scholarly journals Two suggestions of how to define a multistate coherent system

1982 ◽  
Vol 14 (2) ◽  
pp. 434-455 ◽  
Author(s):  
B. Natvig

One inherent weakness of traditional reliability theory is that the system and the components are always described just as functioning or failed. However, recent papers by Barlow and Wu (1978) and El-Neweihi et al. (1978) have made significant contributions to start building up a theory for a multistate system of multistate components. Here the states represent successive levels of performance ranging from a perfect functioning level down to a complete failure level. In the present paper we will give two suggestions of how to define a multistate coherent system. The first one is more general than the one introduced in the latter paper, the results of which are, however, extendable. (This is also true for a somewhat more general model than ours, treated in independent work by Griffith (1980).) Furthermore, some new definitions and results are given (which trivially extend to the latter model). Our second model is similarly more general than the one introduced in Barlow and Wu (1978), the results of which are again extendable. In fact we believe that most of the theory for the traditional binary coherent system can be extended to our second suggestion of a multistate coherent system.

1982 ◽  
Vol 14 (02) ◽  
pp. 434-455 ◽  
Author(s):  
B. Natvig

One inherent weakness of traditional reliability theory is that the system and the components are always described just as functioning or failed. However, recent papers by Barlow and Wu (1978) and El-Neweihi et al. (1978) have made significant contributions to start building up a theory for a multistate system of multistate components. Here the states represent successive levels of performance ranging from a perfect functioning level down to a complete failure level. In the present paper we will give two suggestions of how to define a multistate coherent system. The first one is more general than the one introduced in the latter paper, the results of which are, however, extendable. (This is also true for a somewhat more general model than ours, treated in independent work by Griffith (1980).) Furthermore, some new definitions and results are given (which trivially extend to the latter model). Our second model is similarly more general than the one introduced in Barlow and Wu (1978), the results of which are again extendable. In fact we believe that most of the theory for the traditional binary coherent system can be extended to our second suggestion of a multistate coherent system.


Author(s):  
Olena Osadcha

The article deals with the development of the model of students’ independent work under conditions of distance learning. The importance of the research into this problem is determined, on the one hand, by the growing possibilities of using various information technologies and, on the other hand by the necessity to adapt to the conditions of today’s world where independent work of students is becoming increasingly important. The advantages and disadvantages of distance learning have been explored. The author studied the role of independent work in the formation of the professional competences of students. The issue of modeling in the area of education has been tackled. The approaches to the development of the model of independent work have been identified and analyzed. The components of the model, such as the goal, the tasks, the content, the methods, the means and evaluation of results have been determined and characterized. The prospects of further development of this research are related to the exploration of models of independent work of students majoring in different areas.


2001 ◽  
Vol 153 (6) ◽  
pp. 1209-1226 ◽  
Author(s):  
Karen Oegema ◽  
Arshad Desai ◽  
Sonja Rybina ◽  
Matthew Kirkham ◽  
Anthony A. Hyman

In all eukaryotes, segregation of mitotic chromosomes requires their interaction with spindle microtubules. To dissect this interaction, we use live and fixed assays in the one-cell stage Caenorhabditis elegans embryo. We compare the consequences of depleting homologues of the centromeric histone CENP-A, the kinetochore structural component CENP-C, and the chromosomal passenger protein INCENP. Depletion of either CeCENP-A or CeCENP-C results in an identical “kinetochore null” phenotype, characterized by complete failure of mitotic chromosome segregation as well as failure to recruit other kinetochore components and to assemble a mechanically stable spindle. The similarity of their depletion phenotypes, combined with a requirement for CeCENP-A to localize CeCENP-C but not vice versa, suggest that a key step in kinetochore assembly is the recruitment of CENP-C by CENP-A–containing chromatin. Parallel analysis of CeINCENP-depleted embryos revealed mitotic chromosome segregation defects different from those observed in the absence of CeCENP-A/C. Defects are observed before and during anaphase, but the chromatin separates into two equivalently sized masses. Mechanically stable spindles assemble that show defects later in anaphase and telophase. Furthermore, kinetochore assembly and the recruitment of CeINCENP to chromosomes are independent. These results suggest distinct roles for the kinetochore and the chromosomal passengers in mitotic chromosome segregation.


