the SSE-Appraisal scale ( Landrine & Klonoff, 1997 ). Factor analyses conducted with data from 245 women yielded, for SSE-Lifetime and SSE-Appraisal scales, two reliable factors that can be scored as “Intimate and Personal Experiences of Sexist Events” and “Unfair Treatment Across Public Contexts” subscales. Data from the SSE-Recent scale yielded three factors that can be scored as “Sexist Degradation and Its Consequences,” “Unfair and Sexist Events at Work/School,” and “Unfair Treatment in Distant and Close Relationships” subscales. Recommendations are made for the future use of these proposed subscales in conjunction with total scale scores in research using the SSE to examine links between reported experiences of sexist events and women's health and well-being.
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Shahtaheri, Maryam, Carl Thomas Haas, and Tabassom Salimi. "A multi-dimensional joint confidence limit approach to mixed mode planning for round-the-clock projects." Engineering, Construction and Architectural Management 24, no. 1 (January 16, 2017): 40–60. http://dx.doi.org/10.1108/ecam-10-2015-0165.
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Purpose Good planning is key to good project performance. However, for the sub-class of round-the-clock projects requiring mixed mode planning a suitable planning approach does not exist. The purpose of this paper is to develop and validate such an approach. Design/methodology/approach Development of the approach builds on a synthesis and extensions of previous work related to projects with round-the-clock schedules, containing multiple workflows (sequential/cyclical). This approach considers the interdependence among shift-schedule, productivity, calendar duration, and risk registers. It quantifies the confidence in those strategies using a Monte Carlo and a multi-dimensional joint confidence limit (JCL) simulation platform. Findings n of workflows and their interdependencies. Also, the platform results show that the deviation between the deterministic outcomes and the simulated ones are a good indicator when dealing with projects with minimal tolerance for possible imposed mitigation strategies (e.g. round-the-clock projects). Research limitations/implications The validation of the approach is limited to a multi-billion dollar nuclear refurbishment case study and functional demonstration. The applicable class of projects is limited, and includes those for which failure of cost, schedule, or quality implies project failure. Originality/value It is anticipated that the proposed approach will assist with developing a realistic planning strategy by incorporating various factors and constraints under the impact of risks and uncertainty. This may lead to a more reliable determination of outcomes for round-the-clock projects.
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Zákányiné Mészáros, Renáta, Gyula Tóth, and Balázs Zákányi. "Hungarian regulation and practice of confined space works in the water utilities sector." Multidiszciplináris tudományok 12, no. 4 (2022): 153–60. http://dx.doi.org/10.35925/j.multi.2022.4.16.
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In Hungary, public water facilities - drinking water works and wastewater disposal and treatment plants - are operated by companies with a valid water utility licence. During operation, the operator must ensure an organised working schedule, on-call and stand-by service which, in addition to a continuous and reliable service, enables it to intervene immediately in the event of a fault in order to remedy or mitigate operational and environmental damage and to restore service as soon as possible. In many cases, these unplanned interventions can be classified as work with boarding, such as work in manholes or pipelines, repair operations on hydroglobuses (water towers), or even unplanned interventions in waterworks reservoirs. In the course of our work, we summarise the regulation of boarding work in Hungary. We describe the possibilities of employer measures that are part of the regulation. We also compile a list of the most common operations in the water utilities sector and the dangers of boarding, which can be of great help to both those who authorise boarding and those who carry it out.
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Pupa, Andrea, Wietse Van Dijk, Christiaan Brekelmans, and Cristian Secchi. "A Resilient and Effective Task Scheduling Approach for Industrial Human-Robot Collaboration." Sensors 22, no. 13 (June 29, 2022): 4901. http://dx.doi.org/10.3390/s22134901.
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Effective task scheduling in human-robot collaboration (HRC) scenarios is one of the great challenges of collaborative robotics. The shared workspace inside an industrial setting brings a lot of uncertainties that cannot be foreseen. A prior offline task scheduling strategy is ineffective in dealing with these uncertainties. In this paper, a novel online framework to achieve a resilient and reliable task schedule is presented. The framework can deal with deviations that occur during operation, different operator skills, error by the human or robot, and substitution of actors, while maintaining an efficient schedule by promoting parallel human-robot work. First, the collaborative job and the possible deviations are represented by AND/OR graphs. Subsequently, the proposed architecture chooses the most suitable path to improve the collaboration. If some failures occur, the AND/OR graph is adapted locally, allowing the collaboration to be completed. The framework is validated in an industrial assembly scenario with a Franka Emika Panda collaborative robot.
