bluuebunny/crossref_metadata_2025_split huggingface dataset:
Social network analysis of the Korean disaster-safety industry
Authors: Kim Byeong Je , Park Hyung-Guen , Chung Ji-Bum 
Published: November 2017

Purpose
The purpose of this paper is to identify the present structure of the Korean disaster-safety industry and propose ways to promote it.

Design/methodology/approach
The background of the emergence of the disaster and safety industry in Korea is reviewed, and business networks of 91 companies belonging to the disaster and safety industry in Korea are identified and analysed through a network analysis.

Findings
Korean Government is struggling to nurture the disaster and safety industry as it has been on last few decades. This paper finds that the current industry has an ambiguous market structure, and the industry tends to depend highly on the demand of public institutions.

Practical implications
The concept of the disaster and safety industry is not well established in other countries except for Korea. If Korea successfully fosters its disaster and safety industry through its proper understanding, it would bring both disaster risk reduction and economic benefits.

Originality/value
This paper analyses the market structure of the disaster and safety industry, which is uniquely emerging in Korea and rarely designated as an industry in other countries.
The socio-economic effects of remittances in the labour-exporting MENA countries
Authors: Awdeh Ali 
Published: November 2017

PurposeThe Middle East and North Africa (MENA) region is, at the same time, a major source and a major recipient of remittances, which could have significant implications on the economic and social developments of the region. The purpose of this paper is to analyse the socio-economic effects of the large remittance inflows in 12 remittance-dependent MENA countries.Design/methodology/approachThis study uses the vector autoregressive model and Granger causality test on the entire set of labour-exporting MENA countries, and covers the period 1991-2015. It also exploits nine (dependent) variables that represent the economic developments, external balance, employment, and the potential uses of remittances in these countries.FindingsThe study shows a positive and significant impact running from remittances to gross domestic product and household expenditures. On the other hand, the authors found that an increase in inflation or a decline in economic conditions result in a considerable increase in remittance inflows, proving the counter-cyclical nature of these transfers.Originality/valueIn addition of examining an understudied region, the paper provided many interesting concepts regarding the form of association between remittances and receiving countries’ economic conditions, and the relationship dynamics between remittances on one hand and several macro-economic and social variables on the other.
Funding liquidity risk and bank risk-taking in BRICS countries
Authors: Dahir Ahmed Mohamed , Mahat Fauziah Binti , Ali Noor Azman Bin 
Published: November 2017

PurposeThe purpose of this paper is to examine the effects of funding liquidity risk and liquidity risk on the bank risk-taking.Design/methodology/approachThis study employs a system generalized method of moments (GMM) estimation technique and a sample of 57 banks operating in BRICS countries over the period from 2006 to 2015.FindingsThe results reveal that liquidity risk has a significant and negative effect on the bank risk-taking, indicating that a decrease in liquidity risk contributes to higher bank risk-taking. The study also reveals that funding liquidity risk has the substantial impact on bank risk-taking, suggesting lower funding liquidity risk results in higher bank risk-taking. These results are consistent with prior assumptions.Research limitations/implicationsThe implications of this study highlight the fact that liquidity risk is a risk factor which drives the potential bank default, of which banks tend to take more risks when higher funding liquidity exists.Practical implicationsThis study offers a number of valuable implications for the policy makers as well as practitioners. The policy makers should take into account better liquidity risk management framework aimed at preventing banks from taking excessive risks. Bank executives must pay more attention on how banks could hold more liquid securities and cash. Less risk-taking reduces higher borrowing costs undermining earnings through imposing taxes on corporate.Originality/valueThis work uncovered that liquidity riskper seis an important and previously unidentified risk factor, specifically its effects on bank risk-taking and contributes to the view in support of holding more liquid securities than the past.
Price leadership in the South African foreign-exchange market: an empirical analysis
Authors: Shandu Philani , Boako Gideon , Alagidede Paul 
Published: November 2017

