Статті в журналах: "Operation productivity"

1

Štůsek, J. "Labour productivity comparison of milking vorker's operation between German and Czech farms." Agricultural Economics (Zemědělská ekonomika) 50, No. 5 (February 24, 2012): 231–34. http://dx.doi.org/10.17221/5195-agricecon.

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Pisilä, E., S. Kallo, T. Ahola, and K. Heinanen. "High productivity operation of Rautaruukki blast furnaces." Revue de Métallurgie 92, no. 3 (March 1995): 375–80. http://dx.doi.org/10.1051/metal/199592030375.

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3

Lee, Eun-Jai, Yun-Sung Choi, Min-Jae Cho, Koo-Hyun Cho, Jae-Heun Oh, Sang-Kyun Han, and Sang-Jun Im. "A Literature Review on Cable Extraction Practices of South Korea: 1990–2020." Forests 12, no. 7 (July 12, 2021): 908. http://dx.doi.org/10.3390/f12070908.

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Cable yarding technology remains the most effective operation in steep terrain harvesting systems; however, it has limitations and challenges. Using cable yarders (tractor-, truck-, and excavator-based) to extract tree lengths and whole trees has been common since the late 20th century in South Korea, and cable yarding operations were developed in the late 1800s in the United States and Europe. Machine potential and limitations must be understood to ensure the widespread use of technology, strong cooperation, and optimal selection of machinery size. We reviewed the literature on tower yarder performances from 1990–2021 to determine the alteration of yarders and its productivity pattern and obtained 23 papers; <2 publications per year discussed the determination of cable yarding productivity. We selected independent variables (e.g., silvicultural treatment, harvesting method, and cycle log volume) for cable yarding that would likely affect productivity. Data were analyzed to compare productivities under silvicultural treatment, the harvesting method, and yarding direction and identify the interaction mechanical power (i.e., lifting capacity and machine power), yarding distance, and slope. Cable yarder productivity rates generally depended on the silvicultural treatment, harvesting method, and yarding direction, particularly in clear-cut, tree-length, and uphill yarding operation activities. The lifting capacity, machine power, and slope had no significant correlation with yarders’ productivity, particularly in thinning operations, whereas, in clear-cut productivity, it was influenced by these variables. The results contribute to improving operation activities for cable yarding systems and towards future research directions.

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4

Shin, Young Keun, Tae Hyung Kim, Gwang Hee Kim, and Seung Woo Han. "Partial Simulation Model (PSM) Development for Productivity Analysis on Curtain Wall Operations in High-Rise Buildings." Applied Mechanics and Materials 174-177 (May 2012): 1942–45. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1942.

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High-rise building construction demands precise planning prior to actual operation. High-rise building construction has widely been planned in urban area. Curtain wall operation is one of important and fundamental operations in high-rise building construction. Curtain wall operation is composed of various activities. Precise planning is required for the effective management of such operation. Construction simulation technique has been considered an appropriate methodology for estimating construction performance which is required for the effective management of the project. However, simulation technique revealed serious limitations. Simulation technique has difficulty in preliminary modeling and application of changed conditions. This paper suggests a preliminary study for the research that overcomes traditional simulation technique limitations focusing on curtain wall operations.

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5

Musa, Abu Saleh Mohammad, and Mostafa Saidur Rahim Khan. "Benefits and Limitations of Technology in MFIs." Journal of Electronic Commerce in Organizations 8, no. 2 (April 2010): 54–65. http://dx.doi.org/10.4018/jeco.2010040105.

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Adoption of Information Technology (IT) in Microfinance Institutions (MFIs) has become one of the key indicators to improve operating efficiency and productivity of staff at all levels of the organization. Though the cost of investment in IT is a matter of concern, it has manifold benefits ranging from productivity improvement to socio economic development of the target clients. This paper focuses on the adoption of Point of Sale (POS) technology in MFIs and its benefits in operation, cost reduction and stakeholder relationship through an evaluation of a small-scale MFI, Come to Save (CTS), operating in Bangladesh. This paper reinforces that timely implementation of technology reduces cost of operation, attains economies of scale and increases outreach through increased staff productivity.

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6

Gilanipoor, N., A. Najafi, and S. M. Heshmat Alvaezin. "Productivity and cost of farm tractor skidding." Journal of Forest Science 58, No. 1 (January 27, 2012): 21–26. http://dx.doi.org/10.17221/4804-jfs.

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In this study, productivity rate and operation cost of farm tractor were evaluated in a mountainous natural forest. Data for the study came from a detailed time study in the Research and Educational Forest of Tarbiat Modares University (REFTMU) and was used to develop a multiple linear regression model to predict the skidding cycle time. The results showed that effective independent variables of skidding time were skidding distance and slope of skid trail (P = 0.01). Average productivity rate ranged from 2.43 to 2.60 m2·h–1. Total time and effective time, respectively. Total cost of the system was 10.24 USD·h–1 whereas 4.58% of the cost of skidding resulted from personal delay. The cost and productivity resulting from this study emphasized the importance for foresters to consider a farm tractor when designing skidding operations in young stands or prescribing a combination of two machines in mature stands.

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7

NAKAJIMA, Ryuichi, Sumiyuki KISHIMOTO, Bungo IINO, Hirohisa HOTTA, Haruo ITO, and Shigeki FURUYA. "High Productivity Operation in a Large Blast Furnace." Tetsu-to-Hagane 76, no. 9 (1990): 1458–65. http://dx.doi.org/10.2355/tetsutohagane1955.76.9_1458.

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8

Grassi, V. G. "Productivity Enhancements in Distillation, Operation, Design and Control." IFAC Proceedings Volumes 22, no. 8 (August 1989): 275–82. http://dx.doi.org/10.1016/s1474-6670(17)53368-6.

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9

Konno, N., M. Takasaki, H. Shiota, Y. Fujiwara, N. Takamatsu, and K. Soyama. "High productivity blast furnace operation at Nagoya works." Revue de Métallurgie 89, no. 4 (April 1992): 371–80. http://dx.doi.org/10.1051/metal/199289040371.

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10

Blevins, James P. "Productivity and exponence." Behavioral and Brain Sciences 22, no. 6 (December 1999): 1015–16. http://dx.doi.org/10.1017/s0140525x99232220.

