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Abstract

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Journal of Intellectual Capital, vol. 22 no. 1
Type: Research Article
ISSN: 1469-1930

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Book part
Publication date: 18 January 2021

Albert N. Link

Abstract

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Collaborative R&D and the National Research Joint Venture Database: A Statistical Analysis
Type: Book
ISBN: 978-1-83909-575-7

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Article
Publication date: 15 June 2021

Xixian Lin, Yuming Zhang, Yimeng Zhang and Guangjian Rong

The purpose of this study is to design a more flexible and larger range of the dimming circuit that achieves the independence of multiple LED strings drive and can…

Abstract

Purpose

The purpose of this study is to design a more flexible and larger range of the dimming circuit that achieves the independence of multiple LED strings drive and can time-multiplex the power circuit.

Design/methodology/approach

The state-space method is used to model the BUCK circuit working in Pseudo continuous conduction mode, analyze the frequency characteristics of the system transfer function and design the compensation network. Build a simulation platform on the Orcad PSPICE platform and verify the function of the designed circuit through the simulation results. Use Altium Designer 16 to draw the printed circuit board, complete the welding of various components and use the oscilloscope, direct current (DC) power supply and a signal generator to verify the circuit function.

Findings

A prototype of the proposed LED driver is fabricated and tested. The measurement results show that the switching frequency can be increased to 1 MHz, Power inductance is 2.2 µH, which is smaller than current research. The dimming ratio can be set from 10% to 100%. The proposed LED driver can output more than 48 W and achieve a peak conversion efficiency of 91%.

Originality/value

The proposed LED driver adopts pulse width modulation (PWM) dimming at a lower dimming ratio and adopts DC dimming at a larger dimming ratio to realize switching PWM dimming to analog dimming. The control strategy can be more precise and have a wide range of dimming.

Details

Circuit World, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0305-6120

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Article
Publication date: 8 June 2021

Knut Lehre Seip and Dan Zhang

This study aims to address the fundamental question on how the major players in the economy dynamically interact with each other: among the central bank, the investors in…

Abstract

Purpose

This study aims to address the fundamental question on how the major players in the economy dynamically interact with each other: among the central bank, the investors in the bond market and the firms and consumers that contribute to the economic growth, who gets information from whom, when and why?

Design/methodology/approach

To answer “who follows whom,” the authors apply a novel technique to examine the lead–lag relations between three time series, the federal funds rate, the treasury yield curve and the gross domestic product (GDP). To investigate “when and why,” the authors combine the lead–lag relations with principal component analysis to cluster economic states that are similar with respect to the eight macroeconomic variables.

Findings

The authors show that during the period 1977–2019, the bond market potentially obtained information from the federal funds rate (61% of the time) and less often (34% of time) from the changes in the GDP. Meanwhile, the funds rate decision by the Federal Reserve seems to lead the economic growth about 63% of the time. The analysis also suggests that the bond market obtained information directly from GDP when unemployment and inflation was high. In addition, the authors find that the federal funds rate was leading the GDP when the GDP deviated from the target value, consistent with the Federal Reserve’s policy of boosting and damping the economy when the GDP growth is low or high, respectively.

Originality/value

This study provides insights into the fundamental questions that have important implications for empirical work on the monetary policy, financial stability and economic activities.

Details

Journal of Financial Economic Policy, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1757-6385

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Article
Publication date: 30 April 2021

Tali Gazit

Facebook community leaders, often nonprofessionals who make a personal decision to create and manage online spaces, are becoming key players on social media sites. Using…

Abstract

Purpose

Facebook community leaders, often nonprofessionals who make a personal decision to create and manage online spaces, are becoming key players on social media sites. Using the theoretical framework of the uses and gratifications theory, this paper reveals the motivations of these individuals who are responsible for the community's information flow, limits and members' well-being. While some studies have begun acknowledging community leaders' important role in the social media, very little is known about their motivations for creating and leading the communities, often voluntarily.

Design/methodology/approach

Using both quantitative and qualitative analyses, data were collected through a survey of 94 Facebook community leaders about their motivations for creating and leading their communities.

Findings

The content analysis of the open-ended question reveals that leaders are motivated to create communities to satisfy informational needs, social needs and individual interests. A factor analysis shows five distinct motivations for leading: social, personal, influence, efficacy and community goals. Finally, a hierarchical regression indicates that extroversion, neuroticism, agreeableness, time spent per day and being the creator of the community can predict the level of motivation to lead the Facebook community.

