Search results

With the booming development of computer, optical and sensing technologies and cybernetics, the technical research in unmanned vehicle has been advanced to a new era. This trend arouses great interest in simultaneous localization and mapping (SLAM). Especially, light detection and ranging (Lidar)-based SLAM system has the characteristics of high measuring accuracy and insensitivity to illumination conditions, which has been widely used in industry. However, SLAM has some intractable problems, including degradation under less structured or uncontrived environment. To solve this problem, this paper aims to propose an adaptive scheme with dynamic threshold to mitigate degradation.

We propose an adaptive strategy with a dynamic module is proposed to overcome degradation of point cloud. Besides, a distortion correction process is presented in the local map to reduce the impact of noise in the iterative optimization process. Our solution ensures adaptability to environmental changes.

Experimental results on both public data set and field tests demonstrated that the algorithm is robust and self-adaptive, which achieved higher localization accuracy and lower mapping error compared with existing methods.

Unlike other popular algorithms, we do not rely on multi-sensor fusion to improve the localization accuracy. Instead, the pure Lidar-based method with dynamic threshold and distortion correction module indeed improved the accuracy and robustness in localization results.

Three-dimensional (3D) food printing is an innovative technology used to customize food products through the integration of digital technology and food ingredients. The purpose of this study is to assess the current state of research in the field of 3D food printing, identify trending topics and identify promising future research directions.

This bibliometric review systematically evaluates the field of 3D food printing using data from published literature in the Web of Science database. After reference screening, 812 articles were included in the analysis.

The result reveals that research in 3D food printing primarily focuses on the optimization and characterization of mechanical and rheological properties of food inks and that post-printing processing, such as laser treatment, has emerged recently as an important consideration in 3D food printing. However, extant works lack animal and human studies that demonstrate the functionality of 3D-printed food.

This sophisticated bibliometric analysis uncovered the most studied current research topics and the leading figures in the area of 3D food printing, providing promising future research directions.

People usually try to avoid uncertainty. Recently, however, uncertainty has become an emerging marketing tool in the hedonic product industry. In the case of blind box consumption, for example, the consumers become addicted to the uncertainty created by businesses, leading to repeat purchases and even indulgences. Previous research has, yet, to focus on the impact of uncertainty on indulgence and the role of emotions.

This paper constructs and validates a chain mediation model of uncertainty triggering indulgent consumption based on the information gap theory, positive emotion theory and uncertainty resolution theory and examines the difference between resolved and unresolved uncertainty. This study also explores differences in the impact of whether uncertainty is resolved on emotions. The uncertainty-resolved group elicited a more positive emotional response than the uncertainty-unresolved group, leading to a more indulgent consumption.

The results of three studies show that uncertainty influences indulgent consumption through curiosity and positive emotion, and that curiosity and positive emotion play separate and chain mediating roles between uncertainty and indulgent consumption, respectively. We validate our central hypothesis with questionnaires among blind box consumer groups, examining the moderating role of perceived luck and risk preferences.

The findings shed new light on firms' use of uncertainty to promote consumer purchases.

Improving audit quality is an important research area of managerial accounting. This study focuses on the informal institutions within organizations and their impact on audit quality. Specifically, this study aims to examine the impact of the informal hierarchy among directors on audit quality.

The authors examine Chinese companies with listed shares from 2008 to 2020. The authors proxy for audit quality using discretionary accruals and small profits, and use ordinary least squares regression to test their hypotheses.

The results demonstrate that the informal hierarchy of the board improves audit quality. The results are robust to a battery of sensitivity analyses. Additionally, there is weak evidence that the effect of the board’s informal hierarchy on audit quality is weaker in state-owned enterprises. Moreover, the mechanism tests indicate that the board’s informal hierarchy improves audit quality through the improvement of internal controls. In addition, the impact of the informal hierarchy among directors on audit quality further improves firm performance. However, audit fees are not reduced further because the board’s informal hierarchy demands higher audit quality by choosing industry audit experts.

This study not only enriches the research on the economic consequences of the board’s informal hierarchy but also expands on studies on antecedents of audit quality.

The purpose of this paper is to examine the push and pull factors associated with the consumption of Chinese Table Tennis Super League (CTTSL) game events by online audiences and on-site attendants.

Conducting a comprehensive review of literature and a test of content validity, a questionnaire was formulated to assess push and pull motives, event consumption, and sociodemographic variables. A total of 433 CTTSL event consumers, including 225 respondents who primarily followed CTTSL game events via television and webcasting and 208 respondents who primarily consumed the events by attending live game events.

Structural equation modeling analyses revealed that for online consumers, two push factors, self-esteem and drama excitement, were found to be positively related to the event consumption factors; whereas, social interaction and sport performance factors were found to be negatively predictive of event consumption factors. For on-site consumers, none of the push and pull factors were found to be related to the consumption factors.

These results indicate that unlike research findings derived in other research settings mainly conducted in Western countries, push and pull factors are more functional for online CTTSL consumers who are of comparatively stronger fandom level, which are likely affected by CTTSL’s contemporary operations.

Enriching the dual process theory through examining its applicability in studying sport consumer behavior, from both perspectives of internal and external motivations; applying theories and research findings of internal and external motivations that have primarily been derived in Western countries into a professional sport setting in China; identifying unique and diverse perspectives of professional table tennis consumers in China between online and on-site consumers; contrary to the findings derived in Western countries, the motivational factors are more functional for online CTTSL consumers who are of comparatively stronger fandom level, which are likely affected by CTTSL’s contemporary operations; and conducting micro-perspective analyses to study Chinese sport consumer behaviors, which has rarely been done in contemporary scholarly inquiries in China.