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The experimental results reported in Clahsen's target article clearly distinguish regular from irregular processes and suggest a basic difference between items that are productively formed and items which are stored in the lexicon. However, these results do not directly implicate any particular combinatory operation (such as affixation), nor do they distinguish inflectional items from other productive formations.

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11

Baniassadi, Farshid, Amin Alvanchi, and Ali Mostafavi. "A simulation-based framework for concurrent safety and productivity improvement in construction projects." Engineering, Construction and Architectural Management 25, no. 11 (December 3, 2018): 1501–15. http://dx.doi.org/10.1108/ecam-12-2017-0266.

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PurposeSafety and productivity are key concerns in the construction projects. While safety looks to the construction workers need to work in a safe environment, productivity affects the project’s profitability and is of a paramount importance from the project owner’s view. The different perspective to the safety and productivity from these two major players in construction projects poses a potential for the conflict between the two. This problem can be fundamentally addressed by methods concurrently improving project safety and productivity. The paper aims to discuss this issue.Design/methodology/approachTo this aim, a discrete event simulation (DES) based framework applicable was proposed for complex and hazardous operations. The utility of the framework was tested using a case study of an eight-story residential building in the north-east part of Tehran, Iran. The excavation and stabilization operation was identified as the most hazardous and critical operation in this case. The framework could improve safety and productivity of this operation by 38 and 4 percent, respectively.FindingsThis framework is a complement to the conventional construction project safety and productivity planning methods. Its main application is in complex and hazardous construction operations.Originality/valueFor the first time, a comprehensive framework for concurrently improving safety and productivity of an entire project was proposed in this research. DES was used as the main modeling tool in the framework to provide anex-anteevaluation foundation applicable to a wide range of construction projects.

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12

YI, Chang-Yong, Han-Seong GWAK, and Dong-Eun LEE. "STOCHASTIC CARBON EMISSION ESTIMATION METHOD FOR CONSTRUCTION OPERATION." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 1 (July 13, 2016): 137–49. http://dx.doi.org/10.3846/13923730.2014.992466.

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Low carbon construction is an important operation management goal because greenhouse gas (GHG) reduction has become a global concern. Major construction resources that contribute GHG, such as equipment and labour, are being targeted to achieve this goal. The GHG emissions produced by the resources vary with their operating conditions. It is commendable to provide a statistical GHG emission estimation method that models the transitory nature of resource states at micro-scale of construction operations. This paper proposes a computational method called Stochastic Carbon Emission Estimation (SCE2) that measures the variability of GHG emissions. It creates construction operation models consisting of atomic work tasks, utilizes hourly equipment fuel consumption and hourly labourer respiratory rates that change according to their operating conditions classified into five categories, and identifies an optimal resource combination by trading off eco-economic performance metrics such as the amount of GHG emissions, operation completion time, operation completion cost, and productivity. The study is of value to researchers because SCE2 fill in a gap to eco-economic operation modelling and analysis tool which considers operating conditions at micro-scale of construction operation having many stochastic work tasks. This study is also relevance to practitioners because it allows project managers to achieve eco-economic goals while honouring predefined constraints associated with time and cost.

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13

Ghaffariyan, Mohammad Reza. "Reviewing productivity studies of skidders working in coniferous forests and plantations." Silva Balcanica 21, no. 2 (October 6, 2020): 83–98. http://dx.doi.org/10.3897/silvabalcanica.21.e56071.

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Skidding is an important element of harvesting operations, which contributes to the extraction of wood. A skidder can be used in different types of harvesting operations, such as thinning, clear fell, native forest thinning or salvage work. The main goal of this article was to review the available stud-ies on productivity of skidding operations in coniferous forests/ plantations. Information on skid-der productivity was collected from publications and then was classified in three regions, including North America, Europe and the Southern Hemisphere. The parameters affecting machine productivity included machine type/ size, tree volume/ log volume/ load volume, average skidding distance and slope of the ground for each reported productivity. The average productivity reported in the published reports ranged from 9.3 m3/PMH to 78.0 m3/PMH. Detailed information and conclusions collected from various studies can be of use to forest academic and industry users to gain knowledge about vari-ations of skidder productivity in different regions and site/ operation conditions, which can be helpful for predicting, controlling and improving current levels of productivity. 

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14

Marius, Bucur. "Modelling the grain terminal cargo supply process using the road transportation." Scientific Bulletin of Naval Academy XXIII, no. 2 (December 15, 2020): 241–50. http://dx.doi.org/10.21279/1454-864x-20-i2-033.

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The largest share of operations in a specialized port terminal consists in grain supply processes usually delivered by motor trucks, on traditional road transportation means. In this respect, any process improvement could add value with a high impact against the terminal productivity. The traditional grain port operation technologies can no longer be used because the maritime business in particular requires new operating rules embedded by the integrated logistics variables, that ensure a shorter delivering time and an enhanced safety framework for cargo operation. Under these circumstances, the processes’ automation using modern technologies of supply, internal transportation, storage and forwarding of cargo flow, permanently monitored with an accurate control of operations, have determined the modern silo functional model. Moreover, the specific operations in the terminal are not only performed by automated processes, but there are many interventions and activities dependent on the human factor. This paper comes with an element of novelty, depicting the most relevant subprocesses carried out in the process of receiving grains in the terminal, in case of road shipment by truck. The authors have developed a model on this scenario, under a logical and generally valid flow sequences, that can be used by both those who want to update the terminal effectiveness and those who forth seek to benefit from a modern terminal functionality, valuing the processes and subprocesses improvement potential, in order to increase the quality of actions taken and the labour productivity, by eliminating port operation congestion and ultimately increasing the operational profit.

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15

Obata, Hiroshi, Hiroyasu Takahashi, Masaru Nakamura, Toshihiko Natsumi, and Kiyoshi Komamura. "High productivity operation at Chiba No.4 Sinter Plant." ISIJ International 31, no. 5 (1991): 478–86. http://dx.doi.org/10.2355/isijinternational.31.478.

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16

OBATA, Hiroshi, Hiroyasu TAKAHASHI, Masaru NAKAMURA, Toshihiko NATSUMI, and Kiyoshi KOMAMURA. "High Productivity Operation at Chiba No.4 Sinter Plant." Tetsu-to-Hagane 76, no. 5 (1990): 667–74. http://dx.doi.org/10.2355/tetsutohagane1955.76.5_667.