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Henning, Robert A., and Glenn F. Wilson. "Evaluation of Work Schedules Using Psychophysiological Measures." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 39, no. 12 (October 1995): 779. http://dx.doi.org/10.1177/154193129503901206.
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While the primary goal of this symposium is to demonstrate the utility of psychophysiological measures in the evaluation of work schedules, the more general goal is to promote the use of psychophysiological measures in organizational design and management research. There are several good reasons to include psychophysiological measures in ergonomic evaluations. Foremost among these is that the information provided about worker well-being and performance capabilities cannot be obtained in other ways. Psychophysiological measures provide continuous, non-invasive, and objective measurement of an individual's response to work activities. Because of known relationships between physiological mechanisms and behavior, work-induced changes in physiological response can be used to monitor the effects of organizational design on work demand or recovery. Most would agree, however, that psychophysiological measures are seldom meaningful unless they are collected and analyzed in conjunction with other measures. In particular, psychophysiological measures can provide crucial information about worker well-being when subjective reports of distress or discomfort are biased by psychosocial factors, and also when workers compensate for increases or decreases in work demand by drawing on reserve capacity. In cases where performance measures or subjective reports are more reliable, measurement of psychophysiological responses can provide convergent results that add to the scientific validity of the research investigation. This explains why all researchers in this symposium use a balanced approach and analyze performance and/or subjective ratings in combination with psychophysiological measures. Beyond the scientific rationale for including psychophysiological measures in ergonomics research, many of the practical difficulties researchers faced in the past have been eliminated by recent technological advances. Modern heart rate monitoring systems, for example, have noise suppression features that improve signal quality and allow data collection in real work settings. Portable data loggers enable researchers to monitor multiple physiological response measures over 24-hour periods. Handling large data sets is no longer a problem because the digital storage capability of small computers is nearly unbounded. Data analysis software, such as time series analysis, has become more sophisticated and easier to use. What all this means in practical terms is that it is no longer necessary to dedicate a major portion of one's career to surmount the technical problems associated with psychophysiological research. The wide range of work scheduling topics covered in this symposium is a good example of the utility of psychophysiological measures in ergonomics research. Specific work scheduling topics include: appropriate rest break length at different times of the work day to ensure adequate recovery from sustained cognitive demand (Boucsein and Thum), methods for verifying the health and safety of underground miners working 12-hour shifts in shortened work weeks (Duchon and Smith), the impact of self-managed rest breaks on well-being during continuous computer work (Henning, Callaghan, Guttman, and Braun), and how assessing work efficiency during a cognitive task can be used to evaluate the effectiveness of work/rest schedules (Meijman). While the specific goals of these studies may differ, in each case the use of psychophysiological measures enhances the scientific validity of the research and provides important information about the relationship between work schedule design and worker well-being.
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DEMİR KAYA, Meva, and Figen ÇOK. "Turkish Version of the Silencing the Self in School Scale: Validity and Reliability Study for Emerging Adults." International Journal of Psychology and Educational Studies 9, no. 3 (July 10, 2022): 719–29. http://dx.doi.org/10.52380/ijpes.2022.9.3.760.
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The purpose of this study is to adapt the STSIS Scale to Turkish and to investigate its psychometric qualities. The scale comprises 22 items and three variables (self-silencing, divided self, and putting the teacher first).The study participants comprised 298 young adults with a mean age of 21.09 years. Utrecht Work Engagement Scale-Student Form, Negative Affect Schedule, and Perception Form for Life Skills were used to evaluate the scale's criterion validity. The construct validity was investigated using confirmatory factor analysis. In addition, test-retest and internal consistency coefficients were examined to evaluate the scale's reliability. The Turkish version of the scale consisted of three subdimensions related to the Negative Affect Schedule and Perception Form for Life Skills. In addition, reliability values for the scale were satisfactory. The internal consistency coefficient was .89, the composite reliability was .97, and the test-retest validity coefficient was .86. According to these findings, the Turkish version of the STSIS Scale is a valid and reliable tool for use with young adults.