Originality/value

As more and more organizations use online communities, the findings of this study may provide insights into leaders' motivations that can help organizations select their community leaders. This study expands on current research about a popular communication tool, Facebook communities, by examining it within the context of the unique role of online leadership in the social media environment.

Details

Aslib Journal of Information Management, vol. 73 no. 3
Type: Research Article
ISSN: 2050-3806

Keywords

Content available
Article
Publication date: 31 May 2021

Fredrik Tiedemann, Joakim Wikner and Eva Johansson

The purpose of the study is to describe the implications of strategic lead times (SLTs) for return on investment (ROI).

Abstract

Purpose

The purpose of the study is to describe the implications of strategic lead times (SLTs) for return on investment (ROI).

Design/methodology/approach

This study was part of an interactive research project and is based on the logic of theory application leading to theory building. It uses a multiple case study with five holistic single cases. Empirical data (ED) have mainly been collected from interviews and focus groups.

Findings

The length of and uncertainty in SLTs have implications for companies' financial performance. These implications vary in strength and can be either direct or indirect. These findings are incorporated into a framework on SLTs' implications for ROI.

Research limitations/implications

The presented array of SLTs' implications for ROI could be further investigated, focussing on their strength. Additionally, it would be interesting to substantiate the findings in the context of environmental and social sustainability (i.e. the triple bottom line).

Practical implications

The findings offer practitioners a rich description and understanding of SLTs' actual implications for financial performance in terms of ROI. This knowledge can support practitioners in analysing supply chain designs based on financial performance.

Originality/value

Using a combination of a relative financial performance measure (ROI) and a set of SLTs (systems perspective), this study focuses on SLTs' actual implications for ROI. The findings provide evidence that different sections of a supply chain can have different implications for revenue, cost and investment (i.e. the three absolute measures related to ROI).

Details

Journal of Manufacturing Technology Management, vol. 32 no. 9
Type: Research Article
ISSN: 1741-038X

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Article
Publication date: 3 June 2021

Yumei Xu, Chaohui Wang and Tingting Zhang

This study aims to develop a measurement scale of tourism-led rural gentrification from the perspective of rural residents.

Abstract

Purpose

This study aims to develop a measurement scale of tourism-led rural gentrification from the perspective of rural residents.

Design/methodology/approach

The procedure for developing the measurement scale included a thorough review of related literature on tourism-led rural gentrification and multiple stages of qualitative and quantitative investigations. A total of 1,080 rural residents in Huzhou and Huangshan participated in the project. The semi-structured interviews and questionnaire were applied to collect the data. This study analyzed the data with the methodologies of exploratory factor analysis, confirmatory factor analysis and structural equation modeling.

Findings

The measurement scale developed in this study included seven dimensions: Accelerated Ecological Awareness, Individual Behavior, Rural Economic Development, Enhanced Living Standards, Talents and Demographic Changes, Human and Cultural Shift and Cohesive Community.

Research limitations/implications

This measurement scale was developed and validated in China and may not be relevant in other contexts. The scale focuses on tourism-led rural gentrification only from the perspective of rural residents. The findings broaden the knowledge on tourism-led rural gentrification by researching the topic from the point of view of rural residents.

Practical implications

For policymakers and tourism enterprises, this study provides a valuable index for a full understanding of tourism-led rural gentrification. For investors, the research offers insights for priority investments to advance tourism development in rural regions.

Originality/value

This study is one of the few attempts to empirically measure tourism-led rural gentrification. The results improve on the knowledge about tourism-led rural gentrification in China.

研究目的

本研究的主要目的是从居民视角开发和验证旅游引导的乡村绅士化测量量表。

研究设计和方法

开发和验证旅游引导的乡村绅士化测量量表主要包含两方面的工作:旅游引导的乡村绅士化相关文献梳理; 多阶段的定量和定性研究。本研究共邀请1080位研究对象参与调研, 并通过深度半结构访谈和调查问卷收集数据, 使用EFA、CFA和SEM等研究方法研究结果。

研究结论

本研究开发和验证的测量量表包括7个维度:文明素养感知、经济发展感知、生活水平感知、发展环境感知、社会风尚感知、人居环境感知和社区秩序感知。

研究的局限性/意义

本研究基于中国背景开发和验证了旅游引导的乡村绅士化测量量表, 未验证该量表在其他国家或地区的普适性, 且仅从居民视角展开研究。我们的研究结果丰富了旅游引导的乡村绅士化内容。

实践意义

对于政策制定者和旅游企业来说, 本研究为他们充分了解旅游引导的乡村绅士化提供了参考; 对投资者来说, 本研究为投资者投资提供了有价值的借鉴和参考。

原创性/价值

本研究是测量旅游引导的乡村绅士化的重要尝试, 丰富了对中国旅游引导的乡村绅士化的认识。

关键词:

旅游引导的乡村绅士化 居民感知 量表开发 量表验证

文章类型: 研究型论文

Motivo de investigación

El objetivo principal del presente estudio es desarrollar y validar una escala de medición de gentrificación rural impulsada por el turismo desde la perspectiva de los residentes.