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17

Katsura, Hiroki. "System for Improving Productivity, Operation Efficiency and Environmental Health." JAPAN TAPPI JOURNAL 74, no. 1 (2020): 34–40. http://dx.doi.org/10.2524/jtappij.74.34.

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18

Gülci, Sercan, Halit Halit Büyüksakallı, İnanç Taş, and Abdullah Emin Akay. "Productivity Analysis of Timber Skidding Operation with Farm Tractor." European Journal of Forest Engineering 4, no. 1 (June 12, 2018): 26–32. http://dx.doi.org/10.33904/ejfe.428397.

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19

J, Matsimbe. "Optimization of Shovel-Truck Productivity in Quarries." International Journal of Research in Advent Technology 8, no. 10 (November 10, 2020): 1–9. http://dx.doi.org/10.32622/ijrat.810202008.

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In open pit operations, the loading equipment drives production but the haulage fleet drives costs. Most quarries in Malawi face challenges in shovel-truck productivity due to factors which require optimization of mine operations. The case of Njuli quarry is used to come up with a model that can be applied by quarries in Malawi. Loading and haulage costs account as much as 50 – 60 % of a company’s total operation cost hence it is necessary to maintain an efficient shovel-truck system. This research optimized the shovel-truck productivity per day, applied the queuing theory to the haul cycle, and suggested ways to improve the efficiency of materials handling operations. Examining a match between truck body size and shovel bucket size yielded the size of the load, cycle time and number of trips in an hour. The cycle time depended on the weight of the equipment, the horsepower of the engine, haul distance, and condition of the road plus dump area. Quarry companies in Malawi will apply this new knowledge to improve equipment selection and maximize the tonnage of aggregates produced per day to meet production targets.

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20

Anderson, J. L. "Space Station Productivity from Information Technology." Journal of Engineering for Industry 107, no. 1 (February 1, 1985): 26–32. http://dx.doi.org/10.1115/1.3185960.

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A space station will involve the formation and operation of an assembly of humans and machines with the intent of achieving sustained operation in space for a period of 10–20 years. A major goal of space station technology efforts is to enable both the initial and evolutionary productivity of the space station. Because a space station is expected to be an information-rich system, technologies that improve the acquisition, processing, and interpretation of information will have a high leverage on station productivity. Specific information technology functions and requirements that promote human–machine productivity for a space station are examined.

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21

Hintze, Kayla, Courtney Bir, and Derrell Peel. "Economic Feasibility of Mixed-Species Grazing to Improve Rangeland Productivity." Animals 11, no. 5 (April 23, 2021): 1226. http://dx.doi.org/10.3390/ani11051226.

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Pasture and grazing land in the southern and central Great Plains is being invaded by woody species, especially eastern redcedar. As a result of woody plant encroachment, cattle production on native rangeland is becoming less profitable because stocking rates must be decreased. Eastern redcedar encroachment can be controlled by grazing management, herbicide use, prescribed fire, mechanical control and mixed species grazing. This study utilizes traditional management practices, prescribed fire and three types of mixed species grazing operations to determine the most economically feasible way to manage redcedar encroachment on rangeland. The cost-benefit analysis in this study found that the source of redcedar management on rangeland with the highest net present value was the use of a breeding goat operation in which goats were grazed alongside cattle with the use of prescribed fire. This suggests that producers who are fighting redcedar encroachment will likely be able to implement a mixed species grazing operation with breeding goats to better manage their land and increase returns.

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Istomin, A. B. "Metalworking issues." Glavnyj mekhanik (Chief Mechanic), no. 5 (May 14, 2021): 44–47. http://dx.doi.org/10.33920/pro-2-2105-04.

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An acceptable way to increase productivity in the course of individual operations is to develop a specialized tool designed for a specific production process. The time and financial expenses that are unavoidable in this case can be worth the effort when the profit is justified due to the long production process. However, finding the balance between productivity, reliability and the cost of the tools needed to produce small batches, which is becoming more common today, requires the use of a versatile tool that can provide flexibility in the production of a wide range of products. These tools reduce the time of forced inactivity by maximizing the time required to switch to a new tool when changing the workpiece. In addition, this reduces the need to install and perform test operations to test the new tool. The choice of tooling and machining parameters for a single operation depends on how the operation is "integrated" into the overall picture of the production process. The choice should be biased in the sense that it is desirable from the point of view of considering productivity, cost and reliability separately and from the point of view of the entire overall production process. To maximize productivity and economic benefits during the course of metal cutting operations, it is important to evaluate processes in terms of profitability derived from total production. The goal is to ensure the reliability of the machining process while maintaining high productivity and low cost. Achieving these goals involves learning some concepts that are counteracting each other.

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23

Adde, H. A., A. J. van Duinen, L. M. Sherman, B. C. Andrews, Ø. Salvesen, N. K. Dunbar, A. J. Bleah, T. G. Weiser, and H. A. Bolkan. "A Nationwide Enumeration of the Surgical Workforce, its Production and Disparities in Operative Productivity in Liberia." World Journal of Surgery 46, no. 3 (November 27, 2021): 486–96. http://dx.doi.org/10.1007/s00268-021-06379-8.

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Abstract Background Any health care system that strives to deliver good health and well-being to its population relies on a trained workforce. The aim of this study was to enumerate surgical provider density, describe operative productivity and assess the association between key surgical system characteristics and surgical provider productivity in Liberia. Methods A nationwide survey of operation theatre logbooks, available human resources and facility infrastructure was conducted in 2018. Surgical providers were counted, and their productivity was calculated based on operative numbers and full-time equivalent positions. Results A total of 286 surgical providers were counted, of whom 67 were accredited specialists. This translated into a national density of 1.6 specialist providers per 100,000 population. Non-specialist physicians performed 58.3 percent (3607 of 6188) of all operations. Overall, surgical providers performed a median of 1.0 (IQR 0.5–2.7) operation per week, and there were large disparities in operative productivity within the workforce. Most operations (5483 of 6188) were categorized as essential, and each surgical provider performed a median of 2.0 (IQR 1.0–5.0) different types of essential procedures. Surgical providers who performed 7–14 different types of essential procedures were more than eight times as productive as providers who performed 0–1 essential procedure (operative productivity ratio = 8.66, 95% CI 6.27–11.97, P < 0.001). Conclusion The Liberian health care system struggles with an alarming combination of few surgical providers and low provider productivity. Disaggregated data can provide a high-resolution picture of local challenges that can lead to local solutions.