Mnemosyne ◽  
2014 ◽  
Vol 67 (2) ◽  
pp. 181-213 ◽  
Author(s):  
Rutger J. Allan

AbstractIn Ancient Greek, topics can be expressed as intra-clausal constituents but they can also precede or follow the main clause as extra-clausal constituents. Together, these various topic expressions constitute a coherent system of complementary pragmatic functions. For a comprehensive account of topic organization, therefore, a limited focus on the clause proper is insufficient. In this paper, I will argue that it is possible to distinguish five different structural positions in which topic constituents may appear in Ancient Greek. These are: (i)Theme, (ii)clause-initial, (iii)postverbal in Setting, (iv)postverbal in main clauseand (v)Tail.Each of these positions in the sentence is associated with a specific pragmatic function: Resumed Topic, Contrastive/New Topic, Given Topic or clarification of Given Topic. In linguistic theory, topic and focus are often seen as independent aspects of information structure instead of complementary functions. It is, therefore, attractive to posit two separate sets of constructional templates: on the one hand, a topic set comprising the aforementioned topic constructions and, on the other hand, a focus set containing two (narrow and broad) focus-constructions. This results in a flexible system in which the word order of each sentence is determined by a combination of a focus construction plus one or more topic constructions.


Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jinlei Qin ◽  
Zheng Li

The performance level of a multistate system (MSS) can vary among different values rather than only two states (perfect functioning and complete failure). To improve the reliability of MSSs, a maintenance strategy has been adopted to satisfy customer demand, and reliability modeling of MSS with preventive maintenance and customer demand is proposed. According to the regular degradation and random failure at each state, based on the Markov random process, the proposed MSS with preventive maintenance can be modeled to satisfy the customer demand in a specific state. This model can also be adapted to compute other reliability indices. Based on this model, the effect of different preventive maintenance actions on the reliability indices can be analyzed and further compared. Two numerical examples have been illustrated to show the validity of the proposed model. The reliability model presented in this study can be used to assess the type of MSS and help reliability engineers to compare different maintenance actions quantitatively and make optimal decisions.


1953 ◽  
Vol 49 (1) ◽  
pp. 130-135 ◽  
Author(s):  
D. ter Haar

ABSTRACTThe liquid drop model of an imperfect gas in the form introduced by Wergeland is discussed by using the method of the grand ensembles and the equation of state of the system is derived. This equation of state is of the same general type as the one derived by Mayer for a more general model. It is shown that in both cases the isotherms consist of two analytically different parts in the limit where the number of particles in the system, N, goes to infinity.


Author(s):  
W.Erwin Diewert

SummaryThe paper develops an extension of a one period model of production involving beginning and end of the period capital stocks along with output and input flows that is due to Hicks and Edwards and Bell. This generalized Austrian model of production takes into account that end of the period capital stocks result from: (i) purchases of new investment goods; (ii) internal construction of firm capital stock components and (iii) holdings of (depreciated) capital goods that were held by the firm at the beginning of the period. These different methods of creating end of period holdings of capital stocks generally have different resource requirements and hence the one period production possibilities set is more complex than the usual one. This general model of production is used to justify the decomposition of the Jorgensonian user cost of capital into separate waiting services and depreciation components.


Author(s):  
JOAQUIN ABELLÁN ◽  
SERAFIN MORAL

The upper entropy of a credal set is the maximum of the entropies of the probabilities belonging to it. Although there are algorithms for computing the upper entropy for the particular cases of credal sets associated to belief functions and probability intervals, there is none for a more general model. In this paper, we shall present an algorithm to obtain the upper entropy for order-2 capacities. Our algorithm is an extension of the one presented for belief functions, and proofs of correctness are provided. By using a counterexample, we shall also prove that this algorithm is not valid for general lower probabilities as it computes a value which is strictly greater than the maximum of entropy.


