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1 – 10 of over 1000
Article
Publication date: 5 June 2019

Gang Li, Shuo Jia and Hong-Nan Li

The purpose of this paper is to make a theoretical comprehensive efficiency evaluation of a nonlinear analysis method based on the Woodbury formula from the efficiency of…

Abstract

Purpose

The purpose of this paper is to make a theoretical comprehensive efficiency evaluation of a nonlinear analysis method based on the Woodbury formula from the efficiency of the solution of linear equations in each incremental step and the selected iterative algorithms.

Design/methodology/approach

First, this study employs the time complexity theory to quantitatively compare the efficiency of the Woodbury formula and the LDLT factorization method which is a commonly used method to solve linear equations. Moreover, the performance of iterative algorithms also significantly effects the efficiency of the analysis. Thus, the three-point method with a convergence order of eight is employed to solve the equilibrium equations of the nonlinear analysis method based on the Woodbury formula, aiming to improve the iterative performance of the Newton–Raphson (N–R) method.

Findings

First, the result shows that the asymptotic time complexity of the Woodbury formula is much lower than that of the LDLT factorization method when the number of inelastic degrees of freedom (IDOFs) is much less than that of DOFs, indicating that the Woodbury formula is more efficient for local nonlinear problems. Moreover, the time complexity comparison of the N–R method and the three-point method indicates that the three-point method is more efficient than the N–R method for local nonlinear problems with large-scale structures or a larger ratio of IDOFs number to the DOFs number.

Originality/value

This study theoretically evaluates the efficiency of nonlinear analysis method based on the Woodbury formula, and quantitatively shows the application condition of the comparative methods. The comparison result provides a theoretical basis for the selection of algorithms for different nonlinear problems.

Details

Engineering Computations, vol. 36 no. 4
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 22 November 2021

Nan Li

This paper aims to strengthen the cultural communication and educational function of the library, bringing newspirits and vitality into the development of the librarianship.

Abstract

Purpose

This paper aims to strengthen the cultural communication and educational function of the library, bringing newspirits and vitality into the development of the librarianship.

Design/methodology/approach

In this paper, the practical research on the living book service in university libraries has given concrete cases, the existing problems are analyzed in detail and some suggestions for improvement are extracted when putting forward, which can be used as the reference and be corrected by colleagues and related scholars in the same field.

Findings

There have been many research results on the topic of living book service, but there are few ones with promotional function. Living book service not only satisfies the readers' curiosity and enables them to obtain knowledge and experience they need, but also establishes a good relationship of communication and understanding between “Real Person Books” and readers. It resonates by face-to-face discussion of different life experiences, living experiences or beliefs, and it is also an innovation of the traditional library service mode.

Originality/value

Brand activities are taken as examples, and some thoughts and enlightenment on the living book service in the university library are put forward, helping us to better understand and evaluate the library activities.

Open Access
Article
Publication date: 13 December 2019

Nan Li and Liu Yuanchun

The purpose of this paper is to summarize different methods of constructing the financial conditions index (FCI) and analyze current studies on constructing FCI for China…

Abstract

Purpose

The purpose of this paper is to summarize different methods of constructing the financial conditions index (FCI) and analyze current studies on constructing FCI for China. Due to shifts of China’s financial mechanisms in the post-crisis era, conventional ways of FCI construction have their limitations.

Design/methodology/approach

The paper suggests improvements in two aspects, i.e. using time-varying weights and introducing non-financial variables. In the empirical study, the author first develops an FCI with fixed weights for comparison, constructs a post-crisis FCI based on time-varying parameter vector autoregressive model and finally examines the FCI with time-varying weights concerning its explanatory and predictive power for inflation.

Findings

Results suggest that the FCI with time-varying weights performs better than one with fixed weights and the former better reflects China’s financial conditions. Furthermore, introduction of credit availability improves the FCI.

Originality/value

FCI constructed in this paper goes ahead of inflation by about 11 months, and it has strong explanatory and predictive power for inflation. Constructing an appropriate FCI is important for improving the effectiveness and predictive power of the post-crisis monetary policy and foe achieving both economic and financial stability.

Details

China Political Economy, vol. 2 no. 2
Type: Research Article
ISSN: 2516-1652

Keywords

Article
Publication date: 1 September 2017

Nan Li

Many of the original buildings have gradually declined because of the development of society and the adjustment of industrial structure. Protecting the classical…

Abstract

Many of the original buildings have gradually declined because of the development of society and the adjustment of industrial structure. Protecting the classical architecture and restoring the original luster of a building to maintain its own youth has become a hot issue in the current architectural planning. In this paper, the performance of the core idea of building conservation in the specific design and planning was discussed through the in-depth understanding of William Sumner Appleton's architectural concept in building protection planning area. Moreover, the profound influence of the idea of building conservation in building conservation was summarized. The current pace of urbanization development process is rapid, thus, many of the original buildings are severely damaged because of many factors. The concept and thought of William Sumner Appleton were re-interpreted based on the design and planning method of World Expo industrial clusters in Shanghai. This study is of great significance for the promotion of historical building protection and concrete practice in our country.

