Search results

1 – 10 of 40
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 16 October 2009

Liping Zhang, Jun Xia, Xingyuan Song and Xiaofeng Cheng

With frequent floods occurring, and the fast economic development in China, attention must be paid to flood prevention, water supply, and forecasting precision. In particular…

224

Abstract

Purpose

With frequent floods occurring, and the fast economic development in China, attention must be paid to flood prevention, water supply, and forecasting precision. In particular, mid‐ and long‐term runoff prediction is being paid more and more attention by researchers, and it is also the most difficult problem to solve. The purpose of this paper is to apply chaos phase space theory to forecast river run off.

Design/methodology/approach

Because the hydrologic system is a complicated huge system, there exist high non‐linear characteristics in the space‐time change of hydrologic factors. According to theory of chaotic phase space, the paper established four models of the single‐point, multi‐point, lineal, and three‐parameter D(m,τ,k) models, they have stronger non‐linear mapping function and much more information in the time series than traditional ways.

Findings

The results of calculation show that the models are highly effective and worthy of popularization and application. It is reasonable and superior to use these models in mid‐ and long‐term hydrologic prediction.

Research limitations/implications

The method cannot reduce or eliminate the un‐prediction parts caused by the inner random factors, such as the noise information of the observed data.

Practical implications

The models are applied in the long‐term runoff prediction of Baishan reservoir.

Originality/value

The new approach of hydrology forecasting due to the theory of chaotic phase space. The paper is aimed at hydrology forecasting researches and engineers, especially those who dealt with the mid‐ and long‐term prediction.

Details

Kybernetes, vol. 38 no. 10
Type: Research Article
ISSN: 0368-492X

Keywords

Access Restricted. View access options
Article
Publication date: 28 June 2021

Romi Jain

A qualitative development is discernible in China’s pursuit of global influence in knowledge following the launch of the Belt and Road Initiative (BRI). China has embarked on…

81

Abstract

Purpose

A qualitative development is discernible in China’s pursuit of global influence in knowledge following the launch of the Belt and Road Initiative (BRI). China has embarked on expanding the frontiers of its higher education and research enterprise in different geographies, a subset of its global power project. This paper employs the geointellect concept to analyze this phenomenon.

Design/methodology/approach

The paper applies the geointellect model, formed inductively, to illuminate China’s geographical expanse in higher education and research.

Findings

The BRI has provided a platform for China to shape the educational architecture of the participating countries, apart from receiving a boost in its prestige by leading educational alliances and opening overseas research centres. In quantitative terms, it has made progress in specific knowledge metrics. Nevertheless, certain challenges and limitations need to be overcome.

Research limitations/implications

The role of a foreign policy in boosting a country’s knowledge profile has been identified. Future research directions have been provided in using the geointellect model.

Practical implications

This study provides a direction to evaluate the implications of China’s foreign policy for its knowledge segment, especially in terms of capturing its leading prowess in higher education and research.

Originality/value

It contributes a conceptual model to capture the different facets of China’s geointellect, with foreign policy, geography, higher education, and research being its constituents.

Details

Social Transformations in Chinese Societies, vol. 17 no. 1
Type: Research Article
ISSN: 1871-2673

Keywords

Access Restricted. View access options
Article
Publication date: 16 September 2024

Weiwei Yue, Yuwei Cao, Shuqi Xie, Kang Ning Cheng, Yue Ding, Cong Liu, Yan Jing Ding, Xiaofeng Zhu, Huanqing Liu and Muhammad Shafi

This study aims to improve detection efficiency of fluorescence biosensor or a graphene field-effect transistor biosensor. Graphene field-effect transistor biosensing and…

45

Abstract

Purpose

This study aims to improve detection efficiency of fluorescence biosensor or a graphene field-effect transistor biosensor. Graphene field-effect transistor biosensing and fluorescent biosensing were integrated and combined with magnetic nanoparticles to construct a multi-sensor integrated microfluidic biochip for detecting single-stranded DNA. Multi-sensor integrated biochip demonstrated higher detection reliability for a single target and could simultaneously detect different targets.

