scholarly journals Parameter Estimation for Dynamic Model of the Financial System

Author(s):  
Veronika Novotná ◽  
Vladěna Štěpánková

Economy can be considered a large, open system which is influenced by fluctuations, both internal and external. Based on non-linear dynamics theory, the dynamic models of a financial system try to provide a new perspective by explaining the complicated behaviour of the system not as a result of external influences or random behaviour, but as a result of the behaviour and trends of the system’s internal structures. The present article analyses a chaotic financial system from the point of view of determining the time delay of the model variables – the interest rate, investment demand, and price index. The theory is briefly explained in the first chapters of the paper and serves as a basis for formulating the relations. This article aims to determine the appropriate length of time delay variables in a dynamic model of the financial system in order to express the real economic situation and respect the effect of the history of factors under consideration. The determination of the delay length is carried out for the time series representing Euro area. The methodology for the determination of the time delay is illustrated by a concrete example.

2012 ◽  
Vol 9 (2) ◽  
pp. 231-239
Author(s):  
Anne E. McLaren

In recent decades, historians of European history have produced many studies on the history of emotions. Based on the hypothesis that emotions are neither a biological essence nor a universal fixed attribute, they have sought to trace constructions of human emotionality as reflected in literary and other works in a particular society over time. This new sub-discipline, the study of what is often termed “sentimental culture”, has illuminated the interaction between the articulation of an emotional sensibility and significant social trends of the age, including the rise of humanitarian discourse, radical Protestantism, and a destabilizing of sexual norms. From the new perspective of the cultural history of emotion, the modern idea that emotions express individual inwardness and autonomy now appears to be contingent and culture bound. In the case of China, while there has been an abundance of studies of the cult of qing 情 (‘passion, desire’) in the late Ming, there are few works dealing specifically with the historical construction of emotion in pre-modern China, particularly from a linguistic point of view.


Author(s):  
Lucia Ovidia Vreja ◽  
Sergiu Bălan

This chapter presents the role of nature and nurture in shaping the behavior of human beings toward sustainability identifying instances of both dramatic extinctions of species and collapse of entire societies, as well as successful, peaceful, and healthy adaptation of human communities to their environment, in an attempt to presents the imperative conditions necessary for attaining sustainable development. A very long and intriguing history reveals that from the nature's point of view humans are rather destructive, interested in their own short-term survival. Nevertheless, the same long history of human species bears valuable lessons and examples of adaptive behaviors grounded by nurture, and based on these examples, the chapter aims at advancing a new perspective of thinking sustainable development that could lay the foundation of a new education curriculum.


Robotica ◽  
2013 ◽  
Vol 32 (4) ◽  
pp. 643-657 ◽  
Author(s):  
Ahmet Dumlu ◽  
Koksal Erenturk

SUMMARYIn this study, kinematic analysis of 6-DOF RSS parallel manipulator using Denavit Hartenbeng (D-H) method is investigated. In addition, in order to improve the proposed method, determination of all the active and passive angles, required to obtain Jacobian and complete dynamic model of manipulator, is also achieved. The effects of dynamic models of 6-DOF RSS parallel manipulator with its actuators on trajectory tracking control are studied in detail. Feedback dynamic compensation terms of motor-mechanism coupling system that is needed to compute torque control are obtained through both a single link approximation model and a complete dynamic model. The complete model is derived by taking account of the interaction between the input links and coupler links of the manipulator. Simulations showed that obtaining complete model of manipulator by means of D-H method and using computed control law could improve the quality of trajectory tracking control of parallel manipulator.


