Miracle-dz/UniFAR-FTUs huggingface dataset:
On the Achievable Throughput of a Multiantenna

A Gaussian broadcast channel (GBC) with single-antenna receivers and antennas at the transmitter is con- sidered. Both transmitter and receivers have perfect knowledge of the channel. Despite its apparent simplicity, this model is, in general, a nondegraded broadcast channel (BC), for which the capacity region is not fully known. For the two-user case, we find a special case of Marton's region that achieves optimal sum-rate (throughput). In brief, the transmitter decomposes the channel into two interference channels, where interference is caused by the other user signal. Users are successively encoded, such that encoding of the second user is based on the noncausal knowledge of the interference caused by the first user. The crosstalk parameters are optimized such that the overall throughput is maximum and, surprisingly, this is shown to be optimal over all possible strategies (not only with respect to Marton's achievable region). For the case of users, we find a somewhat simpler choice of Marton's region based on ordering and successively encoding the users. For each user in the given ordering, the interference caused by users is eliminated by zero forcing at the trans- mitter, while interference caused by users is taken into ac- count by coding for noncausally known interference. Under certain mild conditions, this scheme is found to be throughput-wise asymp- totically optimal for both high and low signal-to-noise ratio (SNR). We conclude by providing some numerical results for the ergodic throughput of the simplified zero-forcing scheme in independent Rayleigh fading.
Using visual textures for sonir textures production an control

This work takes place in the framework of a global research on the synthesis of sonic textures and its control through a gesturebased interaction in a musical practice. In this paper we present different strategies to link visual and sonic textures using similar synthesis processes; theoretical considerations underlying to this problematic are firstly exposed and several personal realizations, illustrating different approaches to design a gesturally controlled audio-visual system, are then described.
The Unbearable Precarity of Pursuing Freedom: A Critical Overview of the Spanish sí soy autónomo Movement

Throughout 2020, the Spanish Government initiated the process of regulating all activities related to platform work with the purpose of ‘chasing the fraud of bogus self-employment’ (PSOE and Unidas Podemos, 2020). Somewhat surprisingly, this initiative was met by a substantial wave of protest from the workers who the government proclaimed to be attempting to protect. In this light, the present research explores the arguments of the Spanish sí soy autónomo (yes I am self-employed) movement in its struggle against the Spanish Government. Drawing from a critical discourse analysis of semi-structured interviews to couriers of Uber Eats, Deliveroo and Glovo, as well as to a representative of an association in favour of the preservation of the self-employed status (N = 20), the main finding is that the pursuit of self-employment status is primarily informed by workers’ attempt to escape the precarious working conditions offered to wage-earners in the Spanish labour market as a whole, rather than by an empirically grounded claim. This suggests that new labour legislation addressing the challenges posed by platform work must not overlook the broader context in which it is intended to unfold – otherwise, it may not only fail to improve the workers’ situation, but also drive them to demand what are, actually, further deregulated legal arrangements. As such, this article’s main contribution to the sociological knowledge consists of pointing out that platform work, specificities notwithstanding, cannot be seen as detached from the broader Work landscape.
Um estudo de caso sobre a implantação de um ambiente de prevenção de intrusões com a ferramenta Suricata

Neste artigo é apresentado um estudo de caso sobre a implantação de um ambiente de prevenção de intrusões em uma rede de computadores de uma instituição de ensino. A arquitetura adotada baseou-se em utilizar um Network Intrusion Prevention System (NIPS) em conjunto com Host Intrusion Prevention System (HIPS), a fim de detectar e bloquear ataques destinados à rede. O software Suricata foi configurado inline, filtrando o tráfego da rede. Para visualização dos logs, a pilha Elasticsearch, Logstash e Kibana (ELK) foi configurada em conjunto com a ferramenta Synesis, permitindo a visualização dos dados através de uma interface Web. Com isso, foi possível detectar e bloquear ameaças, dentre elas varreduras, comunicações originadas por hosts maliciosos entre outras. A partir disso, foram tomadas ações como a adição de novas regras de firewall, criação de uma blacklist, dentre outras medidas que contribuíram para elevar o nível de segurança da rede.
Clustering & Cluster Head Selection Techniques in Mobile Adhoc Networks

