scholarly journals Approaching the Unification and Diversity of Pottery Assemblages

2020 ◽  
Vol 47 ◽  
pp. 522-535
Author(s):  
Aleksandr Diachenko ◽  
Iwona Sobkowiak-Tabaka ◽  
Sergej Ryzhov
Keyword(s):  
Complex Systems ◽  
Dynamic Behaviour ◽  
Subsequent Time ◽  
Time Periods ◽  
Ceramic Assemblages ◽  
Tripolye Culture

This paper questions the cycling nature of the unification and diversity of pottery forms through a case study of ceramics of the Western Tripolye culture in the Southern Bug and Dnieper interfluve in modern Ukraine. We identified the cultural cycle representing the transition from more unified ceramic assemblages to more diverse ones, and then back to more unified assemblages. This cultural cycle is disturbed by the increase in the diversity of pottery sets at three of ten subsequent time periods we have analysed. The obtained results are discussed in frames of deterministic explanations and the dynamic behaviour of complex systems.

Purchasing behaviour and supplier base evolution – a longitudinal case study

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anna Dubois ◽  
Lars-Erik Gadde ◽  
Lars-Gunnar Mattsson
Keyword(s):  
Design Methodology ◽  
Longitudinal Case Study ◽  
Short Term ◽  
Supplier Relationships ◽  
Content Type ◽  
Research Findings ◽  
Purchasing Behaviour ◽  
Time Periods

Purpose The purpose of the paper is to describe and analyse the evolution of the supplier base of a buying firm and the reasons behind these changes. Design/methodology/approach The paper is based on a case study of the changes over 52 years in a sub-set of the supplier base of a firm manufacturing fork-lifts. Findings The study shows that some relationships feature substantial longevity. However, the duration of one-third of the total relationships is shorter than five years. There was considerable variation over time in the dynamics of the supplier base in terms of entries and exits of suppliers. Owing to this variation, research findings and conclusions in short-term studies are heavily dependent on the specific conditions at the time of the study. Finally, no less than one-fourth of the terminated supplier relationships were reactivated later. Research limitations/implications The study was designed in a time when purchasing was considered entirely from the perspective of the buying firm. Further studies, therefore, must increasingly emphasise the role of suppliers and the interaction in the buyer–supplier relationships, as well as the embeddedness in networks. Originality/value The findings of the study are unique in two ways. First, they are based on systematic observations over more than 50 years. Second, the study involves the purchases of 11 components representing different technical and economic features. The (few) previous studies are based on much shorter time periods and involves fewer suppliers/components. Moreover, the findings regarding re-activation of terminated relationships represent unique contributions.

Time in Eusebius’s Ecclesiastical History

2021 ◽  
Vol 5 (4) ◽  
pp. 580-617
Author(s):  
David J. DeVore
Keyword(s):  
Intellectual History ◽  
Late Antiquity ◽  
Historical Narrative ◽  
Late Antique ◽  
New Era ◽  
Ecclesiastical History ◽  
Time Periods ◽  
Sharp Breaks

Eusebius’s Ecclesiastical History, a seminal late-antique historical narrative, features three periodizations of the church’s past. First, a soteriological periodization divides God’s relationship with humanity at Christ’s Incarnation, an event that Eusebius marks in Book 1 with detailed commentary on the gospels rather than narrative. Second, an ecclesiastical periodization divides pristine, heroic apostolic times from post-apostolic times. The divide between apostolic times and the post-apostolic periods is illustrated through a comparison of History 2.13–17, about Simon Magus, Peter, and Mark, and 6.12, on Serapion of Antioch. And third, an epistemological periodization distinguished earlier times from Eusebius’s lifetime, the latter marked by frequent references to “our time.” Eusebius changed numerous narrative features with his changes of period, including alternating between commentary, diachronic, and synchronic format for different time periods; changing protagonists’ fallibility, individuality, composition of texts, and citation of scripture; and providing notices of episcopal successions and quotation of sources. Moreover, Eusebius’s History changed periods not with the sharp breaks of many modern histories but with gradual transitions. He also underscored key continuities, including God’s intervention in human events and alternation between persecuting and protecting rulers—a continuity within which, contrary to scholarly assumptions, the History never inaugurates a new era with the emergence of Constantine. The case study of Eusebius’s periodization suggests an important limitation of the analytic usefulness of periodizations such as “Late Antiquity” for organizing intellectual history.

Reliability-based covariate analysis for complex systems in heterogeneous environment: Case study of mining equipment

2018 ◽  
Vol 233 (4) ◽  
pp. 593-604
Author(s):  
Amin Moniri-Morad ◽  
Mohammad Pourgol-Mohammad ◽  
Hamid Aghababaei ◽  
Javad Sattarvand
Keyword(s):  
Complex Systems ◽  
Cox Regression ◽  
Reliability Evaluation ◽  
Distribution Functions ◽  
Heterogeneous Environment ◽  
Mining Equipment ◽  
Data Set ◽  
Explanatory Variables ◽  
The Impact

