Relevant bibliographies by topics / Bottlenecks

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Bottlenecks'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 June 2025

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Journal articles on the topic "Bottlenecks"

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Brock, Ryan E., Liam P. Crowther, David J. Wright, et al. "No severe genetic bottleneck in a rapidly range-expanding bumblebee pollinator." Proceedings of the Royal Society B: Biological Sciences 288, no. 1944 (2021): 20202639. http://dx.doi.org/10.1098/rspb.2020.2639.

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Genetic bottlenecks can limit the success of populations colonizing new ranges. However, successful colonizations can occur despite bottlenecks, a phenomenon known as the genetic paradox of invasion. Eusocial Hymenoptera such as bumblebees (Bombusspp.) should be particularly vulnerable to genetic bottlenecks, since homozygosity at the sex-determining locus leads to costly diploid male production (DMP). The Tree Bumblebee (Bombus hypnorum) has rapidly colonized the UK since 2001 and has been highlighted as exemplifying the genetic paradox of invasion. Using microsatellite genotyping, combined with the first genetic estimates of DMP in UKB. hypnorum, we tested two alternative genetic hypotheses (‘bottleneck’ and ‘gene flow’ hypotheses) forB. hypnorum's colonization of the UK. We found that the UK population has not undergone a recent severe genetic bottleneck and exhibits levels of genetic diversity falling between those of widespread and range-restrictedBombusspecies. Diploid males occurred in 15.4% of reared colonies, leading to an estimate of 21.5 alleles at the sex-determining locus. Overall, the findings show that this population is not bottlenecked, instead suggesting that it is experiencing continued gene flow from the continental European source population with only moderate loss of genetic diversity, and does not exemplify the genetic paradox of invasion.
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Veltman, Mark, Robert Kooij, and Sebastian Marban. "Sales Bottlenecks And Their Effect On Profit." Journal of Applied Business Research (JABR) 30, no. 6 (2014): 1725. http://dx.doi.org/10.19030/jabr.v30i6.8889.

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This study introduces the term sales bottleneck, defined as a stage in a total production or service delivery process that limits sales. After analyzing the suitability of traditional methods to find sales bottlenecks, the study proposes the bottleneck accounting model as a method to determine sales bottlenecks and calculate the effect of each of these bottlenecks on profit. Analytical verification shows that this method finds all sales bottlenecks and determines the exact effect on profit. Finally, the methods effectiveness is tested in practice by means of a case study performed within the Rabobank.
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Deselnicu, Oana, and Jason Wallis. "A Framework for Identifying Recurring Bottlenecks in the State Planning Process in Colorado." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 51 (2018): 20–30. http://dx.doi.org/10.1177/0361198118792767.

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Traditional methods used in transportation planning to identify bottlenecks and mobility issues, such as the Volume-to-Capacity Ratio and the Planning Time Index, have limited usefulness in identifying the exact location and extent of bottlenecks. Moreover, existing bottleneck identification tools flag all bottleneck types without distinction, despite the fact that strategies and resources used to address each type are different. This research first proposes a taxonomy of congestion to distinguish between different types of bottlenecks. It then describes a new methodology for identifying the location of recurring bottlenecks. Recurring bottleneck locations must experience a reduction in speed, an upstream accumulation of vehicles, and recurrence at the same location over three consecutive months. The methodology is currently used in long-term transportation planning and project selection in Colorado to identify and address the most severe bottleneck locations in the state.
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Whittaker, Michael, Ailidani Ailijiang, Aleksey Charapko, et al. "Scaling replicated state machines with compartmentalization." Proceedings of the VLDB Endowment 14, no. 11 (2021): 2203–15. http://dx.doi.org/10.14778/3476249.3476273.

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State machine replication protocols, like MultiPaxos and Raft, are a critical component of many distributed systems and databases. However, these protocols offer relatively low throughput due to several bottlenecked components. Numerous existing protocols fix different bottlenecks in isolation but fall short of a complete solution. When you fix one bottleneck, another arises. In this paper, we introduce compartmentalization, the first comprehensive technique to eliminate state machine replication bottlenecks. Compartmentalization involves decoupling individual bottlenecks into distinct components and scaling these components independently. Compartmentalization has two key strengths. First, compartmentalization leads to strong performance. In this paper, we demonstrate how to compartmentalize MultiPaxos to increase its throughput by 6× on a write-only workload and 16× on a mixed read-write workload. Unlike other approaches, we achieve this performance without the need for specialized hardware. Second, compartmentalization is a technique, not a protocol. Industry practitioners can apply compartmentalization to their protocols incrementally without having to adopt a completely new protocol.
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Captain, Gospel Otto, and Ipalibo Robert. "Models for Predicting Speed at Bottleneck Locations where the Flow Rate is Greater than the Bottleneck in Port Harcourt City." Models for Predicting Speed at Bottleneck Locations where the Flow Rate is Greater than the Bottleneck in Port Harcourt City 9, no. 1 (2024): 9. https://doi.org/10.5281/zenodo.10499914.

