Effects of the “Gangnam Style Syndrome” on the South Korean stock market     

Hyun Joung Jin  Jang-Chul Kim 《Journal of Cultural Economics》2018,42(1):139-161

This study attempts to answer two questions. First, can a single cultural event impact the stock prices of a wide range of companies and sectors? Second, was the positive stock market response in the information technology (IT) sector as well as performing arts sector significant? To answer these questions, we examine whether a hit pop single, “Gangnam Style” by Park Jae-Sang in 2012, affected related sectors of the Korean stock market and whether market reactions went beyond the stock price of the singer’s agency to affect those of other firms. We use an event study approach. The results show two notable empirical findings. First, although the findings indicating abnormal returns and cumulative abnormal returns appear mixed, the overall results imply that the unprecedented worldwide hit single by the South Korean singer positively affected the Recreation & Culture and Digital Content sectors. In other words, the market interpreted the event as good news, with shareholders expecting positive effects on the related sectors. Second, a positive stock market response was observed in the IT sector as well.  相似文献   

Super-twisting observer-based sliding mode control with fuzzy variable gains and its applications to fully-actuated hexarotors     

Ngo Phong Nguyen  Wonhee Kim  Jun Moon 《Journal of The Franklin Institute》2019,356(8):4270-4303

In this paper, we consider the super-twisting observer-based sliding mode control algorithm with fuzzy variable gains (STOSMC) for the fully-actuated hexarotor. Our hexarotor has full actuation due to six titled propellers that allows to control position and orientation (attitude) simultaneously, and resolves the singularity problem of the rotational matrix by using the quaternion modeling framework. We show that the proposed STOSMC for the hexarotor guarantees finite-time convergence of the estimation error and asymptotic stability of the hexarotor. In simulations, we demonstrate the nonsingularity and fully-actuated control performance of the hexarotor by considering extreme position and attitude control scenarios. Moreover, the simulation results show that the hexarotor achieves the fast and precise tracking performance to the desired position and the desired attitude and the chattering phenomenon is reduced compared with the fixed-gains observer-based super-twisting sliding mode control due to the fuzzy mechanism.  相似文献   

Assessing volunteer satisfaction at the London Olympic Games and its impact on future volunteer behaviour     

Minhong Kim  Steven Suk-Kyu Kim  May Kim  James J. Zhang 《Sport in Society》2019,22(11):1864-1881

Abstract

In recent years, volunteering has received strong research attention from both scholars and practitioners. For the most part, involvement in volunteer activities has been identified as an important determinant of future volunteering. Through revalidating an existing instrument, the purpose of this study was to assess the dimensions of volunteer satisfaction at the 2012 London Olympic Games and its impact on future volunteer behaviour. The findings of this study shed light on the identification of volunteer satisfaction factors in the mega sporting event setting, particularly for a unique type of volunteer (i.e. media worker) assigned to a special set of tasks. Unlike Galindo-Kuhn and Guzley’s results that revealed participation efficacy and group integration to be strong predictors of volunteer satisfaction, organizational support was the primary predictor for media centre volunteers’ re-participation intention towards future volunteering programmes.  相似文献   

Prenatal Maternal Stress,Child Cortical Thickness,and Adolescent Depressive Symptoms     

Elysia Poggi Davis  Benjamin L. Hankin  Laura M. Glynn  Kevin Head  Dae Jin Kim  Curt A. Sandman 《Child development》2020,91(2):e432-e450

Prenatal maternal stress predicts subsequent elevations in youth depressive symptoms, but the neural processes associated with these links are unclear. This study evaluated whether prenatal maternal stress is associated with child brain development, and adolescent depressive symptoms using a prospective design with 74 mother child pairs (40 boys). Maternal stress was assessed during pregnancy, child cortical thickness at age 7, and depressive symptoms at age 12. Prenatal maternal stress was associated with less cortical thickness primarily in frontal and temporal regions and with elevated depressive symptoms; child cortical thickness additionally correlated with adolescent depressive symptoms. The observed associations are consistent with the possibility that cortical thickness in superior frontal regions links associations between prenatal maternal stress and adolescent depressive symptoms.  相似文献   

The influence of water depth on kinematic and spatiotemporal gait parameters during aquatic treadmill walking     

Taeyou Jung  Yumi Kim  Hyosok Lim  Konstantinos Vrongistinos 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(3):297-307