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24

Rodríguez, Rogelio Lopez, Juan Carlos Quiroz Sánchez, Alicia Lopez Ortiz, Juan Gabriel López Hernández, and Olivia Yessenia Vargas Bernal. "Optimal Control in Manufacturing Areas Increase the Productivity in the Aerospace Industry of Mexicali, Baja California, México." Indian Journal of Management and Language 1, no. 1 (April 10, 2021): 26–32. http://dx.doi.org/10.54105/ijml.b2019.041121.

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The efficient control in the manufacturing control is very essential to increase the productivity and some specialized devices are made with and adequate functions. These devices are MEMS (Micro Electromechanical Systems), which are low-power microdevices widely used in the industrial processes of the Mexicali aerospace industry, which have the function of controlling the operation of industrial systems at any stage of manufacturing by evaluating the way to carry out their activities, comparing standardized values with data real and activate and deactivate high power actuator mechanisms such as fans, motors, electric pumps and other high power used in this installed industry. These microdevices have specific characteristics in their operation to obtain the best operational performance of industrial equipment and machines, at a low cost and partially operating according to the operating system reference values of industrial systems and generating a safe process in their operation. The industrial processes of the Mexicali aerospace industry require specialized knowledge because they manufacture components with very rigid operations because they are manufactured for aircraft with very rigorous regulations, due to the high security that air transport requires. MEMS have increased their use in the last ten years, where it has been applied to various industries due to the simple way of coupling with industrial systems, and this is why research was conducted to evaluate its use in a company in this city that they did not intend to use them and when observing that they increased their productive performance at one stage of their industrial processes, they chose to apply them in all their manufacturing areas. The investigation was from 2018 to 2019.

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Rodríguez, Rogelio Lopez, Juan Carlos Quiroz Sánchez, Alicia Lopez Ortiz, Juan Gabriel López Hernández, and Olivia Yessenia Vargas Bernal. "Optimal Control in Manufacturing Areas Increase the Productivity in the Aerospace Industry of Mexicali, Baja California, México." Indian Journal of Management and Language 1, no. 1 (April 10, 2021): 26–32. http://dx.doi.org/10.35940/ijml.b2019.041121.

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The efficient control in the manufacturing control is very essential to increase the productivity and some specialized devices are made with and adequate functions. These devices are MEMS (Micro Electromechanical Systems), which are low-power microdevices widely used in the industrial processes of the Mexicali aerospace industry, which have the function of controlling the operation of industrial systems at any stage of manufacturing by evaluating the way to carry out their activities, comparing standardized values with data real and activate and deactivate high power actuator mechanisms such as fans, motors, electric pumps and other high power used in this installed industry. These microdevices have specific characteristics in their operation to obtain the best operational performance of industrial equipment and machines, at a low cost and partially operating according to the operating system reference values of industrial systems and generating a safe process in their operation. The industrial processes of the Mexicali aerospace industry require specialized knowledge because they manufacture components with very rigid operations because they are manufactured for aircraft with very rigorous regulations, due to the high security that air transport requires. MEMS have increased their use in the last ten years, where it has been applied to various industries due to the simple way of coupling with industrial systems, and this is why research was conducted to evaluate its use in a company in this city that they did not intend to use them and when observing that they increased their productive performance at one stage of their industrial processes, they chose to apply them in all their manufacturing areas. The investigation was from 2018 to 2019.

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26

Temi, Pasquale, Douglas Hoffman, Kimberly Ennico, and Jeanette Le. "SOFIA at Full Operation Capability: Technical Performance." Journal of Astronomical Instrumentation 07, no. 04 (December 2018): 1840011. http://dx.doi.org/10.1142/s2251171718400111.

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The Stratospheric Observatory for Infrared Astronomy (SOFIA), the largest airborne observatory in the world, is in full operation capability since February 2014 and is currently completing its Observing Cycle 6 Program. The first four years of operation have provided the opportunity to assess the high-level observatory’s technical performance and to identify additional observatory upgrades. Since the start of routine operations, performance and productivity in several areas of the observatory, including science, operations and engineering, have been tracked by metrics and statistics. In this paper we present the general observatory technical performance as the observatory has reached its maturity and has served the science community with over 2900[Formula: see text]h of scientific observations.

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27

Liška, S., R. Klvač, and A. Skoupý. "Evaluation of John Deere 1490D operation phase in typical conditions of the Czech Republic." Journal of Forest Science 57, No. 9 (September 13, 2011): 394–400. http://dx.doi.org/10.17221/21/2010-jfs.

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The life cycle operation phase of John Deere 1490D energy wood harvester from the aspect of energy audit and environmentally negative influence caused by emissions were evaluated. Energy audit quantifies energy used in the form of fuels and oils as well as energy expended for manufacture, transport and distribution of these fuels and oils. Emissions produced by operation are determined according to the consumption of fuels and oils based on emission factors. We also made a comparison of the general calculation of costs based on data provided by the manufacturer with costs ascertained in real operating conditions. The costs are divided into purchase, operating and other costs. Total costs are subsequently converted into unit costs according to the assumed productivity of the machine, its estimated lifetime, and the mean real throughput of the machine. The machine throughput, and thus also its operating economics, is greatly dependent on the character of the processed material, its stem volume, moisture, way of dendromass preparation, and operator's skills. Energy use was calculated at 74.4 MJ·FU–1 (functional unit) related to fuel consumption and 13.4 MJ·FU–1 related to the consumption of oils. The total energy use of the life cycle operation phase of the slash bundler was determined as 87.8 MJ per each bundle produced. The real productivity of the machine in the given operating conditions was several times lower than the productivity indicated by the manufacturer.

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Diniz, Carlos Cézar Cavassin, Romano Timofeiczyk Junior, Renato Gonçalves Robert, Eduardo da Silva Lopes, João Carlos Garzel Leodoro da Silva, Felipe Martins de Oliveira, and Gustavo Silva Oliveira. "Influence of bifurcation on thinning, productivity and harvester production costs of Pinus taeda L." AUGUST 2020, no. 14(08):2020 (August 20, 2020): 1259–63. http://dx.doi.org/10.21475/ajcs.20.14.08.p2377.