Author(s):  
Vira Malkina ◽  
Olha Zinovieva ◽  
Andrii Mozghovenko

The modern educational process is becoming increasingly innovative. The most important means of educational activity are computer technology learning. The development and introduction of them into the educational process is a qualitative characteristic of the computerization of education and lay the foundations for its further informatization. The article deals with the structure and content of the initial computer simulation software or the study of the "Transport task" topic, which is intended for the development of knowledge, skills and abilities of students of computer specialties in the process of studying the "Investigation of operations" discipline. The training simulation software provides multiple passage of the material at each separate stage until the correct solution is obtained. To organize the interactive learning process, the "Drag-and-drop" method is used, which, on the one hand, allows us to use more observatory visual diagrams of the problem solving algorithm, and on the other hand, concentrates the attention of students on the main stages of the algorithm and not on the implementation of bulky mathematical calculations. The simulator is designed as a local Windows application that does not require special computer resources and can be easily installed on a personal computer in an auditorium or at home. The simulator can function in two modes – practice and supervision. The simulator can be used during classes and in the process of independent work. The training simulator differs from other types of training devices by the obligatory availability of a script for verifying the actions that the student must perform in order to accomplish the task. In the process of executing actions and commands in the simulator, the verification of expected actions in the script is performed, after the result is displayed to the user. After that, in case of wrong actions, the user is given the opportunity to correct the errors. Only after correcting them, the user can go to the next stage of solving the problem. The user receives feedback and can find out about their mistakes and ability to correct them.


2021 ◽  
pp. 130-137
Author(s):  
Любовь Андреевна Никитина

Анализируются результаты анкетирования преподавателей и студентов по выявлению типичных затруднений и причин их появления в контексте написания выпускной квалификационной работы, которые обусловлены, с одной стороны, отсутствием опыта обращения к письменной речи в процессе изучения дисциплин профессиональной подготовки, с другой – неготовностью обучающихся осуществлять рефлексию процесса речевой деятельности и ее продуктов, а также невладением способами организации самостоятельной работы. Выявлены типичные ошибки в создании текста выпускной работы: отсутствие коммуникативной задачи; несоблюдение логики и взаимосвязи частей текста; включение непереработанных материалов из первоисточников; отсутствие собственного суждения по изучаемой теме. Установлено, что основной причиной их появления выступает невладение текстовыми умениями в построении научного текста. Обозначены направления в обучении письменной научной речи в процессе подготовки в вузе: включение заданий во все дисциплины подготовки, программы педагогических практик, предполагающих написание текста научного стиля, использование образовательных технологий, ориентирующих на использование письменного текста как результата обучения. Делается вывод о том, что обучение написанию текста выпускной квалификационной работы предполагает последовательное вовлечение обучающихся в овладение культурой письменной научной речи, а также опыт исследовательской деятельности преподавателя. According to the standards of higher education, a graduate of a pedagogical university is obliged to conduct a pedagogical study and draw it up in the text of the final qualification work. However, analysis of the works shows that for many future teachers, writing a scientific text causes significant difficulty. The questionnaire revealed typical difficulties and reasons for their occurrence, which are due, on the one hand, to the lack of experience in writing in the process of studying vocational training disciplines. On the other hand, it is not the willingness of students to reflect on the process of speech activity and its products, and also not to own ways of organizing independent work. Typical mistakes in the creation of the text of the graduation work were revealed: the lack of a communicative task, the lack of compliance with the logic and relationship of parts of the text, the inclusion of unprocessed materials from primary sources, the lack of own judgment on the topic being studied. Directions in teaching written scientific speech in the preparation process at the university are indicated: inclusion of tasks in all disciplines of training, programs of pedagogical practices involving writing a text of a scientific style, the use of educational technologies focusing on the use of written text as a result of training. It is concluded that training in the writing of the text of the final qualification work involves the consistent involvement of students in the mastery of the culture of written scientific speech, as well as the experience of the research activity of the teacher.


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