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## Multi-Cell Random Beamforming: Achievable Rate and Degrees of Freedom Region

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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Random beamforming (RBF) is a practically favourable transmission scheme for
multiuser multi-antenna downlink systems since it requires only partial channel
state information (CSI) at the transmitter. Under the conventional single-cell
setup, RBF is known to achieve the optimal sum-capacity scaling law as the
number of users goes to infinity, thanks to the multiuser diversity enabled
transmission scheduling that virtually eliminates the intra-cell interference.
In this paper, we extend the study of RBF to a more practical multi-cell
downlink system with single-antenna receivers subject to the additional
inter-cell interference (ICI). First, we consider the case of finite
signal-to-noise ratio (SNR) at each receiver. We derive a closed-form
expression of the achievable sum-rate with the multi-cell RBF, based upon which
we show an asymptotic sum-rate scaling law as the number of users goes to
infinity. Next, we consider the high-SNR regime and for tractable analysis
assume that the number of users in each cell scales in a certain order with the
per-cell SNR. Under this setup, we characterize the achievable degrees of
freedom (DoF) for the single-cell case with RBF. Then we extend the analysis to
the multi-cell RBF case by characterizing the DoF region. It is shown that the
DoF region characterization provides useful guideline on how to design a
cooperative multi-cell RBF system to achieve optimal throughput tradeoffs among
different cells. Furthermore...

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## Intelligent Product: Mobile Agent Architecture Integrating the End of Life Cycle (EOL) For minimizing the lunch phase PLM

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 21/01/2014
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To improve the increasingly demands products that are customized, all
business activities performed along the product life cycle must be coordinated
and efficiently managed along the extended enterprise. For this, enterprise had
wanted to retain control over the whole product lifecycle especially when the
product is in use/recycling (End Of Life phase). Although there have been many
previous research works about product lifecycle management in the beginning of
life (BOL) and middle of life (MOL) phases, few addressed the end of life (EOL)
phase, in particular, when the product is at the customers. In this paper,
based on product embedded device identification (PEID) and mobile agent
technologies, and with the advent of the development of the "intelligent
products", we will try to improve innovation: (a) by minimize the lunch phase,
(b) and the involvement of the customer in product lifecycle.; Comment: 8 pages, 11 figures, The Proceeding of International Conference on
Soft Computing and Software Engineering 2013

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## Limitations of PLL simulation: hidden oscillations in MatLab and SPICE

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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#Computer Science - Other Computer Science#Mathematics - Dynamical Systems#Nonlinear Sciences - Chaotic Dynamics

Nonlinear analysis of the phase-locked loop (PLL) based circuits is a
challenging task, thus in modern engineering literature simplified mathematical
models and simulation are widely used for their study. In this work the
limitations of numerical approach is discussed and it is shown that, e.g.
hidden oscillations may not be found by simulation. Corresponding examples in
SPICE and MatLab, which may lead to wrong conclusions concerning the
operability of PLL-based circuits, are presented.

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## Study on FLOWSIM and its Application for Isolated Signal-ized Intersection Assessment

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 30/07/2014
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Recently the traffic related problems have become strategically important,
due to the continuously increasing vehicle number. As a result, microscopic
simulation software has become an efficient method in traffic engineering for
its cost-effectiveness and safety characteristics. In this paper, a new fuzzy
logic based simulation software (FLOWSIM) is introduced, which can reflect the
mixed traffic flow phenomenon in China better. The fuzzy logic based
car-following model and lane-changing model are explained in detail.
Furthermore, its applications for mixed traffic flow management in mid-size
cities and for signalized intersection management assessment in large cities
are illustrated by examples in China. Finally, further study objectives are
discussed.

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## Some properties of the regular asynchronous systems

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 12/04/2008
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The asynchronous systems are the models of the asynchronous circuits from the
digital electrical engineering. An asynchronous system f is a multi-valued
function that assigns to each admissible input u a set f(u) of possible states
x in f(u). A special case of asynchronous system consists in the existence of a
Boolean function \Upsilon such that for any u and any x in f(u), a certain
equation involving \Upsilon is fulfilled. Then \Upsilon is called the generator
function of f (Moisil used the terminology of network function) and we say that
f is generated by \Upsilon. The systems that have a generator function are
called regular.
Our purpose is to continue the study of the generation of the asynchronous
systems that was started in [2], [3].; Comment: International Conference on Computers, Communications & Control 2008,
May 15-17, Baile Felix, Romania

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## Engineering Multilevel Graph Partitioning Algorithms

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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#Computer Science - Data Structures and Algorithms#Computer Science - Distributed, Parallel, and Cluster Computing