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In this work, we present that how bifurcation in Pinus trees can influence productivity and harvester production costs. Our example draws from one harvesting machine that works in thinning operations in forest plantations of Pinus taeda L. in a small Brazilian forestry company. To get daily productivity, we use the machine’s system, which provides such daily information as total production. We also used a time and motion study to obtain the meantime to cut, delimb, and process the tree stem into logs. In this way, we separated the normal trees from the forked trees to get the operating cycle time of the machine and get the productivity to the two types of trees. The continuous timing method was used for this purpose. The results show an increase of up to 22.9% in the operational cycle time for cutting forked trees, resulting in reduction of productivity of 5.58 m³ for each hour worked. The production cost increased by 23.3% on operation of forked trees, as the machine took more time to perform the partial activities of the operational cycle. This study can help many companies and contractors to calculate the appropriate productivity and production harvest cost according to the type of tree stems from the plantation forest.

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Miyajima, Ricardo Hideaki, Paulo Torres Fenner, Gislaine Cristina Batistela, and Danilo Simões. "Effect of Feller-Buncher Model, Slope Class and Cutting Area on the Productivity and Costs of Whole Tree Harvesting in Brazilian Eucalyptus Stands." Forests 12, no. 8 (August 15, 2021): 1092. http://dx.doi.org/10.3390/f12081092.

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The operational productivity and costs of tree felling operations can be influenced by several factors, among which, the machine characteristics, slope class, the cutting area and the individual volume of the trees stand out. Thus, the main objective of the present study was to analyze the productivity and production cost for two feller-bunchers with different technical characteristics operating in a eucalyptus forest. The productivity was calculated from a time study and the factors analyzed were two feller-buncher models, two slope classes, and two cutting areas. The machine cost per scheduled hour was based on the methodology of the Food and Agriculture Organization of the United Nations. Analysis of the results showed that the felling and turn operational elements occupied the most time in the operational cycle of feller-bunchers. The machine cost per scheduled hour was USD 69.69 h−1 for feller-buncher 1 and USD 102.03 h−1 for feller-buncher 2. In conclusion, the distinct technical characteristics of feller-bunchers were found to influence the productivity and, consequently, the cost, of the felling operation during the harvesting of whole eucalyptus trees.

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Iung, B., G. Morel, and J. B. Léger. "Proactive maintenance strategy for harbour crane operation improvement." Robotica 21, no. 3 (May 13, 2003): 313–24. http://dx.doi.org/10.1017/s0263574702004824.

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Quay cranes are particular transportation devices for which operation's safety and CRAMP parameters (Cost, Reliability, Availability, Maintainability, and Productivity) should be fulfilled with regard to a harbor maintenance strategy. The maintenance process is first considered within a holistic modeling framework in order to cope with the current practices of treating strategic, operational and engineering maintenance issues independently without taking into account their interactions within an entire Enterprise System. Proactive maintenance is then highlighted as a new model aiming to globally optimize the components operation parameters throughout three interacting prognosis, diagnosis and monitoring processes. Technical issues related to Intelligent Maintenance System are finally proposed in order to support proactive maintenance operations at the enterprise field level and applied to quay cranes in a particular site within the frame of the European Eureka ‘Robcrane' project.

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Gür, Şeyda, and Tamer Eren. "Ameliyathanelerde Verimliliğin Çok Ölçütlü Karar Verme Yöntemleri ile Değerlendirilmesi." Academic Perspective Procedia 2, no. 3 (November 22, 2019): 973–81. http://dx.doi.org/10.33793/acperpro.02.03.109.

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Purpose: Determining the factors that affect productivity in operating rooms, which make up about one third of hospital expenditures, and developing strategies for these elements is a matter of importance for hospital managers. The fact that operating rooms are among the highest expenditure items and at the same time being among the highest sources of income has been the main factor in determining the factors affecting the efficiency of the operating room. Material and Method: Analytical network process method, which is one of the multi-criteria decision-making methods, which enables quantitative evaluation of qualitatively effective factors, was used. Results and Conclusion: In this study, the factors affecting the efficiency of operating rooms were evaluated. According to the results, it is seen that the usage of the operating room comes to the forefront at the same time and the personnel goes through the harmony with the colleagues. In addition, the accuracy of the operation times of the operations on the waiting list directly affects the effective use of the operating rooms. At this point, the cancellation rate of operations can be reduced by making effective plans with the correct estimated operation time. Thus, effective and efficient use of operating rooms can be increased.

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Simões, Danilo, Ricardo Hideaki Miyajima, Rodrigo Petrongari Tonin, Paulo Torres Fenner, and Gislaine Cristina Batistela. "INCORPORATION OF UNCERTAINTY IN TECHNICAL AND ECONOMIC ANALYSIS OF A FELLER-BUNCHER." FLORESTA 48, no. 3 (June 14, 2018): 403. http://dx.doi.org/10.5380/rf.v48i3.56404.

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The constant technical and economic analysis of timber harvesting operations is essential and determining, due to the monetary magnitude. Traditionally, these analyses are conducted deterministically, which does not allow obtaining values with probabilities of occurrence. Considering this issue, stochastic models were built in order to analyze the behavior of probabilistic production cost in felling operations with feller-buncher, through the Monte Carlo method. The study was conducted in the Central-West region of the state of São Paulo in a forest of Eucalyptus sp., with six years of age, planted in 3 x 2 m spacing. Technical analysis was based on the study of time and movements, which determined the effective productivity and economy in the hourly operating cost of the feller-buncher and in the production costs of the operation. Due to uncertainties, probability distributions were assigned to these results, which identified the most relevant variables and quantified the probabilities of the production cost. The results demonstrated that the fuel cost had a statistically significant strong positive correlation coefficient ( = 0.91) (p-value < 0.01). The hourly cost, consequently, was directly proportional to the production cost of the operation. The production cost of the operation in flat relief was 18% lower than the production cost of the operation in undulating relief.

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Niamsawan, Jongrak, and Suksan Prombanpong. "A Productivity Improvement of a Cookware Assembly Line." Applied Mechanics and Materials 799-800 (October 2015): 1398–402. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.1398.

