A hidden cost of strategic alliances under Schumpeterian dynamics     

Jeho Lee  Seung Ho Park  Young Ryu  Yoon-Suk Baik 《Research Policy》2010,39(2):229-238

Recently, proponents of interfirm R&D collaboration have emphasized its benefits. We develop a dynamic model of Schumpeterian competition to examine whether such collaboration is indeed beneficial in the long run. We find that interfirm R&D collaboration is more likely to be a losing strategy when partners form alliances mainly to reduce R&D costs. On the other hand, partners collaborating to seek synergy by accessing each other's complementary assets/capabilities are more likely to be successful. Our study suggests that firms should not use strategic alliances merely to reduce R&D costs in a catch-up situation or to avoid head-on competition with rivals.  相似文献   

Cascading effects of Chinese American parents' COVID-19 racial discrimination and racial socialization on adolescents' adjustment     

Huiguang Ren  Charissa S. L. Cheah  Hyun Su Cho  Ana Katrina Aquino 《Child development》2024,95(3):862-878

Using a three-wave longitudinal sample of 108 Chinese American parent-adolescent dyads (M_parent-ageW1 = 45.44 years, 17% fathers; M_{adolescent-ageW1} = 13.34 years, 50% boys), this study examined the effects of parents' COVID-19-related racial discrimination experiences on adolescents' ethnic identity exploration and anxiety as mediated by parents' awareness of discrimination (AOD) socialization and moderated by parents' anxiety and racial socialization competency (RSC). Parents' racial discrimination experiences in 2020 predicted adolescents' greater ethnic identity exploration or greater anxiety in 2022 via parents' greater use of AOD in 2021, depending on the levels of parents' anxiety and RSC. These findings highlighted individual and contextual factors impacting racial socialization processes in Chinese American families.  相似文献   

The impact of past performance on information valuation in virtual communities: Empirical study in online stock message boards     

Hyun Mo Kim  SunHo Jung  JaeHong Park 《Information processing & management》2018,54(4):740-753

Unlike other types of virtual communities, individuals participate in online stock message boards for their material needs rather than non-material needs (e.g., sense of belonging). They may seek and read others’ opinions to make better investment performances. The value of information in online stock message boards may vary from person to person according to their past investment experiences. However, little is known regarding how their past investment performance influences the value of others’ opinions. Therefore, our study investigates how individuals process others’ opinions on stock message boards for their investment decisions when they have different levels of past investment performance. We proposed the unique research model with two paths consisting of both online stock message board factors and individual factors to determine continuous use of online stock message boards. We conducted SEM analysis with 452 questionnaire data. The results, first, showed that message boards factors (e.g., satisfaction using others’ opinions) have a positive impact on continuous intention to use while their own satisfaction with past investment activities has a negative impact on continuous intention to use. In addition, we believe that this is one of the few papers to examine the moderating role of self-attribution bias on the effects of stock investment performance. Our results indicated that investors with strong self-attribution bias lower the usefulness of opinions when losing money while they increased confidence in their investment-related abilities when achieving a profit from investment. This study will help to support and extend the theory of IS continuance model while providing practical insights for online stock message board managers by suggesting ways to vitalize online stock message boards.  相似文献   

The kinematic differences between skill levels in the squash forehand drive,volley and drop strokes     

Benjamin K. Williams  Ross H. Sanders  Joong Hyun Ryu  Philip Graham-Smith  Peter J. Sinclair 《Journal of sports sciences》2020,38(13):1550-1559

ABSTRACT

Knowledge of the kinematic differences that separate highly skilled and less-skilled squash players could assist the progression of talent development. This study compared trunk, upper-limb and racket kinematics between two groups of nine highly skilled and less-skilled male athletes for forehand drive, volley and drop strokes. A 15-camera motion analysis system recorded three-dimensional trajectories, with five shots analysed per participant per stroke. The highly skilled group had significantly (p < 0.05) larger forearm pronation/supination range-of-motion and wrist extension angles at impact than the less-skilled. The less-skilled group had a significantly more “open” racket face and slower racket velocities at impact than the highly skilled. Rates of shoulder internal rotation, forearm pronation, elbow extension and wrist flexion at impact were greater in the drive stroke than in the other strokes. The position of the racket at impact in the volley was significantly more anterior to the shoulder than in the other strokes, with a smaller trunk rotation angular velocity. Players used less shoulder internal/external rotation, forearm pronation/supination, elbow and wrist flexion/extension ranges-of-motions and angular velocities at impact in the drop stroke than in the other strokes. These findings provide useful insights into the technical differences that separate highly skilled from less-skilled players and provide a kinematic distinction between stroke types.  相似文献   

Effects of arch-support orthoses on ground reaction forces and lower extremity kinematics related to running at various inclinations     

Wing-Kai Lam  Lok-Yee Pak  Charis King-Wai Wong  Mohammad Farhan Tan  Sang-Kyoon Park  Jiseon Ryu 《Journal of sports sciences》2020,38(14):1629-1634

