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        Shear center for elastic thin-walled composite beams

        Pollock, Gerry D.,Zak, Adam R.,Hilton, Harry H.,Ahmad, M. Fouad Techno-Press 1995 Structural Engineering and Mechanics, An Int'l Jou Vol.3 No.1

        An analysis to determine shear centers for anisotropic elastic thin-walled composite beams, cantilevered and loaded transversely at the free end is presented. The shear center is formulated based on familiar strength of material procedures analogous to those for isotropic beams. These procedures call for a balancing of torsional moments on the cross sectional surface and lead to a condition of zero resultant torsional couple. As a consequence, due the presence of anisotropic coupling, certain non-classical effects are manifested and are illustrated in two example problems. The most distinguishing result is that twisting may occur for composite beams even if shear forces are applied at the shear center. The derived shear center locations do not depend on any specific anisotropic bending theories per se, but only on the values of bending and shear stresses which such theories produce.

      • SSCISCOPUSKCI등재

        Three Essays on Trauma and Shame : Feminist Perspectives on Visual Poetics

        POLLOCK, Griselda Ewha Womans University Press 2006 Asian Journal of Women's Studies(AJWS) Vol.12 No.4

        Can we die from shame? In what way is shame a feminist issue? How have contemporary artists explored the theme? Prompted by a news item that reported the death of a leading Korean actress, which was attributed to the shame of a role she had played in a recent movie, The Scarlet Letter, this article explores shame initially through a re-reading of Sigmund Freud’s challenging theory of sexuality (1905) in which he plots out the ways in which shame and disgrace come into being and specifically inflect the social management of women’s adult sexuality. It then offers three case studies of ways in which contemporary artists from South Africa, Zanzibar/UK and Israel/France have explored aspects of historically created shame (apartheid and truth/reconciliation, enslavement, genocide and the Holocaust) through a variety of forms of art practice, not to submit their subjects to re-shaming, but to challenge the world to be ashamed of what has been done to diminish the humanity of those who are othered for gender, ethnicity, religion.

      • KCI등재

        Three Essays on Trauma and Shame: Feminist Perspectives on Visual Poetics

        Griselda POLLOCK 이화여자대학교 아시아여성학센터 2006 Asian Journal of Women's Studies(AJWS) Vol.12 No.4

        Can we die from shame? In what way is shame a feminist issue? How have contemporary artists explored the theme? Prompted by a news item that reported the death of a leading Korean actress, which was attributed to the shame of a role she had played in a recent movie, The Scarlet Letter, this article explores shame initially through a re-reading of Sigmund Freud’s challenging theory of exuality (1905) in which he plots out the ways in which shame and disgrace come into being and specifically inflect the social management of women’s adult sexuality. It then offers three case studies of ways in which contemporary artists from South Africa, Zanzibar/UK and Israel/France have explored aspects of historically created shame (apartheid and truth/reconciliation, enslavement, genocide and the Holocaust) through a variety of forms of art practice, not to submit their subjects to re-shaming, but to challenge the world to be ashamed of what has been done to diminish the humanity of those who are othered for gender, ethnicity, religion.

      • KCI등재

        Current Status of Endoscopic Vacuum Therapy in the Management of Esophageal Perforations and Post-Operative Leaks

        Imogen Livingstone,Lily Pollock,Bruno Sgromo,Sotiris Mastoridis 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.6

        Esophageal wall defects, including perforations and postoperative leaks, are associated with high morbidity and mortality and posea significant management challenge. In light of the high morbidity of surgical management or revision, in recent years, endoscopicvacuum therapy (EVT) has emerged as a novel alternative treatment strategy. EVT involves transoral endoscopic placement of apolyurethane sponge connected to an externalized nasogastric tube to provide continuous negative pressure with the intention ofpromoting defect healing, facilitating cavity drainage, and ameliorating sepsis. In the last decade, EVT has become increasinglyadopted in the management of a diverse spectrum of esophageal defects. Its popularity has been attributed in part to the growingbody of evidence suggesting superior outcomes and defect closure rates in excess of 80%. This growing body of evidence, coupledwith the ongoing evolution of the technology and techniques of deployment, suggests that the utilization of EVT has becomeincreasingly widespread. Here, we aimed to review the current status of the field, addressing the mechanism of action, indications,technique methodology, efficacy, safety, and practical considerations of EVT implementation. We also sought to highlight futuredirections for the use of EVT in esophageal wall defects.

