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21 
Unsteady simulations of turbulent premixed reacting flowsSmith, Thomas M. 05 1900 (has links)
No description available.

22 
Linkflow, a linked saturatedunsaturated water flow computer model for drainage and subirrigationHavard, Peter January 1993 (has links)
No description available.

23 
Initial spatial motion of a rigid body on removal of one constraintBatra, Ajoy 19 October 1993 (has links)
This thesis presents a discussion of motion of a sixlegged walking
machine following removal of one leg constraint. To take a step, one leg
must be lifted and placed at some other position. As soon as the constraint
provided by the leg is removed, however the machine begins to fall. This
falling motion can be represented as screw motion of the body center of
mass and of bodyleg attachments.
First a study of body workspace of the machine was done with all six
feet on the ground. Body workspace is the intersection of kinematic and
force workspaces. Kinematic workspace is the volume in space where the
center of mass can be placed such that all joint angles of legs are within
specified limits; and force workspace is the volume in space where the force
in all legs is compressive. The affect of various foot positions, pitches and
heights of the center of mass were investigated to find a set of three
symmetric foot positions that might constitute acceptable intermediate
positions in a walking sequence.
Motion of the center of mass in the forward direction is limited in the
force workspace by two points at which the force on a pair of legs goes to
zero. With the center of mass at each of these two positions, the screw
parameters resulting from the release of force on one leg (front, middle and
hind individually) could be determined.
Dynamic simulation of these body and foot positions used the
commercial software SD/FAST. Code was written in C to do both static and
dynamic simulation of machine and merged with code generated by
SD/FAST. Code was also written in Auto Lisp to plot the falling motion of
machine.
Screw parameters found in this study were such that sustained
forward motion of the body could not be achieved using the falling motion
alone. Other measures such as extending one or more of the remaining five
legs would be needed for effective forward body motion. / Graduation date: 1994

24 
Mechanism design for auctions and pricingXiang, Xiangzhong, 項祥中 January 2014 (has links)
Recent years have seen extensive studies on the pricing problem, as well as its many variances. They have found important applications in computational economics. Nowadays typical applications can be found in internet advertising, Google’s Auction for TV ads and many other resource allocation problems in electronic markets. In electronic markets, thousands of trading activities are processed in the internet or done automatically by computer programs. It is highly required that the trading mechanisms are efficient enough. In the thesis, we will study various pricing problems from different perspectives.
The first problem we study is the design of auction mechanism when bidders are unitdemand. It can be applied in internet advertising. Thousand of advertisers bid for space in webpages to show their advertisements. We model the new problem and apply the General Second Price (GSP) mechanism to the problem. GSP is an efficient mechanism with linear time complexity. Moreover, we show that GSP has an envyfree equilibrium which can maximize the profit of advertisers.
Auction mechanisms where bidders can bid for multiple items are also studied. A famous example of such auction is the Dutch flower auction. Such multiunit auctions are widely studied these years. But budget constraints are not considered in many previous works. We study the scenario that each bidder has a budget on the money paid to the auctioneer and the valuation functions of bidders are nonlinear. For the model, we design an adaptive clinching auction mechanism. The mechanism is proved to be incentivecompatible, which encourages bidders to reveal their true values, and Paretooptimal, which ensures that no bidder can improve her utility without decreasing those of others.
In some auctions, the items on sale are not available at the same time. For example, TV stations sell timeslots for advertisements on a daily basis. The advertisers are arriving and departing online and bidding for a set of timeslots. For the auction, we design a competitive mechanism which is truthful, i.e., all bidders have the incentive to submit their true private values to the auctioneer. Another important property the mechanism achieves is promptness, which makes sure that any advertiser that wins some timeslots could learn her payment immediately after winning these timeslots.
In some pricing problems, upon the arrival of a new buyer, the seller needs to decide immediately whether he will sell his goods or not and what is the price. When buyers are unitdemand and each seller has b items on sale, the online pricing problem can be modelled by online weighted bmatching problem. For the problem, we show a randomized algorithm which achieves nearoptimal competitive ratio. When buyers are not unitdemand, things are much more complicated. We consider a general model in which each buyer wants to buy a bundle of items and has a nonincreasing valuation function for those items. We design a randomized algorithm which achieves low competitive ratio and derive a nontrivial lower bound on the competitive ratios. / published_or_final_version / Computer Science / Doctoral / Doctor of Philosophy

25 
Analysis of DNA shuffling by computer simulationHon, Winghong., 韓永康. January 2003 (has links)
published_or_final_version / abstract / toc / Computer Science and Information Systems / Master / Master of Philosophy

26 
Numerical simulation of fast reactions in turbulent liquidsNafia, Noureddine 12 1900 (has links)
No description available.

27 
Flexible multibody analysis of thin structures with actuated componentsChoi, JouYoung 12 1900 (has links)
No description available.

28 
LargeEddy simulation of combustion dynamics in swirling flowsStone, Christopher 05 1900 (has links)
No description available.

29 
Field testing of an agricultural land drainage computer modelPeyrow, Farzad January 1986 (has links)
No description available.

30 
Investigating students' learning of kinematics with webbased laboratory activities using computer simulationsAlkhalifah, Ahmed A. January 2003 (has links)
There is no abstract available for this dissertation. / Department of Physics and Astronomy

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