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Garcia-Calvo, Santiago, Dario Luis Banegas, and Maria Sagrario Salaberri. "Satisfaction study in Bilingual Physical Education after applying a schedule based on content and language integrated learning." Sportis. Scientific Journal of School Sport, Physical Education and Psychomotricity 5, no. 2 (April 29, 2019): 305–22. http://dx.doi.org/10.17979/sportis.2019.5.2.5235.
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The work has a dual purpose (1) to know satisfaction in BPE-CLIL (Bilingual Physical Education in Content and Language Integrated Learning) and (2) to know if students’ satisfaction can be conditioned by gender and/or age. A non-linguistic discipline as Bilingual Physical Education assumes that it is necessary to take into account objectives of two types (contents and linguistic) and students’ satisfaction has a fundamental role. A quantitative analysis is done using a Sport Satisfaction Instrument (SSI) to collect data from Primary Education learners under a CLIL methodology. The questionnaire has been validated for bilingual Physical Education in Spain and it was applied to 350 students (5th and 6th grades of Primary Education) belonging to bilingual schools in the autonomous community of Castilla-La Mancha. It is a strong and reliable instrument since the internal consistency has indicated a high Cronbach's alpha regarding fun and boredom. Satisfaction indexes have been different regarding age and not regarding gender in Bilingual Physical Education in Primary Education.
Books on the topic "Reliable work schedule"
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Philip, Pierre, Stephanie Bioulac, Patricia Sagaspe, and Jean-Arthur Micoulaud-Franchi. Drowsy driving. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198778240.003.0021.
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Drowsy driving increases risk of traffic accidents. A major problem remains in the identification of drowsy drivers at risk for traffic accidents. Drowsy driving is the consequence of various behavioural factors (e.g. sleep duration, work duration, shift-work schedules) combined or not with sleep and iatrogenic disorders (e.g. obstructive sleep apnoea syndrome, hypersomnia, drug-induced sleepiness). Severity of sleep disorders is a non-linear predictor of traffic accident risk. In comparison, sleepiness at the wheel (SAW) can be considered as a reliable indicator of a combination of behavioural and sleep disorder factors, and is a better risk predictor. It remains thus very important to question patients about SAW when clinicians have to determine the medical fitness to drive of such patients. Because of the potential risk of under-reporting of SAW, especially in professional drivers, objective measures can help to complement the clinical evaluation. Further researches are needed to optimize objective measures able to predict the risk of traffic accidents due to drowsy driving.
Book chapters on the topic "Reliable work schedule"
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Khan, Laiq, Rabiah Badar, and Sidra Mumtaz. "Generators Maintenance Scheduling Using Music-Inspired Harmony Search Algorithm." In Meta-Heuristics Optimization Algorithms in Engineering, Business, Economics, and Finance, 448–83. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2086-5.ch015.
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This work explores the potential of Music-Inspired Harmony Search (MIHS), meta-heuristic technique, in the area of power system for Generator Maintenance Scheduling (GMS). MIHS has been used to generate optimal preventive maintenance schedule for generators to maintain reliable and economical power system operation taking into account the maintenance window, load and crew constraints. The robustness of the algorithm has been evaluated for five different case studies: 8-units test system, 13-units test system, 21-units test system, 62-units test system, and 136-units test system of Water and Power Development Authority (WAPDA) Pakistan. As per previous practice, WAPDA used to use manual scheduling based on hit-and-trial. The simulations have been carried out in MATLAB®. Based on its comparison with Genetic Algorithm (GA), it has been found that MIHS has fast convergence rate and optimal schedule for all the test systems satisfying the stated constraints.
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Coleman, John J. "The Regulatory History of Benzodiazepines in the Age of the Dark Web and Other Threats." In The Benzodiazepines Crisis, 160–92. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780197517277.003.0010.
