327 research outputs found
The effect of long-term care public benefits and insurance on informal care from outside the household: Empirical evidence from Italy and Spain
This article uses cross-sectional data from the Survey of Health, Ageing, and Retirement in Europe (SHARE) database to test the effect of both long-term care (LTC) public benefits and insurance on the receipt of informal care provided by family members living outside the household in Italy and Spain. The choice of Italy and Spain comes from the fact that informal care is rather similar in these two countries while their respective public LTC financing systems are different. Our results support the hypothesis of LTC public support decreasing the receipt of informal care for Spain while reject it for Italy. They tend to confirm that the effect of public benefits on informal care depends on the typology of public coverage for LTC whereby access to proportional benefits negatively influences informal care receipt while access to cash benefits exerts a positive effect. Our results also suggest that private LTC insurance complements the public LTC financing system in place
Level set implementation for the simulation of anisotropic etching: application to complex MEMS micromachining
The use of atomistic methods, such as the continuous cellular automaton (CCA), is currently regarded as an accurate and efficient approach for the simulation of anisotropic etching in the development of micro-electro-mechanical systems (MEMS). However, whenever the targeted etching condition is modified (e. g. by changing the substrate material, etchant type, concentration and/or temperature) this approach requires performing a time-consuming recalibration of the full set of internal atomistic rates defined within the method. Based on the level set (LS) approach as an alternative and using the experimental data directly as input, we present a fully operational simulator that exhibits similar accuracy to the latest CCA models. The proposed simulator is tested by describing a wide range of silicon and quartz MEMS structures obtained in different etchants through complex processes, including double-sided etching as well as different mask patterns during different etching steps and/or simultaneous masking materials on different regions of the substrate. The results demonstrate that the LS method is able to simulate anisotropic etching for complex MEMS processes with similar computational times and accuracy as the atomistic models.This work has been supported by the Spanish FPI-MICINN BES-2011-045940 grant and the Ramon y Cajal Fellowship Program by the Spanish Ministry of Science and Innovation. Also, we acknowledge support by the JAE-Doc grant from the Junta para la Ampliacion de Estudios program co-funded by FSE and the Professor Partnership Program by NVIDIA Corporation.Montoliu, C.; Ferrando Jódar, N.; Gosalvez Ayuso, MA.; Cerdá Boluda, J.; Colom Palero, RJ. (2013). Level set implementation for the simulation of anisotropic etching: application to complex MEMS micromachining. Journal of Micromechanics and Microengineering. 23(7). https://doi.org/10.1088/0960-1317/23/7/075017S237Weirauch, D. F. (1975). Correlation of the anisotropic etching of single−crystal silicon spheres and wafers. Journal of Applied Physics, 46(4), 1478-1483. doi:10.1063/1.321787Seidel, H. (1990). Anisotropic Etching of Crystalline Silicon in Alkaline Solutions. Journal of The Electrochemical Society, 137(11), 3612. doi:10.1149/1.2086277Zielke, D., & Frühauf, J. (1995). Determination of rates for orientation-dependent etching. Sensors and Actuators A: Physical, 48(2), 151-156. doi:10.1016/0924-4247(95)00993-0Wind, R. A., & Hines, M. A. (2000). Macroscopic etch anisotropies and microscopic reaction mechanisms: a micromachined structure for the rapid assay of etchant anisotropy. Surface Science, 460(1-3), 21-38. doi:10.1016/s0039-6028(00)00479-9Gosálvez, M. A., Sato, K., Foster, A. S., Nieminen, R. M., & Tanaka, H. (2007). An atomistic introduction to anisotropic etching. Journal of Micromechanics and Microengineering, 17(4), S1-S26. doi:10.1088/0960-1317/17/4/s01Sato, K., Shikida, M., Matsushima, Y., Yamashiro, T., Asaumi, K., Iriye, Y., & Yamamoto, M. (1998). Characterization of orientation-dependent etching properties of single-crystal silicon: effects of KOH concentration. Sensors and Actuators A: Physical, 64(1), 87-93. doi:10.1016/s0924-4247(97)01658-0Zubel, I., & Kramkowska, M. (2002). The effect of alcohol additives on etching characteristics in KOH solutions. Sensors and Actuators A: Physical, 101(3), 255-261. doi:10.1016/s0924-4247(02)00265-0Charbonnieras, A. R., & Tellier, C. R. (1999). Characterization of the anisotropic chemical attack of {hk0} silicon plates in a T.M.A.H. solution. Sensors and Actuators A: Physical, 77(2), 81-97. doi:10.1016/s0924-4247(99)00020-5Shikida, M., Sato, K., Tokoro, K., & Uchikawa, D. (2000). Differences in anisotropic etching properties of KOH and TMAH solutions. Sensors and Actuators A: Physical, 80(2), 179-188. doi:10.1016/s0924-4247(99)00264-2Gosálvez, M. A., Zubel, I., & Viinikka, E. (2010). Wet Etching of Silicon. Handbook of Silicon Based MEMS Materials and Technologies, 375-407. doi:10.1016/b978-0-8155-1594-4.00024-3Pal, P., Gosalvez, M. A., & Sato, K. (2010). Silicon Micromachining Based on Surfactant-Added Tetramethyl Ammonium Hydroxide: Etching Mechanism and Advanced Applications. Japanese Journal of Applied Physics, 49(5), 056702. doi:10.1143/jjap.49.056702Zubel, I., & Kramkowska, M. (2004). Etch rates and morphology of silicon (h k l) surfaces etched in KOH and KOH saturated with isopropanol solutions. Sensors and Actuators A: Physical, 115(2-3), 549-556. doi:10.1016/j.sna.2003.11.010Fruhauf, J., Trautmann, K., Wittig, J., & Zielke, D. (1993). A simulation tool for orientation dependent etching. Journal of Micromechanics and Microengineering, 3(3), 113-115. doi:10.1088/0960-1317/3/3/004Than, O., & Büttgenbach, S. (1994). Simulation of anisotropic chemical etching of crystalline silicon using a cellular automata model. Sensors and Actuators A: Physical, 45(1), 85-89. doi:10.1016/0924-4247(94)00820-5Camon, H., Gue, A. M., Danel, J. S., & Djafari-Rouhani, M. (1992). Modelling of anisotropic etching in silicon-based sensor application. Sensors and Actuators A: Physical, 33(1-2), 103-105. doi:10.1016/0924-4247(92)80237-wGosalvez, M. ., Nieminen, R. ., Kilpinen, P., Haimi, E., & Lindroos, V. (2001). Anisotropic wet chemical etching of crystalline silicon: atomistic Monte-Carlo simulations and experiments. Applied Surface Science, 178(1-4), 7-26. doi:10.1016/s0169-4332(01)00233-1Zhenjun Zhu, & Chang Liu. (2000). Micromachining process simulation using a continuous cellular automata method. Journal of Microelectromechanical Systems, 9(2), 252-261. doi:10.1109/84.846706Gosalvez, M. A., Yan Xing, & Sato, K. (2008). Analytical Solution of the Continuous Cellular Automaton for Anisotropic Etching. Journal of Microelectromechanical Systems, 17(2), 410-431. doi:10.1109/jmems.2008.916339Ferrando, N., Gosálvez, M. A., Cerdá, J., Gadea, R., & Sato, K. (2011). Faster and exact implementation of the continuous cellular automaton for anisotropic etching simulations. Journal of Micromechanics and Microengineering, 21(2), 025021. doi:10.1088/0960-1317/21/2/025021Ferrando, N., Gosálvez, M. A., Cerdá, J., Gadea, R., & Sato, K. (2011). Octree-based, GPU implementation of a continuous cellular automaton for the simulation of complex, evolving surfaces. Computer Physics Communications, 182(3), 628-640. doi:10.1016/j.cpc.2010.11.004Moktadir, Z., & Camon, H. (1997). Monte Carlo simulation of anisotropic etching of silicon: investigation of surface properties. Modelling and Simulation in Materials Science and Engineering, 5(5), 481-488. doi:10.1088/0965-0393/5/5/004Flidr, J., Huang, Y.