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1. 发明申请

US20120150877A1 EFFICIENT DATABASE COMPRESSION 审中-公开
标题翻译：高效的数据库压缩
公开(公告)号：US20120150877A1
公开(公告)日：2012-06-14
申请号：US12964549
申请日：2010-12-09
申请人： Ravishankar Ramamurthy , Abhijeet Mohapatra
发明人： Ravishankar Ramamurthy , Abhijeet Mohapatra
IPC分类号： G06F17/30
CPC分类号： G06F16/20
摘要： A method for compressing data. The method includes accessing, within an electronic system, a database relation comprising a plurality of attributes and determining a sort order of the plurality of attributes of the database relation. The method further includes determining an order of a plurality of compression operators operable to compress the database relation and compressing the database relation to produce a compressed database based on the sort order and the order of the plurality compression operators.
摘要翻译：一种压缩数据的方法。该方法包括在电子系统内访问包括多个属性的数据库关系，并确定数据库关系的多个属性的排序顺序。该方法还包括确定可操作以压缩数据库关系的多个压缩算子的顺序，并且基于多个压缩算子的排序顺序和顺序来压缩数据库关系以产生压缩数据库。

2. 发明授权

US08108154B2 NOx emission estimation systems and methods 有权
标题翻译： NOx排放估算系统和方法
公开(公告)号：US08108154B2
公开(公告)日：2012-01-31
申请号：US12331884
申请日：2008-12-10
申请人： Ravishankar Ramamurthy , Shouxian Ren
发明人： Ravishankar Ramamurthy , Shouxian Ren
IPC分类号： G06N31/00 , F01N3/00
CPC分类号： F01N9/00 , F01N3/2066 , F01N2900/0601 , F01N2900/08 , F01N2900/12 , F01N2900/1402 , Y02A50/2325 , Y02T10/24 , Y02T10/47
摘要： A NOx estimation system includes an operating mode determination module that determines an operating mode of an engine, and an emission prediction module. The emission prediction module estimates NOx emission based on the operating mode, a plurality of sensed parameters, and a map. The map correlates the plurality of sensed parameters to the NOx emission based on the operating mode.
摘要翻译： NOx估计系统包括确定发动机的运行模式的运行模式确定模块和排放预测模块。排放预测模块基于操作模式，多个感测参数和地图来估计NOx排放。该地图基于操作模式将多个感测参数与NOx排放相关联。

3. 发明授权

US07739269B2 Incremental repair of query plans 有权
标题翻译：查询计划的增量修复
公开(公告)号：US07739269B2
公开(公告)日：2010-06-15
申请号：US11625153
申请日：2007-01-19
申请人： Surajit Chaudhuri , Ravishankar Ramamurthy
发明人： Surajit Chaudhuri , Ravishankar Ramamurthy
IPC分类号： G06F7/00 , G06F17/30
CPC分类号： G06F17/30463
摘要： Database systems use a plan cache to avoid the overheads (e.g., time, money) of query recompilation. Query plans can become invalidated by updates to the statistics on data or changes to the physical database design. Once a plan is invalidated, it can be repaired utilizing one or more of the disclosed embodiments. Incremental repair of query plans includes reusing parts of the current plan rather than discarding the plan entirely when it is invalidated. Repair to an existing query plan is attempted before resorting to full recompilation.
摘要翻译：数据库系统使用计划缓存来避免查询重新编译的开销（如时间，金钱）。通过对数据统计信息的更新或物理数据库设计更改，查询计划可能会失效。一旦计划无效，可以利用所公开的一个或多个实施例来修复计划。查询计划的增量修复包括重新使用当前计划的部分，而不是完全在无效的情况下丢弃计划。在进行完全重新编译之前尝试修复现有的查询计划。