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The US Congress enacted a tiered structure for controlling drugs based on relative abuse potential, which is commonly known as the Controlled Substances Act (CSA). The CSA codifies five levels, or schedules, to classify such problematic drugs, ranging from those that have no accepted medical utility (Schedule I) to those with known medical utility but having relative abuse potential ranging from low (Schedule V) to high (Schedule II). Unfortunately, the process that regulatory agencies use to assess the abuse potential of street drugs does not work as well or as reliably for medicinal substances. This chapter discusses these issues and summarizes the history of efforts by a variety of worldwide regulatory agencies to properly characterize the benzodiazepines and related drugs with regard to legitimate therapeutic use versus the public health risks posed by drugs with misuse/abuse potential. The inadequacy of some of the general approaches and some specific attempts are discussed. Also discussed are some of the unintended consequences resulting from uninformed, misguided, or misdirected efforts. New complications include the influx of counterfeit drugs from domestic and foreign sources, and the existence of the Dark Web.
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Raza, Zahid, and Deo P. Vidyarthi. "A Computational Grid Scheduling Model to Maximize Reliability Using Modified GA." In Applications and Developments in Grid, Cloud, and High Performance Computing, 16–35. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2065-0.ch002.
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This paper presents a grid scheduling model to schedule a job on the grid with the objective of ensuring maximum reliability to the job under the current grid state. The model schedules a modular job to those resources that suit the job requirements in terms of resources while offering the most reliable environment. The reliability estimates depict true grid picture and considers the contribution of the computational resources, network links and the application awaiting allocation. The scheduling executes the interactive jobs while considering the looping structure. As scheduling on the grid is an NP hard problem, soft computing tools are often applied. This paper applies Modified Genetic Algorithm (MGA), which is an elitist selection method based on the two threshold values, to improve the solution. The MGA works on the basis of partitioning the current population in three categories: the fittest chromosomes, average fit chromosomes and the ones with worst fitness. The worst are dropped, while the fittest chromosomes of the current generation are mated with the average fit chromosomes of the previous generation to produce off-spring. The simulation results are compared with other similar grid scheduling models to study the performance of the proposed model under various grid conditions.
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Elliott, Willliam, and Melinda Lewis. "Moving from the Status Quo to a 21st-Century Financial Aid System." In Making Education Work for the Poor. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190621568.003.0008.
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With the creation of the first federal student loans as part of the National Defense Education Act of 1958, the US postsecondary financial aid system was set on a path from which it has not fundamentally deviated in the intervening decades. While college financing has trended almost inexorably toward greater reliance on student borrowing as costs have outpaced families’ incomes, the major components of the financing “mix” have remained unchanged. Financial aid policy is sometimes tweaked around the edges to lighten the burden of student debt, give colleges a competitive edge, or address undesirable disincentives. For the most part, however, these reforms bear more resemblance to the classic “shell game” than to authentic innovations. What American students need are more powerful tools with which to approach their futures—tools that help them prepare for higher education, persist to completion, and then leverage returns on their degrees. What they get, however, are repackaged versions of the same blunt instruments. While everyone wants improved outcomes from our financial aid investments, the nation’s apparent inability or unwillingness to innovate truly novel approaches to paying for higher education stands in the way of progress. The goal of financial aid policy has been narrowly framed as only helping young adults pay for college, a low bar that completely ignores the role financial aid could play in influencing early education, postsecondary completion, and post-college financial health. As a result, instead of receiving support at critical junctures along the opportunity pipeline to a prosperous adulthood, students are largely left to their own devices except at the moment when the tuition bill becomes due. To capitalize on the resulting missed opportunities, the United States needs more than different loan repayment schedules or loosened rules on grant disbursement. What we need is a fundamental shift in how we think about financing higher education and what we believe about why it matters.
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Yesuf, Nassir-Maru. "An Ethnographic Study on Sense of a Community: The “Awramba” Experience." In Sustainability, Ecology, and Religions of the World [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105953.
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The study was conducted on “Awramba” Community who are living in “Amhara” region, south “Gondor” Zone, Ethiopia. The general objective of this study was to capture an understanding of sense of community in “Awramba” community. The study tried to answer the following questions: How the community was established? What are the criteria to be part of the community? What are the shared values of social practice that has survived for the test of time? What is the historical background of the “Awramba” Community? The researcher used realist ethnography method to achieve the above objective and to answer the questions. In-depth interview and observational guide techniques were applied to collect reliable data for the study. The observation and in-depth interview data were analyzed qualitatively. The study showed the following themes: Membership criteria of the community are based on adhering to the community norm. They have a strong sense of community based on shared story, cooperative work, marriage and mourning values, religious view, gender equality, commitment to be honest, and solving their problem by themselves. The emotional connection of the “Awramba” community is strengthened by their common celebration of the yearly anniversary of New Year and scheduled meeting.
