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Article
Publication date: 7 August 2017

Du Lin, Bo Shen, Yurong Liu, Fuad E. Alsaadi and Ahmed Alsaedi

The purpose of this paper is to improve the performance of the genetic algorithm-based compliant robot path planning (GACRPP) in complex dynamic environment by proposing…

Abstract

Purpose

The purpose of this paper is to improve the performance of the genetic algorithm-based compliant robot path planning (GACRPP) in complex dynamic environment by proposing an improved bidirectional rapidly exploring random tree (Bi-RRT)-based population initialization method.

Design/methodology/approach

To achieve GACRPP in complex dynamic environment with high performance, an improved Bi-RRT-based population initialization method is proposed. First, the grid model is adopted to preprocess the working space of mobile robot. Second, an improved Bi-RRT is proposed to create multi-cluster connections between the starting point and the goal point. Third, the backtracking method is used to generate the initial population based on the multi-cluster connections generated by the improved Bi-RRT. Subsequently, some comparative experiments are implemented where the performances of the improved Bi-RRT-based population initialization method are compared with other population initialization methods, and the comparison results of the improved genetic algorithm (IGA) combining with the different population initialization methods are shown. Finally, the optimal path is further smoothed with the help of the technique of quadratic B-spline curves.

Findings

It is shown in the experiment results that the improved Bi-RRT-based population initialization method is capable of deriving a more diversified initial population with less execution time and the IGA combining with the proposed population initialization method outperforms the one with other population initialization methods in terms of the length of optimal path and the execution time.

Originality/value

In this paper, the Bi-RRT is introduced as a population initialization method into the GACRPP problem. An improved Bi-RRT is proposed for the purpose of increasing the diversity of initial population. To characterize the diversity of initial population, a new notion of breadth is defined in terms of Hausdorff distance between different paths.

Details

Assembly Automation, vol. 37 no. 3
Type: Research Article
ISSN: 0144-5154

Keywords

Content available
Article
Publication date: 4 April 2016

Bo Shen

306

Abstract

Details

Assembly Automation, vol. 36 no. 2
Type: Research Article
ISSN: 0144-5154

Article
Publication date: 5 February 2018

Xiao-qiang Jiao, Gang He, Zhen-ling Cui, Jian-bo Shen and Fu-suo Zhang

The purpose of this paper is to analyze the historical pattern of environmental cost due to grain production in China and to provide further implications of technologies…

1138

Abstract

Purpose

The purpose of this paper is to analyze the historical pattern of environmental cost due to grain production in China and to provide further implications of technologies and policies for the transformation of China’s agricultural development toward sustainable intensification.

Design/methodology/approach

The data sets about grain production, arable land and chemical fertilizer use in China were collected from FAO, NBSC, and IFA. Greenhouse gas emissions were estimated using life cycle assessments. The policies concerning grain production and the environment were collected from the Ministry of Agriculture, and the State Council of China.

Findings

China has produced enough food to feed its growing population, but has neglected the resource-environmental costs of grain production since 1978. Consequently, China’s grain production is always accompanied with a high cost of resource and environment sustainability. However, from 2006 to 2015, the growth rate of grain production has surpassed that of chemical fertilizer consumption, resulting in improvement in nutrient use efficiency and decreasing trends of environmental cost for grain production. This could be partially attributed to technology innovations, such as Soil-Testing and Fertilizer-Recommendations (STFR), soil quality and crop management improvement, and so on, and policy supports (policies of STFR, soil quality improvement, and high-yield construction). This indicated that China’s grain production is starting to transform from high-input and high-output model to “less for more.”

Originality/value

This study is the first to determine the detailed, historical role of technological innovation and agri-environmental policy on the sustainability of grain production in China. The findings should have significant implications for technology and policy for the transformation of China’s agriculture development to sustainable intensification.

Details

China Agricultural Economic Review, vol. 10 no. 1
Type: Research Article
ISSN: 1756-137X

Keywords

Article
Publication date: 4 April 2016

Fowei Wang, Bo Shen, Shaoyuan Sun and Zidong Wang

The purpose of this paper is to improve the accuracy of the facial expression recognition by using genetic algorithm (GA) with an appropriate fitness evaluation function…

Abstract

Purpose

The purpose of this paper is to improve the accuracy of the facial expression recognition by using genetic algorithm (GA) with an appropriate fitness evaluation function and Pareto optimization model with two new objective functions.

Design/methodology/approach

To achieve facial expression recognition with high accuracy, the Haar-like features representation approach and the bilateral filter are first used to preprocess the facial image. Second, the uniform local Gabor binary patterns are used to extract the facial feature so as to reduce the feature dimension. Third, an improved GA and Pareto optimization approach are used to select the optimal significant features. Fourth, the random forest classifier is chosen to achieve the feature classification. Subsequently, some comparative experiments are implemented. Finally, the conclusion is drawn and some future research topics are pointed out.

Findings

The experiment results show that the proposed facial expression recognition algorithm outperforms ones in the existing literature in terms of both the actuary and computational time.

