Miracle-dz/UniFAR-FTUs huggingface dataset:
The Validation of the Novel DVB-H Radio Channel Models

This paper provides results of the radio channel measurements performed in DVB-H network during autumn 2006. The purpose of these measurements was to acquire additional channel information in order to validate the channel models constructed from the earlier measurements [1], [2]. This paper presents the most relevant results of the measurements including Ricean K-factors, RMS delay spreads, total excess delays and the variations of the number of taps. By comparing these results to those presented in [1] can be stated that the values are similar. Therefore, the original models can be considered consistent.
Simulation of magnetic field distribution of opposite-poles single-disc Permanent Magnet Rotor

The study development regarding Axial Flux Permanent Magnet Generator (AFPMG) has been increasingly interesting, since its construction is simple and easy to construct; permanent magnet type NdFeB has high density, available everywhere and relatively low cost; without using brushes and slip ring, thus the maintenance cost can be low, long usage duration, direct drive connection. These will affect in the increasing efficiency and reliability. One of the problems which remain to be the main issue in AFPMG is rotor disc dimension influenced by distance between magnets in rotor disc. This paper discussed magnetic field distribution simulation between permanent magnet NdFeB type N40 with diameter dimension 40 mm and 10 m in height on different pole rotor disc in order to obtain the minimum disc dimension with maximum magnetic flux distribution. Simulation was performed by Finite Element Method Magnetics (FEMM). The simulation result was presented in the form of magnetic field distribution geometry on two permanent magnets inside rotor disc. It showed that the magnetic field strength in the midpoint between different pole single rotor was very low (44 mT) on the distance of 25 mm.
A double-layer miniaturized dual band frequency selective surface

A novel double layer Dual Band Frequency Selective Surface (FSS)with miniaturized element is presented, in which each periodic cell consists of parallel metallic patch of two different sizes. The FSS with such structure is designed, The simulated results show that the FSS dimension is miniaturized to 0.06 λ (λ refers to the resonant wavelength of 2GHz). In addition, it also has good stability to oblique incidence waves for both TE and TM polarization, and there is no other resonance frequency up to 10 GHz. The influence of dimension parameters on FSS performances has been investigated. Then, dual-band FSS operated at 2GHz and 3.45GHz is designed. Simulated results indicate that the miniaturized FSS also provides good transmission response.
How Much is Investor Autonomy Worth?

There is a worldwide trend towards defined contribution savings plans, where investors are often able to select their own portfolios. How much is this freedom of choice worth? We present retirement investors with information about the distribution of outcomes they could expect to obtain from the portfolios they picked for themselves, and the same information for the median portfolio selected by their peers. A majority of our survey participants actually prefer the median portfolio to the one they picked for themselves. We investigate various explanations for these findings and offer some evidence that the results are partly attributable to the fact that investors do not have well-defined preferences. Copyright The American Finance Association 2002.
Chimpanzees (Pan troglodytes) Fail a What-Where-When Task but Find Rewards by Using a Location-Based Association Strategy

Recollecting the what-where-when of an episode, or episodic-like memory, has been established in corvids and rodents. In humans, a linkage between remembering the past and imagining the future has been recognised. While chimpanzees can plan for the future, their episodic-like memory has hardly been investigated. We tested chimpanzees (Pan troglodytes) with an adapted food-caching paradigm. They observed the baiting of two locations amongst four and chose one after a given delay (15 min, 1 h or 5 h). We used two combinations of food types, a preferred and a less preferred food that disappeared at different rates. The subjects had to base their choices on the time elapsed since baiting, and on their memory of which food was where. They could recover either their preferred food or the one that remained present. All animals failed to obtain the preferred or present foods above chance levels. They were like-wise unsuccessful at choosing baited cups above chance levels. The subjects, thus, failed to use any feature of the baiting events to guide their choices. Nonetheless, their choices were not random, but the result of a developed location-based association strategy. Choices in the second half of the study correlated with the rewards obtained at each location in the first half of the study, independent from the choices made for each location in the first half of the study. This simple location-based strategy yielded a fair amount of food. The animals' failure to remember the what-where-when in the presented set-up may be due to the complexity of the task, rather than an inability to form episodic-like memories, as they even failed to remember what was where after 15 minutes.
Multiple Access for Visible Light Communications: Research Challenges and Future Trends

