Search results

This paper aims to implement a new high output power fully integrated 23.1 to 27.2 GHz gallium arsenide heterojunction bipolar transistor power amplifier (PA) to meet the stringent linearity requirements of LTE systems.

The direct input power dividing technique is used on the chip. Broadband input and output matching techniques are used for broadband Doherty operation.

The PA achieves a small-signal gain of 22.8 dB at 25.1 GHz and a saturated output power of 24.3 dBm at 25.1 GHz with a maximum power added efficiency of 31.7%. The PA occupies 1.56 mm² (including pads) and consumes a maximum current of 79.91 mA from a 9 V supply.

In this paper, the author proposed a novel direct input dividing technique with broadband matching circuits using a low Q output matching technique, and demonstrated a fully-integrated Doherty PA across frequencies of 23.1∼27.2 GHz for long term evolution-license auxiliary access (LTE-LAA) handset applications.

There are a large number of interdependent risk factors in complex project. Risk response strategy without considering risk correlation cannot achieve good risk response. Therefore, the purpose of this paper is to propose a risk response strategy selection model considering risk correlation based on the grey K-shell algorithm.

This paper mainly focuses on the measurement of two aspects of risk factors. One is the ability of the risk factors to influence other risk factors, another is the degree affected by other risk factors. Both of the above are measured by the grey K-shell algorithm improved in this paper, and the weights of these are used for the constructing of risk response strategy selection model.

The risk response strategy considering risk relevance is more effective than the risk response strategy without considering risk relevance. Also, results indicate that as the risk response budget increases the risk response effect also increases, and the increasing trend is weakens. The relative gap between the effect of response strategies considering risk relevance and the strategy without considering risk relevance increases first and, then, decreases with the increase of budget.

The results of this paper demonstrate that the risk response strategy considering risk relevance is more effective than not considering risk relevance. The approach presented in this paper can guide project managers’ risk decisions and may also help to find the best risk response budget.

Independent directors are important corporate decision participants and makers. Based on the Chinese cultural background, this paper interprets the listing order of independent directors as independent directors’ status, exploring their influence on the corporate research and development (R&D) behavior.

This paper studies A-share listed firms in China from 2008 to 2018 as the sample. The main method is ordinary least square (OLS) regression. We also use other methods to deal with endogenous problems, such as the firm fixed effect method, change model method, two-stage instrumental variable method, and Heckman two-stage method.

(1) Higher independent directors’ status attribute to more effective exertion of supervision and consultation function, and positively enhance the corporate R&D investment. The increase of the independent director’ status by one standard deviation will increase the R&D investment by 4.6%. (2) The above effect is more influential in firms with stronger traditional culture atmosphere, higher information opacity and higher performance volatility. (3) High-status independent directors promote R&D investment by improving the scientificity of R&D evaluation and reducing information asymmetry. (4) The enhancing effect of independent director’ status on R&D investment is positively associated with the firm’s patent output and market value.

This paper contributes to understanding the relationship between the independent directors’ status and their duty execution from an embedded cultural background perspective. The findings of the study enlighten the improvement of corporate governance efficiency and the healthy development of the capital market.

This study clarifies the operational performance of fashion companies during the coronavirus pandemic. Meanwhile, improvement strategies have been provided in the post-pandemic era.

The static and dynamic perspectives were combined to comprehensively analyze the operational performance of fashion companies before, during and after the COVID-19 outbreak. A comparative analysis among five representative countries was conducted to achieve global conclusions. Additionally, data envelopment analysis (DEA) theory and various DEA models were employed for the analysis.

The fashion industry has not achieved overall effectiveness. American companies have the best operational performance, followed by European and Chinese companies. In contrast, the impact of the pandemic on American companies was severe, whereas Chinese and European companies showed operational resilience. In addition, the pandemic had a devastating influence on the global fashion industry. This resulted in a decline in total factor productivity, and the main reason was technological regress. Furthermore, labor redundancy is a critical issue for the fashion industry in the post-pandemic era, even if it shows a decrease because of the pandemic.

