Temat: precision - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Lower Precision calculation for option pricing
Autorzy:: Ścibisz-Mordelska, K.
Nielek, R.
Tematy:: option pricing
lower precision
half-precision type
Monte Carlo
Black-Scholes formula; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/305297.pdf Link otwiera się w nowym oknie
Opis:: The problem of options pricing is one of the most critical issues and fundamental building blocks in mathematical finance. The research includes deployment of lower precision type in two options pricing algorithms: Black-Scholes and Monte Carlo simulation. We make an assumption that the shorter the number used for calculations is (in bits), the more operations we are able to perform in the same time. The results are examined by a comparison to the outputs of single and double precision types. The major goal of the study is to indicate whether the lower precision types can be used in financial mathematics. The findings indicate that Black-Scholes provided more precise outputs than the basic implementation of Monte Carlo simulation. Modification of the Monte Carlo algorithm is also proposed. The research shows the limitations and opportunities of the lower precision type usage. In order to benefit from the application in terms of the time of calculation improved algorithms can be implemented on GPU or FPGA. We conclude that under particular restrictions the lower precision calculation can be used in mathematical finance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Influence of Micropauses on Surgeons’ Precision After Short Laparoscopy Procedures
Autorzy:: Komorowski, Andrzej L.
Usero, David Dominguez
Rodil, Jose Ramon Martin‑Hidalgo
Topór-Mądry, Roman
Tematy:: laparoscopy
surgical technique
surgical precision; Pokaż więcej
Wydawca:: Index Copernicus International
Powiązania:: https://bibliotekanauki.pl/articles/1395574.pdf Link otwiera się w nowym oknie
Opis:: It has recently been shown that micropauses during long surgical procedures can be beneficial for surgeons’ precision and fatigue. The aim of the study was to evaluate the impact of micropauses on surgical precision measured by a simple smartphone application. Material and methods. Two surgeons performed 40 simple laparoscopic procedures (appendectomy and cholecystectomy) with or without micropauses. After the operation the precision of surgical movements was measured by a simple smartphone application in which the number of successful trials and their mean time were used as a precision surrogate. Results. Mean number of successful trials was significantly higher for appendectomy than for cholecystectomy (5.59 vs 4; p = 0.032). There was a difference between participating surgeons both in terms of number of successful trials (5.80 vs 3.55; p = 0.01) and a mean time of all successful trials (10.03 vs 6.28; p = 0.001). No other statistically significant differences were identified. Conclusion. Micropauses had no influence on surgical precision as evaluated after short laparoscopy procedures. The only differences were surgeon-dependent and intervention-dependent.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Limiting Precision Distortions in Spindle Unit of HSC Machining Centre
Autorzy:: Jedrzejewski, J.
Kwasny, W.
Modrzycki, W.
Tematy:: HSC
machine tool
precision
distortion; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/971113.pdf Link otwiera się w nowym oknie
Opis:: The paper presents causes of excessive precision distortions, appearing in electrospindles of HSC machining centres. The influence of changing ambient temperature is shown, as well as the precision of its modelling. Phenomena, which appear in the electrospindle unit during large rotational speed changes, have been presented and the functioning of bearing loading sleeve has been shown, which has the task of compensating thermal expansions of a spindle. Conditions of proper functioning of the sleeve have been presented, which should assure minimal displacements of a spindle. Also, possibilities of increasing bearing life span have been pointed out.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Precise model of HSC Machining Centre for aerospace parts machining
Autorzy:: Jedrzejewski, J.
Kwasny, W.
Kowal, Z.
Modrzycki, W.
Tematy:: machining centre
model
aerospace
precision; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/1429344.pdf Link otwiera się w nowym oknie
Opis:: This article shows the aspects of precise modelling of precise High-speed Machining Centres for High-Speed Cutting (HSC) of parts used in the aerospace industry. The main focus was made on the thermal errors having a dominant influence on the precision of machining. Main assumptions for a hybrid thermal model of a centre thermal behaviour have been stated, taking into account the characteristics of heat sources. On the example of a 3-axis machining centre, measured runs of heating up and heat displacements have been shown, compared to these determined with the use of simulations of a behaviour in assumed working conditions. A special attention was drawn to the phenomena taking place in motorspindles, as well as to the displacements of a spindle face during high rotational speeds of spindles and step changes of rotational speeds. The significance and influence of the bearing preload and centrifugal forces on the spindle axial displacements was shown, which is decisive on the precision of part machining. Additionally, it was shown that the important component of a machining error is an error of spindle position identification by means of a linear encoder, resulting from the thermal deformation of a centre body, to which a quartz linear encoder is fixed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Improving text classification with vectors of reduced precision
Autorzy:: Pietroń, Marcin
Wielgosz, Maciej
Wróbel, Krzysztof
Duda, Jerzy
Smywiński-Pohl, Aleksander
Wydawca:: SciTePress - Science and Technology Publications
Opis:: This paper presents the analysis of the impact of a floating-point number precision reduction on the quality of text classification. The precision reduction of the vectors representing the data (e.g. TF–IDF representation in our case) allows for a decrease of computing time and memory footprint on dedicated hardware platforms. The impact of precision reduction on the classification quality was performed on 5 corpora, using 4 different classifiers. Also, dimensionality reduction was taken into account. Results indicate that the precision reduction improves classification accuracy for most cases (up to 25% of error reduction). In general, the reduction from 64 to 4 bits gives the best scores and ensures that the results will not be worse than with the full floating-point representation.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

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Skocz do pozycji: 6.

