Miracle-dz/UniFAR-FTUs huggingface dataset:
Real-Time Flight Simulation of Highly Maneuverable Unmanned Aerial Vehicles

This paper focuses on full six degree-of-freedom aerodynamic modeling of small unmanned aerial vehicles at high angles of attack and high sideslip in maneuvers performed using large control surfaces at large deflections for aircraft with high thrust-to-weight ratios. Configurations, such as this, include many of the currently available propeller-driven radio-controlled model airplanes that have control surfaces as large as 50% chord, deflections as high as 50 deg, and thrust-to-weight ratios near 2∶1. Airplanes with these capabilities are extremely maneuverable and aerobatic, and modeling their aerodynamic behavior requires new thinking because using traditional stability-derivative methods is not practical with highly nonlinear aerodynamic behavior and coupling in the presence of high prop-wash effects. The method described outlines a component-based approach capable of modeling these extremely maneuverable small unmanned aerial vehicles in a full six degree-of-freedom real-time environment over the full.
Parallel-series feed network with improved G/T performance for high-gain microstrip antenna arrays

A 16 x 8 microstrip antenna array with 28 dB of gain at 18 GHz using a parallel-series feed with reduced conductor traces is presented. The feed network connects antenna elements with about 50% reduction in conductor traces compared to conventional arrays with equal numbers of radiating elements. It also enhances the gain-bandwidth performance of the array and maintains a broadside radiation pattern in a wider frequency band. The full-wave simulation results are verified by means of measurements that demonstrate a relative gain-bandwidth of 4.4% with less than 1 dB of gain ripple.
Matched filter bound optimization for multiuser downlink transmit beamforming

This paper is devoted to the optimization of the matched filter bounds (MFB) of different co-channel users, using adaptive antenna arrays at base stations for downlink transmit beamforming in cellular mobile communication systems. We mainly consider time division multiple access (TDMA) frequency division duplexing (FDD) based systems. Note that in the case of time division duplexing (TDD), under terrain assumptions the downlink channel can be assumed to be practically the same as the uplink channel. On the contrary, when using FDD, the downlink channel can not be directly observed and estimated. That makes FDD based systems most difficult to deal with, although the proposed criteria and methods are general and suitable for both FDD and TDD. Problem formulations are provided for both spatial division multiple access (SDMA) and non-SDMA spectrum reuse techniques. Novel analytical solutions and algorithms are derived, implementation issues are discussed and simulations are provided in order to compare different approaches.
A cost-effective PCS deployment methodology

RF propagation in multipath environment is random, requiring sophisticated computer aided prediction tools. As a result, traditional methods of RF deployment for low power/low antenna height sites are generally expensive. In an effort to alleviate this problem, this paper presents a simpler and cost-effective deployment method for PCS. The salient concept of the proposed method is to maintain cell radii within the fresnel zone break point. In this region, the path loss slope generally remains constant irrespective of the propagation medium. This analogy is then used to develop a three-ray model for indoor PCS; a two-ray model is then derived for outdoor PCS. Empirical formulae are presented for cell radii and the associated link budget parameters. The proposed method is appropriate for low power PCS and microcellular services, offering a greatly simplified and cost-effective deployment process.
Differential equations of motion for combined flapwise bending, chordwise bending, and torsion of twisted nonuniform rotor blades

The differential equations of motion for the lateral and torsional deformations of twisted rotating beams are developed for application to helicopter rotor and propeller blades. No assumption is made regarding the coincidence of the neutral, elastic, and mass axes, and the generality is such that previous theories involving various simplifications are contained as subcases to the theory presented in this paper. Special attention is given the terms which are not included in previous theories. These terms are largely coupling-type terms associated with the centrifugal forces. Methods of solution of the equations of motion are indicated by selected examples.
CRIAÇÃO DE UM MODELO DE CLASSIFICAÇÃO DE TWEETS EM PORTUGUÊS DO BRASIL RELACIONADOS A CRIMES UTILIZANDO MÁQUINA DE VETORES DE SUPORTE

foi o Notebook, bibliotecas auxiliares foram implementadas técnicas de pré-processamento nos tweets para eliminar informações indesejáveis. O dataset utilizado no experimento é composto por tweets de contas jornalísticas da cidade Belém, Brasil. Os tweets são submetidos a um classificador SVM (Linear e RBF) onde o Linear obteve taxa acerto de 97%.
Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers

Chemical and thermal degradation of electrical insulation in oil-filled transformers, mechanisms of failure and methods of condition monitoring and of life prediction are reviewed. An insulation life prediction model is developed and estimates of insulation life are presented under a variety of oil/paper conditions. Systematic measurements of the concentration of chemical indicators in transformer oil are used to demonstrate that furaldehyde and related products can be used to detect high rates of paper degradation. Similarly, phenol and related products indicate electrical degradation in phenol-formaldehyde resins.
Trickle and Treat? The Critical Role of Marine‐Terminating Glaciers as Icy Macronutrient Pumps in Polar Regions

Nutrient supply to the coastal euphotic zone is critical in sustaining the productivity of ecosystems and provides an important feedback on the carbon cycle via stimulating the biological pump. The supply of coastal nutrients is typically thought to be dominated by terrestrial inputs and upwelling of deep ocean waters. Marine‐terminating glaciers can provide nutrients via both mechanisms but the relative importance of each is dependent on complex physical–biogeochemical processes ranging from those in the glacier drainage system to the ice–ocean interface. Constraining these glacial nutrient supply processes in a remote part of the Canadian Arctic Archipelago (CAA) is the focus of a new study by Williams et al. (2021, https://doi.org/10.1029/2021JG006289). Their findings advance our understanding of the role glaciers play in polar nutrient cycling by highlighting significant shallow meltwater pumping of macronutrient‐replete marine waters by CAA marine‐terminating glaciers into the euphotic zone.
The study of antilock braking system based on sliding mode variable structure control

The friction characteristic between road surface and tire makes the anti-lock braking system (ABS) take on the properties of nonlinearity, time variation and uncertainties. The sliding mode variable structure controller (SMVSC) has strong robust ability in dealing with uncertainties including the model error and unknown interference, so SMVSC is used in ABS extensively. In order to achieve expected performance, SMVSC has to identify the road characteristics in real time. The mathematical model of ABS is established, and the application of SMVSC in ABS is realized. One kind of estimation algorithm of optimal slip ratio based on the shape of μ-λ curve is proposed. By computer simulation, the feasibility and validity of SMVSC based on optimal slip ratio is verified.
Towards a Dual Process Conception of the Selective Influence of Financial Literacy on Economic Behavior

While many studies examined the relationship between financial literacy and economic behavior, no fundamental theory that explains the mechanism by which financial knowledge influences behavior has yet emerged. This dissertation addresses this research gap by presenting a new theoretical model for financial literacy – the Cognitive Modulation of Economic Behavior [CMEB] that relates the availability of cognitive and mental resources with factors that influence individuals’ ability to rely on their knowledge: (i) the personal characteristics of the decision-maker, and (ii) the characteristics of the task that he or she wishes to perform. The influence of cognitive and mental resources, and task features, on the ability to apply financial knowledge when needed, was investigated in four different studies. Results indicate that the CMEB model explains the wide-ranging influence of financial literacy on economic behavior. By presenting a model that focuses on the influence of cognitive and mental resources on financial literacy-based behavior, this work expands our understating of the mechanism by which financial literacy operates. The CMEB model can serve as a basis for many theoretical advancements that are still needed in this field of research.
Status of IVHS technical developments in the United States