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Kedia, Bipin, and Ilangovan Balasundar. "Titanium Alloys: Thermomechanical Process Design to Achieve Superplasticity in Bulk Material." In Titanium Alloys - Recent Progress in Design, Processing, Characterization, and Applications [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108463.
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Titanium alloys subjected to suitable thermomechanical processing (TMP) schedules can exhibit superplasticity. Most studies on superplasticity of titanium alloys are directed to sheet materials while studies on bulk materials are rather limited. Bulk Superplastic materials require lower load for forging aeroengine components. It further facilitates forming using non-conventional processes such as superplastic roll forming (SPRF). Multi axial forging (MAF), is employed here to achieve bulk superplasticity by imparting large strain without any concomitant change in external dimension. A comparison between uniaxial and MAF with respect to strain, strain path, initial microstructure and heat treatment was carried out to ascertain the microstructure refinement in Ti-6Al-4V alloy. A fine-grained structure was obtained after 3 cycles of MAF followed by static recrystallization at 850oC. Grain boundary sliding was observed in identified processing domain along with strain rate sensitivity (SRS) of 0.46 and maximum elongation of 815%. Validation of established ther¬momechanical sequence on a scaled-up work piece exhibited 640% elongation in domain (T = 820oC, ε ̇ = 3 x 10-4/s) which indicated that the established TMP scheme can be used on a reliable and repeatable basis to achieve superplasticity in bulk material.
Conference papers on the topic "Reliable work schedule"
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Cretu, Ovidiu, Vlad Cretu, Terry Berends, and Robert Stewart. "Risk Based Estimate: Keep It Simple..." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39789.
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The project cost and schedule estimate is a very subtle effort that needs to be repeated throughout the entire project’s life. The relatively new method of including risk events into the project cost estimate makes this effort more sensitive to subtleness. The authors have noticed during their work with other professionals that it is a tendency to make the processes of cost risk analysis (Risk Based Estimate (RBE)) more complicated than they should be. The authors call this tendency as “professional sophistication” when the RBE includes too many activities, too many uncertainties, and too many risk events. The “professional sophistication” usually is detrimental to the entire cost and schedule risk analysis and it constitutes a significant source of the analysis’ failure. The paper presents few cases when so called “professional sophistication” led to the initial analysis failure and if not caught in time to the project cost and schedule misrepresentation. The paper presents the reasons why the “Keep It Simple Smarty (KISS)” principle is critical for a robust and reliable cost and schedule risk analysis. The papers evaluate the impact of having too many variables included into RBE. It makes recommendation about the optimum number of variable that may be incorporated in the cost risk analysis. The ultimate recommendation is about being sure that the Risk Based Estimate includes only the uncertainties or risk events that may change significant the project cost or schedule.
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Wu, Jingyi, Yang Yu, Jianxing Yu, Lixin Xu, Fanlei Wu, and Xueying Chang. "Restoration Models for Quantifying Resilience of FPS Under Mooring Failure." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-81033.
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Abstract During its service life, floating production system (FPS) is exposed to various risks, with mooring failure being one of the catastrophic events. Based on the recorded failure data, it is definitely not a single event. Resilience investigation would improve the performance of FPS under adverse events. In order to assess and quantify the resilience of a FPS under mooring failure, it is essential to use reliable capacity restoration metrics and models. So far, there are no restoration models available for FPS under mooring failure, which help quantify the pace of post-failure capacity and functionality gain to facilitate well-informed decision making for reliable prioritization and efficient allocation of resources in restoration work. This paper proposed a reliable restoration model based on the schedule of restoration tasks for mooring repair. The restoration tasks are carefully analyzed and the key influence factor, damage extent is categorized. Proposed restoration models are then illustrated and validated by traditional FPS under mooring failure.
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Huang, Z., S. Ryu, D. Lee, and C. S. Hughes. "Reliable Estimation of Low-Frequency Viscous Damping for a Turret-Moored FLNG in Current." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78711.