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Numerous measures are being implemented to address transportation challenges in Port Harcourt, a rapidly growing city with a high population in Nigeria. The city experiences heavy traffic congestion, especially on major link roads, leading to significant delays due to the bottlenecks caused by reckless parking, construction work, and other factors. To analyse speed at bottlenecks, experts apply the Lighthill Theory, a rigorous process determining speed. Bottlenecks refer to areas in the road network where traffic flow is hindered, resulting in congestion and decreased speeds. Accurately modelling speed in the presence of bottlenecks is critical to understanding traffic dynamics and developing effective strategies to manage congestion. A study was conducted at 34 locations with bottlenecks caused by various factors, including road construction, merging lanes, road capacity limitations, accidents, and vehicle breakdowns. Using Eureqa software, the project developed models that can easily calculate the speed at bottlenecks. The maximum error in predicting speeds before, at, and after the bottleneck is 0.288, 0.241, and 4.235, respectively. The mean squared error of speeds before, at, and after the bottleneck is 0.01048, 0.00908, and 0.858, respectively. These results demonstrate that the models are relatively accurate in predicting speeds at different stages of bottlenecks. The speed models gave R2 values of 0.99125, 0.9977, and 0.97524 for speed before, at, and after the bottleneck, respectively, with a correlation coefficient value (r) of 0.99563, 0.99887, and 0.9883. Keywords:- Model, Congestion, Traffic Flow, Bottleneck, Intersection.
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Lawrence, Stephen R., and Arnold H. Buss. "Economic analysis of production bottlenecks." Mathematical Problems in Engineering 1, no. 4 (1995): 341–63. http://dx.doi.org/10.1155/s1024123x95000202.

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The management of bottlenecks has become a central topic in the planning and control of production systems. In this paper, we critically analyze bottlenecks from an economic perspective. Using a queueing network model, we demonstrate that bottlenecks are inevitable when there are differences in job arrival rates, processing rates, or costs of productive resources. These differences naturally lead to the creation of bottlenecks both for facilities design and demand planning problems. To evaluate bottlenecks from an economic perspective, we develop the notion of an “economic bottleneck,” which defines resources as bottlenecks based on economic, rather than physical, characteristics.
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Kim, Geon-Hwan, Yeong-Jun Song, Imtiaz Mahmud, and You-Ze Cho. "Adaptive Decrease Window for BALIA (ADW-BALIA): Congestion Control Algorithm for Throughput Improvement in Nonshared Bottlenecks." Electronics 10, no. 3 (2021): 294. http://dx.doi.org/10.3390/electronics10030294.

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The main design goals of the multipath transmission control protocol (MPTCP) are to improve the throughput and share a common bottleneck link fairly with a single-path transmission control protocol (TCP). The existing MPTCP congestion control algorithms achieve the goal of fairness with single-path TCP flows in a shared bottleneck, but they cannot maximize the throughput in nonshared bottlenecks, where multiple subflows traverse different bottleneck links. This is because the MPTCP is designed not to exceed the throughput of a single-path TCP competing in the bottleneck. Therefore, we believe that MPTCP congestion control should have different congestion window control mechanisms, depending on the bottleneck type. In this paper, we propose an adaptive decrease window (ADW) balanced linked adaptation (BALIA) congestion control algorithm that adaptively adjusts the congestion window decrease in order to achieve better throughput in nonshared bottlenecks while maintaining fairness with the single-path TCP flows in shared bottlenecks. The ADW-BALIA algorithm detects shared and nonshared bottlenecks based on delay fluctuations and it uses different congestion window decrease methods for the two types of bottleneck. When the delay fluctuations of the MPTCP subflows are similar, the ADW-BALIA algorithm behaves the same as the existing BALIA congestion control algorithm. If the delay fluctuations are dissimilar, then the ADW-BALIA algorithm adaptively modulates the congestion window reduction. We implement the ADW-BALIA algorithm in the Linux kernel and perform an emulation experiment that is based on various topologies. ADW-BALIA improves the aggregate MPTCP throughput by 20% in the nonshared bottleneck scenario, while maintaining fairness with the single-path TCP in the shared bottleneck scenario. Even in a triple bottleneck topology, where both types of bottlenecks exist together, the throughput increases significantly. We confirmed that the ADW-BALIA algorithm works stably for different delay paths, in competition with CUBIC flows, and with lossy links.
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Ahmed, Ishtiak, Nagui M. Rouphail, and Shams Tanvir. "Characteristics and Temporal Stability of Recurring Bottlenecks." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 42 (2018): 235–46. http://dx.doi.org/10.1177/0361198118798991.

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This study applies and updates a method which identifies and quantifies the extent of traffic congestion from recurring freeway bottlenecks. Additionally, the spatiotemporal stability of bottlenecks over an extended period was tested. Over time congestion at bottlenecks may increase, may decrease, or may migrate to other nearby locations. Analysis of stability is important since prioritizing and applying treatments at bottlenecks is a multiyear process. In addition, a robust method for selecting sensitivity based parameters to identify and quantify bottleneck effects is presented. Subsequently, a systematic framework is developed for tracking and archiving the spatiotemporal changes in the recurring bottlenecks. The proposed method is demonstrated on a case study on Interstate 40 in North Carolina using three years of probe data. A congestion speed ratio detection threshold of 0.7 and a probability of activation threshold of 33% for the study area were determined from a sensitivity test to ascertain their recurrence. The method identified 13 bottlenecks with their impacts ranging from 35 to 3,278 mi-hours of congestion per year. Eight bottlenecks either newly emerged or had their queues merged or shifted between successive years. Even spatially stable bottlenecks had significant variation in their activation frequency and queue length. Exploration of the changes in bottleneck severity and locations revealed the influence of a long-term work zone in the area and the effect of the rapid growth in traffic demand. Local agencies can use this method to shortlist recurring bottlenecks and track changes to plan mitigation strategies.
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Tang, Li, Yifeng Wang, and Xuejun Zhang. "Identifying Recurring Bottlenecks on Urban Expressway Using a Fusion Method Based on Loop Detector Data." Mathematical Problems in Engineering 2019 (August 18, 2019): 1–9. http://dx.doi.org/10.1155/2019/5861414.

