469 results about "Lexical analysis" patented technology

An ontology-based parser incorporates both a system and method for converting natural-language text into predicate-argument format that can be easily used by a variety of applications, including search engines, summarization applications, categorization applications, and word processors. The ontology-based parser contains functional components for receiving documents in a plurality of formats, tokenizing them into instances of concepts from an ontology, and assembling the resulting concepts into predicates. The ontological parser has two major functional elements, a sentence lexer and a parser. The sentence lexer takes a sentence and converts it into a sequence of ontological entities that are tagged with part-of-speech information. The parser converts the sequence of ontological entities into predicate structures using a two-stage process that analyzes the grammatical structure of the sentence, and then applies rules to it that bind arguments into predicates.

The invention discloses a query sentence analyzing method based on understanding of natural languages and a system thereof, and belongs to the technical field of information retrieval. The query sentence analyzing method comprises the following steps: (1) automatic segmenting, named entity identification and part-of-speech tagging of an input Chinese query sentence are implemented; (2) syntax structure of the segmented sentence is analyzed so as to obtain a syntax structural tree, and meaning of each word is determined according to the sentence after the part-of-speech tagging; (3) according to the syntax structure and the meaning of each word, semantic roles of predicates in the sentence are tagged; and (4) according to the analyzed result of the sentence from the levels of syntactics, syntax and semantics, keywords are expanded and the keywords that can reflect user information retrieval requirements are extracted. The query sentence analyzing system of the invention comprises a syntactic analyzing module, a syntax analyzing module, a semantic analyzing module and a keyword extracting module. The query sentence analyzing method and system can greatly improve the accuracy of query results and provide desired query results for users.

The invention discloses a testing method based on software defect mode, comprising the steps of: reading source code files of programs to be tested and SDSM description file of a defect state machine, carrying out pre-processing of the programs to be tested, analyzing the SDSM description file; carrying out lexical analysis and grammar analysis of the programs to be tested and constructing abstract syntax tree; generating a control flow graph and a symbol table according to the abstract syntax tree and carrying out the calculating and updating of variable value interval sets according to the control flow graph and the symbol table; carrying out function invoking relation analysis of the programs to be tested and generating a function invoking relation graph; searching the control flow graph by taking the function as unit according to the function invoking relation graph, calculating the state migration of each node defect state machine on the control flow graph, and reporting corresponding checking point when the defect state machine enters the defect state. The invention also discloses a testing system based on software defect mode, which comprises an input module, a defect mode uniformity testing frame and a user interface module and completes the uniform test on the programs to be tested.

The invention provides a method for automatically generating software test cases. The method comprises the following steps of: A. reading to-be-tested software, carrying out lexical analysis, syntax analysis and semantic analysis on a source program of the to-be-tested software and generating an abstract syntax tree and a control flow graph of the to-be-tested software; B. preprocessing the source program of the to-be-tested software by traversing the generated abstract syntax tree, identifying initial input-output variables and compressing the space of a definition domain of the initial input variables; and C. generating a path of program elements of the current to-be-tested software by traversing the control flow graph, carrying out assignment operation, implication operation and backtracking operation on the variables in the path, and generating the test cases. The invention also provides a system for automatically generating software test cases. The method and the system for automatically generating the software test cases can accurately and automatically generate the test cases according to the given program elements of the to-be-tested software and verify the generated test cases, thereby improving the accuracy, efficiency and automation degree of the test cases.

A computer-implemented system and method for translating a SPARQL query. The system includes: a parser/lexer for parsing the SPARQL query; a hidden negative pattern detector for detecting a hidden negative pattern in the parsed SPARQL query; a hidden negative pattern translator for translating the detected hidden negative pattern into an explicit negative pattern; a separator for separating the explicit negative pattern from a positive pattern in the parsed SPARQL query; a negative pattern translator for translating the explicit negative pattern into a negative portion of an SQL statement; a positive pattern translator for translating the positive pattern into a positive portion of the SQL statement; and an SQL statement combiner for combining the negative portion of the SQL statement with the positive portion of the SQL statement.

A voice processing system includes a speech recognition facility with barge-in. The system plays out a prompt to a caller, who starts to provide their spoken response while the prompt is still being played out. The system performs speech recognition on this response to determine a corresponding text, which is then subjected to lexical analysis. This tests whether the text satisfies one or more conditions, for example, including one or more words from a predefined set of task words. If this is found to be the case, the playing out of the prompt is terminated (i.e. barge-in is effected); otherwise, the playing out of the prompt is continued, essentially as if the caller bad not interrupted.

One embodiment of the present invention is a method for lexical analysis of a character stream including: (a) generating one or more parallel property bit streams in response to the character stream; (b) generating one or more lexical item streams in response to the one or more parallel property bit streams; and (c) generating one or more token streams in response to the one or more lexical item streams.

