Miracle-dz/UniFAR-FTUs huggingface dataset:
Mobile propagation loss and delay spread characteristics with a low base station antenna on an urban road

Propagation loss and delay spread were studied experimentally, in order to design digital mobile communication systems. For propagation loss, the results were as follows, (i) When there are no obstacles on the road, the distance over which a radio wave propagates with only free-space loss increases with frequency. (ii) When there are obstacles (trucks and buses). and when the base station antenna heights are 5 and 15 m. the loss in excess of the free-space loss is 15 and 10 dB, respectively, at 1 km, (iii) Frequency dependence of this excess loss is not significant. (iv) On a cross road. the loss increases rapidly traveling away from the intersection. For the delay spread. the results were as follows. (i) The delay spread increases slightly with distance (less than 0.3 mu s within 1 km). (ii) The standard deviation of the delay spread increases slightly with distance (less than 0.2 mu s). Using the above results. a service area that extends along the road on which the base station is located and is limited in distance along cross roads can be predicted. >
Embedded Computer Vision System Applied to a Four-Legged Line Follower Robot

Robotics can be defined as the connection of perception to action. Taking this further, this project aims to drive a robot using an automated computer vision embedded system, connecting the robot's vision to its behavior. In order to implement a color recognition system on the robot, open source tools are chosen, such as Processing language, Android system, Arduino platform and Pixy camera. The constraints are clear: simplicity, replicability and financial viability. In order to integrate Robotics, Computer Vision and Image Processing, the robot is applied on a typical mobile robot's issue: line following. The problem of distinguishing the path from the background is analyzed through different approaches: the popular Otsu's Method, thresholding based on color combinations through experimentation and color tracking via hue and saturation. Decision making of where to move next is based on the line center of the path and is fully automated. Using a four-legged robot as platform and a camera as its only sensor, the robot is capable of successfully follow a line. From capturing the image to moving the robot, it's evident how integrative Robotics can be. The issue of this paper alone involves knowledge of Mechanical Engineering, Electronics, Control Systems and Programming. Everything related to this work was documented and made available on an open source online page, so it can be useful in learning and experimenting with robotics.
Grasping information and collaborating through shape displays

The vision to interact with computers through our whole body to not only visually perceive information, but to engage with it through multiple senses has inspired human computer interaction (HCI) research for decades. Shape displays address this challenge by rendering dynamic physical shapes through computer controlled, actuated surfaces that users can view from different angles and touch with their hands to experience digital models, express their ideas and collaborate with each other. Similar to kinetic sculptures, shape displays do not just occupy, rather they redefine the physical space around them. By dynamically transforming their surface geometry, they directly push against hands and objects, yet they also form a perceptual connection with the users gestures and body movements at a distance. Based on this principle of spatial continuity, this thesis introduces a set of interaction techniques that move between touching the interface surface, to interacting with tangible objects on top, and to engaging through gestures in relation to it. These techniques are implemented on custom-built shape display systems that integrate physical rendering, synchronized visual display, shape sensing, and spatial tracking. On top of this hardware platform, applications for computer-aided design, urban planning, and volumetric data exploration allow users to manipulate data at different scales and modalities. To support remote collaboration, shared telepresence workspaces capture and remotely render the physical shapes of people and objects. Users can modify shared models, and handle remote objects, while augmenting their capabilities through altered remote body representations. The insights gained from building these prototype workspaces and from gathering user feedback point towards a future in which computationally transforming materials will enable new types of bodily, spatial interaction with computers. Thesis Supervisor: Prof. Hiroshi Ishii Title: Jerome B. Wiesner Professor of Media Arts and Sciences Program in Media Arts and Sciences
ALPHA/Sim simulation software tutorial

ALPHA/Sim is a general-purpose, discrete-event simulation tool. ALPHA/Sim allows a user to graphically build a simulation model, enter input data via integrated forms, execute the simulation model, and view the simulation results, within a single graphical environment. We introduce ALPHA/Sim and describe how to use ALPHA/Sim to build, simulate, and analyze a simple manufacturing system. In addition, we briefly describe some advanced features and list some sample applications.
Nature-Inspired Metaheuristic Regression System: Programming and Implementation for Civil Engineering Applications