The authors address the state of domestic technical developments in the five components of intelligent vehicle highway systems (IVHS): advanced traffic management systems (ATMS), advanced traveler information systems (ATIS), advanced vehicle control systems (AVCS), commercial vehicle operations (CVO), and advanced public transportation systems (APTS). Each component and current operational tests are briefly described. Particular emphasis is given to three current large-scale operational field tests (Pathfinder, TravTek, and ADVANCE) to illustrate the integration of the IVHS components. <<ETX>>
Ultra-High Nonlinear Chalcogenide Planar Waveguide for Four-Wave Mixing Based Time-Division Demultiplexing of a 160 Gb/s Optical Signal

All-optical time-division demultiplexing of a 160 Gb/s signal into its tributary 10 Gb/s channels is demonstrated by four-wave mixing in just a 50 mm length As2S3waveguide exhibiting ultra-high optical Kerr nonlinearity over 2000 W−1km−1.
Faster, Better, Cheaper in the Context of Systems Engineering

Abstract: This article compares the Faster, Better, Cheaper approach for National Aeronautics and Space Administration (NASA) programs to what are generally considered traditional systems engineering practices. A description of these approaches is followed by a direct comparison of the two methodologies. The comparison shows that projects using the Faster, Better, Cheaper method do not deviate greatly from traditional systems engineering principles, but instead constitute a focusing of missions toward a new set of strategic goals for NASA. Future work in this area is also discussed.
Överreaktion och säsongseffekt på den svenska aktiemarknaden

Mojligheten att prediktera framtida aktiekurser baserat pa historisk data och uppvisade trender har sina foresprakare och motstandare. I denna studie undersoks om man genom att studera tidigare utveckling hos aktier kan uppna overavkastning, ett tydligt brott mot svag marknadseffektivitet. Detta gors genom att testa den sa kallade overreaktionshypotesen som sager att pa lang sikt kommer aktier som presterat daligt under tidigare period prestera battre an tidigare vinnare. Denna metod tillampas pa den svenska aktiemarknaden och sasongseffekter och riskens betydelse undersoks. Resultaten visar att det inte existerar nagon overreaktion pa den svenska aktiemarknaden. Daremot upptacks ett skifte dar tidigare forloraraktier presterar battre an tidigare vinnaraktier. Resultaten visar att denna effekt inte kan forklaras av riskkompensation utan av forekomsten av en sasongseffekt. Denna sasongseffekt ar endast statistiskt signifikant i januari och ar saledes en manifestation av januarieffekten.
ENHANCING THE PRIME CONTRACTOR'S PRE-CONSTRUCTION PLANNING

Technological advancements and continuous fragmentation of the construction industry have resulted in a spiral increase in complexity of building projects. The changes the construction industry has experienced in recent years have influenced production rates, techniques and procedures. Also types of materials, plant and other resources used have being changing. The effect of these continuous changes is exacerbated by the continuous demand for speed, zero defects, higher safety, welfare and environmental standards. Unfortunately, this spiral increase in complexity is not being matched with an equal increase in planning effort, especially at the pre-construction stage. Contractors have failed to adjust their planning to a more detailed level such as the "role" level. The industry still plan projects at the activity level. The failure to plan projects at role level is widening the gap between contractors, subcontractors and the operatives. This is obvious by the lack of use of scientific management tools (such as work-study) on today's construction sites. All these problems make pre-construction planning to be an increasingly important ingredient for successful delivery of projects. Good pre-construction planning can only have a fruitful effect if the production process is well understood and is carefully planned at the right level, at the right time, and using the right procedure, expertise and experience. This paper therefore, proposes a simple systemic approach or model that can be used in practice to improve and standardise the process of the prime contractor's planning of construction projects at the pre-construction stage. The uniqueness of the proposed approach is stems from planning at the role level and focusing on the effect of project complexity on project time and cost. The work described in the paper is based upon structured interviews with selected practitioners and case studies on current practice in the South East of England. The work concluded that the implementation of the proposed system of pre-construction planning will contribute to capturing knowledge and experience and to producing consistency and reliability in practice, and thus produce innovation and value in project systems implementation with more reliable predictions of construction project time and cost.
PARADIGM: a buoy-based system for AUV navigation and tracking