4. 发明申请

US20090083238A1 STOP-AND-RESTART STYLE EXECUTION FOR LONG RUNNING DECISION SUPPORT QUERIES 审中-公开
标题翻译：用于长时间运行的决策支持查询的停止和重新启动方式执行
公开(公告)号：US20090083238A1
公开(公告)日：2009-03-26
申请号：US11859046
申请日：2007-09-21
申请人： Surajit Chaudhuri , Shriraghav Kaushik , Abhijit Pol , Ravishankar Ramamurthy
发明人： Surajit Chaudhuri , Shriraghav Kaushik , Abhijit Pol , Ravishankar Ramamurthy
IPC分类号： G06F17/30
CPC分类号： G06F16/24561
摘要： Stop-and-restart query execution that partially leverages the work already performed during the initial execution of the query to reduce the execution time during a restart. The technique selectively saves information from a previous execution of the query so that the overhead associated with restarting the query execution can be bounded. Despite saving only limited information, the disclosed technique substantially reduces the running time of the restarted query. The stop-and-restart query execution technique is constrained to save and reuse only a bounded number of records (intermediate records or output records) thereby releasing all other resources, rather than some of the resources. The technique chooses a subset of the records to save that were found during normal execution and then skipping the corresponding records when performing a scan during restart to prevent the duplication of execution. A skip-scan operator is employed to facilitate the disclosed restart technique.
摘要翻译：停止和重新启动的查询执行，部分利用在初始执行查询期间已经执行的工作，以减少重新启动期间的执行时间。该技术选择性地保存来自查询的先前执行的信息，使得与重新启动查询执行相关联的开销可以被界定。尽管仅节省有限的信息，但是所公开的技术大大减少了重新启动的查询的运行时间。停止和重启查询执行技术被限制为只保存和重用有限数量的记录（中间记录或输出记录），从而释放所有其他资源，而不是一些资源。该技术选择在正常执行期间发现的记录的子集，然后在重新启动期间执行扫描时跳过相应的记录，以防止重复执行。采用跳过扫描运算符来促进公开的重启技术。

5. 发明授权

US06934621B2 Re-entry strategy from boost mode to EGR mode 失效
标题翻译：从升压模式到EGR模式的重新进入策略
公开(公告)号：US06934621B2
公开(公告)日：2005-08-23
申请号：US10627520
申请日：2003-07-25
申请人： Sameer Bhargava , Ravishankar Ramamurthy , Brian A. Lewallen
发明人： Sameer Bhargava , Ravishankar Ramamurthy , Brian A. Lewallen
IPC分类号： F02D21/08 , F02D23/00 , F02D41/00 , F02M25/07 , B60T7/12
CPC分类号： F02D41/005 , F02D41/0007 , F02D2200/0406 , F02D2200/0408 , F02D2200/0414 , F02M26/25 , F02M26/47 , Y02T10/144 , Y02T10/47
摘要： A control for an internal combustion engine that includes an exhaust gas recirculation system predicts at least one of the intake manifold temperature in EGR mode or an intake manifold pressure in EGR mode, but preferably both, during Boost mode operation. The predictions are relied upon to calculate an intake manifold critical temperate in EGR, at which condensation would occur. The control then compares the predicted temperate value with the calculated intake manifold critical temperature, and if the predicted value exceeds the calculated temperature, the control commands re-entry into exhaust gas recirculation mode.
摘要翻译：包括排气再循环系统的内燃机的控制装置在升压模式运行期间预测EGR模式中的进气歧管温度或EGR模式中的进气歧管压力中的至少一个，但优选两者。依靠这些预测来计算在发生冷凝的EGR中的进气歧管临界温度。然后，控制将预测的温度值与计算的进气歧管临界温度进行比较，如果预测值超过计算出的温度，则控制命令重新进入废气再循环模式。

