Enhanced Reverse Recovery Performance in Superjunction MOSFET with Reduced Hole-Barrier

High reverse recovery charge (QRR) and resultant high switching losses have become the main factors that constrain the performance and application area of superjunction MOSFET (SJ-MOSFET). To reduce QRR, an SJ-MOSFET with reduced hole-barrier is proposed and demonstrated. By introducing a Schottky contact on the bottom of the n-pillar at the drain side, the barrier for the hole carrier is dramatically reduced in the reverse conduction state. As a result, the hole carrier in the drift region is significantly reduced, which results in a low QRR and enhanced reverse recovery performance. Compared with the conventional SJ-MOSFET (Conv-SJ-MOSFET), the proposed device achieves 64.6% lower QRR with almost no sacrifice in other characteristics. The attenuated QRR accounts for a 19.6% ~ 46.8% reduction in total power losses with operation frequency at 5 ~ 200 kHz, demonstrating the great potential of the proposed SJ-MOSFET used in power conversion systems.

Identifying aggressive versus ethical sales supervision in B2B service recovery: a multilevel perspective

PurposeThe current research provides a conceptual framework that explains how sales managers' aggression across business-to-business (B2B) sales organizations triggers salespeople's surface acting, deep acting and service recovery performance. It also investigates the moderating role of ethical leadership through sales managers' aggressiveness on service recovery performance.Design/methodology/approachThe authors test the model using multilevel analysis with cross-sectional data of 367 salespeople from different sales organizations.FindingsThe study shows that the aggression of sales managers has an adverse influence on service recovery performance. Additionally, aggressiveness among sales managers is positively connected with surface acting while adversely affecting deep acting. The study’s findings also indicate that ethical sales leadership is positively moderate among sales managers' aggressiveness and service recovery performance.Research limitations/implicationsThe authors collected data from individual salespersons, which is the limitation; however, future studies could collect data using the dyadic approach, such as matching responses from both managers and salespersons. This method could enhance the model's internal validity.Originality/valueSeveral studies have mainly focused on positive supervision styles in the literature on service recovery. At the same time, building a negative supervision model in the B2B service recovery context, which has been persistently ignored, is noteworthy.

THE IMPORTANCE OF PERSONALITY TRAITS ON SERVICE RECOVERY PERFORMANCE IN THE HOTEL INDUSTRY OF MALAYSIA

Service recovery in the hotel industry is really valuable as it ensures the happiness and loyalty of consumers. In addition to intensive jobs, lengthy and unpredictable working hours and routines are the standards for hotel workers, which could give a significant effect on the job efficiency of the hotel staff. Regarding the efficiency of service recovery, a large number of studies have been published. The number of studies on personality characteristics for the success of service recovery, however, is small. This present research was carried out to provide a conceptual framework for future researchers to explore and give empirical evidence that exists between personality traits and service recovery performance among hotel workers in Malaysia based on the problems and study gaps in this industry. Five functions of personality characteristics were included in this conceptual work; extraversion, conscientiousness, agreeableness, emotional stability and openness to experience on service recovery performance. In conclusion, the outcomes could lead to the relevance of service recovery performance in the hotel industry.

Service recovery performance and repurchase intentions: the mediation effect of service quality at KFC

PurposeThis paper investigates the effects of service quality on customer satisfaction and repurchase intentions among customers of the KFC Fast Food Restaurant Chains.Design/methodology/approachIn total, 500 randomly sampled KFC restaurant customers were surveyed using a quantitative research design. The partial least square technique was used for data analysis.FindingsThis paper shows that service quality and recovery directly impact customers' repurchase intention. The results further showed that a positive and significant connection exists between customer satisfaction and repurchase intentions.Practical implicationsThe study recommends that KFC utilizes service quality dimensions to meet their customers' expectations and elicit repurchase intentions necessary to remain competitive in the fast-food industry.Originality/valueThis paper highlights the impact of service quality in developing loyal customers in the fast-food sector. It offers managers insight into understanding the factors positively impacting repurchase intentions and the nexus between service recovery performance and repurchase intentions from an emerging market perspective.

Coordination of synchronous compensators and converters to improve the commutation failure recovery performance in HVDC systems

A novel control strategy of synchronous compensators and converters is proposed to increase the ability of line commutated converter (LCC) based HVDC systems to successfully recover from commutation failures (CFs). The dynamic var support is one of the most important factors, which impact the commutation process. Many synchronous compensators have been implemented to enhance the transient voltage stability for improving the CF recovery performance. However, the traditional automatic voltage regulator (AVR) of synchronous compensator may not be suitable for the commutation voltage support, because the transient var demand of converters during the CF recovery is neglected. In our work, the voltage control will be adaptively adjusted, depending on the state of converters. Case studies based on simulations in PSCAD/EMTDC show that the proposed strategy can improve the performance of fault recovery from CF.