Author(s):  
Andrei Aleksandrovich Ostapenko

This peer review analyzes a monograph “Pedagogical Skill in Russia: history, theory, practice (mid XVIII – XX centuries” by L. A. Milto published in Ukrainian language in Kiev (2008). The goal of peer review lies in familiarization of the Russian language experts in the area of history of education and national pedagogical thought with a new perspective upon the development of pedagogical practice in Russia for the period of two and a half centuries. Modesty of the edition (300 printed copies) and language of publication makes the book virtually unreachable for the Russian audience. The review of the presented monograph is carried out in the context of retrospective analysis of the entire Ukrainian scientific school of pedagogical art. It is underlined that this research represents a worthy development of ideas of the academician I. A. Zazyun. Novelty of the monograph consists in viewing the evolution of Russian education in the aspect of determination of pedagogical findings, approaches of pedagogical art of school teachers and university pedagogues. Of special relevance is the analysis of memoir literature on the lecturing skill of the prominent Russian professors of the XIX century and pedagogical activity of theatrical pedagogues, stage directors and actors of the early XX century. L. A. Milto’s monograph greatly contributes to the history of development of the national pedagogy.


2016 ◽  
Vol 10 (2) ◽  
pp. 252-284
Author(s):  
Mohammad Zahid

The ulama agreed that the inclusion of all sentences in the Qur`an must be based on riwâyat which is mutawâtir, so the truth can be guaranteed (qath`î wurûd âyi al-Qur'ân). It also happened to the word basmalah which always comes in the beginning of the Surah. Therefore, Maliki school refused to state that basmalah as the Qur`an’s sentence, because of the existence of some riwâyat ahâd which informed two different things: it is a part of the Qur`an and it is not.  Actually riwâyat ahâd cannot be used to include a text to be a sentence of the Qur`an or to refuse it. While the majority of ulama’s point of view is not only based on some ahâd histories which stated that basmalah is a sentence of the Qur`an. The history facts in the process of jam`u al-Qur'ân (the gathering of the Qur`an) from the era of the prophet/Rasulullah, the year of Abû Bakr to the standardization of the Qur`an in the year of Utsmân bin `Affân confirmed that the companions of the prophets would never include or refuse a sentence, if it was only based on the ahâd history although its quality was shahîh. Therefore, the determination of the word of basmalah as a statement of the Qur`an, should not be based on the ahâd history only, but also supported with ijmâ` of the companions to the existence of Mushhaf Utsmânî or which is known as the source of history of mutawâtir `amalî.Copyright (c) 2016 by Al-Ihkam. All right reservedDOI: 10.19105/al-ihkam.v10i2.721


Author(s):  
Stefan Höhne ◽  
Alexander Friedrich

Today, it seems that nearly every aspect of life is affected by cryogenic techniques: we cool our food, environments, drugs, organs, eggs, milk, semen, tissue, blood and much more. Our central argument is that these developments lead to the formation of a new form of life, which in many ways is the antipode of what Agamben calls bare life. In analyzing the emergence of cryogenic culture from a biopower point of view, this study offers a new perspective on how populations are fostered and governed through regimes of freshness. While the history of chilled and frozen food slowly gains increasing attention in historical and cultural studies, the historical dynamics of the cryopolitical economy in the network society still need to be explored. Biotechnology, encompassing food production as well as assisted reproductive technology (ART), currently emerges as a most important apparatus (dispositif) of governing populations. It should be understood as a means of ‘biopower’ because it not only contributes to reproducing life but also helps to improve and preserve it. Highly dependent on refrigeration, modern biopower invents a new type of life, which is technologically self-sustained: this is the cryogenic culture. In our paper, we trace the emergence and dissemination of what we call cryogenic life – meaning the ways of producing, distributing, maintaining and dispositioning organic matter via cooling, chilling and freezing. With the introduction of artificial coldness in the late nineteenth century and the expansion of the cold chain, these techniques have become a constitutive element of modern biopower.


Litera ◽  
2021 ◽  
pp. 1-14
Author(s):  
Anna Vladislavovna Lamzina ◽  
Lyubov' Gennad'evna Kikhnei

