Graph-theoretic node importance mining in world city networks: methods and applications

2017 ◽  
Vol 45 (2) ◽  
pp. 57-65
Author(s):  
Shan Xue ◽  
Li Xiong ◽  
Zhao Lu ◽  
Jia Wu
Keyword(s):  
Method Development ◽  
Network Evolution ◽  
Transmission Mechanism ◽  
World City ◽  
Content Type ◽  
Graph Theoretic ◽  
Node Importance ◽  
Transmission Mechanisms ◽  
Network Topologies ◽  
World City Networks

Purpose This study aims to review the literature on graph-theoretic mining methods for node importance in both static and dynamic world city networks, which is correspondingly categorised by graph-theoretic node importance mining on network topologies and transmission mechanisms. Design/methodology/approach The authors overview the graph-theoretic indicators of node importance: centrality and power. Then, the methods of graph-theoretic node importance mining on network topologies are assessed with node relevance, centrality- and power-based measurements, heterogeneous fusion and other miscellaneous approaches. The latest progress in transmission mechanisms is also reviewed in this study involving network evolution, node immunisation and robustness in dynamics. Finally, the findings are analysed and future directions in this field are suggested. Findings The method development of node importance mining is driven by complex application-based problems within a transmission mechanism. Fusion measurements, based on centrality and power, are extended by other graph mining techniques in which power has a significant role. In conclusion, the trends of node importance mining focus on power-embedded fusion measurements in the transmission mechanism-based complex applications. Originality/value This is the first systematic literature review of node importance from the view of graph-theoretic mining.

Sukuk and monetary policy transmission in Indonesia: the role of asset price and exchange rate channels

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Suriani Suriani ◽  
M. Shabri Abd. Majid ◽  
Raja Masbar ◽  
Nazaruddin A. Wahid ◽  
Abdul Ghafar Ismail
Keyword(s):  
Monetary Policy ◽  
Exchange Rate ◽  
Interest Rates ◽  
Asset Price ◽  
Transmission Mechanism ◽  
Monetary Policy Transmission ◽  
Content Type ◽  
Policy Transmission ◽  
Monetary Policy Transmission Mechanism

Purpose The purpose of this study is to empirically analyze the role of sukuk in the monetary policy transmission mechanism through the asset price and exchange rate channels in the Indonesian economy. Design/methodology/approach Using the monthly data from January 2003 to November 2017, this study uses a multivariate vector error correction model causality framework. To examine the role of sukuk in the monetary policy transmission mechanism through the asset price channel, this study uses the variables of consumption, inflation, interest rates, economic growth and the composite stock price index. Meanwhile, to examine the role of sukuk in the monetary policy transmission mechanism through the exchange rate channel, this study used variables of inflation, interest rates, economic growth, foreign investment and exchange rate. Findings This study documented that sukuk has no causal relationship with inflation through asset price and exchange rate channels. Nevertheless, sukuk has a bidirectional causal relationship with economic growth through asset price and exchange rate channels. Sukuk is also documented to have a causal relationship with monetary policy variables of interest rate and stock prices through asset price and exchange rate channels. Finally, a unidirectional causality is recorded running from the exchange rate to sukuk in the exchange rate channel. Research limitations/implications The finding of independence of the sukuk market from interest rates provides evidence that the trading of the sukuk in Indonesia has been in harmony with the Islamic tenets. Practical implications The relevant Indonesian authorities need to enhance both domestic and global sukuk markets as part of efforts to promote the sustainability of Islamic capital market development in Indonesia. Originality/value To the best of the authors’ knowledge, this study is among the first attempts to empirically investigate the role of sukuk in monetary policy transmission through asset price and exchange rate channels in the context of the Indonesian economy.

Entrepreneurs’ network evolution – the relevance of cognitive social capital

2015 ◽  
Vol 21 (2) ◽  
pp. 197-223 ◽  
Author(s):  
Sara Jonsson
Keyword(s):  
Social Capital ◽  
Private Information ◽  
Three Dimensional ◽  
Network Evolution ◽  
Fashion Industry ◽  
Cognitive Dimension ◽  
Content Type ◽  
Start Up ◽  
The Creation ◽  
Cognitive Social Capital

Purpose – The purpose of this paper is to investigate entrepreneurs’ network evolution in the start-up phase. Design/methodology/approach – Based on the case studies of six fashion start-up firms, this study uses a three-dimensional perspective on social capital (structural, relational, cognitive) to investigate entrepreneurs’ network evolution (i.e. initiation of new relationships) in the start-up phase so as to acquire resources and support for firms’ goals. The study focuses particularly on the understudied cognitive dimension of social capital. The fashion industry provides a relevant research setting because it is characterised by changes in demand, which generate opportunities for entrepreneurship. Findings – The findings show that the display of cognitive attributes is important for the creation of structural social capital (the establishment of new relationships). The findings also indicate that relationships initiated based on the cognitive dimension have a high probability of developing into embedded relationships, thereby becoming high in the relational dimension and providing access to private information containing referrals to other actors. Thus, these relationships also promote the continued development of the structural dimension. Originality/value – The findings imply that the entrepreneurs’ sets of cognitive attributes constitute an important asset in the creation of social capital. They also point to the importance of signalling these values to potential resource holders. Relationships initiated through the display of cognitive attributes can provide resources without requiring immediate economic remuneration.