AbstractDeveloping an expert system has been considered as complex and knowledge driven process. This study proposes a nature-inspired metaheuristic regression system that can find appropriate solutions. The system uses a graphical user interface but does not require a mathematical program installation. The user-friendly interface was designed in the MATLAB graphical user interface design environment (GUIDE) and was implemented by MATLAB compiler. The stand-alone system is easy to use and has many functions, including evaluation, use of an opened data file, test set selection, hold-out, cross validation, and prediction to solve many civil engineering problems with simple manipulations on the system interface. Five benchmark functions were used to evaluate the effectiveness of the optimization module. The performance of the proposed regression system was then validated by comparing its solutions obtained for civil engineering problems with those obtained by empirical methods reported previously. Five actua.
Validation and evaluation of model-based cross-talk compensation method in simultaneous /sup 99m/Tc stress and /sup 201/Tl rest myocardial perfusion SPECT

Simultaneous acquisition of /sup 99m/Tc stress and /sup 201/Tl rest myocardial perfusion SPECT has several potential advantages, but the image quality is degraded by cross-talk between the Tc and Tl data. We have previously developed down-scatter and Pb X-ray models for cross-talk compensation. In this work, we validated these models by comparing the crosstalk from /sup 99/Tc to the Tl window calculated using our models with the cross-talk simulated using a combination of the SimSET-MCNP Monte Carlo simulation codes. We have also evaluated the model-based cross-talk compensation method using both simulated data from MCAT phantoms and experimental data from a physical phantom with a myocardial defect. In the studies the Tl distributions were reconstructed from cross-talk contaminated data without cross-talk compensation, with compensation using the model-calculated cross-talk or using the true cross-talk, and were compared with that from uncontaminated Tl data. Results show that the models gave good estimates of both the down-scatter photons and Pb X-rays in the simultaneous dual isotopes myocardial perfusion SPECT. Also, the results show that model-based cross-talk compensation method provided image quality significantly improved as compared to no compensation and very close to that from the separate acquisition.
Netted radar sensing

We consider how networks of radar sensors can offer a counter to stealth technology whilst simultaneously providing more detailed information for improved target classification. Specifically, it is shown how multiple independent sensors can provide an energetically more efficient collector of radar scatter. Further, the relative merits of non-coherent and coherent dependent networks are discussed particularly emphasising the balance between increased performance and increased complexity and cost.
Algebras of minimal rank over perfect fields

Let R(A) denote the rank (also called the bilinear complexity) of a finite-dimensional associative algebra A. A fundamental lower bound for R(A) is the so-called Alder-Strassen (1981) bound: R(A) /spl ges/ 2 dim A-t, where t is the number of maximal two-sided ideals of A. The class of algebras for which the Alder-Strassen bound is sharp, the so-called "algebras of minimal rank", has received wide attention in algebraic complexity theory. We characterize all algebras of minimal rank over perfect fields. This solves an open problem in algebraic complexity theory over perfect fields [as discussed by V. Strassen (1990) and P. Bu/spl uml/rgisser et al. (1997)]. As a by-product, we determine all algebras A of minimal rank with A/rad A /spl cong/ k/sup t/ over arbitrary fields.
UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA E INFORMÁTICA INDUSTRIAL

Peters, Eduardo. Coprocessor for Accelerating Applications Developed with Notification Oriented Paradigm. 2012. 94 f. Dissertação Programa de PósGraduação em Eng. Elétrica e Informática Industrial, Universidade Tecnológica Federal do Paraná. Curitiba, 2012. This work presents a new hardware coprocessor to accelerate applications developed using the Notification-Oriented Paradigm (NOP). A NOP application has the advantages of both event-based programming and declarative programming, enabling higher level software development, improving code reuse, and reducing the number of unnecessary computations. Because a NOP application is composed of a network of small computational entities communicating only when needed, it is a good candidate for a direct hardware implementation. In order to investigate this assumption, a coprocessor that is able to run existing NOP applications was created. The coprocessor was developed in VHDL and tested in FPGAs, providing a decrease of 96% in the number of clock cycles compared to a purely software implementation.
Modeling Of The Subsurface Interface Radar

A finite-difference time-domain (FDTD) method is used to solve the 21 2 D problem of the response of an arbitrary source, in particular, an impulsive point source, in a two-dimensional isotropic inhomogeneous medium. Cosine and sine transforms are used to reduce the three-dimensional problem to two dimensions. The complete solution is obtained by linearly superimposing several transformed field components. This provides great savings in terms of computer storage and run time over the three-dimensional FDTD model. A criterion is given to ensure the stability of this finite difference scheme. Examples of application of this analysis to actual problems such as the subsurface interface radar are illustrated.
Managing vulnerabilities in your commercial-off-the-shelf (COTS) systems using an industry standards effort