In Mobile adhoc Network (MANET) ,networks are formed on-the-fly and devices can leave and join the network during its lifetime. The network thus formed as a whole will be mobile and the devices in the network should be able to detect the presence of other devices and perform the necessary set-up to facilitate communications. Since MANET is considered as a group of mobile terminals, system performance is a challenging task. The throughput and delay factors at the time of mobility and scalability of MANETs is considered as an important feature for efficient processing.Clustering in MANET helps to ensure the performance of MANET to some extent. In the Clustered topology, cluster based routing protocols are used for well-organized routing in MANET. In a Cluster Structure, Cluster Head and Border nodes form a virtual backbone for routing among neighboring clusters. But the Cluster Head selection is an important criterion to be considered because the Cluster Head will be the co-coordinator in Clustered architecture. This comprehensive survey focuses mainly on the cluster Head selection methodology in recently proposed algorithms and the main objectives in choosing a specific node as a cluster head based on its ability in performing the role of the local coordinator, performing transmissions in both intra-cluster and inter-cluster arrangements.
A novel domain of attraction based synthesis of inverse optimal control

This article proposes a novel and systematic methodology for the inverse optimal control (IOC) of a class of input affine nonlinear systems. First, the system is represented in the pseudo‐linear state‐dependent coefficient (SDC) form so as to facilitate the use of matrix algebraic concepts in the design, while preserving the nonlinear system dynamics. Second, the IOC problem which seeks the solution to the Hamilton–Jacobi–Bellman equation is translated to a diagonal stability (D‐stability) problem. Therefore, the general notion of D‐stability, which deals with the characterization of a matrix A∈ℜn×n for the existence of a diagonal matrix Γ∈ℜn×n such that ATΓ+ΓA<0 , is redefined with respect to SDC factored matrices in this work. Consequently, the criteria for the existence (necessary condition) and determination of a diagonal solution (sufficient condition) are formulated in terms of the SDC matrices. It is shown in this work that these criteria can be readily met by the closed‐loop system matrix A^(x)=A(x)−D , for any arbitrary domain Sδ in state‐space, by manipulating only the diagonal elements using the diagonal matrix D constituted by the IOC feedback. In short, the IOC feedback is designed such that the criteria for D‐stability by the closed‐loop system matrix A^(x) is fulfilled. Hence this novel design methodology is meaningfully named as “Inverse optimal control via diagonal stabilization” (IOC‐D). The main advantages of IOC‐D include: (i) guaranteed estimate of the domain of attraction (DOA), (ii) Immense flexibility of design, and (iii) guaranteed closed form solution which makes the design procedure analytic and computationally efficient. Numerical simulations validate the theoretical developments and the overall efficiency of the proposed approach.
Wideband SIW power divider with improved out-of-band rejection

A wideband substrate integrated waveguide (SIW) power divider with enhanced out-of-band rejection is proposed. Periodic butterfly radial slots are etched on top layer of SIW to realise a pass-band combining with high-pass characteristics of SIW. An experimental circuit has been fabricated by the standard printed circuit board process. Simulated results are compared with measured data and good agreement is reported.
Extraction of a nonlinear AC FET model using small-signal S-parameters

The nonlinearities of an RF FET can be obtained by a set of small-signal circuit elements extracted over a range of terminal voltages and temperatures. This study used pulsed S-parameter measurements on a 3 /spl times/ 3 DC-bias-point grid at two different temperatures to obtain electrical and electrothermal nonlinearity coefficients up to the third order. The extracted nonlinear AC model can be used in a Volterra analysis to gain an insight into the distortion mechanisms. The measurement results were in good agreement with the calculated third-order intermodulation values.
Analyzing the Relationship between Campus Environments and Academic Self-Efficacy in College

Low persistence and degree completion rates are of paramount concern for higher education researchers, policymakers, and practitioners. There is some evidence that students’ success in higher education is partially a function of their self-efficacy beliefs, but little is known about how campus environments shape academic self-efficacy. This study aimed to understand the relationship between culturally engaging campus environments and four-year college students’ academic self-efficacy. Authors used regression analysis techniques to analyze a sample of 704 college students at a public four-year university on the East Coast. When controlling for demographic variables and self-reported growth in academic self-efficacy during high school, three of the nine indicators of culturally engaging campus environments were directly associated with positive growth in academic self-efficacy during college. A post-hoc analysis shows that several other indicators of culturally engaging campus environments were also indirectly associated with academic self-efficacy. Implications for research and practice are discussed.
Entrepreneurial engagement by support networks to encourage new venture success among Māori