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For a turret-moored Floating Liquefied Natural Gas Plant (FLNG), it is important to use confidently derived low frequency viscous damping coefficients in the prediction of its motions and mooring loads in wind, wave and current conditions. In this paper we present our recent experimental work on the low frequency sway and yaw viscous damping in calm water and in current. In general, damping force is a relatively small portion of the total hydrodynamic force on an oscillatory model. In a previous ExxonMobil damping test in calm water (Huang et al., 2010), i.e. without current and wave, a deeply submerged double-body model was forced to oscillate to avoid surface wave contamination. An inertia compensation system was also designed to cancel the inertia force and the restoring force during oscillations, then the measured force was mainly damping force. Because of the schedule constraints of the present study, it was not possible to perform the submerged oscillation test. Instead, a forced oscillation test in water surface was performed based on KC-number and β-number. In order to obtain reliable damping coefficients, we had to carefully design the test conditions, i.e. current speeds, oscillation amplitudes and frequencies so that an adequate portion of damping force within the total force could be achieved with no significant surface waves that could contaminate the damping results being generated by the oscillating model. Good damping results were obtained. To check the acceptance of the test method based on Froude scaling, a limited number of tests were performed in which the oscillation amplitudes and frequencies were scaled down based on the Froude scaling. Magnitudes of the measured force and moment are significantly low. The time series of the measurements have drifting and significant noise. We could not confidently determine viscous damping results from the measurements.
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Akbar, Sajjad, and M. Shahid Khalil. "The Fatigue and Aging Effects on the Materials of the Nuclear Power Plant Components and Systems." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39848.
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The first generation of nuclear power plants (NPP) parts, components, equipment and systems have completed their predicted trouble free operational life. Now their materials are posing fatigue and aging effects for the future useful applications in the NPP. For the reliable future operations, this study is made for the management of the fatigue and aging effects on the components/systems. The neutron irradiation and normal aging phenomena will cause deterioration in the properties of materials by increasing brittleness-ductile transition temperature. This would affect the reactor pressure vessel as well. For the design purpose as well as estimating the permissible service life of a reactor pressure vessel, it is essential to have reliable data regarding this effect. Considerable efforts have been made and data search carried out on this work. The routine and schedule maintenance programs are the prerequisite means of managing fatigue and aging effects. Therefore, these are monitored through collecting data on plant service condition, inspection, surveillance, testing and by regularly monitoring such programs. This paper presents the future course of actions, which are necessary in the enhancement of the useful and safe NPP operations throughout the world.
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Zhukova, Kseniia, Miroslav Antonic, Mišo Soleša, and Dragan Camber. "Data-Driven Model for Measuring Hydraulic Fracturing Efficiency by Utilizing the Real-Time Treatment Data." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22384-ms.
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Abstract The paper presents a practical tool for hydraulic fracturing efficiency evaluation. The tool is based on a data-driven approach that helps in interpreting real-time data. Based on the hydraulic fracturing (HF) job monitoring, statistic metrics and key performance indicators (KPIs) are generated to be valuable input for further designs and identification of potential savings in operation. Machine learning (ML) algorithms are proposed to reduce the tedious work of completion engineers by automatically classifying each treatment schedule's timestamp and assigning the stage label. For operation stages classification Support vector machines and neural networks algorithms are used. These models are trained and evaluated on real-time treatment datasets. After automatic stage recognition, relevant statistic parameters are calculated, enabling advanced data analytics. Detailed analysis of historical data allows to identify the areas for improvements and set new best practices. The first research objective was to gather data from various companies and structure them under the same template to conserve the most critical information gained during the hydraulic fracturing job. Afterwards, the data are preprocessed and labelled by using signal processing routines that significantly decrease the labelling time. The labels or classes are used to define different stages that can be distinguished during the treatment. Finally, the goal is to decrease the necessary time for data labelling. Therefore, two multiclass classification models (Support Vector Machines (SVM) and Neural Network (NN)) are built and evaluated. Based on evaluation metrics, both models resulted in high accuracy and reliable results. However, the SVM model resulted in slightly higher accuracy and an F1 score. The key value of these models is that they provide a computational method to extract a pumping schedule from hydraulic fracturing time-series data automatically. Also, these models allow conducting post-job analysis and choosing the proper pump schedule for a future HF treatment based on previous experience. This past-job analysis could contribute to the effectiveness of future operations by utilizing the materials and fluids more efficiently.
