Dynamic Instability in Quartering Seas—Part II: Analysis of Ship Roll and Capsize for Broaching

1996 ◽  
Vol 40 (04) ◽  
pp. 326-336
Author(s):  
K. J. Spyrou
Keyword(s):  
Design Methodology ◽  
Dynamic Instability ◽  
Global Analysis ◽  
Theoretical Background ◽  
Dynamic Effects ◽  
Arbitrary Initial Condition ◽  
Forced Turn ◽  
Surf Riding ◽  
Ship Roll ◽  
Ship Capsize

In earlier studies we have analyzed the phenomena which can generate loss of ship controllability in astern seas. In this paper we examine how the yaw instability associated with broaching can lead to roll instability and ship capsize. The dynamic effects responsible for capsize during the forced turn of broaching do not have their origin in the customary roll equation but are the result of interactions with other motions of the ship. Stability studies based solely on the roll equation are thus clearly inappropriate for this case where a multidimensional approach is deemed necessary. After presenting the theoretical background we set out a multi-degree method of global analysis which is based on transient maps. We apply this method to clarify how capsize occurs during the escape from surf-riding and also during transients from arbitrary initial condition of the ship. Our study establishes the connection between speed, heading, automatic control parameters and capsize. The proposed method can be useful in the context of a design methodology for minimizing the risk of ship capsize in astern seas.

Website removal from search engines due to copyright violation

2019 ◽  
Vol 71 (1) ◽  
pp. 54-71 ◽  
Author(s):  
Artur Strzelecki
Keyword(s):  
Search Engine ◽  
Search Engines ◽  
Design Methodology ◽  
Global Analysis ◽  
Domain Name ◽  
Content Type ◽  
Search Results ◽  
Internet Users ◽  
Copyright Violation

Purpose The purpose of this paper is to clarify how many removal requests are made, how often, and who makes these requests, as well as which websites are reported to search engines so they can be removed from the search results. Design/methodology/approach Undertakes a deep analysis of more than 3.2bn removed pages from Google’s search results requested by reporting organizations from 2011 to 2018 and over 460m removed pages from Bing’s search results requested by reporting organizations from 2015 to 2017. The paper focuses on pages that belong to the .pl country coded top-level domain (ccTLD). Findings Although the number of requests to remove data from search results has been growing year on year, fewer URLs have been reported in recent years. Some of the requests are, however, unjustified and are rejected by teams representing the search engines. In terms of reporting copyright violations, one company in particular stands out (AudioLock.Net), accounting for 28.1 percent of all reports sent to Google (the top ten companies combined were responsible for 61.3 percent of the total number of reports). Research limitations/implications As not every request can be published, the study is based only what is publicly available. Also, the data assigned to Poland is only based on the ccTLD domain name (.pl); other domain extensions for Polish internet users were not considered. Originality/value This is first global analysis of data from transparency reports published by search engine companies as prior research has been based on specific notices.

Dynamic Instability in Quartering Seas: The Behavior of a Ship During Broaching

1996 ◽  
Vol 40 (01) ◽  
pp. 46-59 ◽  
Author(s):  
K. J. Spyrou
Keyword(s):  
Steady State ◽  
Transient Analysis ◽  
Dynamic Instability ◽  
Dynamical Analysis ◽  
Wave Excitation ◽  
Periodic Motions ◽  
Regular Waves ◽  
Limit Sets ◽  
Diffraction Wave ◽  
Surf Riding

The dynamic stability of ships encountering large regular waves from astern is analyzed, with focus on delineating the specific conditions leading to the uncontrolled turn identified as broaching. The problem's formulation takes into account motions of the actively steered or controls-fixed vessel in surge-sway-yaw-roll with consideration of Froude-Krylov and diffraction wave excitation. Dynamical analysis of surf-riding is carried out for the general case of quartering waves, exploring the route periodic motions—surf riding, loss of stationary stability, turn, capsize. Steady-state and transient analysis is carried out in the system's multidimensional state-space in order to identify all existing limit sets and locate attracting domains. Broaching from periodic motions is also a part of the investigation.

