11,460 research outputs found
A Parsing Scheme for Finding the Design Pattern and Reducing the Development Cost of Reusable Object Oriented Software
Because of the importance of object oriented methodologies, the research in
developing new measure for object oriented system development is getting
increased focus. The most of the metrics need to find the interactions between
the objects and modules for developing necessary metric and an influential
software measure that is attracting the software developers, designers and
researchers. In this paper a new interactions are defined for object oriented
system. Using these interactions, a parser is developed to analyze the existing
architecture of the software. Within the design model, it is necessary for
design classes to collaborate with one another. However, collaboration should
be kept to an acceptable minimum i.e. better designing practice will introduce
low coupling. If a design model is highly coupled, the system is difficult to
implement, to test and to maintain overtime. In case of enhancing software, we
need to introduce or remove module and in that case coupling is the most
important factor to be considered because unnecessary coupling may make the
system unstable and may cause reduction in the system's performance. So
coupling is thought to be a desirable goal in software construction, leading to
better values for external software qualities such as maintainability,
reusability and so on. To test this hypothesis, a good measure of class
coupling is needed. In this paper, based on the developed tool called Design
Analyzer we propose a methodology to reuse an existing system with the
objective of enhancing an existing Object oriented system keeping the coupling
as low as possible.Comment: 15 page
Green Cellular Networks: A Survey, Some Research Issues and Challenges
Energy efficiency in cellular networks is a growing concern for cellular
operators to not only maintain profitability, but also to reduce the overall
environment effects. This emerging trend of achieving energy efficiency in
cellular networks is motivating the standardization authorities and network
operators to continuously explore future technologies in order to bring
improvements in the entire network infrastructure. In this article, we present
a brief survey of methods to improve the power efficiency of cellular networks,
explore some research issues and challenges and suggest some techniques to
enable an energy efficient or "green" cellular network. Since base stations
consume a maximum portion of the total energy used in a cellular system, we
will first provide a comprehensive survey on techniques to obtain energy
savings in base stations. Next, we discuss how heterogeneous network deployment
based on micro, pico and femto-cells can be used to achieve this goal. Since
cognitive radio and cooperative relaying are undisputed future technologies in
this regard, we propose a research vision to make these technologies more
energy efficient. Lastly, we explore some broader perspectives in realizing a
"green" cellular network technologyComment: 16 pages, 5 figures, 2 table
Towards the Formal Reliability Analysis of Oil and Gas Pipelines
It is customary to assess the reliability of underground oil and gas
pipelines in the presence of excessive loading and corrosion effects to ensure
a leak-free transport of hazardous materials. The main idea behind this
reliability analysis is to model the given pipeline system as a Reliability
Block Diagram (RBD) of segments such that the reliability of an individual
pipeline segment can be represented by a random variable. Traditionally,
computer simulation is used to perform this reliability analysis but it
provides approximate results and requires an enormous amount of CPU time for
attaining reasonable estimates. Due to its approximate nature, simulation is
not very suitable for analyzing safety-critical systems like oil and gas
pipelines, where even minor analysis flaws may result in catastrophic
consequences. As an accurate alternative, we propose to use a
higher-order-logic theorem prover (HOL) for the reliability analysis of
pipelines. As a first step towards this idea, this paper provides a
higher-order-logic formalization of reliability and the series RBD using the
HOL theorem prover. For illustration, we present the formal analysis of a
simple pipeline that can be modeled as a series RBD of segments with
exponentially distributed failure times.Comment: 15 page
Direct simulation for a homogenous gas
A probabilistic analysis of the direct simulation of a homogeneous gas is
given. A hierarchy of equations similar to the BBGKY hierarchy for the reduced
probability densities is derived. By invoking the molecular chaos assumption,
an equation similar to the Boltzmann equation for the single particle
probability density and the corresponding H-theorem is derived
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