Design/methodology/approach

In this study, the authors integrated graphene field-effect transistor biosensing and fluorescent biosensing, combined with magnetic nanoparticles, to fabricate a multi-sensor integrated microfluidic biochip for the detection of single-stranded deoxyribonucleic acid (DNA). Graphene films synthesized through chemical vapor deposition were transferred onto a glass substrate featuring two indium tin oxide electrodes, thus establishing conductive channels for the graphene field-effect transistor. Using π-π stacking, 1-pyrenebutanoic acid succinimidyl ester was immobilized onto the graphene film to serve as a medium for anchoring the probe aptamer. The fluorophore-labeled target DNA subsequently underwent hybridization with the probe aptamer, thereby forming a fluorescence detection channel.

Findings

This paper presents a novel approach using three channels of light, electricity and magnetism for the detection of single-stranded DNA, accompanied by the design of a microfluidic detection platform integrating biosensor chips. Remarkably, the detection limit achieved is 10 pm, with an impressively low relative standard deviation of 1.007%.

Originality/value

By detecting target DNA, the photo-electro-magnetic multi-sensor graphene field-effect transistor biosensor not only enhances the reliability and efficiency of detection but also exhibits additional advantages such as compact size, affordability, portability and straightforward automation. Real-time display of detection outcomes on the host facilitates a deeper comprehension of biochemical reaction dynamics. Moreover, besides detecting the same target, the sensor can also identify diverse targets, primarily leveraging the penetrative and noninvasive nature of light.

Details

Sensor Review, vol. 44 no. 6
Type: Research Article
ISSN: 0260-2288

Keywords

Access Restricted. View access options
Article
Publication date: 3 December 2024

Lin Xiao, Xiaofeng Li and Jian Mou

Short-form video advertisements have recently gained popularity and are widely used. However, creating attractive short video advertisements remains a challenge for sellers. Based…

375

Abstract

Purpose

Short-form video advertisements have recently gained popularity and are widely used. However, creating attractive short video advertisements remains a challenge for sellers. Based on the visual-audio perspective and signaling theory, this study investigated the impacts of three visual features (number of shots, pixel-level image complexity and vertical versus horizontal formats) and two audio features (speech rate and average spectral centroid) on user engagement behavior.

Design/methodology/approach

We conducted a field study on TikTok. To test our various hypotheses, we used regression analysis on 2,511 videos containing product promotion information posted by 60 sellers between January 1, 2020 and November 20, 2021.

Findings

For visual variables, the number of shots and pixel-level image complexity were found to have nonlinear (inverted U-shaped) relationships with user engagement behavior. The vertical video form was found to have a positive effect on comments and shares. In the case of audio variables, speech rate was found to have a significant positive effect on shares but not on likes and comments. The average spectral centroid was found to have significant negative influences on likes and comments.

Practical implications

This study provides specific suggestions for sellers who create short-form videos to improve user engagement behavior.

Originality/value

This study contributes to the literature on short-form video advertising by extending the potential drivers of user engagement behavior. Additionally, from a methodological perspective, it contributes to the literature by using computer vision and speech-processing techniques to analyze user behavior in a video-related context, effectively overcoming the limitations of the widely adopted survey method.

Details

Internet Research, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1066-2243

Keywords

Access Restricted. View access options
Article
Publication date: 21 June 2021

Huizhong Zhang, Yu Zuo, Pengfei Ju, Jian Zhang, Xuhui Zhao, Yuming Tang and Xiaofeng Zhang

The purpose of this paper is to study the variations of composition and properties of the passive film on 316 L stainless steel surface in 80°C, 0.5 mol L-1 H2SO4 + 2 mg L-1 NaF…

105

Abstract

Purpose

The purpose of this paper is to study the variations of composition and properties of the passive film on 316 L stainless steel surface in 80°C, 0.5 mol L-1 H2SO4 + 2 mg L-1 NaF solution, is helpful to understand the mechanisms of corrosion resistancethe of plated Pd on 316 L ss.

Design/methodology/approach

The variations of composition and properties of the passive film on 316 L stainless steel surface in 80°C, 0.5 mol L-1 H2SO4 + 2 mg L-1 NaF solution after connected to Pd electrode were studied with methods of potential monitor, X-ray photoelectron spectroscopy analysis and electrochemical impedance spectrum (EIS) measurement.

