gebhart/patrepeval huggingface dataset:
Enabling FDD Massive MIMO through Deep Learning-based Channel Prediction (2019)

A major obstacle for widespread deployment of frequency division duplex (FDD)-based Massive multiple-input multiple-output (MIMO) communications is the large signaling overhead for reporting full downlink (DL) channel state information (CSI) back to the basestation (BS), in order to enable closed-loop precoding. We completely remove this overhead by a deep-learning based channel extrapolation (or "prediction") approach and demonstrate that a neural network (NN) at the BS can infer the DL CSI centered around a frequency $f_\text{DL}$ by solely observing uplink (UL) CSI on a different, yet adjacent frequency band around $f_\text{UL}$; no more pilot/reporting overhead is needed than with a genuine time division duplex (TDD)-based system. The rationale is that scatterers and the large-scale propagation environment are sufficiently similar to allow a NN to learn about the physical connections and constraints between two neighboring frequency bands, and thus provide a well-operating system even when classic extrapolation methods, like the Wiener filter (used as a baseline for comparison throughout) fails. We study its performance for various state-of-the-art Massive MIMO channel models, and, even more so, evaluate the scheme using actual Massive MIMO channel measurements, rendering it to be practically feasible at negligible loss in spectral efficiency when compared to a genuine TDD-based system.
Simulation Models for Predicting Durability of Insect-resistant Germ Plasm: Hessian Fly (Diptera: Cecidomyiidae)-resistant Winter Wheat (1986)

In an attempt to determine what strategies of resistant germ plasm deployment would most successfully inhibit Hessian fly, Mayetiola destructor (Say), adaptation to wheat resistance factors while offering significant crop protection, a computer simulation model was developed to mimic ecological/genetic interactions between Hessian fly populations and resistant winter wheat. Durability of the following resistant germ plasm deployment strategies was examined: 1) sequential release of two pure cultivars, each with a single resistance factor, 2) release of a random spatial mixture of these two cultivars, 3) release of a pure cultivar in which both resistance factors were present in each plant (pyramided), and 4) modification of each of the above deployment strategies by addition of totally susceptible wheat to the system. Effects of temporal and spatial characteristics of the mixtures were also explored. Interpolating a pyramided resistant cultivar with some totally susceptible plants offers the highest relative durability in most cases, and is predicted to last >400 fly generations under some conditions.
Rapid, Quantitative Colorimetric Detection of a Lectin Using Mannose-Stabilized Gold Nanoparticles (2003)

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTRapid, Quantitative Colorimetric Detection of a Lectin Using Mannose-Stabilized Gold NanoparticlesDuncan C. Hone, Alan H. Haines, and David A. RussellView Author Information School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich, Norfolk NR4 7TJ, United Kingdom Cite this: Langmuir 2003, 19, 17, 7141–7144Publication Date (Web):July 3, 2003Publication History Received28 February 2003Published online3 July 2003Published inissue 1 August 2003https://pubs.acs.org/doi/10.1021/la034358vhttps://doi.org/10.1021/la034358vbrief-reportACS PublicationsCopyright © 2003 American Chemical SocietyRequest reuse permissionsArticle Views2612Altmetric-Citations168LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Absorption,Aggregation,Carbohydrates,Metal nanoparticles,Nanoparticles Get e-Alerts
A Mechanism for Securing IoT-enabled Applications at the Fog Layer (2019)