PurposeThe purpose of this paper is to investigate the information-based microstructure theory’s effectiveness in explaining short-term disturbances in currency prices by determining whether the price discovery process in the US dollar (USD) and South African rand (ZAR)-USD/ZAR spot market is led by an individual market agent, around an exogenous news event.Design/methodology/approachThe influence of central bank intervention-related events on USD/ZAR volatility is investigated through the application of Brown-Forsythe variance equality tests on individual dealer and market quotes. Furthermore, the study applies bivariate Granger-causality tests to individual dealers’ USD/ZAR spot rate quotes, in an effort to determine whether certain dealers can be established as price leaders around an exogenous news event.FindingsThe study finds significant evidence to suggest the USD/ZAR market price leadership of Nomura forex (FX) prior to the public announcement of a South African Reserve Bank intervention-related news event. This finding supports microstructure theory’s assertions regarding the existence of foreign-exchange market characteristics such as trader heterogeneity and private information.Research limitations/implicationsThe paper is conducted on a sample of eight USD/ZAR market agents, of which six are offshore dealers, and only two are located locally. Although these proportions are somewhat relatable to the locations of rand turnover, it would still be interesting to investigate the existence of price leadership solely amongst South African authorised FX dealers.Practical implicationsThe results suggest the existence and price relevance of private information, as well as the heterogeneous nature of USD/ZAR market participants, based on informational asymmetries. The outcomes of the paper are useful to market participants, researchers, and central banks alike.Originality/valueThough the study does not impugn the body of work related to the orthodox macroeconomic approaches to exchange rate determination, it seems apparent that much more microstructure-related research still has to be conducted in the context of emerging market currencies. It is this void that the current study has attempted to provide for in contribution to literature.
Investigations on influence of groove shapes for the journal bearing in high-speed and heavy-load press system
Authors: Chen Yu , Sun Yu , Cao Chunping 
Published: November 2017

Purpose
The purpose of this study is to investigate the hydrodynamic characteristics of journal bearings in a high-speed and heavy-load press system by considering thermal influence and cavitation.

Design/methodology/approach
A proper and effectual computational method is presented for steady-state analysis of fluid interaction in a rotor-bearing press system by combining computational fluid dynamics techniques.

Findings
The influences of eccentricity ratio, rotational speed and oil-film thickness on the hydrodynamic behavior of the journal bearing are studied.

Originality/value
The computational method can be used for creating a precise lubrication design for a journal bearing of a lubrication system.
Optimization of depositing uniform and wear-resistant diamond films on massive mechanical seals
Authors: He Yun , Sun Fanghong , Lei Xuelin 
Published: November 2017

Purpose
This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing uniform, wear-resistant and easily polished diamond coatings on massive mechanical seals in a large-scale vacuum chamber.

Design/methodology/approach
The computational fluid dynamics simulation test and its corresponding deposition experiment are carried out to improve the uniformity of diamond films on massive mechanical seals. The polishing properties and sealing performance of mechanical seals coated with three different diamond films (microcrystalline diamond [MCD], nanocrystalline diamond [NCD] and microcrystalline/nanocrystalline diamond [MNCD]) and uncoated mechanical seals are comparatively studied using the polishing tests and dynamic seal tests to obtain the optimized diamond coating type on the mechanical seals.

Findings
The substrate rotation and four gas outlets distribution are helpful for depositing uniform diamond coatings on massive mechanical seals. The MNCD-coated mechanical seal shows the advantages of high polishing efficiency in the initial polishing process and excellent wear resistance and self-lubrication property in the follow-up polishing period because of its unique composite diamond film structures. The MNCD-coated mechanical seal shows the longest working life under dry friction condition, about 14, 1.27 and 1.9 times of that for the uncoated, MCD and NCD coated mechanical seals, respectively.

Originality/value
The effect of substrate rotation and gas outlets distribution on temperature and gas flow field during diamond deposition procedure is simulated. The MNCD-coated mechanical seal exhibits a superior sealing performance compared with the MCD-coated, NCD-coated and uncoated mechanical seals, which is helpful for decreasing the operating system shut-down frequency and saving operating energy consumption.
A mass-conserving algorithm for piston ring dynamical lubrication problems with cavitation
Authors: He Zhenpeng , Gong Wenqin , Xie Weisong , Zhang Guichang , Hong Zhenyu 
Published: November 2017

Purpose
Piston ring dynamic problem plays an important role in the lubricant characteristics of a reciprocating engine, which lead to engine wear and the increased consumption of lubricating oil. A cavitation analysis of the piston ring lubrication with two-dimensional Reynolds equation has rarely been reported owing to the complex working condition. The purpose of this study is to establish a precise model that can provide guidance for the design of the piston ring.

Design/methodology/approach
In this paper, a cavitation model and its effect on the piston ring lubrication was studied in a simulation program based on the mass-conserving theory which is solved by means of the Newton–Raphson method. In this study, some models such as mixed lubrication, asperity contact, blow-by/blow-back flow and cavitation have been coupled with the lubrication model.

