gebhart/patrepeval huggingface dataset:
A real world evaluation of Push to Talk service over IMS and LTE for public safety systems (2014)

Push To Talk (PTT) is a half duplex communication system which can be used to perform either one to many group calls. Since 1997, PTT has been deployed over Terrestrial Trunked Radio (TETRA) network for mission critical military and civilian use. The cost of operation and maintaining a Tetra network runs into billions of pounds. Hence governments around the world are looking to share the existing LTE and IMS platforms in order to run PTT service over it. This paper looks at the performance analysis of the PTT over IMS.
Multimegapoint FFT's running on workstation computers (2002)

The authors show that the data addressing required for an in-place fast Fourier transform (FFT) whose memory requirement significantly exceeds the physical memory size of a machine causes an unacceptable level of virtual memory disk access, commonly known as thrashing. In addition, a matrix-decomposition FFT is shown to replace the reordering of the large data set with matrix transpositions, using a two pass memory-efficient matrix transposition technique. The matrix FFT, combined with a file oriented matrix transpose, is shown to be an easy way to prevent thrashing. This method was applied to perform simulations of a 2/sup 23/ (8,388,608) point real-only FFT processor which will be used in NASA's Search for Extraterrestrial Intelligence program.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Wireless Data Transmission in the Andes: Networking (2006)

The city of Merida, in the northern Andes, is home to a 200-year-old university that has shown a strong commitment to networking, as witnessed by the deployment of a 100 Mbps TDM fiber optic data and voice network, with a 155 Mbps ATM (asynchronous transfer mode) overlay and by the organization of three Latin American Networking Schools over the past six years. The desire to extend the benefits of Internet access to the surrounding communities was curtailed by the difficult terrain and limitations of the telephony infrastructure. These challenges were met by means of radio technologies, beginning with packet radio in the VHF (very high frequency) and UHF (ultra high frequency) bands, that was soon made obsolete by the bandwidth requirements of Web access, and venturing into higher speeds made feasible by microwaves, using both spread spectrum and narrowband solutions. The state-of-the-art network currently being deployed allows for 10 Mbps full duplex data transmission and spans a mountainous region some 200 by 100 km, from sea level to 5000 m. Innovative multisectorial antennas make for efficient use of the 6 MHz per channel spectrum, while allowing video conference and IP (Internet protocol) telephony applications. Schools, hospitals, libraries, and community centers are the main target for connectivity, but several government agencies are now able to interact with citizens with unheard-of efficiency, prompting for profound social changes. This paper addresses the technical and cultural hurdles that had to be overcome to bring the project to fruition.
Preparation of Crosslinked Starch Beads as a Medium for Gel Filtration (1989)

Abstract Potato starch is dispersed in sodiumhydroxide and fine emulsion is obtained by stirring in liquid paraffin at 80°C. The emulsion is crosslinked with epichlorohydrin in presence of sodium borohydride to obtain thermostable beads. Beads of uniform size were obtained by sedimentation under gravity. Mixtures of proteins such as bovine serum albumin (BSA) and cytochrome c can be separated on columns (Ø 2.5 × 25.0 cm) packed with these beads. The elution profiles are similar to that of Sephadex G‐100.
Design and integration of new software for the Robot Controller Test Station (2003)

A description is given of the Robot Controller Test Station (RCTS), a software environment for implementing, testing, and evaluating robot control and sensor algorithms in both a simulated and a real robot system. RCTS is designed for flexibility, portability, ease of modification and ease of use. The authors discuss many of the design and implementation issues for RCTS. They outline the steps that a researcher can follow in order to integrate a control, sensing hardware interface or data analysis algorithm into an RCTS-based robot system. These steps do not require the researcher to be an expert programmer or even to comprehend the remainder of the robot software, so he or she can concentrate on algorithm design and optimization.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Real-time implementation of a low delay low bit rate vocoder with a single ADAP-21020 (2002)

