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A method for computing the visible regions of free-form surfaces is proposed in this paper. Our work is focused on accurately
calculating the visible regions of the sequenced rational Bézier surfaces forming a solid model and having coincident edges
but no inner-intersection among them. The proposed method calculates the silhouettes of the surfaces without tessellating
them into triangle meshes commonly used in previous methods so that arbitrary precision can be obtained. The computed silhouettes
of visible surfaces are projected onto a plane orthogonal to the parallel light. Then their spatial relationship is applied
to calculate the boundaries of mutual-occlusion regions. As the connectivity of the surfaces on the solid model is taken into
account, a surface clustering technique is also employed and the mutual-occlusion calculation is accelerated. Experimental
results showed that our method is efficient and robust, and can also handle complex shapes with arbitrary precision.
Project supported by the National Basic Research Program (973) of China (No. 2002CB312106) and the National Natural Science
Foundation of China (Nos. 60533070, and 60403047). The third author was supported by the project sponsored by a Foundation
for the Author of National Excellent Doctoral Dissertation of China (No. 200342) and a Program for New Century Excellent Talents
in University (No. NCET-04-0088), China 相似文献
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文章从单色光强的计算出发,探讨了光源的线度对干涉条纹可见度的影响。并以杨氏双缝干涉为例做定量分析,计算出了光源的临界宽度。 相似文献
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One aspect of lesbian/gay-parented families that merits attention is the coming out of the parents to their children. In the present study, we extended the current literature by exploring both the emotional and verbal responses of children who find out their parents are lesbian/gay. Findings showed that, while participants experienced a combination of negative, neutral, and positive reactions to learning about their parents’ sexual orientation, verbal reactions were limited to supportive messages and information seeking. Practical implications for lesbian/gay parented families and practitioners are included. 相似文献
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David J. Phillips 《The Information Society》1996,12(1):39-62
This article is an account of a Usenet newsgroup whose participants, in response to a perceived 'invasion' of 'barbarians,' explored and articulated the value of the group, the nature of the crisis facing it, and the strategies available to meet the crisis. The newsgroup facilitated political and personal support for some gay, lesbian, or bisexual men and women. The primary threat to the group was the increasing number of newcomers who were oblivious to established norms, who tended to view access to the group as a commodity, and who attempted to impose 'outside' paradigms on the operations of the group. Defensive strategies involved calling on rhetorical devices (such as flaming or ostracism) or structural resources (such as employers, network operators, or lawsuits). All strategies had the potential to backfire, but rhetorical strategies were less risky, more available, and more community affirming than strategies requiring access to structural resources. Through this account, the article addresses the mutual linkages and dependencies between the social and technical organization of computer-mediated communication (CMC) networks, the community-building activities taking place through those networks, and the social, legal, and economic structures in which those networks are embedded. 相似文献
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Sonja J. Ellis 《Higher Education》2009,57(6):723-739
The extent to which UK universities are ‘gay friendly’ has received some attention in the press. Whilst there are a number
of published studies exploring campus climate for lesbian, gay, bisexual and trans (LGBT) students and/or staff, these are
primarily localised studies undertaken in State Universities and Baccalaureate Colleges in the US. The present study is a
nationwide UK study of campus climate, based on survey data collected from a sample of 291 LGBT students from 42 universities
across the UK. The findings show that despite the increased implementation of an equality agenda (e.g. equal access; widening
participation) in UK Higher Education, homophobia on campus is still a significant problem and therefore universities are
not perceived nor experienced by LGBT students as ‘safe spaces’ in which to be open about sexual orientation/gender identity.
The implications of the findings for university policy and practice in relation to LGBT (and indeed all) students is also
explored. 相似文献
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Automatic web image annotation is a practical and effective way for both web image retrieval and image understanding. However, current annotation techniques make no further investigation of the statement-level syntactic correlation among the annotated words, therefore making it very difficult to render natural language interpretation for images such as ＂pandas eat bamboo＂. In this paper, we propose an approach to interpret image semantics through mining the visible and textual information hidden in images. This approach mainly consists of two parts： first the annotated words of target images are ranked according to two factors, namely the visual correlation and the pairwise co-occurrence; then the statement-level syntactic correlation among annotated words is explored and natural language interpretation for the target image is obtained. Experiments conducted on real-world web images show the effectiveness of the proposed approach. 相似文献
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Alex Kulick Laura J. Wernick Mario Alberto V. Espinoza Tarkington J. Newman Adrienne B. Dessel 《Sport, Education and Society》2013,18(9):939-953
ABSTRACTSchool-based sports and physical education play an important role in the development of youth (Jones, Edwards, et al., 2017), but participation in athletics is unequal for lesbian, gay, bisexual, transgender, and queer (LGBTQ) youth compared to their straight/cisgender peers [Greenspan, S. B., Griffith, C., & Murtagh, E. F. (2017). LGBTQ youths’ school athletic experiences: A 40-year content analysis in nine flagship journals. Journal of LGBT Issues in Counseling, 11(3), 190–200]. Sport cultures, generally, recreate dynamics of exclusion for marginalized youth. However, there are opportunities to transform these spaces into more inclusive and positive environments to support positive growth for all young people [Newman, T., Alvarez, A., & Kim, M. (2017). An experiential approach to sport-based positive youth development. Journal of Experiential Education, 40(3), 308–322]. Our study uses a data set of adolescents, collected as part of a community-based participatory action research project led by high school students in southeast Michigan, USA. Respondents reported their sexual and gender identities, as well as experiences in youth sport, as well as safety using sex-segregated facilities (i.e., bathrooms and locker-rooms). Using mediation models based on linear regression, we found evidence that LGBQ high school students play sports at a significantly lower rate compared to straight students, and among those who play sports, LGBTQ respondents felt significantly less safe compared to straight and cisgender students. Opposite to the LGBQ and trans youth in this study, straight/cisgender youth also reported feeling safer using all facilities. The mediation models suggest that these inequalities help to explain disparities in rates of sports participation and feelings of safety while participating. These findings have important implications for policy, practice, and future research. 相似文献
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《Journal of College Student Psychotherapy》2013,27(1):57-73
The present paper reviews critical issues involved in the learning and supervision of Short-Term Psychodynamic Psychotherapy (STPP). Though interest and demand for brief treatment formats has burgeoned, systematic instruction in these modalities is seen as minimal. While a college counseling center setting is particularly well suited for implementing brief dynamic therapy, there are a variety of training issues which must be addressed when learning this treatment modality. Aspects of STPP most commonly causing treatment dilemmas are highlighted. 相似文献