Findings
The established model has been compared with the traditional model that deals with cavitation by using the Reynolds boundary condition algorithm. The cavitation zone, pressure distribution and density distribution between the piston ring and the cylinder have also been predicted. Studies of the changing trend for the pressure distribution and the cavitation zone at few typical crank angles have been listed to illustrate the cavitation changing rule. The analysis of the results indicates that the developed simulation model can adequately illustrate the lubrication problem of the piston ring system. All the analyses will provide guidance for the oil film rupture and the reformation process.

Originality/value
A two-dimensional cavitation model based on the mass-conserving theory has been built. The cavitation-forming and -developing process for the piston ring–liner lubrication has been studied. Non-cavitation occurs in the vicinity of top dead center and bottom dead center. The non-cavitation period will be longer in the vicinity of 360° of crank angle. The density distribution in the cavitation zone can be obtained.
An improved model on forecasting temperature rise of high-speed angular contact ball bearings considering structural constraints
Authors: Zheng De-xing , Chen Weifang , Li Miaomiao 
Published: November 2017

Purpose
Thermal performances are key factors impacting the operation of angular contact ball bearings. Heat generation and transfer about angular contact ball bearings, however, have not been addressed thoroughly. So far, most researchers only considered the convection effect between bearing housings and air, whereas the cooling/lubrication operation parameters and configuration effect were not taken into account when analyzing the thermal behaviors of bearings. This paper aims to analyze the structural constraints of high-speed spindle, structural features of bearing, heat conduction and convection to study the heat generation and transfer of high-speed angular contact ball bearings.

Design/methodology/approach
Based on the generalized Ohm’s law, the thermal grid model of angular contact ball bearing of high-speed spindle was first established. Next Gauss–Seidel method was used to solve the equations group by Matlab, and the nodes temperature was calculated. Finally, the bearing temperature rise was tested, and the comparative analysis was made with the simulation results.

Findings
The results indicate that the simulation results of bearing temperature rise for the proposed model are in better agreement with the test values. So, the thermal grid model established is verified.

Originality/value
This paper shows an improved model on forecasting temperature rise of high-speed angular contact ball bearings. In modeling, the cooling/lubrication operation parameters and structural constraints are integrated. As a result, the bearing temperature variation can be forecasted more accurately, which may be beneficial to improve bearing operating accuracy and bearing service life.
Wear morphology analysis and structural optimization of cone bit bearing seals
Authors: Yi Zhang , Xiaodong Zhang , Xueping Chang , Qian Wu 
Published: November 2017

Purpose
This paper aims to clarify the relationship between the cone bit seal failure and the down-hole drilling fluid pressure and high temperature that occur during ultra-deep well drilling. It proposes that the contact pressure distribution under low pressure conditions is favourable for lubrication and the seal inner wear is serious under high pressure conditions. Furthermore, the more reliable cone bit seal can be obtained using the back propagation (BP) neural network and genetic algorithm (GA) to reduce the drilling cost.

Design/methodology/approach
The wear morphologies of the seal surface were analyzed using Contour GT-K to determine the seal contact pressure distribution. Then, the influences of the drilling fluid pressure and high temperature on the metal seal interface were analyzed using finite element method. The structural parameters of the seal under high pressure were optimized based on the BP neural network and GA.

Findings
This paper proposes that the inner seal contact pressure increases rapidly with an increase in the drilling fluid pressure. The design parameters of the seal components should be adjusted reasonably to ensure that the outer contact pressure is greater than the inner contact pressure, which is advantageous for forming a lubricant film on the inner side of the seal. The uneven temperature distribution of the seal surface will further aggravate seal failure.

Originality/value
Study on the bit seal with good property is significant in drilling application, and the optimized seal can prolong the cone bit life.
Experimental and numerical analysis of a self-circulating oil bearing system for gear pumps
Authors: Jintao Mo , Chaohua Gu , Xiaohong Pan , Shuiying Zheng , Guangyao Ying 
Published: November 2017

Purpose
For moderate pressure and high pressure gear pumps, the temperature failure problem of bearings is now of considerable concern because of their heavy loads. However, the compact structure and the efficiency consideration make it extremely difficult to improve the bearing cooling. A self-circulating oil bearing system is developed for gear pumps with self-lubricating bearings to solve this problem. The oil is aspirated in from the low pressure chamber of the gear pump and discharged to the same chamber by using the pressure difference in the journal bearing, thus achieving the self-circulation.

Design/methodology/approach
An experiment test rig has been built for the feasibility study. The oil flow rate under different speeds has been recorded. Furthermore, the temperatures of the bearings with or without the oil circulation have been compared. Additionally, the oil flow in the test rig has been simulated using computational fluid dynamics codes.