Operational heterogeneity and harsh environment lead to major variations in production system performance and safety. Traditional probabilistic model is dealt with time-to-event data analysis, which does not have the capability of quantifying and simulation of these types of complexities. This research proposes an integrated methodology for analyzing the impact of dominant explanatory variables on the complex system reliability. A flexible parametric proportional hazards model is developed by focusing on standard parametric Cox regression model for reliability evaluation in complex systems. To achieve this, natural cubic splines are utilized to create a smooth and flexible baseline hazards function where the standard parametric distribution functions do not fit into the failure data set. A real case study is considered to evaluate the reliability for multi-component mechanical systems such as mining equipment. Different operational and environmental explanatory variables are chosen for the analysis process. Research findings revealed that precise estimation of the baseline hazards function is a major part of the reliability evaluation in heterogeneous environment. It is concluded that an appropriate maintenance strategy potentially mitigate the equipment failure intensity.

scholarly journals Reducing bias in risk indices for COVID-19

2022 ◽  
Vol 17 (s1) ◽  
Author(s):  
Michał Paweł Michalak ◽  
Jack Cordes ◽  
Agnieszka Kulawik ◽  
Sławomir Sitek ◽  
Sławomir Pytel ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Spatial Heterogeneity ◽  
Disease Burden ◽  
Risk Indices ◽  
Study Evaluation ◽  
Dynamical Properties ◽  
Time Periods ◽  
Regional Disease ◽  
Over Time

Spatiotemporal modelling of infectious diseases such as coronavirus disease 2019 (COVID-19) involves using a variety of epidemiological metrics such as regional proportion of cases and/or regional positivity rates. Although observing changes of these indices over time is critical to estimate the regional disease burden, the dynamical properties of these measures, as well as crossrelationships, are usually not systematically given or explained. Here we provide a spatiotemporal framework composed of six commonly used and newly constructed epidemiological metrics and conduct a case study evaluation. We introduce a refined risk estimate that is biased neither by variation in population size nor by the spatial heterogeneity of testing. In particular, the proposed methodology would be useful for unbiased identification of time periods with elevated COVID-19 risk without sensitivity to spatial heterogeneity of neither population nor testing coverage.We offer a case study in Poland that shows improvement over the bias of currently used methods. Our results also provide insights regarding regional prioritisation of testing and the consequences of potential synchronisation of epidemics between regions. The approach should apply to other infectious diseases and other geographical areas.

scholarly journals The interconnection exchange and complex systems properties in power grid network

2021 ◽  
Vol 336 ◽  
pp. 05020
Author(s):  
Piotr Hadaj ◽  
Marek Nowak ◽  
Dominik Strzałka
Keyword(s):  
Complex Systems ◽  
Complex Networks ◽  
Real Data ◽  
Electrical Energy ◽  
Significant Drop ◽  
Average Efficiency ◽  
Grid Network ◽  
System Operator ◽  
Energy Network

A case study based on the real data obtained from the Polish PSE System Operator of the highest voltages electrical energy network is shown. The data about the interconnection exchange and some complex networks (graphs) parameters were examined, after the removal of selected nodes. This allowed to test selected network parameters and to show that the breakdown of only three nodes in this network can cause significant drop of its average efficiency.

scholarly journals Changing Media Framings of School Shootings: A Case Study of the Parkland School Shooting

2021 ◽  
Author(s):  
Jennifer LaRose ◽  
Jose Torres ◽  
Michael Barton
Keyword(s):  
Media Coverage ◽  
Media Framing ◽  
School Shootings ◽  
School Shooting ◽  
Front Page ◽  
The Social ◽  
Social Coping ◽  
Time Periods ◽  
Coping Model

The Parkland school shooting that occurred on February 14, 2018, ranks among the deadliest high school shootings in recorded history with 17 injuries and 17 casualties. Like other mass school shootings, this event garnered extensive media coverage, but little research has been conducted to examine how media framing for this event compares with previous school shootings. This study examines the framing of the Parkland school shooting by location over time using the Social Coping Model, which describes how collectives cope with and heal from traumatic events. Specifically, this study compares frames of front-page news articles from three local news outlets and three national outlets across three time periods in the immediate aftermath of the shooting. The results indicate the coverage of the Parkland shooting was similar to previous shootings, but the results also suggest a shift in media coverage. The implications for this shift are explored in the context of a changing media landscape while also noting the importance of the Social Coping Model towards understanding the dynamic process of framing school shootings.

scholarly journals Human Values in Textbooks: A Case Study of General Zia and Post-2010 Democratic Regimes

2017 ◽  
Vol 0101 (01) ◽  
Author(s):  
Qamar Abbas
Keyword(s):  
Human Values ◽  
Analysis Method ◽  
Primary Level ◽  
The Core ◽  
Democratic Regimes ◽  
Content Analysis Method ◽  
Time Periods ◽  
English Textbooks ◽  
A Minor

The study is qualitative in nature using the content analysis method of research. The core objective of the study has been to gauge and compare the values in the textbooks during two eras; viz, General Zia-ul-Haq (1978-1988) and Post-2010 democratic regimes. For this purpose, the textbooks of two different time periods have been selected – primary level (grade I to V) English (as a subject) textbooks published by the Punjab Textbook Board during General Zia-ul-Haq regime and the same level English textbooks published by the Punjab Textbook Board during post-2010 democratic regimes. The human values such as tolerance, patience, empathy, honesty, justice, equity, and humanism have been divided into some categories with further subcategories as indicators to match with the content of textbooks. The collected data revealed that neither the textbooks during the Zia-ul-Haq period nor the textbooks of post-2010 regimes promoted these values in the students, as they ought to be. A minor percentage of human values have been found in the textbooks of both eras.

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