Category: Notícias

Factors that affect the performance of networks. Is the probability that an asset, item, or unit will perform its prescribed duty without failure for a given time in a specified environment. Factors such as operator behavior, attitude of maintenance personnel and other operating conditions may render model prediction inacurate.Hall (1997) claimed that, in the mining industry, specialised equipment, more especially mobile equipment is affected by various factors under which the equipment operate. ΀cË+‡&Ҟäp2œMí«Òqòxo‘idp"™YƤmyaÆCŽD‹+mq‹xï“¥¥…[¯!Kïº%ȌÄT3FÌù©NÀ”ýë|9AÃá?Ý»5:¾Ò èi®#õ2bJªW̼úqË©xÙ+swú9&Ñ The reliability of the measures are affected by the length of the scale, definition of the items, homogeneity of the groups, duration of the scale, objectivity in scoring, the conditions of measuring, the explanation of the scale, the characteristics of the items in scale, difficulty of scale, and reliability estimation method. performance is about response time - how fast a message can be sent or how quickly a document can be retrieved. factors have been given an average percentage of more than 65 percent). 13, pp. There will then be a dual effect on OEE due to improved reliability. This guide emphasizes concepts, not mathematics. The errors made by the psychologist proving a test are another type of environmental factor that can affect reliability. There are many factors that affect marketing. In order to achieve good reliability, various derating factors have … factors affect reliability. affect the … Stress For electronic equipment, the most prominent stresses are temperature, voltage, vibration and temperature rise due to current. To analyze the factors which affect the reliability based on scores, let us see the factors which can affect the scores of test papers. endstream endobj startxref often affects its interrater reliability. important factors that have a high effect on the accuracy of estimation (i.e. This video is part of our online course on Reliability and Validity Assessment of a Measure. Moisture absorbed by insulating material results in lowering of surface and volume resis-tivities. 0 Reliability is the wellspring for the other RAM system attributes of availability and maintainability. Human reliability (also known as human performance or HU) is related to the field of human factors and ergonomics, and refers to the reliability of humans in fields … OSTI.GOV Conference: Factors that affect reliability of nondestructive detection of flaws in structural ceramics Recommendation: Reliability data for an equipment unit should be an aggregation of notifications registered for the equipment unit-tag number and its component tag numbers. The effect of each of these stresses on each of the components must be considered. Understanding how reliability and maintainability affect … To help with the research, a case study was conducted at BMSC. The impact of it can run the gamut from easily fixed with minimal losses to catastrophic, depending on factors like repair costs, total downtime, health and safety implications, and impact on production and delivery of services. The findings from the study show that Maintenance personnel and Truck Operator skills, staffing levels, supervision, the mode of loading trucks and environmental conditions have a significant impact on the reliability of mining Dump Tr, Keywords: Reliability, Meantime To Repair MTTR, Meantime Between Failure MTBF, Availability, Maintenanbility, Key Performance Indicator KPI, Dr. Dyson Galatia PhD, "Exploring Factors that Affect Reliability of Open Pit Heavy Mining Dump Trucks: A Case of Bisha Mining Share Company, Eritrea", International Journal of Science and Research (IJSR), https://www.ijsr.net/search_index_results_paperid.php?id=SR20528131656, Volume 9 Issue 6, June 2020, 206 - 219, Research Paper, Mining, Zambia, Volume 9 Issue 7, July 2020, Research Paper, Mining, Zambia, Volume 9 Issue 9, September 2020, Research Paper, Mining, Zambia, Volume 9 Issue 5, May 2020, Research Paper, Mining, Zambia, Volume 9 Issue 6, June 2020, International Journal of Science and Research (IJSR) Factors affecting the reliability of MCQs Prerequisite Knowledge . Following factors affects the reliability of audit evidence: The reliability of audit evidence is increased when it is obtained from independent sources outside the entity. Web. Equipment reliability assures that subsystems and components function as intended without failure for desired periods during their design life. Additionally, a covergent paralle strategy of mixed research methods approach was applied. • Explain what “classification consistency” and “classification accuracy” are and how they are related. Reliability engineering focuses on costs of failure caused by system downtime, cost of spares, repair equipment, personnel, and cost of warranty claims. Before diving into the reliability program key elements, we must understand the meaning of equipment reliability. Lack of data quality can make equipment reliability metrics meaningless (garbage in equals garbage out). hÞbbd``b`Ú$»ƒ=ˆ¥$Xæ æO ®ˆu¤® Äê±f‚XSA,7«ÄZb ‰»ÅLŒËAæ10’Küg¼ó À _+ : Environmental Factors Environmental factors such as uncomfortable room temperature, or distracting sounds are one form of unsystematic errors. 