La presente tesis desarrolla la investigación enfocada en el fenómeno conocido como start-ups, donde Perú ha sido escenario del rápido crecimiento de este tipo de innovaciones y cómo algunos de ellos ya están alcanzando mercados internacionales. Precisamente, el foco de esta investigación es conocer de manera más profunda aquellos factores que han logrado facilitar a estos emprendedores el ingreso a mercados extranjeros. Es en este punto que se busca conocer el nivel de importancia que representa para las start-ups cada uno de estos factores. La investigación se desarrolla considerando distintos puntos de vista. Por un lado, se encuentran los expertos del ecosistema emprendedor, representantes de instituciones públicas y privadas que están directamente relacionadas con las start-ups y el desarrollo de su ecosistema. Por otro lado, se tiene a los mismos emprendedores que son los usuarios de todas estas herramientas generadas en dicho ecosistema y cómo eso llevó a que algunos pudieran lograr la internacionalización. A partir de este enfoque, se logró identificar una serie de factores claves que necesitaban ser validados por la población de start-ups peruanas a través de una encuesta de opinión. Esto con el objetivo de identificar a los principales factores y tener un aporte que sirva de guía para aquellos que pertenecen al ecosistema. Conocer si existen relaciones o patrones entre los factores y las características de las start-ups, a través de metodologías cuantitativas. Finalmente, la tesis expone todos los resultados obtenidos, las conclusiones, recomendaciones e incluso las limitaciones bajo las que se desarrolló la investigación, contribuyendo de esta manera con el ecosistema emprendedor para que este documento sirva como guía para investigaciones más profundas acerca de este fenómeno que cada vez tiene mayor importancia en el Perú. / This thesis develops research focused on the phenomenon known as start-ups, where Peru has been the scenario of the rapid growth of this type of innovation and how some of them are already reaching international markets. Precisely, the focus of this research is to know more deeply those factors that have managed to facilitate these entrepreneurs entering foreign markets. It is at this point that we seek to know the level of importance that each of these factors represents for start-ups. The research was developed considering different points of view. On one hand, there are experts from the entrepreneurial ecosystem, representatives of public and private institutions that are directly related to start-ups and the development of their ecosystem. On the other hand, we have the entrepreneurs who are the users of all these tools generated in this ecosystem and how that led some of them to achieve internationalization. Based on this approach, it was possible to identify a series of key factors that needed to be validated by the Peruvian start-up population through an opinion poll. This with the objective of identifying the main factors and having a contribution that serves as a guide for those who belong to the ecosystem. To know if there are relations or patterns between the factors and the characteristics of the start-ups, through quantitative methodologies. Finally, the thesis exposes all the obtained results, conclusions, recommendations and even limitations under which the research was developed, contributing in this way with the entrepreneurial ecosystem so that this document serves as a guide for deeper investigations about this phenomenon that it is increasingly important in Peru. / Tesis

A modular and area-efficient 3D graphics accelerator for tile based rendering in FPGA systems has been designed and implemented. The accelerator supports a subset of OpenGL, with features such as mipmapping, multitexturing and blending. The accelerator consists of a software component for projection and clipping of triangles, as well as a hardware component for rasterization, coloring and video output. Trade-offs made between area, performance and functionality have been described and justified. In order to evaluate the functionality and performance of the accelerator, it has been tested with two different applications. / En modulär och utrymmeseffektiv 3D-grafikaccelerator för tile-baserad rendering i FPGA-system har designats och implementerats. Acceleratorn stöder en delmängd av OpenGL med funktioner som mipmapping, multitexturering och blending. Acceleratorn är uppdelad i en mjukvarudel för projektion och klippning av trianglar och en hårdvarudel för rastrering, färgsättning och utritning till skärm. Avvägningar som gjorts mellan area, prestanda och funktionalitet har beskrivits och motiverats. För att evaulera funktionalitet och prestanda har acceleratorn testats med två olika applikationer.

Precise machining of bearing rings is integral to finished bearing assembly quality. The output accuracy of center-based machining systems such as lathes or magnetic chuck grinders relates directly to the accuracy of part centering before machining. Traditional tooling and methods for centering on such machines are subject to wear, dimensional inaccuracy, setup time (hard tooling) and human error (manual centering).A flexible system for initial part centering is developed based on a single measurement system and actuator, whereby the part is placed by hand onto the machine table, rotated and measured to identify center of geometry offset from center of rotation, then moved by a series of controlled impacts or pushes to align the centers. The prototype centering system is developed as a demonstration platform for research in a number of mechanical engineering areas, particularly: Characterization of optimal state estimators through analysis of accuracy and computational efficiency; Distributed communication and control, efficient transfer of information in a real-time environment, and information sharing between processes; Modeling of sliding dynamics and the interaction of friction with compliant body dynamic models; Motion path planning through both deterministic geometric transforms and through frequency domain command manipulation.A vision is created for future work not only in the described areas, but also in the areas of advanced controller design incorporating multiple variables, derived machine diagnostic information, and application of the distributed communication architecture to information flow throughout the manufacturing organization. The guiding motivation for this research is reduction of manufacturing processing costs in the face of global competition. The technologies researched, developments made, and directions prescribed for future research aid in enabling this goal.