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The accurate identification of recurrent bottlenecks has been an important assumption of many studies on traffic congestion analysis and management. As one of the most widely used traffic detection devices, loop detectors can provide reliable multidimensional data for traffic bottleneck identification. Although great efforts have been put on developing bottleneck identification methods based on loop detector data, the existing studies are less informative with respect to providing accurate position of the bottlenecks and discussing the algorithm efficiency when facing with large amount of real-time data. This paper aims at improving the quality of bottleneck identification as well as avoiding excessive data processing burden. A fusion method of loop detector data with different collection cycles is proposed. It firstly determines the occurrence and the approximate locations of bottlenecks using large cycle data considering its high accuracy in determining bottlenecks occurrence. Then, the small cycle data are used to determine the accurate location and the duration time of the bottlenecks. A case study is introduced to verify the proposed method. A large set of 30 s raw loop detector data from a selected urban expressway segment in California is used. Also, the identification result is compared with the classical transformed cumulative curves method. The results show that the fusion method is valid with bottleneck identification and location positioning. We finally conclude by discussing some future improvements and potential applications.
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Lei, Qi, and Tong Li. "Identification approach for bottleneck clusters in a job shop based on theory of constraints and sensitivity analysis." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 6 (2015): 1091–101. http://dx.doi.org/10.1177/0954405415583884.

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Manufacturing systems are constrained by one or more bottlenecks. Reducing bottlenecks improves the entire system. Finding bottlenecks, however, is a difficult task. In this study, a new bottleneck detection method based on theory of constrains and sensitivity analysis is presented to overcome the disadvantages of existing bottleneck identification methods for a job shop. First, a bottleneck index matrix is obtained by examining the sensitivity of system production performance to the capacity of each machine. Technique for order preference by similarity to ideal solution is then employed to calculate the comprehensive bottleneck index of each machine. Based on the calculation result, bottleneck machine clusters under different hierarchies are obtained through hierarchical cluster analysis. The designed identification approach, as a prior-to-run method, can identify bottleneck machine clusters under different hierarchies before the overall system circulation, thereby providing good guidance for subsequent production optimization. Finally, a set of job-shop scheduling problem benchmarks with different scales is selected for comparison between the proposed approach and existing approaches, such as, the shifting bottleneck detection method, the bottleneck detection method based on orthogonal experiment, and the bottleneck cluster identification method. By comparison, the proposed approach is proven to be credible and superior.
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Dissertations / Theses on the topic "Bottlenecks"

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Kahraman, Muhammet Mustafa. "Holistic Mine Management By Identification Of Real-Time And Historical Production Bottlenecks." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/566211.

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Mining has a long history of production and operation management. Economies of scales have changed drastically and technology has transformed the mining industry significantly. One of the most important technological improvements is increased equipment, human, and plant tracking capabilities. This provided a continuous data stream to the decision makers, considering dynamic operational conditions. However, managerial approaches did not change in parallel. Even though many process improvement tools using equipment/human/plant tracking capabilities were developed (Fleet Management Systems, Plant Monitoring Systems, Workforce Management Systems etc.), to date there is no holistic approach or system to manage the entire value chain in mining. Mining operations are designed and managed around the already known system designated bottlenecks. However, contrary to common belief in mining, bottlenecks are not static. They can shift from one process or location to another. It is important for management to be aware of the new bottlenecks, since their decisions will be effected. Therefore, identification of true bottlenecks in real-time will help tactical level decisions (use of buffers, resource transfer), and identification of historical bottlenecks will help strategic-level decisions (investments, increasing capacity etc.). This thesis aims to address the managerial focus on the true bottlenecks. This is done by first identifying and ranking true bottlenecks in the system. The study proposes a methodology for creating Bottleneck Identification Model (BIM) that can identify true bottlenecks in a value chain in real-time or historically, depending on the available data. This approach consists of three phases to detect and rank the bottlenecks. In the first phase, the system is defined and variables are identified. In the second phase, the capacity, rates, and buffers are computed. In the third phase, considering particularities of the mine exceptions are added by taking mine characteristics into account, and bottlenecks are identified and ranked.
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Svensson, André, and Gustav Lenart. "Controlling Traffic With Moving Bottlenecks." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293833.

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Traffic shockwaves are a regularly occurring phe-nomenon in traffic that are a source of irritation and delaysfor the road users. One type of shockwave is the stop-and-gowave which forces entering drivers to stop and advance slowlyuntil the wave is passed. This project aims to design a controlalgorithm through the use of models and simulations to increasethe rate at which a stop-and-go wave dissipates. To design themodel and algorithm the Simulation of Urban MObility (SUMO)simulator and the Traffic Control Interface (TraCI) were usedin conjunction with Python. The setup used for simulation wasthat of a one way, two lane highway with an artificially inducedstop-and-go wave.The designed algorithm manages to dissipate a stop-and-go wavecompletely without introducing new ones.<br>Trafikvågorär ett vanligt förekommandefenomen i trafiken vilketär en orsak till frustration ochförseningar. En typ av vågär startochstop vågen som tvingarförare att stanna och långsamt fortsätta genom vågen tills denpasserat. Målet med detta projektär att utveckla en kontrol-lalgoritm med hjälp av modeller och simuleringar för attökaavtagandet av en sådan våg. För att utveckla modellen ochalgoritmen används simulatorn Simulation of Urban MObility(SUMO) och Traffic Control Interface (TraCI) i kombinationmed programmeringsspråket Python. Simulering gjordes på ettnätverk bestående av en enkelriktad, tvåfilig motorväg med enkonstgjord startochstop våg.En algoritm utvecklades som kan skingra en startochstop vågutan att skapa nya.<br>Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
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Rosqvist, Åkerblom Linn. "JavaScript Performance and Optimization : Removing bottlenecks." Thesis, Mittuniversitetet, Avdelningen för data- och systemvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-25474.