6. 发明授权

US06681171B2 Condensation control for internal combustion engines using EGR 有权
标题翻译：使用EGR的内燃机冷凝控制
公开(公告)号：US06681171B2
公开(公告)日：2004-01-20
申请号：US10023020
申请日：2001-12-18
申请人： Phillip F. Rimnac , Ravishankar Ramamurthy , Sameer Bhargava
发明人： Phillip F. Rimnac , Ravishankar Ramamurthy , Sameer Bhargava
IPC分类号： F02M2507
CPC分类号： F02D41/005 , F01P2060/02 , F02B29/0418 , F02B29/0425 , F02B29/0493 , F02B37/24 , F02D2200/0406 , F02D2200/0414 , F02D2200/0418 , F02M26/05 , F02M26/10 , F02M26/16 , F02M26/25 , F02M26/28 , F02M26/47 , Y02T10/146 , Y02T10/47
摘要： A system and method for controlling an internal combustion engine to reduce or eliminate formation of EGR condensate monitor current ambient and operating conditions to determine whether conditions are favorable for condensation of EGR gases, and control the engine accordingly to avoid condensation, preferably by increasing the intake manifold temperature. The intake manifold temperature may be increased by redirecting some or all of the EGR flow to avoid the EGR cooler. Alternatively, or in combination, some or all of the charge air may be redirected to bypass the charge air cooler and/or redirected from the outlet of the turbocharger compressor to the intake, effectively increasing the intake air temperature and resulting in a corresponding increase of the intake manifold temperature. Conditions favorable for condensation may be determined based on engine speed and load, ambient temperature, manifold pressure, scheduled or actual EGR flow rate and scheduled or actual air/fuel ratio.
摘要翻译：用于控制内燃机以减少或消除形成EGR冷凝物的系统和方法监测当前环境和操作条件以确定条件是否有利于EGR气体的冷凝，并且相应地控制发动机以避免冷凝，优选地通过增加进气歧管温度。进气歧管温度可以通过重定向一些或所有EGR流来避免EGR冷却器而增加。或者或组合地，一些或所有增压空气可以被重定向以绕过增压空气冷却器和/或从涡轮增压器压缩机的出口重新定向到进气口，有效地增加进气温度并导致相应增加进气歧管温度。有利于冷凝的条件可以根据发动机转速和负荷，环境温度，歧管压力，调度或实际EGR流量以及计划或实际空气/燃料比来确定。

7. 发明申请

US20110295833A1 Framework for Testing Query Transformation Rules 有权
标题翻译：查询转换规则测试框架
公开(公告)号：US20110295833A1
公开(公告)日：2011-12-01
申请号：US12789486
申请日：2010-05-28
申请人： Vivek R. Narasayya , Ravishankar Ramamurthy , Hicham G. Elmongui
发明人： Vivek R. Narasayya , Ravishankar Ramamurthy , Hicham G. Elmongui
IPC分类号： G06F17/30
CPC分类号： G06F17/30448 , G06F11/3664 , G06F11/3676
摘要： Described is a test framework for testing transformation rules of query optimizers. Rule patterns obtained as tree structures from a query optimizer are used to generate queries that are used to test the rule optimizer's transformation rules. The test framework tracks which rules are exercised for each query, and also determines the correctness of the transformation rule by comparing the results of the query processing with the rule and without the rule (by turning off the rule). The test framework creates a composite pattern corresponding to two or more rules, such as to test rules in a set (e.g., as pairs). Also described is the efficient execution of a test suite for correctness testing, in which queries of the test suite are selected based upon cost information.
摘要翻译：描述了用于测试查询优化器的转换规则的测试框架。使用从查询优化器获取的树结构的规则模式用于生成用于测试规则优化器转换规则的查询。测试框架跟踪每个查询执行哪些规则，并且通过将查询处理的结果与规则进行比较，并且通过将规则（通过关闭规则）进行比较来确定变换规则的正确性。测试框架创建一个对应于两个或多个规则的复合模式，例如测试集合中的规则（例如，成对）。还描述了用于正确性测试的测试套件的有效执行，其中基于成本信息来选择测试套件的查询。