New Zealand Māori have for some years been rated among the most entrepreneurial people in the world (Frederick & Chittock, 2005), the statistics regarding business start up rates are certainly impressive, however there is some concern over the business failure rate which is almost double that of non-Māori businesses (Frederick & Chittock, 2005). Only 38% of Māori businesses make it past the 3 ½ year mark, and despite attempts to provide support to Māori entrepreneurs this has not improved. This investigation report examines literature surrounding the entrepreneurial process and support networks with the aim to identify where the support networks are currently engaging with entrepreneurs and whether the level of engagement is adequate for the requirements of Māori entrepreneurs. Eight Māori entrepreneurs around New Zealand are interviewed in order to gain some understanding regarding this issue and identify areas where the situation can be improved. The entrepreneurial process is separated into five steps, combining models created by Churchill and Lewis (1983), Greven (1995) and Deakins and Freel (1998). The key results of the research found the lack of information to be a key factor in the intention of entrepreneurs to utilise support networks in the future, the lack of information in some cases led to assumptions regarding the criteria and difficulty of the support service. The research also found that entrepreneurs found stage three of the entrepreneurial process to be the most difficult and there was an obvious lack of assistance in that stage, as most support services tend to be focussed on the first two stages in the process. The key findings as well as other smaller ones provided information where some recommendations could be made for support networks to refocus their efforts and to further enable the dissemination of information. However it is noted that further research is required with a larger and more diverse sample size in order to provide some more practical solutions as what specific support services are required by Māori entrepreneurs. What is obvious from the literature and from the interviews is that network support isn't the solution for entrepreneurs, it is a means by which entrepreneurs are able to find the support, information and solutions they require for their business success.
A Self‐Healable Sulfide/Polymer Composite Electrolyte for Long‐Life, Low‐Lithium‐Excess Lithium‐Metal Batteries

Solid electrolyte‐protected lithium‐metal anodes promise energy‐dense, safe cells. While sulfide solid electrolytes enable facile processability and fast ion transport, they suffer from complex chemo‐mechanical issues, including Li plating‐induced fracture and Li stripping‐induced contact loss. To address these issues, a grafting approach is implemented to functionalize the sulfide solid electrolyte (Li3,85Sn0.85Sb0.15S4) with a self‐healing unit. This leads to a dynamic bonding between the solid electrolyte network and a mechanically robust polymer scaffold, which reversibly accommodates the volume changes of the lithium‐metal anode. Moreover, the approach improves the interfacial contact between the lithium‐metal anode and the composite electrolyte, enabling stable cycling at a mild stack pressure (160 kPa). With a negative to positive capacity ratio equals to 1, pouch full cells with a high‐nickel cathode (nickel content > 90%) and lithium‐metal anode display 92% capacity retention for 140 cycles. Engineering the interface between solid electrolyte and the polymeric binder offers a promising pathway to address the chemo‐mechanical issues.
Monitoring driver fatigue using facial analysis techniques

In this paper, we describe a non-intrusive vision-based system for the detection of driver fatigue. The system uses a color video camera that points directly rewards the driver's face and monitors the driver's eyes in order to detect micro-sleeps (short periods of sleep). The system deals with skin-color information in order to search for the face in the input space. After segmenting the pixels with skin like color, we perform blob processing in order to determine the exact position of the face. We reduce the search space by analyzing the horizontal gradient map of the face, taking into account the knowledge that eye regions in the face present a great change in the horizontal intensity gradient. In order to find and track the location of the pupil, we use gray scale model matching. We also use the same pattern recognition technique to determine whether the eye is open or closed. If the eyes remain closed for an abnormal period of time (5-6 sec), the system draws the conclusion that the person is falling asleep and issues a warning signal.
Study on the Basin Water Pollution Control and Optimization of Network

Based on the inter-governance theory, social network theory and analysis of organizational relationships, as well as water management basin analysis, the basin water governance constitute a large and complex governance network, and the network performance as demonstrated by the network is the effectiveness of water management basin. This paper focuses on the analysis of water basin management network in order to improve the performance of basin water resources management network for the purpose of optimizing the function from the organization, inter-organizational relationships optimization, network optimization optimize the attempt to reform the three angles.
Paper presented at European Council for Energy Efficient Economies (ECEEE) Summer Study 2007 Dynamics of Consumption Session 9, paper 211 Internet-based tools for behaviour change

Internet-based carbon calculators have the potential to be powerful tools for helping people to understand their personal energy use derived from fossil fuels and to take action to reduce the related carbon emissions. This paper reviews twenty-three calculators concluding that in most cases this environmental learning tool is falling short of giving people the ability to accurately monitor their energy use; to receive meaningful feedback and guidance for altering their energy use; or to connect with others also going through the same learning process of saving energy and conserving carbon. This paper presents the findings of research into the accuracy and effectiveness of carbon calculators. Based on the assessment of the calculators the paper discusses the opportunities Internet technology could be offering for engagement, communication, encouragement and guidance on low-carbon lifestyle choices. Finally, recommendations are made for the development of accurate, informative and social Internet-based carbon calculators.
Physical exercise and osteoporosis: effects of different types of exercises on bone and physical function of postmenopausal women Exercício físico e osteoporose: efeitos de diferentes tipos de exercícios sobre o osso e a função física de mulheres pós-menopausadas