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Cavka, Hasan Burak. "Characterizing bottlenecks in building design coordination meetings." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23331.

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This thesis describes an ethnographic field study that examined the design coordination process in two building projects. The goal of the study was to better understand the challenges faced by project teams as they coordinate designs in multi-disciplinary meeting environments. I focus on the bottlenecks encountered during in-person and distributed project coordination meetings. I observed meeting bottlenecks when meeting activities were performed inefficiently, when the meeting process was slowed down, when meeting workflow was interrupted, or when decision-making was hindered. I identified and characterized meeting bottlenecks in a framework that illustrates the nature of the bottleneck, and the frequency of its occurrence. According to my observations, there were two main categories of causes for bottlenecks in coordination meetings: context-based bottlenecks and content-based bottlenecks. Context-based bottlenecks are caused by the people in the design team, the meeting environment and the meeting technology. Content-based bottlenecks are related to the nature of the information artifacts (e.g., drawings and other design information) and the interactions with these artifacts (e.g., navigation and annotation). This study also provides an analysis of the frequency and patterns of various bottlenecks encountered in different meeting settings. For example, in paper-based meetings, there were more “interaction/ access” bottlenecks observed since the meeting activities involved the use of information artifacts and the participants’ interaction with these artifacts. In distributed meetings, the larger number of meeting bottlenecks was observed under the “technology” bottlenecks group. Therefore, this analysis illustrates the specific requirements for different meeting settings. This study enhances our understanding of the work practice of project teams in design coordination meetings. It highlights the many ways that meeting efficiency could be improved for design teams in coordination meetings. By using the vignettes in this study, people from different domains can understand the nature of the meeting processes, the techniques used by project teams when coordinating designs, and the different methods used by meeting participants to interact with information artifacts. My hope is that these findings will inform the design of new interaction, visualization, and integration technologies that better support the meeting processes of design teams.
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Gomez, Michael. "Ghosts and bottlenecks in elastic snap-through." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:11ab7b19-ee4b-4cd6-ac9a-116363a4e4d7.

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Snap-through is a striking instability in which an elastic object rapidly jumps from one state to another. It is seen in the leaves of the Venus flytrap plant and umbrellas flipping on a windy day among many other examples. Similar structures that snap-through are used to generate fast motions in soft robotics, switches in micro-scale electronics and artificial heart valves. Despite the ubiquity of snap-through in nature and engineering, its dynamics is usually only understood qualitatively. In this thesis we develop analytical understanding of this dynamics, focussing on how the mathematical structure underlying the snap-through transition controls the timescale of instability. We begin by considering the dynamics of 'pull-in' instabilities in microelectromechanical systems (MEMS) - a type of snap-through caused by electrostatic forces in which the motions are dominated by fluid damping. Using a lumped-parameter model, we show that the observed time delay near the pull-in transition is a type of critical slowing down - a so-called 'bottleneck' due to the 'ghost' of a saddle-node bifurcation. We obtain a scaling law describing this slowing down, and, in the process, unify a large range of experiments and simulations that exhibit delay phenomena during pull-in. We also investigate the pull-in dynamics of MEMS microbeams, extending the lumped-parameter approach to incorporate the details of the beam geometry. This provides a model system in which to understand snap-through of a continuous elastic structure due to external loading. We develop a perturbation method that systematically exploits the proximity to pull-in to reduce the governing equations to a simpler evolution equation, with a structure that highlights the saddle-node bifurcation. This allows us to analyse the bottleneck dynamics in detail, which we compare with previous experimental and numerical data. The remainder of the thesis is concerned with the dynamics of snap-through in macroscopic systems. In particular, we explore the extent to which dissipation is required to explain anomalously slow snap-through. Considering an elastic arch as an archetype of a snapping system, we use the perturbation method developed earlier to show that two bottleneck regimes are possible, depending delicately on the relative importance of external damping. In particular, we show that critical slowing down occurs even in the absence of damping, leading to a new scaling law for the snap-through time that is confirmed by elastica simulations and experiments. In many real systems material viscoelasticity is present to some degree. Finally, we examine how this influences the snap-through dynamics of a simple truss-like structure. We present a regime diagram that characterises when the timescale of snap-through is controlled by viscous, elastic or viscoelastic effects.
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Pesterev, Aleksey. "Locating cache performance bottlenecks using data profiling." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58183.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 47-48).<br>Effective use of CPU data caches is critical to good performance, but poor cache use patterns are often hard to spot using existing execution profiling tools. Typical profilers attribute costs to specific code locations. The costs due to frequent cache misses on a given piece of data, however, may be spread over instructions throughout the application. The resulting individually small costs at a large number of instructions can easily appear insignificant in a code profiler's output. DProf helps programmers understand cache miss costs by attributing misses to data types instead of code. Associating cache misses with data helps programmers locate data structures that experience misses in many places in the application's code. DProf introduces a number of new views of cache miss data, including a data profile, which reports the data types with the most cache misses, and a data flow graph, which summarizes how objects of a given type are accessed throughout their lifetime, and which accesses incur expensive cross-CPU cache loads. We present two case studies of using DProf to find and fix cache performance bottlenecks in Linux. The improvements provide a 16-57% throughput improvement on a range of memcached and Apache workloads.<br>by Aleksey Pesterev.<br>S.M.
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Boyd-Wickizer, Silas. "Optimizing communication bottlenecks in multiprocessor operating system kernels." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87914.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 63-64).<br>One difficulty of programming multicore processors is achieving performance that scales with the number of cores in the system. A common performance optimization is to increase inter-core parallelism. If the application is sufficiently parallelized, developers might hope that performance would scale as core count increases. Unfortunately for some applications, such as operating system kernels, parallelization reveals inter-core communication as a performance bottleneck. When data is updated on one core and read or written on other cores, the cache coherence protocol serializes accesses to the data. The result is that each access to the shared data can take hundreds to thousands of cycles, depending on how many cores are contending for the data. This dissertation focuses on optimizing communication bottlenecks caused by update-heavy workloads, where a data structure is frequently updated but rarely read. Such data structures are commonly used for operating system kernel bookkeeping, such as LRU lists, reverse maps in virtual memory, and file system notification queues. This dissertation identifies bottlenecks in the Linux kernel caused by update-heavy data structures, presents a general approach for optimizing communication in update-heavy data structures, and presents a library called OpLog that embodies this approach and helps developers achieve good scalability for update-heavy data structures. OpLog achieves scalability by logging update operations in per-core logs, and combining the logs only when required by a read to the data structure. Measurements on a 48-core AMD server show that applying OpLog to update-heavy data structures in the Linux kernel significantly improves application performance under certain workloads.<br>by Silas Boyd-Wickizer.<br>Ph. D.
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Salinas, Rivas Sergio Fernando Pedro. "Public Works Tax Deduction: Bottlenecks and Improvement Proposal." Derecho & Sociedad, 2016. http://repositorio.pucp.edu.pe/index/handle/123456789/118174.

