Qinan Luo and Haibin Duan
Artificial bee colony (ABC) algorithm is a relatively new optimization method inspired by the herd behavior of honey bees, which shows quite intelligence. The purpose of this…
Abstract
Purpose
Artificial bee colony (ABC) algorithm is a relatively new optimization method inspired by the herd behavior of honey bees, which shows quite intelligence. The purpose of this paper is to propose an improved ABC optimization algorithm based on chaos theory for solving the push recovery problem of a quadruped robot, which can tune the controller parameters based on its search mechanism. ADAMS simulation environment is adopted to implement the proposed scheme for the quadruped robot.
Design/methodology/approach
Maintaining balance is a rather complicated global optimum problem for a quadruped robot which is about seeking a foot contact point prevents itself from falling down. To ensure the stability of the intelligent robot control system, the intelligent optimization method is employed. The proposed chaotic artificial bee colony (CABC) algorithm is based on basic ABC, and a chaotic mechanism is used to help the algorithm to jump out of the local optimum as well as finding the optimal parameters. The implementation procedure of our proposed chaotic ABC approach is described in detail.
Findings
The proposed CABC method is applied to a quadruped robot in ADAMS simulator. Using the CABC to implement, the quadruped robot can work smoothly under the interference. A comparison among the basic ABC and CABC is made. Experimental results verify a better trajectory tracking response can be achieved by the proposed CABC method after control parameters training.
Practical implications
The proposed CABC algorithm can be easily applied to practice and can steer the robot during walking, which will considerably increase the autonomy of the robot.
Originality/value
The proposed CABC approach is interesting for the optimization of a control scheme for quadruped robot. A parameter training methodology, using the presented intelligent algorithm is proposed to increase the learning capability. The experimental results verify the system stabilization, favorable performance and no chattering phenomena can be achieved by using the proposed CABC algorithm. And, the proposed CABC methodology can be easily extended to other applications.
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Qinan Luo and Haibin Duan
– The purpose of this paper is to propose an approach for aircraft taking off control in wind shear, which is a challenging issue for an aircraft.
Abstract
Purpose
The purpose of this paper is to propose an approach for aircraft taking off control in wind shear, which is a challenging issue for an aircraft.
Design/methodology/approach
Aircraft control in wind shear needs an anti-jamming controller. Symbolic control is an effective and adaptive method for complex dynamic system. In this paper, wind shear flight control laws are developed for the dynamics of a B-747 aircraft by using symbolic control. The problem of efficiently steering dynamical systems with disturbance by using symbolic control is considered, and theoretical analysis on the proposed approach is also conducted. The implementation of an altitude scheduling strategy with symbolic controller makes it possible for aircraft to escape serious wind shear.
Findings
This work improved symbolic control algorithm so that it can be applied to aircraft control problem. A series of comparative experimental results with proportional-integral-derivative controller demonstrate the feasibility and effectiveness of the proposed approach.
Practical implications
The symbolic control method developed in this paper can be easily applied to another aircraft control problems.
Originality/value
An improved symbolic control method is proposed for solving aircraft taking off problem in wind shear.
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Hongyan Liu, Hao Xue, Yaojiang Shi and Scott Rozelle
Low levels of human capital in rural China are rooted in the poor schooling outcomes of elementary school students. The purpose of this paper is to provide insight into the…
Abstract
Purpose
Low levels of human capital in rural China are rooted in the poor schooling outcomes of elementary school students. The purpose of this paper is to provide insight into the distribution of academic performance in rural China and identify vulnerable groups.
Design/methodology/approach
The authors draw on a data set of 25,892 observations constructed from 11 school-level surveys spanning nine provinces and one municipality in China conducted from 2013 to 2015.
Findings
The authors find that the distribution of academic performance is uneven across provinces and subgroups. In general, male students, Han, living in richer counties, living with their parents and studying in rural public schools do better academically than female students, non-Han, living in poorer counties, left behind and studying in private migrant schools in cities.
Research limitations/implications
Using the results of this study, policymakers should be able to better target investments into rural education focusing on at risk subpopulations.
Originality/value
With limited data sources, the research on the academic performance of students in rural China is largely absent. The findings of this study help to fill the gaps in the literature base.
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The sublime in scent refers to the use of language and description that excites thoughts and emotions beyond ordinary olfactory experience, and I would like to borrow this…
Abstract
Purpose
The sublime in scent refers to the use of language and description that excites thoughts and emotions beyond ordinary olfactory experience, and I would like to borrow this literary concept to explore the recent development of incense traditions in Japan and China from a sociocultural perspective. In order to understand how olfactory characters of incense have been verbally expressed, we can start by looking into the sublime in scent through the articulation of relevant subtle approaches since ancient times.
Design/methodology/approach
This paper explains how the description of scent experienced by individuals has been associated with thoughts and history and why the sublime in scent is more complicated than the aroma people can tell. The data collected for this research is mostly based on observations by participating in various events and conversations with different people.
Findings
In Japan and China, the use of incense has a long history, and relevant scent cultures have been developed not only for offerings in religious practices, but also as a kind of scent appreciation together with a poetic presentation. Again, it is important and significant to discern several interactions of incense traditions in these two countries, since the transformations became obvious in the last two decades, while Japanese Kodo participated more in international exchange, and the Chinese people's view of intangible cultural heritage has become more important in their daily social practices.
Originality/value
As a way of showing how the study of scent can enhance ethnographic writing and the understanding of changes in the appreciation of incense, this paper hopes to contribute to the study of art and tradition.