8. 发明申请

US20090183508A1 TURBOCHARGER PROTECTION SYSTEMS AND METHODS 有权
标题翻译：涡轮增压器保护系统和方法
公开(公告)号：US20090183508A1
公开(公告)日：2009-07-23
申请号：US12043211
申请日：2008-03-06
申请人： Ravishankar Ramamurthy
发明人： Ravishankar Ramamurthy
IPC分类号： F02B33/34 , F02M63/00
CPC分类号： F02D41/0007 , F01N9/002 , F02B39/16 , F02D41/029 , F02D41/1448 , F02D41/221 , F02D2200/703 , F02D2250/26 , Y02T10/144 , Y02T10/40
摘要： A turbocharger protection system for an engine system that includes a particulate filter and a turbocharger comprises a delta pressure estimator that estimates a pressure difference in a particulate filter. A pressure factor estimator module estimates a pressure factor based on the difference and barometric pressure. A fuel limit estimator module protects the turbocharger by selectively limiting fuel injection to the engine based on the pressure factor.
摘要翻译：一种用于包括微粒过滤器和涡轮增压器的发动机系统的涡轮增压器保护系统包括估计微粒过滤器中的压力差的δ压力估计器。压力因子估计器模块基于差异和大气压力估计压力因子。燃料极限估计器模块通过基于压力因子选择性地限制对发动机的燃料喷射来保护涡轮增压器。

9. 发明授权

US07493337B2 Query progress estimation 有权
标题翻译：查询进度估计
公开(公告)号：US07493337B2
公开(公告)日：2009-02-17
申请号：US10813963
申请日：2004-03-31
申请人： Surajit Chaudhuri , Vivek Narasayya , Ravishankar Ramamurthy
发明人： Surajit Chaudhuri , Vivek Narasayya , Ravishankar Ramamurthy
IPC分类号： G06F7/00 , G06F17/00 , G06F17/30
CPC分类号： G06F17/30522 , G06F17/30306 , Y10S707/99932 , Y10S707/99945 , Y10S707/99948
摘要： A query progress indicator that provides an indication to a user of the progress of a query being executed on a database. The indication of the progress of the query allows the user to decide whether the query should be allowed to complete or should be aborted. One method that may be used to estimate the progress of a query that is being executed on a database defines a model of work performed during execution of a query. The total amount of work that will be performed during execution of the query is estimated according to the model. The amount of work performed at a given point during execution of the query is estimated according to the model. The progress of the query is estimated using the estimated amount of work at the given point in time and the estimated total amount of work. This estimated progress of query execution may be provided to the user.
摘要翻译：查询进度指示符，向用户提供在数据库上执行的查询的进度的指示。查询进度的指示允许用户决定是否允许查询完成或应该被中止。可用于估计在数据库上执行的查询的进度的一种方法定义了在查询执行过程中执行的工作模型。根据模型估计执行查询期间执行的总工作量。在执行查询期间在给定点执行的工作量根据模型进行估计。查询的进度使用在给定时间点的估计工作量和估计的总工作量来估计。可以向用户提供该估计的查询执行进度。

10. 发明申请

US20080071785A1 FINE-GRAINED ACCESS CONTROL IN A DATABASE BY PREVENTING INFORMATION LEAKAGE AND REMOVING REDUNDANCY 失效
标题翻译：通过防止信息泄漏和删除冗余来进行数据库中的细粒度访问控制
公开(公告)号：US20080071785A1
公开(公告)日：2008-03-20
申请号：US11468928
申请日：2006-08-31
申请人： Govind Kabra , Ravishankar Ramamurthy , Sundararajarao Sudarshan
发明人： Govind Kabra , Ravishankar Ramamurthy , Sundararajarao Sudarshan
IPC分类号： G06F17/30
CPC分类号： G06F17/30471 , G06F17/30306 , G06F21/6227
摘要： Fine-grained access control for querying a database with low overhead and safety plans. In a view placement approach, base relations of the query expression are replaced by views that are appropriate for the particular user. Information leakage via UDF pushing, exception processing, and error messages can be prevented by generating safe plans. An existing query optimizer can be modified to perform redundancy removal and safe plan implementation. Subsumption testing available in materialized view matching can be exploited by the query optimizer. Authorization inference is exploited to generate safe plans.
摘要翻译：用于以低开销和安全计划查询数据库的细粒度访问控制。在视图放置方法中，查询表达式的基础关系被替换为适合特定用户的视图。可以通过生成安全计划来防止通过UDF推送，异常处理和错误消息的信息泄漏。可以修改现有的查询优化器，以执行冗余删除和安全计划实施。查询优化器可以利用实体化视图匹配中的可用度量测试。利用授权推理来制定安全计划。

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