Diseño y metodología de investigación

El desarrollo y la validación de la presente escala de medición consistió en dos tareas principales: un examen de la literatura relacionada con la gentrificación rural impulsada por el turismo; y múltiples etapas de investigación cuantitativa y cualitativa. Para este estudio, se invitó a un total de 1080 sujetos para participar de esta investigación, los datos se obtuvieron mediante entrevistas y cuestionarios semiestructurados en profundidad, y los resultados se han analizado mediante EFA, CFA y SEM.

Conclusiones de la investigación

La escala de medición desarrollada y validada en este estudio consta de 7 dimensiones: percepción de alfabetismo civilizacional, percepción de desarrollo económico, percepción de nivel de vida, percepción de entorno de desarrollo, percepción de costumbres sociales, percepción de asentamiento humano y percepción de orden comunitario.

Limitaciones/significado de la investigación

Este estudio desarrolló y validó la escala de medición basada en un contexto chino, pero no se pudo generalizar la escala de medición en otros países o regiones. Esta investigación solo analiza el fenómeno de gentrificación rural impulsada por el turismo desde la perspectiva de los residentes. Nuestros resultados contribuyen a mejorar el contenido de la gentrificación rural impulsada por el turismo.

Significado práctico

Para los responsables políticos y las empresas de turismo, la presente investigación constituye una referencia para que comprendan plenamente la gentrificación rural impulsada por el turismo; para los inversores, constituye una valiosa referencia de inversión.

Originalidad/Valor

Este estudio es un importante intento para medir la gentrificación rural impulsada por el turismo y contribuye a enriquecer la comprensión de la gentrificación rural impulsada por el turismo de China.

Palabras clave

Gentrificación rural impulsada por el turismo, Percepción de los residents, Desarrollo de la escala, Validación de la escala

Tipo de papel

Trabajo de investigación

Details

Tourism Review, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1660-5373

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Article
Publication date: 8 March 2021

Muna E. Raypah, Mutharasu Devarajan and Shahrom Mahmud

One major problem in the lighting industry is the thermal management of the devices. Handling of thermal resistance from solder point to the ambiance of the light-emitting…

Abstract

Purpose

One major problem in the lighting industry is the thermal management of the devices. Handling of thermal resistance from solder point to the ambiance of the light-emitting diode (LED) package is linked to the external thermal management that includes a selection of the cooling mode, design of heatsink/substrate and thermal interface material (TIM). Among the significant factors that increase the light output of the of the LED system are efficient substrate and TIM. In this work, the influence of TIM on the luminous flux performance of commercial indium gallium aluminium phosphide (InGaAlP) low-power (LP) LEDs was investigated.

Design/methodology/approach

One batch of LEDs was mounted directly onto substrates which were glass-reinforced epoxy (FR4) and aluminium-based metal-core printed circuit boards (MCPCBs) with a dielectric layer of different thermal conductivities. Another batch of LEDs was prepared in a similar way, but a layer of TIM was embedded between the LED package and substrate. The TIMs were thermally conductive epoxy (TCE) and thermally conductive adhesive (TCA). The LED parameters were measured by using the integrated system of thermal transient tester (T3Ster) and thermal-radiometric characterization of LEDs at various input currents.

Findings

With the employment of TIM, the authors found that the LED’s maximum luminous flux was significantly higher than the value mentioned in the LED datasheet, and that a significant reduction in thermal resistance and junction temperature was revealed. The results showed that for a system with low thermal resistance, the maximum luminous flux appeared to occur at a higher power level. It was found that the maximum luminous flux was 24.10, 28.40 and 36.00 lm for the LEDs mounted on the FR4 and two MCPCBs, respectively. After TCA application on the LEDs, the maximum luminous flux values were 32.70, 36.60 and 37.60 lm for the FR4 and MCPCBs, respectively. Moreover, the findings demonstrated that the performance of the LED mounted on the FR4 substrate was more affected by the employment of the TIM than that of MCPCBs.