The Internet of Things (IoT) is an emerging paradigm branded by heterogeneous technologies composed of smart ubiquitous objects that are seamlessly connected to the Internet. These objects are deployed as Low power and Lossy Networks (LLN) to provide innovative services in various application domains such as smart cities, smart health, and smart communities. The LLN is a form of a network where the interconnected devices are highly resource-constrained (i.e., power, memory, and processing) and characterized by high loss rates, low data rates, and instability in the communication links. Additionally, IoT devices produce a massive amount of confidential and security-sensitive data. Various cryptographic-based techniques exist that can effectively cope with security attacks but are not suitable for IoT as they incur high consumption of resources (i.e., memory, storage and processing). One way to address this problem is by offloading the additional security-related operations to a more resourceful entity such as a fog-based node. Generally, fog computing enables security and analysis of latency-sensitive data directly at the network’s edge. This paper proposes a novel Fog Security Service (FSS) to provide end-to-end security at the fog layer for IoT devices using two well-established cryptographic schemes, identity-based encryption, and identity-based signature. The FSS provides security services such as authentication, confidentiality, and non-repudiation. The proposed architecture would be implemented and evaluated in an OPNET simulator using a single network topology with different traffic loads. The FSS performed better when compared with the APaaS and the legacy method.
[The value of a Tenckhoff catheter in ovarian cancer]. (1991)

It is generally difficult to treat patients with ovarian cancer. A Tenckhoff catheter was implanted in eighteen patients for intraperitoneal chemotherapy and drainage of ascites. Sixteen cases including 5 recurrent cases were treated with anticancer drug. It could not be used in two cases by bowel adhesion, so immediately catheters were removed. CDDP (100-150 mg/body) with or without Etoposide (180-300 mg/body) in 2 liters of saline was administered via Tenckhoff catheter over 30 minutes with a dwell time of 4 hours. We have studied the kinetics of CDDP and Etoposide in ascites and blood after intraperitoneal chemotherapy. High concentrations of free-CDDP and Etoposide were reached for 4 hours in the ascites but concentrations in the blood varied. These results showed obviously high values and direct effects on the tumor cells in the abdominal cavity and the peritoneal clearance depended on the severity of carcinomatous peritonitis in each case. Twelve cases showed decrease, but 4 cases increase of ascites. Five recurrent cases and one patient of stage IV died. Seven cases are outpatients and the disease free duration of their ranges are from 1 to 24 months. Three patients are now under treatment. Intraperitoneal chemotherapy elicited only mild nausea, myelosuppression and no significant changes of renal function. No patients had signs of catheter infection and peritonitis. These findings suggested that a Tenckhoff catheter was valuable to treat and manage ovarian cancer patients with little side effect.
Evaluation of the Effect of Acute and Subacute Exposure to TiO2 Nanoparticles on Oxidative Stress (2013)

The nanosized titanium dioxide (nano-TiO2) is produced abundantly and used widely in the chemical, electrical/electronic, and energy industries because of its special photovoltaic and photocatalytic activities. Past reports have shown that the nano-TiO2 can enter into the human body through different routes such as inhalation, ingestion, dermal penetration, and injection. The effects of nano-TiO2 on different organs are currently being investigated. Oxidative stress is considered to play an important role in the oxidative potential of nanoparticles. Here we discuss the association between oxidative stress and the toxicity caused by exposure to nano-TiO2 in different organs.
Evaluating InfiniBand performance with PCI Express (2005)

The InfiniBand architecture is an industry standard that offers low latency and high bandwidth as well as advanced features such as remote direct memory access (RDMA), atomic operations, multicast, and quality of service. InfiniBand products can achieve a latency of several microseconds for small messages and a bandwidth of 700 to 900 Mbytes/s. As a result, it is becoming increasingly popular as a high-speed interconnect technology for building high-performance clusters. The Peripheral Component Interconnect (PCI) has been the standard local-I/O-bus technology for the last 10 years. However, more applications require lower latency and higher bandwidth than what a PCI bus can provide. As an extension, PCI-X offers higher peak performance and efficiency. InfiniBand host channel adapters (HCAs) with PCI Express achieve 20 to 30 percent lower latency for small messages compared with HCAs using 64-bit, 133-MHz PCI-X interfaces. PCI Express also improves performance at the MPI level, achieving a latency of 4.1μs for small messages. It can also improve MPI collective communication and bandwidth-bound MPI application performance.
Apoptosis in human hepatocellular carcinoma and in liver cell dysplasia is correlated with p53 protein immunoreactivity. (1997)

