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- 저자 : R. S. Walls (검색결과 5 건)
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M. Kloos,R. S. Walls 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
A novel cellular beam structure (CBS) intended for two to ten storey offi ce buildings has been developed by the Southern African Institute of Steel Construction (SAISC) which consists of prefabricated modules comprising of cellular steel beams encased in a multi-layered fl ooring system, which yields an innovative structure with many benefi ts, including reduced construction time and cost. However, a major obstacle to commercialisation is the unknown fi re resistance. Thus, this paper presents a series of non-linear fi nite element models that simulate the structural behaviour of the CBS under standard and parametric fi re conditions. The simulations include single structural elements in isolation and global structure models. Overall, it was found that the CBS performs satisfactorily in a fi re, provided that the integrity of the ceiling system can be maintained. However, signifi cant lateral defl ections up to 185 mm are predicted in a standard fi re, which threatens the integrity of the ceiling. Under parametric fi re conditions, a cooling phase suggests that there is negligible permanent deformation after a fi re, due to the fl exibility of the structure. Ultimately the results are used to make recommendations that: (a) steel end connections are designed to provide negligible moment restraint (b) slotted bolt holes are provided to allow free thermal expansion, and (c) the ceiling system is carefully detailed to accommodate the predicted lateral defl ections, thereby safeguarding the integrity.
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W. J. van Jaarsveldt,R. S. Walls,E. van der Klashorst 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
Negligible research has been conducted to date on how to analyse weakened columns, thus safety risks are still involved when structures are weakened prior to demolition. There are various methods available for demolishing steel structures. One of the most eff ective methods that has been developed involves pre-cutting steel columns at a certain height, so that the least eff ort can be used to collapse the structure by means of pulling out some of the columns. This paper presents (a) an experimental setup developed to test the capacity of axially loaded weakened columns, which is used to (b) validate a fi nite element (FE) model. The two pre-cuts that are presented in this paper are (1) the double window cut and (2) the triangular window cut, which are both commonly used in industry. A column weakened with a double window cut or triangular window cut reduces the axial load capacity by up to 50 and 40%, respectively. The FE models developed predict the axial failure load of weakened columns for a double window cut and triangular window cut are generally within an accuracy of less than 8 and 10%, respectively. It is shown at higher slendernesses the infl uence of column cuts is less than would be intuitively expected because global buckling becomes dominant.
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Video in the Web: Technical Challenges and Standardization
Soohong Park,Mannens, E,Walle, R V d,Soderberg, J,Adams, G,Hegaret, P L,Hong, C S IEEE 2010 IEEE multimedia Vol.17 No.4
<P>This column describes the current status of Web-based video in World Wide Web Consortium (W3C) standardization efforts. The new W3C specifications are designed to facilitate the cross-community integration of media objects, online media captioning, and temporal and spatial media fragments using uniform resource identifiers (URIs) designed to make video a first-class citizen on the Web.</P>
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Advanced Biomatrix Designs for Regenerative Therapy of Periodontal Tissues
Kim, J.H.,Park, C.H.,Perez, R.A.,Lee, H.Y.,Jang, J.H.,Lee, H.H.,Wall, I.B.,Shi, S.,Kim, H.W. SAGE Publications 2014 Journal of dental research Vol.93 No.12
<P>Periodontitis is an inflammatory disease that causes loss of the tooth-supporting apparatus, including periodontal ligament, cementum, and alveolar bone. A broad range of treatment options is currently available to restore the structure and function of the periodontal tissues. A regenerative approach, among others, is now considered the most promising paradigm for this purpose, harnessing the unique properties of stem cells. How to make full use of the body’s innate regenerative capacity is thus a key issue. While stem cells and bioactive factors are essential components in the regenerative processes, matrices play pivotal roles in recapitulating stem cell functions and potentiating therapeutic actions of bioactive molecules. Moreover, the positions of appropriate bioactive matrices relative to the injury site may stimulate the innate regenerative stem cell populations, removing the need to deliver cells that have been manipulated outside of the body. In this topical review, we update views on advanced designs of biomatrices—including mimicking of the native extracellular matrix, providing mechanical stimulation, activating cell-driven matrices, and delivering bioactive factors in a controllable manner—which are ultimately useful for the regenerative therapy of periodontal tissues.</P>
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Seo, Eun-Kyoung,Kim, Nam-Cheol,Wani, Mansukh C.,Wall, Monroe E.,Navarro, Herna'n A.,Burgess, Jason P.,Kazuko, Kawanishi,Kardono, Leonardus B.S.,Riswan, Soedarsono,Rose, William C.,Fairchild, Craig R. 梨花女子大學校 藥學硏究所 2002 藥學硏究論文集 Vol.- No.11
Six new xanthones, cratoxyarborenones A-F (1-6), were isolated from the leaves, twigs, and/or stembark of Cratosylum sumatranum along with the known compound, vismione B (9), as active constituentsby tioasbay-directed fraetionation using the KB human cancer cell line Wtotoxicity assay. In addition,two novel anthraquinobenzophenones, cratoxyarborequinones A (7) and B (8), and two Imown compounds,2,4,0-trihydroxybenzophenone 4-O-geranyl ether and δ-tocotrienol, were obtained as inactive constituents.
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