Findings

By connecting to a Pd electrode, the potential of the SS sample increased from the active region to the passive region. By connecting to the Pd electrode, the contents of Cr, Cr(OH)3 and Fe3O4 in passive film increased obviously. With increased Pd/SS area ratio, the Cr(OH)3 content in passive film increased but the Fe3O4 content changed little. The results show that after connecting to Pd the corrosion resistance of the passive film on 316 L stainless steel increases obviously, which may be attributed to the more compact passive film because of higher Cr, Cr(OH)3 and Fe3O4 contents and less point defects in the film.

Originality/value

The effects and mechanism of Pd on passivation of SS was studied.

Details

Anti-Corrosion Methods and Materials, vol. 68 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

Access Restricted. View access options
Article
Publication date: 8 March 2011

Shinong Wu, Xiaofeng Quan and Liang Xu

The purpose of this paper is to investigate how disclosure quality affects the relation between chief executive officer (CEO) power and the variability of firm performance…

1586

Abstract

Purpose

The purpose of this paper is to investigate how disclosure quality affects the relation between chief executive officer (CEO) power and the variability of firm performance. Moreover, it also examines the impacts of ownership structure and disclosure quality on the relationship between CEO power and performance variability.

Design/methodology/approach

Empirical research was carried out.

Findings

It was found that: first, firms whose CEOs have more power will exhibit higher performance, but display more variability in firm performance. Second, disclosure quality can affect the relationship between CEO power and the variability of firm performance and more specifically, increase in disclosure quality reduces the performance variability caused by CEO power. Third, the effects of CEO power on the variability of firm performance are higher in state‐owned firms than in non‐state‐owned firms. Moreover, the effect of higher disclosure quality for lowering the variability of firm performance is stronger in state‐owned firms than in non‐state‐owned firms.

Practical implications

First, the authors find that when evaluating corporate governance practices, both firm performance and the variability of firm performance should be taken into account. Second, this paper fills the void in the extant literatures by demonstrating that CEO power, as well as disclosure quality, can affect firms' operational risk. Third, for firm owners, when firms are facing large uncertainty from institutional environment, a great trade‐off between firm performance and operational risk, when determining the degree of CEO power, will play an important role in corporate governance.

Originality/value

This paper complements the extant literatures by examining the impacts of CEO power to firm output from the dimensions of both firm performance and operational risk; and by examining the impacts of ownership structure and disclosure quality on the relationship between CEO power and performance variability.

Details

Nankai Business Review International, vol. 2 no. 1
Type: Research Article
ISSN: 2040-8749

Keywords

Access Restricted. View access options
Article
Publication date: 19 September 2018

Qing Wang, Changyin Sun, Xiaofeng Chai and Yao Yu

This paper aims to develop sliding mode control (SMC) methods for second-order multi-agent systems (MAS) in the presence of mismatched uncertainties.

359

Abstract

Purpose

This paper aims to develop sliding mode control (SMC) methods for second-order multi-agent systems (MAS) in the presence of mismatched uncertainties.

Design/methodology/approach

Based on the disturbance observer (DOB), discontinuous and continuous sliding mode protocols are designed to achieve finite-time consensus in spite of the disturbances.

Findings

Compared with integral SMC, numerical simulation results show that the proposed control methods exhibit better performance with respect to reduction of chattering.

Originality/value

The main contributions are the following: MAS described with mismatched uncertainties are considered; both discontinuous and continuous sliding mode controllers are considered; with the proposed sliding mode controller, the desired sliding surface can be reached in finite time and the DOB is introduced in the controller to alleviate the chattering phenomenon.

Access Restricted. View access options
Article
Publication date: 1 May 2009

Bao Jinsong, Hu Xiaofeng and Jin Ye

The purpose of this paper is to propose an algorithm based on genetic algorithm (GA) to solve the block erection scheduling problem in shipbuilding.

983

Abstract

Purpose

The purpose of this paper is to propose an algorithm based on genetic algorithm (GA) to solve the block erection scheduling problem in shipbuilding.

Design/methodology/approach

The block erection scheduling problem is defined as the identical parallel machine‐scheduling problem with precedence constraints and machine eligibility (PCME) restrictions. A GA is proposed to find near optimal solution, and a few lower bounds and the percentage of the reduced makespan are defined to evaluate the performance of the proposed algorithm. Finally, the GA for block erection scheduling problem in a shipyard is illustrated by using the real data from a local shipyard.