A large variety of Autonomous Underwater Vehicles (AUVs) are currently under development or in production. In order for an AUV to be useful, its self-navigation capabilities must support the mission requirements. Often, underwater acoustic navigation techniques must be utilized in order to meet the navigational accuracy requirements. In addition to vehicle self-navigation, most AUV operators also require a method of tracking the vehicle while it is underway, so that its progress may be monitored, and also so that it may be located easily upon surfacing, or in the event of a vehicle failure. The Woods Hole Oceanographic Institution (WHOI) has developed a buoy-based system that simultaneously provides for both vehicle self-navigation and external tracking. This system has been used extensively by WHOI to support the REMUS AUV operations, and has also been used by the Naval Oceanographic Office to support sea-trials of the LAZARUS vehicle system. Long Baseline Acoustic Navigation is often the preferred subsea navigation method. It is generally accomplished by deploying two or more acoustic transponders, moored to the seafloor, near the desired area of operations. The vehicle then interrogates the transponders, determines its range to each, and finds its position using triangulation techniques. WHOI has developed a radio-controlled buoy, which can serve as a navigation transponder for the vehicle, and can also be commanded via the radio link to interrogate the AUV and report the measured travel time back to the operator. This paper describes the PARADIGM (Portable Acoustic RADio Geo-referenced Monitoring) system architecture, and presents data describing results achieved.
7.2.2 Advancing Model‐Based Systems Engineering at a Small Space Agency

This paper reviews recent and current efforts to implement Model‐Based Systems Engineering at the Canadian Space Agency. A mission under concept development is being used both for demonstration purposes and also for real process design with SysML. Several support and bridge tools have been developed to help with key process issues. A number of technology issues have come out of our work, leading to a wish list of improvements we would like to see. Also, we have been dealing with organizational resistance that is preventing a wider acceptance of MBSE.
Design and experimental testing of the OctArm soft robot manipulator

This paper describes the development of the octopus biology inspired OctArm series of soft robot manipulators. Each OctArm is constructed using air muscle extensors with three control channels per section that provide two axis bending and extension. Within each section, mesh and plastic coupler constraints prevent extensor buckling. OctArm IV is comprised of four sections connected by endplates, providing twelve degrees of freedom. Performance of OctArm IV is characterized in a lab environment. Using only 4.13 bar of air pressure, the dexterous distal section provides 66% extension and 380° of rotation in less than . 5 seconds. OctArm V has three sections and, using 8.27 bar of air pressure, the strong proximal section provides 890 N and 250 N of vertical and transverse load capacity, respectively. In addition to the in-lab testing, OctArm V underwent a series of field trials including open-air and in-water field tests. Outcomes of the trials, in which the manipulator demonstrated the ability for adaptive and novel manipulation in challenging environments, are described. OctArm VI is designed and constructed based on the in-lab performance, and the field testing of its predecessors. Implications for the deployment of soft robots in military environments are discussed.
Alignability vs. bandwidth and signal-to-noise ratio for optical interconnects

It is desirable to design an optical interconnect so that it has high bandwidth, signal-to-noise ratio, and alignability. Examining the relationship between the alignability and bandwidth and the alignability and signal-to-noise ratio shows that increasing the alignability can lead to a simultaneous increase in the signal-to-noise ratio, but a decrease in the bandwidth. To find a design which balances these opposing effects, the product of alignability, signal-to-noise ratio, and bandwidth is plotted versus the normalized detector size of the interconnect. The peak of this curve yields the optimum detector size for the given physical interconnect design. Using this detector size, the interconnect's signal power and receiver parameters can be altered, as needed, to yield the required bandwidth and signal-to-noise ratio.
A methodology for modeling VVT risks and costs