The subject of this research is the hidden allusions to the novels of Edgar Poe in Anna Akhmatova’s “Poem without a Hero” and poems later period. The research material contains the framework text of the “Poem without a Hero” – the set of epigraphs to different parts of the poem, authorial commentaries, history of used and discarded epigraphs at various stages of revision of the poem, text of the “Poem without a Hero”, as well as the author's “Prose about the Poem” and a number of poems created during the work on the “Poem without a Hero” and afterwards. A. Akhmatova was interested in the works of Edgar Poe, and researched the references to Edgar Poe in the works of N. S. Gumilyov. The article employs comprehensive methodology, such as comparative-historical and biographical approaches, as well as intertextual and hermeneutic methods for determination of literary allusions and interpretation of meanings hidden by the author. The main conclusion lies in revelation of the profoundly concealed connection of the “Poem without a Hero” with the range of narratives of Edgar Poe, united by the cross-cutting motif of being buried alive and coming back from the dead: “The Black Cat”, “The Fall of the House of Usher”, “Morella”, “Ligeia”, “Berenice”, “The Oval Portrait”. This gives a new perspective on the literary characters that one after another appeared to the lyrical heroine in plot of the poem; and explains the fragment of one of the most mysterious works in Russian literature of the XX century, and some other poems of Anna Akhmatova.


The author expresses his regret that notwithstanding the great interest, more especially in a geological point of view, which attaches to every topic connected with the origin, the nature, and the permanence in temperature of the many thermal springs met with in different parts of the world, our information on these subjects is exceedingly deficient. On many points which might easily be verified, and which are of essential consequence towards obtaining a satisfactory theory of the phenomena, we as yet possess but vague and uncertain knowledge. It is evident that the first step towards the establishment of such a theory must consist in the precise determination of the actual temperature of each spring ; from which we may derive the means of estimating by comparative observations, at different periods, the progressive variations, whether secular, monthly, or even diurnal, to which that temperature is subject. We have at present, indeed, not only to lament the total absence of exact data on which to found such an inquiry ; but we are obliged to confess that, owing to the difficulties which meet us even in the threshhold, we have not, even at the present day, made any preparation for establishing the basis of future investigation, by applying such methods of experiment as are really in our power, and are commensurate with the superior accuracy of modern science. The researches of Fourier would lead us to the conclusion that, if the high temperature of these springs be derived solely from that of the interior portions of the earth, the changes which can have occurred in that temperature, during any period to which history extends, must be so minute as to be inappreciable. On the other hand, the theory of internal chemical changes, which have been assigned as the origin of volcanos, would suggest it as improbable that this temperature has remained constantly the same ; and as a more likely occurrence, even were we to suppose that no uniform secular diminution took place, that it would be liable to occasional irregular fluctuations. The influence of earthquakes on the temperature of hot springs is also admitted ; and it would be very desirable to learn, from a series of consecutive observations, whether abrupt changes, similar to those which have occasionally been noticed, are not of frequent occurrence. The author has diligently laboured to collect, by observations made on the spot, materials for supplying this great chasm in the natural history of our globe. As an essential preliminary means of obtaining accurate results, he applied himself to the verification of the scales of the thermometers he employed in these researches : and he describes, in a separate section of this paper, the methods which he adopted for the attainment of this object. He first fixed with great precision the standard points of each thermometer, namely the freezing and boiling temperatures of water, by a mode which he specifies : and afterwards determined the intermediate points of the scale by a method, similar to that of Bessel ; namely, that of causing a detached column of mercury to traverse the tube ; but simpler in practice. Instead of employing for that purpose columns of mercury of arbitrary length, and deducing by a complex and tentative process the portions of the tube having equal capacities, the author detaches a column of mercury from the rest, of such a length as may be nearly an aliquot part of the length of the scale for 180° ; and causes this column to step along the tube ; the lower part of the column being brought successively to the exact points which the upper extremity had previously occupied : so that, at last, if its length has been properly chosen, the upper end of the column is found to coincide with the end of the scale : and this being accomplished, it is easy to apply to every part of the actual scale of the instrument the proper corrections, which may, for greater practical convenience, be drawn up in the form of a table.