      • Formation of [3]Catenanes from 10 Precursors via Multicomponent Coordination-Driven Self-Assembly of Metallarectangles

        Li, Shijun,Huang, Jianying,Cook, Timothy R.,Pollock, J. Bryant,Kim, Hyunuk,Chi, Ki-Whan,Stang, Peter J. American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.6

        <P>We describe the formation of a suite of [3]catenanes via multicomponent coordination-driven self-assembly and host–guest complexation of a rectangular scaffold comprising a 90° Pt-based acceptor building block with a pseudorotaxane bis(pyridinium)ethane/dibenzo-24-crown-8 linear dipyridyl ligand and three dicarboxylate donors. The doubly threaded [3]catenanes are formed from a total of 10 molecular components from four unique species. Furthermore, the dynamic catenation process is reversible and can be switched off and on in a controllable manner by successive addition of KPF<SUB>6</SUB> and 18-crown-6, as monitored by <SUP>1</SUP>H and <SUP>31</SUP>P NMR spectroscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-6/ja3118812/production/images/medium/ja-2012-118812_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3118812'>ACS Electronic Supporting Info</A></P>

      • KCI등재후보

        Percutaneous transhepatic access to allow per-oral enteric stent insertion for malignant duodenal obstruction following failed endoscopic attempt

        Renan E. Ibrahem Adam,Peter Thurley,Graham Pollock 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.4

        The treatment options for malignant gastric outlet obstruction include antegrade stent placement or surgical bypass, the latter being associated with a higher level of morbidity and therefore often reserved for cases in which stenting is not technically possible. Antegrade stent placement can be endoscopic, fluoroscopic or a combination. We report a case in which standard antegrade attempts at stenting failed, but where it was possible to use a retrograde approach via the biliary tree to facilitate technically and clinically successful stent placement.

      • KCI등재

        Acoustic Characteristics of Adults' Rhotic Monophthongs and Diphthongs

        정현주(Hyunju Chung),Karen E. Pollock 한국언어청각임상학회 2014 Communication Sciences and Disorders Vol.19 No.1

        배경 및 목적: 치경접근음은 일반적으로 습득이 어려운 음성 중 하나로 알려져 있음에도 불구하고 이에 관한 연구는 상대적으로 많지 않다. 특히 치경접근 자음에 비해 치경접근 모음의 연구, 심지어 성인 대상의 연구 중에도 치경접근 모음에 관한 연구는 찾기 어렵다. 이에 본 연구는 특정 음성환경이 치경접근 단모음과 이중모음 산출에 영향을 미치는지, 따라서 조음 습득에 더 용이한 환경을 제공하는 지를 음향학적 분석을 통해 살펴보았다. 방법: 서부 캐나다 영어를 모국어로 쓰는 10명의 여성 성인 화자로부터 폐음절 또는 개음절 내 2종류의 치경접근 단모음과 4종류의 치경접근 이중모음을 포함한 36개의 목표단어를 채취하여, 각 모음의 F2, F3 및 모음 길이를 분석하였다. 결과: 치경접근 단모음과 이중모음 중 치경접근음 앞에 전설모음이 오는 경우 지속적으로 낮은 F3-F2 패턴을 보인 반면, 후설모음이 오는 경우 상대적으로 경사진 하향 패턴을 보였다. [ɝ] 모음이 [ɚ]에 비해 길이가 긴 것을 제외하면, 강세여부가 다른 두 종류의 치경접근 단모음에서는 뚜렷한 음향학적 차이를 찾아볼 수 없었다. 네 종류의 치경접근 이중모음 또한 뚜렷한 모음길이 차이를 보이지 않았다. 논의 및 결론: 여섯 종류 치경접근모음의 음향학적 차이는 특정 음성환경이 보다 더 뚜렷한 음향적 단서를 제공함으로 음성 습득에 보다 용이한 음성 환경을 제공해줄 수 있다는 것을 보여주었다. Objectives: Rhotic sounds are known to be among the later developed sounds in young children, especially for those with speech sound disorders. Despite this fact, not many studies have examined the characteristics of rhotic vowels. Adults' productions of rhotic vowels have not been well investigated in spite of a relatively large literature on rhotic consonants. This study examined the acoustic characteristics of rhotic monophthongs and diphthongs to see if certain phonetic contexts require less demanding articulatory movements or are different in vowel duration from other contexts, and thus work as a facilitating context for the acquisition of rhotic vowels. Methods: Ten monolingual female adult speakers of Western Canadian English produced 36 target words containing two rhotic monophthongs ([ɝ] and [ɚ]), and four rhotic diphthongs (/ɪ͡ɚ/, /ɛ͡ɚ/, /ɔ͡ɚ/, and /ɑ͡ɚ/) in both open and closed syllables. Acoustic analyses were performed to extract F2 and F3 values across the vowel duration, as well as the duration for each vowel. Results: Constantly low F3-F2 values were found for rhotic monophthongs and rhotic diphthongs with front pre-rhotic vowels, but steeper downward movement was found for rhotic diphthongs with back pre-rhotic vowels. Stressed and unstressed rhotic monophthongs showed similar acoustic patterns, except for [ɝ] which was slightly longer than [ɚ]. Across four rhotic diphthongs, no clear durational difference was found. Conclusion: Differences in acoustic patterns by phonetic contexts across six different rhotic vowel types suggest that certain phonetic contexts could provide more salient perceptual cues and thus facilitate relatively easier mastery of sounds over others for young children.

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