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This article describes and analyses the present conditions of the application of the Public Work Tax Deduction (PWTD) mechanism, identifying six main obstacles that difficult on a appreciable way his concrete implementation or the rate of it.For this purpose, this study has identify and analyze the 30 main highlights that conform the critical path of PWTD process, determining the actual times for his performance and comparing them with the legal times established on the PWTD actual law, and so with the optimal times reasonably according with the experience on the public management of similar work projects.<br>El presente artículo describe y analiza las condiciones actuales de la aplicación delmecanismo de Obras por Impuestos (OXI), identificando seis obstáculos principales que dificultan de manera apreciable su implementación concreta o la velocidad de la misma. Para efectos del presente estudio se han identificado y analizado los principales 30 hitos que conforman la ruta crítica del proceso OXI, determinando los tiempos reales para su cumplimiento y comparándolos con los tiempos legales establecidos en la normativa OXI actual, y con los tiempos óptimos estimados razonablemente de acuerdo a la experiencia en la gestión pública de proyectos similares.
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Monsees, Hendrik. "Overcoming major bottlenecks in aquaponics - A practical approach." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/18658.

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Aquaponik-Systeme stellen an sich einen sehr nachhaltigen, innovativen Ansatz für die zukünftige Lebensmittelproduktion dar. Allerdings hat sich bis heute noch kein flächendeckender, ökonomischer Erfolg eingestellt und wesentliche systemische Engpässe wurden wissenschaftlich nicht untersucht. Daher waren die Hauptziele dieser Dissertation, (I) sichere Nitratkonzentrationen in geschlossenen Kreislaufanlagen (RAS) zu ermitteln, unter denen optimales Wachstum und Tierwohl produzierter Tilapien gewährleistet ist, (II) die Evaluierung des besten Designkonzeptes für die optimale, kombinierte Produktion von Fisch und Pflanzen und (III) die allgemeine Effizienz bei der Wiederverwertung des Abwassers und der Nährstoffe aus dem Schlamm der mechanischen Filtrationseinheiten in aquaponischen Systemen zu erhöhen. Das Wachstum und die Gesundheit von Niltilapien (Oreochromis niloticus) wird durch hohe Nitratkonzentrationen (> 500 mgL-1 NO3--N) negativ beeinflusst. Nitratkonzentrationen, die für die Produktion von Pflanzen in aquaponischen Systemen (~ 200 mgL-1 NO3--N) optimal sind, haben keinen negativen Einfluss auf das Tierwohl. Entkoppelte Kreislaufsysteme sind bei einer professionellen aquaponischen Produktion von Fisch und Pflanzen zu bevorzugen. Bei der Produktion von Fisch ergab sich keinerlei Unterschied, jedoch wurde eine deutlich gesteigerte Tomatenproduktion von 36 % in entkoppelten Kreislaufsystemen erreicht. Die aerobe Mineralisation zeigte das beste Rückgewinnungpotential von Phosphat und nur geringe Nitratverluste und kann in der Gesamtheit eine deutliche Effizienzsteigerung aquaponischer Systeme zur Folge haben. Die Ergebnisse dieser Dissertation zeigen die Engpässe in der Aquaponik klar auf und liefern gleichzeitig Lösungsansätze, wie diese Hindernisse in Bezug auf das Nährstoff- und Ressourcenmanagement überwunden werden können. Dadurch kann die Nachhaltigkeit dieser Anlagen gesteigert und die Wahrscheinlichkeit des wirtschaftlichen Erfolges erhöht werden.<br>Aquaponics is the combination of fish production in aquaculture and hydroponic (soilless) production of crop plants. Despite of representing already a sustainable, innovative approach for future food production systems, aquaponics are still missing economic success and up to date major bottlenecks were not scientifically addressed. Therefore the main aims of this thesis were (I) to identify safe nitrate concentrations under which best growth and health status of tilapia can be guaranteed in aquaponics, (II) to evaluate the best design concept for an optimal combined production of fish and plants and (III) to increase the overall system efficiency by recycling waste water and nutrients deposited in the sludge of the mechanical filtration unit. The growth and health status of Nile tilapia (Oreochromis niloticus) is negatively affected by high nitrate concentrations (> 500 mgL-1 NO3--N) commonly reported for RAS. Nevertheless, optimal nitrate concentrations for plant production in aquaponic systems (~ 200 mgL-1 NO3--N) are not affecting fish welfare and allow for an efficient production of Nile tilapia. Decoupled aquaponics proved to be favorable for professional aquaponic production, whereas coupled systems were suboptimal for a combined production of fish and plants. There were no differences in fish production, whereas tomato production within the decoupled system was considerably increased by 36 %. Aerobic mineralization of phosphate revealed best phosphate recovery with only minor losses of nitrate. Recycling of water sludge mixture from clarifiers resulted in a substantial phosphor recovery, an increase in potassium and additional water savings. Conclusively, the results of this holistic thesis clearly revealed the bottlenecks in aquaponic technology and provided guidance in overcoming mayor obstacles in terms of optimized nutrient and resource management to increase the overall sustainability of these systems and improve production efficiency and profitability.
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Burrows, Ben Robert. "Do Severe Genetic Bottlenecks Lead to Greater Reproductive Failure?" Thesis, University of Canterbury. Biological Sciences, 2006. http://hdl.handle.net/10092/1344.

