The NASA Astrophysics Data System: Data Holdings

Since its inception in 1993, the ADS Abstract Service has become an indispensable research tool for astronomers and astrophysicists worldwide. In those seven years, much effort has been directed toward improving both the quantity and the quality of references in the database. From the original database of approximately 160,000 astronomy abstracts, our dataset has grown almost tenfold to approximately 1.5 million references covering astronomy, astrophysics, planetary sciences, physics, optics, and engineering. We collect and standardize data from approximately 200 journals and present the resulting information in a uniform, coherent manner. With the cooperation of journal publishers worldwide, we have been able to place scans of full journal articles on-line back to the first volumes of many astronomical journals, and we are able to link to current version of articles, abstracts, and datasets for essentially all of the current astronomy literature. The trend toward electronic publishing in the field, the use of electronic submission of abstracts for journal articles and conference proceedings, and the increasingly prominent use of the World Wide Web to disseminate information have enabled the ADS to build a database unparalleled in other disciplines. The ADS can be accessed at http://adswww.harvard.eduComment: 24 pages, 1 figure, 6 tables, 3 appendice

電腦與香港法律研究

published_or_final_versio

Quo vadimus? The 21st Century and multimedia

The concept is related of computer driven multimedia to the NASA Scientific and Technical Information Program (STIP). Multimedia is defined here as computer integration and output of text, animation, audio, video, and graphics. Multimedia is the stage of computer based information that allows access to experience. The concepts are also drawn in of hypermedia, intermedia, interactive multimedia, hypertext, imaging, cyberspace, and virtual reality. Examples of these technology developments are given for NASA, private industry, and academia. Examples of concurrent technology developments and implementations are given to show how these technologies, along with multimedia, have put us at the threshold of the 21st century. The STI Program sees multimedia as an opportunity for revolutionizing the way STI is managed

Handwritten Document Image Retrieval

Ph.DDOCTOR OF PHILOSOPH

Knowledge-based document retrieval with application to TEXPROS

Document retrieval in an information system is most often accomplished through keyword search. The common technique behind keyword search is indexing. The major drawback of such a search technique is its lack of effectiveness and accuracy. It is very common in a typical keyword search over the Internet to identify hundreds or even thousands of records as the potentially desired records. However, often few of them are relevant to users\u27 interests. This dissertation presents knowledge-based document retrieval architecture with application to TEXPROS. The architecture is based on a dual document model that consists of a document type hierarchy and, a folder organization. Using the knowledge collected during document filing, the search space can be narrowed down significantly. Combining the classical text-based retrieval methods with the knowledge-based retrieval can improve tremendously both search efficiency and effectiveness. With the proposed predicate-based query language, users can more precisely and accurately specify the search criteria and their knowledge about the documents to be retrieved. To assist users formulate a query, a guided search is presented as part of an intelligent user interface. Supported by an intelligent question generator, an inference engine, a question base, and a predicate-based query composer, the guided search collects the most important information known to the user to retrieve the documents that satisfy users\u27 particular interests. A knowledge-based query processing and search engine is presented as the core component in this architecture. Algorithms are developed for the search engine to effectively and efficiently retrieve the documents that match the query. Cache is introduced to speed up the process of query refinement. Theoretical proof and performance analysis are performed to prove the efficiency and effectiveness of this knowledge-based document retrieval approach

Customs, Immigration, and Rights: Constitutional Limits on Electronic Border Searches

The warrantless search of travelers’ electronic devices as they enter and exit the United States is rapidly increasing. While the Supreme Court has long recognized a border-search exception to the Fourth Amendment’s warrant requirement, it applies to only two interests: promoting the duty regime and preventing contraband from entering the country; and ensuring that individuals are legally admitted. The government’s recent use of the exception goes substantially beyond these matters. U.S. Customs and Border Protection (CBP) and Immigration and Customs Enforcement (ICE) are using it to search electronic devices, and at times the cloud, for evidence of any criminal activity, bypassing the warrant requirement altogether. Searches of these devices implicate privacy concerns well beyond those of the home, which has long been protected even for customs and immigration purposes. This Essay traces the evolution of the border exception, noting the effect of recent Supreme Court decisions, to argue that CBP and ICE are operating outside constitutional constraints. The Essay considers two objections grounded in the legitimate interests of CBP and ICE. It responds, first, that inspection of digital devices differs from the examination of a traveler’s purse or luggage: the level of intrusion and the amount of information obtained changes the quality of the search, triggering Fourth Amendment protections. Second, as an immigration matter, as soon as citizens are identified, absent probable cause, the government does not have the constitutional authority to search their devices at all. Foreigners lacking a substantial connection to the country, however, do not enjoy the same Fourth Amendment protections. It concludes by observing that because of the substance and complexity of the issue, Congress has an important role to play in determining what types of searches are justified

Word grouping in imaged documents using voronoi tessellation

Master'sMASTER OF SCIENC

A word image coding technique and its applications in information retrieval from imaged documents

Master'sMASTER OF SCIENC

Extraction of textual information from image for information retrieval

Ph.DDOCTOR OF PHILOSOPH