SRAM （Static RAM）-based FPGAs （Field Programmable Gate Arrays （FPGAs） have gained wide acceptance due to their on-line reconfigurable features. The growing demand for FPGAs has motivated semiconductor chip manufa...SRAM （Static RAM）-based FPGAs （Field Programmable Gate Arrays （FPGAs） have gained wide acceptance due to their on-line reconfigurable features. The growing demand for FPGAs has motivated semiconductor chip manufacturers to build more densely packed FPGAs with higher logic capacity. The downside of high density devices is that the probability of errors in such devices tends to increase. This paper proposes an FPGA architecture that is composed of an array of cells with built in error correction capability. Collectively a group of such cells can implement any logic function that is either registered or combinational. A cell is composed of three units： a logic block, a fault-tolerant address generator and a director unit. The logic block uses a look-up table to implement logic functions. The fault-tolerant address generator corrects any single bit error in the incoming data to the functional cell. The director block can transmit output data from the logic block to another cell located at its South, North, East or West, or to cells in all four directions. Thus a functional cell can also be used to route signals to other functional cells, thus avoiding any intricate network of interconnects, switching boxes, or routers commonly found in commercially available FPGAs.展开更多
CM （contelat management） is a strategic discipline that should support the information assets of a company. Although there are some technological instruments structuring this work, the methods that have been used mu...CM （contelat management） is a strategic discipline that should support the information assets of a company. Although there are some technological instruments structuring this work, the methods that have been used must have improvement to a better use. In this sense, IA （information architecture）, as a process that helps users to manage and find information, can collaborate with the organization of this assets allowing the best identification and categorization of information, as well as providing improvements in the website navigation in Intranets and Internet. This article introduces part of a research that deals with the use of IA for developing and structuring the project of Dataprev about the content management for Brazilian social security system.展开更多
This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering sca...This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering scaffold for tissue or organ repairing. In this study, SEM was used to observe the morphology. Biocompatibility was tested by cell culture with the extracted fluid of composite materials. Different proportional scaffolds could be obtained with different concentrations and alcoholysis degree of PVA. Different proportional scaffolds also had different porous structures. SEM proved that large amount of porous structure could be formed. Biocompatibility test showed that the extracted fluid of composite materials was nontoxic, which could promote the adhesion and proliferation of the fibroblast. Fibroblast could grow on the scaffold normally.A porous scaffold for tissue engineering with high water content can be fabricated by PVA, GAG and COL, which has excellent cell biocompatibility. The porous structure shows potential in tissue engineering and cell culture.展开更多
基金Acknowledgement The first author was supported in part by the National Science Foundation, USA under Grant 0925080.
文摘SRAM （Static RAM）-based FPGAs （Field Programmable Gate Arrays （FPGAs） have gained wide acceptance due to their on-line reconfigurable features. The growing demand for FPGAs has motivated semiconductor chip manufacturers to build more densely packed FPGAs with higher logic capacity. The downside of high density devices is that the probability of errors in such devices tends to increase. This paper proposes an FPGA architecture that is composed of an array of cells with built in error correction capability. Collectively a group of such cells can implement any logic function that is either registered or combinational. A cell is composed of three units： a logic block, a fault-tolerant address generator and a director unit. The logic block uses a look-up table to implement logic functions. The fault-tolerant address generator corrects any single bit error in the incoming data to the functional cell. The director block can transmit output data from the logic block to another cell located at its South, North, East or West, or to cells in all four directions. Thus a functional cell can also be used to route signals to other functional cells, thus avoiding any intricate network of interconnects, switching boxes, or routers commonly found in commercially available FPGAs.
文摘CM （contelat management） is a strategic discipline that should support the information assets of a company. Although there are some technological instruments structuring this work, the methods that have been used must have improvement to a better use. In this sense, IA （information architecture）, as a process that helps users to manage and find information, can collaborate with the organization of this assets allowing the best identification and categorization of information, as well as providing improvements in the website navigation in Intranets and Internet. This article introduces part of a research that deals with the use of IA for developing and structuring the project of Dataprev about the content management for Brazilian social security system.
基金National High-tech Reasearch and Development Program of China(863 Program)grant number:2077AA09Z436+1 种基金Guangdong Project '211'grant number:50621030
文摘This paper aims to prepare a PVA-GAG-COL composite with polyvinyl alcohol (PVA), glycosaminoglycan (GAG) and collagen (COL) by the method of freeze drying and to investigate the feasibility as a tissue engineering scaffold for tissue or organ repairing. In this study, SEM was used to observe the morphology. Biocompatibility was tested by cell culture with the extracted fluid of composite materials. Different proportional scaffolds could be obtained with different concentrations and alcoholysis degree of PVA. Different proportional scaffolds also had different porous structures. SEM proved that large amount of porous structure could be formed. Biocompatibility test showed that the extracted fluid of composite materials was nontoxic, which could promote the adhesion and proliferation of the fibroblast. Fibroblast could grow on the scaffold normally.A porous scaffold for tissue engineering with high water content can be fabricated by PVA, GAG and COL, which has excellent cell biocompatibility. The porous structure shows potential in tissue engineering and cell culture.