The economy of China has developed rapidly, and its international status has quickly risen in the past 30 years. China is shifting from a major exporter into a major consumer, becoming an essential part of the international market. However, some global brands make wrong market decisions because of a lack of understanding of Eastern consumer culture.

Based on consumer xenocentrism, this paper helps global enterprises better understand Chinese consumers' psychology in foreign goods, which is conducive to the development of transnational trade. This study proposes a hypothesis model based on previous literature. The authors collected 300 questionnaires from China and tested the model by SPSS24 and AMOS24.

The findings show that curiosity and country of origin positively affect consumer xenocentrism, consumer xenocentrism has a positive impact on word-of-mouth and purchase intention, word-of-mouth plays a mediating role in xenocentrism and purchase intention and social comparison tendency plays a moderating role in consumer xenocentrism and purchase intention. Simultaneously, this paper develops a scale measuring consumer xenocentrism to provide some quantitative support for this research.

The authors propose some suggestions basing on the research of consumer xenocentrism and provide some further directions.

By using table tennis as an example and conducting an in-depth investigation into the impact of market demand factors on membership consumption of table tennis club members in the USA, the purpose of this paper is to illustrate the opportunities and marketing efforts needed for Asian sports to survive and thrive in North America, in which consumer demand factors assessing core program features of table tennis clubs were found to be very influential of cognitive, affective, and behavioral consumptions of table tennis club members.

Through conducting a review of literature, observations of club operations, and interviews of club administrators and club members representing various table tennis clubs, a preliminary questionnaire was formulated for this study. The initial questionnaire was submitted to a panel of five experts, for a test of content validity. By incorporating their suggestions, editing was made to improve a number of the items in the questionnaire. Data collection took place in two national table tennis tournaments, two local tournaments, and six table tennis clubs. Procedures in SPSS 19.0 (SPSS, 2009) and Mplus 5.21 were carried out for data analyses.

The findings of this study are that market demand factors would be significantly related to consumer perceived benefits and perceived value, and in turn related to consumer satisfaction of table tennis club membership. The market demand factors had a positive impact on perceived value and benefits confirmed the theoretical framework and previous research findings, which also made a practical sense that a table tennis club needs to offer product features and meet expectations of its current and potential members in order to enhance program value and benefits perceived by its members.

The past two decades have marked the speediest rise of a globalized sport production and consumption trend. In an era of globalized sport marketplace, sports have become a business commodity to meet the needs of commerce. For an Asian sport to penetrate into the North American marketplace as table tennis has done, it would be wise to develop regional network, strategies, product, and promotions. It is expected that table tennis as a popular Asian sport will continue being spread to other parts of the world; thus, the findings of this study have potential relevance to promoting table tennis globally.

The purpose of this study was to synthesize composite nanoparticles (TiO₂@SiO₂) via the chemical deposition method and investigate their efficacy as additives in polytetrafluoroethylene (PTFE) lubricating grease. The focus was on examining the frictional and conductive properties of the TiO₂@SiO₂ grease using a friction tester.

Composite nanoparticles (TiO₂@SiO₂) were synthesized using the chemical deposition method and incorporated into PTFE grease. Frictional and conductive properties were evaluated using a friction tester. Surface morphology and chemical composition of wear tracks were analyzed using scanning electron microscope and X-ray photoelectron spectroscopy, respectively.

Incorporating TiO₂@SiO₂ at a mass fraction of 1 Wt.% led to a significant reduction in friction coefficient and wear width. The wear depth exhibited a remarkable decrease of 260%, while the contact resistance reached its peak value. This improvement in tribological properties could be attributed to the presence of TiO₂@SiO₂, where TiO₂ served as the core and SiO₂ as the shell during the friction process. The high hardness of the SiO₂ shell contributed to enhanced load-bearing capacity. In addition, the exceptional insulation properties of SiO₂ demonstrated excellent electron-capturing capabilities, resulting in improved friction and insulation performance of the TiO₂@SiO₂ lubricating grease.

This study demonstrates the potential of TiO₂@SiO₂ composite nanoparticles as additives in lubricating greases, offering improved friction and insulation performance. The findings provide insights into the design of advanced lubricating materials with enhanced tribological properties and insulation capacity, contributing to the development of more efficient and durable lubrication systems.

The purpose of this paper is to construct the algebraic traveling wave solutions of the (3 + 1)-dimensional modified KdV-Zakharov-Kuznetsve (KdV-Z-K) equation, which can be usually used to express shallow water wave phenomena.

The authors apply the planar dynamical systems and invariant algebraic cure approach to find the algebraic traveling wave solutions and rational solutions of the (3 + 1)-dimensional modified KdV-Z-K equation. Also, the planar dynamical systems and invariant algebraic cure approach is applied to considered equation for finding algebraic traveling wave solutions.

As a result, the authors can find that the integral constant is zero and non-zero, the algebraic traveling wave solutions have different evolutionary processes. These results help to better reveal the evolutionary mechanism of shallow water wave phenomena and find internal connections.

The paper presents that the implemented methods as a powerful mathematical tool deal with (3 + 1)-dimensional modified KdV-Z-K equation by using the planar dynamical systems and invariant algebraic cure.

By considering important characteristics of algebraic traveling wave solutions, one can understand the evolutionary mechanism of shallow water wave phenomena and find internal connections.

To the best of the authors’ knowledge, the algebraic traveling wave solutions have not been reported in other places. Finally, the algebraic traveling wave solutions nonlinear dynamics behavior was shown.