Apoptosis is detectable in HCC, and is not related to type and grade. There is a highly significant positive correlation between the apoptotic rate in HCC and both the proliferative activity and p53 protein expression. A similar phenomenon occurs for putative cancer precursors. The findings support the role of p53 in regulating apoptosis in preneoplastic and neoplastic liver lesions.
[SYTO/EB dyes for detection of skin viability]. (2002)

The assessment of skin viability by SYTO/EB is also quick, sensitive and convenient. At the same time the viability of any type of cells can be observed in situ. So it can be considered as an available method for detection of skin viability.
Images and Perceptions as Barriers to the Use of Library Staff andServices (1994)

Discusses the images and perceptions that individuals and library funders hold of libraries, library services and the librarian profession in relation to effective use of libraries and the skills of librarians. Argues that contributing factors to non‐use and under‐use are also those images and perceptions which librarians themselves hold of their profession and of potential users and their information needs. It is not only negative images and perceptions that need to be overcome but also barriers caused by lack of awareness of the “library world” and unrealistic expectations. Draws on surveys and experiences across all types of libraries from school to university and public to private sector.
The role of the immunoproteasome in interferon-γ-mediated microglial activation (2017)

Microglia regulate the brain microenvironment by sensing damage and neutralizing potentially harmful insults. Disruption of central nervous system (CNS) homeostasis results in transition of microglia to a reactive state characterized by morphological changes and production of cytokines to prevent further damage to CNS tissue. Immunoproteasome levels are elevated in activated microglia in models of stroke, infection and traumatic brain injury, though the exact role of the immunoproteasome in neuropathology remains poorly defined. Using gene expression analysis and native gel electrophoresis we characterize the expression and assembly of the immunoproteasome in microglia following interferon-gamma exposure. Transcriptome analysis suggests that the immunoproteasome regulates multiple features of microglial activation including nitric oxide production and phagocytosis. We show that inhibiting the immunoproteasome attenuates expression of pro-inflammatory cytokines and suppresses interferon-gamma-dependent priming of microglia. These results imply that targeting immunoproteasome function following CNS injury may attenuate select microglial activity to improve the pathophysiology of neurodegenerative conditions or the progress of inflammation-mediated secondary injury following neurotrauma.
Media Transfer with Dynamic Bandwidth Adjustment in IoT-based Home Networks (2018)

Many home-network devices now possess data computing, networking, and media processing functions in smart home space. The increasing and volatile data workload passing through a home gateway from and into home networks or the Internet may cause some issues about data throughput, traffic congestion, quality of service, etc. This situation leads to an interesting study on network resource allocation and management in home environments. This paper proposes a network bandwidth allocation and control mechanism that can be applied at the front edge of the Internet of Things. This mechanism can continuously monitor data throughput between cloud servers, gateways and multiple home-networked devices, and dynamically adjust media content on different network connections. Thus, this mechanism can maintain network and media transfer services in home networks. Our study also develops a simplified prototype to verify the proposed mechanism. Experimental results show expected effects on reducing transmission delay time as keeping the media transfer services in a satisfactory level of quality of service.
Experimental chimaerism in sheep (1984)

Composite sheep embryos (N = 110) were produced by aggregation of blastomeres from 2-, 4- or 8-cell embryos. Each composite embryo consisted of equal numbers of blastomeres from 2-8 parent embryos, the total cell number ranging from one quarter of the normal cell number to 8 times the normal cell number. The embryos were embedded in agar and transferred to ligated sheep oviducts to allow development up to the early blastocyst stage. Of the 101 embryos subsequently recovered, 77 had formed normally organized blastocysts and 74 of these were transferred to 51 recipients. Thirty-eight recipients went to full term, producing a total of 53 lambs. Of the 48 lambs which survived to be blood typed at 60 days of age, 36 were judged to be chimaeric on the basis of their blood type and/or on the basis of external features. The proportion of chimaeras was larger amongst the lambs produced from composite embryos of the normal number of cells or more (25/26) than amongst lambs produced from composite embryos of less than the normal cell number (11/22).
Posiphen as a candidate drug to lower CSF amyloid precursor protein, amyloid-β peptide and τ levels: target engagement, tolerability and pharmacokinetics in humans (2012)