40 0 obj <>/Encrypt 24 0 R/Filter/FlateDecode/ID[<88C29DBDAA29B4082143FC678C0B2B97>]/Index[23 32]/Info 22 0 R/Length 84/Prev 839619/Root 25 0 R/Size 55/Type/XRef/W[1 2 1]>>stream Learn more about how you can improve maintenance practices What does item analysis tell us? Printed in Great Britain FACTORS AFFECTING THE RELIABILITY OF FIELD INSTRUMENTS A. Dump Trucks are one of the most critical equipment in the movement of material and their reliability has a great influence on the mine output. endstream endobj 24 0 obj <. ITG SUBJECT: RELIABILITY OF MANUFACTURED PRODUCTS. C-1, Avani Vihar, Raipur, Chhattisgarh, India, Postal Code-492014 Many system reliability predictive methods are based solely on equipment failures, neglecting the human component of man–machine systems (MMS). Reliability was first practiced in the early start-up days for the National Aeronautics and Space Administration (NASA) when Robert Lusser, working with Dr. Wernher von Braun's rocketry program, developed what is known as \"Lusser's Law\" . It can be said that a system must be reliably safe. 54 0 obj <>stream Unplanned downtime results into undesirable indirect cost of maintenance due to losses in production and the idleness of other machines in the production system. RAO: INFLUENCE OF ENVIRONMENTAL FACTORS ON COMPONENT/EQUIPMENT RELIABILITY 123 occur. McCabe’s V(G), Halstead’s E and program size are well-known complexity measures. Email: editor.ijsrnet@gmail.com, CopyScape | Creative Commons: CC-BY | Open Access, Copyright © 2020 International Journal of Science and Research (IJSR), https://www.ijsr.net/search_index_results_paperid.php?id=SR20528131656, International Journal of Science and Research (IJSR). Pragmatisim was the philosophical view that underpinned the study with a maltimethods approach. Biological activity-One of the endproducts of humidity/deposition of damp layer is growth of fungi. MTTR and MTBF are the independent variables in the availability function, A: You can also derive some other functions from this one, including the probability of failure F, which is 1-A; and reliability (R) which is 1/F, or 1/(1-A). There exists a significant relationship between each of these measures. Factors Affecting Interpretation of Reliability Coefficients Leslie Russek, PT, PhD, OCS1 I ... ICC and SEM, and to illustrate the effect of subject variability on these reliability coefficients. The term equipment reliability and maintenance (ERM) encompasses not only equipment, such as machines, tools, and fixtures, but also the technical, operational, and management activities, ranging from equipment specifications to daily operation and maintenance, required to sustain the performance of manufacturing equipment throughout its useful life. Bachman (1997) considers that the scores of test papers are determined by the following four factors: the language ability of candidates, … 23 0 obj <> endobj Availability, reliability, and maintainability: What’s the difference? As such, it entails proper performance management of the huge and capital intensive equipment which is utilised in the industry. Microelectronics and Reliability, Vol. Reliability and Maintainability characteristics; Meantime Between Failure (MTBF) and Meantime To Repair (MTTR) as well as failure mode patterns have been examined in order to identify the key sources of Truck downtime. It has been well established that social and psychological factors are important to worker satisfactio… Broken pencil, momentary distraction by sudden sound of a train running outside, anxiety regarding non-completion of home-work, mistake in giving the answer and knowing no way to change it are the factors which may affect the reliability of test score. electronic or electrical equipment. Environmental factors that strongly influence equipment reliability are included in Table 1, which provides a checklist for ... Each environmental factor that is present requires a determination of its impact on the ... increases with lower temperatures. What is Equipment Reliability? 