An integrated interpretive structural modeling and a graph-theoretic approach for measuring the supply chain complexity in the Indian automotive industry

2018 ◽  
Vol 29 (3) ◽  
pp. 478-514 ◽  
Author(s):  
Kavilal E.G. ◽  
Shanmugam Prasanna Venkatesan ◽  
Joshi Sanket
Keyword(s):  
Supply Chain ◽  
Automotive Industry ◽  
Structural Modeling ◽  
Theoretic Approach ◽  
Passenger Vehicle ◽  
Interpretive Structural Modeling ◽  
Content Type ◽  
Graph Theoretic ◽  
Graph Theoretic Approach ◽  
Numerical Index

Purpose Easily employable quantitative supply chain complexity (SCC) measures considering the significant dimensions of complexity as well as the drivers that represent those dimensions are limited in the literature. The purpose of this paper is to propose an integrated interpretive structural modeling (ISM) and a graph-theoretic approach to quantify SCC by a single numerical index considering the interdependence and the inheritance of the SCC drivers. Design/methodology/approach In total, 18 SCC drivers identified from the literature are clustered according to the significant dimensions of complexity. The interdependencies established through ISM and inheritance values of SCC drivers are mapped into a Variable Permanent Matrix (VPM). The permanent function of this VPM is then computed and the resulting single numerical index is the measure of SCC. Findings A scale is proposed by computing the minimum and maximum threshold values of SCC with the help of expert opinions of the Indian automotive industry. The complexity of commercial and passenger vehicle sectors within the automotive industry is measured and compared using the proposed scale. From the results, it is identified that the number of suppliers, increase in spare-parts due to shortened product life-cycle and demand uncertainties increase the SCC of the passenger vehicle sector, while number of parts, products and processes, variety of products and process and unreliability of suppliers increase the complexity of the commercial vehicle sector. The result indicates that various SCC drivers have a different impact on determining the SCC level of these two sectors. Originality/value The authors propose an integrated method that can be readily applied to measure and quantify SCC considering the significant dimensions of complexity as well as the interdependence and the inheritance of the SCC drivers that contribute to those dimensions. This index further helps to compare the complexity of the supply chain which varies between industries.

Evaluation of supply chain resilience index: a graph theory based approach

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nishtha Agarwal ◽  
Nitin Seth ◽  
Ashish Agarwal
Keyword(s):  
Supply Chain ◽  
Adjacency Matrix ◽  
Theoretic Approach ◽  
Worst Case ◽  
Content Type ◽  
Supply Chain Resilience ◽  
Graph Theoretic ◽  
Graph Theoretic Approach ◽  
Resilience Index ◽  
Index Value

PurposeThe present study aims at developing a model to quantify supply chain resilience as a single numerical value. The numerical value is called resilience index that measures the resilience capability of the case company's supply chain. The model calculates the index value based on the interactions between the enablers of supply chain resilience and its dimensions.Design/methodology/approachGraph theoretic approach (GTA) is used to evaluate the resilience index for the case company's supply chain. In GTA, the dimensions of resilience enablers and their interdependencies are modelled through a digraph. The digraph depicting the influence of each dimension is converted into an adjacency matrix. The permanent function value of the adjacency matrix is called the resilience index (RI).FindingsThe proposed approach has been illustrated in context of an Indian automobile organization, and value of the RI is evaluated. The best case and the worst-case values are also obtained with the help of GTA. It is noted from the model that strategic level dimension of enablers is most important in contributing towards supply chain resilience. They are followed by tactical and operational level enablers. The GTA framework proposed will help supply chain practitioners to evaluate and benchmark the supply chain resilience of their respective organizations with the best in the industry.Originality/valueA firm can compare the RI of its own supply chain with other's supply chain or with the best in the industry for benchmarking purpose. Benchmarking of resilience will help organizations in developing strategies to compete in dynamic market scenario.

