1,085 research outputs found
Minimaliseren van het aantal kruisingen in een multi-level graaf
No full textIn deze scriptie bestuderen we het aantal kruisingen in een graaf waarbij de knopen in verschillende horizontale levels verdeeld zijn, ook wel het MLCM (Multi-Level Crossing Minimization) probleem genoemd. Vaak wordt een gerichte graaf afgebeeld als een multi-level graaf. We bekijken een voorbeeld van een gerichte graaf: de stamboom van TU Delft medewerkers bij de afdeling Toegepaste Wiskunde, die ontwikkeld is door Kees Roos. In deze stamboom zitten veel kruisingen waardoor de graaf niet heel goed leesbaar is. Door het aantal kruisingen te minimaliseren zal dit verbeterd worden. Dit doen we door de knopen in nieuwe horizontale levels te verdelen en de knopen in de levels in een andere volgorde te zetten. Om een ordening van de knopen in de levels te vinden waardoor het aantal kruisingen minimaal is, zullen we het probleem omschrijven als een semi-definiet programma (SDP). Maar voordat we zover zijn stellen we eerst een integer lineair programma (ILP) op waarop onze SDP is gebaseerd. Voor het SDP moeten we een kostenmatrix defini ëren die het aantal kruisingen tussen twee levels weergeeft. Daarnaast moeten we voorwaarden opstellen zodat de ordening in de levels ook toegelaten is. Omdat het SDP erg moeilijk op te lossen is, gaan we kijken naar een relaxatie. Deze relaxatie is nog erg zwak en zullen we versterken met meer voorwaarden. Uiteindelijk krijgen we een relaxatie die sterker is dan de lineaire relaxatie van het ILP. Na het vinden van de sterke SDP-relaxatie willen we het probleem natuurlijk oplossen. We gebruiken hierbij twee verschillende oplossingsmethoden om alle voorwaarden mee te kunnen nemen. Ten slotte wordt dit allemaal gebruikt om de stamboom beter leesbaar te maken.Electrical Engineering, Mathematics and Computer ScienceDelft Institute of Applied Mathematics (DIAM
Werksessie B: Specifieker, Karin de Graaf
No full textStuur specifieker op kwaliteit van onderhoud. Verzamel niet meer informatie, maar de juiste informatie op het juiste moment. Leg dit zo vast dat zowel technische medewerkers als bestuurders grip krijgen op onderhoudskwaliteit
Limietstellingen voor het aantal lussen in een random graaf
No full textBeschouw een random graaf in het configuratiemodel. We analyseren de verdeling van het aantal lussen in een specifieke knoop wanneer het totaal aantal verbindingen, n, naar oneindig gaat. We onderscheiden daartoe drie situaties: de knoop heeft een eindig aantal, van de orde wortel n en van de orde n verbindingen.Applied mathematicsElectrical Engineering, Mathematics and Computer Scienc
Wat moet eruit komen? Reactie op de kritische bijdrage van Kalmijn en De Graaf
No full textThe article focuses on the views of the author regarding the evaluation of his test book by Mathijs Kalmijn and Paul M. De Graaf meant for measuring professional status. Both Kalmijn and Graff have compared the scales proposed by the author and other scales for measuring professional status. They have claimed that GK-schaal is more effective than that of the author. According to the author, they have based their theoretical foundation of objective scales on training and profession
Gepolariseerde Neutronen Reflectometrie aan Dunne Magnetische Lagen
No full textMechanical Maritime and Materials Engineerin
2019-2020 Anne Newman Sutton Weeks Poetry Series - Kara van de Graaf and Mahtem Shiferraw
No full textKara van de Graaf is the author of "Spitting Image," winner of the Crab Orchard First Book Prize in Poetry. She is co-founder and editor of Lightbox Poetry, an online educational resource for poetry in the classroom (lightboxpoetry.com) and serves as assistant professor of creative writing at Utah Valley University. Mahtem Shiferraw is a writer and visual artist from Ethiopia and Eritrea. Her work has been published in her chapbook, "Behind Walls & Glass," and two full length books: "Fuchsia," which won the Sillerman Prize for African Poets from the University of Nebraska Press and "Your Body Is War," new this year. She is the executive director of college initiatives at Otis College in Los Angeles. The speakers were introduced by Natasha Sajé, Professor of English and curator of the Anne Newman Sutton Weeks Poetry Series. This lecture was held and filmed on November 7, 2019 at the Kim T. Adamson Alumni House, Westminster College, Salt Lake City, Utah
Design Requirements for Future Technology to Enhance Surgical Instrument Counting: An Observational Study at the Reinier de Graaf Gasthuis
No full textINTRODUCTION Surgical counting of instruments forms a crucial part of safety procedures in the operating room (OR). This process has remained primitive without technological support. The manual count process is time-consuming and places heavy cognitive demands on nurses. Current technological approaches fail to detect the exact and detailed usage of surgical instruments under real-life OR conditions. This research aims to enhance surgical instrument counting in the hospital by identifying challenges in the pre-operative, intra-operative, and postoperative phases and formulating design requirements for future technology. METHODS An observational study was conducted in a large teaching hospital in Delft. The process of surgical instrument counting was assessed in the pre-operative, intra-operative, and postoperative phases of 50 surgeries. Nurses were surveyed to assess the method used, the experienced workload, and the willingness to adopt technology for surgical counting. The sterilization department provided data on the number of additional surgical instruments found on surgical trays after surgery and data on the different types of surgical trays delivered to the hospital. RESULTS In all surgeries, surgical instrument counting was not performed according to the hospital’s protocol due to limited time and resources. Nurses used a technique to memorize the surgical instrument count by placing the surgical instruments in even numbers on the surgical instrument table. Surgical instruments were retrieved from their original surgical tray and placed on a surgical instrument table in case of frequent use or retrieved from their surgical tray and promptly handed to the surgeon in case of infrequent use. The return of surgical instruments to the surgical trays occurred intermittently, mostly when the surgical instrument was not deemed necessary anymore for the remaining surgery. After sterilization, occasionally incomplete surgical trays arrived at the hospital (10,0%), necessitating additional surgical trays to be added to the sterile field. During a 16-week timeframe, 801 additional surgical instruments were found on surgical trays indicating they were not returned to their original surgical tray. All nurses were willing to adopt technology for surgical counting, specifically in the pre-and postoperative phases. CONCLUSION This study highlighted the challenge of balancing protocol, ensuring patient safety, and working efficiently. A control measure for the initial and final surgical instrument count is necessary for every surgery, as the current technique is insufficient. The design requirements for future technology are monitoring counts in the preparation room (PR) and OR, adjusting to accommodate additional surgical trays, having a focal area on the surgical tray, and identifying incomplete surgical trays. Future technology could enhance surgical instrument counting at the Reinier de Graaf Gasthuis by ensuring the presence and return of used surgical instruments to their original surgical tray.Biomedical Engineerin