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This research objective is to improve the productivity of cookware assembly line by means of time and distance reductions. The motion study and line balancing techniques were applied to the entire assembly operations. A bottle neck was identified to where the operation with inadequate machine layout and workplace organization, including the unbalanced workloads. The new workplace layout and new working method for operators were designed and implemented as well as balancing the assembly line. Specifically, the conveyor speed and duration between the consecutive workpieces in the production line were adjusted to 0.10 m/s and 50 cm, respectively. The number of operators needed in the process can be reduced from 14 persons to 11 persons. The cycle time for assembling process is decreased from 12 to 5 second.

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Dougherty, Sean M., and Robert H. McGuckin. "The Effects of Federalism on Productivity in Chinese Firms." Management and Organization Review 4, no. 1 (March 2008): 39–61. http://dx.doi.org/10.1111/j.1740-8784.2007.00091.x.

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This study offers empirical evidence about how the structure of government and private ownership affected productivity in Chinese firms. It uses the microdata of China's last decennial industrial census, covering all of the 23,000 large and medium-sized industrial firms operating in China during 1995. The results show that government decentralization – ‘federalism’ – played an important role in improving the performance of not just collective firms, but also state-owned and mixed public/private ownership firms. This result is strongly confirmatory of much of the recent theoretical work on transition economies that posits a key role for government in the efficient operation of markets.

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Selivanov, N. I., V. V. Averyanov, and D. V. Ushtyk. "MODELING TRACTOR PARAMETERS AND TILLAGE UNITCONFIGURATION TAKINGINTO ACCOUNT THE INFLUENCE OF NATURAL AND PRODUCTION FACTORS." Vestnik Altajskogo gosudarstvennogo agrarnogo universiteta, no. 9 (2021): 119–26. http://dx.doi.org/10.53083/1996-4277-2021-203-09-119-126.

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The research goal was to substantiate the model and the algorithm of forming the parameters of a wheeled trac-tor and the configurationof a tillage unit taking into account the natural and production conditions. To evaluate the in-fluence of natural and production conditions on the param-eters of the tractor and the unit configuration, three groups of factors were considered: the class of run length which determined the optimal value of the net productivity of the unit at a particular operation withminimal operating costs; characteristics of the draught resistance of the working machine which formed the optimal speed mode of unit op-eration; the indices of the drawbar pull and coupling prop-erties of the tractor which determined the conditions for effective functioning in the working mode. We substantiat-ed a computational model representing the response of a multidimensional dynamic system to external disturbances, setting and controlling actions which performed the trans-formation according to the input-output type. The interrela-tion of the input actions of different groups and the output parameters of the system were determined using the rea-sonable indices and optimization criteria. The adaptation to operating tillage technologies is determined by the nominal values of the working speed set according to the criterion of minimum energy consumption per unit of net productivity taking into account the restrictions on the drawbar pull and coupling properties of the tractor ensuring operation in the zone of maximum pulling efficiency. The adapters to the production conditions are specific ones referred to the unit of net productivity at nominal speed, the working width of the unit, the operating weight and the required power of the tractor. The product of specific indices by the optimum for a given run length and type of operation, the value of net productivity determines the parameters of the tractor and the unit configuration taking into account the influence of natural and production factors. The algorithm for optimizing parameters was developed; four rational standard sizes of wheeled tractors with an operating power of 135 to 310 kW with adjustable weight and unit configuration for technical support of tillage technologies in the main natural and cli-matic zones of operation were substantiated with an adap-tation coefficient of 0.978-0.987.

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Matsuda, Keishi, and Hidenori Ishihara. "Maximization of Productivity by Distributed Robot System for Manufacturing Operation." Applied Mechanics and Materials 157-158 (February 2012): 1640–45. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.1640.

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These days, research of multiple robots, which has distributed function and maximize their total ability have been frequently observed in the field of rescue robots or soccer robots tournament called ROBOCUP. This shows the rapidly growing need of more sophisticated multiple robots which are more dependable compared to function-integrated single robots. Accordingly, several studies have been made regarding sharing and distribution the knowledge which are obtained from the sensory operation. This knowledge must be utilized not only for geographical navigation but for highly complicated exercises. Asama et al. proposed the Intelligent Data Carrier (IDC) with the aim of sharing knowledge among the robots. This utilization of memory media has disadvantage of an increase in cost and redundant need of supervising system for the memory modules. Therefore, in this paper we propose the knowledge sharing system and autonomous line control system using the broad band wireless communication devices, such as wireless LAN and BluetoothR. If the robot modules are equipped with the independent communication systems, efficient and simplified unitary system shall become the practical use. This enables the robot to manage the knowledge interactively.

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Lee, Dong-Eun, Yong-Woo Kim, and Chang-Baek Son. "Estimating Productivity of AL-Form Operation Using Web-CYCLONE System." Korean Journal of Construction Engineering and Management 14, no. 3 (May 31, 2013): 115–22. http://dx.doi.org/10.6106/kjcem.2013.14.3.115.

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Berg, Simon, Mika Yoshida, Rin Sakurai, and Hideo Sakai. "Productivity of loaders and forwarders in Japanese forestry operation conditions." Journal of Forest Research 23, no. 3 (May 3, 2018): 149–55. http://dx.doi.org/10.1080/13416979.2018.1469208.

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Henning, Ray. "Work Measurement and Productivity Improvement." Arboriculture & Urban Forestry 17, no. 3 (March 1, 1991): 80–81. http://dx.doi.org/10.48044/jauf.1991.021.

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In the past, equitable evaluation of the work performed by contract or company overhead line clearance crews was not easily accomplished. In 1972, Ohio Edison Company developed and implemented a Work Measurement System as a solution to this problem. Over the years, the System has been automated, enhanced, expanded, and refined. Most importantly, it has been used effectively to improve the efficiency of the overall operation and, thereby, significantly reduce costs.

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Gao, Song, Hongxiang Yan, Nathan Beirne, Mark Wigmosta, and Michael Huesemann. "Improving Microalgal Biomass Productivity Using Weather-Forecast-Informed Operations." Cells 11, no. 9 (April 29, 2022): 1498. http://dx.doi.org/10.3390/cells11091498.

