Global ETD Search

1	Increasing the robustness of a service in a complex information flow Johansson, Albin January 2019 (has links) In complex information flows where a lot of varied data is transmitted through many companies and divisions, incidents will occur. When Visma Spcs had an incident where invoices sent from Visma to Visma's customers were duplicated and the service meant to receive the transactions did not handle the duplicates properly. They decided that the receiver service was to be upgraded to prevent this incident from happening again, as well as fixing some other issues the service had had. Incidents like this one must be investigated and a solution must be implemented to decrease the likelihood that similar incidents will happen again. In this report, the reader will see examples on how this can be handled and the benefits of tackling technical debt, along with how much more complicated the solutions might get if the service is not allowed to be taken offline. Technical debt incident handling developer morale cloud service Zero Downtime Deployment Engineering and Technology Teknik och teknologier
2	Zero-Downtime Deployment in a High Availability Architecture : Controlled experiment of deployment automation in a high availability architecture Nilsson, Axel January 2018 (has links) Computer applications are no longer local installations on our computers. Many modern web applications and services rely on an internet connection to a centralized server to access the full functionality of the application. High availability architectures can be used to provide redundancy in case of failure to ensure customers always have access to the server. Due to the complexity of such systems and the need for stability, deployments are often avoided and new features and bug fixes cannot be delivered to the end user quickly. In this project, an automation system is proposed to allow for deployments to a high availability architecture while ensuring high availability. The purposed automation system is then tested in a controlled experiment to see if it can deliver what it promises. During low amounts of traffic, the deployment system showed it could make a deployment with a statistically insignificant change in error rate when compared to normal operations. Similar results were found during medium to high levels of traffic for successful deployments, but if the system had to recover from a failed deployment there was an increase in errors. However, the response time during the experiment showed that the system had a significant effect on the response time of the web application resulting in the availability being compromised in certain situations. High Availability Zero-Downtime Deployment Continuous Deployment Automation Computer Systems Datorsystem
3	Batch Reverse Osmosis: Improvements and New Applications Abhimanyu Das (17129545) 11 October 2023 (has links) <p dir="ltr">Reverse osmosis (RO) is emerging as the world’s leading desalination technology due to its superior energy efficiency and the shift towards renewable electrification. However, RO systems need to further improve efficiency, increase operating flux, reach higher salinities (>7.5% w.t.), and minimize component complexity. Treating RO as a dynamical system, this dissertation invents new processes for high-efficiency desalination that achieve milestones for low downtime and high final salinity. It also introduces modeling methods that include more detail (e.g. salt retention, time-varying salinity, concentration polarization, salt transport, temporal multi-staging, etc.) and the first use of certain optimization methods in RO.</p><p dir="ltr">Batch RO is an unsteady, pressure driven process that efficiently desalinates a saline feed volume over time by continuously recirculating the brine through the membrane module. A tank houses the concentrating feed and mediates the streams entering and leaving the membrane module. Most studies so far have concentrated on the high-pressure tank design that requires finite downtime at the end of each stroke. A scalable pressure exchanger batch RO (PX-BRO) configuration using atmospheric tanks that practically has zero downtime and produces permeate even while flushing is first described in this dissertation.</p><p dir="ltr">To achieve high recovery at nominal RO pressures, osmotically assisted RO processes have both sides of the membrane saline and the streams usually in counterflow. The first unsteady osmotically assisted process based on the high-pressure piston tank design, batch counterflow RO (BCFRO) is introduced which dramatically reduces the energy needs. To address the issue of high component count in spatial multi-staging, the first “temporally multi-staged” BCFRO process is also introduced. The new process uses the pressure ex- changer and atmospheric pressure tank design for scalability and operational flexibility.</p><p dir="ltr">For membranes with low salt rejection, it becomes imperative to integrate the salt trans- port dynamics for deciding operating and initial conditions. Trajectory optimization is used to match salinity and volume between stages of temporally multi-staged BCFRO. Treating the process as an optimal control problem, a framework for obtaining time varying flux pro- files that minimize the specific energy consumption is also developed. Both reduced order and discretized models are developed to analyze these new batch RO configurations.</p> Batch reverse osmosis Dynamics Trajectory optimization Variable flux operation Temporal multi-staging Zero downtime Osmotically assisted Counterflow