This paper presents a low delay vocoder operating at 4.8 kb/s with a modified code excited linear prediction (CELP) algorithm. The total speech coding delay is only 2.5 msec. The coder has also been real-time implemented using a single ADSP-21020 chip and provided a good output speech quality. In this low delay vocoder, backward LPC analysis is used to obtain the short term filter coefficients and a new approach based on a "dual-decision" scheme is adopted to calculate the long term prediction (LTP) coefficients. At the excitation part, a new excited model is exploited which contains a sinusoidal codebook and a stochastic codebook to excite the whole speech system. The synthesized speech of this vocoder has a comparable quality to that of the conventional CELP coder, i.e., the FS-1016, while having a delay constraint more than an order of magnitude smaller than that of the conventional coder.
Space efficient caching of query results in search engines (2008)

Web search engines serve millions of query requests per day. Caching query results is one of the most crucial mechanisms to cope with such a demanding load. In this paper, we propose an efficient storage model to cache document identifiers of query results. Essentially, we first cluster queries that have common result documents. Next, for each cluster, we attempt to store those common document identifiers in a more compact manner. Experimental results reveal that the proposed storage model achieves space reduction of up to 4%. The proposed model is envisioned to improve the cache hit rate and system throughput as it allows storing more query results within a particular cache space, in return to a negligible increase in the cost of preparing the final query result page.
Staged Management of Infected Humeral Nonunion (1997)

Fourteen patients with infected humeral nonunion complicated by sinus discharge were treated with a staged protocol consisting of (1) radical debridement with local antibiotic beads implantation, and (2) external skeletal fixation with autologous bone grafting. In the first stage, a thorough debridement and sequestrectomy were done. Antibiotic beads were used to obliterate the bone defect, and the wound was then directly closed. In the second stage, the bead chains were replaced with autogenous cancellous bone graft. Unilateral Hoffman external skeletal fixators were applied simultaneously. The mean follow-up period was 73.6 months (range, 29 months to 9 years). The length of time to achieve bony union ranged from 3.5 to 8 months (average, 4.3 months). Hoffman pin complication was found in two cases, which were then shifted to plate internal fixation. All the infections were eradicated, and the wounds healed without further skin graft or flap coverage. All the fractures achieved bony union except for one in a patient who died. Most patients acquired satisfactory function of elbow motion after removal of external fixation and physical therapy. The method of two-stage management was effective for infected humeral nonunion. Not only was the infection eradicated and osseous union achieved, but also the limb function and joint motion were preserved.
Tubular structures of silicon (2001)

In this paper we demonstrate, using density-functional tight-binding theory, that certain classes of silicon-based tubular nanostructures are stable and energetically viable. Specifically, we consider silicide and SiH nanotubes. The structures adopted by these nanotubes are very similar to those of previously reported phosphorus nanotubes. As in that case, the Si-based nanotubes have a semiconducting gap, which in contrast to carbon nanotubes is largely independent of the tube diameter and chirality. We further report on the mechanical properties of the Si-based nanotubes and suggest possible routes towards their synthesis.
Comparison of Cell-Surface Human Melanoma-Associated Antigens Identified by Rabbit and Murine Antibodies (1982)

Melanoma-associated antigens (MAAs) recognized by murine monoclonal and rabbit polyclonal antibodies were compared. Two rabbit antimelanoma sera raised in our laboratory recognized five human cell-surface MAAs with approximate MWs of 75, 95, 120, 150, and 240 kd. These antigens were easily detected by SDS-PAGE of specific immunoprecipitates on a melanoma cell (HM31) which failed to reveal antigens reactive with the panel of murine monoclonal antibodies studied. By contrast, these five antigens could not be detected on another melanoma cell (SK-MEL-28), which was reactive with several of the murine monoclonals. These results suggest that the MAAs recognized by rabbit and murine antibodies are different and imply that the antigens which are immunogeneic in man may not necessarily be immunogeneic in mice.
Argentina: la multiplicación de los panes y los peces (2007)

El presente artículo tiene por objeto analizar los obstáculos ?y la forma de superarlos? que enfrentan los organismos que integran el Estado cuando pretenden compartir una de las manifestaciones del conocimiento en la sociedad de la información: los programas de computación
Proceedings of the 7th international symposium on Memory management (2008)

It is with great pleasure that we welcome you to the 2008 International Symposium on Memory Management. This year's symposium continues ISMM's tradition as the top venue for the presentation of research results on memory management, and is the second since ISMM switched to an annual format.

