排序方式： 共有121条查询结果，搜索用时 15 毫秒
21.
Effects of light refraction on the accuracy of camera calibration and reconstruction in underwater motion analysis 总被引：1，自引：0，他引：1
Kwon YH Casebolt JB 《Sports biomechanics / International Society of Biomechanics in Sports》2006,5(2):315-340
One of the most serious obstacles to accurate quantification of the underwater motion of a swimmer's body is image deformation caused by refraction. Refraction occurs at the water-air interface plane (glass) owing to the density difference. Camera calibration-reconstruction algorithms commonly used in aquatic research do not have the capability to correct this refraction-induced nonlinear image deformation and produce large reconstruction errors. The aim of this paper is to provide a thorough review of: the nature of the refraction-induced image deformation and its behaviour in underwater object-space plane reconstruction; the intrinsic shortcomings of the Direct Linear Transformation (DLT) method in underwater motion analysis; experimental conditions that interact with refraction; and alternative algorithms and strategies that can be used to improve the calibration-reconstruction accuracy. Although it is impossible to remove the refraction error completely in conventional camera calibration-reconstruction methods, it is possible to improve the accuracy to some extent by manipulating experimental conditions or calibration frame characteristics. Alternative algorithms, such as the localized DLT and the double-plane method are also available for error reduction. The ultimate solution for the refraction problem is to develop underwater camera calibration and reconstruction algorithms that have the capability to correct refraction. 相似文献
22.
Vicki Sung-yeon Kwon 《Inter-Asia Cultural Studies》2019,20(2):180-203
ABSTRACTThis paper examines the Guyanese Mass Games, multi-media spectacles of visual and performing arts initiated by the leader of the Co-Operative Republic of Guyana and performed by Guyanese artists and youth aided by North Korean artists. North Korea and Guyana staged the games as the postcolonial and anti-imperialist expression of a newly established socialist regime in the global South in the context of the Cold War. Staged annually from 1980 to 1992 as part of the national day celebrations, they sparked debate, antagonism, and ethnic and political conflict in Guyana. The encounter of North Korean artists and Guyanese artists resulted in the new cultural tradition of the Guyanese Mass Games, which incorporated elements of Guyana's local culture into the form of the North Korean Mass Games. The paper expands the method of “inter-referencing” to incorporate a cross-continental dimension to analyze the cultural event of the Mass Games in North Korea and Guyana. The analysis in this paper is grounded in archival materials relating to the Guyanese Mass Games, such as sketch paintings, choreography books, photos, and newspaper articles, and examines how the representation of the people and land in the Mass Games captures the ambivalent character of decolonization and modernization projects in the socialist regime of Guyana. 相似文献
23.
Inclusion has occupied the centre of attention in education in many countries for the past few decades, and it is the same in South Korea. Although most researchers and educators agree that inclusion is necessary for equal educational opportunities and social participation of students with disabilities, there are debates about the most effective and appropriate services for these students and how teachers should deliver these services. The purpose of this article is to introduce the educational system and the unique cultural situation in South Korea to the reader and to suggest future directions for successful inclusion. Inclusion can grow and be meaningful in South Korea if it is based on the thoughtful and sustained efforts of people who have the passion and compassion that inspires others to listen to different opinions. Finally, successful inclusion can come about when the government supports changes in the community and schools. 相似文献
24.
Brian A. Bottge Enrique Rueda Perry T. LaRoque Ronald C. Serlin Jungmin Kwon 《Learning disabilities research & practice》2007,22(2):96-109
This mixed‐methods study assessed the effects of Enhanced Anchored Instruction (EAI) on the math performance of adolescents with learning disabilities in math (MLD). A quasi‐experimental pretest–posttest control group design with switching replications was used to measure students' computation and problem‐solving skills on EAI compared to control conditions. Scores on the curriculum‐aligned and standardized measures showed improved problem‐solving skills but results were mixed for computation. To augment the numerical data, a qualitative inquiry captured day‐to‐day classroom activities. The findings showed that problem‐based curricula such as EAI have the potential for helping students with MLD develop deeper understandings of math concepts but that considerable effort is required to structure and teach these concepts in ways students with MLD understand. 相似文献
25.