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It is generally accepted that populations which experience severe bottlenecks have a reduction in fitness. One of the most frequently reported fitness costs is increased hatching failure in bottlenecked populations of birds. The mechanism responsible for increased hatching failure is unknown. Research on other animals suggest that reduced population numbers cause unavoidable inbreeding that in turn leads to abnormalities in the gametes. In this thesis I examine some of the possible causes for increased hatching failure in severely bottlenecked populations of introduced birds in New Zealand. I look at three traits identified as a cause for infertility or hatching failure previously and determine whether there is a link with the size of a population s bottleneck. It is possible that reduced numbers of sperm reaching the site of fertilisation is a primary cause of hatching failure. I examined the perivitelline membrane of various species of introduced birds and counted the total number of sperm present to compare to how many would be expected in non-bottlenecked species. Although there was no relationship between the size of the bottleneck and the number of sperm present, all species had lower than expected sperm counts. In many species of mammals, a reduction in the quality of sperm is attributed to inbreeding depression bought about by genetic bottlenecks. I next compared the level of sperm abnormalities, variation in midpiece size sperm, and sperm motility with the size of the bottleneck each species passed through when introduced to New Zealand. There was no significant correlation between either the variation in midpiece size or sperm motility with bottleneck size. However, there was a trend for species that passed through more severe bottlenecks to have a slightly higher level of midpiece size and lower motility. Finally, I examined whether there was a link between abnormalities in the eggshell and the size of the respective bottleneck. There was no significant change in eggshell thickness or any change in the number of pores associated bottleneck size. However, there was a decreased number of round pores in severely bottlenecked species, although the consequences of this are unknown. My findings do not directly link a single cause for increased hatching failure in bottlenecked species of birds, but they do highlight the need for monitoring of reproductive traits in endangered species that have experienced a population bottleneck.
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Books on the topic "Bottlenecks"

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Evans, David C. Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6.

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Kohno, Hirotada, and Peter Nijkamp, eds. Potentials and Bottlenecks in Spatial Development. Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-87901-2.

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Bedi, Mohinder Singh. Fighting drug menace: Achievements and bottlenecks. Regency Publications, 1997.

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Lares-Mankki, Laura. Strategy implementation bottlenecks: Identification, analysis and removal. Lappeenranta University of Technology, 1994.

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J, Mabry T., and Plant Biotechnology; Research Bottlenecks for Commercialization and Beyond (1987 : University of Texas at Austin), eds. Plant biotechnology: Research bottlenecks for commercialization and beyond. IC2ș Institute, 1987.

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Oloruntimehin, B. Olatunji. Constitutional and legal bottlenecks to privatisation in Nigeria. Development Policy Centre, 2002.

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Margiotta, Richard A. Recurring traffic bottlenecks: A primer : focus on low-cost operational improvements. 2nd ed. Federal Highway Administration, 2009.

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Biran, Or. Data-Driven Solutions to Bottlenecks in Natural Language Generation. [publisher not identified], 2016.

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Ontiretse, Kgarebe, Fagbevegelsens senter for forskning, utredning og dokumentasjon (Norway), and Botswana National Productivity Centre, eds. Barriers and bottlenecks to productivity in Botswana: Selected papers. Botswana National Productivity Centre, 2002.

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Korbandy, Lawrence. South Sudan: The national security interest and economic bottlenecks. Rafiki for Printing & Publishing, 2018.

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Book chapters on the topic "Bottlenecks"

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Evans, David C. "Foveal Acuity." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_1.

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Evans, David C. "Encoding and Retrieval." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_10.

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Evans, David C. "Personality." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_11.

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Evans, David C. "Developmental Stages." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_12.

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Evans, David C. "Needs." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_13.

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Evans, David C. "Fun." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_14.

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Evans, David C. "Schedules of Reinforcement." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_15.

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Evans, David C. "Escalating Commitment." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_16.

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Evans, David C. "Approach Avoidance." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_17.

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Evans, David C. "Routes to Persuasion." In Bottlenecks. Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2580-6_18.

