scholarly journals Urban Spatial Structures From Human Flow By Hodge-Kodaira Decomposition

2021 ◽  
Author(s):  
Takaaki Aoki ◽  
Shota Fujishima ◽  
Naoya Fujiwara
Keyword(s):  
Scalar Potential ◽  
Social Activity ◽  
Gradient Flow ◽  
Mathematical Concept ◽  
Spatial Structures ◽  
Gradient Component ◽  
The Usa ◽  
Definition Of ◽  
Potential Landscape ◽  
Human Flow

Abstract Human flow in cities indicates social activity and can reveal urban spatial structures based on human behaviours for relevant applications. Scalar potential is a mathematical concept, and if successfully introduced, it can provide an intuitive perspective of human flow. However, the definition of such a potential to the origin-destination flow matrix and determination of its plausibility remain unsolved. Here, we apply Hodge-Kodaira decomposition, in which a matrix is uniquely decomposed into a potential-driven (gradient) flow and a curl flow. We depict the potential landscapes in cities due to commuting flow and reveal how the landscapes have been changed or unchanged by years or transport methods. We then determine how well the commuting flow is described by the potential, by evaluating the percentage of the gradient component for metropolitan areas in the USA and show that the gradient component is almost 100% in several areas; in other areas, however, the curl component is dominant, indicating the importance of circular flow along triangles of places. The potential landscape provides an easy-to-use visualisation tool to show the attractive places of human flow and will aid in various applications in commerce, urban design, and epidemic spreading.

Opportunities for improving the insider laws: A comparative analysis of the practice in the USA and Russia

2020 ◽  
Vol 26 (4) ◽  
pp. 796-814
Author(s):  
E.K. Ovakimyan
Keyword(s):  
Financial Markets ◽  
Insider Trading ◽  
Negative Impact ◽  
Business Environment ◽  
Market Manipulation ◽  
Insider Information ◽  
Analysis And Synthesis ◽  
The Usa ◽  
Legislative Perfection ◽  
Definition Of

Subject. The article examines the laws regulating insider trading. Objectives. The study outlines recommendations for refining Law On Countering the Illegal Use of Insider Information and Market Manipulation and Amendments to Some Legislative Acts of the Russian Federation, № 224-ФЗ of July 27, 2010. Methods. The methodological framework includes a general dialectical method, analysis and synthesis, induction and deductions, and some specific methods, such as comparative and formal logic analysis to specify the definition of insider information, structural logic and functional analysis to improve the mechanism for countering insider trading and market manipulation. Results. We discovered key drawbacks to be addressed so as to improve the business environment in Russia. Although the Russia laws mainly mirror the U.S. laws, they present a more extended list of terms concerning the insider information. I believe the legislative perfection should be continued. Conclusions and Relevance. The study helps apply the findings to outline a new legislative regulation or amend the existing ones, add a new mention on the course of financial markets to students’ books, develop new methods for detecting and countering and improving the existing ones. If all parties to insider relationships use the findings, they will prevent insider trading crimes in financial markets and (or) reduce the negative impact of such crimes on the parties.

scholarly journals Solving puzzles in deformed JT gravity: phase transitions and non-perturbative effects

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Clifford V. Johnson ◽  
Felipe Rosso
Keyword(s):  
Phase Structure ◽  
Scalar Potential ◽  
String Equation ◽  
Two Dimensional ◽  
Leading Order ◽  
Classical Analysis ◽  
First Order ◽  
First Order Phase Transition ◽  
Definition Of ◽  
First Order Phase

Abstract Recent work has shown that certain deformations of the scalar potential in Jackiw-Teitelboim gravity can be written as double-scaled matrix models. However, some of the deformations exhibit an apparent breakdown of unitarity in the form of a negative spectral density at disc order. We show here that the source of the problem is the presence of a multi-valued solution of the leading order matrix model string equation. While for a class of deformations we fix the problem by identifying a first order phase transition, for others we show that the theory is both perturbatively and non-perturbatively inconsistent. Aspects of the phase structure of the deformations are mapped out, using methods known to supply a non-perturbative definition of undeformed JT gravity. Some features are in qualitative agreement with a semi-classical analysis of the phase structure of two-dimensional black holes in these deformed theories.