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The operation of microalgal cultivation systems, such as culture dilution associated with harvests, affects biomass productivity. However, the constantly changing incident light and ambient temperature in the outdoor environment make it difficult to determine the operational parameters that result in optimal biomass growth. To address this problem, we present a pond operation optimization tool that predicts biomass growth based on future weather conditions to identify the optimal dilution rate that maximizes biomass productivity. The concept was tested by comparing the biomass productivities of three dilution scenarios: standard batch cultivation (no dilution), fixed-rate dilution (harvest 60% of the culture every three days), and weather-forecast-informed dilution. In the weather-forecast-informed case, the culture was diluted daily, and the dilution ratio was optimized by the operation optimization tool according to the future 24 h weather condition. The results show that the weather-forecast-informed dilution improved the biomass productivity by 47% over the standard batch cultivation and 20% over the fixed-rate dilution case. These results demonstrate that the pond operation optimization tool could help pond operators to make decisions that maximize biomass growth in the field under ever-changing weather conditions.

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Eyitayo Oguntade, Adegboyega, Temitope Enitan Fatunmbi, and Joshua Adio Folayan. "Productivity of Timber Processing in Ondo State, Nigeria." Sustainable Agriculture Research 2, no. 1 (August 5, 2012): 1. http://dx.doi.org/10.5539/sar.v2n1p1.

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This study is aimed at evaluating the efficiency of timber processors in Ondo State, Nigeria, using Data Envelopment Analysis. Multi stage sampling technique was used to select two Local Government Areas with the highest number of sawmills, from each of which twenty saw millers were randomly selected, given a total of forty saw millers. Based on Constant Return to Scale Technical Efficiency, 35% of the saw millers were technically efficient while on the basis of Variable Return to Scale TE, 60% of the saw millers were technically efficient. About 35% of the saw millers were scale efficient. The Data Envelopment Analysis output revealed that 35% of the sampled saw millers were both technically and scale efficient and were hence operating at the most productive scale size. About 65% of the saw millers were operating at sub-optimal condition. Excesses in input utilization were observed in respect of total fixed cost, costs of electricity, servicing of mill, timber from forest reserve and operation of truck; and remuneration of labour. The inefficient firms should be encouraged to emulate the operating practices of the most productive firms so as to improve their performance.

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Ezzati, Sättar, Farzam Tavankar, Mohammad Reza Ghaffariyan, Rachele Venanzi, Francesco Latterini, and Rodolfo Picchio. "The Impact of Weather and Slope Conditions on the Productivity, Cost, and GHG Emissions of a Ground-Based Harvesting Operation in Mountain Hardwoods." Forests 12, no. 12 (November 23, 2021): 1612. http://dx.doi.org/10.3390/f12121612.

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Mountainous hardwood mixed stands offer challenges to timber harvesting operations in practice, including a harsh climate, variable topography, steep terrain, and large-sized timbers. This paper aims to develop productivity and cost models for a mountain-ground-based harvesting operation across the terrain (e.g., slope conditions), stand (e.g., tree volume) environmental (e.g., weather), and yard (e.g., winching distance) variables and to assess GHG emissions related to the equipment in use. This development was implemented in a timber harvesting practice under single-tree selection in mountainous forests of Iran where a motor-manual chainsaw is used for felling and a rubber-tired cable skidder is used for log extraction. The average delay-free productivity was 4.55 m3 for felling and 14.73 m3 h−1 for skidding. Lower production costs and higher productivity rates were observed over the gentle slopes and in sunny conditions. The average production costs ranged between USD 4.27 m−3 for felling and USD 5.35 m−3 for skidding. The average emissions ranged between 0.96 kg m−3 for felling and 7.06 kg m−3 for skidding in snowy conditions over steep slopes. The study’s results confirm avoiding harvesting operations on steep slopes (greater than 35%) and in extreme weather conditions to obtain higher work efficiency and to minimize adverse effects of machinery on forest ecosystems. The results should be of use to harvest managers and forest planners considering the application of ground-based harvesting operations using a semi-mechanized system on a range of operating conditions in mountain hardwood stands.

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Kumar, C. N. Ashok. "A Study on the Effective Die Design in Sheet Metal Forming to Improve the Productivity." Applied Mechanics and Materials 592-594 (July 2014): 806–10. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.806.

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Productivity is one of the major factors that affect the profit of any industry or any product. In manufacturing industries, the productivity is showing the efficiency of the production unit. It depends on many factors such as technology, machine, method, management etc. In this study, method of manufacturing is considered and analyzed how it affects the productivity. Productivity is normally expressed as the number of units produced / unit time. Sheet metal forming is one of the major manufacturing processes and used for most of the products. The proper design of die is important in sheet metal forming processes. This article discusses how the Combination Die can improve the productivity. For this study, a product “U Clamp” is considered. The Product requires piercing, bending and parting off operations. The Combination Die is designed and fabricated for the product and tested. Data on operation time, material handling time are collected, analyzed and discussed.

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Chen, Shu-Chuan, Da-Sheng Lee, and Chien-Yi Huang. "Evaluating the Sustainable Operating Performance of Electronics Industry Groups: Taiwanese Firms in Mainland China." Sustainability 13, no. 21 (October 31, 2021): 12030. http://dx.doi.org/10.3390/su132112030.

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Mainland China’s economy is growing rapidly, with China-made electronic products selling around the world. Taiwan’s electronics groups running operations or production locations in Mainland China have performed strongly in recent years. At one time more than 90% of the world’s laptops were manufactured by Taiwanese makers, largely in China. This study assessed the sustainability operating performance of the top 20 Taiwanese electronic groups (including 272 companies) with an average of 38 years of sustained operation in China, using the Data Envelopment Analysis Method (DEA) to measure the performance and operating efficiency of the group as a whole, with net operating revenue and pre-tax profit margin as the output elements, and total assets, capital, and total expenses as input elements, to assess whether changes in operating performance and productivity over the three-year period (2018–2020) are significant. The results showed that two Taiwanese electronics groups (Quanta Computer and Catcher Technology) were relatively efficient during the study period and that the overall productivity of the electronics groups was in a state of sustainability. This study uses the industrial cluster viewpoint to evaluate the sustainability operating performance of the groups. Results show that using DEA for performance evaluation is both comprehensive and practical. The findings of this study may be used as a reference in creating sustainable operations and improving a firm’s production efficiency through the evaluation of firm resource allocation.

