Under the co-promotion of the wave of urbanization and the rise of data science,smart cities have become the new concept and new practice of urban development.Smart cities are the combination of information technology...Under the co-promotion of the wave of urbanization and the rise of data science,smart cities have become the new concept and new practice of urban development.Smart cities are the combination of information technology represented by the Internet of Things,cloud computing,mobile networks and big data,and urbanization.How to effectively achieve the long-term preservation of massive,heterogeneous,and multi-source digital electronic records in smart cities is a key issue thatmust be solved.Digital continuity can ensure the accessibility,integrity and availability of information.The quality management of electronic record,like the quality management of product,will run through every phase of the urban lifecycle.Based on data quality management,this paper constructs digital continuity of smart city electronic records.Furthermore,thework in this paper ensures the authenticity,integrity,availability and timeliness of electronic documents by quality management of electronic record.This paper elaborates on the overall technical architecture of electronic record,as well as the various technical means needed to protect its four characteristics.展开更多
This paper gives a comprehensive introduction of National Cultural Information Resources Sharing Project. It discusses the best practices in creation and long-term preservation of multimedia digital resources, and rec...This paper gives a comprehensive introduction of National Cultural Information Resources Sharing Project. It discusses the best practices in creation and long-term preservation of multimedia digital resources, and recommends solutions to the key issues in resource selection, standards & specifications and copyright.展开更多
National and international publishers have been depositing digital publications at the National Library of the Netherlands (KB) since 2003. Until recently, most of these publications were deposited in the Portable Doc...National and international publishers have been depositing digital publications at the National Library of the Netherlands (KB) since 2003. Until recently, most of these publications were deposited in the Portable Document Format. New projects, for example the Web archiving project, force the KB to handle more heterogeneous material. Therefore, the KB has developed a quantifiable file format risk assessment method. This method can be used to define digital preservation strategies for specific file formats. The choice for a specific file format at creation time or later in the life cycle of a digital object influences the long-term access to the digital object. The evaluation method contains seven sustainability criteria for file formats that are weighed for importance. There seems to be consensus on the sustainability criteria. However, as the weighing of these criteria is connected to an institution's policy, the KB wonders whether agreement on the relative importance of the criteria can be reached at all. With this paper, the KB hopes to inspire other cultural heritage institutions to define their own quantifiable file format evaluation method.展开更多
Because of its commitment to keeping the digital contents accessible, institutional repository plays an important role in the long-term preservation of intellectual output of the institution. However, digital preserva...Because of its commitment to keeping the digital contents accessible, institutional repository plays an important role in the long-term preservation of intellectual output of the institution. However, digital preservation in institutional repository is faced with severe legal issues, especially the intellectual property problems. This paper focuses on the copyright issues involved with long-term preservation of digital resource in institutional repositories. It begins with a brief introduction to the relationship between the institutional repository and digital preservation. Based on this background information, the paper analyzes the related laws and regulations in China that affect the long-term preservation of digital resource in institutional repository. Then the authors discuss in details what kind of the copyright risk there may be, if we realize the long-term preservation of digital resource in institutional repositories. There may be different legal hazards, according to the various types of the digital output collected by institutional repository. The paper ends up with several suggestions to avoid the legal risk in digital preservation of institutional repository. Firstly, to utilize fair use is a feasible way. Secondly, also most safely, is to get the permission from the copyright owner. This is involved in the long-term preservation contract and open license.展开更多
The paper reports a survey on the attitudes,arrangements,and operational model of more than 40 major Chinese libraries(CL)on long-term digital preservation.It reveals that digital preservation becomes an urgent concer...The paper reports a survey on the attitudes,arrangements,and operational model of more than 40 major Chinese libraries(CL)on long-term digital preservation.It reveals that digital preservation becomes an urgent concern for these libraries in our survey.Most of these libraries take a pro-active approach to the issue and most of them are in favor of participation in a certain collaborative preservation system,though a few still remain in a wait-and-see posture.展开更多