Third-country nationals as intercultural boundary spanners in multinational corporations

2020 ◽  
Vol 28 (4) ◽  
pp. 521-547
Author(s):  
Christoph Barmeyer ◽  
Volker Stein ◽  
Jenny Marie Eberhardt
Keyword(s):  
Multinational Corporations ◽  
Design Methodology ◽  
Boundary Spanning ◽  
Theoretical Background ◽  
Third Party ◽  
Boundary Spanners ◽  
Structured Interviews ◽  
Content Type ◽  
Intercultural Management ◽  
Third Country Nationals

Purpose This paper aims to investigate the central roles, functions and competences of third-country nationals (TCNs) in intercultural boundary spanning in multinational corporations (MNCs): Why are TCNs particularly important for reducing complexity at the overlapping functional, geographic and external boundaries of MNCs with their related interferences and which role do they play as boundary spanners in cross-boundary collaboration? Design/methodology/approach After introducing the theoretical background on boundary spanning and TCNs, the methodology applied in this paper is a theory-driven, qualitative approach based on 13 in-depth semi-structured interviews with TNCs conducted in 10 MNCs. Findings The authors aggregate TCNs’ activities into four roles: disembedded cosmopolitan, intermediary, third party and team-related boundary spanner. They show that TCNs tend to understand the complex intercultural context between headquarters and subsidiaries, balance power asymmetries, use their in-between neutrality to create trust, and act in an interculturally highly competent way by using a great variety of intercultural and linguistic skills. The TCNs’ meta-competence permits a higher level, intellectual and abstract perspective, enabling TCNs to consider structures, objects and interactions from an affective distance. Research limitations/implications The differences between TCNs and “regular” expatriates or other interface managers are examined and methodological limitations as well as research implications are critically discussed. MNCs can intentionally assign TCNs with their related competence profiles when expecting boundary-spanning tasks. Originality/value This paper is one of the few published that undergirds the TCN concept with empirical data and illustrates the suitability of specific role-takers such as TCNs for some complex challenges in international and intercultural management settings.

Human capital and export performance in the Spanish manufacturing firms

2020 ◽  
Vol 15 (1) ◽  
pp. 99-119 ◽  
Author(s):  
José López Rodríguez ◽  
Bill Serrano Orellana
Keyword(s):  
Human Capital ◽  
Design Methodology ◽  
Export Performance ◽  
Theoretical Background ◽  
Manufacturing Firms ◽  
Export Intensity ◽  
Resource Based View ◽  
Content Type ◽  
Specific Human Capital ◽  
General Human Capital

Purpose The purpose of this paper is to investigate the effects of firms’ general and specific human capital on the export propensity and intensity. Design/methodology/approach The resource-based view of the firm provides the theoretical background to examine export performance. Empirical analysis is carried out using a national representative sample of Spanish manufacturing firms and employing Logit and Tobit models. Export performance is evaluated in a dual way, as export propensity and export intensity. In relation to human capital a distinction is made between general and specific human capital. Findings The results shown that differences exist in the effect of general and specific human capital. While the firms’ general human capital (education of the firm’s employees) affects both export propensity and intensity, only some dimensions of specific human capital (employees’ experience at the workplace) affects export propensity and intensity but no the employees’ training. Moreover, the firms’ general human capital generates greater changes than the effect of specific human capital on the export behavior. Originality/value This paper extends a line of research underexplored in the literature by analyzing the effect of organizational human capital on the firm’s export performance; moreover, it is the first study for Spanish manufacturing firms; the distinction between general and specific human capital enhances our comprehension of the human capital as a determinant of export performance. In relation to the specific human capital, besides training, we add a new variable related to experience at the workplace.

scholarly journals Application of the Analytical Hierarchy Process in sustainability in complex projects

2020 ◽  
Vol 15 (4) ◽  
pp. 134-157
Author(s):  
Josivan Leite Alves ◽  
Jeniffer de Nadae
Keyword(s):  
Construction Projects ◽  
Design Methodology ◽  
Theoretical Background ◽  
National Literature ◽  
Metropolitan Region ◽  
Analytic Hierarchy ◽  
Practical Applications ◽  
Complex Projects ◽  
Close Relationship ◽  
Hierarchy Process