-C., & Hines, M. A. (1999). An atomistic mechanism for the production of two- and three-dimensional etch hillocks on Si(111) surfaces. The Journal of Chemical Physics, 111(15), 6970-6981. doi:10.1063/1.479990Gos lvez, M. A., & Nieminen, R. M. (2003). Surface morphology during anisotropic wet chemical etching of crystalline silicon. New Journal of Physics, 5, 100-100. doi:10.1088/1367-2630/5/1/400Xing, Y., Gosálvez, M. A., Sato, K., Tian, M., & Yi, H. (2012). Evolutionary determination of kinetic Monte Carlo rates for the simulation of evolving surfaces in anisotropic etching of silicon. Journal of Micromechanics and Microengineering, 22(8), 085020. doi:10.1088/0960-1317/22/8/085020Xing, Y., Gosálvez, M. A., Sato, K., & Yi, H. (2009). Orientation-dependent surface morphology of crystalline silicon during anisotropic etching using a continuous cellular automaton. Journal of Micromechanics and Microengineering, 20(1), 015019. doi:10.1088/0960-1317/20/1/015019Zhou, Z., Huang, Q., Li, W., & Deng, W. (2007). A cellular automaton-based simulator for silicon anisotropic etching processes considering high index planes. Journal of Micromechanics and Microengineering, 17(4), S38-S49. doi:10.1088/0960-1317/17/4/s03Gosálvez, M. A., Xing, Y., Sato, K., & Nieminen, R. M. (2009). Discrete and continuous cellular automata for the simulation of propagating surfaces. Sensors and Actuators A: Physical, 155(1), 98-112. doi:10.1016/j.sna.2009.08.012Ferrando, N., Gosálvez, M. A., & Colóm, R. J. (2012). Evolutionary continuous cellular automaton for the simulation of wet etching of quartz. Journal of Micromechanics and Microengineering, 22(2), 025021. doi:10.1088/0960-1317/22/2/025021Osher, S., & Sethian, J. A. (1988). Fronts propagating with curvature-dependent speed: Algorithms based on Hamilton-Jacobi formulations. Journal of Computational Physics, 79(1), 12-49. doi:10.1016/0021-9991(88)90002-2Adalsteinsson, D., & Sethian, J. A. (1995). A Level Set Approach to a Unified Model for Etching, Deposition, and Lithography I: Algorithms and Two-Dimensional Simulations. Journal of Computational Physics, 120(1), 128-144. doi:10.1006/jcph.1995.1153Adalsteinsson, D., & Sethian, J. A. (1995). A Level Set Approach to a Unified Model for Etching, Deposition, and Lithography II: Three-Dimensional Simulations. Journal of Computational Physics, 122(2), 348-366. doi:10.1006/jcph.1995.1221Adalsteinsson, D., & Sethian, J. A. (1997). A Level Set Approach to a Unified Model for Etching, Deposition, and Lithography. Journal of Computational Physics, 138(1), 193-223. doi:10.1006/jcph.1997.5817Ertl, O., & Selberherr, S. (2009). A fast level set framework for large three-dimensional topography simulations. Computer Physics Communications, 180(8), 1242-1250. doi:10.1016/j.cpc.2009.02.002Ertl, O., & Selberherr, S. (2010). Three-dimensional level set based Bosch process simulations using ray tracing for flux calculation. Microelectronic Engineering, 87(1), 20-29. doi:10.1016/j.mee.2009.05.011Burzynski, T., & Papini, M. (2010). Level set methods for the modelling of surface evolution in the abrasive jet micromachining of features used in MEMS and microfluidic devices. Journal of Micromechanics and Microengineering, 20(8), 085004. doi:10.1088/0960-1317/20/8/085004Radjenović, B., Lee, J. K., & Radmilović-Radjenović, M. (2006). Sparse field level set method for non-convex Hamiltonians in 3D plasma etching profile simulations. Computer Physics Communications, 174(2), 127-132. doi:10.1016/j.cpc.2005.09.010Radjenović, B., Radmilović-Radjenović, M., & Mitrić, M. (2006). Nonconvex Hamiltonians in three dimensional level set simulations of the wet etching of silicon. Applied Physics Letters, 89(21), 213102. doi:10.1063/1.2388860Branislav, R., & Marija, R.