The purpose of this study was to investigate kinematic and spatiotemporal variables of aquatic treadmill walking at three different water depths. A total of 15 healthy individuals completed three two-minute walking trials at three different water depths. The aquatic treadmill walking was conducted at waist-depth, chest-depth and neck-depth, while a customised 3-D underwater motion analysis system captured their walking. Each participant’s self-selected walking speed at the waist level was used as a reference speed, which was applied to the remaining two test conditions. A repeated measures ANOVA showed statistically significant differences among the three walking conditions in stride length, cadence, peak hip extension, hip range of motion (ROM), peak ankle plantar flexion and ankle ROM (All p values < 0.05). The participants walked with increased stride length and decreased cadence during neck level as compared to waist and chest level. They also showed increased ankle ROM and decreased hip ROM as the water depth rose from waist and chest to the neck level. However, our study found no significant difference between waist and chest level water in all variables. Hydrodynamics, such as buoyancy and drag force, in response to changes in water depths, can affect gait patterns during aquatic treadmill walking.  相似文献   

Classification Consistency and Accuracy With Atypical Score Distributions     

Stella Y. Kim  Won-Chan Lee 《Journal of Educational Measurement》2020,57(2):286-310

The current study aims to evaluate the performance of three non-IRT procedures (i.e., normal approximation, Livingston-Lewis, and compound multinomial) for estimating classification indices when the observed score distribution shows atypical patterns: (a) bimodality, (b) structural (i.e., systematic) bumpiness, or (c) structural zeros (i.e., no frequencies). Under a bimodal distribution, the normal approximation procedure produced substantially large bias. For a distribution with structural bumpiness, the compound multinomial procedure tended to introduce larger bias. Under a distribution with structural zeroes, the relative performance of selected estimation procedures depended on cut score location and the sample-size conditions. In general, the differences in estimation errors among the three procedures were not substantially large.  相似文献   

Two IRT Fixed Parameter Calibration Methods for the Bifactor Model     

Kyung Yong Kim 《Journal of Educational Measurement》2020,57(1):29-50

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The education of academically gifted students in South Korea: Innovative approaches in shadow education     

Young Chun Kim  Jaeseong Jo  Jung-Hoon Jung 《European Journal of Education》2020,55(3):376-387

Shadow education contributes to the learning and academic careers of Korean students. It benefits, in particular, gifted students who are strongly motivated and who outperform their peers academically. In this study, we explored the innovative characteristics of shadow education curricula for gifted students in terms of curricular programmes, methods, and teaching-learning materials. Also, we explored how shadow education practices meet the academic abilities and needs of students. Informed by a literature review and qualitative research methods, the results reveal how common shadow education is; effects of shadow education; and innovative elements used in shadow education for gifted students in Korea. Overall, we found that shadow education plays a crucial role in gifted education; it is a necessary component for understanding academic excellence among students in Korea. The findings are helpful for teachers, curriculum developers, and policymakers as they explore how public schooling can help to support strongly motivated and academically advanced students.  相似文献   

A mechanism of mutually beneficial relationships between employees and consumers: A dyadic analysis of employee–consumer interaction     

Kyungyeol Kim  Kevin K. Byon 《Sport Management Review》2018,21(5):582-595

Although sport management researchers concur with one another regarding the significance of interaction between employees and consumers in shaping the consumers’ attitudes and behaviors, the vast majority of previous studies are largely isolated such that they take assessment exclusively from one side of the dyad—either employees or consumers. The authors seek to advance the current body of knowledge by utilizing a dyadic method that includes judgments provided by employees as well as one of each employee’s consumers in a high-contact sport service context (i.e., multi-purpose fitness centers). As such, the authors investigate how employee citizenship behavior and deviance behavior influence consumer citizenship behavior and participative behavior through consumers’ perceived service quality and satisfaction with employees. The results indicated that employee citizenship behavior positively and deviance behavior negatively shaped consumers’ perceptions of service quality, whereas the negative moderating effect of employee deviance behavior between employee citizenship behavior and service quality was not supported. Satisfaction with employees significantly mediated the relationship between service quality and consumer citizenship behavior but not between service quality and consumer participative behavior. Theoretical, methodological, and practical implications derived from this study are discussed.  相似文献   

A destination development by building a brand image and sport event tourism: a case of Sport City USA     

Young Hoon Kim  Hongxin Li  John Nauright 《Sport in Society》2018,21(8):1196-1203

Abstract

While visitors look for a complete ‘experience’ and select travel destinations on the basis of the total set of destination attributes, individual suppliers that operate independently usually market offer in fragmented pieces. A destination brand with strong equity leads to greater commitment in the form of loyalty and willingness to revisit the destination. As one of the key components for destination characteristics, the sports industry has rapidly developed in recent years. Two cities were discussed as the known for sport city case and Frisco, Texas was examined for the current study. The results of this study show that the economic impact is significant for a destination. Some critical factors (e.g. sustainability) should be discussed in future study.  相似文献