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Kitajima, J. P. W., and S. C. S. Porto. "Estimated and Observed Performance of Heuristic Algorithrns for Task Scheduling on Heterogeneous Processors." In Simpósio Brasileiro de Arquitetura de Computadores e Processamento de Alto Desempenho. Sociedade Brasileira de Computação, 1997. http://dx.doi.org/10.5753/sbac-pad.1997.22629.
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Parallel applications with regular and well-known behavior, where task execution time estimates are fairly reliable, are suited to static task scheduling (in opposition to dynamic scheduling, performed during the execution of the application). This is the case of many parallel scientific applications. Task scheduling on a heterogeneous environment, where processors present different processing speeds, is even more complex than on a homogeneous one. Static task scheduling is, thus, performed based on estimated data about the parallel application and the system architecture, and has long taken a heuristic approach. Therefore, a realistic performance evaluation of a task scheduling algorithm can only be fully accomplished if practical results are also considered. In this sense, the present work analyzes the quality of greedy and tabu search task scheduling algorithrns comparing estimated deterministic results with the actual observed makespan of several parallel synthetic applications executing on real parallel machines following the static schedule previously determined.
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Obata, Tatsuya, Akihito Urashima, Kiyokatsu Watanabe, and Tsumoru Miyahara. "Advanced Construction Technologies for the Ohma Nuclear Power Plant Reactor Building of Electric Power Development Co., Ltd." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-30163.
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Electric Power Development Co., Ltd has been constructing Ohma Nuclear Power Plant aiming to start commercial operation in Nov. 2014. Ohma Nuclear Power Plant is located in Ohma-town, Aomori Prefecture and is a landmark power plant in which Mixed Oxide fuels can be loaded in the full core of the reactor. Hitachi-GE Nuclear Energy Ltd. and Kajima JV, both have extensive experience of nuclear power plant construction, are the main contractors of this project and supply the entire engineering, manufacturing of all major components, and execute the construction and commissioning for the reactor building. Ohma-town is located at the northernmost part of Aomori Prefecture bordering Tsugaru strait, where is exposed to severe cold and constant strong wind in winter. Such severe weather conditions make the construction very hard, however, Hitachi and KAJIMA tries to complete the project on schedule and on budget applying highly reliable advanced construction technologies, such as open-top and parallel construction method, all whether construction method, and large scale modularization technology. The groundbreaking (acquisition of the first construction permission) was already completed in May 2008. Its civil work steadily progressed, and the rock inspection was completed in Oct. 2009. Base mat will be completed in July 2010, and both building work and mechanical work go into full swing after installation of RCCV lower liner module.
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Kulkarni, Sameer, Mark L. Celestina, and John J. Adamczyk. "Development and Applications of a Stage Stacking Procedure." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69115.
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The preliminary design of multistage axial compressors in gas turbine engines is typically accomplished with mean-line methods. These methods, which rely on empirical correlations, estimate compressor performance well near the design point, but may become less reliable off-design. For land-based applications of gas turbine engines, off-design performance estimates are becoming increasingly important, as turbine plant operators desire peaking or load-following capabilities and hot-day operability. The current work develops a one-dimensional stage stacking procedure. This includes a newly-defined blockage term, which is used to estimate the off-design performance and operability range of a 13-stage axial compressor. The new blockage term is defined to give mathematical closure on static pressure, and values of blockage are shown to collapse to a curve as functions of stage inlet flow coefficient and corrected speed. Utility of the stage stacking procedure is demonstrated by estimation of the minimum corrected speed which allows stable operation of the compressor. Further utility of the stage stacking procedure is demonstrated with a bleed sensitivity study, which estimates a bleed schedule to expand the compressor’s operating range.
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Sahoo, Subrat. "RFID-GPS Enabled Project Material Control." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/210814-ms.
