Homomorphic deconvolution

Geophysics ◽  
1983 ◽  
Vol 48 (7) ◽  
pp. 1014-1016 ◽  
Author(s):  
D. J. Jin ◽  
J. R. Rogers
Keyword(s):  
Reflection Coefficient ◽  
Additive Noise ◽  
Critical Role ◽  
Minimum Phase ◽  
Integration Algorithm ◽  
The Public ◽  
Band Limited ◽  
Frequency Transformations ◽  
Analytical Expressions ◽  
Phase Reflection

The advantages of homomorphic deconvolution are that it does not require the assumptions of minimum‐phase wavelet and of a white random reflection coefficient series. Disadvantages of the method which have been recognized in the public domain are difficulties in unwrapping the phase, in dealing with band‐limited signals, and in handling mixed‐phase reflection coefficient series. These difficulties may be respectively overcome by using an “adaptive numerical integration algorithm” (Tribolet, 1977), frequency transformations (Tribolet, 1979), and exponential weighting of the signal (Tribolet, 1979). There seems to have been some understanding in the literature and among exploration researchers that additive noise would affect the performance of homomorphic deconvolution. However, to the best of our knowledge there have not appeared in the literature any analytical expressions or experiments conclusively showing how additive noise affects homomorphic deconvolution. Analytic and experimental analyses demonstrated that additive noise plays a critical role in homomorphic deconvolution such that homomorphic deconvolution is unreliable whenever the spectral amplitudes of the signal are very small over certain frequency bands and even a small amount of noise is present. This unreliability of the method overshadows its advantages.

Implementation of a Dual-Frequency GLONASS and GPS L1 C/A Software Receiver

2010 ◽  
Vol 63 (2) ◽  
pp. 269-287 ◽  
Author(s):  
S. Abbasian Nik ◽  
M. G. Petovello
Keyword(s):  
Global Navigation Satellite System ◽  
Critical Role ◽  
Satellite System ◽  
Navigation Satellite ◽  
Dual Frequency ◽  
Software Receiver ◽  
The Public ◽  
Global Navigation ◽  
Global Navigation Satellite

These days, Global Navigation Satellite System (GNSS) technology plays a critical role in positioning and navigation applications. Use of GNSS is becoming more of a need to the public. Therefore, much effort is needed to make the civilian part of the system more accurate, reliable and available, especially for the safety-of-life purposes. With the recent revitalization of Russian Global Navigation Satellite System (GLONASS), with a constellation of 20 satellites in August 2009 and the promise of 24 satellites by 2010, it is worthwhile concentrating on the GLONASS system as a method of GPS augmentation to achieve more reliable and accurate navigation solutions.

Beyond the Grey Zone: Organization Research Publishing and Bibliodiversity in the Research Communication System

2021 ◽  
Vol 03 ◽  
Author(s):  
Amanda Lawrence
Keyword(s):  
Management Practices ◽  
Grey Literature ◽  
Critical Role ◽  
Academic Publishing ◽  
Grey Zone ◽  
Research Knowledge ◽  
Non Profit ◽  
The Public ◽  
Research Communication ◽  
Industry Sectors

Research publishing involves the production, use and management of research in a variety of genres and formats by commercial and non-profit academic publishers, and by organizations in government, civil society, university and industry sectors. However discussion of research publishing mainly tends to focus on the production and circulation of peer-reviewed academic journals and to a lesser extent books produced by commercial academic publishers. Research reports and papers produced by organizations outside the formal publishing system play a critical role in the research and development (R&D) system, yet they are often overlooked in studies on open scholarship and research communication. This is partly due to a lack of terminology to adequately describe the diverse publishing practices of organizations which operate across a spectrum from formal to informal economic activity. In this article I define and contextualise research publishing by organizations in relation to other forms of academic publishing and recent calls for greater bibliodiversity in scholarly communication. Commonly used terms such as ‘grey literature’ or ‘unpublished literature’ are inadequate to describe and account for the proliferation and importance of diverse research genres and formats able to be produced, published and disseminated in print and online by think tanks, government agencies, industry bodies and research centres. By taking a more holistic, systems-oriented approach to research publishing we can begin to understand the diverse actors, institutions and practices involved in knowledge production and develop appropriate policies, infrastructure and management practices to support an effective, efficient, equitable, credible and sustainable research knowledge commons in the public interest.

scholarly journals Staphylococcus aureuscoagulases are exploitable yet stable public goods in clinically relevant conditions

2018 ◽  
Vol 115 (50) ◽  
pp. E11771-E11779 ◽  
Author(s):  
Urvish Trivedi ◽  
Jonas S. Madsen ◽  
Jake Everett ◽  
Cody Fell ◽  
Jakob Russel ◽  
...  
Keyword(s):  
Public Goods ◽  
Social Evolution ◽  
Defense Mechanism ◽  
Critical Role ◽  
Local Population ◽  
Coagulation Cascade ◽  
The Public ◽  
Innate Defense ◽  
The Commons

