447,476 research outputs found
Personal Blog Based on Spring Boot
Web application development has played an important role in software Engineering. Model-View-Controller (MVC) pattern lays a foundation for developing web applications. The MVC architecture separates an application into different business logic (data presentation, data management and request handling). The Spring Framework is an application framework used by Java application and there are extensions for building web applications [1]. Spring Boot is a framework tool designed to simplify the initialization of Spring, which makes it easy to create stand-alone, production-grade Spring based applications [2]. Hibernate is an Object-Relational Mapping tool which maps the database tables to the Object classes. The goal of this project is to develop a personal blog that can be used to write and post articles, pictures and codes by the administrator. The blog also allows general users to read and comment on the blogs. The architecture of the proposed system will be based on Spring Boot and Hibernate
Optical IFU Observations of the Brightest Cluster Galaxy NGC 4696: The Case for a Minor Merger and Shock-excited Filaments
We present deep optical integral-field spectroscopic observations of the
nearby (z ~ 0.01) brightest cluster galaxy NGC 4696 in the core of the
Centaurus Cluster, made with the Wide Field Spectrograph (WiFeS) on the ANU
2.3m telescope at Siding Spring Observatory. We investigate the morphology,
kinematics, and excitation of the emission-line filaments and discuss these in
the context of a model of a minor merger. We suggest that the emission-line
filaments in this object have their origin in the accretion of a gas-rich
galaxy and that they are excited by v ~100-200 km/s shocks driven into the cool
filament gas by the ram pressure of the transonic passage of the merging system
through the hot halo gas of NGC 4696.Comment: 19 pages, 15 figures, accepted for publication in The Astrophysical
Journa
Performance Comparison of Hibernate and EclipseLink Technologies for Mapping an Object-Oriented Model to a Relational Database
Different tiers of modern applications are built using object-oriented programming for implementing business logic and the relational database model for data storage. To solve the impendence mismatch issue that arises between the object model and relational schema, various Object-Relational Mapping (ORM) tools have been designed. In this research, the performance of two open source ORM technologies, namely Hibernate and EclipseLink, is investigated. Hibernate is a well established middleware solution while EclipseLink, which stems from Oracle’s TopLink, is a new product on the persistence landscape. For the purpose of this research, a web-based application was developed and used as a test system. The performance test facilities were integrated into design of the application. The abstract layer introduced into application’s architecture with the Spring Data Access Object (DAO), made the system highly modular allowing easily switching between persistence technologies with no alterations in the rest of the application code
A generic topological framework for physical simulation
This paper presents the use of a topological model to simulate a soft body deformation based on a Mass-Spring
System. We provide a generic framework which can integrate any kind of geometrical meshes (hexahedral or tetrahedral
elements), using several numerical integration schemes (Euler semi-implicit or implicit). This framework
naturally allows topological changes in the simulated object during the animation. Our model is based on the 3D
Linear Cell Complex topological model (itself based on a 3D combinatorial map), adding the extra information
required for simulation purposes. Moreover, we present some adaptations performed on this data structure to fit
our simulation requirements, and to allow efficient cutting or piercing in a 3D object
Object recognition with pictorial structures
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.Includes bibliographical references (p. 51-53).This thesis presents a statistical framework for object recognition. The framework is motivated by the pictorial structure models introduced by Fischler and Elschlager nearly 30 years ago. The basic idea is to model an object by a collection of parts arranged in a deformable configuration. The appearance of each part is modeled separately, and the deformable configuration is represented by spring-like connections between pairs of parts. These models allow for qualitative descriptions of visual appearance, and are suitable for generic recognition problems. The problem of detecting an object in an image and the problem of learning an object model using training examples are naturally formulated under a statistical approach. We present efficient algorithms to solve these problems in our framework. We demonstrate our techniques by training models to represent faces and human bodies. The models are then used to locate the corresponding objects in novel images.by Pedro F. Felzenszwalb.S.M
Multi-Wavelength Observations of the Blazar 1ES 1011+496 in Spring 2008
The BL Lac object 1ES 1011+496 was discovered at Very High Energy gamma-rays
by MAGIC in spring 2007. Before that the source was little studied in different
wavelengths. Therefore a multi-wavelength (MWL) campaign was organized in
spring 2008. Along MAGIC, the MWL campaign included the Metsahovi radio
observatory, Bell and KVA optical telescopes and the Swift and AGILE
satellites. MAGIC observations span from March to May, 2008 for a total of 27.9
hours, of which 19.4 hours remained after quality cuts. The light curve showed
no significant variability. The differential VHE spectrum could be described
with a power-law function. Both results were similar to those obtained during
the discovery. Swift XRT observations revealed an X-ray flare, characterized by
a harder when brighter trend, as is typical for high synchrotron peak BL Lac
objects (HBL). Strong optical variability was found during the campaign, but no
conclusion on the connection between the optical and VHE gamma-ray bands could
be drawn. The contemporaneous SED shows a synchrotron dominated source, unlike
concluded in previous work based on nonsimultaneous data, and is well described
by a standard one zone synchrotron self Compton model. We also performed a
study on the source classification. While the optical and X-ray data taken
during our campaign show typical characteristics of an HBL, we suggest, based
on archival data, that 1ES 1011+496 is actually a borderline case between
intermediate and high synchrotron peak frequency BL Lac objects.Comment: 13 pages, accepted for publication in MNRA
EULERIAN-LAGRANGIAN APPROACH FOR INTERACTIONS BETWEEN FLUIDS AND MULTIPLE DEFORMABLE SWELLING OBJECTS USING MASS-SPRING MODEL
A computation method was proposed for the interactions between Newtonian fluids and deformable solid objects which swell by absorbing the surrounding flids. The direct-forcing immersed boundary method and mass-spring model are used to estimate the fluid-solid interactive forces and deformations of the solid. The swelling of the object is simulated by changing the natural lengths of the spring models. In addition, the solid-solid interaction is treated by utilizing the distinct element method. The proposed method was applied to three numerical experiments. As a result, it was shown that the basic behaviors of the swelling-deformable objects are reasonably calculated with the present method
- …