Originality/value

The GA and Pareto optimization algorithm are combined to select the optimal significant feature. To improve the accuracy of the facial expression recognition, the GA is improved by adjusting an appropriate fitness evaluation function, and a new Pareto optimization model is proposed that contains two objective functions indicating the achievements in minimizing within-class variations and in maximizing between-class variations.

Details

Assembly Automation, vol. 36 no. 2
Type: Research Article
ISSN: 0144-5154

Keywords

Article
Publication date: 27 March 2020

Yu hui Fan, Pan pan Liu, Bo Shen, Kejian Ma, Bang Wu, Tianhong Zheng and Fang Yang

The reinforced concrete open-web sandwich slab is composed of upper rib, lower rib, surface plate and shear key and was applied to long-span structure crossing at 18–30 m…

Abstract

Purpose

The reinforced concrete open-web sandwich slab is composed of upper rib, lower rib, surface plate and shear key and was applied to long-span structure crossing at 18–30 m. The shear-bearing capacity of shear key, having vital effects on the slab’s bearing capacity, is analysed to present its calculation formula used for the engineering application of the slab.

Design/methodology/approach

The shear-bearing capacity of shear key is analysed by the strut-and-tie model and the benchmark model established by the finite element method. Furthermore, the design formula of its shear capacity is given by the parametric analysis of FEM to adjust the result of the strut-and-tie model, using multivariate linear regression analysis of these parameters.

Findings

The calculation result of the benchmark model is compared with those of the strut-and-tie model and the standard formula, which indicates that the result of the strut-and-tie model is closer to that of the benchmark model than that of the standard formula. Moreover, the parametric analysis of the finite element model indicates that the volume–stirrup ratio of the shear key and the compression strength of the concrete have lesser effect on the shear capacity compared with the longitudinal reinforcement ratio and the shear-to-span ratio of the shear key and the relative section height of the rib.

Originality/value

The shear capacity of the shear key is provided in the paper by combining the finite element method and the strut-and-tie model, which is different from the calculation of the shear key in local codes and Chinese code, based on the theory of short corbel and the experiment of member. Furthermore, the formula of the shear capacity could be employed in the design and construction of the RC open-web sandwich slab, mainly used in the public and industrial multi-story building with long span to save the dwindling land resource currently.

Details

International Journal of Structural Integrity, vol. 12 no. 2
Type: Research Article
ISSN: 1757-9864

Keywords

Article
Publication date: 7 July 2020

Qingqing Zhou and Ming Jing

The suddenness, urgency and social publicity of emergency events lead to great impacts on public life. The deep analysis of emergency events can provide detailed and…

Abstract

Purpose

The suddenness, urgency and social publicity of emergency events lead to great impacts on public life. The deep analysis of emergency events can provide detailed and comprehensive information for the public to get trends of events timely. With the development of social media, users prefer to express opinions on emergency events online. Thus, massive public opinion information of emergencies has been generated. Hence, this paper aims to conduct multidimensional mining on emergency events based on user-generated contents, so as to obtain finer-grained results.

Design/methodology/approach

This paper conducted public opinion analysis via fine-grained mining. Specifically, public opinion about an emergency event was collected as experimental data. Secondly, opinion mining was conducted to get users’ opinion polarities. Meanwhile, users’ information was analysed to identify impacts of users’ characteristics on public opinion.

Findings

The experimental results indicate that public opinion is mainly negative in emergencies. Meanwhile, users in developed regions are more active in expressing opinions. In addition, male users, especially male users with high influence, are more rational in public opinion expression.

Originality/value

To the best of the authors’ knowledge, this is the first research to identify public opinion in emergency events from multiple dimensions, which can get in-detail differences of users’ online expression.

Details

The Electronic Library , vol. 38 no. 3
Type: Research Article
ISSN: 0264-0473

Keywords

Article
Publication date: 2 April 2021

Rola Chami-Malaeb

The purpose of this paper is to study the effect of two positive organizational factors: the perceived supervisor support (PSS) and the self-efficacy (SE) on nurses'…

Abstract

Purpose

The purpose of this paper is to study the effect of two positive organizational factors: the perceived supervisor support (PSS) and the self-efficacy (SE) on nurses' burnout (BO), which concurrently affect the turnover intention (TI) and the mediating role of BO in this relationship.

Design/methodology/approach

A cross-sectional survey-based study of a sample of 552 Lebanese registered nurses from 19 Lebanese hospitals was conducted.

Findings

The authors’ findings confirm that PSS and SE both reduce the level of BO and the turnover intention significantly. The higher the perceived supervisors' support and the nurses' SE, the less they experience BO. BO has partially mediated the relationship of the PSS and SE on TI. This study reveals that supervisors' support is well perceived by Lebanese nurses, whose s is relatively high, while their levels of BO are considered moderate. However, BO levels vary proportionally with demographic variables, namely age, work experience, gender, marital status and education.