The existing theory on the fashion industry during the pandemic was improved by expanding the time and geographical dimensions and integrating the advantages of various DEA models. Scientific improvement strategies were presented in the post-pandemic era with application value.

This study examined the impact of environmental factors on consumers’ intention to use buy online in-store returns (BORS) services. Specifically, it investigates how integrating environmental knowledge and consequence awareness into the theory of planned behavior (TPB) influences consumers’ intention to adopt BORS services.

Data were collected through a structured questionnaire and analyzed using statistical methods to explore the relationships between attitude, subjective norm, perceived behavioral control, environmental factors and intention to use BORS services.

The findings indicate that attitude, subjective norm and environmental knowledge significantly increase consumers’ intention to use BORS services. Additionally, the interaction of attitude and environmental knowledge further enhances consumers’ intention to use BORS services.

This study contributes to the limited literature on the drivers of consumers’ adoption of BORS services by integrating environmental factors with TPB. It provides new insights into how targeted environmental education and promotion activities can influence consumers’ behavior toward sustainable practices, providing valuable strategies for retailers to support sustainable development goals.

Taking a 2,000 r/min 10 kW permanent magnet motor as an example, the purpose of this paper is to study the influence of driving modes on the performance of permanent magnet motor at limit conditions, and researched the variation mechanism of motor performance influenced by different driving modes.

A two-dimensional electromagnetic field model of the permanent magnet motor was established, and a rectangular-wave driving circuit was built. By using the finite element method, the electromagnetic field, current, harmonic content and eddy current loss were calculated when the motor operated at rated load and limit load. On the basis of the motor loss calculation, the temperature field of the motor operating at rated condition and limit condition was researched, and the factors that influence motor limit overload capacity were analyzed. By analyzing the motor loss variation at different load conditions, the change mechanism of the motor temperature field was determined further. Combined with the related experiments, the correctness of the above analysis was verified.

Permanent magnet synchronous motor (PMSM) driven by sine wave is better compared with brushless direct current motor (BLDCM) driven by rectangular wave in reducing the magnetic field harmonics, motor losses and optimizing the temperature distribution in the motor. The method driven by sine wave could improve the motor output performance including the motor efficiency and the motor overload capacity. The winding temperature is the most important factor that limits the output capability of PMSM operating for a long time. However, because of the large rotor eddy current losses, the permanent magnet temperature is the most important factor that limits the output capability of BLDCM operating for a long time.

The influence of driving modes on the motor magnetic field, losses and temperature distribution, efficiency and overload capacity was determined, and the influence mechanism was also analyzed. Combined with the analysis of the electromagnetic and temperature fields, the advantages of different driving modes were presented. This study could provide an important basis for the design of permanent magnet motors with different driving modes, and it also provides reference for the application of permanent magnet motor.

This paper presents the influence of driving modes on permanent magnet motors. The limit output capacity of the motor with different driving modes was studied, and the key factors limiting the motor output capability were obtained.

The purpose of this paper is to propose a subcontractor selection model to fully consider the impact of construction enterprise demands on subcontractor selection. The objectives are to understand the translating process of specific enterprise demands to the evaluating criteria and the weight calculation process.

A three-stage model of subcontractor selection was designed based on quality function deployment (QFD), analytic hierarchy process (AHP) and improved grey correlation analysis (IGCA). In the proposed model, specific enterprise demands are translated by the QFD method, and the weights of the criteria are determined by the IGCA. The AHP is used to quantify the exporters' experience and construct the judgment matrix, which is used as inputting of the grey correlation analysis.

The proposed model provides a feasible process for subcontractor selection by fully considering the actual requirements of the project. By combining the company requirements and project requirement to put forward the requirements of the target subcontractor, the selection process ensures that the selected subcontractor and the project have a higher “fit”

Few researches on construction subcontractor selection have taken into account the “voice” of the company's stakeholders. Therefore, this paper designs a three-stage construction subcontractor selection model by introducing QFD to achieve the transmission of “voice” in the subcontractor selection process, so as to take full consideration of the project objectives and the needs of the company's stakeholders. Meanwhile, in order to decrease the subjective of weight calculation, this paper designs an AHP-IGCA allocation method to determine the weight of relevant indicators. By integrating the proposed weight calculation method and QFD method, the subcontractor selection results become more reasonable and objective.