9. However, it does include explanations of some statistics commonly used to describe test reliability. Identifying and understanding factors that can affect its reliability is important, in order to promote high standards for clinical use of the GCS. Reliability and maintainability are two factors that are heavily influenced by maintenance. A. ROWSE Water Resources Board, Reading Bridge House, Reading RG1 8PS, England Abstract--It has been the painful experience of most users of automatic hydrometric instruments, that the equipment appears … This framework consists of creating a vision and mission, ensuring availability of resources and empowering people to achieve organizational excellence. Inadequate data quality management processes. Unplanned downtime results into undesirable indirect cost of maintenance due to losses in production and the idleness of other machines in the production system. This information provides a full picture for assessing past, present, and future equipment performance and needs. Definitions of the factors that affect software reliability. 1. In fact, if those factors are different in the practice than in the study, the reliability of the findings cannot be expected to be similar. Program complexity. Culture refers to an organization’s values, beliefs and behaviors. Qualitative data was analysed through the inductive process of building from the data to broad themes and then proceeding to interpretation. Lewis, P, Schwarz, H, and Waldron, W. RELIABILITY FACTORS AFFECTING POWER PLANT MECHANICAL EQUIPMENT..Canada: N. p., 1971. For example, if a professional footballer was to perform a 40-m sprint test using timing gates it may render an ICC of 0.75, but the same 40-m sprint in high school athletes using a stopwatch will be much lower. The most common factors are known as environmental, organizational, interpersonal, individual, and buyer factors. This paper therefore, aims at identifying potential causes of Dump Truck downtime in order to establish a Framework that could be used as a tool by management to proactively identify breakdown causes and make informed decisions. Network. Further, quantitative data was analysed by the use of descriptive statistics from the Likert scale and graphs and tables have been used to highlight trends of data results. All organic materials are liable to deterio- Equipment failure happens. Dump Trucks are one of the most critical equipment in the movement of material and their reliability has a great influence on the mine output. 175 to 179 Pergamon Press, 1974. %PDF-1.6 %âãÏÓ These two factors are often abbreviated as MTBF (mean time between failures) and MTTR (mean time to recovery). Data collection was through document review (time series analysis), questionaires, personal interviews with key subject matter experts as well as through participant observation. These methods d… Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. METHODS Subjects A total of 32 therapists in 9 clinics participated in %%EOF The key enablers in creating the culture are enhanced by how the strategic leadership framework is developed. Simply put, IBM PMO allows reliability personnel to gain an understanding of all factors that affect equipment performance. The first key area where Maintenance can impact on equipment reliability is by having an appropriate preventive and predictive maintenance program in place. The reliability of audit evidence that is generated internally is increased when the related controls, including those over its preparation and maintenance, imposed by the entity are effective. During World War II, a Navy survey revealed that its electronics equipment was not operative 30% of the time. Asset availability is impacted by several factors. Research Paper | Mining | Zambia | Volume 9 Issue 6, June 2020, Exploring Factors that Affect Reliability of Open Pit Heavy Mining Dump Trucks: A Case of Bisha Mining Share Company, Eritrea, Achieving high production and productivity target is one of the core focus areas of the mining industry today in order to stay in business. Objective: The aim of this systematic review was to identify factors that influence reliability and to provide an evidence base for promoting consistent and reliable application of the GCS. To help with the research, a case study was conducted at BMSC underpinned the study with a maltimethods.! Ibm PMO allows reliability personnel to gain an understanding of all factors that have high! Reliability predictive methods are based solely on equipment reliability is by having appropriate... Consists of creating a vision and mission, ensuring availability of resources and empowering to. 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