Originality/value

This study provides new evidence on the relationship between PSS, SE and BO and turnover intention of Lebanese nurses. It is unique in studying the role of nurses' SE with regard to BO and TI and improving the quality of nurses' work life. It shows the significance of the supervisors' role in supporting the psychological state of nurses. The context of the study, Lebanon, is also novel as it differs from advanced economies institutionally, culturally and in legal frameworks that govern the employee–supervisor relationships.

Article
Publication date: 9 November 2015

Simona D'Antone and Dwight Merunka

The purpose of this paper is to explore how brand origin (BO) cues affect the consumer’s association of a new brand with BO learning and the subsequent effects on brand…

1927

Abstract

Purpose

The purpose of this paper is to explore how brand origin (BO) cues affect the consumer’s association of a new brand with BO learning and the subsequent effects on brand image (BO semiotics). An integrative theoretical framework is proposed that includes both processes.

Design/methodology/approach

The proposed model is based on analogical learning theory and triadic semiotic theory.

Findings

Two types of BO knowledge form BO meanings in consumer minds: country-related categories and exemplar brands, which have a classification and/or inferential role. The brand cues (indexes or icons) used by consumers to identify BO generate one or the other type of BO knowledge. Indexes trigger the classification function of country-related categories while icons trigger the inferential role of country-related categories and exemplar brands. BO knowledge informs the meaning transfer when consumers interpret the meaning of a new brand, leading to either a transfer of relations or a transfer of attributes to the new brand.

Practical implications

Marketers should monitor BO exemplar brands that consumers use as meaning sources and carefully select the signs used in their communications to evoke BO.

Originality/value

The proposed framework contrasts with dominant categorisation perspectives, re-establishing the dual role of categories and emphasising the relevance of brand cues in BO identification and BO exemplar brands in the BO meaning transfer process. A meaning-centred perspective is adopted to integrate BO identification and the related transfer mechanisms.

Details

International Marketing Review, vol. 32 no. 6
Type: Research Article
ISSN: 0265-1335

Keywords

Open Access
Article
Publication date: 30 September 2022

Ye Shen, Bo Li, Wei Tian, Jinjun Duan and Mingxuan Liu

With the increasing requirements for intelligence in the field of aviation manufacturing, manual assembly can hardly adapt to the trend of future production. The purpose…

Abstract

Purpose

With the increasing requirements for intelligence in the field of aviation manufacturing, manual assembly can hardly adapt to the trend of future production. The purpose of this study is to realize the semi-automatic assembly of the movable airfoil by proposing a human-robot collaborative assembly strategy based on adaptive admittance control.

Design/methodology/approach

A logical judgment system for operating intentions is introduced in terms of different situations of the movements; hence, a human cognition-based adaptive admittance control method is developed to curb the damage of inertia; then virtual limit walls are raised on the periphery of the control model to ensure safety; finally, simulated and experimental comparisons with other admittance control methods are conducted to validate the proposed method.

Findings

The proposed method can save at least 28.8% of the time in the stopping phase which effectively compensates for inertia during the assembly process and has high robustness concerning data disturbances.

Originality/value

Due to the human-robot collaboration to achieve compliant assembly of movable airfoils can preserve human subjectivity while overcoming the physical limits of humans, which is of great significance to the investigation of intelligent aircraft assembly, the proposed method that reflects the user's naturalness and intuitiveness can not only enhance the stability and the flexibility of the manipulation, but also contribute to applications of industrial robots in the field of human-robot collaboration.

Details

Journal of Intelligent Manufacturing and Special Equipment, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2633-6596

Keywords

Article
Publication date: 16 September 2022

Andrei Panibratov, Olga Garanina, Abdul-Kadir Ameyaw and Amit Anand

The authors revisit the traditional OLI paradigm with the objective to allocate politics within the set of internationalization advantages by building on the political…

Abstract

Purpose

The authors revisit the traditional OLI paradigm with the objective to allocate politics within the set of internationalization advantages by building on the political strategy literature. The authors outline the specific role of political advantage that facilitates and propels the international expansion of state-owned multinational enterprises (SOMNEs) from emerging markets.

Design/methodology/approach

A conceptual paper which explains the role of political advantage in the internationalization of SOMNEs. The authors expand the scope of the OLI to capture the impact of firms' home governments' policies and relationships with host countries which are leveraged by SOMNEs in their internationalization.

Findings

The authors define political advantage as a new type of advantage which depends on and is sourced from external actors. The authors argue that P-advantage is a multifaceted and unstable part of POLI composition, which is contingent on political shifts and may be leveraged by various firms. The authors also assert that political capabilities have limitations in sustaining political advantage, which may be compensated via enhancing the political activity of firms.

Originality/value

The authors conceptualize the POLI-advantages paradigm for the internationalization of SOMNEs by proposing that in addition to the traditional ownership, location, and internalization advantages, firms can capitalize on their political advantage to enter markets where internationalization might have been difficult without their political connections.

Details

International Journal of Emerging Markets, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1746-8809

Keywords

1 – 10 of 357