The sixteen papers selected for ISMM'08 cover diverse and interesting aspects of memory management. We used a double blind reviewing process, which worked smoothly and efficiently. In an effort to increase the breadth of the reviewer pool and depth of reviewer expertise, this year we used a review (RC) for the first time. The RC provided expert reviews, but was established ahead of time, rather than on an ad-hoc basis. Unlike the program committee, the RC did not attend the PC meeting, so did not contribute to that aspect of the editorial process. Each paper received 3 PC reviews and 1 RC review. We were very happy with how well this worked. We also used the author response mechanism again this year. The program committee were given 30 minutes at the start of the PC meeting to re-read every author response. As each paper was discussed, the discussion leader commented briefly on the author response. The authors' response directly impacted the outcome for a number of papers.
Code Constructions for Error Control in Byte Organized Memory Systems (1983)

Error correcting codes, such as Hamming codes, have been used successfully to correct errors arising from failures in computer memories. Failure of a chip or card can cause errors which exceed the capabilities of these codes. We construct codes which detect any byte error and correct such errors if they are single random errors. A subclass of the codes developed is shown to have the additional capability of detecting double errors. These codes are intended for use when data are packaged on a byte per chip or a byte per card basis. The codes require fewer check bits than any previously known to the authors except when the byte length or number of bytes is small.
Polymorphism of phenobarbitone. II. The crystal structure of modification III (1974)

The crystal structure of modification III of 5-ethyl-5-phenylbarbituric acid has been determined and refined to a conventional R of 0.066 on 2296 reflexions. Form III is monoclinic, P21/c; a = 9.534, b = 11.855, c = 10.794 A, β = 111.56°; Z = 4. Intensity data were collected on a four-circle diffractometer using Mo Kα radiation. The structure was solved by direct methods, the hydrogen atoms located, and the positions of all atoms except hydrogens were refined independently with anisotropic temperature factors. Molecules in the structure are linked together by pairs of hydrogen bonds into infinite chains lying along 21 axes. The conformation of the ethyl and phenyl groups is largely controlled by packing requirements.
Die Farbfehlerkorrektion von Multipletts (1970)

Abstract Unter Ausnutzen von Analogien zur in einer voraufgegangenen Arbeit entwickelten Theorie der effektiven Dispersionsparameter werden die Grundregeln für die Farbfehlerkorrektion von Multipletts abgeleitet. Es zeigt sich, daβ man, um ein Multiplett aus n Gliedern superachromatisch zu korrigieren, die Gläser so auswählen muβ, als ob man mit ihnen ein Simplett aus n − 1 Linsen korrigieren wollte. Insbesondere kann man mit Gläsern, die im R v 3 eine Ebene parallel zur v-Achse aufspannen, kein Triplett, wohl aber ein Quadruplett vollständig für Farbfehler korrigieren. Hat man Brechkräfte und Abstände der Glieder eines Multipletts vorgegeben, so kann man den chromatischen Schnittweiten- und den Vergröβerungsfehler vollständig beseitigen, indem man für zwei der Glieder keine Einzellinsen, sondern aus mehreren geeigneten Gläsern verkittete Simpletts wählt. Die chromatische Korrektur von Tripletts wird näher untersucht. Es zeigt sich, daβ, wenn die Glieder Einzellinsen sein sollen, für hochwertige Korrektur praktisch nur eine Kombination von Flusspat mit Schwerkron in Frage kommt. Als Beispiel für die superachromatische Korrektion eines gegebenen Systems wird eine Heliarvariante zum Superachromaten ausgebaut.
Reading disability: “normative” or “pathological” (1989)

Reading disability or dyslexia involves an “unexpected” failure to read competently in children of normal intelligence. Whilst this has for many years been regarded as a developmental “disorder” it is debatable whether this view can be defended on the basis of the available evidence. Arguments for the normative versus the pathological view of reading disability encompassing population distribution, reading behaviour, correlates of reading failure and primary etiological factors arc presented in this paper. It is concluded that the normative view is the most heuristic and parsimonious on current evidence and has the potential advantages of demedicalising the problem and reducing the stigma for reading disabled children.
Acrosin activity in human spermatozoa in relation to semen quality and in-vitro fertilization (1993)