The ever-increasing demand of mobile Internet and multimedia services poses unique and significant challenges for current and future generation wireless networks. These challenges are mainly related to the support of massive ubiquitous connectivity, low latency, and highly efficient utilization of spectrum resources. Therefore, it is of a paramount importance to address them in the design and deployment of future wireless networks. To this end, this paper provides a comprehensive overview of multiple access schemes in the context of visible light communications (VLC). Specifically, we initially provide a thorough overview of frequency-domain multiple access techniques for single- and multi-carrier systems, which is then followed by an in-depth discussion on the technical considerations of optical code-division multiple access techniques and their adoption in indoor VLC applications. Furthermore, we address space-division multiple access and, finally, we revisit and analyze a new promising technology, namely, non-orthogonal multiple access (NOMA). It is shown that NOMA exhibits significant benefits in VLC systems that can outperform conventional multiple access schemes, rendering it a particularly effective solution. Furthermore, it is demonstrated that it can coexist with the above optical multiple access schemes, which can maximize the performance and efficiency of future VLC systems. However, it is also shown that the potential of NOMA in VLC systems requires efficient addressing of a series of related challenges and constraints, such as fast and effective successive interference cancellation techniques, compensation and mitigation of LED non-linearity, and imperfect and/or outdated channel state information.
Performance improvement of face recognition algorithms using occluded-region detection

Facial occlusions such as eyeglasses, hairs and beards decrease the performance of face recognition algorithms. To improve the performance of face recognition algorithms, this paper proposes a novel framework of face recognition combined with the occluded-region detection method. In this paper, we detect occluded regions using Fast-Weighted Principal Component Analysis (FW-PCA) and use the occluded regions as weights for matching face images. To demonstrate the effectiveness of the proposed framework, we use two face recognition algorithms: Local Binary Patterns (LBP) and Phase-Only Correlation (POC). Experimental evaluation using public face image databases indicates performance improvement of the face recognition algorithms for face images with natural and artificial occlusions.
Revisiting RDMA Buffer Registration in the Context of Lightweight Multi-kernels

Lightweight multi-kernel architectures, where HPC specialized lightweight kernels (LWKs) run side-by-side with Linux on compute nodes, have received a great deal of attention recently due to their potential for addressing many of the challenges system software faces as we move towards exascale and beyond. LWKs in multi-kernels implement only a limited set of kernel functionality and the rest is supported by Linux, for example, device drivers for high-performance interconnects. While most of the operations of modern high-performance interconnects are driven entirely by user-space, memory registration for remote direct memory access (RDMA) usually involves interaction with the Linux device driver and thus comes at the price of service offloading. In this paper we introduce various optimizations for multi-kernel LWKs to eliminate the memory registration cost. In particular, we propose a safe RDMA pre-registration mechanism combined with lazy memory unmapping in the LWK. We demonstrate up to two orders of magnitude improvement in RDMA registration latency and up to 15% improvement on MPI_Allreduce() for large message sizes.
EVOLUTIONARY DISTANCE MODEL BASED ON DIFFERENTIAL EQUATION AND MARKOV PROCESS

Evolutionary distance is a measure of evolutionary divergence time between two homologous sequences. It is fundamental for the study of molecular evolution. In this paper, we exploit one-parameter model and two-substitution model using the differential equation and the Markov process in stochastic process. Through them, we can acquire the evolutionary distance between two sequences as estimated number of changes that have occurred per site. Experimental results are evaluated through Monte Carlo experiments demonstrating the usefulness of one-parameter model and two-substitution model, and comparing two models, the two-substitution model may get better accuracy than one-parameter model.
Phenotypic heterogeneity in the NCI-H125 cell line affects biological activity using the epidermal growth factor receptor as target / Fenotipska heterogenost u staničnoj liniji NCI-H125 utječe na biološku aktivnost na receptore za epidermalni faktor rasta