Details

Open House International, vol. 42 no. 3
Type: Research Article
ISSN: 0168-2601

Keywords

Article
Publication date: 11 January 2016

Jiuying Dong and Shuping Wan

The triangular intuitionistic fuzzy number (TIFN) is very useful for expressing ill-known quantity. The purpose of this paper is to develop a new method for…

Abstract

Purpose

The triangular intuitionistic fuzzy number (TIFN) is very useful for expressing ill-known quantity. The purpose of this paper is to develop a new method for multi-attribute group decision-making (MAGDM) problems, in which the attribute values are the TIFNs, the attribute weights are completely unknown and the weights of decision makers are given by linguistic variables.

Design/methodology/approach

A new method is given to rank TIFNs based on the weighted possibility mean and standard deviation of TIFNs. The weighted Minkowski distance of TIFNs is defined by using the weighted lower and upper possibility means of TIFNs. The weights of experts are determined in terms of the voting model of intuitionistic fuzzy set (IFS). The weights of attributes can be objectively determined through utilizing the information entropy defined by weighted Minkowski distance of TIFNs. Through integrating the attribute weights and expert weights, the collective comprehensive ranking values of alternatives are obtained and used to rank the alternatives.

Findings

The stock selection example and comparison analysis show the validity and applicability of the method proposed in this paper.

Originality/value

The paper presents a new ranking method of TIFNs and defines the weighted Minkowski distance of TIFNs. The weights of experts are determined in terms of the voting model of IFS. The weights of attributes can be objectively determined through utilizing the information entropy. The proposed method can greatly enhance the flexibility and agility of decision-making process.

Article
Publication date: 3 October 2016

Jiajie Li, Nan Li, Lang Luo and Yanan Ren

The purpose of this paper is to investigate risk dimensions affecting food risk perceptions and to develop effective risk communication strategies based on their risk…

Abstract

Purpose

The purpose of this paper is to investigate risk dimensions affecting food risk perceptions and to develop effective risk communication strategies based on their risk perceptions dimensions. The reason for writing this paper is that applying single risk communication strategy for public often fails because food risks are systemic risks and public perceptions toward them consist of multiple dimensions. Launching an effective risk communication need to investigate the perception dimensions of the target audience.

Design/methodology/approach

A total of 2,673 parents of 3-14-year-old children from the rural area of Sichuan province in China were chosen as target audience. Based on the survey conducted about parents’ food risk perceptions, this study used factor-cluster analysis method to segment parents to sub-clusters with significantly different risk perception dimensions. Parents’ representative demographic characteristics within each cluster were further identified through cross-tabs analysis with χ2 tests.

Findings

All the parents could be segmented into four sub-clusters, namely, sensitive parents, dependent parents, familiarity-oriented parents and institutional distrust parents, according to their risk perception difference on five dimensions. A series of risk communication strategies were specifically designed for each cluster based on their risk perception features as well as demographic characteristics.

Originality/value

The insight derived from this study described a deeper image of public risk perceptions and provided suggestions for risk communication launchers to pinpoint the risk perception as well as perception dimensions of the target audience and accordingly develop effective risk communication strategies.

Details

British Food Journal, vol. 118 no. 10
Type: Research Article
ISSN: 0007-070X

Keywords

Article
Publication date: 15 January 2019

Juanqiong Gou, Nan Li, Tete Lyu, Xiyan Lyu and Zuopeng Zhang

As the dynamics of the external environment of the enterprise continue to increase, the support of information systems for organizational agility becomes increasingly…

Abstract

Purpose

As the dynamics of the external environment of the enterprise continue to increase, the support of information systems for organizational agility becomes increasingly important. Collaborative Management System (CMS) is a new type of information system that can cope with the dynamic changes of the organization. Effective knowledge transfer is the core of the system implementation. The purpose of this study is to explore the knowledge transfer barriers faced by CMS in its implementation process.

Design/methodology/approach

Through field interviews with a representative CMS provider, this paper summarizes the barriers of knowledge transfer during CMS implementation into three aspects.

Findings

Based on the innovative measures taken by the company and relevant literature, the corresponding mitigating strategies are proposed.

Originality/value

The findings enrich the implementation methodology of agile information systems by exploring the knowledge transfer problem from a novel context. The study also provides a reference for practical implementation to overcome the dilemma of knowledge transfer.