Organizations around the world, in every type of industry and market, are moving towards networks that are based on the Internet protocols. In addition, third-party commercial and open source software has become a critical element to these organizations and the infrastructure of networks, utilities, and services they rely upon to function. That means the software problems in these commercial-off-the-shelf (COTS) software products can quickly cause significant difficulties for any organization. When such software problems have security implications, they are referred to as "vulnerabilities. " This paper discusses the ways of finding out about the vulnerabilities that exist in the COTS and open source software products used by an organization, or by the infrastructures that the organization is dependent upon. CVE, the common vulnerabilities and exposures initiative [cve.mitre. org], is a new international, community-based effort from industry, government, and academia that is working to create an organizing mechanism to make finding and fixing these COTS and open source software product vulnerabilities more rapid and efficient.
On the design and multiplier-less realization of digital IF for software radio receivers with prescribed output accuracy

This paper studies the design and multiplier-less realization of the digital IF in software radio receivers. The new architecture consists of a compensator for compensating the passband droop of the conventional cascaded integrator and comb (CIC) filter. The passband droop is improved by a factor of four and it can be implemented with four additions using the sum-of-powers-of-two (SOPOT) coefficients. The decimation factor of the multistage decimator is also reduced so that its output can be fed directly to the Farrow structure for sample rate conversion (SRC), eliminating the need for another L-band filter for upsampling. By so doing, the programmable FIR filter can be replaced by a half-band filter placed immediately after the Farrow structure. As the coefficients of this half-band filter, the multistage decimators and the subfilters in the Farrow structure are constants, they can be implemented without multiplication using SOPOT coefficients. As a result, apart from the limited number of multipliers required in the Farrow structure, the entire digital IF can be implemented without any multiplications. A random search algorithm is employed to minimize the hardware complexities of the proposed IF subject to a given specification in the frequency domain and prescribed output accuracy, taking into account signal overflow and round-off noise. Design results are given to demonstrate the effectiveness of the proposed method.
Current sensor in PCB technology

A novel DC/AC current sensor works on the fluxgate principle. The core in the form of a 7/10 mm ring made of electrodeposited Permalloy is sandwiched into the middle of the printed circuit board (PCB), while the sensor excitation winding is also integrated in the copper layers of the PCB. In order to lower the sensor power consumption, the excitation winding was tuned by a parallel capacitor. The peak-peak/rms ratio of 5.2 was achieved for the excitation frequency of 25 kHz. The open-loop sensor has 100 mA/A sensitivity characteristics with linearity error of 10% and hysteresis below 0.1% in the 1A range.
Edugraph: software to teach computer graphics concepts

Computational processing capacity allows the development of sophisticated interactive animation with different kinds of media resources. Computer games are examples of multimedia software with entertainment and high sophistication characteristics. Such technology allied with cognitive concepts can be used to implement educational software. This poster describes the implementation of a software to teach computer graphics concepts based on entertainment and cognitive criteria.
Formal Verification of Distributed Algorithms in +CAL 2.0

There are some important challenges associated with distributed systems including race conditions and deadlocks. These systems thus should be verified before deployment. Algorithmic verification is a formal technique; it means that the verification is itself performed algorithmically, in contrast to manual or interactive verification. Algorithmic representation of a system can be achieved using +CAL developed by Leslie Lamport. This work aims at removing some of the limitations of the previous version of the +CAL language. We have validated our implementation by verifying some algorithms.
Beamtrees: Compact Visualization of Large Hierarchies

Beamtrees are a new method for the visualization of large hierarchical data sets, such as directory structures and organization structures. Nodes are shown as stacked circular beams such that both the hierarchical structure as well as the size of nodes are depicted. The dimensions of beams are calculated using a variation of the treemap algorithm. Both a two-dimensional and a three-dimensional variant are presented. A small user study indicated that beamtrees are significantly more effective than nested treemaps and cushion treemaps for the extraction of global hierarchical information.
Web Information Retrieval Using Genetic Algorithm-Particle Swarm Optimization