Acrosin, a sperm proteinase released during acrosomal exocytosis, facilitates penetration through the oocyte vestments. The purpose of this investigation was to determine if a correlation exists between the acrosin activity of ejaculated human spermatozoa, before motility enrichment techniques, and in-vitro fertilization (IVF) success using selected (glass wool or swim-up) spermatozoa. Since all the oocytes were retrieved from women receiving exogenous hormonal stimulation and a mixed population of mature and immature oocytes were encountered, only cases with > or = 50% mature oocytes were analysed. Under these conditions, the acrosin activity was significantly greater (P < 0.01) in the ejaculates in which spermatozoa ultimately fertilized > or = 70% of the mature oocytes, than in the ejaculates in which spermatozoa ultimately fertilized < 70% of the mature oocytes. Furthermore, a strong correlation (r = 0.962, P = 0.0001) was detected between pre-IVF acrosin activity and subsequent high (> or = 70%) IVF success. Acrosin activity from normozoospermic and oligo-asthenozoospermic men was also compared and was significantly (P < 0.01) higher for the normozoospermic group. These data suggest that measurement of acrosin activity may be a valuable clinical laboratory assay for assessing the sperm fertilizing potential and that low acrosin activity is associated with abnormal semen characteristics.
Key odorants of french fries (1998)

Abstract Twenty‐one compounds, which had been screened in preceding experiments as potent odorants of french fries prepared in palm oil (PO), were quantified by stable isotope dilution assays. Nineteen odorants were dissolved in sun‐flower oil in concentrations equal to those in PO. The flavor profile of the model obtained was close to that of a real sample of PO. A comparison of the complete model with models lacking one or more compounds indicated the following key odorants of PO: 2‐ethyl‐3,5‐dimethylpyrazine, 3‐ethyl‐2,5‐dimethylpyrazine, 2,3‐diethyl‐5‐methylpyrazine, 3‐isobutyl‐2‐methoxypyrazine, ( E,Z )‐ and ( E,E )‐2,4‐decadienal, trans ‐4,5‐epoxy‐( E )‐2‐decenal, 4‐hydroxy‐2,5‐dimethyl‐3(2H)‐furanone, methylpropanal, 2‐ and 3‐methylbutanal, and methanethiol. Replacement of palm oil by coconut fat led to a coconut note in the profile of french fries. γ‐Octalactone was identified as a major contributor to this note.
An optimization approach to trajectory generation for autonomous vehicle following (2017)

We present a novel approach to trajectory generation that enables an autonomous vehicle to accurately follow a lead vehicle tracked by on-board sensors. In contrast to other approaches, we ignore the structure of the environment (e.g., lane markings), focusing purely on following the path driven by the vehicle ahead. Based on the leader's velocity, its distance to the ego vehicle and its recorded path, a continuous-curvature trajectory is generated using Sequential Quadratic Programming. As the optimization process takes the ego vehicle's kinematic and dynamic constraints into account, the resulting trajectory is guaranteed to be feasible and safe. The algorithm was tested extensively during practical experiments with an actual autonomous car. Our tests were conducted in both on- and off-road environments, with speeds ranging from 1 m/s to 15 m/s. Ground truth data shows that the system achieves a high degree of accuracy even in difficult scenarios.
A Broadband Planar N-Way Combiner/Divider (2005)

The experimental and predicted performance of the new broadband planar N-way combiner/divider is presented. The advantage of this combiner/divider over those previously published is that it can be realized in a planar structure. Experimental data on the planar combiner/divider for N=4 and N =7 indicates an average isolation of 20 dB between the N ports from 8 to 12 GHz, and compares favorably with analytic predictions.
Stereoselective anticonvulsant activity of the enantiomers of (+/-)-2-hydroxy-2-phenylbutyramide. (1995)