Ciguapas in New York: Transcultural Ethnicity and Transracialization in Dominican American Performance

2012 ◽  
Vol 46 (1) ◽  
pp. 139-153 ◽  
Author(s):  
EMILIA MARÍA DURÁN-ALMARZA
Keyword(s):  
New York ◽  
Dominican Republic ◽  
Identity Formation ◽  
The Usa ◽  
And Migration ◽  
The 1960S ◽  
Definition Of ◽  
Dominican Women ◽  
The Impact ◽  
Dominican American

The Dominican American community in New York is perhaps one of the best examples of how processes of transculturation are affecting traditional definitions of ethnic identification. Given the intense economic, social and cultural transnational exchanges between the island and the USA from the 1960s, Dominicanyorks have been challenging the illusion of homogeneity in the definition of Americanness for decades, creating transnational social networks that transcend traditional national and ethnographic boundaries. The theatrical works of Josefina Báez, a Dominican American performer living in New York, and Sherezada (Chiqui) Vicioso, a Dominican poet and playwright who lived and worked in the US metropolis for decades before moving back to the Dominican Republic, lyrically explore issues of diaspora, identity and migration and the impact these phenomena might have in the lives of migrant Dominican women. Presenting diasporic experiences from two differing but interconnected locales – New York and the Dominican Republic – these plays offer two complementary views on the ways in which ethnicity, race, social class, age and geopolitical location interact in the formation of transcultural identities, thus contributing to develop a hemispheric approach to the study of identity formation in the Americas.

scholarly journals One method, two worlds

Groupwork ◽  
2014 ◽  
Vol 24 (2) ◽  
pp. 6
Author(s):  
Annie Pullen Sansfaçon ◽  
Valérie Roy ◽  
Dave Ward
Keyword(s):  
Social Work ◽  
Research Project ◽  
Organisational Context ◽  
Current State ◽  
Local Contexts ◽  
The World ◽  
The Usa ◽  
Definition Of

<p>Looking at practices in different locations is beneficial since it helps challenge assumptions that we may take for granted. Groupwork, as a method of social work, is specifically interesting to explore in the light of different contexts since, like social work, it may or may not translate well across cultures. This paper draws from data collected in the context of a research project that aimed to describe the current state of social work with groups in Quebec and to explore trends within social work with groups elsewhere in the world. Specifically, it focuses on the exploration of practices in Quebec and discusses them in relationship to those found in the USA, as a counterpoint. Our findings highlight some differences and similarities between Quebec and the USA with regard to groupwork, which leads us to discuss a range of factors that may impact on groupwork in the different contexts. Of these, the differences of organisational context and organisation of services have emerged as particularly noteworthy, which echoes findings in general social work literature with regard to the importance of local contexts on the definition of practice itself.</p>

scholarly journals Library and Information Science in the USA and Iran

2020 ◽  
Author(s):  
Michel Nguessan ◽  
Shima Moradi
Keyword(s):  
Science Education ◽  
General Education ◽  
Information Science ◽  
Comparative Investigation ◽  
Critical Discussion ◽  
Library Science ◽  
Library And Information Science ◽  
Historical Perspectives ◽  
The Usa ◽  
Definition Of