The cost of large systems' Verification, Validation, and Testing (VVT) is in the neighborhood of 40% of the total life cycle cost. The cost associated with systems' failures is even more dramatic, often exceeding 10% of industrial organizations turnover. There is a great potential benefit in streamlining and optimizing the VVT process. The first step in accomplishing this aim is to define a VVT strategy and then to quantify the cost and risk associated with carrying it out. This paper provides an overview of the methodologies for risk and cost monitoring for VVT and proposes a novel approach for modeling VVT strategies as decision problems. A quantitative VVT process and risk model is proposed. Due to the nondeterministic nature of risk, simulation is used to generate distributions of possible costs, schedules, and risk outcomes. These distributions represent a probabilistic approach and are analyzed in relation to impact events. The model provides means to explore different VVT strategies for optimizing relevant decision parameters. To demonstrate the proposed procedure the paper describes a case study depicting a planned avionics suite upgrade program for a fighter aircraft. Some simplified partial quantitative results are also presented. © 2003 Wiley Periodicals, Inc. Syst Eng 6: 135–151, 2003
Development of a laser scanner for measuring tree canopy characteristics: Phase 1. Prototype development

Automatically measuring canopy characteristics is an essential step for tree-specific management of a grove. Alaser scanning system and corresponding algorithms were developed for potential use in measurement of tree canopy height,width, and volume. Tests with fixed-length PVC pipes demonstrated that the system had accuracies of 97% for length measurementsin three perpendicular directions with coefficients of variation (CV) less than 4%. Volume measurement of a rectangularbox gave a CV of 5.4% and a relative error of 4.4%. Spatial resolution of the system was estimated to be smaller than6.0 cm (horizontal) × 1.9 cm (vertical) for potential field applications.
5.1.1 Applying Systems Architecture to Technology Policy Research: Models of Space Activity in Developing Countries

This paper presents results from a study on emerging satellite programs in developing countries. A Systems Architecture Framework is used as a tool to enable social science research in technology policy. The study finds that the Architectural Framework is useful for integrating concepts from disparate literature communities; decomposing a socio‐technical system into progressively lower levels of analysis; and synthesizing findings to enable explanation and theory building.
Improving Green Product Design with Closed-Loop Product Recovery Information

It is widely agreed that environmental issues, from climate change to energy and water scarcity, to over exploitation of natural resources, represent critical challenges for the society. Thereby, industry has progressively adopted lean manufacturing by reducing amount of energy and materials used in the production. However, manufacturer has limitation towards improving product efficiency without feedback from user as a close loop. Knowing the complexity of environmental issues and economy changes, this paper introduces a new system framework that takes the holistic approach by capturing information at end-of-life (EoL) and feeding back to design or manufacturing in making a greener product. With complete understanding of EoL product status, it enables OEMs to develop technology diversely and at the same time rapidly incorporating environmental concept in part of the product chain. For instance, the valuable knowledge learned in EoL product put forward a more efficient way for product maintenance by cutting down time, cost and negative impact to the environment. Moreover, a greater reliable product could be achieved by utilizing appropriate material or design in particular product. This resulted in improved product design as an inherent loop in product life cycle, therefore producing greener product for better reusability, remanufacturability and recyclability. Overall, efficient EoL product recovery system enables sustainable and competitive manufacturing, and thus drives the economy growth.
AWARENESS, KNOWLEDGE, AND PERCEPTION OF AMBLYOPIA AMONG PARENTS ATTENDING PEDIATRIC AND OPHTHALMOLOGY CLINICS AT KASCH RIYADH

Malak Mansour Alhaddab 1 , Afaf Moukaddem 2 and Bashaer Dabsan Albaqami 3 . 1. Faculty of Medicine. King Saud Bin Abdulaziz University for Health sciences. Riyadh. Saudi Arabia. 2. Faculty of Medicine Research Unit. King Saud Bin Abdulaziz University for Health sciences. Riyadh. Saudi Arabia. 3. Pediatric department. King Abdullah Specialist Children Hospital. Riyadh. Saudi Arabia. Manuscript Info Abstract . Manuscript History Received: 10 September 2019 Final Accepted: 12 October 2019 Published: November 2019