These results confirm preclinical POM studies, demonstrate that pharmacologically relevant drug/metabolite levels reach brain and support the continued clinical optimisation and evaluation of Posiphen for MCI and Alzheimer's disease.
VLSI Design of H.263 Video Codec Based on Modular Architecture (2002)

In this paper, we present an efficient hardware architecture for the H.263 video codec and its VLSI implementation. This architecture is based on the unified interface by which internal hardware engines and an internal RISC processor are connected one another. The unified interface enables the modular design of internal blocks, efficient hardware/software partitioning, and pipelined paralled operations. The developed VLSI supports the H.263 version 2 profile 3 @ level 10, and moreover, both the control protocol H.245 and the multiplexing protocol H.223. Therefore, it can be used for the complete ITU-T H.324 or 3GPP 3G 324M multimedia processor with the help of an external audio codec. Simultaneous encoding and decoding of QCIF format images at a rate greater than 15 frames per second is achieved at 40 MHz clock frequency.
Lysophosphatidic Acid Activates NF-κB in Fibroblasts (1999)

Lysophosphatidic acid (LPA) is a growth factor that exerts a number of well characterized biological actions on fibroblasts and other cells. In the present study, we investigated the possibility that LPA activates the transcription factor NF-kappaB. NF-kappaB is a target of cytokines, but its activation by other classes of agonists has raised considerable interest in the control of processes such as inflammation and wound healing through varied mechanisms. We find that LPA causes a marked activation of NF-kappaB in Swiss 3T3 fibroblasts as determined by the degradation of IkappaB-alpha in the cytosol and the emergence of kappaB binding activity in nuclear extracts. The EC50 for activation of NF-kappaB is 1-5 microM, a range similar to that reported for reinitiation of DNA synthesis and activation of the serum response element. Activation of NF-kappaB is attenuated by pertussis toxin and inhibitors of protein kinase C, and it is completely blocked by the Ca2+ chelator BAPTA-AM. The combination of phorbol ester and thapsigargin promotes an activation comparable with that of LPA. Activation by LPA is additionally inhibited by tyrphostin A25 but not genistein or AG1478, indicating a selective utilization of protein-tyrosine kinases, and by certain antioxidants, implying a role for reactive oxygen species. The activation is also inhibited by tricyclodecan-9-yl-xanthogenate (D609), implying a requirement for hydrolysis of phosphatidylcholine. The data demonstrate the utilization of multiple pathways in the activation of NF-kappaB by LPA, not inconsistent with the relevance of several families of GTP-binding regulatory proteins.
Differential Longevity in Mouse Stocks Selected for Early Life Growth Trajectory (2000)

Small body size is associated with superior longevity in several intraspecies comparisons, including dogs bred for specific forms of work, mice and rats fed diets low in calories, rats fed diets low in methionine, and mutant mice whose levels of growth hormone and thyroid hormone are atypically low. To further investigate the interactions among body size, genetic endowment, and longevity, we measured the life span of female mice selectively bred from Institute for Cancer Research stock for differences in rate of body weight gain. These mice were selected for differential rates of growth either early (0-10 days) or later (26-56 days) in the first 2 months of life. The data show a good correlation between the average weight of the stock and its mean longevity, with low body size associated, as predicted, with longer life span. Weight at 3, 6, and 12 months, and weight at peak body weight, are all significant predictors of longevity (among stocks) in univariate regressions; weight at 6 months has the strongest association in stepwise multiple regression. There is no significant correlation between the life span for the stock and the proportion of deaths attributable to neoplasia in this group of mice. The data provide support for the hypothesis that genetic factors that influence early life growth trajectories can have a strong influence on life span. These size-selected mice provide useful tools for analysis of the genetic factors that influence life history parameters, including maturation and aging rates.
Conhecer para Ocupar. Ocupar para Dominar. Ocupação Científica do Ultramar e Estado Novo. (2013)