Spirulina is an edible algae and has a wide range of pharmaceutical applications in addition to its nutritional value. Isolation and identification of several Spirulina species were conducted in the western part of Me...Spirulina is an edible algae and has a wide range of pharmaceutical applications in addition to its nutritional value. Isolation and identification of several Spirulina species were conducted in the western part of Mexico especially in the state of Jalisco. The purification strategy consisted of five optimized processing steps: 1) washing and centrifugation, 2) chemical treatment, 3) micromanipulation, 4) serial dilution, and 5) plating. Four species were isolated from different locations and two out of these four species were identified taxonomically up to the species level: Spirulina subsalsa and S. major. For short term conservation (30 days), the strains were maintained in liquid and solid agar medium at 10?C and 4?C. For medium term (few months), they were preserved in solid medium under a dried condition as agar flakes and for long term, cryopreservation was employed by using 5% and 10% DMSO, glycerol and methanol as osmoprotectants in liquid nitrogen. For short term preservation nearly 90% liquid and 100% agar recovered strains were viable after one month at both temperatures. In the case of the agar flakes, cells were viable after three months of conservation at room temperature. Cryopreservation did not give any suitable results after three months of conservation. Variable and two-step improved cryopreservation processes are now in progress for conservation.展开更多
Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving marke...Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving market due to their high capacity and low cost. However, in the era of big data, rapidly increasing volume, velocity, and variety of data set bring numerous challenges to the archive systems in various aspects, such as capacity, cost, performance, reliability, power consumption, and so on. In recent years, high capacity optical media, such as bluray discs （BDs） and holographic discs, emerge with the revival of optical storage. Due to the natural simple construction of the optical media, the archive systems based on those optical media, e.g., BD library, demonstrate attractive properties, such as cost per bit, reliability, power consumption, and so on, thus become feasible options in long-term digital preservation. In this paper, we reviewed and compared both the magnetic and optical media based solutions for long-term digital preservation, followed by a summarization on techniques to improve the optical media based archive system.展开更多
As a part of NSTL proposed long-term preservation of digital information network, the National Science Library of CAS (NSLC) constructed a long-term preservation system of electronic journals called CAS E-Journal Arch...As a part of NSTL proposed long-term preservation of digital information network, the National Science Library of CAS (NSLC) constructed a long-term preservation system of electronic journals called CAS E-Journal Archiving System, which was based on OAIS and adapted Fedora as the fundament system. The system chose a certain amount of electronic journals as pilot resources. Through three major system functional components comprising ingest, preservation management and data dissemination, the system took the long-term preservation of digital objects function into practice. The system is designed to be open and scalable. It realized digital objects management and lifecycle management. In this paper we describe the design of the system, and the issues we have learnt about long-term preservation.展开更多
基金the NSFC (Nos. 61772280, 62072249)the AIrecognition scoring system of weather map (No. SYCX202011)+1 种基金the national training programsof innovation and entrepreneurship for undergraduates (Nos. 201910300123Y, 202010300200)the PAPD fund from NUIST. Jinyue Xia is the corresponding author.
文摘Under the co-promotion of the wave of urbanization and the rise of data science,smart cities have become the new concept and new practice of urban development.Smart cities are the combination of information technology represented by the Internet of Things,cloud computing,mobile networks and big data,and urbanization.How to effectively achieve the long-term preservation of massive,heterogeneous,and multi-source digital electronic records in smart cities is a key issue thatmust be solved.Digital continuity can ensure the accessibility,integrity and availability of information.The quality management of electronic record,like the quality management of product,will run through every phase of the urban lifecycle.Based on data quality management,this paper constructs digital continuity of smart city electronic records.Furthermore,thework in this paper ensures the authenticity,integrity,availability and timeliness of electronic documents by quality management of electronic record.This paper elaborates on the overall technical architecture of electronic record,as well as the various technical means needed to protect its four characteristics.
文摘This paper gives a comprehensive introduction of National Cultural Information Resources Sharing Project. It discusses the best practices in creation and long-term preservation of multimedia digital resources, and recommends solutions to the key issues in resource selection, standards & specifications and copyright.
文摘National and international publishers have been depositing digital publications at the National Library of the Netherlands (KB) since 2003. Until recently, most of these publications were deposited in the Portable Document Format. New projects, for example the Web archiving project, force the KB to handle more heterogeneous material. Therefore, the KB has developed a quantifiable file format risk assessment method. This method can be used to define digital preservation strategies for specific file formats. The choice for a specific file format at creation time or later in the life cycle of a digital object influences the long-term access to the digital object. The evaluation method contains seven sustainability criteria for file formats that are weighed for importance. There seems to be consensus on the sustainability criteria. However, as the weighing of these criteria is connected to an institution's policy, the KB wonders whether agreement on the relative importance of the criteria can be reached at all. With this paper, the KB hopes to inspire other cultural heritage institutions to define their own quantifiable file format evaluation method.
