16,675 research outputs found
Effects of glucose level on early and long-term mortality after intracerebral haemorrhage: the Acute Brain Bleeding Analysis Study
No full textAdmission hyperglycaemia is associated with a poor outcome in patients with ischaemic stroke. However, its prognostic effects after intracerebral haemorrhage (ICH) are still unclear. We prospectively enrolled patients with ICH at 33 centres in Korea between October 2002 and March 2004. A total of 1,387 patients who had ICH and underwent brain computed tomography within 48 h of symptom onset were included in the study (n = 1,387). Clinical information and radiological findings were collected at admission. Glucose levels were examined in relation to early (up to 30 days after ictus) and long-term (after 30 days) mortality rates using Cox regression analysis. To eliminate short-term effects, long-term mortality rate analysis was performed on surviving patients for more than 30 days. The long-term mortality rate was 21.1% after a mean follow-up of 434.3 +/- 223.2 days and was found to increase significantly with glucose quartile (p < 0.001). Admission glucose level was an independent risk factor for early mortality (per mmol/l; adjusted HR 1.10 [95% CI 1.01-1.19]), but not for long-term mortality. Moreover, when analysis was restricted to patients without diabetes, glucose level was found to be an independent risk factor for post-ICH mortality (n = 1,119; adjusted HR 1.10 [95% CI 1.03-1.17]) and had marginal significance for early (p = 0.053) and long-term mortality (p = 0.09). We found that admission glucose levels were associated with early mortality after ICH. In patients without diabetes, admission glucose levels were associated with long-term mortality. We therefore suggest that intensive lowering of glucose level should be further investigated in ICH patients.Godoy DA, 2008, NEUROCRIT CARE, V9, P217, DOI 10.1007/s12028-008-9063-1Huang BR, 2008, INTERN MED J, V38, P568, DOI 10.1111/j.1445-5994.2007.01536.xGray CS, 2007, LANCET NEUROL, V6, P397, DOI 10.1016/S1474-4422(07)70080-7Yoon BW, 2007, NEUROLOGY, V68, P146, DOI 10.1212/01.wnl.0000250351.38999.f2Fogelholm R, 2005, J NEUROL NEUROSUR PS, V76, P349, DOI 10.1136/jnnp.2003.034819Passero S, 2003, NEUROLOGY, V61, P1351Song EC, 2003, STROKE, V34, P2215, DOI 10.1161/01.STR.0000088060.83709.2CCheung RTF, 2003, STROKE, V34, P1717, DOI 10.1161/01.STR.0000078657.22835.B9Megherbi SE, 2003, STROKE, V34, P688, DOI 10.1161/01.STR.0000057975.15221.40Slowik A, 2002, J NEUROL SCI, V196, P27Van den Berghe G, 2001, NEW ENGL J MED, V345, P1359Capes SE, 2001, STROKE, V32, P2426Hemphill JC, 2001, STROKE, V32, P891Arboix A, 2000, DIABETES CARE, V23, P1527Gabir MM, 2000, DIABETES CARE, V23, P1108Gong C, 2000, BRAIN RES, V871, P57Weir CJ, 1997, BRIT MED J, V314, P1303MASE G, 1995, ACTA NEUROL SCAND, V91, P306VANKOOTEN F, 1993, STROKE, V24, P1129FRANKE CL, 1992, J NEUROL NEUROSUR PS, V55, P653ARAKI N, 1992, J CEREBR BLOOD F MET, V12, P469TUHRIM S, 1991, ANN NEUROL, V29, P658OPPENHEIMER SM, 1985, BRIT MED J, V291, P1014CHAN PH, 1984, NEUROLOGY, V34, P315MELAMED E, 1976, J NEUROL SCI, V29, P2671
Mesh regularization in sheet metal forming of auto-body members for crashworthiness assessment
No full textA mesh regularization method is newly proposed in order to enhance the efficiency of finite element analyses in sheet metal forming. The mesh regularization method automatically finds out distorted elements with searching criteria proposed and composes patches to be modified. Each patch is, then, extended to three-dimensional surfaces in order to obtain the information of the continuous coordinates. The surface enclosing each patch is described as a three-dimensional free surface with the use of NURBS(Non-Uniform rational B Spline). On the basis of the constructed surface, each node is properly arranged to compose regular elements that have almost same length of sides and near right angles at the corner. Various numerical analyses have been carried out to confirm the efficiency of the mesh regularization method proposed and the accuracy of the result. It is also noted that the present method is effective in the structural or crash analyses of sheet metal members obtained from the forming simulation. The present approach directly applies the simulation result to the crash analysis while the crash analysis model is usually reconstructed from the result of the forming simulation by mapping the state variables in other analysis procedures
The Cyclic Banyan Network : A Fault Toerlant Multistage Interconnection Network with the Fully-Adaptive Self-routing
No full textThe Effects of Two-Stage Fuel Injection on Dimethyl-ether (DME) Homogeneous Charge Compression Ignition Engine Combustion
No full textThis study was sponsored by Combustion Engineering Research Center (CERC), KAIST and the office of KAIST EEWS Initiative (EEWS: Energy, Environment, Water, and Sustainability)
Hydrogen homogeneous charge compression ignition (HCCI) engine with DME as an ignition promoter
No full textThis study was sponsored by the office of KAIST EEWS institute (EEWS: Energy, environment, water, and sustainability
A practical approach of ID-based cryptosystem in ad hoc networks
No full textAs research in ad hoc networking has advanced, the importance of security increases more and more. But it suffers from the restriction that ad hoc networks do not have the established infrastructure. In this paper we propose a security-enhanced model with ID-based cryptosystem which removes the necessity for any infrastructure and provides sound authentication. Also we provide a more secure and concrete routing protocol with aggregate signature. For confidentiality, we also provide a key exchange protocol. And our model not only distributes the role of key generation center in ID-based cryptosystem to the nodes with threshold cryptography, but also increases availability by providing a secret re-sharing protocol. Therefore, our model is very appropriate for ad hoc networks. Copyright (c) 2007 John Wiley & Sons, Ltd
Secure and Efficient Routing Protocol in Ad Hoc Network with ID-Based Aggregate Signature
No full textAutomated multi-target tracking with kinematic and non-kinematic information
No full textThe authors address an automated multi-target tracking (MTT) problem. In particular, our study is focused on robust data association considering an additional feature and the reliable track management by avoiding track duplications. As the additional feature, the amplitude information is combined with position measurements to improve the performance of the data association so as to effectively distinguish target-originated measurements from clutters. Because of its form of signal-to-noise ratio (SNR), which is often fluctuated according to targets' aspect and effective radar cross section, the usage of the amplitude information is not straightforward. To reduce the certain level of uncertainty of the SNR, the authors propose the SNR estimation algorithm. Moreover, the authors avoid the track duplication problem to achieve the reliability of track maintenance. Specifically, the authors solve the problem by exploiting well-known mean shift algorithm to merge duplications into appropriate clusters. Simulation results demonstrate the effectiveness and high estimation accuracy of the proposed MTT filter compared to existing methods. © 2012 The Institution of Engineering and Technology
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