32,140 research outputs found

    Sheet forming simulations of automotive parts using different yield functions

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    In this work, the influence of the yield function on finite element (FE) forming simulation results for two auto-body panels, hood inner and door outer, was investigated. Simulations were conducted with different yield functions, Hill's1948. Yld91 and Yld2000-2d, which are available in the PAM-STAMP and LS-DYNA commercial codes. Although moderate, some differences in the results were observed.open111Nsciescopu

    Heterogeneity as the source of the state's resilience: the case of spatial planning under state-led neoliberalization in South Korea

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    Existing theories on the state and neoliberalism demonstrate that the state is resilient enough to restructure itself under neoliberalization of the economy. These theories, however, do not explain exactly how and why the state can be resilient. Using the case of spatial planning in South Korea around the turn of the millennium, when neoliberalism was an apparent consensus and the economy clearly was neoliberalized, this paper attempts to demonstrate that the source of the state's resilience is the heterogeneity of the neoliberal consensus. Neoliberalism, as a geographically and historically specific ideology in South Korea, combines political liberalism, economic conservatism, resistant regionalism, and localism. This heterogeneity within the neoliberal consensus in the ruling block allows the state to interpret neoliberalism in such a way that it can maintain a strong hold on its spatial economy by combining various spatial planning measures and simultaneously adjusting its spatial economy to accord with the neoliberalization of the global economy

    The Smart City as Time-Space Cartographer in COVID-19 Control: The South Korean Strategy and Democratic Control of Surveillance Technology

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    While the US, UK, France, Italy, and many other countries ended up implementing complete lockdown after tens of thousands of deaths from COVID-19, South Korea kept factories and offices running, flattened the curve, and maintained a low mortality rate. Extensive media coverage has focused on South Korea’s testing capacity as the primary reason, but there has been little discussion of the vital role of the smart city. In this paper, we describe how smart city technologies form a crucial part of disease control in South Korea, explain the social conditions for the extensive use of smart city technology, and offer critical insights into contemporary discussions on the issue of smart cities and surveillance

    Extraction of the beam elastic shape from uncertain FBG strain measurement points

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    Aim of the present paper is the analysis of the strain along the beam that is equipped with Glass Fibers Reinforced Polymers (GFRP) with an embedded set of optical Fiber Bragg Grating sensors (FBG), in the context of a project to equip with these new structural elements an Italian train bridge. Different problems are attacked, and namely: (i)during the production process [1] it is difficult to locate precisely the FBG along the reinforcement bar, therefore the following question appears: How can we associate the strain measurements to the points along the bar? Is it possible to create a signal analysis procedure such that this correspondence is found?(ii)the beam can be inflected and besides the strain at some points, we would like to recover the elastic shape of the deformed beam that is equipped with the reinforcement bars. Which signal processing do we use to determine the shape of the deformed beam in its inflection plane?(iii)if the beam is spatially inflected, in two orthogonal planes, is it possible to recover the beam spatial elastic shape? Object of the paper is to answer to these questions

    Photoluminescent characteristics of Ni-catalyzed GaN nanowires

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    The authors report on time-integrated and time-resolved photoluminescence (PL) of GaN nanowires grown by the Ni-catalyst-assisted vapor-liquid-solid method. From PL spectra of Ni-catalyzed GaN nanowires at 10 K, several PL peaks were observed at 3.472, 3.437, and 3.266 eV, respectively. PL peaks at 3.472 and 3.266 eV are attributed to neutral-donor-bound excitons and donor-acceptor pair, respectively. Furthermore, according to the results from temperature-dependent and time-resolved PL measurements, the origin of the PL peak at 3.437 eV is also discussed. (c) 2006 American Institute of Physics.X1147sciescopu

    Treatment of hilar cholangiocarcinoma (Klatskin tumors) with hepatic resection or transplantation

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    Background: Because of the rarity of hilar cholangiocarcinoma, its prognostic risk factors have not been sufficiently analyzed. This retrospective study was undertaken to evaluate various pathologic risk factors which influenced survival after curative hepatic resection or transplantation. Methods: Between 1981 and 1996, 72 patients (43 males and 29 females) with hilar cholangiocarcinoma underwent hepatic resection (34 patients) or transplantation (38 patients) with curative intent. Medical records and pathologic specimens were reviewed to examine the various prognostic risk factors. Survival was calculated by the method of Kaplan- Meier using the log rank test with adjustment for the type of operation. Survival statistics were calculated first for each kind of treatment separately, and then combined for the calculation of the final significance value. Results: Survival rates for 1, 3, and 5 years after hepatic resection were 74%, 34%, and 9%, respectively, and those after transplantation were 60%, 32%, and 25%, respectively. Univariate analysis revealed that T-3, positive lymph nodes, positive surgical margins, and pTNM stage III and IV were statistically significant poor prognostic factors. Multivariate analysis revealed that pTNM stage 0, I, and II, negative lymph node, and negative surgical margins were statistically significant good prognostic factors. For the patients in pTNM stage 0-II with negative surgical margins, 1-, 3-, and 5-year survivals were 80%, 73%, and 73%, respectively. For patients in pTNM stage IV-A with negative lymph nodes and surgical margins, 1-, 3-, and 5- year survivals were 66%, 37%, and 37%, respectively. Conclusions: Satisfactory longterm survivals can be obtained by curative surgery for hilar cholangiocarcinoma either with hepatic resection or liver transplantation. Redefining pTNM stage III and IV-A is proposed to better define prognosis
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