We present a multi-level graph partitioning algorithm using novel local
improvement algorithms and global search strategies transferred from the
multi-grid community. Local improvement algorithms are based max-flow min-cut
computations and more localized FM searches. By combining these techniques, we
obtain an algorithm that is fast on the one hand and on the other hand is able
to improve the best known partitioning results for many inputs. For example, in
Walshaw's well known benchmark tables we achieve 317 improvements for the
tables 1%, 3% and 5% imbalance. Moreover, in 118 additional cases we have been
able to reproduce the best cut in this benchmark.; Comment: fixed a problem with the medium sized instances

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## Biodegradable Polylactic Acid (PLA) Microstructures for Scaffold Applications

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 21/02/2008
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In this research, we present a simple and cost effective soft lithographic
process to fabricate PLA scaffolds for tissue engineering. In which, the
negative photoresist JSR THB-120N was spun on a glass subtract followed by
conventional UV lithographic processes to fabricate the master to cast the PDMS
elastomeric mold. A thin poly(vinyl alcohol) (PVA) layer was used as a mode
release such that the PLA scaffold can be easily peeled off. The PLA precursor
solution was then cast onto the PDMS mold to form the PLA microstructures.
After evaporating the solvent, the PLA microstructures can be easily peeled off
from the PDMS mold. Experimental results show that the desired microvessels
scaffold can be successfully transferred to the biodegradable polymer PLA.; Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/EDA-Publishing)

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## A Method to determine Partial Weight Enumerator for Linear Block Codes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 25/12/2012
Português

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In this paper we present a fast and efficient method to find partial weight
enumerator (PWE) for binary linear block codes by using the error impulse
technique and Monte Carlo method. This PWE can be used to compute an upper
bound of the error probability for the soft decision maximum likelihood decoder
(MLD). As application of this method we give partial weight enumerators and
analytical performances of the BCH(130,66), BCH(103,47) and BCH(111,55)
shortened codes; the first code is obtained by shortening the binary primitive
BCH (255,191,17) code and the two other codes are obtained by shortening the
binary primitive BCH(127,71,19) code. The weight distributions of these three
codes are unknown at our knowledge.; Comment: Computer Engineering and Intelligent Systems Vol 3, No.11, 2012

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## Publicity of the intimate text (the blog studying and publication)

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 30/05/2011
Português

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One of the important problems of a modern society - communications. At all
readiness of this question both humanitarian, and engineering science, process
of transfer and information reception remains in the centre of attention of
researchers. The dialogue phenomenon in a network becomes the significant
factor of such attention. The fact of the publication of blogs and increasing
popularity of bloggers is connected, in our opinion, with an increasing
openness of a blog sphere (each record can be commented any user), and
accordingly, the Internet as a whole.; Comment: 6 pages

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## Design and Implementation of a Computational Lexicon for Turkish

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 19/02/1997
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All natural language processing systems (such as parsers, generators,
taggers) need to have access to a lexicon about the words in the language. This
thesis presents a lexicon architecture for natural language processing in
Turkish. Given a query form consisting of a surface form and other features
acting as restrictions, the lexicon produces feature structures containing
morphosyntactic, syntactic, and semantic information for all possible
interpretations of the surface form satisfying those restrictions. The lexicon
is based on contemporary approaches like feature-based representation,
inheritance, and unification. It makes use of two information sources: a
morphological processor and a lexical database containing all the open and
closed-class words of Turkish. The system has been implemented in SICStus
Prolog as a standalone module for use in natural language processing
applications.; Comment: M.Sc. Thesis submitted to the Department of Computer Engineering and
Information Science, Bilkent University, Ankara, Turkey. 138 pages (including
title pages). LaTeX. 8 figures. Uses avm.sty, lingmacros.sty, buthesis.sty,
QobiTree.tex, psfig.tex. Also available as
ftp://ftp.cs.bilkent.edu.tr/pub/tech-reports/1997/BU-CEIS-9701.ps.z

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## Design of a Low Voltage Class-AB CMOS Super Buffer Amplifier with Sub Threshold and Leakage Control

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 24/04/2014
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This paper describes a CMOS analogy voltage supper buffer designed to have
extremely low static current Consumption as well as high current drive
capability. A new technique is used to reduce the leakage power of class-AB
CMOS buffer circuits without affecting dynamic power dissipation. The name of
applied technique is TRANSISTOR GATING TECHNIQUE, which gives the high speed
buffer with the reduced low power dissipation (1.105%), low leakage and reduced
area (3.08%) also. The proposed buffer is simulated at 45nm CMOS technology and
the circuit is operated at 3.3V supply[11]. Consumption is comparable to the
switching component. Reports indicate that 40% or even higher percentage of the
total power consumption is due to the leakage of transistors. This percentage
will increase with technology scaling unless effective techniques are
introduced to bring leakage under control. This article focuses on circuit
optimization and Design automation techniques to accomplish this goal [9].; Comment: 5 pages, 6 figures, International Journal of Engineering Trends and
Technology (IJETT)-Volume 7 Number 1 - Jan 2014