The rapid growth of web pages available on the Internet recently, searching relevant and up-to-date information has become a crucial issue. Information retrieval is one of the most crucial components in search engines and their optimization would have a great effect on improving the searching efficiency due to dynamic nature of web it becomes harder to find relevant and recent information. That's why more and more people begin to use focused crawler to get information in their special fields today. Conventional search engines use heuristics to determine which web pages are the best match for a given keyword. Earlier results are obtained from a database that is located at their local server to provide fast searching. However, to search for the relevant and related information needed is still difficult and tedious. This paper presents a model of hybrid Genetic Algorithm -Particle Swarm Optimization (HGAPSO) for Web Information Retrieval. Here HGAPSO expands the keywords to produce the new keywords that are related to the user search.
Characterizing medium-voltage high-power devices under conventional and soft-switching conditions

Research has intensified to increase the switching frequency or to reduce the power losses in high-power converters. Two different methods were investigated: on the one hand, new devices were developed with an improved hard-switching behavior, on the other hand, soft-switching converter topologies have been proposed. In practice, it becomes very difficult to compare all the published experimental results due to the different current and voltage levels in each experiment. To accommodate medium-voltage device characterization, a new high-power test bench is developed that enables a direct comparison between hard-switching, snubbered and soft-switching (ZCS and ZVS) devices in continuous mode up to 6 kV peak voltage. The test bench consists of two inverter phase legs, which are coupled by an inductor and linked to a common DC-bus. One phase leg is built with a conventional snubber circuit, the second one is realized according to the ARCP-topology enabling ZVS and ZCS characterization. Both legs are cooled by a water cooling system which allows a calorimetric determination of the power losses. Experimental results with standard GTO devices are provided.
Open-ended coaxial probe permittivity measurements on pulverized materials

The open-ended coaxial probe technique can be used to obtain estimates of the permittivities of some solid dielectrics over broad ranges of frequency by measurements on powdered or pulverized samples, but certain problems must be resolved. Such a probe was used with a network analyzer to estimate the permittivities of coal and limestone from reflection coefficients measured on pulverized samples. The bulk density of the pulverized samples for the coaxial probe measurement was determined from auxiliary single-frequency permittivity measurements on the samples at known bulk densities and the permittivities of the solid materials over the frequency range from 0.2 to 20 GHz were then estimated by computations based on the Landau & Lifshitz, Looyenga dielectric mixture equation and solid material densities.
Correctness and Completeness of CASE Tools in Reverse EngineeringSource Code into UML Model

This paper focuses on Computer-aided Software Engineering (CASE) tools that offer functionality for reverse engineering into Unified Modeling Language (UML) models. Such tools can be used for design recovery or round-trip engineering. For these purposes, the quality and correctness of the reverse engineering capability of these tools is of key importance: Do the tools completely reconstruct the UML diagrams? Are the reverse engineering results correct? What kind of information is presented in the result? Based on these questions, we compare eight UML CASE tools (six commercial tools and two open source tools). We evaluate i) the types of inputs that these tools can handle, ii) the types of diagrams that can be reconstructed, iii) the quality of resulting diagrams.
A comparison of four metrics for auto-inducing semantic classes

A speech understanding system typically includes a natural language understanding module that defines concepts, i.e., groups of semantically related words. It is a challenge to build a set of concepts for a new domain for which prior knowledge and training data are limited. In our work, concepts are induced automatically from unannotated training data by grouping semantically similar words and phrases together into concept classes. Four context-dependent similarity metrics are proposed and their performance for auto-inducing concepts is evaluated. Two of these metrics are based on the Kullback-Leibler (KL) distance measure, a third is the Manhattan norm, and the fourth is the vector product (VP) similarity measure. The KL and VP metrics consistently underperform the other metrics on the four tasks investigated: movie information, a children's game, travel reservations, and Wall Street Journal news articles. Correct concept classification rates are up to 90% for the movie task.
TetraNauta: a intelligent wheelchair for users with very severe mobility restrictions

The TetraNauta project is a low cost, fully open steering system to allow people with heavy motor impairments to move in a known environments (hospitals, schools, home, etc.). It minimizes the steering effort, especially in long paths, while caring for user safety. Every TetraNauta wheelchair has a general map of the environment wherein it navigates in automatic mode. It also knows its actual position in the map using on-board sensors that detect absolute positioning marks. The system consists of a traffic management subsystem and wheelchair motion control subsystem. Virtual potential fields as a tool for implementing automatic guidance in the intelligent electric wheelchair are considered.