The enantiomers of the anticonvulsant DL-2-hydroxy-2-phenylbutyramide (1) were prepared by resolving the (-)-quinine and (+)-1-phenylethylamine salts of the acids. The optically active acids were then esterified and reacted with ammonia to give (+)-1 and (-)-1. Optical purity of the amides was greater than 99.9% enantiomeric excess by chiral HPLC. Examination of the infrared spectra of the enantiomers and the racemate of 1 in chloroform solution showed identical spectra, but the spectrum of the racemate in a KBr disc was somewhat different from those of the pure enantiomers. Pharmacologically, 1 and its enantiomers have a similar significant anticonvulsant activity at peak drug effect against pentylenetetrazol seizures, but a variation in time between the enantiomers was found with the anticonvulsant activity. In the rotarod ataxia test (-)-1-possessed the lowest neurotoxicity.
The Use of Prostaglandin F2 Alpha for the Prophylaxis of Cyclophosphamide Induced Cystitis in Rats (1990)

It is well-established that cystitis is a significant cause of morbidity after cyclophosphamide administration in clinical populations. We induced hemorrhagic cystitis in rats using cyclophosphamide and compared controls to those pretreated with prostaglandin F2 alpha. Rats were then evaluated for differences in bladder weights, gross edema, gross bleeding, and histologic changes. The weights of the bladders which had been treated with cyclophosphamide were 94% greater than the controls. The weights of the bladders which were pretreated with prostaglandin F2 alpha before cyclophosphamide were only 19% greater than controls. Significant differences were found between cyclophosphamide controls and prostaglandin F2 alpha pretreated groups for gross weight (p less than .0005), gross edema (p less than .0005), and histology (.0005 less than p less than .005). We conclude that prostaglandin F2 alpha may be helpful in preventing cyclophosphamide induced cystitis.
Nanostructured Li[sub 2]FeSiO[sub 4] Electrode Material Synthesized through Hydrothermal-Assisted Sol-Gel Process (2008)

A carbon-coated Li2 FeSiO4 material with uniform nanoparticles (approximately 40-80 nm in diameter) is synthesized by a synthesis route, i.e., a hydrothermal-assisted sol-gel process. As an electrode material for rechargeable lithium batteries, the Li2 FeSiO4 sample shows high rate capability and excellent capacity retention. The Li2 FeSiO4 electrode delivers a discharge capacity of 160 mAh g-1 at C/16 rate, corresponding to 96% of the theoretical value. A discharge capacity of about 91 and 78 mAh g-1 can be obtained at 5 and 10 C rate, respectively. No capacity loss can be observed up to 50 cycles. © 2008 The Electrochemical Society.
Electrical Impedance Tomography Image Reconstruction Using Iterative Lavrentiev and L-Curve-Based Regularization Algorithm (2010)

Electrical impedance tomography (EIT) is a technique for determining the electrical conductivity and permittivity distribution inside a medium from measurements made on its surface. The impedance distribution reconstruction in EIT is a nonlinear inverse problem that requires the use of a regularization method. The generalized Tikhonov regularization methods are often used in solving inverse problems. However, for EIT image reconstruction, the generalized Tikhonov regularization methods may lose the boundary information due to its smoothing operation. In this paper, we propose an iterative Lavrentiev regularization and L-curve-based algorithm to reconstruct EIT images. The regularization parameter should be carefully chosen, but it is often heuristically selected in the conventional regularization-based reconstruction algorithms. So, an L-curve-based optimization algorithm is used for selecting the Lavrentiev regularization parameter. Numerical analysis and simulation results are performed to illustrate EIT image reconstruction. It is shown that choosing the appropriate regularization parameter plays an important role in reconstructing EIT images.
A Model for the Simulation of Atmospheric Turbulence (1976)

A method that produces realistic simulations of atmospheric turbulence is developed and analyzed. The procedure makes use of a generalized spectral analysis, often called a proper orthogonal decomposition or the Karhunen-Loève expansion. A set of criteria, emphasizing a realistic appearance, a correct spectral shape, and non-Gaussian statistics, is selected in order to evaluate the model turbulence. An actual turbulence record is analyzed in detail providing both a standard for comparison and input statistics for the generalized spectral analysis, which in turn produces a set of orthonormal eigenfunctions and estimates of the distributions of the corresponding expansion coefficients. The simulation method utilizes the eigenfunction expansion procedure to produce preliminary time histories of the three velocity components simultaneously. As a final step, a spectral shaping procedure is then applied. The method is unique in modeling the three velocity components simultaneously, and it is found that important cross-statistical features are reasonably well-behaved. It is concluded that the model provides a practical, operational simulator of atmospheric turbulence.