We evaluated the influence of some morphological changes of the NCI-H125 cell line in surface expression of the epidermal growth factor receptor (EGFR) and their impact on some biological activity assays using this molecule as target. Hematoxylin and eosin (H/E) staining, light microscopy immunocytochemistry, flow cytometric antibody-receptor binding test, cell viability determination and cell cycle analysis were performed. Phenotypic changes and inconsistency in EGFR expression were detected in NCI-H125 cell cultures. A significant reduction in the growth rate, mainly characterized by cell cycle arrest in the G0-G1 phase, was also evidenced. Differential distribution of cell viability in NCI-H125 subpopulations and its relationship with the EGFR surface expression were determined. Nuclear alterations observed in NCI- -H125 were not apoptosis related. A lack of control of cell cultures affects the reliability and reproducibility of biomedical and biotechnological research using EGFR as target. Therefore, rigorous control of the above mentioned parameters in these experiments is recommended. U članku je opisan utjecaj morfoloških promjena na staničnoj liniji NCI-H125 koje su povezane s površinskom ekspresijom receptora za epidermalni faktor rasta (EGFR) i njihov utjecaj na biološko djelovanje. U radu je korišteno bojanje s hematoksilinom i eozinom (H/E), imunocitokemijska mikroskopija, test vezanja protutijela na receptor pomoću protočne citometrije, testovi vijabilnosti stanica i analiza staničnog ciklusa. U staničnoj kulturi NCI-H125 detektirane su promjene fenotipa i nedosljednost u ekspresiji EGFRa. Primijećena je značajna redukcija rasta, uglavnom zbog zadržavanja staničnog ciklusa u G0-G1 fazi, te različitost u vijabilnosti NCI-H125 subpopulacije i povezanost s ekspresijom EGFRa na površini. Primijećena različitost u jezgri NCI-H125 stanica nije povezana s apoptozom. Nemogućnost kontroliranja stanične kulture utječe na pouzdanost i ponovljivost biomedicinskih i biotehnoloških istraživanja koja su usmjerena na EGFR. Stoga se preporuča stroga kontrola svih opisanih parametara.
Theta Series Approximation with Applications to Compute-and-Forward Relaying

Computing the theta series of an arbitrary lattice, and more specifically a related quantity known as the flatness factor, has been recently shown to be important for lattice code design in various wireless communication setups. However, the theta series is in general not known in closed form, excluding a small set of very special lattices. In this article, motivated by the practical applications as well as the mathematical problem itself, a simple approximation of the theta series of a lattice is derived. In relation to this, maximum-likelihood decoding in the context of compute-and-forward relaying is studied. Following previous work, it is shown that the related metric can exhibit a flat behavior, which can be characterized by the flatness factor of the decoding function. Contrary to common belief, we note that the decoding metric can be rewritten as a sum over a random lattice only when at most two sources are considered. Using a particular matrix decomposition, a link between the random lattice and the code lattice employed at the transmitter is established, which leads to an explicit criterion for code design, in contrast to implicit criteria derived previously. Finally, candidate lattices are examined with respect to the proposed criterion using the derived theta series approximation.
Search based software test data generation for structural testing: a perspective

Software testing is an important and expensive phase of the software development life cycle. Over the past few decades, there has been an ongoing research to automate the process of software testing but the attempts have been constrained by the size and the complexity of software especially due to the use of dynamic memory allocation which makes the software behavior highly unpredictable. The use of metaheuristic global search techniques for software test data generation has been the focus of researchers in recent years. Many new techniques and hybrid methods have been proposed to tackle the problem more effectively. This study provides an overview of the various techniques that have been applied for structural test data generation. It also presents the open areas, challenges and future directions in the field of search based software testing with an emphasis on test data generation for structural testing.
Transport Capacity and Spectrum Efficiency of Large Wireless CDMA Ad Hoc Networks with Retransmission Diversity

In this paper, we study the transport capacity in packet-meters per slot per node and the space time spectrum efficiency in bit-meters per Hz per second per square meter for large wireless CDMA ad hoc networks, considering optimization of MAC and routing protocols and fixed physical layer. The node density and processing gain tend to infinity with their ratio kept a constant. The limiting network consists of infinitely dense, sender uniformly distributed, mutually independent, and memoryless Gaussian channels on the entire 2-D plane. The MMSE receiver, decorrelator, and matched filter are employed in packet demodulation. Retransmission diversity gain for packets of multiple transmissions is considered. Markov chain property is applied to derivation of steady link throughput and link packet delay. The transport capacity, space time spectrum efficiency, packet delay, and average number of hops with an arbitrary source-destination distribution are obtained all in closed form. While multiuser detection gain vanishes in low and high network load regimes, retransmission diversity gain 10log10m dB in SIR for a packet of m transmissions is independent of network load. As the network load tends to infinity, retransmission diversity, if exploited, endows the network with a constant or increasing space time spectrum efficiency; otherwise vanishing.
Programming With Models: Writing Statistical Algorithms for General Model Structures With NIMBLE