Methods of constructing a document index including named entity information generated by at least one tool associated with parsing computer programs are presented. The methods include using a lexical analyzer generator, e.g. Flex, and/or a parser generator, e.g. Yacc, to generate named entity recognizers. The named entity recognizers are used to identify named entities in documents, in particular, very large document sets such as web pages available on the Internet. The identified named entities are stored as named entity annotations in the document index. Also, methods of performing searches using the document index are presented. The searches are performed based on queries that can be received on an application programming interface (API). Relevant documents are obtained using the named entity annotations, which can be returned across the API. Also presented are associated computer readable media.

Method to prevent the effect of web application injection attacks, such as SQL injection and cross-site scripting (XSS), which are major threats to the security of the Internet. Method using complementary character coding, a new approach to character level dynamic tainting, which allows efficient and precise taint propagation across the boundaries of server components, and also between servers and clients over HTTP. In this approach, each character has two encodings, which can be used to distinguish trusted and untrusted data. Small modifications to the lexical analyzers in components such as the application code interpreter, the database management system, and (optionally) the web browser allow them to become complement aware components, capable of using this alternative character coding scheme to enforce security policies aimed at preventing injection attacks, while continuing to function normally in other respects. This approach overcomes some weaknesses of previous dynamic tainting approaches by offering a precise protection against persistent cross-site scripting attacks, as taint information is maintained when data is passed to a database and later retrieved by the application program. The technique is effective on a group of vulnerable benchmarks and has low overhead.

A system and method for automated conversion of a SAS runtime macro language (RML) program to a target language program such as JAVA. RML macros are identified and converted for inclusion in the RML program. A lexer is applied to generate a stream of tokens, including a token type for ambiguous tokens. A context dependent parsing module, including a token filter to resolve ambiguous tokens, assists the parser in generating an abstract syntax tree (AST), which is modified to express RML specific control flow constructs with target language program elements. The elements of the modified AST are replaced with target language templates from a library, with template parameters filled from the corresponding AST element. A run time library is provided for execution of the target language program.

The invention discloses a generation method of an image description from a structured text. The generation method comprises the steps of downloading pictures from the internet to form a picture training set; conducting morphological analysis on descriptions which correspond to the pictures in the picture training set to form the structured text; using an existing neural network model to extract convolution neural network characteristics of the pictures in the training set, and using <, picture characteristics and structured text < as inputs to form a multitasking recognition model; using the structured text extracted from the training set and a description which corresponds to the structured text as inputs of a recurrent neural network, and conducting training to obtain a parameter of a recurrent neural network model; inputting the convolution neural network characteristics of an image ready to be described, and obtaining a predicted structured text through the multitasking recognition model; inputting the predicted structured text, and obtaining the image description through the recurrent neural network model. Compared with the prior art, a better image description effect, accuracy and sentence variety can be generated through the method, and the generation method of the image description from the structured text can be effectively popularized in an application of image retrieval.

The invention relates to the technical field of man-machine interaction, and discloses an information processing method and device for realizing intelligent question answering. The information processing method comprises the following steps of: carrying out sentence segmentation on question text information to obtain a user question; and searching a standard question most similar to the user question and corresponding answer information from a QA library on the basis of a question similarity. Compared with the existing keyword retrieval-based question answering method, the method disclosed by the invention does not need to require the users to have keyword decomposition ability, is automatic in the whole process and is capable of greatly enhancing the user experience and improving the search effect and the pertinence and effectiveness of answers. Meanwhile, through fusing natural language understanding technologies such as sentence model analysis, lexical analysis and lexical meaning extension, and carrying out comprehensive calculation on multi-dimensional similarity, the method is capable of improving the correctness of a final sentence similarity in a Chinese automatic question answering process, and enabling a Chinese intelligent question answering system to be possible.

A modular parser architecture and methods related thereto make use of a number of miniparsers. Each miniparser is capable of receiving input and generating an output dependent thereon. In one embodiment, a lexer or a miniparser capable of lexical analysis receives certain code and provides an abstract syntax tree. Each miniparser performs operations on a set of syntactical constructs to produce a corresponding output syntax tree, which in turn may become an input syntax tree for a next miniparser which may operate on a different set of syntactical constructs.

This invention opens a method and system of realization of the online advertising,it aims to solve the problem that the network side can not in accordance with the contents of voice to push the advertising issue for the client. The invention includes: A. voice flow through the client side will be transformed into text flow; B. through keyword matching, matching advertising for the described text flow; C. network side will be pushed matching advertisements to the client side for users to browse. This invention system includes: advertising calling module, advertising basement, lexical analysis module, advertising matching module, advertising push module; Aboved system also includes: speech recognition module, whish is used for voice flow gained by advertising calling module transforming into text flow; text flow memory modules for use in storage of text flow of language recognition module output, to prepare for lexical analysis module called. Through the implementation of the invention, we may push corresponding advertising to the client side, basing on the contents of the voice flow between clients altenantly.