Physical exercise is an important stimulus for osteoporosis prevention and treatment. However, it is not clear yet which modality would be better to stimulate bone metabolism and enhance phy- sical function of postmenopausal women. This review paper aims to summarize and update pre- sent knowledge on the effects of different kinds of aquatic and ground physical exercises on bone metabolism and physical function of postmenopausal women. Moderate to intense exercises, performed in a high speed during short intervals of time, in water or on the ground, can be part of a program to prevent and treat postmenopausal osteoporosis. Mechanical vibration has proven to be beneficial for bone microarchitecture, improving bone density and bone strength, as well as increasing physical function. Although impact exercises are recognized as beneficial for the stimulation of bone tissue, other variables such as muscle strength, type of muscle contraction, duration and intensity of exercises are also determinants to induce changes in bone metabolism of postmenopausal women. Not only osteoanabolic exercises should be recommended; activities aimed to develop muscle strength and body balance and improve the proprioception should be encouraged to prevent falls and fractures. Arq Bras Endocrinol Metab. 2014;58(5):514-22
Towards a role-based authentication system based on SSVEP-P300 hybrid brain–computer interfacing

ABSTRACT Billion-dollar investment has been made globally in different industries, and hence, protection of organisational assets against theft or leakage of confidential information becomes a prime objective. Therefore, industries have to build their security system according to the job profile of workers. In this study, a pictorial hybrid brain–computer interface (hBCI) based 2 × 2 speller was proposed that combines P300 with steady-state-evoked potential (SSVEP) reactions to enhance the authentication system’s performance. Each run displays pictures of various objects at four corners of the screen where each location flickers and flashes simultaneously. Here, P300 and SSVEP stimulation are used in such a way that the position of the target picture is detected by SSVEP while the target picture is identified by P300 stimulus. The classification accuracies of hybrid and only P300 system are 97.63% and 94.61%, respectively, while the information transfer rates obtained were 70.34 and 30.26 bit/min, respectively.
H-Shaped Electrically Resonant Terahertz Metamaterials

We designed the H-shaped metamaterial which is used at terahertz frequencies, and it can suppress magnetic response and construct purely electrical resonance. The resonance behaviors and the impact of geometrical parameters of the H-shaped metamaterial were analyzed by using effective circuit model. The simulation results indicate that permittivity of H-shaped metamaterial is negative at terahertz frequencies. H-shaped metamaterial could be used widely in the design of terahertz devices due to its simple structure and easy manufacture.
Discretization error estimates for discontinuous Galerkin isogeometric analysis

Isogeometric analysis is a spline-based discretization method to partial differential equations which show the approximation power of a high-order method. The number of degrees of freedom, however, is as small as the number of degrees of freedom of a low-order method. This does not come for free as the original formulation of isogeometric analysis requires a global geometry function. Since this is too restrictive for many kinds of applications, the domain is usually decomposed into patches, where each patch is parameterized with its own geometry function. In simpler cases, the patches can be combined in a conforming way. However, for non-matching discretizations or for varying coefficients, a non-conforming discretization is desired. An symmetric interior penalty discontinuous Galerkin method for isogeometric analysis has been previously introduced. In the present paper, we give error estimates that are explicit in the spline degree. This opens the door towards the construction and the analysis of fast linear solvers, particularly multigrid solvers for non-conforming multipatch isogeometric analysis.
Traffic-based Malicious Switch Detection in SDN

In Software Defined Networking (SDN) architecture, the control plane is separated from the data plane. On one hand, OpenFlow switches can only store and forward packets, which leaves all decisions to be made by the controller. On the other hand, the controller has a global view over the SDN. But if any switch is captured by an adversary, it may mislead the controller to make inaccurate decisions which may have terrible influences on the overall networks. In this paper, we elaborate on these problems and propose methods to detect malicious OpenFlow switches. We set a threshold value of the traffic-flows across an OpenFlow switch. If the switch’s current traffic-flows exceed the threshold value, the controller has reasons to believe that this switch is suspicious and may monitor it intensively. Another scheme is to add a third-party server to accept users’ report to warn the controller. In SDN, the controller cannot communicate with users directly, and sometimes users need to feed back their experience to the controller to help improve the SDN. In this case, it is necessary to set a third-party server in SDN to act as a middle role. These two schemes help to detect malicious switches. The controller can analyze the flow table of the suspicious switch and identify whether it is really malicious before isolating it.