ABSTRACT We describe NIMBLE, a system for programming statistical algorithms for general model structures within R. NIMBLE is designed to meet three challenges: flexible model specification, a language for programming algorithms that can use different models, and a balance between high-level programmability and execution efficiency. For model specification, NIMBLE extends the BUGS language and creates model objects, which can manipulate variables, calculate log probability values, generate simulations, and query the relationships among variables. For algorithm programming, NIMBLE provides functions that operate with model objects using two stages of evaluation. The first stage allows specialization of a function to a particular model and/or nodes, such as creating a Metropolis-Hastings sampler for a particular block of nodes. The second stage allows repeated execution of computations using the results of the first stage. To achieve efficient second-stage computation, NIMBLE compiles models and functions via C++, using the Eigen library for linear algebra, and provides the user with an interface to compiled objects. The NIMBLE language represents a compilable domain-specific language (DSL) embedded within R. This article provides an overview of the design and rationale for NIMBLE along with illustrative examples including importance sampling, Markov chain Monte Carlo (MCMC) and Monte Carlo expectation maximization (MCEM). Supplementary materials for this article are available online.
Nonconvex Optimization for Communication Systems

Convex optimization has provided both a powerful tool and an intriguing mentality to the analysis and design of communication systems over the last few years. A main challenge today is on nonconvex problems in these application. This paper presents an overview of some of the important nonconvex optimization problems in point-to-point and networked communication systems. Three typical applications are covered: Internet congestion control through nonconcave network utility maximization, wireless network power control through geometric and sigmoidal programming, and DSL spectrum management through distributed nonconvex optimization. A variety of nonconvex optimization techniques are showcased: from standard dual relaxation to sum-of-squares programming through successive SDP relaxation, signomial programming through successive GP relaxation, and leveraging the specific structures in problems for efficient and distributed heuristics.
Non-compositional Representation inConnectionist

I show that despite a recent argument to the contrary, connection-ist representations can be non-compositional. This is not because they have context-sensitive constituents, but rather because they sometimes have no constituents at all. The argument to be rejected depends on the assumption that one can only assign propositional contents to representations if one starts by assigning sub-propositional contents to atomic representations. I give some philosophical arguments and present a counterexample to show that this assumption is mistaken.
Trajectory Tracking Control of Nonholonomic Hamiltonian Systems via Generalized Canonical Transformations

This paper is devoted to a unified approach to trajectory tracking control of nonholonomic portcontrolled Hamiltonian systems via generalized canonical transformations. The basic strategy of this approach is to construct an error system, which describes the dynamics of the tracking error, by a passive port-controlled Hamiltonian system. This technique works for both holonomic and nonholonomic port-controlled Hamiltonian systems. A practical design procedure to derive global tracking controllers for those systems is proposed. This method is a natural extension of the conventional passivity based control.
Silicon models of visual cortical processing

Receptive field structures found in the visual cortex of the mammalian brain act as oriented, localized spatial frequency filters. There has been interest in the use of such receptive field profiles for image coding and texture processing. These receptive field structures resemble Gabor filters. Systems employing such Gabor filters have been implemented in software for a variety of applications. We believe a hardware implementation of such cells will be helpful in artificial visual processing. We have implemented analog VLSI cells whose outputs resemble the receptive field profiles found in the visual cortex. We describe experimental results of our circuit. Our circuit is the first silicon model of visual cortical processing.
Large-Scale Assessment of Mediterranean Marine Protected Areas Effects on Fish Assemblages

Marine protected areas (MPAs) were acknowledged globally as effective tools to mitigate the threats to oceans caused by fishing. Several studies assessed the effectiveness of individual MPAs in protecting fish assemblages, but regional assessments of multiple MPAs are scarce. Moreover, empirical evidence on the role of MPAs in contrasting the propagation of non-indigenous-species (NIS) and thermophilic species (ThS) is missing. We simultaneously investigated here the role of MPAs in reversing the effects of overfishing and in limiting the spread of NIS and ThS. The Mediterranean Sea was selected as study area as it is a region where 1) MPAs are numerous, 2) fishing has affected species and ecosystems, and 3) the arrival of NIS and the northward expansion of ThS took place. Fish surveys were done in well-enforced no-take MPAs (HP), partially-protected MPAs (IP) and fished areas (F) at 30 locations across the Mediterranean. Significantly higher fish biomass was found in HP compared to IP MPAs and F. Along a recovery trajectory from F to HP MPAs, IP were similar to F, showing that just well enforced MPAs triggers an effective recovery. Within HP MPAs, trophic structure of fish assemblages resembled a top-heavy biomass pyramid. Although the functional structure of fish assemblages was consistent among HP MPAs, species driving the recovery in HP MPAs differed among locations: this suggests that the recovery trajectories in HP MPAs are likely to be functionally similar (i.e., represented by predictable changes in trophic groups, especially fish predators), but the specific composition of the resulting assemblages may depend on local conditions. Our study did not show any effect of MPAs on NIS and ThS. These results may help provide more robust expectations, at proper regional scale, about the effects of new MPAs that may be established in the Mediterranean Sea and other ecoregions worldwide.