Findings

The proposed GA produces lesser values of makespan against the random heuristic algorithm for the collected real instances.

Research limitations/implications

The proposed GA can solve other similar parallel machine‐scheduling problems with PCME to minimize makespan.

Practical implications

Based on the proposed GA, the developed scheduling system for block erection in a shipyard can reduce the makespan of block erection, and contribute to the productivity improvement.

Originality/value

The allocation of block erection to the crane is modeled as a parallel machine‐scheduling problem with PCME, and the GA is developed to solve this problem to minimize makespan.

Details

Journal of Manufacturing Technology Management, vol. 20 no. 4
Type: Research Article
ISSN: 1741-038X

Keywords

Access Restricted. View access options
Article
Publication date: 11 December 2023

Jianbin Luo, Mingsen Li, Ke Mi, Zhida Liang, Xiaofeng Chen, Lei Ye, Yuanhao Tie, Song Xu, Haiguo Zhang, Guiguang Chen and Chunmei Jiang

The purpose of this paper is to study the aerodynamic characteristics of Ahmed body in longitudinal and lateral platoons under crosswind by computational fluid dynamics…

201

Abstract

Purpose

The purpose of this paper is to study the aerodynamic characteristics of Ahmed body in longitudinal and lateral platoons under crosswind by computational fluid dynamics simulation. It helps to improve the aerodynamic characteristics of vehicles by providing theoretical basis and engineering direction for the development and progress of intelligent transportation.

Design/methodology/approach

A two-car platoon model is used to compare with the experiment to prove the accuracy of the simulation method. The simplified Ahmed body model and the Reynolds Averaged N-S equation method are used to study the aerodynamic characteristics of vehicles at different distances under cross-winds.

Findings

When the longitudinal distance x/L = 0.25, the drag coefficients of the middle and trailing cars at β = 30° are improved by about 272% and 160% compared with β = 10°. The side force coefficients of the middle and trailing cars are increased by 50% and 62%. When the lateral distance y/W = 0.25, the side force coefficients of left and middle cars at β = 30° are reduced by 38% and 37.5% compared with β = 10°. However, the side force coefficient of the right car are increased by about 84.3%.

Originality/value

Most of the researches focus on the overtaking process, and there are few researches on the neat lateral platoon. The innovation of this paper is that in addition to studying the aerodynamic characteristics of longitudinal driving, the aerodynamic characteristics of neat lateral driving are also studied, and crosswind conditions are added. The authors hope to contribute to the development of intelligent transportation.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 34 no. 7
Type: Research Article
ISSN: 0961-5539

Keywords

Access Restricted. View access options
Article
Publication date: 1 October 2019

Wei-Hung Hsiao and Tsung-Sheng Chang

The logistics industry has benefited hugely from the growth of e-commerce. The logistics and transportation industry operators have realized that higher-quality service and…

1498

Abstract

Purpose

The logistics industry has benefited hugely from the growth of e-commerce. The logistics and transportation industry operators have realized that higher-quality service and logistics management provides the competitive edge as the primary channel of communication with consumers. Digital voice assistants (DVA) is an information system based on an artificial intelligence framework that can interact through voice, such that a deliveryman can query for or use information in a relatively short time. The purpose of this paper is to explore the value of DVA in logistic service.

Design/methodology/approach

This study aims to develop a framework for innovation and logistics service capabilities of logistics and transportation services to structure a model based on the analysis hierarchy process method to discuss the factors considered when adopting DVA.

Findings

The results of this study implied that common problem and expectations of current operators in the delivery of goods and their expectations of DVA.

Practical implications

Innovative operations and planning are possible with information technology-enabled logistic services. It is important to identify relevant DVA development avenues.

Originality/value

The purpose of this study is to show which factors are significant to the logistics and transportation industry using DVA to aid the deliverymen, and it provides guidance for manager evaluating adopted DVA and its object.

Details

Journal of Enterprise Information Management, vol. 32 no. 6
Type: Research Article
ISSN: 1741-0398

Keywords

1 – 10 of 40
Per page
102050