摘要:
An improved method for stereolithographically making an object by alternating the order in which similar sets of vectors are exposed over two or more layers. In another method, a pattern of tightly packed hexagonal tiles are drawn. Each tile is isolated from its neighboring tiles by specifying breaks of unexposed material between the tiles. Using an interrupted scan method, vectors are drawn with periodic breaks along their lengths. In another method, modulator and scanning techniques are used to reduce exposure problems associated with the acceleration and deceleration of the scanning system when jumping between vectors or changing scanning directions.
摘要:
An improved method for stereolithographically forming a three-dimensional object wherein ordinarily solidified internal walls of the object remain at least partially unsolidified. Any unsolidified medium within the object can be drained from the internal walls of the object prior to post-curing so that a hollow three-dimensional object is formed. The object is formed on a layer by layer basis with the internal portion of each layer of the object formed as a grid of solidified portions and unsolidified portions wherein the solidified and unsolidified portions are different on each layer. Objects formed in this manner can be used as patterns in investment casting.
摘要:
An improved method for stereolithographically making an object by alternating the order in which similar sets of vectors are exposed over two or more layers. In another method, a pattern of tightly packed hexagonal tiles are drawn. Each tile is isolated from its neighboring tiles by specifying breaks of unexposed material between the tiles. Using an interrupted scan method, vectors are drawn with periodic breaks along their lengths. In another method, modulator and scanning techniques are used to reduce exposure problems associated with the acceleration and deceleration of the scanning system when jumping between vectors or changing scanning directions.
摘要:
An improved method for stereolithographically making an object by alternating the order in which similar sets of vectors are exposed over two or more layers. In another method, a pattern of tightly packed hexagonal tiles are drawn. Each tile is isolated from its neighboring tiles by specifying breaks of unexposed material between the tiles. Using an interrupted scan method, vectors are drawn with periodic breaks along their lengths. In another method, modulator and scanning techniques are used to reduce exposure problems associated with the acceleration and deceleration of the scanning system when jumping between vectors or changing scanning directions. In another method, a capability for automatically inserting vents an drains into a three-dimensional object representation is provided.
摘要:
A navigation system utilizes a testing package tailor made for an incremental update to a map database. An incorrect incremental update may corrupt a navigation database. Testing an incrementally updated database after updating allows a corrupted database to be detected before the corrupted database is used by the map database system. Map tiles associated with a list of recompiled objects are used to populate a table. A test script is created from the list map tiles and, when executed, checks the validity of references in the map database associated with the map tiles. The test script generates a return value that indicates whether errors occurred, the type of the errors, the quantity of errors, or any combination thereof. The navigation system analyzes the errors and determines whether to finalize or roll back the update.
摘要:
A method and device offering a software diversity of the cited type for floating-point arithmetic, which is applicable in a realtime environment, wherein the method and a device for high-performance validation of the calculation use floating-point numbers of any accuracy within the context of functional safety in accordance with International Electrotechnical Commission (IEC) standard 61508. The method utilizes a specific form of software diversity and has effects on both the runtime environment and the engineering environment.
摘要:
A method and system for full text search for use during destination selection with a navigation system is disclosed. The method partitions a full text search index based on frequently used terms. These frequently used terms are then mapped to dedicated full text search indexes, where each document contains this frequently used term but the term itself is not stored in the index. A relation maps the frequently used terms to the inverted indexes.
摘要:
A page server and method of using the page server is described. The page server stores versioned pages. The pages, which are equally sized data chunks, can be stored with identifiers and version data in a relational database, in separate files, or in a single file where pages are concatenated. The page server may be accessed via SQL, a web interface, a proprietary key/value/version interface on top of TCP/IP, or other method. The page server facilitates incremental updates.
摘要:
A page server and method of using the page server is described. The page server stores versioned pages. The pages, which are equally sized data chunks, can be stored with identifiers and version data in a relational database, in separate files, or in a single file where pages are concatenated. The page server may be accessed via SQL, a web interface, a proprietary key/value/version interface on top of TCP/IP, or other method. The page server facilitates incremental updates.
摘要:
A method and system for efficiently storing, retrieving, and updating binary large objects (BLOBs) in embedded systems is disclosed. The metadata of the BLOBs is stored in relational tables, while the BLOBs are stored in a flat file. Querying the metadata of the BLOBs (i.e. the starting points of the BLOBs and their length) is performed based on SQL. The corresponding BLOBs are then accessed using file operation commands. To further simplify the querying and storage of BLOBs, virtual tables are created. By using these virtual tables, a user can access a BLOB as if it was stored in a physical table.