-R. (2010). Level set simulations of the anisotropic wet etching process for device fabrication in nanotechnologies. Hemijska industrija, 64(2), 93-97. doi:10.2298/hemind100205008rRadjenović, B., Radmilović-Radjenović, M., & Mitrić, M. (2010). Level Set Approach to Anisotropic Wet Etching of Silicon. Sensors, 10(5), 4950-4967. doi:10.3390/s100504950Radjenović, B., & Radmilović-Radjenović, M. (2011). Three-Dimensional Simulations of the Anisotropic Etching Profile Evolution for Producing Nanoscale Devices. Acta Physica Polonica A, 119(3), 447-450. doi:10.12693/aphyspola.119.447Crandall, M. G., & Lions, P.-L. (1984). Two approximations of solutions of Hamilton-Jacobi equations. Mathematics of Computation, 43(167), 1-1. doi:10.1090/s0025-5718-1984-0744921-8Whitaker, R. T. (1998). International Journal of Computer Vision, 29(3), 203-231. doi:10.1023/a:1008036829907Gomes, J., & Faugeras, O. (2000). Reconciling Distance Functions and Level Sets. Journal of Visual Communication and Image Representation, 11(2), 209-223. doi:10.1006/jvci.1999.0439Fukuzawa, K., Terada, S., Shikida, M., Amakawa, H., Zhang, H., & Mitsuya, Y. (2007). Mechanical design and force calibration of dual-axis micromechanical probe for friction force microscopy. Journal of Applied Physics, 101(3), 034308. doi:10.1063/1.2434825Schröpfer, G., Labachelerie, M. de, Ballandras, S., & Blind, P. (1998). Collective wet etching of a 3D monolithic silicon seismic mass system. Journal of Micromechanics and Microengineering, 8(2), 77-79. doi:10.1088/0960-1317/8/2/008Wilke, N., Reed, M. L., & Morrissey, A. (2006). The evolution from convex corner undercut towards microneedle formation: theory and experimental verification. Journal of Micromechanics and Microengineering, 16(4), 808-814. doi:10.1088/0960-1317/16/4/018Liang, J., Kohsaka, F., Matsuo, T., & Ueda, T. (2007). Wet Etched High Aspect Ratio Microstructures on Quartz for MEMS Applications. IEEJ Transactions on Sensors and Micromachines, 127(7), 337-342. doi:10.1541/ieejsmas.127.337Hida, H., Shikida, M., Fukuzawa, K., Murakami, S., Sato, K., Asaumi, K., … Sato, K. (2008). Fabrication of a quartz tuning-fork probe with a sharp tip for AFM systems. Sensors and Actuators A: Physical, 148(1), 311-318. doi:10.1016/j.sna.2008.08.02
Application of the level set method for the visual representation of continuous cellular automata oriented to anisotropic wet etching
[EN] Atomistic models are a very valuable simulation tool in the field of material science. Among them are the continuous cellular automata (CCA), which can simulate accurately the process of chemical etching used in micro-electro-mechanical-systems (MEMS) micromachining. Due to the CCA intrinsic atomistic nature, simulation results are obtained in the form of a cloud of points, so data visualization has been usually problematic. When using these models as a part of a computer aided design tool, good data visualization is very important. In this paper, a minimum energy model implemented with the level set (LS) method for improving the visual representation of simulated MEMS is presented. Additionally, the sparse field method has been applied to reduce the high computational cost of the original LS. Finally, some reconstructed surfaces with completely different topologies are presented, proving the effectiveness of our implementation and the fact that it is capable of producing any real surface, flat and smooth ones.We thank Miguel Angel Gosalvez for his collaboration in the early stages of this research. This work has been supported by the Spanish FPI-MICINN BES-2011-045940 grant. Also, we acknowledge support by the JAE-Doc grant form the Junta para la Ampliacion de Estudios program co-funded by FSE.Montoliu Álvaro, C.; Ferrando Jódar, N.; Cerdá Boluda, J.; Colom Palero, RJ. (2014). Application of the level set method for the visual representation of continuous cellular automata oriented to anisotropic wet etching. International Journal of Computer Mathematics. 91(1):124-134. https://doi.org/10.1080/00207160.2013.801464S12413491