文摘Because of its commitment to keeping the digital contents accessible, institutional repository plays an important role in the long-term preservation of intellectual output of the institution. However, digital preservation in institutional repository is faced with severe legal issues, especially the intellectual property problems. This paper focuses on the copyright issues involved with long-term preservation of digital resource in institutional repositories. It begins with a brief introduction to the relationship between the institutional repository and digital preservation. Based on this background information, the paper analyzes the related laws and regulations in China that affect the long-term preservation of digital resource in institutional repository. Then the authors discuss in details what kind of the copyright risk there may be, if we realize the long-term preservation of digital resource in institutional repositories. There may be different legal hazards, according to the various types of the digital output collected by institutional repository. The paper ends up with several suggestions to avoid the legal risk in digital preservation of institutional repository. Firstly, to utilize fair use is a feasible way. Secondly, also most safely, is to get the permission from the copyright owner. This is involved in the long-term preservation contract and open license.
文摘The paper reports a survey on the attitudes,arrangements,and operational model of more than 40 major Chinese libraries(CL)on long-term digital preservation.It reveals that digital preservation becomes an urgent concern for these libraries in our survey.Most of these libraries take a pro-active approach to the issue and most of them are in favor of participation in a certain collaborative preservation system,though a few still remain in a wait-and-see posture.
基金We deeply acknowledge Biotecnologia Mexicana de Mi-croalgas,S.A.and Consejo Nacional de Ciencia y Tec-nologia(CONACYT),Mexico for financial support.
文摘Spirulina is an edible algae and has a wide range of pharmaceutical applications in addition to its nutritional value. Isolation and identification of several Spirulina species were conducted in the western part of Mexico especially in the state of Jalisco. The purification strategy consisted of five optimized processing steps: 1) washing and centrifugation, 2) chemical treatment, 3) micromanipulation, 4) serial dilution, and 5) plating. Four species were isolated from different locations and two out of these four species were identified taxonomically up to the species level: Spirulina subsalsa and S. major. For short term conservation (30 days), the strains were maintained in liquid and solid agar medium at 10?C and 4?C. For medium term (few months), they were preserved in solid medium under a dried condition as agar flakes and for long term, cryopreservation was employed by using 5% and 10% DMSO, glycerol and methanol as osmoprotectants in liquid nitrogen. For short term preservation nearly 90% liquid and 100% agar recovered strains were viable after one month at both temperatures. In the case of the agar flakes, cells were viable after three months of conservation at room temperature. Cryopreservation did not give any suitable results after three months of conservation. Variable and two-step improved cryopreservation processes are now in progress for conservation.
基金This work was supported in part by the National Basic Research Program of China （No. 2011CB302303）, the National High Technology Research and Development Program of China （No. 2013AA013203）, the National Natural Science Foundation of China （Grant No. 60933002）, and the Fundamental Research Funds for Central Universities, Huazhong University of Science and Technology, （No. 2013KXYQ003）. This work was also supported by Key Laboratory of Data Storage System, Ministry of Education.
文摘Long-term digital preservation is an important issue in data storage area. For years, magnetic media based solutions, such as tape and hard disk drive （HDD） based archive systems, monopolize the data archiving market due to their high capacity and low cost. However, in the era of big data, rapidly increasing volume, velocity, and variety of data set bring numerous challenges to the archive systems in various aspects, such as capacity, cost, performance, reliability, power consumption, and so on. In recent years, high capacity optical media, such as bluray discs （BDs） and holographic discs, emerge with the revival of optical storage. Due to the natural simple construction of the optical media, the archive systems based on those optical media, e.g., BD library, demonstrate attractive properties, such as cost per bit, reliability, power consumption, and so on, thus become feasible options in long-term digital preservation. In this paper, we reviewed and compared both the magnetic and optical media based solutions for long-term digital preservation, followed by a summarization on techniques to improve the optical media based archive system.
文摘As a part of NSTL proposed long-term preservation of digital information network, the National Science Library of CAS (NSLC) constructed a long-term preservation system of electronic journals called CAS E-Journal Archiving System, which was based on OAIS and adapted Fedora as the fundament system. The system chose a certain amount of electronic journals as pilot resources. Through three major system functional components comprising ingest, preservation management and data dissemination, the system took the long-term preservation of digital objects function into practice. The system is designed to be open and scalable. It realized digital objects management and lifecycle management. In this paper we describe the design of the system, and the issues we have learnt about long-term preservation.