Revisiting the impact of organized labor on corporate bottom lines

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dmytro Osiichuk ◽  
Paweł Mielcarz ◽  
Julia Kavalenka
Keyword(s):  
Financial Performance ◽  
Organized Labor ◽  
Corporate Financial Performance ◽  
Firm Level ◽  
Data Set ◽  
Content Type ◽  
International Panel ◽  
Transmission Mechanisms ◽  
Credible Threat ◽  
The Impact

Purpose Relying on an international panel data set, the purpose of this paper is to quantify the economic impact of labor unionization on corporate financial performance. Design/methodology/approach Static panel regression analysis is performed for a firm-level multinational data set to elucidate the postulated empirical relationships between employee unionization and corporate performance. The transmission mechanisms intermediating the studied effects are discussed and operationalized. Findings The empirical evidence demonstrates that firms with a higher level of employee unionization spend more on wages and labor-related expenses. The concomitant downside of higher resource extraction by unions is a lower rate of net employment creation and a higher possibility of redundancy layoffs. Originality/value Overall, the authors demonstrate that by creating a credible threat of employee disobedience manifested through strikes and internal wage disputes, labor unions remain an effective mechanism of increasing employees’ bargaining power. Despite the discovered weak negative associative link between the degree of unionization and corporate financial performance, the authors perceive the overall evidence to be inconclusive on this matter.

Re-examining the twin deficit hypothesis for major South Asian economies

2019 ◽  
Vol 12 (3) ◽  
pp. 265-287
Author(s):  
Shruti Shastri
Keyword(s):  
Time Series ◽  
Exchange Rate ◽  
Interest Rate ◽  
Sri Lanka ◽  
South Asian ◽  
Current Account ◽  
Transmission Mechanism ◽  
Asian Countries ◽  
Content Type ◽  
Long Run

Purpose The purpose of this study is to revisit the twin deficit hypothesis (TDH) and provide insights into the transmission mechanism connecting budget deficits and current account deficits for five major South Asian countries, namely, India, Bangladesh, Pakistan Sri Lanka and Nepal for the period 1985-2016. Design/methodology/approach This study uses a multivariate framework including real interest rate, real exchange rate and real gross domestic product to avoid the possibility of incorrect inferences caused by omission of relevant mediating variables. The long-run relationship and causality are investigated through the autoregressive distributed lag bounds testing approach and Toda Yamamoto approach, respectively, for each individual country. The robustness of the results is assessed with the help of Westerlund’s cointegration test and group mean fully modified ordinary least squares (GM-FMOLS), group mean dynamic ordinary least square (GM-DOLS) and common correlated effect mean group (CCEMG) estimators in the panel framework. Findings Both time series and panel evidences indicate long-run relationship between budget balance (BB) and current account balance (CAB) together with the mediating variables. The results indicate bi-directional causation between the two balances for India and Bangladesh, TDH for Pakistan and Sri Lanka and the reverse causation from CAB to BB for Nepal. Regarding the transmission mechanism, the results indicate the absence of the causal chain postulated by Mundell–Fleming, which predicts that BB causes CAB via interest rate and exchange rate. A CCEMG estimate of the import demand function reveals a positive government spending elasticity of imports suggesting that BB affects CAB by direct impact through demand. Originality/value This study augments the twin deficit literature on South Asian countries by providing insights into the transmission mechanism connecting the BB and CAB. Moreover, the study provides robust evidences on the TDH by using both time series and panel data techniques.

scholarly journals Dissemination of the blaNDM-5 Gene via IncX3-Type Plasmid among Enterobacteriaceae in Children

mSphere ◽  
2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Dongxing Tian ◽  
Bingjie Wang ◽  
Hong Zhang ◽  
Fen Pan ◽  
Chun Wang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Drug Resistance ◽  
Gene Transfer ◽  
Horizontal Gene Transfer ◽  
Klebsiella Pneumoniae ◽  
Pediatric Patients ◽  
Transmission Mechanism ◽  
Klebsiella Aerogenes ◽  
Content Type ◽  
E Coli