Purpose – Analyze how complexity influences the implementation of sustainability in complex civil construction projects. Design/methodology/approach – Based on the proposal of indicators due to the composition of the theoretical background of this research, the Analytic Hierarchy Process (AHP) multi-criteria method was applied. Thus, the sampling for collection, through a questionnaire, was be limited to engineering professionals working in the Metropolitan Region of Cariri, extreme south of Ceará, more specifically in the cities Crato, Juazeiro do Norte, and Barbalha. Findings – In terms of the complexity of the projects, the research participants pointed out that changes made over time and the financial aspects are variables that considerably hinder the completion of the building. Finally, it was possible to notice that there is a close relationship between the indicators of complexity and sustainability, where the target audience of the research showed a strong tendency to consider the most important economic aspects of the design and execution of civil construction projects. Originality/value – This research contributes to the national literature by combining mathematical tools with practical applications. It encourages managers and academics to develop indicators for building a sustainability classification system for complex projects, according to their specificities. It also explains how the AHP determines the weights for each criterion, proposing a conceptual sustainability index module. Keywords - Sustainability. Civil Construction. Complexity. AHP

Followership behaviors and barriers to wealth creation

2015 ◽  
Vol 34 (3) ◽  
pp. 270-285 ◽  
Author(s):  
Linda A. Hayes ◽  
Cam Caldwell ◽  
Bryan Licona ◽  
Thomas E. Meyer
Keyword(s):  
Design Methodology ◽  
Theoretical Background ◽  
Future Research ◽  
Management Research ◽  
Wealth Creation ◽  
Short Term ◽  
Content Type ◽  
Leaders And Followers ◽  
Practical Implications ◽  
The Continuum

Purpose – The purpose of this paper is to further research in the leader-follower relationship by focussing on followership. Given the need to increase organizational collaboration and cooperation, this research identifies the nature of follower buy-in behaviors and characteristics and develops a continuum of increasing follower compliance to stewardship with the organization. Design/methodology/approach – This research integrates the insights of highly regarded researchers into a continuum of follower compliance to stewardship and proposes 12 propositions of leaders and followers that address the importance of creating an environment for improved collaboration and cooperation which ultimately leads to increased organizational competitiveness and profitability. Findings – A continuum of increasing follower buy-in is proposed with the first four zones drawn from past literature (indifference, acceptance, trust, and commitment) and a fifth zone, follower stewardship, being introduced in the paper. The authors argue that understanding and fostering follower behaviors along the continuum improves organizational effectiveness. Research limitations/implications – This research offers a framework of follower behaviors and characteristics and proposes 12 hypotheses of leaders and followers to improve competitiveness and profitability that can be tested in future research. Practical implications – This paper provides valuable insights to scholars and practitioners by creating a framework of follower buy-in behaviors and characteristics that will allow leaders to increase the effectiveness of organizational culture, practices, and procedures. The research proposes 12 hypotheses of leaders and followers that can be tested for improving organizational competitiveness and profitability. Social implications – The paper identifies barriers to creating followership including under-investing in human capital, treating followers as means rather than as ends, thinking short-term, breaking commitments, and so on. Originality/value – The research develops a solid theoretical background for categorizing and measuring follower buy-in to organizations and introduces follower stewardship to management research.

Leadership in a changing world: developing managers through a teaching and learning programme

2015 ◽  
Vol 53 (5) ◽  
pp. 1107-1124 ◽  
Author(s):  
Ann-Louise Holten ◽  
Anne Bøllingtoft ◽  
Inge Wilms
Keyword(s):  
Leadership Development ◽  
Teaching And Learning ◽  
Design Methodology ◽  
Theoretical Background ◽  
Holistic Learning ◽  
Leadership Performance ◽  
Content Type ◽  
Modern Work ◽  
Different Levels ◽  
Central Factors