In external electron beam therapy arbitrarily shaped inserts (cutouts) are used to define the contours of the irradiated field. This thesis describes the implementation and verification of a software system to calculate output factors for cutouts using Monte Carlo simulations. The design goals were: (1) A stand-alone software system running on a single workstation. (2) Task oriented graphical user interface with shape input capability. (3) Implementation on Mac OS XRTM (10A.x Tiger). (4) CPU multicore support by job splitting. (5) EGSnrc (Patch level V4-r2-2-5) for particle transport and dose scoring. (6) Validation for clinical use. / The system, called Cutout Manager, can calculate output factors with 1% statistical error in 20 minutes on Mac Pro computer (Intel XeonRTM, 4 cores). When the BEAMnrc linac model correctly reproduces percentage depth doses in the buildup region and around R100, calculated and measured output factors are in good agreement with precision measurements of circular cutouts at 100 cm source-to-surface distance (SSD) and extended SSD. Cutout Manager simulations are consistent with measurements of clinical cutouts within a 2% error margin.

Experiment E683 at Fermi National Accelerator Laboratory (FNAL) in Batavia, Illinois, uses a modular, high-energy sampling calorimeter as the basis of the detector system. This detector provides information on the energy and position of particles that exit a collision of a photon or pion with a target proton. While exiting particles are thought to form what are described as "jets", and several E683 projects involve working with these jets, it has not yet been demonstrated that jets indeed have been detected.The solution proposed here involves demonstrating that E683 data has a statistically significant "jettiness" even in a data sample which has not been biased. Towards this, a data sample was selected based on criteria unrelated to the presumption of jets. Planarity and the Et Flow were chosen as measures of how oblong(jetlike) an event is. The sample was then examined for planarity and Et flow in a number of kinematic ranges and the results demonstrate that over a certain kinematic range, events in our sample are increasingly planar, as we hypothesized. / Department of Physics and Astronomy

The subject of this thesis is the improvement of particle tracking through the identification and correction of small systematic errors in particle "hit" locations due to positioning of tracking detectors. These errors call be as large or larger than the statistical spatial resolution of tracking detectors themselves, and therefore must be corrected. The focus is on identification and correction of errors due to rotations and beam axis translations.An algorithm is developed for use with proportional wire chamber and drift chamber detectors in experiment E683 at the Wideband facility of Fermi National Laboratory. In this experiment, high energy (tens of GeV) particles, primarily mesons, were produced when photons with energies of 40-400 GeV struck a metal or liquid target.At the present time, the method and code developed for this thesis has not been applied to real data, although an analysis of its effectiveness as a function of detector resolution has been investigated with Monte-Carlo simulations. / Department of Physics and Astronomy

iThemba LABS is a particle accelerator facility housing a radionuclide production facility that uses a 66 MeV proton beam to produce radionuclides for medical and industrial use. Ionising radiation is produced by a variety of sources at Themba LABS. Ionising is a health hazard. High doses can cause acute radiation syndrome, i.e. "radiation sickness". Lower doses cannot cause acute symptom, but carry a risk of radiation-related cancer. Ionising radiation is also detrimental to materials, and can damage polymers and lubricants e.g. Shielding is used to reduce radiation levels to values that should be safe for the intended level of human occupancy. Shield performance is vital to human health and the life expectancy of polymers and lubricants, so that quality management in shield design is very important. However, until 2003, there has been no formal system at iThemba LABS to evaluate and improve all radiation shield designs and layouts from a radiation protection perspective. This study deals with evaluating and redesigning radiation shielding in the radionuclide production facility of iThemba LABS. There are several designs and layouts in the radionuclide production building of iThemba LABS that lead to unnecessary exposure of personnel to ionising radiation. The shielding in these areas are sub-standard. Performance criteria for radiation shields are developed. Inadequate radiation shields are identified. The identified inadequate shields are: the processing hotcells, the target store room and the hotcells in the radiopharmaceutical dispensing laboratory, Point-Kernel radiation shielding calculations are done to specify materials and material thickness that will adequately protect workers against ionising radiation. / Thesis (MSc. ARST) North-West University, Mafikeng Campus, 2004

Thesis (Ph.D.) -- McMaster University, 1998. / Includes bibliographical references (leaves 214-220). Also available via World Wide Web.

Thesis (M.Sc.). / Written for the Medical Physics Department. Title from title page of PDF (viewed 2008/12/09). Includes bibliographical references.

Thesis (M.Sc.) - Carleton University, 2006. / Includes bibliographical references (p. 113-119). Also available in electronic format on the Internet.