Papers by David Silberberg
The StarView interface is being developed to facilitate the retrieval of scientific and
NASA, Washington, Second Annual Conference on Astronomical Data Analysis Software and Systems. Abstracts, 1992
The StarView interface is being developed to facilitate the retrieval of scientific and
The StarView interface is being developed to facilitate the retrieval of scientific and
KRDB, 1998
We are developing a system known as QUICK (for QUICK is a Universal Interface with Conceptual Kno... more We are developing a system known as QUICK (for QUICK is a Universal Interface with Conceptual Knowledge) which provides simplified access to database systems.
NASA, Washington, Second Annual Conference on Astronomical Data Analysis Software and Systems. Abstracts, 1992
... databases. For example, consider a request over the ARL-ELINT database to list the pulse repe... more ... databases. For example, consider a request over the ARL-ELINT database to list the pulse repetition frequency, the radio frequency, and the pulse width of electronic deviceABC1234: SELECT prf, rf, pw WHERE elnot_id = 'ABC1234' ...
KRDB, 1998
We are developing a system known as QUICK (for QUICK is a Universal Interface with Conceptual Kno... more We are developing a system known as QUICK (for QUICK is a Universal Interface with Conceptual Knowledge) which provides simplified access to database systems.
Telematics and Informatics, Jun 1, 1993
StarView interface is being developed to facilitate the retrieval of scientific and engineering d... more StarView interface is being developed to facilitate the retrieval of scientific and engineering data produced by the Hubble Space Telescope. While predefined screens in the interface can be used to specify many common requests, ad hoc requests require a dynamic query formulation capability. Unfortunately, logical level knowledge is too sparse to support this capability. In particular, essential formulation knowledge is lost when the domain of interest is mapped to a set of database relation schemas. Thus, a system known as QUICK has been developed that uses extended entity-relationship design knowledge to facilitate query formulation. By heuristically determining strongly associated objects at the conceptual level, QUICK is able to formulate semantically reasonable queries in response to high-level requests that specify only attributes of interest. Moreover, by exploiting constraint knowledge in the conceptual design, QUICK assures that queries are formulated quickly and will execute efficiently.
... databases. For example, consider a request over the ARL-ELINT database to list the pulse repe... more ... databases. For example, consider a request over the ARL-ELINT database to list the pulse repetition frequency, the radio frequency, and the pulse width of electronic deviceABC1234: SELECT prf, rf, pw WHERE elnot_id = 'ABC1234' ...
World Scientific Publishing Company eBooks, Dec 1, 2001
Current data storage, retrieval, and management mechanisms are inherently complex, perpetuating t... more Current data storage, retrieval, and management mechanisms are inherently complex, perpetuating the need for intuitive access to stored data. The Internet has complicated the situation further by vastly increasing the quantity, types, and availability of data. In a distributed environment, data storage, retrieval, and management must coordinate among multiple heterogeneous sources. In this article, we present approaches to simplifying access to data sources. We begin by presenting automated query generation as a means to provide high-level access to a single database. We then present an overview of architectures that support the interoperability of multiple distributed heterogeneous data sources, including an architecture which generalizes an automated query formulation technique to support multiple distributed heterogeneous sources. We conclude by discussing the role of distributed object and agent technologies in distributed information access.
Telematics and Informatics, Jun 1, 1993
StarView interface is being developed to facilitate the retrieval of scientific and engineering d... more StarView interface is being developed to facilitate the retrieval of scientific and engineering data produced by the Hubble Space Telescope. While predefined screens in the interface can be used to specify many common requests, ad hoc requests require a dynamic query formulation capability. Unfortunately, logical level knowledge is too sparse to support this capability. In particular, essential formulation knowledge is lost when the domain of interest is mapped to a set of database relation schemas. Thus, a system known as QUICK has been developed that uses extended entity-relationship design knowledge to facilitate query formulation. By heuristically determining strongly associated objects at the conceptual level, QUICK is able to formulate semantically reasonable queries in response to high-level requests that specify only attributes of interest. Moreover, by exploiting constraint knowledge in the conceptual design, QUICK assures that queries are formulated quickly and will execute efficiently.
Innovative Applications of Artificial Intelligence, Aug 4, 1996
The NASA Personnel Security Processing Expert System is a tool that automatically determines the ... more The NASA Personnel Security Processing Expert System is a tool that automatically determines the appropriate personnel background investigation required for a civil servant or contractor occupying a position of national security or public trust. It also instructs the personnel security processing staff to perform special checks based on a specific position. The system is implemented using a rule-based expert system and a World Wide Web interface. The system design separates the user interface, knowledge base and control structure to simplify system evolution. When one subsystem is modified, the others are impacted minimally. This system provides many benefits to the NASA Personnel Security Program. First, it frees the agency personnel security specialist from troubleshooting and correcting all investigative problems. It also provides a learning tool for security processing staff at each installation. The system ensures that each installation security office is in compliance with all applicable laws, regulations and policies. Finally, eliminating overlapping, inappropriate and duplicative efforts to process employees saves many resources. The system was deployed less than a year ago. To date, it saved $1.2 million of the $1.5 million agency wide personnel security budget.
