AVirtual Cloud Storage Architecture for Enhanced Data Security

The sensitive data stored in the public cloud by privileged users,such as corporate companies and government agencies are highly vulnerable in the hands of cloud providers and hackers.The proposed Virtual Cloud Storage Archi-tecture is primarily concerned with data integrity and confidentiality,as well as availability.To provide confidentiality and availability,thefile to be stored in cloud storage should be encrypted using an auto-generated key and then encoded into distinct chunks.Hashing the encoded chunks ensured thefile integrity,and a newly proposed Circular Shift Chunk Allocation technique was used to determine the order of chunk storage.Thefile could be retrieved by performing the opera-tions in reverse.Using the regenerating code,the model could regenerate the missing and corrupted chunks from the cloud.The proposed architecture adds an extra layer of security while maintaining a reasonable response time and sto-rage capacity.Experimental results analysis show that the proposed model has been tested with storage space and response time for storage and retrieval.The VCSA model consumes 1.5x(150%)storage space.It was found that total storage required for the VCSA model is very low when compared with 2x Replication and completely satisfies the CIA model.The response time VCSA model was tested with different sizedfiles starting from 2 to 16 MB.The response time for storing and retrieving a 2 MBfile is 4.96 and 3.77 s respectively,and for a 16 MBfile,the response times are 11.06 s for storage and 5.6 s for retrieval.

Virtual reconfigurable architecture for evolving combinational logic circuits

A virtual reconfigurable architecture(VRA)-based evolvable hardware is proposed for automatic synthesis of combinational logic circuits at gate-level.The proposed VRA is implemented by a Celoxica RC1000 peripheral component interconnect(PCI)board with an Xilinx Virtex xcv2000E field programmable gate array(FPGA).To improve the quality of the evolved circuits,the VRA works through a two-stage evolution: finding a functional circuit and minimizing the number of logic gates used in a feasible circuit.To optimize the algorithm performance in the two-stage evolutionary process and set free the user from the time-consuming process of mutation parameter tuning,a self-adaptive mutation rate control(SAMRC)scheme is introduced.In the evolutionary process,the mutation rate control parameters are encoded as additional genes in the chromosome and also undergo evolutionary operations.The efficiency of the proposed methodology is tested with the evolutions of a 4-bit even parity function,a 2-bit multiplier,and a 3-bit multiplier.The obtained results demonstrate that our scheme improves the evolutionary design of combinational logic circuits in terms of quality of the evolved circuit as well as the computational effort,when compared to the existing evolvable hardware approaches.

The Architecture and Operation Mode of Virtual Supply Chain

Virtual supply chain, as a modern collaborative mode of enterprises, is important to decrease the cost and improve the efficiency and the quality of supply chains, and to satisfy customers. Based on the analysis of the conception and characteristics of the virtual supply chain, the architecture of virtual supply chain is built, and corresponding objects, tasks, information and technologies are described. Three operation modes-Order-driven, manufacturer-centered, and retailer-centered are researched. As a case, virtual supply chain is applied in the electronic commerce and networked customization system of ceramic products.

Seventeenth-century Seville houses:a survey by the Alarife Juan De Legarra(1637)

Despite the wealth of preserved information,research on the domestic architecture of Seville has been limited.Much of this historical data is available in survey books that were formally compiled in Seville from the Modern Age onwards.These books had detailed descriptions and sometimes illustrations provided by surveyors who were commissioned by owners or tenants.The intention of this study is to illustrate that the information contained in building surveys goes beyond simple descriptions or measurements often accompanied by drawings.They are a comprehensive account that,even centuries later,help reconstruct the architecture,material culture and everyday life that no longer exist.Our research contributes to the understanding of the domestic architectural history of Seville by focusing on one specific survey(a collection of drawings and a written description)extracted from the Hospital de las Cinco Llagas Collection,which is found in the Seville Provincial Council Archive.At least one of the drawings and the written survey can be attributed to the Alarife(architect or master builder)Juan de Legarra,who signed them in 1637.This research explores the architectural development of the city,offering fresh insights into its architecture,heritage,and history.It supplements existing historical,visual,and written records derived from prior studies with a meticulously curated bibliography.Additionally,it uses visualisation techniques to reconstruct buildings,augmenting the research.This endeavour has yielded anticipated benefits,particularly in facilitating visual analysis.The surveys have proven to be invaluable for historical inquiry,yielding unexpected insights through the thorough analysis of both written and graphic sources which serve as a basis for hypothetical construction plans due to their detailed descriptions.Furthermore,this study has contributed to enriching both historical and architectural terminology.The incorporation of digital technologies into this architectural context allows us to expand our knowledge through the exhaustive compilation of building records.It also facilitates in-depth analysis of architecture,which could result in an up-to-date architectural catalogue that would stimulate interest in preserving a legacy that,until recently,was at risk of being lost.