Findings
The experimental and numerical results agree well. The experimental results indicate that the oil flow rate increases approximately linearly with the speed and the bearing temperature can be lowered successfully. The calculation results indicate that the bearing load capacity is nearly the same. Both the experimental and numerical studies establish that the self-circulating oil bearing system works successfully.

Originality value
As far as the authors know, it is the first time to find that the self-circulation can be built using the pressure difference in the bearing oil film, and this principle can be applied in the cooling and lubrication of the gear pumps to solve the temperature failure problem.
Solid lubrication with MoS2-Ti-C films for high-vacuum applications in a nuclear fusion experimental device
Authors: Shi Shanshuang , Wu Huapeng , Song Yuntao , Handroos Heikki 
Published: November 2017

Purpose
This paper aims to present a study on composite coating films for solid lubrication applied on the surface of bearings and gears, which are exposed to the vacuum vessel of a tokamak fusion experimental device running under ultra-high vacuum conditions. Experimental advanced superconducting tokamak is a tokamak fusion experimental device running under ultra-high vacuum conditions. To avoid polluting the inner vessel environment, solid lubrication has been applied on the surface of bearings and gears, which are exposed to the vacuum.

Design/methodology/approach
Anti-friction MoS2 coatings integrated with Titanium and Carbon have been developed using the multi-target magnetron sputtering deposition technique. This paper presents the comparative testing of tribological properties for three kinds of MoS2-based coating layers.

Findings
Based on the test results, MoS2-Ti-C coating films are supposed to be the final selection because of the better performance of friction coefficient and lubrication longevity.

Originality/value
Finally, the detailed information has been characterized for the hybrid coatings, which can provide some references for applications of solid lubrications under similar conditions of high vacuum and temperature.
Analysis of mixed lubrication of RV reducer turning arm roller bearing
Authors: Zhang Zhenhua , Wang Jiaxu , Zhou Guangwu , Pei Xin 
Published: November 2017

Purpose
This paper aims to solve the lubrication failures in the turning arm bearing of RV reducer, give some help in perfecting the bearing structure design and provide theoretical basis for the reducer’s performance improvement.

Design/methodology/approach
The paper establishes a mixed lubrication analysis model to study performance parameters. According to the discretization of parameters and iteration of equations, numerical simulation and theoretical analysis are achieved in computational process.

Findings
Considering influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing, the mixed lubrication analysis model is established to study the ratio of oil film thickness, pressure distribution and maximum von Mises stress in different speeds, temperatures and fillets. The results of mixed lubrication show that reasonable round corner modification, increase in temperature and speed, decrease of surface roughness and lubricant types can improve the lubrication performance.

Originality/value
The mixed lubrication analysis model is established to study the influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing. Different speed, temperature, lubricant and fillet modification are also considered in the research to analyze oil film thickness, pressure distribution and maximum von Mises stress. These studies can optimize structural design of bearing and direct engineer operations.
Leadership in crisis situations: merging the interdisciplinary silos
Authors: Paquin Hugo , Bank Ilana , Young Meredith , Nguyen Lily H.P. , Fisher Rachel , Nugus Peter 
Published: November 2017

Purpose
Complex clinical situations, involving multiple medical specialists, create potential for tension or lack of clarity over leadership roles and may result in miscommunication, errors and poor patient outcomes. Even though copresence has been shown to overcome some differences among team members, the coordination literature provides little guidance on the relationship between coordination and leadership in highly specialized health settings. The purpose of this paper is to determine how different specialties involved in critical medical situations perceive the role of a leader and its contribution to effective crisis management, to better define leadership and improve interdisciplinary leadership and education.

Design/methodology/approach
A qualitative study was conducted featuring purposively sampled, semi-structured interviews with 27 physicians, from three different specialties involved in crisis resource management in pediatric centers across Canada: Pediatric Emergency Medicine, Otolaryngology and Anesthesia. A total of three researchers independently organized participant responses into categories. The categories were further refined into conceptual themes through iterative negotiation among the researchers.

Findings
Relatively “structured” (predictable) cases were amenable to concrete distributed leadership – the performance by micro-teams of specialized tasks with relative independence from each other. In contrast, relatively “unstructured” (unpredictable) cases required higher-level coordinative leadership – the overall management of the context and allocations of priorities by a designated individual.

Originality/value
Crisis medicine relies on designated leadership over highly differentiated personnel and unpredictable events. This challenges the notion of organic coordination and upholds the validity of a concept of leadership for crisis medicine that is not reducible to simple coordination. The intersection of predictability of cases with types of leadership can be incorporated into medical simulation training to develop non-technical skills crisis management and adaptive leaderships skills.