The invention provides a method and a device for detecting security flaws of source files. The method includes scanning the source files one by one and executing steps on the scanned source files including subjecting the source files to lexical analysis and grammatical analysis, performing variable identification operation and risk point identification operation in the process of the lexical analysis, wherein the variable identification operation includes identifying variables and storing identified variables; the risk point identification operation includes identifying risk points, backtracking the stored variables by means of parameters of the risk points which are identified, and if the parameters of the risk points can be backtracked to an importable point, considering the risk point is potential risk points to cause security flaws when without security function processing in the process of backtracking. Compared with the prior art, the method for detecting security flaws of the source files has no need to build up an abstract syntax tree, processing procedures are simplified, resources of a testing system are saved, and code scanning efficiency is improved.

The invention relates to a method for detecting SQL (structured query language) injection vulnerability, comprising the following steps: 1, capturing user input data; 2, generating harmless input; 3, carrying out SQL lexical analysis and syntactic analysis to generate SQL syntax trees, wherein the SQL syntax trees comprise a syntax tree based on user input word strings and a syntax tree based on harmless word strings; 4, comparing the two SQL syntax trees, and if the two SQL syntax trees are same, considering a group of testing word strings to pass a test; and 5, responding the result, if a user attempting to carry out SQL injection is found out, blocking an HTTP (hyper text transport protocol) package, and otherwise, releasing the HTTP package. In the method, analyzed objects are input by the user directly or indirectly, thus maximally restoring the real intentions of the user and reducing the rate of false alarm; and meanwhile, based on the analysis of the SQL syntax trees, the SQL injection can be blocked fundamentally, thereby improving the accuracy rate of the detection.

An image of a character string composed of M pieces of characters is clipped from a document image, and the image is divided into separate characters. Image features of each character image are extracted. Based on the image features, N (N>1, integer) pieces of character images in descending order of degree of similarity are selected as candidate characters, from a character image feature dictionary which stores the image features of character image in units of character, and a first index matrix of M×N cells is prepared. A candidate character string composed of a plurality of candidate characters constituting a first column of the first index matrix, is subjected to a lexical analysis according to a language model, and whereby a second index matrix having a character string which makes sense is prepared. In the language model, statistics are taken and then, the lexical analysis is performed.

The invention discloses a memory access abnormity detecting method and a memory access abnormity detecting device. The memory access abnormity detecting method comprises the following steps of checking source codes and analyzing the morphology, the grammar and the semanteme of the source codes to generate a control flow diagram, a data dependence diagram, a first list file and a second list file; establishing a global function invocation diagram of the source codes according to the control flow diagram; performing matching detection on dynamic memory allocation of the source codes according to the global function invocation diagram, the second list file and the data dependence diagram; and establishing a virtual executing platform; and extracting an executing path according to the first list file, the control flow diagram and the data dependence diagram so as to detect memory leakage caused by dynamic memory allocation and memory access violation during running of a program. Memory access abnormity in the source codes can be sufficiently dug by analyzing the first list file, the second list file, the control flow diagram, the data dependence diagram and the global function invocation diagram, establishing the virtual executing platform and extracting the executing path, and the memory access abnormity can be detected efficiently.

The invention provides an intelligent questioning-answering method, a terminal and a storage medium. According to the method, metadata recognition is performed on data information contained in user question information, word segmentation processing, lexical analysis and semantic analysis are sequentially performed on the data information, strings contained in the data information are rearranged according to analysis results, the reset data information obtained after rearrangement is matched with user events stored in a question information knowledge base, a user event record and a question template corresponding to the reset data information are obtained through matching, an answer matched with both the user event record and the question template is queried from an answer base, and the answer is output and displayed. Through the method, source processing is performed on data input by a user, the corresponding answer is acquired according to a unique identifier and the question template, therefore, the more accurate question answer can be acquired, working efficiency is improved, and waiting time of the user is shortened.

A search enhancement system (whether linked through an API to a search engine or integral to a search engine) creates a series of different narrow searches through the selective use of synonyms, hyponyms for a narrower search, hypernyms for a broader search, and antonyms for a reverse search. Lexical analysis can also be used to create alternative narrow searches. This allows a user to explore different nuances of meaning in an original search phrase until the user finds what he or she wants, while keeping individual searches narrow, thus leading to more focused search results.

The invention relates to a search technology and provides a search engine used in personal hand-held equipment and a resource search method to solve the defects, such as inconvenient lookup of page turning caused by excessive search results, and the like. The search engine comprises a lexical analysis module, a search module and a search result sequencing module, wherein the lexical analysis module receives key words, confirms to the type of the key words and sends out the key words, the search module searches a resource containing the key words in a resource pool and generates and sends out search results containing the found-out resource and the applying program name corresponding to the resource; and the search result sequencing module receives the types of the key words and invokes the corresponding weight table. The search results are received and sequenced to generate a first-stage resource list, the weighting corresponding to every applying program in a second applying program list is looked up in the weight table, the second applying program list is sequenced according to the weight, and the sequenced second applying program list is outputted. The invention also provides a resource search method. The search range can be further reduced by carrying out the lexical analysis of the key words to greatly reduce the quantity of the search results.