Spatiotemporal correlations of handset-based service usages
We study spatiotemporal correlations and temporal diversities of
handset-based service usages by analyzing a dataset that includes detailed
information about locations and service usages of 124 users over 16 months. By
constructing the spatiotemporal trajectories of the users we detect several
meaningful places or contexts for each one of them and show how the context
affects the service usage patterns. We find that temporal patterns of service
usages are bound to the typical weekly cycles of humans, yet they show maximal
activities at different times. We first discuss their temporal correlations and
then investigate the time-ordering behavior of communication services like
calls being followed by the non-communication services like applications. We
also find that the behavioral overlap network based on the clustering of
temporal patterns is comparable to the communication network of users. Our
approach provides a useful framework for handset-based data analysis and helps
us to understand the complexities of information and communications technology
enabled human behavior.Comment: 11 pages, 15 figure
Improvement of cardiometabolic markers after fish oil intervention in young Mexican adults and the role of PPARα L162V and PPARγ2 P12A
Polyunsaturated fatty acids (PUFA) contained in fish oil (FO) are ligands for peroxisome proliferator-activated receptors (PPAR) that may induce changes in cardiometabolic markers. Variation in PPAR genes may influence the beneficial responses linked to FO supplementation in young adults. The study aimed to analyze the effect of FO supplementation on glucose metabolism, circulating lipids and inflammation according to PPARα L162V and PPARγ2 P12A genotypes in young Mexican adults. 191 young, non-smoking subjects between 18 and 40 years were included in a one-arm study. Participants were supplemented with 2.7 g/day of EPA+DHA, during six weeks. Dietary analysis, body composition measurements and indicators for glucose metabolism, circulating lipids, and markers for inflammation were analyzed before and after intervention. An overall decrease in triglycerides (TG) and an increase in HS-ω3 index were observed in all subjects [-4.1 mg/dL, (SD:±51.7), P=.02 and 2.6%, (SD:±1.2), P\u3c.001 respectively]. Mean fasting insulin and glycated hemoglobin (HbA1c%) were significantly decreased in all subjects [-0.547mlU/L, (SD:±10.29), P=.034 and-0.07%, (SD:±0.3), P\u3c.001 respectively], whereas there was no change in body composition, fasting glucose, adiponectin and inflammatory markers. Subjects carrying the minor alleles of PPARα L162V and PPARγ2 P12A had higher responses in reduction of TG and fasting insulin respectively. Interestingly, doses below 2.7 g/day (1.8 g/day) were sufficient to induce a significant reduction in fasting insulin and HbA1c% from baseline (P=.019 and P\u3c.001). The observed responses in triglycerides and fasting insulin in the Mexican population give further evidence of the importance of FO supplementation in young people as an early step towards the prevention of cardiometabolic disease.
Trial registration: ClinicalTrials.gov NCT02296385
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