In a context of global mobility of skilled professionals, this is a comparative study of library science education and librarianship in the USA and Iran. The study attempts to determine how education and professional skills may transfer from one country to another. Historically, the USA and Iran are two different major centers of development of knowledge, science and technology and culture. Each one of these two countries developed its own system of general education and library science education and professional practice. This study investigates the definition of the librarian profession, historical perspectives, types of librarians and librarian-related positions, the initial academic training of librarian (schools, duration, curriculum, and accreditation), daily activities of librarians, continuing education, and opportunities and challenges of the profession in each country. The qualitative research methods was selected to conduct this study. This investigation leads to a comparative analysis pointing out similarities and differences. The first part of the paper present historical perspectives and library science education and librarianship. The second part of the paper presents contemporary library science education and librarianship in each country. The last part of the paper is a comparative critical discussion of both systems. This study concludes that, even though both systems are different, with the globalization of knowledge, education, and communications, under certain circumstances, one could consider a librarian &ldquo;qualified&rdquo; to practice across the border. Contributions: The comparative investigation of LIS profession and education have been conducted for the first time.

scholarly journals Interrupted time Series Design to Evaluate ICD-9-CM to ICD-10-CM Coding Changes on Trends in Colorado Emergency Department visits Related to Traumatic Brain Injury

2020 ◽  
Author(s):  
Lauren Alexis De Crescenzo ◽  
Barbara Alison Gabella ◽  
Jewell Johnson
Keyword(s):  
Public Health ◽  
Traumatic Brain Injury ◽  
Emergency Department ◽  
Brain Injury ◽  
Interrupted Time Series ◽  
Emergency Department Visits ◽  
P Value ◽  
Icd 10 ◽  
The Usa ◽  
Definition Of

Abstract Background. The transition in 2015 to the Tenth Revision of the International Classification of Disease, Clinical Modification (ICD-10-CM) in the USA led public health professionals to propose a surveillance definition of traumatic brain injury (TBI) that uses ICD-10-CM codes. The proposed definition excludes “unspecified injury of the head,” previously included in the ICD-9-CM TBI definition. The purpose of this study was to evaluate this change in surveillance methods on monthly rates of TBI-related emergency department visits in Colorado from 2012 to 2017.Results. The monthly rate of TBI-related emergency department visits in the transition month to ICD-10-CM (October 2015) decreased 41 visits per 100,000 population (p-value <0.0001), compared to September 2015, and remained low through December 2017, due to the exclusion of “unspecified injury of head” (ICD-10-CM code S09.90) in the proposed TBI definition. Conclusion. This study highlights a challenge in creating a standardized set of TBI ICD-10-CM codes for public health surveillance that provides comparable yet clinically relevant estimates over time. The findings inform estimation of TBI magnitude based on ICD coded data and decisions about allocating TBI resources based on an estimated TBI magnitude.

Signal Recovery by Linear Estimation

2019 ◽  
pp. 260-385
Author(s):  
John Stillwell
Keyword(s):  
Human Activities ◽  
Mathematical Concept ◽  
Rational Numbers ◽  
Precise Definition ◽  
Computable Analysis ◽  
Signal Recovery ◽  
Linear Estimation ◽  
Definition Of ◽  
Computable Sequence ◽  
Informal Description

This chapter develops the basic results of computability theory, many of which are about noncomputable sequences and sets, with the goal of revealing the limits of computable analysis. Two of the key examples are a bounded computable sequence of rational numbers whose limit is not computable, and a computable tree with no computable infinite path. Computability is an unusual mathematical concept, because it is most easily used in an informal way. One often talks about it in terms of human activities, such as making lists, rather than by applying a precise definition. Nevertheless, there is a precise definition of computability, so this informal description of computations can be formalized.

scholarly journals A Review of the Main Issues on the Loan Contracts: Asymmetric Information, Poor Transparency, and Hidden Costs

Economies ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 91
Author(s):  
Rundo ◽  
Luigi Di Stallo
Keyword(s):  
Financial Indicators ◽  
Subprime Mortgage ◽  
Financial Reforms ◽  
Loan Contracts ◽  
Information Gap ◽  
Specific Objective ◽  
Default Rates ◽  
The Usa ◽  
Definition Of ◽  
Over Time

