检索结果-南通市图书馆

On a Certain Method of Rejecting Games With Too Much Risk and Not Enough Expected Gain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2018年第6期6卷 487-496页

作者： ewa drabik Warsaw University of Technology WarsawPoland

Many important economic decisions involve an element of *** aversion is a concept in economics,game theory,finance,and psychology related to the behavior of consumers,players,and investors under *** aversion is an important component of a phenomenon that has been widely discussed in recent *** refers to a tendency to feel the pain of a loss more acutely than the pleasure of an equal-sized *** scientists have analyzed the problem of profitability in *** authors presented certain features which characterize“safe”games played *** and Tversky(1991)showed that the ratio of loss aversion to gain attraction should amount to 1:*** aim of this paper is to show an asymptotically efficient strategy which enables the risk-averse player to establish boundary variables of loss and gain at each stage of a repeated game.

关键词： asymptotically efficient adaptive allocation rule one-armed bandit problem risk aversion repeated games

Stock Indices and New Technologies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2021年第2期9卷 76-86页

作者： ewa drabik Warsaw University of Technology WarsawPoland

Stock indices were created to accurately reflect changes in the prices of stock exchange securities included in *** are divided into price-weighted and value-weighted *** price-weighted indices,each security has the same impact on the index,which is the arithmetic mean of the stock values of the companies it comprises.A value-weighted index accounts for changes in the value of *** choosing the right composition of share packages,one can change the impact of a given security on the *** dynamics also change the composition of the index by removing securities and replacing them with *** impact on the index grows as the price of a given security ***,index values have been strongly influenced by new technology companies,which have greatly appreciated during the SARS-CoV-2 *** aim of this work is to show the changes in two indices in particular:US NASDAQ Composite,and the new competitive SSE STAR index,an index from the Shanghai Stock Exchange.

关键词： stock indices capital markets stock exchange NASDAQ Composite SSE STAR Index

Reverse Engineering, Some Board Games as a Key to the Development of Artificial Intelligence and Construction of Economic Models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2018年第2期6卷 121-132页

作者： ewa drabik Warsaw University of Technology Warsaw Poland

Reverse engineering, also called back engineering, is the process of extracting knowledge or designing information from anything： mechanical device electronic components, computer programs, or biological, chemical matters, and--subsequently--analyzing its components. Reverse engineering can be applied for the sake of creating artificial intelligence, e.g. when the used methods are based on very old games, such as Go and chess. Many generations of computers are able to play at the same level as human grandmasters. A computers＇ arrival at that level is due to imitation of human Go or chess play. A particular emphasis shall be placed upon the Go game, known for 5,500 years. Invented in China, it may be classified as the oldest board game, having its ardent enthusiasts until present times. Old physical issues can be easily projected upon the modeling of new economic phenomena and quantum games. The aim of this paper is to discuss the applications of reverse engineering, traditional social games and other domains, such as quantum physics, to the analysis of utterly new social as well as economic phenomena.

关键词： reverse engineering category theory quantum games social games modelling of economic phenomena

Gold Prices as a Mechanism of Control and Equilibrium in Financial Markets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Management Studies 2020年第2期8卷 134-148页

作者： ewa drabik Warsaw University of Technology WarsawPoland

Gold is used as a currencies comparative measure and,because of its properties(it does not rust)and use(in space industry,for example),it has a significant role in balancing both financial markets and *** crises,gold seldom loses *** aim to show that price of gold is a stabilizing factor for the economic *** will do so utilizing the chaos theory,which gains more and more popularity in social sciences.

关键词： gold price equilibrium fractal market hypothesis(FMH) attractor fractals

On Positional Games With Perfect Information and Their Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2014年第3期2卷 180-187页

作者： ewa drabik Warsaw University of Technology Warsaw Poland

The game theory was firstly used for description of economic phenomena and social interaction. But there are certain type of perfect information games （PI-games）, the so-called positional game or Banach-Mazur games, which so far have not been applied in economy. The perfect information positional game is defined as the game during which at any time the choice is made by one of the players who is acquainted with the previous decision of his opponent. The game is run on a sequential basis. The aim of this paper is to discuss selected Banach-Mazur games and to present some applications of positional game. This paper also shows new theoretical example of a determined PI-game, based by theoretical overview. All considerations are pure theoretical and based by logical deduction.

