Sökning: "operational cost"

Visar resultat 21 - 25 av 306 avhandlingar innehållade orden operational cost.

1. 21. Efficient commuter craft for urban waterborne public transportation

   Författare :Harsha Cheemakurthy; Karl Garme; Joakim Kalantari; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; waterborne public transportation; commuter ferry; modular design; operational requirements; ranking method; sustainable performance; ice operations; ice-hull Interaction; ice load; ice properties; kollektivtrafik på vatten; modulärt färjekoncept; modulär design; rankningsmetod; hållbarhetsparametrar; isbelastning; isförhållanden; isegenskaper; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : There has been a recent surge in interest in waterborne public transportation (WPT). Publictransport providers (PTP) are seeing its potential in complementing the existing transportnetwork and alleviating urban traffic congestion and pollution. But the adoption of WPTtoday is challenging due to a series of technical and implementation challenges. LÄS MER

3. 22. Quasi-analytical Modelling and Optimisation Techniques for Transport Aircraft Design

   Författare :Askin T. Isikveren; KTH; []
   Nyckelord :aircraft; conceptual; design; specifications; atmosphere; geometry; weight; aerodyanmics; propulsion; operational performance; stability and control; constrained multi-objective optimisation; computer aided design; regional; business; high-transonic; ;

   Sammanfattning : The research work presented here focuses on the subject oftransport aircraft design at the pre-design or conceptuallevel. The primary topics addressed are: (1) generation of avast array of new quasi-analytical expressions to permit aconceptual treatment of commercial and business transportaircraft with adequate sensitivity for more advanced tradestudies; (2) review and adoption of a method to predictstability and control characteristics (using the Mitchellmethod); (3) a study of the relative merits between variousmethods in facilitating an expedient and robust constrainedmulti-objective optimisation result within the context oftraditional conceptual design problems (Genetic Algorithms andNelder-Mead Simplex search); (4) creation of a software packageas a new and unique conceptual tool that permits the generationof design proposals in an accurate yet expeditious manner; and,(5) practical demonstration of the new conceptual designsoftware package by undertaking some actual aircraft designproposals. LÄS MER

4. 23. Assessing Energy Use and Carbon Emissions to Support Planning of Environmentally Sustainable Earthmoving Operations

   Författare :Hassanean S.H Jassim; Thomas Olofsson; Nashwan Dawood; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; energy use; CO2 emissions; earthmoving operation; operational characteristics; project conditions; selection equipment configuration; Byggproduktion och teknik; Construction Management and Building Technology;

   Sammanfattning : Road and infrastructure projects have significant environmental impacts due to their high energy consumption and CO2 emissions. Among it, earthmoving operations contribute disproportionately to these impacts because of their intensive use of heavy machinery. LÄS MER

5. 24. Optimal adaptive designs and adaptive randomization techniques for clinical trials

   Författare :Yevgen Ryeznik; Warwick Tucker; Andrew Hooker; Franz König; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; optimal designs; optimal adaptive designs; randomization in clinical trials; restricted randomization; adaptive randomization; unequal cost; allocation ratio preserving randomization procedures; heterogeneous costs; multi-arm clinical trials; randomization-based inference; unequal allocation; Tillämpad matematik och statistik; Applied Mathematics and Statistics;

   Sammanfattning : In this Ph.D. thesis, we investigate how to optimize the design of clinical trials by constructing optimal adaptive designs, and how to implement the design by adaptive randomization. LÄS MER

7. 25. Toward Industrialized Retrofitting : Accelerating the Transformation of the Residential Building Stock in Sweden

   Författare :Qian Wang; Ivo Martinac; Hasan Ala; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industrialized retrofitting; retrofitting toolkits; Swedish residential buildings; energy savings; cost-effectiveness; building typology; SRA - Energy; SRA - Energi;

   Sammanfattning : Energy utilization issues are becoming increasingly important around the world. Existing residential and building service sectors represent a large part of total energy utilization, and the corresponding operational costs and environmental impacts are high. LÄS MER