Details

VINE Journal of Information and Knowledge Management Systems, vol. 49 no. 1
Type: Research Article
ISSN: 2059-5891

Keywords

Article
Publication date: 16 August 2022

Nan Li, Muzi Chen, Haoyu Gao, Difang Huang and Xiaoguang Yang

Given the scarcity of data during the early stages of the COVID-19 pandemic in China, the decision-making for non-pharmaceutical policies was mostly based on insufficient…

Abstract

Purpose

Given the scarcity of data during the early stages of the COVID-19 pandemic in China, the decision-making for non-pharmaceutical policies was mostly based on insufficient evidence. The purpose of this study is to assess the effectiveness of these policies, such as lockdown and government subsidies, on rural households and identify policy implications for China and other countries in dealing with pandemics.

Design/methodology/approach

The authors survey 2,408 rural households by telephone from 101 counties across 17 provinces in China during the first stage of the pandemic (March 2020). The authors use the ordered probit model and linear regression model to study the overall impact of policies and then use the quantile regression model and sub-sample regression method to study the heterogeneity of the effects of government policies.

Findings

The authors find that logistics disruption due to lockdown negatively affected rural households. Obstructed logistics is associated with a more significant loss for high-income households, while its impact on the loss expectation of low-income households is more severe. Breeding and other industries such as transport and sales suffer more from logistics than cultivation. The impact of logistics on intensive agricultural entities is more serious than that on professional farms. The government subsidy is more effective at reducing loss for low-income households. Lockdown and government subsidies have shown heterogeneous impacts on rural households.

Practical implications

The overall economic losses experienced by rural households in the early stages of the pandemic are controllable. The government policies of logistics and subsidies should target specific groups.

Originality/value

The authors evaluate the economic impacts of lockdown and government subsidies on rural households and show their heterogeneity among different groups. The authors further demonstrate the policy effectiveness in supporting rural households during the early stages of the pandemic and provide future policy guidance on major public health event.

Details

China Agricultural Economic Review, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1756-137X

Keywords

Article
Publication date: 19 June 2017

Xiaochun Tian, Jiabin Chen, Yongqiang Han, Jianyu Shang and Nan Li

This study aims to design an optimized algorithm for low-cost pedestrian navigation system (PNS) to correct the heading drift and altitude error, thus achieving…

Abstract

Purpose

This study aims to design an optimized algorithm for low-cost pedestrian navigation system (PNS) to correct the heading drift and altitude error, thus achieving high-precise pedestrian location in both two-dimensional (2-D) and three-dimensional (3-D) space.

Design/methodology/approach

A novel heading correction algorithm based on smoothing filter at the terminal of zero velocity interval (ZVI) is proposed in the paper. This algorithm adopts the magnetic sensor to calculate all the heading angles in the ZVI and then applies a smoothing filter to obtain the optimal heading angle. Furthermore, heading correction is executed at the terminal moment of ZVI. Meanwhile, an altitude correction algorithm based on step height constraint is proposed to suppress the altitude channel divergence of strapdown inertial navigation system by using the step height as the measurement of the Kalman filter.

Findings

The verification experiments were carried out in 2-D and 3-D space to evaluate the performance of the proposed pedestrian navigation algorithm. The results show that the heading drift and altitude error were well corrected. Meanwhile, the path calculated by the novel algorithm has a higher match degree with the reference trajectory, and the positioning errors of the 2-D and 3-D trajectories are both less than 0.5 per cent.

Originality/value

Besides zero velocity update, another two problems, namely, heading drift and altitude error in the PNS, are solved, which ensures the high positioning precision of pedestrian in indoor and outdoor environments.

Article
Publication date: 1 October 2003

Chun‐Che Huang and Chia‐Ming Kuo

Knowledge is perceived as very important asset for organizations and knowledge management is critical for organization competitiveness. Because the nature of knowledge is…

1687

Abstract

Knowledge is perceived as very important asset for organizations and knowledge management is critical for organization competitiveness. Because the nature of knowledge is always represented as complex and varied, it is difficult to extend effectiveness of knowledge re‐use in organizations. In this article, an approach based on the Zachman’s Framework to externalize organizational knowledge into semi‐structured knowledge is developed, and eXtensible Markup Language (XML) is applied to transform the knowledge into documents. In addition, latent semantic indexing (LSI), which is capable of solving problems of synonyms and antonyms, as well as improving accuracy of document searches, is incorporated to facilitate search of semi‐structured knowledge (SSK) documents based on user demands. The SSK approach shows great promise for organizations to acquire, store, disseminate, and reuse knowledge.

Details

Journal of Knowledge Management, vol. 7 no. 4
Type: Research Article
ISSN: 1367-3270

Keywords

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