Coagulation is an innate defense mechanism intended to limit blood loss and trap invading pathogens during infection. However,Staphylococcus aureushas the ability to hijack the coagulation cascade and generate clots via secretion of coagulases. Although manyS. aureushave this characteristic, some do not. The population dynamics regarding this defining trait have yet to be explored. We report here that coagulases are public goods that confer protection against antimicrobials and immune factors within a local population or community, thus promoting growth and virulence. By utilizing variants of a methicillin-resistantS. aureuswe infer that the secretion of coagulases is a cooperative trait, which is subject to exploitation by invading mutants that do not produce the public goods themselves. However, overexploitation, “tragedy of the commons,” does not occur at clinically relevant conditions. Our micrographs indicate this is due to spatial segregation and population viscosity. These findings emphasize the critical role of coagulases in a social evolution context and provide a possible explanation as to why the secretion of these public goods is maintained in mixedS. aureuscommunities.

Deliberation in Communication Studies

2018 ◽  
pp. 501-517
Author(s):  
John Gastil ◽  
Laura Black
Keyword(s):  
Critical Role ◽  
Ancient Greece ◽  
Communication Studies ◽  
Face To Face ◽  
The Public ◽  
Contemporary Work ◽  
Social Scientific ◽  
The Public Sphere

The discipline of communication encompasses a broad spectrum of humanistic, interpretive, and social scientific approaches to studying public deliberation. Early work engaged Habermasian theories of the public sphere, and rhetorical scholarship has foregrounded the deliberative threads running back to the discipline’s earliest history in ancient Greece. The bulk of contemporary work, however, has examined the dynamics of deliberation, particularly in the context of face-to-face discussions and dialogues in small groups. These studies have revealed the importance of narrative and dialogic exchanges during deliberation, as well as the critical role of facilitation and the maintenance of deliberative norms. Research has also assessed the practical consequences of participating in deliberation. The discipline’s practical orientation has led some scholars to seek ways to optimize deliberative designs to maximize simultaneously the quality of their decision outputs and their civic impacts on participants.

scholarly journals The Conditions and Challenges of the PR Industry in Pakistan in the 21st Century: Practitioners’ Perspective and Perceptions

2020 ◽  
Vol V (I) ◽  
pp. 55-61
Author(s):  
Mudassir Mukhtar ◽  
Salma Umber ◽  
Mudassar Hussain Shah
Keyword(s):  
Social Capital ◽  
Civil Society ◽  
Public Relations ◽  
Public Sphere ◽  
Qualitative Interviews ◽  
Critical Role ◽  
Private Institutions ◽  
National Narrative ◽  
The Public ◽  
Management Function

This paper contributes to the professional maturity of the profession by highlighting the problems faced by the practitioners and their professional solutions. The data and analysis are based on structured qualitative interviews of the highest ranked PR (public relation) professionals working as the heads of PR departments in government and private institutions. Practitioners urged to establish Pakistani public relations substructures well-suited with local cultural realities. Practitioners believed that public relations critical role in strengthening democracy in Pakistan to promote democratic traditions and usage of social capital, civil society and public sphere, recognitions of PR as a management function, preparation of a national narrative against terrorism, adoption of new technological advancements, less focusing on internal public and controlling unrealistic boss publicity are the major challenges in the public relations industry in Pakistan.

Public Sector Role in Sustainable Development

2018 ◽  
pp. 149-159
Author(s):  
Onesmus Gichuru
Keyword(s):  
Public Sector ◽  
Structural Changes ◽  
Critical Role ◽  
Institutional Reforms ◽  
Unequal Distribution ◽  
The Public ◽  
Progressive Development ◽  
Social Structural ◽  
The Reformation ◽  
Attitudinal Changes

Being at a global development crossroad under an era plagued by major global challenges including financial crisis, poor governance, economic inequalities, climate change, food insecurity, human rights injustices, among others calls for a concerted effort from all the stakeholders to play a critical role in development. These roles are to be embraced through market-driven and people-centered modalities that seek to address inefficiency in service delivery and unequal distribution of economic gains. To foster this, the public sector is at the central point in driving institutional reforms in safeguarding progressive development-oriented norms and practices within an economy. In this regard, strategic reforms ought to be upheld as multifaceted processes that involve social structural changes, attitudinal changes, national institutions reforms, economic growth acceleration, reduction of inequalities, and poverty eradication. Restructuring, participation, public-private partnership, accountability, human-resource issues are some of the reformation strategies identified in this chapter.

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