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Conference papers on the topic "Bottlenecks"

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Marfany, Marc Andreu, Alona Sakhnenko, and Jeanette Miriam Lorenz. "Identifying Bottlenecks of NISQ-Friendly HHL Algorithms." In 2024 IEEE International Conference on Quantum Computing and Engineering (QCE). IEEE, 2024. https://doi.org/10.1109/qce60285.2024.00041.

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Rajora, Manik, Pan Zou, and Steven Liang. "A Hybrid RF-GA Approach to Bottleneck Machine Diagnosis and Suggestion in Parallel Machine Job-Shop Scheduling." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8586.

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In this paper, a hybrid Random Forest-Genetic Algorithm approach to detect and solve bottleneck machine problems in parallel machine Job-shop scheduling is developed with the aim of minimizing the makespan and the additional cost. The drawbacks of the existing methods for diagnosing bottlenecks is that they either do not consider the severity of the bottleneck or they do not consider the existence of multiple bottlenecks. In the existing models for solving bottlenecks, the cost is not considered as an objective function and only shifting of bottlenecks is utilized to solve the bottleneck machine problem. This approach is not feasible if the maximum capacity of the workshop has been reached. In this paper, a Random Forest classification model is utilized to diagnose bottleneck machine with different severity where the severity of the machines on the shop floor can either be none, low, medium, or high. Due to the lack of historical data, the Random Forest algorithm is trained using bottleneck data generated by simulating several identical parallel machine Job-shop scheduling problems. The trained Random Forest algorithm is then used in conjunction with Genetic Algorithm for finding the optimal actions to be taken for the most severe bottlenecks machines in order to reduce the makespan and the additional cost by optimizing the number of additional parallel machines to be utilized and overtime hours for the most severe bottleneck machines. The two objectives, makespan and additional cost, are combined into a single objective value by the use of weight values. These weight values depend on severity of the most severe bottleneck machine. If the bottleneck severity is “high” then makespan has a higher weight value than cost, if the severity is “medium” then both cost and makespan are weighed equally, and if the severity is “low” then cost has a higher weight value than makespan. In order to show the validity of the proposed approach it is used for diagnosing and solving the bottleneck problems in three different identical parallel machine Job-shop scheduling case studies 1. 3 jobs with 6 machines 2. 5 jobs with 9 machines and 3. 5 jobs with 12 machines. By utilizing the proposed approach the makespan and cost were reduced by 19.0%, 24.5% and 25.4% in case studies 1, 2, and 3 respectively. The results show that the trained Random Forest algorithm was able to correctly diagnose the bottleneck machines and their severity and Genetic algorithm was able to find the optimal number of additional hours and additional machines for the most severe bottleneck machines on the shop floor.
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Lai, Xingjian, Huanyi Shui, and Jun Ni. "A Two-Layer Long Short-Term Memory Network for Bottleneck Prediction in Multi-Job Manufacturing Systems." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6678.

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Throughput bottlenecks define and constrain the productivity of a production line. Prediction of future bottlenecks provides a great support for decision-making on the factory floor, which can help to foresee and formulate appropriate actions before production to improve the system throughput in a cost-effective manner. Bottleneck prediction remains a challenging task in literature. The difficulty lies in the complex dynamics of manufacturing systems. There are multiple factors collaboratively affecting bottleneck conditions, such as machine performance, machine degradation, line structure, operator skill level, and product release schedules. These factors impact on one another in a nonlinear manner and exhibit long-term temporal dependencies. State-of-the-art research utilizes various assumptions to simplify the modeling by reducing the input dimensionality. As a result, those models cannot accurately reflect complex dynamics of the bottleneck in a manufacturing system. To tackle this problem, this paper will propose a systematic framework to design a two-layer Long Short-Term Memory (LSTM) network tailored to the dynamic bottleneck prediction problem in multi-job manufacturing systems. This neural network based approach takes advantage of historical high dimensional factory floor data to predict system bottlenecks dynamically considering the future production planning inputs. The model is demonstrated with data from an automotive underbody assembly line. The result shows that the proposed method can achieve higher prediction accuracy compared with current state-of-the-art approaches.
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Nagwani, Dheeraj, and Sara Al Katheeri. "Maximize Asset Utilization by Effectively Identifying and Removing Bottlenecks." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207473-ms.

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Abstract ADNOC Gas Processing Ruwais NGL Fractionation plant receives and fractionates the NGL produced in upstream gas processing plants. After operation of newly designed upstream NGL plants, composition of NGL feedstock has become richer in Ethane and Propane. Consequently, nameplate capacity were reduced by~25%. In view of future increased NGL production, nameplate capacity of fractionation trains needs to be re-instated. Alternatively, a new fractionation train needs to be installed to accommodate additional NGL. To explore the opportunity for maximum utilization for existing trains, in line with the ADNOC strategy of enhancing profitability and asset utilization, a technical study was conducted to increase the processing capacity back to original nameplate capacity with lighter NGL composition. This was to identify the potential bottlenecks in the facility and suggest debottlenecking options with a reasonable investment. The Technical study covers the following activities: Simulation: Rigorous process simulation including the licensor units of DEO/Propane amine units Adequacy checks and identification of bottlenecks: Line sizing adequacy check and detailed hydraulic evaluation of the major piping Equipment adequacy check Relief &amp; blowdown and flare system adequacy check Proprietary equipment/design evaluation of licensed units Adequacy check for In-line instruments like control valves, flow elements/transmitters, thermowells Rotating equipment adequacy checks performed with the concurrence from OEMs. Licensor Endorsement: Obtained the endorsement of AGRU licensor (Shell) for the increased flow rate with revised contaminant levels with recommendations of removing identified bottlenecks. Bottlenecks mitigation: Various options for bottleneck mitigation was studied and most optimum solution was selected to remove the identified bottleneck. The study has concluded that current capacity limitation was mainly due to bottlenecks in Ethane loop. Therefore, by mitigating the identified bottlenecks (i.e. replacing lines with bigger size, providing high performance trays, high performance internals, replacing few equipment's with new one etc.), the original nameplate capacity can be re-instated. The study concludes that increased NGL forecasted flow with lighter composition could be processed in existing Ruwais fractionation trains by doing minor modifications (as compared to new train). A capacity increase of ~25% was achieved with minimum investment and requirement of new fractionation train could avoided. If extensive adequacy studies are carried out to identify the bottlenecks, the capacity enhancement in existing facilities can be achieved with minimum investment and major cost for new plants/trains can be avoided.
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Medina Pérez, Loaiza. "Eliminating Bottlenecks in GPP Processes: Improving Documentation Flow." In Eliminating Bottlenecks in GPP Processes: Improving Documentation Flow. US DOE, 2023. http://dx.doi.org/10.2172/1993450.