De bereiding van anthrachinon
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
An international growth strategy for a fast-growing last mile delivery planning company
No full textPlotwise is a tech scale-up that offers continuous planning for last mile delivery. By providing data-driven AI planning software as a service, the company strives to improve the delivery planning process of its customers and thereby allowing them to handle the growth in demand for home delivery. The home delivery market is expanding at an exponential rate. The COVID-19 pandemic has pushed the e-commerce market five years ahead, more packages are delivered every day and this volume is rapidly growing. Online shoppers are reshaping the delivery economy from supply- to demand-driven. They expect their deliveries to be free, fast and convenient. At the same time, logistics operators and (online) retailers strive to find the optimal balance between costs, operational efficiency and customer experience. Improving environmental performance is getting increasingly important as well. This puts significant stress on their planning and delivery process. Plotwise seems successful in terms of its product-market fit. Hence, the management team wants to rapidly scale the company through signing new customers in at least four additional European countries between now and 2022. For this reason, the Head of Sales of Plotwise asked the author of this thesis to design a sales strategy that guides the company in entering European countries with its current product. The author created this sales strategy through performing a literature review, an internal analysis, an external analysis and quantitative market research. Strategic design principles complemented these research methodologies. This thesis presents the results of this research. In the literature review, the author discusses theoretic elements of traditional market entry strategy literature. The review synthesises the findings into a model that guided the development of the sales strategy. An internal analysis on Plotwise’s vision, mission, product, business model and culture shows that the company is fit for international expansion. However, the analysis shows that the sales team faces several challenges that possibly slow down this scaling. To tackle the identified challenges, the author presents three sales tools in combination with a roadmap for 2021 and 2022. The expectation is that these tools will improve the lead conversion, thereby increasing the number of signed customers. The author created a market analysis framework to conduct a quantitative market study. The result of this analysis is a list of most attractive countries to enter; the advice is to enter the UK market first, followed by Sweden, Norway and France. This advice deviates from an initial assumption on entry sequence as made by the management team of Plotwise. Additionally, the author advises to focus on logistic service providers (LSP), third party logistics (3PL) companies, electronics e-tailers, brands and (online) grocery stores as first customer segments. Lastly, the author advises Plotwise to position as “future-proof planning partner for delivery service optimisation”. This positioning resonates with online shopper behaviour and differs from the competition. Moreover, it leverages the core competencies of Plotwise.Strategic Product Desig
Multidisciplinaire zorg voor kwetsbare ouderen: Ontwerp en capaciteitsbepaling van een poliklinisch proces in het Reinier de Graaf Gasthuis
No full textThe Reinier de Graaf Hospital in Delft has concluded that care for frail elderly with impaired mobility is not always optimal. Due to multimorbidity, traditional monodisciplinary care is not the best possible care. The Reinier de Graaf Hospital set out to improve their care process to serve the frail elderly best. It was found that the target group has a high risk for functional decline, dependence and reduced quality of life. Thus the target group can benefit from short admission and throughput times. In order to deliver the best possible care, multidisciplinary collaboration is found to be essential. Using soft and hard systems theory combined with thorough data analysis, the current process was evaluated. It was found that the average combined admission and throughput time was 196 days for the target group, in this period a patient visited the hospital 8,6 times. The hospital visits were found to be predominantly for outpatient care. The multidisciplinary care was largely delivered in a sequential manner. This leads to a lack of collaboration between medical specialist, to unnecessary long throughput times and to many hospital visits. To improve the quality of the health care logistics, improvements have been proposed in a process redesign. Instead of delivering care in a sequential manner, the redesign allows for parallel multidisciplinary treatment. In order to do so, a triage appointment is suggested at the start of the care route and appointments with multiple medical specialists should be clustered on a single day. Short admission and throughput times can be achieved by reserving capacity based on expected patient flow. By means of data analysis the expected future input volume is set at 14 patients per week and the mean capacity required was calculated accordingly. To assess the performance of the proposed design under stochastic influence, a discrete event simulation was developed and verified. The simulation results indicate that if 110% of the theoretical capacity is used, for the average patient the throughput time can be reduced by 50% to 73%, depending on the average wait time between visits. On average a simulated patient visited the hospital 4,4 times for 6,7 appointments. The cost for these improvements are an average occupancy drop for medical doctors of 15%.Production Engineering and LogisticsMarine and Transport TechnologyMechanical, Maritime and Materials Engineerin
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