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## Fabrication of Nanostructured PLGA Scaffolds Using Anodic Aluminum Oxide Templates

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 07/05/2008
Português

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PLGA (poly(lactic-co-glycolic acid)) is one of the most used biodegradable
and biocompatible materials. Nanostructured PLGA even has great application
potentials in tissue engineering. In this research, a fabrication technique for
nanostructured PLGA membrane was investigated and developed. In this novel
fabrication approach, an anodic aluminum oxide (AAO) film was use as the
template ; the PLGA solution was then cast on it ; the vacuum air-extraction
process was applied to transfer the nano porous pattern from the AAO membrane
to the PLGA membrane and form nanostures on it. The cell culture experiments of
the bovine endothelial cells demonstrated that the nanostructured PLGA membrane
can double the cell growing rate. Compared to the conventional chemical-etching
process, the physical fabrication method proposed in this research not only is
simpler but also does not alter the characteristics of the PLGA. The
nanostructure of the PLGA membrane can be well controlled by the AAO temperate.; Comment: Submitted on behalf of EDA Publishing Association
(http://irevues.inist.fr/handle/2042/16838)

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## Design, Analysis, and Simulation of a Pipe-Welding Robot with Fixed Plinth

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 06/01/2015
Português

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Industrial requirements concerning the increased efficiency and high rate of
manufacturing result in the development of manufacturer robots, and a vast
group of these types of robots is used for welding. This study presented the
design, analysis, and simulation of a pipe-welding robot with fixed plinth for
a constant circular welding around the pipes. Design of a welding robot capable
of keeping the electrode orientation, welding speed, and distance between
electrode and pipe surface constant can improve the quality of welding; thus, a
five-linked articulated robot was designed for this purpose. Solving of direct
and diverse kinematics and dynamics equations of the robot was done by means of
Matlab software. The robot was also simulated using a program written in Matlab
and the diagrams of angles, velocities, and accelerations of all the arms, and
the applied force and torque of each arm required for drive the mechanism were
obtained.; Comment: 6 pages, 11 figures, 3rd International Conference on Manufacturing
Engineering, ICME2011, Tehran, Iran

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## Universal regular autonomous asynchronous systems: omega-limit sets, invariance and basins of attraction

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 28/12/2010
Português

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The asynchronous systems are the non-deterministic real time-binary models of
the asynchronous circuits from electrical engineering. Autonomy means that the
circuits and their models have no input. Regularity means analogies with the
dynamical systems, thus such systems may be considered to be the real time
dynamical systems with a 'vector field' {\Phi}:{0,1}^2 \rightarrow {0,1}^2.
Universality refers to the case when the state space of the system is the
greatest possible in the sense of the inclusion. The purpose of the paper is
that of defining, by analogy with the dynamical systems theory, the
{\omega}-limit sets, the invariance and the basins of attraction of the
universal regular autonomous asynchronous systems.; Comment: accepted to be published in Mathematics and its Applications/Annals
of the Academy of the Romanian Scientists

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## 3D simulation of complex shading affecting PV systems taking benefit from the power of graphics cards developed for the video game industry

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 03/10/2014
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Shading reduces the power output of a photovoltaic (PV) system. The design
engineering of PV systems requires modeling and evaluating shading losses. Some
PV systems are affected by complex shading scenes whose resulting PV energy
losses are very difficult to evaluate with current modeling tools. Several
specialized PV design and simulation software include the possibility to
evaluate shading losses. They generally possess a Graphical User Interface
(GUI) through which the user can draw a 3D shading scene, and then evaluate its
corresponding PV energy losses. The complexity of the objects that these tools
can handle is relatively limited. We have created a software solution, 3DPV,
which allows evaluating the energy losses induced by complex 3D scenes on PV
generators. The 3D objects can be imported from specialized 3D modeling
software or from a 3D object library. The shadows cast by this 3D scene on the
PV generator are then directly evaluated from the Graphics Processing Unit
(GPU). Thanks to the recent development of GPUs for the video game industry,
the shadows can be evaluated with a very high spatial resolution that reaches
well beyond the PV cell level, in very short calculation times. A PV simulation
model then translates the geometrical shading into PV energy output losses.
3DPV has been implemented using WebGL...

