Off-line Deduplication Method for Solid-State Disk Based on Hot and Cold Data

Solid-state disk (SSD) deduplication refers to the identification and deletion of duplicate data stored in an SSD. The reliability of SSDs is improved by deduplication. At present, the common data deduplication of SSDs is based on online data deduplication with Field Programmable Gate Array (FPGA) acceleration. The disadvantage is that FPGA, which has a complex structure. An off-line deduplication method for the SSD based on hot and cold data was proposed in this study to simplify the structure of an SSD deduplication, reduce the cost, and improve the efficiency of deduplication and access performance of SSDs. First, the wear-leveling algorithm was employed in the SSD to divide the data into cold and hot. Then, the corresponding fingerprint was generated for the cold data. Second, the fingerprint was compared, and the cold data with the same fingerprint were deleted. Finally, the cold and hot data were exchanged after deduplication. Results demonstrate that the duplicate recognition rate of the proposed method is 5% - 38%, which is close to that of the online deduplication method. In terms of access performance, the performance of SSDs using the proposed method is improved by 20% compared with that of traditional SSDs and is near the access performance of SSDs using online deduplication. This study provides certain reference for improving the reliability of existing SSDs

Defense Technical Information Center thesaurus

This DTIC Thesaurus provides a basic multidisciplinary subject term vocabulary used by DTIC to index and retrieve scientific and technical information from its various data bases and to aid DTIC`s users in their information storage and retrieval operations. It includes an alphabetical posting term display, a hierarchy display, and a Keywork Out of Context (KWOC) display

Active Materials

What is an active material? This book aims to redefine perceptions of the materials that respond to their environment. Through the theory of the structure and functionality of materials found in nature a scientific approach to active materials is first identified. Further interviews with experts from the natural sciences and humanities then seeks to question and redefine this view of materials to create a new definition of active materials

Active Materials

What is an active material? This book aims to redefine perceptions of the materials that respond to their environment. Through the theory of the structure and functionality of materials found in nature a scientific approach to active materials is first identified. Further interviews with experts from the natural sciences and humanities then seeks to question and redefine this view of materials to create a new definition of active materials

Cumulative index to NASA Tech Briefs, 1986-1990, volumes 10-14

Tech Briefs are short announcements of new technology derived from the R&D activities of the National Aeronautics and Space Administration. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This cumulative index of Tech Briefs contains abstracts and four indexes (subject, personal author, originating center, and Tech Brief number) and covers the period 1986 to 1990. The abstract section is organized by the following subject categories: electronic components and circuits, electronic systems, physical sciences, materials, computer programs, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

Diaspora and development? Nigerian organisations in London and their transnational linkages with 'home'

This thesis responds to the rapidly proliferating academic, civil society and policy discourses that posit diasporas as powerful and positive actors in the development of their 'homelands'. These discourses highlight diaspora organisations as key institutions through which international migrants and their descendants contribute to the progress of 'home'. Consequently, these organisations are being lauded as new development actors that should be engaged and supported by governments and international agencies interested in pursuing more direct and participatory modes of development assistance. However, it has been argued that this celebration of diaspora organisations is based on limited knowledge. Drawing on extensive ethnographic fieldwork conducted with London-based Nigerian organisations and their sites of intervention in Nigeria, this thesis makes a contribution to better understanding diaspora organisations and their progressive potential for 'home'. The thesis argues that London-based Nigerian diaspora organisations are not necessarily involved in the development of 'home' to the extent, or in the ways, imagined in celebratory discourses of diaspora and development. These organisations are entwined in the politics of socio-economic status, gender and belonging at 'home' in ways that are profoundly ambivalent in terms of the progressive role expected of them. Furthermore, their monetary, material, intellectual and political contributions to development at 'home' appear relatively limited and rather marginal, especially when compared to those made by local actors. This can be traced to a number of factors that are widely seen to severely constrain collective transnational mobilisation and intervention. Nonetheless, the thesis argues that diaspora organisations have much to contribute to the development of 'home'. However, if states and international agencies are to engage and support diaspora organisations in fulfilling this progressive potential, it will be necessary to engage these groups in more genuine and meaningful dialogue through which alternative, more cosmopolitan visions of belonging and development can be articulated and pursued

Law and Policy for the Quantum Age

Law and Policy for the Quantum Age is for readers interested in the political and business strategies underlying quantum sensing, computing, and communication. This work explains how these quantum technologies work, future national defense and legal landscapes for nations interested in strategic advantage, and paths to profit for companies