The purpose of this paper is to identify a need to incorporate Asian perspectives in theories of food consumption and marketing.

This editorial discusses the mutually recursive relationship between food and culture in Asian markets, offers an integrative summary of the special issue and develops several key themes for future research.

Food consumption plays a central role within Asian cultures and markets. Thus, understanding Asian perspectives and contexts provides an important complement and contrast to current theories of food consumption and marketing that have been primarily sited in North American and European contexts. In particular, the complex multiplicity of Asian consumer cultures creates dynamic heterogeneity within Asian food markets.

Although food consumption plays a central role in Asian consumer cultures, extant theory regarding Asian food consumption and marketing is still in its infancy. We highlight important developments in this area that suggest a path for future work.

The authors make three contributions to the literature on food consumption and marketing. First, while engaging with these questions, this issue points to the importance of Asian cultural perspectives into the marketing literature on food consumption. Second, through the articles of this special issue, we trace the relationships between food consumption practices, marketing practices and cultural multiplicity in Asian contexts. Finally, we draw the threads together to provide directions for future research in this area.

The purpose of this paper is to investigate if consumer buying motives regarding organic food in emerging economies China and Brazil are culture bound or determined by key characteristics of the product.

A survey was collected in Guangzhou, China, and Porto Alegre, Brazil. Data were analyzed by means of structural equation modeling, checking for measurement invariance between samples.

The reasons why Brazilian and Chinese consumers buy organic food are strikingly similar to what is found in Europe and North America. Consumers’ attitude toward buying organic food is strongly linked to beliefs about its healthiness, taste and environmental friendliness. Also, consumer attitudes toward buying organic food are positively related to what Schwartz’s “Universalism” values in all studied cultures.

Correlational (survey) data do not allow conclusions about causality and conclusions are limited by the covered countries and products.

Key consumer value propositions with respect to organic food seem cross-culturally valid and universally accepted by a segment of customers that share these values. Hence, organic food can be marketed globally based on a universal set of key value propositions. The same could be true for other global products sharing similar types of certifiable value propositions.

New insights of value for the cross-cultural marketing of “green” and ethical consumer products.

Fills a gap in research regarding the extent to which consumer purchase motives are culture bound or determined by the characteristics of the product.

Values-attitudes hierarchical models are quite frequent in the consumer behaviour literature. In attitudinal models specific to food produced in an environmentally friendly way (i.e. “green” food), past research evidence mainly originating in Western cultures posits that the strongest path of the model can be found among collectivistic consumer values, general environmental attitudes, and attitudes specific to green food. On the other hand, in non-Western cultures (i.e. China), green food (e.g. organic) is perceived by consumers as safer to consume. With this as point of departure, the present paper aims to examine whether attitudes towards green food in a values-attitudes model in China are determined as postulated in past Western research.

A “typical” (i.e. Western research evidence-based) values-attitudes hierarchical model was developed and a questionnaire comprising 34 items reflecting the conceptual model was designed. Data collection was focused on six major Chinese cities, as this is where the current changes in eating habits are predominantly taking place. Data were collected by personal interviews conducted by local researchers between January and March 2009 through a mall-intercept method. A total number of 479 respondents were recruited, equally distributed among the six cities.

Collectivistic values and environmental attitudes were still found to be strong determinants of Chinese consumers' attitudes towards green foods; contrary to relevant Western findings, however, collectivism also influenced technological attitudes; which, in turn, influenced attitudes towards green food jointly with environmental attitudes. These findings point to the conclusion that Chinese consumers, possibly guided by altruistic predispositions, see technology as a positive determinant of both food safety and environmental friendliness in food production. Empirical findings like these highlight the need for adaptation of well-substantiated models to completely customised research approaches within new globally rising environments.

It is still not quite clear how green food products are perceived in South-East Asian consumer cultures, as well as in other non-Western contexts. This scarcity makes the empirical examination of well-established values-attitudes hierarchies in such contexts valuable from an academic and practitioner's point of view.