ABSTRACT

While foot orthoses are commonly used in running, little is known regarding biomechanical risk potentials during uphill running. This study investigated the effects of arch-support orthoses on kinetic and kinematic variables when running at different inclinations. Sixteen male participants ran at different inclinations (0°, 3° and 6°) when wearing arch-support and flat orthoses on an instrumented treadmill. Arch-support orthoses induced longer contact time, larger initial ankle dorsiflexion, maximum ankle eversion, and knee sagittal range of motion (RoM) (p < 0.05). As incline slopes increased, vertical impact peak and loading rate, stride length, and ankle coronal RoM decreased, but contact time, stride frequency, initial ankle dorsiflexion and inversion, maximum dorsiflexion, initial knee flexion, and ankle sagittal RoM increased (p < 0.05). Furthermore, knee sagittal RoM was lowest when running at an inclination of 3°. The interaction effect indicated that in arch-support condition, participants running at 6° induced higher maximum ankle eversion than running at 0° (p < 0.05), while no differences were found in flat orthosis condition. These findings suggest that the use of arch-support orthoses would influence running biomechanics that is related to injury risks. Running at higher inclination led to more alterations to biomechanical variables than at lower inclination.  相似文献   

DEVELOPMENTALLY AND CULTURALLY APPROPRIATE PRACTICE (DCAP)‐BASED EARLY CHILDHOOD TEACHER PREPARATION MOVEMENT THROUGH NAECTE RESEARCH‐NET ACTIVITY: A BRIEF REPORT     

Eunsook Hyun  Saundra DiPento  Georgianna Duarte  Celeste Matthews  Rosario Morales  Jocelynn Smrekar 《Journal of Early Childhood Teacher Education》2013,34(2):215-226

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EXAMINATION OF EARLY CHILDHOOD PRACTITIONERS’ GENERAL PERCEPTION OF GENDER DIFFERENCES IN YOUNG CHILDREN     

Eunsook Hyun  J. Michael Tyler 《Journal of Early Childhood Teacher Education》2013,34(3):337-354

This study attempts to explore and discuss preschool teachers’ perception of gender differences in young children through their verbal expression. The teachers (Study I, n —121, Study II, n= 31) in this study perceive female preschoolers as positive and sensitive learners. While many learner qualities such as inventive, problem‐solver, builder, hands‐on, questioning, etc. are identified more often for boys than girls, overall the teachers’ perception of the boys’ group is less “teachable” and “easy to work with” than the girls group. In addition, one of the most intriguing and concerning observations is that girls are perceived as “passive learners” and therefore they are more “teachable” than boys. As implications of the study, the paper discusses an important understanding of gender‐fair and gender‐congruent pedagogical awareness for developmentally and culturally appropriate practice in early childhood education.

This study was originally presented at the 1999 AERA Annual Meeting, April 19‐23, Montreal, Canada, and was titled Examination of Preschool Teachers’ Biased Perception on Gender Difference.  相似文献   

Playing at School: An Inquiry Approach to Using an Experiential Play Lab in an Early Childhood Teacher Education Course     

Kristen M. Kemple  Ji Hyun Oh  Daniella Porter 《Journal of Early Childhood Teacher Education》2013,34(3):250-265

Play is considered an important activity of the early childhood years. Research supports the contribution of play to children’s development, learning, and well-being. In spite of this, time for play is being pushed out in many early childhood programs by greater time allotted to formal instruction in narrow academic skills to be tested eventually by standardized tests. As a result, current preservice teachers are likely to see fewer examples of appropriate time and support for play in their field placements in early childhood settings. The purpose of this study was to document and analyze what happens when an experiential play lab is implemented in an early childhood teacher education program. This qualitative study includes multiple forms of data collection, including two forms of reflective writings and group discussions. After the workshop, preservice teachers made a greater number of references to play in their defense of developmentally appropriate practice, and the nature of their references to play increased in their focus on play process and on teacher roles in children’s play, as compared to prior to the lab. The results of this study of an experiential play intervention support its potential as a means of probing, documenting, and enriching students’ understanding of the importance of providing for and supporting play in classrooms for young children.  相似文献   

The Role of Centering for Interaction of Level 1 Variables in Multilevel Structural Equation Models     

Ehri Ryu 《Structural equation modeling》2013,20(4):617-630

This article examined the role of centering in estimating interaction effects in multilevel structural equation models. Interactions are typically represented by product term of 2 variables that are hypothesized to interact. In multilevel structural equation modeling (MSEM), the product term involving Level 1 variables is decomposed into within-cluster and between-cluster random components. The choice of centering affects the decomposition of the product term, and therefore affects the sample variance and covariance associated with the product term used in the maximum likelihood fitting function. The simulation study showed that for an interaction between a Level 1 variable and a Level 2 variable, the product term of uncentered variables or the product term of grand mean centered variables produced unbiased estimates in both Level 1 and Level 2 models. The product term of cluster mean centered variables produced biased estimates in the Level 1 model. For an interaction between 2 Level 1 variables, the product term of cluster mean centered variables produced unbiased estimates in the Level 1 model, whereas the product term of grand mean centered variables produced unbiased estimates for the Level 1 model. Recommendations for researchers who wish to estimate interactions in MSEM are provided.  相似文献   

The ancient mariner speaks: examining regimes of truth in ADHD     

Jihee Ryu 《International Journal of Disability, Development & Education》2013,60(1):67-68

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