关键词： Banach-Mazur games a winning strategy determinacy of Pl-game axiom of choice rule of auction finite and infinite games of perfect information the Dutch auction chess

An Analysis of the Connection Between AI Development and the Creation of Games and Advanced Computer Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2018年第4期6卷 251-262页

作者： ewa drabik Warsaw University of Technology WarsawPoland

Electronic games and video games have engaged the interest of artificial intelligence(AI)*** cryptocurrency bitcoin is generated by an algorithm based on cryptography *** frequency trading(HFT)based on high quality *** most spectacular games and programs use a learning neural network,for example backgammon,bridge,*** were created with the use of“deep learning”on multiple layers of neural ***,it is not clear“which path the computer will chose”.The paper aims at discussing the electronic version of some games and their applications in developing an AI.

关键词： AI Go chess video games cryptocurrency neural network

Some Remarks About Financial Market Modelling Using a Minority Game Approach

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Economics World 2016年第5期4卷 216-223页

作者： ewa drabik Piotr Mtodzianowski Warsaw University of Technology Warsaw Poland

The methods adopted by static physics corroborating the existence of electromagnetic forces are applicable to the theory of financial markets. Perceived from a classically physical angle, the financial market is defined as a system composed of several individual entries cooperating upon electromagnetic principles. The approach concerned gives rise to a certain model of financial market, otherwise known as a minority game. In the case of minority game, the allocation of securities and funds is conditioned exclusively upon the fluctuation of prices, where a higher tendency to purchase goods and stocks results in the scale being more profitable and vice versa. Thus players from a minority group gain a prevailing position.

关键词： modelling of financial markets minority game El Farol bar problem

Alternative prediction methods of protein and energy evaluation of pig feeds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2017年第4期8卷 799-812页

作者： ewa Swiech The Kielanowski Institute of Animal Physiology and Nutrition Polish Academy of SciencesJablonnaPoland

Precise knowledge of the actual nutritional value of individual feedstuffs and complete diets for pigs is important for efficient livestock production. Methods of assessment of protein and energy values in pig feeds have been briefly described. In vivo determination of protein and energy values of feeds in pigs are time-consuming,expensive and very often require the use of surgically-modified animals. There is a need for more simple, rapid,inexpensive and reproducible methods for routine feed evaluation. Protein and energy values of pig feeds can be estimated using the following alternative methods: 1) prediction equations based on chemical composition; 2)animal models as rats, cockerels and growing pigs for adult animals; 3) rapid methods, such as the mobile nylon bag technique and in vitro methods. Alternative methods developed for predicting the total tract and ileal digestibility of nutrients including amino acids in feedstuffs and diets for pigs have been reviewed. This article focuses on two in vitro methods that can be used for the routine evaluation of amino acid ileal digestibility and energy value of pig feeds and on factors affecting digestibility determined in vivo in pigs and by alternative methods. Validation of alternative methods has been carried out by comparing the results obtained using these methods with those acquired in vivo in pigs. In conclusion, energy and protein values of pig feeds may be estimated with satisfactory precision in rats and by the two-or three-step in vitro methods providing equations for the calculation of standardized ileal digestibility of amino acids and metabolizable energy content. The use of alternative methods of feed evaluation is an important way for reduction of stressful animal experiments.

关键词： Energy value In vitro Pig Protein value Rat

Natural Organic Amendments for Improved Phytoremediation of Polluted Soils:A Review of Recent Progress

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2016年第1期26卷 1-12页

作者： Alina WISZNIEWSKA ewa HANUS-FAJERSKA ewa MUSZYIISKA Krystyna CIARKOWSKA Institute of Plant Biology and Biotechnology Faculty of Biotechnology and HoricultureUniversity of AgricultureKrakow 31-425(Poland) Department of Soil Science and Soil Protection Faculty of Agriculture and EconomicsUniversity of AgricutureKrakow 31-120(Poland)

Environmental pollution caused by metals, radionuclides and organic pollutants affects quality of the biosphere: soil, water and ***, great efforts have been made to reduce, remove or stabilize contaminants in polluted sites. There has been increasing interest in phytoremediation—the use of plants to reduce concentration of pollutants or to render them harmless. This paper provides a brief review of recent progress in the research and practical application of phytoremediation techniques. Improvements in phytoremediation due to utilization of organic amendments, namely, agro- and industrial wastes(such as sugar beet residue, composted sewage sludge or molasses), biochar, humic substances, plant extracts and exudates are discussed, as well as their influences on soil structure and characteristics, plants growth and bioavailability of pollutants. Both plant-assisted phytoremediation and the use of natural materials in the absence of remediating plant are believed to be cost-effective and environmentally friendly approaches for soil cleanup. However,the characterization and quantification of a range of natural materials used in phytoremediation are essential in order to implement these approaches to practice.

关键词： agricultural wastes bioavailability biochar contamination natural chelators toxic elements