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Abstract Material control plays a vital role in the success of any construction linked Project. Any deviation in material identification and traceability due to human error, leads to cost and time impact due to shortages, delays due to re-ordering and price escalation. Radio Frequency Identification (RFID) device coupled with Global Positioning System (GPS) technology helps in maintaining real-time material database, with real-time location of materials at all stages of the project. RFID technology helps in the material identification and RFID tags are used for locating the materials utilizing the contact-less RFID reader. GPS technology helps in material positioning segment indicating the material location in the designated grid. RFID and GPS together establish their coordinates which instantly detects the material position and indicates an image of the storage yard digitally on the screen that eases material traceability in the designated space. Implementation of an RFID-GPS enabled material control system creates a dynamic material database that brings in transparency and real-time information on material status. RFID-GPS system enables ‘End to End’ Material Tracking with updated real-time data and physical availability status throughout project duration starting from the receipt, storage, issuance and further installation at site till start-up. RFID-GPS enabled system ensures faster delivery of material information as compared to the manual processes and aids material coordinator with reliable information that can help to take decisions for optimization of the project vitals. Real-time information about material receipt upon entry into project premises without time lag helps to acknowledge missing items and generate short supply materials instantly, thereby averting schedule disruption. Any missing or un-traceable material is notified well in advance for timely action. Dynamic material database keeps all stakeholders in unison on the inventory status and can reduce incidents or loss of material from site. The system has definite advantage of reducing the Construction man-days lost due to re-works arising out of material identification, searching, segregation based on material composition. RFID systems have the potential to improve work productivity and enhancing better project schedule adherence, overcoming human error in manual material control at project sites.
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Simoes, Anabela, and Ling Suen. "Research Needs for a Quality Service Assessment Model of Inclusive Community Transport." In 13th International Conference on Applied Human Factors and Ergonomics (AHFE 2022). AHFE International, 2022. http://dx.doi.org/10.54941/ahfe1002455.
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IntroductionMobility is defined in the Universal Declaration of Human Rights as the freedom of movement from one place to another to conduct activities such as work, school, health, recreation, social or shopping. According to the 11th goal of the 17 Sustainable Development Goals adopted by the UN at the 2015 General Assembly ”to make cities and human settlements inclusive, safe, resilient, and sustainable”, accessible, reliable, safe, and comfortable transport services are required to serve multiple trip origins and destinations.This abstract discusses the research needs for the inclusion and equity in sustainable and resilient transport services by outlining the steps towards the development of a Quality Service Assessment Model (QSAM).Transport Services and Their Inherent Qualities Planning community transport services with people in mind requires the provision of a high-quality service embodying the following parameters:Inclusion – Inclusive transport should be open to all by offering accessible, safe, comfortable, and reliable services with human support along the travel chain.Equity – An equal distribution of resources by level and type of transport services should ensure that accessibility and affordability for everyone in the community are built into the operation.Sustainability - Every transport service should be sustainable, both in environmental and economic terms, by offering green travel modes, which are adaptable to critical situations and reliable in schedule adherence.Resilience – When disruptive incidences or accidents occur during travel, the transport system should have standby solutions to ensure trip completion under safe and comfortable conditions.The Quality Service Assessment Model The QSAM is built upon the dynamic interactions in forum discussions by the following three actors: the Users versus those of the Service Providers. The third actor group involved would be independent Stakeholders composed of experts in the fields of Mobility, Transportation, Human Factors, and Rehabilitation, and Academicians, as they will balance the idea exchanges, hopefully resulting in recommendations on service improvements towards the fulfillment of the users’ needs within the service providers’ budgetary and policy constraints.MethodologyMultidisciplinary research teams are required in carrying out the following steps of work:1. Classify targeted user groups according to their mobility limits;2. Define relevant travel scenarios supported by simulation tools;3. Collect qualitative data by means of Focus Groups discussions that address both the users’ perception of the service quality relative to their needs and expectations, versus the service providers’ awareness about gaps between the actual/planned services.4. Design new improvement solutions to fill the service gaps;5. Develop guidelines and recommendations towards inclusion and equity in sustainable and resilient transport services.ConclusionsThis QSAM aims at developing an approach for community transport services that match users’ needs and expectations. Each recommended solution should be designed and tested in a simulation environment. The resultant design guidelines together with policy recommendations, to be published and disseminated, should guide transport providers in achieving the targeted inclusive and equitable mobility in a sustainable and resilient community.