Purpose – The purpose of this paper is to present a model for the development of effective leadership teaching and learning. The model takes central factors into account, which have previously been identified as obstacles to the successful development of leadership qualifications. The paper presents the theoretical background for the model and makes suggestions for its implementation in a teaching and learning programme. The model integrates overall elements related to human biology and transfer of learning into a holistic learning process, which more specifically emphasizes the transformational leadership elements of envisioning, translating, communicating and sustaining credibility during change. Design/methodology/approach – The teaching and learning programme is based on a comprehensive leadership learning model, which integrates different levels of knowledge, learning processes and learning formats. Findings – In the area of leadership development, the paper presents its teaching and learning programme as a way for managers to obtain leadership meta-skills, which can be applied and individually adapted to the changing demands and conditions of modern work life. Originality/value – The paper provides a valuable step towards increasing leadership performance through efficient teaching and learning.

CFD, system-based and EFD study of ship dynamic instability events: Surf-riding, periodic motion, and broaching

2011 ◽  
Vol 38 (1) ◽  
pp. 88-110 ◽  
Author(s):  
Hamid Sadat-Hosseini ◽  
Pablo Carrica ◽  
Frederick Stern ◽  
Naoya Umeda ◽  
Hirotada Hashimoto ◽  
...  
Keyword(s):  
Periodic Motion ◽  
Dynamic Instability ◽  
Surf Riding

Thermoelastic Dynamic Instability (TEDI) in Frictional Sliding of a Half-Space Against a Rigid Non-Conducting Wall

2006 ◽  
Vol 74 (5) ◽  
pp. 875-884 ◽  
Author(s):  
L. Afferrante ◽  
M. Ciavarella
Keyword(s):  
Friction Coefficient ◽  
Half Space ◽  
Dynamic Instability ◽  
Wave Number ◽  
Dynamic Effects ◽  
Conducting Wall ◽  
High Speeds ◽  
Constant Friction ◽  
Ill Posed ◽  
Low Speeds

In the sliding of half-spaces with constant friction coefficient, two classes of instabilities are well known: thermoelastic instability (TEI), which occurs for sufficiently long wavelengths and Dynamic Instability (DI), which happens at sufficiently high friction coefficient, and whose growth factor increases linearly with wave number. Although the two phenomena look therefore quite distinct, their coupling is discussed here for an elastic and conducting half-space sliding against a rigid and non-conducting wall. The coupling between thermal and dynamic effects is not always negligible. In fact, surprisingly, new areas of instability are found, called thermoelastic dynamic instabilities (TEDI), similar to TEI at high speeds and DI at low speeds. TEDI lowers the critical speed and friction coefficient in many conditions even to zero. At low speeds, TEDI is ill-posed as DI at small wavelengths, and hence a regularized friction law like the Rice-Ruina one would probably be needed to correct the results.

Rhetoric and narratives as equipment for living: spinning in Borgen

2014 ◽  
Vol 27 (5) ◽  
pp. 710-721 ◽  
Author(s):  
Ronald Soetaert ◽  
Kris Rutten
Keyword(s):  
Design Methodology ◽  
Meaning Making ◽  
Kenneth Burke ◽  
Theoretical Background ◽  
Major Focus ◽  
Content Type ◽  
Popular Narrative ◽  
Spin Doctor ◽  
Terministic Screens

Purpose – The purpose of this paper is to present a theoretical background for studying rhetoric and narratives as equipment for living. Analyzing a case study on spinning and the spin doctor in recent narratives with a major focus on the Danish TV-series Borgen. Arguing that narratives can be equipment for teaching. Design/methodology/approach – Introducing rhetorical concepts as tools for an analysis of narratives (based on the work of Kenneth Burke). Findings – The authors argue for the importance of rhetoric and narrative as tools for meaning-making, illustrate how spinning has become a major topic in recent fiction (and the TV-series Borgen in particular), and focus on how Borgen can be equipment for living from different “terministic screens.” Originality/value – The authors analyze how a popular narrative as Borgen can be read as equipment for living, focussing on how the spin doctor has become a major character in fiction, and illustrate what the authors can learn from narratives about rhetoric and spinning.

Sign in / Sign up

Export Citation Format

Share Document