Research limitations/implications

One of the major problems in the lighting industry is the thermal management of the device. In many low-power LED applications, the air gap between the two solder pads is not filled up. Heat flow is restricted by the air gap leading to thermal build-up and higher thermal resistance resulting in lower maximum luminous flux. Among the significant factors that increase the light output of the LED system are efficient substrate and TIM.

Practical implications

The findings in this work can be used as a method to improve thermal management of LP LEDs by applying thermal interface materials that can offer more efficient and brighter LP LEDs. Using aluminium-based substrates can also offer similar benefits.

Social implications

Users of LP LEDs can benefit from the findings in this work. Brighter automotive lighting (signalling and backlighting) can be achieved, and better automotive lighting can offer better safety for the people on the street, especially during raining and foggy weather. User can also use a lower LED power rating to achieve similar brightness level with LED with higher power rating.

Originality/value

Better thermal management of commercial LP LEDs was achieved with the employment of thermal interface materials resulting in lower thermal resistance, lower junction temperature and brighter LEDs.

Details

Soldering & Surface Mount Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0954-0911

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Article
Publication date: 8 March 2021

Raymond Obayi and Seyed Nasrollah Ebrahimi

In a departure from the efficiency theory assumptions implicit in most supply chain risk management (SCRM) literature, this study aims to explore the role that external…

Abstract

Purpose

In a departure from the efficiency theory assumptions implicit in most supply chain risk management (SCRM) literature, this study aims to explore the role that external neo-institutional pressures play in shaping the risk management strategies deployed to mitigate transaction cost risks in construction supply chains (CSC).

Design/methodology/approach

A theory-elaborating case study is used to investigate how regulatory, normative and mimetic neo-institutional pressures underpin SCRM strategies in state-led and private-led CSC in China.

Findings

The study finds that institutionalized Confucianist networks serve as proxies for regulatory accountability and thereby create a form of dysmorphia in the regulatory, normative and mimetic drivers of SCRM strategies in state-led and private-led CSC in China.

Originality/value

The findings reveal that relational costs such as bargaining, transfer and monitoring costs underpin SCRM in state-led CSC. Behavioral costs associated with search, screening and enforcement are the core drivers of SCRM in private-led CSC. These differences in transaction cost drivers of SCRM arise from the risk-buffering effect of personalized Guanxi networks, creating variants of institutional pressures on actors' risk analysis, identification and treatment strategies in China. Considering China's global hegemony in construction and related industries, this study provides valuable insights for practitioners and researchers on the need for a constrained efficiency view of SCRM in global CSC.

Details

Supply Chain Management: An International Journal, vol. 26 no. 5
Type: Research Article
ISSN: 1359-8546

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Article
Publication date: 29 March 2021

Husam AlWaer, Susan Rintoul and Ian Cooper

This paper is concerned with what should happen after design-led events have been held to promote co-decision-making, between professionals and local stakeholders, in…

Abstract

Purpose

This paper is concerned with what should happen after design-led events have been held to promote co-decision-making, between professionals and local stakeholders, in collaborative planning of the built environment. Rather than being standalone, such events form one single step in a multi-stage collaborative planning process. What comes before and after them has to be acknowledged as important to their effective contribution to collaborative planning. This paper aims to make a case for giving more attention to the post-event stages of collaborative planning, to ensure that the involvement of the public produces real and tangible benefits.

Design/methodology/approach

Content analysis of both academic and grey literatures was undertaken to examine emerging advice on how to conduct decision-making, the implementation of outputs and the delivery of desired outcomes, after design-led events. A critical review of the post-event decision-making and delivery activities is offered, which aims to add to the current academic literature on the deployment of design-led events. An attempt is made to sketch out the characteristics of post-event stages, drawn from the literature and collated specific examples of collaborative planning investigated in Scotland.

Findings

Three key factors are identified as affecting the successful implementation of decisions reached at design-led events: (1) a shared follow-on plan, (2) an agreed action programme for delivering this and (3) a properly constituted and resourced delivery vehicle that can monitor and evaluate progress. A research agenda to address questions raised but left unanswered is suggested dealing with how the decision-making and delivery activities following design-led events in collaborative planning might be improved.

Originality/value

A research agenda to address questions raised but left unanswered is suggested dealing with how the decision-making and delivery activities following design-led events in collaborative planning might be improved.

Details

Archnet-IJAR: International Journal of Architectural Research, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2631-6862

Keywords

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