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ISHIKAWA, Mineo. "High-intensive Operation and Productivity Increase in Flash Smelting Furnace Operation at Saganoseki Smelter & Refinery." Shigen-to-Sozai 114, no. 7 (1998): 447–54. http://dx.doi.org/10.2473/shigentosozai.114.447.

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Smirnov, M. B., and G. B. Abdilova. "Ways of improvement of technological equipment performance." Theory and practice of meat processing 6, no. 1 (April 28, 2021): 87–96. http://dx.doi.org/10.21323/2414-438x-2021-6-1-87-96.

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Increasing of production performance of production systems and equipment in the meat-processing industry is integrally linked to maintenance activities. The article analyzes the influence of technological effectiveness, level of hygiene, reliability and simplicity of equipment design on the main parameters of meat products quality. Here it is shown that the strategy of Total Productive Maintenance (TRM) and Lean production is important tool for assessment of parameter of the Overall Equipment Effectiveness (OEE), which is used to assess the main types of losses that reduce the equipment productivity. The link of influence between the structural and mechanical properties of food masses, the moisture content of the initial food raw material, the temperature and viscosity, the processing pressure, and the density for the optimal operating terms of the equipment are analyzed in this research. With the help of OEE concept, the time losses related to the features of the equipment functioning are determined. The types of losses are classified as follows: downtime and readjustment (availability or readiness for operation) of equipment, short-term shutdown of equipment and a decrease in processing speed (productivity or performance rate of the equipment), product rejects and product losses (quality losses) during startup of equipment. While analyzing of the operation of vacuum filler for sausages production, the values of parameters of equipment availability, it productivity and product quality are calculated. The availability index is 0.79, the productivity index is 0.76, and the product quality index is 0.95. Taking into account the obtained data on equipment availability, productivity and product quality, it is determined that the overall equipment effectiveness (OEE) accounts for 57%. The application of this method for studying the overall equipment effectiveness operation can be applied to any technological equipment used in the meat-processing industry and allows eliminating many problems that arise during the operation of technological equipment, improving its technical and economic parameters, and developing a system of measures for improvement of its maintenance and repair.

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Koval’ova, Iryna. "DEVICE FOR INCREASING THE PRODUCTIVITY OF MILLING MACHINE OPERATION WITH CNC MCV-1000." ENGINEERING, ENERGY, TRANSPORT AIC, no. 3(106) (November 27, 2019): 73–79. http://dx.doi.org/10.37128/2520-6168-2019-3-9.

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Тhe work of the milling machine with the CNC MCV-1000 is considered. A device that significantly improves the productivity of this machine when performing the operation of milling round holes along the outer surface of the pipe with a certain step is shown. The results obtained by experimental means are indicated. Analysis of current trends in the development of machine tool industry indicates the need to increase the technical level of metalworking equipment with developed complexes of technological operations. A significant role is played by the equipment of metalworking machines, namely, specialized devices for various types of processing. The goal is to increase metalworking productivity. As a result of the analysis of existing devices revealed their advantages and disadvantages. A new design of the device for the simultaneous processing of four pipes with a length of up to 1000 mm and a diameter of 32 mm on a MCV-1000 CNC milling machine is proposed. This device is designed for reliable fixation of four pipes simultaneously for the operation of milling round holes along the outer surface of the pipe with a certain step. The introduction of this device showed a double increase in productivity compared with the previous device, which was used at the enterprise.

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Pasi, Bhaveshkumar N., Subhash K. Mahajan, and Santosh B. Rane. "A Method for Performing Forging Operation: A Perspective of Industry 4.0." Recent Patents on Mechanical Engineering 14, no. 3 (August 9, 2021): 423–35. http://dx.doi.org/10.2174/2212797614666210120110548.

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Background: Cold forging operation is done on small as well as large scale in manufacturing industries. These industries are facing problems such as higher rejection rate of the final product, low productivity, the high number of accidents during production, etc. Objective: The purpose of this research work is to develop a Voice-Assisted Forging System (VAFS) with a lower rejection rate, higher productivity, and lower number of accidents during production. Methods: Based on recently published journals and patents, traditional and automatic forging operations, Industry 4.0, and voice assisted systems are reviewed and VAFS is designed and developed. Then, the trial is taken on VAFS to investigate its performance. Finally, limitations and future research of the VAFS are proposed. Results: It is found that after implementation of the VAFS the average rejection count is reduced by 90.3 percentage, the operational productivity is increased by 71.2 percentage, and process accuracy is increased from 92.75 percentage to 99.30 percentage. Also, the number of accidents is reduced to zero. In comparison with the manual forging operation, the VAFS occupies less space, and it is easy to operate. Conclusion: This system will help the workers as well as the owner of industries to create a better man and machine relationship and to have a human-friendly working environment. VAFS reduces exhaustion and hassle of employees, components rejection, and energy consumptions in the production line.

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Sembiring, Nurhayati, and Novita Sari Br Purba. "Analysis of company operating feasibility using Energy Productivity Ratio (EPR)." E3S Web of Conferences 73 (2018): 08011. http://dx.doi.org/10.1051/e3sconf/20187308011.

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This research is conducted in a company engaged in the manufacture of pesticides. The company has never measured it's energy productivity. The company is only based on production targets and financial benefits achieved each year. One method that can be used in productivity measurement and operational feasibility is Energy Productivity Ratio (EPR). EPR is expressed as the ratio of energy output to the energy input. The feasibility of the company's operation can be seen from the energy productivity value. The purpose of research conducted to 1) Measure the level of energy productivity 2) Measuring the feasibility of the company's operations 3) Identify the factors that influence the value of energy productivity ratio (EPR) and 4) Provide proposed steps to increase energy productivity. EPR is made by collecting data on material requirements, power requirements, machine and equipment data and the number of products produced. After doing the calculation of energy input and energy output, the final step is to calculate the value of Energy Productivity Ratio (EPR). By this research we know the company is feasible to operate because the value of EPR> 1, although it must be repaired to increase the value.

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Seo, Kyoung-Soo, and Hyun-Soo Han. "Study on Operation Productivity of Urban Railway Trains: Focus on Effects of Train Failure on Malmquist Productivity." Journal of the Korean Society for Railway 23, no. 9 (September 30, 2020): 809–20. http://dx.doi.org/10.7782/jksr.2020.23.9.809.

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