The well-known subprime mortgage crisis, which began to manifest in early 2007, since when the effects of the speculative bubble begin to become evident from the increase in default rates in residential mortgages, has triggered a global crisis that has pushed various legislations over time to implement a series of financial reforms with the specific objective of avoiding that similar phenomena could be repeated over time. The ability to repay a loan is strongly influenced by the amortization algorithm that the bank has decided to adopt. This appears even more evident in variable interest rate loans since, as the economic conditions of the indexation parameter change, the definition of the loan balance and the related portion of interest will be decisive in relation to the borrower’s ability to repay the loaned capital. A study of the main amortization algorithms and the related descriptions in the bank contracts will allow us to show which are the main issues due to an information asymmetry that, unfortunately, characterizes this type of contract and would seem to be one of the main reasons that lie at the root of the aforementioned crisis of subprime mortgages in the USA. Moreover, the authors will provide a clear analysis of the financial indicators usually reported in loan contracts and how often these indications are insufficient to characterize the actual cost of the loan. Furthermore, by highlighting the discretionary choice that banks often obtain following the contractual loan schemes commonly offered to retail and corporate clients, we will show how this often translates into greater cost to the borrower. Finally, we will propose two possible solutions to the problems highlighted, thus allowing us to reduce this information gap, which unfortunately translates into greater costs for customers with the associated increase in default rates, or the so-called nonperforming loan (NPLs) contracts. Therefore, the objective of this contribution is to show which are the most critical aspects of the bank contracts related to contractual transparency and to the presence or otherwise of hidden costs, i.e., not expressly shown in the contract. Specifically, we refer to the loan contracts issued in Italy both with reference to the local banking legislation and to the European one to which Italy must often refer.

scholarly journals Renormalon-free definition of the gluon condensate within the large-$\beta_0$ approximation

2019 ◽  
Vol 2019 (10) ◽  
Author(s):  
Hiroshi Suzuki ◽  
Hiromasa Takaura
Keyword(s):  
Operator Product Expansion ◽  
Density Operator ◽  
Gradient Flow ◽  
Gluon Condensate ◽  
Operator Product ◽  
Clear Definition ◽  
Lattice Data ◽  
Perturbative Calculation ◽  
Yang Mills ◽  
Definition Of

Abstract We propose a clear definition of the gluon condensate within the large-$\beta_0$ approximation as an attempt toward a systematic argument on the gluon condensate. We define the gluon condensate such that it is free from a renormalon uncertainty, consistent with the renormalization scale independence of each term of the operator product expansion (OPE), and an identical object irrespective of observables. The renormalon uncertainty of $\mathcal{O}(\Lambda^4)$, which renders the gluon condensate ambiguous, is separated from a perturbative calculation by using a recently suggested analytic formulation. The renormalon uncertainty is absorbed into the gluon condensate in the OPE, which makes the gluon condensate free from the renormalon uncertainty. As a result, we can define the OPE in a renormalon-free way. Based on this renormalon-free OPE formula, we discuss numerical extraction of the gluon condensate using the lattice data of the energy density operator defined by the Yang–Mills gradient flow.

Exploring the Common Ground of Virtual Communities

2002 ◽  
pp. 67-75 ◽  
Author(s):  
Vanessa Dirksen ◽  
Bas Smit
Keyword(s):  
Virtual Communities ◽  
Common Ground ◽  
Social Activity ◽  
Virtual Community ◽  
Constructive Work ◽  
Information And Communication ◽  
Actual Field ◽  
The Common ◽  
Research Questions ◽  
Definition Of

A great deal of the literature on virtual communities evolves around classifying the phenomenon1 while much empirically constructive work on the topic has not been conducted yet. Therefore, the research discussed in this paper proposes to explore the actual field of the virtual community (VC). By means of a comparative ethnographic research, virtual communities are to be defined in terms of their inherent social activity, the interaction between the groups of people and the information and communication technology (ICT), and the meanings attached to it by its members. This chapter will report on the initial propositions, research questions and approach of the explorative research of working towards a “workable definition” of virtual communities. It will also present its “work to be done” which will ultimately form the basis of moving beyond defining virtual communities, i.e., actually designing and deploying one.

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