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## Propuesta de sistema GeoInform\'atico con representaci\'on de escenarios para auxiliar en la nueva metodolog\'ia propuesta por INETER y la UNI para el estudio a gran escala de la vulnerabilidad y da\~nos debido a sismos en las edificaciones

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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A GIS based software is presented which permits the estimation of seismic
vulnerability and the presentation of results in digital maps for single
houses, groups of buildings, parts of settlements or even complete towns.
Nicaragua is a country with a high seismic activity. The assessment of seismic
vulnerability requires the execution of distinct tasks, e.g. recollection of
field data, integration of data from the municipal cadastre, reprocessing or
screening to test the reliability of the data, definition of calculation of
vulnerability functions, calculation of vulnerability for single objects as
houses or buildings, calculation of mean vulnerability for certain areas as
barrios or squares. In order to reduce time and effort to be spent with several
unspecialized tools and procedures, an integrated software system was created,
the user of which has not to care about separate software tools for each part
of the process. The main advantage of the software is the combination of
Geographical Information System (GIS) with the logics that surrounds the
specific methodologies of seismic vulnerability index, index of damages and
presentation of results. The new software uses a connection with an external
centralized Enterprise Data Base which stores all the input information and
calculation results and which is automatically synchronized for the
presentation of results using GIS. The cadastral information contains data on
the constructive type of the house...

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## Generation of Test Vectors for Sequential Cell Verification

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 26/10/2011
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For Application Specific Integrated Circuits (ASIC) and System-on-Chip (SOC)
designs, Cell - Based Design (CBD) is the most prevalent practice as it
guarantees a shorter design cycle, minimizes errors and is easier to maintain.
In modern ASIC design, standard cell methodology is practiced with sizable
libraries of cells, each containing multiple implementations of the same logic
functionality, in order to give the designer differing options based on area,
speed or power consumption. For such library cells, thorough verification of
functionality and timing is crucial for the overall success of the chip, as
even a small error can prove fatal due to the repeated use of the cell in the
design. Both formal and simulation based methods are being used in the industry
for cell verification. We propose a method using the latter approach that
generates an optimized set of test vectors for verification of sequential
cells, which are guaranteed to give complete Single Input Change transition
coverage with minimal redundancy. Knowledge of the cell functionality by means
of the State Table is the only prerequisite of this procedure.; Comment: Presented in ARM Regional Engineering Conference, 2008

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## Etude des d\'eterminants psychologiques de la persistance dans l'usage d'un jeu s\'erieux : \'evaluation de l'environnement optimal d'apprentissage avec Mecagenius?

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 06/02/2015
Português

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The aim of this paper is to show the relevance of motivational key concepts
in evaluating the use of serious game. This research involves 115 students
training with Mecagenius (serious game in mechanical engineering). The results
of the exploratory study also confirm the relevance of the use of flow in
Education scale (EduFlow) to evaluate the optimal learning experienc ewith a
serious game. It also appears that EduFlow is related to specific actions
within the school context such as self-efficacy, motivational climate and
interest.; Comment: in French

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## Analysing viewpoints in design through the argumentation process

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 04/12/2006
Português

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We present an empirical study aimed at analysing the use of viewpoints in an
industrial Concurrent Engineering context. Our focus is on the viewpoints
expressed in the argumentative process taking place in evaluation meetings. Our
results show that arguments enabling a viewpoint or proposal to be defended are
often characterized by the use of constraints. Firstly, we show that, even if
some constraints are apparently identically used by the different specialists
involved in meetings, various meanings and weightings are associated with these
constraints by these different specialists. Secondly, we show that the implicit
or explicit nature of constraints depends on several interlocutive factors.
Thirdly, we show that an argument often covers not only one constraint but a
network of constraints. The type of combination reflects viewpoints which have
specific status in the meeting. Then, we will propose a first model of the
dynamics of viewpoints confrontation/integration.

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## Minimum Component Based First-Order Inverting and Non-inverting Outputs of All-Pass Filter at the Same Circuit

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 09/10/2012
Português

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In this paper, a new voltage-mode first order all-pass filter using minimum
active and passive components is presented. The proposed circuit employs one
fully differential second generation current conveyor (FDCCII), one grounded
capacitor, one resistor and offers the following advantages: the use of only
grounded capacitor which is attractive for integrated circuit implementation,
low active and passive sensitivities, providing inverting and non-inverting
voltage-mode all-pass responses simultaneously from the single circuit and no
requirement for component matching conditions. The theory is validated through
PSPICE simulation using TSMC 0.35micrometer CMOS process parameters.; Comment: ACEEE International Journal on Electrical and Power Engineering, 2010

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