4	Guidelines for successful implementation of total productive maintenance in a chemical plant / Jethro Padya Mahlangu Mahlangu, Jethro Padya January 2014 (has links) With the world economy becoming unpredictable, it has become a necessity for businesses to relook at the way they do business. The world has become competitive and companies that aim to become profitable have seen the need to find ways to improve efficiencies and increase productivity to stay relevant. There has been an adoption of strategies that are aimed at improving the efficiencies in companies such as Total Productive Maintenance (TPM). The strategy is aimed at improving equipment efficiencies and increase productivity through the transfer of certain skills from maintenance personnel to operators. The aim is that the operators perform some of the activities that the maintenance people used to do and they do the more complex tasks. By transferring these skills to operators there is constant cleaning, inspections and lubricating of equipment. This frees up time for maintenance people to do planning and other jobs that require time and higher skills levels. The implementation of these activities allows companies to tap into unused capacity that was always hidden by breakdowns and unplanned stops. The process however requires commitment from management and all stakeholders involved in the organisation. There are prescribed implementation processes that can be followed or companies can follow their own processes but the fundamentals of involving people from the onset must be followed. The involvement of stakeholders creates commitment at all levels and in order to sustain this initiative people must be committed to it. The inclusion of the activities transferred from maintenance people to operators, will reinforce the knowledge and habits required from operators and perhaps sustain the initiative. / MBA, North-West University, Potchefstroom Campus, 2015 Total Productive maintenance Overall equipment efficiency TPM Deployment Autonomous maintenance Plant maintenance Preventative maintenance Planned maintenance Quality maintenance Focused improvement Early equipment management Training and education Safety Health and Environment TPM in administration Zero defects Zero waste Zero downtime 5S Breakdown maintenance Preventative maintenance Corrective maintenance Maintenance prevention Downtime losses Speed losses Defect losses Quality defect losses Normal production loss Abnormal production losses Maintenance schedules Prescribed TPM deployment Equipment failure Function failure Function reduction Reprocessing losses Factors of successful TPM deployment
5	Guidelines for successful implementation of total productive maintenance in a chemical plant / Jethro Padya Mahlangu Mahlangu, Jethro Padya January 2014 (has links) With the world economy becoming unpredictable, it has become a necessity for businesses to relook at the way they do business. The world has become competitive and companies that aim to become profitable have seen the need to find ways to improve efficiencies and increase productivity to stay relevant. There has been an adoption of strategies that are aimed at improving the efficiencies in companies such as Total Productive Maintenance (TPM). The strategy is aimed at improving equipment efficiencies and increase productivity through the transfer of certain skills from maintenance personnel to operators. The aim is that the operators perform some of the activities that the maintenance people used to do and they do the more complex tasks. By transferring these skills to operators there is constant cleaning, inspections and lubricating of equipment. This frees up time for maintenance people to do planning and other jobs that require time and higher skills levels. The implementation of these activities allows companies to tap into unused capacity that was always hidden by breakdowns and unplanned stops. The process however requires commitment from management and all stakeholders involved in the organisation. There are prescribed implementation processes that can be followed or companies can follow their own processes but the fundamentals of involving people from the onset must be followed. The involvement of stakeholders creates commitment at all levels and in order to sustain this initiative people must be committed to it. The inclusion of the activities transferred from maintenance people to operators, will reinforce the knowledge and habits required from operators and perhaps sustain the initiative. / MBA, North-West University, Potchefstroom Campus, 2015 Total Productive maintenance Overall equipment efficiency TPM Deployment Autonomous maintenance Plant maintenance Preventative maintenance Planned maintenance Quality maintenance Focused improvement Early equipment management Training and education Safety Health and Environment TPM in administration Zero defects Zero waste Zero downtime 5S Breakdown maintenance Preventative maintenance Corrective maintenance Maintenance prevention Downtime losses Speed losses Defect losses Quality defect losses Normal production loss Abnormal production losses Maintenance schedules Prescribed TPM deployment Equipment failure Function failure Function reduction Reprocessing losses Factors of successful TPM deployment

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