Traditio ◽  
1964 ◽  
Vol 20 ◽  
pp. 473-490
Author(s):  
Herbert Musurillo

Since our last report in these pages we have witnessed another successful International Patristic Conference at Oxford in September, 1963; the publication of the papers is earnestly awaited at this writing. Also, since the last bibliographical survey, we have observed two sessions of Vatican Council II, which boasts the largest attendance in the history of ecumenical councils, and perhaps the longest list of schemata or agenda. Here, among the innumerable questions which touched on the aggiornamento of the Church, so dear to the heart of the late Pope John XXIII, who first broached the subject of a council as early as 1959, there have been long discussions about the modernization and adaptation of the liturgy, and the clarification of the relationship between the various sources of Christian belief, that is, the Fathers, Scripture, and tradition, with a special eye to the modern communication of the Church's message. Both of these schemata should be of unparalleled interest to all scholars who concern themselves with the problems of the Christian tradition, and the completion of both of these doctrinal sections is eagerly awaited. Other problems of importance will of course be the relation of the Catholic to the non-Catholic groups, the role of the laity in the Church, the power of the bishops vis-à-vis the Roman Curia, the function of religious orders and congregations, and many more. The present Vatican Council is the twenty-first in a series which began with a small group of bishops who met for a few months in the year 325 under the emperor Constantine at the tiny Asiatic town of Nicaea. Of these twenty councils, however, some non-Catholic groups recognize merely the first four, Nicaea, Constantinople, Ephesus, and Chalcedon; whereas the Separated Eastern churches accept the first seven, that is, down to the second Council which met at Nicaea in 787. Actually, in the present administration of the Church, ecumenical councils are not strictly necessary; but a council, once invoked, becomes a testimony of faith and unity, and from this point of view, the determination of doctrine and discipline is sometimes secondary. Yet it is true to say that from the doctrinal point of view, the two most controversial councils were the two most recent ones, the nineteenth, the Council of Trent (1545-63), and the twentieth, Vatican Council I (1869-70). Without entering into controversy, I think it may be said that these two Councils set patristic scholars of different beliefs farther apart. In any case, the period between Trent and Vatican saw the rise of different schools of patristic scholarship, each attempting to find textual evidence for their own point of view. But, curiously enough, with the rise of the great schools of research in England, France, Germany, Holland and Belgium, the Scandinavian countries, and America, and with the insistence on well-grounded textual studies, the gap between the patristic scholars of different schools of thought has noticeably narrowed. This has been demonstrated not only by the publication of common research projects, but also by the success of such conferences as the International Patristic Conference at Oxford occurring every four years, with the results appearing in Texte und Untersuchungen. It is also shown, I think, in the vast bibliographical project Bibliographia Patristica (Berlin: de Gruyter) under the editorship of W Schneemelcher with the collaboration of an international group of scholars, and now in its fifth volume (publications for 1960-1962). This has been no small achievement. It is therefore all the more profoundly to be hoped that the original pastoral theme enunciated for the Vatican Council by Pope John XXIII in 1959 will remain dominant to the end, promoting a familial atmosphere among all men of good will, and (with special regard for our interests) encouraging a universality among all patristic scholars without prejudice to the quality of their own individual research.


2020 ◽  
Vol 15 (8) ◽  
Author(s):  
Shabnam Tashakori ◽  
Gholamreza Vossoughi ◽  
Hassan Zohoor ◽  
Ehsan Azadi Yazdi

Abstract Drill strings are subjected to complex coupled dynamics. Therefore, accurate dynamic modeling, which can represent the physical behavior of real drill strings, is of great importance for system analysis and control. The most widely used dynamic models for such systems are the lumped element models, which neglect the system distributed feature. In this paper, a dynamic model called neutral-type time delay model is modified to investigate the coupled axial–torsional vibrations in drill strings. This model is derived directly from the distributed parameter model by employing the d'Alembert method. Coupling of axial and torsional vibration modes occurs in the bit–rock interface. For the first time, the neutral-type time delay model is combined with a bit–rock interaction model that regards cutting process in addition to frictional contact. Moreover, mistakes made in some of the related previous studies are corrected. The resulting equations of motion are in terms of neutral-type delay differential equations with two constant delays, related to the oscillatory behavior of the system, and a state-dependent delay, induced by the bit–rock interaction. Illustrative simulation results are presented for a representative drill string, which demonstrates intense axial and torsional vibrations that may lead to system failure without a controller.


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