Jungmin Kwon 《Diaspora, Indigenous, and Minority Education》2019,13(2):113-122
The study reported in this paper focuses on the narratives of six adult Third Culture Kids (TCKs) who lived in multiple countries during developmental years. It explores their childhood experiences with mobility and the impact that multiple shifts in location, culture, and language have had on their adult lives. The results indicate that they come to terms with their identities, which are closely connected to multiple cultures and countries. Participants reported a desire to maintain nomadic lives, which may have been impacted by the multilingual competence and nuanced cultural understanding they gained through mobile upbringings. They also commonly expressed a desire to build social relationships with other individuals with migrant backgrounds. The results demonstrate the necessity of supporting the growing community of TCKs in maximizing the potential benefits of cross-cultural experiences while helping them navigate the challenges of identity, transition, and relocation. 相似文献
26.
This study examined gender differences in information behavior concerning Wikipedia. Data were collected using a Web survey in spring 2008. The study used a convenient sample that consisted of students who had taken an introductory undergraduate course at a large public university in the Midwestern United States. A total of 134 out of 409 students participated in the study. As information consumers, male students used Wikipedia more frequently than their female counterparts did. With respect to the purposes of Wikipedia use, male students used Wikipedia for entertainment or idle reading more than their female counterparts, while there were no gender differences regarding Wikipedia use for other purposes. Male students were more likely to discount the risks involved when using Wikipedia information compared to their female counterparts. Furthermore, male students had higher ratings than female students regarding most aspects of Wikipedia, including outcome expectations, perceptions about its information quality, belief in the Wikipedia project itself, emotional states while using Wikipedia, confidence in evaluating information quality, and further exploration. Finally, there was no gender difference regarding the number of years of Wikipedia use. However, male students reported having more positive experiences with the information quality of Wikipedia than their female counterparts. Overall, the findings of this study were consistent with those of previous studies concerning gender. Given the acknowledgment of the knowledge value of Wikipedia in recent literature, it seems that there are more advantages to using Wikipedia than there are disadvantages. The current study shows that male students seem to enjoy such benefits more than female students and may have more opportunities to develop their information literacy skills than female students by actively using Wikipedia. This suggests that educators need to encourage female students in particular to explore Wikipedia strategically as an initial information source so that they can develop their information literacy skills for unconventional sources. 相似文献
27.
28.
In a droplet transport based on electrowetting on dielectrics, the parallel-plate configuration is more popular than the single-plate one because the droplet transport becomes increasingly difficult without cover plate. In spite of the improved transport performance, the parallel-plate configuration often limits the access to the peripheral components, requesting the removal of the cover plate, the single-plate configuration. We investigated the fundamental features of droplet transport for the single-plate configuration. We compared the performance of several switching methods with respect to maximum speed of successive transport without failure and suggested nonfloating switching method which is inherently free from the charge-residue problem and exerts greater force on a droplet than conventional switching methods. A simple theory is provided to understand the different results for the switching methods. 相似文献
29.
The present study tested the hypothesis that maturing prefrontal lobes play a role in the development of proportional reasoning skill because the prefrontal lobes are involved in the inhibition of task‐irrelevant information and the representation of task‐relevant information. The hypothesis that reasoning development is in part dependent upon physical experience was also tested. Students (all males) who failed to solve a diagnostic proportions task were administered several tests of prefrontal lobe functions. The students were then randomly assigned to manipulative or verbal tutoring groups. Both groups received a series of individual testing, tutoring and testing sessions on proportional reasoning. As predicted, performance on the prefrontal lobe tasks (measures of inhibiting ability, planning ability, dissembedding ability, and working memory capacity) significantly predicted performance on proportional reasoning tasks following tutoring. Students' computational skills were not a significant predictor. Also, the manipulative group's proportional reasoning performance was significantly higher than that of the verbal tutoring group. Therefore, the present results provide support for the hypothesis that maturing prefrontal lobes and physical experience play roles in the development of proportional reasoning skill. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 1171–1182, 2000 相似文献
30.
Anton E. Lawson Brian Clark Erin Cramer‐Meldrum Kathleen A. Falconer Jeffrey M. Sequist Yong‐Ju Kwon 《科学教学研究杂志》2000,37(1):81-101
The primary purpose of the present study was to test the hypothesis that two general developmentally based levels of hypothesis‐testing skills exist. The first hypothesized level presumably involves skills associated with testing hypotheses about observable causal agents; the second presumably involves skills associated with testing hypotheses involving unobservable entities. To test this hypothesis, a hypothesis‐testing skills test was developed and administered to a large sample of college students both at the start and at the end of a biology course in which several hypotheses at each level were generated and tested. The predicted positive relationship between level of hypothesis‐testing skill and performance on a transfer problem involving the test of a hypothesis involving unobservable entities was found. The predicted positive relationship between level of hypothesis‐testing skill and course performance was also found. Both theoretical and practical implications of the findings are discussed. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 81–101, 2000 相似文献