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Shyamsundar, Prasanth. "Blueprints for Training Information Bottlenecks for Collider Analyses." In Blueprints for Training Information Bottlenecks for Collider Analyses. US DOE, 2024. http://dx.doi.org/10.2172/2426439.

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Hu, Ningning, Li (Erran) Li, Zhuoqing Morley Mao, Peter Steenkiste, and Jia Wang. "Locating internet bottlenecks." In the 2004 conference. ACM Press, 2004. http://dx.doi.org/10.1145/1015467.1015474.

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Li, Yang, Qing Chang, Xiaoning Jin, and Jun Ni. "Markov Decision Models for Optimal Decision Making in Bottlenecks Identification and Mitigation." In ASME 2015 International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/msec2015-9256.

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Existing methods for bottleneck detection can be categorized into two: methods based on stochastic analysis and methods based on data-driven analysis. The stochastic methods are accurate in estimating bottlenecks in long term, ignoring the current improvement opportunities, while the data-driven methods tend to do the opposite. In this paper, we develop an optimal policy to integrate the two methods based on Markov decision theory. The characterization of the optimal policy is provided. In addition, to implement the policy, the optimal frequency for carrying out bottleneck analysis is investigated. Numerical experiment is performed to validate the effectiveness of the optimal policy and compare it to the existing methods.
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Haronian, Dan. "Bottlenecks of opto-MEMS." In Symposium on Applied Photonics, edited by Richard R. A. Syms. SPIE, 2000. http://dx.doi.org/10.1117/12.397919.

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Huang, H. K., Shyhliang A. Lou, and Albert W. K. Wong. "PACS pitfalls and bottlenecks." In Medical Imaging 1997, edited by Steven C. Horii and G. James Blaine. SPIE, 1997. http://dx.doi.org/10.1117/12.274553.

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Reports on the topic "Bottlenecks"

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DellaVigna, Stefano, Woojin Kim, and Elizabeth Linos. Bottlenecks for Evidence Adoption. National Bureau of Economic Research, 2022. http://dx.doi.org/10.3386/w30144.

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Schembri, Philip, and Jillian O'Neel. Granta upload bottlenecks at LANL. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1881776.

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Hu, Ningning, Li E. Li, Zhuoqing M. Mao, Peter Steenkiste, and Jia Wang. Locating Internet Bottlenecks: Algorithms, Measurements, and Implications. Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada461104.

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Acemoglu, Daron, David Autor, and Christina Patterson. Bottlenecks: Sectoral Imbalances and the US Productivity Slowdown. National Bureau of Economic Research, 2023. http://dx.doi.org/10.3386/w31427.

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Burriel, Pablo, Iván Kataryniuk, Carlos Moreno Pérez, and Francesca Viani. New supply bottlenecks index based on newspaper data. Banco de España, 2023. http://dx.doi.org/10.53479/25166.

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We develop a new monthly indicator of supply bottlenecks using newspaper articles. The supply bottlenecks index (SBI) provides a consistent narrative of supply issues related to wars, natural disasters, strikes and, most recently, the COVID-19 pandemic. Innovations in the SBI have important macroeconomic implications: an increase in the SBI functions as a cost-push shock, decreasing industrial production and employment, and pushing prices up, so that monetary policy faces important trade-offs.
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Kamil, S., K. Yelick, W. T. Kramer, et al. Science Driven Supercomputing Architectures: AnalyzingArchitectural Bottlenecks with Applications and Benchmark Probes. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/890640.

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Kamil, S., K. Yelick, W. T. Kramer, et al. Science Driven Supercomputing Architectures: AnalyzingArchitectural Bottlenecks with Applications and Benchmark Probes. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/890678.

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Petrovich, Beatrice, Howard Rogers, Harald Hecking, Simon Schulte, and Florian Weiser. Future European Gas Transmission Bottlenecks in Differing Supply and Demand Scenarios. Oxford Institute for Energy Studies, 2017. http://dx.doi.org/10.26889/9781784670856.

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Njoroge, Brian M., Alice M. Mwangi, and Isabelle Michaud Letourneau. Assessing bottlenecks within Iron and Folic Acid Supplementation Delivery in Kenya. International Initiative for Impact Evaluation (3ie), 2021. http://dx.doi.org/10.23846/wp0039.

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Knetter, Michael. Is Price Adjustment Asymmetric?: Evaluating the Market Share and Marketing Bottlenecks Hypothesis. National Bureau of Economic Research, 1992. http://dx.doi.org/10.3386/w4170.

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