World Scientific Publishing Company eBooks, Dec 1, 2001
Current data storage, retrieval, and management mechanisms are inherently complex, perpetuating t... more Current data storage, retrieval, and management mechanisms are inherently complex, perpetuating the need for intuitive access to stored data. The Internet has complicated the situation further by vastly increasing the quantity, types, and availability of data. In a distributed environment, data storage, retrieval, and management must coordinate among multiple heterogeneous sources. In this article, we present approaches to simplifying access to data sources. We begin by presenting automated query generation as a means to provide high-level access to a single database. We then present an overview of architectures that support the interoperability of multiple distributed heterogeneous data sources, including an architecture which generalizes an automated query formulation technique to support multiple distributed heterogeneous sources. We conclude by discussing the role of distributed object and agent technologies in distributed information access.
AGUFM, Dec 1, 2002
ABSTRACT In recent years, there has been a proliferation of scientific resources, including data ... more ABSTRACT In recent years, there has been a proliferation of scientific resources, including data repositories and analysis tools, available to solar and space physicists for research use. As the Living With a Star satellites begin to collect data and as more analysis tools are created, the data and analysis environment will become increasingly complex. Currently, scientists visit multiple sites and use general-purpose search engines to locate and retrieve data and analysis tools. While this approach currently works within a discipline, as the quantity of data and tools increase, this method of search and retrieval will become increasingly inadequate for both inter-disciplinary and intra-disciplinary research. Data and tool providers may also find it difficult to identify and supply their resources, particularly when supporting multiple scientific disciplines, data formats, and resource sites. At the Johns Hopkins University Applied Physics Laboratory, we are developing a prototype Scientific Resource Access System (SRAS) to allow scientists to discover and access multiple distributed scientific resources from a single interface. In addition, it enables resource providers to identify and make available their resources with a minimum of effort, without having to convert or upload the data. The SRAS will provide a simple and complete method to allow the space science community to gather and share valuable data and analysis tools.
Innovative Applications of Artificial Intelligence, Aug 4, 1996
The NASA Personnel Security Processing Expert System is a tool that automatically determines the ... more The NASA Personnel Security Processing Expert System is a tool that automatically determines the appropriate personnel background investigation required for a civil servant or contractor occupying a position of national security or public trust. It also instructs the personnel security processing staff to perform special checks based on a specific position. The system is implemented using a rule-based expert system and a World Wide Web interface. The system design separates the user interface, knowledge base and control structure to simplify system evolution. When one subsystem is modified, the others are impacted minimally. This system provides many benefits to the NASA Personnel Security Program. First, it frees the agency personnel security specialist from troubleshooting and correcting all investigative problems. It also provides a learning tool for security processing staff at each installation. The system ensures that each installation security office is in compliance with all applicable laws, regulations and policies. Finally, eliminating overlapping, inappropriate and duplicative efforts to process employees saves many resources. The system was deployed less than a year ago. To date, it saved $1.2 million of the $1.5 million agency wide personnel security budget.
We are developing a distributed user interface to the Space Telescope Data Archive and Distributi... more We are developing a distributed user interface to the Space Telescope Data Archive and Distribution Service (DADS) known as StarView. The DADS architecture consists of the data archive as well as a relational database catalog describing the archived data. Users query the DADS catalog via StarView forms. Based on the results, users decide which data sets to retrieve from the
AGUFM, Dec 1, 2002
ABSTRACT In recent years, there has been a proliferation of scientific resources, including data ... more ABSTRACT In recent years, there has been a proliferation of scientific resources, including data repositories and analysis tools, available to solar and space physicists for research use. As the Living With a Star satellites begin to collect data and as more analysis tools are created, the data and analysis environment will become increasingly complex. Currently, scientists visit multiple sites and use general-purpose search engines to locate and retrieve data and analysis tools. While this approach currently works within a discipline, as the quantity of data and tools increase, this method of search and retrieval will become increasingly inadequate for both inter-disciplinary and intra-disciplinary research. Data and tool providers may also find it difficult to identify and supply their resources, particularly when supporting multiple scientific disciplines, data formats, and resource sites. At the Johns Hopkins University Applied Physics Laboratory, we are developing a prototype Scientific Resource Access System (SRAS) to allow scientists to discover and access multiple distributed scientific resources from a single interface. In addition, it enables resource providers to identify and make available their resources with a minimum of effort, without having to convert or upload the data. The SRAS will provide a simple and complete method to allow the space science community to gather and share valuable data and analysis tools.
Nucleation and Atmospheric Aerosols, 1993
The Hubble Space Telescope (HST) and ground system produce data sets that are archived onto an op... more The Hubble Space Telescope (HST) and ground system produce data sets that are archived onto an optical disk juke‐box system. A smaller HST Catalog exists to describe and manage access to the archived data. Users request data sets via keyword searches of the Catalog. The searches return pointers to corresponding archived file names.The HST Catalog is populated by data from several external databases via the Ingest program. The topologies of the external databases and the Catalog are inherently different because they were designed to maximize utility in their own contexts. Therefore, when importing data, Ingest normalizes and/or joins rows of multiple external database tables and writes the new rows to the Catalog. Secondarily, Ingest parses data values, translates data values, and creates row identifiers for each row to be written to the Catalog. The Ingest process is driven by translation tables residing in the Catalog database and are alterable on‐the‐fly.Ingest has proven to be a powerful tool in the HS...
We are developing a distributed user interface to the Space Telescope Data Archive and Distributi... more We are developing a distributed user interface to the Space Telescope Data Archive and Distribution Service (DADS) known as StarView. The DADS architecture consists of the data archive as well as a relational database catalog describing the archived data. Users query the DADS catalog via StarView forms. Based on the results, users decide which data sets to retrieve from the
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Papers by David Silberberg