Tytuł:: Testing of the relative precision in local network with use of the Trimble Geo XR GNSS receivers
Autorzy:: Štroner, M.
Urban, R.
Královič, J.
Tematy:: high precision network
GNSS method
testing
precision evaluation
wysoka precyzja sieć
metoda GNSS
badania; Pokaż więcej
Wydawca:: Politechnika Warszawska. Wydział Geodezji i Kartografii
Powiązania:: https://bibliotekanauki.pl/articles/225046.pdf Link otwiera się w nowym oknie
Opis:: The paper deal with testing of different GNSS measurement methods in highly accurate network for the objectives engineering surveying. The test is comprised of a set of measurement acquired by particular GNSS methods with different observation length. For purposes of the test, an appropriate network of five points in local system was created and accurately trigonometrically measured. The result of testing is a comparison of individual methods in position using two dimensional congruent transformation and in height using one dimensional congruent transformation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Recent advances in precision, sustainability and safety of machine tools
Autorzy:: Uhlmann, Eckart
Tematy:: machine tool
precision
safety
sustainability; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/24084721.pdf Link otwiera się w nowym oknie
Opis:: Machine tools are the main driver of economic, environmental and social sustainability in industrial production. The ongoing shift from mass production to highly individualized, small batch manufacturing requires machine tools to be more flexible to changing needs while maintaining at least the same level of productivity. However, flexibility and productivity are at odds with the necessity for resource and energy efficiency. At the same time, more sophisticated workpiece specifications are pushing the boundaries regarding precision and dynamics of machine tools. In such a high-performance context, machine safety plays a major role and is becoming increasingly challenging due to higher kinetic energies of moving components. This paper examines recent advances in machine tool precision, sustainability, and safety. Six comprehensive case studies are provided to illustrate how these improvements contribute to an increased productivity. Hardware and software solutions for pose-controlled robotic manufacturing and thermoelectrically tempered high-performance spindles will be presented. Modular machine tool frames based on building blocks and an adaptive cooling system with thermoelectric generators for linear direct drives demonstrate their major impact on resource and energy efficiency. Machine safety is addressed through an analysis of potential hazards as well as improved protective measures. Model-based predictions precisely identify critical process parameters that lead to unbalance-induced failure of slim tool extensions, while on the protection side, new statistical models are applied to assess the protective performance of safeguards much more accurately. The cutting-edge technologies for machine tools presented in this paper will help manufacturers to cope with current and future challenges in industrial production.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Control algorithm of a precision seeder
Autorzy:: Rutkowski, J.
Vicente, N. M. A.
Spadło, M.
Szulc, T.
Tematy:: differential GPS
seeder
precision agriculture; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Powiązania:: https://bibliotekanauki.pl/articles/335414.pdf Link otwiera się w nowym oknie
Opis:: This paper addresses the issue of the control system of a precision seeder. This seeder is to be used to dispose seeds in one field in such way that the plants originated from those seeds resemble the pixels of a digital image, thus acting as a "garden printer". The seeder is developed to be used for seeding public gardens with complex images and shapes, but the knowledge obtained on its development is to be used as well in other fields of precision agriculture. After a brief description of the components of the seeder, the control algorithm will be presented, as well as the mathematical principles behind it. At the end of this document a field test, where the logo of the Industrial Institute of Agricultural Engineering was seeded/"printed" on the snow (in order to be visible), is shown.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 9.

Tytuł:: Measurement System for Assesment of Motor Cylinder Tolerances and Roundness
Autorzy:: Jermak, C. J.
Dereżyński, J.
Rucki, M.
Tematy:: precision
measurement
accuracy
roundness
automation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/220758.pdf Link otwiera się w nowym oknie
Opis:: The paper describes the concept of a novel measurement system designed for quick and inexpensive measurement of tolerances and assessment of roundness, especially suitable for the motor industry. The structure of measurement system and its algorithm of measurement data analysis are described in detail. The system underwent tests with the setting (master) rings of known tolerances and out-of-roundness. The results were compared with those obtained from the reference device PIK-2. The tested system exhibited a very good accuracy and proved to be a good measurement tool. It was implemented in the industrial enterprise.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Measuring means knowledge
Autorzy:: Balle, B.
Tematy:: measuring machine
geometric features
precision
scans; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/132138.pdf Link otwiera się w nowym oknie
Opis:: Optical designers, physicists and engineers at FISBA develop, analyze and optimize optical components on behalf of their customers. Thanks to its innovative production techniques, the Swiss company is widely renowned as a manufacturer of highquality optical components and systems. A ZEISS MICURA coordinate measuring machine is among the tools used by the company to ensure the quality that is valued around the globe.
Dostawca treści:: Biblioteka Nauki

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