Com a Conferência de Berlim (1885) altera-se o paradigma de posse dos espaços coloniais. Osdireitos históricos cedem lugar aos títulos de Ocupação Efectiva desses territórios. Após aocupação militar e administrativa impunha-se a ocupação científica. Impunha-se conhecermelhor para melhor dominar os territórios e desse modo demonstrar às restantes potênciascoloniais europeias, que os territórios africanos distribuídos estavam a ser efectivamenteocupados. A Ocupação Científica dos espaços coloniais emerge como forma de ocupaçãoefectiva dos espaços ultramarinos e, em simultâneo, como de afirmação no plano internacionaldessa mesma ocupação. Diversas áreas científicas concorrem como instrumentos e argumentosessenciais da Missão do Estado colonial ao longo do III Império português, emergindo para tal,diversas instituições com o propósito de estudar para conhecer para melhor ocupar, explorar edominar os espaços além-mar.
Temperature-Responsive Clay Aerogel−Polymer Composites (2005)

Polymer composites reinforced by hydrophilic clay aerogels were produced and found to possess interpenetrating cocontinuous structures, not the exfoliated structure often observed in clay nanocomposites. An efficient process for producing these clay aerogels was recently reported; in-situ polymerization of N-isopropylacrylamide within the clay aerogels was readily accomplished. The resulting composites have low densities, are stable, and exhibit a new synergistic effect of interpenetrating organic−inorganic phases in which the organic polymer prevents loss of aerogel structure in water by encapsulation, while the inorganic filler increases the structural integrity of the polymer. The composites undergo phase transition and show LCST behavior similar to unmodified poly(N-isopropylacrylamide) despite the presence of reinforcing clay aerogels. Reversible changes in morphology of the aerogel hydrogel composites are observed with varying degrees of hydration.
AUTOMATED ITEM SELECTION USING ITEM RESPONSE THEORY* (1991)

ABSTRACT This paper presents a new heuristic approach to interactive test assembly that is called the successive item replacement algorithm. This approach builds on the work of van der Linden (1987a) and van der Linden and Boekkooi‐Timminga (1989) in which methods of mathematical optimization are combined with Item Response Theory (IRT) to construct tests from larger collections or pools of items. This new approach is contrasted with two more formal models as well as other heuristic approaches that appear in the literature. An experiment using quasi‐realistic data is performed that serves to illustrate the differences in approaches for typical practical test construction applications.
Spectroscopic measurements on xenon plasma in a hollow cathode (2000)

Optical emission from xenon plasma in a hollow cathode has been recorded over a wide range of wavelengths extending from vacuum ultraviolet to the visible band 100-590 nm. The cathode was operated in direct current discharge mode with a continuous flow of xenon ~13 cc min -1 at 70 Torr. A column of neutral xenon gas (~21.2 cm long) existed in-between the active plasma column (~1 cm long) source and the detector. The observed spectra show that strong Xe II and impurity (Ba, Al and Ca) lines are superimposed on a weak continuum. Xenon I lines have not been observed. A subsidiary broadened continuum band within the far vacuum ultraviolet range 100-200 nm supports the evidence that the emission due to the transitions by the excited molecular dimer/excimer species is also involved. In the present work, bremsstrahlung emission has been used to estimate the plasma electron temperature Te = 1.1 eV. The resulting electron density ne = 1014 cm-3 is then obtained using the Saha formulation for the ratio of the discrete lines. The radiative properties and the validity of the various plasma equilibrium models within the hollow cathode have also been discussed.