ABSTRACT The continuous emergence of novel New Delhi metallo-β-lactamase-5 (NDM-5)-producing Enterobacteriaceae isolates is receiving more and more public attention. Twenty-two NDM-5-producing strains were identified from 146 carbapenemase-producing Enterobacteriaceae (CRE) strains isolated from pediatric patients between January and March 2017, indicating that the blaNDM-5 gene has spread to children. All 22 isolates, including 16 Klebsiella pneumoniae strains, four Klebsiella aerogenes strains, and two Escherichia coli strains, showed significantly high resistance to β-lactam antibiotics (except aztreonam) but remained susceptible to tigecycline and colistin. K. pneumoniae and K. aerogenes strains were respectively defined as homologous clonal isolates by pulsed-field gel electrophoresis (PFGE). Multilocus sequence typing (MLST) results confirmed the genetic relatedness with all K. pneumoniae strains belonging to sequence type (ST) 48. Two E. coli isolates (ST617 and ST1236) were considered genetically unrelated. Twenty-two blaNDM-5 plasmids were positive for the IncX3 amplicon and showed almost identical profiles after digestion with HindIII and EcoRI. Four representative strains (K. pneumoniae K725, K. aerogenes CR33, E. coli Z214, and E. coli Z244) were selected for further study. Plasmids harboring blaNDM-5 showed strong stability in both clinical isolates and transconjugants, without apparent plasmid loss after 100 serial generations. S1-PFGE followed by Southern blot analysis demonstrated that the blaNDM-5 gene was located on an ∼46-kb plasmid. Plasmid sequences of pNDM-K725, pNDM-CR33, and pNDM-Z214 were almost identical but were slightly different from that of pNDM-Z244. Compared with pNDM-Z244, ΔISAba125 and partial copies of IS3000 were missing. The genetic backgrounds of the blaNDM-5 gene in four strains were slightly different from that of the typical pNDM_MGR194. This study comprehensively characterized the horizontal gene transfer of the blaNDM-5 gene among different Enterobacteriaceae isolates in pediatric patients, and the IncX3-type plasmid was responsible for the spread. IMPORTANCE The emergence of CRE strains resistant to multiple antibiotics is considered a substantial threat to human health. Therefore, all the efforts to provide a detailed molecular transmission mechanism of specific drug resistance can contribute positively to prevent the further spread of multidrug-resistant bacteria. Although the new superbug harboring blaNDM-5 has been reported in many countries, it was mostly identified among E. coli strains, and the gene transfer mechanism has not been fully recognized and studied. In this work, we identified 22 blaNDM-5-positive strains in different species of Enterobacteriaceae, including 16 Klebsiella pneumoniae strains, four Klebsiella aerogenes strains, and two Escherichia coli strains, which indicated the horizontal gene transfer of blaNDM-5 among Enterobacteriaceae strains in pediatric patients. Moreover, blaNDM-5 was located on a 46-kb IncX3 plasmid, which is possibly responsible for this widespread horizontal gene transfer. The different genetic contexts of the blaNDM-5 gene indicated some minor evolutions of the plasmid, based on the complete sequences of the blaNDM-5 plasmids. These findings are of great significance to understand the transmission mechanism of drug resistance genes, develop anti-infection treatment, and take effective infection control measures.

scholarly journals An Empirical Analysis of the Monetary Transmission Mechanism of Developing Economies: Evidence from Ghana

2018 ◽  
Vol 10 (4) ◽  
pp. 72
Author(s):  
Felix S. Nyumuah
Keyword(s):  
Developing Economies ◽  
Transmission Mechanism ◽  
Monetary Transmission ◽  
Clear Understanding ◽  
Monetary Transmission Mechanism ◽  
Developed Economies ◽  
Transmission Mechanisms ◽  
Long Run ◽  
Short Run ◽  
The Interest Rate

Policymakers need a clear understanding of their monetary transmission mechanisms for effective implementation of monetary policy. The aim of this study is to carry out an econometric analysis of the channels of monetary transmission mechanism in less developed economies so as to determine their effectiveness. The study uses Ghana macroeconomic data and finds the money supply channel to be the strongest in the long run while the exchange rate channel seems the strongest in transmitting monetary impulses in the short run. The interest rate and the bank credit to private sector channels emerge as very weak channels of monetary transmission.

A design approach for multi-configuration hybrid transmission mechanisms

2020 ◽  
Vol 234 (12) ◽  
pp. 2744-2758
Author(s):  
Yan-song Chen ◽  
I-Ming Chen ◽  
Tyng Liu
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Transmission Mechanism ◽  
Design Approach ◽  
Transmission Mechanisms ◽  
Power Split ◽  
Hybrid Transmission ◽  
Split Architecture ◽  
Multiple Configurations

Several hybrid architectures have been widely used in hybrid electric vehicles. For example, power-split architecture brings seamless operation, while parallel architecture makes the internal combustion engine directly drive the wheel. To combine the advantages of various architectures, this study aims to develop a design approach to create a transmission mechanism that has multiple configurations and uses these configurations to achieve several hybrid architectures. First, this study standardized hybrid transmission mechanisms using the Function Power Graph; this powerful and intuitive tool inspired several elements and an element layout for the new mechanisms. Then, several configurations with up to five elements were enumerated and organized into the databases. Next, the mechanisms with multiple configurations and a limited number of clutching units (clutches or brakes) were evaluated, 10 of which were identified as the best group that provided five parallel configurations, two 2-motor electric vehicle configurations, and a power-split configuration. At the end of this paper, a novel hybrid transmission mechanism was developed as a demonstration. It provides higher power and torque at the output but there is no need to use the larger internal combustion engine or motor-generators. This mechanism also enables the internal combustion engine to drive in overdrive parallel architectures to avoid the loss in energy conversion when the power-split architecture is not required. As a result, after a designer specifies the desired hybrid configurations, follows the procedure, and uses the configuration databases built in this study, a novel hybrid transmission mechanism will be created.

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